Ateliers Et Chantiers De Bretagne - A.c.b.

Andre Bourgeois

Daniel Fleury

Jean-Pierre Manesse

A device for positioning and applying tension to a set of rods (5) for holding a partially submerged platform wherein the device includes a metal frame, (12, 13A, 13B, 13C, 13D, 14), means for vertically moving said frame relative to the platform, at least one jack (21 22) of a first type which has a cylinder and a rod, at least one jack (31,32) of a second type which has a cylinder and a rod, the cylinders of the rods being fast to said frame and being disposed in such a way that the rods move vertically, the rod of the jack of the first type being fast to a plate (25) which is provided firstly with an orifice for the rod of the second type of jack to pass through and secondly with means of fixing to the end of the set of rods, the rod of the second type of jack having a stop (31, 32) at its end, the rods of the jacks of both types being of unequal length and being chosen in such a way that the jack of the second type drives the plate only in the platform immersion step. Application to oil well drilling.

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Nantes, France

Andre Bourgeois