筏板基础大体积混凝土施工技术研究

发布时间：2019-01-23 12:14

【摘要】：近年来,随着我国工程建设规模的不断扩大,高层建筑已在建筑行业占有极为重要地位。筏板基础是高层建筑中常见的基础形式,其板厚较大,属于大体积混凝土结构。由于基础在高层建筑中至关重要,并且基础不断加深、延长,筏板基础大体积混凝土施工技术研究受到广泛重视。裂缝控制是筏板基础大体积混凝土的重点研究方向,本文具体研究了以下几个方面： 1.从施工角度分析筏板基础大体积混凝土裂缝产生特点、原因及控制措施,提出基础裂缝主要为表面裂缝,主要是由于施工期间温度变形与收缩变形较大。文章分别从降低混凝土水化热、提高基础混凝土的抗裂性两方面采取措施预防裂缝的产生。 2.筏板基础大体积混凝土温度裂缝计算。根据工程案例进行系统的温度裂缝计算,并根据计算结果确定养护措施,指导大体积混凝土施工。 3.筏板基础大体积混凝土施工组织、方案及施工工艺研究,重点探讨混凝土温度控制措施,大体积混凝土浇筑、养护措施及温度监测。突出强调了后浇带施工、二次抹压振捣工艺及温度监控技术。在工程案例中,根据现场条件选择相应的施工措施,使施工快速有效开展。 4.筏板基础大体积混凝土施工质量控制。分析影响施工质量的主要因素,对施工质量通病采取预防及处理措施,总结提高大体积混凝土施工质量的主要方面。
[Abstract]:In recent years, with the continuous expansion of the scale of engineering construction in China, high-rise buildings have played an extremely important role in the construction industry. Raft foundation is a common foundation form in high-rise buildings. Its slab thickness is large and it belongs to mass concrete structure. Because the foundation is very important in the high-rise building and the foundation is deepened and extended, the research on the mass concrete construction technology of raft foundation has been paid more and more attention. Crack control is the key research direction of mass concrete in raft foundation. The following aspects are studied in this paper: 1. From the point of view of construction, the characteristics, causes and control measures of mass concrete cracks in raft foundation are analyzed. It is pointed out that the foundation cracks are mainly surface cracks, mainly due to the large deformation of temperature and shrinkage during construction. In this paper, measures are taken to prevent cracks from reducing hydration heat of concrete and improving crack resistance of foundation concrete. 2. Temperature crack calculation of mass concrete in raft foundation. According to the engineering cases, the temperature cracks are calculated systematically, and the maintenance measures are determined according to the calculation results to guide the construction of mass concrete. 3. The construction organization, scheme and construction technology of mass concrete of raft foundation are studied. The measures of temperature control of concrete, pouring of mass concrete, maintenance measures and temperature monitoring are discussed. Emphasis is placed on the construction of the post-pouring belt, the secondary spattering and the temperature monitoring technology. In the engineering case, the corresponding construction measures are selected according to the site conditions, so that the construction can be carried out quickly and effectively. 4. Mass concrete construction quality control of raft foundation. This paper analyzes on the main factors affecting the construction quality, takes the prevention and treatment measures for the common defects of the construction quality, and summarizes the main aspects of improving the construction quality of the mass concrete.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU755

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