JPH0625756Y2 - Pressure resistant tube and pressure resistant laminated tube - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pressure pipe suitable for use as a sewer pipe or a distribution pipe buried in the ground.

[Conventional technology]

Conventionally, a fume pipe or a cast iron pipe has been used because this type of pipe is required to have pressure resistance, but it has a problem that it is difficult to handle due to its large weight and the workability is poor.

For this reason, for example, as described in Japanese Utility Model Laid-Open No. 61-141889, a reinforcing strip made of a thin metal plate having a U-shaped cross section is screwed at a predetermined pitch on the outer periphery of a cylindrical wall made of synthetic resin. A pressure-resistant synthetic resin tube that has been wound and integrated into a single shape has been developed.

[Problems to be Solved by the Invention] However, according to this pressure-resistant synthetic resin pipe, both end edges of a reinforcing strip made of a metal plate having a U-shaped cross section are bent outward to form a flange portion. Since the pipe wall is reinforced by embedding it in a cylindrical synthetic resin pipe wall, not only is it difficult to form this flange portion, but also when such a flange portion is formed, the bendability is hindered. It becomes difficult to wind around the forming shaft, and it becomes difficult to manufacture a small diameter pipe. In addition, in order to manufacture a large diameter pipe, it is necessary to increase the height of a mountain bent in a U-shaped cross section. However, the higher the height of the mountain, the more difficult it is to bend and the more difficult it is to manufacture.

Further, the cross-sectional shape of the reinforcing strip made of a thin metal plate becomes a flared shape due to the formation of the flange. Therefore, when the reinforcing strip is bent along the forming axis at the time of manufacturing the pipe, the space between both ends of the reinforcing strip will be further expanded. It becomes difficult to manufacture the uniform tube by deforming in the direction of

Further, when a load such as earth pressure is applied to the top surface of the spirally wound reinforcing strip having a U-shaped cross section, the flange portion is made of a synthetic resin so as to be deformed in the expanding direction between both ends as described above. There is a risk of biting into the pipe wall and damaging the pipe wall.In addition, when a crane or the like is driven into the pipe wall where the flange portion does not exist during repair work, etc.,
There was a problem that the pipe wall was damaged.

An object of the present invention is to provide a pressure resistant tube and a pressure resistant laminated tube which can solve such problems and can easily connect the tubes to each other.

[Means for Solving the Problems]

In order to achieve the above object, the pressure resistant pipe of the present invention has a cylindrical synthetic resin pipe wall as shown in the drawings corresponding to the embodiments.
The flat metal plate (2) was embedded in the inside of the spiral in such a manner that the opposite side end surfaces were joined to each other, and both end edges were formed flangeless on the outer peripheral surface of the pipe wall (1). The metal spiral ridges (3) having a gate-shaped cross section are wound and integrated, and the resin-coated flat strip metal plates (4) are opposed to each other at the end faces between the top surfaces of the metal spiral ridges (3). The outer tube (6) having a flat outer peripheral surface is formed by spirally winding and integrating so as to be joined.

Further, on the outer periphery of such a pressure-resistant pipe, a spiral ridge (3a) made of metal having a gate-shaped cross section is wound around both ends and formed integrally to form an outer layer pipe (7). A resin-coated flat metal plate (8) is spirally wound between the top surfaces of the spiral ridges (3a) so that the opposite side end surfaces are joined to each other, and integrated to form a pressure-resistant laminated tube.

[Action]

The flat metal plate (2) embedded in the cylindrical synthetic resin pipe wall (1) increases the strength of the pipe wall (1), and the pipe wall (1) is protected against earth pressure and other external forces. Prevent damage.

Further, since the metal spiral ridges (3) spirally wound around and integrated with the pipe wall (1) are not formed with flanges at both inner end edges, they can be easily formed into a cross-sectional portal shape. Not only
It can be bent with a large bending degree so that its top is on the outer diameter side, and there is no risk of deforming into a flared shape even when bending, so even a small diameter pipe can be accurately and easily It can be molded into.

Furthermore, the metal spiral ridges (3) can also be used against earth pressure and other loads.
Further, the flat metal plate (2) embedded in the pipe wall (1) can strongly withstand.

In addition, the resin-coated flat strip metal plate (4) is spirally wound and integrated so that the opposite side end faces are joined to each other between the top faces of the metal spiral ridges (3) of the pressure-resistant pipe. Outer tube with flat surface
Since (6) is formed, pressure-resistant pipes of a certain length can be easily joined to each other, and the outer periphery of this outer pipe (6) has the same shape or a similar shape as the metallic spiral ridge (3). By winding and integrally forming the metal spiral ridge (3a) to form the outer layer tube (7), a large-diameter pressure-resistant tube having greater strength can be obtained.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. (1) is a cylindrical tube wall made of synthetic resin such as polyethylene, and the tube wall (1) has a constant width of 0.1 to 1.0 mm. A flat metal plate (2) of a certain degree is embedded in a spiral shape so that the opposite end faces are joined together.

To form such a tube wall (1), a synthetic resin coating layer such as polyethylene having a certain thickness is integrally laminated on the entire surface including the front and back surfaces of the flat metal plate (2), and the resin coating is applied. Place the flat metal plate (2) on the forming shaft (not shown) so that the one end face of the previously wound plate part and the other end face of the next wound plate part come into close proximity or contact. It can be obtained by winding it in a spiral shape and heating and melting the synthetic resin coating layer to bond them together. At this time, a synthetic resin flat belt made of the same material in a semi-molten state is used as the pipe wall. By spirally winding on the week surface of (1), the synthetic resin coating layer is melted by this semi-molten synthetic resin flat band without melting the synthetic resin coating layer, and integrated after cooling. It is possible to form a tubular wall.

(3) is a metal spiral ridge having a thickness of about 0.1 to 1.0 formed by spirally winding the outer peripheral surface of the pipe wall (1) at a constant pitch, and is formed in a gate-shaped cross section. At the same time, the lower ends of both side plate portions (14) (14) connected to both ends of the top surface (13) are formed as straight end portions (15) without forming flanges.

This metal spiral ridge (3) is curved at its straight end portion (15) into a circular shape so that it is on the inner diameter side, and at the same time, both straight end portions (15) are formed.
The end surface of the flat metal plate (2) is spirally wound on the adjacent plate surface of the flat metal plate (2) and is spirally wound around the outer peripheral surface of the pipe wall (1).

Further, a coating layer (5) made of the same resin as the resin material for the pipe wall (1) is layered on the outer peripheral surface of the metallic spiral ridge (3).

In this way, the pressure-resistant tube main body is formed by winding and integrating the metal screw-threaded protrusions (3) having the resin coating layer (5) on the outer peripheral surface of the pipe wall (1). An outer tube (6) having the same structure as the tube wall (1) is integrally provided on the outer circumference to form a pressure resistant tube (A) having a flat outer peripheral surface.

Such an outer tube (6) has a flat metal plate (4) formed by entirely covering (10) the same resin as the tube wall (1) with the metal spiral projection (3).
It can be formed by erection between the top surfaces of the above and spirally winding them so that the opposite end surfaces are joined to each other, and the resins are welded and integrated.

FIG. 2 shows a pressure-resistant laminated pipe, in which the outer pipe (6) is formed on the outer peripheral surface of the pressure-resistant pipe (A), and both end edges are formed without flanges. ) Is wound and integrated, and the resin-coated flat metal plate (8) is spirally wound and integrated so that the opposite side end faces are joined to each other between the top faces of the metal spiral ridges (3a). It is a large-diameter pressure-resistant laminated tube in which the outer layer tube (7) is formed by forming the outer layer tube (7).

In such a pressure resistant laminated tube, the number of layers can be increased.

That is, as shown in FIG. 3, a resin-coated metallic spiral ridge (3a) whose both edges are flangeless formed on the outer peripheral surface of the pressure-resistant laminated tube in FIG. At the same time, the resin-coated flat strip metal plate (8) may be spirally wound and integrated between the top surfaces of the metal spiral ridges (3a) so that the opposite side end surfaces are joined.

[Effect of device]

As described above, according to the pressure resistant pipe of the present invention, since the flat metal plate (2) is embedded in the cylindrical synthetic resin pipe wall (1), the flat metal plate (2) is used for the pipe wall. The pressure resistance of (1) can be increased and the pipe wall (1) against earth pressure and other external forces.
Of course, it is possible to prevent the pipe from being damaged.
(1) The metal spiral ridge having a cross-section gate shape that is spirally wound and integrated on the top (3) does not have flanges on both inner edges, so it can be easily formed into a cross-section gate shape. Not only this, the metal spiral ridge (3) can be bent into a spiral shape easily and with a large degree of curvature, so that even a small-diameter pressure-resistant tube can be molded, and in addition, it can be bent. Since there is no possibility of deformation in a divergent shape, etc., it is possible to provide a highly accurate pressure-resistant tube structure.

Furthermore, the metal spiral ridges (3) can also be used against earth pressure and other loads.
Also, the flat metal plate (2) embedded in the pipe wall (1) can strongly withstand, and can be used for a long period of time.

In addition, the resin-coated flat strip metal plate (4) is spirally wound and integrated so that the opposite side end faces are joined to each other between the top faces of the metal spiral ridges (3) of the pressure-resistant pipe. Outer tube with flat surface
Since (6) is formed, when connecting the open ends of the pressure resistant pipes of a fixed length, a sleeve or the like can be fitted on the flat outer peripheral surface of the pressure resistant pipe to facilitate the joint, and ,
A metal spiral ridge (3a) having the same shape as or similar to the metal spiral ridge (3) is wound around the outer circumference of the outer pipe (6) and integrated to form an outer layer pipe (7). By this, a large-diameter pressure-resistant laminated tube having a larger pressure-resistant strength can be formed.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partial sectional view of the structure of a pressure resistant tube, and FIGS. 2 and 3 are partial sectional views of a laminated pressure resistant tube. (1)… Synthetic resin pipe wall, (2)… Flat metal plate, (3) (3a)… Metal screw threaded ridge, (4)… Plastic coated metal plate, (6)… Outer pipe ,
(7) ... Outer layer tube, (8) ... Resin-coated flat metal plate.

Claims (2)

[Scope of utility model registration request] 1. A cylindrical synthetic resin pipe wall (1) is spirally embedded with flat side metal plates (2) such that opposite side end surfaces are joined together, and the pipe wall (1) Metallic spiral ridges with a gate-shaped cross-section, both ends of which are flangeless on the outer peripheral surface (3)
Is wound and integrated, and further, the resin-coated flat metal plate (4) is spirally wound and integrated so that the opposite side end surfaces are joined to each other between the top surfaces of the metal spiral ridges (3). A pressure-resistant tube formed by forming an outer tube (6) with a flat outer peripheral surface. 2. An outer layer pipe (7) is formed by winding and integrally forming a metal spiral ridge (3a) having a gate-shaped cross-section with both ends being flangeless on the outer periphery of the pressure-resistant pipe according to the above claim. Then, a pressure-resistant laminated tube formed by spirally winding and integrating a resin-coated flat metal plate (8) between the opposite side end surfaces of the spiral spiral ridge (3a) made of metal so that the opposite side end surfaces are joined.