FALLING PREVENTIVE METHOD OF WORKING FACE NATURAL GROUND

摘要

PROBLEM TO BE SOLVED: To lighten a drill jumbo, to simplify its operation, to hold a working surface even when it is a remarkably irregular working face by uniform pressure and to further improve safety of working of a lower part. ;SOLUTION: A drill jumbo 1 is supported on an upper part of a car body 2 free to vertically oscillate, and it is furnished with a man cage 5 horizontally arranged on a head end of a telescopic boom 4. A natural ground presser body 8 consisting of a flexible bag body is arranged on the front part side of a handrail 6 of the man cage 5. This natural ground presser body 8 in a contracted state is expanded to the front part side and vertically by adding fluid pressure such as hydraulic pressure, etc., it is adhered on it along irregularities of a working surface 11, the working surface 11 is installed with pressure with no clearance by pressing force in accordance with fluid pressure, and accordingly, safety security of the working surface 11 is carried out.;COPYRIGHT: (C)1998,JPO