地下洞室群施工排烟竖井辅助通风的设计

Design of Auxiliary Ventilation of Smoke Exhaust Shaft for Underground Cavern Group Construction

依托河北丰宁抽水蓄能电站一期工程,针对抽水蓄能电站地下厂房系统埋深大、洞室掘进距离长、开挖施工阶段通风散烟困难等突出问题,通过对施工通风的分期特点进行分析,最终采用在通风一期增设排烟竖井、井口安装轴流抽风机进行辅助通风的优化设计,达到了加速洞内空气循环,使洞室内污染空气按预定的通道快速排出洞外,有效改善施工作业环境,保障作业人员职业健康。

Based on the Phase I Project of Fengning Pumped Storage Power Station in Hebei Province,aiming at the prominent problems such as large buried depth of underground powerhouse system,long excavation distance of cavern and difficulty in ventilation and smoke dispersion during excavation and construction stage,the staged characteristics of construction ventilation are analyzed.Finally,the optimization design of auxiliary ventilation is carried out by adding smoke exhaust shaft and installing axial-flow exhaust fan at wellhead in ventilation phase I,which accelerates the air circulation in the cavern,makes the polluted air quickly discharged out of the cavern through the predetermined channel,effectively improves the construction environment and ensures the occupational health of the operators.