PURPOSE: A construction method of an Airpit slab capable of being changed in non-rotation type construction or in damage is provided to shorten a protruding length of a mounting bracket and to easily change the Airpit slab when the Airpit slab is damaged. CONSTITUTION: Two or more wing supports(20) comprising a fixing plate and a rotary shaft are installed on both ends of a precast Airpit slab. The Airpit slab is lifted when a rotary plate of the wing support. The rotary plate is spread out at a right angle on the fixing plate and is supported by a mounting bracket(5). Concrete(40) is placed and attaches the mounting bracket and the Airpit slab.
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