乐夹大道青衣江大桥大件荷载连续梁施工关键技术

Key Technology of Continuous Girder Bridge with Large Load on Lejia Avenue Qingyi River Bridge

青衣江大桥是峨眉至夹江联网畅通乐夹大道的控制性工程,且有大件荷载通行的要求。该桥梁采用整体性好、刚度大的预应力混凝土连续梁设计以满足大件荷载要求;采用整联现浇,两端张拉预应力的施工方案,可加快多联多跨连续梁施工进度,不受施工顺序的限制;采用拉索抗震盆式支座的解决地震作用下各墩受力不均衡的问题;分别采用碗扣式满堂支架和钢管贝雷梁支架结构的施工方式,减少河道内水位的影响。

The Qingyi River Bridge is a controlled project for the unobstructed Lejia Avenue from Emei to Jiajiang,and there are requirements for passage of large loads.The bridge adopts a pre-stressed concrete continuous beam design with good integrity and high rigidity to meet the large load requirements;it adopts a construction plan of integrated cast-in-place and tensioned prestress at both ends,which can speed up the construction schedule of multi-span continuous beams is not restricted by the construction sequence;the use of cable seismic-resistant basin supports solves the problem of unbalanced forces on the piers under the action of earthquake;the construction method of of bowl-buckle full-floor bracket and steel pipe Bailey beam support structure reduces impact of the water level in the river.