JP2001227299A - Tunnel back filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by preventing intrusion of sediment from an engagement part of front and rear barrels, and by improving the sealability in a tunnel back filling device. SOLUTION: A barrel body 11 is composed of a front barrel 12, an intermediate barrel 13 and a rear barrel 14, the front barrel 12 and the intermediate barrel 13 are advanced by extending a propulsion jack in a state of an engagement part of the intermediate barrel 13 and the rear barrel 14 sealed by a rear sealing device 81 to excavate the outer circumference of an existing tunnel T by a cutter head 17. Simultaneously, the existing tunnel T is dismantled in a working space in the barrel body 11, the rear barrel 14 is advanced by the contraction of the propulsion jack, and the back filling material is filled in a rear space part to back fill the tunnel. The grease is poured into an engagement space part 88 corresponding to the volumetric change by the rear sealing device 81 when advancing the rear barrel 14 by the contraction of the propulsion jack 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel backfill apparatus applied to an operation for disassembling and backfilling a tunnel structure buried underground.

[0002]

2. Description of the Related Art As an apparatus for removing and backfilling a tunnel already constructed underground, for example, Japanese Unexamined Patent Publication No.
No. 90, there is a “tunnel backfill method and shield backfill device”.

What is disclosed in the “tunnel backfill method and shield backfill device” described in this publication is as follows:
An inner cylinder fitted to the outer diameter of the segment (tunnel) is provided, and an outer shell is connected to the inner cylinder with a partition, and an annular cutter (face plate) is provided in front of the partition between the inner cylinder and the outer shell. On the other hand, a propulsion jack is provided behind the partition wall, and a core cutter that breaks the segment in the outer shell,
A casting pipe for ejecting backfill material is provided at the rear.

Therefore, the inner cylinder and the outer shell are advanced by the propulsion jack while the cutter is rotated by the motor, so that the outer periphery of the segment is excavated in a ring shape by the cutter, and the space formed by the forward movement of the apparatus is formed. While the backfill material is ejected from the casting pipe to the portion and backfilled, the existing segment can be broken and removed by the core cutter.

[0005]

By the way, this tunnel structure is dismantled by excavating the outer periphery of the tunnel structure,
When filling the space where the tunnel was removed with backfill material and backfilling, the device itself moves forward with the excavation reaction force from the surrounding ground and this tunnel structure, and the backfill material is in the rear. It is necessary to provide a partition so as not to penetrate into the space. Therefore, in general, the body surrounding the outer peripheral portion of the tunnel structure is composed of a front body and a rear body having substantially the same outer diameter, and the front outer peripheral surface having a smaller diameter of the rear body is fitted to the rear inner peripheral surface of the front body. At the same time, both trunks can be extended and contracted by installing propulsion jacks. In this case, a pair of front and rear seal members are provided at the rear end inner peripheral portion of the front trunk and the front end outer peripheral portion of the rear trunk so that the excavated earth and sand do not enter the fitting portion between the front trunk and the rear trunk. .

However, if the front outer peripheral surface of the rear trunk is fitted to the rear inner peripheral surface of the front trunk so that they can be extended and contracted with each other, the excavated earth and sand around the periphery is compressed at the time of contraction, so that the inner excavation is made from the fitting part of the two trunks. There is a problem that it invades. In order to prevent this, seal members are respectively attached to the inner peripheral portion at the rear end of the front trunk and the outer peripheral portion at the front end of the rear trunk. The volume of the space closed by each seal member changes at the fitting portion. That is, when the front trunk and the rear trunk are contracted by the propulsion jack, the volume of the space closed by each trunk and each seal member increases,
Here, a negative pressure is generated. Then, there is a problem in that the excavated earth and sand (muddy water) is sucked by the negative pressure, and enters the inside beyond the sealing surface of the sealing member. In this case, it is conceivable to enhance the sealing performance by increasing the pressing force of the sealing member against the sealing surface, but this increases the fitting force between the front body and the rear body, and it is necessary to increase the driving force of the propulsion jack. This leads to an increase in size and cost.

The present invention is intended to solve such a problem, and it is intended to improve the reliability by preventing the intrusion of earth and sand from the fitting portions of the front and rear trunks, thereby improving the reliability of the tunnel filling. It is an object to provide a return device.

[0008]

According to a first aspect of the present invention, there is provided a tunnel backfilling apparatus for removing and backfilling a cylindrical tunnel structure buried underground. A front body and a rear body each having a cylindrical shape having a diameter larger than that of the tunnel structure are rotatably supported at a front portion of the front body. And a revolving structure having a cutter capable of excavating the outer periphery of the tunnel structure, and a propulsion reaction force from the surrounding ground or the tunnel structure being provided between the front body and the rear body to advance the body. A propulsion jack, sealing means having front and rear seal members mounted so as to form a space in a fitting portion of the front body and the rear body, and filler injecting means for injecting a filler into the space. From the working space in the fuselage It is characterized in that comprises a dismantling means for dismantling the Le structure.

Further, in the tunnel backfilling device according to the second aspect of the present invention, the front trunk and the rear trunk are contracted by the operation of the propulsion jack and are accommodated in the rear trunk, and the front trunk and the rear trunk are extended when the front trunk and the rear trunk are extended. A partitioning means is provided which projects outward from the rear trunk and presses against the inner wall surface of the excavation tunnel.

Further, in the tunnel backfilling device according to the third aspect of the present invention, the front trunk and the rear trunk are contracted by the operation of the propulsion jack and are accommodated in the rear trunk, while the front trunk and the rear trunk are extended when the front trunk and the rear trunk are extended. A partitioning means is provided which projects outward from the rear trunk and presses against the inner wall surface of the excavation tunnel.

Further, in the tunnel backfilling device of the invention according to claim 4, the body is constituted by a front body, a middle body and a rear body,
The front trunk and the middle trunk are flexibly connected to each other so that the front trunk and the middle trunk can be flexed by the bending jack, and the middle trunk and the rear trunk are connected to be movable back and forth so as to be movable by the propulsion jack. And

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic cross section of a tunnel backfilling device according to an embodiment of the present invention, FIG. 2 is a cross section taken along line II-II of FIG. 1, FIG. 3 is a cross section taken along line III-III of FIG. 1, and FIG. FIG. 5 is a front cross-sectional view of a tunnel backfilling device showing a device, FIG. 5 is a cross-sectional view of a sealing member constituting a front sealing device, FIG. 6 is a rear cross-sectional view of a tunnel backfilling device showing a rear sealing device, and FIG. 3 shows a rear section of the tunnel backfill device represented.

As shown in FIGS. 1 to 3, the tunnel backfill apparatus of this embodiment dismantles and removes an existing tunnel T as a tunnel structure already buried in the ground, and at the same time, removes the tunnel. In this embodiment, the existing tunnel T is constituted by an iron segment S connected by bolts, and cement mortar is inserted around the outside of the segment S. I have.

In this tunnel backfilling device, the body 11 is composed of a front body 12, a middle body 13 and a rear body 14 which are slightly larger in diameter than the existing tunnel T and have a cylindrical shape. Although the outer diameter is almost the same as that of the trunk 13,
The rear trunk 14 is slightly smaller. An inner cylinder 15 is mounted inside the front body 12, and a ring-shaped support wall 16 is fixed to the rear. The front body 12 has a cutter as a revolving body having substantially the same outer diameter at the front end. Head 17 is a bearing 18
And a seal member 19 so as to be pivotable.
The cutter head 17 has a plurality of cutter bits 2 at its front end.
0 and a disk cutter 21 are attached, and a ring gear 22 having internal teeth is fixed to a rear end portion. On the other hand, a plurality of drive motors 23 are mounted on the support wall 16 of the front body 11, and a pair of universal joints 25, 2 are mounted on a drive shaft 24 of each drive motor 23.
The drive gears 28 are connected via the connecting rod 6 and the connecting rod 27, and each drive gear 28 is engaged with the ring gear 22.

Accordingly, when each drive motor 23 is driven,
The driving force of the drive shaft 24 is adjusted by the universal joint 25, the connecting rod 27,
The cutter head 17 can be rotated via a ring gear 18 that is transmitted to a drive gear 28 via a universal joint 26 and meshes with the drive gear 28. And then,
A plurality of cutter bits 2 rotating together with the cutter head 17
The outer periphery of the existing tunnel T can be excavated by the 0 and the disc cutter 21.

The front end of the middle body 13 is fitted to the inner periphery of the rear end of the front body 12 by a seal member 29 so as to be freely bent.
Between the support wall 16 of the front body 12 and the support wall 30 of the middle body 13, a plurality of center jacks 31 are provided. Therefore, by changing the expansion and contraction strokes of the plurality of center folding jacks 31, the front trunk 12 can be bent with respect to the middle trunk 13 in accordance with the existing direction of the existing tunnel T, and the excavation direction can be corrected.

The rear body 14 has a front end fitted to the inner periphery of the rear end of the middle body 13 and is movable along the excavation direction by fitting a guide pin 32 and a guide cylinder 33. ,
A plurality of propulsion jacks 35 are provided between the support wall 30 of the middle trunk 13 and the support wall 34 of the rear trunk 14. Therefore, by extending the plurality of propulsion jacks 35, the front trunk 12, the middle trunk 13 and the like can be advanced with respect to the rear trunk 14. A plurality of grippers 36 are attached to the rear portion of the rear body 14 at equal intervals in the circumferential direction, and can be pressed against the wall surface of the tunnel whose outer peripheral surface is excavated by supplying hydraulic pressure. Further, a partition 37 is formed at the rear end of the rear trunk 14, and a plurality of backfill material supply devices 38 for filling the space removed from the existing tunnel T are mounted on the partition 37, and the partition 37 is backfilled. A collapse exploration jack 39 for inspecting the filling state of the material is mounted. As the backfill material, a material obtained by appropriately blending a solidifying material with sand is preferable.

A guide beam 40 is provided at the center of the body 11 along the direction of excavation, and the rear end is connected to the support wall 34 of the rear body 14. The front end of the guide beam 40 extends to the inside of the existing tunnel T ahead of the cutter head 17, a reaction force receiving ring 41 is fitted on the outer periphery, and a towing jack 42 is installed between the two. Have been. The reaction force receiving ring 41 has a plurality of arms 43 extending in a radial direction, and a gripper 44 attached to a tip portion of the ring 43 is gripped by a gripper jack 45 to an existing tunnel T.
It can be freely pressed against the inner wall surface. In front of the reaction receiving ring 41, a reaction receiving member (not shown) is firmly fixed to the existing segment S constituting the existing tunnel T, and the reaction receiving ring 41 is attached to the reaction receiving rod 46.
Is connected to this reaction force receiving member.

A moving ring 47 is mounted at an intermediate portion of the guide beam 40 so as to be movable along the digging direction, and can be moved by a moving jack 48. And
A swivel ring 49 is pivotally supported by the moving ring 47 and can be swiveled by a swivel motor 50.
A segment removing device 51 is mounted on the revolving ring 49. The segment removing device 51 has a bolt loosening device (not shown) that loosens a bolt that connects the existing segments S. When the segment S is displaced in the radial direction to grip the disassembled segment S and is placed at a predetermined position, A hoist (not shown) carries the segment S out of the existing tunnel T.

Further, a mud feeding pipe 52 and a mud discharging pipe 53 are disposed in the guide beam 40, and one end of the pipe is bent upward or downward to pass between the front trunk 11 and the inner cylinder 15 to be forward. And open to the rear of the cutter head 17, while the other end is extended to the front inside the existing tunnel T and is connected to the excavated soil treatment equipment outside. In addition, the front trunk 12
A plurality of retraction preventing jacks 54 are mounted on the support wall 16 at equal intervals in the circumferential direction, and can be pressed against the segment S at the end of the existing tunnel T.

By the way, in the tunnel backfilling device of the present embodiment, the tunnel T buried in the soft ground can be removed, and excavation is performed while supplying muddy water.
Since it is necessary to reliably prevent infiltration of muddy water into the fuselage 11 during the work, a front seal device 61 for stopping water in a sliding portion with the existing tunnel T is provided at a front portion of the fuselage 11. . Further, in the tunnel backfilling device of the present embodiment, since the space portion from which the existing tunnel T has been removed is filled with the backfill material and backfilled, infiltration of muddy water and the backfill material into the fuselage 11 during the operation. Must be reliably prevented,
A rear sealing device (seal means) 81 for stopping water at a fitting portion between the middle body 13 and the rear body 14 is provided at a rear portion of the body 11, and a rear body 14.
A backflow prevention device (partitioning means) 101 is provided to stop the backflow of the backfill material from flowing forward by stopping water from flowing into the excavation tunnel wall.

In the front sealing device 61, as shown in FIGS. 4 and 5, on the inner peripheral surface of the inner cylinder 15 of the front body 11, a first pressure-type sealing member 62, a second and a third Pressure-type seal members 63 and 64 and a seal member 65 are provided. The first pressure-type seal member 62 has a ring-shaped slide-type seal case 68 having a pair of front and rear seal members 66 and 67 that can slide along the inner peripheral surface of the inner cylinder 15 along the digging direction. The sliding seal case 68 is attached to the inner peripheral side concave portion 69 and is made of rubber. The hollow seal 70 expands and contracts by supplying and discharging a fluid (for example, oil, water, etc.) into and from the inside. It is configured.
The hollow seal 70 is connected to a supply / discharge pipe 71 for supplying and discharging a fluid. A plurality of seal slide jacks 72 are arranged inside the inner cylinder 15 behind the first pressurizing seal member 62 at equal intervals in the circumferential direction. The distal end of the drive rod 73 is connected to the support walls 16, 30 via brackets 74, 75.

Therefore, when hydraulic pressure is supplied into the hollow seal 70 of the first pressurized seal member 62 through the supply / discharge pipe 71 by a hydraulic supply / discharge device (not shown), the hollow seal 70 expands, and the hollow seal 70 expands due to the expansion force. Can be pressed against and adhered to the outer peripheral surface of the existing tunnel T on the surface to stop water, and the sealing members 66 and 67 of the sliding seal case 68 can be pressed against and adhere to the inner peripheral surface of the inner cylinder 15 to stop water. . On the other hand, when the hydraulic pressure is discharged from the inside of the hollow seal 70, the hollow seal 70 contracts, and the hollow seal 70 is separated from the outer peripheral surface of the existing tunnel T. In this state, the hollow seal 70 is extended by extending the seal slide jack 72. Seal 7
0 can be moved forward.

The second pressurizing seal member 63 has a tongue shape, a base end portion of which is fixed to the inner cylinder 15 via an attachment ring 76 and a tip end portion of which extends rearward.
And a hollow member 78 which is mounted between the inner cylinder 15 and the tongue piece seal 77, is made of rubber, has a tubular shape, and is capable of expanding and contracting by supplying and discharging a fluid (eg, oil, water, etc.) therein. It is composed of The hollow member 78 is connected to a supply / discharge hole 79 formed in the inner cylinder 15 for supplying / discharging the fluid.

Accordingly, when hydraulic pressure is supplied into the hollow member 78 of the second pressurized seal member 63 through the supply / discharge hole 79 by a hydraulic supply / discharge device (not shown), the hollow member 78 expands,
Due to the expansion force, the tip of the tongue seal 77 can be pressed against and adhered to the outer peripheral surface of the existing tunnel T to stop the water. When the hydraulic pressure is discharged from the hollow member 78, the hollow member 78 contracts, and the tongue seal seals. The tip of 77 can be separated from the outer peripheral surface of the existing tunnel T.

The third pressurizing seal member 64 has substantially the same structure as that of the second pressurizing seal member 63.
By supplying / discharging the hydraulic pressure via 9, it is possible to expand and contract in synchronization. The base end of the seal member 65 is fixed to the inner cylinder 15 and the front end thereof extends rearward, and is constantly pressed against the outer peripheral surface of the existing tunnel T to stop water.

In the rear sealing device 81, FIG.
As described above, as described above, the front end of the rear trunk 14 is fitted to the inner periphery of the rear end of the middle trunk 13, and both are movable along the excavation direction. A seal housing recess 82 is formed along the circumferential direction on the inner peripheral surface of the rear end of the middle body 13, and a seal member 84 having a seal piece 83 at the rear is mounted in the seal housing recess 82. On the other hand, a seal housing recess 85 is formed along the circumferential direction on the outer peripheral surface of the front end of the rear trunk 14, and a seal member 87 having two seal pieces 86 at the rear is mounted in the seal housing recess 85. Therefore, when the middle body 13 and the rear body 14 are fitted together, the seal piece 83 of the seal member 84 of the middle body 13 presses against the outer peripheral surface of the rear body 14, and the seal piece 86 of the seal member 87 of the rear body 14 is pushed inward. Body 1
By pressing against the inner peripheral surface of No. 3, a fitting space portion 88 is formed here. A grease supply path (filling material injection means) 90 is connected to the fitting space portion 88 through a through hole 89 of the rear body 14.
Is connected to an opening / closing valve 91 and a grease supply source 92.

Therefore, when the propulsion jack 35 is contracted,
When the middle body 13 and the rear body 14 approach each other, the fitting space 88
When the volume increases, the opening / closing valve 91 is opened and grease is supplied from the grease supply source 92 to the fitting space 88 from the through hole 89 through the grease supply passage 90. In this way, when negative pressure is generated due to an increase in the volume of the fitting space 88, muddy water and backfill material are prevented from entering the inside from the sealing surface of the sealing member 84. When the propulsion jack 35 is extended, the middle trunk 13 and the rear trunk 1
4 separates the volume of the fitting space 88, but at this time, by closing the open / close valve 91, the grease in the fitting space 88 is pushed out from the sealing surface of the sealing member 84 to the outside. Will only be

Further, in the backflow prevention device 101, as shown in FIG. 7, a small diameter portion 14b having a smaller diameter than the main body portion 14a is formed at the rear end of the rear body 14, and the small diameter portion 1b is formed.
A ring-shaped hollow seal member 102 is provided on the outer periphery of 4b.
Are provided, and the front and rear ends are mounting brackets 103, 104 and bolts 10
It is fixed from 5,106. The hollow seal member 102 is provided with a hydraulic supply / discharge passage 108 through a through hole 107 of the rear body 14.
The opening / closing valve 109 and a hydraulic supply / discharge source 110 are connected to the hydraulic supply / discharge path 108.

Therefore, when the propulsion jack 35 is extended,
When the middle body 13 advances with respect to the rear body 14, the small-diameter portion 14
At this time, the opening / closing valve 109 is opened and the hydraulic supply / discharge source 110 passes through the hydraulic supply / discharge passage 108 so that the through hole 107 is exposed.
Supply hydraulic pressure into the hollow seal member 102 to expand it,
The outer peripheral surface is pressed against the inner wall surface of the excavation tunnel. By pressing the hollow seal member 102 against the inner wall surface of the excavation tunnel in this way, when the backfill material is discharged from the backfill material supply device 38 at the rear end of the rear trunk 14, the backfill material is Backflow is prevented from flowing forward from between the outer peripheral surface of the trunk 14 and the inner wall surface of the excavation tunnel. In addition,
When the propulsion jack 35 is contracted, the hydraulic pressure in the hollow seal member 102 is returned to the hydraulic supply / discharge source 110 through the hydraulic supply / discharge path 108 so that the outer diameter of the hollow seal member 102 is the same as that of the main body portion 14a. It can be stored inside.

Here, the operation of disassembling and removing the existing tunnel T and refilling it by the above-described tunnel backfill apparatus of the present embodiment will be described.

As shown in FIG. 1, the front part of the body 11, that is, the front body 11 and the cutter head 17 are fitted to the outer peripheral end of an existing tunnel T buried in the ground, and a plurality of grippers 3 are provided.
6 is pressed against the inner wall surface of the excavation tunnel to stabilize the body 11, and the gripper jack 45 presses the gripper 44 against the inner wall surface of the existing tunnel T to fix the reaction force receiving ring 41 and guide the beam 40. The rear trunk 14 can receive the excavation reaction force through the above.
Further, in the front sealing device 61, in a state in which each seal slide jack 72 is extended and the first pressure-type seal member 62 is moved forward, hydraulic pressure is supplied into the hollow seal 70 to expand the hollow seal 70. 70 is brought into close contact with the outer peripheral surface of the existing tunnel T, and the seal members 66 and 67 of the slide-type seal case 68 are brought into close contact with the inner peripheral surface of the inner cylinder 15 to stop water. On the other hand, the second and third pressure-type sealing members 63,
The hydraulic pressure is discharged from each of the 64 hollow members 78 and contracted,
The tongue seal 77 is separated from the outer peripheral surface of the existing tunnel T.

In this state, the driving motor 23 is driven to rotate the cutter head 17 via the ring gear 18, and the plurality of propulsion jacks 35 are extended to obtain a reaction force from the rear body 14. 12 and the inner trunk 13 are moved forward, and water is fed forward from the mud pipe 52. The plurality of cutter bits 20 and the disc cutters 21 mounted on the cutter head 17 excavate the outer periphery of the existing tunnel T, and drain pipes are formed. The excavated earth and sand is discharged from 53. When the front trunk 12 and the middle trunk 13 advance due to the extension of the propulsion jack 35, the existing tunnel T
By changing the expansion / contraction stroke of each of the half-fold jacks 31 according to the existing direction, the front trunk 12 is bent to correct the excavation direction.

Then, as shown in FIG.
Of the second and third pressurizing seal members 6 during excavation
Although the reference numerals 3 and 64 are separated from the outer peripheral surface of the existing tunnel T, the first pressurizing seal member 62 is in contact with the outer peripheral surface of the existing tunnel T and the inner peripheral surface of the inner cylinder 15 to stop water. That is, when the front body 11 advances, the seal slide jack 72 is contracted by the same amount as the advance amount of the front body 11, so that the hollow seal 70 does not move with respect to the existing tunnel T, and the close contact state between the two is established. The seal member 66, 67 of the sliding seal case 68 and the inner cylinder 15 are maintained.
Relatively slides in an intimate contact state with the inner peripheral surface. for that reason,
The hollow seal 70 adheres tightly to the rough outer surface of the excavated existing tunnel T according to the unevenness thereof,
In addition, since there is no relative movement, water can be reliably stopped and the hollow seal 70 is prevented from being damaged. Also, each sealing material 6 is applied to the inner peripheral surface of the machined inner cylinder 15 having no irregularities.
6, 67 are relatively moved in close contact with no gap,
Water can be reliably stopped, and breakage of the seal members 66 and 67 is prevented.

With the excavation work, in the working space inside the body 11, the segment removing device 51 moves to loosen the connecting bolt of the existing segment S to disassemble it, and the hoist operates to disassemble and unload the segment S. are doing. Also,
In the backflow prevention device 101, as shown in FIG. 7, when the front trunk 11 advances and the small diameter portion 14b of the rear trunk 14 is exposed from the middle trunk 13, the open / close valve 109 is opened and the hollow through the hydraulic supply / discharge passage 108 By supplying hydraulic pressure into the seal member 102 to expand the seal member 102 and press it against the inner wall surface of the excavation tunnel, the supplied backfill material at the rear end of the rear trunk 14 is prevented from flowing backward.

Thereafter, as shown in FIG. 1, when the propulsion jack 35 extends a predetermined stroke and excavates the outer periphery of the existing tunnel T by a predetermined distance, the forward movement of the front body 12 and the middle body 13 is stopped. Then, the hydraulic pressure is discharged from the inside of the hollow seal 70 and contracted by the front seal device 61, and the hollow seal 70 is separated from the outer peripheral surface of the existing tunnel T. on the other hand,
Each hollow member 7 of the second and third pressurized seal members 63 and 64
Hydraulic pressure is supplied to the inside of the tunnel 8 to expand it, and the tongue seal 77 is brought into close contact with the outer peripheral surface of the existing tunnel T to stop water. In this state, each seal slide jack 72 is extended to move the first pressure-type seal member 62 forward. At this time, the contracted hollow seal 70 moves away from the existing tunnel T, and the sealing members 66 and 67 of the sliding seal case 68 slide while lightly contacting the inner peripheral surface of the inner cylinder 15. Move. Therefore, since the hollow seal 70 does not slide on the rough outer surface of the existing tunnel T, breakage of the hollow seal 70 is prevented. On the other hand, since the torso seals 77 of the second and third pressurizing seal members 63 and 64 are tightly fitted without gaps in accordance with their unevenness because the front body 11 is stopped, and there is no relative movement. And the tongue piece seal 77 is prevented from being damaged.

When the outer periphery of the existing tunnel T is excavated for a predetermined distance and the front trunk 12 and the middle trunk 13 are stopped, the retraction preventing jack 54 is extended to press the segment S at the end of the existing tunnel T, The pressing of the plurality of grippers 36 against the inner wall surface of the excavation tunnel is released, and the backflow prevention device 101 reduces the hydraulic pressure in the hollow seal member 102 to a hydraulic supply / discharge path.
The hollow seal member 102 is contracted by being discharged through 108, and the outer diameter of the hollow seal member 102 is made the same as the main body portion 14a. In this state, the plurality of propulsion jacks 35 are contracted, and the rear trunk 14 moves forward and approaches the front trunk 12 and the middle trunk 13. At this time, the towing jack 42 is extended in synchronization with the propulsion jack 35, and the rear body 1 is guided to the reaction force receiving ring 41 via the guide beam 40.
By pulling the front 4 forward, the front trunk 12 and the middle trunk 13 are prevented from retreating.

At this time, the rear sealing device 81
As shown in FIG. 7, when the rear body 14 approaches the middle body 13, the volume of the fitting space 88 increases, so that the opening / closing valve 91 is opened and the fitting space 88 passes through the grease supply passage 90. Supply grease similar to increasing volume.
Therefore, muddy water and backfill material do not enter the inside of the fitting space portion 88 from the sealing surface of the sealing member 84 without a negative pressure. Then, a plurality of backfill material supply devices 38 discharge and fill the backspace formed in the rear space formed by the advancement of the rear trunk 14, so that the backfill operation of this space can be performed. carry out.

When the body 11 moves a predetermined distance in this manner, the existing tunnel T is removed by a predetermined distance,
A predetermined distance tunnel can be backfilled. Thereafter, as described above, while the space between the front trunk 12 and the existing tunnel T is sealed by the front sealing device 61, the ground is excavated by the cutter head 17 by moving the front trunk 12 and the middle trunk 13 forward. The existing tunnel T will be dismantled. By repeating this, all the existing tunnels T are removed and the tunnels are backfilled.

When the front barrel 12 and the middle barrel 13 have advanced to some extent and approached the reaction force receiving ring 41, the gripper 36
While the rear trunk 14 is held at the inner wall surface of the excavation tunnel, the torsion jack 42 is extended in a state where the gripping of the reaction force receiving ring 41 by the gripper 44 is released. The operation may be performed by moving the ring 41 forward.

As described above, in the tunnel backfilling device of the present embodiment, the body 11 is constituted by the front body 12, the middle body 13, and the rear body 14, and the space between the front body 11 and the existing tunnel T is a front part. In the state sealed by the sealing device 61, the front trunk 12 and the middle trunk 13 are advanced by the extension of the propulsion jack, and the outer periphery of the existing tunnel T is excavated by the cutter head 17, and at the same time, the existing tunnel T is formed in the working space in the fuselage 11. T is dismantled and the rear trunk 14 is advanced by contraction of the propulsion jack,
The back space is filled with backfill material to backfill the tunnel. A rear sealing device 81 is provided at a fitting portion between the middle body 13 and the rear body 14 to increase the volume of the fitting space 88 when the middle body 13 and the rear body 14 approach each other by the propulsion jack 35. The grease is supplied from the grease supply passage 90 to prevent the muddy water or the backfill material from entering the inside from the sealing surface of the sealing member 84 due to the negative pressure due to the increase in the volume of the fitting space 88.

In the above-described embodiment, the front sealing device 61 is constituted by the rubber tube-shaped first pressure-type seal member 62 and the tongue-shaped second and third pressure-type seal members 63 and 64. , But is not limited to this structure,
For example, a combination of a pressure-type seal member having a rubber tube shape or a pressure-type seal member having a tongue shape may be used. The number of combinations is not limited to three, and may be two or four or more.

In the above-described embodiment, the rear sealing device 81 can supply grease to the fitting space 88 formed by the sealing members 84 and 87 at the fitting portion between the middle body 13 and the rear body 14. However, one or more seal members may be provided between the seal members 84 and 87, and the fitting space may have a small capacity. Then, the backflow prevention device 101 expands by supplying hydraulic pressure to the hollow seal member 102 so as to be able to press against the inner wall surface of the excavation tunnel, but the bellows member may protrude outward.

Furthermore, in the above-described embodiment, the removal operation of the existing tunnel T is performed by loosening the fastening bolts of the segment S and disassembling the existing segment S. For example, the removal is performed by using a disk-shaped cutter or the like. May be dismantled.

[0046]

As described above in detail in the embodiment, according to the tunnel backfilling device of the first aspect of the present invention, the front body and the rear body having a cylindrical shape having a larger diameter than the tunnel structure are excavated. The front body is rotatably supported with a revolving body having a cutter capable of excavating the outer periphery of the tunnel structure at the front part of the front body. The front and rear seal members are formed so that the fuselage can be advanced by obtaining a propulsion reaction force from the surrounding ground or tunnel structure by the propulsion jack installed between them, and to form a space in the fitting part of the front trunk and the rear trunk. A sealing means having a mounting means, a filling material can be injected into the space by a filling material injection means, and a dismantling means for dismantling the tunnel structure from the working space in the fuselage is provided. When moving forward By injecting the filler material, a negative pressure state does not occur due to the increase in the volume of this space, and the infiltration of muddy water and the like from the sealing surface of the sealing member is prevented, and reliability is improved by improving the sealing performance. Performance can be improved.

According to the tunnel backfilling device of the second aspect of the present invention, since the outer diameter of the rear trunk is smaller than the outer diameter of the front trunk, excavated earth and sand around the front trunk and the rear trunk when contracted. Is not compressed and pushed into the fitting portion between the two bodies, so that a malfunction can be prevented.

Further, according to the third aspect of the present invention, the front trunk and the rear trunk are contracted by the operation of the propulsion jack and are accommodated in the rear trunk. Since the partitioning means that protrudes outward and presses against the inner wall surface of the excavation tunnel is provided, when the front body advances relative to the rear body, the partitioning means protrudes and presses against the inner wall surface of the excavation tunnel, The backfill injected into the rear end of the torso can be prevented from flowing forward.

Further, according to the tunnel backfilling device of the invention of claim 4, the trunk is composed of a front trunk, a middle trunk and a rear trunk,
The front body and the middle body are flexibly connected to each other and can be bent by the center bending jack, and the middle body and the rear body can be moved back and forth by the propulsion jack. By changing the extension / contraction stroke of the center folding jack according to the existing direction, the front trunk can be bent and the digging direction can be easily corrected.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a tunnel backfill apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a front sectional view of a tunnel backfilling device showing a front sealing device.

FIG. 5 is a sectional view of a seal member constituting the front seal device.

FIG. 6 is a rear cross-sectional view of the tunnel backfill device representing the rear sealing device.

FIG. 7 is a rear sectional view of a tunnel backfilling device showing the backflow prevention device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 body 12 front body 13 middle body 14 rear body 17 cutter head (revolving body) 23 drive motor 31 center folding jack 35 propulsion jack 38 backfill material supply device 40 guide beam 41 reaction force receiving ring 51 segment removal device (disassembly means) Reference Signs List 61 Front seal device 62 First pressurized seal member 63 Second pressurized seal member 64 Third pressurized seal member 72 Seal slide jack 81 Rear seal device (seal means) 84, 87 Seal member 88 Fitting space 90 Grease Supply path (filling material injection means) 101 Backflow prevention device 102 Hollow seal member 107 Hydraulic supply / discharge path T Existing tunnel (tunnel structure) S segment

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiro Fukushima 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Inside the Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Kenji Murayama 2-chome Konan, Minato-ku, Tokyo 15-2 Obayashi Gumi Tokyo headquarters (72) Inventor Tomoyuki Fukuda 2-2-1 Konan, Minato-ku, Tokyo F-term Obayashi Gumi Tokyo headquarters F term (reference) 2D054 AA02 AD02 AD17 BA05 FA06

Claims (4)

[Claims] 1. An apparatus for removing and refilling a cylindrical tunnel structure buried in the ground, wherein a front body and a rear body having a cylindrical shape having a diameter larger than that of the tunnel structure are formed in the excavation direction. A revolving body having a cutter rotatably supported along the front body and a cutter rotatably supported by a front portion of the front body and capable of excavating an outer periphery of the tunnel structure; A propulsion jack installed between the trunks to advance the fuselage by obtaining a propulsion reaction force from the surrounding ground or the tunnel structure, and mounted so as to form a space in a fitting portion between the front trunk and the rear trunk. Sealing means having the front and rear sealing members provided before and after, a filler injecting means for injecting a filler into the space, and dismantling means for dismantling the tunnel structure from a working space in the body. And tunnel backfill equipment. 2. The tunnel backfilling device according to claim 1, wherein the outer diameter of the rear trunk is smaller than the outer diameter of the front trunk. 3. The tunnel backfilling device according to claim 2, wherein the front trunk and the rear trunk are contracted by the operation of the propulsion jack and accommodated in the rear trunk, and the rear trunk is extended when the front trunk and the rear trunk are extended. A tunnel backfilling device provided with partition means for projecting outward from a trunk and pressing against an inner wall surface of an excavation tunnel. 4. The tunnel backfilling device according to claim 1, wherein the body comprises a front body, a middle body and a rear body, and the front body and the middle body are flexibly connected to each other by a center-folding jack. A tunnel backfilling device that is bendable and that the middle trunk and the rear trunk are connected to be movable back and forth so as to be movable by the propulsion jack.