JPH06109140A - Sealing material for shield segment - Google Patents

Abstract

PURPOSE:To provide a sealing material for shield segment which is not damaged in assembling the shield segment and is excellent in the sealability. CONSTITUTION:A sealing material is affixed to one of the abutting end surfaces of adjacent shield segments 10, 20, and is interposed between the assembled shield segments 10, 20. The surface to slide the shield segment at least during the assembly among the side surfaces of a seal body part 30 composed of the water-swollen rubber is surrounded and protected by a protective part 40 made of the thermoplastic resin which is as high as the seal body part 30 and has higher strength than that of the seal body part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal material for a shield segment which is not damaged even when the corners of the shield segment are hit when assembled.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS. Conventionally, a rubber seal material having a rectangular parallelepiped cross section, such as water-expandable rubber, butyl rubber, sponge rubber, is attached to one of the abutting end faces 11 and 21 of the adjacent shield segments 10 and 20. In associating and assembling 10, 20 with each other, the end surface 21 of the segment 20 to which the sealing material is not attached is slid with respect to the end surface 11 of the segment 10 to which the sealing material 50 is attached.

However, the conventional sealing material 50 described above is used.
When the shield segment is assembled, the corner of the shield segment 20 hits the seal material 50, and as shown in FIG. 2, the seal material 50 is damaged and the seal becomes incomplete.

[0004]

The problem to be solved by the invention is that in the conventional seal material 50, when the shield segment is assembled, the corner of the shield segment 20 hits the seal material 50, and the seal material 50 is damaged. The seal is incomplete.

[0005]

A means for solving the problems will be described with reference to FIGS. The present invention relates to adjacent shield segments 1
At least one of the side surfaces of the seal main body portion 30 made of a water expander, which is a sealing material for a shield segment and is interposed between both shield segments 10 and 20 attached to one of the butt end surfaces 11 and 21 of 0 and 20 and assembled. , The surface that slides the shield segment during assembly,
Surrounded by a protective portion 40 made of a thermoplastic resin having the same height as the seal body portion 30 and higher strength,
It is protected. In addition, as shown in FIG. 4, it is preferable that the water-expandable body 31 made of the same material as the seal body is also provided on the surface to be attached to the shield segment.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining an embodiment, reference numerals 10 and 20 are adjacent shield segments, and their abutting end faces 1
A sealing material attached to the end face 11 is interposed between the first and second parts 21 to seal them. The sealing material is constructed as follows. That is, 30 is a seal main body portion made of water-expanded rubber, 40 is a protective portion that surrounds and protects the side surface of the seal main body portion 30, and is at the same height as the seal main body portion 30 (flush with the seal surface), And it is made of a thermoplastic resin having higher strength. More strictly speaking, the butt end surface 21 of the other shield segment 20 to which the seal material is not attached is slid along the end surface 11 of the one shield segment 10 to which the seal material is attached, and the other shield segment is attached. In order to prevent the corners of 20 from hitting the seal body portion 30, the protective portion 40 is
It may be provided on a side surface perpendicular to the sliding direction. Also,
When the shield segment 20 is slid, the protective portion 40 is formed in the seal body portion 3 so that its corners are not touched as much as possible.
The height is lowered as it goes away from zero. In addition,
Considering the attachment to the vertical end surface 11 of the shield segment 10 and the adhesiveness to the shield segment 10, the material of the protective portion 40 is vinyl chloride having a JISA hardness of 70 or more (rubber / heat Any of a plastic elastomer and a thermosetting resin may be used), and the seal body portion 30 is preferably a sponge body having a small specific gravity. The water expansion body is water expansion rubber, water expansion resin, water expansion elastomer, or the like.

In the production of the present sealing material, one is a method of separately molding the seal main body portion 30 and the protective portion 40 and then assembling, and the other is a molding of ultra-high molecular weight polyethylene or water-crosslinked polyethylene. Another method is to vulcanize the rubber after simultaneously extruding the protective portion 40 made of a body and the seal body portion 30 made of a water expansion body.

In operation, the seal body portion 30 is surrounded and protected by the protection portion 40, and along the end surface 11 of the shield segment 10 to which the seal material is attached, the shield segment 20 to which the seal material is not attached is provided. When the butt end surface 21 is slid and assembled, the corners of the shield segment 20 do not directly hit the seal body portion 30 and the seal body portion 30 is not damaged, and the sealability is completely maintained. Further, since the protection part restricts the expansion of the seal body part, the expansion force of the seal body part is concentrated in the height direction, and a higher sealing pressure can be obtained as compared with the structure without restriction.

[0009]

Since the present invention is constructed as described above,
The sealing material will not be damaged when the shield segments 10 and 20 are assembled, and the sealing performance will not be impaired.

[Brief description of drawings]

FIG. 1 is a side view showing a state before assembly of a conventional example.

FIG. 2 is a side view showing a state after assembly of a conventional example.

FIG. 3 is a sectional view showing an embodiment of the present invention.

FIG. 4 is a sectional view showing a modified example of FIG.

FIG. 5 is a perspective view showing an embodiment of the present invention.

FIG. 6 is a side view showing a state before assembly according to an embodiment of the present invention.

FIG. 7 is a side view showing a state after assembling of the embodiment of the present invention.

[Explanation of symbols]

 10, 20 Shield segment 11, 21 End face 30 Seal main body part 31 Water expansion body 40 Protective part 50 Sealing material

Claims (1)

[Claims] 1. Adjacent shield segments (10, 2)
In the shield material for the shield segment, which is affixed to one of the abutting end faces (11, 21) of (0) and interposed between the assembled shield segments (10, 20), the side surface of the seal body portion (30) made of a water expander is used. At least, at the time of assembling, at least the surface on which the shield segment slides should be protected by enclosing it with a protective portion (40) made of a thermoplastic resin having the same height as and higher than the seal body portion (30). Sealing material for shield segment