JPS61286445A - Water proof construction method of wet body - 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 construction method for waterproofing the rooftops and floors of buildings in wet conditions, or the floors of playgrounds and the like.

(Prior Art) In conventional waterproofing methods, when a concrete structure is in a wet state, waterproofing is generally carried out after most of the water in the concrete has evaporated. This is because if a coating film or sheet waterproofing is applied when the building structure is wet, the water in the building body not only inhibits the adhesion between the building block and the waterproof layer, but also becomes water vapor over time, causing the building block and the waterproof layer to bond together. This is because they collect at the interface with the waterproof layer, leading to defects such as blistering of the waterproof layer.

When applied to the surface of a building structure in the field of underground construction or civil engineering, the waterproofing material for Dorun structures penetrates into the voids of the structure, causes a chemical reaction inside, and crystallizes, making the structure itself dense and providing waterproof properties. So-called penetrating waterproofing materials are well known. However, when these known penetrating waterproofing materials are applied to the surface of a leaking body for rooftop waterproofing of a building, and a waterproof sheet or waterproof coating layer is further laminated on top of that, it is true that in the initial stage, the water-repellent structure and the waterproof sheet are Alternatively, although the adhesion to the waterproof coating layer is good, it has not been possible to completely prevent partial blistering of the waterproof layer over time. This is thought to be due to the fact that the moisture present in the structure and the penetrating waterproofing material are unable to completely trap moisture within the crystals and prevent it from being released, no matter what the moisture content of the structure. . Particularly in waterproofing construction of buildings, there is a significant difference in the moisture content in the building structure immediately after rain and after several days have passed, so problems are likely to occur in such cases.

(Problems to be Solved by Jl! Ming) This invention aims to provide a waterproofing method for water-filled structures without worrying about the amount of water in the structure.

(Means for Solving the Problems) The present application applies a known penetrating waterproofing material to the surface of a water-resistant structure, then applies a highly modified adhesive in an uneven pattern, and then laminates and pressure-bonds the waterproof sheet to form a waterproof sheet. A ventilation and diffusion path is formed between the membrane and the structure coated with the penetrating waterproofing material, and even if the moisture trapped in the penetrating waterproofing material gathers as water vapor at the interface with the waterproofing sheet, it will not be formed in an uneven shape. This is intended to prevent deterioration of waterproof performance due to peeling or blistering of the waterproof sheet over a long period of time by allowing air to diffuse out of the system through the concave portions of the adhesive.

As the penetrating waterproofing material used in this application, all known organic, inorganic, or inorganic/organic mixed type penetrating waterproofing materials can be used, but organic or inorganic/organic mixed waterproofing materials are suitable for adhesive properties with far-modified adhesives. A mold is preferable. In particular, Bond E-20
0 (manufactured by Konishi Co., Ltd.), Ebonitsuke EP #910 (manufactured by Nippon Chemical Construction), Double Coat S (manufactured by Sanyo Chemical Industries), Fine Sealer Primer #9 (manufactured by Nippon Additive Industries) Heidi (manufactured by Mitsui Petrochemical Industries) etc. are suitable.

These penetrating waterproofing materials can be used alone, but they can also be mixed with other resins, rubber, etc. to give them stretchability and elasticity that can accommodate the deformation of the building structure.

It is possible to improve adhesion. or.

When the temperature and humidity of the structure is high or when the viscosity of the permeable waterproof material is high, an organic solvent having an affinity for water of about 5%, such as acetone, methyl ethyl ketone, alcohol, etc., can be mixed.

The amount of penetrating waterproofing material applied to the building structure is usually 0.2 to 3K.
g/j is suitable, but if the surface of the building structure has many cracks or significant unevenness (irregularities or steps), it is desirable to increase the amount of coating.

A far-modified adhesive that is applied to the surface of the penetrating waterproofing material in an uneven pattern to bond it to the waterproof sheet and to form ventilation and diffusion channels is 1. A synthetic resin or rubber adhesive with a large amount of filler. Alternatively, an adhesive may be used which has the property of retaining its shape when applied in an uneven manner by mixing a small amount of a metastatic filler or by other methods. The highly modified adhesive may be of a foaming type; for example, a foamable urethane adhesive that does not contain a cell regulator is preferred because it has a highly modified nature and the formation of irregularities becomes more pronounced due to foaming.

This is a method for applying a highly modified adhesive in an uneven pattern.

For example, any known method can be used, such as using a spatula or trowel with combs, rotating a roll with desired unevenness over the adhesive coating surface, or spray painting through a mesh screen. The uneven pattern is often corrugated or burr-like.

A tortoiseshell pattern or the like may be selected as appropriate.

The waterproof sheet used in this application is a sheet made of a single material such as a polymeric material such as synthetic resin or rubber, or a manufactured material such as asphalt, or a foamed material made of rubber or synthetic resin with these waterproof materials. A material that is laminated and integrated with the body or fabric is used.

Hard urethane foam, especially when used on the roof of a building.
If a material laminated with a heat insulating material such as polyethylene foam, styrene foam or glass wool is used, it is possible to impart not only waterproof properties but also heat insulating properties, which is desirable from the viewpoint of energy saving. When using these laminated waterproof sheets, the fabric or heat insulating material and the waterproof sheet may be pasted together with adhesive before installation, or the fabric or heat insulating material may be bonded with a highly modified adhesive. After adhering to the building frame, a waterproof sheet may be pasted on top of it.

Note that a known desorption cylinder can be provided if necessary.

(Example) Examples 1 to 5 An asbestos slate plate having a thickness of 81111 g was immersed in water for 24 hours to fully absorb water. This asbestos slate board was taken out of the water, the surface was wiped with a dry cloth, and various hydrophilic primers shown in Table 1 were applied to the asbestos slate board and the peel strength was compared against the moistened asbestos slate board. I checked the suitability. The results are also listed in Table 1. The peel test is J
Measurements were made 24 hours after application using a test piece width of 10 mm in accordance with the method using a tanzag-shaped test piece described in IS 86301.

Example 6 Moisture content is 15% and the thickness is 15 with water droplets still attached to the surface.
Eponitsuke #91O tested in Example 5 was mixed with base agent/accelerator/curing agent = 100/150150 on one side of 5QOmn+ corner warm concrete with ++v+, and 1rrr.
Eponitsuke #910 was applied with a roll at a rate of 1 kg per coat and left for 6 hours to harden.

Next, an isocyanate prepolymer (P) containing 10.1% of free isocyanate obtained by reacting diphenylmethane diisocyanate with bifunctional polypropylene glycol having a molecular weight of 2000 and 100 parts by weight of bifunctional polypropylene glycol having a molecular weight of 2000 are added. 4.4-diaminophenylmethane 2.5 parts by weight, triethylenediamine 0
．． A urethane foam adhesive prepared by mixing a liquid (R) of 1 part by weight and 1 part by weight of water in a 1:1 ratio,
Using a spatula with combs of 5n+m pitch, the foam was applied in an uneven manner so that the thickness of the convex portion after foaming was about 10 mm.

When this urethane-based foam adhesive is still sticky after the foaming reaction, it has a thickness of 15 mm and a foam density of 50.
1 ic of asbestos paper on both sides of the hard urethane foam on the floor
ill J! The insulation boards were stacked together and lightly pressed together to harden.

On top of this, use neoprene adhesive to obtain a commercially available thickness of 1,
A 2mm EPDM rubber waterproof sheet was laminated.

The test specimen thus obtained was allowed to stand for more than 24 hours and then heated in an electric constant temperature bath at 80° C. for 24 hours, but no abnormalities such as blistering of the waterproof sheet were observed.

Comparative Example 1 A test specimen was prepared in the same manner as in Example 6, except that the warm air curing type Soflan primer used in Example 2 was used instead of Ebonike #910, and it was applied to a uniform thickness on the warm concrete surface. . When this test piece was heated at 80° C. for 24 hours, it was observed that blisters with a diameter of 40 to 50III+ had occurred in some places on the surface of the waterproof sheet.

(Effects of the invention) ■Since the penetrating waterproofing material is applied to the surface of the building structure, the penetrating waterproofing material penetrates into the voids in the building structure, causes a chemical reaction inside the building body, crystallizes, and densifies the building structure itself, making it waterproof. It has the effect of improving adhesiveness with highly modified adhesives.

■Even if the water content in the building structure is in excess of the amount that would cause crystallization through a chemical reaction with the penetrating waterproofing material, the far-modified adhesive is applied in an uneven pattern to form ventilation and diffusion channels. Since the water vapor released from the penetrating waterproofing material layer over time can be easily discharged out of the system through the ventilation and diffusion path, there is no risk of blistering due to peeling of the waterproofing sheet layer even after long-term use. can be prevented from occurring.

■Since the highly modified adhesive is applied in an uneven shape and the waterproof sheet layer is laminated and pressure-bonded before the adhesive has completely cured, even if there are unevenness or steps, or uneven surfaces, on the building frame, the waterproof sheet layer Since this can be adjusted by pressure welding, construction is easy even on highly uneven structures.

■Waterproofing Sheet 1 If a composite material is used as one layer with insulation material, it can be used not only as waterproofing but also as a combined construction method of insulation and waterproofing, which can have an energy saving effect. It can also have a protective effect.

Since the present invention has the above-mentioned excellent effects,
It can be used not only as a waterproofing method for newly constructed buildings, but also when there is roughness due to peeling off of a waterproof sheet or waterproof layer applied to the surface of a building frame for renovation or repair purposes. or,
The problem of postponing waterproofing work due to rain, which used to be the biggest problem in delaying the construction period, can now be started immediately after the rain has stopped, even if there is a small puddle of water, minimizing delays in the construction period. In addition to waterproofing buildings, it can also be used for construction of playground floors and underground passages.

It can be said that this is a useful technology that can be used in a wide range of applications as a construction method for waterproofing work in areas where structures are prone to leaking, such as concrete and water tanks.

Claims (1)

[Claims] A method of waterproofing a water-filled building structure, which is characterized by forming a permeable waterproofing membrane layer on the surface of the building body in a wet state, applying a highly modified adhesive on the permeable waterproofing film layer in an uneven pattern, and then laminating and press-welding a waterproof sheet. .