SOIL IMPROVEMENT DEVICE, AND SOIL IMPROVEMENT METHOD, EARTHQUAKE RESISTANT CONSTRUCTION METHOD AND CONSTRUCTION FOUNDATION PRACTICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To reduce cost by eliminating waste of a soil improvement part and also to realize a simple and compact structure.;SOLUTION: The device comprises: main drilling revolving shafts 2 with three axes which are set in parallel to each other; main drilling cutters 20 which are fixed to the lower end of the main drilling revolving shafts 2 and rotate horizontally; sub drilling revolving shafts 3 arranged in parallel to the main drilling revolving shafts 2; drive wings 30 which are fixed to the lower ends 3a of the sub drilling revolving shafts 3 and rotate horizontally; first connecting-shafts 4A which support each main drilling revolving shaft 2 rotatably while connecting the respective main drilling revolving shafts 2 horizontally; transfer revolving shafts 31 inserted and supported rotatably around the connecting-shafts 4A while rotating around the horizontal axes which intersect perpendicularly to the axial direction C1 of the connecting-shafts 4A; sub drilling cutters 32 which are fixed to both ends of the transfer revolving shafts 31 and rotate around the transfer revolving shafts 31; and sub wings 33 extending towards the diameter directions outside from the transfer revolving shafts 31.;COPYRIGHT: (C)2012,JPO&INPIT