Abstract: The Ranjiaba station of the first phase on No. 6 line of Chongqing railway transit is a 5 floor underground station excavated by cut and cover method, with 41 m excavation depth, 227.4 m length of main body and 29.46 m width. The design of the station is complex and the construction risk and the quality requirement are high. The construction schedule and technical treatments to guarantee the structure and appearance of the station structure are presented by means of study on the main construction characteristics and construction factors of the station, with the large formwork construction of Ranjiaba station structure of the first phase on No. 6 line of Chongqing railway transit as an example.

Key words: deep foundation pit, Metro station, large formwork, concrete, appearance quality