| 摘要 |
A permanent type anchor is provided to simplify the product with reduced weight and diameter by encircling each steel strand for prestressed concrete individually with a hollow spiral anchoring steel pipe and a PE(Polyethylene) pipe that are connected by a heat shrinkable tube. In an anchor, a steel strand for prestressed concrete(150) is inserted in a ground hole by a grout is anchored on a ground structure by using a base plate, an upper anchor head, an upper fastening member, a lower anchor head, and a lower fastening member. Each steel strand for prestressed concrete made of a plurality of strands is encircled by a pipe unit individually and fixed to the upper and lower anchor heads. The pipe unit comprises a hollow spiral anchoring steel pipe(114), a PE(Polyethylene) pipe(115), and a heat shrinkable tube(118). The hollow spiral anchoring steel pipe has a hollow portion on its lower side encircling a lower part of one steel strand for prestressed concrete fixed to the lower anchor head, and a surface of the anchoring steel pipe is uneven. The PE pipe extending on the hollow spiral anchoring steel pipe, encircles the rest of the steel strand for prestressed concrete. |
