JPS605085Y2 - drain paper - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to drain paper used for improving soft ground.

As shown in FIG. 5, for example, a type of drain paper has been proposed in which grooves 3 on both sides of a corrugated sheet 2 are closed with a water-permeable sheet 1.

However, when the above-mentioned drain paper is subjected to excessive pressure from the soil side or when it is necessary to mechanically dewater the soil at zero pressure for the purpose of highly improving soil bearing capacity, the above-mentioned drain paper is used as a permeable sheet due to the pressure from the soil side. 1 was pushed into the grooves 3, causing breakage of the sheet 1 and narrowing of the grooves 3, resulting in the loss of its function as a drain paper.

An object of the present application is to provide a drain paper that does not lose its function as a drain paper even if the water-permeable sheet is damaged or the grooves are narrowed.

This application describes a corrugated plate 2 in which parallel grooves 3 and 3a are alternately formed on both sides.
A substrate 4 is formed by closing the opening on one side with a water-permeable sheet 1, and a water passage hole 6 is opened in the groove 3a where the opening is closed, and the substrate 4 is folded in half or made into two sheets. The feature is that the substrates 4 are overlapped and the protrusions 5 between the mating grooves 3 and 3 are made to face each other's grooves 3, and when the substrates 4 are placed in the soil, the protrusions 5 of each other are caused by the earth pressure to close to the mating groove. A narrow water passage 7 that is parallel to the groove 3 is formed between the protrusion 5 and the groove 3 by engaging with the groove 3, so that even if the sheet is damaged or the groove 3 is narrowed, the water passage 7 will be able to flow through the water passage hole 6. Water absorption capacity can be maintained through the water passage 7, and the function as a drain paper is not lost.

The present invention will be described in detail below based on embodiments shown in the drawings.

Fig. 1 shows a drain paper according to the present invention, in which a substrate 4 has a water-permeable sheet 1 stretched on one side of a corrugated plate 2 with grooves 3 and 3a alternately formed on both sides, and the water-permeable sheet 1 faces outward. It is formed by folding the image in half along the groove 3 and joining the leading edge of the image.

The corrugated plate 2 is formed by extrusion molding of thermoplastic resin such as polyethylene or polypropylene as shown in FIG. , 3 has a trapezoidal shape.

The width of the top of the protrusion 5 is slightly larger than the width of the bottom of the groove 3.

Water passage holes 6 penetrating from the front and back are provided at appropriate intervals in the tops of the respective grooves 3a on one surface of the corrugated plate 2, that is, the protrusions 5 when viewed from the other surface.

The water passage hole 6 is an elongated hole that is long in the direction in which the drain paper is driven, that is, in the direction of the protrusion 5, so that the strength of driving the drain paper does not decrease even if the hole area is increased.

The water-permeable sheet 1 is made of a material with good water permeability, such as a nonwoven fabric, and is bonded to the corrugated plate 2 so as to close the opening surface of the groove 3a in which the water passage hole 6 is formed.

Fold the substrate 4 in half with the water-permeable sheet 1 facing outward,
The grooves 3 and the mating protrusions 5 are made to face each other, and both ends of the substrate 4 are bonded.

When the drain paper is placed in the soil, the projection 5 fits into the mating groove 3 due to earth pressure as shown in FIG. 2, and a water passage 7 is formed between the projection 5 and the groove 3.

Water that has penetrated the water-permeable sheet 1 and entered the grooves 3a flows into the water passage 7 through the water passage holes 6 of the groove 3a, and rises in the water passage 7 by capillary action.

Even if the water-permeable sheet 1 is damaged or the grooves 3a are narrowed, the capillary action of the passageway 7 formed between the stacked corrugated plates 2, 2 is not impaired, and the function as a drain paper is not lost.

In the case of the above embodiment, one substrate 4 was folded in half to form the drain paper, but the invention is not limited to this, and the drain paper is folded in two.
It is also possible to stack two substrates with the water-permeable sheets 1, 1 on the outside.

Further, the cross-sectional shape of the protruding ridges 5 of the corrugated plate 2 is not limited to a trapezoid, and various shapes can be implemented, such as a semicircle or a shape corresponding to an involute gear curve or a cycloid gear curve as shown in FIG.

In the case of Fig. 4, when the substrates 4 and 4 overlap, the corrugated plate 2,
The water passage 7 formed between the two has a longer circumference than the cross-sectional area of the water passage 7, which increases the capillary action and improves the function of the drain paper.

As described above, in the present invention, when the corrugated sheets 2 overlap, the water passage 7 is formed between the corrugated sheets 22, and water flows into the water passage 7 through the water passage holes 6 formed in the corrugated sheet 2 and absorbs water by capillary action. Therefore, even if the water-permeable sheet 1 is damaged or the grooves 3a are narrowed, it will not lose its function as a drain paper.

Further, it has excellent effects such as being easily formed by folding the substrate 4 in half or by stacking two substrates.

It should be noted that the present invention is not limited to the above-mentioned configuration, and it goes without saying that various modifications can be made within the technical scope of the claims of the utility model registration.

[Brief explanation of the drawing]

Figure 1 is a slope view of the drain paper, Figure 2 is a sectional view of the used state, Figure 3 is a slope view of the corrugated plate, Figure 4 is a sectional view of another embodiment, and Figure 5 is a slope view of two conventional examples. It is a diagram. 1... Water-permeable sheet, 2... Corrugated sheet, 3,
3a... Grooves, 5... Protrusions, 6...
...Water hole.

Claims (1)

[Claims for Utility Model Registration] ■ The opening surface of the grooves 3a on one side of the corrugated plate 2, which has parallel grooves 3 and 3a alternately formed on both sides, is closed with a water-permeable sheet 1,
A substrate 4 with water holes 6 penetrating the front and back sides of the groove 3a whose opening surface is closed is placed on the groove 3 with the water-permeable sheet 1 on the outside.
Fold the two substrates 4, 4 in half along the same line, or stack the two substrates 4, 4 with the water-permeable sheet 1.1 on the outside so that the protrusions 5 between the grooves 3, 3 of each other face each other. Characteristic drain paper. (2) The drain paper according to claim 1, wherein the water passage holes 6 are elongated holes extending in the direction along the grooves 3. (2) The drain paper according to claim 1 or 2, wherein the cross section of the protrusion 5 corresponds to an involute gear curve or a cycloid gear curve.