JPH07293196A - Joining method for impermeable sheet - Google Patents

Abstract

PURPOSE:To provide self-repair if leakage of water occurs at a joining part by forbidding inferior adhesion causing leakage of water at the joining part of two water impermeable sheets consisting of a polymer material such as a thermoplastic synthetic resin and rubber. CONSTITUTION:Three or more first protruding strips consisting of an adhesive are formed in parallel along an edge part one of the two water impermeable sheets to be joined to each other. A second protruding strip consisting of a water-swelling composition obtained by adding a water-absorbing polymer to an adhesive is formed between the first protruding strips and in parallel along the edge part. The edge parts of the two water impermeable sheets are superimposed. A roller is pressed against the water impermeable sheet on the upper side and is rolled along the edge parts.

Description

Detailed Description of the Invention

[0001]

This invention relates to a waste treatment plant, an artificial reservoir, a river embankment, a roof of a reinforced concrete building,
The present invention relates to a method for joining a water-impermeable sheet for civil engineering construction, which is laid to prevent water leakage in subway station buildings and underground buried objects.

[0002]

2. Description of the Related Art As a water-blocking sheet for civil engineering construction laid on the roof of a waste treatment plant or a reinforced concrete building to prevent water leakage, vinyl chloride type, polyethylene type,
Sheets made of synthetic polymer materials such as synthetic rubber are often used. These waterproof sheets have a thickness of 1 to 4 mm,
It is formed into a width of 1 to 8 m and a length of 1 to 20 m, and multiple sheets are stacked at the side edges and bonded by adhesion to form a rectangular sheet, which is wound into a roll and transported to the construction site, and further vertically and horizontally. They were joined to form the required area.

As the above-mentioned joining method, a bonding method of adhering with an adhesive such as a solvent type or a natural vulcanizing type, an adhesive pre-applied to the edge of the water-blocking sheet, and a water-blocking sheet are used. In the case of a thermoplastic synthetic resin, a hot air fusion method in which the edge portion of the sheet is melted by hot air and pressure-bonded is known, and EPDM, a mixture of EPDM and IIR, C
Adhesive method and hot air fusion method are used for synthetic rubber water impervious sheets such as R, CSM and CPE, and hot air fusion is applied to thermoplastic synthetic resin sheets such as PVC, olefin resin (eg PE) and EVA. The construction method was used.

[0004]

However, in the conventional bonding method, the adhesive is evenly applied with a brush over the entire bonding surface having a width of several tens of millimeters, and the adhesive tape is sandwiched between the bonding surfaces, and then the roller is used. Since the pressure is applied by means such as the above, a bonding portion is formed before the air is completely discharged from the joint surface to form an air pocket, and therefore water may leak from this portion. Further, also in the hot-air fusion bonding method, since the entire overlapping portions of the side edges of the two sheets are adhered to each other, an air pocket may occur and water may leak as in the above case. In addition, the unevenness of the thickness of the water-impermeable sheet body and the unevenness of the thickness of the applied adhesive layer may promote the generation of the air pool.

A first object of the present invention is to prevent a bonding failure which causes water leakage from occurring at a joint portion between two water shield sheets made of a polymeric material such as a thermoplastic synthetic resin and rubber. Is. The second problem is to self-repair the water-swellable composition provided in the joint in the event that water leaks in part of the joint.

[0006]

A first structure for solving the above-mentioned first problem is to overlap the end portions or side edges of two water-impervious sheets made of a polymeric material such as thermoplastic synthetic resin and rubber. In the method of joining water-impervious sheets to be adhered together, a plurality of ridges made of an adhesive are formed in parallel along one edge of one of the two water-impervious sheets to be joined, After the edges of the water-impermeable sheets are overlapped, a roller is pressed onto the upper water-impermeable sheet and rolled along the edges.

The above-mentioned thermoplastic synthetic resin is an ordinary thermoplastic synthetic resin generally used as a water-blocking sheet,
Polyvinyl chloride, high density polyethylene, low density polyethylene, cross-linked polyethylene, chlorinated polyethylene, EVA
Other olefin resins are exemplified. Further, the rubber is a normal rubber which is also commonly used as a waterproof sheet, and examples thereof include EPDM and IIR. In addition, the water shield sheet made of these thermoplastic resins or rubber,
It may be a composite sheet obtained by laminating two or more of the above water-impermeable sheets, and a reinforcing layer made of a fiber sheet such as nonwoven fabric, woven fabric or knitted fabric may be provided as an intermediate layer.

As the adhesive, a solvent-based adhesive, a natural vulcanization type adhesive, a hot melt type adhesive or the like is appropriately selected and used according to the type of the water-blocking sheet. These adhesives
One of the edges of the two water-impervious sheets to be joined, that is, a plurality of widths of 30 to 50 mm parallel to the edge of the water-impermeable sheet along the edges of the lengthwise direction or the widthwise direction. It is applied in the form of ridges on a book. However, when the water-impervious sheet is made of a thermoplastic synthetic resin, a plurality of ridges can be provided by molding at the time of molding, and this can be used as a self-bonding ridge.

The width of the ridge made of the above adhesive is 1-2 mm
However, the height is 0.5 to 1.5 mm, and the pitch is 3 to
10 mm is preferable. It is advantageous to apply the adhesive by extruding the adhesive from the nozzles while moving a plurality of nozzles protruding from the tip of the extruder along the upper surface of the joint.

The water-impermeable sheet provided with the ridges made of an adhesive is formed by superposing the edge of the other water-impermeable sheet on one of the joints of the two water-impermeable sheets, and by placing a pressing roller on it. Rolling is performed from one end to the other end in the lengthwise direction of the part, and at that time, the overlapping part of the two water-impervious sheets is adhered by crushing the streaks of the adhesive. However, when a hot-melt adhesive is used as the adhesive, the edge of the other water-blocking sheet is partially overlapped on the application surface of the hot-melt adhesive while the application surface and the other surface of the other immediately before being overlaid. Hot air is applied to the joint surface of the water-impervious sheet to melt the hot-melt adhesive, and the water-impermeable sheet is heated, and then the other water-impermeable sheet is overlaid and pressed with a roller.

A second structure for solving the above-mentioned second problem is to bond the two water-impervious sheets made of a polymeric material such as thermoplastic synthetic resin and rubber by overlapping the end portions or side edges thereof. In the method of joining water-impervious sheets, the above-mentioned two water-impervious sheets to be joined are formed of an adhesive on one edge portion of the water-impermeable sheet 3.
1 or more than the above-mentioned first ridge, which is composed of the above-mentioned first ridge and a water-swellable composition obtained by adding a water-absorbing polymer to the adhesive.
A small number of second ridges are formed in parallel along the edge so that the second ridge is located between the first ridges, and the edges of the two water-impervious sheets are overlapped. After that, the roller is brought into pressure contact with the upper water-impervious sheet and rolled along the edge.

In this second structure, the thermoplastic synthetic resin and rubber constituting the water-blocking sheet are the same as those used in the first structure. The adhesive forming the first ridge is the same as that used for the first structure.
On the other hand, the water-swellable composition of the second ridge is a water-swellable natural vulcanization (curing) type rubber composition, a water-swellable sealing agent, a water-swellable caulking agent, etc. Although obtained by addition, this adhesive does not necessarily have to be of the same type as the adhesive of the first ridge. For example, when a solvent-based adhesive is used for the first ridge, a water-swellable unvulcanized rubber composition composed of rubber and a water-absorbing polymer is used for the second ridge, and a natural vulcanization type is used for the first ridge. When an adhesive is used, a mixture of a natural vulcanizing type adhesive and a water-absorbing polymer is used for the second ridge, and when a hot melt type adhesive is used for the first ridge, the second ridge is a hot melt type. Any combination can be selected, such as using a mixture of an adhesive and a water-absorbing polymer, respectively.

However, when the waterproof sheet is made of a thermoplastic synthetic resin, at the same time as the molding, three or more odd first ridges are molded at a pitch twice the predetermined pitch, and after this molding is completed. Applying the above-mentioned water-swellable composition, preferably a water-swellable composition comprising a hot-melt adhesive and a water-absorbent polymer, between the two adjacent first ridges to form the second ridges. You can

Examples of the water-absorbing polymer include polyacrylic acid salt type, starch / acrylic acid, vinyl acetate / acrylic acid copolymer, polyethylene oxide type, isobutylene /
Maleic anhydride copolymer, PVA / maleic anhydride copolymer, acrylate / acrylamide copolymer and C
A super absorbent polymer such as MC type can be used. Any one of these water-absorbing polymers may be used alone or 2
More than one species are used together. The amount of addition to the adhesive is preferably 50 to 100 parts by weight with respect to 100 parts by weight of the adhesive.

[0015]

In the first structure, the edges of the two water-impervious sheets are overlapped with each other, and the overlapping portion is pressed by the rollers and rolled in the direction of the edges, so that the adhesive forms a plurality of ridges. Since it is provided in a shape, the air existing between the ridges is discharged from the ends of the ridges as the rollers roll, and the ridges of the adhesive are easily crushed by the pressure of the rollers. It flows and absorbs the level difference between the impermeable sheets to completely fill the recesses. Therefore,
The top or bottom of the ridge is not interrupted to form a pin pole across the ridge, and water leakage due to poor adhesion does not occur.

In the second structure, the first and second ridges are provided in parallel, and the first ridge has the same structure as the ridge of the first structure. As in the case of (1), water leakage due to poor adhesion does not occur. Since the second ridge made of the water-swellable composition is provided between the first ridges, if water should leak due to poor adhesion, the water should contact the second ridge. As a result, the second ridge swells to close the water leak location and self-repair the water leak location.

[0017]

【Example】

Example 1 Ethylene propylene rubber (EPDM) and butyl rubber (I
(IR) blended rubber with a thickness of 1.5 mm, width of 1 m,
A water-blocking sheet with a length of 8 m was molded, and a solvent-based adhesive (Nogawa Chemical Co., Ltd., trade name "Diabond No.808") was applied to the edge on one side, and seven ridges (width 2 mm) were applied. ,
The height was 1.5 mm) and the pitch was 5 mm. Then, overlay the edge of another water-blocking sheet on this adhesive-coated surface,
A pressing roller with a handle (diameter: 150 mm, width: 80 mm) was placed on the overlapping portion and pressed, and the water-impermeable sheet was rolled from one end to the other end to obtain a joint portion having no pinhole.

Example 2 Using high density polyethylene, thickness 1.5 mm, width 1 m,
When forming a water-impervious sheet having a length of 8 m, 15 ridges (width 0.5 mm, height 1 mm) were formed at a pitch of 3 mm along the edge on one side. The obtained two water-impervious sheets are arranged so that the edge of one water-impervious sheet having a ridge is overlapped with the edge of the other water-impervious sheet having no ridge, and the edge of the upper water-impervious sheet is aligned. While inverting and melting the edges of both water-impervious sheets by blowing hot air (at a temperature of 300 ° C.) onto the edges of the lower water-impervious sheet, the edges of the both water-impermeable sheets were overlapped, and Example 1 was applied. In the same manner as in (1), a pressing roller was placed, pressure was applied, and rolling was performed to obtain a joint portion having no pinhole.

Example 3 A blend rubber of EPDM and IIR was used to obtain a thickness of 1.5.
An impermeable sheet having a size of mm, a width of 1 m and a length of 8 m was formed. Next, a hot-melt adhesive Sumitomo Chemical Co., Ltd., trade name "Bond Fast 7B") is applied along the edge on one side to form five first ridges (width 1 mm, height 2 mm, pitch 1).
0 mm), and a polyurethane-based two-component reaction-curable water-swelling sealing agent (trade name “water-expansion-type sealing material UW-” manufactured by Sharp Chemical Industry Co., Ltd.) between the first ridges.
150 ") are arranged to form a total of four second ridges having the same width and height as the first ridges. After that, they were joined by the hot-air fusion bonding method in the same manner as in Example 2 to obtain a joint portion having no pinholes. Then, when a hole was made through the first ridge and the second ridge of the joint portion at a right angle through a thousand holes and brought into contact with high-pressure water with a pressure of 3 kg / cm ² , water leakage initially occurred, but this water leakage It stopped after 60 minutes.

[0020]

According to the invention described in claim 1, a plurality of ridges made of an adhesive are formed parallel to one edge portion of two water-impervious sheets to be joined, along the edge portion. When the edges of the two water-impervious sheets are overlapped with each other, and the overlapping portion is pressed by the roller and rolled in the direction of the edge, the air existing between the ridges is easily discharged and the roller is pressed. Due to the pressure, the ridges of the adhesive are easily crushed and flow, the steps on the surface of the water-blocking sheet are absorbed, and the recesses are completely filled, so that water leakage due to defective adhesion does not occur.

According to the second aspect of the present invention, an adhesive agent is provided on one edge of the two water-impervious sheets to be joined.
Since an odd number of first ridges equal to or more than two and second ridges made of a water-swellable composition are formed between the first ridges, the adhesion failure is the same as the invention described in claim 1. No water leakage will occur. Further, since the second ridge made of the water-swellable composition is provided between the first ridges, if water leakage occurs due to poor adhesion, the second ridge swells due to contact with water. However, the leaked part is self-repaired.

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Claims (2)

[Claims] 1. A method of joining water-impermeable sheets, which comprises adhering end portions or side edges of two water-impermeable sheets made of a polymeric material such as a thermoplastic synthetic resin and rubber so as to overlap each other. A plurality of ridges made of an adhesive are formed parallel to one edge of the water-impermeable sheet of 1. along the edge, and the edges of the two water-impermeable sheets are overlapped, and then the upper water-impermeable sheet. A method of joining water-impervious sheets, comprising pressing a roller onto the top and rolling the roller along the edge. 2. A method of joining water-impervious sheets, which comprises adhering end portions or side edges of two water-impervious sheets, which are made of a polymeric material such as thermoplastic synthetic resin and rubber, in an overlapping manner. The water-swellable composition obtained by adding a water-absorbing polymer to three or more first ridges formed of an adhesive on one edge of the water-impermeable sheet of One less number of second ridges are formed in parallel along the edge so that the second ridge is located between the first ridges, and the edges of the two water-impervious sheets are After stacking, the roller is pressed onto the upper waterproof sheet, and is rolled along the above-mentioned edge portion.