JPS6261555B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adhering a sealant to the surface of concrete structures at joints, joints, etc.

2. Description of the Related Art In construction work on waterways, fence culverts, etc., a sealing material 2 is interposed between concrete structures 1, 1, as shown in FIG. 1, for example, for the purpose of water stoppage. In this case, the sealing material 2
In addition to elastic and watertight materials such as rubber,
So-called water-swellable rubber, which has the property of expanding when it contains water, is used, and the water path between the structures 1 and 1 is blocked by the elasticity and water-swellability of these materials. It is an object.

In addition, this sheet material 2 does not fully demonstrate its function if it is simply placed between the structures 1 and 1, so it is attached to the structure using a rubber adhesive such as butyl rubber, natural rubber, or SBR, or concrete nails. It is being fixed to the surface of

However, in such cases, the condition of the concrete surface is not always in good condition. For example, the surface may be unbearably wet or have a rough and non-uniform composition, so-called jyanka. In such cases, the water-stopping function of the sheet material is significantly reduced.

For example, when considering the effect of the elasticity of rubber etc. on the concrete surface, the deformation caused by the elasticity cannot respond to sudden changes in the concrete surface, so if there are severe irregularities or narrow holes, the space will be It cannot be completely sealed, causing water to leak. This point is exactly the same in the case of water stopping depending on water swelling property.

In addition, under such concrete surface conditions, adhesives do not adhere well; in particular, the above-mentioned rubber adhesives have extremely high viscosity, so they cannot penetrate into severe unevenness or narrow holes. These cannot be sealed. Furthermore, when concrete nails are used, cracks and cracks are likely to occur, which may even encourage water leakage.

This invention was made to solve the above-mentioned conventional problems regarding seals between concrete structures. Even in the worst case, a completely water-tight state can be obtained. EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be described in detail based on the illustrated embodiment.

In this invention, a molten resin 14 is applied to a concrete surface 11 to make the surface 11 uniform and smooth, and then a sealing material 12 is bonded to the surface via a rubber adhesive 13.

The resin 14 is preferably made mainly of epoxy resin, etc., and a curing agent such as polyamide resin is mixed with a liquid or paste intermediate of the above resin, and the mixture is applied to the concrete surface 11 with a brush or the like, or by spraying it. Apply. In addition, for example, cement-based materials are mixed with polymeric materials such as epoxy resins, and a hardening agent is mixed with this to create a concrete surface.
It can also be applied to 1. On the other hand, as the rubber-based adhesive 13, it is suitable to use adhesives such as unvulcanized natural rubber, butyl rubber, SBR, etc., which have high adhesive performance and are easily deformed to some extent.

The resin 14 is preferably applied to a certain degree of thickness;
Moreover, it is preferable to make the surface as smooth as possible. The rubber adhesive 13 is applied to the sealing material 12 in advance, the adhesive surface is covered with a release sheet, etc., and brought to the construction site, and after the resin 14 is applied,
It is appropriate to peel off the release sheet and adhere it to the surface of the resin 14. The rubber adhesive 13 can be applied before the resin 14 hardens, and the adhesive 13 adheres as the resin 14 hardens.

Rubber adhesive 13 is usually applied to both sides of the sealing material 12, and these are adhered to the opposing surfaces of the concrete structure to be connected to each other, and the space between them is bonded as shown in FIG. Seal. The other side may be bonded directly to the concrete surface or, if the surface is in poor condition, using the method according to the invention.

When bonding such a sealant 12, the sealant 12 is bonded to the existing concrete surface 11 by the method according to the present invention, and then the other bonding surface is exposed and the next structure is poured there. Construction work called tsutsugi is often performed. In this case, the rubber adhesive 13 adheres to the surface of the concrete as it hardens and dries. However, in this case, concrete debris, sand, and other dust often adhere to the adhesive surface before concrete is placed, which may significantly reduce the adhesive force. If this happens, even when the concrete hardens, it will not adhere completely and the desired water-stopping function will not be achieved.

Therefore, in such cases, it is best to use a thin sheet 15 made of something that easily dissolves in water, such as starch or gelatin, instead of a release sheet, and pour concrete while covering the adhesive surface with this sheet. good. While the sheet described above prevents dust from adhering to the adhesive surface before concrete is poured, it also dissolves due to moisture when concrete is poured, so it does not interfere with adhesion. ,
Good adhesion can be obtained.

When the concrete surface 11 is covered with the resin 14 in this way, the resin 14 completely fixes the concrete surface 11, so the water that comes out from inside is stopped and the surface of the resin 14 is left in a dry state. be able to. At the same time, the molten resin has lower viscosity than rubber-based adhesives and has a higher penetrating effect, so it can penetrate even when the concrete surface is extremely uneven or has narrow holes. You can completely block it by doing this.

However, the resin 14 does not exhibit the same flexibility as the rubber adhesive 13 after it has hardened, and may peel off when misalignment occurs between concrete structures due to uneven settlement. It will end up being put away.
Therefore, the sealing material 12 is bonded to the resin 14 via the rubber adhesive 13.
By doing so, even if a shift occurs between the concrete structures, it is possible to sufficiently follow this shift, and at the same time, a strong adhesive state can be realized.

As described above, according to the method of the present invention, the sealing material 12 can be held between concrete structures by compensating for the respective drawbacks of the resin 14 and the rubber adhesive 13. A highly durable seal can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a water-stopping structure at the joint of a concrete structure, and FIG. 2 is an explanatory diagram showing an adhesive state achieved by the adhesive method according to the present invention. 11... Concrete surface, 12... Sealing material, 1
3...Rubber adhesive, 14...Resin.

Claims (1)

[Scope of Claims] 1. A method for adhering a sealant to a concrete surface, comprising applying a molten resin to the surface of the concrete, and then adhering the sealant to the surface via a rubber adhesive. 2. The sealant bonding method according to claim 1, wherein the resin is a liquid or paste epoxy resin intermediate mixed with a curing agent.