JPH0587607B2 - - Google Patents

Description

[Detailed description of the invention]

【0001】

TECHNICAL FIELD The present invention relates to a synthetic resin underdrain drainage pipe that is used by being buried underground in golf courses, wetlands, and other places.

【0002】

[Prior Art] Conventionally, this type of underdrain drainage pipe has been made by winding a mesh tape made of soft synthetic resin in a spiral shape so that the side edges of the tape are sequentially overlapped to form a cylindrical pipe wall. , a reinforcing strip made of hard synthetic resin is wound around the overlapping side edge of the tube wall, and the bottom of the reinforcing strip is melted to integrally weld the reinforcing strip to the outer peripheral surface of the tube wall. It is known that the structure is as follows.

【0003】

[Problems to be Solved by the Invention] However, when manufacturing such an underdrain pipe,
In order to fuse the reinforcing strip onto the mesh tape, at least the bottom part of the reinforcing strip must be melted, but this reinforcing strip is made of hard synthetic resin and is more durable than the mesh tape made of soft synthetic resin. The melting temperature is high, so if the bottom of the reinforcing strip is melted and fused to the mesh tape, the mesh tape will also melt and the strength of the fused portion will be extremely reduced.
When handling it as an underdrain drainage pipe or during construction, there was a problem that it could not withstand stress such as bending or external pressure after construction.
It is an object of the present invention to provide an underdrain drain pipe that can solve these problems and has high strength and excellent drainage ability.

【0004】

[Means for Solving the Problems] In order to achieve the above object, the culvert drainage pipe of the present invention has a cylindrical pipe wall that intersects several stretched films having a large number of fine cuts in the stretching direction. A belt-shaped filtration medium having a large number of filtration pores superimposed in one direction, and a synthetic resin having a melting point equal to or lower than that of the belt-shaped filtration medium to form a mesh larger than the filtration pores of the filtration medium. It has a structure in which a band-shaped material polymerized with a band-shaped net material is wound spirally with its side edges overlapping each other, and a synthetic resin reinforcing strip is wound spirally on this polymerized side edge. It has a structure in which the two parts are fused and integrated.

[0005]

[Function] With this structure, when manufacturing this underdrain drainage pipe, the net material made of semi-molten low melting point synthetic resin acts as a binder to weld the reinforcing strips to the pipe wall. Welding of the reinforcing strip to the outer circumferential surface of the tube wall is reliably performed. Furthermore, since the mesh material is made of a synthetic resin with a melting point that is approximately the same as or lower than that of the filter material, the filter material will not be melted by the semi-molten mesh material; When this net material is hardened, it acts as a reinforcing member for the filter material, increasing the tensile strength and circumferential torsional strength of the filter material.

[0006] In addition, since the filter material is made by stacking stretched films with many fine cuts in the stretching direction in the perpendicular direction, it is thin and has a large number of filters formed by polymerization. Since the small holes are in direct communication between the inner and outer peripheral surfaces of the pipe wall, the resistance to water passage is extremely small, allowing the muddy water in the earth and sand to flow quickly and easily, allowing smooth drainage and removing fine particles of the muddy soil. can be passed along with muddy water to prevent clogging.

[0007] Furthermore, the filter material made of stretched film has a very strong 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 Torsional strength and compressive strength can be maintained by reinforcing strips spirally wound around the outer periphery of the wall.

[0008]

[Embodiment] To explain an embodiment of the present invention with reference to the drawings, A is an underdrain drainage pipe, the cylindrical pipe wall 1 of which is formed from a film or sheet-like material made of a filter material 11 and a mesh material 12. There is. The filtering material 11 is a resin film made of soft polyethylene resin and having a thickness of about 0.1 to 0.5 mm, and includes at least two stretched films each having a large number of fine cuts in the stretching direction, and the cuts intersect with each other. A sheet-like material having a large number of filter pores 13 is formed by stacking them on top of each other, and this sheet-like material is cut into strips of a predetermined width. A stretched resin tape having an appropriate thickness and having small-diameter meshes or holes may also be used.

[0009] On the other hand, the net material 12 is made of a soft polyethylene resin, and its melting point is equal to or lower than that of the filtration material 11, and is formed in a conventional manner using existing net manufacturing equipment, and is It is used as a band-like net material 12 having the same width as the material 11. Note that the shape of the mesh 14 of this mesh material 12 is square,
The mesh 14 may have any shape such as a hexagon or a rhombus, but the size of the mesh 14 depends on the size of the filter medium 11.
larger than the small filter hole 13, for example 2 x 2 mm ~
Approximately 8 x 8 mm is appropriate.

[0010] Then, a net material 12 is placed on the filter material 11.
The above-mentioned cylindrical tube wall 1 is formed by winding a polymerized strip material obtained by polymerizing the material in a spiral manner so that the side edges of the material are sequentially overlapped.
is formed.

[0011] The method of forming the pipe wall 1 of the underdrain drain pipe A by spirally winding the polymerized band material of the filter material 11 and the net material 12 in this way is well known, and detailed explanation will be omitted. It is preferable that the net material 12 is polymerized onto the filter material 11 immediately before it is spirally wound as a strip material. Specifically, the net material 12 continuously produced by a net manufacturing device is supplied onto the filter material 11. It is desirable that the tube wall 1 be formed by winding the strip material in a spiral immediately after forming the strip material.

[0012] Reference numeral 2 denotes a reinforcing strip made of hard polyethylene resin, which is spirally wound on the overlapping part of the strip material constituting the tube wall 1.
They are integrally fixed through the melting of the two parts.

[0013] In the underdrain drain pipe configured in this way, the melting point of the reinforcing strips 2 is higher than that of the filter material 11, and for example, the semi-molten reinforcing strips 2 are used as the filter material 11.
If the filter material 11 is directly stacked on top of the other, it will melt and break, but since the net material 12 is interposed between the filter material 11 and the reinforcing strips 2 as described above, The net material 12 is formed by the molten reinforcing strips 2.
is only melted, and the filter material 11 is not melted. Moreover, this melted net material 12 serves as a binder for fixing the reinforcing strips 2 on the filter material 11, and this reinforcing strip material 2 to tube wall 1
This is to ensure that it is firmly fixed to the outer peripheral surface of.

[0014] In addition, in the above embodiment, the net material 12 was superimposed on the filter material 11, but this net material 1
2 may be attached to the lower side of the filter medium 11 as shown in FIG. When the netting material 12 is attached to the lower side of the filtering material 11, the netting material 12 leaks onto the surface of the filtering material 11 through the mesh 14 of the filtering material 11 and acts as a binder for fixing the reinforcing strips 2. be.

【0015】

Effects of the Invention As described above, according to the underdrain drainage pipe of the present invention, the cylindrical pipe wall forms a mesh with a band-shaped filter material and a synthetic resin having a melting point equal to or lower than that of the band-shaped filter material. A polymerized strip material with a strip net material made of the same material is wound in a spiral manner with the side edges thereof superposed on each other, and a synthetic resin reinforcing strip is spirally wound on the polymerized side edges. Since it has a structure in which the underdrain drainage pipe is manufactured by welding it together, the mesh material made of a semi-molten low melting point synthetic resin is used as a binder to weld the reinforcing strips to the pipe wall. As a result, the reinforcing strip can be firmly welded and integrated with the outer circumferential surface of the tube wall.

[0016] Furthermore, since the net material is made of a synthetic resin with a melting point that is approximately the same as or lower than that of the filtration material, there is no possibility that the filtration material will be melted by the semi-molten net material. Furthermore, when the net material is hardened, it acts as a reinforcing member for the filter material, and can improve the tensile strength and circumferential torsional strength of the filter material.

[0017] In addition, the filter material is thin because it is made by stacking several sheets of stretched film with many fine cuts in the stretching direction in the cross direction.
In addition, the large number of filter pores formed by polymerization are in direct communication between the inner and outer peripheral surfaces of the pipe wall, so the resistance to water passage is extremely small, allowing muddy water in the earth and sand to flow quickly and easily. can, therefore,
Smooth drainage is now possible, and drainage efficiency is significantly improved compared to conventional drainage pipes made of non-woven fabric, etc., and fine particles of mud can also pass through along with the muddy water, eliminating clogging. Despite its use, there is almost no decrease in drainage capacity.

[0018] Furthermore, the filter material made of stretched film has very high tensile strength, so even if a tensile action occurs on the pipe when laying it in an underdrain, there is no risk of damage to the pipe wall, and the pipe Torsional strength and compressive strength can be maintained by reinforcing strips spirally wound around the outer periphery of the wall.

[Brief explanation of drawings]

[Figure 1] Front view,

[Figure 2] Longitudinal cross-sectional view of the main part,

FIG. 3 is a vertical sectional view of main parts showing another embodiment.

[Explanation of symbols]

1 Pipe wall 2 Reinforcement strips 11 Filter material 12 Net material 13 Filter small hole 14 Mesh.

Claims (1)

[Claims] 1. A belt-shaped filter material in which a cylindrical tube wall is formed by stacking several sheets of stretched film in which many fine cuts are made in the stretching direction in the cross direction and providing a large number of small filtration holes; Polymerization with a belt-like mesh material made of a synthetic resin with a melting point equal to or lower than that of the filter material to form a mesh larger than the filtration pores of the filter material. 1. An underdrain drainage pipe having a structure in which the pipe is wound in a shape, and a synthetic resin reinforcing strip is spirally wound on the polymerized side edge and fused and integrated.