Drilling and coring drill pipe

The invention relates to the technical field of geological exploration, in particular to a drilling and coring drill pipe. A thread groove and a notch groove are formed in the internal wall surface ofthe pipe wall of the lower part of a drill pipe; a cutting ring is in screw-thread fit with the interior of the thread groove; the cutting ring comprises arc thread blocks, arc telescopic pieces anda cutting knives; the cutting knives are fixed on the internal sides of the arc thread blocks; the arc telescopic pieces and the arc thread blocks are alternately arranged; and the two ends of the arctelescopic pieces are correspondingly and fixedly connected with the arc thread blocks on the two sides. According to the drilling and coring drill pipe, additional power is not needed; through cooperation between the thread groove in the lower part and the cutting ring, spinning rising, avariable diameter cutting and rock core fixing of the cutting ring can be realized under the action of reverse rotating of a drilling ma