JPH11350872A - Obstacle cutting device and obstacle recovery device and obstacle removing device in sealed type shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of cutting an obstacle efficiently and having a simple structure. SOLUTION: An obstacle H is cut by rotating and pressing a cutting bit 25 of a core cutter 22 against the obstacle H. The core cutter 22 is moved in a condition in which a cut piece cut away from the obstacle H is taken into a steel pipe, and then the obstacle H is cut in succession. Since the cut piece taken in previously is pushed backward by the cut piece cut away later, it drops into a chamber 15 from a latter half cut part of the steel pipe. After all the obstacles H are cut, a shield machine 10 advances, and the cut pieces are taken into a collection box 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obstruction cutting device and an obstruction recovery device provided in a sealed shield machine.
Also, the present invention relates to a method for removing an obstacle that has appeared on the front of a shield machine.

[0002]

2. Description of the Related Art In a major urban area where population is remarkably concentrated, when constructing a structure in an underground space by a shield method, existing structures and their foundations appear on a shield plan line due to congestion of ground and underground structures. However, the number of cases that may hinder shield excavation is increasing. In recent years, the shield construction method has become the mainstream in consideration of the impact on the surroundings, etc., and it is impossible to directly check the situation in front of the face during construction with this closed shield excavator due to its structure. It is possible.

Therefore, when an obstacle appears on the front face of the face by the closed shield method, conventionally, the ground improvement around the obstacle is carried out by injecting a chemical solution or the like, and the face is stabilized by applying a limited pressure in the chamber. After taking countermeasures, a method is generally adopted in which a worker goes to a face to remove obstacles. Also, if it is clear from the construction planning stage that there are obstacles, change to the open cut method, use an open shield to make it easier to remove the obstacles, or use a closed shield at the shaft on the way. In some cases, a method such as modification to an open shield is adopted.

However, in these methods, the stability of the face has to depend on the ground improvement such as injection of a chemical solution or the auxiliary method such as the pneumatic method, which is a bottleneck in terms of economy and construction time. Also, in such a situation, since the worker has to work in a narrow face space,
Improvement measures are also expected in terms of safety, workability, and workability.

[0005] The types of obstacles that appear on the planning line of the shield tunnel include piles and earth retaining materials. These materials include steel materials such as H-section steel, steel pipe, steel sheet pile, RC,
Wood etc. are mentioned. Among these, wood can be cut with a normal cutter bit attached to a shield machine, and there is no particular problem in shield excavation. In the case of steel and RC, when they appeared alone, there were cases where they were cut with a normal shield machine without special measures, but in such a case, the cutter bit was damaged by the cutting, and the bit was replaced immediately afterwards. And other measures are required. From such a viewpoint, it is required to establish a construction method that enables an operator to smoothly remove obstacles without coming to the face with a closed shield.

[0006] The inventors of the present application first disclosed in Japanese Patent Application Laid-Open No. 10-376.
No. 68, an apparatus for cutting an obstacle by pressing a rotary core cutter having a diamond tip on a front end of a steel pipe against the obstacle, wherein the cutting apparatus is configured to cut the cutting face side from the opening of the cutter head into the chamber. An obstruction cutting device for a hermetically sealed shield machine which is mounted so as to be able to move forward and backward and move freely in the radial direction of the cutter head is disclosed. The publication further discloses a method of removing an obstacle, characterized in that after the obstacle is cut by the obstacle cutting device, the cut piece taken into the core cutter is gripped by a gripping hand and discharged to the rear of the chamber. ing.

However, in the obstacle cutting device described in the above publication, after cutting the obstacle, the core cutter is retracted, the cut piece is gripped by the gripping hand, and then the cut piece is taken into the rear unloading lock. The obstacles are collected, and the removal operation after cutting the obstacles is complicated.

[0008] Further, it has been attempted to carry out a cut piece of an obstacle from a chamber through a mud pipe together with the mud in a closed shield excavator, but this may cause blockage of the mud pipe. In addition, problems such as disassembling and assembling pipes at the time of blockage have been pointed out. In addition, the problem concerning the blockage of the drainage pipe is not limited to the cut pieces of the obstacles, but is also a problem that can occur with large and small gravels mixed in the muddy water after excavation.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a sealed shield machine capable of removing an obstacle that has appeared on the front surface of a shield without an operator coming out of the face.
An object of the present invention is to provide an obstacle cutting device that can efficiently cut an obstacle and has a simple structure. Another object of the present invention is to provide an obstacle collecting device that does not have a possibility of blocking the drainage pipe. Further, the present invention provides a method of removing obstacles that can smoothly transport a cut piece of the obstacle to the rear of the chamber using the above-described device and recover the same inside the machine. Is what you do.

[0010]

SUMMARY OF THE INVENTION An obstruction cutting device for a sealed shield machine according to the present invention cuts the obstruction by pressing a rotary core cutter having a cutting bit at the front end of a steel pipe against the obstruction. An apparatus, wherein the cutting device moves forward and backward through the face and the chamber from the opening of the cutter head.
The steel pipe is mounted so as to be retractable and movable in the radial direction of the cutter head, and a rear half of the steel pipe is cut off substantially over a half circumference.

An obstruction recovery device for an enclosed shield machine according to the present invention is an obstruction recovery device installed in a rear wall of the enclosed shield machine, wherein the recovery device includes:
It is provided with a gate capable of closing an opening provided at the lowermost part of the partition wall for taking in the cut pieces of the obstacle together with the mud, and a mud pipe is connected to the collecting device. Things.

[0012] In the method for removing obstacles of the sealed shield machine according to the present invention, the obstacles are cut continuously by the obstacle cutting device according to claim 1, and the cut pieces taken into the core cutter fall into the chamber. Then, by moving the shield machine forward, the cut pieces accumulated in the chamber are taken into the obstacle collecting device installed in the machine behind the partition wall. The obstruction collecting device may be configured as follows.
It is preferable that the obstacle collection device described above is used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention applied to a muddy shield machine will be described below in detail with reference to the drawings.

FIG. 1 is a side view showing a main part of the sealed shield machine 10 in a longitudinal section, and FIG. 2 is a front view thereof. The shield machine 10 excavates the ground by rotating a cutter head 12 provided on the front surface of the shield 11 by a drive motor 13, and fills a chamber 15 between a partition wall 14 and a face with pressurized muddy water. Thus, a normal mud shield type in which excavated earth and sand is taken into muddy water and fluid is transported as muddy water while stabilizing the face.

The shield machine 10 employs an intermediate support system as a support system for the cutter head 12, and the rotating shafts 16 of the cutter head 12 are rotated by a drive motor 13 connected via a gear 17. It has become. Further, the partition wall 14 is fixed to the skin plate of the shield 11 and has an outer peripheral annular portion 14A having an opening at the shield center, and rotates together with the rotating shafts 16 and 16 to have a size capable of closing the opening of the outer peripheral annular portion 14A. Central part 14
B. In addition, in FIG.
Is a mud pipe and a mud pipe for muddy water, respectively.

As shown in FIG. 2, a large number of drill bits 21, 21... Are embedded in the cutter head 12 at predetermined intervals in the radial direction.
A slit (not shown) is provided along 1..., And the earth and sand excavated from this slit is taken into the chamber 15 on the back side. Code 19
Is an opening provided in the cutter head 12 for allowing a core cutter 22 described later to advance from the chamber 15 toward the face.

The obstacle cutting device 20 of the present invention is provided in the chamber 15 of the shield machine 10. As shown in FIG. 3, a core cutter 22 constituting a main body of the cutting device 20 is provided with a diamond or cemented carbide cutting bit 25 at a front end portion of a steel pipe 24 having an inner diameter of about 0.6 to 1.0 m. It is arranged in. Therefore, in this embodiment, steel or RC having a diameter or a width of about several hundred mm to 1 m is targeted as an obstacle.

3 (a) is a side view of the core cutter 22, FIG. 3 (b) is an end view taken along the line bb in FIG. 3 (a), and FIG. 3 (c) is c in FIG. 3 (a). FIG. Reference numeral 23 denotes a cutter driving motor.

The latter half of the steel pipe 24 constituting the core cutter 22 is cut off at a substantially half circumference so that a cut piece of an obstacle taken into the steel pipe 24 by the cutting can be dropped.

The core cutter 22 is attached to slide devices 27, 27 installed in the rear portion thereof in parallel with the diameter direction of the shield 11 via a support portion 26, and the slide device 27 is shielded by a shield plate on the skin plate of the shield 11. It is movably mounted along a pair of upper and lower rails 28 laid in the direction. Therefore, the core cutter 22 can be moved in the radial direction of the cutter head 12 to an arbitrary position from the central portion of the shield to the outermost peripheral portion by the operation of the slide device 27.

A cutter slide jack 29 is connected between the rear end of the core cutter 22 and the partition center 14B so that the core cutter 22 can be moved in the front-rear direction. Therefore, the core cutter 22
Is mounted so as to be able to move forward and backward on the face side and inside the chamber 15 from the opening 19 of the cutter head 12 by the operation of the cutter slide jack 29.

Next, the obstacle collecting device of the present invention will be described. In the present embodiment, the obstacle recovery device is shown as a storage box 30 for obstacles, which is installed at the rear of the peripheral wall portion 14A of the partition wall. In addition, the partition outer peripheral annular portion 14
At the bottom of A, an opening 32 for taking in a cut piece of the obstacle together with the mud is provided.
Is provided with a gate 33 capable of blocking the opening 32 of the outer peripheral annular portion 14A.

FIG. 4 is a rear view of the opening 32 of the outer peripheral annular portion 14A viewed from the storage box 30 side.
A, 33B are hydraulic jacks 35, 3 connected to these.
5 slides along the guide rails 36, 36 so that the opening 32 is opened or closed. The drain box 9 is connected to the storage box 30.

Next, a method of removing the obstacle H by the cutting device 20 and the storage box 30 as a recovery device will be described.

When an obstacle H such as an H-beam appears in front of the shield machine 10, the shield machine 10 is stopped immediately before the obstacle H. In this state, the core cutter 22
Is stored in the chamber 15 behind the opening 19,
Protected from damage due to wear and the like.

Next, the core cutter 22 is moved to the cutting position of the obstacle H. The core cutter 22 opposes the obstacle H appearing at any position in the shield cross section by appropriately combining the movement in the shield circumferential direction by the rotation of the cutter head 12 and the movement in the shield radial direction by the slide device 27. Can be moved up.

Thereafter, the core cutter 22 housed in the chamber 15 is advanced by operating the cutter slide jack 29 so as to protrude forward from the opening 19 of the cutter head 12. Next, the cutter motor 23 is driven to push the cutting bit 25 of the core cutter 22 against the obstacle H while rotating, thereby obtaining the reaction force on the back side of the obstacle H and the strength of the obstacle H itself to cut the obstacle H. I do. At this time, by adjusting the rotation speed and the feed speed of the core cutter 22, it is possible to perform an optimal cutting operation according to the type and hardness of the obstacle H.

The cut piece separated from the obstacle H is a steel pipe 2
When the core cutter 22 is moved in the state where it is taken in 4 and the obstacle H is continuously cut, the cut piece taken in earlier is pushed backward by the cut piece that was cut off later, Chamber 1 from the second half cut section of steel pipe 24
Fall into 5.

When all the obstacles H have been cut or the cut pieces are sufficiently accumulated in the chamber 15, the shield excavator 10 is advanced to take the cut pieces into the storage box 30. At this time, the gate 33 is kept open. Subsequently, when the cut pieces are collected in the storage box 30, the gate 33 and the gate 7 of the exhaust pipe are shut off.
Then, after draining the muddy water in the storage box 30, the cut pieces are carried out of the storage box 30.

Finally, the gate 33 is opened, the inside of the storage box 30 is pressurized with muddy water, and the internal pressure of the storage box is made equal to the face pressure.

The cutter head 20 of the present invention can be applied to a spoke type structure in addition to the above face plate type.
Further, any type of hermetic shield excavator can be applied, and any type of earth pressure shield or mud pressure shield excavator can be applied. Also, there is no restriction on the support method of the cutter head, center support,
Either the intermediate support or the outer peripheral support can be adopted.

[0032]

According to the first aspect of the present invention, it is possible to continuously and efficiently cut an obstacle,
The subsequent operation of collecting the cut pieces of the obstacle becomes extremely easy. Further, the structure of the obstacle cutting device is simple, and the manufacturing cost is low.

According to the second aspect of the present invention, there is no possibility that the mud drainage pipe will be blocked when collecting obstacles. Therefore, there is no need to disassemble and assemble the pipe at the time of the blockage, and it is possible to efficiently perform the work of collecting obstacles. In addition, large and small gravels mixed in the drilling mud can be separated and collected by the present collecting device.

According to the third or fourth aspect of the present invention, it is possible for an operator to smoothly cut and remove an obstacle that has appeared in front of the shield without coming out to the face. In particular, without wasting time cutting and collecting obstacles,
Removal work can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a sealed shield machine in a longitudinal section.

FIG. 2 is a front view of the sealed shield machine.

FIG. 3 (a) is a side view of a core cutter, and FIG. 3 (b)
3A is an end view taken along the line bb in FIG. 3A, and FIG. 3C is a cross-sectional view taken along the line cc in FIG. 3A.

FIG. 4 is a rear view of the opening of the outer peripheral annular portion of the partition wall viewed from the storage box side.

[Explanation of symbols]

 Reference Signs List 9 sludge pipe 10 shield excavator 12 cutter head 14 bulkhead 15 chamber 19 cutter head opening 20 obstacle cutting device 22 core cutter 24 steel pipe 25 cutting bit 30 storage box as obstacle recovery device 32 partition wall opening 33 gate 35 Hydraulic jack

Continuation of front page (72) Inventor Katsumi Miyagawa 1-8 Tsukudocho, Shinjuku-ku, Tokyo Inside Kumagaya Gumi Tokyo Branch (72) Inventor Kazuhiro Naozuka 2-1, Tsukudocho, Shinjuku-ku, Tokyo Kumagaya Co., Ltd. Gumi Tokyo Head Office

Claims (4)

[Claims] 1. A device for cutting an obstacle by pressing a rotary core cutter having a cutting bit at a front end of a steel pipe against the obstacle, the cutting device comprising: Characterized in that the steel pipe is mounted so as to be able to move forward and backward and move freely in the radial direction of the cutter head, and the rear half of the steel pipe is cut off substantially over half the circumference. Object cutting device. 2. An obstacle collecting device installed in a rear wall of a sealed shield excavator, wherein the collecting device includes:
A sealed shield excavation characterized by comprising a gate capable of closing an opening provided at the lowermost portion of the partition wall for taking in a cut piece of the obstacle together with the mud, and a mud pipe connected to the gate. Obstacle recovery device for the machine. 3. An obstacle cutting device according to claim 1, wherein the obstacle is continuously cut, a cut piece taken into the core cutter is dropped into the chamber, and the shield excavator is advanced, so that the chamber is moved forward. A method for removing obstacles, wherein the cut pieces accumulated in the inside are taken into an obstacle recovery device installed in the machine behind the bulkhead. 4. The obstacle removing method according to claim 3, wherein the obstacle collecting apparatus is the obstacle collecting apparatus according to claim 2.