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Recently, XX City has introduced protective measures for reserved openings. When the short side dimension of a non-vertical opening is not greater than 1500 mm, a single-layer double-direction rebar mesh with the same reinforcement arrangement as that in the structure should be installed, and this mesh shall be tied and fixed to the rebar in the floor slab surrounding the opening. After formwork removal, measures such as using cover plates or protective railings should be employed, and these must be secured firmly; the reinforced mesh of the appropriate size can only be cut once further work at the opening is affected. This approach indeed eliminates the risk of falls from openings at its root, which is beneficial for safety management. The reinforcement requirements for the reserved openings are the same as those for single-story, two-way reinforced structures; to save on reinforcement materials at the construction site, used reinforcement can be used as a substitute. When cutting the rebar later, it is necessary to seal any exposed rebar; it is best to apply an anti-rust agent followed by covering it with cement mortar. As for how to handle it on site, it depends on how the specific project is approached.
[Sea and River Safety Discussion] series of summary posts – continuously being updated. Everyone is welcome to join the discussions! https://bbs.hcbbs.com/thread-3235104-1-1.html (Source: Haichuan Chemical Forum – Huahai Chuanliu)
Protection for holes still requires mandatory installation of guardrails! Flat protection still poses safety risks; what if one steps on an empty space?
Essential safety warnings are still necessary
There are significant safety hazards in the image; when concrete is poured to the edge of the hole, stepping on empty ground while stepping back can be extremely dangerous.