JPH1150794A - Tail seal structure of shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cut-off of water by providing a wire brush on the inside of a tail part of a skin plate of a shield machine, and injecting foam resin in the inside of the wire brush to seal the wire brush. SOLUTION: A wire brush seal 13 clamps both sides of a wire brush 15 with a flexible outer protective plate 17 and an inside protective plate 19, and foam resin is injected into the wire part of the wire brush 15. Impermeable films 18a, 18b, 18c are formed between the foam resin of the wire brush 15 and the outer protective plate 17. In a shield machine, the wire brush seal 13 seals between a tail plate 9 and a segment 11, thereby preventing external fluid from entering the inside of the shield machine, and simultaneously excavation in the direction of advance is continued. At this time, water which has passed through the foam resin can be intercepted by the impermeable film 18 so as to improve cut-off efficiency. Accordingly, a tail seal structure of a shield machine having favorable cut-off efficiency can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Generally, a wire brush type tail seal filled with tail seal grease is often used as a tail seal of a shield machine. In this wire brush type tail seal, the backing material may penetrate and solidify in the seal, causing water leakage or breakage. For this reason, the present applicant has filed a patent application for a tail seal structure of a shield machine in which a sealing resin is previously filled with a foamed resin (Japanese Patent Application No. 7-23950).
No. 4).

[0003]

Experiments have confirmed that a wire brush type tail seal filled with a foamed resin has a smaller amount of water leakage than a conventional tail seal because no backing material enters the seal. It has been adopted in actual construction. However, since it is a foamed resin in consideration of elasticity, there are some places where the foam in the resin is not completely independent, and there are places where muddy water is removed by a seal and water comes out. Although there is no problem with the construction as it is, precision machinery may be used for the shield machine for automatic assembly of segments,
More water stoppage may be required. The present invention
The present invention has been made in view of such a problem, and an object of the present invention is to provide a tail seal structure of a shield machine having good water stoppage.

[0004]

In order to achieve the above-mentioned object, the present invention provides a tail seal structure for sealing a tail part of a shield machine, wherein a wire brush is provided inside a tail part of a skin plate of the shield machine. A tail seal structure for a shield machine, wherein a foamed resin is injected into the inside of the wire brush to form a wire brush seal.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a schematic configuration of a shield machine 1 according to the present embodiment. Excavation of the ground 5 is performed by the cutter 3 on the front surface of the shield machine 1, and a segment 11 is assembled on the inner surface of the tail plate 9 behind the skin plate 7. To promote.

[0006] A tail plate B behind the shield machine 1 has a skin plate 7 and a tail plate 9 and a segment 1.
Underground water, muddy water, backing material, etc. from between
A wire brush seal 13 is provided annularly around the entire inner surface of the tail plate 9 in order to prevent the wire brush from entering the inside.

Next, the wire brush seal 13 will be described. FIG. 2 is an enlarged view of a portion B in FIG. 1 and shows the structure of the wire brush seal 13 and the peripheral structure in detail in a cross-sectional view. FIG. The wire brush seal 13 is formed by sandwiching both sides of a wire brush 15 between a flexible outer protection plate 17 and an inner protection plate 19 and injecting a foam resin into a wire portion of the wire brush 15.

[0008] Water-impermeable membranes 18a, 18b, 18c are formed between the foamed resin of the wire brush 15 and the outer protective plate 17. Examples of the material of the water-impermeable membrane include a rubber-like elastic polymer such as polyurethane rubber, acrylic resin, and silicone rubber. The base plate 21 covers the entire base portion of the outer protection plate 17 and the inner protection plate 19. This base plate 21 is attached to the inner surface of the tail plate 9 with rivets 23. 25 is a protection ring.

[0009] Three rows of annular wire brushes 15a, 15
b and 15c constitute the wire brush seal 13 as a whole. In a portion of the wire brush 15c behind the outer protection plate 17, a backing material 27 such as mortar is injected between the ground 5 and the segment 11. Ground 5 and Segment 1
In addition to the backing material 27, there is an external fluid such as muddy water or groundwater between the first and second wire brushes 15. The animals also have the second row and the first row of wire brushes 15b and 15a.
And does not enter the inside of the shield machine 1.

In the shield machine 1, the wire brush seal 1
At 3, the excavation in the excavation direction A is continued while sealing between the tail plate 9 and the segment 11 so as to prevent the external fluid from entering the inside of the shield machine 1. Although the shield machine 1 may return in the direction opposite to the excavation direction A due to the backing, the wire brush seal 13 is flexible and can cope without breakage. In the present embodiment, the water that has passed through the foamed resin can also be blocked by the water-impermeable membrane 18, so that the water stopping performance is improved.

[0011]

As described above in detail, according to the present invention, it is possible to provide a tail seal structure of a shield machine having good water stoppage.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of a shield machine 1.

FIG. 2 is an enlarged view of a portion B in FIG. 1;

FIG. 3 is a partial development view showing the arrangement of the wire brush seal 13;

[Explanation of symbols]

 1 Shielding machine 3 Cutter 5 Chichi 7 Skin plate 9 Tail plate 11 Segment 13 Wire brush seal 15 Wire brush 17 ...... Outer protective plate 18 Non-permeable membrane 19 Inner protective plate 21 Base plate 23 Rivets 25 Protective ring 27 Backing material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Imagawa 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Inside Kashima Construction Co., Ltd. (72) Inventor Hiroshi Ishimaru 1-3-8 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Hiromasa Igarashi 2-9-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. No. 7 Inside Kashima Construction Co., Ltd. (72) Inventor Katsumi Inomata 1-3-8 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. Tokyo Branch 4-1 Tokyo Town Electric Power Research Institute (72) Inventor Takeshi Ariizumi 4-1 Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Tokyo Electric Power Company

Claims (2)

[Claims] In a tail seal structure for sealing a tail portion of a shield machine, a wire brush is provided inside a tail portion of a skin plate of the shield machine so as to be sandwiched between an inner protection plate and an outer protection plate. While injecting foam resin inside,
A tail seal structure for a shield machine, wherein a water-impermeable membrane is provided between the foamed resin and the outer protective plate. 2. The water-impermeable membrane comprises a polyurethane rubber,
2. The tail seal structure of a shield machine according to claim 1, wherein the tail seal structure is made of acrylic resin or silicon rubber.