JPH0735920Y2 - Water stop structure at segment corner - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a segment corner portion in a shield construction method which is a basic construction method mainly for forming a circular tunnel.

2. Description of the Related Art Generally, in a shield construction method, a large number of prefabricated segments are joined together by bolts, pins or knuckles to assemble a cylinder or other shaped shield structure. At this time, various measures for stopping water are taken to prevent groundwater from leaking from the joints between the segments. For example, a method of injecting backfilling liquid into the gap between the segment and the ground to solidify it to prevent groundwater from entering, a method of applying a caulking material such as epoxy putty to the joint between the segments, an elastic rubber seal on the segment,
A method is known in which an unvulcanized pressure-sensitive adhesive rubber is applied and water is stopped by its restoring force and adhesive force, and a combination thereof. However, with such a method, complete water stop cannot be realized because the expansion and contraction and fluctuation of the building are large.

Therefore, in recent years, as a method for improving these, a method of attaching a water-expandable elastic rubber seal material to a segment and stopping water is rapidly spreading due to its effect and reliability.
As shown in FIG. 4, L-shaped corner packings 11a and 11b made of water-expandable rubber are used for the segment A as a water-stop structure adopted in the method of attaching such a water-expandable elastic rubber seal material to the segment. , And B, there is a water stop structure of the segment corner part that is installed at the corner of the segment in the joint part (actual Kaihei 1
-93297).

[0003]

However, in the conventional water shut-off structure shown in FIG. 4, the corner packing 11a is formed at the connecting portion between the seal members 12, 12, ... After assembling the segments A, B, C. , 11b having the same length on one side, it was observed that water leakage occurs from the portion 13 where the joints overlap (or the portion where the joints are continuous) 13. The present invention is proposed to solve the above problems,
Even at the connection part of the sealing material after segment assembly,
The present invention provides a water-stop structure for segment corners that prevents water leakage as much as possible.

[0004]

DISCLOSURE OF THE INVENTION The present invention comprises a water-expandable rubber in a water-stop structure of a segment corner portion for water-stopping a T-shaped joint portion formed by combining substantially block-shaped segments. A pair of L-shaped corner packings 1a and 1b are mounted back to back on the T-shaped joint portion, and the pair of corner packings 1a and 1b are attached to each other.
By proposing a waterproof structure for segment corners, characterized in that a pair of corner packings 1a, 1b are formed so that the lengths of sides of a and the corner packing 1b that contact each other are different. Has been achieved. As the water-swellable rubber forming the corner packing used in the present invention, a water-swellable polyurethane resin carrier or a water-swellable polyurethane-containing flexible material composed of a mixture of the same and a natural rubber, a synthetic rubber, or a recycled rubber, or Examples thereof include water-swelling rubber obtained by kneading a superabsorbent resin such as carboxylic acid into the above rubber.

[0005]

According to the waterproof structure of the segment corner portion according to the present invention, when the lengths of the sides where the corner packings 1a and 1b contact each other are different from each other, the seam of the sealing material provided in the joint portion of the segment is They do not overlap and water leakage in this part is hardly seen. For this reason, the construction material of the shield construction method configured as described above has excellent waterproofness as a whole.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a water stop structure of a segment corner portion of the present invention will be explained based on an embodiment shown in the drawings. Figure 1
FIG. 2 is a perspective view of a construction material of a segment having a water blocking structure of the present invention, and FIG. 2 is a side view of a main part of a segment joint portion of a segment corner portion showing the water blocking structure of the present invention.

As shown in FIGS. 1 and 2, a T formed by combining substantially block-shaped segments A, B and C with each other.
As for the water-stop structure of the segment corner portion for stopping the water in the V-shaped joint, each segment is assembled in the same manner as the conventional water-stop structure shown in FIG. In the waterproof structure of the segment corner portion of the present invention, a pair of L-shaped corner packings 1a and 1b made of water-expandable rubber are attached to the T-shaped joint portion 2 with their backs facing each other. The pair of corner packings 1a and 1b are formed such that the pair of corner packings 1a and 1b have mutually different sides in contact with each other.

The embodiment of the present invention will be further described. As shown in FIG. 2, a segment A having a groove formed on its side surface is used, and an L-shaped segment made of water-expandable rubber at a corner portion of the segment A. One shaped corner packing 1a
The corner packing 1b is also mounted on the segment B opposite to the segment A in exactly the same manner. At this time, the corner packings 1a and 1b are back-to-back with each other and have mutually different sides.

A water-expandable sealing material 3 is attached in the groove following both ends of the corner packing 1a, and the same applies to the segment B to which the corner packing 1b is attached. Further, the water-expandable sealing material 3 is also attached to the joint surface between the segment A and the segment B in the segment C which constitutes the joint portion together with the segments A and B.

The corner packings 1a, 1 of the embodiment
b and water-swellable sealant 3 segments A, B, or attached to C, and to or joining corner packing 1a, and 1b and water swellable sealing material 3, rubber-based adhesives, rapid contact
To wear agents may be used. Further, the length of the corner packing of the present invention may be such that it substantially covers the segment corner portion, but in order to improve the adhesiveness, the length of one side is at least 50 mm or more. Is preferred. Also, the difference in length between the corner packings 1a and 1b is 20
It is desirable that it is mm or more.

(Test Evaluation) Next, the test results conducted to test the effect of the present invention will be described. As a test method, a simulated water pressure resistance tester shown in FIG. 4 was used. The corner packings 1a and 1b having a width of 36 mm and a thickness of 8 mm and the water-expandable sealing material 3 were attached and cured in a seal groove having a groove depth of 5 mm. At this time, the length of the side of the corner packing 1a in contact with the corner packing 1b was shortened by 30 mm. The spacer 4 was engaged so that the gap between the left and right side blocks 8 and the gap between the upper plate 7 and the side block 8 were 5 mm, and the tester was assembled. Water pressure of 5 (kgf / cm ² ) was applied from the water pipe 5 on the upper part of the tester, and it was confirmed that there was no water leak. In addition, as a comparative example, the same water pressure resistance test was conducted using the above water-expansion sealant and making the length of the corner packing 1a in contact with the corner packing 1b the same. The test results are shown in Table 1.

[0012]

[Table 1] Results of water pressure resistance test

As described above, according to the water blocking structure of the present invention, since the joint between the corner packing and the water-expandable sealing material that follows the corner packing does not overlap, the risk of water leakage from this portion is extremely small.

[0014]

[Effects of the Invention] In the waterproof structure of the segment corner portion of the present invention, a water-expandable rubber material is formed into an L-shape in conformity with the corner portion of the segment to facilitate the construction at the site and remove the water-expandable substance. In addition to ensuring waterproofness by using it, the length of one side of the L-shaped corner packing is changed to completely prevent water leakage from the corner part, which is extremely practical. Very expensive.

[Brief description of drawings]

FIG. 1 is a perspective view of a circular tunnel-shaped building material to which a water stop structure of a segment corner portion according to the present invention is applied.

FIG. 2 is a side view of an essential part showing an embodiment of a water stop structure for a segment corner according to the present invention.

FIG. 3 is an exploded perspective view of a water pressure resistance tester used in a test conducted to test the effect of the present invention.

FIG. 4 is a side view of an essential part showing an example of a conventional waterproof structure of a segment corner portion.

[Explanation of symbols]

 1a, 1b Corner packing 2 Segment joint 3 Water-expandable sealing material 4 Spacer 5 Water pipe 6 Pressure gauge 7 Upper plate 8 Side block A, B, C segment

Front page continuation (71) Applicant 390019655 Nippon Seal Pack Co., Ltd. 3-19-2 Nihonbashihamacho, Chuo-ku, Tokyo Hasebe No. 5 Building (71) Applicant 000005278 Bridgestone Co., Ltd. 1-10-1 Kyobashi, Chuo-ku, Tokyo No. (71) Applicant 000006714 Yokohama Rubber Co., Ltd. 5-36-11 Shimbashi, Minato-ku, Tokyo (72) Creator Koji Hara 7-35 Higashiohisa 3-chome, Arakawa-ku, Tokyo Within Asahi Denka Co., Ltd. (72) Inventor Kimio Miura 11-1 Hitotino-Honcho, Higashiyama-ku, Kyoto Prefecture, Kyoto Sanyo Kasei Kogyo Co., Ltd. (72) Inventor Michiyoshi Terauchi 3-1-22 Atago, Ageo City, Saitama Pref. Yutaka Kobayashi 543-16 Kitano-cho, Hachioji-shi, Tokyo (72) Inventor Hisao Motomura 8-14-48 Minamihira, Hino-shi, Tokyo (72) Inventor Keiji Nitta 6-2-304 (Minami-rikan, Kanagawa Prefecture) 72) Inventor Wataru Ota 6218-11 Okazaki, Hiratsuka City, Kanagawa Prefecture (56) References: 1-93297 (JP, ) JitsuHiraku flat 1-102298 (JP, U) JitsuHiraku Akira 61-106600 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A water-stop structure of a segment corner part for stopping water at a T-shaped joint part formed by combining substantially block-shaped segments, and a pair of L-shaped corners made of water-expandable rubber. The packings 1a and 1b are attached back to back to each other in the T-shaped joint portion, and the pair of corner packings 1a and 1 are provided.
A waterproof structure for a segment corner portion, characterized in that a pair of corner packings 1a, 1b are formed so that the lengths of the sides contacting with b are different.