METHOD OF ROCK ARRANGEMENT OF CEMENT-BOUND PILES Russian patent published in 2010 - IPC E02D5/34 

FIELD: construction.

SUBSTANCE: method for arrangement of cement-bound piles includes drilling well by drilling rig with hollow drilling rod, equipped with mixing drill with cutting and mixing blades, with further injection of cement and water. Injection of powder cement and dispersed water is done separately in compressed air jet under pressure of 3-4 atmospheres. Injection of powder cement is started from drilling depth of 0.5 m under pressure of 0.5 atmospheres, which is evenly increased by 1 atmosphere per each metre of drilled well depth, reaching pressure of up to 4 atmospheres with well depth of 4 m with the ratio of 1 wt part of cement to 3-4 wt parts of soil tilled in well. Then after reaching design depth of well, cement injection is terminated, and even injection of dispersed water is started through hollow drilling rod and drill with pressure from 3-4 atmospheres to 0.5 atmospheres, at the ratio of 0.4-0.5 wt parts of water to 3-4 wt parts of compacted soil.

EFFECT: reduced consumption of components introduced in soil, increased forces of pile adhesion to surrounding soil.