现浇混凝土模板侧压力理论及公式研究

发布时间：2018-03-26 18:29

本文选题：现浇混凝土　切入点：模板侧压力　出处：《沈阳建筑大学》2014年硕士论文

【摘要】：现浇混凝土模板工程作为建筑工程的一项重要工序,其直接影响到施工质量和模板支撑的可靠性。随着现代施工工艺的改变、添加剂种类的增多,目前混凝土的性能指标已经大为改变。影响混凝土对模板侧压力的主要因素为混凝土的浇筑速度、浇筑高度、塌落度等,特别是添加剂的加入大大影响了混凝土的塌落度。另外,目前的混凝土振捣方式完全采用机械式,强度大、功率高。这些混凝土性能指标的改善及施工技术的提高都影响了现浇混凝土对模板的压力。《建筑施工模板安全技术规范》(JGJ 162-2008)给出了两个公式,一个是系数影响公式,一个是液体压强公式。模板工程中因模板的支撑力不够而引起的建筑事故时常发生,带来了极大的经济损失以及威胁到人的生命安全。随着混凝土结构应用的更加普遍,模板工程在施工的应用和研究越发重要,模板侧压力的研究成为模板工程的一项重要的工作。模板侧压力的研究不仅为模板施工提供安全的数据,而且为模板支撑提供了可靠的支撑措施。本文以现场试验为依据,在现场试验中,采用土压力盒分布在不同的高度以及分布在同一高度不同的位置采集到的数据为依据,研究《建筑施工模板安全技术规范》(JGJ162-2008)给出的两个公式的计算值与现浇混凝土实际受力值进行比较。根据试验值与计算值对比发现,实际的现浇模板压力值最大值和规范给出的液体压强公式接近,在施工过程中采用液体压强公式可为模板工程施工提供可靠的支撑措施。在实际的施工过程中,《建筑施工模板安全技术规范》(JGJ 162-2008)建议采用两个公式计算值的较小值进行实际的模板施工。本文的研究成果将为实际施工提供可靠的计算依据以及为现行模板规范修订提供依据,为施工方案确定提供参考。
[Abstract]:The cast-in-place concrete formwork, as an important process in the construction engineering, directly affects the construction quality and the reliability of the formwork support. With the change of the modern construction technology, the kinds of additives increase. At present, the performance index of concrete has been greatly changed. The main factors that affect the lateral pressure of concrete to the formwork are pouring speed, pouring height, collapse degree, etc. In particular, the addition of additives has greatly affected the collapse degree of concrete. The improvement of these concrete performance indexes and the improvement of construction technology all affect the pressure of cast-in-place concrete on the formwork. The "Safety Technical Specification for Building Construction Formwork" (JGJ162-2008) gives two formulas, one is the influence formula of coefficient, One is the liquid pressure formula. The building accidents caused by the lack of supporting force of the formwork often occur, which bring great economic loss and threaten the human life. As the concrete structure is used more widely, The application and research of formwork in construction is more and more important, and the research of formwork side pressure becomes an important work of formwork engineering. The study of formwork side pressure not only provides safe data for formwork construction, In this paper, based on the field test, the data collected from the earth pressure box distributed at different heights and at the same height are used as the basis of the field test. The calculation values of the two formulas given by JGJ162-2008 are compared with the actual stress values of cast-in-place concrete. It is found that the calculated values are compared with the calculated values according to the experimental values and the calculated values. The maximum pressure value of the actual cast-in-place formwork is close to the liquid pressure formula given in the specification. The application of liquid pressure formula during construction can provide reliable support measures for formwork construction. In the actual construction process, JGJ162-2008 suggests that two formulas should be used to calculate the value of the safety technical code for building construction formwork. The research results of this paper will provide reliable calculation basis for actual construction and provide basis for revision of current formwork specification. Provides the reference for the construction plan determination.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU755.2

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