JP3165772U - Water stop structure of concrete joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dust and the like from adhering to a sticky rubber constituting a main body of a waterproof material in a waterproof structure of a concrete joint, and to deform the rubber after casting concrete. To prevent water stoppage and ensure water stoppage performance. SOLUTION: In a water-stopping structure of a concrete joint where a post-casting concrete 12 is connected to a pre-cast concrete 11 via a water-stopping material 20, the water-stopping material 20 is provided with sticky rubber at least on its outer surface. 21 having an outer skin 22 made of fibers attached to at least a part of the outer surface of the main body 21. [Selection diagram] Fig. 1

Description

  The present invention relates to a water stop structure of a concrete joint.

  Conventionally, as a water stop structure of a concrete joint portion, as described in Patent Document 1, there is one in which post-cast concrete is handed over to a pre-cast concrete through a water stop material. At this time, as the water-stopping material, a material having a main body provided with at least an adhesive non-vulcanized butyl rubber on the outer surface, and a water-soluble polyvinyl alcohol film provided on at least a part of the outer surface of the main body is used. .

  In the water stop structure of the concrete joint described in Patent Document 1, since the outer surface of the sticky main body of the water stop material is covered with a film made of polyvinyl alcohol and can prevent adhesion of dust, the outer surface of the main body This eliminates the need to remove the release paper that was used just before placing the post-cast concrete, and as a result, stops water at the end of the pre-cast concrete. It is said that it is possible to leave the material in an installed state and immediately place post-cast concrete at an optimal timing, thereby greatly improving the workability. In addition, since the polyvinyl alcohol film is water-soluble, the outer surface of the main body is exposed by being dissolved by moisture in the cast concrete after being placed. As a result, the main body and the post-cast concrete are in direct contact with each other. It is said that it can be firmly bonded and integrated to prevent water leakage between the pre-cast concrete and post-cast concrete.

Patent 2941775

  The water-stopping material used in the concrete joints must have its body surface firmly bonded and integrated with the pre-cast concrete and post-cast concrete to completely prevent water leakage between the pre-cast concrete and post-cast concrete. is there. For this reason, in the water stop structure of the concrete joint part described in Patent Document 1, it is necessary to increase the degree of adhesion of the non-vulcanized butyl rubber constituting the main body, which is more flexible and easily deformed. Means that you need to.

  However, if the body of the water-stopping material becomes flexible and easily deformed, when the post-cast concrete is placed, the heavy flow force of the post-cast concrete greatly deforms the main body of the water-stopping material, and the predetermined water-stop performance is achieved. There is a possibility that it cannot be secured.

  The film made of polyvinyl alcohol covering the main body of the water-stopping material is also dissolved and disappeared by the moisture in the cast concrete after being placed, and does not reinforce the main body, but the above-mentioned large size of the main body It does not deter deformation.

  An object of the present invention is to prevent dust from adhering to the sticky rubber constituting the main body of the water-stopping material in the water-stopping structure of the concrete joint, and The purpose is to prevent the deformation at the time of installation and to secure the water stop performance.

  The invention according to claim 1 is a water-stopping structure for a concrete connection part in which post-cast concrete is transferred to a pre-cast concrete through a water-stopping material, wherein the water-stopping material has at least an adhesive rubber on the outer surface. And an outer skin made of fibers is attached to at least a part of the outer surface of the main body.

  The device according to claim 2 is the device according to claim 1, wherein the main body has a long shape with a rectangular cross section, and is peeled off when used on the lower surface of the rectangular cross section that is stuck to the pre-cast concrete during use. The release paper is provided, and the outer skin is attached to at least the upper surface of the rectangular cross section.

  The device according to claim 3 is the device according to claim 1 or 2, wherein the outer skin is made of paper powder.

  The device according to claim 4 is the device according to claim 1 or 2, wherein the outer skin is made of a nonwoven fabric.

(Claim 1)
(a) The outer surface of the main body made of the sticky rubber of the water-stopping material is covered with the outer skin made of fibers, so that adhesion of dust and the like can be prevented. Accordingly, the release paper for covering the outer surface of the main body is not necessary, and it is possible to omit the release paper removal work performed immediately before placing the post-cast concrete. It is possible to leave with the water-stopping material installed at the end, and to place the post-cast concrete immediately at the optimum timing, and to greatly improve the workability.

  In addition, the fibers that make up the outer skin of the water-stopping material are dissociated by the moisture in the cast concrete after being cast and scattered on the outer surface of the main body, and the outer surface of the main body is exposed to the side of the post-cast concrete Become. Therefore, the main body and the post-cast concrete are directly pressed and firmly bonded and integrated, and water leakage between the pre-cast concrete and the post-cast concrete can be prevented.

  (b) An outer skin made of fibers is attached to the outer surface of the main body of the water-stopping material, and continues to follow the outer surface of the main body without disappearing due to melting by moisture in the cast concrete after the fibers are placed, Reinforces the body. Therefore, the surface of the main body of the water-stopping material must be firmly bonded and integrated with the pre-cast concrete and the post-cast concrete to completely prevent water leakage between the pre-cast concrete and the post-cast concrete. Even if the degree of adhesion is increased and the rubber becomes flexible and easily deformed, the outer skin made of the above-mentioned fibers becomes a reinforcing material for the flexible rubber. In other words, when the post-cast concrete is placed, the heavy flow force of the post-cast concrete acts on the above-mentioned flexible rubber constituting the main body of the water-stopping material. The outer skin made of fiber can be suppressed, and the desired water-stopping performance by the water-stopping material can be secured.

(Claim 2)
(c) The body of the water-stopping material has a long rectangular cross section, and a release paper that is peeled off during use is provided on the lower surface of the rectangular cross section that will be stuck to the pre-cast concrete during use. An outer skin is attached to at least the upper surface. Therefore, it is possible to prevent the dust from adhering to the lower surface of the main body with the release paper before using the water-stopping material. In addition, when the water-stopping material is used, the rubber on the lower surface of the main body from which the release paper has been peeled can be adhered and stably attached to the surface of the pre-cast concrete.

(Claim 3)
(d) An outer skin made of paper dust can be easily attached to the outer surface of the rubber by passing an adhesive rubber constituting the main body of the water-stopping material through the paper dust contained in the box. The fiber of the paper composing the paper powder is dissociated and scattered on the outer surface of the main body without being dissolved by moisture in the post-cast concrete.

(Claim 4)
E . The fibers constituting the nonwoven fabric are dissociated and scattered on the outer surface of the main body without being melted by moisture in the post-cast concrete.

FIG. 1 is a schematic view showing a water stop structure of a concrete joint portion. FIG. 2 is a cross-sectional view showing the waterstop material.

  FIG. 1 shows an embodiment of a water stop structure of a concrete joint portion according to the present invention, in which a post-cast concrete 12 is cast over a pre-cast concrete 11 through a water blocking material 20.

  As shown in FIG. 2, the water blocking material 20 has a main body 21 provided with at least an adhesive rubber on the outer surface, and an outer skin 22 made of fibers is attached to at least a part of the outer surface of the main body 21. .

  The main body 21 of the water blocking material 20 of the present embodiment has a long shape with a rectangular cross section (other cross section such as a bowl-shaped cross section is also possible) made of an adhesive non-vulcanized butyl rubber. The main body 21 is provided with a release paper 23 to be peeled off at the time of use on the lower surface of a rectangular cross section to be stuck to the pre-cast concrete 11 by the adhesive force of the non-vulcanized butyl rubber at the time of use. The main body 21 has an outer skin 22 attached to at least the upper surface of a rectangular cross section, in this embodiment, the upper surface and both side surfaces thereof by the adhesive force of the unvulcanized butyl rubber.

  The waterproof material 20 can employ paper dust (or a paper sheet) as the outer skin 22. The main body 21 provided with the release paper 23 of the water blocking material 20 on the lower surface is passed through the paper powder accommodated in the box, etc., so that at least the upper surface of the main body 21 is adhered to the adhesive force of the unvulcanized butyl rubber of the main body 21 The outer skin 22 is made by attaching paper powder.

  The water blocking material 20 can also employ a non-woven fabric as the outer skin 22. A non-vulcanized sheet made of fiber such as rayon, polyester, polypropylene, or polyethylene is attached to at least the upper surface of the main body 21 by the adhesive force of the unvulcanized butyl rubber of the main body 21 to form the outer skin 22.

  The water blocking material 20 has a tape shape wound around a core (not shown) with the release paper 23 inside, for example, unwound from the outer end, and peeled off the release paper 23 in the rewound portion. Then, it is used by being stuck to a predetermined position such as the center in the width direction of the concrete joining surface of the pre-cast concrete 11.

Therefore, the water stop structure of the concrete joint portion according to the present embodiment is implemented as follows.
(1) Placing pre-cast concrete 11

  (2) After the pre-cast concrete 11 is dried or in a dry state, the bottom surface of the main body 21 from which the release paper 23 has been peeled off in the water blocking material 20 is the surface of the pre-cast concrete 11 and the post-cast concrete 12 is cast. Stick to the surface to be spliced. In this state, although it will wait until the joining time of the post-cast concrete 12, the outer surface made of the non-vulcanized butyl rubber with the adhesive of the main body 21 is covered with the outer skin 22 and is not exposed to the outside, There is no possibility that dust or the like adheres to the outer surface of the main body 21.

  (3) When the time for joining the post-cast concrete 12 is reached, the post-cast concrete 12 is handed over to the pre-cast concrete 11 through the water blocking material 20 of the above (2). At this time, the water blocking material 20 is placed without removing the outer skin 22 from the main body 21, but fibers such as paper powder or nonwoven fabric constituting the outer skin 22 are dissociated by moisture in the post-cast concrete 12. It is scattered on the outer surface of the main body 21, and the outer surface of the main body 21 is exposed to the side of the post-cast concrete 12. As a result, the pre-cast concrete 11 and the post-cast concrete 12 are in direct pressure contact with the main body 21 of the water blocking material 20, and the CaO component in the cement of the pre-cast concrete 11 and the post-cast concrete 12 is unvulcanized in the main body 21. It chemically reacts with the carboxyl groups of the butyl rubber to form ionic bonds, and the main body 21 of the water blocking material 20 is chemically firmly bonded and integrated with the pre-cast concrete 11 and the post-cast concrete 12.

According to the present embodiment, the following operational effects can be obtained.
(a) The outer surface of the main body 21 made of sticky rubber of the water-stopping material 20 is covered with the outer skin 22 made of fiber, and adhesion of dust and the like can be prevented. Therefore, the release paper 23 for covering the outer surface of the main body 21 is not necessary, and the removal work of the release paper 23 performed immediately before placing the post-cast concrete 12 can be omitted. As a result, It is possible to leave the water-stopping material 20 at the end of the pre-cast concrete 11 and to place the post-cast concrete 12 immediately at the optimum timing, thereby greatly improving the workability. Become.

  Further, the fibers constituting the outer skin 22 of the water blocking material 20 are dissociated by the moisture in the placed concrete 12 and scattered on the outer surface of the main body 21, and the outer surface of the main body 21 is spread on the outer concrete 12. It will be exposed to the side. Therefore, the main body 21 and the post-cast concrete 12 are directly pressed and firmly bonded and integrated, and water leakage between the pre-cast concrete 11 and the post-cast concrete 12 can be prevented.

  (b) An outer skin 22 made of fibers is attached to the outer surface of the main body 21 of the water-stopping material 20, and after the fibers are placed, the outer skin 22 does not disappear due to melting by moisture in the cast concrete 12. It continues to follow the outer surface and becomes a reinforcing material for the main body 21. Accordingly, the surface of the main body 21 of the water-stopping material 20 is firmly bonded and integrated with the pre-cast concrete 11 and the post-cast concrete 12 to completely prevent water leakage between the pre-cast concrete 11 and the post-cast concrete 12. Even if the degree of adhesion of the rubber constituting the main body 21 is increased, and the rubber becomes flexible and easily deformed, the outer skin 22 made of the above-mentioned fibers becomes a reinforcing material for the flexible rubber. That is, when the post-cast concrete 12 is placed, the heavy flow force of the post-cast concrete 12 acts on the above-described flexible rubber constituting the main body 21 of the water blocking material 20 and tries to greatly deform the flexible rubber. However, the outer skin 22 made of fibers suppresses the deformation, and a desired water-stopping performance by the water-stopping material 20 can be secured.

  (c) The main body 21 of the water blocking material 20 has a long shape with a rectangular cross section, and a release paper 23 to be peeled off at the time of use is provided on the lower surface of the rectangular cross section to be stuck to the pre-cast concrete 11 at the time of use. The outer skin 22 is attached to at least the upper surface of the rectangular cross section. Therefore, before the water blocking material 20 is used, dust and the like can be prevented from adhering to the lower surface of the main body 21 by the release paper 23. Further, when the water blocking material 20 is used, the rubber on the lower surface of the main body 21 from which the release paper 23 has been peeled can be adhered and stably attached to the surface of the pre-cast concrete 11.

  (d) The outer skin 22 made of paper dust can be easily attached to the outer surface of the rubber by passing an adhesive rubber constituting the main body 21 of the water-stopping material 20 into the paper dust contained in the box. The paper fibers constituting the paper powder are dissociated and scattered on the outer surface of the main body 21 without being melted by moisture in the post-cast concrete 12.

  (e) An outer skin 22 made of a non-woven sheet in which fibers such as rayon, polyester, polypropylene, and polyethylene are simply entangled with the outer surface of an adhesive rubber constituting the main body 21 of the water blocking material 20 Can be attached. The fibers constituting the nonwoven fabric are dissociated and scattered on the outer surface of the main body 21 without being dissolved by moisture in the post-cast concrete 12.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the scope of the present invention. However, it is included in the present invention. For example, a sticky rubber can be widely used for the main body of the water stop material. The main body may be formed by, for example, wrapping the outer periphery of a normal rubber core with adhesive rubber such as non-vulcanized butyl rubber.

  Moreover, the outer skin of a water stop material can employ | adopt widely the film formation material which consists of fibers. When a paper sheet is used as the outer skin, for example, chemical pulp is changed to alkali cellulose with sodium hydroxide, and monochloroacetic acid is reacted to produce carboxymethyl cellulose (abbreviated as CMC), which is then mixed with ordinary chemical pulp. Thereafter, a paper made of paper that has been treated with an alkali and easily separated into water can be suitably employed.

  According to the present invention, in the water-stopping structure of the concrete joint portion, dust and the like are prevented from adhering to the adhesive rubber constituting the main body of the water-stopping material. It is possible to prevent water deformation and ensure water stopping performance.

10 Water-stopping material 11 Pre-cast concrete 12 Post-cast concrete 20 Water-stopping material 21 Main body 22 Skin 23 Release paper

Claims (4)

In the water stop structure of the concrete joint where the post-cast concrete is handed over to the pre-cast concrete through the water stop material,
A water stop structure for a concrete joint, characterized in that the water stop material has a main body provided with at least an adhesive rubber on the outer surface, and an outer skin made of fibers is attached to at least a part of the outer surface of the main body. .   The main body has a long rectangular cross section, and is provided with release paper that is peeled off during use on the lower surface of the rectangular cross section that will be stuck to pre-cast concrete during use, and the outer skin adheres to at least the upper surface of the rectangular cross section. The water stop structure of the concrete joint part of Claim 1 formed.   The water stop structure of the concrete joint part according to claim 1 or 2, wherein the outer skin is made of paper powder.   The water stop structure of the concrete joint part according to claim 1 or 2, wherein the outer skin is made of a nonwoven fabric.

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