Method for retensioning the ground anchor

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PURPOSE : A re-tensioning method of a permanent anchor is provided to cut down construction cost, and to improve accuracy by quickly and easily straining a tendon again and minimizing a protruded portion of the permanent anchor after straining. CONSTITUTION : A protection cap for shielding an exposed portion of a tendon of a permanent anchor outside the ground(S1), and a tendon fixing plate is installed in an upper part of the permanent anchor(S2). A re-tensioning fixing unit is mounted in an upper part of the tendon fixing plate(S3), and a tension tool is installed in an upper part of the re-tensioning fixing unit(S4). A piston of the tension tool is connected to the re-tensioning fixing unit, and the tendon of the permanent anchor is strained again by driving the piston up(S5). The tension tool, the re-tensioning fixing unit and the tendon fixing unit are removed(S6), and the re-tensioned tendon is covered by installing the protection cap(S7). The piston of the tension tool is connected to the re-tensioning fixing unit by thread-connecting a male screw part of the re-tensioning fixing unit to a female screw part of the piston. © KIPO 2006