大跨度T构0#块支架设计与关键施工技术

Design and Key Construction Technology of Long-span T-structure 0#-block Support

摘要:

连续梁拥有目前最广、种类最丰富的桥梁类型，其相关的施工方式也是拥有许多种类。选择相应的组合支撑结构可以适用于各类现浇桥梁类型，同时也适用于变高度连续梁的施工。当对于上跨既有建筑的变高度连续梁，下部建筑有限高要求时^［1］，应该特别注意限高要求和合理的选择支架的材料。为契合某100 mT构0#块的技术要求，创新性地提出采用由桁架、贝雷梁以及托架组合而成的混合支架体系来开展施工工作。借助有限元分析软件 MIDAS Civil，构建了桥梁临时支架的计算模型，以此对桥梁整体的受力状况予以模拟，同时针对支架各部分材料的受力情形，以及材料的强度、刚度与稳定性等各项指标展开了深入分析，进而得出了关于现浇支架可行性的相应结论。

Abstract:

Continuous beams currently have the widest range and the most diverse types of bridges, and there are many types of related construction methods. The selection of corresponding combined support structure can be applied to various types of cast-in-place bridges, and is also suitable for the construction of variable-height continuous beams. When the variable-height continuous beam spans the existing buildings and there is a limited height requirement of the lower buildings, the special attention should be paid to height limit requirements and reasonable selection of bracket materials. In order to meet the technical requirements of a 100 mT-structure 0# block, it is innovatively proposed to use a combined bracket system composed of trusses, Bailey beams and brackets to carry out the construction. With the help of finite element analysis software MIDAS Civil, the calculation model of the temporary bracket of the bridge is built to simulate the overall stress condition of the bridge, and at the same time, the stress situation of each part of the bracket material, the strength, stiffness and stability of the material and other indicators are further analyzed, and then the corresponding conclusion on the feasibility of the cast-in-place bracket is drawn.