公路隧道过火衬砌结构安全分析及处治措施探讨
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摘要
为查明火灾对隧道衬砌的影响程度及采用何种处治措施较为有效,以历经火灾事故的淘金山隧道为例,对隧道过火衬砌进行外观病害检测,以及对衬砌内部承载力进行安全计算分析,基于表观检测和应力计算分析,采用喷射混凝土联合钢筋网对受损衬砌进行处治,以修复和加固受损二次衬砌,并对喷射混凝土及周边熏黑的段落进行人工打磨、平整表面,对外观进行修复改善。经处治后的受损衬砌安全系数达到公路隧道设计规范要求,该处治措施有效、快速、经济,确保隧道恢复安全营运。
This paper is aimed at finding out fire impact on tunnel lining and its treatment measures.Taking Taojinshan tunnel after the fire accident as an example,the appearance of the tunnel overfire lining is detected,and the internal bearing capacity of the lining is analyzed.Based on the apparent detection and stress calculation analysis,damaged lining is treated by shotcrete combined with the steel mesh to repair and reinforce the damaged secondary lining,and the sprayed concrete and the surrounding blackened sections are manually polished and leveled.The appearance is repaired and improved.The safety factor of damaged lining after treatment meets the requirements of code for design of road tunnel.It is proved that the treatment measures are effective,fast and economical which can ensure safe operation of the tunnel.
This paper is aimed at finding out fire impact on tunnel lining and its treatment measures.Taking Taojinshan tunnel after the fire accident as an example,the appearance of the tunnel overfire lining is detected,and the internal bearing capacity of the lining is analyzed.Based on the apparent detection and stress calculation analysis,damaged lining is treated by shotcrete combined with the steel mesh to repair and reinforce the damaged secondary lining,and the sprayed concrete and the surrounding blackened sections are manually polished and leveled.The appearance is repaired and improved.The safety factor of damaged lining after treatment meets the requirements of code for design of road tunnel.It is proved that the treatment measures are effective,fast and economical which can ensure safe operation of the tunnel.
引文
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[2]卜良桃,陈军,黎红兵.火灾后混凝土结构检测和加固技术研究[J].工业建筑,2009,39(6):117-119.PU Liangtao,CHEN Jun,LI Hongbing.Technology study of detection and strengthening on concrete structure after fire[J].Industrial Construction,2009,39(6):117-119.
[3]张弼伟.火灾后混凝土结构外观情况与烧灼深度的分析[J].山西建筑,2011,37(22):51-52.ZHANG Biwei.On analysis of appearance of concrete structures after fire accidents and scoring depth[J].Shanxi Architecture,2011,37(22):51-52.
[4]王孔藩,许清风,刘挺林.火灾后混凝土结构损伤的鉴定和对策[J].施工技术,2005,34(8):9-11.WANG Kongfan,XU Qingfeng,LIU Tinglin.Appraisal and strengthening of RC structures after fire[J].Construction Technology,2005,34(8):9-11.
[5]郑晴友.钢筋混凝土结构火灾受损评估及处置对策[D].南昌:南昌大学,2015.ZHENG Qingyou.Fire damage assessment and disposal countermeasures for reinforced concrete structures[D].Nanchang:Nanchang University,2015.
[6]郑伟涛.火灾后混凝土结构可靠性分析与处理对策[D].邯郸:河北工程大学,2011.ZHENG Weitao.Reliability analysis and treatment countermeasures of concrete structure after fire[D].Handan:Journal of Hebei University of Engineering,2011.
[7]王慧,宋育锋,徐丹婷.浅析火灾后钢筋混凝土结构加固措施的选择[J].福建建材,2013(8):17-18.WANG Hui,SONG Yufeng,XU Danting.Analysis on the choice of reinforcement measures for reinforced concrete structures after fire[J].Fujian Building Materials,2013(8):17-18.
[8]刘明高,高文学.钢纤维喷射混凝土及其在隧道工程中的应用[J].铁道建筑,2006(2):43-45.LIU Minggao,GAO Wenxue.Steel fiber shotcrete and its application in tunnel engineering[J].Railway Engineering,2006(2):43-45.
[9]张景成,陈文波,杨国承.降低喷射混凝土回弹率的方法[J].煤矿机械,2001(8):12-12.ZHANG Jingcheng,CHEN Wenbo,YANG Guocheng.Method for reducing the rebound rate of shotcrete[J].Coal Mine Machinery,2001(8):12-12.
[10]祝云华.隧道钢纤维喷射混凝土施工技术[J].建筑技术开发,2015,42(1):50-52.ZHU Yunhua.Construction technique of jet steel fiber reinforced concrete in tunnel project[J].Building Technique Development,2015,42(1):50-52.
[11]任康.隧道喷射混凝土施工质量控制[J].交通世界,2013(8):190-191.REN Kang.Quality control of tunnel shotcrete construction[J].Transpoworld,2013(8):190-191.