Method for manufacturing system floor and floor base for system floor

A system floor, comprising:

• a rectangular floor base having four corners and having a convex prop, integral to said base, at each of said corners and at a central portion thereof, each of said props having a concave portion on an upper surface of said props, each of said props further having a support position;
• a height adjusting part, embedded in said concave portion of each of said props at the corners of the base, for variably adjusting a height of the support position of each of said props at the corners of the base within a predetermined range between a position lower than the upper surface of the prop and a position higher than the upper surface of the prop;
• an electrical part embedded in said concave portion of said prop at said central portion;
• and
• a floor panel which has four corners and is supported by each of said props, said floor panel having a through hole at each of said corners through which the height adjusted part of each of said corners is accessed to adjust the support positions of said props, said floor panel further having a hole portion through which the electrical part is accessed.

A method for constructing a system floor, comprising the steps of:

• forming props which are integral with a base of a skin formed of a rectangular resin sheet by forming convex portions on at least four corners of the base of the skin formed of the rectangular synthetic resin sheet, forming a first concave portion on an upper surface of each of said convex portions, and forming a second concave portion in a lower surface of each of said convex portions;
• strengthening said props by placing the base such that said second concave portions face upwardly, and packing and hardening concrete in each of said second concave portions;
• and
• arranging said base such that said first concave portions face upwardly and said second concave portions face downwardly, inserting a height adjusting part in each of said first concave portions which are facing upwardly, and placing a panel on said height adjusting parts.