摘要
澜沧江特大桥为上承式劲性骨架钢管混凝土铁路提篮拱桥,主跨计算跨径342 m,桥址处于V形深沟峡谷地带,相对高差达1 204 m。设计要求该桥采用转体法施工,半拱竖转下放重量达2 500 t,根据该桥特点及地形条件,提出整体竖转和二次竖转2种施工方案,经研究比选,该桥采用拱肋二次竖转施工方案,依山就势设置拼装支架,半边拱肋分2段拼装,2次竖转到位。二次竖转施工方案的关键施工技术有半拱中部的中间铰设置、第1次竖转水平力传递拉压杆结构及计算机动态同步控制负角度竖转技术。
Lancang River Bridge is a concrete-filled steel tube（CFST） steel frame reinforced concrete railway basket handle deck arch bridge with the calculated length of main span being 342 m.The bridge is located over the V-shape deep valley where the relative height difference is up to 1 204 m.According to the design,the arch ribs of the bridge were required to be erected by the vertical rotation method.The weight of the rotation and lowering of a half arch rib would be up to 2 500 t.In the light of the characteristics of the bridge and the topography conditions at the bridge site,two kinds of the constructions schemes of integral vertical rotation and two-time vertical rotation were proposed.Through comparison and selection,it was decided that the scheme of the two-time vertical rotation was to be adopted.The scaffoldings for assembling of the arch ribs were arranged on the mountain side,making a good use of the specific conditiions there,a half arch rib was assembled in two segments and to be rotated in place in two times.The key techniques of the adopted construction scheme included those of the intermediate hinge setting in the central part of the half arch,the strut-and-tie structure for horizontal force transferring in the first time rotation and the negative angle rotation that was dynamically and synchronously controlled by computers.
出处
《桥梁建设》
EI
CSCD
北大核心
2010年第3期79-82,共4页
Bridge Construction
关键词
澜沧江特大桥
铁路桥
拱桥
转体法架桥
二次竖转
桥梁施工
方案
Lancang River Bridge
railway bridge
arch bridge
bridge erection by vertical rotation method
two-time vertical rotation
bridge construction
scheme
