基于漂浮体系的多种桥梁顶升支撑-约束系统力学行为研究

桥梁顶升改造工程是为满足城市快速发展的一个典型举措,该文以哈尔滨东三环某桥梁工程为例,介绍为满足该项目桥梁顶升所设计的支撑-约束系统。具体为支撑系统中的抱柱梁、钢管支撑、顶升盖梁加固和桥台支撑构件,约束系统中的贝雷梁与钢柱组合限位结构(用于桥台限位)、纯钢柱限位结构(用于桥限位)。另外,最后分析部分支撑-约束体系的力学性能,具体为支撑系统中的抱柱梁牛腿施工计算、钢管支撑仿真模拟计算,约束系统中的抱柱梁限位结构仿真模拟计算、顶盖梁限位结构仿真模拟计算。结果表明,顶升支撑结构最大应力为189.7 MPa,顶盖梁工况最大应力为133 MPa,最大变形为11.5 mm;顶盖梁工况最大应力为124 MPa,最大变形为10.6 mm。

Bridge jacking reconstruction project is a typical measure to meet the rapid development of the city.This paper takes a bridge project in the East Third Ring Road of Harbin as an example to introduce the bolt-constraint system designed to meet the bridge jacking project.Specifically for the support system in the column beam,steel pipe support,jacking cover beam reinforcement,abutment support member,the restraint system of Bailey beam and steel column combined limit structure(for abut-ment limit),pure steel column limit structure(for bridge pier limit).In addition,the mechanical properties of part of the bracingrestraint system are analyzed,such as the construction calculation of bracing beam and steel pipe support in the bracing system,the simulation calculation of the limiting structure of the holding column beam and the limiting structure of the top cover beam in the restraint system.The results show that the maximum stress of jacking bracing structure is 189.7 MPa,the maximum stress of top cover beam is 133 MPa and the maximum deformation is 11.5 mm,and the maximum stress of top cover beam is 124 MPa and the maximum deformation is 10.6 mm.