JP4627729B2 - Joint method for water-stopping material having a hollow valve and water-stopping material - Google Patents

Description

  The present invention relates to a strip-shaped water stop material that is attached along the joint of a concrete structure, prevents water from entering from the joint, and provides seismic performance. The water-stopping material joint method and the water-stopping material are applied.

  When water enters a joint portion that is a boundary between adjacent concrete structures, water leaks inside, for example, a tunnel or a building. As a method for preventing this water leakage, a water stop (waterproof) construction method in which a band-like water stop material is embedded along the joint of the concrete structure is employed (Non-patent Document 1).

Waterproof Journal (March 1996, pages 85-87)

  As a water stop construction method embedded in the concrete structures a and b, there is a water stop material B imparted with stretchability. The water-stopping material B is made of an elastic material such as vinyl chloride or vulcanized rubber, and has a stretchable valve m at the center and hems n on the left and right as shown in FIG. Is provided with a protrusion p, and a skirt n is sequentially embedded when the concrete structures a and b are placed.

  Further, there is a water stop material A as a water stop construction method after placing the concrete structures a and b. The water-stopping material A is made of an elastic material such as vinyl chloride and vulcanized rubber like the water-stopping material B, and is attached across the joint c of the joints of the concrete structures a and b as shown in FIG. It is a rubber member e with a built-in fiber reinforcement layer d, comprising a stretchable valve f in the center and left and right hems g. The hem g is a holding member h and a bolt. It is fixed with i.

  Furthermore, the present inventors have already made a proposal for improving the water-stopping material A (Patent Document 1).

Japanese Patent Application No. 2005-044141

  The outline of the proposed water-stopping material C is used in the same manner as the water-stopping material A, and is arranged along the joints of the opposing concrete structures a and b, and the displacement of the concrete structures a and b is determined. The valve s to be absorbed and the outer surfaces of the opposing concrete structures a and b are in contact with the wings t formed on the left and right sides of the valve s, and embedded in the opposing concrete structures a and b. And a protrusion v having a bulging portion u at a tip portion formed on the wing portion t.

  The water stop material is an integral part of rubber or rubber-like flexible resin, and is manufactured as an elongated member by extrusion molding, but is not necessarily completely integrated, It is preferable that the water stop material is connected to the corner at an angle in the middle of the connection, particularly at the corners of the concrete structures a and b. However, in the case of a water stop material for a hollow valve, the hollow portion is crushed and cannot be easily jointed. Therefore, the core is inserted into the hollow portion and joint-molded.

  In joint molding, an adhesive joint method using a rubber vulcanized joint and an adhesive can be used, but there are problems in the joint because each valve portion is hollow. In the former method, a rubber material or a metal material may be used as the core.

  However, it is not preferable to place the rubber core in a hollow valve and joint it so that the rubber core is contained as it is because stress concentrates on the joint when the structure is stretched after construction. In addition, when a metal core is inserted into a hollow bulb and jointed, the valve is opened after molding and the metal core is taken out. However, it is necessary to seal the incision again. However, since it is hollow, there is a drawback in that it cannot be sufficiently crimped, resulting in poor adhesion and increased costs. On the other hand, in the case of jointing with the latter adhesive, there is a disadvantage that stress is concentrated on the joint part because the used core is included as it is.

  The present invention relates to an improvement of a water-stopping material in which the valve portion of the water-stopping material as described above has a closed hollow structure, and in particular, the water-stopping material is further connected to a longer or water-stopping material. The joint method which provides a corner part in this, and such a water stop material are provided.

  The first gist of the present invention is a hollow valve disposed along a joint of opposing concrete structures and absorbing displacement of the concrete structure, and formed on the left and right sides of the hollow valve on the outer surface of the concrete structure. A joint method of a waterstop material comprising a fixed or embedded wing portion and a waterstop material, wherein both cores are joined together with a rigid urethane foam core that substantially matches the cross-sectional shape of the hollow valve. The water stop is characterized by being inserted into a hollow bulb at the end of the water material, and in such a state, the ends of both water stop materials are integrated while containing the core using rubber vulcanization or an adhesive. It provides a joint method for materials.

  The second gist of the present invention resides in a waterstop material having a hollow valve in which a rigid urethane foam is integrally incorporated in a valve of a joint part, and the hard urethane foam is applied with force from the outside of the valve. In addition, the present invention provides a waterstop material having a hollow valve characterized by being collapsed.

  In the joint method of water-stopping material having a hollow valve of the present invention, it can be applied to any type of water-stopping material, and solves adhesion failure and cost increase at the time of joint, It is possible to eliminate stress concentration which becomes a problem in the joint including the center core.

  In other words, this is because the core used for the joint is made of a very special material that has never been used in the past, and can be easily disintegrated by tapping it from the outside after molding. This made it possible to eliminate all the conventional drawbacks.

  Now, a hollow valve that is arranged along the joint of the opposing concrete structure and absorbs the displacement of the concrete structure, and is formed on the left and right sides of the hollow valve and fixed to the outer surface of the concrete structure or embedded in the hollow valve In the waterstop material comprising the wing portion, the valve for displacement absorption is provided in the central portion, and the wing portion is formed at both ends of the valve. The central valve is a hollow portion that prevents intrusion of earth and sand during and after deformation.

  In the water stop material which has the hollow valve formed by integrating the 1st rigid urethane type foam of this invention in the valve | bulb of a joint part, applying the force from the outside of a valve | bulb, the said rigid urethane type foam collapses It is a water stop material having a hollow valve.

  In the joint method of the second water-stopping material of the present invention, the hollow valve at the end of both water-stopping materials to which the inner core made of a rigid urethane foam substantially matched with the cross-sectional shape of the hollow valve is joined. In this state, the ends of both water-stopping materials are integrated with rubber vulcanization or using an adhesive to enclose the core, and is particularly suitable for the structure of the bent portion of the water-stopping material. The L-shaped core is used to insert each straight portion into the hollow valve at the end of the water-stopping material to form a cavity surrounding the bent portion and the end of the inserted water-stopping material. This is a joint method for a waterstop material having a hollow valve that is filled with unvulcanized rubber and vulcanized and integrated.

  The rigid urethane foam as the core is a polyol whose principal component is water glass, and the polyol component and isocyanate component are approximately 1: 1. The expansion ratio of the hard urethane foam is 4 to 6, preferably 4.3 to 5.3. The shape of the hard urethane foam core is a shell shape where it becomes a joint part, and after the joint molding, the hard urethane foam core is crushed with a hammer or the like. . The above-mentioned hard urethane foam core can be pulverized relatively easily with a hammer, etc., eliminating stress concentration at the joint and eliminating the need to remove the core, eliminating the problem of poor adhesion and increased costs. It is. By forming the cross-sectional shape of the joint portion of the hard urethane-based foam core into a shell shape, it can be molded without being crushed by the vulcanization press surface pressure, and can be easily pulverized.

  In particular, in the case of a water glass type used as a polyol, the surface skin layer of the foam is hard and the inside is a weak foam, so that the grindability can be improved.

  Examples of blending compositions are those used in conventional urethane foams, preferably rigid urethane foams. Polyols are short-chain polyfunctional hydroxyl groups such as polyethers, polyesters, and water glass-based polyols. The range is about 350 to 550. As the isocyanate, TDI prepolymer, crude TDI, polymeric MDI, modified MDI, isocyanate and the like can be used. In addition, foam stabilizers such as silicone, amine-based catalysts, foams such as chlorofluorocarbon and water, fillers, other auxiliary materials, and the like that are conventionally used in the production of rigid urethane are used. .

  The waterstop material of the present invention is formed of rubber or rubber-like flexible resin, and is usually manufactured as an elongated member by extrusion molding. Note that non-vulcanized butyl rubber having excellent adhesion to a concrete structure can be attached to the wing surface to ensure water-stopping.

  The present invention will be further described below with reference to the drawings. FIG. 2 is a side view of the waterstop material 1 used here, and FIG. 3 is a cross-sectional view taken along line AA. 2 is a hollow valve provided in the center, and 3 is a wing extending to the left and right. 4 is a side view of the core 5, FIG. 5 is a cross-sectional view taken along the line BB, and FIG. 6 is a cross-sectional view taken along the line CC. The core 5 is a hard urethane foam. In addition, the whole dimension of the water stop material 1 and the center core 5 was described in the figure.

  The hollow portion 2 of the water blocking material 1 was inserted into the straight portions 5a and 5b of the core 5 by 200 mm. And it set in the type | mold 9 which has the cavity 8 surrounding the bending part 5c and the edge part 30mm of the water stop material 1 with the bending part 5c of the center core 5 exposed.

  Then, a non-vulcanized rubber was filled in the cavity 8 and vulcanized to connect the water-stopping material in an L-shape to obtain a new water-stopping material 10. FIG. 7 shows the water stop material 10 obtained, and FIG. 8 is a cross-sectional view taken along the line DD and a cross-sectional view taken along the line EE. The bent portion 5c of the core 5 is crushed by hitting it with a hammer from the outside of the hollow bulb 2.

  The outline of the composition of the rigid urethane foam forming the core 5 is MDI as the polyisocyanate component, sodium silicate aqueous solution as the polyol component (sodium silicate in the polyol), and the foaming catalyst. Etc. are blended. Both are used in a weight ratio of 1: 1.

  The present invention is a water-stopping material joint and a water-stopping material as described above, and can be jointed with a water-stopping material while containing the core, which solves the conventional stress concentration and eliminates the need for an adhesive treatment. It has been solved. By using such a water-stopping material, the improvement in seismic performance of underground structures such as concrete structural members, road tunnels, and common grooves is remarkable. And even if a big relative shift | offset | difference arises between concrete structures, water-stop can also be provided very cheaply, and high water-stop can be maintained. In addition, cost reduction (material cost, reduction of construction cost, shortening of work period) is remarkable.

FIG. 1 is a cross-sectional view of a conventional waterstop material during construction. FIG. 2 is a side view of the water stop material used in the present invention. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a side view of the core. FIG. 5 is a sectional view taken along line BB. FIG. 6 is a cross-sectional view taken along line CC. FIG. 7 is a side view of the waterstop material obtained in the present invention. FIG. 8 is a sectional view taken along line DD. FIG. 9 is a sectional view taken along line EE.

Explanation of symbols

1. Water-stop material used in the present invention,
2. Hollow valve,
3 ... Wings
5.
5a, 5b ... the straight part of the core,
5c ... bent part of the core,
8 Cavity,
9 ... type,
10. The waterstop material of the present invention.

Claims (7)

  A hollow valve disposed along the joint of the opposing concrete structure and absorbing the displacement of the concrete structure, and formed on the left and right sides of the hollow valve and fixed to or embedded in the outer surface of the concrete structure In the hollow valve at the end of both water-stopping materials, which is a joint method of a water-stopping material consisting of a wing and a rigid urethane foam core that almost matches the cross-sectional shape of the hollow valve A joint method for a water-stopping material having a hollow valve, wherein the end portions of both water-stopping materials are integrated with rubber vulcanization or an adhesive while enclosing the core in this state.   Using an L-shaped core made of a rigid urethane foam having a bent portion and a straight portion extending from the bent portion, each straight portion was inserted into a hollow valve at the end of the water stop material, and the bent portion and the inserted portion were inserted. The joint method of the water stop material which has a hollow valve of Claim 1 which formed the cavity surrounding the edge part of a water stop material, filled the unvulcanized rubber in this cavity, and vulcanized this.   The joint method for a waterstop material having a hollow valve according to claim 1 or 2, wherein the polyol component of the hard urethane foam is a polyol mainly composed of water glass.   4. The joint method for a waterstop material having a hollow valve according to claim 3, wherein the polyol component and the isocyanate component are approximately 1: 1.   5. The water-stopping material joint method having a hollow valve according to any one of claims 1 to 4, wherein the expansion ratio of the hard urethane foam is 4 to 6.   6. The joint method for a waterstop material having a hollow valve according to claim 5, wherein the expansion ratio of the hard urethane foam is 4.3 to 5.3.   A water-stopping material having a hollow valve formed by integrating a rigid urethane foam into a valve of a joint part, characterized in that the rigid urethane foam is collapsed by applying force from the outside of the valve. A water stop material having a hollow valve.

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