Cantilever Construction Technology of the Combined Main Girder with Long Segment for Cable-stayed Bridge
The main navigation channel bridge of Lupar Bridge is a double-tower and double-cable plane concrete cable-stayed bridge.The main girder is a π type concrete combined girder.The standard section length is 10.2m,the width is 17.3m,and the center height is 2.5m.The cable anchor block and crossbeam of the main girder are prefabricated components,the side girder and deck are cast-in-site concrete members,and the main components are connected together by transverse prestress.This paper takes the cantilever construction of the main girder of the bridge as the engineering background,and compares two construction schemes of the main girder from three aspects of quality control,construction plan,and construction cost.Finally,the suitable cable hanging basket scheme for the construction of the main girder of the bridge is determined,which can effectively reduce the additional stress caused by the self weight of the temporary structure on the poured section concrete and reduce the engineering cost;At the same time,a special design is carried out for the construction of No.2 to No.15 main girder sections using a new type of truss type cable hanging basket,which solves the problems of long length,heavy weight,high installation accuracy requirements for prefabricated components,and long construction period of the main girder sections.
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