(1 河北省土木工程灾变控制与灾害应急重点实验室, 廊坊 065201; 2 华北科技学院, 廊坊 065201)

摘要: 整体提升施工技术逆向运用于达到使用年限或灾后受损需要拆除的结构中,将高空的整体结构逆向提升至地面完成拆除,此施工方法具有施工占地面积小、高空作业量小、安全性高等优点. 以四川省某批发市场火灾后的屋面网架结构为例,针对基于整体提升技术的网架结构拆除方法进行研究. 通过有限元软件 MIDAS Gen,依次选取 4 组、5 组、6 组提升支架方案,分别按照吊上弦螺栓球和下弦螺栓球进行模拟计算,对比不同提升支架布置方案和吊点方案的变形和内力情况. 计算结果表明,为减小结构变形和应力变化,在对称网架结构逆向提升施工中,应优先设置双数提升支架组数. 同时,对网架进行了不同步逆向提升模拟计算,得出为避免结构显著不均衡变形,逆向提升施工时应将不同步量严格控制在 15mm 以内. 工程实例应用结果表明,整体提升技术在屋面网架空间结构拆除施工中效率高,安全可靠,建议同类型工程施工使用此项技术.关键词: 网架结构; 整体提升技术; 液压同步提升技术; 逆向提升; 拆除施工

中图分类号:TU745. 2 文献标志码:A 文章编号:1002-848X(2023)02-0113-07

DOI:10. 19701 / j. jzjg. LS220184

Research on demolition method of grid structure after fire based on overall lifting technology

QIN Jie1,2, ZHANG Faqiang2, JU Zhu2, SUN Zhongkai2

(1 Hebei Key Laboratory of Civil Engineering Catastrophe Control and Disaster Emergency Response, Langfang 065201,China; 2 North China Institute of Science & Technology, Langfang 065201, China)

Abstract: The overall lifting construction technology is reversely applied to the structures that need to be demolished whenthe service life or post-disaster damage is reached, and reverse lift the high-altitude overall structure to the ground tocomplete the demolition. This construction method has the advantages of small construction area, small amount ofhigh-altitude work, and high safety. Taking the roof grid structure after a fire in a wholesale market in Sichuan province asan example, the demolition method of the grid structure based on the overall lifting technology was studied. Through thefinite element software MIDAS Gen, 4 groups, 5 groups, and 6 groups of lifting bracket schemes were selected in turn, andthe simulation calculations were carried out according to hanging the upper chord bolt ball and the lower chord bolt ballrespectively. The deformation and internal force of different lifting bracket arrangement schemes and lifting point schemeswere compared. The calculation results show that in order to reduce the structural deformation and stress change, the evennumber of lifting bracket groups should be set first in the reverse lifting construction of the symmetrical grid structure.Simultaneously, the asynchronous reverse lifting simulation calculation of the grid frame was carried out, and it isconcluded that in order to avoid the significant unbalanced deformation of the structure, the asynchronous amount should bestrictly controlled within 15mm during the reverse lifting construction. The application results of engineering examples showthat the overall lifting technology is efficient, safe and reliable in the demolition construction of the roof grid spacestructure, and it is suggested to use this technology in the same type of engineering construction.

Keywords: grid structure; overall lifting technology; hydraulic synchronous lifting technology; reverse lifting;demolition construction

∗中央高校基本科研业务费资助项目(3142020019).

第一作者:秦杰,博士,教授,主要从事大跨空间结构研究,Email:qjcumt@ 263. net.

[引用本文] 秦杰,张发强,鞠竹,等. 基于整体提升技术的火灾后网架结构拆除方法研究[ J]. 建筑结构,2023,53(2):113-119,147 . QIN Jie,ZHANG Faqiang,JU Zhu,et al. Research on demolition method of grid structure after firebased on overall lifting technology[J]. Building Structure,2023,53(2):113-119,147.