Piling, apparatus and methods for pouring a concrete piling in situ around pre-positioned reinforcing rods inside removable hollow pipe sections that have been screwed into the ground. A final coupler pipe section including a removable coupler device is releasably attached to a reducer section and helical screw anchor that are left in the ground. The pipe sections are connected end to end by helical flanges and are screwed into the ground using the helical screw anchor. Once the pipe sections are screwed into the ground to a desired depth, the coupler device is operated to release the coupler section from the reducer section and the coupler device is extracted from the pipe sections. Reinforcing rods are disposed inside the pipe sections and reducer section. Concrete is poured into the pipe sections and reducer section to encase the reinforcing rods. The pipe sections including the coupler section are then removed from the ground and reused.