[Student Question] What are the main construction procedures of a long spiral drill rig?
　　[Answer] Laying the cushion layer, setting out pile positions, positioning the drill rig, selecting materials, mixing materials, drilling, transporting silt away, feeding materials, lifting the drill, forming the pile, moving the drill rig, and testing the pile.
　　From the perspectives of safety and quality, because the four procedures of mixing materials, drilling, feeding materials, and lifting the drill involve the quality of the mixture, the length of the pile body, the solid density of the pile body, and whether pile breakage will occur, they are key procedures; the rest are general procedures.
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