Study On Geometry Control Technology And Key Problems Of Continuous Rigid Frame Bridge With Super High Piers

With the rapid development of the cause of the bridge,bridge constructiontechnology has also been rising.Continuous rigid frame has many advantages,such as itsgood structural stability,cross-ability,expressed construction progress,economic cost,comfortable traveling and so on.This bridge type has strongly competitive when spanbetween one hundred and three hundred meters.In recent years our country have builtmany high piers of continuous rigid frame,but in the long-term effects of main girderunder linear and bridge pier impact are more adverse.Based on the Hezhang bridge, Tianqiao bridge, Hejiaba bridge and Wulipo bridge,the four bridges are high piers across several different combination of long spancontinuous rigid frame bridges and the main job to do is as the following.①A lot of finite element models are set up to analyse in different days theinfluence of concrete shrinkage and creep,the loss of prestresses and temperaturechanges on the displacement of high pier.And then we got the relation between thedisplacement of high pier and their influence factors.②Analyzed the stability of high piers continuous rigid frame,the results indicatethat construction process are the main influences for the stability.③Discussed how to close up the multi-span continuous rigid frame bridge, putforward the method of calculating the pushing volume and introduced the method ofcalculating the jacking force.④According to the influence of external prestress on the bridge for long-term, wediscussed the key to the construction of details of the external prestressing. Discussedthe regulation time of the across deflection of continuous rigid frame bridges.