大跨胶接缝组合梁斜拉桥整体节段横向反拱足尺模型试验

Full-Scale Model Test for Transverse Pre-bending Integrated Segmental Composite Girder of Quanzhou Bay Sea-crossing Bridge

泉州湾跨海大桥主桥组合梁采用整体节段场地总拼、横向反拱及桥面板胶拼等全新施工工艺,国内外均无实施先例。针对施工工艺中存在的技术难题,开展组合梁整体节段横向反拱足尺模型试验。试验预演组合梁制造阶段施工流程,并对钢梁线形以及桥面板应力进行了测试。试验结果表明：所采用的横向反拱工艺以及设备是可行的;对于20m宽幅组合梁来说,钢梁反拱至17-18mm时可为桥面板预存1.5~3MPa压应力;从节段接缝口横向变形来看,梁段在经历场地拼装及横向反拱过程后,将为节段桥位安装累积不大于1.5mm的不利误差。

A lot of new construction techniques have been used in the composite girder of Quanzhou Bay sea- crossing Bridge, such as integral segment in-＇situ assembly, transverse pre-bending, deck splicing by glue. For the technical problems during construction process, the transverse pre-bending full-scale model test for integral segmental composite girder is conducted. Tests pre-perform the construction process during manufacture phase of integrated segmental composite girder, the alignment of steel beams and stress of bridge deck are tested. The results show that the process and equipment used in transverse pre-bending is feasible; for 20m wide composite girder, compressive stress 1.5 -- 3 MPa can be stored in bridge deck when the camber of girder is 17 -18mm; as to the transverse alignment of segment joints, no more than negative error of 1. 5ram will be accumulated to segment installation after site assembling, transverse pre-bending.