In the pile pressing in soil improvement machine the expansion and contraction type leader and are used for this the hydraulic motor running gear and the belt Drive device

摘要

PURPOSE: To make it possible to expand freely a leader of a pile force-fit soil improvement machine. ;CONSTITUTION: In a leader consisting of a plurality of holding cylindrical bodies with different diameters, holding cylindrical bodies 8b with a small diameter are subsequently inserted in holding cylindrical bodies 8a with a large diameter, at the same time, a longitudinally long opening 9 is provided over the overall length on one side of each of the holding cylindrical bodies 8a and 8b, and opening cut pieces 10a and 10b positioned on both sides of the longitudinally long opening 9 are respectively bent at right angles to the inside to form first bent pieces 11a and 11b. Then, the first bent pieces 11a and 11b are respectively bent at right angles to the outside to form second bent pieces 12a and 12b, the front end faces 13a and 13b of the second bent pieces 12a and 12b are so formed that they are flush over the overall length, and they are used as a traveling face of large rollers 39 fulfilling main traveling function of traveling devices 33. The outside of the holding cylindrical body 8b with a small diameter is slidingly contacted with the inside of the holding cylindrical body 8a with a large diameter to expand, and the overall length of a leader 7 can be freely expanded.;COPYRIGHT: (C)1996,JPO