GB819820A - Improvements in and relating to foundation pile, cylinder and like driving and withdrawal - Google Patents

Abstract

819,820. Driving and withdrawing piles. BRAITHWAITE & CO. ENGINEERS Ltd. Aug. 7, 1957 [Aug. 31, 1956], No. 26628/56 Addition to 755,427. Class 68(2) In a modification of the parent Specification, the tangentially arranged inclinable means is adapted to provide the power for a rotational drive which it delivers to the pile. As shown, the means comprise one or more power devices such as hydraulic cylinders 2a, 2b, arranged substantially in the same way as the transmitting means of the parent Specification, except that they are pivoted at 4a, 4b to a fixed frame 1. Associated with the frame 1 is a driving ring 3 rotatable and axially movable relatively thereto by the cylinders 2a. 2b with their respective pistons 5a, 5b pivoted at 3a. A clutch collar 6 to grip the pile 7 constructed as described in the parent Specification has a depending sleeve 6a in splined engagement at 6b with the ring 3 to allow relative axial but not rotational movement therebetween, the sleeve 6a being of sufficient length to cover the maximum axial displacement between the collar 6 and ring 3. To lock the ring 3 and sleeve 6a against relative axial movement, spaced holes 6c may be provided in the splines 6b to receive pins by which the ring 3 may be held at a chosen level. A guide ring 8 may also be provided which engages the splines 6b on the sleeve 6a and has a peripheral channel 8a for engaging rollers 8b on the ring 3. The arrangement may be such that rams 2a and 2b may be energized separately to apply rotational drive in either direction or simultaneously to apply substantially the whole force in an axial direction. When the clutch is closed, axial force transmitted to the ring 3 is transferred to the pile 7. When the clutch is open, the ring 3 can be used to reset the collar 6 for re-engagement with the pile in a new axial position.