高速铁路站台线并入道岔梁处末跨切边梁架设方法研究

Research on the Method of Erecting the End Span Tangential Beam at the Intersection Beam of the High Speed Railway Platform Line

新建中卫至兰州客运专线兰州新区南站东咽喉双线变四线处,站台左线为3孔单线简支箱梁预制架设,其他站台线和咽喉区道岔梁均为支架现浇,站台左线末跨切边单线箱梁架设时需将架桥机前支腿的一侧立柱支承在道岔梁翼缘板上,由于局部受力,将导致道岔梁翼缘板结构破坏,为特殊工况架梁。该文通过中兰客专兰州新区南站站台左线工程实例,对采用JQXD-550型架桥机在该工况下架设末跨单线箱梁的施工技术进行了全面研究,通过对道岔现浇梁梁面架桥机一号柱支点位置扩大钢板支垫和翼缘板设置临时支撑加固处理,有效地解决了桥梁安全架设难题,为类似桥梁架设施工提供了参考。

The new Zhongwei Lanzhou New Area Passenger Dedicated Line will be built on the fourth line from the double track to the east throat of Lanzhou New Area South Station.The left line of the platform will be prefabricated and erected with 3-hole single track simply supported box girders.The turnout beams of other platform lines and throat areas are cast-in-situ with supports.When erecting the single track box girders with edge cutting at the end of the left line of the platform,one side of the column of the front leg of the bridge erecting machine needs to be supported on the flange plate of the turnout beam.Due to local stress,the flange plate structure of the turnout beam will be damaged,beam erection for special working conditions.Through the example of the left line project of the platform of South Station in Lanzhou New Area of the China Lanzhou Passenger Dedicated Railway,this paper conducts a comprehensive study on the construction technology of erecting the single track box girder of the end span with the JQXD-550 bridge erecting machine under this working condition.By expanding the position of the first column fulcrum of the turnout cast-in-situ beam girder girder erecting machine and setting temporary support and reinforcement for the flange plate,this paper effectively solves the problem of bridge safety erection,and provides a reference for similar bridge erection construction.