11 is fitted in advance on the interior surface thereof with a number of circular welded rings 40 the leg 5 is fitted in advance on its exterior surface situated opposite to the sleeve 11 with a number of circular welded rings 41 the rings 41 are offset by about one half pitch in relation to the rings 40 by means of a pipe 42 the pump 29 injects into the annular space 16 separating the leg 5 from the sleeve 11 the concrete withdrawn from the reservoir 30 the same process is repeated for each leg the setting of the concrete locks the platform in its position in an extremely secure manner that is further enhanced by the presence of the rings 40 and 41 as a variant this locking into position of the platform can be achieved by way of using mechanical wedges 12 the three linear winches 26 are dismantled and removed and the crane 25 carries them back on to the barge 21 it should be noted that when this is necessary the legs 23 of the barge 21 can be retracted in order for the barge to be rendered mobile again and to thus enable it to move from one leg 5 to the other and from one ballast 10 to the other the installation of the wind turbine 1 is thus completed the barge 21 can be moved to the installation site of a new wind turbine for example of a similar wind turbine also carried by the barge 20 the installation process described here above makes it possible to undertake construction on dry land of the entire wind turbine and to reduce the cost thereof in fact the legs 5 are simple tubes that.