Key Technologies and Innovations for the Construction of Steel Tube Arch Bridge Connecting with Tunnel in Deep Canyon
Based on the Dongxi River Grand Bridge on the Wuxi-Zhenping Expressway,a key technology for the construction of steel tube arch bridges in deep canyons with tunnel connections at both ends and difficult construction of steel tube concrete arch bridges has been studied,and a number of patents have been obtained.Four sets of cable crane systems,one set of 1 t temporary working cables,one set of 30 t lifting cables,and two sets of 105 t cable cranes have been designed.The 105 t cable crane saddle is a'transverse+fixed'structure,which solves the problem of no cable tower on one side in deep canyon areas.For the first time,a long longitudinal slope,large drop,and large volume concrete pumping down construction technology has been proposed,which creatively realizes concrete pumping down at a height of 115 m.A precise control steel tube concrete arch rib horizontal assembly device,a flange plate for arch rib chord tube joints,a connecting mechanism,and a flange connection method have been developed to improve installation efficiency.A deep canyon using a mixing storage hopper+two-stage relay pumping method to solve the problem of long-distance and large-height concrete pressure injection has been proposed.Field practice has shown that the use of these technologies ensures the construction quality and safety of the bridge,and the relevant experience is worth learning.
deep canyonbridge-tunnel connectionsteel pipe arch bridgecable crane
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