摘要
厦漳跨海大桥北汊主桥为多跨连续半飘浮体系双塔双索面斜拉桥,主梁为扁平流线型封闭钢箱梁,全桥钢箱梁共划分为99节,其中墩顶区9节。经方案分析比选,选择活动支架辅助不变幅吊机架设该桥墩顶区钢箱梁。为达到支架活动变位操作简单、变形过程顺利,变形及承重状态安全,在桥塔墩顶区设置三角形活动支架,利用液压控制系统,通过上、下滑块实现支架变位;在其他墩顶区设置活动跳板梁,通过卷扬机和2套滑车组实现支架变位。为方便桥塔区架梁吊机转移,设置了1个长17m、高3.4m的架梁吊机底座。墩顶区梁段架设时,依次起吊梁段并顶推滑移到位,辅助墩及过渡墩顶梁段采用悬臂拼装方式安装。
The main bridge of the north bridge of Xiazhang Sea-Crossing Bridge is a multispan semi-floating system continuous cable-stayed bridge with double pylons and double cable planes. The main girder of the bridge employs the streamlined flat closed steel box girder that has totally 99 segments, of which 9 segments are arranged in the pier top areas. After analysis and comparison of the different erection schemes, it was determined that the scheme of erecting the steel box girder in the pier top areas, using the non-luffing cranes aided by the movable scaffold- ings should be applied. To achieve the simple operation of position changing of the scaffoldings and to ensure that the deformation process of the scaffoldings was smooth, the deformation and load-bearing conditions of the scaffoldings were safe, the movable triangle scaffoldings were arranged in the pylon pier top areas and the positioning changing of the scaffoldings was to be realized, using the hydraulic control system and the upper and lower sliding blocks. In the other pier top areas, the movable gangway beams were arranged and the position changing of the scaffoldings there was to be realized, using the winches and two sets of pulley blocks. To facilitate the shifting of the crane in the area of a pylon, a crane base that was 17 m long and 3.4 m high was installed. For the erection of the girder in the pylon pier top areas, the segments of the girder were successively lifted, pushed and slid in place while for the erection of the girder in the auxiliary and transition pier top areas, the segments were erected by the cantilever assembling method.
出处
《桥梁建设》
EI
CSCD
北大核心
2012年第5期109-113,共5页
Bridge Construction
关键词
斜拉桥
钢梁
箱形梁
活动支架
桥梁架设
施工方案
cable-stayed bridge
steel girder
box girder
movable scaffolding
bridge erection
construction scheme
