Research on Critical Technology of Cable Hoisting Construction of Large-Span Bridge

Bridges are important nodes in the transportation network, and the rationality of design and the safety of construction should be paid more attention to. Erecting the main cable strand and hoisting the main girder are important links in the construction of suspension bridges, which will affect the quality and efficiency of the whole construction. To research the critical technology of cable hoisting construction, a truss-steel suspension bridge is investigated. The main cable of the research object is carried out by the Prefabricated Parrel Wire Strand (PPWS) method. And, the erected catwalk system then undertakes the main girder hoisting process. The lineshape and cable length are calculated based on the parabolic theory, and then the tractive force required for the main cable erection is also obtained. The force analysis of carrier cable, hoisting cable, and haulage cable of the catwalk cable hoisting system has been conducted, which ensures the safety of the system. The results show the tractive force of the main cable construction is mainly affected by the reverse tension and gravity. The mid-span sag between the portals will affect the tractive force of winches. Reasonable design can ensure the bearing capacity of the cable when hoisting the main beam. In the discussed study case, the successful application of the cable hoisting system can prove a method and reference to similar construction.