The Feasibility Analysis of the Incremental Launching Construction of Long-span Continuous Steel Truss Bridge without Supporting Piers

With the advantage of no-effect to shipping,shorter construction time and lower cost,the incremental launching construction method without supporting piers is widely used in the construction of steel and prestressed concrete bridges. At home and aboard,the cases of incremental launching construction of long-span bridges whose cantilever length exceeds 160 m are rare,and the feasibility research on incremental launching construction method in long-span bridges is insufficient. With the example of Dongying Yellow River Bridge,the feasibility of the incremental launching construction method without supporting piers was analysed by using finite element method. The results indicate that,the strength of bridge can't meet the constructional requirements when the length of launching nose is 80 m,and the strength and stability of bridge will both meet the requirements when the length of launching nose is 100 m or 120 m. So the method of incremental launching construction is feasible.