Abstract: A jacking system for jacking a structure, includes a leg having a longitudinal axis and including first engagement parts along the leg, and a guiding frame displaceable along the leg. The guiding frame includes at least a first, second, third and fourth actuator, the actuators each having a first and second actuator part which in operation can displace with respect to one another along the leg, the first actuator part of the actuators coupled to the guiding frame, the second actuator parts of the actuators each coupled to first engagement parts for engaging and disengaging the first engagement parts of the leg for providing abutment in the longitudinal direction of the leg, the second actuator parts of the actuators displaceable along the leg past one another, and the actuators being arranged in pairs opposite one another with respect to a longitudinal plane of the leg.

Abstract: The invention relates to a tie-back system for a crane comprising a rotatable base with a generally vertical support frame and a lifting arm which is with a lower end hingedly connected to the base in a hinge point, an upper part of the frame carrying a displacement member movable relative to the frame, the displacement member carrying a first cable guide means, a first cable extending from a first connection point on the arm along the first cable guide means to a first pulling device. The displacement member comprising a tie connection point for connection to a tie member, a second cable guide means attached to an upper part of the frame and a second cable extending from a second connection point on the arm along the second cable guide means to a second pulling device.

Abstract: Vessel including a hull of a substantially closed surface has at deck level a lifting crane, ballast tanks within the hull and a ballast control unit for admitting water to the ballast tanks for changing the draft of the vessel. The hull has a narrow lower section having first width over a height from keel level to a widening level, and a top section having a larger width than the lower section, extending from the widening level upwards towards deck level. The control unit is adapted to ballast the vessel to have a relatively shallow draft level in a transit mode, so that the wide top section is above water level, while the vessel is traveling, and to ballast the vessel to a relatively deep draft level in a lifting mode so that the widening level is below water level, at least when the vessel is substantially stationary and the crane is in its lifting position.