The Nanjing Dinghuaimen Yangtze River Tunnel is the longest underwater double tube double-layer shield tunnel that has been opened to traffic in China.Considering the current situation of the Dinghuaimen Yangtze River Tunnel without an automatic fire extinguishing sys-tem,from the perspective of tunnel operation safety and disaster prevention and rescue,it is planned to add an automatic fire extinguishing system in the tunnel.Based on the analysis of the research status of the design of automatic fire extinguishing system for underwater tunnels in Chi-na,this paper analyzes the key and difficult points in the design of the new foam/water spray sys-tem for tunnels,and introduces in detail its targeted design solutions and important equipment and facilities in the system,including:the selection of foam nozzles for tunnels,the zoning design of the tunnel foam/water spray system,the site selection of the new fire pump room and fire pool,the setting of fire pipes Summarized the innovative points or highlights in the design of hydraulic calculations,system control requirements,and operational control systems,and finally formed conclusions and prospects.
Underwater tunnelReorganization and expansionFoam/water spray systemAu-tomatic fire extinguishing system
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