Modular building construction

A building construction module made as three-dimensional frame structure shaped like polyhedron including a floor (20), a ceiling (21) and at least two walls (22) connected together characterized by that the floor (20) and the ceiling (21) are grids each one made of intersecting, through slots (3), flat elements (1) having free slots (3) in at least one direction along the module width or length of at least one of the grids of the ceiling (21) and/or floor (20) and the grids are made so that the floor grid (20) of one module can penetrate in the ceiling grid (21) of another module by intersecting through the free slots (3) of the corresponding flat elements (1);

• at least one of the grids of the floor (20) or the ceiling (21) comprises first flat elements (1) with slots located at equal distances n from each other;
• at least one of the grids of the ceiling (21) and/or floor (20) comprises second flat elements (1) with slots located at distance b from each other where the ratio n:b is within the range from 1:1 to 1:10, and the second elements (1) with slots at distance b are located in different direction towards the first elements (1) with slots at distance n;
• the slots (3) at the ends of at least two flat elements (1) of the grids of the ceiling (21) and/or floor (20) are at distance h, equal to at least 0.5c, from the edge of the short side (5) of the element;
• furthermore, it comprises at least two walls (22) connecting the floor and the ceiling being grids made of connected through slots (3) standing (26) and horizontal (27) flat elements (1) along the height and width of the walls (22) accordingly, so that the corresponding horizontal elements (27) lay at equal distances from the floor (20) thus forming different levels;
• and the ends of at least two standing elements (26) are connected at an angle to the ends of the corresponding elements (1) of the floor (20) and the ceiling (21).