共查询到20条相似文献,搜索用时 140 毫秒
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通过对超高层建筑核心筒结构适合先行浇筑施工的施工装备——爬升模架体系构造形式和特点的分析,给出施工选型原则,并根据该原则对核心筒模架施工进行选型分析。爬升模板系统和顶升模板系统是超高层建筑核心筒模架施工的主流装备,在施工安全性能和承载力要求更高的400m以上的超高层建筑结构施工中采用顶升模板系统已成为施工装备的首选。超高层建筑核心筒采用竖向结构与水平结构同时施工工艺具有较大优势,是对施工工期无紧张要求的工程的首选工艺。 相似文献
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For a pipe jacking construction, reducing the soil–pipe interface friction and providing enough jacking force are the most common approach to optimize the construction efficiency. In practice, jacking force is generally estimated by various empirical equations. However, the estimations of empirical equations frequently deviate from the reality. In this study, a model coupling finite element method and a displacement control method were applied to estimate the required jacking force in pipe jacking. Two cases were examined from Central Taiwan, where the primary geological foundation composed of gravel formations. Case A pertained to pipe jacking construction during which sewage pipes with a diameter of 2.4 m were utilized. The monitoring data from this case were used to establish the jacking force estimation model. The jacking force history observed in Case B, in which sewage pipes of 1.0 m diameter were used, was compared with those obtained by the developed model to demonstrate the applicability of the model. The results suggested the developed model can estimate the jacking force with a better accuracy towards the middle and the final stage of the pipe jacking process. 相似文献
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基于顶管施工地面沉降的经验预测模型,对顶管施工所引起的沉降槽进行了分析,结合建筑地基基础所允许的变形值,对顶管施工穿越建筑物的安全性问题进行了研究,推导分析了位于顶管上部及周边建筑物安全与否的计算公式。 相似文献
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为研究超高层建筑顶升模架系统优化设计与现场智能化施工的数字化融合,提高材料使用效率和结构合理性,以西安某超高层建筑中所使用的顶模钢框架结构为对象,采用SIMP插值模型法,约束次桁架悬挑端竖向位移,以减少顶模钢框架结构钢材用量为目标进行优化,依据优化结果对顶模钢框架结构进行设计。应用智能建造与建筑工业化协同发展的研究成果,以拓扑优化设计、系统化安装、智能化施工为实施框架,通过拓扑优化设计结合智能化控制操作等工具,实现基于智能建造的优化型顶模钢框架结构; 系统梳理智能建造各阶段应用,利用施工管理平台,实现基于信息化模型的工程管控。结果表明:优化后顶模钢框架结构在满足约束条件情况下,在提升结构承载能力、刚度的同时,使钢框架自身重量减轻20%,降低了顶模钢框架结构用钢量,提升了钢材的使用效率,加强了拓扑优化设计与现场智能化施工的数字化融合,推动了智能化施工装备的施工应用。 相似文献
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顶进涵下穿铁路可行性研究 总被引:2,自引:2,他引:0
介绍了顶进涵施工方法的优点,结合具体工程实例,对铁路顶进桥涵的施工方法进行了比较,选择了一次顶入法的施工工法,并提出了铁路线路的加固措施,可为顶进涵下穿铁路的施工提供参考。 相似文献
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通过有限元软件建立三维实体模型,对顶管隧道下穿既有桥梁的施工过程进行模拟。文章主要论述顶管隧道施工过程中地面变形规律,分析顶管施工对桥梁的影响,判断顶进过程中,桥梁是否处于安全状态,为顶管隧道施工方案的可行性提供理论依据。 相似文献
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上海污水处理排海顶管工程一次顶进2050m,属于超长距离顶管。由于很好解决了超长距离顶进施工中的减阻泥浆、中继间运用、轴线控制等技术难题,仅用了144天就完成了全部顶进施工如管,创造了同类工程的世界记录。 相似文献
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Pipe jacking (PJ) construction is a highly complex and uncertain process so that performing an accurate risk assessment is essential to the success of a project. This study presents an innovative risk assessment model which combines fuzzy inference with failure mode and effect analysis (FMEA) to improve the effectiveness of existing risk assessment methods for pipe jacking construction. The proposed model maps the relationship between occurrence (O), severity(S), and detection (D) with the level of criticality of risk events in three steps: fuzzification, fuzzy rule-based inference, and defuzzification. A case study of a PJ construction project for water transmission in Shanghai, China is presented to demonstrate and validate the proposed method. A total of 31 potential risks was identified according to the PJ construction procedure and two-round Delphi questionnaire surveys. By using the proposed fuzzy-FMEA approach, the most critical risks in the PJ construction process can be identified, in particular, the shaft structure construction, jacking operation, and steel pipe segments welding. The proposed method overcomes the inherent weaknesses of traditional FMEA method and provides a reliable and distinguishable risk ranking system by properly reflecting the complexity of PJ construction environment. The study also provides a comprehensive risk identification and evaluation tool for industrial practitioners who manage or involve with PJ construction projects. 相似文献