JPS60208508A - Synthetic resin culvert drain tube - Google Patents

Abstract

PURPOSE:To maintain the effects of water absorption and draining for long periods of time by strengthening the pressure resistance of a synthetic resin culvert drain tube by a method in which outer strands and inner strands are connected with flaky connectors in such a way as to form a hollow section in the thick portion. CONSTITUTION:Outer strands arranged in a zigzagged manner on a cylindrical axis within a fixed with W in the circumferential direction are collected to form an outer strand group 2. Inner strands arranged in zigzagged manner with deviation of phase and amplitude direction in relation to the outer strands are also collected to form an inner strand group 3. The groups 2 and 3 are connected by extrusion molding with flaky connectors 4 smaller than the diameter or circumferential width of both the groups 2 and 3 to form a hollow section 5 in the thick portion to obtain a synthetic resin culvert drain 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application This invention relates to a synthetic resin R-beam drainage pipe used for underdrain drainage or field drainage.

(Compared to conventional technology clay pipes and perforated pipes, this underdrain drainage pipe is made of synthetic resin and has a high water supply efficiency and is suitable for preventing clogging. Many strands are integrally formed into a mesh cylindrical shape by extrusion molding. is known (for example, Utility Model Publication No. 57-16901)
(see publication).

In this case, a large number of strands have a cylindrical shape and meander in a direction parallel to the cylindrical axis, or an outer strand group winding in a spiral shape, and a coaxial cylindrical group inside this outer strand group and a substantially cross direction. Inner strand groups oriented in the same manner as above were formed directly at their intersections by integral fusion during extrusion molding.

However, in the above configuration, the outer strand group and the land group to the inner layer 1 are simply fused directly on the outer surface of the curved cross-section, so there is a problem that the pressure resistance is still not strong enough. there were.

(c) Purpose of the invention This invention was made in view of these circumstances,
One of its main purposes is to improve the water supply and drainage effect by forming a double-walled hollow in the thick cross section, as well as to form a fin that protrudes between the outer strand group and the inner strand group. By the strip member i! To provide an underdrain drain pipe whose pressure resistance is significantly strengthened by coating.

(D) Structure of the Invention This invention provides a synthetic resin underdrain drainage pipe in which a large number of strands are extruded into an integral mesh cylindrical shape.
5, an outer strand group in which a large number of strands are cylindrical and wind in a meandering manner in a direction parallel to the cylindrical axis; The inner strands are oriented and are thinner than the side body widths of both of these strands, and protrude from each side body of one strand toward the other strand group, and their protruding edges extend from each side body of the other strand group. This is a synthetic resin underdrain drain pipe consisting of a group of fin-shaped connecting strips that are integrally fused together during extrusion molding.

(e) Examples The present invention will be described in detail below based on examples shown in the drawings. Note that this invention is not limited to this.

Figures 1 to 5 show an embodiment of the present invention, in which a synthetic resin underdrain drain pipe (1) has an outer strand group (
21, (21... and inner strand group (3), (
3)... and a fin-like connecting strip (4) that connects both of these strand groups.

As the material for the underdrain drain pipe (1), thermoplastic resins such as polyvinyl chloride, polyethylene, and polypropylene can be used, but among these, polyethylene is particularly suitable. A diameter of 200 mm is desirable from the viewpoint of extrusion molding and use. ゛Outer strand group (21, (21...... is a circle within a constant width in the circumferential direction < W, as shown in Figure 1) The outer strands (2) meander around the cylindrical axis on the circumference, and the inner strand groups (3), (3)... are the outer strand groups (2), (21... ... and a set of inner strands (3) that meander with deviations in phase and amplitude directions.

Outer strand +21 and inner strand (3) are the second
As shown in Figure <8) (b), fin-like connecting strips (4) smaller than their diameter or circumferential width dimension
), and a hollow part (5) larger than each opening in the outer and inner surfaces is formed within the wall thickness.

The outer strand +21 and the inner strand (3) have a diameter or width of approximately 1 to 5 m, and the openings on the outer and inner surfaces are approximately I MIX I I, excluding the width of each strand (2) and (3).
It is formed to have a size of about 1 to 511 x 5 Il 1 m.

By the way, the underdrain drain pipe (1) having the above structure can be manufactured by C extrusion molding as follows.

That is, an annular outlip member (6) having a required number of rectangular grooves ('7) formed on the inner surface as shown in FIG. 3 is fixed to the tip of an extruder (not shown), and this outlip Inside the member (6), there are diametrical fin forming grooves (9) and circular nozzle holes (t) at positions facing each notch groove (7).
The in-lip member (8) formed with is attached so as to be slidable and rotatable, and while the in-rip member (8) is repeatedly slid in the left and right direction, the in-lip member (8) is melted from both lip members (6) and (8). All you have to do is extrude the synthetic resin. At this time, the molten resin extruded from the circular nozzle opening (G) of the in-rip member (8) is meandered in a waveform by the repeated sliding movement of the in-rip member (8), and the molten resin extruded from the out-rip member (6) The resin is rotated in the sliding direction by the molten resin extruded from the fin-forming groove (9) of the in-lip member (8) and meandered in the same waveform, thereby obtaining a predetermined structure. .

However, with this structure, a rectangular notch groove (7) is formed in the in-lip member (8) and fixed to the extruder, and a fin-forming groove (9) and a circular nozzle hole are formed in the out-lip member (61). Even when □□ is provided and repeated sliding motion is performed, it can be formed in the same manner as described above (see FIG. 4).

In addition, in each of the above manufacturing methods, the case where either the outlip member (6) or the inrip member (8) is fixed to the extruder has been described, but the outrip member (
Both lip members (6) and (8) are provided with a fin forming groove (9) and a circular nozzle hole [10] as shown in Fig. 5. With repeated sliding scoops in the opposite direction, an underdrain drain pipe (1) of similar construction to that described above can be obtained.

When the underdrain drain pipe (1) is configured as described above, the outer strand (2) and the inner strand (3) are reliably connected by the fin-like connecting strip (4), and the inner strand (2) and the inner strand (3) are reliably connected to each other by the fin-like connecting strip (4). , since it is possible to form a hollow part (5) larger than the opening formed on both the inner and outer surfaces, the underdrain drain pipe (1)
It is possible to significantly increase the pressure resistance of the pipe compared to the conventional case, prevent clogging, and maintain high water absorption and drainage effects over a long period of time.

(F) Effects of the Invention This invention provides an underdrain drainage pipe in which a mesh is formed by extrusion of an outer strand group and an inner strand group, in which the outer strand group and the inner strand group are fused together by fin-like connecting strips. Therefore, it is possible to significantly increase pressure resistance, prevent clogging, and maintain high water absorption and drainage effects over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
) (b) is a longitudinal sectional view of the same, and FIGS. 3 to 5 are front views showing the structures of different lip members used to make the underdrain drainage pipe of the present invention. (1), (1a
), (1b)...Synthetic resin underdrain drain pipe, (21, (2a, (2b)...Outer strand, (3), (3a), (3b)... ...Inner strand, (4)...Fin-shaped connecting strip. Fig. 1 Fig. 3 Fig. 4 Fig. 5 Fig. 2 (G)

Claims (1)

[Scope of Claims] 1. In a synthetic resin underdrain drain pipe in which a large number of strands are extruded into an integral mesh cylindrical shape, the large number of strands are cylindrical, and the direction parallel to the cylindrical axis An outer strand group that is wound in a meandering manner, an inner strand group that is coaxially cylindrical inside the outer strand group, and is oriented in a substantially cross direction; , a group of fin-shaped connecting strips that protrude from each side body of one strand toward the other strand group, and whose protruding edges are integrally fused to each side body of the other strand group during extrusion molding. Synthetic resin underdrain drain pipe consisting of.