Spiral winding composite underground pipeline

Abstract

The invention relates to a spiral winding composite underground pipeline which comprises an inner layer pipeline, a reinforcing layer and an outer layer pipeline, wherein the inner layer pipeline comprises a UPVC base pipe, a sealing structure and at least a group of clamping structures, wherein the UPVC base pipe winds and extends spirally along a first spiral line, the sealing structure is arranged between adjacent two side surfaces along the first spiral line in the UPVC base pipe, such that the inner layer pipeline forms a sealed space extending continuously along the first axis, the clamping structure comprises a first fit portion and a second fit portion which are located on adjacent two sides of the first spiral line in the UPVC base pipe and are clamped to each other; the reinforcing layer comprises a plurality of steel strips which at least cover the clamping structure; the outer layer pipeline extends continuously along the first axis, and is configured as a reinforced concrete pipe poured to the outer surface of the reinforcing layer and the inner layer pipeline exposed out of the outer surface of the reinforcing layer; the inner layer pipeline is corrosion-resistant, such that the service life is longer; the reinforcing layer improves the structural strength and stability, and the ring rigidity reaches SN12.5; the reinforced concrete pipe enables a higher outer pressure bearing capacity, such that the spiral winding composite underground pipeline with a ultra large diameter 3-6 m is formed.

Description

technical field [0001] The invention relates to the technical field of pipelines, in particular to a helically wound composite underground pipeline. Background technique [0002] Gravity drainage pipes do not require external pressure and only rely on gravity self-flow drainage on the slope of the drainage pipes. It has the advantages of long-term use, small maintenance and overhaul, economical and environmental protection, etc., and is widely used in water supply and drainage systems, farmland water conservancy irrigation, mines and Chemical drainage and other underground pipe networks. [0003] At present, gravity drainage pipes mainly include ductile iron pipes, glass fiber reinforced plastic sand pipes, reinforced concrete pipes, PVC (Polyvinyl chloride, polyvinyl chloride) spirally wound pipes, etc. Among them, glass fiber reinforced plastic sand pipes and reinforced concrete pipes occupy a large diameter (diameter More than 1000mm) the vast majority of the gravity dra...

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Problems solved by technology

[0003] At present, gravity drainage pipes mainly include ductile iron pipes, glass fiber reinforced plastic sand pipes, reinforced concrete pipes, PVC (Polyvinyl chloride, polyvinyl chloride) spirally wound pipes, etc. Among them, glass fiber reinforced plastic sand pipes and reinforced concrete pipes occupy a large diameter (diameter More than 1000mm) the vast majority of the gravity drainage pipe market, and the majority of the remaining PVC spiral wound pipe diameter is set below 1200mm, and there are few practical applications, but the existing ultra-large diameter gravity drainage pipes with a diameter of more than 3500mm Because of the cumbersome preparation process, difficult transportation and installation, and high cost, there are almost no manufacturers to produce it, and the existing ductile iron pipes have extremely poor corrosion resistance in sewage, chemical drainage and other environments, and serious problems will occur after more than ten years of use. Corrosion or even perforation will affect the safety of pipelines; FRP sand-filled pipes require the use of medium sand for landfill, once leakage occurs, it will easily cause groundwater and soil loss, surface subsidence, and cause safety accidents; reinforced concrete pipes have poor permeability resistance, and corrosive media such as hydrogen sulfide It is easy to penetrate into the interior of the reinforced concrete pipe wall, causing the steel bar to corrode and become brittle, and there is a risk of pipe collapse; as the caliber increases, the ring stiffness of the UPVC spiral pipe decreases, and the self-supporting capacity is poor, which affects its popularization and application, and increases Risk of leakage when splicing

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