JPH0426501Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a water-stopping material, and relates to a sealing material that provides watertightness between structures such as caissons.

[Conventional technology]

Conventionally, in order to make structures such as concrete blocks or caissons watertight, a sealing material made of a rubber-like elastic body is compressed and inserted between these structures.

As this sealing material, for example, as shown in Fig. 7, when forming the caissons C and C with concrete, an enlarged portion is placed between the two in advance on both widthwise edges S ₁ and S ₂ .
A sealing material S made of a band-shaped rubber material having S ₃ and S ₃ is inserted so as to bridge the concrete, and concrete is poured.
As shown in the figure, a method is known in which the molded concrete portion is brought into pressure contact with the root portions P of the enlarged portions S ₃ and S ₃ of the sealing material S to achieve sealing.

[Problems with conventional technology]

In the water-stopping structure described above, sealing is achieved if the concrete surface in contact with the root portion P of the sealing material S is always a uniform and smooth surface, but if the concrete is cast in place, the contact interface between the sealing material S and the concrete Air pockets tend to cause so-called "su",
If this "su" occurs at the base P, there is a drawback that water leakage occurs regardless of the shrinkage rate of the concrete.

Alternatively, caisson etc. may be formed in advance into a shape that can be controlled and then built by stacking them on site, but it is also possible to embed sealing material between the caissons with internal pressure applied. There is a problem in that a complete seal cannot be easily achieved because it cannot be done.

[Problems solved by invention]

In view of the above-mentioned problems, this invention aims to provide a water-stopping material that can reliably achieve watertightness of structures such as caissons, and can also securely seal even pre-formed structures. It has been done.

[Technology to solve problems]

That is, the water stop material of this invention has a large cross-sectional part that fits into the deep part of the groove having a cross-sectional shape that is larger in the inner part than the opening part, and a narrow cross-sectional part that passes through the opening part, A fin-like body capable of covering the opening from the inside is integrally extended in the deep part of the groove at the boundary between the enlarged cross-section and the narrow cross-section, and the fin-like body is connected to the enlarged cross-section. The entire body is made of a rubber-like elastic material, which is forcibly bent along the outer periphery and adhered with a water-soluble substance.

〔Example〕

Next, this invention will be explained using examples.

FIGS. 1 and 2 are sectional views of an embodiment of this invention, and FIGS. 3 to 6 are sectional views illustrating the operation of an embodiment of this invention.

The water stop material 1 of this invention has an opening 1 formed on the side surface of a pre-formed block-shaped caisson, etc.
An enormous cross-sectional portion 1 that fits into the inner portion 10B of the groove 10 having a cross-sectional shape larger at the inner portion 10B than 0A.
B and the narrow cross section 1 passing through the opening 10A.
A, and as shown in FIG. 2, fin-like bodies 1C, 1C that can cover the opening 10A from the inside in the deep part 10B of the groove 10 are integrated at the boundary between the large cross-section part 1B and the narrow cross-section part 1A. As shown in FIG. ing. In the above, the water-stopping material 1 is entirely formed of a rubber-like elastic material such as chloroprene rubber, and the water-soluble material 2 for adhering the fin-like members 1C and 1C
For example, a substance that has an adhesive function when dry, but is easily dissolved in water, such as wafer, polyvinyl alcohol, or carboxymethyl cellulose, is used. Note that the dissolution rate of these water-soluble substances is appropriately selected depending on the intended use and location of the water-stopping material 1, and is adjusted so that it dissolves after the water-stopping material 1 is installed, as described later.

Furthermore, in the above embodiment, the fin-like bodies 1C, 1
C may be a water-swellable rubber, such as a rubber composition in which a water-absorbing substance such as polyvinyl alcohol, polyacrylate, carboxymethyl cellulose, or hydroxyethyl cellulose is blended with synthetic rubber.

Note that 1D in the figure is a hollow portion provided in the center of the water stop material 1 to provide elasticity.

[Effect]

Next, the operation of this invention will be explained.

In this idea, for example, as a caisson,
As shown in FIG. 3, the inner part 10B is the opening 10
A preformed one with a groove 10 larger than A is used.

After stacking the caisson 11 at a predetermined position, the fin-like bodies 1C, 1 are placed between the grooves 10, 10 facing each other.
Insert the waterproof material 1 with C in close contact in the direction of the back of the paper as shown in the figure to obtain the state shown in FIG. 4.

This insertion can be easily performed because the fin-like body 1C is in a folded state.

Next, if there is no water around, water is poured into the groove 10 to dissolve the water-soluble substance 2, and the fin-like bodies 10C, 10C elastically return to their shape as shown in FIG. The opening 10A is closed from the inside.

Thereafter, as shown in FIG. 5, by filling the groove 10 with concrete 12 and allowing it to harden, watertightness between the two caissons 11 is achieved.

In addition, when the fin-like body 1C is made of water-swellable rubber, the fin-like body 1C itself expands within the groove 10 after the water-soluble substance 2 is dissolved, as shown in FIG. It's good that it has been improved.

〔effect〕

As explained above, in this invention, even if it is a pre-formed caisson etc., the water stop material 1 is later expanded and deformed within the groove 10, so that reliable watertightness is achieved from the inside of the groove, and Since both the caisson and other structures and the water-stopping material 1 are manufactured in advance at a factory, it is easy to control the shape accuracy, and together with this, the practical effect of making extremely watertight construction possible is achieved. have

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of embodiments of this invention;
FIGS. 3 to 6 are explanatory views of the operation of the embodiment of this invention, and FIGS. 7 and 8 are explanatory sectional views of the conventional example.

Claims (1)

[Claims for Utility Model Registration] (1) It has an enlarged cross-sectional part that fits into the deep part of the groove and has a cross-sectional shape that is larger in the inner part than the opening, and a narrow cross-sectional part that passes through the opening. , a fin-like body that can cover the opening from the inside is integrally extended at the boundary between the enlarged cross-section and the narrow cross-section in the deep part of the groove, and the fin-like body is connected to the enlarged cross-section. It is forcibly bent along the outer periphery of the cross section and adhered with a water-soluble substance.
A waterproof material made entirely of rubber-like elastic material. (2) The water stop material according to claim 1, wherein the fin-like body is formed of a water-swellable substance.