Hollow Stem Sectional Auger

Hollow Stem Sectional Auger pile bores are formed with the use of sectional lengths of hollow stem continuous flight auger. Each section, commencing with a toothed lead length is added to the rig as the augers are bored into the ground. When the required depth is reached, grout is mixed and pumped through the hollow stem of the augers as they are extracted and removed. The grout is cast to the platform level before a reinforcement cage is inserted. At no time is an open bore formed, thus piles can be made in wet unstable ground conditions.

The piling rigs can be from 3 to 15 tonnes in weight forming piles from 250 to 600mm diameters. It is possible to work in 3.2m headroom or less with the smaller rigs being only 1m wide.
If the site is big enough we can use our concrete agitator and pump.