JP2599073B2 - Peripheral ring lining device for the planned tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for constructing a ring-shaped lining around a planned tunnel when constructing a large-diameter tunnel.

[0002]

2. Description of the Related Art In recent years, there has been an increasing tendency to build buildings deep underground as available land decreases, and in order to satisfy this demand, excavators suitable for building large-diameter tunnels have been developed. ing. As such an excavator, for example, a ring-cut type excavator that excavates a ring-shaped lining along the outer periphery of a planned tunnel as described in Japanese Patent Application Laid-Open No. 24484/1990 is known. .

[0003] The structure of this excavator is formed by an inner / outer double frame having substantially the same cross-sectional shape as the lining on which the excavator body is to be constructed. Boom cutters, rotary cutters, multi-axis cutters, etc. are arranged respectively, and these cutters excavate the face ground in front of the excavator body and are already driven and formed by the operation of jacks arranged in the body. The main body is propelled while supporting the reaction force on the front end face of the lining, and the excavated earth and sand taken into each divided frame is discharged backward.

[0004]

According to the excavator having the above-described structure, the structure becomes extremely complicated because several types of cutters and means for individually driving and controlling each cutter are required.
Not only does the failure rate increase, but the cutter shaft is also swung back and forth, left and right, and the cutting face is excavated with the excavation bit at the tip. Excavation efficiency is poor due to dripping or unexcavated portions, and the drive control operation is complicated.

Further, the means for discharging excavated earth and sand taken into each divided frame is complicated, and it is necessary to form a space for piping and a passage for discharging earth and sand in the rear side of the body of the excavator in accordance with the excavation of the main body. However, in order to obtain such a space or a passage, a part of the divided frame must be enlarged and excavated excessively, and there has been a problem that the workability of the tunnel lining is reduced. An object of the present invention is to provide an outer ring-shaped lining device for a planned tunnel that can solve such a problem.

[0006]

In order to achieve the above object, an outer ring-shaped lining device for a planned tunnel according to the present invention comprises a ring-shaped rotary cutter provided at a front end opening of a shield main body comprising a cylindrical inner and outer double frame. A head is disposed and a press ring is disposed in the rear end so as to be movable back and forth so as to consolidate the lining concrete to be poured into the ring-shaped drilled hole drilled by the ring-shaped rotary cutter head. Further, a small-diameter shield body is integrally provided at an appropriate position on the inner peripheral portion of the inner cylindrical frame of the shield body, and a small-diameter circular cutter is disposed at a front end opening of the small-diameter shield body, and excavation is performed by rotation of the circular cutter. The hole to be formed is configured to be a pipe passage such as a concrete transportation pipe or a sediment discharge passage.

[0007]

When the shield main body is propelled while rotating the ring-shaped cutter head, a ring-shaped space is formed behind the main body. After this space is filled with concrete and cast, the press ring is extended and pressed against the cast concrete surface. The shield body is propelled by applying a reaction force to the press ring that presses the lining.

On the other hand, when the small-diameter circular cutter disposed at the front end opening of the small-diameter shield body integrally provided at an appropriate position on the inner circumference of the inner cylindrical frame of the shield main body is rotated, the propulsion of the shield main body by the press ring causes the following. A small-diameter tunnel is excavated simultaneously with the formation of the ring-shaped space, and segments and the like are continuously assembled on the inner peripheral surface of the small-diameter tunnel. It allows the entry and exit of members, concrete transportation piping, and sediment discharge.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
In FIG. 1, the shield main body 1 has inner and outer double cylindrical frames 1a and 1b.
For example, the diameter of the inner cylinder frame 1b is 15m, and the outer cylinder frame
The diameter of 1a is 20m. This shield body 1
A ring-shaped partition wall 2 is disposed in the front portion of the main body 1 and the inner and outer peripheral surfaces of the partition wall 2 are fixed to and integrated with the opposing inner surfaces of the inner and outer cylindrical frames 1a and 1b. The inside of the rear part is partitioned and formed in an equipment room 4.

Reference numeral 5 denotes a ring-shaped cutter head rotatably disposed on the front end opening side of the shield main body 1, as shown in FIG.
A cutter bit 6 is provided on the front surface at regular intervals in the circumferential direction, and a slit 7 serving as a sediment intake port is formed along the cutter bit 6 between the front and rear surfaces. It is penetrating.

Reference numeral 8 denotes a drive motor for the ring-shaped cutter head 5, which is mounted on the rear surface of the partition wall 2, and whose rotating shaft is made to penetrate the partition wall 2 and protrude toward the front side. Is engaged with an internal gear 11 fixed to a rotating frame 10 rotatably supported by a bearing 2a provided on the front surface of the partition wall, and the front surface of the rotating frame 10 and the rear surface of the cutter head 5 are supported by a support arm 12 Drive motor 5
To rotate the cutter head 5.

Reference numeral 13 denotes a press ring disposed in the rear end portion of the shield body 1 so as to be movable back and forth, and a plurality of propulsion jacks 14 disposed at appropriate intervals in the circumferential direction in the equipment room 4.
The front end is connected to and supported by the inner surface of the shield body 1 and the rear end is connected to the front surface of the press ring 13 to be moved back and forth by the operation of the propulsion jacks 14.

Reference numeral 15 denotes a moving frame made of an inner / outer double cylindrical member whose length is appropriately protruded rearward from the rear end of the shield main body 1. The moving frame 15 is provided in the front ring-shaped space of the moving frame 15. A press ring 13 is provided, and the press ring 13
Wheels 16 and seal members 17 disposed at the front and rear portions of the inner and outer peripheral surfaces of the moving frame 15 are slidably slidably in contact with the inner surface of the moving frame 15. Further, a tail seal 18 provided on the inner surface of the rear end of the shield body 1 is slidably contacted with the outer surface of the moving frame 15.

Reference numeral 19 denotes a pulling jack of the moving frame 15, which is disposed at a plurality of inner surfaces of the shield main body 1 in the equipment room 4 and has a front end pivotally attached to and supported by the inner surface of the equipment room 4 and a rear end. The moving frame 15 is configured to be integrally connected to the front end face of the moving frame 15 and to be moved back and forth by the operation of the pulling jack 19.

Reference numeral 20 denotes a small-diameter circular cutter which is disposed below the opening end of the shield main body 1 so that a part of the outer periphery of the rear surface of the ring-shaped cutter head 5 overlaps a part of the inner peripheral side of the ring-shaped cutter head 5. The cylindrical small-diameter shield body 21 is rotatably provided at the front end opening. As shown in FIG. 1, the small-diameter shield body 21 is formed to be slightly longer than the length of the shield main body 1, and a portion where the shield main body 1 and the inner cylinder frame 1b intersect is formed by a ring-shaped cutter head 5 The small-diameter shield body 21 and the shield main body except for the front end 1b 'of the inner cylindrical frame 1b serving as a storage portion and the rear end 21' of the small-diameter shield body 21 in which the press ring 13 is slidably disposed. 1 inner cylinder frame 1b
Are formed in a structure in which the lower peripheral portion is removed.

Therefore, the rear side of the lower peripheral portion of the ring-shaped cutter head 5 communicates with the inside of the small-diameter shield body 21 and
The inner peripheral portion at the lower end of the press ring 13 is formed in a shape lacking a portion corresponding to the shape of the lower peripheral portion of the small-diameter shield body 21, and has a structure in which it is in sliding contact with the arc-shaped lower peripheral portion of the small-diameter shield body 21. I have. The front and rear ends of the small-diameter shield body 21 project from the front and rear ends of the shield main body 1 in the front and rear direction, respectively. Further, the small-diameter circular cutter head 20 has radially formed slits 22 for taking in earth and sand communicating with the front and rear surfaces, and has a plurality of cutter bits 23 projecting along the slits 22 on the front surface. The position of the circular cutter head 20 is not limited to the lower peripheral side of the shield body 1 as described above, and a part of the circular cutter head 20 is overlapped with the ring-shaped cutter head 5 at an appropriate position in the opening of the shield body 1. The structure arranged as described above may be used.

A partition 24 is integrally provided at the front end of the small-diameter shield 21, and a rotary shaft 25 of the circular cutter head 20 is rotatably inserted and supported in the center of the partition 24. Is rotated by a rotary drive motor 26 disposed on the back of the camera. Then, by the excavation of the circular cutter head 20, a small-diameter tunnel 28 serving as a work pit 27 is excavated behind the small-diameter shield body 21.

Reference numeral 29 denotes a concrete casting pipe inserted in several places of the press ring 13 so as to penetrate in the front-rear direction, with a rear end opening thereof facing rearward from the rear surface of the press ring 8 and a front end facing the equipment room. 4 is connected to and communicated with a concrete supply pipe 30 arranged in a ring shape in the ring 4.
It is connected and communicated via a suitable joint to a concrete transport pipe 31 made of a flexible tube which is arranged so as to be able to be added to the inside of the work pit 27 from inside.

Further, inside the small-diameter shield body 21, the tip is connected to the sediment intake chamber 3 on the rear side of the ring-shaped cutter head 5 and the sediment intake chamber 32 on the rear side of the small-diameter circular cutter head 20, respectively. Pipes 33, 34, 35, 36 and a back-filled injection pipe whose tip is open to the outside from the inner and outer cylindrical frames 1a, 1b of the shield body 1.
37, and these pipes 33 to 37 are also provided so as to be refillable through the work well 27.

In order to construct a ring-shaped lining along the outer peripheral surface of a planned tunnel to be constructed using the ring-shaped lining device for a large-diameter tunnel constructed as described above, the starting shaft is required to be buried underground to a desired depth. After the excavation of the reaching shaft (not shown) and the installation of the apparatus in the starting shaft, the shield body 1 is propelled while rotating the ring-shaped cutter head 5 and the small-diameter circular cutter head 20, and FIG. As shown in FIG. 4, concrete is poured into the ring-shaped excavation mark formed at the rear of the main body from the inside of the main body to form a ring-shaped lining 38, while the small-diameter tunnel 28 excavated by the circular cutter head 20 is formed. The work pit 27 is formed by segment lining 39.

FIG. 5 shows a state in which concrete has been poured into a ring-shaped space of a fixed length excavated by the ring-shaped cutter head 5 of the shield body 1, and FIG. The ring 13 and the moving frame 15 are retracted toward the equipment room 4 of the shield body 1.

In this state, the drive motors 8 and 26 are operated to rotate the ring-shaped cutter head 5 and the small-diameter circular cutter head 20, thereby excavating the cutting face and extending the propulsion jack 14 as shown in FIG. The press ring 13 is pushed rearward to consolidate the concrete poured into the moving frame 15, while taking a reaction force on the front end face of the cast concrete to move the shield body 1 forward, and the face ground is pushed by the propulsion jack 14. The cutter head 5 has a length corresponding to the extension dimension of
Excavated by 20.

By extending the tension jack 19 in accordance with the excavation of the shield main body 1, the moving frame 15 is greatly protruded rearward, and the cast concrete is gradually hardened in the moving frame 15 to form a ring-shaped lining 38. I will do it. When the shield body 1 excavates for a certain length, as shown in FIG. 7, the propulsion jack 14 and the pulling jack 19 are contracted, and the press ring 13 and the moving frame 15 are moved into the equipment room 4, and the lining 38 is formed.
A ring-shaped space 40 having a fixed length is formed between the front end face of the press ring 13 and the press ring 13.

On the other hand, a small-diameter tunnel 28 whose outer periphery partially cuts into the ring-shaped lining 38 is excavated by the small-diameter circular cutter head 20, and a segment covering is performed in the tail portion of the small-diameter shield body 21 every time the above-mentioned fixed length is excavated. Work 39 to construct a work shaft 27, and use the inside of the work shaft 27 from the starting shaft side
Piping such as 33-36 and back filling pipe 37 is performed. This segment lining work is performed by an operator every time the shield main body 1 is excavated for a certain length to form a continuous working pit 27. If necessary, as shown in FIG. 4, a base plate 41 is laid in the work pit 27, and each of the above-mentioned pipes is disposed in a space below the base plate 41. It may be used for entering and exiting and other work spaces. In this way, after forming the working pit 27 or during formation, a backing agent such as mortar is supplied from the starting shaft side through the backing injection pipe 37, and a backing agent layer 33 having an appropriate thickness is provided on the outer surface of the moving frame 16. Form.

Next, after the working shaft 27 is formed, the appropriately mixed concrete is flowed and supplied from the starting shaft side through the concrete transport tube 31 and the concrete is supplied from the concrete supply tube 30 to the ring-shaped space 40 through the casting tube 29. Is poured and filled to form a ring-shaped lining portion that is continuously integrated with the lining 38 already formed. After the concrete is poured into the space 40, the cutter head 5 is rotated again and the press ring 13 is pushed forward to consolidate the poured concrete so that a reaction force is supported on the front end face thereof, and the shield body 1 is excavated for a certain length. Let it. Hereinafter, the step of forming the ring-shaped space portion 40 by contraction of the press ring 13, the step of forming the work pit 27 by assembling the segments, the step of forming the backing agent layer,
Large-diameter ring-shaped lining 38 from the starting shaft to the reaching shaft 38 by sequentially repeating the concrete placing process into the space 40
Is to be constructed.

The direction of excavation of the shield body 1 is corrected and controlled by the propulsion jack 9. A mud tank (not shown) disposed on the starting shaft side and the sediment intake chambers 3 and 32 of the shield body 1 are connected and communicated with mud pipes 33 to 36, and mud water is pumped into these pipes. The earth and sand excavated by the cutter heads 5 and 20 are discharged to the starting shaft side by reflux. In addition,
Such discharge of excavated earth and sand does not depend on the return mud,
It may be transported and discharged to the starting shaft side by the toro bogie (not shown) through the inside of the work shaft 27.

After or after the formation of the large-diameter ring-shaped lining 38, the ground surrounded by the lining 38 is excavated by an appropriate excavator to construct a large-diameter tunnel. After the formation of the lining 38, the working pit 27 may be buried by casting and filling concrete in the working pit 27.

[0028]

As described above, according to the apparatus for lining the planned tunnel of the present invention, the shield main body is formed of a cylindrical inner and outer double frame, and the cutter head is rotatable at the front end opening of the main body. Since the cutter head is provided, the cutter head can excavate the face smoothly and uniformly in a ring shape, and a precise ring-shaped space portion can be formed at the rear end side by the propulsion of the main body. It is possible to efficiently construct a series of ring-shaped linings by placing concrete in the space.

Further, a press ring is disposed in the rear end of the shield main body so as to be movable back and forth, and the press ring is configured to be moved back and forth by a propulsion jack disposed in an intermediate portion of the shield main body. After placing concrete in the ring-shaped space, the concrete is pressed by a press ring, the reaction force is received on the concrete end face, and the face is dug in a ring shape while accurately propelling the shield body. In addition, it is possible to continuously form a lining having a uniform thickness corresponding to the thickness between opposed inner surfaces of the inner and outer double cylindrical frames forming the shield main body.

Further, since a small-diameter circular cutter is disposed at the front end opening of the shield body so as to partially overlap the ring-shaped rotary cutter head, the ring-shaped cutter head is used for ring-shaped lining. Simultaneously with the excavation of the hole, a small-diameter tunnel can be excavated on the inner peripheral side of the ring lining hole. The work pit can be used to make a concrete transport pipe, discharge of earth and sand, etc., and the ring lining can be performed smoothly and efficiently.

In addition, since the working pit is provided on the inner peripheral side of the ring-shaped lining, the work for arranging the ring-shaped lining can be easily performed without being obstructed by the working pit, and the strength is improved. Can form a large ring-shaped lining.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of a lining device,

FIG. 2 is a simplified front view of a cutter head,

FIG. 3 is a simplified longitudinal side view of a ring-shaped lining and a small-diameter tunnel built by a lining device,

FIG. 4 is a longitudinal sectional front view of the constructed lining,

FIG. 5 is a longitudinal sectional side view in a state where concrete is poured into a ring-shaped space,

FIG. 6 is a longitudinal sectional side view showing a state where a press ring is extended;

FIG. 7 is a longitudinal sectional side view showing a state in which a ring-shaped space is formed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield body 1a Outer cylinder frame 1b Inner cylinder frame 5 Ring-shaped cutter head 13 Press ring 14 Propulsion jack 20 Small-diameter circular cutter head 21 Small-diameter shield body 27 Small-diameter tunnel 38 Ring-shaped lining

Claims (1)

(57) [Claims] 1. A ring-shaped rotary cutter head is disposed at a front end opening of a shield body composed of a cylindrical inner and outer double frame, and a press ring is disposed at a rear end of the shield main body so as to be movable back and forth. In order to consolidate the lining concrete cast into the ring-shaped excavation hole excavated by the cutter head, furthermore, a small-diameter shield body is integrally provided at an appropriate position on the inner peripheral portion of the inner cylindrical frame of the shield body, A small-diameter circular cutter is arranged at the front end opening of the small-diameter shield body, and holes drilled by the rotation of the circular cutter are configured as a piping passage such as a concrete transport pipe or a sediment discharge passage. The outer ring lining device of the planned tunnel.