特长城市道路水下隧道防排烟方案设计

The Scheme Design for Resistance Discharge Fume in Extra-long Subsea Tunnel of City Roadway

研究目的:隧道防排烟是隧道设计中的重点和难点,如何合理的设置防排烟系统不仅关系到隧道设计的成败,同时也关系到人民生命财产的安全。本文结合一水下特长隧道,研究如何选择合理的隧道防排烟设计方案,并为其他隧道设计提供借鉴。研究结论:根据隧道所处路网、隧道内防灾救援设施的设置及交通状况、通风系统设置等实际情况,分析隧道不同路段灾害发生概率及造成损失的可接受程度,吸收性能化消防设计理念,对重点防灾地段采用横向重点排烟方案、对一般地段采用纵向综合排烟方案。并将民用建筑的防排烟设计理论引入到隧道防排烟设计中,完善了隧道防排烟设计理念。通过分析服务隧道和气流、人流组织情况,取消了服务隧道的正压设计,使隧道防排烟方案技术经济上更加合理。

Research purposes： The resistance and discharge fume is the major and difficult part in the tunnel design. The rational design for the resistance and discharge fume system is in connecting with the tunnel design success - fail and the people＇s lives and property. Take the lengthy submarine tunnel for example, this paper studies how to choose rational design for the resistance and discharge fume system and provides referrenc for other tunnel designs. Research conclusions：According to the tunnel＇s road net, resistance and recovery facilities＇layout, traffic eonation, ventilation system,this paper analyzes the fire probability in the different regions and the accepted extent of loss and absorbs the concept of performance fire control design. The transverse ventilation was adopted in the important fire resistance position and the comprehensive discharge fume scheme on the base of longitudinal ventilation in the general position. The resistance and discharge fume theory of civil architecture was taken in the tunnel＇s resistance and discharge fume design, and the tunnel~ resistance and discharge fume theory was perfected. By analyzing the service tunnel, air flow and personal dispersal, the service tunnel＇s positive pressure design was cancelled to make the tunnel＇s resistance and discharge fume scheme on economic technique more proper and feasible.