JP2001234700A - Tunnel backfilling device, and tunnel backfilling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cutter or the like of a drilling machine from biting a working face for realizing smooth work. SOLUTION: This device is composed of a base seat ring 26 having a front side part 26a which can be axially applied to an end part 50a of a tunnel lining 50 axially movably provided inside an inner cylinder 20 and inserted into the inner cylinder 20, and a jack 25 which can be driven to axially press base seat ring 26 to the inner cylinder 20. In placing backfilling material, the base seat 26 is pressed to be axially applied to the end part 50a of the tunnel lining 50 through a seal member 27, so axial move of an outer shell 2 can be prevented to prevent a cutter 7a from biting the ground 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a tunnel backfilling device and a tunnel backfilling method capable of suitably backfilling an unnecessary tunnel.

[0002]

2. Description of the Related Art When an old tunnel that is no longer used is located at a place where a new tunnel is to be constructed, it is known to refill the old tunnel. In this construction, the surrounding area of the old tunnel was excavated in a ring using a shield device, etc., the excavated tunnel lining was dismantled and removed, and the space where the old tunnel was and the space excavated in the ring were backfilled. It is done in the procedure of backfilling with. The shield backfill device used in this construction and the construction method are described in, for example,
It is disclosed in, for example, Japanese Patent Publication No. 195700.

[0003]

By the way, in the above-mentioned backfilling apparatus, the outer shell is pushed forward by the pressure of the backfilling material which is cast rearward, and sometimes the cutter of the excavator cuts into the face. there were. If a cutter or the like cuts into the face, the excavation must be eliminated at the start of excavation before excavation is performed, which hinders smooth operation.

In view of the above circumstances, it is an object of the present invention to provide a tunnel backfilling device and a tunnel backfilling method for preventing a cutter or the like of an excavator from cutting into a face and realizing a smooth operation.

[0005]

According to the present invention for achieving the above object, the present invention provides an outer shell (2) and a ground (70) provided in the outer shell and surrounding a tunnel to be backfilled. An excavating means (7), an inner cylinder (20) provided in the outer shell, into which the tunnel lining (50) of the tunnel can be inserted, and a backfill material (60) behind the outer shell. And a backfill material placing means (15) capable of placing a tunnel inside the tunnel, wherein the tunnel is provided so as to be axially movable in the inner cylinder and inserted into the inner cylinder. The pressing member (2) having a contact portion (26a, 26b) formed so as to freely contact in the axial direction with the end portion (50a) of the lining.
6) and a pressing drive means (25) capable of driving the pressing member in the axial direction with respect to the inner cylinder.

According to a second aspect of the present invention, the contact portion is formed in an annular shape along the inner periphery of the inner cylinder.

A third aspect of the present invention is a seal member (2) which comes into contact with the contact portion in a sealing contact with an end of the tunnel lining.
7) is provided.

According to a fourth aspect of the present invention, in the tunnel backfilling method using the tunnel backfilling device, when the backfilling material driving means drives the backfill material behind the outer shell, the pressing drive means causes the pressure driving means to perform the operation. By pressing the pressing member in the axial direction against the end of the tunnel lining inserted into the inner cylinder, the outer shell is prevented from moving in the axial direction, and the excavating means is mounted on the ground. It is characterized in that biting is prevented.

According to a fifth aspect of the present invention, the tunnel backfilling device uses the structure of the third aspect, and when the excavating means excavates the ground, the pressing driving means presses the pressing member in the axial direction. The sealing member may be axially sealed in contact with an end of a tunnel lining inserted into the inner cylinder.

Note that the numbers in parentheses are for convenience of indicating corresponding elements in the drawings, and therefore, the present description is not limited to the descriptions on the drawings.

[0011]

According to the first and second aspects of the present invention, when the backfill material is cast, the pressing member is pressed against the end of the tunnel lining in the axial direction by the pressing drive means. The axial movement of the outer shell is prevented to prevent the excavation means from digging into the ground. Therefore, it is not necessary to perform the excavation after eliminating the biting of the excavating means as in the related art, and a smooth tunnel backfilling operation is realized.

According to the second aspect, the contact portion is formed annularly along the inner periphery of the inner cylinder, so that the pressing contact with the tunnel lining is performed all around. As a result, bias of the load and the like are prevented, and the outer shell can be stably supported.

According to the third and fifth aspects, at the time of excavation, the pressing member is pressed and driven in the axial direction by the pressing drive means so that the sealing member is pivoted with respect to the end of the tunnel lining inserted into the inner cylinder. Since the seal abuts in the direction, the seal between the inner cylinder and the tunnel lining is realized by this seal abutment. Since the seal abutment is pressed in the axial direction, the position of the seal abutment does not shift even if the tunnel lining moves relative to the inner cylinder in the axial direction. Therefore, the seal between the inner cylinder and the tunnel lining is favorably maintained by the seal contact between the seal member and the end of the tunnel lining.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view schematically showing an example of a tunnel backfilling device according to the present invention, and FIG. 5 is an enlarged side sectional view near an inner cylinder. The tunnel backfilling device 1 located in the ground 70 has an outer shell 2 as shown in FIG. 1, and the outer shell 2 is formed in a substantially cylindrical shape and has open front and rear ends. . In the present embodiment, the outer shell 2 includes a front shell 2a on the front side (left side in FIG. 1) and a rear shell 2b on the rear side (right side in FIG. 1).
The front shell 2a and the rear shell 2b are divided into a plurality of center bending jacks 3 (in FIG. (Only one is shown for the sake of illustration). That is, by driving each half-folding jack 3 and appropriately controlling the amount of protrusion of the ram, the posture of the rear shell 2b can be controlled so as to form an arbitrary angle with respect to the front shell 2a. In the present invention, it is not an essential condition that the outer shell 2 is a bent type, and the outer shell 2 may be formed as an integral cylindrical body that is not bent.

At the front end (the left end in FIG. 1) of the front shell 2a,
An excavator 7 including a plurality of cutters 7a and a drive device (not shown) for rotating and driving the cutters 7a coaxially with the outer shell 2 is arranged in an annular shape. Inside the excavator 7 arranged in an annular shape, that is, inside the front shell 2a, a cylindrical inner cylinder 20 formed to have a diameter smaller than that of the front shell 2a is provided through a suitable support member. It is inserted and supported coaxially with the shell 2a. A water stop device 30 is provided on the inner peripheral side of the inner cylinder 20. This water stop device 30 is a known device, and as shown in FIG. 5, a wire brush 31 provided annularly along the inner circumference of the inner cylinder 20 and a wire brush 31 provided annularly along the inner circumference of the inner cylinder 20. And an air tube 32. This wire brush 31
Has one end (left side in the figure) hinged to the inner cylinder 20, and the other end (right side in the figure) is rotatable. The air tube 32 is provided with appropriate air supply means 33 capable of supplying and releasing pressurized air AR.

As shown in FIG. 5, two water stopping devices 30 configured as described above are provided (note that FIGS. 1 to 4).
Only one is shown for simplicity of illustration). These water stop devices 30 are arranged side by side at appropriate intervals in the axial direction of the inner cylinder 20. Further, a known tube stopper provided on the outer peripheral side of the inner cylinder 20 is provided at a position on the front side at an appropriate distance in the axial direction of the inner cylinder 20 from the water stop device 30 on the front side (left side in the figure). It has a water device 40. The tube water stopping device 40 has an air tube 41 provided annularly along the inner circumference of the inner cylinder 20. The air tube 41 is provided with appropriate air supply means 42 that can supply and release pressurized air AR.

Behind the excavator 7 (right side in FIGS. 1 and 5), the wall member 6 is formed in an annular shape so as to basically close the outer periphery of the inner cylinder 20 and the inner periphery of the front shell 2a. Is provided. In addition, a mud pipe for pumping muddy water for drilling from outside the mine, etc.
Alternatively, a plurality of muddy water conveyance pipes 11 such as mud drainage pipes for conveying muddy water generated during excavation to the outside of the mine are penetrated through the inner cylinder 20 and are introduced into the front shell 2a. Tube 1
The distal end of the first excavator 7 is disposed near the excavator 7 through the wall member 6.

A plurality of hydraulic pressing jacks 25 are provided inside the front shell 2a of the outer shell 2. Each holding jack 25 has the ram 25a directed forward, and the front shell 2a
(Only one is shown in FIG. 1 to FIG. 4 because of the cross-sectional position), and the cylinder side is fixed to the front shell 2a via an appropriate support member. Have been. The ram 25 a of the holding jack 25 is located inside the inner cylinder 20. Further, a pedestal ring 26 concentric with the inner cylinder 20 is provided inside the inner cylinder 20.
The pedestal ring 26 slides on the inner circumference of the inner cylinder 20 to form a sealed state with respect to the inner peripheral surface of the inner cylinder 20. It can be moved in any direction. The pedestal ring 26 is joined to the tip (left side in the figure) of the ram 25a of the plurality of holding jacks 25. The front side 2 of the base ring 26
A sealing member 2 made of rubber or the like is provided on 6a (the left side in FIG. 5).
7 is provided annularly along the pedestal ring 26.
The pedestal ring 26 is disposed on the rear side (right side in the drawing) of the two water stop devices 30 described above.

On the other hand, as shown in FIG. 1, inside the rear shell 2b of the outer shell 2, a plurality of hydraulic jacks 9 with the ram 9a directed rearward extend along the inner periphery of the rear shell 2b. The cylinder side is fixed to the rear shell 2b via an appropriate support member in the form of an annular arrangement (only one is shown in FIG. 1 to FIG. 4 due to the cross-sectional position). Also, the back shell 2b
A partition wall 10 is provided at the rear side of the hydraulic jack 9 so as to block the interior of the rear shell 2b in the axial direction (the left-right direction in FIG. 1). It is provided movably. In addition, a plurality of known backfill material placing means 15 which is capable of feeding a predetermined backfill material 60 into the outer shell 2 from the outside of the pit or the like and which can be placed behind the partition 10 (right side in FIG. 1) is provided. I have.

A tunnel lining 50 excavated and exposed from the ground 70 is inserted into the inner cylinder 20. In the present embodiment, the tunnel lining 50 is formed by combining a plurality of segment rings 51 having a predetermined segment length W. The front side (left side in the figure) of this tunnel lining 50 passes through the inner cylinder 20 and the outer shell 2 and the unexcavated ground 7
It extends within 0.

Since the tunnel backfilling device 1 and the tunnel lining 50 of the tunnel to be backfilled have the above-described configurations, in order to backfill an existing tunnel with the tunnel backfilling device 1, first, a vertical shaft or the like must be used. Tunnel lining 5
The ground 70 outside of the excavator 0 is excavated by hand excavation or mechanical excavation, and the tunnel backfilling device 1 is installed so that the end of the tunnel lining 50 is close to the front end of the excavator 7.

When the tunnel backfill apparatus 1 is installed in a tunnel, the tunnel is backfilled as follows. That is, from the state of FIG.
Is driven in the direction of arrow A in FIG.
Drive backward. The partition wall 10 pushes a reaction force member (not shown) installed in a shaft or the like backward, and the reaction force drives the outer shell 2 to move in the direction of arrow B (forward) in FIG. In a state where the outer shell 2 is driven to move forward, the excavator 7 that is driven to move forward together with the outer shell 2 drives the cutter 7a, whereby the excavator 7 excavates the ground 70 in front.
With this excavation, the tunnel lining 50 buried in the ground 70 is dug out and exposed, and is sequentially inserted into the inner cylinder 20. In this excavation, the mud transport pipe 11
The muddy water is pumped to the excavator 7 side and is sprayed on a face in front of the excavator 7. The mud generated at the face is conveyed to the outside of the pit by the mud conveying pipe 11.

In the process from the state of FIG. 1 to the state of FIG. 2, the ram 25a is pulled back in the direction of arrow C (rearward) in FIG. Has been moved backwards within.
The seal member 27 provided on the pedestal ring 26 has a tunnel lining 50 inserted into the inner cylinder 20 as shown in FIG.
Is in contact with the end portion 50a. That is, the pedestal ring 26 is moved rearward by driving the plurality of holding jacks 25 in accordance with the movement of the tunnel lining 50 being inserted into the inner cylinder 20 by the movement of the outer shell 2 described above. . However, the driving of the holding jack 25 is controlled such that the contact pressure between the seal member 27 of the pedestal ring 26 and the end portion 50a of the tunnel lining 50 maintains a predetermined value, and the seal comes into contact. .

The pressurized air AR is removed by the air supply means in the two water stopping devices 30, and the pressurized air AR is also removed by the air supply means 42 in the tube water stopping device 40. For this reason, in each water stop device 30, the wire brush 3
1 and the tunnel lining 50 are not pressed, and the air tube 41 and the tunnel lining 5
No pressure between zero is made. That is, the inner cylinder 20 and the tunnel lining 5 by the water stopping device 30 and the tube water stopping device 40 are used.
The seal with 0 has been released. This release of the seal solves the problem that the wire brush 31, the air tube 41, and the like are broken by strong friction with the tunnel lining 50 that is moving with respect thereto. On the other hand, the sealing member 27 of the pedestal ring 26 and the end 50 of the tunnel lining 50
a is in contact with a predetermined contact pressure and forms a sealed state between them (because the sealed state is also formed between the base ring 26 and the inner cylinder 20 as described above). The space between the inner cylinder 20 and the tunnel lining 50 is well sealed.

That is, the muddy water generated at the face in the above excavation is supplied from the vicinity of the front end of the outer shell 2 to the tunnel lining 50 and the inner cylinder 2.
Enter between 0. However, the pedestal ring 26 and the inner cylinder 20
And between the sealing member 27 of the pedestal ring 26 and the tunnel lining 50 are both sealed.
The mud does not enter the work space behind the pedestal ring 26 or the like, that is, inside the outer shell 2. Further, since the seal member 27 is pressed against the tunnel lining 50 in the axial direction, no deviation or the like occurs at these contact portions. Accordingly, the reliability of the sealing state is high, and the seal member 27 is less likely to be damaged and has excellent durability.

When the hydraulic jack 9 completes the drive for one stroke and reaches the state shown in FIG. 2, the ram 25a of the holding jack 25 is almost fully retracted, and the inner cylinder 20 is dug accordingly. The tunnel lining 50 thus inserted was inserted up to the position of the retracted ram 25a. In the present embodiment, the stroke of the holding jack 25 is equal to (or larger than) one segment length W of the segment ring 51, and thus the base ring 26 is moved to the state shown in FIG. (Greater than this).

In this state, the two water stopping devices 30 supply the pressurized air AR to the air tube 32 by the air supply means, and the tube water stopping device 40 supplies the pressurized air AR to the air tube 41 by the air supply means 42. Supply. Thereby, as shown in FIGS. 2 and 6, in each of the water stopping devices 30, the rear end side of the wire brush 31 is pressed by the tunnel lining 50 by the air tube 32, and between the wire brush 31 and the tunnel lining 50. A sealed state is formed. Also,
In the tube water stopping device 40 as well, the air tube 41 is pressed by the tunnel lining 50 to form a sealed state. In addition,
In the state of FIG. 2, the tunnel lining 50 is stopped with respect to the inner cylinder 20, so that the wire brush 31 or the air tube 41
No sliding occurs between the tunnel lining and the tunnel lining 50, and the reliability of the sealed state can be ensured. Further, the wire brush 31 and the air tube 41 are not damaged by strong friction.

In this way, the seal between the inner cylinder 20 and the tunnel lining 50 is formed by the water stopping devices 30, 30 and the tube water stopping device 40, and the pressing of the ram 25a of the pressing jack 25 is released. The seal of the pedestal ring 26 by the seal member 27 is released. Thereafter, the tunnel lining 50 inserted into the inner cylinder 20 is disassembled by one segment length W as shown in FIG. Dismantled tunnel lining 50
Will be transported out of the mine appropriately using the existing tunnel. When the disassembly of the tunnel lining 50 for one segment length W is completed, the ram 25a of the holding jack 25 is protruded in the direction of arrow D in FIG. 3 as shown in FIG. 3, and as shown in FIG. The end portion 50a of the tunnel lining 50 is pressed by a predetermined contact pressure by the seal member 27.

Next, as shown in the state of FIG. 3 from the state of FIG.
Is installed behind the partition wall 10. At the same time as the driving, the hydraulic jack 9 is reversely driven in the direction of arrow E in FIG. 4 to return the partition 10 to the front. By returning the partition 10 to the state shown in FIG. 4, the space corresponding to the return of the partition 10 is filled with the backfill material 60. At this time, the outer shell 2 receives a large forward force by the pressure of the backfill material 60 cast behind the partition 10. However, the pedestal ring 26 is pressed forward by the plurality of pressing jacks 25 described above, and the front side portion 26a of the pedestal ring 26 is sandwiched (with the seal member 27 interposed).
The end 50a of the tunnel lining 50 is pressed and abutted, and can receive an axial reaction force from the tunnel lining 50. Is supported by the tunnel lining 50 via the holding jack 25 and the pedestal ring 26, thereby preventing the outer shell 2 from accidentally moving forward. Thereby, the inconvenience that the cutter 7a of the excavator 7 cuts into the front face can be avoided.

As shown by the broken line in FIG. 6, a projection 26b projecting forward is formed at the front end 26a of the pedestal ring 26, and the tunnel lining 50 is connected via the pedestal ring 26 as described above. When receiving a reaction force in the axial direction, the protrusion 26b may mainly receive a load. This can prevent the disadvantage that the seal member 27 is damaged by a large load.

Thus, as shown in FIG.
Completes the return drive for one stroke, completes the placement of the backfill material 60 inside the rear end side of the rear shell 2b, and fixes the placed backfill material 60 until a predetermined strength is developed. Tie. Thereafter, the above-described procedure is repeated to advance backfilling of the tunnel. That is, the back-filled material 60
Then, the hydraulic jack 9 is driven to drive the partition wall 10 backward (FIG. 1). However, the partition wall 10 pushes the solidified backfill material 60 rearward, and the outer shell 2 is driven to move forward by the reaction force. The excavator 7 and the muddy water excavate the ground 70 in front thereof together with the movement driving of the outer shell 2. In the movement of the outer shell 2 and the excavation process, the seal between the inner cylinder 20 and the tunnel lining 50 is performed by the seal member 27 of the pedestal ring 26 as described above.

When the hydraulic jack 9 completes driving for one stroke, the holding jack 25 is pulled back and the inner cylinder 20 is moved.
The inner tunnel lining 50 is dismantled by one segment length W (FIGS. 2 and 3). In this step, as described above, the seal between the inner cylinder 20 and the tunnel lining 50 is removed by the water stopping device 3.
0, 30 and the tube water stop device 40. Thereafter, the pedestal ring 26 is brought into contact with the tunnel lining 26 by the holding jack 25. Then, as shown in FIGS. 3 and 4, the partition 10 is returned to the front, and a backfill material 60 is cast behind the partition 10. As described above, in this step, the forward movement of the outer shell 2 is prevented by obtaining a reaction force against the tunnel lining 50 via the holding jack 25 and the pedestal ring 26. Then, the hydraulic jack 9 completes the one-stroke return drive, completes the placement of the backfill material 60, and solidifies the placed backfill material 60 until a predetermined strength is developed.

Thereafter, as described above, the backfill material 60 solidified by the partition walls 10 is pressed backward, and the outer shell 2 is moved forward by the reaction force thereof, while the excavator 7 and the muddy water move the outer ground 2 forward. The procedure of excavating 70, dismantling the tunnel lining 50 inserted in the inner cylinder 20, returning the bulkhead 10 forward, and placing the backfill material 60 behind it,
The procedure of solidifying zeros is sequentially repeated to complete the tunnel backfill.

As described above, in the present embodiment, the sealing member 27 is attached to the end 5 of the tunnel lining 50 inserted into the inner cylinder 20.
0a, the inner cylinder 20
The seal between the tunnel lining 50 and the tunnel lining 50 is realized by the seal contact between the above-described sealing member 27 and the end 50 a of the tunnel lining 50. Since the seal abutment is pressed in the axial direction, the position of the seal abutment does not shift even if the tunnel lining 50 moves relative to the inner cylinder 20 in the axial direction. Therefore, the inner cylinder 2 is brought into contact with the seal member 27 and the end portion 50 a of the tunnel lining 50.
The seal between 0 and the tunnel lining 50 is well maintained.

When the backfill material 60 is cast, the tunnel lining 5 is held by the holding jack 25 via the pedestal ring 26.
0 in the axial direction, the tunnel lining 50 of the outer shell 2 is formed via the seal member 27 or the projection 26b.
Of the cutter 7a, the nozzle of the water jet, and the like are prevented from cutting into the face of the ground. That is, since it is not necessary to perform the work of eliminating the biting of the excavating means into the face as in the related art, the smoothness in the tunnel backfilling work is greatly improved.

The pedestal ring 26 and the sealing member 27
And a holding jack 25 for holding them against the tunnel lining 50 serves both as a means for sealing and a means for supporting the outer shell 2, but with a means having a sealing function,
A means having a support function may be provided separately.

In the above-described embodiment, the excavator 7 is exemplified as the excavating means. However, a water jet or the like without using a cutter may be employed as the excavating means.

[Brief description of the drawings]

FIG. 1 is a side sectional view schematically showing an example of a tunnel backfill apparatus according to the present invention.

FIG. 2 is a schematic view showing the next step of FIG. 1 in tunnel backfill.

FIG. 3 is a schematic view showing the next step of FIG. 2 in tunnel backfilling.

FIG. 4 is a schematic view showing the next step of FIG. 3 in tunnel backfilling.

FIG. 5 is an enlarged side sectional view near the inner cylinder, corresponding to the state of FIG. 1;

FIG. 6 is an enlarged side sectional view near the inner cylinder, corresponding to the state in FIG. 2;

FIG. 7 is an enlarged sectional side view near the inner cylinder, and FIGS.
The figure corresponding to the state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel backfilling device 2 Outer shell 7 Excavation means (excavator) 15 Backfill material setting means 20 Inner cylinder 25 Press drive means (press jack) 26 Press member (pedestal ring) 26a Contact part (front side) 26b Contact part (projection part) 27 Seal member 50 Tunnel lining 50a End part 60 Backfill material 70 Ground

Continued on the front page (72) Inventor Kikuo Ishida 1-9-4 Nihonbashi Honcho, Chuo-ku, Tokyo Mitsui Construction Co., Ltd. Tokyo Civil Engineering Branch F-term (reference) 2D054 AA05 AD20 BA05 BA25 BA28 CA03 DA12

Claims (5)

[Claims] 1. An outer shell, excavating means provided on the outer shell and capable of excavating ground around a tunnel to be backfilled, and a tunnel lining of the tunnel provided inside the outer shell and inserted into the inside. An inner cylinder to be obtained, and a backfill material placing means capable of placing a backfill material behind the outer shell. A tunnel backfilling device, comprising: A pressing member formed with an abutting portion that is capable of abutting in the axial direction with respect to an end of the tunnel lining inserted into the inner cylinder; and a driving member that is capable of axially driving the pressing member axially with respect to the inner cylinder. And a pressure driving means. 2. The tunnel backfilling device according to claim 1, wherein said contact portion is formed in an annular shape along an inner periphery of said inner cylinder. 3. The tunnel backfilling device according to claim 2, wherein a seal member is provided at the contact portion so as to seal against an end of the tunnel lining. 4. A tunnel backfilling method using the tunnel backfilling device according to claim 1, wherein the backfilling device driving means drives the backfill material behind the outer shell. At the time of installation, by pressing the pressing member in the axial direction against the end of the tunnel lining inserted into the inner cylinder by the pressing drive means, it is possible to prevent the outer shell from moving in the axial direction. And preventing the excavating means from digging into the ground. 5. The tunnel backfilling device according to claim 3, wherein, when the ground is excavated by the excavating unit, the pressing member is pressed and driven in the axial direction by the pressing driving unit, and the sealing member is pressed. 5. The tunnel backfill method according to claim 4, wherein the end of the tunnel lining inserted into the inner cylinder is brought into axial contact with a seal.