JPH0434283A - Drain pipe - Google Patents

Abstract

PURPOSE:To form an air core all the time in the center of a pipe so as to contrive reduction of noise with no blinding by forming an inner side shape of a pipe section, cut in a direction orthogonal to a pipe axis, into polygon and its top part into a helical shape. CONSTITUTION:A drain pipe 1 shapes its section, cut in a direction orthogonal to an axis of the pipe, into a polygonal ring and also twists gradually in the pipe axial direction so as to form a helicoid. Each polygonal top part 2 in an internal side of the pipe is chamfered respectively in a curved surface shape. Material of the drain pipe 1 is synthetic resin of polyvinyl chloride, polyethylene, polybutene, polypropylene, etc, and these fiber reinforced resin and cast iron or the like. As a result, drain water is collected in the vicinity of the polygonal top part of the section in the pipe and allowed to flow down helically along the top part, and blinding of the drain pipe is eliminated without stopping dust, fiber chip, etc., contained in drain water, while forming an air core in the center of the pipe.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a drain pipe that is mainly used as a solid drain pipe in high-rise buildings such as buildings and condominiums.

[Conventional technology]

When a large amount of wastewater flows down the hard drainage pipe of a building,
- Because the pipe becomes blocked from time to time, the air layer inside the hard drainage pipe no longer flows between the upper and lower sides. Moreover, as the waste water flows downward, its speed increases, and a jumping phenomenon occurs at the bent portion of the drain pipe at the lowest level, causing the pipe to become temporarily blocked. Therefore, there was a problem in that the inside of the drainage vertical pipe became negative pressure, the water seal of the trap of the branch pipe connected to this drainage vertical pipe became unsealed, and the bad odor inside the drainage vertical pipe flowed back into each room. Therefore, as a rigid pipe for drainage in high-rise buildings such as buildings and condominiums, FR2
A drainage pipe in which a spiral groove or a rib is formed on the inner circumferential surface of the pipe as seen in Japanese Patent No. 251673 (French patent) has been proposed. In this drain pipe, the spiral groove or rib allows the waste water to flow down in a spiral along the wall surface of the pipe, so that an air core is always formed in the center of the drain pipe to prevent the pipe from being blocked.

[Problem to be solved by the invention]

However, in a pipe with projections such as ribs formed on the inner surface of the pipe as described above, there is a risk that dust or fiber debris in the drainage water may get caught and accumulate on the ribs or other projections, causing clogging. When drainage water directly hits protrusions such as ribs, an impact sound is generated, which can cause noise problems. Furthermore, since it is necessary to provide complicated spiral ribs and grooves on the inner surface of the tube, manufacturing is not easy and there are also problems in terms of manufacturing cost. In view of the above circumstances, the present invention allows wastewater to flow down in a spiral pattern in a stable manner, constantly forming an air core in the center of the pipe, without clogging, generating less noise, and moreover, can be manufactured at low cost. It is intended to provide drainage pipes.

[Means to solve the problem]

In order to achieve the above object, the first invention provides that at least the inner shape of the tube cross section cut in the direction perpendicular to the tube axis is formed into a polygon, and each top of this polygon is formed in the tube axis direction. The gist of the invention is a drainage pipe characterized by being formed to draw a spiral trajectory, and the second invention is characterized in that the cross section of the pipe cut in a direction perpendicular to the pipe axis has a polygonal ring shape, A synthetic resin inner tube, in which each top of the polygonal ring is formed to trace a spiral trajectory in the tube axis direction, is fitted into a metal outer tube of a desired diameter, and is connected to the outer tube. The gist of the drainage pipe is that the gap formed between the drain pipe and the inner pipe is densely filled with foamed resin.

[For production]

With the above configuration, when the drain pipe according to the first invention is used as a solid drain pipe, the waste water flows down in a spiral manner along the spiral structure of the inner wall surface of the pipe. Therefore, an air core is always formed in the center of the tube. Moreover, since there are no protrusions in the middle of the pipe, dust, fiber debris, etc. contained in the drainage water flow down with the drainage water without getting caught. Furthermore, it can be manufactured by extrusion molding using an extrusion molding machine in the same manner as an extrusion molded tube, and at the same time gradually rotating it in the circumferential direction and taking it off. When the drain pipe according to the second invention is used as a rigid pipe for drainage, the waste water flows down in a spiral along the spiral structure of the inner wall surface of the pipe, similarly to the drain pipe according to the first invention. Therefore, an air core is always formed in the center of the tube. Moreover, since there are no protrusions in the middle of the pipe, dust, fiber debris, etc. contained in the drainage water flow down with the drainage water without getting caught. Further, the foamed resin layer filled between the outer tube and the inner tube and the outer tube can absorb the sound of falling objects inside the inner tube, thereby preventing leakage to the outside of the tube. Furthermore, the inner tube can be manufactured by extrusion molding as usual with an extrusion molding machine and at the same time gradually rotating it in the circumferential direction and taking it off. The inner tube can be held in the center of the outer tube by contacting the inner wall surface of the tube. Moreover, during manufacturing, normally the foamed resin raw material is applied to the surface of the inner tube and then inserted into the outer tube and heated to foam the foamed resin. Since the ridgeline turns in a spiral, if the resin raw material is dripped from above while rotating the inner tube in the circumferential direction, the resin raw material will be distributed over the entire inner tube surface along the part between the ridgelines. It is applied so that it spreads evenly.

【Example】

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIGS. 1 and 2 show a drain pipe according to the first invention. As shown in the figure, this drain pipe 1 has a polygonal ring shape (hexagonal in the figure) in cross section cut perpendicular to the pipe axis, and gradually twists toward the pipe axis. It is twisted to form a spiral. Furthermore, the polygonal number tops 2 on the inside of the tube are each chamfered into a curved surface. The material of this drain pipe 1 is not particularly limited, but includes synthetic resins such as polyvinyl chloride, polyethylene, polybutene, and polypropylene, fiber-reinforced resins thereof, cast iron, and the like. The number of angles of the polygon is not particularly limited, but in order to moderate the speed of downward drainage and to prevent the jumping phenomenon, approximately 4 to 6 angles is appropriate. When this drainage pipe 1 is used as a rigid drainage pipe, the drainage water flows down while spirally turning along the spirally twisted inner wall surface of the pipe, especially along the polygonal top 2 parts, so it is difficult to avoid conventional spiral ribs. As with drain pipes with grooves, an air core can always be formed in the center of the pipe. Moreover, since there are no protrusions on the inner wall surface of the pipe, solid matter such as dust and fiber waste mixed in the drainage water will not get caught and cause clogging. Of course, the drainage water will not hit the protrusions and cause noise. Moreover, since each of the polygonal apexes 2 on the inside of the tube has a curved shape as if chamfered, the accumulation of solid matter (slime), etc. can be further reduced. Note that the twist angle can be arbitrarily changed depending on the take-up speed during manufacturing, etc., but it is particularly preferable to set it to about 45°. Furthermore, this drain pipe 1 can be easily molded by extruding the pipe using a normal extrusion molding machine and pulling it out while rotating it in the circumferential direction at a desired rotational speed. It also has the advantage that it can be manufactured without requiring any equipment or equipment, and can be provided at low cost. Note that the drain pipe according to the present invention is not limited to the above embodiments. For example, in the above embodiment, the cross-sectional shape was a polygonal ring shape on both the inside and outside, but it is sufficient to make only the inside of the tube a polygonal shape. That is, the outer peripheral shape of the tube may be circular. 3 and 4 show a drain pipe according to the second invention. As shown in the figure, this drain pipe 4 is what is called a lining pipe, and the drain pipe 1 made of synthetic resin as shown in Fig. 1 is fitted into an outer pipe 6 made of metal as an inner pipe 5. The space between the outer tube 6 and the inner tube 5 is filled with foamed resin 7. Therefore, when this drain pipe 4 is used as a rigid pipe for drainage, the waste water flows down while spiraling along the spirally twisted inner wall surface of the pipe, similar to the drain pipe 1 of the first invention. As with conventional drain pipes with spiral ribs and grooves, an air core can always be formed in the center of the pipe. Moreover,
Since there are no protrusions on the inner wall of the pipe, solid matter such as dust and fibers mixed in the drainage water will not get caught and cause clogging. Furthermore, the inner tube 5, which directly pours liquid into the wastewater, is made of synthetic resin, and has excellent corrosion resistance against acids and alkalis in the wastewater flowing inside the tube, and the outer tube 6 is made of metal, making it fireproof. It will also be possible to install it in buildings that require structure. Furthermore, since the drainage sound is absorbed by the foamed resin 7 and the metal pipe 6, there is also the effect that the leakage of drainage sound to the outside is reduced compared to a drainage pipe made of only metal or synthetic resin. In particular, if a filler with a large specific gravity such as silica sand is mixed into the foamed resin raw material for forming the foamed resin 7, the sound insulation effect can be further enhanced. In addition, the conventional manufacturing method for lining tubes involves forming ribs of a predetermined height in the axial direction of the outer wall surface of the inner tube so that the inner tube is held at uniform intervals when inserted into the outer tube. In addition to providing multiple tubes, the foamed resin raw material is dripped from above while rotating the inner tube to apply the foamed resin raw material to the entire surface of the inner tube, the inner tube is inserted into the outer tube, and then heated. The foamed resin raw material is foamed to form a dense layer of foamed resin between the inner tube and the outer tube, but in the conventional method,
Since the ribs are provided along the axial direction, the ribs become an obstacle and make it difficult to uniformly apply the foamed resin raw material. However, in the drain pipe according to the present invention, both the inside and outside of the inner pipe 4 have a polygonal cross section and are twisted spirally, so as shown in FIG. 8 and the ridge line 8 is the foamed resin raw material 9.
If the inner tube 5 is rotated while dripping, the ridge line 8
The foamed resin raw material 9 flows over the entire surface of the inner tube 5 along the area surrounded by the ridge lines 8 and can be applied uniformly. Moreover, since the ridge line 8 formed by the top of the polygon functions as a conventional rib, there is no need to create a rib.

【Effect of the invention】

The drain pipes according to the first invention and the second invention are constructed as described above, and when used as a solid drainage pipe, the drainage water collects near the top of the polygon formed in the cross section inside the pipe. As the water flows down in a spiral pattern, an air core is always formed in the center of the pipe, and since there are no protrusions in the middle of the pipe, dust and fibers contained in the waste water will not get caught. Eliminates clogged drain pipes. In addition, the tube can be easily formed by extruding it using a regular extrusion machine and then rotating it in the circumferential direction at the desired rotational speed while taking it out, which eliminates the need for complicated molds and equipment. It also has the advantage of being able to be manufactured without any problems and provided at low cost. Furthermore, in the drain pipe according to the second invention, the inner pipe that is in direct contact with the waste water is made of synthetic resin, and has excellent corrosion resistance against acids and alkalis in the waste water flowing inside the pipe, and the outer pipe is made of synthetic resin. Since it is made of metal, it can also be installed in buildings that require fireproof construction. Furthermore, since the drainage sound is absorbed by the foamed resin and the metal pipe, there is also the effect that the leakage of drainage sound to the outside is reduced compared to a drainage pipe made of only metal or synthetic resin. Furthermore, since the foamed resin raw material can be applied easily and uniformly, a foamed resin layer with a uniform thickness can be easily formed.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the drain pipe according to the first invention, Fig. 2 is a sectional view thereof, and Fig. 3 is a perspective view of an embodiment of the drain pipe according to the second invention. FIG. 4 is a perspective view, FIG. 4 is a sectional view thereof, and FIG. 5 is an explanatory diagram illustrating a method of applying foamed resin to the inner tube. 1, 4...Drain pipe 2...Top 5...Inner pipe
6... Outer tube 7... Foamed resin

Claims (2)

[Claims] (1) At least the inner shape of the cross section of the tube cut in the direction perpendicular to the tube axis is formed into a polygon, and each top of this polygon is formed so as to draw a spiral trajectory in the direction of the tube axis. A drain pipe characterized by: (2) A synthetic resin whose tube cross section cut in the direction perpendicular to the tube axis has a polygonal ring shape, and each top of this polygonal ring is formed to draw a spiral trajectory in the tube axis direction. A drainage system characterized in that an inner pipe is fitted into a metal outer pipe of a desired diameter, and a gap formed between the outer pipe and the inner pipe is densely filled with foamed resin. tube.