城市综合管廊正常通风的探讨
Discussion on normal ventilation of urban utility tunnel
摘要：
城市综合管廊通风对保障工作人员的人身安全至关重要。GB 50838—2015《城市综合管廊工程技术规范》对管廊的通风系统设计作了技术规定，GBZ/T 205—2007《密闭空间作业职业危害防护规范》规定了氧气安全浓度限值。结合2项国家标准，以综合管廊内氧气浓度满足工作人员安全为重点，分析了影响氧气浓度变化的因素，建立了廊内氧气初始浓度与通风时间及通风过程中空气状态变化与氧气浓度的关系，给出了设计应注意的问题及正确制定运行方案的建议。
Abstract：
The ventilation of urban utility tunnel is very important to ensure the safety of the staff. The standard GB 50838—2015 Technical code for unban utility tunnel engineering makes technical regulations for ventilation system design of utility tunnel, and the standard GBZ/T 205—2007 Specification of prevention and control on occupational hazards in confined space sets the safety limit for oxygen concentration. Combining the two national standards, focusing on the oxygen concentration in utility tunnel meeting the safety of the staff, analyses the factors affecting the oxygen concentration change. Establishes the relationship between the initial oxygen concentration in tunnel and the ventilation time and the relationship between the air state change in ventilation process and the oxygen concentration. Puts forward the problems deserving to be noticed in the design and the suggestions for correctly formulating the operation plan.
Keywords:utility tunnel, ventilation, normal ventilation rate, safe oxygen concentration, necessary ventilation time, air temperature rise