悬索桥主缆除湿的内部送气管道设计与性能

doi:10.13229/j.cnki.jdxbgxb20200508

Abstract

Abstract:

In order to meet the requirements for use inside the main cables of suspension bridges， a dry air supply conduit structure with good compressive and extension properties is designed， and the compressive properties and air supply resistance characteristics of the air supply conduit are studied by numerical simulation and experimental testing. The results show that the composite air supply conduit composed of the 304L stainless steel spring with an inner diameter of 50 mm， wire diameter of 5 mm， pitch of 15~20 mm and the corrugated pipe can withstand the radial compressive stress of 13.4 MPa， thus meeting the compressive strength requirements. The air delivery resistance coefficient of the composite conduit composed of the spring and the corrugated pipe is significantly smaller than that of the pure spring conduit， with a maximum reduction of 46.4%， which means that the composite air supply conduit can effectively reduce the pressure loss in the process of dry air delivery.

Key words: bridge engineering, the dehumidification system of the main cable, the internal ventilation, the air supply conduit, the radial compressive properties, resistance coefficient

CLC Number:

U443.8

Wei CHEN,Tian-bao WAN,Zhong-bin WANG,Xuan LI,Rui-li SHEN. Design and performance of internal air supply conduit for dehumidification in main cables of suspension bridges[J].Journal of Jilin University(Engineering and Technology Edition), 2021, 51(5): 1749-1755.

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簧丝线径/mm	螺距/mm	最大变形量/mm	应力/MPa	稳定系数
3	10	5.78	1012	1.59
3	15	7.90	1210	1.17
5	15	1.31	421	6.75
5	20	1.72	566	5.11

Design and performance of internal air supply conduit for dehumidification in main cables of suspension bridges

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