How to tell whether it is the first floor, the top floor or the middle floor from the paper stairs ~ that is, the plane type ~ there is an arrow pointing in the direction of going upstairs ~

See the number of stairs according to the elevation of the stair plan.

When the elevation at the end of the upward arrow is the elevation of the first floor of the building and the elevation at one side of the arrow is the elevation of the first floor of the rest platform; Or there is no downward arrow, only an upward arrow, indicating that the floor plan of the stairs is the first floor. As shown in the figure:

When the elevation at the end of the upward arrow is the elevation of the middle floor of the building (except the floors below the top floor); Or when there are both upward and downward arrows, it represents the floor plan of the stairs on the middle floor. As shown in the figure:

When the end elevation of the upward arrow is the floor elevation of the top floor and the next floor; Or there is no upward arrow, only a downward arrow. The elevation at the end of the downward arrow is the elevation of the top floor, indicating the stair plane of the top floor. As shown in the figure:

Extended data

The stair plan needs to show the width and length of the stair surface and the direction of the stairs, while the height can only be displayed on the elevation or marked on the plan.

The information indicated by the annotation of stair plane includes: the direction of stairs (up or down), the elevation of platforms at both ends of stairs, the stair line of stair plane, etc.

The information indicated by the labeling of stair profile includes: the number of stairs, the height and height of stairs, the type and quantity of stairs, the thickness of stairs, etc.

Baidu Encyclopedia-Stair Plan