First, calculate the circumference of the pipeline and how many boards are needed, and then put the sample underground, half a pole 2m, or find a thin piece of iron to draw a circle on it and cut it out with scissors as a template. Note that the head of the board needs to be slightly bent first, and then the two heads are butted when placing the board. Because the pipe has a large straight rod, it needs the cooperation of gantry crane when winding the plate. Lift the board, slowly put the gantry crane on it, circle it to a certain extent, and then put the template in.