METHOD AND DEVICE FOR CAST-IN-PLACE PILE FORMING Russian patent published in 2004 - IPC

FIELD: building equipment, particularly for pile forming and for pile foundation building.

SUBSTANCE: method involves drilling well with ground compaction in radial direction, expanding cross-section thereof by next well drilling and ground compaction in radial direction; filling well hollow with inert material and concrete mixture. Well cross-section is expanded non-uniformly, the greater degree of expansion is along well section in direction to ground massif and to shoulder to be formed. Well is filled with inert material and reinforced concrete up to shoulder level. Device for pile forming includes hammer unit comprising pneumodrill with hole reamer. Hole reamer has oval cross-section. Hammer unit, namely pneumodrill, is secured in transversal direction asymmetrically to lesser axis of symmetry. One surface of hole reamer is made as semi-cylinder, another surface is formed as half of truncated cone with oval base. Minor diameter of oval located in rear device part is equal to cylinder diameter.

EFFECT: reduced power input for well expanding, reduced concrete consumption and increased productivity.

8 cl, 10 dwg