JP2000248896A - Backfilling material filling method in tbm method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filling method for a backfilling material in TMB method capable of injecting a backfilling material to tail void immediately after encountering with poor natural ground and the liner has been pushed out to the natural ground portion. SOLUTION: Backfilling method in the TBM method excavates underground by a TBM 1 and, if it encounters poor natural ground portion, the failure or the like of the natural ground A is prevented by using liner 5 and, in this case, urethane foam 6-2 is adhered in the peripheral direction on the outer peripheral surface of the liner 5 assembled in the tail 1a, thereby forming bulkhead and a backfilling material C is injected in a void portion B between the liner 5 and natural ground A between the bulkhead and the urethane foam 6-1 adhered previously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a backing material injection method in a TBM method.

[0002]

2. Description of the Related Art In the TBM method, when a defective ground portion is encountered, a liner is used to prevent the collapse of the ground, etc., and a method of filling a void portion between the liner and the ground is required. Regarding the materials, insufficient construction was still carried out.

That is, unlike the shield, the TBM cannot stop water from the tail due to the absence of a tail seal, and the liner does not have a watertight structure, so that it cannot be injected immediately during or after excavation. For this reason, in the related art, after the support is assembled, a material such as pea gravel or the like is filled as a backing material from the rear of the TBM to the rear of the rear end of the TBM by a diameter or more (in practice, it is often behind the succeeding bogie).

[0004] However, from a design standpoint, it is desired to fill the void portion with the backing material as soon as possible after the liner is extruded into the ground portion. The longer it is left, the more loosening of the ground spreads from that part, often leading to troubles such as collapse.

In the TBM method, since a gripper is used for excavation, the reaction force becomes insufficient in the case of soft ground. Therefore, even if an attempt is made to obtain a reaction force from the liner, the liner fluctuates, and a sufficient reaction force cannot be obtained.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, that it can be injected immediately, that the backing material does not flow backward, that the material is compact so that it can be made in a downhole, The purpose of the present invention is to provide a backing material injection method in the TBM method that can achieve the following.

[0007]

According to the present invention, a TBM is provided.
When excavating underground by the construction method and encountering a bad mountainous area, using a liner (including a segment: in this specification, the word "liner" is used as a word including a segment), collapse of the ground, etc. In order to prevent, the urethane home is stuck in the circumferential direction on the outer peripheral surface of the liner assembled in the tail to form a bulkhead, and between the urethane home stuck last time, the liner and the ground The backing material is injected into the void. This method is used when the unevenness of the excavation wall is relatively small.

Further, according to the present invention, underground excavation is performed by the TBM method, and when a bad mountain is encountered, a liner is used.
To prevent the collapse of the ground, etc., paste the bag material in the circumferential direction on the outer peripheral surface of the liner assembled in the tail,
A backing material is injected into the bag material to form a bulkhead, and the backing material is injected into the void between the liner and the ground between the bag material into which the backing material has been injected previously. This method is used when the unevenness of the excavation wall is relatively large.

As an example of the backing material, the mortar and the rapid curing agent are separately conveyed, and immediately before being injected into the void portion between the liner and the ground, the two are mixed to form a backing material.

According to the present invention, the backing material can be injected into the void between the liner and the ground immediately after the liner is extruded into the ground, and the liner can be left standing for a long time.
Prevents collapse due to loose ground.

Further, according to the present invention, the backing material can take a reaction force during excavation with the liner integrated with the ground, and the gripper cannot take a sufficient reaction force by the TBM method. Excavation of bad mountain areas can be carried out efficiently.

[0012]

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

FIG. 1 and FIG. 2 show an example which is carried out when the unevenness of the excavation pit wall is relatively small. Transport. In the excavation, take the reaction force with clipper 4. In this case, in the case of soft ground, the reaction force is insufficient.

Incidentally, as the conveyor 2, an arbitrary one such as a screw conveyor or a belt conveyor can be used. In the illustrated example, a rear bogie is used. However, known shearing-out means such as a steel wheel type, a continuous conveyor type, and a tire type can be used.

When encountering a defective ground such as soft ground, a liner 5 is laid and the ground A
Will be prevented.

A urethane home 6-2 is attached to the outer peripheral surface of the liner 5 assembled in the tail 1a of the TBM 1 in a circumferential direction to form a bulkhead. The backing material C is injected into the void B between the liner 5 and the ground A.

The backing material C is injected into the injection cart 7 by the mortar transport tank 8, the rapid hardener transport tank 9, the injection pump 1
0, the pump control panel 11 is mounted, and the mortar and the rapid curing agent are transported through separate pipes 12 and 13, respectively, and are mixed and injected as a backing material immediately before being injected into the void B. The injection control is performed on the injection base 14.

As a result, the gap between the tail voids B is filled with the backing material C, and the liner 5 and the ground A are integrated into a single structure, thereby stabilizing the structure.

FIG. 3 and FIG. 4 show an embodiment which is carried out when the unevenness of the excavation pit wall is relatively large. A bag material 6A-2 is circumferentially attached to the outer peripheral surface of the liner 5 assembled in the tail 1a. A backing material is injected through an injection hole (not shown) into the bag material 6A-2 to form a bulkhead, and between the bag material 6A-1 into which the backing material has been injected previously, The backing material C is injected into the void B between the liner 5 and the ground A.

The backing material C is injected into the tail void B in the same manner as in the example shown in FIGS.
Is filled with the backing material C, and the liner 5 and the ground A are integrated.

In any of the examples, the gap between the tail voids B is filled with the backing material C to form the liner 5 and the ground A in an integrated structure, so that when the soft ground is excavated by the TBM method, With this, the reaction force at the time of excavation can be taken, and the excavation is performed with the necessary sufficient reaction force.

As a use condition, the urethane home expands when it is released, but the expansion rate is limited.
The example shown in FIG. 2 is performed when the unevenness of the excavation wall is relatively small.

On the other hand, since the bag material can cope with unevenness according to the size of the bag, the unevenness of the excavation pit wall is relatively large by adjusting the size of the bag according to the ground conditions. It is carried out in the case.

The backing material is not limited to the mortar to which the rapid hardening agent is added, but may be any other material having the required strength and fluidity.

[0025]

According to the present invention, the backing material can be injected into the void portion between the liner and the ground immediately after the liner is extruded into the ground, and the ground can be left standing for a long time. Prevent troubles such as collapse due to loose mountains.

Further, according to the present invention, the backing material can take a reaction force during excavation with the liner integrated with the ground, and the TBM method cannot take a sufficient reaction force with the gripper. Excavation of bad mountain area can be performed efficiently.

Further, it is only necessary to attach a urethane home or a bag material to the liner assembled in the tail, which can be implemented at low cost, and is compact and can be made in a pit.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a TBM method performed when the unevenness of an excavation pit wall is relatively small.

FIG. 2 is a longitudinal sectional view of a TBM method performed when the unevenness of the excavation wall is relatively small.

FIG. 3 is an external perspective view of the TBM method performed when the unevenness of the excavation wall is relatively large.

FIG. 4 is a longitudinal sectional view of the TBM method performed when the unevenness of the excavation pit wall is relatively large.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... TBM 2 ... Conveyor 3 ... Back trolley 4 ... Gripper 5 ... Liner 6 ... Urethane home 6A ... Bag material 7 ... Injection trolley 8 ... Mortar transportation Tank 9: Rapid hardener transport tank 10: Injection pump 11: Pump control panel 12: Mortar transport pipe 13: Hardener transport pipe 14: Injection hand board

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masakazu Matsuda Kashima Construction Co., Ltd. 1-2-7 Moto Akasaka, Minato-ku, Tokyo (72) Inventor Osamu Kano 6 Nagao, Tama-ku, Kawasaki City, Kanagawa Prefecture −26−10 (72) Inventor Yoichiro Nitta 1-18-2-204 Fama, Tama-ku, Kawasaki-shi, Kanagawa F-term (reference) 2D054 AC20 2D055 JA04 JA06 KA08 KB12

Claims (4)

[Claims] When excavating underground by the TBM method and encountering a bad ground part, using a liner to prevent the collapse of the ground, etc., the outer circumferential surface of the liner assembled in the tail has a circumferential direction. A backing material injecting method in the TBM method, wherein a backing material is injected into a void portion between a liner and a ground, by attaching a urethane home to a bulkhead. 2. When the underground is excavated by the TBM method and a bad ground portion is encountered, a liner is used to prevent the collapse of the ground. A backing material in the TBM method, wherein a backing material is injected into the bag material, a backing material is injected into the bag material, a bulkhead is formed, and the backing material is injected into a void portion between the liner and the ground. Material injection method. 3. The mortar and the rapid curing agent are separately transported,
3. The backing material injection method in the TBM method according to claim 1, wherein the backing material is mixed into a backing material immediately before being injected into a void portion between the liner and the ground. . 4. When excavating a defective ground portion by the TBM method, a backing material is used to form a liner integrated with the ground.
The backing material injection method in the TBM method according to claim 1 or 2, wherein a reaction force during excavation is taken.