JP2001262975A - Tunnel removing method and tunnel back-filling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the removal of a small diameter tunnel. SOLUTION: A wire saw 91 is arranged on the outside and inside of a jacking pipe line 62 to be removed extending over both ends of the jacking pipe line 62. The jacking pipe line 62 is edge-cut from a ground 80 side by the wire saw 91, and one end of the jacking pipe line 62 is jacked toward the other end, whereby the jacking pipe line 62 is jacked and removed from the ground 80.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel removal method and a tunnel backfill method capable of suitably removing unnecessary tunnels.

[0002]

2. Description of the Related Art Construction is underway to remove and refill old tunnels that are no longer used, such as sewer pipes. Conventionally, in such tunnel backfilling work, the surrounding ground of the existing tunnel is excavated with a shield machine, the tunnel lining excavated from the ground is dismantled in the shield machine, and the tunnel lining is dismantled and removed A backfill material was cast in the area.

[0003]

When the existing tunnel is constructed by the propulsion method, the tunnel lining is formed by the propulsion pipe. Conventionally, many small-diameter propulsion pipes have been employed, and in this case, a small-diameter shield machine used in the tunnel backfilling work is used. However, in a small-diameter shield machine, the working space inside the machine is very narrow, and for example, dismantling the propulsion pipe in the machine is not an easy task.

[0004] In view of the above, it is an object of the present invention to provide a tunnel removing method and a tunnel backfilling method capable of easily removing and backfilling a small-diameter tunnel formed by a propulsion pipe or the like. .

[0005]

According to the first aspect of the present invention which achieves the above object, a propulsion pipe row (62) comprising a plurality of propulsion pipes (61) is laid in a ground (80) by a propulsion method. In a tunnel removing method for removing a tunnel (60) constructed in this manner, a linear saw means (91) is arranged outside both ends of the propulsion pipe row to be removed, and the saw is provided. The propulsion pipe row is cut off from the ground by means, and the propulsion pipe row is cut off from the ground by cutting one end of the propulsion pipe row toward the other end. .

According to a second aspect of the present invention, when the propulsion pipe row is cut off from the ground side by the saw means, a lubricating material is injected between the mutually cut propulsion pipe row and the ground side. It is characterized by doing.

According to a third aspect of the present invention, the saw means is a wire saw formed in a loop shape, and the wire saw is folded at both ends of the propulsion pipe row to the outside of the propulsion pipe row. It is characterized by being arranged inside.

According to a fourth aspect of the present invention, the propulsion pipe row is laid so as to connect between shafts (50).
The wire saw is characterized in that a driving device (92) for driving the wire saw is disposed in the shaft.

According to a fifth aspect of the present invention, the tunnel to be removed has the propulsion pipe row and an existing manhole (65) connected to an end of the propulsion pipe row. The vertical shaft is characterized by being formed using the existing manhole.

According to a sixth aspect of the present invention, when the propulsion tube rows are propelled and removed from the ground by the tunnel removing method, the backfill material is refilled in the underground space after the propulsion of the propulsion tube rows. It is characterized by setting up a tunnel and backfilling the tunnel.

It should be noted that the numbers in parentheses and the like are for convenience showing the corresponding elements in the drawings, and therefore, the present description is not limited to the description on the drawings.

[0012]

As described above, according to the first aspect of the present invention, since the propulsion pipe row is cut off from the ground side by the sawing means, the propulsion pipe row can be easily propelled in the ground. That is, since the propulsion tube row is easily propelled from the ground and removed, the removal operation is easy, and there is no need for an operator to enter the shield machine and disassemble the propulsion tube as in the related art. Therefore, even if the propulsion pipe has a small diameter, there is almost no need for an operator to enter the propulsion pipe, so that it does not hinder the construction. That is, according to the present invention, a small-diameter tunnel can be easily removed.

According to the second aspect of the present invention, since the lubricating material is injected between the propulsion pipe row and the ground side which are cut off from each other, the frictional resistance between the propulsion pipe row and the ground side is further reduced. Thus, the propulsion removal of the propulsion tube row can be performed more smoothly.

According to the third aspect of the present invention, a loop-shaped wire saw can be arranged by utilizing the inside of the propulsion tube row, which is advantageous.

According to the fourth aspect of the present invention, it is convenient to install the driving device using the working space in the shaft.

According to the fifth aspect of the present invention, since the shaft is formed by using the existing manhole, the existing manhole can be used. This saves construction work.

According to the sixth aspect of the present invention, each effect provided by the above-described tunnel removing method can be exhibited in tunnel backfilling.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a schematic side sectional view showing a tunnel backfilling step, FIG. 2 is a schematic side sectional view showing a friction cutting step, FIG. 3 is a detailed side view showing the inside of a working shaft, and FIG. 4 is propulsion in the friction cutting step. FIG. 5 is an enlarged view of the vicinity of the tunnel backfilling device, and FIG. 6 is a sectional view taken along line AA ′ of FIG.

As shown in FIG. 2, the tunnel 60 to be backfilled is provided with existing human holes 65, 65 formed in the ground 80,
And a propulsion pipe row 62 constructed by a propulsion method so as to connect the human holes 65, 65 (a part of the human hole 65 is indicated by a broken line because it is a removed portion). Propulsion pipe row 6
2 is constituted by connecting a plurality of propulsion pipes 61 each formed of a cylindrical fume pipe in a substantially horizontal series, and the propulsion pipe 61 has a small diameter (this embodiment assumes a diameter of about 800 mm). However, the present invention is not limited to this numerical value.)

As shown in FIG. 2, each of the manholes 65 has been rebuilt in the working shaft 50 before the tunnel 60 is backfilled. That is, around each of the human holes 65, a sheet pile 66 for retaining the ground is formed so as to surround the human hole 65 in a ring shape, and an area 67 from the ground to a predetermined depth in the area surrounded by the sheet pile 66. Has been cut. A part of the human hole 65 (broken line display part) has been removed along with the digging. By forming the working shaft 50 in this way, an opening required for the work is secured.

A backfill material (not shown) is provided between the outer periphery of the propulsion pipe 61 and the ground. A wire saw device 90 for cutting and removing the backfill material includes two working shafts 50 connected by a propulsion pipe row 62 as shown in FIG.
It is installed between 50. The wire saw device 90 used here is a wire saw device conventionally used in a wire sawing method (DWS method) or the like. That is, as shown in FIG. 2 and FIG.
A wire saw machine 92 (for example, a 25HP high-frequency wire saw machine or the like) that can be driven to run in a predetermined wire running direction (the direction of the arrow W) by winding and sending out a loop-shaped wire saw 91 on which diamond beads are attached at equal intervals.
And a plurality of pulleys 93 around which the wire saw 91 is wound
A to 93E (wire direction conversion pulley).

Specifically, the wire saw machine 92 is shown in FIG.
In an appropriate installation base 95 installed on the inner wall 51a in the work shaft 50 on the left side of the drawing, an up-down direction (arrow H in FIG. 3).
Direction). The pulleys 93A and 93B among the pulleys are fixedly installed on an installation base 95 as shown in FIG. 3A, and a wire saw 91 is attached to these pulleys 93A and 93B on the sending side of the wire saw machine 92. And the winding side. The end of the wire saw 91 from the pulley 93A (the arrow W side which is the wire running direction) is substantially horizontal.
It has reached the inside of the working shaft 50 on the right side of FIG. 2 through the inside of the propulsion tube row 62 connected to the working shaft 50. The pulley 93C is connected to the inner wall 5 in the working shaft 50 on the right side of FIG.
1a, and a wire saw 91 from a pulley 93A is wound therearound.

As shown in FIG. 3A, the pulley 93D is installed inside the working shaft 50 on the left side of FIG. 2 and at the end 61a of the propulsion pipe 61 connected to the working shaft 50. As shown in FIG. 3B, the pulley 93E is installed inside the working shaft 50 on the right side of FIG. 2 and at the end 61b of the propulsion pipe 61 connected to the working shaft 50. In addition, these pulleys 93D and 93E can be appropriately moved at the respective end portions 61a and 61b.

A wire saw 91 is provided on the pulley 93E.
The pulley 93C is wound around the positive side (the arrow W side) in the wire running direction. The wire saw 91 from the pulley 93E is disposed near the outer periphery of the underground propulsion pipe row 62, extends along the propulsion pipe row 62 to the left in FIG. Has been reached. The arrived wire saw 91 is connected to the pulley 9 as shown in FIG.
It is wound around 3D, and is further wound around the pulley 93B ahead of the pulley 93D.

On the other hand, the tunnel backfilling apparatus 1 used for backfilling the tunnel 60 has a shield machine 2 as shown in FIGS. 1, 5 and 6. The shield machine 2 has a shell 3 formed of a cylindrical steel pipe, and an end of the above-described propulsion pipe 61 is provided on the tip side (the right side of the paper in FIGS. 1 and 5) of the inside of the shell 3. It can be inserted freely. That is, the inner diameter of the shell 3 is slightly larger than the outer diameter of the propulsion pipe 61.

In the shell 3, as shown in FIG.
Is provided in the shell 3 so as to be slidable in the front-rear direction inside the shell 3. In addition, the shell 3 is provided with an appropriate support member 6 fixed to the shell 3,
A partition jack 7 such as a hydraulic jack is installed with the ram 7 a facing rearward. The cylinder side of the partition jack 7 is fixed to the support member 6, and the ram 7 a is fixed to the partition 5. In this embodiment, as shown in FIG. 6, two partition jacks 7 are provided, and these partition jacks 7, 7 are provided.
Are arranged symmetrically about the center axis CT of the shell 3 (the number and arrangement of the partition jacks 7 are not limited to this embodiment).

As shown in FIG. 5 and FIG. 6, an annular pressing ring 9 formed substantially concentrically with the shell 3 is provided in the shell 3. Is slidably movable in the front-rear direction inside. A direction correcting jack 10 such as a hydraulic jack is mounted on the shell 3 with the ram 10a facing forward via the support member 6, and the cylinder side of the direction correcting jack 10 is supported by the supporting member 6
The ram 10a is arranged so as to be able to press the pressing wheel 9 forward. In the present embodiment, as shown in FIG. 6, four direction correcting jacks 10 are provided in parallel, and these direction correcting jacks 10 are arranged at an equal angular pitch (90 degrees) about the center axis CT of the shell 3. (Note that the number and arrangement of the direction correcting jacks 10 are not limited to this embodiment.)

Further, as shown in FIGS. 5 and 6, two PC steel wires 11, 11 are fixed to the support member 6 near the rear ends of the steel wires. And these PCs
The other end of the steel wire 11 extends forward through the inside of the shell 3. In a state where the end of the propulsion pipe 61 is inserted into the inside of the shell 3, as shown in FIGS.
Extends forward through the inside of the propulsion pipe 61 and a plurality of propulsion pipes 61 connected to the front of the propulsion pipe 61. In the present embodiment, as shown in FIG. 6, two PC steel wires 11 are provided, and these PC steel wires 11 are symmetrically arranged about the central axis CT of the shell 3 (note that the PC steel wires 11 are provided). The number and arrangement of the eleven are not limited to the present embodiment.)

The partition 5 is provided with a backfill material placing means 20 capable of placing a backfill material behind the partition 5. The backfill material casting means 20 is a publicly known one, and includes a backfill material injection device and a liquid A injection pipe, a liquid B injection pipe, a washing pipe, and the like connected thereto. These injection pipes 20 a and the like extend forward through the inside of the shell 3 and the inside of the plurality of propulsion pipes 61, similarly to the PC steel wire 11 described above.

The tunnel backfilling device 1 has a traction device 30 as shown in FIG. 1, and the traction device 30 is disposed in a working shaft 50 in front of the plurality of propulsion pipes 61. . The towing device 30 has a gripper main body 31, and a PC steel wire 11 and an injection pipe 20 a which are disposed at the forefront of the row and protrude from an end of a propulsion pipe 61 located in a working shaft 50 (these are the above-mentioned shield machine). 2) penetrates the gripper body 31. An appropriate gripper means 32 is provided at a central portion of the gripper body 31.
The PC steel wire 11 penetrating the gripper body 31 is detachably gripped by the gripper means 32.

The towing device 30 has a plurality of towing jacks 33 such as hydraulic jacks. Working shaft 5
A suitable reaction force receiving member 35 is installed on the inner wall 51a of the “0” so as to surround the periphery of the portion through which the propulsion pipe 61 penetrates. The propulsion pipe 61 is arranged in an annular shape so as to surround the propulsion pipe 61. The rams 33a of the towing jacks 33 face forward, and the tips of the rams 33a are connected to the gripper body 31. That is, the gripper body 3 is pulled by the towing jack 33.
Numeral 1 is freely movable back and forth.

Reference numeral 40 in FIG. 1 denotes a backfill material plant installed on the ground for supplying a predetermined backfill material to the injection pipe 20a. Reference numeral 41
Is an operation panel for controlling the partition jack 7 and the direction correcting jack 10 of the shield machine 2 or the towing jack 33 of the towing device 30. And code 4
Reference numeral 2 denotes a rough terrain crane for lifting the propulsion pipe 61 dismantled in the working shaft 50 and carrying it out to the ground.

The existing tunnel 60 and wire saw device 9
0 and the tunnel backfilling device 1 are configured as described above, so that the tunnel 60 is backfilled using the wire saw device 90 and the tunnel backfilling device 1 in the following procedure.

First, as shown in FIG. 2, an existing human hole 65 is reconstructed into a working shaft 50. That is, a sheet pile 66 is cast around each human hole 65 in a manner surrounding the human hole 65 in a ring shape, and an area 67 from the ground to a predetermined depth in the area surrounded by the sheet pile 66 is cut out. This secures an opening and a work space necessary for the subsequent work. Next, a protective injection material 53 is injected around the propulsion pipe 61 connected to the working shaft 50 in the outer periphery of the lining body 51 of each working shaft 50 to improve the soil quality. This prevents the ground from collapsing when the propulsion pipe 61 moves.

Next, a friction cutting step for cutting and removing a backfill material (not shown) provided between the outer periphery of the propulsion pipe 61 and the ground is started. First, the lining body 51 of each working shaft 50 and the propulsion pipe 61 joined to the lining body 51
Are cut off by a suitable means such as a core drill (a water blocking material such as a rubber packing is appropriately installed as an entrance device in the opening formed at this time). And FIG.
As shown in (a), the lining body 51 of the working shaft 50 is moved to a position of a backfill material (not shown) around the propulsion pipe 61 joined to the working shaft 50 by a suitable means. Perform bowling. This boring is performed along the direction in which the propulsion pipe 61 extends, as indicated by the arrow B in FIG. Boring hole 55 drilled by the boring
(See FIG. 4) to reach the other working shaft 50.
As shown by a two-dot chain line in FIG. 4, it is preferable to form a plurality of boring holes 55 at appropriate intervals along the outer periphery of the propulsion pipe 61 (actually, about 1 to 3 holes are appropriate).

Next, the wire saw device 90 is installed as shown in FIGS. At the time of this installation, the wire saw 91 from the pulley 93E is led to the pulley 93D through the boring hole 55. For example, as shown in FIG. 4, a wire saw 91 is passed through a boring hole 55 drilled at the top of the propulsion pipe 61. For convenience of explanation, the position of the wire saw 91 in this state is set to a position P1 as indicated by a mark “x” in FIG.

When the installation of the wire saw device 90 is completed as described above, for example, the positions of the two pulleys 93D and 93E are installed at the position P2 in FIG. This position P2 is a position moved a predetermined distance from the current position P1 of the wire saw 91 in the direction of arrow S in FIG. 4 (a direction along the outer periphery of the propulsion pipe 61). In this embodiment, the pulleys 93D and 93E are always installed at the same positions to simplify the description.
It is assumed that D and 93E are kept substantially aligned and opposed in the axial direction of the propulsion pipe 61 (the left-right direction in FIG. 2).

Next, the wire saw machine 92 is operated to drive the wire saw 91 to travel in the direction of arrow W in the figure. As described above, since the two pulleys 93D and 93E are at the position P2, a force in the direction of arrow S in FIG. 4 acts on the wire saw 91 at the position P1 due to the tension of the wire saw 91.
As a result, the wire saw 91 is positioned at the boring hole 5 at the position P1.
5 and cut in the direction of arrow S. At this position, there is a backfill material (not shown) on the outer periphery of the propulsion pipe row 62,
The wire saw 91 moves from the position P1 to the position P2 in the direction of the arrow S while cutting the backfill material.

When cutting with the wire saw 91 as described above, as shown in FIG.
2 is appropriately moved in the vertical direction (the direction of arrow H) with respect to the installation base 95. Thereby, the wire saw 91 is adjusted so as to always have an appropriate tension. In addition, since the slip when the backfill material is cut by the wire saw 91 moves in the direction of the arrow W in FIG. 3A together with the wire saw 91 and is discharged into the working shaft 50, it is easily discharged. can do.

Further, in some of the propulsion tubes 61, a known sliding material introducing means 7 capable of injecting a sliding material or the like around the outer periphery of the propulsion tube 61.
0 (see FIGS. 1 and 4). That is, at the same time as the cutting by the wire saw 91 is advanced,
At 0, a lubricating material or the like is injected into the outer peripheral ground of the propulsion pipe row 62.
Thereby, the propulsion tube 6 formed by cutting with the wire saw 91
The surrounding space is filled with the lubricating material or the like. As a result, the friction between the ground and the propulsion pipe 61 is reduced.

The cut portion of the wire saw 91 during the movement from the position P1 to the position P2 is indicated by a reference numeral CL1 (hatched portion) in FIG. In addition, reference numeral CL2 (hatched portion) in FIG. 4 indicates a cutting trajectory by the wire saw 91 that is cut in the entire friction cutting step, including the movement of the wire saw 91 from the position P1 to the position P2.

Thereafter, the wire saw 91 between the pulleys 93D and 93E is passed through another boring hole 55, and
3D, 93E is installed at a position different from the boring hole 55, the wire saw machine 90 is operated, and the wire saw 91 is run to cut along the cutting track CL2 in FIG.
By cutting the entire cutting path CL2 in FIG. 4 with the wire saw 91, the edge cutting between the propulsion pipe row 62 and the ground 80 on the outer peripheral side thereof is completed, and the friction cutting step is completed. After the completion of this step, the entire wire saw device 90 is removed.

Subsequently, a tunnel backfilling step is performed. That is, the shield machine 2 is carried into one of the working shafts 50 (the left side in FIG. 1), and the shield machine 2 is attached to the end of the propulsion pipe 61 connected to the working shaft 50. That is, as shown in FIG. 5, the shield machine 2 is mounted such that the end of the propulsion pipe 61 is inserted into the shell 3 of the shield machine 2. Since the space between the propulsion pipe 61 and the ground 80 is cut off in the friction cutting step, the shield machine 2 can be easily mounted. Due to the mounting, the pressing wheel 9 was arranged in contact with the end of the propulsion pipe 61 in the axial direction (front-back direction). Further, the PC steel wire 11 and the injection pipe 20a from the shield machine 2 are allowed to reach the inside of another (right side in FIG. 1) working shaft 50 through the plurality of propulsion pipes 61.

Further, the towing device 30 is installed in the other working shaft 50. That is, as described above, a plurality of towing jacks 33 are installed on the reaction force receiving member 35 installed on the inner wall 51a of the working shaft 50, and the shield machine 2 is attached to the gripper body 31 connected to the towing jack 33.
Through the PC steel wire 11 and the injection pipe 20a. The penetrated PC steel wire 11 is gripped by the gripper means 32. The penetrating injection pipe 20a is connected to the backfill material plant 40 on the ground.

After the installation of the tunnel backfill apparatus 1 is completed as described above, backfill work is performed as follows. That is, first, on the traction device 30 side, the traction jack 33 is driven to project the ram 33a. As a result, the gripper body 31 is moved forward (to the right in FIG. 1) by a predetermined stroke so as to obtain a reaction force via the reaction force receiving member 35. Since the PC steel wire 11 is gripped and connected to the gripper body 31 via the gripper means 32, the PC steel wire 11 is pulled forward, and accordingly, the supporting member 6 is attached to the rear end side of the PC steel wire 11.
The shell body 3 connected via is pulled forward in the towing direction.

The propulsion pipe 61 at the rearmost end (the leftmost side in FIG. 1) in contact with the shell 3 and the support member 6, the direction correcting jack 10, and the pressing ring 9 in the towing direction (axial direction) is provided. As the shell 3 is pulled, the direction-correcting jack 10 and the pressing wheel 9
The pressing force is transmitted via the and is moved forward. That is, the entire propulsion pipe row 62 underground is propelled and moved forward by being pressed from the rear end side. By the propulsion movement, the foremost propulsion pipe 61 is introduced into the working shaft 50 on the side where the traction device 30 is installed. The friction between the propulsion pipe row 62 and the ground 80 is at least the friction resistance between the propulsion pipe row 62 and the ground 80 because the friction between the propulsion pipe row 62 and the ground 80 is cut off in the above-described friction cutting step, and a slipping material or the like is injected. The traction force is reduced so as to be less than the allowable load capacity of the pipe.

When the plurality of propulsion pipes 61 are pressed and moved by a predetermined distance as described above by driving the towing jack 33 by a predetermined stroke, the entire shell 3 of the shield machine 2 becomes a working shaft 50 (see FIG. 1). It is assumed that it has completely moved into the ground from the left side). In this state, it is assumed that the partition 5 of the shield machine 2 is located at the rearmost position (shown by a broken line in FIG. 5). In this state, the working shaft 50
A portion (hole) of the lining body 51 (left side in FIG. 1) to which the propulsion pipe 61 has been joined is closed with an appropriate temporary wall 52.

Next, in the shield machine 2, the partition jack 7 is driven to move the partition 5 forward with respect to the shell 3. At the same time, the partition wall 5 is
A backfill material 21 is cast and filled on the rear side (inside the shell 3). The partition wall 5 is provided with a pressure sensor 5a, and the pressure sensor 5a measures the pressure of the back-filled backfill material behind the partition wall 5 while maintaining the pressure at an appropriate value. It is preferable to cast the material 21.

When the partition jack 7 is pulled back by a predetermined stroke in this manner, and a predetermined amount of the backfilling material 21 has been driven, the operation proceeds by repeating the following procedures A, B, and C.

* Procedure A: The gripping means 30 releases the gripping of the PC steel wire 11 by the gripper means 32 and drives the towing jack 33 to return the gripper body 31 to the rear of the predetermined stroke. After returning, the gripper means 32
The steel wire 11 is gripped. That is, this procedure A is an operation of moving the gripping position of the PC steel wire 11 by the gripper means 32 backward.

* Procedure B: The towing jack 33 is driven by the towing device 30 to move the gripper body 31 forward by a predetermined stroke. Thereby, the plurality of propulsion pipes 61 are pressed forward through the shield machine 2 connected by the PC steel wire 11 to be propelled and moved. Along with this propulsion movement, the shield machine 2 drives the bulkhead jack 7 to move the bulkhead 5 rearward, and the backfill material 21 that has been cast in the shell 3 is placed in the ground behind the shell 3. Install. That is, this procedure B is an operation of moving the plurality of propulsion pipes 61 forward and installing the backfill material 21 in the underground space after the propulsion pipes 61 have advanced.

In the procedure B, the propulsion pipe 61 introduced into the working shaft 50 is appropriately dismantled, and is sequentially carried out to the ground via the rough terrain crane 42 and the like. Also, the frictional force between the shell 3 of the shield machine 2 and the ground is not constant, and the PC steel wire 1
The posture of the shell 3 may be lost while the shell 3 is being pulled through 1 (for example, the center axis of the shell 3 and the center axis of the propulsion pipe 61 are shifted). In such a case, the plurality of direction correcting jacks 10 of the shield machine 2 are selectively driven to drive the shell 3
Correct the posture of the player. For example, assuming that the front side of the shell 3 is inclined obliquely downward in FIG. 5, the ram 10 a of the direction correcting jack 10 shown in FIG. 5 is protruded to move the shell 3 counterclockwise in FIG. 5. Rotate to correct. Thus, the collapse of the posture of the shield machine 2 can be immediately corrected, and the operation can be continued.

* Procedure C: In the shield machine 2, the bulkhead jack 7 is driven to return the bulkhead 5 to the front with respect to the shell 3, and the backside of the bulkhead 5 (shell body) 3), and the backfill material 21 is cast and filled.

By sequentially repeating the above procedures A, B and C, a plurality of propulsion pipes 61 are sequentially introduced into the working shaft 50 (the right side in FIG. 1), and after these propulsion pipes 61 are propelled and removed. The backfill material 21 is sequentially driven and placed in the underground space. As a result, the propulsion pipe 61 is removed from the ground, and the backfill material 21 is filled in the ground instead, and the tunnel 6
Zero backfill is complete. (After that, backfilling of the working shaft 50 and the like is performed as necessary, but since this is performed using a known technique, the description is omitted.)

As described above, according to the present embodiment, the dismantling of the propulsion pipe 61 is not performed in the shield machine 2 but in the working shaft 50 having a sufficient working space. Is improved. As a result, it is also economical. Further, since it is not necessary for an operator to enter the inside of the shield machine 2, safety is high. Further, since there is no need to excavate the earth and sand around the existing tunnel 60, the operation is not troublesome and is economical. Can be constructed in a short period of time and has low noise.

In particular, since the backing material (not shown) on the outer periphery of the propulsion pipe 61 is uniformly cut and removed by the wire saw 91, the periphery of the propulsion pipe row 62 is cut off from the ground and the propulsion pipe 6 is cut off.
When propelling and removing 1, the frictional resistance with the ground is small and the propulsion can be performed smoothly. Also, the end 61 of the propulsion pipe 61
Since the openings (openings of the wellhead) in a and 61b are only the portions through which the wire saw 91 passes, the water stopping process is easy.
Further, since the wire saw device 90 can be divided, the wire saw device 90 is not restricted by the shape of the working shaft 50, and can be adopted in various environments.

In this embodiment, since the working shaft 50 is formed by using the existing manhole 65, the labor for the construction can be reduced as compared with the case where a new shaft is constructed.

The PC steel wire 11 for pulling the shell 3 is
As shown by reference numeral 11 ′ (two-dot chain line) in FIGS. 5 and 6,
A plurality may be connected not to the inside of the shell 3 but to the outer periphery of the shell 3. By connecting to the outer periphery, the posture of the shell 3 is less likely to collapse during towing.
0 can be omitted. ). In addition, since it is not necessary to arrange a PC steel wire inside the shield machine 2 or inside the propulsion pipe 61, it is easy to secure a work space, which is convenient. Particularly, in the present embodiment, the shield machine 2 is connected to the propulsion pipe 61.
Since the cutting of the propulsion pipe 61 and the ground 80 is performed before mounting the PC steel wire, a method of arranging the PC steel wire on the outer peripheral side of the propulsion pipe 61 can be easily realized.

Further, a wire saw device other than the wire saw device 90 described in the above embodiment may be employed. Further, the setting mode of the pulleys 93D and 93E when cutting with the wire saw 91 can be other than the mode described in the above-described embodiment.

Further, in the above-described embodiment, an example is shown in which the existing tunnel 60 is backfilled. However, the tunnel 60 can be updated to a new tunnel. For example, after performing the friction cutting step in the same manner as in the above-described embodiment, the propulsion pipe laying step is performed in the same manner as the conventional propulsion method instead of the tunnel backfilling step. That is, a new propulsion pipe is propelled from the one working shaft 50 underground by a suitable main jack or the like. At this time, the existing propulsion pipe row 62 is moved to the other working shaft 5 by a new propulsion pipe propelled underground.
Press towards zero. Since the existing propulsion pipe row 62 has reduced friction with the ground due to the friction cutting process, the propulsion pipe row 62 is pressed by a new propulsion pipe and propelled easily. In this way, a new propulsion pipe is sequentially added to and propelled from one of the working shafts 50, and the propulsion tubes 61 of the propulsion tube row 62 are sequentially pushed out to the other working shaft 50, and the propulsion pushed out to the working shaft 50. The tubes 61 are sequentially dismantled and removed.
By repeating this operation, the existing propulsion pipe row 62 is updated and laid on the propulsion pipe row including a new propulsion pipe, and the propulsion pipe laying process is completed. As described above, when the tunnel removing method according to the present invention is applied, the tunnel can be easily updated.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing a tunnel backfilling step.

FIG. 2 is a schematic side sectional view showing a friction cutting step.

FIG. 3 is a detailed side view showing the inside of a working shaft and the like.

FIG. 4 is a sectional view of a propulsion pipe and the like in a friction cutting step.

FIG. 5 is an enlarged view around a tunnel backfilling device.

FIG. 6 is a sectional view taken along line A-A ′ of FIG. 5;

[Explanation of symbols]

 Reference Signs List 21 backfilling material 50 shaft (operating shaft) 60 tunnel 61 propulsion pipe 62 propulsion pipe row 65 existing manhole (human hole) 80 ground 90 sawing means, wire saw (wire saw) 91 driving device (wire saw machine)

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kikuo Ishida 1-9-1, Nakase, Mihama-ku, Chiba-shi, Chiba F-term in Mitsui Construction Co., Ltd. Makuhari Main Store 2D054 AA06 AA10 AC18 BA10

Claims (6)

[Claims] In a tunnel removing method for removing a tunnel constructed by laying a plurality of propulsion pipe rows in the ground by a propulsion method, a linear saw means is provided for the propulsion pipe row to be removed. The propulsion tube array is disposed outside both ends of the propulsion tube array, the propulsion tube array is cut off from the ground side by the sawing means, and one end of the propulsion tube array is propelled toward the other end. A tunnel removal method characterized in that these propulsion pipe rows are removed from the ground by propulsion. 2. The method according to claim 1, wherein when the sawing means cuts the propulsion pipe row from the ground side, a lubricating material is injected between the propelling pipe row and the ground side cut off from each other. 1. The tunnel removal method according to 1. 3. The saw means is a wire saw formed in a loop shape, wherein the wire saw is disposed outside and inside the propulsion tube row in a folded shape at both ends of the propulsion tube row. The method for removing a tunnel according to claim 1. 4. The propulsion pipe row is laid so as to connect between shafts, and the wire saw is arranged such that a driving device for driving the wire saw is installed in the shaft. The tunnel removing method according to claim 3, wherein 5. The tunnel to be removed has the propulsion pipe row and an existing manhole connected to an end of the propulsion pipe row, and the shaft uses the existing manhole. The method for removing a tunnel according to claim 4, wherein the tunnel is formed. 6. When the propulsion tube rows are propelled and removed from the ground by the tunnel removing method according to any one of claims 1 to 5, they are backfilled in the underground space after the propulsion tube rows have been propelled. A method for backfilling a tunnel, comprising installing a material and backfilling the tunnel.