JP2002322769A - Waterproofing method for flat roof or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing method for a flat roof or the like of which the work is simple, execution dispersion caused by generation of wrinkles or the like is less and durability in the long term is excellent. SOLUTION: A waterproofing sheet 3 comprising a film soluble in an organic solvent (preferably an acrylic resin film) or an article in which the films soluble in an organic solvent are laminated on both sides of a core material is provided in the outside of a flat roof 1 or the like, a joint part 6 is sealed up on the film soluble in an organic solvent or the base material in which the films soluble in an organic solvent are laminated on both sides of a core material by a water proofing tape 4 which is formed by laminating an adhesive in a width narrower than a width of the base material, and both end parts of the waterproofing tape in which the base material is exposed is welded to the water proofing sheet 3 with an organic solvent.

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 a flat roof or the like, and more particularly to a waterproofing method for a flat roof or the like using a waterproof sheet and a waterproof tape.

[0002]

2. Description of the Related Art Conventionally, as a waterproofing method using a waterproof sheet on a flat roof or a balcony, a synthetic rubber sheet or a vinyl chloride resin sheet is laid on the outside of a body, and a sheet is formed. A method in which the joints are overlapped (overlapping) and heat-sealed or a method in which the joints are welded with a solvent has been used.
For example, as described in Japanese Patent Publication No. 2-36736, a laminated laminate of a vinyl chloride resin and a steel sheet is used.
A method has been used in which a vinyl chloride resin is laid as a surface layer and the joints are welded with a solvent such as tetrahydrofuran using the same vinyl chloride resin sheet. Also,
As described in Japanese Utility Model Laid-Open Publication No. 3-35124, a method of stopping the overwrap portion of the waterproof sheet with a waterproof adhesive tape may be used.

[0003]

However, according to the study of the present inventors, in the above-mentioned method using heat fusion, the fusion temperature usually needs to be 80 ° C. or more, which requires a long working time and is long. Fusion of the distance has a problem that a burden is imposed on the posture of the worker. In addition, Japanese Patent Publication No. 2-3673
As described in JP-A No. 6 (1994), when a base tape is pasted and a vinyl chloride sheet is stuck thereon, the base tape and the vinyl chloride sheet do not usually adhere to each other. (Wrinkles) are likely to occur, and the operation is complicated and time-consuming. Further, the vinyl chloride sheet is not always excellent in weather resistance, and in some cases, a long-term stable waterproof performance cannot be obtained.

The method using a waterproof adhesive tape disclosed in Japanese Utility Model Application Laid-Open No. 3-35124 is an excellent method for waterproofing on a flat surface, but the seam of the waterproof sheet is vertical.
At the overlapped portion of the waterproof tape and the rising portion of the parapet or the like which appeared at the same time, a gap is easily formed between the waterproof sheet and the waterproof tape, which causes a problem of water leakage. In view of the above, an object of the present invention is to provide a long-term durability in which work is simple, there is little variation in construction due to generation of wrinkles, etc., and there is no gap even in a laminated portion or a rising portion of a waterproof tape. It is to provide a waterproofing method for a flat roof or the like which is excellent.

[0005]

According to a first aspect of the present invention, a waterproofing method for a flat roof comprises a film soluble in an organic solvent or a film in which an organic solvent is laminated on both sides of a core material. A waterproof sheet is laid on the outside of the body such as a flat roof, and the joint is applied to a base material consisting of a film soluble in an organic solvent or a film in which an organic solvent-soluble film is laminated on both sides of a core material. It is characterized by using a waterproof tape formed by laminating an adhesive with a width smaller than the material width, and welding both ends of the waterproof tape with the base material exposed to the waterproof sheet with an organic solvent. The waterproofing method for a flat roof or the like according to claim 2 is the waterproofing method for a flat roof or the like according to claim 1, wherein the film soluble in an organic solvent is an acrylic resin-based film.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing an example of a waterproofing method for a flat roof or the like of the present invention. FIG. 2 is a schematic view showing an example of a cross section of the joint part in the present invention. FIG. 3 is a schematic sectional view showing an example of the waterproof sheet according to the present invention. FIG. 4 is a schematic sectional view showing an example of a laminated waterproof sheet according to the present invention. FIG. 5 is a schematic sectional view showing an example of the waterproof tape in the present invention. FIG. 6 is a schematic sectional view showing an example of a laminated waterproof tape according to the present invention.

According to the waterproofing method for a flat roof of the present invention, as shown in FIG. 1, a waterproof sheet 3 is laid on a flat roof 1 having a rising portion 2, and a joint 6 is formed using a waterproof tape 4. As shown in FIG. 2, this is a method in which both ends 22 of the waterproof tape 4 where the base material 21 on which the adhesive 23 is laminated are exposed and the waterproof sheet 3 are welded with an organic solvent 24.

The waterproof sheet 3 of the present invention comprises a film 31 soluble in an organic solvent as shown in FIG. 3, or a film 31 soluble in an organic solvent as shown in FIG. 32 are laminated on both sides.

As shown in FIG. 5, the waterproof tape 4 according to the present invention is formed by laminating a pressure-sensitive adhesive 23 on a substrate 21 made of a film 41 soluble in an organic solvent with a width smaller than the width of the substrate 21. Alternatively, as shown in FIG. 6, an adhesive 23 having a width smaller than the width of the base material 21 is laminated on a base material 21 formed by laminating a film 41 soluble in an organic solvent on both sides of a core material 42. It has been done.

The waterproof sheet 3 or the waterproof tape according to the present invention.
Films 31 and 41 soluble in the organic solvent used in step 4
Is not particularly limited as long as it is soluble in an organic solvent and is in the form of a film, but an acrylic resin film is excellent in weather resistance and heat stability, and has resistance to weak acids and weak alkalis. Is more preferable. As the acrylic resin, for example, polymethacrylates such as polymethyl methacrylate and polyethyl methacrylate, and conventionally known polyacrylates and copolymers of polymethacrylates and synthetic rubbers are suitable. .

The films 31, 41 soluble in the above organic solvents
Is not particularly limited, but is preferably 0.1 to 5.0 mm when used alone without being laminated. If the thickness is less than 0.1 mm, the strength of the tensile or tearing will be low and the film will be easily torn. When used as a laminate, the thickness is 0.02
mm to 5.0 mm. 0.0 thickness
If it is less than 2 mm, welding with an organic solvent tends to be insufficient, and if it exceeds 5.0 mm, it becomes difficult to bend at a rising portion such as a parapet.

The waterproof sheet 3 or the waterproof tape according to the present invention.
The core materials 32 and 42 used for the tape 4 are not particularly limited as long as they have waterproofness (impervious to water). For example, polyethylene, polypropylene, polystyrene,
Polyvinyl chloride, polyvinylidene chloride, polycarbonate
Sheets, such as thermoplastic, homo- or copolymer films of thermoplastics such as polyester and polyester, and sheets such as woven and non-woven fabrics made of fibers of these thermoplastic resins;
Examples include films or sheets made of synthetic rubber or natural rubber such as isoprene rubber, isobutylene-isoprene rubber, butadiene rubber, nitro rubber, chloroprene rubber, ethylene propylene rubber, and styrene-butadiene rubber.

The thickness of the core members 32 and 42 is 0.1 to
It is preferably 5.0 mm. When the thickness is less than 0.1 mm, the strength of tensile or tearing is low, and it is easy to be torn.
If it exceeds mm, it will be too hard and difficult to bend, and the workability of the rising part such as a parapet will be poor.

Pressure-sensitive adhesive (pressure-sensitive adhesive) 2 in the present invention
3 may be any conventionally known one. For example, acrylic, rubber, urethane, silicone, and modified silicone adhesives are suitably used, and they may be used alone. They may be used as a copolymer or as a mixture.

The thickness of the pressure-sensitive adhesive 23 is 0.03 to 0.03.
It is preferably 2.0 mm. 0.03mm thickness
If it is less than 1.0 mm, it will not be possible to obtain sufficient adhesion to unevenness or looseness between the waterproof sheets 3.
In some cases, the thickness of the entire step 4 becomes too large and the welding at both ends with the organic solvent becomes insufficient.

The width of the waterproof tape 4 in the present invention is not particularly limited as long as the adhesive 23 is laminated with a width smaller than the width of the substrate 21.
More preferably, 0 mm and the width of the adhesive 23 are 20 to 180 mm. When the width of the base material 21 is less than 50 mm, or when the width of the adhesive 23 is less than 20 mm, the adhesion tends to be insufficient, and when the width of the base material 21 exceeds 200 mm or the width of the adhesive 23 is 180 mm When it exceeds, the sticking work is difficult, and wrinkles (wrinkles) may be formed, resulting in insufficient waterproofness. The width of both end portions where the base material 21 of the waterproof tape 4 on which the adhesive 23 is not laminated is exposed is 5 on each side.
It is preferably about 50 mm. If it is less than 5 mm, the welding tends to be insufficient, and if it exceeds 50 mm, the welding tends to vary.

The organic solvent used in the present invention is not particularly limited as long as it can dissolve both the films 31 and 41 soluble in the organic solvent. Examples thereof include aromatic hydrocarbons such as toluene, xylene, benzene, and naphthalene. And halogenated hydrocarbons such as methylene chloride, carbon tetrachloride, chloroform, dichloroethane, tetrachloroethylene, and trichloroethylene; ketones such as acetone, methyl ethyl ketone and cyclohexane; and acetates such as ethyl acetate and butyl acetate. The organic solvent may be a material in which the same material as the films 31 and 41 soluble in the organic solvent is dissolved in advance.

The waterproof sheet 3 according to the present invention comprises a flat roof 1
It may be laid directly on the outside of the skeleton, or it may be laid on the outside of the skeleton with a heat insulating material. It may be laid from above. The joints of the waterproof sheets 3 may be abutted as shown in FIGS. 2 and 7, or may be overlapped (overlapping) in some cases. In addition, 0 to 20
A gap having a width of mm may be provided. At the joint,
After seaming with the waterproof tape 4, an organic solvent 24 is applied to both ends of the base material 21, and the waterproof tape 4 and the waterproof sheet 3 are welded. In this case, the coating amount of the organic solvent 24 is 10 to 10.
It is preferably 1000 g / m ² . 10 coats
If it is less than g / m ² , the welding tends to be insufficient, and
If it exceeds g / m ² , it takes a long time to evaporate the solvent.

(Operation) In the waterproofing method for a flat roof or the like according to the present invention, since the pressure-sensitive adhesive is laminated with a width smaller than the substrate width of the waterproof tape in which the pressure-sensitive adhesive is laminated on the substrate, The joints are adhered with a pressure-sensitive adhesive, the operation is simple, wrinkles and the like are hardly generated, and there is little variation in construction. In addition, since a waterproof sheet using a film soluble in an organic solvent and a waterproof tape are welded with an organic solvent, it is possible to securely weld the waterproof sheet, and in particular, it is possible to use the waterproof tape in an overlapping manner, or to use a body such as a roof material. Excellent waterproof performance when laying a waterproof sheet on the rising part of the.
When an acrylic resin film having excellent weather resistance is used as the waterproof sheet, excellent long-term durability is exhibited even outdoors.

[0020]

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples. The present invention is not limited only to the following examples. (Example 1) 1. Preparation of waterproof sheet and waterproof tape base material A PE film (made by Sekisui Film Nishinihon Co., 0.5 mm thickness) is used as a core for the waterproof sheet and the waterproof tape base material, and a polymethyl methacrylate film (Mitsubishi Rayon Co., Ltd.) Acrylene (trade name: 0.05 mm in thickness) was laminated on both sides. The size of the waterproof sheet is 1m square, and the base material width of the waterproof tape is 100mm.
And

2. Fabrication of waterproof tape The release tape (W
Solvent-based acrylic adhesive (product name “SK801” manufactured by Soken Chemical Co., Ltd.) on Kite Chemical Industry Co., Ltd. product name “SLK80”
B)) was manufactured so as to have a width of 80 mm and a thickness of 0.1 mm after drying, and laminated such that both end portions of the base material were exposed by 10 mm each to produce a waterproof tape. 3. Preparation of Test Specimen The waterproof sheet 3 obtained as described above is laid on a 3 m square base plywood 71 having a rising portion 2 shown in FIG. 4,
At the same time, the joint portions 6 of the buttings are laid, and the joint portions (not shown) of the waterproof sheet 3 are also laid. Was welded with an organic solvent 24 (toluene) to prepare a test body in the waterproofing method of the present invention.

(Embodiment 2) A waterproof sheet and a waterproof tape
As a base material, a polycarbonate film (trade name “Pinelight”, manufactured by Teijin Chemicals Ltd., thickness: 0.4 mm) is used as a core material, and 70 parts by weight of butyl rubber and 30 parts by weight of polybutene are mixed as a pressure-sensitive adhesive. Specimens were prepared in the same manner as in Example 1, except that a pressure-sensitive adhesive extruded on release paper so as to have a thickness of 1.0 mm was used. (Comparative Example 1) As a waterproof sheet, a synthetic rubber sheet having a thickness of 1.0 mm was used.
Specimens were prepared in the same manner as in the example except that they were overlapped by 0 mm and heat-sealed. (Comparative Example 2) A 1.0 mm thick polyvinyl chloride sheet was used as a waterproof sheet, and the joint was covered with a 100 mm wide waterproof sheet of the same material as the waterproof sheet without using a waterproof tape. A test specimen was prepared in the same manner as in Example 1 except that both were welded with tetrahydrofuran. (Comparative Example 3) A waterproof tape having a base material width of 80 mm, a pressure-sensitive adhesive layered so that both ends thereof were aligned without providing both ends where the base material was exposed, and a waterproof tape was used. Specimens were prepared in the same manner as in Example 1 except that both ends and the waterproof sheet were not welded with an organic solvent.

The following evaluation was performed on the obtained test specimens. 1. Workability The construction time of the joints (four in total) at the time of preparing the test specimen was measured. 2. Leakage condition After leaving the test specimen outdoors for 10 days, water was discharged from the upper part using a hose at a rate of 10 liters / minute for 1 hour, and then the waterproof sheet of the test specimen was peeled off to check the water leakage situation of each part. It was visually confirmed. When the base plywood was wet, it was determined that there was water leakage, and when it was not wet, it was determined that there was no water leakage. The evaluation results were as shown in Table 1.

[0024]

[Table 1] As is clear from Table 1, in the embodiment of the present invention, in addition to having a short construction time and excellent workability,
Even after being left outdoors for a day, it was confirmed that there was no water leakage in any of the flat part, the rising part, and the overlapping part, and that excellent water resistance was exhibited.

[0025]

According to the waterproofing method for flat roofs and the like of the present invention, since a waterproof tape in which an adhesive is laminated on a base material is used, the adhesiveness of the tape makes it easy to bond the joints of the sheet, and the organic solvent can be used. A water-soluble sheet composed of a soluble film or a film soluble in an organic solvent laminated on both sides of a core, and a film soluble in an organic solvent or a film soluble in an organic solvent. Since a waterproof tape is used in which an adhesive is laminated with a width smaller than the width of the base material on a base material laminated on both sides, both ends of the waterproof tape with the base material exposed and the waterproof sheet are formed of an organic solvent. It can be welded securely and exhibits excellent waterproof performance. When the film soluble in the organic solvent is an acrylic resin-based film, the film is more excellent in long-term durability such as weather resistance. In particular, the present invention has good workability and can exhibit excellent waterproofness when a waterproof tape is overlapped and used or a waterproof sheet is laid on a rising portion of a frame such as a roofing material. In this respect, this is a preferred waterproofing method.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a waterproofing method for a flat roof or the like of the present invention.

FIG. 2 is a schematic view showing an example of a cross section of a joint in the present invention.

FIG. 3 is a schematic sectional view showing an example of a waterproof sheet according to the present invention.

FIG. 4 is a schematic sectional view showing an example of a laminated waterproof sheet according to the present invention.

FIG. 5 is a schematic sectional view showing an example of a waterproof tape according to the present invention.

FIG. 6 is a schematic sectional view showing an example of a laminated waterproof tape according to the present invention.

FIG. 7 is a schematic view showing a test piece of a waterproofing method according to an example of the present invention. (A) is a top view. (B) is A-
It is A 'sectional drawing. (C) is a BB 'sectional view.

[Explanation of symbols]

 1. Flat roof 2. Rising part 3. Waterproof sheet 4. Waterproof tape 6. Joint part 21. Substrate 22. Edge 23. Adhesive 24. Organic solvent 31, 41. Film soluble in organic solvent 32, 42. Core material 71. Ground plywood

Claims (2)

[Claims] 1. A water-soluble sheet made of a film soluble in an organic solvent or a film in which an organic solvent-soluble film is laminated on both sides of a core material is laid on the outside of a frame such as a flat roof, and the joint portion is provided. With a waterproof tape formed by laminating an adhesive in a width smaller than the width of the base material, on a base material consisting of a film soluble in an organic solvent or a film soluble in an organic solvent laminated on both sides of the core material. A waterproofing method for a flat roof or the like, characterized in that both ends of the waterproof tape having the base material exposed and the waterproof sheet are welded with an organic solvent. 2. The method according to claim 1, wherein the film soluble in the organic solvent is an acrylic resin film.