JPH02146397A - Pressure-proof spiral corrugated pipe - Google Patents

Abstract

PURPOSE:To reduce weight and increase pressure-proof property of a spiral corrugated pipe with the pipe wall of spiral corrugated shape by providing band plates of S-shape on both walls of the pipe wall and using sinthetic resin, etc. for the jointed zone where band plates are not present. CONSTITUTION:A spiral corrugated pipe A with the pipe wall 1 of spiral corrugated shape is made by winding a synthetic resin belt body 11 of roughly channel shape spirally with both ends of its horizontally projected parts lapped with each other and joining them by fusion. Metal band plates 6 and 7 of reverse S shape are provided in the pipe wall 1 internally except for the center portions of the top 2 and bottom 5 of these plates. A synthetic resin belt body 12 of roughly U shape is wound spirally from the outside of the band plates with the horizontally projected parts lapped with each other to join them by fusion with each other. The jointed portions 21 and 51 of the top 2 and bottom 5 of the pipe wall 1, where the metal band plates 6 and 7 are not present, are formed by synthetic resin only. Thus the weight of a whole pipe is reduced and the pipe can be produced easily.

Description

[Detailed Description of the Invention] <Industrial Application Field> The pressure-resistant spiral corrugated pipe referred to in the present invention is mainly buried underground and a current-carrying cable such as an electric wire or telephone line is inserted into the pipe to protect it. These pipes are used for water and sewage purposes, and as liquid transport pipes in factories.

<Conventional technology> Conventionally, among this type of pressure-resistant spiral corrugated pipes, pipes buried underground must withstand strong earth pressure and must have pressure resistance. A pressure-resistant construction for underground burial, in which a series of reinforcing strips made of thin metal plates are buried within the thickness, covering the top of the spiral waveform, both side walls that pass through the top, and part of the valley. The tube is already known through an application filed by the present applicant (see, for example, Japanese Utility Model Application Publication No. 141889/1989).

<Problems to be Solved by the Invention> However, in this way, the shape of the reinforcing strip buried within the thickness of the pipe wall is such that the shape of the reinforcing strip is made to have a spiral waveform at the top and both side walls and further protrude outward from both of the troughs. Let the series form part of
Although it is possible to obtain a tube with extremely high pressure resistance and flat strength, the radius of curvature must be large even though it has a certain degree of flexibility in terms of flexibility. The problem was that it was difficult to obtain small tubes.

Therefore, the present invention provides a pipe in which a strip made of a thin metal plate is embedded in the pipe wall to provide pressure-resistant flattening strength, and in some cases, the strip made of a thin metal plate itself is exposed on the pipe wall surface. In addition, the tube has a flexible structure, which solves the problem of flexibility that the above-mentioned known tube had, reduces the amount of coating resin material used in the above-mentioned known tube, and improves the overall structure. Type I
The aim is to create a tube that is lighter in weight and has excellent pressure resistance.

Means to solve the problem〉 The technical solution is as follows. That is, the structure of the pressure-resistant spiral corrugated tube according to the present invention is a spiral corrugated tube (A) in which the tube wall is formed in a spiral concave-convex wave shape, and the crest of the spiral waveform forming the tube wall (1) is 2), both side walls (3), (4) passing through the mountain top (2), and both side walls (3), (4).
), the valley (5) located on the tube axis side, and the peak (2)
) and the - part of the valley (5), the cross-sectional shapes are approximately S-shaped and inverted S-shaped, and the strips are made of two types of metal thin plates (6), (7). ) are respectively tubes M(1
) The metal strip (6) is arranged and formed as a structural member, and a portion of the peak portion (2) and a portion of the valley portion 5) of the tube wall (1) are formed.

(7) is formed in the connecting bands (21) and (51) where the connecting band (21) and (51) do not exist, and these connecting bands (21) and (51) are connected and formed by a resin material or a rubber material.

<Function> In order to bury the pipe constructed in this way underground, for example,
Excavate the planned piping site to the required depth, run the piping along the clearing, and when using it as a cable protection pipe, insert the electric wire or telephone line into the pipe using a call wire, and then remove the excavated soil. When piping is carried out by covering the piping, if the planned piping site is subject to constraints such as geology, topography or buildings, the radius of curvature must be made small and the piping must be relatively steeply bent. The pipe according to the present invention has a certain degree of freedom due to the presence of a connection zone (21) in which no metal strip is present at the peak (2) of the tube wall (1) and the same zone (51) in the valley (5). Since the tube wall (1) can be bent, piping can be easily installed without locally concentrating excessive tension and compressive force on the tube wall (1).

<Example> An example of the present invention will be described below with reference to FIG.

1 to 3 are diagrams showing one embodiment of the present invention (hereinafter referred to as the first embodiment), in which the spiral waveform pipe (A) shown in FIG.
is a spirally corrugated pipe in which the cross-sectional shape of the pipe wall (1) is formed into a substantially U-shape, and as shown in FIG. Abbreviation S consisting of horizontal ends (6b) and (Be) bent in the direction
An inverted S-shaped metal strip (7) consisting of a central vertical portion (7a) and upper and lower horizontal ends (7b) and ()C), which are made by inverting the metal strip (6) in the left-right direction. As shown in the second [1
) so that the central part of the peak (2) and the central part of the valley (5) remain, and the central vertical parts (6a) and (7a) are located on both side walls (3) and (4). The entire inner and outer peripheral surfaces of these are sandwiched and fused together with synthetic resin materials, and these two types of left and right metal strips (8), <7) are placed inside the pipe wall (1). It is a structure that is arranged internally.

As shown in FIG. 3, the spiral corrugated pipe (A) referred to in this embodiment is made of synthetic resin and has a substantially U-shaped cross section with a downward opening, with its lower end projecting horizontally outward ( The inner resin wall of the pipe wall (1) is formed by sequentially winding the bound band (11) in a spiral shape (hereinafter referred to as an inverted U-shape) while overlapping its horizontally protruding ends and fusing the overlapping parts. After that, while the vertical parts (6a) and (7m) of the two types of steel strips (6) and (7) are in contact with the left and right side walls (3) and (4), both metal strips are attached. The strips (8) and (7) are each arranged in a spiral manner, and from the outside side, a synthetic resin strip having a substantially U-shaped cross section with the above-mentioned synthetic resin strip (11) upside down. While spirally winding the band (12), both horizontal end portions thereof are polymerized and fused and fixed together to form the outer resin wall of the tube wall (1), and both resin bands (11) are bonded together. ,
A metal strip (
8) and (7) are integrally connected to the interior and fused to form a spiral tube structure as shown in FIG.

In this way, the left and right side walls (3) of the tube wall (1),
(4), both side parts of the peak part (2) passing through these, and both side parts of the valley part (5).
) are arranged internally, and metal strips (6) are provided at the center of the peak (2) and the center of the valley (5).

Connection band using only synthetic resin material (7) does not exist (21)
, (51) exists.

The embodiment shown in FIGS. 4 and 5 is an embodiment related to a spirally corrugated pipe (A) in which the cross-sectional waveform of the pipe wall (1) is an arcuate waveform passing through a smooth arc. This shows a manufacturing method different from that in the example.

As shown in FIG. 5, this embodiment consists of two types of stainless steel strip plates (6), each having a substantially S-shaped cross-sectional shape passing through a smooth arc, and an inverted S-shaped cross-sectional shape symmetrical to the S-shaped cross-sectional shape. 7) is passed through a synthetic resin extruder (not shown), and a synthetic resin material is fused and molded onto the entire inner and outer peripheral surfaces (6^).

() ^), and the inverted S-shaped strip on the right side in the figure (
)^) is wound spirally in advance, and then the S-shaped strip material (6A) on the left side in the figure is wound, and its upper end is placed over the adjacent upper end of the previously wound strip material (7^). The respective molded resin materials are fused and connected to each other in a polymerized manner, and then the lower end of the next wound inverted S-shaped strip material (78) is attached to the S-shaped strip material (6^). They are brought into butt and overlapping contact on the lower end and fused and connected to each other to form a series of spiral tubes in sequence.

In the case of this embodiment, the metal strips (6) and (7) have a synthetic resin material fused and fixed in advance on the entire inner and outer circumferential surfaces of each of the metal strips (6) and (7), so that the inner and outer surfaces of the metal strips (6) and (7) are sealed in advance within the synthetic resin coating. As shown in Figure 4, the opposing joints of both strips (6) and (7) are made of synthetic resin only, without the presence of metal strips (8) and (7). 1 (21) and (51) are formed into a spiral tube.

In this embodiment, the band to be wound first is a metal band plate (6).
, <7), synthetic resin material is integrally molded onto the entire inner and outer circumferential surfaces of resin molded strips (6^), ()^), and only these molded strips (6^), ()^) are used. Although the description has been made assuming that the pipe wall (1) is formed using the pipe wall (1),
As explained in the first embodiment, first, the inner surface of the band (11) is made of only synthetic resin material.
After forming the inner resin wall of the tube wall (1) by winding the resin, these molded strips (6^
), (7^) may be wound and fused together, or it may have a structure in which an outer synthetic resin layer is coated on the outer peripheral surface, or an inner resin wall may be formed. It goes without saying that a structure in which only the outer resin wall is coated and formed without forming the outer resin wall may also be used.

Furthermore, the metal strips (6) and (7) are not limited to simple flat plates, but may also be so-called punching metal plates in which many small holes are formed through the plate surface. When a synthetic resin coating is applied using a metal plate with small holes formed through it, the synthetic resin material on both the inside and outside of the metal plate is integrally connected to the inside and outside through the large number of small holes formed in the metal plate. , the connection between the metal strips and the inner and outer resin layers becomes strong, but as in the case of the above embodiment, the metal strips (6) and (7) according to the present invention
) does not necessarily have to have such small holes formed therein.

In addition, in manufacturing the resin-molded strips (6^) and (7^), there is not only the method of extruding and covering the metal strips (8) and (7) together from the die of the synthetic resin molding machine described above. , for example, a metal strip (6) in the resin liquid,
<7) A method of coating by dipping, a method of painting or coating, etc. are used.

FIG. 6 is a diagram showing another means for manufacturing the spirally corrugated pipe (A) shown in FIG. , (7^) are substantially integrated, and two types of metal strips (6) and (7) are installed inside the strip material, and a strip material (67 ) is extruded from a resin extrusion molding machine, wound spirally, and the side edges are fused together to form a spirally corrugated tube. In this case, it goes without saying that a similar tube can be obtained by making the strip material (67A) upside down and fusion splicing it at the top (2) of the tube wall (1).

Next is the spiral corrugated pipe wall (1) and the metal strip (6).

A modification example of (7) will be explained.

In each of the above embodiments, the spiral waveform shape of the pipe wall (1) was shown as having a cross-sectional cross-sectional waveform and an arcuate waveform, but for example, as shown in FIG. The cross-sectional shape of the made band plates (6) and (7) is a deformed S-shaped one that passes through one of the sloped side wall parts (3) and the valley part (5) in the pipe wall (1), and a crest part (2). ) and the other inclined side wall (
4) As a deformed inverted S-shape that passes through the pipe wall (1)
By making the tube wall (1
), the far-throw corner between the peak part (2) and one inclined side wall part (3), and the far-throw corner between the other inclined side wall part (4) and the valley part (5) are made of metal. A pipe (A) is formed having connection zones (21), (51) without strips <6), (7).

The metal strips (8) and (7) referred to in the present invention are not necessarily the same in size, shape, thickness, etc.
It is not necessary that they have the same thickness, and the thickness of the resin forming the tube wall (1) does not need to be the same throughout. That is, for example, as shown in FIG. ) to the mountaintop (2
) and the center part of the trough (5) may be formed to have a thickness within (9) and <10> compared to other parts. In addition, the shape of the pipe wall (1) is as shown in Figure 9 at the top of the mountain (
2) may be trapezoidal in shape, and the troughs (5) may have a different arcuate wave shape, and both metal strips (6) in FIG. The shape of (7) is such that the upper end side is bent in a substantially horizontal position and the lower end side is bent into a gentle curved shape along an arcuate curve, in accordance with the shape of the pipe wall (1). , tube wall (1
) is buried within.

In addition, the wall thickness of the tube wall (1) is not only partially within the thickness range (9), <10) as shown in FIG. 10) is the mountaintop (2)
Alternatively, it may be formed over the entire width of the trough (5) or preferably both <2), <5), or the metal strips (6), (7) may be formed on the pipe wall (1). By embedding it in a position biased to one side in the thickness direction, a thick coating resin part (9> , (10) may be located.

In this way, if the thick inner part of the resin material is formed on the inner surface of the trough (5), even if wear due to friction of the cable etc. occurs, the metal band plate ( 6), (7
), these metal strips (6),
(7) can be reliably prevented from becoming spherical and causing rust, and if this thick inner resin part is formed on the outer surface side of the mountain top, when laying the pipe If the pipe were to be damaged by pulling on it or hitting a sharp corner, such as a stone or rock, the metal strips (6) and (7) would be exposed immediately. The advantage is that it can prevent things from happening.

Furthermore, as shown in FIG. 9, if a circular inner tube wall (8) is formed on the inner surface of the tube wall (1) using a flexible soft synthetic resin or rubber material, then the upper When used as a sewer pipe or a liquid transport pipe, it can be conveniently used as a pipe with low resistance for liquids, etc.

Each of the above embodiments is a pipe having a structure in which both the inner and outer surfaces of the metal strips (6) and (7) are entirely covered with a coating material such as a synthetic resin material, in other words, the pipe wall is made of a synthetic resin material or the like. Although a pipe has been described in which the metal strips (6) and (7) are embedded inside the forming material, the present invention also includes the metal strips (6) and (7).
It is not necessary that the entire circumferential surface of (7) be covered with a synthetic resin material, etc., and the material of the gold IJ strips (6) and (7) used itself is a rust-resistant material. For example, when using a material that has been treated with anti-corrosion treatment such as plating, electric coating, metallic coating, or resin baking coating, use a metal strip (as shown in the following example). 6) and (7) can also be implemented with a structure in which part of the structure is exposed on the pipe wall surface.

The embodiment shown in FIG. 10 includes two types of metal strips (6),
<7), the peak part (2) of the pipe wall (1) is arc-shaped and the valley part (
5) are arranged in a horizontal manner at intervals from each other, and the entire outer peripheral surface of the pipe wall (1) is covered with a resin band (12), and the inner surface of the peak part (2) and The inner side part of the valley (5) is made of resin material (11^).

(11B), the connection bands (21) and (51) were formed only from resin material, and the inner side portions of the left and right side walls (3) and (4) were exposed to the pipe wall surface. It is something.

The embodiment shown in FIG. 11 includes two types of metal strips (6),
Both the inner and outer surfaces of the peak (2) side of (7) and the inner and outer surfaces of the valley (5) side are covered with resin materials (11^, 12^ and 11B, 12
．． 8), and part of the outer surfaces of both side walls (3) and (4) near the peak (2) and the inner surfaces of both side walls (3) and (4) near the valley (5). It covers both side walls (3) and (4) of metal strips (6) and (7).
) The structure is such that both the inner and outer surfaces of the intermediate portion remain spherical.

The embodiment shown in FIG. 12 consists of two types of metal strips (13).
, (7), both the inner and outer surfaces of the peak (2) and the inner and outer surfaces of the valley (5) are made of resin (ilA, 12^ and 118.12B).
This is an embodiment in which the inner and outer surfaces of both side walls <3) and (4) are entirely spherical.

The invention may be implemented in this manner.

In addition, as the material for the metal strips (6) and (7), in addition to thin stainless steel plates and steel plates, iron plates may be used, and other metal strength materials may also be used. Also,
When forming the punched holes described above, the shape, size, and density may be set arbitrarily.

In addition, polyolefin synthetic resins such as polyethylene and polypropylene and vinyl chloride synthetic resins are mainly used as synthetic resin materials to cover the metal strips and form the connection bands, but other synthetic resins may also be used. Alternatively, a rubber-based resin material such as rubber or synthetic rubber may 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 structure of these embodiments. It can be implemented with appropriate modification within the range of achieving the following effects.

<Effects of the Invention> As described above in detail through the description of the embodiments and as described in the section of means for solving the problems, the present invention provides a wide metal g! Using an Ai plate, it is deformed to form an S-shape and an inverted S-shape, which are placed opposite to each other on both sides of the spiral waveform, and these two metals are By disposing and using metal strips on the pipe wall, a spirally corrugated pipe structure is created in which a connection zone made only of resin material without the metal strip is formed at the peak and trough portions of the pipe wall. Therefore, by placing the metal band members on both side walls of the tube wall, it is possible to form a tube body having sufficient pressure-resistant flat strength,
Therefore, even if the entire inner and outer circumferential surfaces of these metal strips are covered with a synthetic resin material, the covering synthetic resin material can be made considerably thinner, reducing the weight of the entire pipe and making it easier to transport and handle. Not only is it convenient and has the effect of reducing the overall amount of synthetic resin material used, but it also has two connection zones formed at the peak and valley without metal strips. By having these two connecting zones, it is possible to exert a bending action, and by forming these two connection zones not in the side wall portion but at the peak and valley portions of the pipe wall, flexibility can be exerted. Therefore, when installing piping, it is necessary to take into account changes in the geology and topography.
In addition, we have come to expect the remarkable effect that it is possible to avoid obstacles such as rocks and buildings and to install piping in a position with a relatively small radius of curvature.

In the figure, (1) is the pipe wall, (2) is the peak, (3) and <4) are the side walls, (5) is the valley, (6) and (7) are the metal strips,
(21).

(51) is a connection zone without a metal strip, and (A) is a spirally corrugated tube.

[Brief explanation of the drawing]

1 to 3 are views of a first embodiment of the present invention, in which FIG. 1 is a partially cutaway front view of a tube, FIG. 2 is a vertical sectional view of the main part, and FIG. are exploded explanatory diagrams of the main parts, Figures 4 and 5
The figures are longitudinal sectional views and exploded explanatory views of main parts showing other embodiments,
FIG. 6 is an exploded explanatory view of the main parts showing still another embodiment, and FIG.
Figures 1 through 12 are longitudinal cross-sectional views of essential parts showing still further embodiments. fig fig fig fig fig fig fig fig fig fig fig fig fig fig fig.

Claims (1)

[Scope of Claims] [1] A spirally corrugated pipe (A) in which the pipe wall is formed into a spiral uneven wave shape, comprising a crest (2) of the spiral waveform forming the pipe wall (1) and the crest. Both side wall parts (3) passing through part (2), (
4) and the valleys (5) located on the tube axis side of the both side walls (3) and (4), excluding a part of the peak part (2) and a part of the valley part (5). , a series of two types of thin metal plate strips (6) whose cross-sectional shapes are approximately S-shaped and inverted S-shaped;
(7) are arranged and formed as constituent members of the pipe wall (1), and a part of the peak part (2) and a valley part (
5) is formed in the connection zones (21), (51) where the metal strips (6), (7) are not present, and these connection zones (21), (51) are made of synthetic resin material. Or pressure-resistant spiral corrugated pipes connected and formed using rubber material. [2] The connection zones (21) and (51) where the metal strips (6) and (7) are not present are approximately in the center of the peaks (2) and valleys (5) of the pipe wall (1), respectively. The pressure-resistant spiral corrugated pipe according to claim 1, wherein the pressure-resistant spiral corrugated pipe is formed in a section.