KR960000662B1 - Light metal pipes - Google Patents

Abstract

The metallic tube made of thin metallic plate, is applied for waterwork, drainage, cable enclosure pipe etc.. The metallic tube with high-strength and light-weight, comprises spirally-wound thin plate strip(2) having the inner surface(3), upper opening section and both side surfaces(4, 4') elongated from the inner surface. The strips(2) are welded together at the side surface. The cylindrical tube(7) is inserted to the inner/outer sides of the strip(2) and separated from the cylindrical tube(7) with a certain distance.

Description

Lightweight metal pipe

1 is a perspective view of a lightweight metal tube according to a first embodiment of the present invention.

2 is a top cross-sectional view of FIG.

3 is a cross-sectional view of the lightweight metal tube according to the second embodiment of the present invention.

4 is a perspective view of a lightweight metal tube according to a third embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Light weight metal pipe 2: Metal thin plate

3: inside 4,4 ': side

5: outer surface 7: cylindrical tube

The present invention relates to a pipe used for water pipes, sewage pipes and cable laying pipes, in particular, because it is made of a metal thin plate and relates to a light-weight metal pipe that can be used for multi-purpose due to its light weight and high strength.

In general, metal pipes such as cast iron pipes, steel pipes, and stainless steel pipes have excellent pressure resistance, but due to the high cost of materials, the use range is extremely limited due to high price, and the weight is heavy during installation, which requires a lot of time and effort. In order to manufacture and arrange a separate curved pipe, the installation time and installation cost are increased, and the manufacturing facilities have to be changed according to the diameter of the pipe. In particular, a huge cost and equipment are required to manufacture a large pipe having a large diameter. There is a problem. In addition, synthetic resin pipes have better corrosion resistance than metal pipes, but they cannot be used in places subject to high pressure because they are not resistant to pressure, and they are more susceptible to load when manufactured in large pipes. It is not economical because a large amount of synthetic resin is needed because it needs to be thick, and the synthetic resin pipe is difficult to weld, and the sealing work of the connection part of the large synthetic resin pipe is impossible, so it can only be used for sewage pipe and large equipment for manufacturing large synthetic resin pipe. There is a problem that is required.

In order to improve the pressure resistance of a synthetic resin pipe, Korean Patent Registration No. 28931 suggests reinforcing strength by embedding a metal thin plate in a synthetic resin pipe. However, since the main material is also a synthetic resin, where high pressure resistance is required in principle, It cannot be used, and it is impossible to connect the pipe by welding, so it is impossible to completely seal the connection part, and it becomes more vulnerable to the load toward the large pipe, so it is uneconomical, and in this case it is difficult to bear the weight of the pipe itself. There is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems of conventional pipes, and to provide a lightweight metal pipe having a light pressure strength that is almost the same as that of a conventional metal pipe while being light in weight and making it easy to carry out piping work.

It is still another object of the present invention to provide a lightweight metal pipe that can easily manufacture a large pipe having excellent pressure resistance without requiring any additional equipment or cost.

It is still another object of the present invention to provide a lightweight metal pipe suitable for curved piping by having flexibility within a certain range.

This object of the present invention is achieved by providing a lightweight metal tube according to the present invention manufactured by welding a metal sheet of an object bent into a certain shape.

Light metal pipe according to the present invention will be clearly understood by the embodiments described in detail below with reference to the accompanying drawings.

1 and 2 are a perspective view and an upper sectional view of a first embodiment of a lightweight metal tube 1 according to the present invention, wherein the metal thin plate 2 has an inner surface 3, a side surface 4, 4 ', ″ Consisting of bends 8 Has a ″ shaped cross section. The metal thin plate 2 is spirally wound, and the wound metal thin plate 2 is a structure in which the welded portions 6 of the opposite side portions 4 and 4 'are continuously welded in a spiral manner. In this embodiment, the bent portion is welded, but only the inner surface or the inner portion and the bent portion may be welded together. The lightweight metal tube according to the present invention has a shape in which the inner surface 3 of the metal thin plate has a shape continuously connected to each other, and the inner surface thereof is smooth. Even if used, it is able to withstand a sufficiently large internal pressure.

In addition, in the first embodiment of the present invention, since the outer surface 5 is removed while the pressure resistance is almost the same, the winding of the metal thin plate 2 is easy, so that the work efficiency is improved and the material cost is reduced. In addition, since the outer surface 5 is removed from the lightweight metal tube of the first embodiment, the treatment between the open outer side wall as shown by the dashed line allows the contraction to be finely possible, and thus the arrangement of the curve is also excellent. There is an advantage.

3 is a cross-sectional view of the lightweight metal tube according to the second embodiment of the present invention, the cylindrical tube (7) is inserted into the interior of the lightweight metal tube (1) having the same structure as the first embodiment more completely the airtightness of the tube Structure to ensure. The cylindrical tube 7 may be a metal tube or a synthetic resin tube can be used and the cylindrical tube 7 may be inserted into both the outside or inside and outside of the lightweight metal tube (1).

FIG. 5 is a perspective view of a lightweight metal tube according to a fourth embodiment, in which the metal thin plate 2 is spirally wound on a cylindrical tube 7, wound and spaced apart from each other at a predetermined interval, and welded to the metal tube or the synthetic resin tube. Both can be used.

The lightweight metal tube according to the present invention having such a structure is manufactured by bending the metal thin plate, so that the pressure resistance of the tube is almost the same as that of the existing metal tube, and the weight of the tube is lighter. By reducing the height of the side of the light-weight metal pipe, it is easy to manufacture a large pipe having a relatively large diameter with sufficient pressure resistance, thereby making it possible to manufacture a large pipe economically, and to perform a curved pipe work easily. In addition to this, there is an excellent effect that the manufacturing cost of the metal tube is very low.

Claims (3)

Spirally wound up the metal plate (2) having an inner surface (3) and both sides (4, 4 ') whose ends are bent inwardly and extending from the inner surface and open at the top, and the wound of the wound metal sheet (2) Light metal pipe, characterized in that the opposite side (4) or a portion thereof is continuously welded to each other. Light metal tube according to claim 1, characterized in that a cylindrical tube (7) is inserted inside or outside of the metal thin plate (2). The light metal pipe according to claim 2, wherein the metal thin plate (2) is wound and welded on the cylindrical pipe (7) at a predetermined interval.