To solve the problem that a pile hole is obliquely formed because it cannot be checked in real time whether the pile hole drilled during a pile-hole drilling operation is correctly drilled in a vertical direction or inclined with respect to the vertical direction, on ground that a means suitable for the grasp of the inclined condition of the pile hole is not installed in a pile hole drilling unit for drilling the pile hole into the ground.
An acceleration sensor is provided in a supporting member for supporting a drilling bucket, so as to detect an acceleration generated when a member for supporting the drilling bucket is inclined, and an angle of inclination of a kelly-bar is computed from a value of the acceleration by an inclination angle detecting means. Since the angle of the inclination of the kelly-bar is detected in real time, the occurrence of the inclination of the drilled hole can be immediately grasped.
| JP2608241 | EXCAVATOR |
| JP2000352293 | ADAPTER FOR FOUNDATION WORK MACHINE |
SUGIMURA YASUHIRO
YAGI AKIRA
YAMAGUCHI SEIYA
WATANABE YOSHIJIROU
| JPH07113390A | 1995-05-02 | |||
| JPH10238271A | 1998-09-08 | |||
| JPH0728237Y2 | 1995-06-28 |
Next Patent: N-VALUE DETECTION METHOD, N-VALUE DETECTOR, AND PILE HOLE DRILLING UNIT