Patent ID: 7147210
Filing Date: 2006-12-12
Classification: E04G,Y10T

Abstract:
1. A concrete reinforcement cable tensioning system, said system comprising: a concrete reinforcement cable tensioner having a first actuator for tensioning a cable fixed relative to said first actuator and extending through a concrete structure, a gripper fixing said cable relative to said first actuator, and a second actuator for crimping a grommet onto said cable; a first hydraulic line in fluid communication with said first actuator and selectively providing pressurized hydraulic fluid to said first actuator; a second hydraulic line in fluid communication with said second actuator and selectively providing pressurized hydraulic fluid to said second actuator; and a normally closed pilot operated sequencing valve disposed in said first hydraulic line, and having a pilot line in fluid communication with said second hydraulic line for sensing a pressure in said second hydraulic line, wherein said sequencing valve opens to exhaust hydraulic fluid from said first actuator upon the pressure in said second hydraulic line reaching a predetermined pressure, and said predetermined pressure is variably changeable to accommodate different pressures required to crimp grommets on different sizes of cable.