May 16，China Railway Construction Heavy Industry Co., Ltd. and China Railway 11th Bureau、Made by China Railway 14th Bureau“Dinghai”“Yongzhou”The super-large diameter slurry balance shield machine is used in the new Ningbo-Zhoushan Railway.（Hereinafter referred to as Yongzhou Railway）Jintang Submarine Tunnel starts from Ningbo side and Zhoushan side in both directions.，The cutter heads of the two ultra-large diameter shield machines rotate simultaneously，It marks that the world's longest submarine high-speed railway tunnel has entered the stage of shield excavation.。

Departure site

It is reported that，“Dinghai”“Yongzhou”The shield machine is about 135 meters long.，Maximum excavation diameter up to 14.57 meters，The cutter heads are respectively coated with“Shenlong”“Ruilong”Pattern，Have“Shenlong Zhenhai，Good luck”A beautiful moral。Jintang Submarine Tunnel is the key control project of Yongzhou Railway.，From Yinzhou District of Ningbo City in the west，East to Jintang Town, Zhoushan City，Total length 16.18 kilometers，Wherein the length of the shield section is 11.2 kilometers，Maximum buried depth: 78m，The tunnel passes through the 100,000-ton Jintang main channel.，Two shield machines are used from Ningbo、Driving in opposite directions from Zhoushan，Finally, the docking is realized on the seabed.，The required accuracy is not more than 20 mm.，For the first time in the world, the super-large diameter shield machine was docked and dismantled on the seabed.。

Railway Construction Heavy Industry Co., Ltd. combines the engineering characteristics of the project、Key and difficult points and rich construction and technical experience of China Railway Construction Corporation in the past，Adopt a series of targeted design and a number of advanced technologies，It can effectively deal with various complex geological and working conditions.，Provide strong support for the smooth construction of Jintang Subsea Tunnel。

Jintang Submarine Tunnel Project of Yongzhou Railway is one of the ten landmark projects in the construction of major corridors in Zhejiang Province.，After the completion of the project，It will fill the blank of the last district and city in Zhejiang Province without access to railways.，To realize the integration of Ningbo and Zhoushan，Speed up the integration of the two places“The Belt and Road”And the Yangtze River Economic Belt，It is of great significance to promote the integration of the Yangtze River Delta.。

Cutter head coating“Shenlong”Yes“Dinghai”

Cutter head coating“Ruilong”Yes“Yongzhou”