Guidelines for the design of foundations Ø 1,8 m 2 to 6 tonnes Guidelines for the design of foundations Ø 2,1 m 6 to 12 tonnes Guidelines for the design of foundations Ø 2,5 m 11 to 21 tonnes Guidelines for the design of foundations Ø 2,8 m 8 to 30 tonnes Guidelines for the design of foundations Ø 3,5 m 14 to 49 tonnes