Recently，Super-large diameter inter-city railway tunnel shield machine jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau“Jingtong”It started smoothly in Beijing。“Jingtong”Maximum excavation diameter up to 13.3 meters，The whole machine is about 138 meters long.。

It is understood that，“Jingtong”Applied Yunchaojianhe Tunnel of Beijing-Tangshan Railway Bid 8，It is the first large diameter shield tunnel of high-speed railway connecting Beijing-Tangshan Intercity Railway and Beijing City Vice-Center Hub.。Beijing-Tangshan Intercity Railway starts from the comprehensive transportation hub station of Beijing's urban sub-center.，It ends at the existing Tangshan Station in Tangshan City, Hebei Province，It passes through Tongzhou District, Beijing、Langfang City, Hebei Province、Baodi District, Tianjin、Tangshan City, Hebei Province，The total length of the line is about 148.Seven kilometers，The main line of the Beijing section is about 9 kilometers long.，Designed maximum speed of 350 kilometers per hour。

For the large excavation section of the project、There are many geological risks、High requirements for land subsidence control, etc.，“Jingtong”Configuration of large flow mud circulation control system、Large-load multi-crane coordinate hoisting system、Many intelligent devices and advanced integration technologies, such as box culvert intelligent fine adjustment device and segment forming quality monitoring system, etc.，To provide strong support for the smooth construction of the Beijing-Tangshan Yunchaojianhe Tunnel Project。

It is reported that，After the completion and opening of the Beijing-Tangshan Intercity Railway，It will effectively improve the service level of the inter-city corridor from Tongzhou to Tangshan in Beijing.，It greatly facilitates people's travel along the line.，Promote economic and social development along the line，To dredge Beijing's non-capital functions、Improve the railway network structure in the Beijing-Tianjin-Hebei region、It is of great significance to serve the implementation of Beijing-Tianjin-Hebei coordinated development strategy.。