APPARATUS TO RE-PRESTRESS GROUND ANCHOR AND GROUND ANCHOR RE-PRESTRESSING CONSTRUCTION METHOD USING SAME

摘要

The present invention relates to an apparatus to re-prestress a ground anchor, which bites a tendon with a short length protruding from the ground, pulls the tendon by a required degree with respect to a ground anchor previously anchored in the ground, and anchores the tendon again to introduce an additional tendon to the ground anchor, and a ground anchor re-prestressing construction method using the same. In particular, the apparatus to re-prestress a ground anchor comprises: a prestress guide plate (5) disposed on an anchoring device (3); a prestressing body (7) put on the prestressing body; a coupler (9) assembled and coupled to the prestressing body (7); a prestressing support plate (10) to transfer repulsive force to the prestress guide plate (5) in re-prestressing; an extensible jack (12); and a tension bar (11) including a coupling fixing member (13). As the tension bar (11), the prestressing body (7), the coupler (9), and the prestress support plate (10) are ascended by extension of the extensible jack (12), additional prestressing stress is introduced to a tendon (1). When the tendon (1) is cut at the lower side of the prestressing body (7), an anchoring wedge (30) is anchored in the anchoring device (3) while biting the tendon (1), and thus a re-prestressing state of the tendon (1) is maintained.;COPYRIGHT KIPO 2019