JP2000080896A - Drain material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent concrete from entering by arranging fiber structures having water repellent performance in both sides of a three-dimensional structure formed by twining bristle yarn between an impermeable sheet and a permeable sheet into a Roman figure III shape. SOLUTION: A belt-shaped impermeable sheet 18 and a permeable sheet 32 are faced to each other and a long crimped bristle yarn is twined between the both sheets 18, 32 so as to form a three-dimensional structure 14. Fiber structures 33, 33 having water repellent performance are arranged into a Roman figure III shape with the three-dimensional structure 14 set in the center so that the three-layer structured or a sandwich structured drain material 31 is constituted. Among the fiber structures 33 are a nonwoven fabric composed of a fiber having water repellent performance such as polyolefine adding no oil, tow, and felt. This constitution can prevent concrete from entering into the three-dimensional structure 14, when the concrete is placed between a shotcrete surface and a form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage material buried on the back of a tunnel lining to release spring water.

[0002]

2. Description of the Related Art Leakage and spring water in a tunnel significantly impairs the durability of the tunnel and maintains and maintains the equipment in the tunnel.
Careful design and construction are required for waterproofing because of the increase in maintenance costs. Conventionally, in order to escape leakage and spring water,
As shown in FIG. 4, about 4 to 5 m
The drainage material 12 for vertical drainage is buried at intervals of the drainage, and the drainage material 13 for vertical drainage connecting the drainage materials 12 to each other.
It is being buried. These drainage materials 12,
Reference numeral 13 denotes, for example, a three-dimensional structure manufactured by heat-setting a crimped bristle thread made of a synthetic resin.
Part of the groundwater that has flowed out into the tunnel 13 is discharged out of the system through the cross drainage pipe 15 provided in the tunnel and the first center drain 16 provided in the tunnel, and the remaining groundwater is discharged outside the tunnel. The air is discharged out of the system through the provided second center drain 17.

When a drainage material is buried on the back side of a tunnel lining, as shown in FIG. 5, a so-called one-permeation type drainage material 19 in which a waterproof sheet 18 is adhered to one side of a three-dimensional structure 14 is blown. After pressing against the concrete surface 20, an iron or plastic holding plate 21 is overlaid on the water-blocking sheet 18, and the holding plate 21 and the water-blocking sheet 18 are blown with nails 22 and fixed to the concrete surface 20. Since the holding plate 21 is rigid, the water-impervious sheet 18 is sprayed over the entire length of the concrete surface 20.
Difficult to adhere to.

Accordingly, when concrete (not shown) is poured between the sprayed concrete surface 20 and the formwork 23, the concrete wraps around from the back surface of the water-impermeable sheet 10 as shown by the arrow A, and becomes three-dimensional. It penetrates into the structure 14. In this case, since the voids of the three-dimensional structure 14 are filled with concrete, there is a problem that the three-dimensional structure 14 is no longer useful as a drainage material.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a method in which concrete is poured between a sprayed concrete surface and a formwork. Another object of the present invention is to provide a drainage material capable of preventing concrete from entering a three-dimensional structure.

[0006]

According to the present invention, there is provided a three-dimensional structure comprising a water-impervious sheet and a water-permeable sheet facing each other, a long crimped bristle thread interposed between the sheets, and water repellency on both sides thereof. The present invention relates to a drainage material characterized by having a fiber structure having a river shape. It is preferable that the three-dimensional structure has a polygonal or circular cross section. The water-repellent fiber structure is preferably made of a polyolefin fiber to which no oil agent is applied. Further, it is preferable that the fibrous structure is made of ordinary water-repellent fibers other than polyolefin fibers.

As described above, a three-dimensional structure in which a water-impervious sheet and a water-permeable sheet face each other, a long crimped bristle thread is sandwiched between the two sheets, and a fibrous structure having water repellency on both sides of the three-dimensional structure. When the drainage material is fixed to the concrete surface by spraying a water-impervious sheet with nails or the like, applying a drainage material to the water-impervious sheet part where the fiber structure is attached, The presence of the fibrous structure eliminates a gap between the impermeable sheet and the sprayed concrete surface, while the fibrous structure has water repellency, so that the intrusion of concrete can be prevented by the fibrous structure. Further, in the present invention, a three-dimensional structure and a fibrous structure are sandwiched between the water-permeable sheet and the water-permeable sheet to form a sandwich structure. As described above, by attaching the three-dimensional structure and the fibrous structure to each other by sandwiching the three-dimensional structure and the fibrous structure with the water-permeable sheet and the water-permeable sheet, the drainage material can be easily handled in addition to the above-described operation.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a drainage body according to the present invention, and FIG. 2 is a front view including a partial cross-section of the drainage body according to the present invention. The drainage body 31 has a strip-shaped impermeable sheet 18 and a water-permeable sheet 32. A three-dimensional structure 14 entangled with a long crimped bristle yarn, and a fibrous structure 33 having water repellency.
Are arranged in a river shape with the three-dimensional structure 14 in the middle 3
It has a layer structure or a sandwich structure.

The three-dimensional structure 14 is adhered to the back surface of the waterproof sheet 18 with an adhesive, and the fibrous structure 33 is sewn between the waterproof sheet 18 and the transparent sheet 32.
The water-blocking sheet 18 may be any as long as it has water-blocking properties, has strength and elongation that does not break when casting concrete, and has good durability and workability. Usually, ethylene / vinyl acetate (EV
A) or polyvinyl chloride (PVC) sheets are used. As the water-permeable sheet 32, for example, a water-permeable sheet such as a nonwoven fabric or a mesh made of polyester or polypropylene is preferably used.

The three-dimensional structure 14 is made of, for example, polyester bristles having a fineness of 4,900 denier and a melting point of 1%.
The coated bristle yarn having a fineness of 10,000 denier obtained by surface-coating a polybutadiene-based resin at 40 to 160 ° C. is pressed into a pressing box with a pressing roller to obtain a crimped bristle yarn having a density of 0.05 g. / Cm ² to form an intermediate of a three-dimensional structure having a porous structure such as luffa, which is then filled at a temperature at which only the coating resin is melted (eg, 180 ° C.) for several minutes (eg, Heated for 2 minutes) and heat-fixed each contact of crimped bristle yarn is preferably used. In addition, other synthetic resins such as polyamides such as nylon 6 and nylon 6,6 and polyolefins such as polypropylene and polyethylene can be used as the material of the bristle yarn, and the material of the resin applied to the surface is not limited to polybutadiene. In addition, any fineness of the crimped bristle yarn of about 2,500 to 10,000 denier can be used (the elastic strength is 5,000).
-10,000 denier is good). Further, the packing density of the crimp rigid yarn constituting the three-dimensional structure 14 is not limited to the to 0.05 g / cm ^2, as long as the order of about 0.035~0.060g / cm ² It can be selected arbitrarily, and the yarn structure of this crimped bristle yarn is also
The polyester bristle yarn is not limited to one formed by applying a polybutadiene-based resin to the surface, and may be nylon / polyester, polyethylene / nylon, polybutylene terephthalate / polyethylene terephthalate, polyvinyl chloride / polyester, polypropylene as a sheath / core component. Not only so-called sea core type conjugate fibers combining low melting point component such as polyester / high melting point component, but also polybutylene terephthalate / polyethylene terephthalate as one component (low melting point component) / other component (high melting point component) It is also possible to obtain a so-called side-by-side type composite fiber obtained by continuously molding two types of synthetic fiber components having similar properties into a side-by-side type. In short, it is only necessary that the material has excellent pressure resistance and water permeability and is as light as possible.

The cross section of the three-dimensional structure is a polygon or a circle. Examples of the polygon include a triangle, a quadrangle, a pentagon, and a hexagon. Among them, a triangle and a quadrangle are preferable.
More preferably, it is square, and particularly preferably rectangular. It is preferable that the fibrous structure 33 has elasticity so that the drainage material is sprayed onto the concrete surface so as to be tightly fixed to the concrete surface to prevent the concrete from entering. For example, a nonwoven fabric, tow, felt, or the like made of water-repellent fiber such as polyolefin (no oil agent) is preferably used.
In addition, as the fibrous structure 33, other materials such as ordinary fibers water-repellent with a fluorine-based resin or a silicone-based resin, such as polyolefin, polyamide, and polyester, can also be used. The cross section of the fiber structure may have any shape as long as it has the effects of the present invention.

Next, an example of use of the drainage material will be described. As shown in FIG. 3, after the drainage material 31 is pressed against the sprayed concrete surface 20 (at this time, the water-permeable sheet 32 is pressed against the sprayed concrete surface 20), the fiber structure 33 is sewn. An iron or plastic holding plate 21 is superimposed on the part of the water-impervious sheet 18, and the drainage material 31 is fixed to the concrete surface 20 by spraying with a nail 22. Then, due to the presence of the fibrous structure 33, the drainage material 31 is sprayed over the entire length of the concrete surface 20.
Since the fibrous structure 33 has water repellency, the concrete 24 is driven into the fibrous structure 33 even if concrete (not shown) is poured between the sprayed concrete surface 20 and the formwork 23. Three-dimensional structure 14
There is no intrusion inside. In the above explanation,
Although the case where the drainage material is applied to a tunnel has been described, the drainage material of the present invention can be widely applied not only to a tunnel but also to a case where a drain is constructed by driving concrete.

[0013]

As described above, the present invention provides a three-dimensional structure in which a water-impervious sheet and a water-permeable sheet face each other, and a long crimped bristle thread is entangled between the two sheets, and water repellency is provided on both sides thereof. The fiber structure having the shape of a river is arranged in the shape of a river, so that not only is it an integral structure and the handleability is good, but also because the presence of the fiber structure eliminates the gap between the impermeable sheet and the sprayed concrete surface Since the fibrous structure has water repellency, the intrusion of concrete can be prevented beforehand. In addition, the present invention has a sandwich structure in which the three-dimensional structure and the fibrous structure are sandwiched between the water impermeable sheet and the water permeable sheet. Began to improve.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a drainage material according to the present invention.

FIG. 2 is a front view including a partial cross section of a drainage material according to the present invention.

FIG. 3 is an explanatory view showing an example of use of a drainage material according to the present invention.

FIG. 4 is a perspective view of a tunnel.

FIG. 5 is an explanatory view showing a usage example of a conventional drainage material.

[Explanation of symbols]

 14 three-dimensional structure 18 water-blocking sheet 32 water-permeable sheet 33 fiber structure

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Atsushi Matsushita Atsushi No. 38, Okushime 38, Harue-cho, Sakai-gun, Fukui Prefecture F-term in Maeda Kosen Co., Ltd.

Claims (4)

[Claims] 1. A water-impervious sheet and a water-permeable sheet are opposed to each other,
A drainage material comprising a three-dimensional structure in which a long crimped bristle yarn is entangled between both sheets, and a fibrous structure having water repellency on both sides thereof is arranged in a river shape. 2. The drainage material according to claim 1, wherein the cross section of the three-dimensional structure is polygonal or circular. 3. The drainage material according to claim 1, wherein the water-repellent fibrous structure is made of a polyolefin fiber not provided with an oil agent. 4. The drainage material according to claim 1, wherein the water-repellent fibrous structure is made of water-repellent fibers other than polyolefin fibers.