JPS6343229Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flat drainage board used in the paper drain method for soil improvement of soft ground containing moisture.

Conventionally, this type of paper drain drainage board has been made by providing protrusions on a thermoplastic synthetic resin plate, making holes in the protrusions, and covering the outside with hydrophobic non-woven fabric, etc., or by wrapping synthetic resin monofilaments, or by using water guide plates. There were things in which the filaments were covered with non-woven fabric, and things in which cuts were made in a board and stretched to form a mesh, which was then covered with a perforated film.
In either case, the permeable area for drainage is small, or the resistance to earth pressure is weak. There is no one that has both the functions of being able to quickly release water that is taken in to the outside of the soil, and those that can withstand earth pressure lack the ability to absorb and drain water, while those that have the ability to absorb and drain water lack the ability to withstand earth pressure. It had drawbacks.

The present invention improves these shortcomings, has sufficient strength to withstand the earth pressure applied to the planar drainage board, and also quickly takes in a large amount of water in the soil into the planar board. This invention relates to a flat drainage board that has a structure that allows water to be discharged out of the soil more quickly.

The present invention will be explained below based on the drawings.

What is shown in FIGS. 1 and 2 shows one embodiment of the present invention. Convex portions 2 in which the planar wide net 1 is protruded in some places from the net surface in a convex shape.
This figure shows a planar drainage plate P formed by attaching a highly water-permeable filter cloth 3 as a water collecting material to the outer surface of the top part 5 of the convex part 2.

The shape of the convex portion 2 in this example is an example of a truncated cone shape in appearance, and the bottom circumference is slightly larger than the head circumference. Since this part functions to withstand external earth pressure applied to the flat part of the flat drainage board of the present invention, a shape that satisfies the resistance is selected. That is, the height, wall thickness, spacing, etc. are determined by taking into consideration the economical efficiency of the flat plate. In addition, Figures 1 and 2
The figure shows an example in which the convex portions 2 are arranged on a plane plate by arranging them vertically and horizontally. FIG. 2 shows a cross section taken along the line CC in FIG. 1.

In the one shown in FIG. 3, the shape of the convex part 2 provided on the net 1 is a truncated pyramid in appearance, and the net 4 as a water collection material is attached to the outer surface of the top part 5 of the convex part 2.
This is an example in which a composite B consisting of a water-permeable filter cloth 3 and a water-permeable filter cloth 3 is joined, and the convex portions 2 are arranged at staggered intervals in the vertical and horizontal directions of the plane drainage plate surface. FIG. 4 is a sectional view of the drain plate shown in FIG. 3 taken along the line C-C.

In Fig. 5, the shape of the convex part 2 is a truncated polygonal pyramid, a net 4 as a water collection material is connected to the top part 5, and the lower part of the net 1 having the convex part 2 has water permeability. FIG. 6 shows an example of the filter cloth 3 joined together, and is a sectional view taken along the line C-C.

The material of the net used for the drainage board of this invention is
A hard synthetic resin, ie, a synthetic resin with high rigidity, is used. For example, resins such as PP, HDPE, and hard PVC are mainly used. Regarding the mesh size of the net, the size of the net wires should preferably be smaller than the area of the space created by it, and the net shape In this case, the wires may have a mesh shape in which the crossing angles of the wires are diagonal, instead of being at right angles as shown in the example.

The convex portion may be integrally molded with the net, or may be jointly molded by some other method. As shown in the examples, the shape of the convex portions may be any shape, and the height and spacing of the convex portions are determined depending on the water collection and water permeability within the flat drainage board and when the flat board is buried in the soil. Arrangements and spacing suitable for earth pressure etc. are used as appropriate. Furthermore, even if very small or few holes are provided in this convex part so that the collected and retained water in the convex part can be exchanged with the water in the other parts of the flat drain plate, the flat drain plate will not be able to withstand external pressure. It may be provided as long as it does not have a large effect.

As explained in the above embodiment, the water collecting material can be roughly divided into water permeable material 3, net 4 made of synthetic resin wire, and composite B consisting of both 3 and 4.

Permeable filter media include nonwoven fabrics made of synthetic resin, collections of natural or synthetic fibers, felt, and breathable foam materials, depending on the soil quality and drainage board of the location where the drainage board is used. The appropriate one is selected and used depending on the method of backfilling after burial work.

As explained above, in the flat drainage board of the present invention, the shape of the water collection part is made into a net shape, so the plane cross-sectional area of the net wire part is much smaller than the plane area of the other void parts. In order to collect the moisture inside the flat plate, the water collection area becomes wider,
It has an unprecedented effect of being able to collect a large amount of water very quickly, and since the convex part has a flat top, it can completely connect water-permeable filter cloth and synthetic resin wire nets. Moreover, when the drainage board is buried in the soil, it can withstand external pressures applied to the drainage board surface, such as the earth pressure applied to the drainage board and the pressure of the wheels applied on top of it, and maintains a flat surface. The convex portion's convex shape maintains the ability to withstand this without being crushed.This ensures the passage of water within the flat plate, which improves the water absorption capacity and the internal capacity of the flat plate. Since the water retention capacity and the drainage capacity when draining this water increase, the water in the soil can be drained while maintaining the strength to withstand external pressure such as earth pressure and wheel pressure that is applied to the flat drainage board. Incorporate it into the flat drainage board more quickly,
Moreover, the amount retained in the drainage board is large, and
It can be said to be a very effective flat drainage board that can quickly drain this water out of the soil and can drain a large amount of water.

Moreover, since the convex part serving as a spacer is a pot-shaped convex part, it can be buried vertically, horizontally, or diagonally when it is laid underground, and drainage does not occur even if it is buried in either direction. Since there is no adverse effect on performance, there is no restriction on the direction of burying, and the burying can be done in any direction.

[Brief explanation of the drawing]

FIG. 1: - An embodiment of the flat drainage plate of the present invention. FIG. 2: - Cross-sectional view taken along the line C-C of the same as above. Figure 3:-
FIG. 3 is another embodiment of the flat drainage plate of the present invention. Figure 4:-
A sectional view taken along the line C-C of the same as above. Figure 5: - Another embodiment of the flat drainage plate 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 convex part, 3...Water permeable filter cloth, 4...Net, 5...Top of convex part, A...Net having a convex part, B...
...Composite of net and water-permeable filter cloth, P...Planar drainage board.

Claims (1)

[Scope of utility model registration request] This planar drainage board is made by joining a net 1 made of a hard synthetic resin wire material with a convex convex part 2 having a flat top on one side and a water collecting material joined at the top part 5 of the convex convex part 2.