SYSTEM FOR CONTROLLING OF PRESTRESSING FORCE IN POST-TENSION METHOD

摘要

The present invention relates to a system for controlling a prestressing force in a post-tension method, which can apply an even prestressing force to a member by accurately measuring the prestressing force of a tendon and managing the prestressing force applied to multiple tendons using a main server. According to the present invention, the system for controlling a prestressing force in a post-tension method is to control the prestressing force of the tendon installed in a concrete structure. The system for controlling a prestressing force in a post-tension method includes: a hydraulic jacking device connected to the tendon at one end of the concrete structure and applying the prestressing force to the tendon by a forward movement of a piston; a hydraulic pump connected to the hydraulic jacking device and a hydraulic supply pump and supplying a fluid pressure to the hydraulic jacking device; a digital length measuring sensor installed in the hydraulic jacking device and measuring the length of the piston; a measuring unit including a data logger receiving and storing length data measured in the digital length measuring sensor and transmitting the length data to a main server; a digital pressure measuring sensor installed in the hydraulic supply pipe of the hydraulic pump; and a control module calculating the prestressing force by receiving the length data from the data logger or the main server and correcting the calculated prestressing force by correcting an elastic coefficient of the tendon in accordance with a ratio of the length data to pressure data in real time.