Patent ID: 8092120

Claim:
Method for assembling a rack portion ( 1 , 2 ) of a self-raising oil rig, which rack portion ( 1 , 2 ) is constituted by at least one rectangular plate ( 3 , 3 ′) which comprises teeth ( 41 , 51 ) at the longitudinal lateral faces ( 4 , 5 ) thereof and at least one reinforcement ( 8 , 8 ′, 9 , 9 ′, 10 , 10 ′) in the form of a half-shell which is welded to a main face ( 6 , 7 ) of the at least one rectangular plate ( 3 , 3 ′), along the longitudinal edges ( 11 , 12 ) of the at least one reinforcement ( 8 , 8 ′, 9 , 9 ′, 10 , 10 ′), characterized in that: an internal chamfer ( 16 ) and an external chamfer ( 15 ) which are separated by a projection ( 17 ) having thickness T are produced at each of the longitudinal edges ( 11 , 12 ) of the at least one reinforcement ( 8 , 8 ′, 9 , 9 ′, 10 , 10 ′), the at least one reinforcement ( 8 , 8 ′, 9 , 9 ′, 10 , 10 ′) is/are provided on a main face ( 6 , 7 ) of the rectangular plate ( 3 ), at least one welding pass is carried out at the internal portion of each of the longitudinal edges ( 11 , 12 ) of the at least one reinforcement ( 8 , 8 ′, 9 , 9 ′, 10 , 10 ′) in order to produce an internal weld bead ( 23 ) having a connection radius R which is greater than or equal to 4 mm, and the chamfers are filled at the external portion of each of the longitudinal edges ( 11 , 12 ) of the at least one reinforcement ( 8 , 8 ′, 9 , 9 ′, 10 , 10 ′) by an external weld bead ( 25 ) which is produced in at least one pass with addition of metal, the internal weld bead ( 23 ) having a degree of interpenetration with the external weld bead ( 25 ).