西宝客专常兴渭河特大桥节段拼装施工及控制技术

Construction and Control Techniques for Segment Precasting and Full-span Erection for Wei River Bridge at Changxing on Xi′an-Baoji Passenger Dedicated Line

西安至宝鸡客运专线常兴渭河特大桥采用2 000 t下行式架桥机节段拼装48 m简支箱梁施工技术。文中介绍了箱梁节段预制、架桥机整跨拼装等施工工序,重点探讨了梁段精确定位、预应力张拉及梁体脱架、现场监测等关键问题,可为类似工程提供参考。

The construction scheme of segment precasting and full span girder erection by a 2 000 t overhead launching gantry was adopted for the 48 m span simply-supported concrete box girders of the Wei River Bridge at Changxing on Xi′an-Baoji Passenger Dedicated Line.Main construction procedure such as segment precasting and full-span erection is introduced in this paper,also the key techniques in aspect of locating accurately of precast segments,prestressing of strands,removing from launching gantry,monitoring are discussed,which can provide references for similar projects.