JPH11245323A - Waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a waterproof sheet without troubles of bond strength between a sheet body and a signal layer, troubles of adhesion to other waterproof sheets, or the like. SOLUTION: A waterproof sheet 1 is formed by laminating a signal layer 3, which is composed of a same material with a sheet body 2 and has different color, on the sheet body 2 composed of a sheet nonpermeable to water. The waterproof sheet enables easy and secure laminating of the signal layer for visually judging scratches or the like likely to harm functions of the waterproof sheet. And damaged parts of the sheet is easily discovered visually, and at the time of applying of the sheet, mutual bonding characteristics between waterproof sheets is good. Repairing work of the damaged parts is also easy, and waterproof application of a tunnel can be carried out securely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground or a primary lining concrete and a secondary lining concrete, in which spring water from the primary lining concrete side leaks to the secondary lining concrete side. More particularly, the present invention relates to a waterproof sheet that can be easily visually checked whether or not a sheet surface is damaged.

[0002]

2. Description of the Related Art
A waterproof sheet is interposed between the ground of the tunnel or the primary lining concrete and the secondary lining concrete, and spring water from underground leaks into the secondary lining concrete from the primary lining concrete side in the tunnel. In the case of such a waterproof sheet, if the surface of the waterproof sheet is damaged due to stretching work, ground pile, unevenness of the primary lining concrete, etc., the scratch is found visually. In order to make it possible, a waterproof sheet is used in which a polyethylene (PE) film of a different color such as milky white is laminated as a signal layer on the surface of a black sheet body made of ethylene copolymer bitumen (ECB).

However, in the case of the ECB sheet, the color is limited to black due to the blending of bitumen. Therefore, in order to laminate signal layers of different colors, the materials of the sheet body and the signal layer must be different. Therefore, there are problems with the adhesive strength of the waterproof sheet, the adhesiveness with other waterproof sheets, the repairability, and the like.

The present invention has been made in view of the above circumstances, and has as its object to provide a waterproof sheet having no problems such as adhesion strength between a sheet body and a signal layer and adhesion to other waterproof sheets. It is.

[0005]

In order to achieve the above object, the present invention is characterized in that signal layers of different colors made of the same material as the sheet body are laminated on a sheet body made of an impermeable sheet. To provide a waterproof sheet.

That is, the waterproof sheet of the present invention is used for waterproofing construction of a tunnel, etc. For example, a fixing spatula such as a vertical spatula or a horizontal spatula is appropriately attached to a surface of the sheet body side, and Alternatively, it is disposed so that the surface of the sheet body side faces the primary lining concrete, and the fixing wrench is stretched by appropriate means such as hitting the ground or the primary lining concrete with a fixing member such as a concrete nail. ,
If the waterproofing sheet surface is damaged due to such stretching work, or a hole that reaches the surface of the waterproofing sheet after stretching due to unevenness of the ground, primary lining concrete, etc. Since the signal layer is broken, the scratched portion can be easily found visually. Here, in the case of the waterproof sheet of the present invention, since the sheet body and the signal layer of different colors are made of the same material, there is a wide choice of resin and lamination method when manufacturing the waterproof sheet, and the sheet body and the signal layer Not only is the adhesive strength excellent, but when a flaw is found, it can be easily repaired. Furthermore, even if it is necessary to adjust the thickness of the waterproof sheet to the standard, since the thickness ratio between the sheet body and the signal layer can be freely selected within the defined sheet thickness range,
There is more room for selection of the thickness of the signal layer, and the signal layer can be set to a thickness that allows easy determination of a flaw. Then, in order to connect the waterproof sheets at the time of waterproofing construction, the side ends of both waterproof sheets are put together or overlapped with each other, and the two waterproof sheets are connected by thermally bonding this portion. Since the sheet body and the signal layer are made of the same material, the heat-sealed layers are made of the same material even when the side ends of both waterproof sheets are put together, and they are easily and firmly adhered even when they are overlapped. be able to.

Therefore, the waterproof sheet of the present invention can easily find and repair a damaged portion of the waterproof sheet when performing waterproofing of the tunnel, and also has an easy manufacturing method and excellent durability.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view illustrating one configuration example of the waterproof sheet of the present invention. The waterproof sheet 1 has a structure in which signal layers 3 of different colors made of the same material as the sheet body 2 are laminated on one surface of a sheet body 2 made of an impermeable sheet. Here, the seat body 2
Although the material is not particularly limited, in the case of the present invention, ethylene-vinyl acetate copolymer (EVA), Almost colorless and transparent synthetic resins such as polyvinyl chloride and polyethylene are preferred. In addition, the thickness of the sheet body 2 is not particularly limited, but is 0.4 to 3 in consideration of the strength and handleability as a waterproof sheet.
mm, especially 0.8 to 2 mm is preferred. The color of the sheet body 2 is not particularly limited, but may be a dark color (dark sunk color) in consideration of a color difference from the signal layer 3 which is desirably a bright color as described later. desirable.

The water-impermeable film forming the signal layer 3 is made of the same material as that of the sheet body 2, and the color is not particularly limited as long as the color is different from that of the sheet body 2. Considering the easiness of the certification, it is preferable that the brightness, saturation, and hue are greatly different from each other so that they can be distinguished from the color of the sheet body 2 at a glance. If so, a combination of pale tone or vivid tone for dark tones and dull tones is preferable, and a combination of chromatic colors for achromatic colors is particularly preferable. In the case of such a combination, it is desirable that the signal layer 3 be a bright color (bright color) in consideration of workability in a dark tunnel. As a specific color combination, for example, a combination of black and yellow, gray and yellow-green, blue and white, and the like are preferable. Among these combinations, particularly, the sheet body 2 is black, the signal layer 3 is yellow, and the sheet is A combination in which the main body 2 is gray, the signal layer 3 is yellow-green, the sheet main body 2 is blue, and the signal layer 3 is white is more preferable.

Since the thickness of the signal layer 3 is made of the same material as the sheet body 2, it can be appropriately selected in consideration of manufacturability, handleability, strength and the like of the waterproof sheet. 0.5 to 0.5 mm, especially 0.1 to
It is suitable to be 0.2 mm. If the signal layer 3 is too thin, not only does the workability in manufacturing the waterproof sheet deteriorate, but also a small scratch that does not affect the function of the waterproof sheet is found because the signal layer 3 is easily broken by a small impact. As a result, the efficiency of finding a flaw that adversely affects the function of the waterproof sheet may be reduced. On the other hand, if the signal layer 3 is too thick, the flaw may be difficult to distinguish.
For the same reason, the sheet body 2 and the signal layer 3
The ratio of the thickness of the sheet body 2 to the thickness of the signal layer 3 is 2
It is desirably 10 to 10 times, especially 4 to 6 times. Also,
The total thickness of the sheet body 2 and the signal layer 3 is 0.45 to
3.5 mm, especially 0.9 to 2.2 mm, is suitable.

In the method for producing the waterproof sheet of the present invention, a known laminating method can be used. For example, the laminate may be laminated via an adhesive by a dry laminating method or the like. Lamination may be performed by heat welding using a coextrusion method, an extrusion lamination method, a thermocompression lamination method, or the like. However, in consideration of production efficiency, the waterproof sheet 1 is manufactured by lamination using a coextrusion method without using an adhesive. Then
More preferred.

The waterproof sheet 1 can be used as it is. For example, a vertical or horizontal spatula (not shown) can be placed at an appropriate position on the other surface of the sheet body 2 (the surface on which the signal layer 3 is not laminated). Can be attached appropriately, or a water-permeable sheet (not shown) made of nonwoven fabric or the like can be attached to the other surface of the sheet body 2 before the sheet is spread.

The waterproof sheet 1 can be used in the same manner as a conventional waterproof sheet. For example, in the case of a separate tensioning method, the ground or primary lining concrete of a tunnel previously provided with a water-permeable sheet such as a nonwoven fabric. (Not shown) seat body 2
Are stretched so as to face each other, and are stretched and fixed by an appropriate means such as using the above-mentioned fixing screw. Also, if you have previously installed a water-permeable sheet as described above,
The permeable sheet is stretched so as to face the ground or the primary lining concrete, and the permeable sheet is fixed to the ground or the primary lining concrete by a fixing member such as a concrete nail. Then, to connect the waterproof sheets adjacent to each other, the side ends of the two waterproof sheets are overlapped or overlapped with each other, and the sheet body of one of the waterproof sheets and the sheet body of the other waterproof sheet, or one of the waterproof sheets, of this portion. By thermally bonding the sheet body and the other signal layer, both waterproof sheets can be easily and firmly joined. When the water permeable sheet is attached in advance, the side ends of the water permeable sheets adjacent to each other are overlapped with each other, and a fixing member is driven into this portion to be fixed to the ground or the like.

If the waterproof sheet 1 is stretched on ground or primary lining concrete in this way, the signal layer 3 side of the waterproof sheet 1 becomes the surface side. If there is a scratch on the side, the single layer 3 is broken and the sheet body 2 of a different color is exposed,
The damaged portion can be easily found visually, and if a hole reaching the surface is opened, the single layer 3 is also broken, so that the hole can be easily found visually. And if you find any scratches or holes,
Before placing the secondary lining concrete, a repair sheet made of the same material as the sheet body 2 of the waterproof sheet 1 is placed just above the holes, and the outer peripheral portion of the repair sheet and the signal layer 3 of the waterproof sheet 1 are heated with hot air. The waterproof sheet 1 can be easily repaired by appropriate means such as fusion bonding.

Therefore, according to such a waterproof sheet 1, even if a scratch or a hole that might adversely affect the waterproof function is generated in the waterproof sheet by the sheet stretching operation, the damaged portion is visually inspected. Since it can be easily found and the repair work on the location is easy, the waterproof construction of the tunnel can be surely performed.

The waterproof sheet of the present invention is not limited to the above-described structure, and may be variously modified without departing from the gist of the present invention.

[0017]

According to the waterproof sheet of the present invention, a signal layer for visually judging a scratch or the like which may impair the function of the waterproof sheet can be easily and surely laminated, and a damaged portion of the sheet can be provided. Not only can be easily found visually, but also the waterproofing sheet has good jointability when the sheet is stretched, and it is also easy to repair damaged parts. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a waterproof sheet for explaining a configuration example of a waterproof sheet of the present invention.

[Explanation of symbols]

 1 Waterproof sheet 2 Sheet body 3 Signal layer

Claims (1)

[Claims] 1. A sheet body comprising a water-impermeable sheet,
A waterproof sheet, wherein signal layers of different colors made of the same material as the sheet body are laminated.