60 m+60 m双跨连续梁上跨铁路非对称转体设计研究

Research on Asymmetric Rotation Design of (60+60)-m Double-span Continuous Beam over Railway

摘要:

西安国际港务区欧亚大道涉铁段高架桥为上跨陇海铁路货运北环线而设，设计为60 m+60 m双幅预应力混凝土变截面连续箱梁桥。为了给规划地铁3号线及地面道路预留通道，避免对地铁10号线高架桥的影响，在施工过程中，采用在门式墩顶部同步水平非对称转体的施工方法。在满足桥梁功能的前提下，极大限度地减少了桥梁施工对既有铁路运营的干扰。采用双跨连续梁上跨铁路，非对称转体施工，结构新颖、受力复杂、转体吨位大、非对称跨度长、且在门式墩顶部实施转体，在西北地区尚属首例。

Abstract:

The elevated bridge of the railway section of Ouya Avenue in Xi'an International Port District is set up to span the North Ring Line of Lanzhou-Lianyungang Railway for freight transportation, and is a (60+60)-m double-amplitude prestressed concrete variable cross-section continuous box beam bridge. In order to reserve the channels for the planned Metro Line 3 and ground roads, and avoid affecting the elevated bridge of Metro Line 10, a construction method of synchronous horizontal asymmetric rotation at the top of the portal pier is adopted during the construction process. On the premise of meeting the functions of the bridge, the interference of bridge construction on the operation of existing railways is greatly reduced. The double-span continuous beams to span the railway is adopted with the asymmetric rotation construction method. The structure is novel, the stress is complex, the rotation tonnage is large, the asymmetric span is long, and the rotation is carried out at the top of the portal pier, which is the first of its kind in northwest China.