TOPDRESSING DEVICE OF BORING MACHINE USING CRANE

摘要

PURPOSE: A topdressing device of a boring machine using a crane is provided to execute a topdressing work effectively. CONSTITUTION: The topdressing device of a boring machine using a crane comprises: a hydraulic drive unit reciprocated by a leader erected on the ground using a crane; a drive rod(20) transferring hydraulic pressure and air from the hydraulic drive unit to an excavation site; a tool unit(30) provided with bits(33) formed on a holder(31) connected to an end of the drive rod(20); and a case(40) interposed to form a passage to a job site excavated by the tool unit(30). The holder(31) of the tool unit(30) contains an air supply hole(51) to supply air pressure for topdressing, packings(50) to cover up a gap of the case(40) tightly and retake holes(52) to retake topdressing soil to the air supply hole(51).