JPH0642288A - Advancing method for shield machine by water sealing and pressure application in arrival shaft - Google Patents

Abstract

PURPOSE:To prevent excavated earth and sand from flowing out when a shield machine arrives at and drives to an arrival shaft. CONSTITUTION:When a shield machine 1 arrives at an arrival shaft A, a mirror portion 3a is bored on the wall of the shaft. A water stop steel plate ring 4 and an entrance rubber gasket 5 are mounted to the peripheral edged entrance of the mirror portion 3a. A preliminarily made arrival box-shaped body 6, which is slightly larger than the shield machine 1 and provides a water injection pipe 7 and a wire rope insertion pipe 8, is tightly connected to the gasket 5. Before the shield machine 1 is shield-propelled, the box-shaped body 6 is water- sealed and pressurized and the shield machine 1 is launched. At the same time, a wire rope 9 inserted into the wire rope insertion pipe 8 is tensed. After the gasket 5 is pressure-welded to the outer periphery of a segment to be connected to the shield machine 1 and water-stopped, the shield machine 1 and the arrival box-shaped body 6 are pulled up and removed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a shield construction method,
The present invention relates to a propulsion method by pressurizing a water seal of a shield machine, which prevents water and earth and sand from flowing out when the shield machine reaches a reaching shaft.

[0002]

2. Description of the Related Art Conventionally, an entrance packing is attached to a reaching wellhead, a steel sheet pile of a mirror portion is cut and removed, and then a shield machine is propelled.

[0003]

In the above method, when the shield machine moves, the surrounding ground is disturbed, water and sediment flow out, and water and sediment flow out until the shield machine enters the entrance packing. Continuing, it is easy to cause the depression of the ground surface. The present invention has been proposed in view of the above problems of the prior art, the objective is to reach a vertical shaft shield machine, in the reaching shaft that prevents the outflow of sediment and water when propelling The point is to provide a propulsion method by pressurizing the water seal of the shield machine.

[0004]

In order to achieve the above-mentioned object, according to the propulsion method of the shield machine by the water-sealing pressure according to the present invention, when the shield machine reaches the reaching shaft, the shield machine penetrates. The mirror part is excavated on the shaft wall, and a water stop ring and packing are attached to the peripheral entrance part of the mirror part. It is slightly larger than the prefabricated shield machine and a wire for tightening the water injection port and entrance packing. Attaching a reachable body with a rope insertion tube to the packing, before the propulsion of the shield machine, after pouring a stabilizing solution into the body through the water injection port to pressurize the body with water, Start the shield machine and penetrate the shaft wall,
The wire rope is tensioned, the packing is pressure-bonded to the segment portion following the shield machine to stop water, and then the shield machine and the body are removed.

[0005]

According to the present invention, as described above, a reaching body which is larger than the propulsion unit is attached to the peripheral entrance packing of the mirror portion in the reaching shaft, and the advancing body is inserted through the water injection port prior to the propulsion of the shield machine. Inject a stabilizing solution with water to press against the groundwater pressure against the groundwater pressure, and then start the shield machine from the mirror into the reaching body, and insert it into the wire rope insertion tube of the reaching body. After the entrance packing is pressed through the wire rope to the segment assembled to the rear of the shield machine to stop water, the shield machine and the reaching body are removed.

[0006]

The present invention will be described below with reference to the illustrated embodiments. Reference numeral 1 is a shield machine, 2 is a segment assembled behind the shield machine 1 as it is dug, and 3 is a reach shaft A.
Shield machine 1 reached a shaft A with steel sheet piles installed on the surrounding wall
Before arriving at, the mirror part through which the shield machine 1 penetrates is excavated, and a steel plate ring 4 for water stoppage is provided at the entrance part around the mirror part.
Also, the entrance packing 5 is attached, and the packing 5 prevents the outflow of water and earth and sand from the ground when the shield machine 1 enters the reaching shaft A.

Reference numeral 6 is a reachable body slightly larger than the prefabricated shield machine 1, which is provided with a water injection pipe 7 and a wire rope insertion pipe 8 through which a tightening wire rope 9 is inserted. In the figure, 3a is a mirror portion where the steel sheet pile 3 is cut open, 10 is excavated soil generated during the cutting, and 11 is a pedestal for the box body 6. The wire rope 9 is inserted into the wire rope insertion tube 8, is wound around the entrance rubber packing 5, and is tensioned by a tensioner connected to the upper portion of the wire rope 9.

In the figure, 12 is a valve, 13 is a monitoring hole, 14 is a door for opening and closing a working hole, 15 is a stabilizing solution, and 16 is an underwater electric bulb. 4 to 9 show steps of the method of the present invention. Before the shield machine 1 reaches the reaching shaft A (see FIG. 4), the mirror portion 3a of the steel sheet pile 3 through which the shield machine 1 penetrates is excavated, (See FIG. 5) The reaching body 6 that communicates with the mirror portion 3a is arranged in the vertical shaft A, and the wire rope 9 inserted into the wire rope insertion tube 8 is wound around the entrance rubber packing 5 (see FIG. 6). Connect the upper end to a tensioner (not shown),
A stable liquid 15 such as bentonite muddy water is injected under pressure into the body 6 to counteract the groundwater pressure (see FIG. 7), and the shield machine 1 is launched into the body 6 to tension the wire rope 9. After the packing 5 is pressure-bonded to the segment 2 to stop water, (see FIG. 8) the shield machine 1 and the body 6
Withdraw.

FIG. 10 shows a state where the shield machine 1 reaches the reaching shaft A at a steep inclination, and FIG. 11 shows a case where the shield machine 1 is propelled to the reaching body 6 at that time.
Shows a state in which the shield machine 1 has reached the ultra-depth reach shaft, and FIG. 13 shows a state in which the shield machine 1 has propelled the reach body 6 at this time.

[0010]

As described above, according to the present invention, when the shield machine arrives at the reaching shaft, water is injected into the reaching body installed in a watertight manner at the entrance of the shaft, and water pressure against groundwater pressure is applied, By propelling the shield machine inside the body, stopping the segment part following the shield machine, and lifting the shield machine together with the reaching body, prevent the outflow of soil and water that occurs when the shield machine propels. To do.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state of implementation of a propulsion method by water-sealing pressurization of a shield machine in a reaching shaft according to the present invention.

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a perspective view of a reaching body.

4 (a) and (b) are vertical sectional views as well as a horizontal sectional view showing a state immediately before the shield machine reaches the reaching shaft.

5 (a) and (b) are vertical sectional views as well as a horizontal sectional view showing a state in which the mirror portion of the vertical shaft is opened and cut.

6A and 6B are a vertical sectional view and a plan sectional view showing a state in which the reaching body is mounted on the shield machine.

7 (a) and 7 (b) are vertical cross-sectional views along with a plan cross-sectional view showing a state in which a stabilizing solution is filled in the body.

8 (a) and (b) are vertical sectional views as well as a horizontal sectional view showing a state in which the segments subsequent to the shield machine are water tightly tightened.

9A and 9B are a vertical sectional view and a horizontal sectional view showing a final step, respectively.

FIG. 10 is a plan sectional view showing a state in which the shield machine reaches the reaching shaft at a steep angle.

FIG. 11 is a plan sectional view showing a state in which the shield machine is propelled into a vertical shaft.

12 (a) and 12 (b) are vertical cross-sectional views as well as a horizontal cross-sectional view showing how the shield machine reaches the ultra-deep shaft.

13 (a) and 13 (b) are vertical sectional views as well as a horizontal sectional view showing a state where the shield machine is propelled into the ultra-deep shaft.

[Explanation of symbols]

 1 Shielding Machine 2 Segment 3 Steel Sheet Pile 3a Mirror 4 Steel Plate Ring for Water Stop 5 Entrance Rubber Packing 6 Reaching Body 7 Water Injection Pipe 8 Wire Rope Insertion Pipe 9 Wire Rope 10 Excavated Soil 11 Cradle 12 Valve 13 Monitoring Hole 14 Working Hole Opening / closing door 15 Stabilizer 16 Underwater light bulb A Reaching shaft

Claims (2)

[Claims] 1. When the shield machine reaches the reaching shaft,
The mirror part that the shield machine penetrates is excavated on the shaft wall, and a water stop ring and packing are attached to the peripheral entrance part of the mirror part, which is slightly larger than the prefabricated shield machine and the water injection port and entrance packing. An reaching body equipped with a wire rope insertion tube for tightening is attached to the packing, and a stabilizing solution is injected into the body via the water injection port before the shield machine is propelled to add water to the body. After pressing, the shield machine is started, the shaft wall is penetrated, and the wire lobe is tensioned to press the packing to the segment portion subsequent to the shield machine to stop the water, and then the shield machine and the shield. A method for propelling a shield machine by water-sealing pressure in a reaching shaft, which comprises removing the body. 2. The propulsion method by pressurizing the shield machine with a water seal in the reaching shaft according to claim 1, wherein the shield body is provided with a hole for monitoring the propulsion state of the shield machine and an opening / closing door for work inside the shield machine.