Is the stair installer tired?

Tired, because I have to lift the main body.

1. Stairs: components used for vertical traffic between floors of buildings.

2. Used for the traffic contact between floors and when the height difference is large. Multi-storey and high-rise buildings with elevators and escalators as the main vertical means of transportation should also be equipped with stairs.

3. Although elevators are the main vertical means of transportation in high-rise buildings, stairs should still be reserved for escape in case of fire.

4. In assembled buildings, stairs are mainly divided into shelved stairs and anchored stairs, and assembled reinforced concrete stairs are divided into three parts: rest board, stair beam and stair section.