JPH0575305U - Water stop structure - Google Patents

Abstract

(57) [Summary] [Purpose] A water-expanding waterproof material can be applied even on a wet site, and milk can be prevented from wrapping around the bottom of the water-expanding waterproof material after it has been applied, and the frame of the first-placement concrete. Even if there is unevenness or unevenness on the surface, it is to be able to easily and surely apply the water-expansion waterproofing material. [Structure] The water-expanding waterproof material 2A is embedded in the primary concrete 1 before the primary casting concrete 1 hardens. The secondary casting concrete 3 is cast on the body surface of the primary casting concrete 1. The water-expansion waterproofing material 2A is embedded in the primary casting concrete 1 and the secondary casting concrete 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a waterproof structure applied to a concrete joint in the field of civil engineering and construction.

[0002]

[Prior Art]

 Recently, waterproofing materials for civil engineering and construction using super absorbent polymers have been widely used. These water-expandable water-stopping materials are for water-stopping between segments.For example, super absorbent polymer is mixed with a fixing material such as rubber or plastic, molded, and applied to the concrete joint area to prevent water leakage. ing. In this case, if a water-expanding waterproof material is applied between the primary concrete and the secondary concrete, the superabsorbent polymer in the water-expanding waterproof material will expand due to the groundwater, etc. that gets wet from the outside, and the By expanding the fixing material, the entire water-expandable waterproof material that is a molded product expands, and as a result, the water-expandable waterproof material press-bonds to both the primary concrete and the secondary concrete. This crimping force prevents water leakage from the jointing area.

In order to form such a water blocking structure, for example, a water-expanding water blocking material as disclosed in Japanese Examined Patent Publication No. 1-25798 is fixed to the skeleton surface of primary concrete with an adhesive or nailing. To do. After this, the secondary concrete is cast on the skeleton surface of the primary cast concrete, and the water-expanding water blocking material is buried.

[0004]

[Problems to be solved by the device]

 However, it has been found that various problems occur at actual construction sites. That is, the method of adhering the water-expansion waterproofing material to the skeleton surface of the first-placed concrete with an adhesive is not possible if the skeleton surface is in a wet state. When nailing the water-expanding waterproof material, because the water-expanding waterproof material is not joined to the body surface between the nails, the water-expanding waterproof material will not be attached to the bottom of the water-expandable waterproof material during secondary concrete pouring. Milk wraps around and ceases to function as a water-expanding waterproof material.

In any of the methods, the water-stopping effect is poor unless the skeleton surface of the primary casting concrete is fairly smooth. For this reason, at the actual construction site, after placing the primary concrete, chip the concrete slab surface at the water-expansion waterproofing material construction part or apply a putty-like coating agent to the slab surface of the primary concrete. After smoothing, a water-expanding waterproof material is installed. For this reason, the simplification of construction, which was the original purpose when the water-expandable waterproof material was put on the market, was not realized, and rather construction was complicated.

The object of the present invention is to make it possible to easily apply a water-expandable waterproof material even in a wet site, prevent milk from wrapping around under the water-expandable waterproof material, and simplify the construction itself. It is to provide such a waterproof structure.

[0007]

[Means for Solving the Problems]

 The present invention is a water-stop structure in which a water-expandable waterproof material is applied to a concrete joint, and the water-expandable waterproof material is embedded in both primary and secondary cast concrete. It is related to the water stop structure.

[0008]

【Example】

 FIG. 1 is a sectional view schematically showing a water blocking structure according to an embodiment of the present invention. Between the primary casting concrete 1 and the secondary casting concrete 3, a water-expansion waterproofing material 2A having a horizontally long rectangular cross section is applied. Then, at this time, the water-expansion waterproofing material 2A is buried in both the primary casting concrete 1 and the secondary casting concrete 3. In order to form such a water blocking structure, the water-expanding water blocking material 2A is inserted after the primary concrete is cast and before the primary casting concrete 1 is cured. After this, when the secondary concrete is poured, the water-expansion waterproofing material 2A is embedded in the primary casting concrete 1 and the secondary casting concrete 3.

According to such a water stop structure, when the water expansion and water stop material is applied, the water expansion and water stop material 2A can be fixed by inserting the water expansion and water stop material 2A into the pre-set primary casting concrete 1. .. Therefore, after the water-expanding waterproof material 2A is applied to the primary casting concrete 1, there is no problem even if the body surface is wet due to rain or insufficient drying, and the water-expanding waterproof material 2A was further applied. After that, the milk of the secondary casting concrete does not wrap around to the lower part of the water-expanding waterproof material 2A. Moreover, even if the primary casting concrete 1 has irregularities on the projecting surface, the water-expanding waterproof material 2A is buried in the primary casting concrete 1, so that water should be properly stopped at this buried portion. You can Therefore, it is not necessary to adjust the surface of the skeleton of the primary casting concrete 1 by chipping or applying a smoothing agent.

Further, since the water-expansion waterproof material 2A is embedded in the primary-cast concrete 1, the contact surface 4 between the water-expansion waterproof material 2A and the primary-cast concrete 1 serves as a path for intruding water. Therefore, the path of the invading water can be extended more than before, and the water-expanding waterproof material 2A expands along the extended contact surface 4 and press-bonds to the primary pouring concrete 1, thus preventing the water expansion. The water stop performance between the water material 2A and the primary pouring concrete 1 can be made very high. Incidentally, the contact surface 5 between the secondary cast concrete and the water-expanding water blocking material 2A does not have the same problem as in the conventional method.

As shown in FIG. 1, when the water-expansion waterproof material 2A having a wide width in the horizontal direction is used, the construction condition is unlikely to change even if a force is applied to the water-expansion waterproof material 2A from the outside, and the construction is stable. Therefore, it is preferable to use it in a portion where the thickness of concrete is large. In addition, such a water-expansion waterproofing material 2A having a wide width in the horizontal direction is relatively easy to construct.

2, 3 and 4 are cross-sectional views showing a water blocking structure according to another embodiment of the present invention. In the water-stop structure shown in FIG. 2, a water-expansion water-stopping material 2B that is long in the vertical direction in FIG. 2 is embedded in the primary casting concrete 1 and the secondary casting concrete 3. In such a water-stop structure, the tangents 4 and 5 between the water-expansion water-stop material 2B and the primary casting concrete 1 and the secondary casting concrete 3 reach deep inside the concrete, respectively, so that particularly excellent waterproof performance is achieved. It is suitable for the jointing part required. Further, even if the concrete expands or contracts after the construction, the water-expanding waterproof material 2B easily follows such displacement of the concrete.

In the waterproof structure shown in FIG. 3, a water-expandable waterproof material 2 C having a substantially rhombic cross section is embedded in the primary casting concrete 1 and the secondary casting concrete 3. The water-expanding waterproof material of FIG. 1 and the water-expanding waterproof material of FIG.

In the water blocking structure shown in FIG. 4, a water-expanding water blocking material 2D having a circular cross section is embedded in the primary casting concrete 1 and the secondary casting concrete 3. The tangent lines 4 and 5 are almost semicircular. The construction of such a water-expansion waterproof material 2D is even easier than the construction of each water-expansion waterproof material shown in FIGS. Further, the water stopping performance of the water stopping structure shown in FIG. 4 was almost the same as the water stopping performance of the water stopping structure shown in FIGS.

A predetermined highly water-absorbing substance and a fixing material are mixed in each of the above water-expanding waterproof materials 2A, 2B, 2C, 2D, or the water-expanding waterproof material having another cross-sectional shape. .. As the super absorbent material, super absorbent polyacrylate resin, isobutylene- (anhydrous) maleic acid copolymer, styrene- (anhydrous) maleic acid copolymer, cross-linked polyvinyl alcohol, urethane resin, Examples thereof include saponified vinyl acetate-acrylic acid ester copolymer, saponified vinyl acetate-maleic acid ester copolymer, polyacrylonitrile fiber hydrolyzate, bentonite, white carbon, and silica gel.

As the elastic material used as the fixing material, natural rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, chlorosulfonated polyethylene, styrene-butadiene-styrene thermoplastic rubber, styrene-isoprene-styrene Known rubbers such as shaped thermoplastic rubbers, blends thereof, and urethane rubbers can be exemplified. These are kneaded together with other additives according to a conventional method in the rubber industry, and molded into a standard water-expandable water-stop material having a desired shape by extrusion, rolling, compression, heating, or the like.

With respect to the dimensions of the cross-sectional shape of the water-expandable waterproof material, the thickness of the cross-sectional shape is preferably 1.0 mm or more and 50 mm or less, and more preferably 4 mm or more and 10 mm or less. The width of the cross-sectional shape is preferably 10 mm or more and 300 mm or less, more preferably 50 mm or more and 200 mm or less. If this thickness is less than 1.0 mm, the strength of the water-swelling waterproof material itself may be insufficient, and it may be damaged by the pressure of the entering water. Further, if the thickness exceeds 50 mm, the cross-section defect rate of the concrete becomes large and the economical efficiency is not good. If the width is less than 10 mm, the depth of burying in the primary and secondary casting concrete will be only 5 mm, respectively. Sex decreases. If the above width exceeds 300 mm, it will be an obstacle to bar arrangement and is not economically preferable. The length of the water-expandable water blocking material is preferably as long as possible unless it is inconvenient to handle.

Further, as disclosed in Japanese Examined Patent Publication No. 1-12898, hard rubber, plastic, steel plate, net or the like may be embedded as a reinforcing material in the water-expanding waterproof material. In this case, the width of the reinforcing material shall be equal to or less than the width of the water-expanding waterproof material, and the thickness of the reinforcing material shall be 1% or more and 90% or less of the total thickness of the water-expanding waterproof material. Preferably.

[0019]

[Effect of the device]

 According to the water blocking structure of the present invention, since the water-expandable water blocking material is embedded in the primary-casting concrete in advance, it does not matter whether the skeleton surface of the primary-casting concrete is in a dry state or a wet state. In addition, milk does not wrap around under the water-expandable waterproof material after the water-expandable waterproof material is applied. Moreover, even if irregularities are formed on the skeleton surface of the first-placed concrete, the water-expandable water-stopping material is buried in the first-placed concrete. Therefore, it is not necessary to adjust the surface of the skeleton of the primary casting concrete 1 by chipping or applying a smoothing agent. From this, the construction of the water-expandable water blocking material is extremely easy and simple.

Further, since the water-expandable waterproof material is embedded in the primary-casting concrete, the tangent line between the water-expandable waterproof material and the primary-casting concrete serves as a path of intruding water. Therefore, the path of invading water can be extended more than before, and the water-expanding waterproof material expands along this extended tangent and press-bonds to the primary-placement concrete. The water-stopping performance between the concrete can be very high.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a water blocking structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a water blocking structure according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a waterproof structure using a water-expandable waterproof material having a substantially rhombic cross section.

FIG. 4 is a cross-sectional view showing a water blocking structure using a water expansion water blocking material having a circular cross section.

[Explanation of symbols]

 1 Primary-casting concrete 2A, 2B, 2C, 2D Water-expanding waterproof material 3 Secondary-casting concrete 4 Contact surface between water-expanding waterproof material and primary concrete 5 Contact surface between water-expanding waterproof material and secondary concrete

Claims (1)

[Scope of utility model registration request] 1. A waterproof structure in which a water-expandable waterproof material is applied to a concrete splicing part, wherein the water-expandable waterproof material is embedded in both the primary casting concrete and the secondary casting concrete. Water-stopping structure.