What is the difference between running stairs and double stairs?
double Stairs, double stairs, three-run stairs, round stairs, round staircase, mid-column spiral staircase, mid-column spiral staircase, single-run curved staircase, double run arc staircase, cross stairs, scissors Stairs and so on.
more stairs, which in the high-rise public buildings can often see.
Stairs in addition to run by the division, but also by plane form, such as: single run straight stairs, double running staircase, curved stairs, double run parallel stairs (the most common, such as ordinary residential public staircase)
Single run is connected to the upper and lower staircase ladder does not change the direction of the middle, regardless of whether there is a rest platform in the middle; double run is the middle of the rest through the platform to change the direction of the stairs. In addition there are three runs (the middle to change the secondary direction), four runs, run more stairs, which in the high-rise public buildings can often see.
