特大跨度自锚式悬索桥主缆系统防护体系设计  

Design of Protection System for Main Cable System of the Overlong-span Self-anchored Suspension Bridge

作　　者：孟祥勇 李春燕 张胡芝 MENG Xiangyong;LI Chunyan;ZHANG Huzhi

机构地区：[1]四川西南交大土木工程设计有限公司,四川成都610031

出　　处：《城市道桥与防洪》2023年第3期72-75,M0009,共5页Urban Roads Bridges & Flood Control

摘　　要：以云龙湾大桥主桥为背景,系统介绍了(30+80+205+80+30)m双塔自锚式悬索桥主缆系统防护体系设计情况。大桥共设置2根主缆,竖直平行索面[1]。单根主缆由27股索股组成,每股索股包含91丝高强镀锌铝合金平行钢丝。通过对国内悬索桥主缆防护体系应用现状调研分析,设计采用在传统缠丝涂装防护体系基础上,增加主缆除湿系统进行主缆防护,于缆内持续循环通入干燥空气,以保证运营阶段大桥主缆耐久性。同时对主缆相应配件进行防腐设计,并为方便检修,在主缆顶面设检修道。通过防护体系、检修措施的设计,保证了主缆的长久耐用,可为悬索桥相关设计提供一定参考。Based on the background of the main bridge of Yunlongwan Bridge,the design of the protection system for the main cable system of the double-pylon self-anchored suspension bridge with the(30+80+205+80+30)m span layout are systematically introduced.There are two main cables in parallel vertical planes designed to this bridge.Each cable consists of 27 strands,and each strand contains 91 wires of high-strength galvanized aluminum alloy parallel steel wire.By the investigation and analysis of the application of the main cable protection system of suspension bridges in China,the desiccant system of the main cable is added to protect the main cable on the basis of traditional wire wrapping and coating protection system,which blows the dry air into the main cable continuously and circularly to ensure the durability of the main cable of the bridge in operation stage.At the same time,the anti-corrosion measures are designed for the corresponding accessories of the main cable,and for the convenience of maintenance,the path for inspecting and repairing is set on the top of the main cable.The design of the protection system and maintenance measures guarantees the permanent durability of the main cable,which can provide some references for the design of the similar suspension bridges.

关 键 词：双塔自锚式悬索桥 主缆 防护体系 除湿系统 检修道 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]