| 摘要 |
<P>PROBLEM TO BE SOLVED: To climb a column without a ladder or a vehicle for high lift work while giving no sense of uneasiness to inhabitants in neighborhood of a concrete column from the viewpoint of crime prevention. <P>SOLUTION: A scaffold bolt 102 comprises: a first screw portion 403 that is provided at one end of a substantially columnar-shaped shaft portion 401 and has a spiral-shaped thread 403a centered around an axial direction of the shaft portion 401; a second screw portion 405 that is provided at the other end of the shaft portion 401 in a longitudinal direction and has a thread 405a having the same pitch as the thread 403a; and a scaffold portion 404 that is provided between the first screw portion 403 and the second screw portion 405 in the longitudinal direction of the shaft portion 401. The scaffold bolt 102 is constituted displaceable between a use position in which the scaffold bolt projects toward the outer periphery direction from a surface of a concrete column 101 by screwing the thread 403a to a groove (thread) 302a and a storage position in which the scaffold bolt enters the inside of the concrete column 101 by screwing the thread 405a to the thread 302a. <P>COPYRIGHT: (C)2012,JPO&INPIT |
