Rebar reinforced polypropylene corrugated pipe and manufacturing method thereof

Abstract

The invention relates to the field of corrugated pipes, in particular to a rebar reinforced polypropylene corrugated pipe and a manufacturing method thereof. The corrugated pipe comprises an outer layer, a reinforced layer and a plastic coated rebar layer; the outer layer comprises outer-layer wave peaks and outer-layer wave valleys; the sectional area of the plastic coated rebar layer is 14-16% of the sectional area of the reinforced layer; and the plastic coated rebar layer is in a spiral shape, the reinforced layer is provided with a containing cavity, and the plastic coated rebar layer comprises rebars and a plastic coated layer. According to the rebar reinforced polypropylene corrugated pipe and the manufacturing method thereof, the outer-layer wave peaks of the corrugated pipe are internally provided with solid wave peak reinforced layers, and the reinforced layer is internally provided with a plastic coated rebar layer; thus, the corrugated pipe has more excellent compressive strength, in addition, the rebars and polypropylene plastic jointly achieve the reinforcing effect, the pipe is free of stress concentration points and is more uniformly stressed, and the service life is greatly prolonged; and according to the manufacturing method, the technology is stable and simple, the production speed is high, moreover, the welding strength is high, and the quality is stable.

Description

technical field [0001] The invention relates to the field of corrugated pipes, in particular to a threaded steel reinforced polypropylene corrugated pipe and a manufacturing method thereof. Background technique [0002] At present, the pipes in the fields of drainage and sewage are generally steel-plastic composite spiral corrugated pipes and HDPE double-wall corrugated pipes. Among them, the steel-plastic composite spiral corrugated pipes have the following disadvantages: 1. The adhesion between steel and plastic is poor. , there is a huge internal stress in the steel strip, which causes serious separation of steel and plastic due to factors such as thermal expansion and contraction after the pipe is placed outdoors for a certain period of time, resulting in a serious decrease in the ring stiffness of the pipe after it is buried , causing engineering accidents; 2. Due to the poor corrosion resistance of the steel strip, it is easy to cause corrosion of the steel strip durin...

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Problems solved by technology

[0002] At present, the pipes in the fields of drainage and sewage are generally steel-plastic composite spiral corrugated pipes and HDPE double-wall corrugated pipes. Among them, the steel-plastic composite spiral corrugated pipes have the following disadvantages: 1. The adhesion between steel and plastic is poor. , there is a huge internal stress in the steel strip, which causes serious separation of steel and plastic due to factors such as thermal expansion and contraction after the pipe is placed outdoors for a certain period of time, resulting in a serious decrease in the ring stiffness of the pipe after it is buried , causing engineering accidents; 2. Due to the poor corrosion resistance of the steel strip, it is easy to cause corrosion of the steel strip during production and construction, thereby damaging the pipe and causing engineering accidents; 3. The impact performance is poor, and the steel-plastic composite pipe is subjected to external forces. When impacted, steel and plastic are prone to delamination; 4. Poor damage resistance. The wave crest of the pipe is a single wave crest structure. As long as the wave crest is damaged by external force, water or foreign matter will enter the wave cavity, corrode the steel strip and damage the inner core. layer, eventually causing the overall damage of the pipe

[0003] HDPE double-wall corrugated pipe has the following disadvantages: 1. The peak of the pipe is a single-wave structure, while the inner and outer wall thickness is thin, and the impact resistance and damage resistance are poor; The performance is poor, so the overall ring stiffness is low, generally no more than 8kN / m 2 , if it is necessary to increase the ring stiffness, it is necessary to greatly increase the amount of unit material, and the cost is high; 3. The investment in production equipment is high, generally more than 8 times that of threaded bellows equipment. High cost; at the same time, due to technical limitations, it is currently impossible to produce pipes with a diameter exceeding 1500mm

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