Separately mounted grille on elevator shaft opening and construction method of separately mounted grille

The invention discloses a construction method for a separately mounted grille on an elevator shaft opening. The method includes steps of detaching a shear wall formwork; mounting a crossbeam; placing a bottom beam; placing a baffle plate; mounting upright columns; mounting a top beam; and reinforcing. The construction method is safe and reliable, installation and detachment are simple, transfer use consumption is free, construction cost is lowered effectively, protection to new poured shear wall concrete finished products is facilitated, and the construction method is applicable to shear wall elevator shaft opening in different widths and edge-adjacent holes in different widths.