JIG FOR EQUIPMENT PLACING CONCRETE INTO CAST-IN-PLACE PILES Russian patent published in 1997 - IPC

FIELD: civil engineering, erection of drill poles of small and large diameters for bridge building and civil construction of foundations by method "wall in ground", erection of moorage walls and underwater blocks of water-development works. SUBSTANCE: jig for equipment placing concrete into cast-in place piles includes frame with grippers and drive moving grippers. Frame is composed of two parts: internal closed one 1 and external embracing one 2 which has upper belt 3 and lower belt 4. Internal part 1 of frame is joined to belts 3 and 4 with the aid of shock absorbers 11 for elastic reciprocating motion in vertical plane. Grippers are positioned uniformly along perimeters of both parts of frame and are manufactured in the form of hydrocylinders 5 with rest shoes 6 anchored on free ends of rods of hydraulic cylinders of outer embracing part and clamping shoes 8 on free ends of rods of hydraulic cylinders 7 of internal closed part 1. Drive of grippers has built-in hydraulic accumulators 15 anchored on internal part 1 of frame which is fitted with driving drum 17 accommodating flexible supply pipe-lines of hydraulic motors of vibration exciter. EFFECT: enhanced operational efficiency of jig. 2 dwg