High toughness sheath for unbonded steel strand and extrusion process thereof

CN117702519BActive Publication Date: 2026-07-24TIANJIN METALLURGICAL GRP ZHONGXING SHENGDA STEEL CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN METALLURGICAL GRP ZHONGXING SHENGDA STEEL CO LTD
Filing Date
2023-12-15
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing unbonded prestressed steel strands have problems such as strand breakage, reduced pretension force, and high construction difficulty in nuclear power engineering. Moreover, the performance of existing sheath products cannot meet the requirements of high strength, high plasticity, and high toughness.

Method used

Using HDPE materials with specific formulations (HDPE YGH041T, HDPE 5000S and HDPE 049) and optimized extrusion processing methods, including drying, heating, oiling and cooling processes, a sheath with a thickness of 1.5-2.0 mm is formed to meet the performance indicators of nuclear power engineering.

Benefits of technology

It achieves high strength, high plasticity and high toughness of unbonded steel strand sheath, meets the service life requirements of nuclear power projects, reduces construction difficulty and extends project life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to a kind of high toughness sheath of unbonded steel strand and its extrusion processing method, the raw material formula of sheath is according to the component of each weight ratio: HDPE YGH041T 65%~66%, HDPE 5000S and HDPE 049 32%~33%, color mother 1.7%~2.1%;Wherein the weight of HDPE 5000S and HDPE 049 is 1:1;Method includes: after being mixed uniformly, the raw material is dried;The dried raw material is transported to heating cylinder, and continuously heated in the heating cylinder during conveying process;Raw material is transported to extrusion mold in the end of heating cylinder, and raw material is formed on bare steel strand by extrusion mold coating, to form sheath;The steel strand coated with sheath output from extrusion mold output port enters subsequent cooling water and is cooled, and after cooling, it is reeled, and the extrusion processing process of sheath is completed.The product of the present application meets the high strength, high plasticity and high toughness index requirements used in nuclear power engineering.
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