| 摘要 |
The present invention, in an anchor bolt (20) which is applied to an anchor cage (10), comprises a jacket tube (30) which is made of a steel pipe material with being concentrically spaced from an outer circumferential surface of the anchor bolt (20) at a predetermined distance for airtightness to be maintained. Therefore, when transporting an anchor bolt which has a jacket tube, or after installing the anchor bolt, there is no damage in a solidification process of cement, and the degree of freedom of the anchor bolt is ensured for ability to withstand a fatigue load to be improved. |
