JPS5923072Y2 - Underdrain drainage material - Google Patents

Description

[Detailed explanation of the idea] This invention relates to the improvement of underdrain drainage materials.

Water in soil is essential for the growth of crops, but excessive water causes unfavorable results such as poor growth of crops and the occurrence of diseases.

Conventionally, in order to remove water from the soil, it has been done to create an underdrain by burying stone gravel, bamboo with removed knots, or bundles of grass.

Furthermore, it has recently become known to bury waste materials such as polystyrene foam.

However, these underdrains have the disadvantage that they cannot drain water evenly over a long period of time because they become clogged with heavy clay soil or lose water permeability due to corrosion.

Underdrains with grooves made of polystyrene foam or the like can similarly become clogged, particularly when fine roots of plants grow in and clog the grooves, reducing drainage efficiency.

As a result of repeated research to obtain an underdrain drainage material that would not be blocked by fine roots of plants, would not reduce drainage efficiency, and would permanently perform its drainage function, the inventor found that by providing a through hole in the center, They found that it could be improved and completed the present invention.

The present invention is made of a hard synthetic resin foam, with a drainage groove recessed on the longitudinal side and a through hole bored in the center.
Further, the gist of the present invention is a culvert drainage material having a roughly elliptical cross-section and characterized in that communication holes are provided at appropriate intervals to connect the through holes and the drainage ditch.

Examples of the hard synthetic resin foam used in the culvert drainage material of the present invention include polystyrene, polyethylene, polypropylene, or copolymer resin foams of these resins, polyvinyl chloride foams, and rigid polyurethane foams. I can do it.

Among these, foams of polystyrene or styrene copolymer resins mainly composed of styrene are most suitable because they have excellent moldability, processability, and the like.

To explain it with a drawing, the underdrain drainage material of the present invention is a molded image made of polystyrene foam, and there are two upper and lower parts in the center.
The separated half-shaped materials are joined or glued together to form a single underdrain drainage material.

In the drawings, reference numeral 1 denotes a plurality of drainage grooves that are recessed in parallel to the longitudinal side surface of the underdrain drainage material.

Reference numeral 2 denotes a circumferential groove, which is recessed in the circumferential direction of the underdrain drainage material and connects the drain groove 1.

A through hole 3 is provided in the center of the culvert drainage material in parallel with the longitudinal direction, and a communicating hole 4 is provided at an appropriate interval between the drain groove 1 and the through hole 3.

As shown in FIG. 3, the above-mentioned culvert drainage material is covered with a water-permeable sheet 5, and the necessary number of them are buried in series.

As the water-permeable sheet 5, a net-like material made of natural fibers or synthetic fibers, a nonwoven fabric, or the like is used.

In addition, when joining the half-shaped materials that are divided into upper and lower parts, it is preferable to shift the positions of the ends and join them, because when a large number of them are installed in a row, it is possible to connect them straightly and firmly.

At this time, it is desirable that the upper and lower positions of the circumferential groove 12 are aligned.

The underdrain drainage material of the present invention has the above-mentioned configuration, and has, for example, a height of 14-40 cm, a width of 16-20 cm, and a length of 409 cm.
They have a size of 0.0 cm and a roughly elliptical cross section, and are buried in the required number at intervals of 7 to 15 m.

To bury this culvert drainage material, for example, the width is 30-50 cm.
A trench with a depth of 70 to 100 cm is excavated, and the above-mentioned underdrain drainage material is covered with a hydrophobic covering material to a depth of about 10 cm or more and buried.

As hydrophobic covering materials, gravel, gravel, bamboo, rice husk, etc. are used, but cut scraps, fragments, etc. of synthetic resin foam such as polystyrene foam, or foamed particles are lightweight and difficult to handle. It is the most suitable because it is easy to use, has no fear of corrosion, and has good water permeability.

The underdrain drainage material of the present invention has a drainage groove 1 in its longitudinal direction,
In addition, a through hole 3 is provided in the center, and a communication hole 4 that connects the drainage ditch 1 and the through hole 3 is bored, so water in the soil can be drained from the drainage ditch 1, the circumferential groove 2, and the communication hole 4. The water is discharged through the through hole 3 to the outside.

Even if fine roots of plants invade the drainage ditch 1 and partially obstruct its water permeability, the water is well drained from the through hole 3 through the communication hole 4, so the drainage function is extremely good.

Since fine roots of plants do not enter the through hole 3, the drainage function is not weakened.

Therefore, once buried, wastewater treatment can be performed permanently, and the through hole 3 occupies a relatively large space, so the amount of resin used as a whole can be reduced, which is extremely advantageous economically.

FIG. 4 shows an example in which drain grooves 6 are further recessed on the upper and lower surfaces of the underdrain drainage material in the above example. By providing the drain grooves 6 on the upper and lower surfaces in this way, drainage can be further improved. This is advantageous because the functionality can be improved and the amount of resin used can also be reduced.

[Brief explanation of the drawing]

The drawing shows an example of the culvert drainage material of the present invention.
The figure is a perspective view, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a perspective view of an underdrain drainage material covered with a water-permeable sheet. FIG. 4 is a longitudinal cross-sectional view of another culvert drainage material. The main symbols in the drawings are as follows. 1...Drainage groove, 2...Peripheral groove, 3...
...Through hole, 4...Communication hole, 5...
Water-permeable sheet, 6...Drainage ditch.

Claims (1)

[Scope of utility model registration request] 1. It is made of a hard synthetic resin foam, has a drain groove recessed in the longitudinal side, a through hole in the center, and connects the through hole and the drain groove at appropriate intervals. A culvert drainage material with a roughly elliptical cross section characterized by the provision of communication holes. 2. The underdrain drainage material according to claim 1, which is a registered utility model and is formed by connecting drainage grooves and having a circumferential groove recessed on the circumferential side. 3. The underdrain drainage material according to claim 1, which is a utility model, and has drain grooves recessed in the upper and lower surfaces in the longitudinal direction. 4. Utility model registration claim 1, wherein the rigid synthetic resin foam is a foam of polystyrene, polyethylene, polypropylene or a copolymer resin of these resins, a polyvinyl chloride foam, or a rigid polyurethane foam. Underdrain drainage material. 5. The underdrain drainage material according to claim 1, which is covered with a water-permeable sheet such as a net made of natural fibers or synthetic resin fibers or a nonwoven fabric.