JPS6220501Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a flat drainage board with an impermeable sheet for preventing the inflow of cement milk, which is used in the construction of concreted roads, retaining walls, waterway structures, tunnels, etc.

Conventionally, this type of flat drainage board with a water-impermeable sheet has been made of a thermoplastic synthetic resin board with protrusions and holes, and a water-impermeable film or sheet, or a synthetic resin monofilament board. There were some methods in which the water guiding stripes were tied together, or the water guiding stripes were covered with non-woven fabric etc. and a film water stop layer was provided on one side.
All of them have various drawbacks such as having a small permeation hole area, low drainage capacity, and weak crushing force to withstand earth pressure, etc., and the earth pressure etc. required for this type of drainage board. There is no material that has both the functions of absorbing water from the soil into the board more quickly and releasing it to the outside of the soil. They lack drainage ability, and those that have absorption and drainage ability lack crush resistance.

The device of this invention improves these shortcomings and has sufficient strength to withstand the external pressure applied to the drainage board, while also allowing more water to be absorbed from the soil into the drainage board more quickly. This is a flat drainage board with an impermeable sheet that has a structure that allows water to be discharged to the outside of the soil.

Hereinafter, the present invention will be explained based on illustrated examples.

FIG. 1 shows an embodiment of the present invention, in which a planar wide net is provided with convex portions 2 in which the convex portions 2 are protruded in some places from the net surface in a concave shape, and the tops of the convex convex portions 2 are provided. A water-impermeable sheet 3 is bonded to the outer surface of 5 to form a flat drainage plate P. In this example, the convex portion 2 has a truncated conical shape in appearance, and the circumference of the bottom portion is slightly larger than the circumference of the head. Since this part acts as a resisting pressure such as external earth pressure or ring pressure applied to the flat drainage plate, a shape that satisfies its crushing resistance is selected and used. That is, the height, wall thickness, spacing, arrangement, etc. are determined by taking into consideration the economical efficiency of the flat drainage board. The one in FIG. 1 is an example in which the protrusions 2 are arranged on a plane plate in such a way that they are aligned in the vertical and horizontal directions. FIG. 2 is a sectional view taken along the line C--C of FIG. 1.

Fig. 3 shows an example in which the shape of the convex portion 2 is a truncated pyramid, and the convex portions are arranged in a staggered manner on the plane plate, and Fig. 4 shows the C-C cross section thereof. This shows that.

In the one shown in FIG. 5, the shape of the convex portion 2 is a truncated polygonal pyramid and is arranged in a staggered manner, and FIG. 6 is a sectional view taken along the line C-C.

The material of the net used in the drainage plate of the present invention is a hard synthetic resin, that is, a highly rigid synthetic resin. For example, resins such as PP, HDPE, and rigid PVC are mainly used. Regarding the size of the mesh of the net, it is preferable that the size of the net wires is smaller than the area of the space formed thereby. As for the shape of the net, other than the one in which the intersecting angles are at right angles as illustrated, it may be a mesh shape in which the intersecting angles are diagonal and have different intersecting angles.

The convex portion may be integrally molded with the net, or may be jointly molded by another method. As shown in the examples, the convex shape may be any shape, and the height and spacing of the convex portions will depend on the water retention and water flow within the flat drainage board, the earth pressure when the flat board is buried in the soil, etc. It can be determined to suit. Furthermore, very small or few holes may be provided in this convex part so that the water collected and retained in the convex part can be exchanged with the water in the other part of the flat drain plate, and the flat drain plate can withstand collapse pressure against external pressure. It may be provided as long as it does not have a large effect on the

As the material of the water-impermeable sheet, a synthetic resin film or sheet is used, and it is more convenient to use the same material as the convex net material A for joining. The thickness of the sheet is determined by taking into consideration the height, spacing, arrangement, and crushing pressure of the convex portions.

As explained above, in the plane drainage board with an impermeable sheet of the present invention, the water collecting part has a net-like shape, so the planar cross-sectional area of the net wire part is much larger than the planar area of the other void parts. Because it is small in size, the water in the soil can be collected in the flat plate, but the water collection area is wide, so it can collect a large amount of water very quickly, which is an unprecedented effect. When the department buries a drainage board in the ground, it can withstand the earth pressure applied to the drainage board and the external pressure applied to the drainage board surface, such as wheel pressure applied on top of it, and the flat surface will not be crushed. The force to withstand this can be maintained by the convex shape of the convex part, and a sufficient passage of water within the flat drainage board can be secured, increasing the water collection and water retention capacity, as well as the drainage of this water to the outside. Eventually, the drainage capacity will increase.
While maintaining the strength to withstand external pressure such as earth pressure and circular pressure applied to the flat drainage board, water in the soil can be drawn into the drainage board more quickly, and moreover, a large amount of water can be retained within the drainage board. Furthermore, it can be said to be a planar drainage board that has a very large effect in that it can quickly drain water to the outside of the soil and can drain a large amount of water.

[Brief explanation of the drawing]

FIG. 1: - An embodiment of the flat drainage plate with an impermeable sheet of the present invention. FIG. 2: - Cross-sectional view taken along the line C-C of the same as above. Figure 3: - Another embodiment of the flat drainage plate with an impermeable sheet of the present invention. Figure 4:-C-C as above
Sectional view at the section. Figure 5: - Another embodiment of the flat drainage plate with an impermeable sheet of the present invention. FIG. 6: - Cross-sectional view taken along the line C-C of the same as above. DESCRIPTION OF SYMBOLS 1...Net, 2...Cop-shaped protrusion, 3...Water-impermeable sheet, 5...Top of the pot-shaped protrusion, A...
Net with convex convex portions, P...Flat drainage board with impermeable sheet.

Claims (1)

[Scope of utility model registration request] A flat drainage board with an impermeable sheet, which is formed by bonding an impermeable sheet to the top of the convex convex portion of a hard synthetic resin net having convex convex portions.