JPS59161508A - Synthetic resin netted tube - Google Patents

Abstract

PURPOSE:To provide a sufficient strength against external pressures for a synthetic resin netted tube by using small amounts of resin by providing a mechanism by which external pressures are received by a pressure-resistant action possessed by the resin thickness of a spiral resin belt wall and a pressure-resistant action of air possessed by the follow portion of the resin belt wall. CONSTITUTION:Large numbers of hollows 4 having an enclosed space structure surrounded by inner and outer walls 51 and the almost radially directed wall portion of a pile connecting inner and outer walls 51 or a thick circumferential wall 52 having the almost radially directed wall portion of the tube are provided in the longitudinal direction. Large numbers of openings are formed in the outside or inside circumferences of spiral resin belts 2 wound at adequate intervals by crossing large numbers of parallel linear resin belts 3 or linear resin lines at intervals in the axisial direction of the resin belts 2 and combining them integrally at crossed points. In the main skeleton having the resin belts 2 in a tubular form, in case where external pressures apply to the synthetic resin netted tube 1, the external pressures are received synergistically by a pressure-resistant action by the resin thick in the almost radially directed portion of the tube in the circumferential wall 52 and a pressure-resistant action of air embraced in the hollows 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin reticular tube that has excellent strength against external pressure and uses only a small amount of resin, and is particularly effective at removing excess moisture contained in soil. It is effective when applied to underdrain drain pipes that are often used for drainage purposes.

Conventionally, the synthetic resin reticular tube described in Publication No. 5-169'o1 of 1973 was used as a synthetic resin reticular tube that had a strong external pressure resistance even though it was lightweight with a relatively small amount of resin used. There is a type of pipe that is widely available on the market.

This net-like pipe constitutes the main frame,
Because the spiral resin strip is thin-walled with a high cross-sectional thickness, it exhibits a special upward slope effect compared to other net-shaped pipes. However, even with this net-like pipe, the demand for increased pressure resistance = increased resin usage = high cost cannot be avoided. There was a strong voice that they wanted something strong.

In view of the above, it is an object of the present invention to provide a synthetic resin reticular tube that uses a small amount of resin but has sufficient strength against external pressure.

The feature is that the spiral resin part that constitutes the main frame of the synthetic resin mesh tube ρ is formed by a number of hollow parts of independent closed space structures surrounded by walls with appropriate thickness, and the outer periphery of this spiral part or A large number of parallel straight resin parts are arranged on the inner periphery and intersect with each other in the axial direction of the spiral part, and the intersecting parts are integrally welded to form a mesh opening. It attempts to absorb external pressure through the pressure-resistant effect of the wall's resin thickness and the pressure-resistant effect of the air inside the closed space held by the many hollow parts.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. In Figure 5, ``Y'' is a thermoplastic synthetic resin such as polyethylene or polyvinyl chloride, or #! is used for this thermoplastic synthetic resin. It is a synthetic resin reticular tube formed by mixing fiber reinforcing materials, etc., and is wound around the inner periphery of one or more (two in the figure) spiral resin bands 2 at appropriate intervals. , parallel linear resin bands 3 are connected to the spiral resin band 2.
The intersecting points intersect at intervals in the axial direction, and the intersecting points are integrally welded to form a large number of mesh-like openings.

This spiral resin band 2 is shown in Fig. 3 (A) (+=)
As shown in K, it is composed of a wall 5 having an appropriate thickness and a hollow part 4 having an independent closed space structure surrounded by a pile wall 5. There are no plans to set one up.

The wall 5 consists of an inner wall facing the inside of the tube, an outer wall facing the outside of the tube, and a substantially radial wall portion of the tube connecting the inner and outer walls 51, or a substantially radial wall portion of the tube. (In the part where the inner and outer walls 51 and the peripheral wall 52 are integrated, there may be a boundary depending on the molding method, but there is no particular boundary. Therefore, the space between the hollow parts 4 and 4 is partitioned by a fairly thick wall in which the inner and outer walls 51 and the peripheral wall 52 are integrated and are relatively close to each other.), depending on the use and conditions. In order to cope with the external pressure that comes, the number of hollow parts 4, the size of the hollow part 40, the thickness of the wall 5, the hardness and softness of the material used, etc. are changed dramatically, but in order to increase the strength, It is also possible that the circumferential wall 52 is not partially but entirely formed by the substantially radial wall section of the tube, and that the thickness of the substantially radial wall section of the tube is particularly moderated. Error) Subject to consideration.

In other words, regarding the latter, the circumferential thickness of the part that partitions the hollow parts 4 of the peripheral wall 52 or the hollow parts 4 of the peripheral wall 52
Increasing the thickness of the side spiral resin band 2 in the width direction, or both, increases the strength against external pressure. It is preferable that the thickness is at least approximately half to more than the radial thickness. Also, the shape of the hollow part 4 is not particularly limited, and it tends to be irregular and unspecified, especially when molded by foam molding. Even in this case, at least a part of the peripheral wall 52 regulating the shape of the hollow portion 4 becomes a wall portion in the substantially radial direction of the tube. It has parts.

In the above embodiment, an example was shown in which the linear resin band 3 was intersected and integrated on the inner circumference of the spiral resin band 2, but conversely, the linear resin band 3 was intersected and integrated on the outer circumference of the spiral resin band 2. They may be integrated, and the linear resin band itself is not limited to a band shape, but may be a simple resin strip. In addition, in the embodiment, the hollow portion 4 has a plurality of holes (
Although a large number of resin bands are provided, there is only one in the width direction of the spiral resin band 2. However, a plurality of hollow parts 4 may also be provided in the width direction (not shown), in which case there may be a peripheral wall that partially shares the wall, an inner/outer wall, and an intermediate wall other than the peripheral wall. However, the basic idea is the same as in the previous embodiment.

Next, instead of adopting such a configuration for the entire circumferential direction of the synthetic resin reticular tube 1, a linear resin band 3 and a wide membrane are used for a part of the circumferential direction as shown in FIG. 4(A). vr6
The wide membrane band 6 integrated with the α-linear resin band 3 is also integrated in the axial direction of the spiral resin band 2 to form a mesh-like part. A structure in which a part of the opening is closed in the axial direction may be used to stabilize the flow path during drainage.

In addition, as shown in FIG. 4(b), the linear resin band 3 and the wide membrane band 6 are moved together to integrate the nine axial directions of the spiral resin band 2, thereby bringing out the effect of tilting. You can do it like this.

As described above, the present invention provides a thick-walled periphery made of the inner and outer walls 51 and a substantially radial wall portion of a tube connecting the inner and outer walls 5, or having a substantially radial wall portion of the tube. Since the spiral resin band 2, which has a hollow part 4 with an independent closed space structure surrounded by 52 and is arranged in multiple stages in the longitudinal direction and is wound at appropriate intervals, constitutes the main frame in the form of a tube, the synthetic resin When external pressure is applied to the reticular tube 1, the pressure resistance effect due to the resin thickness in the wall 5, especially the peripheral wall 52, in the approximately radial direction wall portion of the tube;
Since the pressure-resistant effect of the air pressure contained in the hollow part 4 of the independent closed space structure surrounded by the wall 5 and K synergistically receive external pressure, it has a strong resistance to external pressure compared to the amount of resin used. It is something that exists.

In order to further increase the strength against external pressure, measures are taken to reduce the number of hollow parts 4, reduce the size of the hollow parts 4, and increase the thickness of the walls 5. However, as mentioned above, the thickness of the substantially radial wall portion of the tube is specially adjusted so that the circumferential wall 52 is formed not only partially but entirely by the generally radial wall portion of the tube. Moreover, if this thickness is made to be at least approximately half or more than the approximately radial thickness of the portion where the inner and outer walls 51 and the peripheral wall 52 are integrated, the thickness of the hollow portion 4 can be simply increased. The purpose of the present invention can be achieved much more efficiently than when considering the increase/decrease, the size, the thickness of the wall 5, etc. In other words, Zhou P! The reason why it is preferable that F52 is formed entirely by the generally radial wall portion of the tube rather than partially is because if the peripheral wall 52 does not have such a configuration, when external pressure is applied, Peripheral wall 5
2 acts in the direction of collapse and weakens the strength of the tube.Also, the thickness of the wall portion in the approximately radial direction of the tube is approximately The reason why it is preferable to set the thickness to at least about half of the radial thickness or more is because from a mechanical standpoint, if the thickness is less than about half, not only will the stiffness become weak, but also external pressure from a slightly different direction will be applied. This is because it also acts in the direction in which the peripheral wall 52 collapses.

Furthermore, even when the synthetic resin reticular tube 1 is cut into appropriate lengths and used on site, only a small portion of the hollow section 4 becomes unsealed due to cutting, and its pressure-resistant function is almost impossible. Since it does not reduce the effect, it can be used without any problems.

Furthermore, the spiral resin band 2 is different from the case where the resin band itself is simply annular; one or more spirals are chained together to prevent external pressure from being applied, so it is given more resistance. In addition, the linear resin bands 3 or linear resin strips connecting the spiral resin bands 2 necessary to form the mesh-like openings extend over the entire circumference of the spiral resin bands 2. Because of the crossing and joining, the structure as a synthetic resin reticular tube can withstand both spiral and straight lines, not only against external pressure from the circumferential direction, but also against external pressure such as tension and compression from the axial direction. The synergistic effect of the two configurations has the effect of maintaining sufficient drag.

Next, a wide film is formed integrally with the linear resin band 3 or the linear resin strip on a part of the circumferential direction of the synthetic resin net v1.
6, or by moving the linear resin band 3 or the linear resin strip and the wide membrane band 6 together so that they intersect and integrate in the axial direction of the spiral resin band 2, a mesh opening can be formed. It has a structure in which a part of the drain is closed in the axial direction, thereby making it possible to stabilize the flow path during drainage.

As listed above, the independent closed space structure is surrounded by the inner and outer walls 51 and the thick peripheral wall 52 which is made of the substantially radial wall portion of the tube connecting the inner and outer walls 51 or has the substantially radial wall portion of the tube. The structure is formed by combining a spiral resin band 2 with a large number of hollow parts 4 extending in the longitudinal direction, and a linear resin band 3 or a linear resin strip integrated with the spiral resin band 2, and a wall 5, especially a peripheral wall. Since external pressure is synergistically received by the resin thickness of 52 mm and the pressure resistance effect of the air contained in the hollow part 4, it is possible to efficiently impart the strength against external pressure required to a synthetic resin reticular tube with a small amount of resin. be.

Furthermore, when forming the linear resin band 3 from a soft material as necessary, the synthetic resin reticular tube 1 can be bent freely, and the desired curved shape can be formed without requiring any particular bending process. Because of this, it is possible to bury it in a meandering manner and use it in a curved manner without requiring any additional members.

Furthermore, when connecting the synthetic resin reticular tube 1, for example, a relatively large diameter synthetic resin reticular tube 1 having a spiral resin band 2 on the inner periphery is connected to a relatively small diameter synthetic resin reticular tube 1 having a spiral resin band 2 on the outer periphery. It is also possible to immediately connect them by threaded joints using the tortoise-spiral resin bands by applying a mesh-like synthetic resin tube.

The synthetic resin mesh pipe of the present invention, which has many of the advantages mentioned above, can be used not only as an underdrain drainage pipe, but also as a liquid drainage filtration member, packaging material, fishery materials, etc. .

[Brief explanation of the drawing]

The drawings show an example of the synthetic resin iR reticular tube according to the present invention, and FIG. 1 is a side view explaining the tube form, and FIG.
Fig. 3 is an enlarged cross-sectional view of the main part of the holder, illustrating the manner in which the hollow part is formed and the manner in which the spiral resin band and the colinear resin band are connected. is an enlarged cross-sectional view of the main part taken along the line A-A in Figure 1, and Figure 3 (B) is an enlarged sectional view of the main part taken along the line A-A in Figure 1.
An enlarged sectional view of the main part taken along the line, and FIGS. 4A and 4B are views in the direction of arrows corresponding to FIG. 2, showing another embodiment. DESCRIPTION OF SYMBOLS 1...Synthetic resin mesh tube, 2...Spiral resin band, 3...Straight resin band, 4...Hollow part, 5...
Wall, 5 U...Inner and outer walls, 52...Peripheral wall, 6...Wide membrane belt. Special RR Applicant: Seisaku Nippon Sha Co., Ltd.

Claims (2)

[Claims] (1) A hollow part of an independent closed space structure surrounded by inner and outer walls and a thick peripheral wall that is larger than or has a substantially radial wall part of the pipe connecting the inner and outer walls is longitudinal. Parallel linear resin bands or linear resin strips are placed on the outer periphery or inner periphery of a spiral-shaped resin band wound in multiple stages at appropriate intervals in the direction, respectively, at intervals in the axial direction of the spiral-shaped resin band. A synthetic resin reticular tube formed by placing a large number of pipes and intersecting each other, and the crossing points are integrally welded and connected to form a large number of openings. (2) The hollow part of the independent closed space structure surrounded by the inner and outer walls and the thick peripheral wall made of the substantially radial wall portion of the tube connecting the inner and outer walls or having the substantially radial wall portion of the tube extends in the longitudinal direction. On the outer periphery or inner periphery of a spiral-shaped resin band wound in multiple stages at appropriate intervals, parallel linear resin bands or linear resin strips are respectively arranged at intervals in the axial direction of the spiral-shaped resin band. In a synthetic resin reticular tube formed by placing a plurality of pipes and intersecting each other and integrally welding and bonding the crossing points to form a large number of openings, the circumferential direction of the linear resin band or linear resin strip is A synthetic resin net formed by integrating a wide membrane band integrally with a part, or a linear resin band, or a linear resin strip and a wide membrane band, intersecting in the axial direction. tube.