There are concrete fall fall Tuo Tuo Tuo and iron fall. Tuo bulky concrete fall, having high water absorption iron mold wholesale mound fall, fall Tuo weight change will change the tension catenary wire high-speed rail market fall mound mold, concrete fall Tuo poor durability. Tuo iron fall in the manufacturing process of casting and galvanizing process, pollute the environment. Iron fall Tuo reprocessing easier, frequent theft phenomenon even affect catenary supply security and train traffic safety. Fall Tuo technical requirements for editing 1, falling Tuo technical requirements should be consistent with the provisions of TB / T2073 2, the manufacturing process a, falling concrete pouring process template Tuo metal fabrication b, iron should fall Tuo sand casting process. 3, performance requirements a, falling Tuo weight of each error should not be greater than 3%. b, fall Tuo surface should be smooth, smooth, without pores, slag eye, caking. c, falling Tuo surface flatness of not more than 1mm.