| 摘要 |
<p>An apparatus for automatically removing concrete from a screw-threaded bolt (17) of a screw-jack type support device (A) includes a rotatable tube (15) for receiving the screw-threaded bolt (17), a socket (16) formed on one end of the tube (15) for receiving the nut (19) of the jack device (A), and an arm (6) disposed in axial alignment with the tube (15) and movable toward and away from the tube (15) by a carriage (5) movable along a rail (3) by a piston and cylinder device (7). In use, the screw bolt (17) is inserted in the tube (15), and the nut (19) is fitted in the socket (16), and a base plate (18) of the jack device (A) is abutted agains the arm (6) so that when the tube (15) is rotated by a motor (23), the nut (19) is forcedly rotated and this forced rotation causes the concrete on the screw bolt (17) to be cracked and removed due to friction with the nut (19) as the screw-threaded bolt (17) is moved toward and away from the tube (15).</p> |
