Construction Research On Cable Hoisting System Of Beibei Chaoyang Reconstruction Bridge

Cable hoisting system is composed of the main cable, lifting trolley,hoistcables, draglines, winches, tower, the wind cable wire and ground anchors andother components. It is a temporary construction equipment which can transportlarge span and vertical lifting heavy objects. Cable hoisting system has a greatadvantage in terms of vertical lifting and horizontal transportation. Its liftingcapacity can reach hundreds tons and vertical lifting distance can reach hundredsmeters. The device can be designed, installed in-place. Owing to its high-efficiency and small terrain restrict，the cable hoisting construction system is usedin the construction of long-span arch bridge widely.In this thesis, as the background of Beibei Chaoyang bridge cable hangingsystem I mainly discussed the rope static analysis and its application in actualengineering. Combination of static analysis and the relative error between maincable approximation with the exact method, I demonstrates the main cable sagproject design selects the main cable design Span Ratio in1/15to1/20by anexample. Thus neither the structure is overloaded since vertical cross-ratio is too small, nor will increase the difficulty of the lifting trolley course since sagis too large, impact the construction. Also in the design vertical cross-ratiorange, the approximation can replace the exact method to calculate the maincable, fast yet accurate. I also discussed the calculation error of main cablesusing the single and double hanging point, and summarizes the simpl-ified sin-gle hanging point formula instead of the twin-lift formula. And meanwhile Iverified the cable hanging system with a single lifting point is feasible.Using the finite element analysis software Midas/civil I modeled and analysedthe cable hanging ropes and pylon system, and the results showed that the cablehanging system reasonable force, safe and reliable.