Study on synchronization control algorithm for automatic tensioning prestress

LV Ying-zhao1, FENG Qing-xiu2, CHEN Guo-qiang1, YAO Hong-liang3

(1. Highway Administration of Hangzhou, Hangzhou 310030, China; 2. School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 3. Shanghai Toehold Civil Engineering Technology Co., Ltd. Shanghai 200092, China)

Abstract: Aiming at the problems of prestressed tensioning artificially, such as large measurement error, retraction value unmeasurable, low both ends synchronization rate, lacking of reliable means of process control and effective methods of inspection and evaluation. In order to solve these problems, the automatic tension control system, mathematical model of tensioning control processes and system were studied in detail. A prestressed automatic tensioning control algorithm based on pressure synchronization was proposed, and the specific control parameters were given. The results show that the system can achieve automatic control of pressure synchronization, and automatic measure and record of elongation, pressure, shrank back shrinkage, and generate various reports automatically as required. The algorithm is practical and high control accuracy, which can meet tension control requirements of prestressed beam and slab, and solve other problems of artificial tensioning. Practice has proved that the pressure synchronization accuracy of the algorithm is up to 2%.

Key words: prestress; automatic tensioning; control algorithm; mathematical model