| 摘要 |
PROBLEM TO BE SOLVED: To provide a grip mechanism which is moved linearly between column-shaped objects without changing the direction thereof with respect to a forward press-in direction of the column-shaped object and without bypassing to the side under a construction environment where it is difficult to remove the grip mechanism from the column-shaped object such as a pile, a column or a bridge pier.SOLUTION: A grip mechanism comprises a pair of fixed frames 11, 12 gripping a column-shaped object disposed while being confronted in parallel with the traveling direction of the grip mechanism, and a pair of opening/closing frames 13, 14 gripping the column-shaped object. The opening/closing frames 13, 14 and the fixed frames 11, 12 are concatenated to be opened/closed by opening/closing means 15, 16 and concatenated to be locked by lock means 17, 18. The grip mechanism is moved in the traveling direction by releasing the lock means 17, 18 and alternately opening the opening/closing frames 13, 14 through the opening/closing means 15, 16. |
