Prefabricated building and method of making same

A multistory building comprising:

• a fixed base defining a horizontal base surface and provided with a plurality of horizontally spaced polygonal arrays of studs projecting upwardly from said surface;
• a box-like first-floor reinforced-concrete room unit resting on said base surface at each of said arrays and each having a polygonal floor engaging said base, a polygonal ceiling parallel to and above the respective floor, and a perimetric side wall coinciding with the respective array and integral with and extending vertically between the respective floor and ceiling;
• a plurality of upright rods in each of said side walls each having an upper end extending upwardly beyond the respective ceiling and a lower end slightly above the respective floor;
• means including a nut engaged between each of said lower ends and a respective one of said studs for securing each of said room units at its side wall to said base;
• a plurality of upright reinforced-concrete partition panels of the same height as said side walls extending between said room units and subdividing the empty regions between said room units into horizontally separate room spaces;
• a plurality of horizontal reinforced-concrete floor panels bridging said room units above said room spaces;
• means including laterally projecting flanges on said floor panels formed with vertically throughgoing holes through which extend the respective upper ends of the respective rods for securing said floor panels to said room units at said side walls thereof and to said partition panels;
• a second floor such reinforced-concrete room unit on top of each of said first-floor room units;
• a plurality of upright rods in each of the side walls of said second-floor units and each having an upper end extending upwardly beyond the respective ceiling and a lower end slightly above the respective floor;
• means including a plurality of nuts each engaged between a respective upper end of a rod of a first-floor unit and a respective lower end of a rod of a second-floor unit for securing each of said second-floor units at its side wall to the respective underlying first-floor unit;
• a plurality of upright second-floor reinforced-concrete partition panels of the same height as said side walls extending between said second-floor room units and subdividing the empty regions therebetween into horizontally separate second-floor room spaces;
• a plurality of horizontal reinforced-concrete roof panels bridging said second-floor room units above said second-floor room spaces;
• and
• means including laterally projecting flanges on said roof panels formed with vertically throughgoing holes through which extend the upper ends of the respective rods for securing said roof panels to said second-floor room units at said side walls thereof and to said second-floor partition panels.