【作者】 吴杨；

【导师】 完海鹰；

【作者基本信息】 合肥工业大学 ， 结构工程， 2010， 硕士

【摘要】 随着城乡经济的高速发展,模板高支撑体系在现浇混凝土结构施工中的应用越来越广泛,而扣件式高大模板支架体系是我国目前使用量最大、应用最普遍的一种模板支撑形式。由于对于此类结构的设计计算和实际搭设存在着许多不确定、不安全的因素,导致了扣件式高大模板支架体系倒塌事故频频发生,严重影响了施工安全和建筑物的使用性能。因此,扣件式高大模板支架体系的稳定承载能力是一项迫切需要研究的课题。本文首先总结了国内外对脚手架和模板支撑架方面的研究成果,为后面的研究提供了思路和方法,接着回顾了脚手架在我国的发展过程以及今后的发展动向,介绍了扣件式钢管脚手架的基本组成;然后,列举了近年来发生的重大的脚手架和模板支撑架的安全事故,并分析了这些事故发生的原因和预防措施;最后,介绍了扣件式钢管脚手架的主要计算模型及常用的计算方法。本文以合肥市渡江战役纪念馆船头悬臂结构高支撑体系为例,介绍了悬臂结构的主要施工工况及高支撑体系的设计方案,并选用4800mm长的槽钢和钢管作为立杆,间距600mm,步距1200mm,对钢管和槽钢顶端施加竖向压力,对其在竖向荷载作用下的失稳变形进行检测,并对三扣件搭接和四扣件搭接的钢管施加拉力,对其在荷载作用下扣件抗滑承载力进行检测,观察试验现象,记录构件的应变和挠度变化情况。对所得到的结果进行了分析,得出了一些有益的结论,这些结论对于认识模板支架的工作性能以及指导实际工程有一定的参考价值。更多还原

【Abstract】 With the highly development of urban and rural economy,high form work support system has been more and more extensively applied to the cast-in-place concrete structure,and its consumption is the largest,its application is the widest in all form of formwork-supports at present in our country. But because some uncertain,unsafe factors exist in calculation of structural design and set up the frame in practice,caused the collapse of high-formwork-supports with couplers happened again and again,influenced the safety of construction and the use of building seriously. So,its stability capacity is a question which need urgently to solve.Firstly,the dissertation concluded the study fruit of scaffold and falsework both at home and aboard,which is very useful for the following study and reviewed the development process and the trend of scaffold in our country. In particularly,introduced the structure of the fasten-style tubular steel scaffolding. Then,enumerated the safety accidents of scaffolds in recent years and analyzed the reasons which cause these accidents,concluded the means to avoid the happening of these accidents. At last, introduced the main computation model a method of the falsework.From these analysis results,the author drew conclusions which are very useful to understand the mechanical capacity of the falsework system and guide the engineering practice.更多还原