CLIMBING TOWER CRANE WITH EXPANDABLE RECEIVING BEAM AND CLIMBING THEREOF

PURPOSE:To obtain an expandable receiving beam by sliding or rotating an expansion beam member so as to lengthen or shorten the length of the receiving beam than the interval between steel frame lateral beams by the action of hydraulic cylinders. CONSTITUTION:For climbing, a nut 42 is removed, an ornamental hairpin metal 14 and a receiving metal 13 are removed from a bolt 41 to cut off the connection between steel frame lateral beams 03 and extension members 5 and 8. Hydraulic cylinders 7 and 9 are operated, the left extension beam member 5 is rotated and located in the shortened state, the horizontal beam member 8a of the right extension member 8 is retracted into a right beam member 3, the right extension beam member 8 is located in the shortened state, thus a receiving beam 1 is shortened shorter than the interval between the steel frame lateral beams 03 and 03. The receiving beam 1 is climbed upward in this state, the hydraulic cylinders 7 and 9 are operated, on the contrary to the above, the left extension beam member 5 and the right extension beam member 8 are set in the extended state respectively, respective support sections 5d and 8d are fixed to the lateral beams 03 and 03 with the bolt 41 and the nut 42 via unloaded holes 14a and 13b of the ornamental hairpin metal 14 and the receiving metal 13.