JPS6220499Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is applicable to retaining walls, tunnels, roads, culverts,
This relates to drain materials used for draining water from golf courses, irrigation canals, slopes, soft ground, etc.

BACKGROUND ART Conventionally, perforated pipes such as clay pipes and plastic pipes having many holes in their walls have been used as drain materials for underdrain drainage. However, this perforated pipe has the disadvantage that it is easily clogged, is expensive, and its performance deteriorates relatively quickly.

The present invention provides a drain material that is relatively resistant to clogging, is simple to construct, and has a low construction cost including material construction. That is, the present invention is a drain material made by wrapping a long and narrow piece of plastic sheet, which has depressions on the front and back and has many independent protrusions on both sides, in a filter.

The present invention will be explained in detail below with reference to the drawings. 1st
The figure is a perspective view showing a part of an example of the drain material 1 of the present invention, in which a long and thin piece 3 of a plastic sheet 3, which is formed by recessing the front and back alternately and forming a large number of independent protrusions 2 on both sides, is wrapped in a filter 4. It is formed.
The independent protrusions 2 are recessed on one side of the elongated piece 3 of the plastic sheet and conversely protrude on the other side, thereby giving the plastic sheet bulkiness in the direction of its thickness. The repetition of depressions and projections does not necessarily have to be regular as shown in FIG. 1, and may be irregular as long as bulkiness can be imparted to the sheet as a whole. The thickness of this bulky plastic sheet is about 3 mm at the thinnest and about 50 mm at the thickest.

The heights of the large number of independent protrusions 2 are preferably uniform, and the ratio of the height to the maximum dimension of the bottom portion is preferably smaller than 2:1. Furthermore, it is preferable that the top of the independent protrusion 2 is flat. These things give the independent protrusion 2 resistance to compressive force in its thickness direction.

The elongated piece 3 of the plastic sheet formed as described above becomes a water passage part in the drain material 1. Water that has entered the water passage through the filter 4 flows between the independent protrusions 2.

The filter 4 has the role of wrapping the water passage part and preventing soil from being brought in when water moves from the soil to the water passage part. The filter 4 may be made of woven fabric, knitted fabric, non-woven fabric, or paper, but it is best to use a material that does not disintegrate in the soil for a long time, such as nylon, polyester, polypropylene, or polyester. Synthetic fibers such as vinylidene chloride are preferred. The filter 4 may be glued or heat-sealed to the strip 3 of the plastic sheet at the top of the independent protrusion 2.

An example of the use of the drain material of the present invention will be explained in the case of underdrain drainage. In FIG. 3, the drain material 1 of the present invention is buried with sand 6 with the inner plastic sheet 3 oriented vertically, that is, with the protrusions 2 oriented horizontally, and top soil 7 is placed on top. Since the cross section is vertically long, the width of the buried trench may be narrow. Also, when burying perforated drain material for earthen pipes or plastic pipes, you can bury it with crushed stone, place sand on top of it, and then cover the top soil. It can also be omitted.

FIG. 2 is a perspective view showing a part of another example of the present invention, which is a long and slender piece of a plastic sheet having many through holes 5 on its entire surface and indented alternately on the front and back to form a large number of independent protrusions 2. 3 to filter 4
This is a drain material 1 which is formed by wrapping it in. Since the drain material 1 in this case has water permeability in the upper, lower, left, right, and front and back directions in FIG. 2, a more efficient water draining action can be expected.

The material of the plastic sheet constituting the drain material 1 illustrated in FIGS. 1 and 2 may be any hard and thermoformable plastic, such as hard polyvinyl chloride, polystyrene, polyethylene, polypropylene, Polyvinylidene chloride, nylon, polyester, etc. are used. Specifically, plastic sheets, plastic nets, rigid nonwoven fabrics, or plastic sheets with a large number of holes made of these materials are used.

As mentioned above, the drain material of the present invention is a plastic sheet with water-permeable parts recessed on both sides and a large number of independent protrusions on both sides, so it has sufficient water permeability and appropriate rigidity and flexibility. have In addition, since the elongated piece of plastic sheet that serves as the water passage section is wrapped with a filter, water can be allowed to enter from the entire surface of the drain material without bringing dirt and sand into the water passage section. Therefore, an economical drain material that is relatively difficult to clog and is easy to install is provided.

Since the drain material of the present invention has the above-mentioned characteristics,
Those with relatively thick water passages are used for culvert drainage, slope drainage, and field drainage, while relatively thin ones are used for backfilling of retaining walls, horizontal drains, vertical drains, etc. can.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a part of an example of the drain material of the present invention, Fig. 2 is a perspective view showing a part of another example, and Fig. 3 is a perspective view showing a part of an example of the drain material of the present invention. FIG. 1...Drain material, 2...Independent protrusion, 3...Elongated piece of plastic sheet, 4...Filter,
5...Through hole, 6...Sand, 7...Top soil.

Claims (1)

[Claims for Utility Model Registration] (1) A drain material made by wrapping a long thin piece of plastic sheet with a filter, which has depressions on both sides and a large number of independent protrusions on both sides. (2) The drain material according to claim 1, wherein the plastic sheet has a large number of through holes. (3) The drain material according to claim 1 or 2, wherein the ratio of the height of the independent protrusion to the maximum diameter of the bottom is smaller than 2:1.