JPH04131418A - Drainage member in civil engineering work and drainage works in ground - Google Patents

Abstract

PURPOSE:To drain the water in the ground by making two sheets of a pressure- resistant sheet with protrusions at one side of flexible flat part having water permeable holes, and engaging mutual protrusions with each other to laminate a layer. CONSTITUTION:A drainage member 1a for civil works is formed by sticking a synthetic resin pressure-resistant sheet 2a having bristle protrusions 6a on one side of a flat flexible part 5a provided with water-permeable holes 4a, to a water-permeable sheet member 3a on the other side of the sheet 2a. Next, both protrusions 6a of the drainage members 1a are engaged with each other to laminate two sheets of drainage members 1a, 1b. And this laminated member is buried in the ground. In this way, it can be wound to be efficient for transportation and it can be prevented from deforming due to the ground pressure not to be hard to drain.

Description

[Detailed description of the invention]

[00013

[Industrial Application Field] The present invention provides a civil engineering drainage material for draining soil water during civil engineering work such as land reclamation work, and a method for draining soil water using this civil engineering drainage material. This relates to soil water drainage construction methods. [0002] [0002] Conventionally, nonwoven fabrics having a large porosity and being relatively bulky have been used as drainage materials for civil engineering. When this nonwoven fabric is buried in the soil, water in the soil is drained to the outside through gaps between the constituent fibers in the nonwoven fabric. However, in the case of this nonwoven fabric, when the pressure in the soil (earth pressure) increases, the gaps between the constituent fibers are crushed, and the water in the soil stops flowing, making it impossible to perform good drainage. [0003] For this reason, a drainage material for civil engineering is also used in which a corrugated sheet made of synthetic resin is used and a sheet-like water-permeable material is bonded to both sides of the corrugated sheet. In the case of this drainage material for civil engineering, underground water flows through the valleys of the corrugated sheets and is drained to the outside. In order to prevent this drainage material for civil engineering from being crushed by earth pressure, it is necessary to use a rigid corrugated sheet. However, if a rigid corrugated sheet is used, the civil engineering drainage material cannot be rolled up, and when the civil engineering drainage material is transported to a civil engineering site, it cannot be handled as a roll. If it could not be handled as a scroll, it would be bulky and could not be transported efficiently. On the other hand, if a corrugated plate is used that is flexible enough to be handled as a roll, the corrugated plate will be crushed by earth pressure, resulting in the disadvantage that soil water cannot be properly drained. [0004]

[Problem to be solved by the invention]

Therefore, the present invention uses a pressure-resistant sheet with a special shape and properties in place of the corrugated sheet, and thereby provides a soil water drainage material that can be handled as a roll and will not be crushed by the soil. . [0005]

[Means to solve the problem]

That is, the present invention provides a pressure-resistant sheet having a flexible flat portion having water holes and a large number of rigid protrusions on one side, and a sheet-like sheet bonded to the other side of the flexible flat portion of the pressure-resistant sheet. The pressure sheet is made of a water-permeable material, and the distance between the adjacent protrusions is wide enough to fit the protrusions of another pressure-resistant sheet, and in the fitted state, water can pass in the surface direction of the pressure-resistant sheet. The present invention relates to a drainage material for civil engineering, which is characterized by certain features, and a construction method for draining underground water using this drainage material for civil engineering. [0006]

【Example】

The present invention will be explained below based on the drawings. [0007] In FIG. 1, (1a) is a drainage material for civil engineering according to an example of the present invention. This drainage material for civil engineering (1a) is a pressure-resistant sheet) (2
a) and the sheet-like water-permeable material (3) bonded to the opposite surface of the pressure-resistant sheet (2a) to the surface on which the protrusion (6a) is provided.
a). [0008] Pressure-resistant sea) (2a) includes a flexible flat part (5a) having a water passage hole (4a), and a large number of protrusions (6a) provided on one side of this flexible flat part (5a). It depends on this. The flexible flat portion (5a) has a water passage hole (4a) for conducting soil water to the surface of the protrusion (6a). For example, when the flexible flat part (5a) is made of foam, the open cells become the water passage holes (4a), and when the flexible flat part (5a) is made of a foam, the water passage holes (4a) are formed by the gaps between the fibers. This becomes a hole (4a). Furthermore, when the flexible flat part (5a) is made of synthetic resin, a perforation is provided, and this perforation becomes a water passage hole (4a). [0009] Furthermore, the protrusion (6a) is rigid enough to withstand a load of 3 to 5 kg/cm2, and its shape may be a cylinder, a cone, a triangular pyramid, a quadrangular pyramid, or the like. In particular, in order to increase pressure resistance, it is preferable to adopt a conical shape whose side surfaces gradually widen from the tip toward the bottom. [00103] Furthermore, the shape of the projection (6a) may be a drum-shaped bridge as shown in FIG. 5 or 6. Such a protrusion (6a) may be formed by pressing a flat synthetic resin sheet using a convex portion whose surface is in the form of a strip. In this way, the part pressed by the convex part is cut in the longitudinal direction and not in the width direction, and the part pressed by the convex part is not cut in the width direction.
This results in a). Pressure-resistant seams shown in Figure 5 or Figure 6)
In the case of (2a), the water hole (4a) is connected to the protrusion (6a)
It is formed by the back surface, that is, the part that was pressed and cut. Moreover, if the drum-shaped protrusions (6a) are arranged in a staggered manner, the drum-shaped bridge-shaped protrusions (6b) of the other pressure-resistant seat (2a) can be tightly fitted. Of course, it goes without saying that the Taikobashi-shaped protrusions (6a) may be arranged in other ways than in a staggered manner, for example, in alternate rows. The portion (6a) may be made of the same material or may be made of different materials, and the protrusion (6a) may be formed by bonding or welding on one side of the flexible flat portion (5a). may be fixed. If they are made of the same material, a synthetic resin is used as the material, and the flexible flat part (5a) and the protrusion part (5a) are made by extrusion molding or other means.
6a) is preferably provided. This is because the pressure-resistant sheet (2a) can be manufactured easily. [0012] The distance between adjacent projections (6a) is the same as that of other pressure-resistant seams)
It is necessary to have a width that allows the protrusion (6b) of (2b) to fit therein. However, it is also necessary that water can be passed in the surface direction of the pressure sheets (2a) and (2b) in the fitted state. Pressure-resistant seams shown in Figures 1 and 2) (2
In case a), since the protrusion (6a) has a conical shape, the protrusions (6a) and (6b) do not come into complete contact with each other, and water does not flow between the protrusions (6a) and (6b). becomes possible. In addition, the pressure-resistant seams shown in Figures 5 and 6)
In the case of (2a), even if the protrusions (6a) and (6b) are in complete contact with each other, on the back surface of the protrusions (6a) and (6b),
Since there is a region through which water can pass in the surface direction of the pressure sheets (2a) and (2b), there is no possibility that water will not be able to pass through. [0013] On the other side of the pressure-resistant sheet (2a), a sheet-like water-permeable material (3
a) are attached with adhesive or the like. Sheet-like water-permeable material (
As 3a), any material can be used as long as it can permeate underground water and guide it to the water passage hole (4a). Specifically, it is preferable to use knitted fabrics, nonwoven fabrics, perforated films, paper, etc. [0014] The method of using this drainage material for civil engineering is as follows. That is, first, two civil engineering drainage materials (1a) and (1b) are prepared. Then, the two civil engineering sheets are placed so that the protruding parts (6a) and (6b) of the pressure-resistant sheets (2a) and (2b) face each other, and the protruding parts (6a) and (6b) fit together. The drainage materials (1a) and (1b) are layered. A cross-sectional view of an example of this stacked state is shown in FIG. 3, and there is a gap between the fitted protrusions (6a) and (6b) through which underground water can pass. Then, with these two civil engineering drainage materials (1a) and (1b) stacked,
It can be buried in the ground. [0015] Further, in the present invention, the usage method shown in FIG. 4 can also be adopted. That is, civil engineering drainage materials (1a), (1
b) by shifting the width of the projections (6a) and (6b), and fitting the projections (6a) and (6b), resulting in an extra projection (6a),
(6b) and other waterproof sheets (2b) and (2a) respectively.
The protrusions (6b) and (6a) of the two are fitted together. In this way, a wide laminate can be obtained, and when this is buried in the soil, the water in the soil can be drained using the wide width. Adhesive tape (7) is pasted on the seams of the laminate that occur in this case, so that sand and water in the soil can be removed from the protrusions (6).
a), (6b) or between them, and the pressure-resistant sheet (2
It is preferable to prevent soil water from flowing in the plane directions of a) and (2b). [0016] When the above soil water drainage method is adopted, soil water is drained from the sheet-like water permeable material (3a) of the civil engineering drainage materials (1a) and (1b).
), (3b), and further pressure sheets (2a), (2
The protrusions (6a), (6) pass through the water holes (4a), (4b) provided in the flexible flat parts (5a), (5b) of
b) into or between them. Then, the planar direction of the civil engineering drainage materials (1a) and (1b), that is, the pressure-resistant sea)
The underground water flows in the plane direction of (2a) and (2b), and is drained to the outside from the ends of the civil engineering drainage materials (1a) and (1b). [0017]

[Action and effect of the invention]

As described above, the drainage material for civil engineering according to the present invention has a flexible flat part and the protrusions are provided at regular intervals, so that sufficient flexibility is exhibited between the protrusions. do. Therefore, this drainage material for civil engineering can be handled as a roll and transported as a roll to a civil engineering work site. Therefore, during transportation, it is not bulky, easy to handle, and has the effect of efficient transportation. Use by stacking two sheets. In this way, the protrusion is rigid and difficult to be crushed by earth pressure, and a sufficient water passageway formed on the back surface of the protrusion or between the protrusion parts can be ensured. Therefore, if this drainage material for civil engineering is used, it is possible to prevent soil water from being crushed by earth pressure, which makes it difficult for soil water to flow, resulting in poor drainage.

[Brief explanation of drawings]

[Figure 1] FIG. 1 is a perspective view of a drainage material for civil engineering according to an example of the present invention.

[Figure 2] FIG. 2 is a cross-sectional view of the drainage material for civil engineering shown in FIG. 1. FIG.

FIG. 3 is a cross-sectional view showing an example of how to use the drainage material for civil engineering according to the present invention.

FIG. 4 is a cross-sectional view showing another example of how to use the drainage material for civil engineering according to the present invention.

[Figure 5] FIG. 3 is a perspective view of a drainage material for civil engineering according to another example of the present invention.

[Figure 6] FIG. 6 is a longitudinal cross-sectional view of the drainage material for civil engineering shown in FIG. 5;

[Explanation of symbols]

1a Drainage material for civil engineering 1b Drainage material for civil engineering 2a Pressure resistant sheet 2b Pressure resistant sheet 3a Sheet-like water-permeable material 3b Sheet-like water-permeable material 4a Water hole 4b Water hole 5a Flexible flat part 5b Flexible flat part 6a Protrusion 6b Protrusion

[Document base]

[Figure 1]

[Figure 2] drawing

[Figure 3]

[Figure 4] [Figure 51 a

Claims (5)

[Claims] [Claim 1] A pressure-resistant sheet having a flexible flat part with water passage holes and a large number of rigid protrusions on one side, and a water-permeable sheet laminated to the other side of the flexible flat part of the pressure-resistant sheet. The distance between the adjacent protrusions is wide enough to fit the protrusions of another pressure-resistant sheet, and water can pass in the surface direction of the pressure-resistant sheet in the fitted state. A drainage material for civil engineering that is characterized by: 2. The drainage material for civil engineering according to claim 1, wherein the pressure sheet is made of synthetic resin. 3. The drainage material for civil engineering according to claim 1, wherein the flexible flat portion is perforated to form a water passage hole, and the protrusion has a conical shape. 4. The civil engineering drainage material according to claim 1, wherein the protrusion has a drum bridge shape, and a water passage hole is provided on the back surface of the protrusion. 5. Two sheets of the drainage material for civil engineering according to claim 1 are prepared, and the protrusions of the pressure-resistant sheets are fitted so as to face each other to obtain a laminate, and then the laminate is buried in the soil. This soil water drainage method is characterized by: