Mold device for molding a waffle slab and method of manufacturing a waffle slab having chamfers

A construction structure comprising:

• a waffle slab, comprising:
• a plurality of through holes therein and a plurality of connecting structures protruding from four sides of the waffle slab, a protruding portion of each of the plurality of connecting structures being U-shaped or hook-shaped;
• a mold device comprising:
• a plurality of steel molds surrounding the waffle slab, each of the plurality of steel molds having a top surface that has at least one hole therein, the protruding portion of each of the plurality of connecting structures being sandwiched by two corresponding steel molds;
• a plurality of auxiliary devices respectively disposed around four sides of the waffle slab and having through holes corresponding to holes of the plurality of steel molds;
• and
• a plurality of fasteners;
• wherein the plurality of fasteners respectively pass through the through holes of the plurality of auxiliary devices and are fixed into the holes of the plurality of steel molds so that each of the plurality of auxiliary devices transversely connects the top surfaces of the plurality of steel molds.