Abstract: A climbing jack is disclosed, wherein the jack comprises a jack column, and two climbing jack sections, connected by a hydraulic cylinder or a pair of hydraulic cylinders. The jack sections climb along the jack column in a crab-style fashion. Each jack section has at least one pawl which has an axle which extends substantially transversely of the longitudinal axis of the jack column. The pawl has two ends which are adapted by being pivoted about the pawl axle to move either end into biased contact with the jack column, and to thereby engage receiving apertures or projections along the jack column. The pawl ends are biased by opposed biasing springs which selectively bias either one of the ends of the pawl towards the jack column.

Abstract: A method of progressively constructing a wall of cementitious material, including the steps of supporting a formwork support structure on a lower foundation, or completed wall section, by means of hydraulic jacks each including a hydraulic ram assembly carrying the formwork support structure and adapted to climb up a vertically extending jack tube, raising said formwork support structure by said jacks to a higher pouring position, supporting said formwork support structure on the lower foundation, or wall section, by auxiliary support means, raising the jack tubes for each jack through its associated ram assembly, moving a formwork section on the outside of the wall toward a formwork section on the inside of said wall to provide a cavity for the receipt of cementitious material, pouring a quantity of said material into said space between said formwork sections, the lower foundation, or completed wall section, and the lower ends of the jack tubes, allowing said cementitious material to solidify, and moving the

Abstract: Apparatus for progressively constructing a wall of cementitious material, including means for supporting a formwork support structure on a lower foundation, or completed wall section, by means of hydraulic jacks each including a hydraulic ram assembly carrying the formwork support structure and adapted to climb up a vertically extending jack tube, raising said formwork support structure by said jacks to a higher pouring position, supporting said formwork support structure on the lower foundation, or wall section, by auxiliary support means, raising the jack tubes for each jack through its associated ram assembly, moving a formwork section on the outside of the wall toward a formwork section on the inside of said wall to provide a cavity for the receipt of cementitious material, pouring a quantity of said material into said space between said formwork sections, the lower foundation, or completed wall section, and the lower ends of the jack tubes, allowing said cementitious material to solidify, and moving the