The Swing Construction Technology Research Of Xinghe Bridge Of Zhang Hu Railway

Horizontal swing construction is a common scheme used in bridge construction.When pre-stressed concrete continuous beam or rigid frame bridge crosses the existing railway, it is common to adopt the horizontal swing construction scheme for purpose of reducing influence on normal operation of existing railways. For pre-stressed concrete continuous beam swing construction, pounding bottom swing construction scheme is commonly adopted domestically but pounding top swing is seldom used at present. The railway passenger transport line from Zhangjiakou to Hohhot Xinghe Brige under construction crosses Zhangji Railway(48+80+48)m.Xinghe Bridge pier is 28 m high and pounding top swing construction scheme is adopted. This thesis analyzes and studies some critical construction techniques of this bridge from perspectives of its structure and pounding top swing construction features,covering: 0# block construction control technique, cradle and cantilever construction control technique, swing construction control technique, closure segment construction control technique as well as geometric shape and stress monitoring technique.Implementation of these critical techniques on site ensure safe and orderly construction of Xinghe Bridge; the bridge pounding top swing is stable and smooth;geometric shape and stress after closure conform to construction technical specifications. All above prove feasibility and effectiveness of these critical techniques in application. Structural stress and the overall geometric shape of Xinghe Bridge under varied construction conditions are analyzed and calculated; meanwhile,achieve overall learning of the bridge actual stress and geometric shape status in the process of construction by actual monitoring of geometric shape and stress on site so as to guarantee that geometric shape of the continuous main bridge is under precise and reliable control all the time. In this way, smooth bridge swing and high precision closure can be guaranteed; internal force is rational and the box-beam geometric shape of the finished bridge meets the design purpose.