Assembly building having floor elements supported between superimposed columns

In an assembly building including column elements which are capable of being superposed and have a recessed top for receiving a hollow bottom of a superposed subsequent column element, and a floor element which is clamped between said superposed column elements, wherein the improvement comprises that said floor element is provided on at least one end with a marginal edge including an upstanding flange which is clamped between said recessed top and said hollow bottom of said column elements, when superposed, in a substantially L-shaped continuous space located therebetween, said superposed column elements being spaced at their outer edges a distance substantially equal to the thickness of the marginal edge of said floor elements and the lower inner surface of said hollow bottom being spaced from said recessed top a distance substantially equal to the thickness of said upstanding flange, said hollow bottom including an inwardly extending shoulder, said recessed top having a non-deformable outwardly projecting shoulder at the top thereof, whereby said inwardly and said outwardly extending shoulders located on respective superposed column elements engage and the upstanding flange of the floor element is clamped under said outwardly projecting shoulder, said marginal edge and said upstanding flange each being independently clamped within the vertical and horizontal portions of said L-shaped annular space respectively, and said clamping of said marginal edge and said upstanding flange being effected by interengaging bayonet screw connection means provided on said inwardly and said outwardly extending shoulders.