Double-wall winding pipe made of high density polyethylene steel strips

Abstract

The invention relates to a double-wall winding pipe made of high density polyethylene coated steel strips. The pipe is formed by spirally winding a steel plastic plate in a shape like a Chinese character hui and a straight steel strip and coating and welding by using a hot melt adhesive, wherein the straight steel strip is embedded into the steel plastic plate in the shape like the Chinese character hui. In the double-wall winding pipe made of the high density polyethylene steel strips, the steel strips are embedded into two sides in a plate strip, the inner and outer layers of a pipe wall are coated by plastic, the plate strip is wound and welded on a pipeline forming machine to form a pipeline, and a welding technology is an international advanced end face heating welding technology, so that the probability that a welding seam is radially cracked simultaneously is more effectively avoided while the unreliability of single-layer welding is avoided; meanwhile, the pipe has the advantages of high ring stiffness, simple manufacturing equipment and the like.

Description

technical field [0001] The present invention relates to urban drainage pipe equipment, in particular to a double-wall winding pipe made of high density polyethylene (High Density Polyethylene, "HDPE") steel strip. Background technique [0002] According to the census of urban municipal public facilities in my country, urban drainage pipes are currently being used, and their pipe materials are mainly concrete pipes (cement pipes), cast iron pipes, ceramic pipes, steel pipes and plastic pipes (PVC, PE single-wall corrugated pipes, Double-wall corrugated pipe and winding structure wall pipe) two generations of pipes. Among them, steel pipes, cast iron pipes, clay pipes and cement pipes are all rigid pipes, which are the first generation of drainage pipes, and plastic pipes are the second generation of drainage pipes, which are typical flexible pipes. [0003] The first generation of drainage pipes can meet the requirements of rigidity, that is, ring stiffness, and the price is ...

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Problems solved by technology

[0003] The first generation of drainage pipes can meet the requirements of rigidity, that is, ring stiffness, and the price is relatively low, but it has problems such as poor corrosion resistance, short life, and easy leakage of joints.

[0004] For the second-generation drainage pipe, it has the advantages of corrosion resistance and light weight, but the strength (ring stiffness) of the plastic pipe is insufficient, and the cost performance is low.

[0005] At present, the most commonly used in various drainage pipes is the winding pipe (the third generation drainage pipe). This kind of pipe has the advantages of corrosion resistance, good toughness, combination of rigidity and flexibility, and easy installation. However, there are still many problems in this winding pipe. For example, the strength is low, encountering solid stones, metal collision and extrusion, easy to cause pits, until perforation

[0006] In recent years, countries all over the world are scrambling to study plastic pipes reinforced with strip steel. The typical one is the spiral steel-plastic drainage pipe with corrugated outer surface. However, because of its unreasonable structure, the thickness of the pipe wall varies greatly, so the strength Uneven, with weak links

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