Abstract: A support structure for supporting a lift crane, and in particular to a lift crane jack-up structures, including rigs, platforms, barges, boats or the like, wherein the lift crane is positioned about a leg of the jack-up structure atop the jack-house. The preferred embodiment of the present invention contemplates a system for elevating a lift crane above the deck and about the leg of the jack-up structure, without relying upon the leg for structural support. A structurally reinforced jack-house having jacking units interfacing with the leg is provided at the deck of the vessel the jack-house configured to engage and support a crane tube column upon the roof of the jack house, which crane tube column in turn has situated thereupon the lift crane.

Abstract: A support structure for supporting a lift crane, and in particular to a lift crane jack-up structures, including rigs, platforms, barges, boats or the like, wherein the lift crane is positioned about a leg of the jack-up structure atop the jack-house. The preferred embodiment of the present invention contemplates a system for elevating a lift crane above the deck and about the leg of the jack-up structure, without relying upon the leg for structural support. A structurally reinforced jack-house having jacking units interfacing with the leg is provided at the deck of the vessel the jack-house configured to engage and support a crane tube column upon the roof of the jack house, which crane tube column in turn has situated thereupon the lift crane.

Abstract: A boat lifting crane includes an annular ring beam mounted on the barge deck of a jack-up rig about one of the vertical openings of the rig that receives one of the legs and its elevating units. The ring provides spacing away from the leg, its opening and its elevating unit so that the ring derives all of its structural integrity from the barge or hull of the jack-up unit. The ring provides upper and lower bearing surface portions. A crane gantry extends about a selected one of the legs and its adjacent elevating units of the jack-up rig, the gantry having front and rear portions. A boom pivotally mounts to the front portion of the gantry. Roller bearings and/or other friction reduction devices on the front portion of the gantry transfer load to the ring upper surface. Hook rollers and/or other friction reduction devices on the rear portion of the gantry transfer uplift load to the ring at the ring lower surface.

Abstract: There is disclosed an improved woven geotextile for use immediately under a pavement overlay. It comprises a high bulk entangled yarn interwoven with tape. It has a shrinkage force of less than 100 gm/inch at 300.degree. F. at constant length in both warp and weft directions, most preferably less than 5 gm/inch.