储煤场三边支承大跨拱形钢网架顶升修复施工研究
Research on Jacking Repair Construction for a Large-Span Arched Steel Grid Structure with Three-Sided Supports in a Coal Storage Yard
针对某储煤场三边支承大跨拱形钢网架无法正常安装就位的问题,本文分析了施工过程中网架的位形变化,对施工过程进行了数值模拟分析,并将结果与现场实测数据对比,分析施工偏差累积程度,指出了网架无法正常安装就位的原因;提出了对已施工但偏差较大的网架增设临时支撑点进行顶升修复及校正、对后续施工网架设置临时支撑点的高空散装的施工方法,对28种临时支撑点布置方案下的顶升修复及后续安装过程进行了数值模拟研究,并确定了临时顶升支撑架的设计荷载,综合考虑多种因素后,选取了较为稳妥的临时支撑布置方案作为后续PLC控制计算机整体顶升修复施工的依据;在施工中,根据PLC系统实时反馈的信息确定了顶升控制及既有网架复位的基本原则和方法,验证了基于工程实践经验提出的在续装界面上网架竖向位移偏差控制建议值的合理性。
For a large-span arched steel grid structure supported on three sides in a coal storage yard that could not be installed normally, this paper analyzed the changes in the position and shape of the grid structure during construction, numerically simulated the construction process, compared the results with the measured data on the site, analyzed the accumulation of construction deviations and identified the reasons for the installation difficulty, put forward the proposal of the construction of the construction. A method was proposed in which additional temporary support points were arranged for jacking repair and correction of the constructed grid structure with large deviations, and were also arranged for the subsequent high-altitude assembly of the remaining grid structure. Numerical simulations were conducted for the jacking repair and subsequent installation processes under 28 temporary support layouts, and the design load of the temporary jacking support frame was determined. After comprehensively considering multiple factors, a relatively stable temporary support layout was selected as the basis for the subsequent PLC-controlled overall jacking repair construction. During construction, the basic principles and methods for jacking control and resetting of the existing grid structure were determined according to real-time feedback from the PLC system, and the rationality of the proposed control value for vertical displacement deviation of the grid structure at the continuation installation interface was verified based on the engineering practice.
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