JPH05263415A - Covered conduit drain - Google Patents

Abstract

PURPOSE:To increase tensile strength to provide uniform stabilized filtration over the full length by arranging a large number of narrow and flat resin-string strips longitudinally and laterally, welding the intersections thereof to form filter members, and spirally winding the filter members so that their side edge parts are overlapped on each other to form a pipe-main body. CONSTITUTION:Plain fablics are made by using a large number of narrow and flat resin-string strips made of polyethylene, etc. The intersections of weft and warp are welded to each other to form a flat band shape filter members 4 having a great number of filtration pores 3, 3 of a fixed size. The filter members 4 are spirally wound in order for the side edge parts of the filter members 4 to be overlapped on each other in sequence to form a pipe-main body 1. Then, reinforcing strip pieces 5 are wound around the overlapped side edges of the filter members 4 to be fused to be integrated. Thus, tensile strength of the pipe is increased to restrict elongation of the pipe, damage to the pipe at the time of laying can be eliminated, the shape of the pipe-main body 1 can be maintained in a good condition, and construction performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an underdrain drainage pipe which is buried and used in a golf course, a wetland, and other places.

[0002]

2. Description of the Related Art Conventionally, as a drainage pipe of this kind, as described in Japanese Utility Model Publication No. 54-27206,
A tape-shaped net is spirally wound so that the side edges thereof are sequentially overlapped to form a resin tube, and a filter material made of non-woven fabric or glass fiber or other woven cloth is provided between the overlapping portions of the net in the resin tube. And a structure in which a reinforcing strip is fused and fixed to the inner and outer peripheries of a resin pipe in a spiral shape, and a stretched film (slit yarn) with a large number of cuts is used as a filter material. A film having a large number of small holes formed by polymerizing a plurality of stretched films is used.

[0003]

However, according to the former underdrain drainage pipe, there is a possibility that mud and sand may enter into the fine gaps of the nonwoven fabric or the glass fiber as the filter material and the clogging may occur in a short period of time. In addition, since the resin pipe is formed of a net, when the drain pipe is pulled into the underdrain, the resin pipe is stretched and the filter material is broken, and muddy water flows into and accumulates in the drain pipe. was there.

On the other hand, the use of a filter material such as the latter solves such a problem, but since the shape of the small holes for filtering is indefinite, a uniform filtering action is achieved over the entire length. There is a problem that it is difficult to do.
An object of the present invention is to provide an underdrain drainage pipe that can solve such problems.

[0005]

In order to achieve the above object, the underdrain drainage pipe of the present invention is provided with a large number of narrow flat resin yarns 2, 2, ... As shown in the drawings corresponding to the embodiments.・ ・ 2
Are arranged vertically and horizontally and the intersecting portions thereof are welded to form a filter material 4 having a large number of filtration small holes 3, and the filter material 4 is spirally wound so that its side edges are successively polymerized. To form the pipe main body 1, and the reinforcing strip 5 is spirally wound around the overlapping side edge portion of the filter material 4 of the pipe main body 1 to form the reinforcing strip 5 and the overlapping side edge portion of the filter material 4. It is characterized by being fused and integrated.

[0006]

[Function] The large number of narrow flat resin yarns 2 constituting the pipe main body 1 exert an appropriate tensile strength to prevent the drain pipe from being stretched and eventually broken, and the filter material 4 is .. 2 are arranged by arranging the narrow flat resin yarns 2, 2, ... 2 vertically and horizontally and welding the intersecting portions thereof, the width of the narrow flat resin yarn 2 The filtration small holes 3 having a desired size are formed by the intervals between the adjacent narrow flat resin yarns 2, 2 and the like, so that the occurrence of clogging can be eliminated, and the size of these many filtration small holes 3 can be reduced. Since all are substantially constant, a uniform filtering action is exerted over the entire length of the drainage pipe.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.
1 is a resin tube as a main body, and is made up of a number of thin flat resin yarns 2, 2 ... 2 made of polyethylene or the like stretched in the length direction and is plain woven, and the intersections of the weft yarns and the warp yarns are welded to each other. By doing so, a flat belt-shaped filter material 4 having a large number of square filtration small holes 3, 3 ... 3 having a constant size is formed, and the filter material 4 is spirally formed on a molding shaft (not shown). Further, it is formed by sequentially winding one side edge portion of the previously wound filter material and the other side edge portion of the same filter material to be wound next so as to overlap by an appropriate width. The filter material 4 may be formed by arranging the large number of narrow flat resin yarns 2, 2, ... 2 at regular small intervals in the vertical and horizontal directions and welding the intersecting portions. Good.

The thin flat resin yarn 2 which constitutes the filter material 4 has a thickness of about 0.05 to 0.10 mm and a width of 2 mm.
The filter small holes 3 of the filter material 4 are formed to have a constant size in the range of 0.3 to 3 mm, and the size thereof is the arrangement interval of the narrow flat resin yarns 2 and 2. Can be easily set by.

The resin pipe main body 1 by the belt-shaped filter material 4
When forming, the polymerization width of the band-shaped filter material 4, that is,
Leading filter material 4a spirally wound on the molding shaft
It is desirable that the overlapping width of the trailing filter material 4b is 1/2 or more, and when it is spirally wound at 1/2 pitch, two sheets (2 layers) are stacked and 1/3 pitch (2/3 of each other). The width part is superposed), 3 pieces when spirally wound at 1/4 pitch,
It is possible to form the tube main body 1 having four stacked layers.

The reference numeral 5 is formed by spirally winding on the outer peripheral surface of the tube main body 1 on the overlapping side edge portion of the spirally wound filter material 4, and fusing the inner surface thereof to the filter material 4 for fusion. It is a thick strip reinforcing strip made of hard polyethylene resin, and its width is formed to be smaller than the overlapping width of the filter material.

This reinforcing strip 5 is provided when the pipe main body 1 is formed.
It is cooled and solidified in a state in which the inner layer of the semi-molten state is wound and wound into the small holes 3 of the polymerized portion of the filter material 4, and the one side edge of the reinforcing strip previously wound and Since the polymerized filter materials 4 and 4 between the other edges of the wound reinforcing strips are simply released in a superposed state, appropriate positions of the facing surfaces may be appropriately welded.

Reference numeral 6 denotes an inner peripheral surface of the pipe main body 1, which is spirally wound around the overlapping side edge portion of the spirally wound filter material 4, and the outer surface thereof is fused and integrated with the filter material 4. Although the inner strip-shaped reinforcing strip is formed, it can be used as an underdrain drainage pipe without providing this inner strip-shaped reinforcing strip.

The thus constructed drainage pipe is laid down by being drawn into the underdrain in the ground, and the water in the earth and sand that permeates below the ground flows into the pipe from the large number of filtration small holes 3 of the filter material 4. At this time, the filtering small holes 3 of the filter material 4 are formed by arranging a large number of narrow flat resin yarns 2 vertically and horizontally at regular small intervals and welding the intersecting portions thereof. A uniform size and shape are always maintained and a uniform filtering action is performed without opening or contracting. Moreover, since the narrow flat resin yarn 2 is stretched in the length direction, the tensile strength of the pipe main body 1 is increased, and in combination with the reinforcing strip 5, good shape retention and workability are exhibited. Is.

[0014]

As described above, according to the underdrain drainage pipe of the present invention, the filter material 4 forming the pipe main body 1 has a large number of narrow flat resin yarns 2, 2, ... Since it is formed by arranging vertically and horizontally and welding the intersections,
These narrow flat resin yarns 2 increase the tensile strength and suppress the elongation of the pipe, so that the pipe can be prevented from being damaged during the laying and the outer peripheral surface of the pipe main body 1 can be spirally formed. In combination with the action of the wound reinforcing strip 5, the pipe main body 1
The shape retention property is improved, the handling becomes easier, and the workability can be improved.

Further, a large number of narrow flat resin yarns 2, 2 ... Forming the filter material 4 are arranged vertically and horizontally and their overlapping intersections are welded to each other so that a large number of small filtration fibers can be obtained. Since the holes 3 are formed, all the filtering small holes 3 are formed in a substantially constant shape and size to prevent the occurrence of clogging and to provide a uniform filtering action over the entire length of the drainage pipe. It can be played.

[Brief description of drawings]

1 is a simplified side view of a portion of an underdrain drainage pipe,

FIG. 2 is a partially enlarged vertical side view of the same,

FIG. 3 is an enlarged plan view of a filter material.

[Explanation of symbols]

 1 Pipe main body 2 Narrow flat resin thread 3 Filter small hole 4 Filter material 5 Reinforcing strip

Claims (5)

[Claims] 1. A filter material having a large number of filtration small holes is formed by arranging a large number of narrow flat resin yarns vertically and horizontally and welding their intersecting portions, and the filter material is provided with its side edges. To form a tube main body by spirally winding so that the parts are sequentially polymerized, and a reinforcing strip is spirally wound around the overlapping side edge portion of the filter material of the pipe main body and the reinforcing strip and the filter material. An underdrain drainage pipe characterized by being fused and integrated with the overlapping side edge portion of. 2. The underdrain drainage pipe according to claim 1, wherein the pipe main body is formed by polymerizing a plurality of filter materials. 3. The underdrain drainage pipe according to claim 1 or 2, wherein the narrow flat resin yarn forming the filter material is a stretched film. 4. The underdrain drainage pipe according to claim 1 or 2, wherein the filter material is formed by plain weaving a narrow flat resin thread. 5. The underdrain drainage pipe according to claim 1, wherein a reinforcing strip is spirally polymerized and fused also on the inner peripheral surface side of the pipe main body.