How to relocate the derrick mast guide device for steel tower assembly and dismantling work and the mast guide device

摘要

PROBLEM TO BE SOLVED: To provide a mast guide device capable of omitting lifting and lowering work in which an operator moves back and forth between a steel tower and a mast at the time of assembling a steel tower. SOLUTION: A mast guide device 7 surrounds a mast 3 so as to be able to move up and down relative to each other, is supported by a steel tower main pillar member P by a horizontal branch line 9, and holds the mast 3 perpendicularly to the steel tower T. It includes an annular frame 14 that surrounds the mast 3 so as to be able to move up and down relative to each other, a guide roller 15 provided on the annular frame 14, and a stopper 16. The guide roller 15 can roll up and down on the outside of the mast main pillar members 3a to 3d. The stopper 16 can freely restrain and release the mast main pillar members 3a to 3d, and is urged to the restrained position by the spring 17. When one end side of the horizontal branch line 9 is connected to the stopper 16 and the other end side is locked to the tower main column member P with a predetermined tension, the stopper 16 is arranged at the release position against the urging force of the spring 17. To do. [Selection diagram] FIG. 7