The Climbing Jack System (capacity up to 600 ton) is based on heavy duty double acting hydraulic jacks. The system allows the lifting or lowering of loads over long distances in stages determined by the stroke of the jacks. The system is powered by a power pack unit that is dimensioned to simultaneously feed the number of jacks in the system. By leverages on the console the operator can pressurize any jack singularly. Each jack is able to push and pull and is assembled in a steel frame and connected to it by screws on the top plate. The jack can freely extend inside the structure. By supporting the structure with cribbing material its outside the jack can lift itself in the close position and be ready for the next step of the lifting. Here below a description of the lifting sequence: 

The climbing jack is interposed between the lifting point, as a ‘spreader beam’ and the ground. A steel plate can be used to spread the load. The ram of the hydraulic jack is extended, lifting the cargo for the length of its stroke. Wooden blocks (cribbing) and steel spacers are then placed underneath the jacking structure. The ram is retracted to bring the cargo to rest on the wooden blocks on the outside of the jacking frame. More wooden blocks are then slid under the climbing jack. The ram is extended again, and the spacers removed. This time two outer wooden blocks and spacers are placed at right angles to the previous ones to form a stable tower. The ram is retracted again and more wooden blocks slid into place.