Cast iron drainage pipes are mainly responsible for rainwater and highway drainage tasks. Cast iron drain pipe is an external steel pipe formed by adding other additives to high-density steel. According to different drainage requirements, the size of the pipe hole can be 10mm × 1mm-30mm × 3mm, and can be evenly distributed in the range of 360 degrees, 270 degrees, 180 degrees, 90 degrees, etc. It is widely used in drainage fields such as highways, railway subgrades, subway engineering, waste landfills, tunnels, green belts, sports fields, and slope protection caused by high water content, as well as underground irrigation and drainage systems in agriculture and horticulture. It has become one of the three main products in China's civil engineering construction (seepage and drainage) along with soft permeable pipes and plastic blind ditches.