Can the curved staircase be evacuated?
This is the fire safety requirements:
7.4.7 The steps on the evacuation staircase and the evacuation passage should not be carried out by spiral staircase and fan stepping. When must be used, the upper and lower levels of the formation of the plane angle should not be greater than 10 °, and each step from the handrail 250mm stepping depth should not be less than 220mm.
Can do to evacuate the stairs, but from the end (arc inside) 250, the requirements of the ramp width must be greater than 220MM, in order to do the evacuation staircase.
When must be used, the upper and lower levels of the formation of the plane angle should not be greater than 10 °, and each step from the handrail 250mm stepping depth should not be less than 220mm.
