Steel screw pile pulling casing

This work is not particularly complicated, and it is pulled out in two steps. First of all, the steel casing is rotated to the left and right within the gap range of its stop head, that is, between the pipe boot stop head rotation. Pull it up at the same time. When the steel casing is pulled out above the stopper, the rotation amplitude can be increased, but the rotation range should avoid excessive twisting of the steel wire rope of the casing. If the steel casing is hung in a sling, it can be turned in one direction (in the opposite direction of the screw pile), so that the progress of pulling the steel casing may be slightly slow. When turning the steel tube in the opposite direction, only at the beginning; A few meters have a lot of resistance and must be overcome. Then the resistance is reduced, and when it is close to the ground, it is generally not rotated, and the steel casing can be easily pulled out by the power of the crane.