Discussion on normal ventilation of urban utility tunnel

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.