郑州会展宾馆关键施工技术研究与应用

发布时间：2018-04-23 05:16

本文选题：超高层建筑 + 关键施工技术　；参考：《西安建筑科技大学》2011年硕士论文

【摘要】：超高层建筑的兴起为建筑施工技术研究与应用提供了越来越多的机遇与挑战,伴随着超高层建筑“高度更高、规模更大、地下室更深、结构更复杂、功能更齐全”的发展趋势,超高层建筑施工技术的研究与应用也在各个方面取得了突破性进展。本文以超高层施工关键技术为研究对象,依托郑州会展宾馆施工实例,系统分析和总结了国内外超高层建筑发展现状和发展趋势,着重研究了超高层建筑施工中的冬期大体积混凝土裂缝控制、液压自爬模施工和聚羧酸减水剂在超高程泵送中的应用等关键施工技术。主要研究内容如下: (1)系统介绍了郑州会展宾馆建筑、结构设计的新颖之处,并分析了超高层施工过程中的特点与难点,总结了在超高层施工过程中应用的关键技术。 (2)在总结温度应力和温度裂缝的产生机理,以及温度裂缝对大体积混凝土的危害基础之上,通过郑州会展宾馆筏板基础冬季大体积混凝土施工实例,从混凝土的原材料、配合比、施工工艺等方面研究大体积混凝土的温度应力和裂缝控制措施,通过对混凝土水化热温度的监测分析混凝土温度变化的规律。 (3)简要介绍郑州会展宾馆液压自爬模系统的工艺原理、工艺特点和系统组成,以及液压自爬模系统的施工工艺。利用有限元分析软件对支撑液压爬模架体的连梁不同强度等级下的弹塑性极限承载力进行计算分析,确定了不同强度等级下的连梁极限承载力;通过同条件养护试件实测到不同龄期的混凝土强度,得到混凝土强度增长曲线,对连梁龄期强度-连梁极限承载力曲线和混凝土强度增长曲线进行拟合,得到了连梁龄期-极限承载力曲线,从而初步确定了液压爬模架体的爬升时间。 (4)分析了聚羧酸类高性能减水剂的减水机理,提出一种由直接酯化法和自由基聚合反应合成的聚羧酸减水剂(专利号:ZL2009 1 0022978.7),并对聚羧酸减水剂的性能进行了试验研究。通过试验对比验证了由直接酯化法和自由基聚合反应合成的聚羧酸减水剂在配制大流动性高强混凝土时坍落度经时损失较小,具有一定的缓凝作用,引气量较小,对强度增长影响较小,表现出高流动性及高保坍等优点,适合配制用于超高泵送的大流动高强混凝土。
[Abstract]:The rise of super high-rise building provides more and more opportunities and challenges for the research and application of building construction technology. Along with the development trend of super tall building with "higher height, larger scale, deeper basement, more complex structure and more complete functions", The research and application of super-high-rise building construction technology have also made a breakthrough in all aspects. This paper takes the key technology of super high-rise building as the research object, relying on the construction example of Zhengzhou Convention and Exhibition Hotel, systematically analyzes and summarizes the present situation and development trend of the super high-rise building at home and abroad. The key construction techniques, such as crack control of mass concrete in winter period, hydraulic self-climbing formwork construction and application of polycarboxylic acid water reducer in ultra-high range pumping, are emphatically studied. The main contents of the study are as follows: This paper systematically introduces the novelty of the building and structure design of Zhengzhou Convention and Exhibition Hotel, analyzes the characteristics and difficulties in the construction process of super high-rise building, and summarizes the key technologies applied in the construction process of super high-rise building. On the basis of summing up the mechanism of temperature stress and temperature crack, and the harm of temperature crack to mass concrete, through the example of large volume concrete construction of raft foundation in Zhengzhou convention and exhibition hotel in winter, the raw material of concrete is introduced. The temperature stress and crack control measures of mass concrete are studied in the aspects of mix ratio and construction technology, and the law of temperature change of concrete is analyzed by monitoring the hydration heat temperature of concrete. This paper briefly introduces the technology principle, process characteristics and system composition of hydraulic self-climbing die system in Zhengzhou Exhibition Hotel, as well as the construction technology of hydraulic self-climbing mould system. The finite element analysis software is used to calculate and analyze the elastic-plastic ultimate bearing capacity of the connecting beam with different strength grades, and the ultimate bearing capacity of the connecting beam under different strength grades is determined. The concrete strength growth curve was obtained by measuring the concrete strength at different ages and the ultimate load-carrying capacity curve and the concrete strength growth curve were fitted. The age-ultimate bearing capacity curve of the connecting beam is obtained, and the climbing time of the hydraulic climbing die frame is preliminarily determined. In this paper, the water reducing mechanism of polycarboxylic acid superplasticizer is analyzed. A polycarboxylic acid water reducer (patent no.: ZL2009 1 0022978.7) is synthesized by direct esterification and free radical polymerization. The properties of polycarboxylic acid superplasticizer are studied experimentally. The experiment results show that the polycarboxylic acid superplasticizer synthesized by direct esterification and free radical polymerization has less slump loss, lower air entrainment and less retarding effect in the preparation of high strength concrete with high fluidity. It has little influence on the strength growth and has the advantages of high fluidity and high collapse, so it is suitable for preparing high-strength concrete with large flow for ultra-high pumping.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TU974

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