Drilling rig for constructional engineering investigation and use method

The invention discloses a drilling rig for constructional engineering investigation and a use method, the drilling rig comprises a frame, the inner wall of the frame is provided with an inner groove, the outer wall of the top of the frame is fixedly connected with a tower, the inner side of the tower is provided with two symmetrical rotating seats, a rotating frame is fixedly connected between the inner walls of the two rotating seats, and the rotating frame is fixedly connected with the inner wall of the frame. A hydraulic machine is fixedly connected to the outer wall of the rotating frame, a cylinder machine is fixedly connected to the sliding end of the hydraulic machine, and a sampling head is arranged at the bottom of the cylinder machine. The tower frame is installed on the frame, the tower frame can be conveniently moved through the frame, and the rotating seat arranged in the tower frame can control the rotating frame to rotate, so that the rotating frame can be kept flat or vertical, the effects of