JPS58123914A - Water permeable sheet - Google Patents

Abstract

PURPOSE:To provide an appropriate rigidity, flexibility, and permeability to a sheet for use with civil engineering works, by a method wherein a number of independent projections are formed on a sheet in a manner that the surface and the back dent alternately, and a number of bored holes are formed in the independent projections. CONSTITUTION:A number of independent projections 2, formed in a manner that the surface and the back dent alternately, are provided on a permeable-to-water sheet 1 comprising rigid polyvinyl chloride, polystyrene. In order to provide a well-balanced rigidity and flexibility to the sheet 1, the independent projections 2 equalize in height, and a ratio of a height (a) of the independent height 2 to a maximum diameter (b) of the bottom is preferably smaller than 2:1. A number of bored holes 3 are formed in the independent projections 2, and water permeability is provided all in directions of the surface and the back, the longitudinal direction, and the lateral direction of the sheet 1. In case it is used as a sheet for engineering works application, the projections 2 cut into earth to prevent displacement in position of the sheet 1, and in case the sheet and a water permeable material such as unwoven cloth, are laminated, it serves as a drain material having large drains.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-permeable sheet mainly used for civil engineering drainage mats.

Land 1) Drainage is one of the important elements in civil engineering works such as strengthening the foundation ground. For example, it is necessary to drain water from the back of the warm bank middle and upper walls, but in order to prevent the soil from being washed away along with the water, anti-sucking construction methods are used. In addition, a soft ground stabilization method is used in which drainage mats are laid in circles to increase the bearing capacity of the ground, such as in vertical locations. Other drainage methods include preventing slope collapse, preventing scouring, drainage from the back of tunnels, and underground drainage, all of which use drainage to conserve land and strengthen foundations.

Conventionally, various drainage materials have been used in such drainage construction methods. For example, natural materials such as wood, sand, cedar leaves, sand, wood, and cobblestone have been used since ancient times.

Recently, however, such natural materials have become depleted, and the cost of transporting materials has also risen, so round materials produced in Beguma factories have come to be used instead of natural materials.

Factory-produced drainage materials for used wood are in sheet form, such as nonwoven sheets made of synthetic fibers such as polypropylene fibers or vinylidene chloride fibers, and To
There are laminated sheets and the like, which are combinations of plastic sheets and non-woven fabrics.

By the way, conventional O-sheets have relatively high flexibility,
There is a risk that the holes may be washed away with the earth and sand, or they may cave in and become useless.

The present invention provides a sheet-like material that can be used in place of or in addition to these conventional sheet-like drainage materials and has moderate rigidity, flexibility, and good water permeability. In other words, the present invention is a sheet having a large number of independent protrusions formed by alternating depressions on the front and back sides, and this sheet is a water permeable sheet having a large number of through holes.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a part of an example of a water-permeable sheet 1 of the present invention, which has a large number of O independent protrusions 2 formed by depressions alternately on the front and back sides. The independent protrusions 2 are recessed alternately on the front and back sides of the water-permeable seam I, and the recesses cause them to protrude to the opposite side, but these recesses and protrusions do not necessarily have to be regular as shown in Figure 1. It may be irregular.

In short, it is sufficient if the water-permeable sheet 1 can have substantially alternating front and back sides within a certain area and can provide bulkiness in the thickness direction O. Therefore, it is preferable that the independent protrusions 2 are not extremely biased towards either the front or the back. Further, the large number of independent protrusions 2 may be closely spaced from each other as shown in FIG. 1, or may be formed at intervals. Furthermore, a water permeable sheet 10
In order to impart well-balanced rigidity and flexibility to the front and back sides, it is preferable that the depth of the recess on the front and back sides, that is, the height of the independent protrusions 2, be uniformly the same.

On the other hand, it is preferable that the ratio between the height a of the independent protrusion 2 and the maximum dimension diameter of the bottom part is as small as 2:1.

If it's about 1 to 1, I like that it's shaped like a Zunguri lid and has nine protrusions.

The reason for this is that the side part of the independent protrusion 2 becomes thicker than other parts during subsequent molding, and the through hole 3 is rounded and enlarged compared to before molding, and the independent protrusion 2 is This is because it becomes vulnerable to compressive force from any direction.

FIG. 2 is an enlarged end view of the 1st lIO water permeable sea) 101, and the height a of the independent protrusion 2 is 5 to 20 m,
The bottom OSB has dimensions of 10-80s+a@degree. In addition, ζolk tachimoki 2 has a roughly truncated conical shape, and its upper part is essentially '
This water-permeable sheet is convenient because it is flat and has a uniform height. For example, it has the advantage of being easily adhesive when laminated with other sheet materials. However, the above-mentioned dimensions may be changed depending on the use, and the shape may be relaxed regardless of the shape line of the nine-independent center-origin. For example, the independent protrusion 2, which is recessed in the shape of a hemispherical sphere, tends to be stretched uniformly only on the sides during molding, which will be described later. be. Other Independent Oki 2
The upper part may be circular, square, rectangular, or cylindrical.

7. The individual independent protrusions 2 are prominent when viewed from one side and depressed when viewed from the other side. In some cases, the two independent protrusions are individually erected, and a substantially horizontally connected portion 4 is left between the independent protrusions. This independence means a continuous shape like a corrugated sheet, or in other words, a ridge-like shape with a wide width.

The through holes 3 penetrate through the front and back sides of the water-permeable sheet 10, and are also present at the top, side, and bottom of the independent protrusion 2. Water-permeable seam (IK) with nine through-holes 3 arranged in a row-like manner
The material has 4 water permeability in both the front and back, front, back, left and right, i.e. horizontal directions, in the O direction.

The material for the sheet used in the present invention may be any hard, thermoformable plastic material, such as hard polyvinyl chloride, polystyrene, polyethylene (
HDPK), yj (9propylene, polycarbonate, polyvinylidene chloride, nylon, polyester, etc.) are used.Specifically, plastic nets made of these materials, rigid nonwoven fabrics, and plastic sheets with many holes are used as raw materials. Used as a sheet.

The method for manufacturing the water-permeable sheet 1 of the present invention will be explained below. A plastic sheet 5 having a large number of through holes 6 as shown in FIG. 3 is first heated above the softening point of the plastic. Next, a large number of metal rods having blunt tips, such as square or round tips, are arranged at regular intervals in a rectangular or square shape, and the heated sheet 5 is placed between the two metal rod array groups. put.

Next, by interlocking these metal rod array groups in an alternating manner, a water-permeable sheet 1 having a large number of independent protrusions 2 and a large number of through holes 3 as shown in Figure 1 is obtained.

As can be understood from the molding method, it is the side portions of the independent protrusions 20 that are stretched during molding, and the bottom and top portions are not stretched. Therefore, as described above, if the ratio between the height a of the independent protrusion 2 and the size of the bottom diameter is too large, there is a risk that the side portions may be cut or the structure may become extremely weak. Although it depends on the thickness of the sheet 5 used and the size and number of through holes 6, it is for this reason that the ratio is desirably smaller than 2:1.

Figure 4 is A-AI11 of sheet 5 in Figure 3? Front view, No. 5
The figures are the same (B-B sectional view. This sheet 5 can also be called a net, but it is thicker at the intersection of the net, which is due to the rigidity of the molded product of the present invention shown in Fig. useful for giving.

Figure 6 shows the through hole 5 from Figure 3 for ease of understanding.
This figure shows a sheet formed by the method described above, in which the through hole 3 is omitted from No. 1E.
FIG. 7 shows its cross section, and FIG. 8 is a perspective view of the raw material sheet before forming.

Since the water-permeable sheet of the present invention has a large number of independent protrusions that are recessed alternately on the front and back sides as described above, it has twice the bulkiness as compared to single-sided protrusions.

This means that if the water-permeable sheet of the present invention is given appropriate rigidity and flexibility that are well-balanced on the front and back sides, and a portion that is connected approximately horizontally is left, the elongation will be small, and and provide sufficient water permeability to the top and bottom. Therefore,
This can be advantageously used as a drainage material, ie, a mat, for civil engineering.

For example, when laying soil on a slope, the independent protrusions on the front side of the water-permeable sheet of the present invention serve to prevent the soil from flowing out, and the independent protrusions on the back side serve to prevent the soil from flowing out. It bites into the surface and prevents the mat from shifting.

Furthermore, the apex of the independent protrusion can be used as a reference for measuring the thickness of the soil.

The water-permeable sheet of the present invention may be used alone, but depending on the location and purpose of use, it may be laminated or used in combination with other water-permeable materials such as woven fabrics, knitted fabrics, nets, or non-woven fabrics. For example, a water-permeable sheet of the present invention with flat plastic nets placed as reinforcing materials on both the front and back pages and the entire sheet wrapped with a non-woven filter can be used as a drainage material. In this case, the filter is relatively g! A drainage channel with large gaps will be constructed.

The water-permeable sheet of the present invention can be used as a drainage material in civil engineering works such as land conservation and foundation reinforcement, and can also be installed as a spacer around foraged crops such as tobacco and fruit crops such as gourds. It can also be used as an agricultural material that does not come into direct contact with the ground. Furthermore, it can be laminated with a flat net to be used as a drying grid or moisture-proof mat for closets.

In addition, in combination with relatively thick non-woven fabrics or woven fabrics, it can be used as a heat insulating material for golf course grass, tennis court heat insulating material, etc. as an alternative to mulch.

Furthermore, by laminating it on the back side of a water-permeable artificial lawn, an artificial lawn with drainage performance can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows a part of the water-permeable sheet of the present invention.
ffi There are two chain chains, one side view of the hand. Figure 3 shows a rounded raw material sheet for forming the water-permeable sheet of the present invention, with lines AA and B- in Figure 4 and Figure 5, respectively.
It is a sectional view of B. Figure 6 is the previous version with the through holes omitted from Figure 1;
The figure is a new view, and the striped figure 8 is a perspective view of the raw material sheet before forming. l...Water-permeable sheet 2...Independent protrusion 3...Through hole Figure 1 Figure 2 Figure 4 Figure 6 Figure 8 Procedural amendment, June 25, 1939 Director General of the Patent Office 1 Display of case 1171157 Tatami m No. 4486!2 Salt name of the invention Water permeable sheet 3, Person making the amendment Relationship with the case 1 [Person Address (044) Asahi Shizurikatsu Nikinsha Name (Name) 4. Agent name (700?) Benrushi Hisamon -
5 Date of amendment order Voluntary amendment 6 Number of inventions increased due to sleeve correction The scope of claims column of the specification is corrected as follows f3゜(
1) A water-permeable sheet having a large number of independent protrusions formed in depressions at the surface and a large number of through holes at the independent center of the sheet. (2) The ratio between the height of the independent protrusion and the maximum dimension of the bottom is 2;1
112. The water-permeable sheet according to claim 111, which is smaller than . (!1) The water-permeable sheet according to claim 1, in which the upper portions of the independent protrusions are flat. (4) The water-permeable sheet according to claim IIE1, wherein the independent protrusions have a truncated pyramid shape or a semicircular shape. (5) The water-permeable sheet according to claim S, wherein the heights of the large number of independent 111 elements are uniform on the front and back sides. :1. (6) The water permeable sheet according to claim 11111, wherein the through holes are present at the top, side and bottom of the independent protrusion. ” The specification, page 2, line 6, is corrected as follows. "This invention is mainly used as a drainage material in civil engineering work or
Used for reinforcing and activating soil” & Specification, wL7 page 7
Insert the following text between line 8 and line 8. "Other metal plates that can be cooled, such as steel plates. Tied metal or metal lath with a large number of holes drilled in aluminum F. Insert the following sentence between page 7, line 19 and the last line of the book. ), heating is unnecessary.''& Insert the following sentence between lines 6 and 4 on page 10 of the specification. "Also, by burying the water-permeable sheet of the present invention in the soil of an embankment, the soil can be reinforced."

Claims (1)

[Scope of Claims] (1) A sheet having a large number of O independent protrusions formed by recesses on the front and back sides, characterized by having a large number of through holes in the upright portion of the ζO sheet O1k. Water permeable sheet. (2) The ratio of the maximum dimension diameter of the upper part of the independent protrusion to the bottom part is 2 =
The water-permeable sheet according to claim 1 of patent claim OSm, which is smaller than 1. (3) Patent claim 0g1 in which the upper part of the independent protrusion is flat
The water-permeable sheet according to item 1. (4) The sacred wood sheet according to claim 1, wherein the independent protrusions have a truncated conical shape or a semicircular O shape. (8) A water-permeable sheet according to claim 1, wherein the heights of the large number of independent centers are uniform on both sides. (6) The water-permeable sheet according to claim aSS, wherein the through holes are present at the top, side, and bottom of the independent protrusion. (7) The material of the sheet is hard polyvinyl chloride, polyethylene, polyethylene, polystyrene, polycarbonate,
The water-permeable sheet according to claim 1, which is made of polyvinylidene chloride, polyester, or polyester.