JPH08218783A - Shield machine Tail seal replacement method - Google Patents

Abstract

(57) [Summary] [Purpose] Inspect and replace the tail seal without the need for ground improvement. [Structure] The rubber seal (1) mounted in the groove (11) of the segment (10) is pressurized and swelled with water to seal between the shield machine outer cylinder (15) and the ground, and then the segment (15A) Disassemble and inspect and replace the tail seals (16, 17).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine tail seal replacement method.

[0002]

2. Description of the Related Art In the shield construction method, in order to prevent infiltration of groundwater, earth and sand and backfill material into the shield machine,
A tail seal is attached to the rear end of the shield machine. As the construction of the tail seal progresses, the tail seal is chipped or worn, and the sealing performance deteriorates. Therefore, it is necessary to inspect and replace the tail seal. Conventionally, this inspection and replacement work has been performed after the ground around the ground has been improved to prevent the inflow of groundwater and earth and sand into the machine.

[0003]

The method of inspecting and replacing the tail seal after the conventional ground improvement has a problem in that much cost and time are required.

It is an object of the present invention to provide a shield machine tail seal replacement method which does not require ground improvement or the like.

[0005]

According to the present invention, after the seal body provided on the outer circumference of the segment or the inner circumference of the outer casing of the shield machine is pressurized and bulges to stop the water between the shield machine and the ground, It is characterized in that the tail seal is replaced by disassembling the segment where the replaced tail seal is in contact in the shield machine.

[0006]

In the present invention, since the seal body is bulged to stop the water between the shield machine and the ground, the tail seal can be inspected and replaced without the conventional ground improvement.

[0007]

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

1 to 5 show a rubber seal 1 which is a seal body embodying the present invention. The rubber seal 1 has an arcuate side surface and an inverted U-shaped cross section, and has an arcuate recess 2 formed therein.
A plurality of inverted U-shaped reinforcing metal fittings 4 are embedded inside the rubber seal 1.

The rubber seal 1 is housed in a circumferential groove portion 11 formed on the outer circumference of the segment 10, and a pressurizing port 12 communicating with the recess 2 of the rubber seal 1 is formed on the inner circumference of the segment 10. ing.

In FIG. 5, the segment 10 is divided into a plurality of (seven in the illustrated example) pieces 10a to 10g,
Rubber seals 1a to 1g are provided for each of the pieces 10a to 10g, and both end surfaces 3 of the recess 2 are brought into contact with each other at the time of setting and closely contacted when the rubber seal 1 swells.

Next, the manner of inspecting and replacing the tail seal will be described with reference to FIGS.

First, as shown in FIG. 6, a segment 10 in which the rubber seal 1 is set is assembled and excavated, and then the next normal segment 10A is assembled, and the rubber seal 1 has three stages of tail seals 16 and 17 in the illustrated example. , 18 until it is located between the second-stage tail seal 17 and the third-stage tail seal 18.

Next, as shown in FIG. 7, water or the like is injected into the groove 11 from the pressurizing port 12, the rubber seal 1 is bulged and brought into close contact with the outer casing 15 of the shield machine, and ground water or earth and sand flow into the shield machine. Prevent from doing. At this time, the reinforcing metal fitting 4 is
It is widened toward the end to improve the adhesion at the time of attachment to the segment and prevent the rubber seal 1 from being deformed by high pressure. Further, in FIG. 5, rubber seals 1a to 1
g extends in the circumferential direction, and both end faces 3 are in close contact with each other to seal groundwater and earth and sand.

Next, as shown in FIG. 8, the normal segment 10A is disassembled.

Then, as shown in FIG. 9, the tail seals 16 and 17 are inspected and, if necessary, replaced, and then the normal segment 10A is reassembled and finished.

FIGS. 10 and 11 show a tube seal 5 which is another seal body for carrying out the present invention.
Two protrusions 5a having a triangular cross section are provided on the contact surface of the tube seal 5 with the segment 10A, and a strip-shaped reinforcing metal member 6 for reinforcing lateral rigidity is embedded inside. Then, it is attached to the shield machine outer cylinder 15A by the attachment fittings 8 and the attachment bolts 9, and the pressure tube 7 is provided. In this embodiment, water or the like is injected from the pressurizing tube 7 to pressurize it, expands into a chain line shape 5A and makes close contact with the segment 10A, and prevents groundwater or earth and sand from flowing into the shield machine. At this time, the protrusions 5a follow the steps of the segment 10A and the adhesion of foreign matter to secure the adhesion. Further, the reinforcing metal member 6 ensures the adhesiveness with the segment 10A even if the tube seal 5 is deformed by high pressure. Reference numeral 20 in the figure is a holding metal fitting.

Next, the front segment 10A is disassembled, and the tail seals 16 and 17 are inspected and replaced.

[0018]

As described above, according to the present invention, the tail seal can be easily inspected and replaced without improving the ground, and the workability can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a segment to which a rubber seal for carrying out the present invention is attached.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view of a rubber seal.

FIG. 4 is a side view of FIG.

FIG. 5 is a front view of a segment to which a rubber seal is attached.

FIG. 6 is a side sectional view for explaining a digging stop step.

FIG. 7 is a side sectional view illustrating a pressurizing step.

FIG. 8 is a side sectional view illustrating a segment disassembly process.

FIG. 9 is a side sectional view for explaining a tail seal inspection and replacement process.

FIG. 10 is a side sectional view showing a shield machine outer cylinder to which a tube seal for carrying out the present invention is attached.

FIG. 11 is a side sectional view for explaining a digging stop step.

[Explanation of Codes] 1, 1a to 1g ... Rubber seal 2 ... Recessed portion 3 ... End surface 4 ... Reinforcing metal fitting 5 ... Tube seal 5a ... Ridge 6 ... Reinforcing metal fitting 7. ..Pressure tube 8 ... Mounting metal fitting 9 ... Mounting bolt 10,10A ... Segment 10a to 10g ... Piece 11 ... Groove 12 ... Pressure port 15 ... Outside of shield machine Cylinder 16, 17, 18 ... Tail seal

Front page continuation (72) Inventor Soichiro Ueda 9-30 Wakamatsucho, Nagata-ku, Kobe, Hyogo Prefecture Rokuryo Rubber Co., Ltd. Kobe factory

Claims (1)

[Claims] 1. A sealed body provided on the outer circumference of a segment or the inner circumference of a shield machine outer cylinder is pressurized and swelled to stop water between the shield machine and the ground, and then a tail seal to be exchanged abuts in the shield machine. A tail seal replacement method for shield machines, characterized by disassembling the existing segment and replacing the tail seal.