JPH011814A - Underdrain drain pipe and its manufacturing method - 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 an underdrain drain pipe that is used by being buried underground in golf courses, wetlands, and other places, and a method for manufacturing the same.

[Prior art] Conventionally, this type of drainage pipe has been developed using the
As described in Publication No. 206, a tape-like net is wound spirally so that the side edges thereof sequentially overlap each other to form a resin tube, and at the same time, a tape-like net is wound between the overlapping portions of the net in the resin tube. A structure is known in which a filter made of nonwoven fabric, 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 type of culvert drainage 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 drainage pipe is buried There are various types of soil, such as muddy soil, clay, and gravel.
It cannot be applied to all these soil types.

That is, in such filters, especially filters made of non-woven fabric, the filter is relatively thick, which increases the resistance to water passage, and the filtering action is performed through the gaps between the fibers created by the entanglement of the fibers. The mesh 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 the filter unusable in a short period of time. There was a problem.

Furthermore, since the resin pipe is made of net, when the 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. there were.

In addition, woven fabric coarsely woven with narrow flat threads has been used as a filter, but since the opening 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.

Furthermore, the band-shaped tape made of such a woven fabric is spirally wound so that the end edges thereof overlap to form a tubular body, and reinforcing strips are provided on the side edges of the tape in the outermost layer of the tubular body. When the reinforcing strip is wrapped and welded together with the tape by melting the bottom of the reinforcing strip, the tape also melts and its strength decreases, causing stress such as bending during handling or construction of the drain pipe, or during construction. There were problems such as the inability to withstand later external pressure.

The present invention provides an underdrain drain pipe that is almost unaffected by soil quality, eliminates clogging, and can be used for a long period of time, and a method for manufacturing the same.

[Means to solve the problem]

In order to achieve the above object, the culvert drainage pipe of the present invention has a cylindrical pipe wall formed by stacking and welding a stretched film with a split film having fine cracks in the stretching direction in a perpendicular direction. It has a structure in which a strip of fabric with pores is wound spirally with the side parts overlapped with each other, and a reinforcing strip is placed on the side edge of the overlapping part of the strip of fabric that forms the tube wall. It is characterized in that it is wound spirally with a low-melting point resin tape interposed therebetween, and the reinforcing strip and the side portion of the band-shaped split fabric are fixed together by melting the low-melting point resin tape.

In addition, as a manufacturing method for such an underdrain drain pipe, a split film with many pores is formed by overlapping and welding a stretched film with fine cracks in the stretching direction at right angles. The split fabric is formed into a band of a predetermined width, and the split fabric is wound spirally around a forming shaft so that the side edges overlap one after another to form the main body of the tube. A reinforcing strip is wound around the overlapping side edge of the cloth via a low melting point resin tape, and the reinforcing strip and the overlapping side edge of the strip-shaped cloth are fused together by melting the low melting point resin tape. It is characterized by:

[For production]

The pipe wall of this underdrain drainage pipe is made of split cloth with many pores formed by orthogonal polymerization and fusion of split films, so it is thin and the pores are formed on the inner and outer peripheries of the pipe wall. Since there is direct communication between the surfaces, the resistance to water passing through is extremely small, and the muddy water in the earth and sand can flow quickly and easily, allowing for smooth drainage and allowing fine particles of mud to pass along with the muddy water, preventing clogging. It is possible to eliminate the occurrence of

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 the split cloth is made of stretched film, it has very high tensile strength, so even if a tensile action occurs on the pipe when laying it in a culvert, there is no risk of damage to the pipe wall, and the pipe wall will not be damaged. Tear strength and pressure resistance are maintained by the reinforcing strip wound spirally around the outer circumference of the tube.Moreover, this reinforcing strip is wrapped spirally on the split cloth that constitutes the tube wall via a low-melting point resin tape. Since the reinforcing strip and the split fabric are fixed together by melting this low-melting point resin tape, it is possible to firmly fix both without melting the split fabric, and the reinforcing strip can be By making it possible to use a thin and thick material, the effective drainage area of the divided cloth is increased, and the pressure resistance is further improved. Therefore, the above-mentioned good drainage effect can be maintained for a long period of time. It's something you get.

In addition, continuous production is possible for this kind of underdrain drainage pipe because the main body of the pipe is formed by winding a strip of cloth in a spiral shape on a forming shaft so that the side edges are sequentially overlapped. Moreover, a reinforcing strip is wrapped around the overlapping side edge of this band-shaped divided cloth via a low-melting point resin tape, and the reinforcing strip and the overlapping side edge of the band-like divided cloth are melted by melting the low-melting point resin tape. Since the reinforcing strips and the split fabric are fused together, the reinforcing strip and the split fabric can be reliably and firmly integrated without melting the split fabric. It is possible to easily manufacture an underdrain drainage pipe in which the wall maintains a predetermined shape and a large number of pores provided in the split cloth are present at a uniform density in the length direction and circumferential direction.

〔Example〕

To explain the embodiment of the present invention with reference to the drawings, (1) is mainly a drain pipe, and its cylindrical pipe wall (2) has a thickness of 0.0
By making two or more split films obtained by making fine cracks in the stretching direction of a stretched film such as a high-density polyethylene film of about 7 to 0.15 mm, overlapping them at right angles to each other and welding them together. It is constructed by using a formed band-shaped cloth (3) of a constant width, and sequentially wrapping this band-like cloth (3) in a spiral shape so that the side edges overlap, Therefore, due to the orthogonal polymerization of split films having a large number of parallel cracks, the pipe wall (2) has a large number of fine rectangular meshes of 1.0 mm or less in size, with an average mesh communicating in an open state between the inner and outer peripheral surfaces of the pipe wall (2). Shape pore (4) (4)
...(4) is formed.

(5) is a narrow, low-melting synthetic resin such as soft polyethylene that melts at a lower temperature than the split cloth (3), which is spirally wrapped around the side edge of the strip of split cloth (3) on the outer peripheral surface of the tube wall. A strip-shaped reinforcing strip (6) made of hard polyethylene resin or the like having the same width and thickness as the tape (5) is placed on this piece of tape.
) are overlapped and wound spirally, and by heating and melting the synthetic resin tape (5), this tape (5) is fused to the bottom surface of the reinforcing strip (6) and forms the tube wall (2). The pores (4) of the split cloth (3) are filled with molten resin and solidified to bond the tube wall (2) and reinforcing strip (6) together.

In addition, as shown in FIGS. 3 and 4, such a synthetic resin tape (5) is interposed between the polymerized cloth (3) (3) corresponding to the bottom surface of the reinforcing strip (6). Furthermore, it may be wrapped around and fused to the inner surface of the split cloth (3) on the inner peripheral surface of the tube wall. With this configuration, the synthetic resin tape (5) ), a portion of the molten resin sufficiently infiltrates into the pores (4) extending from the bottom of the reinforcing strip (6) to the innermost layer of the split fabric (3) and solidifies, resulting in even stronger adhesion. It is something that can be done.

Next, to describe the method for manufacturing the underdrain drain pipe constructed in this way, it is obtained by making a stretched film such as a high-density polyethylene film with a thickness of about 0.07 to 0.15 ffv+ by making fine cracks in the stretching direction. A split fabric is obtained by stacking two or more of the split films in sequence at right angles to each other and welding them together, and this split fabric is cut and formed into strips of a certain width to form a strip of split fabric (3). .

As shown in FIG. 5, this band-shaped split cloth (3) is wound spirally around a forming shaft (7).

At this time, make sure that the next band-shaped cloth part overlaps the surface of the previously wrapped band-shaped cloth (3) by a width of 172, that is,
The tube wall (2) is formed by winding it spirally with a pitch shift of 1/2.

In addition, the band-shaped cloth (3) that is wrapped first and becomes the inner layer
The overlapping pitch of the other width part of the band-shaped cloth (3) which is wound on top of the half width part and becomes the outer layer is spiral with a pitch of 1/3 or 1/4 in addition to 1/2. The pipe wall is rolled in a shape with a thickness of 3 and 4 layers (2
) may be formed.

The tube wall (2) formed in this way has a band-like split cloth (3
It moves forward while being rotated spirally on the forming shaft in synchronization with the feed of the band-shaped cloth (
Following the spiral winding of 3), the strips of cloth (
A narrow synthetic resin tape (5) made of soft polyethylene or the like having a lower melting point than the split cloth (3) is spirally wrapped around the side edges of the outermost layer (3), that is, the ears, and further, this synthetic resin tape (5) A reinforcing strip (6) made of hard polyethylene resin or the like having the same width and thickness as the synthetic resin tape (5) is wound spirally on top, and the synthetic resin tape (5) is heated and melted. A part of the molten resin is filled into the pores (4) of the split cloth (3) and fused to the bottom surface of the reinforcing strip (6),
Reinforcement strips (6) are formed on the split cloth (3) by solidification by cooling.
This is to fix them together.

In addition, when wrapping the band-shaped cloth (3) as necessary, the polymerized cloth (3) (3) corresponding to the bottom surface of the reinforcing strip (6) may be wrapped.
) may be fused with a synthetic resin tape (5) interposed between them;
A synthetic resin tape (5) may be wrapped and fused to the inner surface of the holder.

The synthetic resin tape (5) is heated and melted using the molding shaft (7).
It may be carried out immediately before supplying the material, or it may be carried out after wrapping, and in this case, the reinforcing strip (6) and the split cloth (3) are melted at a temperature lower than that of the material. It is something.

In this way, when the tape (5) melts, the reinforcing strip (6)
) and the split fabric (3) constituting the tube wall (2) are adhered and integrally fixed through the tape (5), and a portion of the melted tape piece penetrates into the pores of the split fabric (3). (4) Infiltration into the
It is filled and solidified in that state, allowing strong adhesion without melting the split cloth (3).

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

〔Effect of the invention〕

As described above, according to the underdrain drainage pipe of the present invention, the pipe wall is made of split cloth with a large number of pores made of orthogonal polymerization and fusion of split films, so the thickness is small. Since it 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, allowing muddy water other than sand and gravel in the earth and sand to quickly and easily flow into the pipe through the pores. Therefore, rapid and smooth drainage is possible, and drainage efficiency is significantly improved compared to conventional drainage pipes made of non-woven fabric, etc., and fine particles of mud are also passed through the pores along with muddy water, preventing clogging. It is possible to eliminate the occurrence of water, and there is almost no decrease in drainage capacity even after long-term use.

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 split fabric is made of stretched film, it has very high tensile strength, so even if a tensile action occurs on the pipe when it is being pulled into a culvert, it is unlikely to cause damage to the pipe wall. Since the reinforcing strip is spirally wound around the outer periphery of the pipe wall, sufficient torsional strength and pressure resistance can be maintained by this reinforcing strip. The reinforcing strip and the split fabric are wrapped in a spiral shape on the split fabric that makes up the pipe wall, and the reinforcing strip and the split fabric are fixed together by melting this low-melting point resin tape, so they are firmly bonded together without melting the split fabric. In addition to making it possible to use thin reinforcing strips and thick walls, the effective drainage area of the split fabric is increased, and the pressure resistance is further improved. The drainage effect can be maintained for a long period of time.

In addition, in order to manufacture such an underdrain drainage pipe, the main body of the pipe is formed by winding a strip of cloth in a spiral shape on a forming shaft so that the side edges are sequentially overlapped. It can be easily produced continuously and is suitable for mass production.
In addition, the reinforcing strip is wrapped around the overlapping side edge of the band-shaped split fabric via a low-melting point resin tape, and the reinforcing strip and the overlapping side edge of the band-shaped split fabric are integrated by melting the low-melting point resin tape. Since the reinforcing strips and the split fabric are fused together, the reinforcing strip and the split fabric can be reliably and firmly integrated without melting the split fabric. It is possible to easily manufacture an underdrain drain pipe with good drainage efficiency, in which the shape of the pipe is maintained, and a large number of pores provided in the split cloth are present at a uniform density in the lengthwise and circumferential directions.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a simplified partially sectional front view, FIG. 2 is a partially enlarged sectional view, and FIG. 3 is a partially enlarged sectional view.
FIG. 4 is an enlarged sectional view showing another embodiment of the present invention,
FIG. 5 is a front view showing the manufacturing method. (])...Drain pipe main body, (2)...Pipe wall, (3)...
...band-shaped split cloth, (4)...pores, (5)...low melting point resin tape, (6)...reinforced strip, (7)...shaft for molding. Figure 1 Figure 2

Claims (2)

[Claims] (1) The cylindrical tube wall is made of a strip of fabric with many pores formed by stacking and welding split films with small cracks in the stretching direction at right angles to the stretched film. It has a structure in which the reinforcing strips are wrapped in a spiral shape in a state where they are overlapped with each other, and a reinforcing strip is wrapped in a spiral shape with a low melting point resin tape interposed on the side edge of the overlapping part of the band-shaped split fabric that formed the pipe wall. , an underdrain drain pipe in which the reinforcing strips and the side portions of the strip-shaped cloth are fixed together by melting this low-melting point resin tape. (2) A split film with a large number of pores is formed by overlapping and welding split films with small cracks in the stretching direction at right angles, and this split film has a predetermined width. The strip-shaped fabric is formed into a strip and wound spirally on a molding shaft so that the side portions are sequentially overlapped to form a tube main body, and a low melting point resin is applied onto the polymerized side edge of the strip-shaped fabric. A method for manufacturing an underdrain drainage pipe, which comprises wrapping a reinforcing strip through a tape, and melting the low-melting point resin tape to fuse the reinforcing strip and a polymerized side edge of a band-shaped split cloth together.