Hollow-wall pipe and manufacturing method thereof

Abstract

The invention relates to the field of pipes, in particular to a hollow-wall pipe and a manufacturing method thereof. The hollow-wall pipe comprises an inner layer, an outer layer and a hollow reinforcement layer, wherein the hollow reinforcement layer is formed by spirally winding a straight profile between the inner layer and the outer layer; the straight profile comprises a square single-wall corrugated pipe and a wrapping layer; four walls of the square single-wall corrugated pipe are of a corrugated structure with crests and troughs alternating in sequence in the axial direction; the crestpositions and the trough positions of the four walls of the square single-wall corrugated pipe correspond to one another; the junctions of the four walls of the square single-wall corrugated pipe adopt round corners for transition connection; and the junction of each crest and the corresponding trough adopts a round corner for transition connection. The pipe is not prone to deforming under external force and high temperature, has more excellent pressure resistant strength and damage resistance as well as high rigidity; and according to the manufacturing method, the fusion strength is high, the phenomenon that a cold-state winding pipe is extremely prone to fracture is avoided, operation is simple and convenient, the process is stable and pipes with ultrahigh diameters can be produced at will.

Description

technical field [0001] The invention relates to the field of pipes, in particular to a hollow-wall pipe and a manufacturing method thereof. Background technique [0002] At present, the pipe materials in the field of drainage and sewage pipes are generally HDPE double-wall corrugated pipes or ordinary HDPE hollow-wall pipes, etc. Among them, HDPE double-wall corrugated pipes have the following disadvantages: 1. The material of HDPE double-wall corrugated pipes is relatively soft, and the bending modulus is low. It is about 800MPa, resulting in low rigidity of the pipe ring, generally 8KN / m 2 ;2. The surface of the pipe is corrugated, and the friction with the soil cannot be applied to the non-excavation construction field; 3. The strength of the joint of the pipe is poor, resulting in insufficient connection strength and easy leakage; 4. The flexibility of the pipe ring is poor. Crack occurs when the deformation reaches about 30% of the pipe diameter; 5. HDPE double-wall co...

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Problems solved by technology

[0002] At present, the pipe materials in the field of drainage and sewage pipes are generally HDPE double-wall corrugated pipes or ordinary HDPE hollow-wall pipes, etc. Among them, HDPE double-wall corrugated pipes have the following disadvantages: 1. The material of HDPE double-wall corrugated pipes is relatively soft, and the bending modulus is low. It is about 800MPa, resulting in low rigidity of the pipe ring, generally 8KN / m 2 ;2. The surface of the pipe is corrugated, and the friction with the soil cannot be applied to the non-excavation construction field; 3. The strength of the joint of the pipe is poor, resulting in insufficient connection strength and easy leakage; 4. The flexibility of the pipe ring is poor. Crack occurs when the deformation reaches about 30% of the pipe diameter; 5. HDPE double-wall corrugated pipes are generally small in diameter and cannot produce pipes exceeding DN1500mm, which cannot meet the market demand for large-diameter pipes

[0003] Ordinary HDPE hollow-wall pipes have the following disadvantages: 1. The pipes are spliced ​​together by a prefabricated solid-wall profile through reheating and adhesive. The solid-wall profile is in a cold state. Although it has been reheated, the welding strength is still poor. It is easy to cause longitudinal fracture of the pipe. At the same time, for this reason, the bending residual stress of the cold solid-walled profile is relatively large. During the later storage, transportation, installation and use of the pipe, stress release is easy to occur when the pipe is subjected to external force, thus causing the pipe to be damaged. , and because of the stress problem, it is not conducive to the long-term service life of the pipe; 2. The weight of the pipe is heavy, the cost is high, and the construction efficiency is poor; 3. The rigidity of the pipe ring is low, generally not exceeding 8KN / m 2 ; 4. The pipe has only two layers, the inner wall and the outer wall. Relatively speaking, the damage resistance is poor when it is impacted by an external force; 5. The pipe ring is poorly flexible, and generally ruptures when it is pressed to a deformation of about 30% of the pipe diameter

[0004] Generally speaking, the existing drainage and sewage pipes in the industry generally have the following problems: 1. The rigidity of the pipe ring is low; 2. The welding (or welding or composite) strength is poor; 3. The residual stress is large, especially cold. State-wound pipes, especially large-diameter pipes, cause the pipes to be damaged due to stress release when subjected to external forces in the later stage, and greatly shorten the service life of the pipes; 4. The weight of high-cost pipes is generally heavy, and the amount of materials used is large

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