Linear drainage ditches, The construction and improvement of drainage systems in urban planning projects have undergone tremendous changes. With the deepening cooperation and continuous division of labor in social production and the continuous improvement of labor cost in society, linear finished drainage ditches have gradually replaced the traditional cast-in-place drainage ditches, and have been applied more and more widely in urban drainage systems. The finished drainage ditches are made of concrete, and the cover plate materials are divided into four grades: resin, galvanized steel, stainless steel and ductile iron. It can meet the load-bearing requirements of six load-bearing grades of EN1433 standard. It is suitable for construction of urban districts, commercial plazas, landscape green space, traffic roads, parking lots, railway stations, airports and ports.