JP2001115798A - Triple cylinder type tunnel back-filling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate intake of an excavated backing material and excavated earth, and to downsize the cross section of an excavated area to reduce the amount of a back-filling material. SOLUTION: The triple cylinder type tunnel back-filling apparatus carries out back-filling of a tunnel E while removing an existing tunnel structure A. The apparatus includes a front trunk 2 of a triple cylinder type, which consists of an external cylinder 11 having a diameter larger than the diameter of the existing tunnel structure A, for preventing cave-in of the natural ground B, an intermediate cylinder 12 equipped with a cutter head 7 at the front end thereof, and an internal cylinder 13 shielding the interior and exterior of the apparatus. Further, a slurry chamber 26 is formed by using a gap defined by the intermediate and internal cylinders 12, 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triple-cylinder tunnel backfilling device that applies a shield method and refills a tunnel while removing an existing tunnel structure.

[0002]

2. Description of the Related Art Conventionally, underground development has not been so advanced, so that when a new tunnel is constructed, another existing tunnel has hardly been an obstacle.

[0003] However, as the underground development progresses, there may be old tunnels that are no longer used in areas where new tunnels are to be constructed. In the area where such unnecessary tunnels exist, when constructing a new tunnel using a shield machine, etc., when the newly constructed tunnel intersects with the unnecessary old tunnel, prior to the construction of the new tunnel, It is necessary to backfill old and unnecessary tunnels.

[0004] By the way, old unnecessary tunnels, for example,
When removing the tunnel for sewage, after removing the secondary lining forming the inner surface of the tunnel, the backing material filled between the primary lining and the ground is transferred to the tip of the outer cylinder. Excavation is performed one pitch at a time with the cutter provided in the yard, and the segments from which the backing material has been removed are sequentially dismantled and removed, while sediment is buried in the tunnel (cavity) after the segments are removed. .

[0005] However, a double-tube backfilling device in which an outer cylinder plays a role of driving a cutter and an inner cylinder shields the inside and outside of the machine has been conventionally proposed. There is no intake to take in the excavated backing material. Further, as shown in FIG. 10, a quadruple-tube type tunnel backfilling device 100 in which a double cylindrical sending / discharging pipe 103 is provided between an outer cylinder 101 and an inner cylinder 102 has been proposed. The adoption of the double cylindrical feed / discharge pipe 103 increases the excavation cross section, which is uneconomical due to the large amount of backfill material.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to easily take in a backing material and earth and sand excavated by a cutter. It is an object of the present invention to provide a triple tube tunnel backfilling device in which an excavated cross section is made as small as possible and backfill material is made as small as possible.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a triple-tube tunnel backfilling device according to the present invention is a device for backfilling a tunnel while removing an existing tunnel structure. The front cylinder is formed by an outer cylinder that is larger in diameter than the tunnel structure and prevents the collapse of the ground, a middle cylinder with a cutter head at the tip, and an inner cylinder that shields the inside and outside of the machine. The muddy water chamber is formed by utilizing the gap between the inner cylinders.

As described above, the front body is formed by the triple cylinder of the outer cylinder, the middle cylinder, and the inner cylinder, and the muddy water chamber is formed by utilizing the gap between the middle cylinder and the inner cylinder. The outer diameter of the tunnel backfilling device can be made smaller than that of the tunnel backfilling device.

Therefore, since the cross section of the excavation by the tunnel backfilling device becomes smaller than before, the amount of backfilling material is reduced correspondingly, which is economical.

Further, the present invention provides a plurality of water stoppage devices for closing a gap between an existing tunnel structure and an inner surface of the inner cylinder, the inner surface of the inner cylinder being provided with a plurality of stages of water stopping devices. By providing a water stoppage device for closing the gap between the inner surfaces of the cylinder in the inner cylinder, it is possible to prevent intrusion of earth and sand and groundwater.

Further, according to the present invention, the cutter head at the tip of the middle cylinder is provided with an extra-digging device having a high-pressure water discharge port, so that the backing material is formed by a synergistic effect of the extra-digging device and the high-pressure water discharged from the discharge port. It can be removed efficiently.

Further, according to the present invention, it is possible to maintain a constant clearance between the inner surface of the inner cylinder and the outer peripheral surface of the segment by installing a clearance measuring device on the inner surface of the inner cylinder. It will be easier.

[0013]

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

As shown in FIG. 1, a tunnel backfill device 1
Is formed of a front trunk 2 having an inner diameter slightly larger than the outer diameter of the existing tunnel structure A, and a rear trunk 3 slidably fitted to the rear part of the front trunk 2. The back and forth movement of the rear trunk 3 is performed by a hydraulic cylinder 4 provided on the front trunk 2.
The rear trunk 3 is formed of a cylinder 5 and a partition 6, and the rear end of the cylinder 5 is sealed by the partition 6.

The front part of the front body 2 is a triple cylinder composed of an outer cylinder 11, a middle cylinder 12, and an inner cylinder 13. The outer cylinder 11 prevents collapse of the ground (not shown). I have. The middle cylinder 12 is rotatably provided inside the outer cylinder 11, and has a cutter head 7 at an end thereof. As shown in FIG. 3, the cutter head 7 is formed in an annular shape, and is provided with a roller cutter 8, a main bit group 9, and the like.

A pair of main bit groups 9 are provided at predetermined intervals between the adjacent roller cutters 8, 8, and an outer margin is provided between the main bit groups 9, 9 located on the upper side in the figure. A digging device 10 is provided, and an inner surplus digging device 14 is provided between the main bit groups 9, 9 located on the lower side.

These over-digging devices 10 and 14 are capable of adjusting the amount of over-digging by adjusting the projection length of the copy cutter 15. In addition, the inner surplus device 14
As shown in FIG. 4, the copy cutter 15 is provided with a jet water discharge port 16a for jetting high-pressure water toward the outer peripheral surface of the existing segment C.

As shown in FIG. 2, the cutter head 7 has a jet water discharge port 16b for jetting high-pressure water toward the outer peripheral surface of the existing segment C, and the inner cylinder 13 has a similar jet inside. A water discharge port 16c is provided.

As shown in FIG. 1, the middle cylinder 12 is supported by a hollow annular support member 18. A pinion 20 meshes with an annular internal gear 19 attached to the rear end surface of the support member 18. When the pinion 20 rotates, the inner cylinder 12 rotates together with the internal gear 19. ing. The pinion 20 is provided on a rotating shaft of a cutter drive motor 22 attached to a partition 21 that partitions the inside of the outer cylinder 11.

As shown in FIG. 1, a hollow fixed tube 23 arranged at the center of the outer cylinder 11 is fixed to the partition 21. As shown in FIG. 2, the inner tube 13 located inside the middle tube 12 is supported by two front and rear support plates 24 and 25 attached to the fixed tube 23. And
A muddy water chamber 26 is formed using a gap between the middle cylinder 12 and the inner cylinder 13.

As shown in FIG. 1, a mud feeding pipe 28 and a mud discharging pipe 29 are passed through a connecting pipe 27 for excavation connected to the front end of the fixed pipe 23. The mud feeding pipe 28 is fixed to the ceiling of the inner cylinder 13 and communicates with the mud chamber 26. The mud drain pipe 29 is fixed to the bottom of the inner cylinder 13 and communicates with the mud chamber 26.

As shown in FIG. 3, the muddy water chamber 26 communicates with an opening 30 which is open at a position where the above-mentioned main bit group 9 is provided. In addition, the excavation connecting pipe 27
A transfer pipe 31 for transferring backfill earth and sand is passed through the fixed pipe 23, and the tip thereof is attached to the partition wall 6 of the rear trunk 3.

As shown in FIG. 2, three water stop devices are provided inside the inner cylinder 13. More specifically, the first and second water stop devices 32 are provided inside the inner cylinder 13 in two stages, front and rear. Each water stopping device 32 fixes the annular front edge of the annular rubber packing 33 containing spring steel to the inside of the inner cylinder 13 so that the annular free edge contacts the outer peripheral surface of the existing segment C. Has become. A flexible annular pressing film 34 is provided inside the rubber packing 33 containing spring steel, and air or water is always pressurized and injected through a thin tube 36 into an annular chamber 35 partitioned by the pressing film 34. And
The free edge of the annular rubber packing 33 containing spring steel is pressed against the outer peripheral surface of the existing segment C.

On the other hand, the third water stop device 37 is installed so as to face the end face of the segment C. The third water stopping device 37 has a water stopping pad 39 on the front surface of an arc-shaped spreader 38 and a radial sliding seal 41 on a rib 40 fixed to the back surface of the spreader 38. The spreader 38 is attached to a rod portion of a hydraulic cylinder 42 attached to the support board 24 described above. As shown in FIG. 5, the adjacent spreaders 38 are connected by a circumferential waterproof seal 43. The circumferential waterproof seal 43 is attached to the back of the spreader 38.

As shown in FIG. 1, a gripper device 45 is slidably fitted to a digging connection pipe 27 connected to the front end of the solid pipe 23. The gripper device 45 is connected to a rod portion of a shield jack / reverse jack (hereinafter, referred to as a jack) 46 installed on the connection pipe 27 located in front of the gripper device 45.

As shown in FIG. 6, the gripper device 45
Are provided radially from the connecting pipe sliding holder 47.
It has a book arm 48. Also, as shown in FIG.
A grip shoe 50 is attached to a free end of each arm 48 via a universal joint 49 for adjusting a grip shoe angle. At the base of each arm 48, a spherical bearing 51 for adjusting the direction of the backfilling device is provided. Each arm 48 has a pair of front and rear gripper jacks 5.
2, 53 are provided. Also, the grip shoe 50
, A pair of front and rear reaction force receiving claws 54 are provided.

As shown in FIG. 2, a magnetic clearance measuring device 44 is installed inside the inner cylinder 13 to measure the clearance between the inner cylinder 13 and the segment C. This magnetic clearance measuring device 44 is
Are provided at equal intervals in the circumferential direction. And 4
By adjusting the length of the arm 48 of the book, the clearance between the inner cylinder 13 and the segment C is normally kept constant.

As shown in FIG. 1, a well-known erector 56 is disposed in front of the support board 24.

Next, the work of backfilling the existing tunnel structure will be described.

First, after the rod portion (not shown) of the jack 46 is contracted to draw the gripper device 45 to the tip of the connecting pipe 27, as shown in FIG. 8, the four arm portions 48 of the gripper device 45 are used. To fix the gripper device 45 to the existing segment C. At this time, the reaction force receiving claw 54 is positioned in front of the end plate C1 of the segment C. The secondary lining has been removed in advance.

Further, the rod portion (not shown) of the hydraulic cylinder 42 of the third water stopping device 37 is extended to spread the spreader 3.
8 is pressed against the rear end face of the existing segment C. Also,
While supplying muddy water a into the muddy water chamber 26 from the mud pipe 28,
The muddy water b in the muddy water chamber 26 is discharged from the muddy drain 29 to the outside of the machine.

After the preparation process as described above, the cutter drive motor 22 is driven to rotate the middle cylinder 12 and the cutter head 7, and at the same time, the cutter head 7 is provided in the discharge port 16b and the inner cylinder 13 provided in the cutter head 7. High-pressure water is injected from the discharge port 16c.

Thereafter, when the rod portion of the jack 46 is extended and the front trunk 2 of the tunnel backfilling device 1 is pulled toward the front of the existing segment C, the existing segment C
Is excavated by a roller cutter 8 provided on the cutter head 7, a main bit group (not shown), and the like. The finely crushed backing material and earth and sand enter the muddy water chamber 26 through the opening 30 of the cutter head 7, and are discharged out of the machine through the drainage pipe 29.

In the meantime, the rod portion of the hydraulic cylinder 42 of the third water stopping device 37 is synchronously contracted as the front barrel 2 advances. Further, the hydraulic cylinder 4 provided on the front trunk 2 is extended in synchronism to prevent collapse of the soil F buried in the tunnel E by the partition wall 6 of the rear trunk 3.

When the front body 2 advances by one segment, that is, by one pitch, the advance of the front body 2 is temporarily stopped.

Thereafter, as shown in FIG. 9, after the four arms 48 of the gripper device 45 are contracted,
Of the gripper device 45 by connecting the connecting pipe 2
7 to the tip. Then, after the existing segment C located at the rear end is dismantled using the erector 56, the segment C is transported to the ground using the existing tunnel structure A. Meanwhile, the soil (F) is back-filled in a tunnel (cavity) E formed behind the rear body 3 while contracting a rod portion (not shown) of the hydraulic cylinder 4 provided on the front body 2.

By repeating the above steps, the existing tunnel structure A is rebuilt while being dismantled.

[0038]

As described above, the present invention provides an outer cylinder, a middle cylinder,
The front body of the tunnel backfilling device is formed by the triple inner cylinder, and the muddy water chamber is formed by using the gap between the middle cylinder and the inner cylinder. It has become possible to reduce the outer diameter of the device.

Therefore, the excavated cross section by the tunnel backfilling device is smaller than before, and accordingly, the backfilling material is reduced, which is more economical than before.

In addition, the present invention provides a plurality of water stopping devices for closing a gap between the existing tunnel structure and the inner surface of the inner cylinder, the inner surface of the inner cylinder being provided with a plurality of stages of water stopping devices. Since the water stop device that closes the gap between the inner surfaces of the cylinder is provided in the inner cylinder, it is possible to prevent intrusion of earth and sand and groundwater.

Further, according to the present invention, since the cutter head at the end of the middle cylinder is provided with an extra-digging device having a high-pressure water discharge port, the backing material is formed by the synergistic effect of the extra-digging device and the high-pressure water discharged from the discharge port. It became possible to remove efficiently.

Further, in the present invention, since the clearance measuring device is installed on the inner surface of the inner cylinder, the clearance between the inner surface of the inner cylinder and the outer peripheral surface of the segment can be kept constant.
Attitude control has become easier.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of the tunnel backfilling device according to the present invention.

FIG. 3 is a front view including a partial cross section of the cutter head.

FIG. 4 is an enlarged view of the inner surplus device.

FIG. 5 is a rear view of the third water stop device.

FIG. 6 is a front view of the gripper device.

FIG. 7 is a longitudinal sectional view of the gripper device.

FIG. 8 is an explanatory diagram of a backing material excavation operation.

FIG. 9 is an explanatory diagram of a segment disassembly operation.

FIG. 10 is an explanatory view of a conventional tunnel backfilling device.

[Explanation of symbols]

 A Existing tunnel structure E Tunnel B Ground 1 Tunnel backfilling device 2 Front trunk 7 Cutter head 11 Outer cylinder 12 Middle cylinder 13 Inner cylinder 26 Mud chamber

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kohei Takamoto 3-1-1, Tamano, Tamano-shi, Okayama Prefecture Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Works (72) Inventor Toshiro Ishinomaki 3-1-1, Tamano, Tamano-shi, Okayama Prefecture No. 1 Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Plant (72) Inventor Toshiyuki Muramoto 4-12-20 Nihonbashi Honcho, Chuo-ku, Tokyo Sato Industry Co., Ltd. F-term (reference) 2D054 AA10 AC05 AD07 BA01 GA10 GA65

Claims (4)

[Claims] 1. An apparatus for backfilling a tunnel while removing an existing tunnel structure, the outer cylinder having a diameter larger than that of the existing tunnel structure to prevent collapse of the ground, and a cutter head at a tip end. A triple cylinder tunnel backfilling device characterized in that the front body is formed by a triple cylinder of a middle cylinder and an inner cylinder that shields the inside and outside of the machine, and a muddy water chamber is formed by utilizing a gap between the middle cylinder and the inner cylinder. . 2. A plurality of water stopping devices for closing a gap between an existing tunnel structure and an inner surface of the inner cylinder are disposed on the inner surface of the inner cylinder, and a water stop device between the rear end surface of the existing tunnel structure and the inner surface of the inner cylinder is provided. The triple cylinder tunnel backfill device according to claim 1, wherein a water stop device for closing the gap is provided in the inner cylinder. 3. The triple-cylinder tunnel backfilling device according to claim 1 or 2, wherein an excavation device having a high-pressure water discharge port is provided at the cutter head at the tip of the middle cylinder. 4. The triple cylinder tunnel backfill apparatus according to claim 1, wherein a clearance measuring device is provided on the inner surface of the inner cylinder.