JPH04343907A - Impermeable waterproof sheet constructing method - Google Patents

Abstract

PURPOSE:To easily prevent water leakage without so much labor by piling the peripheral section of each sheet and by providing a layer made of water swelling object between the sections at which the peripheral sheets are piled in spreading several impermeable sheets. CONSTITUTION:The soil of the ground scheduled to become an artificial pond, brook or the like is removed, and impermeable waterproof sheets made of rubber or polyvinyl chloride are spread piled to generally about 3 through 20cm, desirably about 1Ocm. In the next step, a formed object comprising grain- like bentonites adhered to both sides of non-woven cloth used as a core material is cut off to proper size. These formed objects are inserted in the joint sections of each sheet so as to hold the joint sections to form a layer made of water swelling object. After forming this layer, the sheets are temporarily fixed by stables and nails, and impermeable structure is constructed by putting soil of about 30 through 50cm in thickness on these sheets.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method of constructing an impervious waterproof sheet to prevent water from seeping into the ground from artificial ponds, streams, etc., and from leaking into basements of building structures, etc. .

0002

[Prior Art] In artificial ponds and streams in parks, gardens, golf courses, etc., the banks and bottoms are often made of concrete to prevent water from penetrating into the ground. The drawback is that it not only destroys the natural landscape and loses its harmony with the surrounding scenery, but also causes cracks. For this reason, it has recently become common to create artificial ponds, streams, etc. that resemble nature without using concrete. In this case, in order to prevent water from seeping into the ground, when creating a pond or stream, an impermeable waterproof sheet is laid underground, and then covered with soil or embanked. However, simply laying down a water-impermeable sheet will cause water to leak from the seams of the sheet, making it impossible to obtain a sufficient waterproof effect. Therefore, when the water supply decreases,
The disadvantage is that the water in ponds and streams dries up. In addition, basements of buildings also have the disadvantage that water leaks from concrete joints, separators, and cracks, making the interior wet. For this reason, even if the building is waterproofed with an impermeable tarpaulin sheet, it cannot be nailed down because the building has many elevations.

[0003] Therefore, methods of fusing or gluing the seams of sheets have been attempted. However, special equipment is required to fuse the seams after the sheets are spread on the soil surface. Furthermore, the method of bonding using an adhesive requires manpower to apply the adhesive, overlap the sheets, etc., and it is very difficult to achieve perfect bonding. For this purpose, the bonded parts are arranged in two rows, and air is blown between them, or conversely, a vacuum is applied to check for incomplete adhesion by checking for air leaks or pressure changes.If repairs are required, the situation becomes even more complex. This has the drawbacks of longer construction times and higher costs.

0004

[Means for Solving the Problem] The present inventors completed the present invention as a result of conducting research on a construction method for an impermeable waterproof sheet that is easy to work, does not require manpower, and can prevent water leakage. did. The present invention is an impermeable waterproof sheet characterized in that, when laying several sheets of water-impermeable waterproof sheets, the peripheral portions of each sheet are overlapped, and a layer of water-swellable material is provided between the sheets in the overlapped portion. This is a method of constructing a water-permeable tarpaulin sheet. The present invention further provides a method for constructing a water-impermeable waterproof sheet, characterized in that the water-impermeable waterproof sheet is nailed to a wall such as concrete, and a layer of water-swellable material is provided between the waterproof sheet and the wall. It is.

Preferred materials for the water-impermeable waterproof sheet used in the present invention are rubber, vinyl chloride, polyethylene, rubber-polyethylene copolymers, and particularly high-density polyethylene. These materials contain additives such as sulfur, plasticizers (D
OP), carbon black, pigments, etc. The thickness of the sheet is 0.2-6mm, especially 0.5-3mm
degree is preferred.

Examples of water-swellable substances include swelling clays such as montmorillonite, nontronite, saponite, hectorite, and beidellite, and organic clays made by organicizing these clays with surfactants such as quaternary ammonium, such as commonly known as organic bentonite. Organic hectorite etc. are used. As the swellable synthetic polymer, water-absorbing polymers such as swellable rubber, polyacrylate, polyvinyl alcohol, CMC, polyacrylamide, and polyoxyethylene can also be used. Other additives may be mixed in to improve fluidity, viscosity, etc.

[0007] As the water-swellable substance, it is preferable to use bentonite whose main component is montmorinite. Bentonite contains approximately 65 to 80 SiO2 as a constituent component.
%, AI2 O3 about 12-16%, Fe2 O3 about 1-4%, CaO about 1-4%, MgO about 1-3%, K2
It contains about 0.5-2% O and about 2-4% Na2O. The swelling degree of bentonite is usually 2 to 20 g/g (24
hr). Bentonite absorbs water, swells, and has a self-repairing action that seals leaks and forms a strong waterproof structure.

[0008] When carrying out the present invention, the soil at a planned site for an artificial pond, stream, etc. is removed and an impermeable drainage sheet is constructed. The overlapping portion of each sheet is usually 3 to 20 cm, preferably 10 cm. A layer of water-swellable material is then provided between each sheet of the overlapping portion of the sheets. To form a water-swellable material layer, a small amount of water, an organic solvent, etc. may be added to the water-swellable material to form a paste, and this may be applied to the surface of the sheet. It is preferable to use it by molding it. To form water-swellable materials,
A woven fabric, nonwoven fabric, paper, etc. may be used as a core material, and a water-swellable substance may be adhered to both sides of the core material, or an adhesive may be added to the water-swellable substance and formed into a flat plate.

Although powder may be used as the water-swellable substance, it is preferable to use granules with a particle size of 0.5 to 7 mm, particularly 1 to 5 mm. In order to adhere a water-swellable substance to a core material, the adhesive may be diluted with an organic solvent and then applied to the core material, and the water-swellable substance may be sprinkled on top of the adhesive. After spraying a diluted adhesive solution thereon, the core material may be placed and pressed. By connecting the steps of immersing the core material in a diluted adhesive solution, spreading the water-swellable substance almost uniformly onto the core material, pressing the water-swellable material and the core material with a roller, etc., and the drying step. , it is possible to continuously produce flat plate shaped bodies.

Alternatively, the water-swellable material may be placed in a flat mold, a diluted adhesive solution may be sprinkled onto the mold, and then the molded material may be pressed. It is preferable to provide an adhesive layer on both sides of the flat molded product and attach a release paper to it. After a layer of water-swellable material is provided between the sheets, the sheets are temporarily secured with staples, nails, etc., and 30 to 50 cm of soil is covered, embanked, etc. on top of the sheets.

[0011]

【Example】

Test Example 1 The ground was dug in the shape of a ship's bottom, approximately 2 m long, approximately 1.5 m wide, and approximately 1 m deep in the center, and the soil was removed to make the surface flat. thickness 2
Cut a mm polyethylene sheet into 1 x 1 m pieces, approximately 8 cm.
They were spread on the surface so that they overlapped each other. A molded product with non-woven fabric as the core material and granular bentonite adhered to both sides was cut into 7cm wide and 5m long pieces, and this molded product was inserted between the seams of each sheet, and the sheets were stacked.
I temporarily secured it with staples. This was covered with approximately 20 cm of soil, and the surface of the soil was pounded with a board to make it flat and create an artificial pond. A rod with a concrete block was placed in the center of this artificial pond, water was poured to a depth of approximately 80 cm, and one hour after water was added, a mark was placed on the water surface of the rod.The next day, the water level was checked to see if it had dropped. Almost no decrease was observed. Test Example 2 6 to 16 mesh bentonite and SBR (styrene butadiene rubber) latex were mixed at a ratio of 6:1 to form a plate with a thickness of about 6 mm, and a butyl acrylate adhesive was applied to both sides of the plate. , covered with release paper to create a strip of water-swellable material 7 cm wide and 8 m long. When attaching the first sheet to the outside wall of the basement of the building, a water-swellable material with the release paper removed was sandwiched between the concrete and the water-impermeable tarpaulin sheet, and nailed into place. Next, the release paper was removed and pasted on the sides of this waterproof sheet, and a second water-impermeable waterproof sheet was overlapped by 10 cm and the overlapped portions were fastened with nails in two rows. After this, the area was refilled and the area was buried twice a day for 10 days.
For some time, water was poured over the soil. After pouring water on the 10th day, the soil was removed, the sheet was peeled off, and the wetness of the concrete surface was observed, but the concrete surface was not wet. Test Example 3 Three wooden boxes each having a side of 180 cm and a depth of 90 cm were made, and a rubber waterproof sheet was placed inside each box. The first box was made by nailing the rubber tarpaulin sheets at intervals of about 10 to 15 cm, with an overlap of 10 cm. The second box has a water-swellable sheet in the overlapping area (same as Test Example 2)
I clipped it on and nailed it in place. The third box was made in the same way as the second box, and the overlapping part was nailed with an aluminum bar 3 cm wide and 2 mm thick to cover the gap between the nails. Next, tap water was gradually poured into each of these boxes to a depth of 65 cm. As a result, water immediately started leaking from the bottom of the first box. The bottom of the second box became wet about 3 hours after the water was first poured. Third
The bottom of the box was still dry the next day. It was assumed that water was leaking from the seam of the rubber tarpaulin sheet in the second box, so when we sprinkled granules of water-swellable material in this area, we found that water was leaking from the seam of the rubber tarpaulin sheet. The water-swellable material was introduced and after 3 hours the bottom of the box began to dry.

0012

[Effects of the Invention] According to the method of the present invention, there is no need for work such as fusing or gluing the seams of the water-impermeable waterproof sheet.
Work time can be significantly shortened, and excellent waterproofing effects can be obtained.

Claims (2)

[Claims] [Claim 1] When laying several water-impermeable waterproof sheets, the peripheral portions of each sheet are overlapped, and a layer of water-swellable material is provided between the sheets in this overlapped portion. Construction method of impermeable waterproof sheet. [Claim 2] Construction of a water-impermeable waterproof sheet, characterized in that the water-impermeable waterproof sheet is nailed to a wall such as concrete, and a layer of water-swellable material is provided between the waterproof sheet and the wall. Law.