钢壳沉管隧道耐火极限标准与防火保护技术研究——以深中通道沉管隧道为例  

Fire Resistance Limit Standard and Fire Protection Technology of Steel Shell Immersed Tunnel:A Case Study of Shenzhen-Zhongshan Link Immersed Tunnel

作　　者：吴梦军[1,2] 吴庆良 宋神友 曹鹏 WU Mengjun;WU Qingliang;SONG Shenyou;CAO Peng(China Merchants Chongqing Communications Research&Design Institute Co.,Ltd.,Chongqing 400067,China;National Engineering-Research Center for Road Tunnel,Chongqing 400067,China;College of Engineering and Technology,Southwest University,Chongqing 400715,China;Shenzhen-Zhongshan Link Administration Center,Zhongshan 528400,Guangdong,China)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]公路隧道国家工程研究中心,重庆400067 [3]西南大学工程技术学院,重庆400715 [4]深中通道管理中心,广东中山528400

出　　处：《隧道建设（中英文）》2024年第2期257-265,共9页Tunnel Construction

基　　金：国家重点研发计划项目(2018YFC0809600,2018YFC0809603);重庆市自然科学基金(CSTB2022NSCQ-MSX1656)。

摘　　要：为提高我国超大断面钢壳沉管隧道火灾防控水平,以深中通道海底沉管隧道为例,采用热力耦合模拟和材性试验等方法开展钢壳沉管隧道耐火极限标准研究,考虑到龙骨、拼缝等防火构造薄弱环节,进行管节结构和管节接头耐火试验,并提出相应的防火保护技术方案。主要结论如下:1)管节结构的耐火极限标准为火灾时,应将结构内侧钢壳最高温度控制在300℃以内;2)OMEGA橡胶管节接头的耐火极限标准为OMEGA橡胶超过70℃的时间小于2 h,超过100℃的时间小于1 h,且最高温度不得超过150℃;3)GINA橡胶管节接头的耐火极限标准为GINA橡胶超过100℃的时间小于1 h,且最高温度不得超过150℃;4)管节结构可采用35 mm单层防火板L型拼缝,对接面涂热膨胀胶;5)管节接头可采用35 mm防火板+50 mm陶瓷纤维毯双层防火保护体系,龙骨自由端取500 mm,拼缝处采用防火胶封堵。To improve the fire prevention and control level of super-large section steel shell immersed tunnels in China,a case study is conducted on the Shenzhen-Zhongshan link immersed tunnel and the fire resistance limit standard of the tunnel is studied using thermal-mechanical coupling simulation and material property test.When conducting the fire resistance test of the pipe joint structure and pipe joint,the weak links of the fire prevention structures,such as keel and seam,are considered and the corresponding fire protection technical scheme is introduced.The main conclusions are as follows:(1)The maximum temperature of the inner steel shell of the structure should be controlled within 300℃in case of a fire.(2)The time for OMEGA rubber under 70℃and 100℃shall not exceed 2 and 1 h,respectively,and the maximum temperature shall not exceed 150℃.(3)The time for GINA rubber under 100℃shall not exceed 1 h,and the maximum temperature shall not exceed 150℃.(4)The pipe joint structure can use a 35-mm-thick single-layer fireproof board and an L-shaped joint,and the joint surface is coated with a thermal expansion adhesive.(5)The pipe joint can adopt a double-layer fire protection system with a 35-mm-thick fireproof board and a 50-mm-thick ceramic fiber blanket.The free end of the keel is 500 mm,and the joints are sealed using fireproof glue.

关 键 词：深中通道 沉管隧道 钢壳混凝土结构 耐火极限 耐火试验 防火保护 

分 类 号：U45[建筑科学—桥梁与隧道工程]