JPS63203987A - Underdrainage pipe and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a synthetic resin underdrain drainage pipe used buried in golf courses, wetlands, and other places.

(Prior art) Kono type culvert υ
As disclosed in Publication No. 27, a reinforcing strip made of hard synthetic resin is spirally wound at a constant pitch to form a tubular reinforcing piece, and the spiral gap between the reinforcing pieces is completely covered. The filtration band material made of soft synthetic resin or non-woven fabric is wound spirally, and the side edges of the filtration band material and the reinforcing piece are overlapped and bonded to each other. It is known that the crushing force acting on the body is received and stopped by a reinforcing piece, and the above-mentioned water content is received and drained into the pipe body through a filtering band material.

(Problems to be Solved by the Invention) Generally, hard synthetic resins and soft synthetic resins, or hard synthetic resins and nonwoven fabrics, have poor adhesion and have a weak adhesive force after joining. Therefore, in cases where a reinforcing piece made of hard synthetic resin and a filtration band made of soft synthetic resin or non-woven fabric are joined by overlapping their side edges as in the above-mentioned prior art, this joining part Since the adhesive strength of the filter is weak, it cannot withstand the crushing force and the force in the twisting direction that act on the tube body, and there is a problem that the filter strip material peels off from the reinforcing piece and becomes useless.

The present invention has been proposed in order to solve these conventional problems, and provides an underdrain drain pipe with excellent strength and durability by improving the joint between the filtration strip and the reinforcing piece. This is what I am trying to do.

(Means for Solving the Problems) As shown in FIGS. 1 and 2, which correspond to embodiments, the underdrain drainage pipe according to the first invention of this application is made of a soft synthetic resin or a nonwoven fabric for filtration. The filtration band material (1) is provided with a reinforcing piece (4) made of a hard synthetic resin that is spirally wound with a certain gap between the reinforcing piece (4).
It is wrapped around the spiral gap completely covering the gap, and both side edges (1a) (1b) of the filtration band (1) are
) is embedded in the reinforcing piece (4).

The underdrain drainage pipe according to the second invention of this application includes a filtration strip material (1) made of soft synthetic resin or nonwoven fabric, and a pair of reinforcing strip materials (2) and (3) made of hard synthetic resin. use,
These reinforcing strips (2), (3) are arranged on both sides of the filtration strip (1), and the reinforcing strips (2), (3) and the filtration strip (ri) are arranged in a spiral shape. During winding, both reinforcing strips (2) and (3) adjacent to each other are polymerized and welded to form a spiral tubular reinforcing piece (4), and each reinforcing piece (4) has the above-mentioned This filter is characterized by a configuration in which both side edges (la) and (Ib) of the filtration band material (1) are connected in a buried manner.

(Function) Due to the nature of the filtration strip material (1), there are gaps in the material that allow water to penetrate, and the reinforcing piece (4) is welded to the filtration strip material (1). Sometimes it appears semi-molten. Therefore, during this welding, the semi-molten hard synthetic resin infiltrates into the gaps in the material of the filtration band material (1) and is integrated after curing, so that the soft synthetic resin and the hard synthetic resin or the non-woven fabric can be combined. Even with a combination of hard synthetic resins with poor adhesion, it can be firmly bonded, and even when the tube is subjected to twisting force, crushing force, or even tensile force in the axial direction of the tube.
The bonded portion has such excellent strength that it is not easily broken, and its durability is also significantly improved.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, (I) is a filtration band material. This filtration band material (1) is constituted by a net-like body made of, for example, a polyolefin resin such as a soft polyethylene resin or a polypropylene resin, or a soft synthetic resin such as a polyvinyl chloride resin. This net-like body has a large number of slits formed in a constant order in the length and width directions of the soft synthetic resin film as described above, and each slit is expanded by applying a tensile force to the film. A large number of meshes are formed, and the several mesh films formed in this way are alternately turned in orthogonal directions and polymerized and welded to allow water to penetrate through the gaps between the multilayered meshes. This is what I did. Incidentally, this filtering band material (1) may be made of a nonwoven fabric.

(2) and (3) are a pair of reinforcing strips constituting the reinforcing piece (4). These reinforcing strips (2) and (3) are made of a hard synthetic resin, such as polyolefin resin or polyvinyl chloride resin, which is the same as the filtration strip (1), and each has a right triangular cross section. During molding, these triangular slopes are joined to form a reinforcing piece (4) with a rectangular cross section.
It constitutes. In addition, at the time of this joining, in order to avoid forming the joint part of both reinforcing strips (2) and (3) at the corner of the reinforcing piece (4), both reinforcing strips (2) and (3) are
) are asymmetrical with respect to each other.

These reinforcing strips (2) (3) and the filtration strip (1)
means that the reinforcing strip material f2) (3) is integrated at the same time as it is formed, and the strip-shaped material (5) formed by this is spirally wound at a constant pitch, and at the time of winding, each of the adjacent reinforcing strips is By welding the strips (2) and (3) to each other, an underdrain drain pipe in which reinforcing pieces (4) and filtration strips continue alternately is formed.

That is, in the underdrain drain pipe formed in this way, the filtration band material (1) is wrapped around the spiral gap interposed between the spiral tubular reinforcing piece (4) so as to completely cover this gap,
It has a structure in which both side edges 8B (ta) (Ib) of the filtering band material (1) are embedded in the reinforcing piece (4). Therefore, in this buried joint, the hard synthetic resin that is the material of the reinforcing piece (4) penetrates into the gap existing in the material of the filtration strip (1) and is integrally joined. Even if the combination of soft synthetic resin and hard synthetic resin, or non-woven fabric and hard synthetic resin, has poor adhesion, it will be firmly bonded and will not be subjected to twisting force or crushing force on the pipe body, or in the axial direction of the pipe body. Even when a tensile force is applied, the bond has such excellent strength that it does not easily break.

Next, a method for manufacturing the underdrain drain pipe having the above structure will be explained. In Figures 3 and 4, (B) shows reinforcing strips (
2) It is a molding die for molding (3).

This molding die (8) has a passage (7) for the filtering strip (1) passing through it in the length direction, and a reinforcing strip (2) (3).
) is formed with a resin supply path (8) for supplying the resin material. The resin supply path (8) branches into two directions in the middle, forming paths (9) and (9) for reinforcing strips (2) and (3), respectively.
10). Historically, each strip forming passage (9) (10)
merges with both ends in the width direction of the strip passageway (7), and these passageways (8), (9), and (10) form a common outlet passageway (11) near the exit.

A filtration band material (1) is continuously supplied to the band material passageway (7), and a hard synthetic resin material is cast into the resin supply path (8). This resin material branches from the resin supply path (8) and reaches each strip forming path (9) (10), and this path (9)
(10), the respective reinforcing strips (2) and (3) are formed, and at the same time both side edges (la) and (Ib) of the filtration strip (1) passing through the strip passageway (7) are formed into each reinforcing strip. Strip materials (2) (3)
The filtration strip material (1) is welded in a buried manner.
A strip-shaped material (5) having semi-molten reinforcing strips (2) and (3) arranged on both sides thereof is continuously extruded from the outlet passage (11).

This strip-shaped material (5) is supplied to a forming main shaft (13) of a forming apparatus (12) having a well-known configuration, and this forming main shaft (
13) is wound in a spiral shape with the rotation of
During this winding, both adjacent reinforcing strips (2) (3
) are continuously polymerized and welded to each other, so that both side edges (1a) (1b ) are bonded together in a buried manner to form a pipe body.

In this way, filtration strip material (1) and reinforcing strip material (2) (3)
According to a method in which the reinforcing strip material (2) (
The soft synthetic resin or nonwoven fabric, which is the material of the filtration strip (1), and the hard synthetic resin can be welded under optimal temperature conditions where the hard synthetic resin, which is the material of 3), is in a semi-molten state. .

In the embodiments described above, the present invention provides a pair of reinforcing strips (2) and (3) constituting the reinforcing piece (4), for example, as shown in FIG. is formed into a hook-shaped cross section, and the other reinforcing strip (3) is connected to the one reinforcing strip (2).
The reinforcing strips (2) and (3) are formed to have a rectangular cross-section that fits inside the reinforcing material and are joined between two orthogonal surfaces, or as shown in Figure 6, the reinforcing strips (2) and (3) are placed facing each other. Various embodiments are possible, such as one formed in an L-shape and joined at inclined joining surfaces (2a) and (3a). Further, the cross-sectional shape of the reinforcing piece (4) can also be made into various shapes such as a rectangular shape, a concave shape, a convex shape, etc.

Further, in the present invention, as a means for joining both side edges (1a) and (1b) of the filtering band material (1) in a buried manner in the reinforcing piece (4), for example, as shown in FIGS. 7 and 8, , each of the reinforcing strips (2) and (3) at the radially intermediate part of the reinforcing piece (4).
It is made into a divided shape, and the both side edges (la) and (Ib) of the filtration strip material (1) are joined to the joining surfaces (2a) (3a) l- of both reinforcing strip materials (2) and (3) to form a strip shape. A material (5) is formed, and when this strip material (5) is wound, both reinforcing strips (2) (
The both side edges (Ia) and (1b) of the embroidery application band material (1) may be sandwiched between the joint surfaces (2a and 3a) of 3) and polymerized and welded.

Furthermore, in the present invention, the filtering band material (+) and the reinforcing strip material (2)
(3), the filtration band material (1) and each reinforcing strip material (2) and (3) are individually guided onto the forming main shaft (Ia), and each is welded during winding. You can do it like this.

(Effects of the Invention) As explained below, according to the present invention, both side edges of the filtration strip are integrally embedded and connected in the reinforcing piece, so that the reinforcing piece made of hard synthetic resin and the reinforcing piece made of hard synthetic resin, Although it is a combination of filtering strips made of soft synthetic resin or non-woven fabric, which have poor adhesion, it can be bonded extremely firmly, making it possible to obtain an underdrain drain pipe with excellent crush resistance and durability. I thought it was possible.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing the main parts thereof, Fig. 3 is a partially cutaway front view showing an example of the forming means, and Fig. 4 5 is an enlarged sectional view of a main part of a molding die, FIGS. 5 and 6 are enlarged sectional views showing main parts of different embodiments, and FIG. 7 is an enlarged sectional view of a main part showing another embodiment of the present invention. , FIG. 8 is an enlarged cross-sectional view of section d of the forming means. (ri... Filtering band material, (1a) (1b)... Side edge of filtration band material, (2) (3)... Reinforcing strip material, (2a
)(3a)...Joining surface of reinforcing strip material, (4)...Reinforcing piece. Figure 1 Figure 2

Claims (4)

[Claims] (1) Filtering band material made of soft synthetic resin or nonwoven fabric (
1), and a tubular reinforcing piece (4) made of hard synthetic resin that is spirally wound with a gap, and the filtration band material (1)
) is wound around the helical gap of the reinforcing piece (4) so as to completely cover this gap, and the both side edges (1a) and (1b) of the filtering band material (1) are wrapped inside the reinforcing piece (4). An underdrain drainage pipe characterized by being connected in a buried manner. (2) Filtering band material made of soft synthetic resin or nonwoven fabric (
1) and a pair of reinforcing strips (2) made of hard synthetic resin.
(3), these reinforcing strips (2) (3) are arranged on both sides of the filtration strip (1), and the reinforcing strips (2) (
3) and the filtration strip material (1) are wound spirally, and during this winding, the reinforcing strip materials (2) and (3) that are adjacent to each other are polymerized and welded to form a spiral tubular reinforcing piece (4). At the same time, in each reinforcing piece (4), both side edges (
A method for manufacturing an underdrain drainage pipe, characterized in that 1a) and 1b are combined in a buried manner. (3) Filtering strip (1) inside each reinforcing strip (2) (3)
The both side edges (1a) (1b) of the reinforcing strip (2) (
3) The method for manufacturing an underdrain drain pipe according to claim 2, wherein the underdrain drain pipe is integrated in a buried manner at the same time as the molding. (4) Joint surfaces (2a) (3) of each reinforcing strip (2) (3)
a) Both side edges (1a) (1b) of the filtering band material (1) between
Claim 2, which is sandwiched and polymerized and welded.
The manufacturing method of the underdrain drainage pipe described in Section 1.