Research On Design And Construction Of Cable Hoisting System For Three-span Susupension Bridge

Since the founding of our country,the transportation construction has made great progress.The bridge construction has entered a new era.Some large-span bridges have begun to be built,and suspension bridges play an important role in long-span bridges by virtue of their own spanning capacity.In the mountainous area,due to the topography,the construction site is limited by the terrain,and the bridge components and large construction equipment are very difficult to transport.Therefore,the choice of suspension bridge stiffening girder hoisting equipment has become the key to suspension bridge construction.At present,the suspension bridge stiffening girder hoisting equipment mainly includes cable crane,deck erection gantry,and bridge cranes.However,since the deck erection gantry can only move horizontally when it is no-load,and vertically hoist at the time of heavy load,and requires the bridge to have certain water transportation conditions,so it is impossible to hoist the stiffening girder of the suspension bridge across the river.The bridge crane has less lifting capacity and low construction efficiency,and is not suitable for lifting of large tonnage stiffening girder.However,the cable hoisting method can adapt to the stiffening girder lifting under various construction environments.This paper takes Guizhou Three-span Dahe Bridge as the background,and studies the design scheme of the two tower five-span cable hoisting system based on the development of the common cable crane,and designs the main components of the scheme and studies key technologies.This paper mainly includes the following aspects:(1)In view of the structural characteristics and construction requirements of the suspension bridge,this paper discusses the differences between the cable crane and other stiffening girder lifting methods in the construction of the suspension bridge,and analyzes the characteristics of cable cranes for several suspension bridges in China.(2)This paper discusses two main basic theories of the main cable calculation,and clarifies the application of two basic theories in practical engineering.(3)This paper briefly introduces the general situation of the Dahe Bridge Project,and analyzes the design requirements of the cable crane for the characteristics of the main span of the suspension bridge and the large weight of the stiffening girder,and clarifies the design scheme of the cable crane.This paper summarizes the technical points and layout of the main components such as bearing cable,hoisting cable,traction cable,cable supporting device,saddle,lifting device,ground anchoring system,automatic control system,spreader and winch.This paper studies the erection technique of the cable hoisting system of the Dahe Super Bridge and summarizes the transportation and installation methods of the main girder.(4)According to the actual situation of the suspension bridge,the bearing cables,hoisting cables and traction cables of the mid-span and two-side cable hoisting systems of the Dahe Bridge are designed.Finally,the cable members meet the safety requirements.(5)The design of the side-span tower of the Dahe Bridge is carried out,and the finite element software is used to model and analyze the tower under different working conditions,and the side-span tower is checked to meet the safety requirements.According to the actual situation of the project,the embedded parts and connecting plates of the anchoring system are designed and verified to meet the safety requirements.