Xinhua News Agency, Beijing, June 22, Xinhua reporter learned from China Railway Construction Corporation Limited.，22nd，With a diameter of 12.72 meters“Xing'an”The cutter head of the shield machine breaks through the wall，Jinxing Railway（Tianjin to Beijing Daxing International Airport.）Key and difficult control projects——Smooth completion of Yu'an No.3 Tunnel，It marks the completion of the main body of the Jinxing Railway.。

According to Shen Huitao, head of Jinxing Railway Project of China Railway 12th Bureau Group,，Length of Jinxing Railway 100.79 kilometers。Among，The existing Tianjin-Baoding Railway is used from Tianjin West Railway Station to Shengfang Railway Station.，The existing Jingxiong Intercity Railway is used from Gu'an East Station to Daxing Airport Station.。Tianjin West Railway Station is located on the whole line.、Shengfang Station、Daxing International Airport Station and other 6 stations，The design speed of the new line is 250 kilometers per hour.。

June 22，Workers from the 12th Bureau of China Railway are working at a construction site in Daxing District, Beijing.。

The total length of Yu'an No.3 Tunnel is 2513 meters.，The shield section is 2080 meters long.，It is the only shield tunnel on the whole line of Jinxing Railway.。It is constructed by earth pressure balance shield machine.，The run-through error shall be controlled within 1 cm。

As an important project for the coordinated development of Beijing, Tianjin and Hebei，After the opening of Jinxing Railway，It will further optimize and improve the layout of the Beijing-Tianjin-Hebei railway network.，Build for“Beijing-Tianjin-Hebei on the track”Open up a new fast track。