JP2022084438A - Laying method and laying device - Google Patents

Abstract

To provide a laying method and a laying device for reducing the amount of soil discharged when laying an object in the ground.SOLUTION: A laying method is a method of laying a predetermined target member by embedding it in the ground, and comprises a first step of inserting the target member into the ground G while excavating the ground G by traveling an excavation chain 11 on a predetermined excavation track 31 along the circumference of the target member, and a second step of leaving the target member in the ground G after the target member reaches a predetermined depth.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a laying method and a laying device.

Conventionally, a method of excavating a boring hole for laying a target member by embedding it in the ground has been known. For example, in the freezing method described in Patent Document 1 below, a boring hole is excavated in the ground, a freezing pipe is laid in the boring hole, and the ground in a predetermined range is frozen.

Japanese Patent No. 2743954

In the laying method as described above, it is necessary to form a relatively large boring hole in the target member in order to stably insert and install the target member in the boring hole. That is, it is necessary to excavate the ground in a slightly wider area than the target member to be laid, and for this reason, it is difficult to lay the target member in a narrow place. Therefore, an object of the present invention is to provide a laying method and a laying device that enable the target member to be laid in the ground in a narrow place.

The laying method of the present invention is a method of embedding a predetermined target member in the ground and laying the target member while excavating the ground by running an excavation chain on a predetermined excavation track along the circumference of the target member. It is provided with a first step of inserting the target member into the ground and a second step of leaving the target member in the ground after the target member reaches a predetermined depth.

According to this laying method, the target member is inserted into the ground while excavating the ground around the target member by an excavation chain traveling on the excavation track. Since it is not necessary to widen the excavation area to allow a margin as in the case of inserting the target member after excavating the ground, according to this laying method, the target member is laid in the ground in a narrow place. be able to.

The target member may have a member main body and a guide frame that surrounds the member main body, holds the member main body inside, and includes a guide portion on the outside that guides the traveling of the excavation chain on the excavation track. .. In the first step, the target member is inserted into the ground by pushing the guide frame toward the ground while the excavation chain is running, and the extension frame that extends the guide frame is added to the guide frame. And may be executed. According to this laying method, the target member can be inserted into the ground by the process of pushing the guide frame.

In the second step, the excavation chain may be pulled out of the ground along the excavation track and recovered. According to this laying method, the excavation chain can be recovered from the ground after the target member is left.

In the laying method of the present invention, the target member may be a long plate-shaped member whose longitudinal direction is the insertion direction into the ground. The excavation track of the excavation chain extends along the pair of side surface portions extending in the longitudinal direction along the edges of both ends in the plate width direction of the target member and the edge of the tip in the insertion direction of the target member. It may have a tip portion that connects the side surface portions to each other. According to this laying method, a long plate-shaped target member can be laid in the ground.

The laying method of the present invention is a laying method in which a target member is laid in the ground along an existing structure provided in the ground, and the excavation chain drives a chain drive unit installed outside the ground. The track of the excavation chain running as a source and around the chain drive may be farther from the existing structure than the excavation track. According to this laying method, it is possible to prevent the chain drive unit and the existing structure from interfering with each other.

The laying device of the present invention is a device for laying a predetermined target member by embedding it in the ground, and is an excavation chain that travels on a predetermined excavation track along the circumference of the target member to excavate the ground and the target member. And an insertion drive unit for inserting the excavation chain into the ground together.

According to this laying device, the target member can be laid in the ground in a narrow place, similar to the laying method described above.

According to the present invention, it is possible to provide a laying method and a laying device capable of laying a target member in a ground in a narrow place.

(A) is a schematic view showing a flow path inside a freezing tube which is an example of a target member, and (b) is a cross-sectional view of the freezing tube of (a) seen from an insertion direction, (c). Is a cross-sectional view of the ground on which the freezing pipe of (a) is laid. It is a side view of the laying apparatus which concerns on embodiment. (A) is an enlarged view of a freezing member and an excavation chain, and (b) is a cross-sectional view of (a) seen from an insertion direction. It is a front view of the laying apparatus which concerns on embodiment. It is a front view which shows the 1st process of excavating the ground. It is a front view which shows the process of adding an extension frame in 1st process. It is a front view which shows the process of pulling out the excavation chain out of the ground and collecting it in the 2nd step. It is an enlarged view which shows the deformation example of the excavation chain. It is a side view which shows the modification of the laying apparatus.

Hereinafter, the laying method and the laying device according to the embodiment of the present invention will be described with reference to the drawings. In the following description, the same or equivalent elements are designated by the same reference numerals, and duplicate explanations will not be repeated. The dimensional ratios in the drawings do not always match those described.

[Freezing method]
In the laying method and the laying device according to the embodiment of the present invention, a freezing method for laying a freezing pipe will be described as an example of a method of laying a predetermined target member by embedding it in the ground. The freezing method according to the present embodiment includes a step of embedding a freezing pipe in the ground and laying the ground, and then a step of freezing the ground by circulating a refrigerant in the freezing pipe.

FIG. 1A is a schematic view showing a flow path F inside the freezing pipe 21 applied to the freezing method. The freezing tube 21 according to the present embodiment has a long plate shape. In the following, as shown in each figure, the longitudinal direction of the freezing tube 21 is the Z direction, the plate width direction of the freezing tube 21 is the X direction, and the plate thickness direction of the freezing tube 21 is the Y direction. The longitudinal direction (Z direction) of the freezing tube 21 is the insertion direction into the ground G. In the present embodiment, the freezing pipe 21 is inserted vertically downward with respect to the ground G. The freezing tube 21 is formed of, for example, an extruded metal such as aluminum. The length of the freezing tube 21 in the longitudinal direction is, for example, 2 to 30 m, and may be about 100 m at the maximum. Further, as shown in the cross-sectional view seen from the insertion direction of FIG. 1 (b), the plate width (dimension in the X direction) of the freezing tube 21 is, for example, 50 mm, and the plate thickness (dimension in the Y direction) is, for example, 5 mm. Is. The freezing tube 21 has flexibility and is easy to bend and stretch. The freezing tube 21 can be wound in a roll shape and can be linearly stretched from the rolled state.

As shown in FIG. 1 (b), the freezing tube 21 has a flow path F inside. As shown in FIG. 1A, the flow path F inside the freezing pipe 21 includes a flow path F1 for introducing the refrigerant L into the freezing pipe 21 and a flow path for discharging the introduced refrigerant L. Including F2. In the present embodiment, the freezing pipe 21 is provided with six flow paths, the three flow paths on the right side are the flow paths F1 for introducing the refrigerant L into the freezing pipe 21, and the three flow paths on the left side are introduced. It is a flow path F2 for discharging the generated refrigerant L. The refrigerant L circulates inside the freezing pipe 21 to cool the freezing pipe 21 and the ground G around the freezing pipe 21. The refrigerant L is, for example, liquefied carbon dioxide.

FIG. 1 (c) is a cross-sectional view of the ground G on which the freezing pipe 21 is laid. The refrigerant L circulates in each freezing pipe 21 by a circulation pump (not shown). A pipe P1 for introducing the refrigerant L and a pipe P2 for discharging the refrigerant L are connected to each of the freezing pipes 21. The refrigerant L introduced into the freezing pipe 21 cools the surroundings by the heat of vaporization. The refrigerant L discharged from the freezing pipe 21 is cooled by a cooler (not shown) and introduced into the freezing pipe 21 again. The ground G around the freezing pipe 21 changes to frozen soil when the water contained in the ground G freezes. As shown in FIG. 1 (c), in the freezing method of the present embodiment, a plurality of freezing pipes 21 are laid at predetermined intervals. The ground G around the plurality of freezing pipes 21 is connected with frozen soil along the direction (X direction) in which the freezing pipes 21 are laid to form the frozen soil wall I. In the freezing method of the present embodiment, the frozen soil wall I is formed to stop water from entering a predetermined range.

[Laying device]
In such a freezing method, a laying device 1 for laying a freezing member 2 (corresponding to a member subject to claims) and a laying method executed by using the laying device 1 will be described. The freezing member 2 has the above-mentioned freezing tube 21 and a guide frame 22 (see FIG. 3) that holds the freezing tube 21 and is finally left in the ground G together with the freezing tube 21. Details of the freezing member 2 and the guide frame 22 will be described later. FIG. 2 is a side view of the laying device 1 according to the embodiment as viewed from the X direction side. As shown in FIG. 2, the laying device 1 includes a main body portion 10 capable of self-propelling on the ground G by a crawler or the like, an excavation chain 11 arranged on the front side of the main body portion 10, an insertion drive portion 12, and an insertion drive portion 12. A chain drive unit 13 is provided. The chain drive unit 13 is equipped with, for example, an electric motor to drive the excavation chain 11. The excavation chain 11 driven by the chain drive unit 13 excavates the ground G by traveling on a predetermined excavation track 31 along the periphery of the freezing member 2. The excavation track 31 is a track along the periphery of the freezing member 2. The insertion drive unit 12 inserts the freezing member 2 and the excavation chain 11 into the ground G by pushing them downward (downward in the Z direction) together. In the present embodiment, the freezing pipe 21 of the freezing member 2 is arranged in the rear part of the main body 10 of the laying device 1 in a state of being wound up in a roll shape, and is inserted into the ground G while being linearly stretched. Details of the excavation chain 11, the excavation track 31, the insertion drive unit 12, and the chain drive unit 13 will be described later.

FIG. 3A is an enlarged view of the tip portion of the freezing member 2 and the excavation chain 11 in the insertion direction, which is enlarged when viewed from the Y direction side (front). The excavation chain 11 has, for example, a chain portion 11a and an excavation portion 11b. The chain portion 11a is an annular movable part formed by connecting a plurality of movable parts. The chain portion 11a orbits along a predetermined track including the excavation track 31 with the chain drive section 13 as a drive source. The excavated portion 11b is a claw-shaped part provided in the chain portion 11a at a predetermined interval. The excavation portion 11b is provided on the chain portion 11a so as to be arranged on the outer peripheral side of the track. The orbiting excavation portion 11b scrapes the ground G and discharges the scraped ground G to the outside of the ground G.

As described above, in the present embodiment, the freezing member 2 has a freezing tube 21 (corresponding to a member main body within the scope of claims) and a guide frame 22. The guide frame 22 is a rod-shaped rigid member that surrounds the freezing tube 21. In the present embodiment in which the freezing tube 21 forms a long plate, the guide frame 22 extends along the side surface portion of the freezing tube 21 and the tip portion in the insertion direction of the freezing tube 21. The side surface portion is a pair of portions extending in the longitudinal direction (insertion direction) along the edges of both ends of the freezing tube 21 in the plate width direction (X direction). The tip portion is a portion that extends along the edge portion of the tip of the freezing tube 21 in the insertion direction and connects the side surface portions to each other. The guide frame 22 surrounds the freezing tube 21 by extending in the longitudinal direction along the side surface portion and bending in a U shape along the tip portion.

FIG. 3B is a cross-sectional view of the freezing member 2 and the excavation chain 11 as viewed from the insertion direction. As shown in FIG. 3B, the guide frame 22 holds the freezing tube 21 inside. The guide frame 22 holds the freezing tube 21 inside by sandwiching the freezing tube 21 with the holding member 23, for example. The freezing tube 21 wound up in a roll shape is held by the guide frame 22 and is stretched in a straight line.

The guide frame 22 includes a guide portion 22a on the outside. As shown in FIG. 3A, the guide portion 22a guides the excavation chain 11 to travel on the excavation track 31. Specifically, as shown in FIG. 3B, the convex portion of the guide portion 22a and the concave portion inside the excavation chain 11 are combined so that the excavation chain 11 has the convex portion of the guide portion 22a. Guided by, it runs on the excavation track 31. In other words, the excavation track 31 of the excavation chain 11 is along the guide portion 22a of the guide frame 22. Like the guide frame 22, the excavation track 31 has a side surface portion 31a and a tip portion 31b (see FIG. 3A). The side surface portion 31a is a pair of portions extending in the longitudinal direction (insertion direction) along the edges of both ends of the freezing tube 21 in the plate width direction. The tip portion 31b is a portion extending along the edge portion of the tip of the freezing tube 21 in the insertion direction and connecting the side surface portions 31a to each other. At the tip portion 31b, the excavation track 31 curves in a U shape along the guide frame 22.

FIG. 4 is a front view of the laying device 1 before starting the laying method. As described above, the laying device 1 includes an excavation chain 11, an insertion drive unit 12, and a chain drive unit 13. The chain drive unit 13 is installed above the main body unit 10 and is located outside the ground G. The chain drive unit 13 is a drive source for the excavation chain 11. In the present embodiment, the chain drive unit 13 is fixed to the upper surface of the insert drive unit 12. The chain drive unit 13 includes, for example, an electric motor. The chain drive unit 13 drives the excavation chain 11 in an orbit 32 around the chain drive unit 13. The orbit 32 is, for example, an orbit along the circumference of the rotation axis of the electric motor. In this case, the excavation chain 11 obtains a driving force by engaging with the gear of the rotating shaft in the track 32. The excavation chain 11 orbits in a predetermined orbit including the orbit 32 and the excavation orbit 31.

The insertion drive unit 12 is a drive unit that moves up and down with respect to the ground G. The insertion drive unit 12 is, for example, a pedestal that moves up and down with respect to the main body unit 10 by a hydraulic jack. The upper end of the guide frame 22 is held on the front surface of the insertion drive unit 12, and the chain drive unit 13 is fixed on the upper surface of the insert drive unit 12 as described above. When the insertion drive unit 12 moves up and down, the chain drive unit 13 and the guide frame 22 move up and down together with respect to the main body unit 10. At the start of the laying work, the insertion drive unit 12 holds the guide frame 22 of the freezing member 2 after moving to the upper end of the movable range. At this time, the lower end of the excavation chain 11 on the guide frame 22 is located directly above the ground G.

[How to lay]
Next, the laying method executed by using the laying device 1 will be described with reference to FIGS. 5 to 7. First, the first step is performed. FIG. 5 is a front view showing a first step of inserting the freezing member 2 into the ground G while driving the excavation chain 11 to excavate the ground G. In the first step, the insertion drive unit 12 moves downward while holding the guide frame 22 of the freezing member 2. The excavation chain 11 comes into contact with the ground G while traveling on the excavation track 31 along the circumference of the guide frame 22. The excavation chain 11 in contact with the ground G excavates the ground G around the guide frame 22. Specifically, the traveling excavation chain 11 scrapes the ground G in the insertion direction at the tip portion 31b of the excavation track 31, and discharges the ground G scraped off at the side surface portion 31a of the excavation track 31 to the outside of the ground G. By doing so, the ground G is excavated.

In the first step, the freezing member 2 is inserted into the ground G while excavating the ground G with the excavation chain 11 as described above. Specifically, with the excavation chain 11 running, the insertion drive unit 12 is lowered with respect to the main body portion 10 and the guide frame 22 of the freezing member 2 is pushed toward the ground G to push the freezing member 2 to the ground. The process of inserting into G is performed. The insertion drive unit 12 inserts the freezing member 2 and the excavation chain 11 together into the ground G.

Then, when the insertion drive unit 12 reaches the lower end of the movable range, the insertion drive unit 12 and the excavation chain 11 are temporarily stopped, and the lengths of the guide frame 22 and the excavation chain 11 are extended. FIG. 6 is a front view showing a process of adding the extension frame 24 in the first step. The extension frame 24 is a component that extends the guide frame 22 in the insertion direction. The extension frame 24 has, for example, a length comparable to the vertical movable range of the insertion drive unit 12. In the present embodiment, the process of adding the extension chain 14 is also executed. The extension chain 14 is a component that extends the excavation chain 11. The extension chain 14 also has, for example, a length similar to the vertical movable range of the insertion drive unit 12.

The process of adding the extension frame 24 is executed after the process of inserting the freezing member 2 into the ground G. In the present embodiment, first, the guide frame 22 is separated into a lower portion including the tip portion 31b inserted into the ground G and an upper portion held by the insertion drive portion 12. The excavation chain 11 is also separated in the same manner as the guide frame 22. Next, the insertion drive unit 12 moves to the upper end of the movable range. The upper part and the lower part of the guide frame 22 and the excavation chain 11 are separated from each other at separated positions. Finally, an extension frame 24 is added between the upper part and the lower part of the separated guide frame 22. Similarly, an extension chain 14 is added between the upper part and the lower part of the separated excavation chain 11.

After executing the process of adding the extension frame 24, the insertion drive unit 12 is located at the upper end of the movable range. Further, the guide frame 22 is held by the insertion drive unit 12 with the tip end side inserted into the ground G. Therefore, by pushing the guide frame 22 of the freezing member 2 toward the ground G, the process of inserting the freezing member 2 into the ground G can be executed again. As a result, by repeatedly executing the process of adding the extension frame 24 and the process of inserting the freezing member 2 into the ground G, in the first step, the freezing member reaches a predetermined depth planned in advance. 2 is inserted into the ground G.

After the first step, the second step is carried out. In the second step, after the freezing member 2 reaches a predetermined depth, the freezing member 2 is left in the ground G. In the present embodiment, as shown in FIG. 7, in the second step, a process of pulling out the excavation chain 11 from the ground G to the outside of the ground G along the excavation track 31 and collecting the excavation chain 11 is further performed. Specifically, when the chain drive unit 13 is driven in a state where the excavation chain 11 is separated at one location above the ground G, the excavation chain 11 is pulled by the chain drive unit 13 and along the excavation track 31. As it travels, it is pulled out of the ground G from the ground G and collected. This completes the laying method.

The present invention can be carried out in various forms having various changes and improvements based on the knowledge of those skilled in the art, including the above-mentioned embodiment. It is also possible to construct a modified example by utilizing the technical matters described in the above-described embodiment. The configurations of the respective embodiments may be combined and used as appropriate.

[Modification example]
FIG. 8 is an enlarged view showing a modified example of the excavation chain 11. The enlarged view of FIG. 8 enlarges a modified example of the excavation chain 11 around the chain drive unit 13. According to the modification of the excavation chain 11, in the process of adding the extension frame 24, it is not necessary to execute the process of adding the extension chain 14. A modified example of the excavation chain 11 is a track 32 along the periphery of the chain drive unit 13, the first support shaft 41, the second support shaft 42, the third support shaft 43, the fourth support shaft 44, and the fifth support shaft 45. To drive. The first to fifth support shafts are rotation shafts that are rotatably provided. The first to fifth support shafts are provided in the insertion drive unit 12. The excavation chain 11 travels in a state where it is loosely hooked on the rotation shaft of the chain drive unit 13 and the support shafts 1 to 5.

In this modification, the rotation shafts of the first to third fulcrums are provided so as to be movable toward the chain drive unit 13. For example, a moving mechanism for moving the first to third support shafts toward the chain drive unit 13 is provided. In the process of adding the extension frame 24, when the insertion drive unit 12 moves upward, the excavation track 31 is extended between the lower part and the upper part of the guide frame 22. Since the total length of the excavation chain 11 is constant, the orbit 32 is tightened by extending the excavation track 31. The rotation axes of the first to third fulcrums move toward the chain drive unit 13 so that the track 32 becomes smaller in accordance with the tightening of the track 32. The track 32 along the periphery of the chain drive unit 13 and the fulcrums 1 to 5 is reduced by the movement of the fulcrums 1 to 3 toward the chain drive unit 13. As described above, by reducing the track 32, it is possible to execute the process of adding the extension frame 24 without executing the process of adding the extension chain 14.

FIG. 9 is a side view of a modified example of the laying device as viewed from the X direction side. In the laying device 1A of this modification, the freezing member 2 is laid in the ground G at the position closest to the existing structure S provided in the ground G. The existing structure S is, for example, a building in which a foundation is provided in the ground G and is built from the foundation toward the outside of the ground G. The laying device 1A of this modification forms the frozen soil wall I adjacent to the foundation of the building by laying the freezing member 2 in the ground G along the building.

In the laying device 1A of this modification, the track 32 of the excavation chain 11 around the chain drive unit 13 is provided at a distance from the existing structure S as compared with the excavation track 31 in the ground G. Further, the chain drive unit 13 is provided at a distance from the existing structure S as compared with the excavation track 31. For example, the excavation track 31 is provided along the existing structure S, while the track 32 is provided so as to warp from the excavation track 31 so as to be separated from the existing structure S. The predetermined orbit around which the excavation chain 11 orbits is curved between the excavation orbit 31 and the orbit 32 when viewed from the X direction as shown in FIG. The chain drive unit 13 is provided at an angle with respect to the excavation track 31.

The chain drive unit 13 does not have to be an electric motor. The chain drive unit 13 may be a gear box to which an electric motor is connected. For example, the gearbox may include bevel gears and the motor may be provided at a distance from the track 32. In this case, the axial direction of the rotating shaft that transmits the driving force to the excavation chain 11 of the gearbox intersects the axial direction of the rotating shaft of the electric motor.

Another modification will be described. The excavation chain 11 does not have to orbit in a predetermined orbit. For example, the excavation chain 11 may excavate the ground G by reciprocating on the excavation track 31. The member main body may be a drain material in the paper drain method. The drain material is in the shape of a long plate. The drain material has a plurality of flow paths arranged in the plate width direction inside. Multiple channels suck up the water in the ground after laying. In this case, the drain material and the guide frame 22 holding the drain material form the target member. The drain method according to this modification includes a step of embedding the drain material in the ground and laying the drain material, and then a step of draining water from the ground through the drain material.

[Action effect]
According to the laying device 1 and the laying method of the present invention, the freezing member 2 is inserted into the ground G while excavating the ground G around the freezing member 2 by the excavation chain 11 traveling on the excavation track 31. The first step is carried out. It is not necessary to widen the excavation area to provide a margin as in the case of inserting the freezing member 2 after excavating the ground G. That is, the excavation range of the ground G by the laying device 1 and the laying method of the present invention is suppressed to a degree slightly larger than that of the freezing member 2 to be laid. Therefore, according to the laying device 1 and the laying method, the freezing member 2 can be laid in the ground G in a narrow place. In addition, the amount of excavated soil generated by the laying of the freezing member 2 can be reduced.

In the first step, the freezing member 2 is inserted into the ground G by pushing the guide frame 22 toward the ground G while the excavation chain 11 is running, and the guide frame 22 is extended to the guide frame 22. The process of adding the extension frame 24 to be performed is performed. According to this laying method, the freezing member 2 can be inserted into the ground G by the process of pushing the guide frame 22.

In the second step, the excavation chain 11 is pulled out of the ground G from the ground G along the excavation track 31 and recovered. According to this laying method, the excavation chain 11 can be recovered from the ground G after the freezing member 2 is left behind.

The freezing member 2 is a long plate-shaped member whose insertion direction into the ground G is the longitudinal direction (Z direction). The excavation track 31 of the excavation chain 11 includes a pair of side surface portions 31a extending in the longitudinal direction (Z direction) along the edges of both ends of the freezing member 2 in the plate width direction (X direction), and the freezing member 2. It has a tip portion 31b extending along the edge of the tip in the insertion direction (Z direction) and connecting the side surface portions 31a to each other. According to this laying method, a long plate-shaped freezing member 2 can be laid in the ground G. Further, it is possible to carry out a construction method in which a plurality of flow paths F are arranged in the plate width direction (X direction) to form a long plate-shaped member (freezing pipe 21 and drain material) in the ground G.

According to the laying device 1A and the laying method according to the modification of FIG. 9, the track 32 of the excavation chain 11 around the chain drive unit 13 is separated from the existing structure S as compared with the excavation track 31. According to this modification, it is possible to prevent the chain drive unit 13 from interfering with the existing structure S.

1 ... laying device, 2 ... freezing member (target member), 11 ... excavation chain, 12 ... insertion drive unit, 13 ... chain drive unit, 21 ... freezing pipe (member body), 22 ... guide frame, 22a ... guide unit , 24 ... extension frame, 31 ... excavation track, 31a ... side surface part, 31b ... tip part, 32 ... track, G ... ground, S ... existing structure.

Claims (6)

It is a method of laying a predetermined target member by embedding it in the ground.
The first step of inserting the target member into the ground while excavating the ground by running an excavation chain on a predetermined excavation track along the circumference of the target member.
A laying method comprising a second step of leaving the target member in the ground after the target member reaches a predetermined depth. The target member includes a member body and a guide frame that surrounds the member body, holds the member body inside, and includes a guide portion on the outside that guides the excavation chain to travel on the excavation track. Have and
In the first step,
A process of inserting the target member into the ground by pushing the guide frame toward the ground while the excavation chain is running.
The laying method according to claim 1, wherein a process of adding an extension frame extending the guide frame to the guide frame is executed. The laying method according to claim 1 or 2, wherein in the second step, the excavation chain is pulled out of the ground from the ground along the excavation track and collected. The target member is a long plate-shaped member whose longitudinal direction is the insertion direction into the ground.
The excavation track of the excavation chain is
A pair of side surface portions extending in the longitudinal direction along the edges of both ends of the target member in the plate width direction,
The laying method according to any one of claims 1 to 3, further comprising a tip portion extending along the edge portion of the tip of the target member in the insertion direction and connecting the side surface portions to each other. It is a laying method of laying the target member in the ground along the existing structure provided in the ground.
The excavation chain travels by using a chain drive unit installed outside the ground as a drive source.
The laying method according to any one of claims 1 to 4, wherein the track of the excavation chain around the chain drive unit is separated from the existing structure as compared with the excavation track. It is a device that embeds a predetermined target member in the ground and lays it.
An excavation chain that travels on a predetermined excavation track along the circumference of the target member to excavate the ground.
A laying device including an insertion drive unit for inserting the target member and the excavation chain into the ground together.

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