Key Technology Of Multi-point Bridge Swivel System And Applied Researches

The engineering background of this eaasy is the cross-railway transfer bridge project of Changqing Road in Wuhan.The swivel bridge is located in the downtown area of the city and has multiple railway hub routes.The construction environment is complex and needs to be constructed by the swivel method.However,since one end of the swivel beam is blocked by an unremovable building not far from the central ball joint,the main beam of the swivel bridge can only be rotated in a very asymmetrical form.In response to many technical problems faced,the project adopted a new type of multi-point support bridge swivel system.At the same time,due to various influencing factors and strong technical requirements during construction,construction monitoring is particularly important.Firstly,in this essay,I introduce some technical difficulties of multi-point support swivel bridge and proposes corresponding solutions.One of the difficulties is the extreme asymmetry of the two ends.For this reason,a front branch is added at the long arm end 23.6m away from the central ball joint.Leg auxiliary support,with the short arm end weight to maintain balance at both ends of the beam body,smooth rotation.The second difficulty is that the friction is large and the traction is difficult.Therefore,a set of auxiliary support walking force system is designed to provide power at the auxiliary support and solve the problem of insufficient traction of the bridge.The third difficulty is to use the double-width same pier technology,set the temporary tower and beam to ensure the synchronization of the two swivels.Subsequently,a construction monitoring plan was developed for the characteristics of the swivel bridge,and the contents and methods of the construction monitoring were introduced in detail,in addition to the linear monitoring,stress monitoring,disassembly monitoring,weighing test and rotational monitoring of the conventional swivel bridge construction monitoring.In addition,the monitoring of the stress of the front leg and the stress of the track beam is added.At the same time,the real bridge model of the multi-point support swivel bridge was established by Midas/Civil,and the key construction process of the main girder of the bridge was simulated.The force of the main beam under each working condition of the disassembly stage was analyzed and compared.And security status.In addition,in the essay,I compare the measured data with the theoretical analysis data,analyzes the deflection,stress and internal force of the bridge during the whole construction process to ensure the state safety of the whole process.At the same time,the speed of the rotating body,the angle of rotation of the bridge,and the linear elevation of the main beam during the whole construction process are monitored in real time,so that the whole construction process of the bridge is smooth and safe.