JP5328632B2 - Underground soil collection method - Google Patents

Description

  The present invention relates to a method for collecting soil at a soil sampling target position in the ground using a free curve excavator.

  A method of excavating to a soil sampling target position using a free curve excavator and taking the soil at the soil sampling target position into the excavation head (see, for example, Patent Document 1), or a sampling pipe in the soil in front of the excavation head There is known a method (see, for example, Patent Document 2) in which the soil at the target position for soil collection is taken in and collected in a sampling tube.

JP 2001-64957 A JP 2007-270608 A

However, in Patent Document 1, the piston is pushed toward the tip side of the excavation head by water pressure in the excavation head, and excavated while jetting water from the tip of the excavation head to the front of the excavation head to reach the soil collection target position. In this case, the water pressure is released and the soil muddy with water is taken into the excavation head from the tip of the excavation head, and the soil taken into the excavation head becomes muddy water with a high water content. In some cases, it is not possible to accurately survey soil components. In patent document 2, since a straight pipe | tube protrudes ahead from the front-end | tip of an excavation head in the ground, soil cannot be extract | collected by a curved excavation path | route. In both Patent Documents 1 and 2, there is a problem that it is difficult to take out the collected soil from the excavation head or the sampling pipe.
The present invention has been made in view of the above problems, and can collect soil even in a curved excavation route by a free-curve excavator, and can accurately investigate the soil component, and can easily extract the collected soil. Provide a method.

The underground soil sampling method according to the present invention is to excavate the ground from the starting point of the excavation through the soil sampling target position using the excavation bit provided at the tip of the rod portion of the free-curved excavator to bring the excavation bit to the ground. After removal, remove the excavation bit from the tip of the rod part, attach a soil sampling pipe device to the tip of the rod part, and return the soil sampling pipe device to the soil sampling target position via the inside of the excavation hole dug out of the ground After taking the soil at the soil collection target position inside the soil sampling pipe device, pull the soil sampling pipe device back to the drilling start point of the excavation hole and put it on the ground, or push it to the excavation end point of the excavated drilling hole The soil sampling pipe device is configured to take out the soil taken into the soil sampling pipe device by taking it out to the ground, and the soil sampling pipe device has an opening on the peripheral surface and a rod portion. Through An outer tube that can rotate around the central axis by receiving the rotational driving force, an inner tube that is installed in the outer tube coaxially with the central axis of the outer tube, and has a soil intake hole on the peripheral surface, and an inner tube The soil intake hole clogging provided to protrude outward from the outer peripheral surface of the outer pipe through the opening of the outer pipe from the hole edge extending in the direction along the central axis of the inner pipe in the soil intake hole Body and a lid that closes the openings at both ends of the outer pipe, and when the outer pipe is rotated in one direction in the ground, the soil intake hole communicates with the ground through the opening, When the outer pipe is rotated in the other direction, the opening edge extending in the direction along the central axis of the outer pipe at the opening of the outer pipe comes into contact with the soil intake hole and the soil intake hole Since it is configured to be closed, soil can be collected at a site that cannot be excavated directly from the ground. Soil taken into the inner tube of a, by rotating the inner tube by operating the soil intake hole 塞体 easily taken out. In addition, soil can be collected even on a curved excavation route by a free-curve excavator, and the soil component can be surveyed accurately.
The ground soil sampling method according to the present invention is to excavate from the excavation start point to the soil sampling target position by using the excavation bit provided at the tip of the rod portion of the free curve excavator, and then return the excavation bit to the excavation start point and put it on the ground. After removing the excavation bit from the tip of the rod part, attach the soil sampling pipe device to the tip of the rod part, attach the excavation bit to the tip of the soil sampling pipe apparatus, and drill the excavation bit and soil sampling pipe device into the excavation hole Return to the soil sampling target position via the inside, take the soil at the soil sampling target position into the soil sampling pipe device, return the soil sampling pipe device to the excavation start point, and take out the soil inside the soil sampling pipe device In the sampling method, by using the soil sampling pipe device, soil can be removed even at sites that cannot be excavated directly from the ground or sites that cannot be excavated underground. It can be collected, and the above-mentioned effects can be obtained.
In addition, if the soil sampling tube device is configured to include a lock portion that maintains a state where the soil intake hole is closed by contact of the soil intake hole blockage body and the opening edge of the opening of the outer tube. It is possible to prevent the soil intake hole from being opened during the movement of the soil sampling tube device. Therefore, the soil in the ground other than the soil collection target position is taken into the inner pipe, or the contaminated soil taken in the inner pipe at the soil collection target position is scattered in the ground other than the soil collection target position to expand the pollution. Can be prevented.

The figure which shows the underground soil collection method (embodiment 1). A perspective view showing a soil sampling pipe device (embodiment 1). 1 is an exploded perspective view of a soil sampling tube device (Embodiment 1). FIG. The longitudinal cross-sectional view along the center axis line of the soil sampling pipe apparatus (Embodiment 1). The figure which shows the underground soil collection method (embodiment 2). The longitudinal cross-sectional view along the center axis line of the soil sampling pipe device (Embodiment 2). An exploded perspective view of a soil sampling tube device (Embodiment 3). The longitudinal cross-sectional view along the center axis line of the soil sampling pipe device (Embodiment 3). An exploded perspective view of a soil sampling pipe device (embodiment 4).

Embodiment 1
With reference to FIG. 1, the soil collection apparatus 1 used for the soil collection method is demonstrated. The soil collection device 1 is composed of a free curve excavator 2 and a soil collection pipe device 3.

  As shown in FIG. 1 (a); (b); FIG. 6, the free-curved excavator 2 includes a rod portion 5, a drill bit 6 provided at the tip 5t of the rod portion 5, and a tip portion of the rod portion 5. Alternatively, a position detection sensor 7 such as a magnetic sensor or a gyro sensor provided in the excavation bit 6 and a drive device 8 for moving the rod portion 5 back and forth or rotating it are provided. The excavation bit 6 has a configuration in which an elliptical inclined surface 9 in which one end opening of a solid cylinder is cut off obliquely is provided at the tip, and a rock drill bit (not shown) is provided on the elliptical inclined surface 9. The excavation bit 6 includes an excavation fluid injection hole 6d at the tip, and an excavation fluid supply path 6e that communicates the excavation fluid injection hole 6d with the internal space 5u of the rod portion 5 therein. The rod portion 5 is configured by sequentially adding a plurality of rods 5a formed of, for example, a metal circular pipe as excavation progresses. For the connection between the rods 5a, for example, a connection member (not shown) such as a screw joint is used. The position detection sensor 7 is embedded in a hollow portion formed on the rear end side of the excavation bit 6.

  As shown in FIG. 2, the soil sampling tube device 3 includes an outer tube 11, an inner tube 12, a soil intake hole blocking body 13, a connecting member 14, and a drawing member 15.

  3; As shown in FIG. 4, the outer tube 11 and the inner tube 12 are formed of a metal circular tube such as a steel tube whose cross section perpendicular to the central axis a of the outer tube 11 is annular. The outer tube 11 is provided with an opening 16 penetrating the inner peripheral surface and the outer peripheral surface in a part of the peripheral surface of the circular tube, and female screw portions 17; 17 on the inner peripheral surface of both end openings 25; 25a. Is provided. The inner pipe 12 includes a soil intake hole 18 penetrating the inner peripheral surface and the outer peripheral surface in a part of the peripheral surface of the circular pipe. The inner tube 12 is installed inside the outer tube 11, and the inner tube 12 and the outer tube 11 are configured to be rotatable about a central axis a common to the inner tube 12 and the outer tube 11 (see FIG. 4). ). That is, the outer tube 11 is rotatable about the central axis a by receiving a rotational driving force via the rod portion 5, and the inner tube 12 is installed in the outer tube coaxially with the central axis a of the outer tube 11. And can be rotated about the central axis a. As described above, the inner tube 12 and the outer tube 11 are provided so as to be rotatable about the central axis a, and the inner diameter and inner diameter of the outer tube 11 are set so that the inner tube 12 does not tilt with respect to the central axis a. Appropriate values are set such that the outer diameter dimension of the tube 12 is close to each other (for example, the outer diameter dimension of the inner tube 12 is set to be a few mm smaller than the inner diameter dimension of the outer tube 11). The opening 16 is formed in a rectangular hole that curves along the circumferential direction on the circumferential surface. In other words, the rectangular hole extends along the central axis a of the outer tube 11 and extends along the circumferential direction of the two outer side edges 16a; Is a hole having a curved rectangular opening edge with two short side edges facing each other. The soil intake hole 18 has a hole size that is slightly smaller than the hole size of the opening 16 and is formed in the same shape as the opening 16, for example.

  A soil intake hole blocking body 13 called a blade is provided on one long edge 19 side of the soil intake hole 18. The soil intake hole blocking body 13 is formed by, for example, a rectangular plate that extends along the central axis a of the inner tube 12 and extends in a direction orthogonal to the central axis a (direction along the diameter of the inner tube 12). The The rectangular plate is a pair of edges facing each other in parallel and formed in the same length as one long edge 19 which is a hole edge extending in the direction along the central axis a in the soil intake hole 18. 21; 22 and the other pair of side edges 21a; 22a that connect the ends of the pair of side edges 21; 22 to each other. One side 21 side of the pair of side edges 21; 22 of the soil intake hole blocking body 13 and one long side edge 19 side of the soil intake hole 18 are welded or connected to each other (for example, soil collection By connecting the bracket provided on one edge 21 of the insertion hole closing body 13 to the peripheral surface of the inner tube 12 with a bolt or the like), the soil intake hole closing body 13 is connected to the soil intake hole. It is provided so as to protrude outward from the outer peripheral surface of the outer tube 11 through the opening 16 of the outer tube 11 from one long side edge 19 of 18.

Of the pair of edges 21; 22 in the soil intake hole blocking body 13, the other edge 22 projecting outward from the outer peripheral surface of the outer tube 11 is directed toward the one edge 21 from the other edge 22. A plurality of slits (grooves) 23;
Moreover, the boundary part of the edge 22 and the edge 21a; 22a of the soil intake hole obstruction | occlusion body 13 is formed in the chamfering part 20b; 20b.
As shown in FIG. 2A, the slit 23 and the chamfered portion 20 b are configured such that one plate surface 13 a of the soil intake hole blocking body 13 contacts the long side edge 16 a of the opening portion 16 and the soil intake hole 18 is completely formed. When the outer tube is rotated in the direction (one direction A) to maintain the fully open state of the soil intake hole from the fully open state of the soil intake hole, or the soil intake hole blocking body 13 as shown in FIG. The other plate surface 13b contacts the long edge 16b of the opening 16 and the soil intake hole 18 is closed from the fully closed state of the soil intake hole 18 (the other direction in which the soil intake hole is fully closed) When rotating the outer tube 11 in the direction B), the soil resistance received by the soil intake hole blocking body 13 is reduced.

One plate surface 13a side that is in contact with the long side edge 16a of the opening 16 on the other pair of side edges 21a; 22a side of the soil intake hole clogging body 13 is formed from the other plate surface 13b to the one plate surface 13a. It is formed on an inclined surface 20a; 20a inclined toward the center.
As shown in FIG. 2 (b), the inclined surface 20 a is formed from the soil intake hole fully closed state in which the other plate surface 13 b of the soil intake hole closing body 13 is in contact with the long edge 16 b of the opening 16. When the outer tube 11 is rotated in a direction (the other direction B) in which the full hole closed state is maintained, the soil resistance received by the soil intake hole plug 13 is reduced.

  The connecting member 14 formed in a solid rod shape is provided with a connecting member-side cover body 26 attached to the one end opening 25 so as to close the one end opening 25 of the outer tube 11 at one end. The other end portion includes a rod connecting portion 27 that is connected to the tip of the rod portion 5. The connecting member side lid 26 includes an inner tube rotation support portion 31, an inner tube restricting surface 32, and an outer tube connecting portion 33 from one end of the connecting member 14 to the other end. The rod connecting portion 27 is formed on the inner side of the rod so as to extend from the end surface of the other end of the rod forming the connecting member 14 to the one end side, and is formed on the peripheral surface of the tip 5t of the rod portion 5 It is comprised by the internal thread part 35 screwed together with the part 34 (refer FIG. 4). The connecting member 14 includes a flat surface portion 14a for gripping with a tool such as a spanner on the peripheral surface.

  The drawing member 15 is provided with a drawing member side lid 36 attached to the other end opening 25a so as to close the other end opening 25a of the outer tube 11 at one end, and the drawing member 15 is drawn to the other end. The unit 37 is provided. The drawing member side lid 36 includes an inner tube rotation support portion 41, an inner tube restriction surface 42, and an outer tube connection portion 43 from one end of the drawing member 15 toward the other end. The drawing portion 37 includes a hole 38 for connecting a lifting material such as a pulling wire (not shown).

  The connecting member side lid body 26 and the drawing member side lid body 36 have the same configuration. The inner pipe rotation support portions 31; 41 of the lid bodies 26; 36 are formed of a cylindrical body having a diameter smaller than the inner diameter of the inner pipe 12. The inner tube 12 and the outer tube 11 are rotatable relative to each other, and the diameter of the cylindrical body forming the inner tube rotation support portion 31; 41 and the inner tube 12 are set so that the inner tube 12 does not tilt with respect to the central axis a. (For example, the inner tube rotation support portion 31; 41 is set to have a diameter smaller than the inner diameter of the inner tube 12 by several mm). The inner pipe regulating surfaces 32; 42 of the lid bodies 26; 36 are provided around the ends of the connecting member 14 and the extraction member 15 in the cylindrical body forming the inner pipe rotation support portion 31; 41, and the cylindrical body. Is formed by an annular surface orthogonal to the central axis a. The ring width dimension of the annular surface is larger than the difference dimension (thickness dimension of the inner tube 12) between the inner diameter dimension and the outer diameter dimension of the inner tube 12, and the ring width dimension of the annular surface and the inner tube Twelve inner diameter dimensions are set to approximate aptitude values. The outer pipe connecting portions 33; 43 of the lid bodies 26; 36 formed to have the above-described difference dimensions (thickness dimensions of the inner pipe 12) are connected from the outer peripheral edge of the annular surface forming the inner pipe regulating surfaces 32; 42. A cylindrical portion in which the central axis a is formed in the same direction (coaxially) as the inner tube rotation support portions 31 and 41 by extending in the other end direction of the member 14 and the drawing member 15 and an outer peripheral surface formed on the outer peripheral surface of the cylindrical portion. It is formed by the external thread part 40; 40 screwed by the internal thread part 17; 17 formed in the inner peripheral surface of the edge part opening 25; 25a of the pipe | tube 11. As shown in FIG.

  The assembly structure of the soil sampling tube device 3 will be described. One lid body 26 of the lid bodies 26; 36 and one end opening 25 of the outer tube 11 are screw-connected. The column of the inner tube rotation support portion 31 of one lid 26 is inserted (inserted) into the inner side of the tube on the insertion side tip of the inner tube 12 inserted from the other end opening 25a of the outer tube 11. In the state where the cylinder of the inner tube rotation support portion 41 of the other lid body 36 is inserted (inserted) inside the tube at the rear end of the inner tube 12, the other lid body 36 and the other end opening 25a of the outer tube Are screwed together. A soil intake hole blocking body 13 is attached to one long edge 19 of the soil intake hole 18 of the inner tube 12. As described above, when installed in the ground, the soil intake hole blocking body 13 is installed in the ground so that the rotation of the inner tube 12 is regulated and the outer tube 11 is subjected to a rotational force to apply the outer tube. 11 rotates so that the soil intake hole 18 can be opened and closed.

As shown in FIG. 2 (a), when the soil collection tube device 3 rotates the rod portion 5 in the ground and rotates the outer tube 11 in one direction A, one length of the opening 16 is obtained. The edge 16a and one plate surface 13a of the soil intake hole blocking body 13 are in contact with each other, the opening edge of the soil intake hole 18 is located inside the opening edge of the opening 16 and the soil intake hole is fully opened. Become. Thereafter, the outer tube 11 is further rotated in one direction A, so that the outer tube 11 and the inner tube 12 are rotated around the central axis a. As a result, the soil in the ground is pressed by the other plate surface 13 b of the soil intake hole blocking body 13 and taken into the inner tube 12.
Then, after the soil is taken into the inner tube 12, when the outer tube 11 is rotated in the other direction B as shown in FIG. 2 (b), the other long side edge 16b of the opening 16 and the soil collecting are taken. When the other plate surface 13b of the insertion hole closing body 13 comes into contact, the soil intake hole 18 faces the inner peripheral surface of the outer tube 11, and the communication between the internal space of the inner tube 12 and the external space is the soil intake. A state in which the soil intake hole blocked by the inlet hole blocking body 13 is fully closed, and the soil taken into the inner pipe 12 is sealed inside the outer pipe 11 by the outer tube 11 and the soil inlet hole blocking body 13 Thus, it does not flow out into the ground around the outer tube 11.

Using the soil sampling device 1 described above, for example, contaminated soil is collected at a soil collection target position 50 in a subterranean ground such as a machine factory or in a underground ground such as a waste disposal site. How to do it.
First, as shown in FIG. 1, an excavation hole 51 passing through the soil sampling target position 50 is formed using the free curve excavator 2. For example, after excavating the ground in an obliquely downward direction by propelling the excavation bit 6 to the depth position of the soil collection target position, the ground in the horizontal direction by propelling the excavation bit 6 in the horizontal direction. Is drilled to form a drilling hole 51 that passes through the soil sampling target position 50, and then the ground is excavated diagonally upward so that the drilling bit 6 is propelled upward, and the drilling bit 6 is brought out to the ground. .
When excavating the ground diagonally, the excavation bit 6 is rotated by rotating the rod portion 5 with a rotational drive source such as a motor (not shown) provided in the drive device 8 around the central axis of the rod portion 5 as the rotation center. The drill bit 6 is propelled while rotating.
When the propulsion direction of the excavation bit 6 is changed, the rod portion 5 is not rotated, and a propulsive force is applied to the rod portion 5 by a pressing device such as a hydraulic cylinder (not shown) provided in the drive device 8 to By making earth pressure act on the elliptically inclined surface 9, the propulsion direction of the excavation bit 6 is changed. Thereby, the excavation bit 6 and the rod part 5 can be moved to a horizontal direction.
At the time of excavation, since the hollow part in the cylinder of the rod part 5 is used as a supply pipe for the drilling liquid, the rear end of the rod part 5 is connected to a drilling liquid supply device (not shown) and the rod part 5 is rotated. The drilling fluid is pumped and supplied to the drilling bit 6 from the drilling fluid supply device through the hollow portion in the cylinder of the rod portion 5. As the drilling fluid, a stable fluid such as water, bentonite solution, or polymer is used. As a result, the excavation bit 6 excavates the ground while the excavation liquid is jetted from the excavation fluid injection hole 6d (see FIG. 6) of the excavation bit 6 to the ground.
And the excavation hole 51 which passes the soil sampling target position 50 is formed by repeating the operation | movement which adds the rod 5a sequentially as excavation progresses. The position of the excavation bit 6 can be known by the operator from the position information from the position detection sensor 7, and the excavation hole 51 that passes through the soil sampling target position 50 can be formed based on the position information.

  As shown in FIG. 1A, excavation is performed using the free-curve excavator 2 with the soil sampling target position 50 as a target. And the excavation hole 51 which dug the underground which passed the soil sampling target position 50 is formed (refer FIG.1 (b)), Then, it is on the front-end | tip of the rod part 5 pulled out from the excavation end point of the excavation hole 51 to the ground. The attached excavation bit 6 is removed and, instead, the soil sampling pipe device 3 is attached to the tip of the rod portion 5 (see FIG. 1C). Then, with the soil intake hole 18 of the soil collection tube device 3 closed, the soil collection tube device 3 is returned to the excavation start point side via the excavation hole 51 and moved to the soil collection target position 50 (FIG. 1D )reference). When the soil collection pipe device 3 reaches the soil collection target position 50, the outer pipe 11 is rotated in the direction in which the soil intake hole 18 is opened (one direction A), so that the soil at the soil collection target position 50 is taken into the inner pipe. 12 (see FIG. 1D). Thereafter, the outer tube 11 is rotated in the direction in which the soil intake hole 18 is closed (the other direction B), the soil intake hole 18 is closed, and the soil sampling tube device 3 is returned to the excavation start point via the excavation hole 51 to the ground. The soil sampling tube device 3 attached to the tip of the rod portion 5 is removed. And the soil intake hole obstruction | occlusion body 13 is grasped, the inner pipe | tube 12 is rotated in the direction in which the soil intake hole 18 is opened outside, and the soil in the inner pipe 12 is made to pass through the soil intake hole 18 and the opening 16. Take out through. The operator confirms information (azimuth information, distance information, etc.) from the position detection sensor 7 displayed on the monitor (not shown) while excavating the soil collection target position 50, and the soil collection target position 50. The soil sampling operation for taking the soil into the inner pipe 12 is performed.

According to the first embodiment, in the method of collecting the soil at the soil collection target position 50 using the free curve excavator 2, the soil collection tube device 3 including the soil intake hole blocking body 13 is used. The soil collected by the pipe device 3 can be easily taken out by operating the soil intake hole closing body 13 and rotating the inner pipe 12.
According to the first embodiment, since the inner tube rotation support portion 31; 41 is provided, the inner tube 12 can be rotatably supported so as not to incline with respect to the central axis a. Therefore, the rotation operation of the inner tube 12 and the outer tube 11 is performed. And the opening and closing operation of the soil intake hole 18 can be ensured.
According to the first embodiment, since the soil intake hole block 13 includes the inclined surface 20a, when the soil sampling tube device 3 moves in the ground with the soil intake hole 18 closed, the soil intake hole blockage is obtained. The inclined surface 20a of the body 13 receives the earth pressure and acts like a wedge. Thereby, since the rotational force of the direction which obstruct | occludes the soil intake hole 18 is added to the soil intake hole obstruction | occlusion body 13, when the soil sampling pipe apparatus 3 moves in the ground, the soil intake hole fully-closed state is maintained. Therefore, it is possible to prevent the soil intake hole 18 from being opened during the movement of the soil sampling tube device 3. Therefore, soil in the ground other than the soil collection target position 50 is taken into the inner pipe 12, or contaminated soil taken into the inner pipe 12 at the soil collection target position 50 is put into the ground other than the soil collection target position 50. It is possible to prevent the contamination from spreading by spreading.
According to the first embodiment, since the soil intake hole covering body 13 includes the slit 23 and the chamfered portion 20b, the soil intake hole closing body 13 is rotated when the outer tube 11 is rotated to open and close the soil intake hole 18. Since the earth resistance that is received is reduced, the rotational load of the outer tube 11 can be reduced.
According to the first embodiment, the soil can be collected not only by the horizontal excavation path by the free curve excavator 2 but also by the curvilinear excavation path. Therefore, it is possible to collect the soil at the soil collection target position 50 wherever the soil collection target position 50 is.
According to the first embodiment, since the soil at the soil collection target position 50 in the excavation route after excavation by the free-curve excavator 2 is collected, the soil with reduced moisture due to excavation can be collected. Compared to 1, the soil component can be surveyed more accurately.

  In the first embodiment, one edge 21 side of the soil intake hole closing body 13 and one long edge 19 side of the soil intake hole 18 are connected to one edge of the soil intake hole closing body 13. If the bracket provided on 21 is connected to the peripheral surface of the inner tube 12 with bolts or the like, the soil intake hole blocking body 13 is removed when the soil taken into the inner tube 12 is taken out. After that, by removing one of the connecting member side lid body 26 and the drawing member side lid body 36 from the outer tube 11, the inner tube 12 is connected to the outer tube 11 through the end opening of the outer tube 11. Can be pulled out. Therefore, since the soil in the inner pipe 12 can be taken out through the end openings at both ends of the inner pipe 12, the soil collected by the soil collecting pipe device 3 can be taken out more easily.

Embodiment 2
As shown in FIG. 5, the excavation bit 6 provided at the tip 5t of the rod portion 5 of the free curve excavator 2 excavates from the excavation start point to the soil sampling target position 50 (see FIGS. 5A and 5B). ). Then, after returning the excavation bit 6 to the excavation start point and taking it out to the ground, the excavation bit 6 is detached from the tip 5t of the rod part 5, and the soil sampling pipe device 3 is attached to the tip 5t of the rod part 5, and the soil sampling pipe A drill bit 6 is attached to the tip of the device 3 (see FIG. 5C). Then, the excavation bit 6 and the soil collection pipe device 3 are returned to the soil collection target position 50 via the excavation hole 51 and the soil at the soil collection target position 50 is taken into the inner pipe 12 of the soil collection pipe device 3 (FIG. 5). (See (d)). Thereafter, the soil sampling tube device 3 is returned to the excavation start point, and the soil inside the soil sampling tube device 3 is taken out. Also in the case of the second embodiment, the operator confirms information (azimuth information, distance information, etc.) from the position detection sensor 7 displayed on the monitor (not shown), and excavation work to the soil collection target position 50, and Then, a soil collection operation for taking the soil at the soil collection target position 50 into the inner pipe 12 is performed.
In addition, the soil sampling tube apparatus 3 used in Embodiment 2 uses what was provided with 15 A of bit side connection parts as shown in FIG. 6 instead of the drawing member 15 mentioned above. 15 A of bit side connection parts have the cover body 15X similar to the said extraction member side cover body 36 attached to the said other end part opening 25a so that the other end part opening 25a of the outer tube | pipe 11 may be plugged up in one end part. And the other end portion is provided with a bit connecting portion 55. The bit connecting portion 55 is formed by a male screw portion 57 that is screwed to a female screw portion 56 formed on the inner peripheral surface of the pipe at the rear end portion of the excavation bit 6.
In the case of the second embodiment, the excavation bit 6 is excavated in order to supply the excavation liquid into the ground in front of the excavation bit 6 in the configuration in which the soil sampling pipe device 3 and the excavation bit 6 are attached to the tip 5t of the rod portion 5. The connecting member 14 and the bit side connecting portion 15A provided with the drilling fluid supply passage for communicating the liquid supply passage 6e with the internal space 5u of the rod portion 5 used as the drilling fluid supply passage are used. In other words, the connecting member 14 is provided with a drilling fluid supply passage 14e communicating with the internal space 5u of the rod portion 5 and the internal space of the inner tube 12, and the bit side connecting portion 15A includes the inner tube 12 of the inner tube 12. The one provided with the drilling fluid supply passage 15e communicating with the internal space and the drilling fluid supply passage 6e of the drilling bit 6 is used. In the middle of the drilling fluid supply passage 15e, a check valve 15f for preventing the groundwater from flowing into the inner space of the inner pipe 12 via the drilling fluid supply passage 6e of the drilling bit 6 is provided. . From the viewpoint of ease of mounting of the check valve 15f, it is preferable to provide the check valve 15f at either one of both ends of the drilling fluid supply passage 15e of the bit side connecting portion 15A. When the check valve 15f is provided on the inner pipe 12 side in the drilling fluid supply passage 15e of 15A, the soil taken inside the inner pipe 12 enters the check valve 15f and induces a failure of the check valve 15f. there is a possibility. Therefore, in the second embodiment, a check valve mounting portion is provided at the end of the drilling fluid supply passage 15e of the bit side connecting portion 15A on the drilling bit 6 side, and the check valve 15f is mounted on the check valve mounting portion. The configuration was as follows.
With the above configuration, during excavation, the excavating liquid is supplied to the inner space 5u of the rod portion 5, the excavating liquid supply path 14e, the inner space of the inner pipe 12, the excavating liquid supply path 15e, the drilling liquid supply path 6e, the drilling liquid. It is supplied into the front ground of the excavation bit 6 via the injection hole 6d. When the drilling fluid is not supplied, the check valve 15f prevents the groundwater from flowing into the inner space of the inner pipe 12.
According to the method according to the second embodiment, the same effect as that of the first embodiment can be obtained, and soil can be collected even at a site where the underground cannot be dug.

Embodiment 3
As the soil sampling tube device 3 used in Embodiments 1 and 2, a device having a lock unit 60 as shown in FIGS. 7 and 8 is used. In order to maintain the state where the soil intake hole 18 is blocked by the contact between the soil intake hole blocking body 13 and the opening edge of the opening 16 of the outer tube 11, the lock unit 60 It is formed by a groove 62 into which an edge 61 formed on the inclined surface 20a of the body 13 enters. The groove 62 is formed at the boundary between the long side edge 16b of the opening 16 and the short side edge 63 of the opening 16 located on the other end opening 25a side of the outer tube 11, and the long side An extended edge 65 extending straight from the edge 16b to the long edge 16b, an opposing edge 66 facing in parallel with the extended edge 65, and a groove connecting the distal end of the extended edge 65 and the distal end of the opposed edge 66 And a bottom edge 67 forming the bottom. The width dimension of the groove 62 approximated the thickness dimension of the soil intake hole blocking body 13 so that the soil intake hole blocking body 13 that entered the groove 62 would not move and rattle in the circumferential direction of the outer tube 11. It is set to an appropriate value (for example, the width dimension of the groove 62 is set to be about several mm larger than the thickness dimension of the soil intake hole blocking body 13).
According to the third embodiment, when the outer tube 11 is rotated in the other direction B, the other long side edge 16b of the opening 16 and the other plate surface 13b of the soil intake hole blocking body 13 are in contact with each other. In this state, the soil intake hole is fully closed, and in this soil intake hole fully closed state, the rod portion 5 is pulled toward the excavation start end side and the outer tube 11 is pulled toward the excavation start end side. Since the edge portion 61 formed on the inclined surface 20a enters the groove 62 (see FIG. 8B), the soil intake hole blocking body 13 is prevented from rotating in the circumferential direction of the outer tube 11, and thus soil sampling The pipe device 3 is locked in the soil intake hole fully closed state.
According to the third embodiment, since the outer tube 11 includes the lock portion 60, when the soil sampling tube device 3 is moved in the ground, the soil intake hole fully closed state can be maintained, and the soil sampling tube device 3 is moving. It is possible to prevent the soil intake hole 18 from being opened. Therefore, soil in the ground other than the soil collection target position 50 is taken into the inner pipe 12, or contaminated soil taken into the inner pipe 12 at the soil collection target position 50 is put into the ground other than the soil collection target position 50. It is possible to prevent spreading and spreading the contamination. According to the third embodiment, the effect can be obtained even if the soil intake hole blocking body 13 does not include the inclined surface 20a.
In addition, as the soil sampling tube device 3 used in Embodiment 2, when the soil sampling tube device 3 is moved from the excavation start point to the soil sampling target position 50, the soil sampling tube device 3 is locked in the soil intake hole fully closed state. It is preferable to provide the lock part 60a comprised by the groove | channel 62a for this. The groove 62a in this case is formed at the boundary between the long side edge 16b of the opening 16 and the short side edge 63a of the opening 16 located on the one end opening 25 side of the outer tube 11, for example. The extended edge 65a that extends in a straight line from the long edge 16b to the long edge 16b, the opposite edge 66a that faces the extended edge 65a in parallel, the distal end of the extended edge 65a, and the distal end of the opposed edge 66a And a bottom edge 67a that forms a groove bottom. In this case, by pushing the rod portion 5 and pushing the outer tube 11 in the soil intake hole fully closed state, the edge portion 61a formed on the inclined surface 20a of the soil intake hole closing body 13 enters the groove 62a, Since the soil intake hole blocking body 13 does not rotate in the circumferential direction of the outer tube 11, the soil sampling tube device 3 is locked in the fully closed state of the soil intake hole. Therefore, it is possible to prevent the soil intake hole 18 from being opened during the movement of the soil sampling tube device 3.
In addition, as shown by the imaginary line in FIG. 7, the opposing edge 66; 66a is inclined with respect to the extended edge 65; 65a (inclination such that the bottom edge 67; 67a is directed toward the center of the opening 16). If it forms in an edge | edge, the entrance / exit of the soil intake hole obstruction | occlusion body 13 with respect to the groove | channel 62a becomes easy, and the reliability of the lock | rock operation | movement by the groove | channel 62a and the soil intake hole obstruction | occlusion body 13 and unlocking | release operation increases.

Embodiment 4
As shown in FIG. 9, if the soil collection pipe device 3 in which the communication groove 70 that communicates one end opening of the outer pipe 11 and the opening 16 is formed on the peripheral surface of the outer pipe 11, the soil uptake is used. Since the inner pipe 12 with the hole closing body 13 attached can be taken in and out of the outer pipe 11 through one of the end openings of the outer pipe 11, the soil collected by the soil collection pipe device 3 can be taken out more easily. It becomes like this.

  Although the soil sampling tube device 3 according to Embodiments 3 and 4 described in FIGS. 7 to 9 can be used in any of the methods of Embodiments 1 and 2, it has been described in Embodiment 1 in FIGS. An example of a soil sampling tube device 3 of the type provided with a drawing member 15 is shown.

Embodiment 5
In the first embodiment, after the soil at the soil collection target position 50 is collected by the soil collection pipe device 3, the soil collection pipe device 3 is pulled back to the excavation start point side of the excavation hole 51 and pulled out to the ground from the opening of the excavation start point. After the soil at the sampling target position 50 is collected by the soil sampling pipe device 3, the soil sampling pipe device 3 may be pushed forward to the excavation end point side of the excavation hole 51 and pushed out to the ground from the opening of the excavation end point. The method according to the fifth embodiment is effective when the distance from the soil collection target position 50 to the excavation end point is shorter than the distance from the soil collection target position 50 to the excavation start point.

  In Embodiments 1; 2; 5, in the case where the soil intake hole blocking body 13 is configured not to include the inclined surface 20a, the soil sampling tube device 3 is connected to the ground when the outer tube 11 does not include the lock portion 60; 60a. When moving in, the soil collection tube device 3 is closed with the soil intake hole 18 closed, and the outer tube 11 is rotated in the direction (the other direction B) in which the soil intake hole 18 is closed. The device 3 may be moved. Thereby, it is possible to prevent the soil intake hole 18 from being opened during the movement of the soil sampling tube device 3.

  As shown in FIG. 6, the soil collection target position is obtained by excavating from the excavation start point to the soil collection target position 50 using the soil collection device 1 having the soil collection pipe device 3 between the excavation bit 6 and the rod portion 5. After collecting 50 soils with the soil sampling pipe device 3, the soil sampling device 1 is pulled back to the opening of the excavation starting point and the soil sampling pipe device 3 is put out on the ground through the opening of the excavation starting point, or the soil sampling device 1 You may make it take out the inside and take out the soil sampling pipe apparatus 3 on the ground. At this time, in the case of using the soil collection tube device 3 that does not include the lock portion 60; 60a, the direction in which the soil intake hole 18 is closed with the soil intake hole 18 of the soil collection tube device 3 closed (the other direction). B) may be excavated while rotating the combined body of the rod part 5, the soil sampling pipe device 3 and the excavation bit 6. Thereby, it is possible to prevent the soil intake hole 18 from being opened during the movement of the soil sampling tube device 3. In this case as well, the operator confirms information (direction information, distance information, etc.) from the position detection sensor 7 displayed on the monitor (not shown), and excavation work to the soil collection target position 50 and soil A soil sampling operation for taking the soil at the sampling target position 50 into the inner pipe 12 is performed.

  It is preferable to provide a watertight performance maintaining member such as a packing for improving the watertight performance of the inner pipe 12 in the soil intake hole fully closed state. The watertight performance maintaining member is, for example, a contact portion between the other long side edge 16b of the opening portion 16 and the other plate surface 13b of the soil intake hole blocking body 13, an outer periphery around the opening edge of the opening portion 16 of the outer tube 11. The inner surface of the pipe, the outer surface of the inner pipe around the edge of the soil intake hole 18 of the inner pipe 12, the contact portion between the lid 26;

Both or one of the lid bodies 26; 36 may be attached to the open end surface of the outer tube 11 by welding.
The shapes of the opening 16, the soil intake hole 18, and the soil intake hole blocking body 13 described above may be formed other than the shapes described in the above embodiment. What is necessary is just the structure which can be in the state (full closed state) where the plate surface 13b and the other long side edge 16b contact, and the soil intake hole 18 is block | closed.
The male screw portion described above may be a female screw portion, and the female screw portion and the male screw portion described above may be used.

  The present invention is not only for collecting soil-contaminated soil, but also for investigating whether or not a predetermined amount of improvement material is contained in a place where the ground has been improved by improvement material such as cement. It can also be used when collecting soil to measure the amount of the substance to be investigated.

2 Free-curve excavator, 3 soil sampling pipe device, 5 rod section, 6 excavation bit,
11 Outer tube, 12 Inner tube, 13 Soil uptake block,
16 opening part, 16b other long side edge (opening edge),
26 connecting member side lid (lid), 36 drawer member side lid (lid),
50 soil sampling target position, 51 excavation hole, 60 lock part.

Claims (3)

The excavation bit provided at the tip of the rod part of the free-curved excavator digs into the ground from the excavation start point via the soil sampling target position and puts the excavation bit on the ground, and then the excavation bit from the tip of the rod part And attach the soil sampling pipe device to the tip of the rod part, return the soil sampling pipe device to the soil sampling target position through the excavation hole dug out of the ground, and place the soil sampling target position inside the soil sampling pipe device The soil sampling pipe device is taken out to the ground by pulling the soil sampling pipe device back to the excavation start point of the excavation hole, or pushed to the end point of excavation of the excavated drill hole and taken out to the ground. An underground soil collection method for taking out the soil taken in the interior of the soil,
The soil sampling pipe device is installed in the outer pipe that has an opening on the peripheral surface and can receive a rotational driving force via the rod part and can rotate around the central axis as the center of rotation, and coaxially with the central axis of the outer pipe The inner pipe having a soil intake hole on the peripheral surface, and the outer pipe through the opening of the outer pipe from the hole edge extending in the direction along the central axis of the inner pipe in the soil intake hole of the inner pipe When the outer pipe is rotated in one direction in the ground, with a soil intake hole plug provided so as to protrude outward from the outer peripheral surface, and lids that block the opening at both ends of the outer pipe, When the soil intake hole communicates with the ground through the opening and the outer tube is rotated in the other direction in the ground, it extends in the direction along the central axis of the outer tube at the opening of the outer tube. An underground soil collection method characterized in that an opening edge and a soil intake hole blocking body are in contact with each other to close the soil intake hole. After drilling from the excavation start point to the soil sampling target position with the excavation bit provided at the tip of the rod part of the free-curved excavator, returning the excavation bit to the excavation start point and taking it out to the ground, the excavation bit from the tip of the rod part And attach the soil sampling pipe device to the tip of the rod part, attach the excavation bit to the tip of the soil sampling pipe device, return the excavation bit and the soil sampling pipe device to the soil sampling target position via the inside of the excavation hole It is an underground soil sampling method in which the soil sampling pipe device is taken back into the excavation start point after taking the soil at the soil sampling target position into the sampling tube device, and the soil inside the soil sampling tube device is taken out,
The soil sampling pipe device is installed in the outer pipe that has an opening on the peripheral surface and can receive a rotational driving force via the rod part and can rotate around the central axis as the center of rotation, and coaxially with the central axis of the outer pipe The inner pipe having a soil intake hole on the peripheral surface, and the outer pipe through the opening of the outer pipe from the hole edge extending in the direction along the central axis of the inner pipe in the soil intake hole of the inner pipe When the outer pipe is rotated in one direction in the ground, with a soil intake hole plug provided so as to protrude outward from the outer peripheral surface, and lids that block the opening at both ends of the outer pipe, When the soil intake hole communicates with the ground through the opening and the outer tube is rotated in the other direction in the ground, it extends in the direction along the central axis of the outer tube at the opening of the outer tube. An underground soil collection method characterized in that an opening edge and a soil intake hole blocking body are in contact with each other to close the soil intake hole.   The soil sampling tube device includes a lock portion that maintains a state in which the soil intake hole is closed by contact between the soil intake hole blockage body and the opening edge of the opening of the outer tube. The underground soil collection method according to claim 1 or claim 2.

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