JP6445888B2 - Backing material pouring mechanism in small diameter pipe propulsion device - Google Patents

Description

  The present invention relates to a backfilling material pouring mechanism in a small diameter pipe propulsion device.

  A small-diameter pipe propulsion method is known as a method for installing pipes for water and sewage, gas, and communication facilities in the ground without opening. Compared with the open-cut method, this method has many advantages such as a small road occupation area, a small amount of residual soil due to excavation, and a small noise and vibration.

  In this small-diameter pipe propulsion method, small-diameter propulsion pipes are sequentially connected to a leading conductor having a cutter, the propulsion pipe is pushed into the ground from the start side, and the propulsion pipe is laid as an embedded pipe between the start side and the arrival side It is a construction method. The cutter is connected to the tip conductor and a screw rod disposed inside the propelling pipe, and the earth and sand excavated by the cutter is discharged to the starting side by the screw rod.

  Concrete pipes and rigid polyvinyl chloride pipes (hereinafter simply referred to as polyvinyl chloride pipes) are used as propulsion pipes or buried pipes, but in the case of PVC pipes, the inner surface may be damaged by discharged gravel, etc. And the construction method which arrange | positions a screw rod in an inner pipe by making a propulsion pipe into a double pipe is known (refer patent document 1). In this case, an annular gap is formed between the outer pipe and the inner pipe of the double pipe, but this annular gap is not utilized at all.

  By the way, the diameter of the buried pipe used in the small-diameter pipe propulsion method is as small as 150 to 700φ, and therefore, the excavation by the cutter is also small, so that no countermeasure has been conventionally taken. However, for example, when laying a guide pipe (for example, see Japanese Patent No. 4198165) for passing a wire saw for ground cutting on the ground under the railway track by a propulsion method, it is small when overburden occurs. However, there is a risk that the rail will be deformed.

JP 09-60474 A

The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide a backfilling material pouring mechanism in a small diameter pipe propulsion device that can inject a backfilling material into an overexcavated portion while propelling a small diameter pipe.

The present invention employs the following means in order to achieve the above object.
That is, the present invention includes a double pipe having a leading outer pipe and an inner leading earth discharging pipe forming an annular gap, the annular gap at the tip being closed, and the leading earth discharging pipe disposed in the leading earth discharging pipe. A leading conductor consisting of a leading screw rod with a cutter connected to the tip protruding from the tip of the
A double pipe having an outer buried pipe and an inner earth discharging pipe forming an annular gap, and the buried pipe and the earthing pipe are sequentially connected to the leading outer pipe and the leading earth discharging pipe, respectively, A small-diameter pipe propulsion device having a diameter of the buried pipe of 150 to 700φ, and a propulsion pipe composed of a screw rod sequentially connected to the leading screw rod.
A supply conduit for a backfilling material extending from the starting side of the leading conductor through the annular gap of the propulsion pipe to the annular gap of the leading conductor is provided, and a spout for the backfilling material is provided in the leading outer pipe ,
The spout is provided with a check valve that is opened by the pressure of the backfill material ,
Provide a earth pressure gauge to be located near the spout in the leading outer pipe,
A first automatic valve is provided in the supply pipe in the leading conductor, and is branched upstream of the first automatic valve and extends to the starting side through the annular gap of the leading conductor and the annular gap of the propulsion pipe. A return line is provided, a second automatic valve is provided in the return line,
A plurality of sets of dispensing mechanisms including a set of a piping system including the supply pipeline and the return pipeline, the spout, the check valve, and the earth pressure gauge are provided at intervals in the circumferential direction of the annular gap. It is in the backfilling material pouring mechanism in the small diameter pipe propulsion device characterized by the above.

  Furthermore, the structure which provided the backflow prevention blade | wing for preventing the backflow of a backfilling material so that it may be located in the front-end | tip side rather than the said spout can also be employ | adopted for the outer periphery of the said leading outer tube | pipe.

  According to the present invention, in the small-diameter pipe propulsion device using the leading conductor and the propulsion pipe as a double pipe, the back-filling material pouring mechanism is provided using the annular gap of the double pipe. While propelling, it is possible to fill the backfill with backfill material.

It is a horizontal sectional view showing an embodiment of this invention. It is a vertical sectional view of the same embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a top view which expands and shows the extraction | pouring part of backfilling material. FIG. 5 is a cross-sectional view taken along line B-B in FIG. 4. It is CC sectional view taken on the line of FIG.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention, FIG. 1 is a horizontal sectional view, FIG. 2 is a vertical sectional view, FIG. 3 is an A-A line cross-sectional view taken along FIG. The small-diameter pipe propulsion device includes a leading conductor 1 and a number of propulsion pipes 2 (only one is shown in the figure) that are sequentially connected thereto.

  The leading conductor 1 is composed of a double pipe having a leading outer pipe 3 and an inner leading earth discharging pipe 4, and a leading screw rod 5 disposed in the leading earth discharging pipe 4 and having a spiral blade 5a. An annular gap 6 is formed between the leading outer pipe 3 and the leading earth discharging pipe 4. The leading outer pipe 3 and the leading earth discharging pipe 4 are both made of steel pipes in this embodiment.

  An annular mounting portion 7 is provided at the tip of the leading outer tube 3. An annular joint member 9 having a tapered surface 8 on the inner side is detachably fixed between the attachment portion 7 and the distal end portion of the leading inner tube 4. The joint member 9 closes the annular gap 6 between the leading ends of the leading outer pipe 3 and the leading earth discharging pipe 4.

  The tip of the leading screw rod 5 protrudes from the leading soil discharge pipe 4, and a cutter 10 is fixed to the leading end. The cutter 10 is connected to a reed pipe 11 which is previously installed in the ground so as to be rotatable. Reference numeral 22 denotes a spacer which is provided between the leading outer pipe 3 and the leading earth discharging pipe 4 and is held so that the axes of both are substantially coincident with each other.

  The propulsion pipe 2 is composed of a double pipe having an embedded pipe 12 and a soil discharge pipe 13 inside thereof, and a screw rod 14 disposed in the soil discharge pipe 13 and having a spiral blade 14a. An annular gap 15 is formed between the buried pipe 12 and the soil discharge pipe 13. In this embodiment, the buried pipe 12 is made of a hard PVC pipe, and the earth discharging pipe 13 is made of a steel pipe. Male threads 16 and 17 are formed at the front end portions of the buried pipe 12 and the soil discharge pipe 13, respectively, and female threads 18 and 19 are formed at the rear end portions, respectively.

The buried pipe 12 and the earth discharge pipe 13 are screwed into the female threads 20 and 21 formed on the rear end portions of the leading outer pipe 3 and the leading earth discharging pipe 4, respectively. 3 is connected to the buried pipe 12, and the leading earth discharging pipe 4 is connected to the earth discharging pipe 13. The leading screw rod 5 and the screw rod 14 are connected via a joint member (not shown). The preceding propulsion pipe 2 and the subsequent propulsion pipes are similarly connected. As a result, the annular gap 6 of the leading conductor 1 and the annular gaps 15 of many propulsion pipes 2 communicate with each other.

  The connection of the propulsion pipe 2 to the leading conductor 1 and the connection of the propulsion pipes 2 are performed on the start side (starting shaft) (not shown) where the main pushing device is installed. And the leading conductor 1 and many propulsion pipes 2 connected to this by the main pushing device are pushed into the ground toward the reaching side (the reaching shaft). Further, the screw rods 5 and 14 are driven to rotate by the main pushing device, and the ground is excavated by rotating the cutter 10. The excavated soil is discharged to the starting side through the discharge pipes 4 and 13 by the screw rods 5 and 14. After the leading conductor 1 reaches the reaching side, the leading conductor 1 is collected on the reaching side, and the earth discharging pipes 4 and 13 are collected on the starting side. As a result, only the buried pipe 12 is buried in the ground and used for various purposes.

  In the propulsion construction of the propelling pipe 2 as described above, as shown in FIG. The small-diameter pipe propulsion device according to the present invention includes a mechanism for pouring backfill material into the portion V where the excessive excavation occurs. A supply pipe 25 for supplying the backfilling material extends from the starting side to the annular gap 6 of the leading conductor 1 through the annular gap 15 of the propulsion pipe 2.

  The distal end of the supply pipe 25 opens to a spout 26 provided at the top of the leading outer pipe 3. A check valve 27 is provided at the spout 26. 4 to 6 are enlarged views of the extraction portion of the backfill material, FIG. 4 is a plan view, FIG. 5 is a cross-sectional view taken along line BB in FIG. 4, and FIG. 6 is a line CC in FIG. It is arrow sectional drawing.

A rectangular attachment panel 28 is provided on the top of the pipe wall of the lead outer pipe 3, and a spout 26 is formed in the attachment panel 28. A rectangular opening 29 for mounting the mounting panel 28 is provided in the tube wall of the leading outer tube 3. A fixed frame 30 is fixed to the inner periphery of the leading outer tube 3 along the periphery of the opening 29. The mounting panel 28 is fitted into the opening 29 and is fixed to the inner peripheral portion of the fixing frame 30 protruding inward of the opening 29 by bolts 31.

  A circular recess 32 is provided in the mounting panel 28, and a circular spout 26 is formed at the bottom 32 a of the recess 32. The valve element 33 of the check valve 27 is disposed at the bottom 32 a of the recess 32 so as to close the spout 26. The valve body 33 has a circular shape, and the distal ends of a plurality of bolts 34 having flanges 34 a at the distal ends are fixed to the valve body 33 at intervals in the circumferential direction of the valve body 33.

  The shaft portion of the bolt 34 is fitted in a hole provided in the bottom portion 32a of the recess 32 so as to be movable in the axial direction. A coil spring 35 surrounding the shaft portion of the bolt 34 is provided between the head portion of the bolt 34 projecting inward from the hole and the bottom portion 32 a of the recess 32. The valve spring 33 is always urged by the coil spring 35 so as to close the spout 26. On the other hand, when the pouring pressure of the backfilling material supplied via the supply pipe 25 acts on the valve body 33, the valve body 33 opens against the biasing force of the coil spring 35, and the spout 26 opens to the back. The filling material is poured out to the outer periphery of the leading outer tube 3.

  The mounting panel 28 is also provided with a soil pressure gauge 36 adjacent to the spout 26. The earth pressure gauge 36 is fitted and fixed in a hole 37 formed in the mounting panel 28.

  Referring to FIGS. 1 and 2 again, the supply line 25 is provided with a first automatic valve 40 made of an electromagnetic valve, an electric valve, or the like in the leading conductor 1. Further, the supply pipe 25 branches in the leading conductor 1 on the upstream side of the first automatic valve 40, and returns to the starting side through the annular gap 6 of the leading conductor 1 and the annular gap 15 of the propulsion pipe 2. 41 is provided. The return pipe 41 is provided with a second automatic valve 42 made of an electromagnetic valve, an electric valve, or the like in the vicinity of the first automatic valve 40, that is, in the propulsion pipe 2 directly connected to the leading conductor 1.

  The pipe system including the supply pipe line 25 and the return pipe line 41, and the pouring mechanism including the mounting panel 28 provided with the spout 26, the check valve 27, and the earth pressure gauge 36 are provided in the annular gaps 6, 15 A plurality of sets are provided at intervals in the circumferential direction (see FIG. 3). In this embodiment, two sets of pouring mechanisms P1 and P2 are provided, and the leading conductor 1 is propelled so that the pouring outlet 26 of one pouring mechanism P1 is positioned at the top of the leading outer tube 1.

  A backflow prevention blade 43 for preventing backflow of the backfill material is provided on the outer periphery of the leading outer pipe 3 so as to be positioned on the tip side of the spout 26. As shown in FIG. 3, the backflow prevention blades 43 are fixed to the outer periphery of the leading outer tube 3 at their bases so that adjacent plates 44 partially overlap each other. is there. Each plate 44 is inclined and fixed to the leading outer tube 3 so that the diameter of the backflow prevention blade 43 increases toward the rear (starting side) in the propulsion direction of the leading outer tube 3. The backflow prevention blades 43 are subjected to earth pressure during the propulsion of the leading outer tube 1 and are reduced in diameter by the elasticity of the plates 44.

  Next, the operation of the backfill material dispensing mechanism will be described. When propelling the leading conductor 1 and the propelling pipe 2, a backfill material such as cement mortar is supplied to the spout 26 via the supply pipe 25. At this time, the first automatic valve 40 is open and the second automatic valve 42 is closed, and the backfill material does not flow through the return pipe 41. The backfilling material opens the valve body 33 of the check valve 27 by the pouring pressure, and is poured out to the outer periphery of the leading outer pipe 3. The extracted backfilling material is filled in the cavity V formed by the excavation generated on the outer periphery of the lead outer pipe 3.

  On the other hand, the earth pressure gauge 36 constantly measures the earth pressure acting on the outer periphery of the leading outer pipe 3, and inputs the measurement signal to a control device (not shown). When the measured value of the earth pressure gauge reaches a predetermined value, the control device stops supplying the backfill material. As a result, it is possible to prevent adverse effects such as the ground rising due to excessive pouring pressure of the backfilling material.

  If the poured backfilling material flows out (reverse flow) to the leading end side of the leading outer pipe 3 and flows into the vicinity of the cutter 10, it causes trouble. However, since the leading outer pipe 3 is provided with the backflow prevention blade 43, the backflow of the backfilling material can be prevented.

  When the one day propulsion work process is completed, the first automatic valve 40 is closed and the second automatic valve 42 is opened. Wash water is supplied to the supply line 25 from the start side. This washing water flows into the return pipe 41 in the leading conductor 1 and is collected on the starting side. As a result, the supply conduit 25 can be cleaned, and the backfill material can be prevented from solidifying in the supply conduit 25.

  Referring to FIG. 3, the extraction mechanism P <b> 1 located at the top of the leading outer pipe 3 out of the two extraction mechanisms P <b> 1 and P <b> 2 is used for extraction of the backfill material during the propulsion construction. When the supply pipe 25 of the extraction mechanism P1 has trouble such as clogging during the propulsion construction, the leading conductor 1 and the propulsion pipe 2 are rotated so that the extraction mechanism P2 is located at the top. Then, the backfill material is poured out through the supply pipe 25 of the dispensing mechanism P2. Thereby, propulsion construction can be continued without interruption. Thus, in FIG. 3, the extraction mechanism P2 located on the side of the leading conductor 1 serves as a preliminary function.

  Note that the number of dispensing mechanisms is not limited to two, and three or more may be provided. Further, depending on the geology, the backfill material may be poured out not only from the top of the leading conductor 1 but also from the side.

1: Leading conductor 2: Propulsion pipe 3: Leading outer pipe 4: Leading earth discharging pipe 5: Leading screw rod 6: Annular gap 10: Cutter 12: Buried pipe 13: Earthing pipe 14: Screw rod 15: Annular gap 25: Supply pipe Path 26: Outlet 27: Check valve 28: Mounting panel 33: Valve body 35: Coil spring

Claims (2)

A double pipe having a leading outer pipe and an inner leading earth discharging pipe forming an annular gap, the tip of the annular gap being closed, and a tip disposed in the leading earth discharging pipe and projecting from the tip of the leading earth discharging pipe A leading conductor consisting of a leading screw rod connected to the cutter,
A double pipe having an outer buried pipe and an inner earth discharging pipe forming an annular gap, and the buried pipe and the earthing pipe are sequentially connected to the leading outer pipe and the leading earth discharging pipe, respectively, A small-diameter pipe propulsion device having a diameter of the buried pipe of 150 to 700φ, and a propulsion pipe composed of a screw rod sequentially connected to the leading screw rod.
A supply conduit for a backfilling material extending from the starting side of the leading conductor through the annular gap of the propulsion pipe to the annular gap of the leading conductor is provided, and a spout for the backfilling material is provided in the leading outer pipe ,
The spout is provided with a check valve that is opened by the pressure of the backfill material ,
Provide a earth pressure gauge to be located near the spout in the leading outer pipe,
A first automatic valve is provided in the supply pipe in the leading conductor, and is branched upstream of the first automatic valve and extends to the starting side through the annular gap of the leading conductor and the annular gap of the propulsion pipe. A return line is provided, a second automatic valve is provided in the return line,
A plurality of sets of dispensing mechanisms including a set of a piping system including the supply pipeline and the return pipeline, the spout, the check valve, and the earth pressure gauge are provided at intervals in the circumferential direction of the annular gap. A backfilling material pouring mechanism in a small diameter pipe propulsion device.   The small-diameter pipe according to claim 1, wherein a backflow prevention blade for preventing backflow of the backfilling material is provided on the outer periphery of the leading outer pipe so as to be positioned on the tip side of the spout. Backfilling material extraction mechanism in the propulsion device.

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