The resultant protection wall (1) is highly resistant and can withstand large forces.

The invention is applicable to large diameter preloaded hybrid ball bearings, to absorb axial loads, and in particular for equipping swashplates of helicopters.

The panel-reinforcing element (10) has an upper portion forming a step region (12) which extends below the upper portion (9) of the panel (8) and which is able to absorb substantially vertical forces.

The stiffness of an Outremer is incomparable: the main bulkheads are of large dimensions, and so are able to take much greater loads than a cruising multihull might encounter.

The building material (6) can be rapidly and advantageously hardened by means of a drainage device, in particular drainage boreholes (49, 50), and therefore a structure of this type can absorb high supporting forces.

A safety cab (2) secured to the frame of the machine (1) is equipped with L shaped outside safety bars (3) which receive forces and which are secured to the safety cab (2) and to the machine (1).