有限空间双层钢箱梁吊装工艺研究

Study on Hoisting Technology of Double Deck Steel Box Girder in Finite Space

针对双层钢箱梁施工空间受限问题,本文研究了双层临时支架设计及吊装施工工艺。以莞番高速石龙坑大桥为例,将该桥按右侧下层钢箱梁、右侧上层钢箱梁、左侧下层钢箱梁、左侧上层钢箱梁的顺序进行临时支架架设、吊装施工。基于BIM建筑工程精细化建模模拟、优化、跟踪支架架设、箱梁吊装施工全过程,采用MIDAS Civil模型对临时支架、钢箱梁的强度、稳定性、地基承载力进行分析验算。结果表明,本项目设计的临时支架符合规范要求,可用于双层钢箱梁施工。本文提出的有限空间双层钢箱梁吊装工艺已成功应用于莞番高速石龙坑大桥第三、四联,说明该方法是合理可行的,可推广应用于同类桥梁的施工。

In this paper, in view of the finite construction space of double-layer steel box girder, the design and hoisting construction technology of double-layer temporary support are studied. Taking the Shilongkeng Bridge of Guanfan Expressway as an example, the bridge is erected and hoisted with temporary supports in the sequence of lower steel box girder on the right, upper steel box girder on the right, lower steel box girder on the left and upper steel box girder on the left. Based on BIM refined modeling of construction engineering simulation, the whole process of construction and hoisting are optimized and tracked. MIDAS Civil model is used to analyze and check the strength, stability and foundation bearing capacity of temporary support and steel box girder. The results show that the temporary support designed in this project meets the specification requirements and can be used for the construction of double-layer steel box girder. The hoisting technology of finite space double-layer steel box girder proposed in this paper has been successfully applied to the third and the fourth links of the Shilongkeng Bridge of Guanfan Expressway, which shows that this method is reasonable and feasible and can be popularized and applied to the construction of similar bridges.