HYDRAULIC HAMMER Russian patent published in 1998 - IPC

FIELD: construction machinery and equipment. SUBSTANCE: this is used for sinking reinforced concrete piles, steel sheet piles, steel pipes, as well as piles of any other type. Hydraulic hammer has body, ram, hydraulic cylinder, hydraulic pump with automatic hydraulic apparatus for operation of hydraulic cylinder. Striking eight is provided with space filled with resilient medium. Located in aforesaid space are two or more plungers which protrude outside beyond striking weight towards pile. Plungers are made in the form of concentrically located central rod-like plunger and outer circular-like plungers which embrace central rod-like plunger and each other. In this case, each plunger protrudes towards pile relative to adjacent embracing plunger. EFFECT: higher efficiency. 6 cl, 5 dwg