JPS6017893B2 - culvert drain pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel synthetic resin underdrain drain pipe.

Since culvert drainage pipes receive large soil loads, they must have excellent soil strength to prevent them from collapsing.However, as shown in Figure 3, a large number of small permeable holes b are drilled into an extremely thick pipe a. When a general underdrain drain pipe having the above-mentioned structure is manufactured from synthetic resin, a large amount of resin is required, which is extremely disadvantageous from an economical and resource saving perspective.

Not only that, but drain pipes with such a structure are naturally limited in water permeability, since the pressure resistance strength decreases when excessive water permeability holes are drilled, and therefore, the water absorption efficiency is also unsatisfactory. there were. Focusing on this point, various synthetic resin underdrain drain pipes have been developed recently, but the reality is that there are hardly any that are fully satisfactory. The present invention
In view of the current situation, we offer synthetic resin underdrain drainage pipes that use a relatively small amount of resin, yet have thick pipe walls, high soil resistance, and are excellent in water absorption efficiency. This is a system in which a plurality of extremely thick frame rings made of synthetic resin are spaced almost coaxially through a plurality of crosslinked synthetic resin threads, and a large number of frames running in the direction of the ball are attached to the outer periphery of the ring. This invention relates to an underdrain drainage pipe whose gist is formed by fusing synthetic resin threads to form a pipe wall equipped with a water-permeable membrane. Hereinafter, the underdrain drain pipe of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partial longitudinal cross-sectional view of an embodiment of the present invention, and FIG. This is an extra-thick frame ring made of 2 to 3 times more foamed material), and the ring 1... is an average-sized cross-linked thread 2 made of the same synthetic resin that is integrally cross-linked with these.
They are spaced apart coaxially at approximately constant intervals via...

These rings 1... have an irregular cross-sectional shape that approximates an oval shape that is slightly elongated in the diameter direction. Such ring 1・
There are no particular restrictions on the thickness and mutual spacing of the rings 2, etc., and the thickness and number of the crosslinking threads 2. The thickness of the long axis is about 0.7 to 2.0 mm, and the mutual spacing is about 0.5 to 2.0 mm. In addition to setting the cross-linked yarn 2 to
The thickness of ... is about 0.3 to 1.0, and the number is about 3 to 1.0.
It is appropriate to set the number to about IZ. A large number of relatively thin synthetic resin threads 3 running in the mari direction are attached to the outer periphery of such a thick frame ring 1, and these threads 3 and the crosslinked threads 2 . . forms a double-structured pipe wall 5 that is provided with water-permeable membranes 4 everywhere that are sufficient to prevent the passage of earth and sand particles.

In this embodiment, by irregularly bending the threads 2, more water permeable membranes 4 are formed than when the threads are provided linearly, thereby increasing the water permeability rate. Although a moderate improvement is intended, it is of course possible to provide the threads 3 in a straight line. This is because even if the drain pipe is installed linearly in this manner, a drain pipe with a higher water permeability ratio than the conventional drain pipe as shown in FIG. 3 can be obtained. The thread 3 may be made of the same hard synthetic resin as the frame ring 1 or the crosslinked thread 2, or other semi-hard or relatively soft synthetic resin. However, from the viewpoint of increasing the impact strength of the tube wall 5, semi-hard or relatively soft synthetic resin threads that have excellent tensile strength and impact absorption properties are more suitable. In addition, there are no particular restrictions on the thickness or number of new threads 3..., but for example, if the outer diameter is 10~1&
In order to obtain an underdrain drain pipe of the same size, it is appropriate to set the diameter of the threads 3 to about 0.1 to 0.3 mm and the number of threads to about 50 to 150. Further, in this embodiment, such threads 3 are provided in a single layer around the outer circumference of the frame ring 1, but a large number of threads may be provided depending on the case. In addition, 6 in the figure is a film-like material made of synthetic resin, which is used to reduce the roughness coefficient of the inner surface of the pipe wall 5 so that the water absorbed into the drain pipe can flow smoothly.
It was later attached to the water surface on the inside of the drain pipe,
Of course, it is also possible to make the water surface of the drain pipe smooth by other means, and such a film-like material 6 is not indispensable.

Such an underdrain drainage pipe is produced by, for example, continuously extruding synthetic resin crosslinked yarns 2 as warp yarns from an extrusion die, and intermittently extruding extra-thick frame rings 1 as weft yarns. Simultaneously with the extrusion molding of rings 1 and 1, threads 3 on the surface of the tube wall 5 are continuously extruded from the outer periphery of the same die as warp threads to form rings 1 and 1.
It is obtained by attaching kudzu to the outer periphery of ... and taking it off while cooling and solidifying. In this case, if the take-up speed is slower than the extrusion speed, the threads 3 will become a curved drainage pipe as in the embodiment, and if the speed is constant, the threads 3 will become a straight drainage pipe. In the underdrain drain pipe of the present invention having the above structure, the extremely thick frame rings 1...
・Thread 3 fused to the outer periphery of ・ and inner cross-linked yarn 2 ・・
・A double-structure tube wall 5 is formed by and supported by the very thick ring 1... Compared to synthetic resin drainage pipes, it has a high soil resistance strength that is comparable to that of synthetic resin drainage pipes, and it also enables considerable savings in the amount of resin used.

Such an effect can be achieved by using the extremely thick frame ring 1 as shown in the example.
This becomes even more noticeable when the cross-sectional shape approximates an oval shape that is slightly elongated in the caliber direction. Incidentally, when the surface threads 3 are made of a semi-hard or relatively soft synthetic resin as described above, there is an advantage that the impact resistance strength is greatly improved. In addition, when the pipe wall 5 is formed of the threads 3 and the crosslinked threads 2 as in the drain pipe of the present invention, all the mutual gaps between these threads become the water-permeable membrane 4. The water permeability ratio is improved compared to the one with small holes in the middle.
Moreover, water that has entered the water-permeable membrane 4 between the threads 3 on the surface side of the pipe 5 is attracted to the water-permeable membrane 4 between the threads 3 and the crosslinked threads 2. Since it quickly penetrates into the pipe, the water absorption efficiency is extremely high. Such an effect is
This becomes even more noticeable when the water permeability is increased by bending the threads 3 on the surface as in the embodiment. In addition, as in the previously described embodiments, the film-like material 6...
If the surface of the flowing water is made smooth by means such as mixing water on the surface of the flowing water, there is an advantage that the absorbed water flows smoothly. As described above, the underdrain drainage pipe of the present invention uses a small amount of resin, yet has high soil resistance, high water permeability, and extremely high water absorption efficiency, making it useful.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial longitudinal cross-sectional view of an embodiment of the underdrain drain pipe of the present invention, Fig. 2 is a cross-sectional view of the same embodiment, and Fig. 3 is a partial perspective view of a secondary underdrain drain pipe. It is.

(Explanation of symbols in drawings) 1... Extra thick frame ring, 2
...Crosslinked thread, 3... Thread, 4... Water-permeable membrane, 5...
Kankaku, 6...Film.

Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A plurality of extremely thick frame rings made of synthetic resin are spaced apart almost coaxially via a plurality of crosslinked synthetic resin threads, and
An underdrain drainage pipe formed by fusing a large number of synthetic resin threads running in the axial direction to the outer circumference of the ring to form a pipe wall with a water permeable gap.