钢箱连续梁结构线形调整改造施工技术

根据厦门市工程改造的总体部署,仙岳路主线既有多座跨线桥不符合全线高架的线形标高规划,需进行改造.以莲岳路口跨线立交——(2×35+45+2×35) m等高度连续钢箱梁桥为例,通过分析对比桥梁改造前、后的线形,设计出最优的调整改造方案,并计算确定梁体支点转换的合理顺序.首先在该桥6个桥墩及中间3跨跨中切除9个短节段,将全...

Construction Techniques of Geometry Adjustment and Modification for Steel Box Continuous Beam Structure

According to the overall deployment of project renovation,more than an existing overpass bridge on the trunk of Xianyue Road do not meet the elevation programming of geometry made for the viaducts on the whole line,necessitating renovation.With the interchange over the intersection of Lianyue Road,a(2×35+45+2×35) m equal-depth continuous steel box beam bridge,as background and on the basis of the comparison and analysis of the alignment difference of the bridge before and after the renovation,the optimum adjustment and retrofit scheme is worked out and the rational sequence of support conversion is determined by calculation.That is,firstly,to remove 9 short segments from 6 piers and the mid spans of the central 3 spans of the bridge and to divide the whole superstructure into 8 beam segments;then,to adopt synchronous jack-up technique to erect the segments divided into place without the block of traffic under the bridge;finally,to lower the main beam that has been welded into a whole to the heightened piers.The geometry adjustment and renovation of the bridges are smoothly achieved.