Method and apparatus for forming concrete piles

Claim 1

IN A PILE SHELL, A PEDESTAL CASING, A RELATIVELY INEXPANSIBLE RIGID RING AT EACH END OF SAID PEDESTAL CASING, SAID PEDESTAL CASING COMPRISING AN IMPERMEABLE METALLIC SLEEVE CRIMPED WITH DEEP FOLDS RUNNING LONGITUDINALLY OF THE SLEEVE TO ADJACENT AN ANNULAR AT EACH END OF THE SLEEVE, EACH ANNULAR FORMED BY CONTIGUOUS PARTS OF THE FOLDS LAID OVER ONTO ONE ANOTHER WHEREBY THE OUTSIDE DIAMETER OF THE ANNULI IS LESS THAN THE MAXIMUM OUTER DIAMETER OF THE SLEEVE BETWEEN THE ANNULI, THE OUTSIDE OF ONE OF SAID ANNULI ENGAGING THE INSIDE OF ONE OF SAID RINGS, AND THE OUTSIDE OF THE OTHER OF SAID ANNULI ENGAGING THE INSIDE OF THE OTHER OF SAID RINGS, MEANS PERMANENTLY JOINING SAID ANNULI AT THE ENDS OF SAID SLEEVE TO SAID RINGS AND SEALING AGAINST LEAKAGE AT THE JOINTS BETWEEN THE SLEEVE AND THE RINGS, A TUBULAR SHAFT CASING HAVING A LOWER END FIXEDLY ATTACHED TO ONE OF SAID RINGS IN SEALING RELATIONSHIP THROUGHOUT THE CIRCUMFERENCE OF THE RING, A FLUID-TIGHT CLOSURE MEANS FIXEDLY ATTACHED TO THE OTHER OF SAID RINGS AND CLOSING THE LOWER END OF SAID PEDESTAL CASING, AND MEANS SEALING AGAINST LEAKAGE AT THE JOINTURE BETWEEN SAID PEDESTAL CASING AND SAID CLOSURE.