JP3165982B2 - Pressure-resistant spiral corrugated tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The pressure-resistant spiral corrugated tube according to the present invention is:
It is mainly buried in the ground and used to protect it by inserting a current-carrying cable such as electric wire or telephone wire into its pipe,
It is a pipe used as a pipe for water supply and sewerage or a liquid transport pipe in a factory.

[0002]

2. Description of the Related Art Among conventional pressure-resistant spiral corrugated pipes of this type, pipes buried in the ground need to withstand strong earth pressure and need to have pressure resistance. As shown in FIGS. 8 and 9, a spiral wave-shaped peak 2 is formed inside a thick wall of a synthetic resin, rubber, or the like forming the tube wall 1, and both side walls 3, 4 connected to both sides of the peak 2, and a valley. A pressure tube for underground burial, in which a series of thin metal reinforcing strips 6 are buried in a part of 5, has been developed by the present applicant and has already been filed.

[0003]

As described above, the metal reinforcing strip 6 is disposed over the peaks 2, the side walls 3, 4 and a part of the valleys of all the peaks forming the tube wall 1. When the pipe is formed, a pipe which is extremely excellent in pressure resistance and flat strength can be obtained. However, in such prior art pipes, the part where the metal reinforcing strip 6 is not present is a part of the valley 5 of the pipe wall 1,
More specifically, it has been found that there is a problem that the pipe becomes a rigid pipe because it becomes only the middle part of the valley 5 and lacks flexibility. The inventor of the present invention has conducted various studies and trial productions, and as a result, has completed the present invention. As in the case of the prior art tube, the reinforcing strip 6 made of a thin metal plate was used.
The purpose of the present invention is to obtain a tube which is excellent in flexibility while being a tube having an increased flat pressure resistance by utilizing the method.

[0004]

The technical solutions are as follows. That is, the structure of the pressure-resistant spiral waveform tube according to the present invention will be described using the reference numerals shown in the embodiments.
Of the first peak A, the second peak B, and the first valley C
And the second valley D are formed in a double pitch shape. The peak 2 of either one of the first peak A and the second peak B and the side walls 3 and 4 connected to both sides thereof are formed. Alternatively, the cross-sectional shape of the valley 5 of one of the valleys C of the first valley C and the second valley D and the side walls 4 and 3 connected to both sides of the valley 5 is substantially continuous. A strip 6 made of a thin metal plate formed in an inverted U-shape or a substantially U-shape is buried in the inside of the wall thickness of the tube wall 1 or, depending on the case, is exposed on the inner side of the tube wall 1. 1 and a structure covered with a synthetic resin material or a rubber material, and a crest 2 of the other crest B and both side walls 3 and 4 connected to both sides thereof, or
The valley 5 of the other valley D and both side walls 4 and 3 connected to both sides thereof
Are made of only a synthetic resin material or a rubber material constituting the tube wall 1, and these metal strips 6
A and the mountain B where the metal strip 6 is not arranged, or the valley C where the metal strip 6 is arranged.
And the valleys D on which the metal strips 6 are not provided are alternately and integrally connected.

[0005] Further, in a pipe having such a structure,
Depending on the case, the inner wall of the tube 1 may have an inner wall 7, the outer wall of the tube 1 may have an outer wall 8, and the inner wall and the outer wall may have a wall. It may be implemented as having 7 and 8.

[0006]

In order to bury the pipe constructed in this way, for example, in the ground, just as in the conventional case, the pipe to be piped is piped along a groove excavated to a required depth, and the excavated soil is placed on the pipe. Perform by covering. When used as a cable line protection tube, an electric wire or telephone line is inserted and wired inside using a nominal line. In this piping, the pipe of the present invention is a pipe having excellent pressure resistance, and can be piped relatively easily to a planned pipe location.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are views showing one embodiment of the present invention (hereinafter referred to as a first embodiment). FIG. 1 shows the overall shape of a pipe, and FIG. FIG. The pipe is a spiral corrugated pipe in which the cross-sectional shape of the pipe wall 1 is formed in a trapezoidal wave shape, and includes a first peak A, a second peak B, and a first peak B.
It is formed in a double pitch shape composed of a valley C and a second valley D, and only one of the first peaks A and the second peaks B thus formed in a double pitch shape has
The steel sheet is continuously connected to the peak 2, the side walls 3, 4 connected to both sides thereof, and the valleys 5, 5 connected to both sides of the side walls 3, 4. The cross section is formed in a trapezoidal shape with a downward opening and its lower end is protruded horizontally outward in the horizontal direction. Is formed so that the entire inner and outer surfaces are covered so as to be located inside the thickness of the synthetic resin material constituting the tube wall 1, and the other peak B of the other peak B forming the double pitch and both sides thereof And a part of the valleys 5, 5 connected to both sides of the side walls 3, 4 formed of only the synthetic resin material constituting the tube wall 1. It is.
In this way, the mountain A on which the metal strips 6 are internally disposed and the mountain B on which the metal strips 6 are not disposed,
The spiral corrugated tube structure is arranged alternately and integrally connected.

In the tube shown in the embodiment, an inner tube wall 7 is formed integrally with the tube wall 1 on the inner peripheral surface side of the tube wall 1 so that the inner surface is substantially straight. The structure is such that cavities 9, 9 are formed between the inner pipe wall 7 and the first ridge A and the second ridge B.

The second embodiment shown in FIG. 3 is a spiral tube in which the shape of the tube wall 1 is trapezoidal as in the case of the first embodiment, and the metal strip 6 embedded in the tube wall 1 is shown in FIG. 1 shows an embodiment in which the shape of the trapezoid is a trapezoidal shape that is open upward. That is, in this embodiment, the valley portion 5 of one valley C of the first valley C and the second valley D and both side walls 4 and 3 connected to both sides thereof and both sides connected to the both side walls 4 and 3 are provided. A strip plate 6 made of a stainless steel thin plate having a cross section formed in a substantially U-shape substantially the same as that of the first embodiment is continuously connected to a part of the peaks 2 and 2. The inner and outer surfaces are covered with a synthetic resin material constituting the wall 1 so as to be embedded in the inside of the wall thickness of the tube wall 1, and the valley 5 of the other valley D and both side walls 4, 3 connected to both sides thereof are formed. And a part of both side peaks 2 and 2 connected to the side walls 4 and 3 have a structure formed only of a synthetic resin material constituting the tube wall 1, and these metal strips 6 are provided. Valleys C and valleys D on which the metal strip 6 is not disposed are alternately and integrally connected to form a double pitch spiral. It is obtained by the elephants.

In the tube shown in the embodiment, an inner tube wall 7 is formed integrally with the tube wall 1 on the inner peripheral surface side of the tube wall 1 so that the inner surface is substantially straight. , Also on the outer peripheral surface side of the pipe wall 1,
The outer tube wall 8 is formed integrally with the tube wall 1 so that the outer surface thereof is substantially a straight tube.
Cavities 9, 9 are formed between the ridges B, and cavities 10, 10 are also formed between the outer tube wall 8 and the first valley C and the second valley D. is there. It is needless to say that the outer tube wall 8 does not need to be formed together with the inner tube wall 7, and may have a structure in which only the outer tube wall 8 exists without the inner tube wall 7.

The third embodiment shown in FIG. 4 relates to an embodiment relating to a spiral corrugated tube in which the cross-sectional shape of the tube wall 1 is a corrugated shape in which the peak 2 is slightly flat and the valley 5 is connected in a smooth arc. It is shown. In this embodiment, the cross-sectional shape of the metal strip 6 is a substantially U-shaped upward opening with a central portion recessed in a smooth arc shape, and the upper end portion of the metal strip 6 protrudes in the laterally outward direction. As in the case of the second embodiment, the valley 5 in one of the first valleys C, the side walls 4 and 3 connected to both sides thereof, and the tops 2 and 2 connected to the side walls 4 and 3.
Of the tube wall 1, the inner and outer surfaces thereof are covered with a synthetic resin material constituting the tube wall 1, and the tube wall 1 is buried inside the wall thickness. The valley portion 5 of the two valleys D, the side wall portions 4 and 3 connected to both sides thereof, and both the mountain top portions 2 and 2 connected to the side wall portions 4 and 3 are made of only the synthetic resin material constituting the tube wall 1. The valleys C where the metal strips 6 are disposed and the valleys D where the metal strips 6 are not disposed are alternately and integrally connected spirally. It is a tube structure that has been formed.

The fourth embodiment shown in FIG. 5 relates to a spiral corrugated tube in which the tube wall 1 has a substantially arc-shaped spiral waveform and a substantially straight inner peripheral surface. .
In this embodiment, the cross-sectional shape of the metal strip 6 is a substantially inverted U-shape having a central portion protruding in an arc shape and open downward, and a lower end portion thereof is bent inward.
As in the case of the first embodiment, the crest 2 of one first crest A, the side walls 3 and 4 connected to both sides thereof, and the inner tube on the inner surface side of the crest 2 connected to the side walls 3 and 4 As a state of being continuously connected to a part of the wall 7, the entire inner and outer surfaces of the tube wall 1 are covered with a synthetic resin material constituting the tube wall 1, and the tube wall 1 is buried inside the wall thickness. Second mountain B
Of the crest 2 and both side walls 3 and 4 connected to both sides thereof and all the valleys 5 and 5 connected to both sides of the both side walls 3 and 4 are formed only of the synthetic resin material constituting the tube wall 1. Is a tube structure integrally formed in a spiral shape.

In each of the above embodiments, the inner and outer surfaces of the metal strip 6 are entirely covered with a tube wall forming material such as a synthetic resin material, in other words, the inside of the tube wall forming material such as a synthetic resin material. Although the pipe structure in which the metal strip 6 is buried is described above, the entire circumference of the metal strip 6 according to the present invention does not necessarily have to be covered with the pipe wall forming material. The material itself of the metal strip 6 to be made is a rust-resistant material such as stainless steel, or is subjected to a rust-preventive treatment such as plating, swimming coating, metallic coating, or resin baking. In the case of using a metal material that has been applied, as shown in the following embodiment, a part of the metal strip 6 may be configured so as not to be covered on the inner surface side of the tube wall.

The fifth and sixth embodiments shown in FIGS. 6 and 7 have a spiral waveform in which a part of the inner surface side of the metal strip 6 is not covered with the resin material forming the tube wall 1. 1 shows an embodiment relating to a pipe. In the pipe of the embodiment shown in FIG. 6, the whole structure of the pipe wall 1 is an inverted U-shaped section having a substantially trapezoidal cross section substantially similar to that shown in the first embodiment, and the portion of the first mountain A is shown. The inner surface portion of the metal thin plate 6 facing the inner tube wall 7 is not directly covered with the resin material forming the tube wall 1, but is formed by the resin material forming the inner tube wall 7. The structure is indirectly hermetically sealed. In other respects, the structure is substantially the same as that of the first embodiment.

In the pipe of the embodiment shown in FIG. 7, the cross-sectional shape of the metal strip 6 disposed at the first peak A is a downwardly open inverted U whose central portion is recessed in an arc shape. The lower end portion is bent in an arc shape in the laterally outward direction, and the bent portions in the laterally outward direction are the valleys 5, 5 located on both sides of the first mountain A. The inner surface of the top 2 of the first crest A and the side walls 3 and 4 connected to both sides thereof are not covered with the resin material forming the tube wall 1. It is. The top 2 of the other second mountain B, the side walls 3 and 4 connected to both sides thereof, and the valley 5 connected to both sides of the side walls 3 and 4.
As in the other embodiments, a part of the tube 5 is integrally formed in a spiral shape as a structure formed only of the synthetic resin material constituting the tube wall 1.

The shape of the ridge A on which the metal strip 6 is disposed and the ridge B not disposed are not necessarily the same shape according to the present invention. For example, the metal strip 6 is disposed. Mountain B without metal strip 6 compared to the shape of mountain A
The height may be reduced, or the width may be varied. In the case where the cylindrical inner pipe wall 7 is integrally formed on the inner surface side of the pipe wall 1 as shown in the first embodiment and the other embodiments, the pipe is used as a water and sewage pipe or a liquid transport pipe. When used, it can be conveniently used as a tube with low resistance to liquids and the like. If necessary, a thread may be added to the tube wall 1 forming material including the inner tube wall 7, particularly, the tube wall 1 forming material portion where the metal strip 6 is not provided.
A fiber material such as a woven fabric, a nonwoven fabric, or a glass fiber or a reinforcing material such as a metal net is embedded and reinforced to withstand a high internal pressure, so that it can be used as a high-pressure transport pipe.
The present invention may be appropriately modified and implemented in this way.

The material of the metal strip 6 may be a stainless steel sheet, a steel sheet, an iron sheet, or another metal sheet. As a synthetic resin material for forming the tube wall 1, a polyolefin-based synthetic resin such as polyethylene or polypropylene or a vinyl chloride-based synthetic resin is mainly used, but other synthetic resins may be used. A rubber-based resin material such as rubber or synthetic rubber may be used.

The embodiments which are considered to be representative of the present invention have been described above. However, the present invention is not necessarily limited to the structures of these embodiments, but includes the structural requirements according to the present invention. The above-mentioned purpose can be achieved, and can be carried out with appropriate modifications within a range having the following effects.

[0019]

As is apparent from the above description of the embodiment, in the present invention, the corrugated waveform forming the tube wall is made to have a double pitch, and either one of the first peak and the second peak is used. Over the crest forming the crest and both side walls connected to both sides thereof, or across the valley forming one of the first valley and the second valley and both side walls connected to both sides thereof In a state of being connected in series, a metal thin plate is arranged and formed with a metal thin plate in a state where at least the surface side is covered with a synthetic resin material or a rubber material constituting a tube wall, and the other peak is formed. The crest to be formed and both side walls connected to both sides thereof, or the valley to form the other valley and both side walls connected to both sides thereof are formed as tube wall portions having no metal band plate, and The peak or valley where the strip is placed and the metal strip are The helical tube structure is formed in such a way that the peaks or valleys that are not alternately and integrally connected are formed. Therefore, in the manufacture thereof, the existing pipe manufacturing apparatus used in the prior art is used to achieve extremely high efficiency. It can be manufactured well, and the manufactured pipe is a pipe excellent in pressure resistance deformation performance, but it can also obtain a pipe excellent in flexibility, reducing the weight of the entire pipe, convenient for handling and transporting In addition, a remarkable effect that pipes can be easily obtained can be expected.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a pipe showing a first embodiment.

FIG. 2 is a longitudinal sectional view of a tube wall portion of the embodiment.

FIG. 3 is a longitudinal sectional view of a tube wall portion showing a second embodiment.

FIG. 4 is a longitudinal sectional view of a tube wall portion showing a third embodiment.

FIG. 5 is a longitudinal sectional view of a tube wall showing a fourth embodiment.

FIG. 6 is a longitudinal sectional view of a tube wall showing a fifth embodiment.

FIG. 7 is a longitudinal sectional view of a tube wall showing a sixth embodiment.

FIG. 8 is a longitudinal sectional view of a tube wall portion of the reference structure.

FIG. 9 is a longitudinal sectional view of a tube wall portion of another reference structure.

[Explanation of symbols]

 (1) Pipe wall (2) Summit (3), (4) Side wall (5) Valley (6) Metal strip (7) Inner pipe wall (8) Outer pipe wall (A) First mountain ( B) Mountain 2 (C) Valley 1 (D) Valley 2

Claims (3)

(57) [Claims] 1. A tube having a tube wall formed in a spiral corrugated shape, wherein the corrugation of the tube wall (1) is formed by a first peak (A) and a second peak (A).
(B) and the first valley (C) and the second valley (D) are formed in a double pitch shape, and one of the first ridge (A) and the second ridge (B) is formed.
The top (2) of (A) and both side walls (3) and (4) connected to both sides
Or one of the first valley (C) and the second valley (D)
A metal having a cross-sectional shape formed in a substantially inverted U-shape or a substantially U-shape, which is continuous with the valley (5) of (C) and both side walls (4) and (3) connected to both sides thereof. A thin strip (6)
The top of the other crest (B) is formed and formed in such a manner that it is covered with the synthetic resin material or the rubber material constituting (1) on both the front surface side and the inner surface side or while leaving a part of the inner surface side covered. (2) and both side walls (3), (4) connected to both sides, or
The valley (5) of the other valley (D) and both side walls (4) connected to both sides thereof,
(3) is formed only of a synthetic resin material or a rubber material constituting the tube wall (1), and the mountain (A) on which the metal strips (6) are disposed and the metal strip (6) Mountains without)
(B) or the valley where the metal strip (6) is located (C)
And a valley (D) in which the metal strip (6) is not provided. 2. The pressure-resistant spiral corrugated tube according to claim 1, wherein an inner tube wall is formed on an inner peripheral side of the tube wall. 3. The pressure-resistant spiral corrugated tube according to claim 1, wherein an outer tube wall (8) is formed on an outer peripheral side of the tube wall (1).