石首长江公路大桥北边跨主梁施工关键技术  

Key Techniques for Construction of Main Girder of North Side Spans of Shishou Changjiang River Highway Bridge

作　　者：赵健 王元清[1] 宋伟俊 黄敏 朱永盛 ZHAO Jian;WANG Yuan-qing;SONG Wei-jun;HUANG Min;ZHU Yong-sheng(Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education,Tsinghua University Beijing 100084,China;China CRCC Major Bridge Engineering Group Co.,Ltd.,Tianjin 300300,China;China Railway Bridge Science Research Institute,Ltd.,Wuhan 430034,China)

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]中国铁建大桥工程局集团有限公司,天津300300 [3]中铁大桥科学研究院有限公司,湖北武汉430034

出　　处：《桥梁建设》2018年第4期102-107,共6页Bridge Construction

基　　金：中国铁建股份有限公司科技开发项目(16-C09);中国铁建股份有限公司重大科技专项项目(18-A03)~~

摘　　要：石首长江公路大桥主桥为主跨820m的双塔非对称混合梁斜拉桥,大桥中跨与南边跨主梁采用PK断面钢箱梁结构,北边跨主梁采用PK断面预应力混凝土箱梁结构(长251.5m)。受粉细砂地质条件影响,大桥北边跨主梁采用"1+1桥位短线法"进行工厂化预制、胶拼施工。施工时,首先采用大型组合式移动模板进行预应力混凝土箱梁节段预制施工,然后利用1 100t特种龙门吊机将箱梁节段提升至墩顶滑移支架,最后进行预应力混凝土箱梁节段匹配、胶拼,并张拉纵向预应力钢筋进行体系转换,完成北边跨主梁施工。The main bridge of Shishou Changjiang River Highway Bridge is a double-pylon asymmetric hybrid girder cable-stayed bridge with the main span of 820 m.The main girder of the main span and the south side spans of the bridge is the steel box girder of the Pasco-Kennewick（PK）Bridge section while that of the north side spans is the prestressed concrete box girder（251.5 min length）also of the PK section.Affected by the geological conditions of the fine silty sand at the bridge site,the segments of the main girder of the north side spans were precast in a factory production way,using the 1＋1 bridge site short-line match method and were assembled and connected,using the epoxy resin.In the construction,the segments of the prestressed concrete box girder were firstly precast,using the large-size combined slide shuttering,were then lifted onto the launching truss on the piers,using the 1 100 tspecial gantry crane and were matched,assembled and connected,using the epoxy resin.Finally,the longitudinal prestressing bars of the girder were tensioned and the system transferring was carried out.At this stage,the construction of the main girder of the north side spans was completed.

关 键 词：斜拉桥 公路桥 预应力混凝土梁 PK断面箱梁 1+1桥位短线法 桥梁施工 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]