| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure orientation of a drilling shaft of a drill and to reliably cause the drill to pass through a position where an embedded object is avoided when a through-hole is formed at the position where the embedded object is avoided by the drill. <P>SOLUTION: A drill shaft measurement device 25 for measuring orientation of a drill shaft of a drill of a boring device when a through-hole is formed through a column 1 of a building of an RC frame by the drill of the boring device comprises: irradiation means 26 and 27 for irradiating light spread on a plane including the drill shaft in two directions from one column surface 1a side of the column 1; and reflection means 28 through 31 that reflect the light irradiated from the irradiation means 26 and 27 and project the light on one column surface 1a of the column 1 and to the other column surface 1c side opposite thereto. By obtaining a point of intersection between the light in two directions projected to the other column surface 1c side of the column 1, the orientation of the drill shaft of the drill can be measured. <P>COPYRIGHT: (C)2013,JPO&INPIT |
