Research On Construction Technology Of Deep Pile, High Block And Long Span Prestressed Concrete Continuous Rigid Frame Bridges

Takes Laozhuang River bridge as the example to study bridge construction technology of long span continuous prestressed rigid frame bridges.The major bridge of Laozhuang River locates at Site No. K196+750 on the sixth object segment of the superhighway from Huangling to Yan'an. This partition of the superhighway in Shanxi Province is a part of the great one from Bao(Tou)to Bei( Hai) in the western region of China. The length of the main bridge is about 870 meters long, the specification of which is 95+4×170+95m and six strides prestressing force concrete rigid framework. The Huangyan superhighway goes through the hinterland of the Huangtu altiplano. There is a complicated landform along the way. Landslides, collapses, collapse loess and weak foundations are everywhere, which make the construction extremely hard. The major bridge of Laozhuang River has the longest span of the ones on the superhighway, which is about 170 meters long, and its construction is the control engineering of the big project. The deepest pile is up to 102 meters. It is wholly manual work, which turns out to be the first in China. The bridge locates at the joint of the circular curve, sluggish, the curved shape and straight lines. The section cross slope of the girder is continuously changing. The biggest block goes up to 105 meters high, which enlarges the difficulty in the designing and construction of cantilever.This article studies and analyzises the construction technology of the bridge in consideration of the complexity of the deep pile, high block and long-span prestressing force concrete continuous rigid frame girder. It gives some new viewpoints and practical experience to the design and construction of similar bridges in the future.