JPH07216850A - Water leak preventive structure for water barrier sheet edge - Google Patents

Abstract

PURPOSE:To fix the edge of a water barrier sheet, made of synthetic resin, firmly to the surface of concrete and prevent water leak positively. CONSTITUTION:A strip body 2 for an anchor is connected to the tip of a water barrier sheet 1 made of synthetic resin. A protrusion 3 continuous in the longitudinal direction is provided on the face side, embedded in the surface layer of concrete 10, of the strip body 2. Water stop packing 4 is provided over the whole length of the protrusion 3, and the single face of the strip body 2 including the protrusion 3 is embedded in the concrete 10. The anchor strip body 2 at the edge of the water barrier sheet 1 is firmly fixed to the concrete 10 by the protrusion 3 biting into the surface layer of the concrete 10, and water leak is positively prevented by the water stop packing 4 provided at the protrusion 3.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an edge of a water-blocking sheet used as a lining material for agricultural water storage, sewage treatment tanks, refuse and industrial waste treatment plants, rivers, dams, riverbeds of ports, levees, etc. Leakage prevention structure.

[0002]

2. Description of the Related Art Various lining materials are used for wall surfaces of concrete water tanks or the like to prevent water leakage. In addition, the lining material is used in various ways depending on the purpose of use of the tank and the environmental conditions, such as the one in which only the side walls are surrounded by concrete in the tank, or the bottom wall is made of concrete.

Conventionally, rubber or soft polyvinyl chloride resin sheet (hereinafter referred to as PVC sheet), polyethylene resin sheet (hereinafter referred to as PE sheet) and the like have been used as this type of lining material. These sheets were long and generally had a thickness of about 1 mm, and the sheets were joined together with an adhesive, or were joined by heat fusion, welding or the like. And the way of fixing the ends of these sheets is to press them with a plate-like object and press them with screws,
A general method is to fix a rubber plate, a PVC plate or the like to the edge of the sheet in advance, bond the plates to each other by welding or an adhesive, and then bond the sheet to the plates.

However, it takes time to weld the plates to each other, and since the work is performed on site, not only is the place where the scaffolding is good, but there is also concern about whether the watertightness is sufficiently secured. Moreover, since the plasticizer may flow out when a PVC sheet is used, a PE sheet has been used more often. Are joined by a garment.

FIG. 4 is a cross-sectional view of a conventional example, showing a state in which a PVC sheet or PE sheet as a lining material is bonded to an anchor plate. In the figure, 100 is a lining material, and 101 is an anchor plate-like body, and these lining material 100 and anchor plate-like body 101 are firmly joined via an adhesive or by heat fusion. 104 and 105 are anchor plate members 101, respectively.
Is a protrusion-shaped anchor that is provided in large numbers on the back surface of the. The lining material 100 is the inclined portion 103 of the side wall of the tank.
And is placed on the concrete bottom wall 102. PV
Since the lining material 100 such as a C sheet or a PE sheet expands and contracts due to a change in temperature, so-called loose lining that does not adhere to the back surface is usually adopted. In the case of this loose lining, the lining material 100 is bonded to the anchor plate-like body 101 whose edges are physically fixed by means such as welding or adhesion, and the lining material 100 is fixed to the anchor plate-like body 1.
The position of 01 prevents the position from being displaced.

[0006]

However, when the liquid in the tank leaks out to the back surface of the lining material 100 in the above, it becomes a serious problem, and particularly when the liquid is a harmful substance or the like, it becomes a serious problem. When the liquid in the tank leaks out, the position of the arrow A at the tip of the anchor plate 101, that is, the anchor plate 101 and the concrete 10
The water leaks through the gap between the lining material 100 and the back surface of the anchor plate-like body 101, and leaks to the back side of the lining material 100. Then, a force for peeling the anchor plate-like body 101 from the concrete surface is exerted for a long time, so that there is a problem that water leakage gradually increases and the lining function is not fulfilled.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a structure capable of securely stopping the edge of the lining material on the wall surface and reliably preventing water leakage.

[0008]

SUMMARY OF THE INVENTION A watertight sheet edge leakage preventing structure according to the present invention is a surface side of a strip of an anchor joined to the tip of a synthetic resin watertight sheet, which is embedded in a concrete surface layer. Is provided with a continuous ridge in the lengthwise direction, a water blocking packing is provided over the entire length of the ridge, and one side of a strip-shaped body including the ridge is embedded in concrete. Further, it is desirable that the synthetic resin water-impervious sheet and the anchor strips are made of polyethylene, and a plurality of ridges are provided on the anchor strips.

[0009]

According to the structure of the present invention, the protrusions continuous in the lengthwise direction are provided on the surface of the anchor strip, which is joined to the tip of the synthetic resin water-impervious sheet, on the surface embedded in the concrete surface layer. Therefore, the anchor strip does not come off or move from the concrete surface, and the waterproof packing is provided over the entire length of the continuous ridges provided on the strip. Since it is buried in the tank, even if the liquid in the tank infiltrates from the boundary between the tip of the strip and the concrete, the liquid is stopped from advancing at the waterproof packing and further leakage is prevented.
Therefore, since the liquid does not spread over the entire back surface side of the anchor strip, the liquid also does not spread around the back surface of the impermeable sheet that is the lining material. Conventionally, water leaks around the back surface of the strip, and the strip tends to gradually come off over a long period of time.However, in the present invention, the waterproof packing is completely attached to the continuous ridges. Therefore, it is possible to almost certainly prevent the liquid from flowing to the back surface side of the belt-shaped body or the lining material.

Further, when the water-blocking sheet and the belt-shaped body are made of polyethylene, since the water-blocking sheet has a large tensile strength which is not provided by rubber or soft polyvinyl chloride resin, even if an unexpected load is applied to the water-blocking sheet, it is made of rubber. It does not easily break like a soft PVC sheet. In addition, there is no concern that the plasticizer will elute.

Further, if a plurality of ridges is provided on the anchor strip, the anchor effect of the strip is greatly increased, and the reliability of the water-impervious sheet for preventing water leakage is also extremely high.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of a water leakage preventing structure for the edges of the water-blocking sheet according to the present invention. In FIG. 1, reference numeral 1 is a waterproof sheet, which is made of a synthetic resin such as polyvinyl chloride resin or polyethylene resin. Usually, its width is 5 to 7 m, length is 50 to 200 m, and thickness is 1
It is about 2 mm.

Reference numeral 2 is a band for anchor, which is a long product obtained by profile extrusion of a thermoplastic resin such as polyvinyl chloride resin or polyethylene resin. Usually, the width is about 15 to 30 cm and the thickness is about 2 to 3 mm, and the length is cut into an appropriate length depending on the situation of the construction site before use.

At least one ridge 3 is provided integrally with the strip-shaped body 2 in the longitudinal direction on one surface of the strip-shaped body 2 for anchoring, that is, on the surface side which is embedded in the concrete surface layer. . A water blocking packing 4 is attached to the tip of the ridge 3, and leakage of water is prevented by the water blocking packing 4. The water blocking packing 4 may be attached to the tip of the ridge 3 with an adhesive or a pressure sensitive adhesive, and the tip of the ridge 3 is thickened to form a groove in the water blocking packing 4, and the ridge 3 is formed in the groove.
You may make it fit the tip of. In any case, it is very important in terms of construction and leakage prevention that the water blocking packing 4 is attached to the ridge 3.

10 is concrete, 11 is usually
It is a basic part consisting of earth and sand. The water-blocking sheet 1 and the anchor strip 2 are completely bonded by means such as an adhesive or heat fusion. Since the anchor strip 2 is made of synthetic resin, it expands and contracts depending on the outside air temperature, so that a small gap is always formed between the concrete 10 surface and the strip 2. When the liquid enters there and the liquid (usually water) advances along the gap as it is, the band-shaped body 2 is peeled off, causing a problem of water leakage. Therefore, if there is a continuous ridge 3 provided with the water blocking packing 4 in the portion where the gap is formed, the progress of the liquid is completely blocked there. In order to completely fill the gap between the concrete and the ridges as the waterproof packing 4 and completely close the gap, a packing made of a water-absorbent resin that absorbs a liquid such as water and expands, or a rubber having a large elasticity, It is possible to use those molded of a material having good water resistance and chemical resistance, such as packing made of elastomer.

2 and 3 are sectional views showing another example of the anchor strip 2 used in the present invention. The strip 2 for anchor shown in FIG. 2 has three protrusions 3 and 1 on the back surface.
3 and 23 are formed, and each ridge has a different direction. The tip of the central ridge 13 is further divided into two directions, and if it is formed in such a shape, the anchor effect becomes larger. Also, the anchor strip 2 of FIG.
The central ridge is omitted, and the ridges 3 and 13 are provided near the both ends in directions away from each other.

In order to make the anchor strip 2 into a long product, it must be a molded article having flexibility itself. However, if the flexibility is too large, the anchor effect will be lost, so that the strip strip will be formed. The body also needs some rigidity.

In the structure for preventing water leakage at the edge of the waterproof sheet of the present invention, when the concrete 10 is poured, the anchor strip 2 having the waterproof packing 4 attached to the projection 3 is simultaneously provided on the surface layer of the concrete 10. It is embedded so that the surface of the strip 2 is flush with the surface of the concrete 10. Then, after the concrete 10 is solidified, the edge portions of the synthetic resin water-impervious sheet 1 are bonded to the surface of the strip 2 by bonding or heat fusion. Since the anchor strip 2 is thus embedded in the concrete surface layer, the strip 2
It is more excellent in terms of anchoring effect that a large number of protruding ridges are provided on the back surface. However, if there are too many ridges, it becomes difficult for the concrete to be sufficiently filled between the ridges on the back surface of the band-shaped body 2 at the time of burying, and a gap is likely to occur, so the number of ridges is 2
It is preferable that the number of ridges is about 5 and preferably about 2 to 3 as in the case of the anchor strip shown in FIGS.

[0020]

EFFECTS OF THE INVENTION The water leakage prevention structure at the edge of the water-blocking sheet according to the present invention is provided with the water blocking packing over the entire length of the continuous ridges provided on the anchor strip, so that concrete and the strip are provided. Even if a liquid such as water invades between the body and the body, it is possible to completely prevent the progress thereof. Further, when the water-blocking sheet and the anchor strips are made of polyethylene, the tensile strength is large, so that the water-proof sheet is less likely to be damaged, and the effect of preventing water leakage becomes more remarkable. When a plurality of continuous ridges are provided on the strip, the anchor effect is large, and there is no concern that the strip may be peeled off from the concrete surface to cause water leakage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a water leakage prevention structure at an edge of a water shield sheet showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of an anchor strip used in the present invention.

FIG. 3 is a cross-sectional view showing another example of the anchor strip used in the present invention.

FIG. 4 is a cross-sectional view of an edge portion of a waterproof sheet showing a conventional example.

[Explanation of symbols]

 1 Synthetic resin waterproof sheet 2 Anchor strip 3 Projection 4 Water stop packing 10 Concrete

Claims (3)

[Claims] 1. A ridge that is continuous in the lengthwise direction is provided on the surface side of an anchor strip that is joined to the tip of a synthetic resin water-impervious sheet and is embedded in the concrete surface layer, and the ridge extends over the entire length of the ridge. A waterproofing structure for preventing water leakage at the edge of the water-blocking sheet, in which one side of the strip-shaped body including the protrusions is embedded in the concrete. 2. The water leakage prevention structure for an edge of a water impervious sheet according to claim 1, wherein the synthetic resin impermeable sheet and the anchor strip are made of polyethylene. 3. The leakage prevention of the edge of the water-blocking sheet according to claim 1, wherein a plurality of projections continuous in the length direction are provided on the surface side of the anchor strip that is embedded in the concrete surface layer. Construction.