Drilling equipment for boring holes in foundation pile for e.g. building, has tool or intermediate piece extended through transverse bore, and another transverse bore arranged in middle part of walls in relation to cross section of rod

摘要

The equipment has a bolt (3) connecting a Kelly rod (2) with a tool or intermediate piece (1) and displaced by drive cylinders. The tool or intermediate piece is inserted into the Kelly rod and integrally formed by a pin (12). The tool or intermediate piece is extended through a transverse bore (11). Another transverse bore (21) is arranged in a middle part of four walls (22) in relation to a cross section of the Kelly rod. The drive cylinders are arranged at the Kelly rod parallel to the walls. A spiral groove or spiral slot (24) is provided into a guide sleeve (23). The tool is designed as a core drill bit, a drilling bucket or a cleaning device.