基于亚安全区的地下换乘大厅防火策略研究

RESEARCH ON FIRE PREVENTION STRATEGIES FOR UNDERGROUND TRANSFER HALLS BASED ON SUB SAFETY ZONES

城市综合交通枢纽的地下换乘大厅具有人流量大、功能流线复杂、多层空间相互连通的特点,防火设计方面常存在超规范的问题。针对地下换乘大厅中防火分区设计、疏散设计和防排烟设计这3方面的防火设计难点,提出应用亚安全区策略以解决此类建筑空间防火设计问题。从火灾荷载要求、防火分隔设计、防排烟设计和安全疏散设计这4个方面分析其作为亚安全区条件成立的技术措施,并阐述了通过性能化设计进行消防安全性论证的方法,最后结合实际工程案例分析了该策略在消防设计上的应用,以期为类似工程提供借鉴。

The underground transfer hall of urban comprehensive transportation hubs has the characteristics of high pedestrian flow,complex functional flow lines,and interconnected multi-level spaces,and there are often issues with fire protection design that exceed standards.Aiming at the fire protection design difficulties in three aspects of fire compartment design,evacuation design,and smoke control design in underground transfer halls,this paper proposes the application of sub safe zone strategies to solve the fire protection design problems in such building spaces.This article analyzes the technical measures that establish it as a sub safe zone condition from four aspects:fire load requirements,fire separation design,smoke control design,and safe evacuation design.It also elaborates on the method of fire safety demonstration through performance-based design.Finally,the application of this strategy in fire design is analyzed based on actual engineering cases,in order to provide reference for similar projects.