JP3392796B2 - Tunnel backfill equipment and construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel backfilling apparatus and a construction method applied to work for disassembling and backfilling a tunnel structure buried in the ground.

[0002]

2. Description of the Related Art As an apparatus and method for removing and backfilling a tunnel already built in the ground, for example, "Tunnel backfilling method and shield backfilling apparatus" described in Japanese Patent Laid-Open No. 4-7490 is disclosed. There is.

What is disclosed in the "tunnel backfilling method and shield backfilling device" described in this publication is
An inner cylinder fitted to the outer diameter of the segment (tunnel) is provided, and an outer shell is connected to this inner cylinder with a partition wall, and an annular cutter (face plate) is provided in front of the partition wall 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,
It is provided with a casting pipe for ejecting the backfill material at the rear.

Therefore, by advancing the inner cylinder and the outer shell by the propelling jack while the cutter is rotated by the motor, the cutter excavates the outer periphery of the segment in an annular shape, and the space formed by advancing the device is formed. While the backfill material is ejected from the casting pipe to the portion to be backfilled, the existing segment can be broken and removed by the core cutter.

[0005]

By the way, when the ground in which the tunnel structure is buried is weak or when the shield backfilling device is a muddy type, the body of the device and the tunnel to be dismantled are It is necessary to prevent muddy water from entering the inside of the fuselage from the fitting part. However,
In the above-described conventional shield backfilling device, the inner peripheral surface of the inner cylinder is slidably fitted to the outer peripheral surface of the segment forming the tunnel, and the seal member is not attached. Therefore, it is not possible to reliably prevent water from entering the outer shell.

The present invention solves such a problem, and provides a tunnel backfilling device and a construction method capable of reliably preventing water from entering the body during the tunnel backfilling work and improving the sealing performance. The purpose is to do.

[0007]

The tunnel backfilling device according to the first aspect of the present invention for achieving the above object is a device for removing and backfilling a cylindrical tunnel structure buried in the ground. There is a body having a cylindrical shape having a diameter larger than that of the tunnel structure, a revolving body having a cutter rotatably supported by a front portion of the body and capable of excavating the outer periphery of the tunnel structure, Propulsion means for advancing the body by obtaining a propulsion reaction force from the ground or the tunnel structure, and an inner peripheral surface of the body disposed between the inner peripheral surface of the body and the outer peripheral surface of the tunnel structure. And of the tunnel structure
A first seal member that is in close contact with the outer peripheral surface and can stop water;
It is arranged on the inner surface of the body and on the outer surface of the tunnel structure.
A second seal member that is in close contact with water and is capable of stopping water, and the first seal
And the sealing member moving means capable of moving member in the longitudinal excavation direction, it is characterized in that comprises a dismantling means for dismantling the tunnel structure from the working space of the inner body.

Further, in the tunnel backfilling device according to the invention of claim 2, the first seal member has a ring shape and is movable by the seal member moving means, and the first seal member is slidably brought into contact with the inner peripheral surface of the body and stopped. While having a water-tight first seal and a second seal capable of adhering to the inside and adhering to the outer peripheral surface of the tunnel structure with respect to the first seal to stop the water, The second seal member has a ring shape and is fixed to the inner peripheral surface of the body, and is supplied with a fluid to expand the second seal member so as to be in close contact with the outer peripheral surface of the tunnel structure to stop water. Is characterized by.

Further, in the tunnel backfilling device of the invention of claim 3, the second seal constituting the first seal member is an endless rubber tube along the circumferential direction of the body,
When the fluid is supplied to the inside of the tunnel structure and expands, the surface of the tunnel structure is brought into surface contact with water to stop water.

According to the tunnel backfilling method of the invention of claim 4, the body is fitted to the outer peripheral end of the tunnel structure buried in the ground, and first, the inner peripheral surface of the body and the tunnel structure are fitted. The outer periphery of the tunnel structure by advancing the body and rotating the cutter with one of the pair of front and rear seal members disposed between the outer peripheral surface and the outer peripheral surface expanded and the other contracted. The outer peripheral surface of the one seal member is in sliding contact with the inner peripheral surface of the body, the inner peripheral surface is in close contact with the outer peripheral surface of the tunnel structure to stop water, and then the cutter is After excavating for a predetermined distance, the fuselage is stopped, and then the one sealing member is advanced while the one sealing member is contracted and the other sealing member is expanded, and at this time, the other sealing member is Inner peripheral surface of body and outer peripheral surface of the tunnel structure And stop water by contact, is characterized in that the backfill fuselage rear with dismantling the tunnel structure from the inner body during this operation.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic cross section of a tunnel backfill device according to a first embodiment of the present invention, FIG. 2 is a cross section taken along line II-II of FIG.
FIG. 3 is a sectional view taken along line III-III in FIG. 1, FIG. 4 is a front sectional view of a tunnel backfilling device representing a front sealing device, FIG. 5 is a sectional view of a seal member constituting the front sealing device, and FIG. Shows a rear cross section of the tunnel backfill device, and FIG. 7 shows a rear cross section of the tunnel backfill device showing the backflow prevention device.

As shown in FIGS. 1 to 3, the tunnel backfill device 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 T. In the present embodiment, the existing tunnel T is composed of an iron segment S connected by bolts, and cement mortar is inserted around the outer periphery of the segment S. There is.

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. The outer diameter is almost the same as the body 13,
The rear body 14 is slightly smaller. An inner cylinder 15 is attached to the inside of the front case 12, and a ring-shaped support wall 16 is fixed to the rear side of the front case 12. The front case 12 is a cutter as a revolving structure having an outer diameter of substantially the same at the front end. Head 17 is bearing 18
And a seal member 19 so as to be freely rotatable.
This cutter head 17 has a plurality of cutter bits 2 at the front end.
0 and a disk cutter 21 are attached, and a ring gear 22 having internal teeth is fixed to the rear end portion. On the other hand, a plurality of drive motors 23 are attached to the support wall 16 of the front case 11, and a pair of universal joints 25, 2 is attached to the drive shaft 24 of each drive motor 23.
A drive gear 28 is connected via 6 and a connecting rod 27, and each drive gear 28 meshes with the ring gear 22.

Therefore, when each drive motor 23 is driven,
The driving force of the drive shaft 24 is the universal joint 25, the connecting rod 27,
The cutter head 17 can be rotated via the ring gear 18 which is transmitted to the drive gear 28 via the universal joint 26 and meshes with the drive gear 28. And at this time,
Multiple cutter bits 2 that rotate with the cutter head 17
0 and the disk cutter 21 can excavate the outer periphery of the existing tunnel T.

A front end portion of the middle body 13 is flexibly fitted to a rear end inner peripheral portion of the front body 12 by a seal member 29,
A plurality of center folding jacks 31 are provided between the support wall 16 of the front case 12 and the support wall 30 of the middle case 13. Therefore, by changing the expansion and contraction strokes of the plurality of center folding jacks 31, it is possible to bend the front case 12 with respect to the middle case 13 in accordance with the existing direction of the existing tunnel T and correct the excavation direction.

The front end portion of the rear body 14 is fitted to the inner peripheral portion of the rear end of the middle body 13, and the guide pin 32 and the guide cylinder 33 are fitted together so that the rear body 14 is movable in the excavation direction. ,
A plurality of propulsion jacks 35 are installed between the support wall 30 of the middle case 13 and the support wall 34 of the rear case 14. Therefore, by extending the plurality of propulsion jacks 35, the front body 12 and the middle body 13 can be moved forward with respect to the rear body 14. A plurality of grippers 36 are mounted on 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, the outer peripheral surface of which has been excavated, by supplying hydraulic pressure. Further, a partition wall 37 is formed at the rear end portion of the rear body 14, and a plurality of backfill material supply devices 38 for filling the space portion from which the existing tunnel T has been removed are attached to the partition wall 37 and the backfill material is backfilled. A collapse exploration jack 39 for inspecting the filling condition of the material is attached. As the backfill material, a material in which a solidifying material is appropriately mixed with sand is preferable.

A guide beam 40 is arranged in the center of the body 11 along the excavation direction, and its rear end is connected to the support wall 34 of the rear body 14. The front end portion of the guide beam 40 is extended to the inside of the existing tunnel T in front of the cutter head 17, the reaction force receiving ring 41 is fitted to the outer peripheral portion, and the traction jack 42 is installed between the two. Has been done. The reaction force receiving ring 41 has a plurality of arms 43 along the radial direction, and a gripper 44 attached to the tip end portion of the existing tunnel T by a gripper jack 45.
It can be pressed against the inner wall of the. Further, a reaction force receiving member (not shown) is firmly fixed to the existing segment S forming the existing tunnel T in front of the reaction force receiving ring 41.
It is connected to this reaction force receiving member via.

A moving ring 47 is movably mounted in the middle of the guide beam 40 along the excavation direction, and can be moved by a moving jack 48. And
A swivel ring 49 is rotatably supported on the moving ring 47 and can be swung by a swivel motor 50.
A segment removing device 51 is mounted on the swivel ring 49. The segment removing device 51 has a bolt loosening device (not shown) for loosening the bolts connecting the existing segments S to each other, and when the segment S disassembled by moving in the radial direction is gripped and 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, one end of which is bent upward or downward so as to pass through between the front body 11 and the inner cylinder 15 and forward. While extending to the rear of the cutter head 17, the other end extends to the front inside the existing tunnel T and is externally connected to the excavated soil treatment facility. The front torso 12
A plurality of receding prevention 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 apparatus of this embodiment, the tunnel T buried in the soft ground can be removed, and since the excavation is performed while supplying the muddy water,
Since it is necessary to reliably prevent the entry of muddy water into the body 11 during the work, a front seal device (sealing means) 61 for stopping the water sliding at the sliding part with the existing tunnel T is provided at the front part of the body 11. It is provided. In addition, in the tunnel backfilling device of the present embodiment, the space portion from which the existing tunnel T has been removed is filled with backfilling material and backfilled.
Since it is necessary to reliably prevent infiltration of muddy water and backfill material into the inside of the body 1, a rear sealing device 81 for stopping water at the fitting portion of the middle body 13 and the rear body 14 is provided at the rear part of the body 11. A backflow prevention device 101 is provided to prevent water from flowing back to the front of the backfill material by stopping water from the trunk 14 and the wall surface of the excavation tunnel.

In this front seal device 61, as shown in FIGS. 4 and 5, the first pressurizing seal member 62 and the second and third additional members are provided on the inner peripheral surface of the inner cylinder 15 of the front case 11. Pressure seal members 63, 64 and a seal member 65 are provided. The first pressurizing seal member 62 has a pair of front and rear seal members 66, 67 which are ring-shaped and are slidably contactable with the inner peripheral surface of the inner cylinder 15 along the excavation direction (first seal member). (Seal) 68 and the inner peripheral side recess 69 of the slide type seal case 68, which is made of rubber and has a tubular shape, and can expand and contract by supplying and discharging a fluid (for example, oil, water, etc.) inside. Hollow seal (second seal)
And 70. A supply / discharge pipe 71 for supplying / discharging the fluid is connected to the hollow seal 70.
The first pressurizing seal member 6 is provided inside the inner cylinder 15.
2, a plurality of seal slide jacks (seal member moving means) 72 are arranged at equal intervals in the circumferential direction, and the main body is connected to the seal case 68 of the first pressurization type seal member 62 and driven. The tip of the rod 73 is the support wall 1
6 and 30 via brackets 74 and 75.

Accordingly, when hydraulic pressure is supplied to the hollow seal 70 of the first pressurizing seal member 62 through the supply / discharge pipe 71 by a hydraulic pressure supply / discharge device (not shown), the hollow seal 70 expands, and the expansion force causes the hollow seal 70 to expand. Can be pressed and brought into close contact with the outer peripheral surface of the existing tunnel T to stop water, and the sealing members 66 and 67 of the slide type seal case 68 can be pressed and brought into close contact with 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 seal slide jack 72 is extended so that the hollow seal 70 is hollow. Seal 7
You can move 0 forward.

The second pressurizing seal member 63 has a tongue seal 77 having a tongue shape, the base end of which is fixed to the inner cylinder 15 via a mounting ring 76 and the tip of which extends rearward.
And a hollow member 78 which is mounted between the inner cylinder 15 and the tongue seal 77 to form a tubular shape made of rubber and which can be expanded and contracted by supplying and discharging a fluid (for example, oil, water, etc.) therein. It consists of and. The hollow member 78 is connected to a supply / discharge hole 79 formed in the inner cylinder 15 for supplying / discharging a fluid.

Therefore, when the hydraulic pressure is supplied to the hollow member 78 of the second pressure type seal member 63 through the supply / discharge hole 79 by the hydraulic pressure supply / discharge device (not shown), the hollow member 78 expands,
Due to the expansion force, the tip portion of the tongue seal 77 can be pressed and brought into close contact with the outer peripheral surface of the existing tunnel T to stop water, and when the hydraulic pressure is discharged from the hollow member 78, the hollow member 78 contracts and the tongue seal is formed. The tip of 77 can be separated from the outer peripheral surface of the existing tunnel T.

The third pressurizing type seal member 64 has substantially the same structure as the second pressurizing type seal member 63.
By supplying and discharging the hydraulic pressure via 9, it is possible to expand and contract synchronously. The seal member 65 has a proximal end fixed to the inner cylinder 15 and a distal end extending rearward to constantly press the outer peripheral surface of the existing tunnel T to stop water.

In the rear sealing device 81, as shown in FIG.
As described above, as described above, the front end portion of the rear body 14 is fitted to the inner peripheral portion of the rear end of the middle body 13, and both are movable in the excavation direction. A seal accommodating recess 82 is formed on the inner peripheral surface of the rear end of the middle body 13 along the circumferential direction, and a seal member 84 having a seal piece 83 on the rear side is attached to the seal accommodating recess 82. On the other hand, a seal accommodating recess 85 is formed along the circumferential direction on the outer peripheral surface of the front end of the rear body 14, and a seal member 87 having two seal pieces 86 on the rear side is attached to the seal accommodating recess 85. Therefore, when the middle body 13 and the rear body 14 are fitted to each other, 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 centered. Torso 1
By pressing against the inner peripheral surface of 3, the fitting space 88 is formed here. A grease supply passage 90 is connected to the fitting space 88 through a through hole 89 in the rear body 14, and an opening / closing valve 91 is connected to the grease supply passage 90.
And a grease supply source 92 are connected.

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 the grease supply source 92 supplies the grease from the through hole 89 to the fitting space 88 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 portion 88, muddy water and the backfill material are prevented from entering the inside from the sealing surface of the seal member 84. When the propulsion jack 35 is extended, the middle body 13 and the rear body 1
4 is separated from each other, the volume of the fitting space 88 is reduced. At this time, by closing the opening / closing valve 91, the grease in the fitting space 88 is pushed out from the sealing surface of the seal member 84 to the outside. It will only be done.

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

Therefore, when the propelling jack 35 is extended,
As the middle body 13 moves forward with respect to the rear body 14, the small diameter portion 14
Since b is exposed, the opening / closing valve 109 is opened at this time and the through hole 107 is opened from the hydraulic pressure supply / discharge source 110 through the hydraulic pressure supply / discharge path 108.
From the inside, the hollow seal member 102 is supplied with hydraulic pressure to be expanded,
The outer peripheral surface is pressed against the inner wall surface of the excavation tunnel. By thus pressing the hollow seal member 102 against the inner wall surface of the excavation tunnel, when the backfill material is discharged from the backfill material supply device 38 at the rear end portion of the rear body 14, the backfill material is removed. Backflow is prevented from being forward between the outer peripheral surface of the case body 14 and the inner wall surface of the excavation tunnel. In addition,
When the propulsion jack 35 is contracted, the hydraulic pressure inside the hollow seal member 102 is returned to the hydraulic pressure supply / discharge source 110 through the hydraulic pressure supply / discharge passage 108, so that the outer diameter of the hollow seal member 102 is made the same as that of the main body portion 14a, and the middle body 13 It can be stored inside.

Here, a description will be given of the work of backfilling after the existing tunnel T is dismantled and removed by the tunnel backfilling device of the present embodiment described above.

As shown in FIG. 1, the front portion of the body 11, that is, the front body 11 and the cutter head 17 are fitted to the outer peripheral end portion of the 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 the guide beam 40. The rear body 14 is capable of receiving the excavation reaction force via the.
Further, in the front seal device 61, while the seal slide jacks 72 are extended and the first pressurization type seal member 62 is moved forward, hydraulic pressure is supplied into the hollow seal 70 to expand the hollow seal 70. Water is stopped by bringing 70 into close contact with the outer peripheral surface of the existing tunnel T, and by bringing the respective seal members 66, 67 of the slide type seal case 68 into close contact with the inner peripheral surface of the inner cylinder 15. On the other hand, the second and third pressurizing seal members 63,
The hydraulic pressure is discharged from each hollow member 78 of 64 to contract,
The tongue seal 77 is separated from the outer peripheral surface of the existing tunnel T.

In this state, the drive motor 23 is driven to rotate the cutter head 17 via the ring gear 18 while the plurality of propulsion jacks 35 are extended to obtain a reaction force from the rear body 14 to obtain the front body. 12 and the middle body 13 are moved forward, water is sent forward from the mud pipe 52, and a plurality of cutter bits 20 and disk cutters 21 mounted on the cutter head 17 excavate the outer periphery of the existing tunnel T to discharge the mud pipe. The excavated soil is discharged from 53. When the front body 12 and the middle body 13 are advanced by the extension of the propulsion jack 35, the existing tunnel T
By changing the expansion / contraction stroke of each of the half-folded jacks 31 according to the existing direction, the front body 12 is bent to correct the excavation direction.

Then, as shown in FIG.
The second and third pressurizing seal members 6 are moved during the digging due to the forward movement of
Although 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 is advanced, the seal slide jack 72 is contracted by the same amount as the amount of advance 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 maintained. The sealing members 66 and 67 of the slide type seal case 68 and the inner cylinder 15 are maintained.
Slides relatively to the inner peripheral surface of the. for that reason,
The hollow seal 70 closely adheres to the rough outer surface of the excavated existing tunnel T according to the uneven state thereof,
Moreover, since there is no relative movement, water can be reliably stopped and the hollow seal 70 is prevented from being damaged. In addition, each sealing material 6 is applied to the machined inner peripheral surface of the inner cylinder 15 having no unevenness.
Since 6, 67 move relative to each other in close contact with no gap,
The water can be surely stopped and the seal members 66 and 67 are prevented from being damaged.

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

After that, as shown in FIG. 1, when the propulsion jack 35 extends a predetermined stroke to excavate the outer periphery of the existing tunnel T for a predetermined distance, the forward movement of the front body 12 and the middle body 13 is stopped. Then, in the front seal device 61, the hydraulic pressure is discharged from the inside of the hollow seal 70 to be contracted, 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 pressurizing seal members 63, 64
A 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 the 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 seal members 66 and 67 of the slide-type seal case 68 slide in a state of lightly contacting the inner peripheral surface of the inner cylinder 15. Move. Therefore, since the hollow seal 70 does not slide against the rough outer surface of the existing tunnel T, the hollow seal 70 is prevented from being damaged. On the other hand, since the front torso 11 is stopped, the tongue seals 77 of the second and third pressurizing seal members 63 and 64 closely adhere to each other according to the concave and convex state and there is no relative movement. Water can be stopped and the tongue seal 77 is prevented from being damaged.

When the front body 12 and the middle body 13 are stopped by excavating the outer periphery of the existing tunnel T for a predetermined distance, the retreat prevention jack 54 is extended to press the segment S at the end of the existing tunnel T, and The pressure contact with the inner wall surface of the excavation tunnel by the plurality of grippers 36 is released, and the backflow prevention device 101 controls the hydraulic pressure in the hollow seal member 102 to the hydraulic pressure supply / discharge path.
The hollow seal member 102 is discharged through 108 and contracts so that the outer diameter of the hollow seal member 102 becomes the same as that of the main body portion 14a. In this state, the plurality of propulsion jacks 35 are contracted to move the rear body 14 forward and approach the front body 12 and the middle body 13. At this time, the tow jack 42 is extended in synchronization with the propulsion jack 35, and the rear body 1 is moved to the reaction force receiving ring 41 via the guide beam 40.
4 is pulled forward to prevent the front body 12 and the middle body 13 from retracting.

At this time, with the rear seal device 81, as shown in FIG.
As shown in FIG. 4, when the rear body 14 approaches the middle body 13, the volume of the fitting space 88 increases, so the opening / closing valve 91 is opened to pass through the grease supply passage 90 to the fitting space 88. Supply grease similar to increasing volume.
Therefore, the fitting space portion 88 does not have a negative pressure, and muddy water or the backfill material does not enter the inside from the sealing surface of the sealing member 84. Then, the plurality of backfill material supply devices 38 discharge and fill the backspace material formed by the forward movement of the rear body 14 to fill the space portion with the backfill material. carry out.

In this way, when the body 11 moves for a predetermined distance, the existing tunnel T is removed for a predetermined distance, and
The tunnel can be backfilled for a predetermined distance. Thereafter, similarly to the above, while excavating the ground by the cutter head 17 by advancing the front body 12 and the middle body 13 in a state where the front body 12 and the existing tunnel T are sealed by the front sealing device 61. The existing tunnel T is dismantled. By this repetition, all the existing tunnels T are removed and the tunnels are backfilled.

When the front body 12 and the middle body 13 move forward to some extent and approach the reaction force receiving ring 41, the gripper 36
While holding the rear body 14 in position on the inner wall surface of the excavating tunnel by means of the gripper 44, the pulling jack 42 is extended in a state where the position holding of the reaction force receiving ring 41 by the gripper 44 is released to receive the reaction force against the guide beam 40. The ring 41 may be moved forward to perform the work.

As described above, in the tunnel backfill device of this embodiment, the body 11 is composed of the front body 12, the middle body 13 and the rear body 14, and the front portion between the front body 11 and the existing tunnel T is a front portion. In a state of being sealed by the sealing device 61, the front jack 12 and the middle barrel 13 are advanced by the extension of the propulsion jack to excavate the outer periphery of the existing tunnel T by the cutter head 17, and at the same time, the existing tunnel in the working space in the body 11 T is dismantled, the rear body 14 is advanced by contraction of the propulsion jack,
The back space is filled with backfill material to backfill the tunnel. The front seal device 61 is composed of a first pressure type seal member 62, second and third pressure type seal members 63 and 64, and a seal member 65, and the first pressure type seal member 62 is a seal slide. Since it is movable by the jack 72, the pressurizing seal members 62 and 6 can be moved when the front body 12 and the middle body 13 are moved forward and the rear body 14 is moved forward.
By properly using 3 and 64, it is possible to improve the sealing property and the durability.

In the above embodiment, the front seal device 61 is constituted by the rubber tube-shaped first pressurizing seal member 62 and the tongue-shaped second and third pressurizing seal members 63, 64. However, the structure is not limited to this.
FIG. 8 shows a cross-section of a main part of the front sealing device in the tunnel backfilling device according to the second embodiment of the present invention. It should be noted that members having the same functions as those described in the above-described embodiment are designated by the same reference numerals, and redundant description will be omitted.

That is, in the present embodiment, as shown in FIG. 8, the front seal device 111 includes the first pressure type seal member 6
2 and a second pressurizing seal member 112. The second pressurizing seal member 112 has a ring shape and is fixed to the inner peripheral surface of the inner cylinder 15, and a seal case 113 is attached to an inner peripheral side concave portion 114 of the seal case 113 to form a rubber tube. A hollow seal 115 that can be expanded and contracted by supplying and discharging a fluid (for example, oil, water, etc.) is formed inside the inner cylinder 15 for supplying and discharging the fluid. The supplied and discharged holes 116 are connected. Therefore, the supply / discharge hole 116 is provided by a hydraulic supply / discharge device (not shown).
When the hydraulic pressure is supplied to the hollow seal 115 of the second pressurizing seal member 112 through the hollow seal 115, the hollow seal 115 expands, and the expansion force presses the hollow seal 115 against the outer peripheral surface of the existing tunnel T so as to stop water. can do.

The combination of the front seal device is a rubber tube-shaped first pressure type seal member 62 and a tongue-shaped second pressure type seal member 63, or a rubber tube-shaped first pressure type seal member 62. The second pressurizing seal member 112 and the tongue-shaped members may be combined, and the number of combinations is not limited to three, and may be two or four or more.

Further, in the above-described embodiment, the rear seal device 81 can supply grease to the fitting space 88 formed by the seal 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 so that the fitting space portion has a small capacity. Then, in the backflow prevention device 101, the hollow seal member 102 is expanded by the hydraulic pressure and can be pressed against the inner wall surface of the excavation tunnel, but the bellows member may be projected outward.

Further, in the above-mentioned embodiment, the existing tunnel T is removed by loosening the fastening bolts of the segment S and disassembling the existing segment S. However, for example, cutting is performed by using a disc-shaped cutter or the like. You may dismantle it.

[0047]

As described above in detail in the embodiments, according to the tunnel backfilling device of the invention of claim 1, the tunnel structure is formed in the front portion of the cylindrical body having a diameter larger than that of the tunnel structure. A slewing body having a cutter capable of excavating the outer periphery is rotatably supported, and propulsion means obtains a propulsive reaction force from the surrounding ground or a tunnel structure to make it possible to move forward . Dense on the outer surface
The first seal member that can be worn to stop water and the tunnel structure
A second seal member, which is in close contact with the outer peripheral surface and is capable of stopping water , is provided, and the first seal member can be moved in the forward and backward directions by the seal member moving means to dismantle the tunnel structure from the working space in the body. is provided with the dismantling means, when cutter drilling by the fuselage forward, while water stopping between the outer peripheral surface of the inner of the body by operating the first sealing member peripheral surface and the tunnel structure, the first sealing member The second seal part when moving forward
The material is actuated to stop the water between the inner peripheral surface of the body and the outer peripheral surface of the tunnel structure, and it is possible to reliably prevent water from entering the body during tunnel backfilling work and improve the sealing performance. be able to.

According to the tunnel backfilling device of the second aspect of the present invention, the first seal member has a ring shape and can be moved by the seal member moving means, and the first seal member can slide on the inner peripheral surface of the body to stop water. The first seal and the second seal are configured to include a first seal and a second seal that is intimately attached to the outer peripheral surface of the tunnel structure by supplying a fluid to the first seal, and the second seal member is a ring. Since it is fixed to the inner peripheral surface of the body as a shape and it is possible to close the outer surface of the tunnel structure and stop water by supplying fluid inside and expanding it,
In the first seal member, the first seal is in sliding contact with the inner peripheral surface of the body, the second seal is expanded and closely adheres to the outer peripheral surface of the tunnel structure to stop water, and the second seal is contracted during movement to cause tunneling. Since it is separated from the outer peripheral surface of the structure, water can be reliably stopped and damage can be prevented.

According to the tunnel backfilling device of the third aspect of the present invention, the second seal is an endless rubber tube along the circumferential direction of the body, and the fluid is supplied into the second seal to expand the tunnel structure. Since it is possible to stop the water by making surface contact with the outer peripheral surface of the second seal, the second seal comes into close contact with the rough outer surface of the existing tunnel without a gap, and the water can be surely stopped.

Further, according to the tunnel backfilling method of the present invention, the body is fitted to the outer peripheral end of the tunnel structure buried in the ground, and the inner peripheral surface of the body and the tunnel structure are first fitted. The outer periphery of the tunnel structure is excavated by advancing the body and rotating the cutter while expanding and contracting one of the pair of front and rear seal members arranged between the outer peripheral surface and the outer peripheral surface of the tunnel structure. However, at this time, the outer peripheral surface of one of the sealing members is in sliding contact with the inner peripheral surface of the fuselage, the inner peripheral surface is in close contact with the outer peripheral surface of the tunnel structure to stop water, and after that, when the cutter excavates a predetermined distance, Then, one seal member is advanced while one seal member is contracted and the other seal member is expanded. At this time, the other seal member is moved to the inner peripheral surface of the body and the outer periphery of the tunnel structure. Water is stopped by closely contacting the surface, and during this movement Since as backfill fuselage rear with dismantling Luo tunnel structure, a tunnel backfilling reliably prevented water from entering the working time in the body, it is possible to improve the sealability.

[Brief description of drawings]

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

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

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front cross-sectional view of a tunnel backfill device representing a front seal device.

FIG. 5 is a cross-sectional view of a seal member that constitutes the front seal device.

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

FIG. 7 is a rear cross-sectional view of a tunnel backfill device showing a backflow prevention device.

FIG. 8 is a cross-sectional view of an essential part showing a front sealing device in a tunnel backfilling device according to a second embodiment of the present invention.

[Explanation of symbols]

11 torso 12 front body 13 Middle body 14 Rear body 17 Cutter head (revolving body) 23 Drive motor 31 center fold jack 35 propulsion jack 38 Backfill material supply device 40 guide beam 41 Reaction force receiving ring 51 Segment removal device (disassembly means) 61 Front seal device (seal means) 62 First Pressurizing Seal Member (One Sealing Means) 63 Second pressure type seal member (other sealing means) 64 Third pressure type seal member (other seal means) 66,67 sealing material 68 seal case (first seal) 70 Hollow seal (second seal) 72 seal slide jack (seal member moving means) 81 Rear sealing device 84,87 seal member 90 Grease supply path 101 Backflow prevention device 102 Hollow seal member 107 Hydraulic supply / discharge path T Existing tunnel (tunnel structure) S segment

Front page continued (72) Inventor Hiroshi Sagae 1-1 1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Kenji Murayama 2--15, Konan, Minato-ku, Tokyo No. 2 Obayashi Corporation Tokyo Head Office (72) Inventor Tomoyuki Fukuda 2-15-2 Konan, Minato-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) Reference JP-A-4-231600 (JP, A) JP-A-11-159278 (JP, A) JP-A-6-288176 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21F 15/00 E21D 9/06 301

Claims (4)

(57) [Claims] 1. A device for removing and backfilling a cylindrical tunnel structure buried in the ground, comprising: a cylindrical body having a diameter larger than that of the tunnel structure; and a front portion of the body. A revolving structure having a cutter rotatably supported and capable of excavating the outer periphery of the tunnel structure, a propulsion means for advancing the fuselage by obtaining a propulsion reaction force from the surrounding ground or the tunnel structure, and the fuselage Between the inner peripheral surface of the body and the outer peripheral surface of the tunnel structure, and
A first seal that can stop water by closely contacting the outer peripheral surface of the tunnel structure.
And a tunnel member disposed on the inner peripheral surface of the body.
Second seal member capable of adhering to the outer peripheral surface of the seal structure and stopping water
And a seal member moving means capable of moving the first seal member forward and backward, and a disassembling means for disassembling the tunnel structure from a working space in the body, the tunnel backfilling device. . 2. The tunnel backfilling device according to claim 1, wherein the first seal member has a ring shape and can be moved by the seal member moving means, and the first seal member slides on the inner peripheral surface of the body to stop water. And a second seal capable of stopping water by closely contacting the first seal with the outer peripheral surface of the tunnel structure by being supplied with a fluid and expanding . (2) The sealing member has a ring shape and is fixed to the inner peripheral surface of the body, and is supplied with a fluid to expand the sealing member so that the sealing member is in close contact with the outer peripheral surface of the tunnel structure to stop water. Characteristic tunnel backfilling device. 3. The tunnel backfilling device according to claim 2, wherein the second seal constituting the first seal member is an endless rubber tube along the circumferential direction of the body, and a fluid is supplied to the inside. A tunnel backfilling device capable of stopping water by surface contact with the outer peripheral surface of the tunnel structure by being expanded. 4. The front and rear, wherein the body is fitted to an outer peripheral end of a tunnel structure buried in the ground, and firstly, the body is fitted between an inner peripheral surface of the body and an outer peripheral surface of the tunnel structure. With one of the pair of sealing members expanded and the other contracted, the outer periphery of the tunnel structure is excavated by advancing the body and rotating the cutter. At this time, the one sealing member The outer peripheral surface of the sliding contact with the inner peripheral surface of the body, the inner peripheral surface is in close contact with the outer peripheral surface of the tunnel structure to stop water, and then, when the cutter excavates a predetermined distance, stop the body, , The one sealing member is advanced while the other sealing member is contracted and the other sealing member is expanded, and at this time, the other sealing member is the inner peripheral surface of the body and the outer periphery of the tunnel structure. Water is stopped by closely adhering to the surface, and during this operation, inside the body The tunnel backfilling method is characterized in that the tunnel structure is dismantled and the back of the body is backfilled.