A floating structure and method for obtaining same. The structure includes a first plurality of tubes and a second plurality of tubes. The second plurality of tubes are inserted into the first plurality of tubes to extend through the upper portion of same, and both sets of tubes are welded together. The ends of the tubes of the first plurality of tubes are closed in order to be used as flotation tanks when the floating structure is fitted out for such use. The method concerns locking the first plurality of tubes in place on the frame, with pairs of holes in each of the first plurality of tubes being aligned, and a corresponding tube of the second plurality of tubes being inserted through each pair of aligned holes by force. Each of the connection portions or parts contained in the tubes are welded on the periphery of the holes.