It means to reserve holes, elevator wellheads, access openings and stairs.

The specific measures are as follows:

(1) The reserved hole on the floor is more than 1.5m, surrounded by a double-layer steel pipe guardrail, with a safety net in the middle pocket, and the hole less than 1.5m can also be tightly closed with wooden boards.

(2) The stairway is protected by double-layer steel pipes, and it is better to use the structural guardrail for protection.

(3) The self-made welded steel bar automatic door (up-and-down opening type) should be adopted at the elevator wellhead, which can be opened and closed and fixed firmly.

(4) A safety protection shed is set up at the upper part of the opening of the construction site.