JPH01207515A - Plane draining material for civil engineering - Google Patents

Abstract

PURPOSE:To improve the water permeability and external pressure resistance by sticking a water-permeable sheet to a plastic sheet material formed with many projections, recesses and flat sections and having many openings between adjacent portions of them and arranging it in the ground. CONSTITUTION:Portions pinched by slits 14 of a plastic sheet 12 horizontally and vertically arranged with many slits 14 are protruded in turn in opposite directions, front and back, to form many projections, recesses and flat sections. Many openings 15 are formed on boundaries between the adjacent projections, recesses and flat sections as water passing belts, and reinforcing belts are provided at required positions if necessary. A water-permeable sheet 13 is stuck to this plastic sheet 12, it is arranged in the soft ground so that the excess pore water permeates. The water permeation efficiency is thereby improved, the resistance against the external force during and after the burial is increased, and the adhesion between the core material and nonwoven fabric can be strengthened.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is directed to J1! Regarding flat drainage materials for civil engineering used for board improvement, etc., in more detail, they have high drainage capacity, and are also effective against the force applied during pouring and buried g! #; Earth pressure of the board and J1! This invention relates to a flat drainage material for civil engineering that has high resistance to pressure caused by changes in X, etc., and also has a nonwoven fabric that is prone to peeling off the core material during pouring.

(Prior art) Conventionally, as a planar drainage material for civil engineering,
The method described in Publication No. 99 has been proposed.

As shown in Fig. 9, this planar drainage material for civil engineering (5I) consists of a core material (42) made of a plastic sheet with depressions on both sides and a large number of independent protrusions (55) on both sides, and a core material (42) made of a non-woven fabric ( 53). In this planar drainage material for civil engineering (51), a large number of independent protrusions (55) recessed on the front and back sides and the nonwoven fabric (53) form water channels through which water passes in vertical, horizontal, and diagonal directions. This makes it possible to demonstrate high drainage efficiency. However, with this material, water cannot penetrate through the plastic sheet in the thickness direction.

For this reason, the publication describes a plastic sheet that allows water to pass through the plastic sheet in the thickness direction as well, by making a plastic sheet with many through holes (not shown) indented on both sides and having many independent protrusions on both sides. A core material (42) formed by forming a core material (55) is wrapped in a nonwoven fabric (53).

(Problem to be solved by the invention) However, since this planar drainage material for civil engineering is formed by cutting through holes in the core material, the force applied during pouring and the The resistance to pressure caused by soil pressure and ground movement had decreased. In addition, since TT oil holes are also formed at the top of the independent protrusion of the core material where the non-woven fabric 4j is pasted, the adhesive area to which the non-woven fabric is bonded becomes small, and the non-woven fabric or the core material may peel off during casting. It was getting easier.

The invention was developed in view of these problems, and it has a high drainage opening force, a high resistance to the force applied during pouring, the soil pressure in the ground after burial, and the pressure caused by ground fluctuations, etc. The purpose is to provide a planar drainage material for civil engineering in which the nonwoven fabric does not peel off from the core material during pouring.

(Means for Solving the Problems) That is, the invention according to claim 1 of this application provides a planar drainage material for civil engineering in which a water-permeable sheet is bonded to at least one surface of a plastic sheet material, in which the plastic sheet materials are bonded to each other. A planar drainage material for civil engineering, characterized in that it is a water flow belt consisting of convex parts and four parts or a flat part arranged next to each other, and an opening formed at the boundary between these mutually adjacent convex parts and the concave part or the flat part. It is. Further, the invention according to claim 2.3 of this application provides a planar drainage material for civil engineering in which a water-permeable sheet is bonded to at least one surface of a plastic sheet material, in which the plastic sheet materials are arranged in convex portions adjacent to each other. a water passage zone consisting of a convex portion, a concave portion or a flat portion, and an opening formed at the boundary between the convex portion and the concave portion or the flat portion adjacent to each other;
This flat drainage material for civil engineering is also characterized by being sewn from a flat reinforcing band provided on a part of a plastic sheet.

(Function of the Invention) Therefore, in the planar drainage material for civil engineering according to the invention set forth in claim 1 of this application, when the water-permeable sheet is bonded to the plastic sheet material, the plastic sheet materials are arranged next to each other. A drainage structure is formed inside the water flow belt and between the water flow belt and the permeable sheet by the water flow belt consisting of the raised parts, recessed parts, or flat parts, and openings formed at the boundaries of these raised parts and the four parts or the flat parts. Excess pore water in the soft ground is discharged to the ground.

In addition, the flat drainage material for civil engineering according to the invention set forth in claim 2.3 of this application has a drainage structure similar to that of the flat drainage material for civil engineering according to the invention set forth in claim 1, and is suitable for use on soft ground. Excess pore water inside is discharged to the ground, and when pressure is applied to the flat drainage material for civil engineering during pouring or burial, flat reinforcement provided on a part of the plastic sheet The belt reinforces the water passage belt to prevent deformation of the planar drainage material for civil engineering due to pressure.

(Example) The planar drainage material for civil engineering of the present invention will be described in detail below according to the example shown in the drawings.

Fig. 1 is a front view showing the planar drainage material for civil engineering according to the invention as claimed in claim 1 of this application, Fig. 2 is an enlarged sectional view taken along line AB of Fig. FIG. 4 is an enlarged sectional view taken along the CD line of FIG.

As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, the planar drainage material for civil engineering (1
1) is made by pasting a water-permeable sheet (13) on at least one surface of a plastic sheet material (12).

As shown in FIGS. 1, 2, 3, and 4, the plastic sheet material (12) is made of, for example, high-density polyethylene, hard polyvinyl chloride, polystyrene, polypropylene, polyvinylidene chloride, or vinyl. This is a water-permeable belt made of a hard, aged plastic sheet made of iron, polyester, etc. that has excellent water resistance.

This plastic sheet material (12) is, for example, as shown in FIG. It is formed by pushing out the part sandwiched between the two slits (14) in the front direction and pushing out the part sandwiched by the other slit (14) in the back direction.

That is, the plastic sheet material (12) is formed by extruding the portion between the other slits (14) provided on the plastic sheet toward the surface in a waveform, triangular, trapezoidal, semicircular, etc. shape to form a convex portion (+2a). , and on the other hand, the part sandwiched by the other slit (14) adjacent to this convex part (12a) is pushed out in the back direction into a waveform, triangular, trapezoidal, semicircular, etc. shape to form a four-part opening 2b). By doing so, the convex portions (12a) and the four portions (12b) are arranged adjacent to each other on the plastic sheet L.

At the same time, when pushing out the portion sandwiched between mutually adjacent slits C14 in the front direction or back direction, the slits C14 are pushed and pulled in the front direction and the back direction to open the opening (
15) is formed. For this reason, the convex portion (12a
) and the fourth part (12b), the convex part (12a) and the concave part (12b)
) A void is formed in the plastic sheet material (12) by an opening (15) formed at the boundary with the plastic sheet material (12), through which excess pore water in the soft ground passes. Furthermore, extremely high strength can be obtained compared to the conventional example in which an opening is formed by cutting out a part of a plastic sheet. Furthermore, the plastic sheet material (I2) is easily bent because a plurality of slides (14) are formed on the plastic sheet. The size and number of the slits (14) are determined according to the softness of the civil engineering planar drainage material (11). ! The decision will be made taking into account the board, burial period, etc. In other words, if slit)-(14) is made long and large, the convex fl! formed thereby! (12a) and recess (12
b) and the opening (15) formed at the boundary between these convex parts (+2a) and the fourth part (12b) are also larger and the porosity increases, which further improves water permeability, but the plastic sheet material (12) It becomes bulky and thick and its strength decreases.

On the other hand, when the slit (14) is made short and small, the convex part (12a) and the four parts (12b) formed thereby, and the opening (15) formed at the boundary between the convex part (12a) and the concave part (12b). becomes smaller, and the plastic sheet material (12) becomes less bulky and thinner, improving its strength, but its porosity decreases and its water permeability decreases.

In addition, the plastic sheet material ([2) may be a water-permeable belt consisting of a convex part, a flat part, and an opening formed at the boundary between the convex part and the flat part; in this case, the convex part and the concave part Although the capacity of the drainage structure of the resulting planar drainage material for civil engineering is reduced compared to that of a drainage zone having a water flow zone, a thinner drainage material can be created.

In addition, it is desirable that the thickness of the plastic sheet used as the material of the plastic sheet material (12) is 0.3 to 2.0 mm; if it is thinner than this, the pressure resistance required for a flat drainage material for civil engineering cannot be obtained. If it is thicker than this, the thickness of the drainage structure will be reduced and the thickness of the drainage material will tend to increase, resulting in high cost.

A water-permeable sheet (13) is bonded to at least one surface of the plastic sheet material (12) described above.

The water-permeable sheet (13) is shown in Fig. 1, Fig. 2, Fig. 3, and
As shown in FIG. 4, it is a sheet material that has water permeability and does not collapse or deform even if placed in the ground for a long period of time. The water-permeable sheet (13) may be, for example, a heat-adhesive sheet made of nylon, polyethylene, polyamide, polypropylene, polyvinylidene chloride, or the like.
Non-woven fabrics using fibers are preferred. This water-permeable sheet (13
) on the convex portion (12a) of the plastic sheet material (12).
) and the recess (12b) to form a water-permeable sheet ([3
) and the plastic sheet material (12) are bonded together.

In this example, a fabric weight of 90 g/m'' was obtained by web needling consisting of a 1 m composite of polypropylene and polyethylene with a thickness of 3 d and a fiber length of 51 mm. A felt-like non-woven fabric with a thickness of 1.8 layers is used, and while this felt-like non-woven fabric is attached to the plastic sheet material (I2), it is placed between stainless steel rolls.
The plastic sheet material (I2
) and the convex portions (12a) and concave portions (12b) of the water-permeable sheet (
13) were both softened and bonded together, and at the same time, the fibers on both surfaces of the non-silent fabric were also softened to make the m distance denser by bonding. Therefore, the convex part (12a) and the concave part (12b) of the plastic sheet material (+2) and the water-permeable seam) -(+
3) can be laminated continuously and quickly, and at the same time, the nonwoven fabric can be made denser.

In addition, a water-permeable sheet (
13), a water permeable sheet or a plastic sheet such as polyethylene or polypropylene is pasted on the other side.

Next, the planar drainage material for civil engineering according to the invention recited in claim 2.3 of this application will be described in detail with reference to the drawings.

FIG. 5 is a front view showing the flat drainage material for civil engineering according to the invention described in claim 2.3 of this application, FIG. 6 is an enlarged sectional view taken along line EF in FIG. 5, and FIG. I is an enlarged sectional view taken along line GH in FIG. 5, and FIG. 8 is claim 2.3 of this application.
It is an enlarged side view showing the planar drainage material for civil engineering of the invention described in .

As shown in FIGS. 5, 613, 7, and 8,
The planar drainage material (21) for civil engineering according to the invention described in claim 2.3 of this application is provided with a reinforcing band (28) on a plastic sheet material (22).
It has the same structure as the planar drainage material for civil engineering (21) of the invention described in .

The plastic sheet material (22) has a convex part (22a) and a fourth part (22b) provided in a part of the plastic sheet, and an opening (25) formed at the boundary between the convex part (22a) and the concave part (22b). It consists of a water-conducting zone (29) through which excess pore water in the soft ground passes, and a reinforcing zone (28) also provided on a part of the plastic sheet.

The reinforcing band (28) is a flat plate part of a plastic sheet,
A plurality of slits (24) are formed to reinforce the water passage zone (29), which is easily visible. Reinforcement band (28
) is preferably provided along the length direction of the civil engineering flat drainage material (21), that is, along the direction in which the civil engineering flat drainage material (21) is placed. It can be supported in any direction. As shown in No. 61i, when bonding the water-permeable sheet (23) to the plastic sheet material (22), the reinforcing bands (28) at both ends of the water-permeable sheet (23) or the plastic sheet material (22) are fully bonded. The entire plastic sheet material (22) is then covered with the water-permeable sheet (23). Therefore, J! ! When placed in snow, the water-permeable sheet (23) does not peel off, and the mechanical strength of the planar drainage material (21) for civil engineering can be further increased. In addition, in this example, the reinforcing band (28)
are provided at both ends of the water flow belt (29), or may be provided at multiple locations such as both ends and the center of the water flow belt (29), and in some cases may be provided in the width direction of the drainage material. .

In addition, the planar drainage material for civil engineering (11) of the invention described in claim 1 of this application or the planar drainage material for civil engineering (21) of the invention described in claim 2.3 of this application are both Although the example is shown in which it is buried vertically in soft ground, it is not limited to this, and it may be buried horizontally.

(Effects of the Invention) As detailed above, in the planar drainage material for civil engineering according to the invention set forth in claim 1 of this application, the convex portions and concave portions or flat portions of the plastic sheet material, and the convex portions and concave portions of the plastic sheet material. Or, since the drainage structure is formed by a water permeable belt having an opening formed at the boundary with a flat area, excess pore water in the soft ground can pass through the entire water permeable belt of the plastic sheet material. Excess pore water can be discharged to the ground with extremely high efficiency.

In addition, in the civil engineering surface drainage material of the invention described in claim 1 of this application, the force applied during pouring and the J1! ! It has high resistance to pressure caused by the slope of the board and changes in the ground. Furthermore, compared to conventional planar drainage materials for civil engineering, the bonding area between the core material and the non-woven fabric is larger, so the non-woven fabric or the core material may peel off during pouring.

In addition, since the plastic sheet material is easily bent, it can be stored or transported rolled up.

In addition, in the planar drainage material for civil engineering according to claim 11 of claim 2.3 of this application, the convex portion and the four portions or the flat portion of the plastic sheet material, and the boundary between the convex portion and the four portions or the flat portion. Since the drainage structure is formed by a water passage sit with an opening formed in the plastic sheet material, the entire water permeable zone of the plastic sheet material is soft. ! Excess pore water in the board can be passed through, and excess pore water can be discharged to the ground with extremely high efficiency.

In addition, the planar drainage material for civil engineering according to the invention described in claim 2.3 of this application has high resistance to the force applied during pouring, the soil pressure of the ground after burial, the pressure generated by ground fluctuations, etc. . Furthermore, compared to the conventional 1: planar drainage material for wood, the adhesion area between the core material and the non-woven fabric is larger, so the non-woven fabric or the core material comes undone during pouring.

Further, in the planar drainage material for civil engineering according to the invention set forth in claim 2.3 of this application, a flat reinforcing band provided on a part of the plastic sheet reinforces the water passage band. Therefore, it is possible to prevent the civil engineering flat drainage material from deforming due to the pressure applied when the civil engineering flat drainage material is placed or buried.

Further, in the flat drainage material for civil engineering according to the invention described in claim 2.3 of this application, since the plastic sheet material is easily bent, it can be stored or transported rolled up.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the planar drainage material for civil engineering according to the invention as claimed in claim 1 of this application, Fig. 2 is an enlarged sectional view taken along line AB in Fig. 1, and Fig. 3 is the CD of 1UA. FIG. 4 is an enlarged sectional view taken along a line, FIG. 4 is an enlarged perspective view showing the planar drainage material for civil engineering according to the invention claimed in claim 1 of this application, and FIG. 61'A is an enlarged sectional view taken along the EF line in FIG. 5, FIG. 7 is an enlarged sectional view taken along the GH line in FIG. 5, and FIG. FIG. 9 is an enlarged perspective view showing a planar drainage material for civil engineering according to the invention described in claim 2.3 of this application, and FIG. 9 is a perspective view showing a conventional planar drainage material for civil engineering. Code theory 1. IJ 12, 22--Plastic sheet material, 13, 23
...Water-permeable sheet, 15. 25... opening, 28...
・Reinforcement belt, 29...Water belt. Patent applicant Nippon Vilene Co., Ltd. 111111
1111 End No. 14 ■ 1 Cow\13 1 to 1 □, □ D, J 21M Figure 3 Ward Field, 1U Tsure

Claims (3)

[Claims] (1) In a planar drainage material for civil engineering in which a water-permeable sheet is bonded to at least one surface of a plastic sheet material, the plastic sheet material has convex portions and concave portions or flat portions arranged adjacent to each other, and convex portions adjacent to each other. 1. A planar drainage material for civil engineering, characterized in that it is a water passage zone consisting of an opening formed at the boundary of a concave part or a flat part. (2) In a planar drainage material for civil engineering in which a water-permeable sheet is bonded to at least one surface of a plastic sheet material, the plastic sheet material has convex portions and concave portions or flat portions arranged adjacent to each other, and convex portions adjacent to each other. 1. A planar drainage material for civil engineering, characterized in that it consists of a water-permeable belt consisting of an opening formed at the boundary of a recess or a flat part, and a reinforcing belt in the form of a flat plate, which is also provided in a part of a plastic sheet. (3) The planar drainage material for civil engineering according to claim 2, wherein the plastic sheet material has reinforcing bands at both ends of the water-permeable band.