钢箱梁桥牵引滑梁设计与施工关键技术

The Key Technology Research on Design and Construction for Traction Sliding Beam of Steel Girder Bridge

目的提出沈阳新南站高架桥在既有地下结构上牵引滑梁设计与施工关键技术方案,以推广此类新施工工艺在复杂地理环境中的应用.方法通过实地考察与理论计算,提出牵引滑梁设计与施工关键技术方案.即支架采用四腿格构式支架形式,横向采用一排贝雷桁架滑道,纵向采用4排贝雷桁架滑道,以供钢箱梁段横、纵向滑移至设计位置焊接拼装.结果支架结构在加载过程中,滑道竖向最大变形为9.6 mm,结构变形满足要求;结构应力均小于所使用钢材的容许应力,应力满足要求;屈曲分析的失稳特征值均大于4.0,稳定性满足要求.结论该施工工艺为施工提出安全保障,提高了经济效益,并为类似工程提供施工参考.

A new traction sliding beam design scheme and the key technology of construction on the existing underground structure of Shenyang South Railway Station viaduct was proposed. Based on field trips and theoretical calculations, a four leg lattice form of support structure was used, in which a transverse slideway with one row of Bailey truss and a longitudinal slideway with 4 rows of Bailey truss were built to weld and assemble the steel box girder segment for transverse or longitudinal slipping to the designed position. It is found that during loading process of the support structure,the maximum vertical deformation of slideway is 9.6mm and meets the requirement. Structure stresses are less then the allowable stresses for all of the used steel. Buckling characteristic values are more than 4. 0, which satisfy the stability requirements. Conclusion is that the proposed design scheme and construction technology can make safety guarantee for construction, im- prove economic efficiency and provide some references for similar engineering construction.