Abstract: This project is the construction of Jinyang Road Reconstruction and Expansion Project under the 2 ～ 12.5 m frame bridge under the throat area at the west end of Wuxi Station III. Wuxi Station is the largest marshalling station in the northwest region and is responsible for the main cargo marshalling, The shunting and receiving and dispatching tasks are basically in the busy period throughout the year. After 6 months of plan discussion and approval, the Ministry of Railways finally adopted this construction plan. The construction level is set as Class I construction. The specific plan is within 70 hours. The throat lines and turnouts at the west end of Wuxi Ⅲ Field were intermittently blocked, and the throat area was completely blocked for 36 hours. The framed bridge used large excavation and jacking technology to pass through the west throat area of Wuxi Ⅲ Field.