JPH0483097A - Waterproof sheet - Google Patents

Abstract

PURPOSE:To eliminate a gap in a connection and block the leakage of water by extending and overlapping adhesive layers provided on one side of each waterproof layer made of high polymer material, and providing an extension layer on the end side of the structure side waterproof layer in the connection to constitute a waterproof sheet. CONSTITUTION:A waterproof sheet 10 is formed of a waterproof layer 11 and adhesive layer 12, and an extension layer 14 extending from the adhesive layer 12 is provided on the end side of the waterproof layer 11. The waterproof sheet 10 is applied through the adhesive layer 12 to a concrete body 20 and both ends of both sheets 10, 10' are laid overlapping each other. Since the extension layer 14 of the adhesive layer 12 is formed on the end side 13 of the waterproof sheet 10 side waterproof layer 11, the extension layer 14 will always contact the waterproof sheet 10' side adhesive layer 12' when overlaid by the adhesive layer 12' so that both are immediately united. Thus, a gap in the overlapping connection is eliminated so that the intrusion of subterranean water or the like can be completely blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a waterproof sheet used mainly to cover the surface of structures such as subways, public ditches, and underground parking lots to prevent underground water from entering. It is something.

(Prior Art) In recent years, for example, in the construction of subways, a construction method has been used in which huge concrete boxes are buried underground and these boxes are sequentially connected to form tracks.

However, if a concrete box is buried underground as it is, there is a drawback that water will accumulate inside the concrete due to water entering the ground, so generally the entire box is covered with a waterproof sheet made of polymeric material. It is covered watertight to prevent groundwater from entering.

In this waterproof sheet, a waterproof layer made of a polymeric material is previously provided with an adhesive layer on one side, and this adhesive layer is used to adhere the waterproof sheet to the surface of a concrete structure.

(Problem to be Solved) In order to continuously attach the waterproof sheets, the sheets must be overlapped and joined at the ends of the sheets.

FIG. 3 shows a cross section of the overlapping joint portion of the conventional waterproof sheets.

In the figure, reference numeral 1 indicates a concrete frame, and a waterproof sheet 2 is attached to the surface of the concrete frame. This waterproof sheet 2 is provided with a waterproof layer 3 made of a polymeric material and an adhesive layer 4 thereon in advance.
The adhesive layer 4 is attached to the surface of the concrete 1 by its adhesive action, thereby imparting a waterproof function.

However, the ends of this waterproof sheet are generally cut at right angles to the length direction, and therefore it is difficult to overlap the joined parts faithfully along the cross section, and it is inevitable that the gap A will be formed.

Therefore, if the watertightness of the waterproof sheet is impaired at any one location, the invading water will sequentially infiltrate the surface of the frame 1 using this gap A as an ingress path.

As a result, water leaks into the concrete from cracks and defective joints in the concrete body.

(Objective) In view of the above, an object of the present invention is to provide a waterproof sheet for eliminating gaps in the overlapping joints.

(Solution Means) The present invention has been made to achieve the above object, and the gist thereof is to provide a waterproof layer made of a polymeric material, an adhesive layer on one side thereof, and at least one end side surface of the waterproof layer. A waterproof sheet is characterized in that an extension layer is formed extending from the adhesive layer, and when viewed from the construction side, the laminated waterproof sheet is made of a waterproof layer made of a polymeric material and an adhesive layer, and the overlapping joint part It can be said that the waterproof sheet is characterized in that an extension layer extending from the adhesive layer is formed on the end side surface of the waterproof layer of the waterproof sheet located on the structure side.

The waterproof layer forming such a waterproof sheet includes synthetic rubber-based butyl rubber, ethylene propylene terpolymer rubber,
Polymethyl methacrylate, rubber asphalt, etc., and synthetic resins include polyvinyl chloride, polyethylene, ethylene vinyl acetate, etc., and these are used in a single layer or in a laminated form.

All of these membranes have excellent weather resistance and water resistance, and are flexible enough to be used as a waterproof layer.

Also, one adhesive layer forming the waterproof sheet is NR3BR,
Rubber adhesives such as SIS, SBS, 5EBS, butyl rubber, recycled rubber, synthetic resin adhesives such as acrylic, vinyl acetate, EVA, urethane, etc. can be listed, as well as so-called adhesives. Included in the adhesive here.

(Function) In the present invention, since the extension layer of the adhesive layer is formed on the end side surface of the waterproof layer, the adhesive layers of both layers easily come into contact and become integrated when the waterproof sheets are overlapped and bonded. Because of the parentheses, the adhesive layer fills the gap without forming any gaps.

In the present invention, generally the waterproof layer of the waterproof sheet is 0.7~
The thickness is about 1.5 mm, and the adhesive layer is 0.5 to 1 mm.
However, the extension layer of the adhesive layer formed on the end side of the waterproof layer should have a thickness (width) of about 0.5 to 3 mm (if it is less than 0.5 mm, the gap will not be sufficiently closed). It may be difficult to fill it in, and if it is thicker than 3mm,
This amount is unnecessary in terms of volume.

(Specific Example) FIG. 1 shows an example of the waterproof sheet of the present invention being spread out. The waterproof sheet 10 is made up of a waterproof layer 11 and an adhesive layer 12. A extending layer 14 is formed.

In this example, no extension layer is formed on the other end side surface 15 of the waterproof layer 11, but it goes without saying that the above-mentioned extension layer 16 (not shown) of the adhesive layer may be formed there as well. be.

FIG. 2 is a sectional view showing an example in which the waterproof sheets 10 of the present invention are overlapped and bonded on the surface of a concrete frame 20.

In this figure, the waterproof sheet 1o is attached to the concrete frame 2.
0 with an adhesive layer 12, and when the two sheets 10 and 10' are joined, both ends thereof are overlapped.

However, since the extension layer 14 of the adhesive layer 12 is formed on the end side surface 13 of the waterproof layer 11 on the waterproof sheet 10 side, the extension layer 14 of the adhesive layer 12 on the waterproof sheet 10' side is always in contact with the adhesive layer 12' on the waterproof sheet 10' side when stacking them. As a result, the two are immediately integrated, and for this reason, there is no gap here.

(Effects) As described above, in the present invention, by forming an extension layer on the end side of the waterproof sheet using the adhesive layer of the waterproof sheet, the overlapping joint of the waterproof sheets is completed, and water leakage caused by this joint is completely eliminated. Its practical value is extremely large.

FIG. 3 is a cross-sectional view showing an example in which the waterproof sheets 1o of the present invention are overlapped and joined together, and FIG. 3 is a cross-sectional view of the overlapped and joined portion of conventional waterproof sheets.

′・・・Waterproof jet Do...Waterproof layer ′・・・Adhesive layer 3...End side of waterproof layer 4...extension layer 6...Extension layer of adhesive layer O... Concrete frame Patent applicant Brideston Co., Ltd.

[Brief explanation of drawings]

Claims (2)

[Claims] (1) A waterproof sheet comprising a waterproof layer made of a polymeric material and an adhesive layer on one side thereof, and an extension layer extending from the adhesive layer formed on at least one end side of the waterproof layer. (2) A laminated waterproof sheet consisting of a waterproof layer made of a polymeric material and an adhesive layer, in which an extension layer extending from the adhesive layer is formed on the end side of the waterproof layer of the waterproof sheet located on the structure side at the overlapping joint. A tarpaulin sheet that is characterized by: