Key Construction Technique of Main Bridge of Fuchunjiang River Bridge of Huzhou-Hangzhou High-Speed Railway
The main bridge of Fuchunjiang River Bridge of Huzhou-Hangzhou High-speed Railway is an extradosed bridge carrying four ballastless tracks.The bridge is arranged in five spans of 30,46,300,97 and 62.395 m,where the superstructure in the 62.395 m-long span on the Tonglu side consists of steel trough girders and concrete slabs,and the superstructure in the remaining spans is composed of prestressed concrete box girders.The construction of the pylons and the superstructure was carried out in parallel to accelerate the construction.During the construction of the foundations of piers No.2 and No.3,the trestles and boring platforms were sequentially installed after the steel cofferdams were in sound condition.A boring technique was tailored for the pier No.2 to ensure the boring quality and efficiency,including the specific steps of underwater pre-split blasting leveling,constructing steel cofferdam ahead of boring platform,and the borehole was made using impact driver for first-phase boring and the rotary drill for borehole formation.The main girders were cast on the scaffolds formed of steel pipes,bailey trusses and a ringlock scaffolding system,and erected on site by the combined utilization of sliding on scaffolds,in-place assembly,and cantilever assembly conducted by barge-mounted cranes,as a result,the erection schedule was shortened.The alignment of the ballastless tracks were accurately controlled by a series of measures,including building a CP 111 control network,thermal sensitivity analysis of main girders,main girder stiffness modification,cable tuning,thickness adjustment for base plates and the adjustment of the thickness of the self-compacting concrete.
high-speed railwaycable-stayed bridgeballastless tracksloping bedrock without overburdensynchronized pylon and girder constructionalignment controlconstruction technique
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