The Key Technology Research Of Hoisting Steel Box Girder Of Triple-tower Suspension Bridge Title

Triple-tower suspension bridge is a new type of bridge structure. Its strong spanningability is suitable for great river, and across the vast gulf project. However, there aresome issues worthy of further study when the structure is put into engineering practice,especially in the construction. With a triple-tower suspension bridge as the engineeringbackground,paper established two detailed construction process of disassembly analysisby the finite element analysis software which is based on the finite displacementtheory.One hoisting scheme is from mid-span to the towers and the other is from twotowers to mid-span.Paper recommended hoisting scheme by comparing and analyzingthe change rule of main cable displacement and the angle of main cable on the side oftower, distribution and change rule of vertical distance between main cable and edge ofcable tower, distribution and change rule of axial force of hangers, distribution andchange rule of slits between lower limb of girders. Separate cable tower model isestablished to analysis the rule of cable saddle pushing sliding rule. According to therecommended hoisting scheme, a stiffening girder construction of cable saddle pushingstages and pushing is given. Paper studied the displacement of the top of middle towerand the safety coefficient of the main cable tower top slip resistant when the main-spanhoisting construction is asymmetric, the construction control index is given.Results isof certain reference significance for triple-tower suspension bridge steel box girderconstruction.