Double rotary drilling combines continuous flight auger drilling with a continuous casing.
In addition to drilling with a double rotary drive, the LRB 355 can also be used for all other common drilling methods, for example, Kelly drilling, full displacement drilling or continuous flight auger drilling.
For auger and continuous flight auger
piles, the ratio [Qu.
The Federation of Piling Specialists (FPS) has issued a guidance document designed to highlight situations where piling rigs can become unstable through over-flighting during continuous flight auger
The Blackwall Tunnel runs under the site; and continuous flight auger
piles into the clay had to be used in places adjacent to it.
Nominal depth ratings are: continuous flight auger drilling - 25 m at 100 mm dia; rock roller/drag bit drilling 30-40 m at 100 mm dia.
All are top head drive with integral low speed (0-150 rev/min) for high torque drilling with continuous flight augers, rock roller/drag bits and RAB DTH hammers, together with high speed (0-1,250 rev/min) for diamond drilling.
Like all rigs of the LB series, the LB 36 has been specially designed for Kelly drilling, drilling with double rotary head, continuous flight auger
as well as for soil mixing applications.
The rig can, however, be used for numerous other applications including drilling with Kelly equipment, double rotary head and continuous flight auger
, soil mixing as well as piling jobs with vibrator and hydraulic hammer.
For the new simulator, the LB 28 rotary drilling rig with continuous flight auger
(CFA) and Kelly bar as well as the LR 1300 crawler crane have been modelled.