浅谈跨线桥的悬浇与转体组合施工关键技术

Discussion on the Key Technology of Combined Construction of Cast-in-Place Cantilever and Rotating Construction of Overline Bridges

在跨越既有线的桥梁建设中,悬浇及转体施工工艺已得到了广泛应用。由于受限于施工工况,对比于支架法与转体施工,悬浇与转体组合的施工工艺可以将上部结构化整为零,分节段控制纠偏,转体施工前后,分阶段对转体结构的线形型进行调整,更有利于成桥线型的整体控制。论文主要介绍了悬浇与转体施工中挂篮体系设计、合龙段施工、转体系统设计、成桥线型控制等关键技术,并对影响悬浇与转体施工质量和安全的关键控制点进行探究。

In the construction of overline bridges, cast-in-place cantilever and rotating construction technology have been widely applied.Because of the constraints of construction conditions, compared with the bracket method and the rotary construction, the construction technology of the combination of cantilever casting and rotary body can split the superstructure, control and rectify the deviation in sections, and adjust the linear shape of the rotary structure in stages before and after the rotary construction, which is more conducive to the overall control of the bridge line. This paper mainly introduces the key technologies of hanging basket system design, closing section construction, rotary body system design and bridge alignment control in cantilever pouring and rotating construction, and probes into the key control points which affect the quality and safety of cast-in-place cantilever and rotating construction.