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ON-SITE MEASUREMENT AND ANALYSIS OF SUPER HIGH OR LARGE-SPAN FORMWORK SUPPORT WITH FASTENER STEEL TUBE
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摘要: 对某工程超高大跨模板支撑体系的主梁及板底立杆内力进行了现场实测。结果分析表明：混凝土浇注到荷载分担区域立杆才会出现较大内力响应；采用泵送方式浇注混凝土对模板支撑体系既有水平冲击力，也有竖向冲击力；立杆的轴力不是沿高度均匀分布的，但按现行规范采用区域荷载计算法计算各立杆内力仍是安全的；水平杆和剪刀撑有调节各立杆内力的作用，整个支撑体系是整体受力的结构；泵送工艺及浇注路径都可能诱发水平荷载，使立杆上下两端轴力差别较大，对高大模板支撑体系产生不利影响。根据分析结果，对高大模板扣件式钢管支撑体系的设计计算和工程控制提出改进意见。Abstract: The axial forces of vertical struts of the main beam and the plate bottom for a super high or large-span formwork support was measured on site during the period of casting concrete.The results showed that axial forces of vertical struts increased significantly after pouring the concrete above them, pumping had not only horizontal impact force but also vertical impact force, axial forces of vertical struts were uneven along the height, yet it was still safe to calculate the axial forces of the vertical struts by the regional load calculation method in the current code.There was an interaction between each tube of the formwork support, pumping and concrete placing route would induce horizontal force that would produce unfavorable effect on the stability of formwork support.According to the measured results, the present design and calculation method should be modified, and several effective suggestions on the construction of super high or large-span formwork support with fastener steel tube were provided.
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陈园卿,章雪峰,胡威诣.水平荷载作用下混凝土结构扣件式钢管模板高支撑体系受力分析[J].建筑技术,2007,38(8):612－614. [2] 朱世哲,卫严,蔡建深.某梁板高支模架倒塌事故的分析及处置[J].工业建筑,2009,39(9):121－123. [3] 张学智,章雪峰,应义淼,等.混凝土结构扣件式钢管模板高支撑体系现场检测和分析[J].工业建筑,2011,41(1):15－18. [4] 庄金平,蔡雪峰,林增忠,等.超高大跨模板支撑体系现场实测及承载力公式修正方法探讨[J].工业建筑,2011,41(9):94－99. [5] 欧阳杰.某办公楼高支模的计算及应用[J].工业建筑,2008,38(增刊):981－985. [6] JGJ 1302011建筑施工扣件式钢管脚手架安全技术规范[S]. [7] 章雪峰.混凝土结构扣件式钢管模板支撑体系整体受力分析[D].杭州:浙江工业大学,2005. [8] GB 506662011混凝土结构工程施工规范[S]. [9] 毛红卫,章雪峰,胡威诣,等.混凝土浇筑路径的选择与模板支撑体系受力分析[J].浙江建筑,2006,23(10):17－19. [10] 杨俊杰,章雪峰,徐卫敏.混凝土浇筑路径与模板支撑体系内力响应[J].施工技术,2006,35(7):47－49. -
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