JPS6363696B2 - - Google Patents

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, plastic, rubber or wood watertight.

It is well known that the bond between concrete and metal, plastic or wood, or even concrete itself, is poor. For example, when patching concrete, connecting frames, embedding metal or plastic pipes in concrete, or joining a metal window frame to concrete, the concrete and the other concrete Or an unavoidable gap is created between the metal or plastic molded product.
For this reason, various countermeasures have already been considered, such as using rubber for concrete joints,
Methods of embedding a PVC or metal water stop plate parallel to the splicing direction, or embedding a rod-shaped body made of butyl recycled rubber along the splicing surface, and metal A method is used in which a gasket or caulking agent is filled between the window frame and the concrete window frame. However, since concrete has self-shrinking properties, it is unavoidable that the amount of gaps gradually increases over time, 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 dust adheres to the surface, it will no longer adhere to ready-mixed concrete.
On-site construction involves many difficulties.

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

Recently, the application of water swelling agents to the waterproofing of concrete has come to be considered. A swelling waterproof material coated with a perforated impermeable film has been proposed, but since the coating itself does not adhere to concrete, it may actually weaken the joint strength.

The present invention particularly aims to solve the above-mentioned problems in known water stopper materials made of unvulcanized rubber by using a hydrophilic swelling agent in combination.

The water stop material according to the present invention is characterized by comprising a hydrophilic swelling agent layer on the surface of a main material made of unvulcanized rubber.

"Hydrophilic swelling agent" here means, for example, polyacrylic acid or an alkali metal salt thereof,
Refers to a hydrophilic polymer substance that has the property of forming a hydrated gel and swelling when it comes into contact with water.

The "main material" referred to in the present invention is used mainly between concrete and concrete, or between concrete and metal, plastics, rubber, or wood, for the purpose of waterproofing (waterstopping), airtightness, vibration isolation, soundproofing, etc. in civil engineering construction work. A plate-shaped or rod-shaped material made of unvulcanized rubber that is interposed at the interface between
For example, water stop plates, water stop strips, gaskets, etc. belong to this category.

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. The swelling agent present on the surface of the main material immediately expands to more than 10 times its dry size when it comes into contact with water, thereby preventing water from entering. Therefore, the use of the swelling agent is very effective in stopping water in places where continuous water intrusion is expected. Since the swelling agent becomes a thin film when dried, it is useful not only for preventing water but also for protecting the surface of the main material.
For example, unvulcanized raw rubber or recycled rubber has good adhesion to fresh concrete or mortar, so its rod-like bodies are commercially available under names such as Spanseal for water-stopping at concrete joints.
If dust adheres to the surface, the adhesion ability is lost, so it was necessary to always cover the surface with a separator and remove the separator immediately before use.

However, according to the present invention, the layer of hydrophilic swelling agent present on the surface of the rod acts as a separator and also acts as a sealing material during construction, so it is not necessary to use a special separator like known water-stopping materials. There is no need to apply or remove it, making it extremely convenient in practice.

Hereinafter, the invention will be explained in more detail using specific examples.

FIG. 1 shows an example in which a layer 2 of a hydrophilic swelling agent is applied to the entire surface of a flat water stop plate 1 made of unvulcanized rubber. When this water stop plate is used at a concrete joint as shown in Fig. 2, since the water stop plate 1 is made of unvulcanized rubber, it can be deformed so as to come into close contact with the uneven surface of the target structure, and the surface The swelling agent layer contacts moisture in the concrete and swells to form a hydrated gel layer 2', and a part of it swells at the interface 5 between the primary pouring section 3 and the secondary pouring section 4. The gel layer 2' is also formed along the surface to prevent water from flowing. For this reason, even if the moisture content of the raw raw concrete is somewhat high, the formation of water channels is prevented, so the water-stopping effect is very good. The above explanation is an example of water stopping at a simple joint, but of course it can also be used for expansion joints, which is the original use of the water stopping plate.

FIG. 3 shows an example in which a swelling agent layer 2 is provided around a square core material (main material) 6 made of unvulcanized recycled butyl rubber.
In this case as well, the main material itself is plastic, and it comes into close contact with uneven surfaces such as concrete joints, and the swelling agent layer 2 on the surface encounters moisture in the concrete to form a hydrated gel layer. By filling the gap remaining between the two, it achieves a better water-stopping effect and prevents dust from adhering to the surface of the main material.

The water-stopping materials exemplified above are the basic form of water-stopping materials used in civil engineering applications, such as for concrete joints, as well as around penetration pipes, joints between humid pipes and culverts, and for H-shaped steel support piles. However, it has many other uses, such as water-stopping at gable walls, joints, overlapping roofing materials, and curtain wall joints. It goes without saying that the shape should be changed to an appropriate shape (for example, lens shape, plate shape, tapered shape, U shape, etc.) depending on the intended use. In any case, since the main focus of the invention is the presence of a hydrophilic swelling agent on the surface of the main material made of unvulcanized rubber used for waterproofing, the examples do not limit the technical scope of the invention in any way. isn't it.

As described above, the present invention has great industrial value because it can solve the conventional problems in water stoppage construction methods 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 is applied to a flat water stop plate, and Figure 2 is an application of the water stop plate shown in Figure 1 to stop water at a joint in concrete. A sectional view similar to FIG. 1 and FIG. 3 showing an example of
FIG. 2 is a cross-sectional view showing the application of the invention to a rectangular rod-shaped body made of unvulcanized rubber. In the figure, the meanings of the main symbols are as follows: - 1: Water stop plate, 2: Swelling agent layer, 2': Gelled layer,
3: Primary pouring section, 4: Secondary pouring section, 5: New and old concrete interface, 6: Unvulcanized rubber square water stop material.

Claims (1)

[Scope of Claims] 1. A water-stopping material characterized by comprising a hydrophilic swelling agent layer on the surface of a main material made of unvulcanized rubber. 2. The water stop material according to claim 1, wherein the main material is plate-shaped, rod-shaped, or hollow.