JPH0248556Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is arranged between, for example, a tunnel's primary lining concrete and secondary lining concrete,
This invention relates to drainage materials used for guiding and draining spring water from the primary lining concrete side.

Conventionally, a waterproof sheet was placed between the primary concrete lining and the secondary concrete lining of a tunnel.
Measures are being taken to prevent spring water from the primary lining concrete side from leaking into the secondary lining concrete side, but in this case, the spring water from the primary lining concrete side is guided to the drain and discharged. There is a need. For this reason, in the past, a large number of cuts were formed along the width of a plastic sheet to create a waterproof sheet that could guide and discharge spring water to a discharge port.
It is known that this plastic sheet is stretched in the length direction to form holes in the cut portions, a water permeable net is provided on one side of the sheet, and an impermeable sheet is provided on the ground. ing. In this tarpaulin, spring water flows through a permeable net into a plastic sheet with holes and flows down the plastic sheet, but this tarpaulin has the problem of lack of flexibility, so It is not possible to install it in a tight fit, making it difficult to construct, and it is not sufficient to drain water rapidly due to heavy rain, etc., and it is likely to become clogged with earth and sand. There is also the problem of

The present invention was developed in view of the above circumstances, and since it has flexibility, it can be securely installed on concrete walls with curved surfaces, and therefore has good workability and is suitable for water flow. It has good properties, can quickly drain rapidly flowing water, and is less likely to be clogged with dirt, etc. Therefore, it can be placed between the primary lining concrete and secondary lining concrete of the tunnel. The purpose of the present invention is to provide a drainage material suitable for civil engineering drainage work, such as for use in guiding and draining spring water from the primary lining concrete side.

That is, in order to achieve the above-mentioned object, the present invention provides a spiral body on a water-impermeable base sheet and covers this spiral body with a water-permeable sheet to form a passage through the spiral body.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, 1 is a water-impermeable base sheet, and on this base sheet 1 are metal wires, plastic-covered metal wires,
Multiple pieces (two pieces in the drawing) formed by spirally winding a linear object such as a plastic wire
The bendable spiral bodies 2, 2 are arranged side by side with a predetermined distance from each other. And these spiral bodies 2, 2
is covered with a water-permeable sheet 3 so as to form a cylindrical portion on the base sheet 1, and the insides of the spiral bodies 2, 2 are formed as water passages 4, 4.
Note that the base sheet 1 and the water-permeable sheet 3 are sewn to each other at predetermined locations on both sides of the spiral bodies 2, 2, thereby fixing the spiral bodies 2, 2 between both sheets 1, 3. In addition, both sheets 1,
3 are fixed to each other. In this case, both sheets 1 and 3 can also be fixed together by means such as heat fusion.

Here, the base sheet 1 is a polyethylene sheet,
It is formed of a water-impermeable material such as a polypropylene sheet or an ethylene-vinyl acetate copolymer sheet, and the water-permeable sheet 3 may be a water-impermeable synthetic resin sheet with many small holes, a woven fabric, or a knitted fabric. , a nonwoven fabric sheet, an open-cell synthetic resin foam sheet, a synthetic resin net, or other water-permeable material. In addition,
The base sheet 1 is not limited to a single layer structure as shown in FIG. 2, but can also have a multilayer structure (two layers in FIG. 3) in which a plurality of sheets are laminated as shown in FIG. In this case, in FIG. 3, the lower layer 1a may be water impermeable, the upper layer 1b may be water permeable, and the spiral bodies 2, 2 may be disposed on the upper layer 1b. For example, the lower layer 1a may be formed from cloth, a laminate cloth (a woven fabric made from stretched and slit yarn of high-density polyethylene, and polyethylene is laminated on both sides), and the upper layer 1b may be formed from a non-woven fabric. This increases the overall strength and water retention. Further, the water-permeable sheet 3 can also have a single-layer or multi-layer structure. Here, the water permeable sheet 3 can be disposed on the entire surface of the base sheet 1 as shown in FIG. 2, but as shown in FIG. You may also arrange it.
Further, the manner in which the spiral bodies of the water-permeable sheet 3 are arranged is not limited to those shown in FIGS. 2 to 4, but may be arranged as shown in FIG. 5.

The size of the spiral bodies 2, 2 is not necessarily limited, but the diameter is 10 to 50 mm, the pitch is 1 to 20 mm, and the length is 1 to 30 mm.
It can be wound so that it becomes m.

The above-mentioned drainage material 6 can be placed in the primary lining concrete 7, for example, as shown in FIG.

That is, when using the drainage material 6, the water-permeable sheet 3 is placed facing the side where water flows out, and the waterproof sheet 8 is placed on the base sheet 1 side of the drainage material 6. The required locations of the material 6 and the waterproof sheet 8 are fixed to the primary lining concrete 7 with bolts or the like. As a result, even if water leaks from the concrete 7, this water will flow through the gap between the spiral bodies 2, 2 between the water permeable sheet 3 and the base sheet 1 through the water permeable sheet 3 and into the interior of the spiral bodies 2, 2. The water flows into the water channels 4, 4 and flows down through the water channels 4, 4, so that water is prevented from leaking to the outside of the waterproof sheet 8.

Although not shown, a secondary lining concrete is placed on the waterproof sheet 8 side.

In this case, the above-mentioned drainage material 6 is the base sheet 1
A spiral body 2, 2 formed by spirally winding a linear material such as a metal wire is disposed between the metal wire and the water-permeable sheet 3, and these spiral bodies 2, 2 are bendable. Therefore, it is possible to securely fit and install the device at the installation location. That is, even if the surface on which the drainage material 6 is to be disposed has a curved surface, the spiral bodies 2, 2 are easily bent in the direction perpendicular to the water-permeable sheet 3, so that they can be disposed to reliably follow the surface on which the drainage material 6 is disposed. be able to. Moreover, since the spiral bodies 2, 2 can be bent to some extent in the horizontal direction with respect to the water-permeable sheet 3, suitability to the location where they are disposed is good in this respect as well.

Furthermore, this drainage material 6 has good water permeability and can allow a large amount of water to flow through it without any hindrance. Therefore, even when a large amount of water flows rapidly due to concentrated rain, it can be quickly drained. At the same time, clogging due to earth and sand is less likely to occur.

Moreover, in this case, if the upper layer 1b of the base sheet 1 of the drainage material 6 is formed of a water-permeable material such as a nonwoven fabric,
This water-permeable base sheet 1 also retains water and flows through its interior, resulting in higher water retention.

Although a plurality of spiral bodies are provided in the above embodiment, the number of spiral bodies is not limited, and one spiral body may be provided on the base sheet. Further, the spiral body may be disposed over the entire length of the base sheet, or may be disposed only in a necessary length portion. Furthermore, since one side of the present invention is made of a water-impermeable base sheet, it can also be used as a waterproof sheet, and the usage of the present drainage material is not limited to the above, but can be used in various applications. is possible, and various changes may be made to other configurations without departing from the gist of the present invention.

As explained above, in the present invention, a spiral body of metal wire is disposed on a water-impermeable base sheet, and this spiral body is covered with a water-permeable sheet, and the spiral body is used as a passageway, so that the concrete wall surface It can be installed securely in installation locations such as, has good workability, has good water permeability, can quickly drain rapidly flowing water, and does not get clogged by earth and sand, etc. It's difficult.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention, FIG. 2 is a partially cutaway sectional view of the same example, and FIGS. 3, 4, and 5 are Partially omitted sectional views showing other embodiments of the present invention, No. 6
The figure is a sectional view showing an example of how the embodiment of FIG. 1 is used. 1... Base sheet, 2... Spiral body, 3... Water permeable sheet, 4... Water passage.

Claims (1)

[Scope of utility model registration request] A drainage material characterized in that a spiral body having flexibility is disposed on a water-impermeable base sheet, and the spiral body is covered with a water-permeable sheet to form a passageway within the spiral body.