混凝土预制拼装塔机安全控制研究与应用

发布时间：2018-04-12 23:30

本文选题：混凝土预制拼装塔机 + 应力应变　；参考：《湖北工业大学》2017年硕士论文

【摘要】：近年来,土木工程中结构的应力和位移监测在施工过程中应用越来越广泛,许多工程项目施工中对结构的应力、应变、温度、位移等相关结构参数进行监测,从而对工程的安全施工提供及时有效的监控及预警。混凝土预制拼装塔机是由塔身和混凝土预制拼装塔机基础组成。混凝土预制拼装塔机基础具有可预制、可运输、可安拆、可重复使用;对环境无污染,绿色施工;对地基承载力特征值要求不高的优点。但是混凝土预制拼装塔机基础是一项新技术,目前混凝土预制拼装塔机只是在江苏、宜昌、山东及安徽等局部地区推广使用,相关的理论研究不多,现场的实测数据少。在前人既有研究成果的基础上,本文结合实际工程项目,对混凝土预制拼装塔机进行了较为深入而且系统的研究。具体研究成果如下:(1)通过对国内与国外关于塔吊安全控制和混凝土预制拼装塔机基础的发展概况及研究现状进行了梳理,从而提出本文研究的主要内容。(2)本文以中共宜昌市委党校(行政学院)迁建工程项目为依托,运用传感器手段在现场混凝土拼装塔吊标准节上埋设应变计,监测塔吊施工使用时的应力应变变化,应用有限元分析软件Midas/Civil建立混凝土预制拼装塔吊塔身结构模型,模拟各种工况下塔身标准节螺栓套附近的主弦杆和水平腹杆的应力变化情况,分析其变化规律,并与实测资料对比,验证数值模拟的合理性以及现场应力监测的可靠性,从而对于塔吊结构的设计、施工有着重要的理论和实践意义。(3)根据现场对混凝土预制拼装塔机基础在施工过程中的位移监测,对监测的数据进行分析和计算,结合基础预应力钢绞线的理论计算,确定合理的张拉紧固时间。(4)通过以上现场监测与数值模拟对混凝土预制拼装塔吊塔身的应力应变对比分析,以及现场监测与理论计算对塔吊塔基的力与位移的对比分析,提出混凝土预制拼装塔机的安全控制技术及措施,为类似工程提供可借鉴的方法。
[Abstract]:In recent years, the monitoring of structure stress and displacement in civil engineering is more and more widely used in the construction process. In many engineering projects, the stress, strain, temperature, displacement and other related structural parameters are monitored.In order to provide timely and effective monitoring and early warning for the safe construction of the project.Concrete prefabricated tower crane is composed of tower body and concrete prefabricated tower crane foundation.The concrete prefabricated tower crane foundation has the advantages of precast, transportable, detachable and reusable, no pollution to the environment, green construction, and low requirement for the characteristic value of foundation bearing capacity.However, the foundation of concrete prefabricated tower crane is a new technology. At present, concrete prefabricated tower crane is only popularized in Jiangsu, Yichang, Shandong and Anhui, etc.On the basis of the existing research results, this paper makes a deep and systematic study on the concrete prefabricated tower crane combined with the actual project.The concrete research results are as follows: (1) by combing the general situation and research status of the safety control of tower cranes and the foundation of concrete prefabricated tower cranes both at home and abroad,Therefore, the main content of this study is put forward. (2) based on the relocation project of Yichang Municipal Party School (School of Administration), the strain gauge is laid on the site concrete assembly tower crane standard festival by means of sensors.The stress and strain change of tower crane is monitored, and the structure model of concrete prefabricated tower crane is established by using finite element analysis software Midas/Civil.The stress changes of the main chord and horizontal web bar near the bolt sleeve of the standard joint of the tower are simulated under various working conditions, and the variation law is analyzed. The rationality of the numerical simulation and the reliability of the field stress monitoring are verified by comparing with the measured data.Therefore, for the design of tower crane structure, construction has important theoretical and practical significance. (3) according to the displacement monitoring of concrete prefabricated tower crane foundation during construction, the monitoring data are analyzed and calculated.Based on the theoretical calculation of prestressed steel strands of foundation, the reasonable tensioning time is determined. 4) through the above field monitoring and numerical simulation, the stress and strain analysis of concrete prefabricated tower crane body is compared.In addition, the field monitoring and theoretical calculation are used to compare and analyze the force and displacement of tower foundation of tower crane, and the safety control technology and measures of concrete prefabricated tower crane are put forward, which can be used for reference in similar projects.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU61;TU714

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