METHOD FOR BUILDING CAST-IN-PLACE PILES Russian patent published in 1999 - IPC

FIELD: construction engineering. SUBSTANCE: this relates basically to technology of building bases and foundations for various structures. According to method, elongated hollow auger is screwed into ground to required depth with subsequent removing it from ground and simultaneous delivery of concrete mix through hollow in auger. Concrete mix is characterized by cone setting within 20-22 cm, size of aggregate placed under end portion of auger is 5-20 mm. Pressure of concrete mix in end portion of auger during its lifting from ground to be not less than 1.5 atm. Sunken into concrete mix is metal reinforcement framework in which lateral connectors are made in the form of annular pieces of pipe arranged along axis of reinforcement framework at distance from each other being not larger than 30 arithmetic mean lengths of annular pieces of pipe. Reinforcing rods of framework are welded externally to annular pieces of pipe. Ends of reinforcing rods in lower section of framework are bent out at acute angle basically at angle of 15-30 deg. with respect to longitudinal axis of reinforcement framework. Application of aforesaid method improves productivity at erection of piles, ensures reliability and long service life of structure. EFFECT: higher efficiency. 4 cl