复合式移动模架尾部吊挂系统设计探讨

尾部吊挂在已浇筑的混凝土梁面上走行的复合式移动模架因具备支腿自移功能,在国内外桥梁施工中得到大量应用,但此类移动模架的事故率也是相对较高的,且大多缘于吊挂系统的设计或加工缺陷。通过分析吊挂系统在走行过程中受到的多维度不断变化的弯、剪、扭、拉组合作用,结合实际使用中的经验教训,总结其计算、设计、制造及现场处理等方面需要注意的若干事项,并对照这些结论和建议,讨论几种常见的复合式移动模架吊挂系统设计方案的优缺点,以及在设计吊挂系统时动态地、相互关联地按照构件在使用中的真实情况研究其极限状态与破坏规律的重要性。

Approach to the Design of Compound MSS Tail Hanging System

Owning to the self-moving brackets,the compound MSS with tail hanging running on the surface of cast in situ concrete girder has been widely used in bridge construction at home and abroad.But accidents of the MSS occur frequently, resulted largely from the hanging system design or manufacturing defects. This paper analyzes the hanging system being acted upon by the combination of the multi-dimensional changing of bending,shearing,torsion and pulling in the process of walking. With reference to the lessons learned in the actual operation,a number of issues on its calculation,design,manufacturing,and on-site handling are summarized,the merits and demerits of several common compound MSS designs are discussed on the basis of these conclusions and recommendations,and the importance is addressed of the limit status and failure laws relating to each other according to the element true conditions in use in the designing of the hanging system.