Tool for pulling a tube section from a tube sheet

Claim 1

Tool for pulling heating tube sections from a tube sheet of a steam generator, comprising a threaded pulling mandrel of a given length with threads screwed to the heating tube section and cylinder ring-shaped recesses staggered in the longitudinal direction of said mandrel, a mounting plate fixed to the tube sheet, a hydraulic linear drive having a cylinder fastened to said mounting plate and a first lifting piston, hydraulic clamping means having a cylinder surrounding said mandrel and being fastened to said first lifting piston, means in the form of wedge-shaped clamping jaws having wide and narrow ends and being movable in longitudinal direction of said mandrel for engaging in said recesses in said mandrel over said given length of said mandrel, for engaging said clamping means with said mandrel and for engaging said clamping means with the heating tube section after said mandrel has been pulled beyond said clamping jaws, and second and third hydraulic lifting pistons of said clamping piston, said second lifting piston being in the form of means resting against said narrow ends of said clamping jaws for releasing said clamping jaws and said third lifting piston being in the form of means resting against said wide ends of said clamping jaws for bracing said clamping jaws.