The enlarged cabinet on the stairs is easy to block the line of sight, causing potential safety hazards and narrowing the aisle on the stairs, which is inconvenient for people to pass through.
Stairs can be divided into single-run stairs, double-run stairs and multi-run stairs according to the flight. The plane shape of the steps has straight lines, broken lines and curves. History and development of stairs: With the evolution of nature, human beings gradually embarked on an evolutionary path different from other animals. In order to survive in the harsh natural environment and avoid the attacks of many fierce animals, mountain climbing became the need of early human survival and safety. Therefore, early humans used climbing trees and natural slopes as auxiliary conditions for climbing, and human ancestors were inspired by natural conditions, resulting in the prototype of ladders. According to the views of scholars from all over the world, it is believed that the emergence of ladders or stairs is inspired by the above two aspects, forming the trunk method and slope method. The former is a ladder and the latter is a step. With the development of human civilization, ladders and steps have become necessary functional conditions in buildings with floors.