JPH0349350Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The pressure-resistant synthetic resin pipe for underground burial as referred to in the invention is a buried pipe for use by being buried underground, and is used for water pipes, sewage (drainage water), etc. ) This is a tube mainly used as a protective tube for electric wires and telephone lines.

<Conventional technology> Conventionally, concrete-made so-called hume pipes and cast iron pipes have often been used as underground pipes of this type, but these are both heavy and rigid pipes. The workability was extremely poor because it was difficult to make long pieces, and it required a great deal of time and effort to lay it underground. In recent years, a flexible spiral tube made of synthetic resin material has been developed as a new tube that can solve these drawbacks (see Figure 13), but since this synthetic resin tube is long, the number of connections is limited. It is widely used today because it has the advantage of dramatically shortening the amount of work required to bury it underground, as it requires less pipework and is flexible, allowing for curved piping. I'm getting used to it.

<Problem that the invention aims to solve> However, underground pipes need to withstand strong earth pressure, and in order to have pressure resistance,
As shown in FIG. 13, the tube wall 01 was made thick. However, if the pipe wall is made thick, a large amount of synthetic resin material is required for molding, and perhaps because it is not easy to transport or install, it also lacks flexibility, which is the lifeblood of this type of synthetic resin pipe. It had no choice but to become a thing.

Therefore, although the present invention is a synthetic resin pipe, it eliminates the various drawbacks of conventional synthetic resin pipes for underground burial, reduces the amount of synthetic resin material used, and reduces the overall weight. The purpose of the present invention is to obtain a pressure-resistant synthetic resin pipe for underground burial that is lightweight, has excellent pressure resistance, and has excellent flexibility.

<Means for Solving the Problems> The present inventor researched, prototyped, and tested tubes with various structures as synthetic resin tubes capable of achieving this purpose.
In other words, we have developed methods in which metal wires are buried at the top of a spiral waveform, in a valley, and in which multiple metal wires are buried in parallel at the top of a mountain. reached the conclusion that when the structure has a predetermined pressure resistance, the weight of the pipe as a whole cannot be reduced, and the amount of synthetic resin material used cannot be significantly reduced.

The present invention was developed as a result. The technical solution is as follows. That is, it is a synthetic resin pipe with a pipe wall formed in a spiral wave shape, and the pipe wall 1 is formed over a spiral wave-shaped peak part 2 and a part of both side wall parts 3 and 4 that are connected to the peak part 2. , a series of wide and long strips 6 made of thin metal plates are spirally arranged inside the synthetic resin wall forming the pipe wall, and the trough 5 and the side walls are It has a structure in which a flexible zone made only of a synthetic resin material without the above-mentioned strip plate 6 is formed in a part of the sections 3 and 4.

<Operation> In order to bury the pipe constructed in this manner underground, the pipe is laid along a trench excavated to a required depth at the planned pipe site, and the excavated soil is covered thereon. During this piping, the pipe has flexibility due to the presence of a flexible zone made of only synthetic resin material, which is formed across the trough of the spiral waveform and both side walls, so it can be easily installed in an excavated trench. can be aligned with
The reinforcing strips work together with the synthetic resin walls to provide pressure resistance against earth pressure.

<Examples> Examples of the present invention will be described below with reference to the drawings.

1 to 4 are diagrams showing one embodiment of the present invention (hereinafter referred to as the first embodiment), and the spirally corrugated tube shown in FIG. As shown in FIG. 3, the synthetic resin band 9 is sequentially wound spirally while polymerizing both side edge portions, and on the outer circumferential surface of the band 9, a downward-opening cross-sectional shape is formed as shown in FIG. Band A, in which a synthetic resin layer is fused and integrated on the entire outer circumferential surface of a long and wide punched metal reinforcing band plate 6 made of stainless steel plate, is wound in a spiral manner as shown in Fig. 3. Left and right side walls 3, 4
The projecting edges 5a and 5b of the synthetic resin layer projecting laterally outward are overlapped and integrally fused onto the cylindrical inner wall 8. In the case of this embodiment, the reinforcing strip plate 6 has a structure in which the reinforcing strip plate 6 is housed within the synthetic resin wall of the cylindrical inner wall 8 and the synthetic resin layer which is integrally fused onto the outer circumferential surface of the reinforcing strip plate 6.

The embodiment shown in FIG. 5 and FIG.
The shape of the flat band-shaped synthetic resin band 9 in the embodiment is wound on the outer circumferential surface of the band B to be integrated, and the portion corresponding to the U-shaped opening is attached to the thick walled portion 9a protruding toward the outer circumferential direction of the small tube. The band B corresponding to the band A has a structure in which a synthetic resin layer is integrally fused to the entire inner peripheral surface of the reinforcing band plate 6, that is, the reinforcing band plate 6 is attached to the inner and outer synthetic resin devices. The structure was buried in the shape of a sandwich trench in between.

In this embodiment, the synthetic resin band 9 forming the cylindrical inner wall 8 is shown as having a thick wall portion 9a projecting toward the outer circumference, but this thick wall portion 9a is not necessarily necessary. Needless to say, it may be a flat strip shaped as shown in the example.

Although the spirally corrugated pipe shown in the above embodiments is shown as having a cylindrical inner wall, this inner wall is not necessarily in the shape of a right cylinder and may have a somewhat uneven corrugated shape. . However, since the inner wall formed in this way has less resistance to fluid, it is mainly used for water supply and sewage (drainage) pipes. In addition, although the spiral waveform is shown as having a rectangular cross-sectional shape, it is not necessarily intended to be limited to this shape, and it may also be used as a chevron-shaped or wave-shaped spiral waveform as shown in Figures 7 to 9 below. Needless to say, it's a good thing.

Next, an example of a pressure-resistant synthetic resin pipe for buried underground, which is mainly used as a protection pipe for electric wires, telephone lines, etc., will be described.

The embodiment shown in FIGS. 7 and 8 is an embodiment in which the reinforcing strip plate 6 has a semicircular arc-shaped chevron wave cross-sectional shape as shown in FIGS. 5 and 6. As in the case of , the entire inner and outer circumferential surfaces are coated with a synthetic resin layer in a sandwich-like pattern as a band C, and this band C is wound spirally to form lateral outward protruding edges 5a and 5b of the synthetic resin layer. It has a structure in which parts are polymerized and fused. Therefore, unlike the pipes in the embodiments shown in FIGS. 1, 2, and 5, the pipe of this embodiment does not have a tubular inner wall 8 formed on the inner surface of the pipe, and the spaces between the adjacent troughs 5, 5 are corrugated. It is formed into a cavity.

When inserting an electric wire or the like into a tube having such a structure, the electric wire or the like is supported only on the inner peripheral surface of the trough 5, so there is less friction area between the inner surface of the tube and the electric wire, etc.
Not only does it have the advantage of making it easier to insert electric wires, etc., but even if dew condensation occurs inside the pipe, the dew water will accumulate in the ridges below the pipe, so electric wires, etc. (wire sheathing, etc.)
It can be well protected for a long period of time without having to be immersed directly.

In the embodiment shown in FIG. 9, on the inner peripheral wall surface of the valley portion 5 of the pipe in the embodiment shown in FIG. 7,
It has a structure in which protrusions 10a and 10b are formed at positions on the inner peripheral surface of the tube at positions corresponding to the extensions of the inclined walls 3 and 4.

The protrusions 10a and 10b may be formed on the inner circumferential surface of the central portion of the trough 5.

By forming such a protruding portion to protrude into the inner circumferential surface of the tube, it is possible to obtain a tube in which it is possible to more easily insert an electric wire or the like into the tube.

The embodiment shown in FIG. 10 shows a plate material 6a forming the reinforcing strip plate 6, and the plate material 6a is made of a corrugated material in a direction perpendicular to the longitudinal direction of the strip. Alternatively, if it is bent into the shape shown in Figure 7 or any other required shape and used as the reinforcing strip 6 referred to in the present invention, the pressure deformation resistance will be even greater than in the case of a flat strip material. You can get a tube that is

Moreover, if the waveform direction of the plate material 6b is not a waveform perpendicular to the longitudinal direction as shown in FIG. 11 but a waveform inclined at a predetermined angle, when it is spirally wound, the waveform shown in FIG. As shown schematically, it can be used as a reinforcing strip with corrugations parallel to the longitudinal direction of the tube.

In addition, in the embodiment, a punched metal thin stainless steel plate is described as the material of the reinforcing strip 6, but it may be a steel plate, other strength materials, or a flat plate without punched holes. . Furthermore, the shape, size, and density of the punched holes are matters that can be set arbitrarily, and there is no intention to specify them.

In addition, the synthetic resin materials that form the pipe walls include:
Olefin-based synthetic resins such as polyethylene and polypropylene and vinyl chloride-based synthetic resins are mainly used, but it goes without saying that other synthetic resins may also be used.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments. It can be implemented with appropriate modification within the scope of achieving the following effects.

<Effects of the invention> As described above in detail in the description of the embodiments and as described in the section of means for solving the problems, the present invention provides a reinforcing structure for pipes used as reinforcing materials using wire rods, etc. Instead of using a pipe, it is a wide and long thin metal plate, and it is not used only on a part of the pipe wall, but over the entire top of the spiral waveform and a part of both side walls that connect to the top of the pipe. Since the reinforcing member has a continuous structure and is internalized within the pipe wall made of synthetic resin, it can exert a sufficient reinforcing effect even if the reinforcing member is made of a considerably thin material. As a result, the synthetic resin wall can be made considerably thinner, reducing the overall weight of the pipe and making it easier to transport and handle, reducing the amount of synthetic resin used and bringing cheaper pipes to the market. Not only does it have the effect of being able to provide a flexible structure, but it also has excellent flexibility because the valley of the tube wall and part of both side walls are formed into flexible zones where no reinforcing strips are present. As a result, we were able to obtain a tube that was completely removed.

[Brief explanation of the drawing]

1 to 3 are views of a first embodiment of the present invention, and FIG. 1 is a partially cutaway front view of a tube;
Fig. 2 is a longitudinal cross-sectional view of the main part, Fig. 3 is an exploded explanatory view of the main part, Fig. 4 is a perspective view showing one embodiment of the reinforcing strip plate, Fig. 5, Fig. 7, and Fig. 9 are 6 and 8 are exploded explanatory views of FIGS. 5 and 7, respectively, and FIGS.
The figure is a perspective view showing one embodiment of the reinforcing band material, No. 11.
The figure is a perspective view showing another embodiment of the reinforcing band material.
FIG. 2 is a partial external front view of the tube, and FIG. 13 is a vertical sectional view of the main part showing the conventional structure. In the figure, 1 is the tube wall, 2 is the mountain top, 3 and 4 are the side walls,
5 troughs and 6 indicate reinforcing strips.

Claims (1)

[Claims for Utility Model Registration] A synthetic resin pipe for underground burial with a pipe wall formed in a spiral wave shape, comprising a spiral wave-shaped peak portion 2 forming a pipe wall 1 and side wall portions continuous to the peak portion 2. 3,4
A series of wide and long reinforcing strips 6 made of thin metal sheets are arranged in a spiral manner on the synthetic resin wall forming the pipe wall, and
A pressure-resistant synthetic resin pipe for underground burial, in which the valley portion 5 and a portion of the side wall portions 3 and 4 are formed in a flexible zone made only of synthetic resin material without the presence of a reinforcing strip plate 6. A reinforcing band plate 6 made of a thin metal plate has a large number of small holes 7...
The pressure-resistant synthetic resin pipe for underground burial according to claim 1 of the utility model registration claim, which is a punched metal with... The pressure-resistant synthetic resin pipe for underground burial according to claim 1, wherein the synthetic resin material is olefin-based or vinyl chloride-based. The synthetic resin on both the inner and outer surfaces of the reinforcing band plate 6 made of a thin metal plate has a large number of small holes 7 formed in the reinforcing band plate 6...
A pressure-resistant synthetic resin pipe for underground burial as set forth in claim 1 or 2 of the utility model registration claim, which is integrally fixed via... The pressure-resistant synthetic resin pipe for underground burial according to claim 1, wherein the spiral waveform is a waveform with a rectangular cross section. The pressure-resistant synthetic resin pipe for underground burial according to claim 1, wherein the spiral waveform is a waveform with an arcuate cross section.