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(1 河北省土木工程災(zāi)變控制與災(zāi)害應(yīng)急重點(diǎn)實(shí)驗(yàn)室, 廊坊 065201; 2 華北科技學(xué)院, 廊坊 065201)

摘要: 整體提升施工技術(shù)逆向運(yùn)用于達(dá)到使用年限或?yàn)?zāi)后受損需要拆除的結(jié)構(gòu)中,將高空的整體結(jié)構(gòu)逆向提升至地面完成拆除,此施工方法具有施工占地面積小、高空作業(yè)量小、安全性高等優(yōu)點(diǎn). 以四川省某批發(fā)市場(chǎng)火災(zāi)后的屋面網(wǎng)架結(jié)構(gòu)為例,針對(duì)基于整體提升技術(shù)的網(wǎng)架結(jié)構(gòu)拆除方法進(jìn)行研究. 通過(guò)有限元軟件 MIDAS Gen,依次選取 4 組、5 組、6 組提升支架方案,分別按照吊上弦螺栓球和下弦螺栓球進(jìn)行模擬計(jì)算,對(duì)比不同提升支架布置方案和吊點(diǎn)方案的變形和內(nèi)力情況. 計(jì)算結(jié)果表明,為減小結(jié)構(gòu)變形和應(yīng)力變化,在對(duì)稱網(wǎng)架結(jié)構(gòu)逆向提升施工中,應(yīng)優(yōu)先設(shè)置雙數(shù)提升支架組數(shù). 同時(shí),對(duì)網(wǎng)架進(jìn)行了不同步逆向提升模擬計(jì)算,得出為避免結(jié)構(gòu)顯著不均衡變形,逆向提升施工時(shí)應(yīng)將不同步量嚴(yán)格控制在 15mm 以內(nèi). 工程實(shí)例應(yīng)用結(jié)果表明,整體提升技術(shù)在屋面網(wǎng)架空間結(jié)構(gòu)拆除施工中效率高,安全可靠,建議同類型工程施工使用此項(xiàng)技術(shù).關(guān)鍵詞: 網(wǎng)架結(jié)構(gòu); 整體提升技術(shù); 液壓同步提升技術(shù); 逆向提升; 拆除施工

中圖分類號(hào):TU745. 2 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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?；究蒲袠I(yè)務(wù)費(fèi)資助項(xiàng)目(3142020019).

第一作者:秦杰,博士,教授,主要從事大跨空間結(jié)構(gòu)研究,Email:qjcumt@ 263. net.

[引用本文] 秦杰,張發(fā)強(qiáng),鞠竹,等. 基于整體提升技術(shù)的火災(zāi)后網(wǎng)架結(jié)構(gòu)拆除方法研究[ J]. 建筑結(jié)構(gòu),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.