济南齐鲁黄河大桥网状吊杆系杆拱桥施工关键技术  

Key Construction Techniques for Network Tied Arch Bridge of Qilu Huanghe River Bridge in Jinan

作　　者：王伟 唐茂林[2] 赵世超 李翠娟[2] 崔学涛[3] WANG Wei;TANG Maolin;ZHAO Shichao;LI Cuijuan;CUI Xuetao(Jinan City Construction Group,Jinan 250033,China;Southwest Jiaotong University,Chengdu 610031,China;CCCC Second Highway Engineering Co.,Ltd.,Xi′an 710065,China)

机构地区：[1]济南城市建设集团有限公司,山东济南250033 [2]西南交通大学,四川成都610031 [3]中交第二公路工程局有限公司,陕西西安710065

出　　处：《世界桥梁》2024年第4期22-28,共7页World Bridges

基　　金：国家自然科学基金项目(51308466);中央高校基本科研业务费专项项目(SWJTU12BR033,2682015CX084)。

摘　　要：济南齐鲁黄河大桥主桥为(95+280) m+420 m+(280+95) m五跨三连拱下承式网状吊杆系杆拱桥,主梁采用钢-混组合梁,梁宽60.7 m,采用“先梁后拱”的施工工艺。钢箱梁采用“静动结合”的吊装技术,解决了有限作业空间下超重、超宽钢箱梁节段上桥的难题,钢箱梁采用智能化步履式顶推设备与坦克轮相结合的方式顶推施工,提高了顶推过程的可控性、安全性和高效性。3跨拱肋中2个280 m跨采用满堂支架法施工,420 m跨采用“三段法”施工,即通过满堂支架法安装两端60 m边拱肋,300 m中拱段采用在钢箱梁上低位拼装,然后整体提升中拱段,使其与边拱肋配切合龙。对吊杆张拉方案进行对比,基于有限元分析,以吊杆内力控制为原则,最终选择吊杆应力水平更低的从跨中向拱脚对称张拉的吊杆张拉方案,张拉过程中采用接长杆减少张拉工作量,使吊杆张拉更高效、安全。The main bridge of Qilu Huanghe River Bridge in Jinan is a network tied arch bridge that consists of three continuous arch spans of 420 m,flanged by an expansion unit of two spans of 280 and 90 m on each side,with the deck width reaching 60.7 m.The stiffening girder is composed of steel boxes that were erected by using a combined static and dynamic method,and ahead of the construction of the arches,accomplishing the erection of steel box girders in limited space and the placement of extra wide steel box girders.The incremental launching of the steel box girders was performed using the intelligent crawler launching equipment and tank wheels,to enhance the controllability,security and efficiency of the incremental launching process.The stiffening girder in the two spans of 280 m was cast in situ on full scaffolding.Each arch spanning 420 m was divided into three sections to facilitate construction,the end 60 m-long sections were installed on the full scaffolding,the 300 m-long intermediate section was assembled on the previously-installed steel box girders and lifted integrally to connect with the side sections to achieve the closure of the arch via matching and cutting operation.In accordance with the finite element analysis and taking the internal forces of hangers as control,the hangers with lower stress level at the midspan were tensioned first,and the tensioning was proceeded towards the arch springs.During the hanger tensioning,extension rods were used to reduce the tensioning work and improve the tensioning efficiency and security.

关 键 词：系杆拱桥 网状吊杆 先梁后拱 步履式顶推 三段法 吊杆张拉 施工技术 

分 类 号：U448.225[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]