JPH0311510Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The pressure-resistant synthetic resin pipe for underground burial according to 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 pipes and cast iron pipes have often been used as underground pipes of this type, but these pipes are both heavy and long. The workability was extremely poor because it was difficult to form, 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 this problem (see Figure 11), but since this synthetic resin tube is long, it has a large number of connections. Since it has the advantage of requiring only a small amount and dramatically shortening the amount of work required to bury it underground, it has become widely used today.

<Problems 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. 11, the tube wall 01 had to be made thick. However, thick pipe walls require a large amount of synthetic resin material for molding, making it difficult to transport and to install underground.

On the other hand, a thin metal plate such as a steel plate is formed into a belt shape, and the central part is formed into a U-shape, etc., and the open ends on both sides are formed into a cross-sectional shape that projects outward, and this is formed into a spiral shape. It is also possible to form a corrugated spiral metal tube by winding the tube into a shape, polymerizing a portion, and welding the polymerized portion, but it is also possible to form a corrugated spiral metal tube by winding the tube into a shape, polymerizing a portion, and welding the polymerized portion, but it is better to weld the polymerized portion so as to maintain watertightness over the entire circumference. This requires a great deal of technology and cost, making it expensive, and it is difficult to avoid distortion due to welding.Moreover, when this is used as an underground pipe, there are problems with moisture and dielectric properties underground. Due to severe corrosion, the pipe cannot withstand use for many years.

Therefore, the present invention eliminates the various drawbacks of the conventional synthetic resin pipes for underground burial, eliminates the drawbacks expected from the metal pipes exemplified above, and has the advantages that both of these pipes have. The purpose of this project is to obtain a pressure-resistant synthetic resin pipe for underground burial with a completely new structure that maximizes the use of this property, reduces the amount of synthetic resin material used, reduces the overall weight, and has excellent pressure resistance.

<Means for Solving the Problems> The inventor of the present invention researched and prototyped tubes with various structures as synthetic resin tubes capable of achieving this purpose. That is,
We have developed methods in which metal wires are buried in the top of a spiral waveform, in a valley, and in multiple lines in parallel at the top of a mountain, but all of these wires have the following results: It was concluded that when a structure with a predetermined pressure resistance is used, 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 includes a spiral wave-shaped peak part 2 forming the pipe wall 1, both side wall parts 3 and 4 continuous to the peak part 2, and the both side wall parts 3, A strip 6 made of a thin metal plate is spirally arranged inside the synthetic resin wall forming the pipe wall over the trough 5 following the trough 4, and at least a part of the trough 5. In this structure, the strips 6 are arranged and formed in an overlapping manner, and the abutting surfaces of the reinforcing strips 6 and the synthetic resin wall are fused and integrated.

<Function> In order to bury the pipe constructed in this way underground, the pipe is laid along a trench excavated to a required depth at the planned pipe site, and the excavator is placed over the trench. The reinforcing strips work together with the synthetic resin walls to provide pressure resistance to the pipes.

<Examples> Examples of the present invention will be described below based on the drawings.

1 to 4 are views 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 in a spiral shape while polymerizing both side edge portions, and a downwardly-opening cross-sectional shape is formed on the outer peripheral surface of the band 9, as shown in FIG. A synthetic resin layer is fused onto the entire outer peripheral surface of a punched metal reinforcing band plate 6 made of a stainless steel plate, which is shaped like a letter and has projecting edges 6a and 6b with both open ends projecting laterally outward. The integrated band A is sequentially wound spirally as shown in FIG. The band body A is integrally fused onto the surface of the cylindrical inner wall 8. In the case of this embodiment, the reinforcing strip 6 has a structure in which the reinforcing strip 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 peripheral surface of the reinforcing strip 6.

In this embodiment, the band A was explained as having a synthetic resin layer fused and integrated on the entire outer peripheral surface of the reinforcing band plate 6, but after the reinforcing band plate 6 was wound around the cylindrical inner wall 8, It goes without saying that a tube having substantially the same structure can also be obtained by covering the outer peripheral surface with a synthetic resin layer.

The embodiment shown in FIG. 5 and FIG.
Instead of adopting the configuration in which the flat band-shaped synthetic resin band 9 is wound in advance in the embodiment, the left lateral outward protruding edge of the band B, which corresponds to the band A, including the reinforcing band plate 6 is made longer. The structure is an extended structure 5c, and a synthetic resin layer is integrally fused to the entire inner peripheral surface of the reinforcing strip 6, that is, the reinforcing strip 6 is buried between the inner and outer synthetic resin layers in the form of a sandwich. It is a structure. Therefore, the left side lateral outward extending protruding edge portion 5c
closes the circumferential opening on the tube axis side of the peak portion 2, and the first
It has a structure that constitutes a continuous cylindrical inner wall corresponding to the cylindrical inner wall 8 in the embodiment. In this embodiment, the synthetic resin layers on both the inner and outer surfaces of the reinforcing strip 6 have a large number of small holes 7 formed in the reinforcing strip 6.
The inside and outside are integrally connected via..., and the band B is coated not only at the lateral outermost protruding edges 5a and 5b, but also at the opposing abutment surface where the reinforcing band plate 6 is present. Since the synthetic resins are integrally fused together, the band B can be more firmly integrated than in the first embodiment.

Although the spirally corrugated tube shown in the above embodiments is shown as having an approximately right cylindrical inner surface, it is assumed that the inner wall is not necessarily a right cylindrical shape but has a somewhat uneven corrugated shape. Good too. 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 such a shape;
Needless to say, it may be formed into a chevron-shaped or wavy spiral waveform as shown in FIGS. 9 to 9.

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

The embodiment shown in FIG. 7 and FIG. 8 is the same as the embodiment shown in FIG. 5 and FIG. Then, a band C whose entire inner and outer circumferential surfaces are covered with a synthetic resin layer in a sandwich-like pattern is spirally wound, and the lengths of the left and right lateral outward protruding edges of the band C are approximately the same length. , has a structure in which approximately the entire length thereof is polymerized and fused.

Therefore, the tube of this embodiment does not have a right cylindrical inner wall formed on the inner surface of the tube unlike the tubes in the embodiments of FIGS.
The space between them is formed into a corrugated cavity.

When inserting an electric wire, etc. into a tube having such a structure, the electric wire, etc. is supported only on the inner peripheral surface of the trough 5, so the friction area between the inner peripheral surface and the electric wire, etc. is small, and the electric wire, etc. Not only does it have the advantage of easy insertion work, but even if dew condensation occurs inside the pipe, the dew water collects in the crest at the bottom of the pipe, so there is no need to directly immerse the wires, etc. (wire sheathing, etc.). It can be well protected for a period of time.

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 extensions of the inclined walls 3 and 4.

It goes without saying that 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 protrusion, it is possible to obtain a tube in which it is easier to 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 is corrugated in a direction perpendicular to the longitudinal direction of the strip. When 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, it has even better pressure deformation strength than the case of a flat strip material. You can get a 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. <Effects of the invention> As explained in detail in the explanation of the embodiments above, and means for solving the problems. As described in the section above, the present invention uses a structure in which the reinforcing structure of the pipe used as a reinforcing material is not one that uses wire rods, but a series of wide, long strip-shaped thin metal plates that are wound spirally. In addition, it should not be used only on a part of the pipe wall, but should be used so that it overlaps at least a part of the trough of the spiral waveform, and the top of the spiral waveform, the side walls connected to this top, and both sides of the spiral waveform. A structure in which the structure is continuous across the troughs connected to the wall, is internalized within the pipe wall made of synthetic resin material, and the abutment surfaces of the reinforcing strip and the synthetic resin wall are fused and integrated. Therefore, even if this reinforcing member is made of a considerably thin material, it can exhibit a sufficient reinforcing effect, and therefore the synthetic resin wall can be made considerably thin, and moreover, the reinforcing member Although thin metal plates are used as the adhesive, the synthetic resin material itself can be fused at a much lower temperature than welding in the overlapping area, and it functions as an adhesive. Not only is it a good product, but it can be easily and reliably fused to maintain watertightness all around the overlapped part, reducing the weight of the entire pipe and making it convenient for transportation and handling. This has the remarkable effect of reducing the amount of synthetic resin used and providing the market with underground pipes that are inexpensive and can withstand use in icy years.

[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 vertical 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, and Fig. 5 is the same as Figs. 7 and 9. 6 and 8 are exploded explanatory views of FIGS. 5 and 7, respectively.
Figure 0 is a perspective view showing an example of the material of the reinforcing band material.
FIG. 11 is a longitudinal cross-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 indicates a valley, and 6 indicates a reinforcing strip.

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
and a valley portion 5 located on the tube axis side of the both side wall portions 3 and 4.
A reinforcing strip 6 made of a thin metal plate is spirally disposed inside the synthetic resin wall that forms the pipe wall, and the reinforcing strip 6 is provided in at least a portion of the valley 5. The plates 6 are arranged in a superimposed manner, and
A pressure-resistant synthetic resin pipe for underground burial having a structure in which the contact surfaces of the reinforcing strip 6 and the synthetic resin wall are fused and integrated. 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, which is a punched metal pipe with a hole extending through it. 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 a. 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.