Application of long spiral drilled press-grouting super-fluid concrete foundation pile;

Pressure pumped CFG pile by continuous auger drilling is a new technology developed in recent years, which is widely applied in nationwide.

By burying pore water pressure gauges at the side of the piles,the variation discipline of the pore water pressure in saturated powder soil around piles is studied,and the mechanism of deformation displacement of soil body around piles caused by constructions during the process of construction of the pressure pumped CFG pile by continuous auger drilling is discussed.

The industrial test, including three kinds of drilling technological methods, continuous flight auger boring, ramming and displacing drilling, pneumatic percussive rotary drilling, proved that it s all technical parameters have been strictly examined, the rigs designing quality requirements had been fulfilled and it can suit the needs of our country s anchor con.