JPH03187410A - Underdrainage pipe and manufacture thereof - Google Patents

Abstract

PURPOSE:To smoothly collect the water permeating into the ground in the inside of a pipe by separating the spiral ridge part or the spiral bottom part by a small space part along the entire length, and in the small space part, by forming a large number of water-passing small holes communicated with the inside of the pipe. CONSTITUTION:The spiral ridge part 2 or the spiral bottom part 3 of a synthetic resin spiral pipe body 1 is separated by a give small space part 4 in the spriral direction along the entire length. And in the small space part 4, a connecting piece 5 whose both end parts are fixed to the opposite end parts of the separated ridge parts 2a, 2b or the separated bottom parts 3a, 3b is provided in the spiral direction for each small space part, and a large number of small water- passing holes 6 communicated with the inside of the pipe are formed in the small space parts 4. When the underdrainage pipe is embedded in the ground, a large pressure-resisting strength can be obtained by the spiral ridge parts 2 projected on the outer circumference, and also the water permeating into the ground through a large number of water-passing holes 6 can be efficiently collected in the inside of the pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synthetic resin underdrain drainage pipe buried underground in golf courses, wetlands, and other places, and a method for manufacturing the pipe.

[Conventional technology]

Conventionally, as an underdrain drainage pipe, for example,
As described in Japanese Patent No. 206, a tape-like net is wound spirally so that the side edges of the net overlap one another to form a resin tube, and a nonwoven fabric is placed between the overlapping portions of the net in the resin tube. Alternatively, a structure is known in which a filter made of glass fiber or other woven fabric is compressed and reinforcing strips are helically fused and fixed to the inner and outer peripheries of a resin tube.

In addition, a spiral tube is formed from a relatively hard synthetic resin material,
A drainage pipe has also been developed in which a large number of water holes are formed in the peaks or valleys of the spiral pipe.

[The problem that the idea aims to solve]

However, the former type of underdrain drainage pipe made of tape-like net has extremely low pressure resistance, making it difficult to bury it in the ground where it is subject to large earth pressure.Also, its relatively small diameter makes it inefficient. The problem is that a good water collection cannot be obtained.

On the other hand, the latter drainage pipe made of synthetic resin pipe can be formed with a relatively large diameter and can improve drainage efficiency, but it has many holes drilled in the peaks or valleys. Since the water holes are provided after the spiral pipe is manufactured, a water hole drilling device is required separately from the manufacturing equipment for the spiral pipe, which not only increases the scale of the equipment, but also makes it difficult to Alternatively, it is technically difficult to accurately drill water holes in the valley at regular intervals in the spiral direction, and there is a problem that uniform drainage performance cannot be obtained due to variations in the intervals and hole diameters. there were.

Furthermore 1. Not only is there a risk of cracks occurring during drilling, but as mentioned above, the uneven arrangement of the water holes makes it impossible to obtain uniform pressure resistance over the entire area, and when used underground. There was a risk that local cracks would occur due to earth pressure.

The object of the present invention is to provide a synthetic resin underdrain drain pipe and a method for manufacturing the drain pipe that can solve these problems.

[Means to solve the problem]

In order to achieve the above object distantly, the underdrain drainage pipe of the present invention has a spiral valley part or a spiral crest part of a synthetic resin spiral pipe body separated in the spiral direction by a certain small interval part,
Connecting pieces whose ends are fixed to opposite ends of the separation valley or peak are provided at small intervals in the spiral direction in this small space, thereby forming a large number of small water passage holes that communicate with the inside of the pipe in the small space. It has the following structure.

In addition, as a manufacturing method for such an underdrain drainage pipe, a semi-molten pipe is formed in which a valley or a peak is formed in the center and horizontal ears are formed at both ends of both side walls of the valley or peak. The belt-shaped synthetic resin material is placed on the molding rotation shaft while providing a certain small interval between the ear of the belt-shaped synthetic resin material part to be wound first and the ear part of the belt-shaped synthetic resin material part to be wound next. While winding it in a spiral, synthetic resin connecting pieces are integrally fixed at small intervals in the spiral direction between the opposing ears in the small spaced portions to connect the opposing ears on the spiral troughs or peaks. In addition, a large number of small water passage holes are formed at small intervals.

[For production]

When this synthetic resin pipe is buried underground, it not only maintains the desired pressure resistance due to its spiral crests, but also drains the mud through the numerous small water holes provided in the spiral crests or spiral troughs. Water that permeates into the ground, such as soil, clay, or gravel, can flow into the pipe and be discharged to the outside.

Since the water passage holes are provided at regular small intervals in the spiral direction in the helical crests or valleys of the pipe, all the water passage holes are uniformly arranged, and therefore, It exhibits uniform water permeability over the entire circumference of the pipe, does not form weak parts on the pipe wall, has uniform strength throughout, and is able to withstand large earth pressures. can.

In addition, such a synthetic resin pipe having a large number of small holes for water passage is produced by placing a belt-shaped synthetic resin material in a semi-molten state with valleys or peaks in the center on a molding rotation shaft between opposing ends. The tube is manufactured by winding the tube in a spiral shape with certain small intervals, and then connecting and integrating the small interval parts in the spiral direction at small intervals with synthetic resin connecting pieces. At the same time, a large number of water passage holes can be provided, and the size, shape, pitch, etc. of the water passage holes can be adjusted accurately depending on the wrapping interval of the band-shaped synthetic resin material and the size, shape, and spacing of the synthetic resin connecting pieces. Moreover, it can be easily set, and a highly accurate underdrain drain pipe can be manufactured efficiently.

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings. (1) is mainly composed of a helical tube made of synthetic resin such as polyethylene, and the helical ridge portion (2
) and a spiral valley portion (3) are formed continuously in the length direction via vertical side wall portions (8) and (9).

In this spiral tube main body (1), as shown in Fig. 1.2, a separation gap (4) of a constant width is provided at the center of the top surface of the spiral crest (2) over the entire length in the spiral direction. The spiral ridge portion (2) is formed between the left and right separation ridge portions (2a) and (2b) through this separation gap portion (4), and the spiral ridge portion (2) is formed between the separation ridge portions (2a) and (2b). are connected and integrated at fixed small intervals in the spiral direction by connecting pieces (5) made of synthetic resin such as polyethylene, and the opposite end surfaces of the separating peaks (2a) and (2b) and the connecting pieces are connected in the separation gap (4). (5) (5) A large number of water passage holes (6) (6)... (6) of the same shape and size that communicate with the inside of the pipe through gaps are provided at regular intervals in the spiral direction. be.

In addition, Fig. 3.4 shows that a separation gap (4) of a constant width is provided in the center of the spiral valley (3) over the entire length in the spiral direction, and the spiral valley (3) is connected to the left and right separation valleys. The separation valleys (3a) and (3b) are connected and integrated at fixed small intervals in the spiral direction by synthetic resin connecting pieces (5) in the same manner as described above. , the opposite end surfaces of the separation valley portions (3a) (3b) and the connecting piece (5) in the separation gap portion (4).
(5) A large number of small water passage holes (6) (6) (6) of the same shape and size communicating with the inside of the pipe through gaps are provided at regular intervals in the spiral direction.

In addition, when providing the water passage small hole (6) in the spiral valley part (3) in this way, as shown in FIG.
The inner ends of both side wall portions (8) and (9) that extend from the spiral valley portion (3) to the spiral valley portion (3) are connected by a band material (7) made of the same synthetic resin to close the hollow interior of the peak portion (2). This strip material (7) can be continuous on substantially the same plane as the inner surface of the trough to enable smooth drainage.

The separation gap portion (
In the above figure, the connecting piece (5) forming a large number of small water passage holes (6) in the spiral direction in 4) is a narrow band-shaped synthetic resin connecting member (51) having a certain thickness. The separation peaks (2a) ( 2b) or the separation valley portion (3a) (3b), and its inverted portion is integrally fixed to the surface of the separation valley portion (3a), and these opposing separation peak portions (2a)
(2b) The synthetic resin connecting member (51) that partially closes the separation gap (4) between the gap or valley (3a) (3b)
) forms the connecting piece (5), but the sixth
As shown in the figure, connecting pieces (5) made of small pieces of synthetic resin having a certain shape are arranged at regular small intervals in the spiral direction of the separation gap (4), and both ends of the connecting pieces (5) are By fixing the separation ridges (2a) (2b) or the separation valleys (3a) (3b) on the opposing parts, the separation gap (4) is spirally formed into a large number of small water passage holes (6). May be divided.

Next, in each of the above embodiments, the separation direction of the separation gap (4) is provided in the length direction of the tube, but as shown in FIGS. may be provided.

That is, among the separated spiral valleys (3a) and (3b), the width of one of the separating valleys (3a) is slightly increased, and the side edge of the separating valley (3a) is connected to the opposite separating valley. The connecting piece (5) is superposed and integrated on the part (3b) via the connecting piece (5).
The small interval corresponding to the thickness of is used as the separation gap (4a), and the connecting pieces (5) (5) are provided at regular small intervals.
A small water passage hole (6) is formed between the holes.

Similar to the above embodiment, this connecting piece (5) is made by integrally fixing the reversed part of a narrow band-shaped synthetic resin connecting member (51) having a certain thickness to the opposing separation peaks or valleys. However, it may be formed by arranging it in a zigzag shape in a spiral direction (Fig. 7), or as shown in Fig. 8, a connecting piece (5) made of a small piece of synthetic resin having a certain shape is used. separation valleys (3a) (3b) with their front and back surfaces facing each other.
) by integrally fixing the separation gap (4a)
may be divided into a large number of small water passage holes (6) in a spiral direction.

When the former narrow band-shaped synthetic resin connecting member (51) is provided, an inverted portion of the connecting member (51) bends toward the inside of the pipe from the edge of the separation valley (3b) disposed inside. (51
a) is made to protrude from the edge of the separation valley (3b), and the irregularly shaped gap surrounded by the protruding inverted portion (51a) and the edge of the separation valley (3b) is formed into a small water passage hole ( 6).

In addition, in FIGS. 7 and 8 above, the valley (3) is separated and the valley has a separation gap (4a) and a small water passage hole (
6), but in the same way for the mountain part (2),
By overlapping and connecting the separation peaks (2a) and (2b) through the connection piece (5), a separation gap (4a) that opens in the length direction of the tube is provided, and a large number of small holes (6) are formed. It is something that can be done.

Next, a method for manufacturing the underdrain drain pipe described in each of the above embodiments will be described.

As a manufacturing apparatus for carrying out this method, a known manufacturing apparatus can be used. For example, as shown in FIG. Multiple axes (12a) (12a)...(12a
) to configure the rotation axis θ force for molding, and these axes (
One end of 12a) is rotatably supported by the machine frame 0'7) and configured so that it can be rotated all at once in the same direction via an appropriate rotational drive mechanism (not shown). .

In addition, these multiple shafts (12a) constituting the molding rotation shaft 02) have both ends supported by the shaft (11) located at the center via the link θ side, and this link 090 ship is By rotating the shaft 01) as a fulcrum through an appropriate mechanism, the molding rotation axis a'! The diameter of J may be configured to expand or contract according to the diameter of the synthetic resin spiral pipe (underdrain drainage pipe) (1) to be formed, and the molding rotation shaft 02) may be configured to be Alternatively, it may be formed of a shaft body having a large number of rotating rollers arranged in parallel in the winding direction on its surface.

For example, in order to manufacture an underdrain drainage pipe (1) having a large number of water passage holes (6) in the spiral valley (3) using such a device, polyethylene resin is injected from the resin extrusion molding nozzle 09. While extruding a semi-molten band-shaped synthetic resin material 00) made of polyolefin-based hard synthetic resin such as polypropylene resin and having a constant width, the material is spirally wound around a molding rotation shaft 021.

At this time, the belt-shaped synthetic resin material 01l) is moved by the nozzle 05) to the peak (2) and the side walls (8) (9) of the peak (2).
) has an ear (31) of a constant width that projects horizontally from the edge of the
(32), and on the molding rotation shaft 021, one edge (31) of the band-shaped synthetic resin material 00) to be wound first and the band-shaped band to be wound next. The synthetic resin material 0ω is spirally wound so that there is a certain small interval between the other ears (32) to form a separation gap (4), and the opposite ears that are in contact with the molding rotation axis a are formed. (31) Separated valley (3a) by (32)
(3b) is formed.

In this way, the belt-shaped synthetic resin material 00) is placed on the molding rotation axis Q2).
is spirally wound through a certain separation gap (4) to form a spiral peak (2) and a separated spiral valley (3), and this belt-shaped synthetic resin material 00) is uncured. In this state, a narrow band-shaped connecting member (51) having a certain thickness made of the same synthetic resin material is extruded from the extrusion molding nozzle 0Ω in a zigzag shape, or while being formed in a zigzag shape during supply, the trough portion (3 ), the opposing separation valleys (3a) and (3b) are fused and integrated at regular small intervals on both sides of the reversed portions (51b) and (51c), respectively, to form a separation gap portion (4). is partitioned at regular intervals in the spiral direction by a connecting piece (5), which is a part of the connecting piece (5), and a large number of small water passage holes (
6).

When such a small water passage hole (6) is provided in the peak part (2), both side walls (8 ) (9) Using a nozzle that forms horizontal ears of a constant width that become the separation peaks (2a) (2b), mold in the same manner as above while leaving a small gap between the opposing ears. What is necessary is just to wind it spirally on the rotating shaft 0, and to integrally connect between ear parts by the said connection member (51).

In addition, the separation peak (2a) (
In order to provide a large number of small water passage holes (6) in the separation gap (4) while connecting the space between the two or the separation valleys (3a) and (3b), it is necessary to connect the holes at an appropriate position above the molding rotation axis 02). A feeding mechanism (not shown) for the piece (5) is provided, and the molding rotation shaft 02
Between the separation peaks (2a) (2b) or the separation valleys (3a) of the belt-shaped synthetic resin material Oω wound spirally on 1
(3b) Connecting pieces (5) may be supplied and fixed at regular intervals between them.

In the above manufacturing method, the separation gap (
The band-shaped synthetic resin material Q (D) was wound spirally on the molding rotation shaft 021 so that 4) was formed. Molding the belt-shaped synthetic resin material a while polymerizing the rotating shaft 0
21 in a spiral manner, and at the time of winding, the connecting member (51) or single connecting piece (5) is attached to the horizontal ear portion (31) (
32) is supplied and interposed between the opposing surfaces at regular intervals,
The ears (31) and (32) are integrally connected by welding the connecting member (51) or a single connecting piece (5), and are open in the length direction of the tube as shown in FIGS. 7 and 8. A separation cavity (4) having a large number of small water passage holes (6) is formed.

Note that from the nozzle 05), a band-shaped synthetic resin material 0ffl with peaks, valleys, ears, etc. formed is wound around the molding rotation shaft 02), but from the nozzle 05), a flat band-shaped synthetic resin material with a constant width is wound. is extruded, and while forming peaks, troughs, ears, etc. on the molding rotation shaft 02) using an appropriate molding method, the rotation shaft 02)
2) It may be wound on top.

〔Effect of the invention〕

As described above, according to the underdrain drainage pipe of the present invention, the spiral valley or spiral crest of the synthetic resin spiral pipe main body is separated in the spiral direction over the entire length by a certain small interval. A structure in which connecting pieces are provided at small intervals in the spiral direction, both ends of which are fixed to opposite ends of the separation valley or peak, and a large number of small water passage holes communicating with the inside of the pipe are formed in the small intervals. Therefore, when this underdrain drainage pipe is buried underground, it can exhibit great pressure resistance due to the spiral peaks protruding from its outer periphery, and the spiral peaks or valleys Water that has permeated into the ground can be smoothly collected into the pipe through the large number of water passage holes provided in the pipe.

Furthermore, since the water passage holes are provided at regular small intervals in the spiral direction in the helical crests or valleys of the pipe, all the water passage holes are arranged uniformly, and therefore the pipe It exhibits uniform water permeability over the entire circumference, has no weak parts in the pipe wall, has uniform strength throughout, and can sufficiently withstand large earth pressures.

In addition, a method for manufacturing such a synthetic resin pipe having a large number of water passage holes is such that a valley or peak is formed in the center, and both ends of both side walls of the valley or peak are formed into horizontal ears. The belt-shaped synthetic resin material in a semi-molten state formed on the molding rotation shaft is wound between the ear of the belt-shaped synthetic resin material part to be wound first and the ear part of the belt-shaped synthetic resin material part to be wound next. The spiral troughs or ridges are wound spirally with certain small intervals, and synthetic resin connecting pieces are integrally fixed at small intervals in the spiral direction between the opposing ears in the small interval parts. This feature is characterized by connecting the opposing ears of the pipe and forming a large number of small water passage holes at small intervals, so it is easy to construct a relatively large diameter underdrain drain pipe depending on the diameter of the molding rotation shaft. In addition, many small water holes can be created during the pipe manufacturing process, simplifying the entire device compared to the conventional method of drilling water holes after the pipe is manufactured. Not only that, but also small water passage holes can be easily formed.

Furthermore, the size, shape, pitch, etc. of the small water passage holes can be easily changed depending on the wrapping interval of the band-shaped synthetic resin material and the size, shape, and interval of the synthetic resin connecting pieces, and the size, shape, and pitch of the small water passage holes can be easily changed, and the size, shape, and pitch of the small water passage holes can be easily changed depending on the wrapping interval of the band-shaped synthetic resin material and the size, shape, and interval of the synthetic resin connecting pieces. It is possible to accurately and easily obtain small water passage holes in the shape, and to efficiently manufacture underdrain drain pipes with high precision.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a simplified side view of an underdrain drainage pipe with small water passage holes in the mountain portion, Fig. 2 is an enlarged perspective view of a partially sectional view, and Fig. 3 The figure is a simplified side view of an underdrain drain pipe with small water holes in the valley, Figure 4 is an enlarged perspective view with a part of it in section, and Figure 5 is an underdrain drain pipe with a flat inner surface. Fig. 6 is a partially cross-sectional perspective view of an underdrain drainage pipe with a small water passage formed through a single connecting piece, and Figs. 7 and 8 show the length of the pipe. A partially cross-sectional perspective view of an underdrain drainage pipe having a small water passage opening in the direction,
FIG. 9 is a simplified side view of the entire apparatus for explaining the manufacturing method. (1)...Synthetic resin spiral tube body, (2)...crest, (2a) (2b)...separation peak, (3)...trough, (3a) (3b) ...Separation valley, (4)...
Separation gap, (5)... Connecting piece, (6)... Small water passage hole, 0ω... Band-shaped synthetic resin material, Q21... Molding rotation shaft, (31) (32)... Ears. 1 Screwing (main peak 4: 'yr, 4t wait smell J meeting 6 ministry 6, 17 to 1 hole N to 5 now to 6 to 2 official counterfeit ≧ ≧ be Shoki) to 44 et al.N Niki N Shinobu

Claims (2)

[Claims] (1) The spiral troughs or helical crests of the synthetic resin spiral tube body are separated in the helical direction over the entire length by certain small interval parts, and both ends are separated at small intervals in the spiral direction in this small interval part. An underdrain drainage pipe characterized in that a connecting piece is fixed to the opposite end of the separation valley part or the peak part, and a large number of small water passage holes communicating with the inside of the pipe are formed in the small spaced part. (2) A belt-shaped synthetic resin material in a semi-molten state with a valley or a peak formed in the center and horizontal ears at both ends of both side walls of the valley or peak is placed on a molding rotation shaft. , the winding is carried out in a spiral while providing a certain small interval between the ear part of the band-shaped synthetic resin material part to be wound first and the ear part of the band-shaped synthetic resin part to be wound next, and the said small interval. Synthetic resin connecting pieces are integrally fixed at small intervals in the helical direction between opposing ears in the helical troughs or peaks, and a large number of small water passages are connected between the opposing ears in the spiral troughs or peaks. A method for manufacturing an underdrain drainage pipe, characterized by forming holes.