| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an underground anchor by which extraction resistance force immediately after setting can be expected and an anchor head can engage with an inner wall surface of an excavated hole reliably with simple construction. <P>SOLUTION: An underground anchor 1 comprises: an anchor steel material 4 consisting of a fully-threaded steel bar inserted and installed in an excavated hole 3 formed in natural ground 2; a spherical convex nut 9 threadedly engaged with the tip of the anchor steel material 4; and an anchor head 5 with a diameter extended like a flower and larger than that of the excavated hole 3. Cylindrical bodies constituting the anchor head 5 have a substantially truncated cone shape with slits on the side and are installed in the hole in the state they are stacked in a plurality of stages and the anchor steel material 4 is inserted therein. A cylindrical unit compressed and deformed in the excavated hole 3 exerts high pressing force with its outer periphery against the wall of the hole to increase extraction resistance force. <P>COPYRIGHT: (C)2012,JPO&INPIT |
