公轨共建高架桥双层预制梁架设施工技术

机场快速路南延（鄞州大道-岳林东路）工程V标段全线均为一体化高架桥，有478片预制小箱梁和82片预制U型梁，上层为机场快速路，下层为宁奉城际轨道交通线路。另有一对平行匝道编号为11#、12#。主线分别考虑梁厂存梁饱和和未饱和情况利用架桥机按既定顺序进行架设。高压线下的架设考虑了现场高度的限制，选用了300t履带吊+500t汽车吊双机抬吊进行安装。匝道的架设1台220吨加一台300吨汽车吊组合方式。最后，对架设方案进行了验算，验算结果良好满足要求。

Construction Technology of Double-deck Prefabricated Girder Erection for Highway-Rail Co-constructed Elevated Bridge

The construction section V of the Airport Expressway South Extension Section (Ring Expressway - East Yuelin Road) Project is a highway-rail co-constructed double-deck elevated bridge. Its lower deck is the prefabricated U-shaped girder and its upper deck is the prefabricated small box beam. The construction technology of using a bridge girder erection machine to realize the synchronous erection of double-deck prefabricated girders is specially introduced. Two different hoisting schemes are developed to effectively solve the difficulties of limited girder pedestal in girder manufactory. The detailed construction analysis and safety checking calculation are carried out for the hoisting of double-deck prefabricated girders under the high-voltage power lines. The problems of hoisting under high-voltage power line with the great safety risk are solved. This construction technology is scientific and effective, which can guarantee the engineering quality and field safety, and have the important guiding significance for the construction of the similar projects.