Abstract:The Yihe bridge on Beijing Road adopts the construction scheme of retaining and using the old bridge after jacking up 2.57M and building a new widening bridge on both sides. The small box girder with a standard span of 30m and the prestressed concrete continuous beam with two spans of 60m + 60.69m belong to the widening between different spans and different structures. During the widening, appropriate measures need to be taken to deal with the displacement difference caused by different spans. When UHPC seamless widening is adopted, it is necessary to reasonably design the joint in order to realize the overall stress of the widening bridge and the old bridge. After detailed analysis and calculation, 10cm thick UHPC concrete is selected for the pavement at the longitudinal joint to form a rigid connection, embedded portal reinforcement is arranged in the widening bridge, and portal reinforcement is planted in the small box girder of the old bridge to form an integral structure; 5mm stainless steel plate and 5mm rubber plate are arranged on the longitudinal joint. The paving reinforcement is bound with the reinforcement in UHPC to form an integral pavement layer. The rubber plate is set with different thickness according to different stress characteristics to adapt to the deformation of unequal spans of the bridge. The full-scale loading test of the spliced structure is carried out, and the test results are basically consistent with the finite element analysis results.
