Rotary Drilling Rig is essential for
foundation drilling for large diameter
(600~2500mm) piles. This equipment is
in use when drilling a borehole through
soil and soft rock strata for construction
of foundation for large buildings, long
bridges, and other large scale constructions.
drilling rig
Kelly bars have been designed to transfer
the torque and pressure onto a drilling tools,
so there must be treated with extreme care,
especially know the maximum permissible torque
for it and adjust the power of rotary drive
not to exceed the regulated torque. drilling rig
There are two types of Kelly bars, one is
with spring housing(2) and the other is without
spring housing(1) drilling rig
General 
Emai: