Resrarch On Construction Control Of Long Span Restressed Concrete Continuous Girder Bridges

With the rapid development of traffic construction in our country, as well ascantilever construction technology and construction equipment is perfect, and theprogress of construction technology of long-span prestressed concrete continuous girderbridge has become increasingly mature. Continuous girder Bridges due to theadvantages of large span and driving a smooth, has become a long-span prestressedconcrete Bridges is preferable. Cantilever pouring construction due to the bridge trafficinterference can be avoided without heavy scaffolding, etc, and it used in shenyangnorth bridge span railway Bridges in the hanging basket cantilever site cast constructionmethodBased on the shenyang subei construction technique of cantilever casting ofcontinuous beam bridge as the background, through the finite element analysis softwarereal-time simulation according to actual construction state of the bridge. With doctorbridge V3.0simulation analysis of each section in the condition of each bridge pierunder the stress and strain and elevation changes. Using finite element analysis softwareMidas Civil2010to check calculation. In the process of finite element simulationanalysis accurate simulation of the hanging basket construction steps, the simulatedsystem transformation, the process of calculation of the temporary anchorage stabilityand the strength of the concrete filled steel tubular column and steel pipe. By setting theconcrete stress and strain sensors, measuring stress value in the process of constructionmonitoring. Layout elevation control point, real-time monitoring of bridge throughelectronic level elevation. According to the actual monitoring results, the error analysiswith gray system theory, and the elevation adjustment of hanging basket, guide theshenyang subei linear control of continuous beam bridgeDue to the change of the actual construction conditions, computational model ofeach parameter of the deviation, creep and shrinkage of concrete, the volume ofproduction error, temporary load, the control, construction hanging basket positioningand deformation, prestressed tensioning, measurement error and environmental factorssuch as interference will structure the actual status value deviates from the design value.In the process of construction monitoring influential parameters must be strictlycontrolled. Deviation analysis, reason and judgment in a timely manner after processing,to make the final linear and stress reaches the ideal theoretical design value Through to the long-span prestressed concrete continuous girder bridgeconstruction monitoring summary, through effective control means the north bridge,stress and strain and the change of elevation of the theoretical value measured valuescoincide well, ensure the quality of the construction of the bridge...