JPH0396511A - Underdrainage pipe - Google Patents

Abstract

PURPOSE:To eliminate the occurrence of stopping up without being affected by the soil by winding and loading spirally long and narrow tapes of an overlapped film provided with a large number of fine holes in a state to overlap sides of them, and winding and loading reinforcing strips together as a unit on an overlapping section. CONSTITUTION:In a cylindrical resin pipe of which a main drainage pipe body is constituted, after a large number of parallel cuts are made to a pipe wall, two or more films formed by extending in the direction of the cuts are constituted of a textile material 1a formed by overlapping and welding so that the cutting direction and extending direction are at right angles to each other. Those long and narrow tapes are wound and loaded spirally in a state to overlap sides of them, reinforcing strips 2 are wound about the peripheral surface at a certain pitch, and they are welded together as a unit. According to the constitution, it exists in uniform density in the direction of the length and in the circumferential direction, and a positive and better drainage function can be maintained for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an underdrain drain pipe that is used by being buried underground in golf courses, wetlands, and other places.

[Conventional technology]

Traditionally, this type of drainage pipe was constructed using the
As described in Japanese Patent No. 206, a tape-like net is wound spirally so that the side edges of the net overlap one another to form a resin tube, and a nonwoven fabric is placed between the overlapping portions of the net in the resin tube. Alternatively, a structure is known in which a filter made of glass fiber or other woven fabric is compressed and reinforcing strips are helically fused and fixed to the inner and outer peripheries of a resin tube.

[Problem to be solved by the invention]

This kind of culvert drain pipe is laid in a culvert formed under the ground, and the muddy water that seeps into the ground is filtered by a filter and guided into the drain pipe, but the place where the culvert drain pipe is buried is There are various types of soil, such as muddy soil, clay, and gravel.
It cannot be applied to all these soil types.

In other words, in such filters, especially filters made of non-woven fabric, the filter is relatively thick, which increases the resistance to water passage, and the filtration action is not performed through the gaps between the woven fibers caused by the entanglement of the fibers. The filter is too fine to allow fine particles of mud to pass through, and these particles remain and accumulate between the fibers on the surface of the filter, causing clogging and rendering it unusable in a short period of time. There was a problem.

Furthermore, since the resin pipe is shaped like a net, when this pipe is installed in an underdrain, the resin pipe is stretched and the filter is torn, causing problems such as muddy water flowing into the drain pipe and accumulating. was there.

In addition, woven fabric coarsely woven with narrow flat threads has been used as a filter, but since the mesh is relatively coarse, there is a risk that even sandy soil may pass through. , misalignment occurs and the inflow of sand becomes even more intense.
It is not suitable for use as an underdrain drainage pipe.

The present invention provides an underdrain drain pipe that is almost unaffected by soil quality, eliminates the occurrence of clogging, and can exhibit stable drainage capacity for a long period of time.

[Means for Solving the Problems] In order to achieve the above object, in the underdrain drainage pipe of the present invention, the cylindrical resin pipe forming the main body of the pipe has a large number of parallel cuts in the stretching direction. 2 pieces of resin stretched film
A band-shaped tape made of a polymeric film having a large number of pores formed by polymerizing and fusing two or more sheets so that the cut directions are perpendicular to each other is wound spirally with the sides overlapping each other. The resin tube has a structure in which a reinforcing strip is integrally wound around the helical overlapping portion of the resin tube.

[For production]

The resin pipe that forms this underdrain drainage pipe is made of a material with many pores made by polymerizing and fusing two or more stretched films with many parallel cuts so that the directions of the cuts are perpendicular to each other. Because the pipe wall is thin, and the pores are in direct communication between the inner and outer peripheral surfaces of the pipe wall, the resistance to water passage is extremely small, and muddy water in the earth and sand can quickly and easily flow through the pores. , which enables smooth drainage and also allows fine particles of mud to pass through along with the mud water, thereby eliminating clogging.

Furthermore, even if the pores are closed by gravel, the gravel itself exerts a filtering action, so drainage efficiency will not be reduced.

Furthermore, since it is made of a stretched film, it has very high tensile strength, and even if a tensile action occurs on the pipe when laying it in a culvert, there is no risk of the pipe wall breaking, and the pipe wall Torsional strength and compressive strength are maintained by reinforcing strips spirally wound around the outer periphery of the stretched film, and in addition, the large number of pores formed by the intersection of the cuts made in this stretched film and polymerization always have a constant size. It maintains its shape and performs the above-mentioned reliable drainage function over a long period of time.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. ( ) is a cylindrical resin pipe that mainly constitutes a drain pipe, and the pipe wall has a large number of rectangular pores (3) (3 )...(3), and reinforcing strips (2) are spirally wound around the outer circumferential surface of the reinforcing strips (2) at regular pitches and are fused and integrated.

The above-mentioned woven material (1a) is generally referred to as split fabric, and is made by making many parallel cuts in a film such as polyethylene film with a thickness of about 0.07 to 0.15 mm, and then moving in the direction of the cuts. A stretched film, or a split film made by making a large number of cuts in the stretching direction of the stretched film using a stretched film such as a high-density polyethylene film, and at least two or more films having this large number of cuts are used. It is formed by polymerizing and fusing the pores (3) so that the cut direction and the stretching direction are perpendicular to each other, and the size of the pores (3) can be changed as appropriate depending on the width between the cuts. ,1
．． 0+nn+ or less, 0. It is preferably around 2 mm.

In order to shape the resin pipe (1) with such a material (1a), the material (la) is made into a strip tape of a desired width, and this strip tape is placed on a rotating shaft (not shown). It can be obtained by spirally wrapping the side edges so that they overlap one after another.

Specifically, while wrapping the tape in a spiral manner so that the next band-shaped tape portion overlaps the surface of the band-shaped tape previously wound on the rotating shaft by 1/2 of the width, that is, with a pitch shift of 1/2. As shown in FIG. The side edges (131a) of the 11F-shaped tape (13a) to be wound next overlap each other, and this overlap progresses in a spiral shape by the rotation of the forming shaft, thereby forming the resin tube (1). It is something.

In addition to winding the strip tape (1a) spirally at a 1/2 pitch in this way to form the pipe wall of the two-layered resin pipe (1), as illustrated in FIG. Tape (1a
) spirally wound at 1/3 or 1/4 pitch,
A tube wall with 3 or 4M layers may be used.

(2) is a reinforcing strip made of thick, hard polyethylene resin, etc. that is spirally wound on the overlapping side edge of the strip tape (1a) that forms the pipe wall of the resin pipe (1). Pipe (1)
When wrapping the reinforcing strip (2) in a spiral shape, the inner surface of the reinforcing strip (2) is heated and melted, and the inner surface is wound onto the overlapping part of the strip tape (1a), thereby forming the strip tape (1a). It is fused and integrated at the polymerization part.

In addition, as shown in FIG. 3, a reinforcing strip (3) may be fused and integrated with the inner peripheral surface of the resin pipe (1) in correspondence with the reinforcing strip (2). .

The underdrain drain pipe constructed in this manner is drawn into the underground drain and is laid to perform the above-mentioned drainage function.

〔Effect of the invention〕

As described above, according to the underdrain drain pipe of the present invention, the pipe wall of the resin pipe which is the main body of the drain pipe is formed by polymerizing two or more stretched films having a large number of parallel cuts so that the directions of the cuts are perpendicular to each other. Since it is made of a material with a large number of pores, the thickness is thin, and the pores are in direct communication between the inner and outer circumferential surfaces of the tube wall, so there is little resistance to water passing through. The extremely small pores allow muddy water other than sand and gravel in the earth and sand to flow quickly and easily into the pipe through the pores, allowing quick and smooth drainage compared to conventional drainage pipes made of non-woven fabric. In addition to significantly improving drainage efficiency, fine particles of mud can also pass through the pores along with muddy water, eliminating clogging, and there is almost no decrease in drainage capacity even after long-term use. be.

Furthermore, even if the pores are closed by gravel, the gravel itself exerts a filtering action, so there is almost no risk of deterioration in drainage efficiency.

Furthermore, since the pipe wall is made of stretched film, its tensile strength is extremely high, and even if the pipe is subjected to tension when being pulled into a culvert, the pipe wall is unlikely to be damaged. Since the reinforcing strip is spirally wound around the outer periphery of the tube wall, sufficient torsional strength and compressive strength can be maintained by the reinforcing strip.

Furthermore, since the above-mentioned large number of pores are shaped by the intersection and polymerization of the cuts made in the stretched film, they always maintain a constant size and shape and are uniform in the length direction and circumferential direction of the drain pipe. It exists at a high density and exhibits the above-mentioned reliable and good drainage effect over a long period of time.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view thereof, FIG. 2 is a partially enlarged sectional view of the same, and FIG. 3 is a partially enlarged sectional view showing another embodiment. (1) Resin pipe, (la) (lla) (12a
) (13a) - Band-shaped tape, (2)... Reinforcement strip, (3)... Pore.

Claims (1)

[Claims] (1) A cylindrical resin tube is made by polymerizing and fusing two or more sheets of stretched synthetic resin film with many parallel cuts in the stretching direction so that the directions of the cuts are orthogonal to each other. It has a structure in which a band-shaped tape made of a polymeric film with holes is wound spirally with the side parts overlapping each other, and a reinforcing strip is integrally wound on the spiral overlapping part of this resin tube. A culvert drainage pipe characterized by: