Subgrade protective fences are widely used in the prefabrication of cement subgrade fences such as national highways and railways, and because of their relatively standardized size, they can be used in most of the projects currently under construction. The subgrade protective fence plastic mold is mainly divided into 3 parts, the guardrail pillar mold, the upper and lower sill molds and the guardrail sheet mold.

1.8 meters of roadbed protection fences are usually divided into three specifications: 3 meters, 1.59 meters, and 1.15 meters. In the use of hurdles, according to different prefabrication habits and planning designs, two-piece 149.5x140.5x9cm hurdles or four-piece 2A + 2B hurdles can be used for 3m units (A: 149.5x65x9cm; B: 149.5x75x9cm) .

In the actual subgrade fence pouring process, there are generally supporting machinery and equipment to assist the protection of the fence mold and the cement finished product demoulding, such as mechanical shakers, centrifuges, etc. to enhance the characteristics of cement products, molding speed, product density and surface finish