2011年2月第40卷
第3期
施工技术
CONSTRUCTION TECHNOLOGY
金塘大桥主通航孔斜拉桥合龙控制措施
吴运宏’，岳青’，朱利明’，黄晓航
（1.中铁大桥勘测设计院有限公司湖北武汉430050；2.中铁大桥局集团有限公司湖北武汉
430050
[摘要］金塘大桥主通航孔桥是一座双塔、双索面的钢箱梁斜拉桥，主跨620m，是目前我国海上跨径最大的斜拉桥，该桥采用无应力状态控制法进行施工监控，中、边跨合龙施工有一定难度，施工过程中斜拉索采用“一张到位"法控制，可以减少工作量缩短工期．对桥梁边、中跨合龙的控制理论和思路进行了论述重点介绍该桥边、中
跨合龙的施工步骤、时机选择、注意事项、操作组节和独特之处，【关键词】金塘大桥；斜拉桥；钢箱梁：无应力状态法：合龙
[中图分类号］U445
[文献标识码】A
[文章编号] 1002-8498(2011) 03-0015-03
ControlMeasuresforClosureConstructionof
JintangPrimaryFairwayBridge
Wu Yunhong',Yue Qing',Zhu Liming',Huang Xiaohang
( 1. China Zhongtie Major Bridge Reconnaissance & Design Institute Co. , Led. , Wuhan , Hubei 430050 , China;
2. Chine Zhongtie Major Bridge Engineering Group Co. , Lad. , Wuhan , Hubei 430050 ,China)
Abstract: Jintang Primary Fairway Bridge is a double-plane twin-pylon cable-stayed bridge with a steel box girder. The main span of the bridge is 620m , which is the longest main span cable-stayed bridge in the sea at present in China , and uses the stress-free control method in construction control. Some difficulties make it hard for closure construction of the side and main spans. Method of position with once tension is used in cable-stayed construction which can reduce work load and short construction period. This paper shows the control theory and method of the closure construction of the side and main spans , especially introduces the construction steps , the timing , matters need attention , operation details and peculiarities of the closure construction , hope that help to the closure construction of the similar bridges. Key words: Jintang Bridge; cable-stayed bridge; steel box girder; stress-free control method; closure
工程概况
金塘大桥主通航孔桥为主跨620m(77m+218m +620m+218m+77m）5跨连续半漂浮体系钢箱梁斜拉桥双向四车道桥面宽度30.1m，设计荷载为公路I级。该桥采用正交异性板流线形扁平钢箱梁箱梁高3.0m。全桥钢箱梁制作划分成8类梁段 93个节段。梁段间除顶板U肋采用高强度螺栓连接外其余板件均采用熔透对接焊的形式。斜拉索采用1670MPa级Φ7mm的平行钢丝索全桥共168 根。索塔为钻石形桥型布置如图1所示。
施工方案概述 2
金塘大桥主通航孔斜拉桥的钢箱梁架设分4个
阶段进行：(1)采用托架安装塔下5段钢箱梁：(2)在安收稿日期]2010-09-08
[作者简介】吴运宏,中铁大桥勘测设计院有限公司工程师江苏省
210032，电话: 13656048670,Email:
南京市高新区磐能路踏8号 unhong_wu@163.com
万方数据
77,218
620
图1桥型布置(单位：m)
Fig.1The bridge shape( unit: m)
218
15
装的钢箱梁上拼装菱形吊机并对称悬拼钢箱梁至最大双量臂208.25m状态：边跨77m钢箱梁采用支架法施工与悬拼梁段同步进行；③进行边跨合龙 ④中跨悬拼钢箱梁至最大单悬臂306.25m状态然后进行中跨合龙，
金塘大桥主通航孔斜拉桥主梁为钢箱梁在钢箱梁悬臂施工过程中其应力不作为控制因素。经计算分析综合考虑后确定实施斜拉索“一张到位”法控制即将斜拉索一次性张拉到成桥时的无应力长