The placement of the fire exhaust fan is also a big problem. First, the fire exhaust fan cannot be too close to the side wall of the tunnel to avoid affecting the ventilation effect. Make full use of the inclined shaft at the fixed-point rescue station and the fire-fighting exhaust fan at both ends of the tunnel as the passage for feeding fresh air and smoke. The ventilation must maintain the horizontal passage port in a positive pressure state to prevent the smoke flow from flowing into the passage. The ventilation system sends air from the safety tunnel to the accident tunnel through the transverse passage, suppressing the smoke from entering the cross passage and the tunnel without accident, meeting the evacuation personnel entering the cross passage and the safety tunnel against the fresh air, and ensuring the waiting area fresh air. Different types of disaster prevention ventilation are adopted according to different tunnels in the accident.
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