吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (5): 1749-1755.doi: 10.13229/j.cnki.jdxbgxb20200508

• 交通运输工程·土木工程 • 上一篇    

悬索桥主缆除湿的内部送气管道设计与性能

陈巍1(),万田保2,王忠彬2,厉萱1,沈锐利1()   

  1. 1.西南交通大学 土木工程学院，成都 610031
    2.中铁大桥勘测设计院集团有限公司，武汉 430056
  • 收稿日期:2020-07-06 出版日期:2021-09-01 发布日期:2021-09-16
  • 通讯作者: 沈锐利 E-mail:782851112@qq.com;rlshen@163.com
  • 作者简介:陈巍（1991-），男，博士研究生.研究方向：大跨悬索桥防灾减灾与耐久性.E-mail：782851112@qq.com
  • 基金资助:
    江苏省交通运输科技项目(R110120H01172)

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

Wei CHEN1(),Tian-bao WAN2,Zhong-bin WANG2,Xuan LI1,Rui-li SHEN1()   

  1. 1.School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China
    2.China Railway Major Bridge Reconnaissance & Design Institute Co. ，Ltd. ，Wuhan 430056，China
  • Received:2020-07-06 Online:2021-09-01 Published:2021-09-16
  • Contact: Rui-li SHEN E-mail:782851112@qq.com;rlshen@163.com

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摘要：

为满足在悬索桥主缆内部使用要求，设计了一种抗压和延伸性能均较好的干空气送气管道结构，采用数值模拟和试验测试的方法对送气管道的抗压性能及送气阻力特性进行了研究。结果表明：内径为50 mm、线径为5 mm、螺距为15~20 mm的304L不锈钢弹簧和波纹管组成的复合式送气管道能承受13.4 MPa的径向压应力作用，满足抗压强度要求；由弹簧和波纹管组成的复合式管道的送气阻力系数显著小于纯弹簧管道，最大可减小46.4%，即复合式送气管道可有效降低干空气输送过程中的压力损失。

关键词: 桥梁工程, 主缆除湿系统, 内部送气, 送气管道, 抗压性能, 阻力系数

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

中图分类号: 

  • U443.8

图1

龙潭过江通道主桥主缆除湿系统总体布置图"

图2

主缆内部送气除湿系统工作流程"

图3

主缆内部湿度变化曲线"

图4

复合式送气管道设计示意图"

图5

有限元计算模型"

表1

弹簧抗压数值计算结果"

簧丝线径/mm螺距/mm最大变形量/mm应力/MPa稳定系数
3105.7810121.59
3157.9012101.17
5151.314216.75
5201.725665.11

图6

试验加载现场图"

表2

弹簧抗压测试工况表"

试件编号簧丝线径/mm螺距/mm荷载/kN
1310150
2315150
3515150
4515200
5520150
6520200

图7

5 mm簧丝线径试件测试结果"

图8

送气管道阻力测试结果"

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