SWITCHING DEVICE FOR GROUND IMPROVEMENT LIQUID SUPPLY PASSAGE IN EXCAVATOR

摘要

PROBLEM TO BE SOLVED: To provide a switching device for liquid supply passage for alternatively injecting ground improvement liquid from two places of an excavating rod.;SOLUTION: This liquid supply passage switching device is composed of an upper shaft body 13 integrally rotatably connected to a driving shaft 3 of a rotational driving device 1, and internally arranging a switching passage 10 connected to a single ground improvement liquid passage 9 penetrating through the driving shaft, and a lower shaft body 14 integrally rotatably connected to the excavating rod 5, and internally arranging two connecting passages 15 and 16 respectively connected to two liquid supply passages 11 and 12 in the excavating rod 5. The upper shaft body 13 and the lower shaft body 14 are connected so as to be relatively rotatable by a specific angle around the axis O, and at normal rotation time of the driving shaft 3, the switching passage 10 of the upper shaft body 13 is connected to one connecting passage 15 in the lower shaft body 14, and at reverse rotation time of the driving shaft 3, the switching passage 10 is connected to the other connecting passage 16.;COPYRIGHT: (C)2002,JPO