Patent ID: 6923598

Claim:
An offshore lifting construction for the lifting of jackets or jacket legs for offshore platforms, the lifting construction comprising: a frame with means for ballasting for raising and lowering the frame, the frame being adapted to take a substantially horizontal raised position and a substantially vertical submerged position in relation to a water surface where a jacket is placed, and including a lower end and an upper end and at least two, in a longitudinal direction of the frame, substantially parallel first longitudinal elements with intermediate supporting elements for the jacket, and the frame being equipped with means for attachment of the jacket that is to be lifted, wherein the frame has a lower tubular transversal unit located at a bottom of the lower end of the frame; the frame includes means for pivotal attachment to a vessel; the lower end of the frame includes at least two substantially parallel second longitudinal elements, each having one free end and one end attached to the lower end of the frame, the at least two substantially parallel second longitudinal elements being substantially perpendicular with the substantially parallel first longitudinal elements and a longitudinal direction of the lower tubular transversal unit, such that the at least two second longitudinal elements and the lower tubular transversal unit are adapted for placing the jacket therebetween during lifting; the substantially parallel first longitudinal elements, the lower tubular transversal unit and the two substantially parallel second longitudinal elements include separate internal ballast tanks; and the frame includes a second frame having the means for attachment of the jacket that is to be lifted arranged at the upper end of the frame, and fixed between the substantially parallel first longitudinal elements.