Turning mechanism operating alternately in opposite directions to facilitate the driving in or extracting of piles
IT8348716D0
Rotary pile-driving accessory mechanism
US4526242A
Drilling device
ATA816179A
Device for regulating the internal pressure in a pre-drive tube in the manufacture of bored pile, in particular press-concrete pile
JPS5275010A
Apparatus which has driving hammer and pipe for forming concrete or compressed concrete pile in excavated hole of ground and executing method using same
DE2559615A1
Tube for making compacted concrete piles - has piston for intermittent compression of air bolster on concrete
CA931995A
Coupling for pipes
GB1206237A
Rotary oscillating appliance for facilitating the driving or withdrawal of a tube as used in piling and like operations
GB1126867A
Drilling grab
GB1133803A
Method and drill bit for widening the lower end of a drill hole drilled in the earth
CA868670A
Rotary appliance for facilitating the driving or withdrawal of piles, pit-props and the like
CA810059A
Method for broaching the end of bore holes drilled in the earth
