I'm having problem with attachment of the metal steps of floating stairs. Each step is round about 5 kgs, but it makes a 90 degrees turn, and the three steps involved on the corner I guess, could be too heavy, like 8-10kgs. These are fully welded on a metal frame on the bolted on two adjacent walls, but the walls could be too weak to carry the whole assembly, as it contains piled hallow blocks (with about 5mm metal bars positioned vertically)

Any suggestion?