JPH10169363A - Cutoff method and device of arrival section in method of shield construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance cutoff properties by a small quantity of cutoff materials without jointly using a soil-improvement method. SOLUTION: An annular groove 10 is formed to the outer circumference of a section near to a cutter disk 1 of a skin plate 4, and a tube seal 16 and a seal 17 are housed in the annular groove 10. When the front end of the skin plate 4 has reached the inside B of a tunnel filled with water, the tube seal 16 by water is bulged, the seal 17 is expanded and a clearance with a pit wall A is sealed, and a cutoff material is injected into the clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for stopping water at a reaching part in a shield method.

[0002]

2. Description of the Related Art In a temporary wall cutting method in which a temporary wall is directly cut with a shield, there is no reliable water stopping method at a construction site where groundwater pressure is high. Are often used together, and the construction period becomes longer.

[0003] In addition, in the method of injecting the water-stopping material into the gap between the shaft wall and the skin plate of the shield machine, a large amount of the water-stopping material is required. In some cases, a waterproof body is not formed.

[0004] The applicant of the present invention is Japanese Patent No. 2512257.
No., JP-B 8-19822, JP-B 8-1982
Japanese Patent Publication No. 3 proposes a method and an apparatus for mechanically joining a shield machine using a tube seal.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a method and an apparatus for stopping water at a reaching part in a shield method in which the water stopping property can be improved with a small amount of water stopping material without using a ground improvement method. It is intended to be.

[0006]

According to the method of the present invention, when the shield machine approaches the reaching shaft, the shaft is filled with water, the pit wall is drilled with a cutter disk, and a plurality of holes are provided on the outer periphery of the cutter disk. Jet water is jetted from the water injection port to excavate while scattering concrete powder.When the front end of the skin plate of the shield machine reaches the shaft, the shield machine is stopped, and then the flexible plate built in the outer periphery of the skin plate The present invention is characterized in that the annular body is bulged to seal a gap between the skin plate and the shaft shaft wall, and the gap is filled with a waterproof material.

[0007] The apparatus according to the present invention comprises an annular groove having an inverted T-shaped cross section formed on the outer periphery of a portion of the skin plate of the shield machine close to the cutter disk, and a water injection pipe opening at the bottom of the T-shaped cross section. A first flexible plate-like annular body having both edges fastened to both ends of the bottom, and a second flexibility having one edge fastened to an end of the bottom near the cutter disc. It has a plate-shaped annular body, and a water-stopping material injection pipe opened on the outer periphery of the skin plate on the side facing the cutter disk of the annular groove.

According to the present invention, when the front end of the skin plate reaches the inside of the well filled with water, water is injected to swell the first flexible plate-like annular member, thereby forming the second plate-like annular member. Is opened to seal the gap with the pit wall, and the waterproof material is injected into the gap.

[0009]

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

In FIG. 1, a plurality of injection ports 2 are provided on an outer periphery of a cutter disk 1 of a shield machine, and jet water 3 is injected outward in a radial direction.

A skin plate 4 is provided at the back of the cutter disk 1. Near the front end of the skin plate 4, an annular groove having an inverted T-shaped cross section indicated by reference numeral 10 as shown in FIG. Has been established.

At the approximate center of the bottom 11 of the annular groove 10,
The water injection pipe 18 is open. A first flange groove 12 is formed on the front side of the bottom 11, and the flange groove 12 has a cone-shaped inclined surface 1 extending radially outward and rearward.
3 are consecutive. Also, on the rear side of the bottom part 11, the first
A second flange groove 14 that is thinner than the flange groove 12 is formed, and a vertical surface 15 facing outward in the radial direction is continuous with the front end of the flange groove 14. The annular groove 10 is provided with first and second flexible annular bodies, that is, a tube seal 16 and a seal 17.

The front edge of the tube seal 16 is fitted into the first flange groove 12 together with the front edge of the seal 17. The rear edge of the tube seal 16 is
And the rear edge of the seal 17 is
It is extended to near the vertical plane 15 and is free. Further, on the outer periphery of the skin plate 4 near the rear of the annular groove 10, a water-stopping material injection pipe 19 is opened.

Next, a method for stopping water at the reaching portion will be described.

When the front surface of the cutter disk 1 of the shield machine approaches the pit wall A of the reaching shaft, water is filled in the pit B of the pit, and the pit wall A is drilled while jet water 3 is jetted from the injection port 2. The concrete powder is scattered by the jet water 3 and excavated. When the front end of the skin plate 1 reaches the underground B, the shield machine is stopped and the jet water 3
Stop injection.

Next, water W is injected from the water injection pipe 18 between the bottom 11 and the tube seal 16. Then, the tube seal 16 swells radially outward as shown in FIG. Therefore, the seal 17 is pushed and expanded along the inclined surface 13, and the free trailing edge is pressed against the pit wall A and the pit wall A
And the gap C between the skin plate 4 is sealed. Therefore,
The gap C is filled with the water stopping material 21. Finally, drain the water stretched into mine B and finish.

[0017]

Since the present invention is configured as described above, it has the following effects. (1) Water can be stopped mechanically by tube seals and seals, and water can be reached by simply filling the shaft without using ground improvement methods such as vertical shaft partitioning method and chemical liquid injection method. Thus, the construction period can be shortened. (2) After the seal is brought into close contact with the shaft wall, the water in the shaft is drained to apply water pressure, thereby further improving the water stopping performance. (3) The injection amount of the waterproof material can be made smaller than before.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view showing a state before a water stop state according to an embodiment of the apparatus of the present invention.

FIG. 2 is a side sectional view showing details of an annular groove.

FIG. 3 is a side sectional view showing a water stop state.

[Explanation of symbols]

 A ... pit wall B ... pit 1 ... cutter disc 2 ... injection port 3 ... jet water 4 ... skin plate 10 ... annular groove 11 ... bottom part 12 ... 1st flange groove 13 ・ ・ ・ Slope surface 14 ・ ・ ・ 2nd flange groove 15 ・ ・ ・ Vertical surface 16 ・ ・ ・ Tube seal 17 ・ ・ ・ Seal 18 ・ ・ ・ Injection pipe 19 ・ ・ ・ Water stop material Injection pipe 20 ・ ・ ・ Water 21 ・ ・ ・ Waterproof material

Claims (2)

[Claims] When the shield machine approaches the reaching shaft, water is filled in the shaft, the wall of the shaft is drilled with a cutter disk, and jet water is injected from a plurality of water injection ports provided on an outer peripheral portion of the cutter disk. Digging while scattering concrete powder, and stopping the shield machine when the front end of the skin plate of the shield machine reaches the shaft, then expanding the flexible plate-shaped annular body built in the outer periphery of the skin plate to form the skin plate. A method of stopping water at a reaching portion in a shield method, wherein a gap between the shaft and a shaft of a shaft is sealed, and the gap is filled with a waterproof material. 2. An annular groove having an inverted T-shaped cross section engraved on the outer periphery of a portion of the skin plate of the shield machine close to the cutter disk, a water injection pipe opening at the bottom of the T-shaped cross section, A first flexible plate-like annular body having both ends fastened to both ends, and a second flexible plate-like annular body having one edge fastened to an end of the bottom at the side of the cutter disc; And a water-stopping material injection pipe that is opened on the outer periphery of the skin plate on the side facing the cutter disk of the annular groove.