JPS6255352A - Water stopping material - 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 The present invention relates to a waterproofing material, in particular a waterproofing material for making gaps between concrete and concrete or between concrete and metal, plastics, rubber or wood watertight.

It is well known that the bond between concrete and metal, plastic or wood, or even concrete itself, is not good. When a metal pipe or a plastic pipe is embedded, or when a metal window frame is joined to concrete, an inevitable gap is created between the concrete and the other concrete or metal or plastic molded product.

For this reason, various countermeasures have already been considered.1 For example, in the concrete joint area, a board made of rubber, PVC, or metal called a water stop plate is buried parallel to the joint direction, or the joint surface is A method of embedding rod-like bodies made of recycled butyl rubber along the sides of the windows is used, and a method of filling gaskets or caulking agents between the metal window frame and the concrete window frame is also adopted. However, since concrete has the property of self-shrinking, it is unavoidable that the amount of gaps gradually increases as time passes, even if it is negligible at first. Furthermore, although rubber materials such as unvulcanized butyl recycled rubber are resistant to the alkali of concrete, once the surface becomes dusty, it will no longer adhere to ready-mixed concrete, which poses many difficulties in on-site construction.

As summarized above, the problem of waterproofing in concrete structures remains an unresolved problem in the civil engineering and architectural fields even today, especially when large water pressure is applied to structures such as tunnels, subways, basements, culverts, and water tanks. This is especially true in the field.

In recent years, the application of water swelling agents to waterproofing of concrete has come to be considered.
As described in Publication No. 11, a W-side water-stopping material has been proposed in which the periphery of the core material on which the M-moisture material sits is covered with non-woven fabric, woven fabric, or a water-impermeable film with perforations. Since it does not adhere to concrete, the bonding strength may be weakened.The present invention attempts to solve the above-mentioned problems in known swellable waterstop materials by using a carrier in combination.

The gist of the present invention resides in a water-stopping material containing a hydrophilic swelling agent around and/or inside a main material made of elastic rubber, unvulcanized rubber, or plastics. Here is "hydrophilic swelling agent"
This is because water-swelling substances refer to hydrophilic polymeric substances that have the property of forming a sol and swelling when they come in contact with water, such as polyacrylic acid or its alkali metal salts.
If desired, it is applied to the main materials described below together with a suitable binder.

The "r main material" as used in the present invention is mainly used for the purpose of waterproofing (water stoppage), airtightness, vibration proofing, soundproofing, etc. in civil engineering construction work, and is mainly used between concrete and concrete or between concrete and metal.
It means a shaped object made from elastic rubber, unvulcanized rubber, or plastics that is interposed at the interface between plastics, rubber, or wood, such as water stop plates, water stop strips, gaskets, etc. The material constituting the zero main material belonging to this category may be dense or coarse, but it should have at least enough strength to support the parent wood swelling agent.

In the present invention, the hydrophilic swelling agent is usually applied in a layered manner around the entire periphery or part of the periphery of the main material, which is the carrier. However, if desired, small holes or slits made around the main material may be filled with the material.

The *@ agent present around or inside the main material does not flow out due to pressure, but when water enters, it immediately expands to more than 10 times its dry size to prevent water from entering. For this reason, the use of swelling agents is very effective in stopping water in areas where continuous water intrusion is expected. In addition, when the swelling agent is dried,
Since it becomes a thin film, it is useful not only for waterproofing but also for protecting the surface of the main material.For example, unvulcanized raw rubber or recycled rubber has good adhesion to raw concrete or mortar, so its rod-like shape is commercially available under the name Spanseal ■ to stop water at concrete joints, but if dust adheres to the surface, it loses its adhesive ability, so always cover the surface with a separator and remove the separator just before use. There was a need.

However, if the rod-shaped body is covered with a swelling film according to the present invention, the separator is naturally dissolved and absorbed by the moisture in the fresh concrete, etc., so there is no need to apply or remove a special separator, which is extremely convenient. It's convenient.

Hereinafter, the first invention will be explained in more detail with reference to specific examples.

FIG. 1 shows an example in which a layer 0 of a hydrophilic swelling agent is applied to the entire surface of a flat water stop plate (1) made of synthetic resin. When this is used in the pouring area of concrete as shown in Figure 2, the swelling agent layer on the surface of the water stop plate O) swells when it comes into contact with the water in the concrete, forming a sol layer. A sol layer is formed along the interface (2) between the first pouring part (2) and the zeroth pouring part (2) to prevent the flow of water. For this reason, even if the raw material fresh concrete contains a little more moisture, the formation of water channels is prevented.
Its water stopping effect is very good. The above explanation is an example of water stopping at a simple pouring joint, but of course it can also be used for expansion joints, which is the original purpose of the water stopping plate, and in this case also, porous filler and water stopping are used. A sol layer is formed between the board and the concrete and the water stop plate, so the water stop effect is complete.

FIG. 3 shows an example in which the swelling agent (2) is applied along the arcuate surface (6a) of the semicylindrical gasket (6).

As shown in Figure vJ4, after pasting these to the end faces of two PC boards ■ and ■', when the two PC boards are butted together, the swelling agent 0 and ■ will cause some clearance between the opposing parts of both gaskets. Completely prevents rainwater from entering. Therefore, according to the construction method using this gasket, a sufficient waterproofing effect can be obtained even without caulking, so that the troublesome cost of caulking can be omitted or saved. Furthermore, if the end surface of the PC board is smooth, one gasket can even be omitted.

Figure 5 shows a state in which the inside of the foot gasket ■ is filled with a polyurethane foaming agent ■ and a foaming aid 0, each encapsulated in a capsule.In this case, the swelling agent ■ is also coated on the entire circumference of the gasket. be done. When in use, insert the foot into the groove on the end surface of the PC board and then apply a blow to the top of the arcuate surface to break the capsule and cause foaming. Therefore, when this gasket is used at the connection end of a PC board, etc., not only a sufficient pressure-contact condition can be obtained, but also good sound insulation is achieved because the inside of the gasket is filled with porous resin. If desired, a curing retardant may be added to the foaming aid (1) to allow curing to occur after an appropriate working time.For example, foaming may be performed using a nichrome wire or fuse wire with solvent-adsorbed polystyrene sealed inside. In the case shown in FIG. 6, a swelling agent layer (2) is provided on the arcuate surface of the gasket (6) similar to that in FIG. This is an example in which microcapsules (12) containing cyanoacrylate are loaded between the hook-shaped or mushroom-shaped protrusions of the tape. This gasket is adhered to the end surface of a PC board or the like to which a looped tape (not shown), which is one type of surface-adhesive tape, is adhered. According to this method, the installation of the gasket is much faster than the conventional operation of attaching the gasket to a semi-dry rubber adhesive layer, and the shaping after adhesion is also much easier. be. After complete alignment, a blow to the arcuate surface destroys the lower capsule and provides complete adhesion. In addition, the other tape with loops attached to the end face of the PC board, etc. acts to correct the unevenness of the concrete surface to a certain extent, so it can be directly applied to the PC board.
The bonding condition is much better than when bonding to a C plate or the like. Therefore, this gasket installation method is particularly suitable for work at high places.

Figure 7 shows a square core of unvulcanized recycled butyl rubber (main material) (
13) This is an example in which a film (■) of a swelling agent layer is provided around the material.This material is plastic and is used to stop water at concrete joints, etc., but since it has a film (■) as an outer covering, it is susceptible to dust. There is no need to take into account the total heat of the film.
) is deformed and torn to expose its contents, while some of it is also absorbed into the main material, so it not only does not pose any problem to the adhesion of (13) and concrete. When exposed to moisture, it creates a sol layer that fills the gap between the concrete and the main material, providing a water-stopping effect that is even better than when using only the main material.

Figure 8 shows a square closed-cell plastic sponge rod (1
This is an example in which the swelling agent (■) is applied around 8).

This type is also used to stop water, but unlike the type shown in the previous three figures, it has the advantage of not being easily deformed when concrete is poured.

FIG. 9 is similar to that in FIG. 8, except that an open-cell sponge (18) is used as the main material. In this case, since the amount of swelling agent adsorbed to the main material is large, the main material expands even when there is a large amount of spring water, and the water path can be blocked.

In Figure 10, a large number of small holes (21) are bored in the circumferential surface of a square piece (20) made of elastic rubber, and w? llI agent■
This example is shown in which the concrete is not easily deformed by pouring concrete, and has the characteristics of the one shown in Fig. 8 and the one shown in Fig. 9 in that it contains a large amount of swelling agent.

The rod-shaped bodies described above in Figures 7 to 10 are water-stopping materials used in civil engineering, such as concrete joints, penetration pipes, joints between humid pipes and culverts, and H-shaped steel support piles. Although this is the basic form, it has many other uses such as gable walls, joints, overlapping parts of roofing materials, and water stops at the joints of car terrace floors. And depending on these uses, the shape is
! There is no need to explain that it should be changed into a shape (for example, lens shape, plate shape, tapered shape, U shape, etc.). The presence of an encapsulated adhesive or W/e3 agent around or around and inside is the main focus of the invention.

Therefore, the examples are not intended to limit the technical scope of the invention.

As mentioned above, the present invention has great industrial value because it can solve the conventional problems in the wood stoppering method by simple means.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a water stop plate showing the state in which the invention has been applied to a flat water stop plate, and Figure 2 is a cross-sectional view of a flat water stop plate showing the state in which the invention has been applied. A sectional view similar to Fig. 1 showing an example, Fig. 3 a cross-sectional view of a gas goot to which the present invention is applied, and Fig. 4 showing a state in which the gasket shown in Fig. 3 is brought into contact with the end face of a PC concrete plate. A sectional view similar to FIG. 3, FIG. 5 a cross-sectional view showing another embodiment of the invention for a gasket with a foot, FIG. 6 a cross-sectional view showing another embodiment of the invention for a gasket, and FIG. 7. 8 is a cross-sectional view showing the application of the invention to a rectangular rod-shaped body of unvulcanized rubber;
Figures 1 to 10 are cross-sectional views showing embodiments of the invention for a closed-cell foam, an open-cell foam, and a rectangular rod-shaped body made of elastic rubber. As follows: □ l: Water stop plate 2 swelling agent (layer), 2': Sol layer, 3: Primary pouring part. 4: Secondary pouring section 5: New and old concrete interface 6: Gasket, 7.7°: PC concrete plate 8: Gasket with foot, 9: Foaming base agent capsule, 10: Foaming aid capsule, 11: Interview right type fastener 12 - Adhesive containing microcapsules, 13: Unvulcanized rubber square water stop rod, 18 - Square closed cell sponge, 19: Square open cell sponge, 20: Square elastic rubber, 21 : Small hole. Patent applicant ARAO Co., Ltd. Figure 1 Figure 2 Figure 4z Figure 72 Figure 80 Figure 2 Stem ROM September 25, 1988

Claims (2)

[Claims] (1) A water-stopping material characterized by containing a hydrophilic swelling agent around and/or inside a main material made of elastic rubber, unvulcanized rubber, or plastics. (2) The water stop material according to claim 1, wherein the main material is plate-shaped, rod-shaped, or hollow.