Abstract: Elevating device for an artificial island or work platform comprising a pontoon 1 or work floor and a number of columns 2 displaceable in vertical direction with respect to the pontoon respectively or work floor by means of the elevating device. At each column 2 the elevating device consists of a number of driving devices having pinions 7-10 meshing with gear racks 3, 4 fixed along the columns 2. In particular concerning its bearing the shafts of the pinions 7-10 are fixed to the pontoon 1 or work floor and consist of a motor, a driving gear and a brake. Each driving device is fixed to respectively form part of a reaction arm 11-14 pivotal around the axis of the output shaft of the driving device. At their one ends 15-19 the reaction arms 11-14 are coupled to the pontoon 1 or work floor through hydraulic cylinders 23-26.

Abstract: A walking platform construction comprises a barge or work platform and a plurality of legs movable in a vertical direction and securable with respect to the barge or platform. The barge or platform has a plurality of independently movable auxiliary frames each comprising one or two legs movable and securable in vertical direction with respect to the auxiliary frame. Each auxiliary frame is disposed in a rectangular recess of the barge or platform and movable within the recess in the longitudinal direction of the recess as well as in a transverse direction. In the case in which the auxiliary frame is a long rectangular frame having two legs, each end of the frame has means to move this end in a transverse direction to the frame's longitudinal axis.