JPS59210114A - Synthetic resin reticular structure tube - Google Patents

Abstract

PURPOSE:To obtain a culvert tube of reticular structure using small amounts of a synthetic resin and having a great strength by forming the mesh of the reticular tube by integrally bonding a large number of nearly crossed linear resin belts to the bottom of a spiral resin strip having an approx. triangular or trapezoidal cross section with a recession on its one side. CONSTITUTION:A thermoplastic resin strip 2 having a nearly triangular or trapezoidal cross section with a recession 8 on one 5 of its sides and also with an expanded slope 6 on the other 6 of its sides is formed. The resin strip 2 is spirally rolled, a large number of resin belts 3 are set on the inner surfaces of the resin strip 2 in such a way as to nearly cross them with the spiral resin strip 2, and the bottom 7 of the spiral resin strip 2 is bonded inte-rally to the linear resin belts 3 to form a synthetic resin netted tube 1 with the mesh 4. A culvert reticular tube having a great strength to external forces can thus be obtained by using small amounts of the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin reticular pipe used as an underdrain drainage pipe or the like.

An object of the present invention is to provide a lightweight synthetic resin reticular tube that has high strength against external pressure and uses a small amount of resin. Another object of the present invention is to provide a synthetic resin mesh pipe suitable for use as an underdrain drainage pipe, etc., which is designed to collect and drain excess water contained in the soil very efficiently.

Traditionally, wastewater from reclaimed land, reclaimed land, polder land, rice paddies, fields, etc.
Various types of drainage pipes are buried underground to collect and drain underground water, such as culvert drainage and underground drainage from orchards, drainage from golf courses and sports fields, and drainage from road and railway tracks. In addition, synthetic resin reticular tubes used for this type of purpose are also widely available.

However, conventional synthetic resin mesh tubes, which are simply formed by transitioning a flat net into a tubular shape, have the disadvantage of extremely low strength against external pressure, and therefore are difficult to handle in order to cope with various external pressures. It is necessary to increase the thickness of the resin strips that make up the net, and to reduce the number of meshes as much as possible, or to make the meshes as small as possible.As a result, the cost is proportionally increased due to increased consumption of material f- and increase in ii. I couldn't avoid the high. In addition, when the mesh size is small or small, the collection and drainage function is insufficient.In order to improve this problem, heat treatment is applied to the outer or inner periphery of the spiral resin strip made of thermoplastic resin. A synthetic resin mesh tube is swept, in which a large number of parallel linear resin strips made of plastic resin intersect in the axial direction of the spiral resin strip, and the crossing points are integrally welded and bonded to form a mesh. However, even with this synthetic resin reticular tube, it is impossible to deviate from the equation of increasing pressure resistance and increasing the amount of resin used = higher cost. There was a strong desire for something that was inexpensive and had high pressure resistance.

On the other hand, synthetic resin mesh pipes, like other collection and drainage pipes, are required to have a higher water collection function and to be adaptable to an increase in flow rate during drainage, but for the former, simply increasing the mesh size or increasing the number of meshes is required. If the mesh pipes are increased in number, the above-mentioned strength problems will occur, and the hydrophobic materials and covering materials such as chestnut stone, crushed stones, and rice husks buried around the mesh pipes will clog the mesh pipes, and There was a risk that the material would fall and accumulate, reducing its functionality. Furthermore, if the hydrophobic material or covering material and the reticular pipe are in close contact with each other and there are insufficient voids, the water flow path is likely to be cut off and the water collection function is reduced.

Regarding the latter, the spiral resin strips that are glued and integrated onto the inner periphery of straight resin strips, which are widely available these days, have a roughness coefficient because the spiral resin strip itself acts as a resistance to water flow. In the past, when the flow rate was high, there was a defect that the flow rate decreased.

The present invention has been made in view of the above, and embodiments of the present invention will be described below with reference to FIG.

In the figure, 1 is a synthetic resin reticular tube formed by mixing a thermoplastic synthetic resin such as polyethylene, polyvinyl chloride, etc. or a fiber reinforcing material with a thermoplastic synthetic resin. On the inner periphery of the spiral resin strips 2 (preferably one or two) wound at appropriate intervals, parallel linear resin strips 3 are arranged on the inner circumference of the spiral resin strips 2.
A large number of meshes 4 intersect with each other at intervals in the axial direction, and the intersecting points are integrally welded and bonded to form a large number of mesh 4-shaped openings.

As shown in FIGS. 3 and 4, the cross section of this spiral resin strip 2 is a substantially triangular shape that is biased to one side with respect to the bottom portion 7 that is integrated with the linear resin strip 3. The side surface 5 has a substantially trapezoidal shape approximating a triangular shape, and the biased side surface 5 is concave with a slight depression 8, and the other side surface 6 extends from the grain 4 to the outside of the reticular tube 1. It has an expanded sloped surface. The degree of deviation of the spiral resin strip 2 is preferably such that the angle formed between the spiral resin strip 2 and the linear resin strip 3 on the side surface 5 side which is deflected is about 90 degrees. Further, it is preferable that the biased side surface 5 is formed with a depression 8 so as to have a slight bulge 9.9' above and below it, and an upper bulge 9 is particularly preferable. Furthermore, it is preferable that the height of the spiral resin strip 2 is set to about 1 to 2 degrees relative to the length of the bottom side 7 of its cross section.

In the embodiment described above, the spiral resin strip 2 and the linear resin strip 3 are intersected and integrated, but as shown in FIG. 5, a thin linear resin strip 3 is used instead of the linear resin strip 3.
Rather than making the entire circumferential area of the reticulated tube unit such a structure, a part of the reticular tube unit is bent by straight resin strips 3 as shown in FIG. 6. The base portion may be covered with a wide linear resin band 32, or other suitable measures may be taken.

The spiral resin strip 2 having the above-mentioned structure is formed by extrusion molding to form the resin strip into such a shape from the beginning, and then winding it around a straight resin strip 3, which is also formed by extrusion molding, while both retain heat of fusion. There is also a method of molding by integrating the
Alternatively, the spiral resin strip 2 of the present invention can also be obtained by cutting a tubular body formed by extrusion with a cutter while taking it in the extrusion direction. In other words, for example, when the structure of a cutter is such that one side of the tip of the cutter has an inclined surface and the other side has a slight bulge in the area adjacent to the tip of the cutter, the inclined surface of one side of the cutter makes the other side side 6
However, due to the other side of the cutter having a slight bulge, a biased side surface 5 having a bulge 9.9' is formed simultaneously with the depression 8, so that the bulge 9.9' is not formed. If this is the case, make a recess (indentation) above and below the part of the cutter that has small legs. The spiral resin strip 2 thus formed is integrated with a linear resin strip 3 which is extruded in parallel with the tubular body to obtain a synthetic resin reticular tube 1. The synthetic resin reticular tube of the present invention may be formed by other suitable means.

As described above, in the present invention, the substantially triangular-shaped gear biased toward the negative side has a substantially trapezoidal cross section that is close to a substantially triangular shape, and the side surface 5 on the biased side has a slight recess 8. The other side 6 is a concave inclined surface extending from the mesh 4 to the outside of the mesh tube 1, and is a straight line parallel to the inner periphery of the spiral resin strip 2 wound at appropriate intervals. A mesh 4 is formed by having a large number of resin strips 3 or linear resin strips 31, 32 intersect at intervals in the axial direction of the spiral resin strip 2, and the intersection points are integrally welded and connected. Therefore, it has the following effects.

(1) The stone action effect against external pressure due to the combination of the spiral resin strip 2 and the linear resin strip 3 is similar to that of the conventional one, but in the present invention, the cross section of the spiral resin strip 2 forming the main body frame is Since the approximately triangular shape is approximately trapezoidal, which approximates the approximately triangular shape, for example, in the case of approximately triangular shape, simply speaking, the amount of resin in the spiral resin strip 2 is approximately half, and some of the surplus resin is By trying to strengthen the spiral resin strip 2 by allocating all of it to the portion corresponding to the base and height of the triangle, it was possible to provide a mesh tube 1 with excellent strength. In the case of a substantially trapezoidal shape approximating a substantially triangular shape, the reticular tube 1 can be obtained which has a strong pressure resistance compared to the amount of resin used, although it is not half as effective.

(2) Spiral resin strip 2 that supports the main skeleton of the reticular tube 1
is preferably formed by one or two helices, that is, a double helix or a double helix.
In case of spiral formation (9) The pitch of each spiral becomes quite gentle, which eliminates the problem of weakening the strength.

(3) The cross section of the spiral resin strip 2 is
The straight resin has a substantially triangular shape or a substantially trapezoidal shape approximating a substantially triangular shape, which is biased to one side with respect to the base 7 portion that is integrated with the base 7, and the straight resin on the side surface 5 side where the culm of the bias is biased. When setting the angle with respect to the strip 3 to be around 90 degrees, for example, if it is biased to 120 degrees or 130 degrees, the center of gravity will move outside the range around the bottom, and the strength against external pressure will be weak. It has been resolved.

(4) The biased side surface 5 of the spiral resin strip 2,
When the depression 8 is formed so as to have a slight bulge 9.9' above and below it, the pressure resistance of the spiral resin strip 2 is reinforced by the bulge 9.9'. In particular, reinforcing the upper thin wall portion by the bulge 9 is effective.

(5) When the height of the spiral resin strip 2 is set to a height of about 1 to 2 degrees relative to the length of the bottom edge of the cross section, the strength of the spiral resin strip 20 is more effectively exhibited. .

(6) Moisture contained in the soil is extracted from the mesh tube 1 through the mesh 4 formed by the spiral resin strips 2 and the straight resin strips 3.
At this time, the cross section of the spiral resin strip 2 has a substantially trapezoidal shape, which is deviated by 1@lFc from the bottom 7 of the spiral resin strip 2, and has a substantially triangular shape. In addition, since the other side surface 6 is a widening inclined surface extending from the mesh @ 4 to the outside of the mesh tube 1, the biased side surface 5 is relatively water-resistant due to its bias. The other side 6 does not act as a resistance for the flow path, while the other side surface 6 acts as a resistance for the flow path to some extent, but since it is sloped linearly toward the mesh 4, it does not act as a resistance for the flow path. In addition, the sloping surface of the shingle is an expanding slope that expands from the mesh 4 to the outside of the pipe, and water can be collected from a wider area relatively quickly from the stones, so it is a mesh-like surface. This improves the water collection function of the pipe 1.

Therefore, since the mesh 4 itself may be relatively small, the pitch of the spiral can be narrowed, thereby further increasing the pressure resistance of the mesh tube against external pressure.

(7) Slight depression 8 in the cross section of the spiral resin strip 2
, the water flow path increases and the water collection function is improved by creating more wall gaps between the hydrophobic material and coating material buried between the parts of the decomposed IP1. However, in the present invention, the recess 8 is provided on the biased side surface 5 of the spiral resin strip 2 with a substantially trapezoidal cross section having a substantially triangular shape or a substantially triangular shape. From A, for example, when a 4111-sided triangular depression is provided, the depression 8 itself acts as a resistor for the water flow path, which prevents the water collection function from being degraded. .

(8) Since the linear resin strip 3 is integrated with the inner periphery of the spiral resin strip 2, the s Since the coefficient of variation becomes significantly lower, the drainage flow rate of the water collected in the mesh pipe 1 is improved.

(9) When the degree of deviation of the cross section of the spiral resin strip 2 is set to be around 90 degrees as described above, the entire width of the side surface 5 on the side 5 which is biased hardly acts as a resistor in the water flow path. First, compared to the case where the recess 8 is provided in a case where the degree of deflection is small, the l'IrI gap between the hydrophobic material and the coating material can be secured relatively reliably.

(Rotation) Side surface δ of the biased side of the spiral resin strip 2 cross section
When a slight bulge 9 is provided above, the gap between the hydrophobic material and the covering material can be secured relatively reliably, as described above.

Ql) Thin linear resin strip 31 instead of linear resin strip 3
When cross-integrating with the inner periphery of the spiral resin strip 2 to form the mesh tube 1, the mesh tube 1 can be freely bent b,
It can be buried in a meandering manner or used in a curved manner without requiring any additional members. □ When a mesh pipe unit is formed by intersecting and integrating linear resin strips 3 in a part of the circumferential direction of the α-force mesh pipe 1 and wide linear resin bands 32 in other parts, the drainage f1rt's It is possible to stabilize the flow path during the process.

As described above, the present invention provides a synthetic resin reticular pipe suitable for use as an underdrain drainage pipe, etc., which satisfies the demands for strength and functionality of a reticular pipe.

[Brief explanation of the drawing]

The drawings show an example of a synthetic resin reticular tube according to the present invention,
Fig. 1 is a partially cutaway front view, Fig. 2 is a view in the direction of the π arrow in Fig. 1, Fig. 3 is an explanatory diagram of the cross-sectional shape of the spiral resin strip, and Fig. 4 is a cross-sectional view of the spiral resin strip.
The figure is an explanatory view of the cross-sectional shape of another embodiment, and FIGS. 5 and 6 are views showing other embodiments in the direction of the arrow shown in FIG. 2. 1... (Synthetic resin F?i) #-shaped tube, 2... Spiral resin strip, 3... Straight resin strip, 4... Mesh, 5... Offset side surface, 6 ...the other side, 7
...Base, 8...Concave, 9.9'...Bulge, 31
・32...Linear resin band patent applicant Seisaku Nippon Sha Co., Ltd. (14) District 10

Claims (4)

[Claims] (1) On the inner periphery of a spiral resin strip made of thermoplastic resin that is wound at appropriate intervals, parallel linear resin strips or [IF linear resin bands] made of thermoplastic resin are attached.
A cross section of the spiral resin strip of a synthetic resin mesh tube is formed by intersecting a large number of spiral resin strips at intervals in the axial direction, and the intersection points are integrally welded to form a mesh. It has a substantially triangular shape that is biased to one side with respect to the bottom portion that is integrated with the resin strip, and has a substantially trapezoidal shape that approximates a substantially triangular shape, and the side surface of the biased side is slightly offset. A synthetic resin reticular tube with a concave surface and the other side having an expanded sloped surface extending from the mesh to the outer tube edge. (2) The synthetic resin reticular tube according to claim 1, wherein the angle between the spiral resin strip and the straight resin strip on the biased side surface is about 90 degrees. (3) The synthetic resin net soft pipe according to claim 1, wherein the biased side surface of the spiral resin strip has a concave shape with a slight bulge at least upwardly. (4) The synthetic resin reticular tube according to claim 1, wherein the spiral resin strip has a height approximately 1 to 2 times the base of its cross section.