DEVICE FOR BUILDING PILES IN EARTH Russian patent published in 1998 - IPC

FIELD: construction engineering. SUBSTANCE: this can be used for building cast-in-place piles in industrial and civil engineering and also for compacting earth and improving its structure. Device has form-creating body and located inside it with possible limited longitudinal displacement is striking mechanism with working end of piston-striker protruding beyond striking mechanism. Made in lower part of form-creating body is chamber which is filled with liquid and open at side of striking mechanism. Diameter of chamber neck is equal to diameter of lower end of piston-striker which periodically enters aforesaid chamber during its working stroke. This ensures reliability and improved performance due to reduced peak loads on compacting machine and base vehicle during operation. EFFECT: high efficiency. 1 dwg