JP7195223B2 - LINEAR OBJECT INSTALLATION METHOD AND LINEAR OBJECT INSTALLATION UNIT - Google Patents

Description

The present invention relates to a method for installing a linear body in ground and a unit for installing a linear body in ground.

2. Description of the Related Art When constructing a civil engineering structure, a linear body may be installed in the ground and the state of the ground may be detected using the linear body. Patent Literature 1 discloses a method of laying an optical fiber cable in the ground for measuring ground displacement.

In the method disclosed in Patent Document 1, an optical fiber cable is attached to the outer peripheral surface of a pipe, and this pipe is inserted into a boring hole formed in the ground. Next, grout is injected by a grout hose between the outer peripheral surface of the pipe and the inner wall surface of the boring hole. Ground displacement is transmitted through the grout to the fiber optic cable and captured by the fiber optic cable.

JP-A-2002-156215

When installing a linear body such as an optical fiber cable on the ground by the method disclosed in Patent Document 1, the grout is applied from the tip side of the borehole toward the mouth of the borehole between the outer peripheral surface of the pipe and the inner wall surface of the borehole. It is preferable to inject and fill the gap. By injecting and filling the grout in this way, the air in the gap is pushed out from the mouth of the boring hole by the grout, so the gap can be easily filled with the grout. In addition, since the grout flows out from the mouth of the boring hole after filling the gap, it is possible to easily determine whether the gap has been filled with the grout.

In order to inject and fill the grout from the tip side of the borehole toward the mouth, after inserting the pipe into the borehole, insert the grout hose into the tip of the borehole through the gap between the outer peripheral surface of the pipe and the inner wall surface of the borehole. It is possible to insert up to However, the size of the gap is limited, and it is difficult to insert the grout hose through the gap to the tip of the borehole. Therefore, it takes time to insert the grout hose, and the linear body cannot be efficiently installed in the ground.

An object of the present invention is to efficiently install a linear body in the ground.

The present invention relates to a linear body installation method for installing a linear body in ground using a linear body installation unit. and a collapsible tubular body forming a passage along the axial direction of the rod-shaped member . an inserting step of inserting the unit for installation into a boring hole formed in the ground; and feeding grout into the passage of the unit for installing the linear object inserted into the boring hole so that the outer peripheral surface of the unit for installing the linear object is fed from the passage. and a filling step of filling grout between the inner wall surface of the borehole and the filling step expanding the folded tubular body by the pressure of the grout delivered to the passage to expand the flow passage cross section of the passage. do .

The present invention is a linear body installation unit for inserting a linear body into the ground, filling the ground with grout, and installing the linear body in the ground, wherein the linear body is attached to the outer peripheral surface. a rod-shaped member, a tubular body in which the linear body and the rod-shaped member are arranged inside, and a grout formed between the outer peripheral surface of the rod-shaped member and the inner peripheral surface of the tubular body along the axial direction of the rod-shaped member a leading passageway , wherein the tube is axially collapsible and expanded by the pressure of grout delivered into the passageway to enlarge the flow cross-section of the passageway .

ADVANTAGE OF THE INVENTION According to this invention, a linear body can be efficiently installed in the ground.

It is a figure for demonstrating the linear body installation method which concerns on 1st Embodiment of this invention. (a) is a cross-sectional view of the linear body installation unit used in the linear body installation method according to the first embodiment, showing a state in which the flexible hose is folded; ) is a sectional view along line IIB-IIB shown in FIG. 3A is a cross-sectional view of the linear body installation unit used in the linear body installation method according to the first embodiment, showing a state in which the flexible hose is spread; FIG. 1 is a cross-sectional view along line IIIB-IIIB shown in FIG. 1(a) is a cross-sectional view taken along line IVA-IVA shown in FIG. 1(b), and FIG. 1(b) is a cross-sectional view taken along line IVB-IVB shown in FIG. 1(d). (a) is a cross-sectional view of a linear body installation unit according to a modification of the first embodiment of the present invention, and (b) is a cross-sectional view taken along line VB-VB shown in FIG. 5(a). (a) is a cross-sectional view of a linear body installation unit used in a linear body installation method according to a second embodiment of the present invention; (b) is a linear body installation unit according to a second embodiment of the present invention; It is a figure for demonstrating the filling process of the body installation method. (a) is a cross-sectional view of a linear body installation unit used in a linear body installation method according to a third embodiment of the present invention; (b) is a linear body installation unit according to the third embodiment of the present invention; It is a figure for demonstrating the filling process of the body installation method.

Hereinafter, a linear body installation method and a linear body installation unit according to an embodiment of the present invention will be described with reference to the drawings.

<First embodiment>
First, a linear body installation method and a linear body installation unit 100 according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. Here, a case where the linear body is an optical fiber cable will be described.

In the construction of civil engineering structures, it is important to grasp the state of the ground such as landslides, and optical fiber cables are sometimes installed in the ground for measuring underground strain. An optical fiber cable installed in the ground is distorted under ground strain. Therefore, underground strain can be measured by measuring the strain of the optical fiber cable.

An optical fiber cable has the property of slightly backscattering an incident pulsed light, and by utilizing this property, it is possible to measure the strain at multiple positions in the optical fiber cable. Specifically, since the frequency of the scattered light depends on the strain of the optical fiber cable, the strain of the optical fiber cable can be measured by injecting pulsed light into the optical fiber cable and measuring the frequency of the scattered light. . In addition, by measuring the time from when the pulsed light is incident on the optical fiber cable until the scattered light generated in the optical fiber cable returns to the incident position, the position where the scattered light is generated, that is, the distortion in the optical fiber cable can be measured. The resulting position and magnitude of strain can be measured.

By installing an optical fiber cable in the ground and measuring the strain at a plurality of positions on the optical fiber cable, the underground strain can be measured at a plurality of positions. Therefore, it is possible to accurately grasp the state of the ground.

As a method of installing an optical fiber cable in the ground, it is conceivable to insert the optical fiber cable alone into the ground. In this method, the optical fiber cable may be unintentionally bent in the ground or installed under unintended stress. In this case, the position and magnitude of the ground distortion cannot be measured accurately, and the state of the ground cannot be accurately grasped.

For this reason, an optical fiber cable is attached to the outer peripheral surface of a rod-shaped member, and this rod-shaped member is inserted into a boring hole formed in the ground, and grout is filled between the outer peripheral surface of the rod-shaped member and the inner wall surface of the boring hole. Therefore, it is preferable to install the optical fiber cable in the ground. In this case, the rod-shaped member can prevent the optical fiber cable from being unintentionally bent or subjected to unintended stress, so that the position and magnitude of underground strain can be accurately measured. , the condition of the ground can be accurately grasped.

When filling the grout, it is preferable to fill the gap between the outer peripheral surface of the rod-shaped member and the inner wall surface of the boring hole with the grout from the inside of the boring hole toward the mouth. By injecting the grout in this way, the air in the gap is pushed out from the mouth of the boring hole by the grout, so the gap can be easily filled with the grout. In addition, since the grout flows out from the mouth of the boring hole after filling the gap, it is possible to easily determine whether the gap has been filled with the grout.

In order to inject and fill the grout from the tip side of the borehole toward the mouth, after inserting the rod-shaped member into the borehole, the grout hose is passed through the gap between the outer peripheral surface of the rod-shaped member and the inner wall surface of the borehole. It is conceivable to insert up to the tip. However, the size of the gap is limited, and it is difficult to insert the grout hose through the gap to the tip of the boring hole. Therefore, it takes time to insert the grout hose, and the linear body cannot be efficiently installed in the ground.

In the linear body installation method according to the present embodiment, as shown in FIGS. 1 and 2, a rod-shaped member 10 having an optical fiber cable 1 attached to its outer peripheral surface and a passage formed along the axial direction of the rod-shaped member 10 30 into a boring hole 40 formed in the ground; and sending grout into the passageway 30 so that the outer peripheral surface of the linear body installation unit 100 is removed from the passageway 30. and a filling step of filling grout between the inner wall surface of the boring hole 40 and the inner wall surface of the boring hole 40 . The passage 30 is provided in the boring hole 40 along with the rod-shaped member 10 along the axial direction of the rod-shaped member 10 . Therefore, it is possible to easily form the passage 30 for injecting grout from the inside of the boring hole 40 to the mouth, and the optical fiber cable 1 can be efficiently installed in the ground.

Hereinafter, the linear body installation method and the linear body installation unit 100 according to the present embodiment will be specifically described.

As shown in FIGS. 2 and 3, linear body installation unit 100 has rod-shaped member 10 with optical fiber cable 1 attached to its outer peripheral surface, and optical fiber cable 1 and rod-shaped member 10 arranged inside. A flexible hose (tubular body) 20 is provided. The passage 30 is formed between the outer peripheral surface of the rod-shaped member 10 and the inner peripheral surface of the flexible hose 20 . Grout is delivered to passageway 30 .

The rod-shaped member 10 is made of rigid polyvinyl chloride, polyethylene, or metal, for example. The flexible hose 20 is made of, for example, soft polyvinyl chloride, has lower rigidity than the rod-like member 10, can be folded, and has flexibility. FIG. 2 shows a state in which a portion of the flexible hose 20 is folded, and FIG. 3 shows a state in which the flexible hose 20 is unfolded.

As shown in FIG. 2 , the flexible hose 20 can be folded so that the fold lines are along the axial direction of the bar member 10 . By widening the flexible hose 20 as shown in FIG. 3, the passage cross-section of the passage 30 can be enlarged and is enlarged. Also, the passage 30 may be expandable using the flexibility of the flexible hose 20 . In addition, a flow-path cross section is a cross section orthogonal to the flow direction of a grout.

The tip of the flexible hose 20 is open. Therefore, the grout delivered to the passage 30 can be led out from the tip of the flexible hose 20 .

Next, a method for installing the optical fiber cable 1 in the ground using the linear body installation unit 100 will be described with reference to FIGS. 1 and 4. FIG.

First, as shown in FIG. 1(a), the ground is excavated and a boring hole 40 is drilled. A drilling rod including a support tube 50 and a drilling bit (not shown) rotatably attached to the tip of the support tube 50 can be used for drilling the boring hole 40 . The support pipe 50 has a strength capable of supporting the inner wall surface of the boring hole 40, and can prevent the boring hole 40 from collapsing and being blocked.

The drill bit is attachable to and detachable from the support tube 50 . After drilling the borehole 40 , the drill bit is removed from the support tube 50 and extracted from the borehole 40 . FIG. 1(a) shows a state in which the drill bit is extracted from the boring hole 40. FIG. note that. The drill bit may be left in the boring hole 40 without being extracted from the boring hole 40 .

Next, as shown in FIG. 1B, the linear body installation unit 100 is inserted into the support tube 50 to a predetermined position on the distal end side of the boring hole 40 (insertion step). By inserting linear body installation unit 100 , rod-shaped member 10 and flexible hose 20 are installed in boring hole 40 . In other words, the passage 30 is provided along the axial direction of the rod-shaped member 10 to the tip of the boring hole 40 together with the rod-shaped member 10 .

In the insertion step, as shown in FIGS. 2A, 2B, and 4A, a portion of the flexible hose 20 is folded to reduce the maximum outer dimension of the linear body installation unit 100 to that of the support tube 50. Make it smaller than the inner diameter. Therefore, linear body installation unit 100 can be easily inserted into support tube 50 .

Next, as shown in FIG. 1(c), the support tube 50 is extracted from the boring hole 40. Then, as shown in FIG. As a result, the flexible hose 20 faces the inner wall surface of the boring hole 40 and a space for expanding the flexible hose 20 is formed in the boring hole 40 .

Next, as shown in FIG. 1(d), grout is delivered to the passage 30, and the gap between the outer peripheral surface of the flexible hose 20 and the inner wall surface of the boring hole 40 is filled with the grout from the opening at the tip of the flexible hose 20. (filling process). Since the passage 30 is provided in the boring hole 40 in the insertion process, the grout is guided deep into the boring hole 40 through the passage 30 and flows from the opening at the tip of the flexible hose 20 to the outer peripheral surface of the flexible hose 20 and the boring hole 40. It flows into the gap with the inner wall surface. Therefore, the gap can be filled with grout while the air in the gap is pushed out from the mouth of the boring hole 40 by the grout.

The flexible hose 20 expands under the pressure of the grout delivered to the passage 30, and the flow passage cross section of the passage 30 can be expanded. Therefore, blockage of the passage 30 by grout can be reduced, and grout can be easily delivered to the passage 30 .

In addition, since the support pipe 50 is extracted from the boring hole 40 and a space for expanding the flexible hose 20 is formed in the boring hole 40, the flexible hose 20 can be extended to the maximum as shown in FIG. 4(b). can be extended. Therefore, the channel cross-section of the passage 30 can be maximized, and the grout can be more easily delivered to the passage 30 .

Furthermore, since the tip of the flexible hose 20 is open, the grout delivered to the passage 30 is guided to the tip of the flexible hose 20 and spreads around the outer circumference of the flexible hose 20, as indicated by the thick arrow in FIG. 1(d). It flows between the face and the borehole 40 . Therefore, the grout can be easily filled between the outer peripheral surface of the flexible hose 20 and the inner wall surface of the boring hole 40 over the entire flexible hose 20 inserted into the boring hole 40 .

When the grout flows out from the mouth of the boring hole 40, it is determined that the gap between the outer peripheral surface of the flexible hose 20 and the inner wall surface of the boring hole 40 is filled with grout, and the delivery of grout is stopped.

Installation of the optical fiber cable 1 is thus completed. Underground strain is transmitted from the inner wall surface of the boring hole 40 to the optical fiber cable 1 through the grout, the flexible hose 20 and the grout. Therefore, by measuring the strain of the optical fiber cable 1, the strain generated in the ground can be measured.

According to the first embodiment described above, the following effects are obtained.

According to the linear body installation method according to the present embodiment, the linear body installation unit 100 including the rod-shaped member 10 and the passage 30 is inserted into the boring hole 40 , the grout is fed into the passage 30 , and the grout is discharged from the passage 30 . Grout is filled between the outer peripheral surface of the linear body installation unit 100 and the inner wall surface of the boring hole 40 . The passage 30 is provided in the boring hole 40 together with the rod-shaped member 10 along the axial direction of the rod-shaped member 10 , and the grout is guided into the boring hole 40 through the passage 30 to and the inner wall surface of the boring hole 40 . Therefore, it is possible to easily form the passage 30 for injecting grout from the inside of the boring hole 40 to the mouth, and the optical fiber cable 1 can be efficiently installed in the ground.

Also, a flexible hose 20 is used as a tubular body in which the optical fiber cable 1 and the rod-like member 10 are arranged. Therefore, the linear body installation unit 100 can be divided into a state in which a portion of the flexible hose 20 is folded to reduce the cross section of the passage 30 and a state in which the flexible hose 20 is widened to increase the cross section of the passage 30. , can be transformed into That is, the maximum outer dimension of the linear body installation unit 100 can be changed. Therefore, the linear body installation unit 100 can be easily inserted into the boring hole 40 in the insertion process, and the grout can be easily delivered to the passage 30 in the filling process, so that the optical fiber cable 1 can be efficiently installed in the ground. be able to.

The tip of the flexible hose 20 is open, and the grout is filled between the outer peripheral surface of the flexible hose 20 and the inner wall surface of the boring hole 40 from the tip of the flexible hose 20 . Therefore, the grout is guided to the tip of the flexible hose 20 through the passage 30 and flows between the outer peripheral surface of the flexible hose 20 and the boring hole 40 . Therefore, the grout can be easily filled between the outer peripheral surface of the flexible hose 20 and the inner wall surface of the boring hole 40 over the entirety of the flexible hose 20 inserted into the boring hole 40, and the optical fiber cable 1 can be placed on the ground. It can be installed efficiently inside

In the insertion step, the linear body installation unit 100 is inserted into the support tube 50 capable of supporting the inner wall surface of the boring hole 40 . Therefore, the space for inserting linear body installation unit 100 can be maintained by support tube 50 . Therefore, even in the ground where the inner wall surface of the boring hole 40 is likely to collapse, the optical fiber cable 1 can be efficiently installed in the ground.

In addition, in the filling process, the support pipe 50 is extracted from the boring hole 40 and a space for expanding the flexible hose 20 is formed in the boring hole 40, so that the flexible hose 20 can be expanded to the maximum extent. Therefore, the channel cross-section of the passage 30 can be maximized, the grout can be delivered to the passage 30 more easily, and the optical fiber cable 1 can be efficiently installed in the ground.

In this embodiment, the optical fiber cable 1 and the rod-shaped member 10 are arranged inside the flexible hose 20, and the passage 30 is formed between the outer peripheral surface of the rod-shaped member 10 and the inner peripheral surface of the flexible hose 20. However, like the linear body installation unit 101 according to the modification of this embodiment shown in FIG. You may Passage 30 is also provided along the axial direction of rod-shaped member 10 in boring hole 40 together with rod-shaped member 10 by using linear body installation unit 101 . Therefore, it is possible to easily form the passage 30 for injecting grout from the inside of the boring hole 40 to the mouth, and the optical fiber cable 1 can be efficiently installed in the ground. Moreover, since the flexible hose 21 is foldable or has flexibility, it can be easily inserted into the boring hole 40 or the support tube 50 and deformed.

As shown in FIGS. 2 and 3, linear body installation unit 100 in which optical fiber cable 1 and rod member 10 are arranged inside flexible hose 20 is compared with linear body installation unit 101 shown in FIG. Therefore, the cross section of the passage 30 can be increased. Therefore, the grout can be easily delivered to the passage 30, and the optical fiber cable 1 can be installed in the ground more efficiently.

The rod-shaped member 10 is not limited to a solid member, and may be a hollow member (for example, a pipe). In this case, another measuring instrument such as a horizontal inclinometer can be installed inside the rod-shaped member 10, and the state of the ground can be detected more accurately.

Instead of delivering the grout to the passageway 30 after the support tube 50 is extracted from the borehole 40, the grout may be delivered to the passageway 30 while the support tube 50 is being extracted. In this case, before the grout flows out from the mouth of the boring hole 40 through the gap between the outer peripheral surface of the flexible hose 20 and the inner wall surface of the boring hole 40, the gap is prevented from being closed by the collapsing of the boring hole 40. can be done.

If the ground is stable and there is no risk of the boring hole 40 collapsing, instead of inserting the linear body installation unit 100 into the supporting pipe 50, the supporting pipe 50 is extracted from the boring hole 40 and then the wire is removed. The shaped body installation unit 100 may be inserted into the borehole 40 .

<Second embodiment>
Next, a linear body installation method and a linear body installation unit 200 according to a second embodiment of the present invention will be described with reference to FIG. In the following, differences from the first embodiment will be mainly described, and the same or corresponding configurations as those described in the first embodiment will be denoted by the same reference numerals as those in the first embodiment. Description is omitted. In addition, since the steps other than the filling step in this embodiment are substantially the same as those in the first embodiment, description thereof will be omitted.

FIG. 6A is a cross-sectional view of the linear body installation unit 200 used in the linear body installation method according to the present embodiment. FIG. 6B is a diagram for explaining the filling step of the linear body installation method according to the present embodiment.

As shown in FIG. 6( a ), in the linear body installation unit 200 , the rod-shaped member 210 is a so-called hollow pipe, and the passage 30 is formed inside the rod-shaped member 210 . Therefore, compared with the linear body installation unit 100 having the flexible hose 20 (see FIGS. 2 and 3, etc.), the number of parts can be reduced, and the linear body installation unit 200 can be easily manufactured. can.

In linear body installation unit 200 , rod member 210 is not covered with a member such as flexible hose 20 in linear body installation unit 100 . Therefore, compared with the linear body installation unit 100, the maximum outer dimension of the linear body installation unit 200 can be reduced. Therefore, linear body installation unit 200 can be easily inserted into support tube 50 in the insertion step.

The tip of the rod-shaped member 210 is open so that the grout delivered to the passage 30 can be led out from the tip of the rod-shaped member 210 .

As shown in FIG. 6( b ), in the filling step, grout is delivered to the passage 30 and filled between the outer peripheral surface of the bar member 210 and the inner wall surface of the boring hole 40 from the passage 30 . Also in this embodiment, as in the first embodiment, the passage 30 is provided in the boring hole 40 by inserting the rod-shaped member 210, and the grout is guided into the boring hole 40 through the passage 30 and the rod-shaped member 210 and the inner wall surface of the boring hole 40 . Therefore, it is possible to easily form the passage 30 for injecting and filling grout from the inside of the boring hole 40 to the mouth thereof, and the optical fiber cable 1 can be efficiently installed in the ground.

Since the tip of the rod-shaped member 210 is open, the grout is guided to the tip of the rod-shaped member 210 and flows between the outer peripheral surface of the rod-shaped member 210 and the boring hole 40 . Therefore, the grout can be easily filled between the outer peripheral surface of the rod-shaped member 210 and the inner wall surface of the boring hole 40 over the entirety of the rod-shaped member 210 inserted into the boring hole 40, and the optical fiber cable 1 can be placed on the ground. It can be installed efficiently inside

Also in this embodiment, grout may be delivered to the passage 30 while extracting the support tube 50 instead of delivering the grout to the passage 30 after the support tube 50 is extracted from the boring hole 40 . If the ground is stable and boring hole 40 is not likely to collapse, linear body installation unit 200 may be inserted into boring hole 40 after support tube 50 is extracted from boring hole 40 .

When grout is delivered to the passage 30 after the support pipe 50 is extracted from the boring hole 40, the grout flows between the outer peripheral surface of the rod-shaped member 210 and the inner wall surface of the boring hole 40 without the support pipe 50. do. Therefore, grout can be easily filled between the outer peripheral surface of the rod-shaped member 210 and the inner wall surface of the boring hole 40, and the optical fiber cable 1 can be efficiently installed in the ground.

<Third Embodiment>
Next, a linear body installation method and a linear body installation unit 300 according to a third embodiment of the present invention will be described with reference to FIG. In the following, points different from the second embodiment will be mainly described, and the same or corresponding configurations as those described in the second embodiment will be denoted by the same reference numerals as those in the second embodiment. Description is omitted. In addition, since the processes other than the filling process of this embodiment are substantially the same as those of the second embodiment, description thereof will be omitted.

FIG. 7(a) is a cross-sectional view of the linear body installation unit 300 used in the linear body installation method according to the present embodiment. FIG. 7B is a diagram for explaining the filling step of the linear body installation method according to the present embodiment.

As shown in FIG. 7( a ), in linear body installation unit 300 , hose 320 is inserted into rod-like member 210 , and passage 30 is formed by hose 320 . The tip of the rod-shaped member 210 and the tip of the hose 320 are open, and the grout delivered to the passage 30 can be led out from the tip of the hose 320 .

A packer 360 is provided on the outer periphery near the tip of the hose 320 to block the space between the outer peripheral surface of the hose 320 and the inner peripheral surface of the rod-shaped member 210 . Therefore, it is possible to prevent grout from flowing into between the outer peripheral surface of the hose 320 and the inner peripheral surface of the bar-shaped member 210 from the tip of the bar-shaped member 210 .

As shown in FIG. 7( b ), in the filling step, grout is delivered to the passage 30 and filled between the outer peripheral surface of the bar member 210 and the inner wall surface of the boring hole 40 from the passage 30 . Also in this embodiment, as in the second embodiment, the passage 30 is provided in the boring hole 40 by inserting the rod-shaped member 210, and the grout is guided into the boring hole 40 through the passage 30 and the rod-shaped member 210 and the inner wall surface of the boring hole 40 . Therefore, it is possible to easily form the passage 30 for injecting grout from the inside of the boring hole 40 to the mouth, and the optical fiber cable 1 can be efficiently installed in the ground.

Since the tip of the rod-shaped member 210 and the tip of the hose 320 are open, the grout is guided to the tip of the rod-shaped member 210 and flows between the outer peripheral surface of the rod-shaped member 210 and the boring hole 40 . Therefore, the grout can be easily filled between the outer peripheral surface of the rod-shaped member 210 and the inner wall surface of the boring hole 40 over the entirety of the rod-shaped member 210 inserted into the boring hole 40, and the optical fiber cable 1 can be placed on the ground. It can be installed efficiently inside

Since the packer 360 is provided on the outer periphery near the tip of the hose 320, the grout coming out from the tip of the hose 320 is prevented from flowing between the outer peripheral surface of the hose 320 and the inner peripheral surface of the rod-shaped member 210. be able to. Therefore, the gap between the outer peripheral surface of hose 320 and the inner peripheral surface of rod-shaped member 210 can be used as a storage space. By installing another measuring instrument such as a horizontal inclinometer in the accommodation space, the state of the ground can be detected more accurately.

Also in this embodiment, grout may be delivered to the passage 30 while extracting the support tube 50 instead of delivering the grout to the passage 30 after the support tube 50 is extracted from the boring hole 40 . If the ground is stable and boring hole 40 is not likely to collapse, linear body installation unit 300 may be inserted into boring hole 40 after support tube 50 is extracted from boring hole 40 .

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments. No.

In the linear body installation units 100 and 101 (see FIGS. 1 and 5), openings are formed in the side surfaces of the flexible hoses 20 and 21, and the distance between the outer peripheral surface of the flexible hose 20 and the boring hole 40 from the openings is formed. may be filled with grout. Similarly, in the linear body installation unit 200 (see FIG. 6), an opening is formed in the side surface of the rod-shaped member 210, and grout is filled between the outer peripheral surface of the rod-shaped member 210 and the boring hole 40 through the opening. You may In the linear body installation unit 300 (see FIG. 7), openings are formed in the side surface of the rod-shaped member 210 and the side surface of the hose 320, and the grout is applied between the outer peripheral surface of the rod-shaped member 210 and the boring hole 40 from the openings. may be filled.

In the linear body installation unit 100, the flexible hose 20 is used as the tubular body in which the optical fiber cable 1 and the rod-shaped member 10 are arranged. A flexible tubular body may also be used.

In each of the above embodiments, one optical fiber cable 1 is attached to the outer peripheral surface of the rod-shaped member 10, 210. A plurality of optical fiber cables 1 may be attached to the outer peripheral surface. Also, the optical fiber cable 1 may be spirally attached to the outer peripheral surface of the rod-shaped member 10 or 210 .

The linear body is not limited to the optical fiber cable 1, and may be an electric wire or the like. For example, it may be a sensor that measures temperature, such as a thermocouple.

100, 101, 200, 300 Linear body installation unit 1 Optical fiber cable (linear body)
10, 210 Rod-shaped member 20 Flexible hose (tubular body)
30... Passage 40... Boring hole 50... Support pipe

Claims (3)

A linear body installation method for installing a linear body in ground using a linear body installation unit , comprising:
The linear body installation unit includes a rod-shaped member having the linear body attached to its outer peripheral surface, and a collapsible tubular body forming a passage along the axial direction of the rod-shaped member ,
The linear body installation method includes:
an inserting step of inserting the linear body installation unit into a boring hole formed in the ground with the tubular body folded along the axial direction ;
A grout is delivered to the passage of the linear body installation unit inserted into the boring hole, and the grout is spread from the passage between the outer peripheral surface of the linear body installation unit and the inner wall surface of the boring hole. a filling step of filling the
In the filling step, the folded tubular body is expanded by the pressure of the grout delivered to the passage to expand the cross section of the passage.
Linear body installation method. The linear body and the rod-shaped member are arranged inside the tubular body, and the passage is formed by the outer peripheral surface of the rod-shaped member and the inner peripheral surface of the tubular body,
In the filling step, the grout is delivered to the passage from the mouth of the boring hole toward the back, and the gap between the outer peripheral surface of the tubular body and the inner wall surface of the boring hole is filled from the passage with the grout.
The linear body installation method according to claim 1 . A linear body installation unit for inserting a linear body into the ground, filling the ground with grout, and installing the linear body in the ground,
a rod-shaped member having the linear body attached to its outer peripheral surface;
a tubular body in which the linear body and the rod-shaped member are arranged;
a passage that is formed between the outer peripheral surface of the rod-shaped member and the inner peripheral surface of the tubular body and guides the grout along the axial direction of the rod-shaped member ;
The tubular body is foldable along the axial direction, and is expanded by the pressure of the grout delivered to the passage to expand the cross section of the passage.
Unit for linear body installation.

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