Abstract: A cutting apparatus for use in a sampler is disclosed. The cutting apparatus includes an extension tube having a round unit on a bottom side of the extension tube; a cutting ring located in a bottom portion of a protecting tube; a guide tube which is internally equipped within the cutting ring; a plurality of cutters equipped to an outside of the cutting ring for closing a bottom portion of the sampling tube when the cutting ring is pulled by uplifting an up-lifting rod of the sampler, wherein a plurality of the cutters are uplifted followed by the guide tube and bended according the round unit in order to be gathered and closed; and a connection means for fixing a plurality of the cutters on the cutting ring. A sampler having the cutting apparatus can gather a sample of un-cohesive soil such as a sandy soil without spilling.

Abstract: A large diameter sampler for gathering an undisturbed sample includes an outer tube provided with a bit on a bottom portion thereof for excavating a ground, wherein the outer tube is rotated by applying an outer power for penetrating into the ground; unit for protecting a sample from a disturbance generated by a rotating excavation of the bit, wherein the protecting unit is located the bottom portion of the outer tube, internally, and is penetrated into the ground by weight; a sampling tube for locating the sample pulled-out by self-gravity of the protecting unit; a cutting unit for sheltering a bottom portion of the sampling tube for protecting spilling of the gathered sample, wherein the cutting unit is equipped within the protecting unit and cutting the sample pulled-out by the sample protecting unit; unit for up-lifting the sampling tube and the protecting unit by applying an up-lift force from an operating device which is located on the ground; and an outer rod for connecting the outer tube and a boring