JPH11152860A - Water-proof method and structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-proof method with a uniform coat thickness as specified and an excellent water-proof property. SOLUTION: In a water-proof method of applying plural synthetic high polymer sheets in array to a backing and then applying an urethane water-proof coat A thereon, a joint between both ends of a sheet is coated with a reinforcing cloth. A water-proof coat B is applied on the reinforcing cloth to be impregnated therewith and then the urethane water-proof coat A is applied on the whole synthetic high polymer sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method for use on an exposed floor, such as a building roof, a balcony, a veranda, an open corridor, etc., which requires waterproofing.

[0002]

2. Description of the Related Art Conventionally, as a waterproofing method for the above-mentioned exposed floor use, a sheet waterproofing method in which a synthetic polymer sheet made of rubber, vinyl chloride resin, ethylene vinyl acetate resin or the like is adhered to the surface of a concrete body with an adhesive. And a urethane-based two-liquid waterproofing material that is mixed and applied on site to apply a coating film waterproofing method.

[0003] These methods are easier to construct than the asphalt waterproofing thermal method, but the sheet waterproofing method has poor watertight reliability at the joints between the ends of the sheet. There is a problem that the waterproof coating method can seamlessly finish the entire waterproof layer without any seam. However, there is a problem that it is not easy on site to determine whether the specified film thickness can be secured uniformly.

That is, in the sheet waterproofing method, since the sheet is formed into a prescribed shape, a desired film thickness can be ensured only by splicing on site, and a waterproof layer can be formed without a curing curing period. However, chloroprene rubber-based, butyl rubber-based adhesives and other adhesives are used to bond the sheets together.
The watertightness was not always perfect due to the shift movement due to the movement of the groundwork. In addition, the adhesion between the sheet and the surface of the concrete frame was affected by many factors such as insufficient adjustment of the groundwork, insufficient kneading of the adhesive, insufficient amount of application, and incorrect timing of bonding, and adhesion failure was likely to occur.

[0005] In the coating waterproofing method, the two liquids are prepared and agitated on site and applied with a trowel or the like, so that there is no joint in the sheet waterproofing method, and the entire surface is seamless, that is, an integral waterproof layer can be formed on the entire surface. . In addition, since the coating film is formed while reacting and curing, the adhesiveness with the base is excellent. It was unknown whether it was secured uniformly.

[0006]

Therefore, a composite construction method in which a synthetic polymer sheet and a urethane coating waterproofing material are double-laminated in order to make up for both of these drawbacks is conceivable. That is, a method in which a synthetic polymer sheet is attached to a base, and a urethane coating waterproof material is laminated thereon. In this case, various problems occur because the method of applying a thin film-like adhesive tape and coating a urethane coating waterproof material thereon is applied to the joint between the sheet ends.

First, if it is raining immediately before the urethane coating waterproofing material is applied, the waterproofness of the joint becomes insufficient, and rainwater may enter through a gap between the sheet and the adhesive tape. Next, when a urethane coating waterproofing material containing a solvent is applied on the pressure-sensitive adhesive tape, the solvent swells the pressure-sensitive adhesive of the pressure-sensitive adhesive tape, and tends to cause curling and peeling of the pressure-sensitive adhesive tape.

[0008] Even if the urethane coating waterproofing material is safely applied, "blisters" due to evaporation of the moisture in the base concentrate in the gaps of the sheet joints, peel off the adhesive tape and push up the adhesive tape, Swelling is likely to occur at the joints. Furthermore, due to a temperature change or the like, the stress when the sheet shrinks is concentrated on the joint, and the urethane coating waterproof material is easily cut.

[0009]

The present invention is the following invention which has solved the above-mentioned problems. In a waterproofing method in which a plurality of synthetic polymer sheets are arranged side by side and adhered to a base, and a urethane coating waterproofing material (A) is applied thereon, a joint between end portions of the sheets is covered with a reinforcing cloth and further reinforced. A waterproofing method, comprising applying and impregnating a coating film waterproofing material (B) on a cloth, and then applying a urethane coating film waterproofing material (A) to the entire synthetic polymer sheet.

On the base, a synthetic polymer sheet layer which covers the base and is constituted by arranging a plurality of synthetic polymer sheets, and a urethane coating waterproof layer (a) which covers the surface of the synthetic polymer sheet layer are provided. In the waterproof structure, the waterproof structure covers the joint between the ends of the synthetic polymer sheet and is provided under the urethane coating waterproof layer (a). A waterproof structure comprising: the impregnated and cured reinforcing cloth layer of (b).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Synthetic polymer sheet] The material of the synthetic polymer sheet used in the present invention is not particularly limited.
Synthetic rubber-based or synthetic resin-based sheets are preferred. Examples of the synthetic rubber-based material include ethylene propylene copolymer (EPM), ethylene propylene diene terpolymer (EPDM), vulcanized butyl rubber, non-vulcanized butyl rubber, and chlorosulfonated polyethylene. Examples of the synthetic resin-based material include polyvinyl chloride and ethylene vinyl acetate copolymer. In addition, a rubberized asphalt sheet obtained by kneading asphalt into synthetic rubber can also be used.

Since the urethane coating waterproof material (A) is laminated, a synthetic rubber-based sheet having mechanical properties such as elongation similar to urethane resin is preferable. The thickness of the synthetic polymer sheet is preferably 0.2 mm or more and 3.0 mm or less. 0.2
If it is less than mm, the strength of the sheet itself will be insufficient and the reliability of waterproofness will be poor. If it exceeds 3.0 mm, it becomes difficult to handle the sheet in terms of flexibility and weight.

The above-mentioned synthetic polymer sheet can also be used by laminating a nonwoven fabric on both sides of the sheet. When a synthetic rubber sheet is used as the synthetic polymer sheet, it is particularly preferable to laminate a nonwoven fabric.

When a nonwoven fabric is laminated on the upper surface of the sheet, the urethane coating waterproof material (A) is applied to the nonwoven fabric on the upper surface of the sheet.
Is impregnated, so that the adhesion to the urethane coating waterproofing material (A) can be further improved. When a nonwoven fabric is laminated on the lower surface of the sheet, it plays a role of a ventilation layer that removes the adhesion to the base and the base moisture in the horizontal direction. That is, it is preferable that the sheet is applied by applying a urethane-based adhesive to the base, and in this case, when the nonwoven fabric is laminated on the lower surface of the sheet, the adhesive is appropriately impregnated into the nonwoven fabric and reacts and hardens. Therefore, it can be firmly adhered to the substrate.

The material of the non-woven fabric is preferably made of synthetic fiber, natural fiber, glass fiber, or a blend of these fibers. Specifically, vinylon, polyester, nylon,
Polypropylene, cotton, hemp and glass fibers.

When the nonwoven fabric is laminated on the upper surface of the sheet, the basis weight of the nonwoven fabric is preferably ²⁰ to 100 g / m ² , more preferably 30 to 70 g / m ² .
When the nonwoven fabric is laminated on the lower surface of the sheet, the basis weight of the nonwoven fabric is 100 to 300 g / m ² , more preferably 1 to 300 g / m ² .
It is preferably 50 to 300 g / m ² . When laminating the nonwoven fabric on the sheet, the nonwoven fabric may be adhered by an adhesive or the like.

[Sticking of Synthetic Polymer Sheet] In the present invention, a plurality of synthetic polymer sheets are arranged and attached to a base. When attaching the synthetic polymer sheet to the base, it is preferable to use an adhesive, and it is more preferable to use a urethane-based adhesive.

It is preferable that the edge of the sheet and the edge of the sheet do not overlap. That is, it is preferable to attach the sheet to the base such that the ends of the sheet are attached to each other. When the ends of the sheet are overlapped, the thickness of the joint at the end of the sheet becomes large, which may cause protrusions on the surface of the finally obtained waterproof structure, or a urethane coating waterproof material ( This is not preferable because the thickness of the waterproof coating layer (hereinafter, urethane coating waterproof layer (a)) obtained by curing A) may be uneven.

[Reinforcing Cloth] In the present invention, the joint between the ends of the sheet is covered with the reinforcing cloth. The reinforcing cloth used in the present invention is preferably made of a woven or nonwoven fabric. The material is preferably made of synthetic fiber, natural fiber, glass fiber, or a blend fiber thereof, and specific examples thereof include vinylon, polyester, nylon, polypropylene, cotton, hemp, and glass fiber.

The thickness is preferably 0.05 to 2.0 mm,
0.15 to 0.2 mm is more preferable. The width is 50-20
It is preferably 0 mm. If the thickness is more than 2.0 mm, it is not preferable because the finally obtained waterproof structure may cause protrusions or the thickness of the urethane coating waterproof layer may be non-uniform.

It is particularly preferable that the thickness of the reinforcing cloth is smaller than the thickness of the synthetic polymer sheet. The thickness of the reinforcing cloth is preferably 2/3 or less, particularly preferably 1/2 or less of the thickness of the synthetic polymer sheet. Further, the basis weight is preferably 25 to 400 g / m ² , and 30 to 100 g / m ^2.
g / m ² is more preferred.

The nonwoven fabric is particularly preferably a fine mesh. When the above-mentioned specific thickness and basis weight are selected as the reinforcing cloth, the waterproofness of the coating waterproofing material (B) to be applied and impregnated from above becomes appropriate, that is, the coating waterproofing material (B) Do not soak into the joint gap too much,
In addition, it is preferable because it sufficiently adheres to the upper surface of the sheet.

[Coating film waterproofing material (B)] In the present invention, the joint between the ends of the sheet is covered with a reinforcing cloth, and the coating film waterproofing material (B) is applied and impregnated on the reinforcing cloth. The coating film waterproofing material is a liquid material that can be cured to form a coating film. The waterproof coating material is preferably urethane. Further, a waterproof coating material having thixotropic properties is preferred. As the urethane-based coating waterproofing material having thixotropic properties, a urethane sealing material or a urethane coating waterproofing material for vertical surface use (for rising) is preferable. It is not preferable to use a coating film waterproofing material for a flat field that requires leveling properties, since the thickness cannot be secured on the reinforcing cloth and flows into the joint gap of the sheets to block air permeability between the sheets.

It is preferable that after coating the waterproofing material (B) on the reinforcing cloth covering the joint, it is further squeezed with a rubber roller or the like. As a result, the waterproof cloth (B) is impregnated into the reinforcing cloth without excessively penetrating, so that the reinforcing cloth sufficiently adheres to the joint after the curing of the waterproof film (B).

Immediately after this, the urethane coating waterproofing material (A) may be applied, or after curing, the urethane coating waterproofing material (A) may be applied. Preferably, the urethane coating waterproofing material (A) is applied after the coating waterproofing material (B) is hardened and partially or completely cured.

In the present invention, as described above, the waterproofness at the joints is improved by covering the joints between the ends of the sheets with the reinforcing cloth layer impregnated with the coating film waterproofing material (B) and hardened. Sufficient urethane coating waterproof material (A)
Does not swell even when the urethane coating waterproof material (A) is applied over even if it contains a solvent. Much more tolerable.

[Urethane coating waterproofing material (A)] The urethane coating waterproofing material (A) used in the present invention is a urethane-based liquid material which can be cured to form a coating film. A waterproof material (A) can be used. JIS-A6021
It is preferable to use a urethane coating waterproofing material (A) having a performance that meets the urethane rubber type 1 standard in (roof coating waterproofing material).

As such a urethane coating waterproofing material (A), there are a urethane coating waterproofing material for a flat place and a urethane coating waterproofing material for rising, which can be appropriately selected according to the application. It is preferable to use a urethane coating waterproofing material for flat fields. When the urethane coating waterproof material (A) is applied, the thickness of the coating is usually 1 to 5 mm, particularly 1.8 m.
It is preferably from m to 4 mm. In addition, the thickness is preferably such that the reinforcing cloth is completely covered.

[Waterproof Structure] An example of the waterproof structure of the present invention is shown in FIG. 1, but the present invention is not limited to this. Also,
An adhesive layer may or may not be provided between the base and the synthetic polymer sheet layer.

[Use] A feature of the present invention is that a waterproof structure having a uniform thickness and a high waterproof property without water leakage can be obtained. INDUSTRIAL APPLICABILITY The present invention is suitable for providing waterproofing to an exposed floor such as a building roof, a balcony, a veranda or an open corridor. That is, it is preferable that the foundation is a rooftop of a building, a balcony, a veranda, or an open corridor.

[0031]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples (Examples 1 and 2) and Comparative Examples (Examples 3 and 4), but the present invention is not limited thereto.

Example 1 A urethane two-component adhesive was applied to a 10 mm thick slate plate at 0.35 kg / m ² . Weight of 40g on the top of 0.5mm thick EPDM sheet
/ M ² , a three-layer rubber sheet in which a nonwoven fabric (made of polyester continuous fiber) with a basis weight of 200 g / m ² was laminated on the lower surface, was adhered thereon. Next, the same sheet as the sheet was stuck side by side so that the ends of the sheet were attached to each other.

A blended mesh formed by reinforcing a vinylon non-woven fabric with glass fiber yarns, having a width of 100 mm and a thickness of 0.1
A sheet having a thickness of 8 mm and a basis weight of 45 g / m ² was laid so as to cover the joint between the ends of the sheet. Next, a thixotropic urethane coating waterproofing material was applied thereon at 0.9 kg / m ² , and after being thoroughly wrung with a spatula, it was cured. Using a part of the obtained sample, evaluation of “waterproof property of a joint portion between end portions of the sheet” was performed.

Using the rest of the sample, a urethane-based two-liquid waterproof material (corresponding to urethane rubber-based class 1 in JIS-A6021) was applied to 3.0 kg / m ² (thickness of about 2.4 mm) thereon. A waterproof coating layer was formed. Finally, an acrylic urethane-based two-liquid top coat was applied at 0.2 kg / m ² to obtain a urethane coating waterproof layer. This sample was evaluated for a “swelling test”.

Example 2 The same urethane two-part adhesive as in Example 1 was applied to a 100 mm thick slate plate at 0.35 kg / m ^2.
Was applied. Thickness 1. 50 g / m ² on the upper surface of the vulcanized butyl rubber sheet 5 mm, of 250 g / m ² on the lower surface, a rubber sheet having a three-layer structure formed by laminating the nonwoven fabric (polyester filament) was affixed thereon. Next, the same sheet as the sheet was stuck side by side so that the ends of the sheet were attached to each other.

The same reinforcing cloth as in Example 1 was laid so as to cover the joint between the ends of the sheet. Then, on top of that,
The same thixotropic urethane coating waterproofing material as in Example 1 was added at 1.0 kg /
It was applied to m ^2, after well squeezed with a spatula and allowed to cure. Using a part of the obtained sample, evaluation of “waterproof property of a joint portion between end portions of the sheet” was performed.

Using the remainder of the sample, a urethane-based two-liquid waterproof material similar to that of Example 1 was applied thereon at 2.5 kg / m ² (about 2 m
m) to form a coating waterproof layer. Finally, apply an acrylic urethane two-liquid top coat of 0.2 kg / m ²
To obtain a urethane coating waterproof layer. This sample was evaluated for a “swelling test”.

Example 3 Instead of treating with a reinforcing cloth and a thixotropic urethane coating waterproofing material, an adhesive tape of 50 mm width consisting of a polyester nonwoven fabric having a basis weight of 50 g / m ² , a polyethylene film of 30 μm, and an acrylic adhesive. Was carried out in exactly the same manner as in Example 1 except that the sheet was attached to the center of the joint between the ends of the sheet.

"Example 4" In Example 3, exactly the same as Example 3 except that the urethane-based two-part adhesive 0.15 kg / m ^{2 was} applied only to the sheet surface before the pressure-sensitive adhesive tape was stuck, and then cured and dried. went.

[Evaluation] "Waterproofness of Joints between Ends of Sheet" As shown in FIG. 2, a hydraulic tube having a diameter of 200 mm was installed at the center of the joints of the samples, and 0.1 kg / cm ² and 0.5 kg were used. / Cm ² , 1.
When a water pressure of 0 kg / cm ² was applied for 5 minutes, the presence or absence of water leakage to the substrate (slate side) was observed.

"Swelling test" A 10 mmφ through hole was opened in the center of the slate plate of the sample, and 0.1 kg / cm ² , 0.3
kg / cm ² , 0.7 kg / cm ² , 1.0 kg / cm
^When the air pressure of No. ² was applied for 5 minutes each, it was observed whether or not the tape at the joining portion was lifted or blistered.

[0042]

[Table 1]

[0043]

According to the waterproofing method of the present invention, it is possible to improve the waterproofness of the joint portion which is considered to be weak, and to provide an excellent waterproof structure which does not swell due to evaporation of moisture from the base. In addition, the construction is simple, the specified film thickness can be secured uniformly, and there is no unevenness, and more reliable waterproofing with respect to durability and waterproofness can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a waterproof structure according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a method for testing waterproofness of a joint between end portions of a sheet in an embodiment of the present invention.

Claims (7)

[Claims] 1. A waterproofing method in which a plurality of synthetic polymer sheets are arranged side by side and adhered to a substrate, and a waterproofing method of applying a urethane coating waterproofing material (A) thereon is used to cover a joint between end portions of the sheets with a reinforcing cloth. A waterproofing method, further comprising applying and impregnating a waterproof coating material (B) on the reinforcing cloth, and then applying a urethane waterproof coating material (A) on the entire synthetic polymer sheet. 2. The waterproofing method according to claim 1, wherein, when a plurality of synthetic polymer sheets are arranged and attached to a substrate, the ends of the sheets are attached to each other. 3. The waterproofing method according to claim 1, wherein the waterproof coating material (B) is a waterproof coating material having thixotropic properties. 4. The waterproofing method according to claim 1, wherein an adhesive is used when attaching the synthetic polymer sheet to the base. 5. The building according to claim 1, 2, 3 or 4, wherein the foundation is a building roof, a balcony, a veranda or an open corridor.
Waterproofing method described in. 6. A synthetic polymer sheet layer comprising a base and a plurality of synthetic polymer sheets arranged side by side, and a urethane coating waterproof layer (a) covering the surface of the synthetic polymer sheet layer. In the provided waterproof structure, the waterproof structure covers the joint between the ends of the synthetic polymer sheet and is provided under the urethane coated waterproof layer (a). A waterproof structure comprising a reinforcing cloth layer impregnated and cured with a waterproof material (b). 7. The waterproof structure according to claim 6, further comprising an adhesive layer between the base and the synthetic polymer sheet layer.