PC STEEL TENSION ADJUSTMENT JIG AND PC STEEL TENSION ADJUSTMENT METHOD
To reduce tension of PC steel in existing PC structures.SOLUTION: A PC steel tension adjustment method includes: a setting step in which a reaction force pedestal is brought into contact with a bearing plate, a hydraulic jack is set on the reaction force pedestal, and an excess length of a PC steel...
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Zusammenfassung: | To reduce tension of PC steel in existing PC structures.SOLUTION: A PC steel tension adjustment method includes: a setting step in which a reaction force pedestal is brought into contact with a bearing plate, a hydraulic jack is set on the reaction force pedestal, and an excess length of a PC steel whose set amount of the PC steel is corrected by a ring nut method is connected to the hydraulic jack via the reaction force pedestal; a tension increase step which increases tension of the PC steel until a ring nut separates from the bearing plate; a ring loosening step which loosens the ring nut separated from the bearing plate; a tension reduction step which reduces the tension of the PC steel to predetermined tension; a ring tightening step which tightens the ring nut until the ring nut abuts on the bearing plate when the tension force of the PC steel decreases to a predetermined tension; and a removal step which releases the tension by the hydraulic jack, and removes the reaction force pedestal and the hydraulic jack.SELECTED DRAWING: Figure 10
【課題】既設PC構造物においてPC鋼材の緊張力を減少させる。【解決手段】支圧板に反力架台を当接させて反力架台に油圧ジャッキをセットして、リングナット方式でPC鋼材のセット量が補正されたPC鋼材の余長部を反力架台を経由して油圧ジャッキに連結するセットステップと、支圧板からリングナットが離隔するまでPC鋼材の緊張力を増加させる緊張力増加ステップと、支圧板から離隔したリングナットを緩めるリング緩めステップと、予め定められた緊張力までPC鋼材の緊張力を減少させる緊張力低下ステップと、予め定められた緊張力までPC鋼材の緊張力が減少するとリングナットが支圧板に当接するまでリングナットを締め付けるリング締め付けステップと、油圧ジャッキによる緊張力を開放して、反力架台と油圧ジャッキとを取り外す取り外しステップと、を含む。【選択図】図10 |
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