The subject innovation is within, an outer mold and also to be attached stably to the assembled safety railing additional wall and, at the same time, the guide rail of the safety railing construction gaengpom one to be fixed is moved by the slide when the lifting unit to allow give by pouring concrete relates to a fixing device, which is fastened by the inner, has an outer flask, the inner, the fastening element and the fastening bolt embedded in the horizontal and vertical support poles for holding the outer flask in gatchumyeo, the vertical support pole, the outer wall I in forming the construction gaengpom comprising a guide rail that enables be, equipped with side plates to the panel on both sides to be fixed by the engaging element and the fastening element for the buried in a state to be located in the outer wall front, the projecting surface having a through hole at the top of the niche the guide panels and equipped; The guide has a guide space to be moved inside the guide rail moves to the side plate of the panel piece and the guide rail; In the side plates and any rotation to about the hinge pin penetrating the features a ground plane on the back to be jipji surface to the inner surface of the panel, straddling the guide element; Hanger pin to allow by a state penetrating through the side plate of the guide panel batchyeojul the lower end face of the crossing element; Hook piece to allow the inner surface of the guide rail over the upper surface of the cant straddling element; By penetrating the side plates of the guide panel is positioned on the lower hooks convenience straight and is characterized by being a secondary hanger pins to cant over hook side.
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