High-performance Construction Technology of Segmental Precast Full-glue-assembly Concrete Continuous Grider of High Speed Railway
Based on the construction technology of prefabricated assembly of steel bridge segments,all concrete segments are uniquely numbered,and prefabricated and tangent assembly are matched with millimeter-level accuracy.The temporary prestress between segments is designed as external prestress.The calculation model of the structural system including the segmental beam,the temporary prestress of the segment,the main grider of the bridge erecting machine and the suspender is constructed.The deformation of the main grider and the suspender of the bridge erecting machine caused by the moving load of the segment and the impact effect of the stress conversion of the hook to the stress of the suspender are taken into account.The whole section stress analysis of each glue joint in the whole process of assembly construction is carried out,and the tensile stress of the glue joint in the assembly process is controlled by fine calculation.The tension of the suspender of the bridge erecting machine is controlled,and the four suspenders of the segment are tensioned synchronously to prevent the dislocation between the segments.The segments are assembled section by section,and the subsequent segments produce compression deformation loss to the temporary prestress of the assembled segments.The main reasons for the cracking of the adhesive joints are the loss of control of the temporary prestress and the tension of the adhesive joints in the subsequent segment assembly.The durability design of adhesive joints is mainly reflected in multi-channel waterproof design and refined construction.Water is injected at the position of adhesive joints to detect the sealing performance of adhesive joints.A construction monitoring system combining manual and automatic monitoring is adopted to achieve high-precision alignment and prevent cracks in adhesive joints.The frame system of high performance construction of segmental precast fully cemented continuous beam is established.
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