JPWO2019198354A1 - Reservoir comprehensive decontamination method including environmental measures - Google Patents

Abstract

PROBLEM TO BE SOLVED: To track mud-smooth soft soil by an endless track in a decontamination work of a soil layer such as a rainwater regulating pond in which the soil or the like is highly contaminated by rainwater drainage containing radioactive substances. Pollution that does not cause soiling problems even if excavation work is carried out using vehicles, and that the bottom of the pond is pulled out by removing the support piles that have been placed and the original function of the regulating pond etc. is not exerted. Providing excavation methods for soil layers. SOLUTION: This method includes a support pile driving step for driving support piles, a floorboard laying step for laying a floorboard, an excavation step, a floorboard removal step, an excavation step after floorboard removal, and a pile head cutting step. The process is to construct a transportation route for a tracked vehicle by repeating a series of steps in which a tracked vehicle conveys the next floored plate on a laid plate and performs continuous construction, and the support pile driving process. In the excavation process, excavation is performed while removing the floor plate, and in the pile head cutting process, a means for cutting the pile head according to the excavated surface after the excavation is adopted. [Selection diagram] Figure 1

Description

  The present invention relates to a method for removing contaminated soil in a pond, and in detail, in decontamination work such as a regulating pond, in a soft land portion where water is drawn, it is possible to prevent stirring of soil by an endless track of a tracked vehicle, Basically, the method of excavating contaminated soil layers is used to perform typical excavation work.At a water pool where water is accumulated, the agitation method that sucks the bottom mud accumulated in the bottom and separates and collects the bottom mud The present invention relates to a reservoir pond comprehensive decontamination method in which a stirring and peeling type suction method utilizing a stirring and peeling type suction system using a suction device can be used.

  Due to the Tohoku-Pacific Ocean Earthquake that occurred on March 11, 2011, TEPCO's Fukushima Daiichi Nuclear Power Station was damaged, and a large amount of radioactive material was released into the environment. There is concern about environmental pollution due to radioactive substances and the resulting effects on human health or the living environment, and it is an urgent task to reduce these effects promptly. Adjustment ponds, reservoirs, etc. temporarily store rainwater flowing into rivers due to localized floods such as heavy rainfall, reduce the burden on downstream rivers and sewer rainwater pipes, or are agricultural irrigation facilities, Before that, it was thought that the radiation dose in the regulating ponds and reservoirs would not have a direct impact on the lives of citizens because the facilities were controlled by fences, etc. so that ordinary people could not enter.

However, in the rainwater control pond where rainwater drainage collects, soil and fallen leaves are accumulated, so radioactive substances are concentrated (accumulated) there, and high concentrations of radioactive substances are observed. As announced by many local governments, there are some cases where the radiation dose measurement results of rainwater control ponds, storage ponds, sewer control ponds, etc. greatly exceed the radiation dose prescribed by each local government. As of the time it was enacted, there are many cases where regulating ponds are also recognized as locally contaminated areas.
Such adjustment ponds are soft, eutrophic humus soils that are muddy, and because they contain a large amount of water, when a tracked vehicle such as a backhoe is brought in to excavate the soil, the soil is mixed in a track. The situation occurs. In addition, a large number of piles will have to be placed prior to laying a floor plate such as an iron plate.However, if the piles are to be removed after decontamination in order to remove them, the bottom of the pond will be pulled out, and the functions of the adjustment pond, etc. will be removed. There is a problem that it will not work.

  Therefore, conventionally, various techniques have been proposed in order to solve the problem. Specifically, for example, a technology in which the title of the invention is “decontamination apparatus and method for decontaminating contaminated soil” is disclosed and is a known technology (see Patent Document 1). `` The challenge is to make it easy to install and remove with a simple structure, to make the decontamination work unattended, and to expand the decontamination target range of contaminated soil to the deep soil layer. An electrode sheet laid on the surface, a plurality of electrode piles 3 that penetrate the electrode sheet and are inserted into the soil in the decontamination target area, a penetrant liquid that permeates into the contaminated soil, and a stopper that stops the diffusion of the permeate liquid in the contaminated soil. The electrode sheet contains a conductive material and a pollutant adsorbent or a pollutant decomposer.The electrode pile communicates with the injection port and the discharge port, and the upper end bolt terminal is connected to the tip electrode part. It is electrically conductive and has an insulating coating on the side surface except the tip. A pressing piece for pressing the electrode sheet through a rubber bush is projected on the upper end of the insulating coating to provide a bolt terminal. DC voltage is applied between the piles and the penetrant diffuses And the contaminant contaminated soil to attract the electrokinetic phenomenon electrode sheet. "Is that. However, Patent Document 1 describes a method for decontaminating contaminated soil, and by removing the sheet-shaped electrode member, radioactive materials can be collected. Although common in that there is no agitation / mixing, cesium has a high ionization tendency, so it is unlikely that it exists as a cesium simple substance in the environment, and as a compound it adheres to soil, trees, various structures, etc. The amount of soil that can be adsorbed on the electrode sheet for adsorbing on the electrode member is small, and removing the electrode pile may cause the bottom of the pond to be removed. Therefore, it is considered that the present invention is not suitable for decontamination of polluted soil in an empty pond.

  Further, a technology in which the name of the invention is “topsoil transplanting method and topsoil stripping mechanism” is disclosed and is a publicly known technology (see Patent Document 2). `` In various civil engineering works, it is an issue to provide a topsoil transplantation method, a topsoil transplanter, and a topsoil stripping mechanism that can be transferred as it is without destroying the natural environment and ecosystem of the topsoil. , Start peeling of the transplanted area Excavate the required depth over the peripheral area to form a topsoil step and place it, and use the appropriate means to bring the tip of the topsoil to the topsoil While maintaining the natural state without destroying the topsoil layer, remove the topsoil layer, and then use the topsoil transplanter as a transporter while fully loading the topsoil layer and load it on the transportation means and transport it to the transplant destination. After that, hoist the topsoil transplanter from the transportation means and bring it to just above the transplantation site, then lower it to the transplantation site, lay the topsoil layer on the transplantation ground and complete the transplantation. Adoption of the characteristic configuration method to be Te. "Is that. However, it is considered that the invention described in Patent Document 2 may cause stirring on the endless track of the tracked vehicle when dredging the accumulated soil.

  In addition, a technology in which the title of the invention is “a method for treating radioactive cesium-containing soil” is disclosed and is a known technology (see Patent Document 3). “The objective is to provide a method for treating radioactive cesium-containing soil that can improve decontamination efficiency and reduce the amount of waste generated. Specifically, soil containing radioactive cesium will have different specific gravity depending on the heavy liquid. The method for treating radioactive cesium-containing soil, comprising: a specific gravity separation step of separating the soil into a plurality of types of soil; and a cesium removal step of removing cesium contained in the soil subjected to the specific gravity separation. " However, the invention described in Patent Document 3 describes a method of differentiating specific gravity using a heavy liquid to separate into a high cesium concentration layer and a low cesium concentration layer, and removing cesium contained in the separated soil. However, there is no description about the means for removing the separated soil, and there is no technology related to the method of laying a floor plate such as an iron plate for moving heavy equipment.

  In addition, as described above, radioactive substances were released over a wide area due to the accident at the Fukushima Daiichi Nuclear Power Station due to the Great East Japan Earthquake, and decontamination of them has become a major issue, but these radioactive substances are gradually being removed by rainwater. It is transported to the etc. and is deposited on the bottom in the state of being adsorbed on the fine mud. Therefore, for decontamination of lakes and marshes, it is important to collect and treat the bottom mud adsorbed with these radioactive substances.

  As an example of such a dredging device for bottom mud in lakes and marshes, the invention described in the following [Patent Document 4] can be given. In the invention described in [Patent Document 4], a base ship is floated on the surface of a lake, a suction body equipped with a suction pump is hung from the base ship, and the mud accumulated on the bottom of the lake is sucked together with water. It is a technology of sending by pressure to a processing unit on the land side. However, in many cases, dead plants are accumulated on the bottom of lakes and marshes, and roots of aquatic plants and extracted plants are overgrown, and in the suction body described in [Patent Document 4], these foreign substances cause suction holes. It will be clogged and the suction ability will be significantly deteriorated. For this reason, it is necessary to periodically pull up the suction body to remove the foreign matter clogged in the suction port, and there is a problem that the work efficiency is extremely low.

JP, 2017-136515, A JP-A-2002-186314 JP, 2016-200437, A JP, 2014-80797, A

  The present invention, in particular, in the decontamination work of a soil layer such as a rainwater regulating pond and a reservoir pond in which the soil or the like is polluted to a high concentration by rainwater drainage containing a radioactive substance, a soft soil that contains a lot of water and mud is infinite. Even if excavation work is carried out using a track-tracked vehicle, the bottom of the pond will be pulled out without stirring the soil and by removing the support piles that have been placed, and the original function of the regulating pond etc. will be exhibited. Providing a method for excavating a contaminated soil layer that does not cause the problem of disappearing, and a method for excavating a contaminated soil layer, and agitation using an agitation peeling type suction device that finely cuts foreign substances such as aquatic plants and sucks them An agitation separation type suction method that uses a separation type suction system can be included, and this eutrophied bottom mud can be treated and reused to reduce the addition to the global environment. of Subjected to an object of the present invention.

  The present invention is a method of performing decontamination work without stirring soil by an endless track of a tracked vehicle, a support pile placing step of placing support piles, and a floorboard laying step of laying a floorboard, An excavation process, a removal process of a floor plate, an excavation process after the removal of the floor plate, and a pile head cutting process, and the floor plate laying process is performed by the track vehicle following the floor plate that has been laid. Is to construct a transportation path of the tracked vehicle by repeating a series of steps of transporting and constructing the support pile and the step of driving the support pile, and the excavation step excavates while removing the floor plate. In the pile head cutting step, the support pile at the location where the excavation is finished adopts a configuration in which the pile head is cut in accordance with the excavation surface.

  Further, the present invention includes a step of confirming an excavation path and a step of confirming an excavation depth before construction, and a rough root removal step after the support pile driving step and the floor plate laying step and before the excavating step. However, after the step of removing the floor plate, after the excavation step after removing the floor plate and before the pile head cutting step, a step of checking the excavation depth after construction, and a simple cesium concentration in the bottom mud after excavation It is also possible to adopt a configuration having a measurement step.

  Further, in the present invention, in the removing step, constituent means may be adopted in which the transport path is replaced and laid and moved substantially parallel to the laying direction.

  Further, the present invention, using a pine wood for the support pile, in the pile head cutting step, the pile head exposed from the ground after excavation is cut, leaving the remaining support pile in the soil. It is also possible to adopt a configuration that prevents the bottom of the regulating pond from being pulled out.

  Further, the present invention may employ a configuration in which the floor plate is made of metal or resin.

  Further, the present invention may employ a constituent means for performing the excavation performed in the excavation step and the excavation step after removing the floorboard with a backhoe or a vacuum.

  Further, the present invention is basically configured such that, in the reservoir, the portion where water is drawn uses the excavation method for the contaminated soil layer according to any one of claims 1 to 6, and the portion where water is accumulated is This is a method of comprehensively decontaminating the whole reservoir by using a stirring and peeling type suction method of sucking the bottom mud R together with water. The surface and both side surfaces are closed, and the front surface has a housing portion provided with a slide plate that is slidably installed and that changes the width of the opening on the front surface. The housing portion is located in front and agitates the bottom mud R. An agitating roller, a first cutting roller located behind the agitating roller and provided with a plurality of disc blades on its peripheral surface, and a plurality of disc blades located above the first cutting roller and having a peripheral surface. A second cutting roller provided on the first cutting roller, and the first cutting roller and the second cutting roller. The suction port is located behind the roller and has a pump unit for sucking the bottom mud R together with water; and a water supply hose connected to the pump unit for sending the sucked bottom mud R to the carrier side. The cutting roller rotates from the bottom to the top in the front view, and the second cutting roller rotates from the top to the bottom in the front view to remove the foreign matter caught in the gap between the first cutting roller and the second cutting roller. An agitating / peeling suction device that is cut by the disc blades of the first cutting roller and the second cutting roller, a ship that is located on the water surface and that suspends the agitating and separating suction device on the water bottom, and is provided on the land side. A bottom sludge treatment device, a hose member for feeding the bottom mud sucked by the stirring separation suction device to the bottom mud treatment device, and a moving unit for moving the stirring separation suction device, The stirring / peeling suction device is a moving means using a wire. By using a stirring and peeling type suction system which is a shaft type moving means for moving by pulling and moving the shaft or one end fixed to the stirring and peeling type suction device, the aforesaid barge is moved to a predetermined level on the water surface. The step of arranging at a position, the step of lowering the stirring and peeling type suction device from the pontoon to the water bottom, the operation of the stirring and peeling type suction device, the stirring roller stirs and scrapes the bottom mud, and the first The cutting roller and the second cutting roller cut foreign matter, and the pump unit sucks the bottom mud, the cut foreign matter and water, and the sucked bottom mud, the cut foreign matter and water. Pressure feeding to the bottom sludge treatment device through a hose member, step of separating the bottom sludge from the foreign matter and water by the bottom sludge treatment device and collecting, and a step of moving the stirring separation type suction device at the water bottom. Alternatively, a constituent means including

  Further, the present invention is a dehydration step of naturally dehydrating or pressurizing the bottom mud excavated by the method for excavating the contaminated soil layer, or the bottom mud aspirated by the stirring separation suction method, cesium concentration measurement / treatment. It is also possible to use a compost / fertilizer production method utilizing the above-mentioned reservoir basin comprehensive decontamination method in which fertilizer is obtained through a process and a fertilizer component adjustment / treatment process.

  According to the method for excavating a contaminated soil layer used in the method for comprehensive decontamination of a reservoir according to the present invention, since the heavy equipment moves on the laid board that is the transport path, the soil contaminated by the endless track of the tracked vehicle It exhibits an excellent effect that the decontamination work by excavation can be effectively performed without stirring.

  According to the method for excavating a contaminated soil layer used in the integrated decontamination method for a reservoir according to the present invention, it is possible to reduce the number of all floor boards used by replacing and relocating the floor boards.

  Further, in the method for excavating the contaminated soil layer used in the integrated decontamination method for the reservoir according to the present invention, in the configuration that uses the pine wood for the support pile, by leaving the support pile left, The effect of not pulling out the bottom of the.

  Further, in the removing step in the method for excavating a contaminated soil layer used in the integrated decontamination method for a reservoir according to the present invention, in the case of adopting a constituent means for transferring and laying the transfer path substantially parallel to the laying direction Has an excellent effect that the work of laying the floor plate can be efficiently performed.

  Further, among the integrated decontamination method of the reservoir according to the present invention, the stirring and peeling type suction device used in the stirring and peeling type suction method is a first cutting roller which rotates from bottom to top in front view, and the first cutting roller. And a second cutting roller which is located above the cutting roller and rotates from the top to the bottom in a front view. Then, the first and second cutting rollers cut foreign matter such as aquatic plants into a size that can be sucked by the pump unit. Therefore, the suction port of the pump unit is not clogged with foreign matter, and the suction capability of the pump unit can be maintained in a good state. As a result, the suction operation of the bottom mud can be continuously performed for a long time. Further, in the stirring and peeling type suction device according to the present invention, the upper surface, the back surface and both side surfaces are closed, and the front opening is adjusted to an appropriate opening width by the slide plate. It is possible to maintain the accumulated state of the bottom mud and to collect it effectively without raising it. In addition, the transparency of water can be maintained. Further, in the stirring / peeling suction device according to the present invention, the opening width of the front opening can be increased / decreased by the slide plate, so that the concentration of the bottom mud to be fed can be adjusted. Further, since the stirring and peeling type suction system and the stirring and peeling type suction method according to the present invention have the above stirring and peeling type suction device, there is an effect that the suction work of the bottom mud can be efficiently performed continuously for a long time. It is something to demonstrate.

It is a flowchart figure which shows the basic flow of the excavation construction method of the contaminated soil layer utilized by the reservoir pond comprehensive decontamination construction method which concerns on this invention. It is a process explanatory view explaining the support pile laying process and the laying plate laying process in the excavation method of the contaminated soil layer utilized by the reservoir pond comprehensive decontamination method according to the present invention. It is process explanatory drawing explaining the excavation process and removal process in the excavation method of the contaminated soil layer utilized by the reservoir pond comprehensive decontamination method which concerns on this invention. It is a process explanatory view explaining the excavation process after the floorboard removal and the pile head cutting process in the excavation method of the contaminated soil layer utilized by the reservoir pond comprehensive decontamination method according to the present invention. It is a construction-procedure explanatory drawing explaining the laying direction of the floor plate and the arrangement of the floor plate in the excavation method of the contaminated soil layer utilized by the reservoir pond comprehensive decontamination method according to the present invention. It is an arrangement | positioning structure explanatory drawing explaining the arrangement | positioning relationship of the floor board and a support pile in the excavation method of a contaminated soil layer utilized by the reservoir pond comprehensive decontamination method which concerns on this invention. It is an area | region explanatory drawing which shows the excavation construction method area | region of the contaminated soil layer utilized by the reservoir pond integrated decontamination construction method based on this invention, and the stirring separation type suction construction method area | region. It is a flowchart figure which shows the whole flow of the excavation construction method of a contaminated soil layer in the reservoir pond integrated decontamination construction method which concerns on this invention, the stirring peeling type suction construction method, and the manufacturing method of compost and fertilizer. It is a figure which shows the whole stirring and peeling type | formula suction system which can be utilized by the reservoir pond comprehensive decontamination construction method based on this invention. It is a figure which shows the stirring peeling type | formula suction system which can be utilized by the reservoir basin integrated decontamination construction method which concerns on this invention provided with another moving means. It is a figure which shows the stirring peeling-type suction apparatus which can be utilized by the reservoir pond comprehensive decontamination construction method which concerns on this invention. It is a figure which shows the 1st, 2nd cutting roller of the stirring peeling-type suction apparatus which can be utilized by the reservoir pond integrated decontamination method based on this invention. It is a figure which shows the example of the stirring roller of the stirring peeling-type suction apparatus which can be utilized by the reservoir pond comprehensive decontamination construction method which concerns on this invention.

  The excavation method 1 for the contaminated soil layer used in the integrated decontamination method for the reservoir according to the present invention is to lay a transportation path of a tracked vehicle with a floor plate in the excavation work of contaminated soil in a locally contaminated site such as a regulating pond. However, the greatest feature is that the tracked vehicle is moved only on the constructed transportation path. Hereinafter, description will be given with reference to the drawings.

  FIG. 1 is a flow chart showing the work steps of a method 1 for excavating a contaminated soil layer used in the integrated decontamination method for a reservoir according to the present invention. FIG. 1 (a) shows a basic flow of a method 1 for excavating a contaminated soil layer according to the present invention, and FIG. 1 (b) shows a work process in which a process that may be necessary for decontamination work is added. Is a flow showing. First, tools, devices, equipment, etc. used in the method 1 for excavating a contaminated soil layer according to the present invention will be described.

  The tracked vehicle 10 refers to a heavy machine or the like having an endless track 11. The excavation method 1 for the contaminated soil layer according to the present invention uses a backhoe for excavation, a movement of soil T packed in a drainage flexible container Q, or the like. For this purpose, a carrier dump is used, and a crawler crane or the like is used from the cargo handling stage 43 to the water treatment machine yard 44. Especially, the one used for excavation is a backhoe with a shovel (bucket) of the construction machine generally called hydraulic excavator attached to the operator side, which is equipped with an endless track 11 that is strong against mud and rotates the entire upper body. It is necessary to have a function, and a shovel with a forward facing is not suitable. The reason is that the tracked vehicle 10 can be moved only on the floor plate to prevent the soil T from being stirred by the endless track 11.

  The endless track 11 is a ring of shoe plates and shoes that are integrally connected so as to surround a starting wheel, a rolling wheel, and an idler wheel. By moving the ring with the starting wheel, the tracked vehicle 10 moves on an uneven terrain. Is what makes it possible.

  The support pile 20 is a pile to be laid in a place where the floor plate 30 is to be laid, and is not particularly limited in terms of material and size, and may be rope piles other than wooden piles, concrete piles, or resin piles. Based on the examples shown in FIGS. 5 and 6, a concrete example is given, in which a pine wood having a diameter of 200 mm × 2.0 meters is used for one sheet of the floor board 30 having a size of 1.5 × 3.0 meters. It is desirable to use about eight. This is because pine has an advantage in construction that it is denser and harder than other coniferous trees, and has high corrosion resistance even in water. Particularly, in the present invention, since the remaining support piles 20 after the pile heads 21 are cut off are left in the ground, the use of an organic material contributes to environmental protection.

  The pile head 21 is a portion that is cut according to the pond bottom of the support pile 20 of the path that has been excavated when excavating while removing the floor plate 30 and putting the excavated mud into the draining flexible container 9 and carrying it out. The unevenness of the pond bottom is eliminated by cutting the pile head after such excavation.

  The floor plate 30 is an iron plate or a resin-made hard plate member, and it is desirable that the floor plate 30 has a size of, for example, 1.5 meters × 3 meters made of iron and an aspect ratio of 2: 1. The reason is that, as shown in FIG. 5 and FIG. 6, after laying two laying plates horizontally, laying two laying plates vertically on them and repeating them alternately, the strength against bending in the plane direction is increased. This is because it is possible to increase it.

  The transport path 40 is a path that is created by laying a floor plate on a route along which the tracked vehicle 10 moves from the laying start position 41 in the laying direction 50. Further, the laying direction 50 is basically opposite to the removal direction 60, and the laying direction 50 for replacement is also performed while moving substantially in parallel, and construction is performed so that a wide range of excavation can be performed.

  Soil T is an object of excavation due to decontamination work, and in a rainwater regulating pond, a reservoir pond, etc. where rainwater drainage collects, a high concentration of radioactive substances is concentrated due to the accumulation of soil and leaves that contain radioactive substances. Soil that is likely to be (accumulated) or eutrophic mulch.

  The regulating pond and the storage pond P temporarily store rainwater flowing into the river due to localized flood such as heavy rain, reduce the burden on the downstream river and the sewer rainwater pipe, and are agricultural irrigation facilities, It is a storage pond that is managed by being fenced in so that the general public cannot enter.

Next, based on FIG. 1A, each step constituting the basic structure of the present invention will be described.
The method 1 for excavating a contaminated soil layer used in the comprehensive decontamination method for a reservoir according to the present invention is a method for performing decontamination work without stirring the soil T by the endless track 11 of the tracked vehicle 10, Contaminated soil layer composed of a pile driving step A, a floor laying step B, an excavation step E, a removal step F of the floor plate 30, an excavation step G after removal of the floor plate, and a pile head cutting step J. It is a method of excavating.

  FIG. 2 is a process explanatory view for explaining a support pile laying process and a laying plate laying process in the method 1 for excavating a contaminated soil layer used in the comprehensive decontamination method for a reservoir according to the present invention, and FIG. The pile driving process A is shown, and FIG. 2B shows the floor plate laying process B.

  The support pile driving step A is a step of driving the support piles 20 into the soil T, but the point of driving the support piles 20 at the place where the floorboard 30 is to be laid is measured with a measure or the like, and a heavy machine such as a backhoe is used. It is the process of placing. If plants such as vegetation are growing in the soil T before the support pile 20 is placed, the process of cutting the plants and stuffing them in sandbags, etc. and carrying them out are stored in a temporary storage place for handling organic matter. It goes without saying that there is a step of doing.

  The laying board laying step B is a step of laying the laying board 30 such as an iron plate on the ground surface of the pond, and specifically, it is necessary to place the laying board 30 on the support piles 20 that have been laid in good balance. Specifically, for example, as shown in FIG. 6 (a), two sheets are laid sideways on the support piles 20 driven in accordance with the floor plate 30, and two sheets are vertically laid so as to be orthogonal to the support piles 20. Is a step of constructing a conveyance path such as a heavy machine having improved strength against bending and bending. In addition, it is desirable to reinforce the connecting portion between the upper and lower laying plates by arranging three or more laying plates 30 in a superposed manner in the portion where the laying direction 50 changes, the cargo handling stage 43, and the like.

  FIG. 3 is a process explanatory diagram for explaining the excavation process E and the removal process F of the floor plate 30 in the excavation method 1 for the contaminated soil layer used in the comprehensive decontamination method for the reservoir according to the present invention, and FIG. The excavation process E is shown, and FIG. 3B shows the floorboard removing process F.

  The excavation step E is a step of excavating the inside of the path with a backhoe or the like, packing the excavated soil in a drainage flexible container Q, loading it on a carrier dump, carrying it to the cargo handling stage 43, and lifting it to the water treatment machine yard 44 by a crane. After that, the process proceeds to a general dehydration process. If the soil T has a high water content, it is also effective to inhale it by vacuum to remove the contaminated soil.

  The floorboard removing step F is a step of removing the floorboard and laying the floorboard 30 in a construction range to be constructed after the excavation of the floorboard portion other than the floorboard portion in the path is completed.

  FIG. 4 is a process explanatory diagram for explaining the excavation process G and the pile head cutting process J after removal of the floor plate in the excavation method 1 for the contaminated soil layer used in the comprehensive decontamination method for the reservoir according to the present invention. a) shows the excavation process G after removal of the floor plate, and FIG. 4B shows the pile head cutting process J.

  In the excavation process G after removing the floor plate, the area after the floor plate is removed is excavated. The excavated soil is packed in a drainage flexible container Q, loaded on a carrier dump, carried to a cargo handling stage 43, and lifted to a water treatment machine yard 44 by a crane. After that, the process proceeds to a general dehydration process.

  The pile head cutting step J is a step of cutting the pile head 21 exposed from the pond bottom after excavation with a chainsaw or the like if the construction effect in the pass can be confirmed.

  Next, based on FIG. 1 (b), each step generally required in the decontamination work by excavating the soil T will be described in addition to the step which is the basic configuration of the present invention.

  Confirmation of the excavation path and confirmation of the excavation depth before construction Step C is a step performed after the excavation step G after the removal of the floor plate, and places piles of marks at the four corners of the excavation path by coordinate management using a total station. It is the process of setting the laser level and lowering the telescopic rod equipped with the detection-side rope to the pond bottom before construction and confirming the numerical value of the detection-side rope indicated by the laser.

  The rough root removal step D is a step performed before the excavation step E, and is a step of roughly rooting the area by mounting a special root removal bucket on the backhoe. The roots that have been roughly removed are packed in a weatherproof sandbag, loaded into a carrier dump, transported to the cargo handling stage 43, hoisted above the bank S by a crane, and stored in a temporary storage location for handling organic matter.

  The step H of confirming the excavation depth after construction is a step performed after the excavation step G after removal of the floor plate, in which a laser level is set and the telescopic rod equipped with the inspection rope is lowered to the pond bottom after construction. It is a process to confirm the numerical value of the inspection rope indicated by the laser.

  The simple cesium concentration measurement step I after excavation is a step performed after the excavation depth confirmation step H after construction, in which soil near the center point of the path is collected using a long-handled scoop or the like. It is a process of muding, filling in a container, putting a container filled with soil in a polymeter, and performing a simple cesium concentration measurement by a predetermined method.

  FIG. 5 is a construction procedure explanatory diagram for explaining the laying direction of the floor plate 30 and the arrangement of the floor plate 30 in the method 1 for excavating a contaminated soil layer used in the method for comprehensive decontamination of a reservoir according to the present invention. The adjustment pond and the reservoir P shown in FIG. 1 are examples for explaining the arrangement and the procedure, and are not limited to the embodiments. The arrangement and the construction procedure can be changed within the scope of not losing the identity as the technical idea of the present invention.

  In the decontamination of the pond shown in FIG. 5, with the cargo handling stage 43 at the lower left of the figure as the laying start position 41, the laying plate 30 is laid from the laying direction 50 that goes upward to the laying direction 50 that goes to the right (primary laying laying plate). From the removal start position 42, excavation is performed within the excavation path, after the excavation, the floor plate is removed in the removal direction 60, the floor plate is removed, and then the excavation is repeated. The replacement laying direction 70 is the direction opposite to the direction 60 and parallel to the laying direction. The parallel transfer is repeated and the last conveyance path is removed in the removal direction 90. In the example, the number of primary installations was 217, the number of replacements was 474, the total number of sheets used was 474, and the number of support piles was 1,834.

  FIG. 6 is an arrangement configuration explanatory view for explaining an arrangement relationship between the floor plate 30 and the support pile 20 in the method 1 for excavating a contaminated soil layer used in the integrated decontamination method for a reservoir according to the present invention, and FIG. FIG. 6B shows the positional relationship between the floor plate 30 and the positional relationship between the floor plate 30 and the support pile 20.

  As shown in FIG. 6 (a), for example, by using a floorboard 30 having an aspect ratio of 2: 1 as in the standard size of 1524 mm (3 shaku) × 3048 mm (10 shaku) in length and width, two pieces are arranged in the horizontal direction. After laying the base plate 30 of No. 2 and laying the two base plates 30 vertically on the base plate 30 and repeating them alternately, it is possible to construct the transport path 40 while enhancing the strength against bending in the plane direction. Further, as shown in FIG. 6 (b), it is desirable to drive eight support piles having a diameter of 200 mm and a length of 2.0 m for each floor plate laid on the lower side. It should be noted that the dimensions of the laying plate 30 and the number of the laying 30 and the dimensions and the number of the driving piles 20 are merely examples, and are not limited to these, and are affected by the bearing capacity and the strength of the supporting piles. However, the invention can be changed within a range that does not lose the sameness as the invention embodied in the invention.

  FIG. 7 is a region explanatory view showing a region using a method for excavating a contaminated soil layer used in the integrated decontamination method for a reservoir according to the present invention and a region using a stirring separation suction method, and FIG. Shows the whole of the reservoir P in a top view, and FIG. 7B shows a vertical cross section of the reservoir P. The area from the bottom layer to the surface layer of the water body accumulated by the bank body S is agitated and peeled off, and the contaminated soil layer is excavated for the soft soil N in the area where the height of the surface layer is lowered by water absorption or dry water. Use the construction method. The order of the excavation method for the contaminated soil layer and the stirring separation suction method may be appropriately selected according to the amount of water, the water area, etc. For example, the stirring separation suction method sucks up to the bottom mud R and the soil T after suction is contaminated soil. Alternatively, the soil excavation method may be used for decontamination. On the other hand, the soft soil N in which the surface layer is lowered by the contaminated soil layer excavation method is excavated, and the area of the reservoir P where water is accumulated is agitated and separated. The bottom mud R may be sucked together with water by a suction method.

  FIG. 8 is a flow chart showing the overall flow of the method for excavating a contaminated soil layer and the agitation and peeling type suction method in the integrated decontamination method for a reservoir according to the present invention. As shown in FIG. 8, the present invention is basically configured to use the excavation method 1 for the contaminated soil layer, and uses the excavation method for the portion where water does not exist. On the other hand, when water is present, the stirring and peeling suction method is used from the lower layer to the surface layer. That is, the construction method 1 of the contaminated soil layer including the support pile placing step A, the floor laying step B, the excavation step E, the floor removing step F, the excavation step after the floor removing, and the pile head cutting step is the basic configuration, and in addition to this Thus, the flow may include a berth arranging step K1, a stirring / peeling suction device lowering step K2, a stirring / suction step K3, a pressure feeding step K4, a separation / collection step K5, and a water bottom movement step K6.

  As for the flow concerned, which construction method may be used depending on the amount of water present and the water area, as described above, the soil T discharged in any of the steps and steps may include plants such as aquatic plants and dead branches. Since there are many plant deposits and sufficient nutrients as organic fertilizers are included, natural dehydration or pressure dehydration is performed after the excavation process E or the separation and recovery step K5 in order to effectively utilize the soil. It is also effective to add a flow as a fertilizer manufacturing method for obtaining a fertilizer through the dehydration step X, the cesium concentration measurement / treatment step Y, and the fertilizer component adjustment / treatment step Z.

  As shown in FIG. 9 (a),

  Next, embodiments of the stirring and peeling type suction device 180, the stirring and peeling type suction system 102, and the stirring and peeling type suction construction method used in the sump pond comprehensive decontamination method according to the present invention will be described with reference to FIGS. 9 to 13. . Here, FIG. 9 and FIG. 10 are views showing the entire stirring and peeling type suction system 102 according to the present invention. Further, FIG. 11A is a schematic cross-sectional view showing the internal structure of the stirring and peeling suction device 180 according to the present invention, and FIG. 11B is a view of the stirring and peeling suction device 180 seen from the front. Further, FIG. 12 is a schematic view of the first cutting roller 130a and the second cutting roller 130b inside the stirring and peeling type suction device 180 as seen from the front side. FIG. 13 is a diagram showing an example of the stirring roller 140 of the stirring and peeling type suction device 180.

  The agitation and separation type suction system 102 according to the present invention shown in FIG. 9 sucks the bottom mud R of a reservoir, a pond, a lake, a digging, etc. together with water, and a pedestal 110 located on the water surface, and this pedestal 110. Agitation separation suction device 180 that is suspended from the bottom of the water, a bottom mud treatment device 114 provided on the land side, a hose member that connects the agitation separation suction device 180 and the bottom mud treatment device 114, and the ship 110 or And a moving means 150 for moving the stirring and peeling type suction device 180 installed on the land. As the hose member, a well-known relay pump 116 is installed on the pontoon 110, and a water supply hose 112 connected to the stirring and peeling suction device 180 and a relay hose 118 connected to the bottom mud treatment device 114 are connected to the relay pump 116. It is preferable to be configured by connecting via. According to this configuration, since the relay pump 116 assists the pumping of the bottom mud R or the like sucked by the stirring and peeling type suction device 180, even if the total length of the hose member is long, the bottom mud processing device 114 such as the bottom mud R is supplied. Can be pumped without delay.

  Further, the pontoon 110 is a scaffold on which an operator mainly operates and moves the stirring and peeling type suction device 180, and may be floated on the water surface by a float or the like, or a steel material may be laid over the water from the land side. , It may be fixed on the surface of the water.

Further, the bottom mud processing device 114 separates and collects the bottom mud R sucked together with water by the stirring and peeling type suction device 180, and any device may be used. The general bottom sludge treatment device 114 includes a well-known separation means for separating the sucked bottom mud R and foreign matters, a well-known bottom mud separation means for separating the bottom mud R and water, and the separated bottom. Well-known dehydration means for dehydrating and collecting the mud R is included.

  Further, the moving means 150 is for moving the stirring and peeling type suction device 180 at the water bottom, and any device may be used. Here, as a preferable example of the moving means 150, the configurations of the pulling means 150a and the shaft type moving means 150b will be described. First, the pulling means 150a has a wire 154 connected to the stirring and peeling type suction device 180, and a crane 152 capable of hoisting and unwinding the wire 154. In this configuration, the agitating / peeling suction device 180 can be hung, hoisted, and moved forward and laterally at the bottom of the water by the fall operation of the crane 152 and the hoisting / unwinding operation of the wire 154. Further, two traction means 150a may be provided so as to sandwich the lake where the bottom mud R is collected, and the stirring and peeling type suction device 180 may be moved forward and backward.

  Further, as shown in FIG. 10, the shaft type moving means 150b has one end of the shaft 156 fixed to, for example, the casing 128 of the stirring and peeling type suction device 180, and by pushing and pulling the shaft 156 from the pier 110 or the land. The stirring and peeling type suction device 180 is moved. The shaft type moving means 150b may suspend and stir the stirring and peeling type suction device 180 by a well-known winch or the like. Further, the moving means 150 is a combination of the pulling means 150a and the shaft type moving means 150b. For example, the stirring and peeling suction device 180 is moved forward by using the pulling means 150a, and the stirring peeling suction device 180 is moved backward by the shaft movement. You may make it perform using the means 150b. Then, particularly in the configuration using the moving means 150 capable of advancing and retracting the stirring and peeling type suction device 180, the lateral position of the stirring and peeling type suction device 180 is sequentially shifted to continuously and efficiently dredge the bottom mud R. I can do it.

  Next, the stirring / peeling suction device 180, which is a characteristic configuration of the present invention, will be described. The stirring / peeling suction device 180 according to the present invention is for suspending the bottom mud R together with water by suspending it from the above-mentioned pedestal 110 to the bottom of the water, and is positioned in front of the housing 128 and this housing 128. A stirring roller 140 that stirs the bottom mud R, a first cutting roller 130a located behind the stirring roller 140 and provided with a plurality of disc blades 134a on its peripheral surface, and above the first cutting roller 130a. A second cutting roller 130b that is located and is provided with a plurality of disc blades 134b on its peripheral surface, and is located behind these first cutting roller 130a and second cutting roller 130b, and sucks the bottom mud R together with water. It has a pump section 120 and a water supply hose 112 that is connected to the pump section 120 and sends the sucked bottom mud R to the side of the carrier 110. Further, the stirring and peeling type suction device 180 may further include a peeling roller 160 which is provided in front of the pump unit 120 and removes foreign matter attached to the suction port of the pump unit 120.

  In addition, as shown in FIGS. 11A and 11B, the casing 128 constituting the stirring and peeling type suction device 180 has an opening on the front surface and the bottom surface located in front of the stirring roller 140, and an upper surface and a back portion. The surface and the both side surfaces 128a are closed, and the inner surface has a box shape with an inclined surface. Then, the pump section 120 is fixed to this slope with the suction port inside. A slide plate 129 is slidably installed in the front opening of the casing 128. Then, by lowering the position of the slide plate 129 and narrowing and fixing the opening width of the front opening, the ratio of the bottom mud R taken in by the stirring separation type suction device 180 is increased and the bottom mud R sent to the bottom mud treatment device 114. The concentration of can be increased. Further, by raising the position of the slide plate 129 and expanding and fixing the opening width of the front opening, it is possible to cope with the case where the bottom mud R is thick. Further, the amount of water taken in can be increased to reduce the concentration of the bottom mud R sent to the bottom mud processing device 114.

  The top surface, back surface, and both side surfaces 128a of the housing 128 are closed, and the front opening is adjusted to an appropriate opening width by the slide plate 129. Therefore, the bottom mud stirred in the stirring and peeling suction device 180 is closed. R hardly leaks from the inside of the casing 128, and the bottom mud R can be effectively collected. Further, since the casing 128 shields the water flow generated by the rotation of the stirring roller 140, the cutting rollers 130a, 130b, etc. in the casing 128, it does not lift up the external bottom mud R, and the accumulation state of the bottom mud R Can be maintained and effective dredging can be performed. Further, the transparency of water can be maintained by preventing the bottom mud R from soaring. In particular, when the bottom mud R contains radioactive substances, efficient decontamination can be performed without re-diffusing these radioactive substances.

  As shown in FIGS. 11 and 12, a first motor 170a for rotating the first cutting roller 130a and the second cutting roller 130b, a stirring roller 140, and a peeling roller are provided on the upper surface of the casing 128. The second motor 170b for rotating 160 and the first motor 170b are fixed.

  As shown in FIG. 13, the stirring roller 140 includes a cylindrical roller 142 and a stirring member 144 installed on the peripheral surface of the roller 142. The shape of the stirring member 144 is not particularly limited, and may be a wire brush as shown in FIG. 13 (a) or a plate-like body as shown in FIG. 13 (b). Alternatively, a plate blade may be used as shown in FIG. Further, the stirring roller 140 may be replaceable. According to this configuration, for example, when there are many submerged plants such as algae, the stirring roller 140 of the wire brush is used, and when there are many extracted plants such as cattle and reeds, the stirring roller 140 of the plate blade is used. It is possible to select an appropriate stirring roller 140 depending on the environment, particularly the type of aquatic plant and the overgrowth state.

  The agitating roller 140 is rotatably attached to the casing 128 via a known bearing such as a bearing. The agitation roller 140 may be installed at a fixed position, or the position of the agitating roller 140 may be adjusted vertically or diagonally. A gear 146 is fixed to one end of the roller 142, and the gear 146 is connected to the reduction gear 172b of the second motor 170b via a power transmission mechanism (not shown) such as a chain. Then, as the second motor 170b rotates, the rotational force thereof is transmitted to the stirring roller 140 via the reduction gear 172b, the power transmission mechanism, and the gear 146, whereby the stirring roller 140 rotates. In addition, the rotation direction of the stirring roller 140 at this time is preferably a direction in which the stirring roller 140 rotates from top to bottom in a front view as shown by an arrow.

  The first cutting roller 130a and the second cutting roller 130b are cylindrical rollers 132a and 132b, and a plurality of disc blades 134a and 134b installed on the circumferential surface of the rollers 132a and 132b at substantially equal intervals. And scrapers 138a and 138b installed near the disc blades 134a and 134b. The disc blades 134a and 134b are used to cut foreign matter such as aquatic plants, and the installation interval is preferably about 5 cm to 15 cm. Further, the scrapers 138a and 138b have a function of catching and drawing in foreign substances such as aquatic plants, and crushing them.

  Both ends of the first and second cutting rollers 130a and 130b are rotatably attached to the casing 128 via known bearings. At this time, the second cutting roller 130b is installed above the first cutting roller 130a, for example, directly above or diagonally forward. Further, the installation interval between the first cutting roller 130a and the second cutting roller 130b is such that the disc blade 134a of the first cutting roller 130a and the disc blade 134b of the second cutting roller 130b overlap each other in a side view. The position is preferable. Therefore, it is preferable that the positions of the disc blades 134a and 134b and the scrapers 138a and 138b are slightly shifted in the axial direction between the first cutting roller 130a and the second cutting roller 130b. Further, it is preferable to dispose the disc blades 134a and 134b close to each other, and as shown in FIG. 4, between the disc blades 134a (134b) and the scraper 138a (138b) on the other side. Most preferably, the disc blade 134b (134a) is located. According to this configuration, foreign matter such as aquatic plants caught by the first and second cutting rollers 130a and 130b is effectively cut by the lower disc blade 134a and the upper disc blade 134b being sandwiched. You can

  Gears 136a and 136b are fixed to one ends of the first and second cutting rollers 130a and 130b, and these gears 136a and 136b are connected to a reduction gear 172a of the first motor 170a via a power transmission mechanism 174. . Here, the reduction gear 172a and the gear 136a of the first cutting roller 130a are connected via a chain as the power transmission mechanism 174, and the gear 136b of the second cutting roller 130b is fixed to the first cutting roller 130a. An example is shown in which the transmission gear 136c is used for connection. Then, as the first motor 170a rotates, its rotational force is transmitted to the first cutting roller 130a via the reduction gear 172a, the chain (power transmission mechanism 174), and the gear 136a, whereby the first cutting roller 130a is rotated. The cutting roller 130a rotates. The rotation direction of the first cutting roller 130a at this time is a direction in which the first cutting roller 130a rotates from bottom to top in the front view shown by the arrow in FIG. Further, the transmission gear 136c is rotated by the rotation of the first cutting roller 130a, and this rotational force is transmitted to the second cutting roller 130b by the gear 136b that meshes with the transmission gear 136c, whereby the second cutting roller 130b is rotated. 130b rotates from the top to the bottom in a front view in the opposite direction to the first cutting roller 130a shown by the arrow in FIG.

  At this time, it is preferable to make the rotation speed of the second cutting roller 130b slower than the rotation speed of the first cutting roller 130a by, for example, making the gear ratio of the gear 136b larger than that of the transmission gear 136c. According to this configuration, the disc blade 134a of the first cutting roller 130a and the disc blade 134b of the second cutting roller 130b rotate at different speeds, and the ability to cut foreign matters can be further improved. Further, by increasing the rotation speed of the lower first cutting roller 130a, the first cutting roller 130a can also play a role of stirring the bottom mud R. The ratio of the rotational speeds of the first cutting roller 130a and the second cutting roller 130b is preferably about 1: 4 to 1: 8, and most preferably about 1: 6.

  Further, the peeling roller 160 includes a cylindrical roller 162 and a peeling member 164 installed on the peripheral surface of the roller 164. Both ends of the peeling roller 160 are rotatably attached to the casing 128 via known bearings. The position of the peeling roller 160 at this time is a position where the peeling member 164 contacts or approaches the suction port of the pump unit 120. The peeling member 164 is not particularly limited, and a synthetic resin brush, spatula member, or the like can be used. A gear (not shown) is fixed to one end of the peeling roller 160, and the gear is connected to the reduction gear 172b of the second motor 170b via a power transmission mechanism (not shown) such as a chain. Then, when the second motor 170b rotates, the rotational force is transmitted to the peeling roller 160 via the reduction gear 172b, the power transmission mechanism, and the gear, and the peeling roller 160 is thereby rotated. In addition, the rotating direction of the peeling roller 160 at this time is not particularly limited, but the rotating direction from top to bottom in the front view shown by the arrow in FIG.

  The pump unit 120 is not particularly limited as long as it can suck a fluid having a certain degree of viscosity, and it is particularly preferable to use a well-known submersible sand pump.

  Next, the operations of the stirring and peeling type suction device 180 and the stirring and peeling type suction system 102 according to the present invention and the stirring and peeling type suction method according to the present invention using these will be described.

  First, the bottom mud treatment device 114 is installed on the land side of a reservoir, a pond, a lake, a dig, etc. where dredging is performed. Next, the pontoon 110 equipped with the stirring / peeling suction device 180 and the relay pump 116 is placed at a predetermined position on the water surface. At this time, the method of installing the pedestal 110 is not particularly limited. Next, the relay pump 116 and the stirring and peeling type suction device 180 are connected by the water supply hose 112, and the relay pump 116 and the bottom sludge treatment device 114 are connected by the relay hose 118. Next, the operator adjusts the position of the slide plate 129 to make the opening width of the front opening appropriate.

  Next, the operator operates the moving means 150 or the like to lower the stirring / peeling suction device 180 from the pontoon 110 to the water bottom. Next, the operator operates the stirring and peeling suction system 102. As a result, the first motor 170a and the second motor 170b of the stirring and peeling suction device 180 rotate, and the stirring roller 140 and the peeling roller 160 rotate from top to bottom in a front view. In addition, the first cutting roller 130a rotates from bottom to top in the front view, and the second cutting roller 130b rotates from top to bottom in the front view. Further, the pump unit 120 and the relay pump 116 operate to perform the suction operation. As a result, the agitating roller 140 agitates the sediment such as the bottom mud R and the earth and sand deposited on the bottom of the water and soars it to the first cutting roller 130a side, and at the same time, the aquatic plants, plant deposits such as dead branches, and foreign matter such as dust. Is lifted up or pulled out and sent to the first cutting roller 130a side. Then, the relatively small particles such as the bottom mud R and earth and sand that have been floated up pass through the gap between the first cutting roller 130a and the second cutting roller 130b and move to the pump unit 120 side. In addition, foreign matter such as aquatic plants, vegetable deposits, and dust are caught in the gap between the first cutting roller 130a and the second cutting roller 130b, and the disc blade 134a of the first cutting roller 130a and the second cutting roller 130a are cut. The disc blade 134b of the roller 130b cuts to an appropriate length. Then, it is discharged to the rear pump section 120 side. Since the upper surface, the inner surface, and the both side surfaces 128a of the housing 128 are closed as described above, the bottom mud R or the like that is lifted up hardly leaks to the outside of the housing 128, and water You can work while maintaining transparency.

  The pump unit 120 sucks the bottom mud R, the cut foreign matter, and the like together with the water, and pumps the water through the water supply hose 112 to the relay pump 116 side. Since the foreign matter has been cut to an appropriate size by the first and second cutting rollers 130a and 130b as described above, it does not get caught in the suction port of the pump unit 120. Further, even if it is caught in the suction port of the pump unit 120, the peeling roller 160 removes it and sends it to the first and second cutting rollers 130a, 130b. Then, the cutting process is performed again by the first and second cutting rollers 130a and 130b. Thereby, the suction port of the pump unit 120 is not clogged with foreign matter, and the suction capability of the pump unit 120 can be maintained in a good state. Then, the operator appropriately operates the moving means 150 to move the stirring and peeling type suction device 180 at the water bottom. As a result, new bottom mud R is taken into the housing 128 through the front opening limited by the slide plate 129, and continuously sucked and pressure-fed.

  The bottom mud R, earth and sand, water, foreign matter, etc. sucked by the pump unit 120 is sent to the relay pump 116 through the water supply hose 112, and is pressure-fed to the bottom mud processing device 114 through the relay hose 118. Then, first, foreign matter, pebbles, sand, etc. are separated and removed by a known separating means such as a sieve or a centrifugal separator. Next, it is stored in a well-known bottom mud R separating means such as a settling tank, and, for example, a coagulant is charged. As a result, the bottom mud R coagulates and separates from the water. The separated water is discharged to the original pond or the like through the water discharge pipe 115. Further, the sediment-concentrated bottom mud R is sent to, for example, a dehydrating means to be dehydrated, and then recovered and subjected to appropriate treatment.

  As described above, the stirring and peeling type suction device 180 according to the present invention includes the first cutting roller 130a that rotates from bottom to top when viewed from the front, and the first cutting roller 130a that is located above the first cutting roller 130a and that looks up when viewed from the front. And a second cutting roller 130b that rotates in the downward direction. Then, the first and second cutting rollers 130a and 130b cut foreign matters such as aquatic plants accumulated or proliferating on the water bottom into a size that can be sucked by the pump unit 120. Therefore, the suction port of the pump unit 120 is not clogged with foreign matter, and the suction capability of the pump unit 120 can be maintained in a good state. Thereby, the suction operation of the bottom mud R can be continuously performed for a long time.

  Further, the stirring and peeling type suction device 180 according to the present invention has the stirring roller 140 on the front side of the first and second cutting rollers 130a and 130b. The agitating roller 140 agitates the sediment such as the bottom mud R and earth and sand accumulated on the bottom of the water to assist suction by the pump unit 120, and floats foreign matter such as aquatic plants, dead plant and other plant deposits, and dust. It is raised or pulled out and sent to the first cutting roller 130a side. As a result, the load on the first and second cutting rollers 130a and 130b is reduced, and the foreign matter can be cut smoothly.

  At this time, in the stirring and peeling-type suction device 180 according to the present invention, since the upper surface, the back surface, and the both side surfaces 128a of the housing 128 are closed, the bottom mud R and the like stirred in the housing 128 is a housing. There is no leakage to the outside of the body 128, and it is possible to work while maintaining the transparency of the lake. Further, it is possible to maintain an accumulated state of the bottom mud R and perform an effective recovery work. In particular, when the bottom mud R contains radioactive substances, efficient decontamination can be performed without re-diffusing these radioactive substances. Further, by adjusting the position of the slide plate 129 according to the thickness of the bottom mud R and optimizing the opening width of the front opening, the bottom mud R having an appropriate concentration is pressure-fed to the bottom mud processing device 114 side. You can

  Furthermore, the stirring and peeling type suction device 180 according to the present invention has a peeling roller 160 in the vicinity of the suction port of the pump unit 120. The peeling roller 160 sweeps the suction port of the pump unit 120, and even if foreign matter is caught in the suction port of the pump unit 120, it can be removed. Thereby, the suction operation of the bottom mud R can be stably performed continuously for a long time.

  The stirring and peeling suction system 102 and the stirring and peeling suction method according to the present invention including the stirring and peeling suction device 180 can efficiently suck the bottom mud R continuously for a long time.

  It should be noted that the shapes, configurations, operating mechanisms, arrangements, piping paths, etc. of the respective parts of the stirring and peeling type suction device 180 and the stirring and peeling type suction system 102 shown in this example are examples, and are changed without departing from the scope of the present invention. It is possible to carry out.

  The dehydration step X is a step of performing natural dehydration or pressure dehydration for removing water from the excavated bottom mud R or the soil T. Specifically, the bottom mud R or the soil T is packed in a draining flexible container Q. This is a process of discharging excess water.

  In the cesium concentration measurement / treatment step Y, the concentration is measured from the turbid water containing radioactive cesium in the bottom mud R or soil T packed in the flexible container, and the concentration is classified into fine particles. This is a process of performing processing so that there is no such problem.

  The fertilizer component adjustment / treatment process Z is a process for effectively utilizing the portion of the soil T after dehydration that can be used as soil containing organic fertilizer, and analyzes the components of the soil so as to correspond to the type of crop. , Nitrogen, phosphoric acid, and potassium, which are said to be the three major nutrients of fertilizers, are added, and preferably calcium, magnesium, and further essential elements such as copper and zinc are added to suit various plant types and cultivation methods. This is the process of obtaining soil. By going through such a step, it is possible to distinguish the soil to be treated from the soil that can be effectively used, and reduce the load on the global environment.

  INDUSTRIAL APPLICABILITY The present invention is a control pond in which radioactive substances are concentrated (accumulated) by accumulating sediment, defoliation, etc., such as rainwater control ponds where rainwater drainage collects, reservoir ponds P, etc., and high concentrations of radioactive substances are observed. In the decontamination work such as a storage pond, it is possible to prevent the soil T from being agitated by the endless track of the tracked vehicle and to perform the effective decontamination work. In the field, industrial availability is considered to be high.

1 Excavation Method for Contaminated Soil Layer 10 Tracked Vehicle 11 Tracked Track 20 Support Pile 21 Pile Head 30 Laying Plate 40 Conveying Path 41 Laying Start Position 42 Removal Start Position 43 Cargo Stage 44 Water Treatment Machine Yard 50 Laying Direction 60 Removal Direction 70 Replacement Laying Direction 80 Replacement removal direction 90 Removal direction A Support pile driving process B Laying plate laying process C Confirmation of excavation path and confirmation of excavation depth before construction process D Rough root removal process E Excavation process F Removal process G Excavation process after floor plate removal H Confirmation of excavation depth after construction I Simple cesium concentration measurement process J Pile head cutting process K Step R Bottom mud S Dike T Soil
N Excavation method area for contaminated soil layer P Reservoir (stir-separation suction method area)
101 Agitating and Peeling Type Suction Method 102 Agitating and Peeling Type Suction System 110 Table 112 Water Hose 114 Bottom Mud Treatment Device
120 pump section
128 housing
128a side
129 slide plate
130a First cutting roller
130b Second cutting roller
134a, 134b Disc blade
140 stirring roller
150 means of transportation
150a traction means
150b Shaft type moving means
154 wire
156 shaft
160 peeling roller
180 Agitating and peeling type suction device
201 Fertilizer manufacturing method

The present invention, in particular, in the decontamination work of a soil layer such as a rainwater regulating pond and a reservoir pond in which the soil or the like is polluted to a high concentration by rainwater drainage containing a radioactive substance, a soft soil that contains a lot of water and mud is infinite. Even if excavation work is carried out using a track-tracked vehicle, the bottom of the pond will be pulled out without stirring the soil and by removing the support piles that have been placed, and the original function of the regulating pond etc. will be exhibited. Providing a method for excavating a contaminated soil layer that does not cause the problem of disappearing, and a method for excavating a contaminated soil layer, and agitation using an agitation peeling type suction device that finely cuts foreign substances such as aquatic plants and sucks them An agitation separation type suction method that uses a separation type suction system can be included, and this eutrophied bottom mud can be treated and reused to reduce the load on the global environment. of Subjected to an object of the present invention.

Further, the present invention is a dehydration step of naturally dehydrating or pressurizing the bottom mud excavated by the method for excavating the contaminated soil layer, or the bottom mud aspirated by the stirring separation suction method, cesium concentration measurement / treatment. step, and can be said pond comprehensive decontamination method fertilizer potting manufacturing method utilizing the through fertilizer component adjustment and processing steps to obtain a fertilizer potting.

The simple cesium concentration measurement step I after excavation is a step performed after the excavation depth confirmation step H after construction, in which soil near the center point of the path is collected using a long-handled scoop or the like. and mud, packed in containers, packed containers soil placed in co Rimeta is a process for the simple cesium concentration measurements in the default way.

As for the flow concerned, which construction method may be used depending on the amount of water present and the water area, as described above, the soil T discharged in any of the steps and steps may include plants such as aquatic plants and dead branches. Since there are many plant deposits and sufficient nutrients as organic fertilizers are included, natural dehydration or pressure dehydration is performed after the excavation process E or the separation and recovery step K5 in order to effectively utilize the soil. It is also effective to add a flow as a fertilizer culture soil manufacturing method for obtaining a fertilizer culture soil through a dehydration step X, a cesium concentration measurement / treatment step Y, and a fertilizer component adjustment / treatment step Z.

1 Excavation Method for Contaminated Soil Layer 10 Tracked Vehicle 11 Tracked Track 20 Support Pile 21 Pile Head 30 Laying Plate 40 Conveying Path 41 Laying Start Position 42 Removal Start Position 43 Cargo Stage 44 Water Treatment Machine Yard 50 Laying Direction 60 Removal Direction 70 Replacement Laying Direction 80 Replacement removal direction 90 Removal direction A Support pile driving process B Laying plate laying process C Confirmation of excavation path and confirmation of excavation depth before construction process D Rough root removal process E Excavation process F Removal process G Excavation process after floor plate removal H Confirmation of excavation depth after construction I Simple cesium concentration measurement process J Pile head cutting process K Step R Bottom mud S Dike T Soil
N Excavation method area for contaminated soil layer P Reservoir (stir-separation suction method area)
101 Agitating and Peeling Type Suction Method 102 Agitating and Peeling Type Suction System 110 Table 112 Water Hose 114 Bottom Mud Treatment Device
120 pump section
128 housing
128a side
129 slide plate
130a First cutting roller
130b Second cutting roller
134a, 134b Disc blade
140 stirring roller
150 means of transportation
150a traction means
150b Shaft type moving means
154 wire
156 shaft
160 peeling roller
180 Agitating and peeling type suction device
201 Fertilizer culture soil manufacturing method

The present invention also sediment was drilled by the drilling method of the contaminated soil layers, or sucked sediments by the 撹拌peelable suction method, natural dehydration or under圧脱water to the dehydration step, the cesium concentration measurement, can process steps, and also to the pond comprehensive decontamination method fertilizer Manufacturing method utilizing to obtain the fertilizer through the fertilizer component adjustment and processing steps.

As for the flow concerned, which construction method may be used depending on the amount of water present and the water area, as described above, the soil T discharged in any of the steps and steps may include plants such as aquatic plants and dead branches. Since there are many plant deposits and sufficient nutrients as organic fertilizers are included, natural dehydration or pressure dehydration is performed after the excavation process E or the separation and recovery step K5 in order to effectively utilize the soil. configuration flow for a dehydration step X, cesium concentration measurement and processing steps Y, and fertilizer Manufacturing method of obtaining a fertilizer through a fertilizer component adjustment and process Z is added is also effective.

1 Excavation Method for Contaminated Soil Layer 10 Tracked Vehicle 11 Tracked Track 20 Support Pile 21 Pile Head 30 Laying Plate 40 Conveying Path 41 Laying Start Position 42 Removal Start Position 43 Cargo Stage 44 Water Treatment Machine Yard 50 Laying Direction 60 Removal Direction 70 Replacement Laying Direction 80 Replacement removal direction 90 Removal direction A Support pile driving process B Laying plate laying process C Confirmation of excavation path and confirmation of excavation depth before construction process D Rough root removal process E Excavation process F Removal process G Excavation process after floor plate removal H Confirmation of excavation depth after construction I Simple cesium concentration measurement process J Pile head cutting process K Step R Bottom mud S Dike T Soil
N Excavation method area for contaminated soil layer P Reservoir (stir-separation suction method area)
101 Agitating and Peeling Type Suction Method 102 Agitating and Peeling Type Suction System 110 Table 112 Water Hose 114 Bottom Mud Treatment Device
120 pump section
128 housing
128a side
129 slide plate
130a First cutting roller
130b Second cutting roller
134a, 134b Disc blade
140 stirring roller
150 means of transportation
150a traction means
150b Shaft type moving means
154 wire
156 shaft
160 peeling roller
180 Agitating and peeling type suction device
201 fertilizer Manufacturing method

Claims (8)

A method of performing decontamination work without stirring soil (T) by an endless track (11) of a tracked vehicle (10),
A support pile placing step (A) for placing the support pile (20),
A laying plate laying step (B) of laying a laying plate (30),
Excavation process (E),
Removal step (F) of the floor plate (30),
Excavation process (G) after removal of the floorboard,
Pile head cutting process (J),
Consists of
In the laying board laying step (B), a series of steps in which the track vehicle (10) conveys the next laying board (30) on the laid down laying board (30) for continuous construction and the support piles. By constructing the transport path (40) of the tracked vehicle (10) by repeating the driving step (A),
The excavation step (E) is for excavating while removing the floor plate (30),
In the pile head cutting step (J), the support pile (20) at the location where the excavation is finished cuts the pile head (21) according to the excavation surface, and the method for excavating a contaminated soil layer. (1). After the support pile placing step (A) and the laying board laying step (B), but before the excavating step (E),
Confirmation process of excavation path and confirmation of excavation depth before construction (C),
Having a rough root removal step (D),
A step (F) of removing the floor plate (30),
After the excavation step (G) after removal of the floorboard and before the pile head cutting step (J),
Confirmation process (H) of excavation depth after construction,
The method for excavating a contaminated soil layer (1) according to claim 1, characterized in that the method comprises a simple cesium concentration measurement step (I) of the bottom mud R after excavation. The excavation method (1) for a contaminated soil layer according to claim 1 or 2, wherein in the removing step (F), the transport path (40) is replaced and laid and moved substantially parallel to a laying direction. ). A pine material is used for the support pile (20), and in the pile head cutting step (J), the pile head (21) exposed from the ground after excavation is cut, and the remaining support pile (20) is soiled ( The excavation method (1) for a contaminated soil layer according to claim 1 or 3, wherein the regulating pond (P) is prevented from being bottomed out by being left in T). The method for excavating a contaminated soil layer (1) according to any one of claims 1 to 4, wherein the floor plate (30) is made of metal or resin. The excavation performed in the excavation step (E) and the excavation step (G) after removal of the floorboard is performed by a backhoe or a vacuum, and the contaminated soil layer is excavated in any one of claims 1 to 5. Construction method (1). In the storage pond, the part where water is drawn is basically configured to use the contaminated soil layer excavation method (1) according to any one of claims 1 to 6, and the part where water is collected is the bottom mud ( A method of comprehensively decontaminating the entire reservoir by using the stirring and peeling type suction method (101) of sucking R) together with water,
The stirring and peeling suction method (101)
The front surface and bottom surface are open, and the top surface, back surface, and both side surfaces (128a) are closed,
The front surface has a housing portion (128) slidably installed and provided with a slide plate (129) for changing the width of the opening on the front surface,
An agitating roller (140) located forward and agitating the bottom mud R, and a first cutting roller (130a) located behind the agitating roller (140) and provided with a plurality of disc blades (134a) on its peripheral surface. ), A second cutting roller (130b) located above the first cutting roller (130a) and provided with a plurality of disc blades (134b) on its peripheral surface, and the first cutting roller (130a). ) And the second cutting roller (130b) has a suction port located behind the pump unit (120) for sucking the bottom mud (R) together with water, and the bottom mud (R) sucked by connecting with the pump unit (120). ) For sending water to the side of the barge (110), the first cutting roller (130a) rotates from bottom to top in front view, and the second cutting roller (130a). 130b) rotates from top to bottom in front view, The disc blades (134a, 134b) of the first cutting roller (130a) and the second cutting roller (130b) cut the foreign matter caught in the gap between the roller (130a) and the second cutting roller (130b). A stirring and peeling type suction device (180),
A pontoon (110) located on the water surface and suspending the stirring and peeling suction device (180) on the water bottom;
A bottom mud treatment device (114) provided on the land side,
A hose member for sending the bottom mud (R) sucked by the stirring separation type suction device (180) to the bottom mud treatment device (114),
A moving means (150) for moving the stirring and peeling suction device (180), and the moving means (150) pulls and moves the stirring and peeling suction device (180) by a wire (154). traction means (150a) or the stirring peeling type suction device (180) to press the shaft (156) which is fixed one end pulled by the shaft-type moving means for moving (150b) stirred peelable aspiration system Ru der to (102 ),
Arranging the ship (110) at a predetermined position on the water surface (K1),
A step (K2) of lowering the stirring and peeling type suction device (180) from the pontoon (110) to the water bottom;
The stirring / peeling suction device (180) is operated, the stirring roller (140) stirs and scrapes up the bottom mud (R), and the first cutting roller (130a) and the second cutting roller (130b). ) And a step (K3) of cutting the foreign matter and the pump part (120) sucking the bottom mud (R), the cut foreign matter and water.
A step (K4) of pumping the sucked bottom mud (R), the cut foreign matter and water to the bottom mud treatment device (114) via a hose member;
A step (K5) in which the bottom mud treatment device (114) separates and collects the bottom mud (R) from foreign matter and water;
Moving the stirring and peeling suction device (180) at the water bottom (K6),
Sumitomoike comprehensive decontamination method (3), which is characterized by Dehydration step (X) of naturally dehydrating or pressurizing the bottom mud R excavated by the contaminated soil layer excavation method (1) or the bottom mud (R) aspirated by the stirring separation suction method (101) ), A cesium concentration measurement / treatment step (Y), and a fertilizer component adjustment / treatment step (Z) to obtain fertilizer, the above-mentioned reservoir pond comprehensive decontamination method (3) is used. ).

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