| 摘要 |
A construction method for reinforcing a structure by applying multistage tensile stress to one tendon is provided to reduce construction period, to reinforce a center of a bridge, and to prevent concentration of stress at both ends of the tendon by applying prestress according to internal stress. A couple of end anchorage brackets(10a,10b) are installed at both ends of a construction range for applying prestress longitudinally to a structure, and a couple of first middle anchorage brackets(11a,11b) are installed and spaced from both ends of the construction range. A tendon is inserted to penetration holes of the anchorage brackets, and strained at both ends by using a strainer. The strained tendon is installed in the first middle anchorage brackets, and mounted in the end anchorage brackets by gradually relieving tension of the strainer. A couple of second middle anchorage brackets(12a,12b) are installed and spaced from the first middle anchorage brackets before straining at the maximum tension, and the tendon is mounted in the second middle anchorage brackets. A couple of third middle anchorage brackets(13a,13b) are additionally installed to increase the load bearing capacity. |
