JPH0443673Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Field of industrial application] This invention relates to water piping that is buried underground, and more specifically, to water piping that is mainly made of soft pipes made of synthetic resin. Regarding the structure of the bent pipe section.

[Prior Art] As shown in FIG. 3, a bent pipe section of a water pipe usually has a socket 20a at one end, and a bent pipe section 2 in the middle.
A bent pipe 20 made of cast iron is used, which has an insertion port 20c at the other end via 0b. According to this, there is no problem in terms of strength, but due to the deformation of the soft straight pipe part 21 connected to it due to the earth pressure p, a gap 22 is created between it and the socket part 20a, and water leaks from the connection part. Furthermore, there are drawbacks such as a mold is required during molding, which increases manufacturing costs.

In contrast, in recent years, bent pipes made of synthetic resin are being used. According to this, there is an advantage that the deformation of the bent pipe section can be followed and water leakage from the connecting section can be prevented as much as possible. However, this also requires a mold for molding, making it expensive to manufacture.

[The problem that the idea attempts to solve]

Therefore, in view of the above circumstances, the present invention has been developed to provide a bent pipe for soft pipes that can well follow the deformation of soft pipes such as synthetic resin pipes, does not create gaps, and can reduce manufacturing costs. The purpose is to provide the following (technical issue).

B. Structure of the invention [Means for solving the problem] The bent pipe for soft pipes of the present invention adopts the following structure (technical means) in order to achieve the above object. That is, it consists of a sleeve pipe part made of synthetic resin and a bent pipe part made of metal, and the sleeve pipe part has a collar protruding from the middle part of the inner periphery, and one end of the sleeve pipe part is connected to the insertion hole of the soft pipe through the collar. The other end is formed into a receptacle part having flexibility to fit the part in a watertight manner, and the other end is fixedly integrated with the bent pipe part with an adhesive. The curved pipe part is formed to have a desired curvature by butt welding a plurality of metal straight pipes.

[Effect]

When an external force such as earth pressure acts on the bent part of the soft pipe system, the insertion end of the soft pipe system that is inserted into the end socket deforms, but the end socket also undergoes this deformation. without creating any gaps in this connection.
Therefore, there is no water leakage.

Moreover, the intermediate socket part and the bent pipe part inserted into the intermediate socket part are integral, and both have rigidity to resist earth pressure, and there is no possibility of slipping out at this part.

Furthermore, since the other end of the bent pipe part is inserted into the socket of the soft pipe system, there is little deformation, and
Being made of metal, it resists deformation.

[Example] Hereinafter, an example of the bent pipe for soft pipes of the present invention will be described based on the drawings.

An example of this is shown in FIG.

This bent pipe H includes a sleeve pipe part 1 made of synthetic resin and a bent pipe part 2 made of metal.

A collar 3 is formed protruding from the inner periphery near the center of the sleeve tube portion 1, and two socket portions, namely an end socket portion 4 and an intermediate socket portion 6, are formed with the collar 3 in between.

The end receptacle 4 is formed at one end of the sleeve pipe 1, into which the receptacle I of synthetic resin piping is inserted. A packing accommodation recess 4a that bulges outward in the radial direction is formed in the end socket 4 in the circumferential direction, and an annular packing 5 is installed in this recess 4a to maintain a watertight connection with the insertion opening I. Plan.

Note that this socket portion 4 has a relatively thin wall thickness and has flexibility.

The intermediate socket part 6 is formed at the other end of the sleeve pipe part 1, and receives one end of a bent pipe part 2, which will be described later. An annular groove is formed on the inner periphery of the intermediate socket portion 6, and a water stop ring 7 made of an elastic body is attached to this groove.

This intermediate socket portion 6 is formed to have a large wall thickness so as to be able to resist deformation.

The bent pipe section 2 is integrally formed by butt welding 13 a straight pipe 10, 11 at both ends and a plurality of intermediate straight pipes 12 (four in this embodiment).

The straight pipe 10 is fitted into the intermediate socket part 6 of the sleeve pipe part 1, made watertight with a water stop ring 7, and fixed and integrated with an adhesive 14 filled in the gap between the two parts.

The straight pipe 11 is inserted into the socket J of another synthetic resin pipe.

The plurality of straight pipes 12 have their end faces cut obliquely toward the center of curvature O, and are butt welded to obtain a radius R and a bending angle θ as a whole.

This bent pipe portion 2 is usually formed of a steel pipe.

In creating this bent pipe H, the sleeve pipe part 1 is formed by a mold, and the bent pipe part 2 is formed by forming a plurality of straight pipes 1.
0, 11, and 12 are welded, and the straight pipe 10 at the end of the bent pipe part 2 is connected to the intermediate socket part 6 of the sleeve pipe part 1.
After fitting and inserting it into the holder, it is fixed and integrated with adhesive 14 and finished.

This bent pipe H describes the deformation effect on earth pressure.

FIG. 2 shows the state of the end socket 4 when it is deformed. That is, when receiving an external force p such as earth pressure, the insertion part I and the end socket part 4 of the main bent pipe 1 have sufficient flexibility because they are both made of soft materials, and the end socket part The portion 4 deforms following the deformation of the insertion port I, and no gap is created between the two. As a result, there is no water leakage from this connection.

C. Effects of the invention Since the bent pipe for soft pipes of the invention has the above-mentioned configuration and functions, it has the following unique effects.

It can respond well to the deformation that occurs in the soft pipe due to the action of earth pressure, and water leakage does not occur.

The sleeve tube portion and the bent tube portion are integrated, and a bent tube with high strength can be obtained.

As for forming, only a mold is required for the sleeve pipe, and no special mold is required for the curved pipe section, just combining multiple straight pipes as appropriate and butt-welding them, making it easy to manufacture. Yes, and the manufacturing cost is low.

The curved pipe section can have a free curvature by using a plurality of straight pipes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of an embodiment of the bent tube for soft pipes of the present invention, and FIG. 2 is a view showing its operating state. FIG. 3 is a sectional view of a conventional bent pipe. H...Bent pipe, 1...Sleeve pipe part, 2...Bent pipe part, 4...End socket part, 6...Intermediate socket part, 1
0, 11, 12... straight pipe.

Claims (1)

[Claims for Utility Model Registration] Consisting of a synthetic resin sleeve pipe part and a metal bent pipe part, the sleeve pipe part has a flange protruding from the middle part of the inner periphery, and one end can be opened through the flange. is formed at an end socket part having flexibility to fit the insertion part of the soft pipe in a watertight manner, and at the other end, one end of the bent pipe part is fitted in a watertight manner,
An intermediate socket is formed that is fixedly integrated with the bent pipe part using an adhesive and maintains rigidity, and the bent pipe part is formed into a desired curvature by butt welding a plurality of straight metal pipes. A curved pipe for a soft pipe, characterized in that: