To simplify construction, and to prevent corrosion of a head of a lock bolt for a long period of time.
A metal anchoring nut, which is screwed to a head of a lock bolt 4 projecting from a slope 2 to press a bearing plate 10 from above, includes a pressing surface 23 for pressing the bearing plate 10, and a fastening female screw part 31 for being screwed to the lock bolt 4. A cylindrical sheath part 22 covering the outside of the lock bolt 4 is formed integrally with the pressing surface 23 and under the pressing surface 23 so as to project more downward than the bearing plate 10. In the inner peripheral surface of the sheath part 22, at least a region extending by a predetermined length from the lower end is made as a non-threaded part where the fastening female screw part 31 is not formed.
KITAMURA YOSHIHIKO
SHIROTA AKIFUMI
HAYASHI HIROAKI
JP2001090493A | 2001-04-03 | |||
JPH09273397A | 1997-10-21 | |||
JP2009108546A | 2009-05-21 |