自锚式悬索桥上部结构施工工艺优化及应用  

Optimization and application of construction technology for the upper structure of self-anchored suspension bridges

作　　者：王俊伟 顾雄淇 WANG Jun-wei;GU Xiong-qi(No.2 Engineering Co.,Ltd.of CCCC First Harbor Engineering Co.,Ltd.,Qingdao,Shandong 266071,China)

机构地区：[1]中交一航局第二工程有限公司,山东青岛266071

出　　处：《中国港湾建设》2024年第5期93-97,共5页China Harbour Engineering

摘　　要：南浔大桥为双塔双索自锚式悬索桥,上跨长湖申三级航道,跨径(3+45+100+45+3)m。为了消除自锚式悬索桥临时地锚在软弱地基中的施工风险,将缆索吊机节段安装钢梁节段,优化为少支架法大节段钢梁安装,取消临时锚碇和临时索股。采用先梁后缆工艺,利用主跨纵向钢梁轴向水平力,平衡主缆水平分力,缆索、端横梁及纵向钢箱梁自成受力稳定体系,主缆架设及吊杆张拉施工程序简单,索股线型准确,提高了缆索系统的安装精度,节约了临时锚碇及临时索股的工程造价,缩短了施工工期。Nanxun Bridge is a self-anchored suspension bridge with double towers and double cables.It spans the classⅢwaterway of Changhushen with a span of(3+45+100+45+3)m.In order to eliminate the construction risk of temporary ground anchors of self-anchored suspension bridges in soft foundations,the segmental installation of steel girders by cable cranes is optimized to the large segmental installation of steel girders by less support method,and temporary anchoring and temporary cable strands are eliminated.The girder before cable technology is adopted,the horizontal force of the main cable is balanced by the axial horizontal force of the longitudinal steel girder of the main span,and the cable,end cross beam and longitudinal steel box girder are self-stabilized by the stress system.The construction procedure of the main cable erection and derrick tension is simple,and the cable strands are accurate,which improves the installation accuracy of the cable system,saves the engineering cost of temporary anchorage and temporary cable strands,and shortens the construction period.

关 键 词：双塔双索 自锚式悬索桥 临时锚碇 轴向水平力 主缆架设 

分 类 号：U655.4[交通运输工程—港口、海岸及近海工程] U448.25[交通运输工程—船舶与海洋工程]