HRP20160264T1 - Jacking system and method for relative movement of a leg with respect to a platform - Google Patents

Claims (9)

1. A lifting system (1) for a lifting platform (2), with a lifting tower (3) attached to said platform and a plurality of supporting legs (4), for relative movement of one of the legs (4) of the lifting tower (3). in relation to the platform (2), it contains several transverse heads (5, 7, 11), where each transverse head (5, 7, 11) is provided with a leg that operates with a mechanism that is organized in such a way that it works or does not work with a leg (4), and a processor organized in such a way as to control the transverse heads (7, 11) so that the relative movement of the leg (4) is alternately performed by the transverse heads (7, 11), and the lifting system (1) contains two movable transverse heads (7, 11), wherein each movable transverse head (7, 11) is independently movable in the longitudinal direction of the leg by means of at least one actuator (8, 12) and whose movable transverse heads (7, 11) located opposite each other in such a way that one crosshead that moves can act by pushing, indicated in that, the lifting tower (3) is further provided with a fixed crosshead (5) with closing pins (6) which can be received in the recesses of the legs (21) for fixing the legs (4) to the tower (3). 2. A lifting system according to claim 1, wherein the processor is arranged to control the moving crosshead (7, 11) in such a way that while the moving crosshead (7, 11) acts in pulling or pushing, the other crosshead which moves returns to its initial position. 3. A lifting system according to claim 1 or 2, wherein the processor is arranged to control the moving crossheads (7, 11) so that the moving crossheads (7, 11) can occupy a position in which both mechanisms for operating with with the foot they work with the foot (4). 4. A lifting system according to claim 1, 2 or 3, wherein each cross head (5, 7, 11) moves substantially along the entire circumference of the leg (4). 5. A lifting system according to claim 4, wherein each moving crosshead (7, 11) contains three or more actuators (8, 12), preferably six actuators (8, 12). 6. A lifting system according to one or more of the preceding claims, wherein the mechanism for acting with the leg comprises at least two movable closing pins (10, 14) which will be placed in the recesses (21) of the leg (4). 7. A lifting system according to one or more of the preceding claims, wherein one of the movable transverse heads (7) is movable relative to the fixed head (5) by at least one actuator (8). 8. A lifting system according to one or more of claims 1-7, wherein at least one actuator is a hydraulic cylinder, and at least one hydraulic cylinder (8, 12) of each crosshead is connected to the liquid tank (15, 16) in such a way that a predetermined amount of hydraulic fluid can flow into the tank in the position in which the movable crosshead (7, 11) operates to enable a damping effect when the foot (4) touches the seabed. 9. The procedure of relative movement of the foot (4) in relation to the platform (2), which contains steps a) providing a lifting system (1) according to one or more claims 1-8 to a lifting platform (2) having a plurality of legs (4); b) Controlling one movable cross head (7, 11) in action with one of the legs (4) to act in a pulling mode or a pushing mode; c) Simultaneously with step b) controlling the other movable transverse heads (7, 11) so that they return to their initial position; d) Subsequent control of the movable transverse heads (7, 11) to take a position in which both mechanisms for acting on the legs interact with the legs (4); e) Controlling the second movable transverse head (7,11) in such a way as to act on the leg (4) and to act in a way opposite to the way of pushing or the way of pulling; f) Simultaneously with step e) controlling the movable crosshead (7, 11) to stop acting on the leg (4) and return to the initial position; g) Repeat steps b) to f) until the desired relative position of the leg (4) in relation to the platform (2) is achieved.