大跨度斜拉桥钢箱桁梁架设关键技术研究-《高速铁路技术》

文章信息/Info

Title:: Study on Key Technology for the Erection of Steel Box Truss Girder of Long-span Cable-stayed Bridge

Author(s):: GUO Xingliang; China Railway No. 3 Engineering Group Co., Ltd., Taiyuan 030001, China

Keywords:: large span|cable-stayed bridge|steel box truss girder|girder-erecting machine|erection|measurement

摘要:: 商合杭铁路裕溪河特大桥主桥为(60+120+324+120+60) m双塔钢箱桁梁斜拉桥,是目前国内350km/h高速铁路最大跨度的钢箱桁梁斜拉桥,施工技术难度极大。本文针对钢箱桁梁的结构特点,根据桥址现场施工条件,通过方案比选,首次提出了"边辅跨顶推、中跨悬拼、跨中合龙、钢箱梁与钢桁梁同步安装、塔梁同步"的钢箱桁梁架设技术;研制了具有"竖向起吊、纵向倒运"功能的经济型桥面吊机;提出了"激光跟踪、纵向调位、中线精调、标高调位"的测量定位方法,实现了钢箱桁梁的快速精确测量定位。实践证明,本文提出的钢箱桁梁架设关键技术合理,可为大跨度钢箱桁梁及类似梁型的架设施工提供借鉴。

Abstract:: The main bridge of the Yuxi River Super Major Bridge of Shangqiu-Hefei-Hangzhou High-speed Railway, (60+120+324+120+60) m in length, is a cable-stayed bridge of steel box truss girder with two towers. It is the cable-stayed bridge of steel box truss girder of the maximum span for 350 km/h high-speed railway in China at present, and the construction technology is extremely difficult. According to the structural characteristics of steel box truss girder and the site construction conditions of the bridge site, this paper proposes the erection technology of steel box truss girder for the first time through the comparison and selection of schemes, which includes the incremental launching of side and auxiliary spans, mid-span cantilever splicing, mid-span closure, synchronous installation of steel box girder and steel truss girder, and synchronous installation of tower girder; an economical bridge crane with the function of "vertical lifting and longitudinal reversing" was developed; the measurement and positioning method of "laser tracking, longitudinal position adjustment, centerline fine adjustment, and elevation adjustment" is put forward, and the rapid and accurate measurement and positioning of steel box truss girder are realized. The practice has proved that the key technology of steel box truss girder erection proposed in this paper is reasonable, which can provide a reference for the erection of large-span steel box truss girders and similar girder types.