46
DOI;10.7672/sgjs2017020046
施工技术
CONSTRUCTIONTECHNOLOGY
2017年1月下第46卷第2期
宜昌庙嘴长江大桥连续式猫道整体线形调整技术
谢红跃
（中铁大桥局集团有限公司，湖北武汉430050）
【摘要】猫道系统是悬索桥上部结构施工最重要的临时工程，其线形直接关系到悬索桥上部结构施工的安全及便利程度。但由于猫道承重索预拉后的残余非弹性变形及受材料、结构荷载偏差等多种固素影响，施工中对连续式猫道线形控制较为围难。猫道整体架设完成后的线形与设计线形会有一定的偏差，很难达到预定效果，给施工安
全性和便利性带来不利影响。本文介绍了宜吕庙嘴长江大桥大江桥连续式猫道整体线形调整方法。【关键词】桥梁工程；悬索桥；猫道；线形；调整；施工技术
【文章编号】1002-8498(2017)02-0046-03
[中图分类号】U448
[文献标识码］A
TheOverallLinearAdjustment Technology of YangtzeRiverBridge
Continuous Catwalk in Yichang Miaozui
Xie Hongyue
(China Railway Major Bridge Engineering Group Co.,Lud.Wuhan,Hubei 430050,China)
Abstract:The catwalk system is the most important temporary project of the upper structure construction of suspension bridge, and its line shape is directly related to the safety and convenience of the superstructure construction of suspension bridge. Because of the catwalk-bearing cable pertensioning residual inelastic deformation, the influence of a variety of materials and the structure load deviation factor, the construction of continuous catwalk linear control is more difficult. The catwalk of the whole erection after the completion of the line and the designed line will have a certain deviation, it is difficult to achieve predetermined effect, which bring adverse effect to the construction safety and convenience. This paper introduces Yichang Miaozui Yangtze River Bridge continuous catwalk overall linear adjustment method.
Key words:bridges; suspension bridge; catwalks; linear; adjustment; construction
1工程概况 1.1桥梁概况
宜昌庙嘴长江大桥位于葛洲坝水利枢纽下游约2.7km，起于点军东岳二路止于西陵区西陵二路，连接主城区、西坝和点军新区，该桥主桥由大江桥和三江桥2部分组成，大江桥为主跨838m悬索桥[1-2]，桥式布置如图1所示，上部结构施工时采用
连续式猫道。 1.2猫道概况
本桥猫道由承重索、面层、栏杆及扶手索、门架系统、横向天桥、锚固连接和循环系统等构成[3]。单侧猫道承重索由6根Φ48钢丝绳组成，门架承重
【作者简介】谢红跃，高级工程师，一级注册建造师，E-mail： 690091201@qq.com
【收稿日期】2016-06-01 万方数据
点新区 TT
19-350-16010-38 a立面 b平面
图1桥式布置（单位：m）
Fig.1 Bridge layout(unit;m)
四题
索为2根Φ40钢丝绳，循环索为2根Φ36的钢丝绳，扶手索为2根Φ22的钢丝绳4}。猫道面层由2 层钢丝网组成，底层及侧网采用$5钢丝网，面层采用2钢丝网。猫道门架按照50m布置1个，全桥共布置54道。猫道不设抗风缆，为增加猫道的抗风稳定性，采用横向天桥增加上、下游猫道刚度，横向