REAMING DEVICE OF EXCAVATION HAMMER FOR CORE BARREL WORK

摘要

The present invention relates to a bore expanding device for an excavation hammer for a core barrel work of a pile drilling machine. The purpose of the present invention is to provide the bore expanding device for an excavation nhammber for a core barrel work enbling an excavation hammber for a core barrel work to be easily lifted along an inner surface of a casing. That is, the present invention relates to the excavation hammber for a core barrel work of a pile drilling machine configuring a rotor to have a shape and where two or more hammber bits formed in an installation unit and a suction discharge pipe is formed. The installation unit forms a distance between an inner member and an outer member to have a larger dimension than a diameter of the hammer bit, and the variable hammer bit is symmetrically more installed between the inner member and the outer member, and a support pin protrudes from an upper end of the variable hammer bit to be mounted in a mounting groove, and a bracket is formed in the lower end of the variable hammer bit, and a rod of a cylinder is connected to the inside of an installation space to be rotated in the bracket.