JPH0524282B2 - - Google Patents

Description

[Detailed description of the invention]

[0001]

TECHNICAL FIELD The present invention relates to improvements in synthetic resin underdrain drain pipes used buried in golf courses, wetlands, and other locations.

[0002]

[Prior Art] Conventionally, this type of underdrain drainage pipe has been formed into a tubular body by sequentially winding and fixing a plurality of synthetic resin mesh tapes in a spiral manner so that their end edges overlap. It has a structure in which reinforcing strips are wrapped around the side edges of the outermost mesh tape of the tubular body.

【0003】

[Problems to be Solved by the Invention] However, according to the above structure, the mesh tape between the spirally wound reinforcing strips overlaps each other without adhesive, which makes it difficult to drain water. As the degree of freedom of deformation of the tube increases, it becomes impossible to maintain the desired firmness, and as a result of twisting and bending, the mesh tapes a, a of the inner and outer layers are damaged by the adjacent reinforcing strips b, as shown in FIG. There is a problem in that the parts b are spaced apart or wavy wrinkles occur, resulting in deterioration in strength.

[0004] The present invention aims to provide an underdrain drain pipe that eliminates such problems.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the underdrain drainage pipe of the present invention is made of a plurality of synthetic resin sheets each having a large number of rectangular meshes, as shown in the drawings corresponding to the embodiments. The drain pipe main body 1 is formed by sequentially winding the mesh tape 2 in a spiral manner so that the end edges overlap each other, and reinforcing strips are placed on the side edges of the outermost layer of the mesh tape 2 of the drain pipe main body 1. In a culvert drainage pipe formed by wrapping 4, adjacent reinforcing strips 4,
mesh tape 2 of the inner and outer layers in the middle part between 4;
A thin synthetic resin strip 3 is interposed between the tapes 2 and 2, and the mesh tapes 2, 2 of the inner and outer layers are integrally bonded by melting the synthetic resin strip 3. .

[0006]

[Function] The opposing surfaces of the inner and outer layer mesh tapes 2, 2 are bonded together by the synthetic resin strip 3 at the intermediate portion of the reinforcing strips 4, 4 adjacent in the length direction, so that they do not separate. This increases the torsional strength, imparts desired stiffness or shape retention to the drain pipe, and improves ease of handling.

[0007]

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings.
The drainage pipe is mainly composed of synthetic resin mesh tapes 2, 2...2 with a multilayer structure, and a plurality of mesh tapes 2 are spirally arranged around a mandrel (not shown) so that their side edges overlap. It is made by sequentially winding layers.

[0008] As the reticulated tape 2, for example, after forming a large number of slits in a resin film such as polyethylene resin with a thickness of about 0.1 to 0.5 mm, and then stretching it in the direction of the slits, or after stretching the resin film, A large number of slits are formed in the stretching direction, and the slits are stretched in the width direction so as to be slightly widened, and a plurality of stretched films thus obtained are polymerized so that the stretching directions are perpendicular to each other. A tape with a multi-layered structure having a rectangular mesh is formed (generally called a split cloth) and is used by cutting it into strips of a predetermined width, but tapes with other structures are used. ,for example,
A sheet-like material obtained by using a resin tape with a desired thickness that has many meshes and small holes, or by polymerizing and welding a large number of resin single threads, resin twisted threads, or narrow band-shaped threads in a manner that they intersect with each other. You may use objects.

[0009] In order to use a plurality of such mesh tapes 2 to form the drain pipe main body 1, as described above, first, the mesh tape 2 is wound spirally around a mandrel, and the mesh tape 2 is A state in which the following mesh tape 2 is shifted by 1/2 width from the surface of the mesh tape 2 as the leading tape, that is,
It is formed by sequentially winding a plurality of mesh tapes 2 in the same manner by winding them in the same spiral shape even if the pitch is shifted by 1/2.

[0010] The overlapping pitch of the mesh tape 2 on the outer layer side with respect to the mesh tape 2 on the inner layer side is 1/
In addition to 2, the layers may be spirally wound with a pitch of 1/3 or 1/4.

[0011] Reference numeral 4 denotes a narrow reinforcing strip made of hard polyethylene resin, etc., which is spirally wound on the polymerized side edge of the outermost layer of the reticulated tape 2. Also on the inner and outer surfaces, reinforcing strips 5 are wound and layered so as to face the reinforcing strips 4, and a plurality of mesh tapes 2, 2 are layered spirally by these reinforcing strips 4, 5. It is fixed and reinforced.

[0012] A synthetic resin tape piece 6 that melts at a lower temperature than these reinforcing pieces 4 and the net tape 2 is interposed between the bottom surface of the outer reinforcing strip 4 and the outermost layer of the net tape 2, and this composite If the reinforcing strip 4 is integrally bonded to the mesh tape 2 by melting the resin strip 6, the mesh tape 2 and the reinforcing strip 4 can be firmly bonded together without melting the mesh tape 2. .

[0013] 3 is a reinforcing strip 4 adjacent in the length direction,
mesh tape 2 of the inner and outer layers at the intermediate position between 4;
A string-like or thin tape-like synthetic resin strip interposed between the mesh tape 2 and made of a resin material such as polyethylene that melts at a lower temperature than the mesh tape 2, which is opposed by the melting of the synthetic resin strip 3. The mesh tapes 2, 2 of the inner and outer layers are bonded together.

[0014] As described above, this synthetic resin strip 3 is used when forming a drain pipe by winding the mesh tape 2 around a mandrel in a spiral manner.
The synthetic resin strip 3 is supplied so as to be sandwiched between the tapes 2 and 2, and is wound spirally together with the mesh tape 2. The synthetic resin strip 3 is heated and melted while being supplied to the mandrel to form a mesh tape. The synthetic resin strip 3 may be wound onto the tape 2, and after being wound, the synthetic resin strip 3 may be melted at a low temperature that does not melt the reticulated tape 2.

[0015] The underdrain drain pipe configured as described above is constructed by interposing the reinforcing strips 4, 4 between the reinforcing strips 4, which are spirally wrapped by the synthetic resin strips 3 interposed and welded between the mesh tapes 2, 2 of the inner and outer layers. Since the wound layer reticulated tape portion in the middle part is bonded together, separation between the inner and outer layer reticulated tapes 2, 2 is prevented, increasing torsional strength and exhibiting desired shape retention. .

[0016]

Effects of the Invention As described above, according to the underdrain drain pipe of the present invention, a plurality of synthetic resin mesh tapes having a large number of mesh holes are sequentially wound in a spiral shape so that their side edges overlap. In an underdrain drain pipe, in which a reinforcing strip is wound around the side edge of the outermost mesh tape of the drain pipe main body, the inside and outside of the intermediate portion between adjacent reinforcing strips are A thin strip of synthetic resin is interposed between the mesh tapes of the layers, and the mesh tapes of the inner and outer layers are integrally bonded by melting the synthetic resin strip.
The facing surfaces of the inner and outer mesh tapes are bonded together by synthetic resin strips at the intermediate portions of longitudinally adjacent reinforcing strips, so they do not separate from each other, and the bonded portions Desired firmness or shape retention can be imparted to the drain pipe, and handling properties are improved.

[0017] Furthermore, the molten synthetic resin strip can solidify while penetrating into the mesh of the mesh tape, further strengthening the adhesive strength. Since it occupies only a small portion of the net tape, it does not interfere with the filtering action of the mesh tape.

[Brief explanation of drawings]

[Fig. 1] A simplified front view with a part of the culvert drainage pipe according to the present invention in cross section.

[Figure 2] Partially enlarged view

[Figure 3] A partial cross-sectional view of a conventional underdrain drain pipe showing a state in which the inner and outer layers of mesh tape are separated.

[Explanation of symbols]

1 Mainly drain pipe 2 Reticulated tape 3 Synthetic resin strip 4 Reinforcement strip

Claims (1)

[Claims] Claim 1: A main body of a drain pipe is formed by sequentially winding a plurality of synthetic resin mesh tapes having a large number of small mesh holes in a spiral shape so that their side edges overlap. In an underdrain drainage pipe in which a reinforcing strip is wrapped around the polymerized outer peripheral edge of the outermost layer of mesh tape, a narrow synthetic resin is used between the mesh tapes of the inner and outer layers in the intermediate portion between adjacent reinforcing strips. 1. An underdrain drain pipe characterized in that the mesh tapes of the inner and outer layers are integrally adhered by interposing a strip and melting the synthetic resin strip.