JPS6290455A - Water stop panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a water stop plate that is installed at the joints of concrete buildings to prevent water from penetrating into the joints. be.

[Prior Art] Conventionally, water stop plates are known in which an expansion layer made of a water-swellable material is formed on at least a portion of the surface.

[Problems to be Solved by the Invention] This water stop plate is formed into a long strip, and is transported to a work site in a rolled state, and cut to a desired length for use. However, for example, if this water stop plate gets wet with rainwater, groundwater, etc. while it is stored on site, the expansion layer expands with water, making subsequent installation of the water stop plate difficult. Not only that, but the function of the water stop plate is impaired and it becomes unusable immediately.

The present invention has been made to solve these problems. In other words, the present invention is designed to prevent the expansion layer from expanding with water in rainwater, underground water, etc. during storage before use, and to prevent the expansion layer from expanding in concrete. The object of the present invention is to provide a water stop plate that starts to work due to water expansion only after it is buried.

[Means for solving the problem] In order to solve the purpose, the water stop plate of the present invention has the following features:
It is characterized in that an alkali-soluble water-blocking film part that can be at least partially dissolved by alkaline water is formed on the surface of the expansion layer of the water-stop plate main body.

Further, the entire water stop plate may be formed of an expansion layer made of a water-swellable material, and the alkali-soluble water-shielding film portion may be formed on the surface of the expansion layer.

Further, the water stop plate main body has stress absorbing holes that are hollow or filled with a soft elastic porous material formed at least on both longitudinal side edges, and the expansion layer is formed along the outer side of the stress absorbing hole. The alkali-soluble water-blocking film portion may be formed on the surface of the expansion layer.

[Function] According to the above configuration, at least a portion of the alkali-soluble water-blocking membrane portion dissolves due to the permeation of alkaline water into the concrete after the water stop plate is embedded in the joint portion. When the alkali-soluble water-shielding membrane portion dissolves, the expansion layer comes into contact with water and starts to function as a 11-water plate in which expansion occurs due to water content.

[Example] FIGS. 1 and 2 are a perspective view and a cross-sectional view of a water stop plate according to an example of the present invention and a state in which it is used.

This water stop plate 1 has a band-like shape as a whole, and is made of a non-expandable material such as rubber or plastic, such as chlorinated polyethylene, on both sides of the main part of the water stop plate main body 2. An expansion layer 3.3 is formed of a known water-swellable material in which a resin such as a crosslinked copolymer of maleic anhydride and inbutylene is dispersed.

Therefore, the water stop plate l has two edges 2 on both sides of the water stop plate main body 2.
a, 2a are made into large diameter cylinders, and stress absorption holes 4, 4 are formed inside them on both sides, and the surface layer of the outer half of the cylindrical side edges 2a, 2a is thinly cut out, and the inside of the notch recess 2d is formed. The expansion layers 3, 3 are formed.

In addition, a large-diameter cylindrical intermediate stress absorption hole 2c is formed in the center of the intermediate plate portion 2b of the waterstop body 2, and the intermediate plate portion 2b is made of a corrugated plate having protrusions 2e on the upper and lower surfaces. ing.

Further, the stress absorbing hole 4 may be filled with a soft bone porous material, and the hole may have various shapes such as a square hole, an elliptical hole, etc. in addition to a round hole.

On the surface of the expansion layer 3.3 is an alkali-soluble water-blocking film portion 5. made of chlorinated polyethylene and an alkali-soluble resin, such as a copolymer of maleic anhydride and isobutylene.
5 is coated.

Next, the operation of the above configuration will be explained.

As shown in FIG. 2, the above-mentioned water stop plate 1 is buried at the joint C of the poured concrete A and B in a direction perpendicular to the joint C. Then, the water entering the joint C moves in both directions from the surface of the water stop plate 1, contacts the alkali-soluble water-shielding membrane parts 5, 5 formed on the surface of the expansion layer 3.3, and breaks down the concrete. The water becomes alkaline water due to the alkaline component therein, and a part or all of the alkali-soluble water-blocking membrane parts 5, 5 are dissolved. Next, this alkaline water contacts the surfaces of the expansion layers 3, 3 and causes the expansion layers 3, 3 to hydrate and expand. As a result, the expansion layer 3.3 adheres closely to the concrete surface to maintain sealing properties and prevent water from entering. Therefore, when the expansion layer 3.3 expands further and applies an excessive pressure exceeding the contact pressure necessary for water-stopping to the sealed space of concrete (A) and H, the expansion layer 3.3 directly absorbs the stress on both sides. Since it expands into the hole 4.4 and effectively absorbs the excessive internal stress caused by the expansion, it does not cause cracks in the concrete.

In addition, when fresh concrete is placed after a part of the water stop plate 1 has been fixed to a part of pre-hardened concrete, etc., the alkali-soluble water stopper in contact with the hardened concrete may be Immediately before fixing the water stop plate l to the membrane part, it is possible to apply alkaline water or the like to bring the alkali-soluble water-shielding membrane part into a molten or semi-molten state before fixing the water stop plate l. Details of the structure and function of the water stop plate shown in FIGS. 5B-J will be omitted.

The experimental results using the specimen are shown below.

Note 1) Crosslinked product of copolymer of maleic anhydride and inbutylene Note 2) Copolymer of maleic anhydride and isobutylene The shape of each specimen is the same as the example shown in FIGS. 1 and 2.

Experimental results of expansion characteristics (see Figure 6) Specimen A was buried in concrete for 96 hours (
We prepared three bodies: one buried for 72 hours (marked with Δ), and one that was not buried (marked with O), and buried at 20'C.
The dimensional change of the expanded part was measured by immersing it in tap water.

As a result, in the case of the case buried in concrete for 96 hours and 72 hours, the water-blocking membrane part was dissolved by the alkaline water in the concrete and the expansion part expanded early, and in the case of the case that was not buried, the water-blocking membrane part was not present. Due to this, there is almost no expansion. This confirmed the effectiveness of the alkali-soluble water-blocking membrane.

Experimental results of water-stopping performance (see Figures 7 and 8) As shown in Figure 7, each of the above specimens 1 was installed on the preceding concrete 6, and the following concrete was placed so that the initial joint gap t was 10 am. After one week of curing, water was injected into the joint gaps, and the joint gaps were expanded once and then changed to shrink.
The water stop performance was measured between n' and 5 kgf/c rn'.

FIG. 8A shows the performance results of the waterstop plate according to the present invention, and FIG. 8B shows the performance results of a conventional product without an alkali-soluble waterstop film portion.

In the water stop plate of the present invention, water is stopped under various water pressures regardless of the expansion and contraction of the joint (Fig. 8A), but in the conventional product, the water stop function is lost after the joint expands and once it shrinks after expansion. It is. (Fig. 8B) This is because in the conventional product, the expansion part absorbs water and expands before the ready-mixed concrete solidifies, resulting in dehydration of the surrounding concrete and poor curing.This is also the superiority of the present invention. was confirmed.

[Effects of the Invention] As explained above, according to the water stop plate having an alkali-soluble water-shielding film portion according to the present invention, the expansion layer does not allow the alkali-soluble water-shielding film portion to form for the first time after being buried in concrete. Since it dissolves and starts expanding with water, even if this water stop plate gets wet with rainwater, groundwater, etc. at the site or other storage location, the expansion layer will not expand with water, and the water stop function will also be improved. There is.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a water stop plate according to an embodiment of the present invention, and FIG.
The figure is a cross-sectional view showing the same usage state, Figures 3 and 4 are cross-sectional views showing other examples of the same water stop plate, and Figures 5 A-J show other examples of the same water stop plate. 6 is a graph showing the test results, FIG. 7 is a sectional view showing the test method, and FIG. 8A
, B are diagrams showing test results. 1.11, 21.31...Water stop plate, 2,12゜22
, 32...Water stop plate body, 2a, 12a, 22a...
・Side edge, 3, 13, 23. 33... Expansion layer, 5゜1
5.25.35...Waterproof membrane part. Patent applicant CI Kasei Co., Ltd. Figure 1 Figure 2 Figure 3 j Figure 4 Figure 5 F Figure 5 G Figure 5 J 32 32c r 10>/
Notsuichi Figure 7 Water pressure ↓ Water l c: Electricity.

Claims (3)

[Claims] (1) In a water stop plate in which an expansion layer made of a water-swellable material is formed on at least a portion of the surface of the water stop plate body, at least a portion of the surface of the expansion layer can be dissolved by alkaline water. A water stop plate characterized by forming an alkali-soluble water-blocking film portion. (2) The water stop plate according to claim 1, wherein the water stop plate main body is formed entirely of an expansion layer made of a water-swellable material. (3) The water stop plate body has stress absorbing holes that are hollow or filled with a soft elastic porous material formed at least on both longitudinal side edges, and has water-expandable properties along at least the outer portion of the stress absorbing hole. 2. The water stop plate according to claim 1, wherein an expansion layer made of a material is formed.