Rebar reinforced polypropylene corrugated pipe and manufacturing method thereof

A technology of threaded steel bars and corrugated pipes, applied in the field of threaded steel bar reinforced polypropylene bellows pipes and its manufacture, can solve the problems of easy delamination of steel and plastic, poor impact performance, corrosion of steel strips, etc., and achieve enhanced synergistic compression resistance and Mutual protection, avoidance of differences in expansion coefficient and shrinkage, effect of excellent compressive strength

A technology of threaded steel bars and corrugated pipes, applied in the field of threaded steel bar reinforced polypropylene bellows pipes and its manufacture, can solve the problems of easy delamination of steel and plastic, poor impact performance, corrosion of steel strips, etc., and achieve enhanced synergistic compression resistance and Mutual protection, avoidance of differences in expansion coefficient and shrinkage, effect of excellent compressive strength

CN108407345APending Publication Date: 2018-08-17ANHUI SHENGCHENYUAN MATERIAL TECH IND DEV CO LTD
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  • Rebar reinforced polypropylene corrugated pipe and manufacturing method thereof
  • Rebar reinforced polypropylene corrugated pipe and manufacturing method thereof
  • Rebar reinforced polypropylene corrugated pipe and manufacturing method thereof

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Experimental program
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specific Embodiment approach ( 1

[0032] Such as Figure 1-4 Shown is a threaded steel reinforced polypropylene corrugated pipe provided by the present invention, which is characterized in that the corrugated pipe includes an outer layer 1, a reinforced layer 2, and a plastic-coated steel bar layer 3 arranged in the reinforced layer 2, the outer layer 1 includes outer layer crests 11 and outer layer troughs 12 arranged alternately and extending helically along the axial direction of the bellows, the inner surface of the outer layer crests 11 is a spiral cavity, and the reinforcing layer 2 is a solid crest structure and extend spirally along the axial direction of the bellows, the reinforcement layer 2 is located in the spiral cavity, the outer surface of the reinforcement layer 2 is attached and fixed to the inner surface of the outer wave peak 11 and the inner surface of the reinforcement layer 2 flush with the inner surface of the outer layer trough 12, the cross-sectional area of ​​the plastic-coated steel ...

specific Embodiment approach ( 2

[0037] A method for manufacturing corrugated polypropylene pipe reinforced with threaded steel bars, characterized in that: the method comprises the following steps:

[0038] ①Heat the straight-line threaded steel bars to control the surface temperature at 250°C-280°C, and at the same time melt the grafted modified polyolefin resin at 180°C-220°C; then melt the grafted The modified polyolefin resin is evenly applied on the surface of the linear threaded steel bar profile, and the thickness of the coating is controlled at 0.8mm to 1.2mm. After cooling, the grafted modified polyolefin resin is cured on the surface of the linear threaded steel bar profile and tightly bonded. , to obtain a linear plastic-coated reinforcement layer;

[0039] ②When performing step ①, melt the polypropylene material used to make the reinforcement layer 2 at the same time, and control the melting temperature at 180°C to 250°C. Introduce and fix the plastic-coated linear threaded steel bar in step ① in...

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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...

Claims

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Application Information

Patent Timeline
17 Aug 2018
Publication
CN108407345A
IPC
B29D23/00; F16L9/147
CPC
F16L9/147; B29D23/001
Inventors
周成立