JP4282174B2 - Method for forming water-swellable rubber seal material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for molding a water-swellable rubber seal material applied to a seal groove having a curved portion in a plane on at least one joint surface of a segment having a joint surface composed of a piece surface and a ring surface for constructing a shield tunnel. Is.
[0002]
[Prior art]
The segments that make up the shield tunnel are fixedly connected to the piece surface and ring surface with a connecting bracket, but depending on the type of connecting bracket, the seal groove may not be provided near the inside of the tunnel. A seal groove having a bent portion in a plane is provided so as to avoid the portion.
Thus, as a sealing material used for a segment in which the sealing groove has a curved portion in a plane, conventionally, a portion corresponding to the planar curved portion is formed by press molding and joined to a linear portion, A straight portion was installed in the mold, and a flat bent portion was used in which an unvulcanized water-expandable rubber material was added and integrated by hot press molding.
[0003]
[Problems to be solved by the invention]
In the above-described method, a non-water-swellable material that serves as a reinforcing layer for a water-swellable rubber sealing material having a composite structure made of a water-swellable rubber and a non-water-swellable rubber located at the center in the width direction on the back side. There is a drawback in that the rubber does not have a continuous configuration and the advantages of the composite structure cannot be utilized.
[0004]
OBJECT OF THE INVENTION
In order to solve the above-described problems, an object of the present invention is to provide a method for processing a water-swellable rubber sealing material having a reinforcing layer to which a non-water-swellable rubber is connected even in a planarly bent portion. .
[0005]
[Means for Solving the Problems]
The present invention relates to a method for forming a water-expandable rubber seal material applied to a seal groove having a bent portion in a plane on at least one joint surface of a segment having a joint surface composed of a piece surface and a ring surface constituting a shield tunnel. there are, have a composite structure consisting of a non-aqueous swellable rubber aqueous expandable rubber seal member is positioned in the body portion and the back side width direction center portion of which consists of water swellable rubber, of the water-swellable rubber sealing material and facilities for the processing of the cut-out portion of the V-shape from one end portion in the width direction toward the substantially central portion, subjected to cuts or cutting process from the other end in such a way that state that a substantially central portion is connected, the one of rubber curing adhesive is applied to the cross section of the cutout portion of the V-shaped end, with joining the cross section, unvulcanized water-swellable rubber in the opening of the cuts or cutouts of the other end Rubber Charges filled with heated press and the adhesive was cured, and an unvulcanized rubber material molding method water swellable rubber sealing member having a curved portion, characterized in that to vulcanization.
[0006]
The present invention, on the other hand in such a way that state in which facilities the processing of the cut-out portion of the V-shape toward the substantially central portion from one end portion in the width direction of the water-swellable rubber sealing member, a substantially central portion is connected end subjected to cuts or cutting process from a rubber-based curing adhesive is applied to the cross section of the cutout portion of the V-shape at one end said, joining the cross section, after curing the adhesive by heating the unvulcanized rubber material of the water-swellable rubber was filled into the openings of the cuts or cutouts of the other end, it has a bend, characterized in that for vulcanizing the heated press to unvulcanized rubber material This is a method for forming a water-swellable rubber seal material.
[0007]
Examples of rubber-based curing adhesives used in the present invention include rubber components such as chlorinated natural rubber, chloroprene rubber, chlorosulfonated polyethylene, and polybutadiene rubber, and low-temperature curing agents such as tetramethylthiuram disulfide and tetramethylthiuram monosulfide. And a two-component solvent type comprising a curing agent component such as a phenol resin, a resol resin, or an isocyanate. Among these, the main component is diluted with a solvent such that the chloroprene rubber-based component is 10 to 20% by weight, and the curing agent is diluted with a solvent such that MDI, TDI and the like isocyanate are 10 to 40% by weight. A two-component type is preferred. As such a two-pack type chloroprene rubber / isocyanate-based curing adhesive, various commercially available products can be used. Specifically, a Q-pack manufactured by Yokohama Rubber Co., a Sunpatt S manufactured by Bando Chemical Co., Ltd., Examples include SC2000 manufactured by Chip Top Japan, PANGOFOL HARTER manufactured by Pang, and the like.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The water-swellable rubber seal material used in the present invention is mainly composed of various synthetic rubbers such as chloroprene rubber, styrene / butadiene rubber, isoprene rubber, EPDM rubber, etc., and includes polyacrylic acid, isobutylene / maleic anhydride, One or more of various water expandable resins such as urethane and polyvinyl alcohol are blended, and vulcanizing agents such as metal oxides and sulfur compounds, vulcanization accelerators, fillers, colorants, and softening agents. A water-swellable rubber composition containing various additives such as the above and a non-water-swellable rubber composition obtained by removing the water-swellable resin from the water-swellable rubber composition described above, A composite type manufactured through the process is used.
[0009]
The shape of the composite water-expandable rubber sealing material is such that, as shown in the sealing material A and the sealing material B in FIG. 1, a reinforcing layer made of the non-water-expandable rubber 1 located in the center portion in the width direction on the back side It has a composite structure with a main body portion made of water-expandable rubber 2.
The sealing material A has a flat upper surface, and the sealing material B has two semicircular ridges 3.
[0010]
Next, taking the sealing material A of FIG. 1 as an example, a method for forming a water-swellable rubber sealing material having a bent portion in plan view is shown in FIGS.
In FIG. 2, the sealing material A is a composite structure extruded and then vulcanized, and the cutout portion 5 is processed into a V shape from one end in the width direction to the substantially central portion. In addition, a substantially U-shaped cutout portion 6 is processed from the other end portion so that the substantially central portion is connected, and a cross-section 4 of the cutout portion is formed into a V shape at the one end portion. A two-component type chloroprene rubber / isocyanate-based curing adhesive is applied to each other, and the cross sections are joined together. The rubber material 7 was filled, the adhesive was cured with a hot press, and the unvulcanized rubber material was vulcanized to form a water-expandable rubber seal material having a bent portion.
[0011]
Further, the cutout portion 4 is processed into a V shape that reaches the substantially central portion from one end portion in the width direction of the water-expandable rubber seal material, and the other end is formed so that the substantially central portion is connected. A substantially U-shaped cut-out portion 6 is processed from the portion, and a two-component type chloroprene rubber / isocyanate-based cured adhesive is applied to the cross-section 4 of the cut-out portion in a V-shape at one end thereof. After the adhesive is cured by heating, the uncured rubber material 7 of the water-expandable rubber is filled in the opening 6 of the cut or cut-out portion at the other end, and the unvulcanized rubber is filled with a heating press. A water-expandable rubber seal material having a bent portion may be formed by vulcanizing the material.
[0012]
The shape of the cut-out portion 6 at the other end may be various shapes such as a V shape and a W shape, or may be simply cut with a cutter. A similar product can be formed by filling the vulcanized rubber material 7 and vulcanizing the unvulcanized rubber material with a heating press. Further, a part of the unvulcanized rubber material may be replaced with non-water-expandable rubber.
[0013]
【The invention's effect】
As described above, since the composite structure of the water-expandable rubber seal material is also provided at the bent portion, it can be used as a seal material having a reinforcing effect, and can be used as an adhesive for the cross section of the V-shaped cutout portion. Since a cured adhesive is used, a processing time is short, and a water-swellable rubber seal material having a bent portion that does not impair flexibility and water-swellability can be formed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a water-expandable rubber seal material used in the present invention.
FIG. 2 is a perspective view of a water-expandable rubber seal material in which cutout portions are processed at both ends.
FIG. 3 is a perspective view of a water-expandable rubber seal material having a bent portion formed at the other end portion and filled with an unvulcanized rubber material at the opening of the cutout portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Non-water-expandable rubber 2 ... Water-expandable rubber 3 ... Semi-circular protruding item | line 4 ... Section 5 of the V-shaped cut-out part formed in one edge part ... V-shaped cutout portion 6 formed at one end portion ... U-shaped cutout portion 7 formed at the other end portion ... filled unvulcanized rubber material

Claims (2)

A method for forming a water-expandable rubber seal material applied to a seal groove having a bent portion in a plane on at least one joint surface of a segment that constructs a shield tunnel having a joint surface composed of a piece surface and a ring surface , have a composite structure water swellable rubber seal member is made of a non-aqueous swellable rubber located on the body portion and the back side width direction center portion of which consists of water swellable rubber, one of the width direction of the water-swellable rubber sealing material from the end to facilities the processing of the cut-out portion of the V-shape toward the substantially central portion, subjected to cuts or cutting process from the other end in such a way that state that a substantially central portion is connected, at one end said of the rubber curing adhesive is applied to the cross section of the cutout portion of the V-shaped, with joining the cross section, filled with unvulcanized rubber material in the openings of the cuts or cutouts of the other end, heat press Adhesive is cured, and the molding method of the water-swellable rubber sealing material an unvulcanized rubber material having a curved portion, characterized in that to vulcanized Te. A method for forming a water-expandable rubber seal material applied to a seal groove having a bent portion in a plane on at least one joint surface of a segment that constructs a shield tunnel having a joint surface composed of a piece surface and a ring surface , have a composite structure water swellable rubber seal member is made of a non-aqueous swellable rubber located on the body portion and the back side width direction center portion of which consists of water swellable rubber, one of the width direction of the water-swellable rubber sealing material from the end to facilities the processing of the cut-out portion of the V-shape toward the substantially central portion, subjected to cuts or cutting process from the other end in such a way that state that a substantially central portion is connected, at one end said of the rubber curing adhesive is applied to the cross section of the cutout portion of the V-shape, by joining the cross section, after curing the adhesive by heating, the unvulcanized the opening of the cuts or cutouts of the other end Rubber Molding process of water-swellable rubber sealing member having a curved portion, characterized in that fee was filled, thereby vulcanizing the heated press to unvulcanized rubber material.

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