The other day，China's deepest submarine tunnel shield machine jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau“Shenjiang No.1”，In the construction of the Pearl River Estuary Tunnel of the Shenjiang Railway, the tunnel was successfully excavated to a depth of 100 meters below the sea level.，Set a record for the maximum depth of large-diameter shield tunnel construction in China。

The total length of Zhujiangkou Tunnel is 13.69 kilometers，It is a key control project of Shenjiang Railway.。Hydrology of tunnel engineering、The geology is extremely complex，Underpass multiple main channels，The maximum buried depth is 106 meters.，Sea water pressure 10.6 bar（An area equivalent to the size of a fingernail bears 10.Six kilograms of pressure.），The high water pressure construction area is about 110 meters.，It is the largest buried depth in China at present.、The undersea tunnel with the highest water pressure，It is one of the most difficult underwater tunnels under construction in China.。

According to the characteristics of the project，The R & D team of China Railway Construction Heavy Industry Co., Ltd. and China Railway 14th Bureau have carried out targeted selection and design of shield machine.，Tailor-made “Shenjiang No.1” Ultra-large diameter slurry balance shield machine，Have completely independent intellectual property rights。Shield machine adopts double shield shell design.，Set 4 reinforced shield tail brushes and 1steel plate bundle，The maximum bearing capacity of the shield machine is 12 bar.，The adaptability of the equipment under the ultra-high water pressure of the seabed is greatly improved.。

Shenjiang Railway for China“Eight vertical and eight horizontal”An important part of the coastal corridor of the high-speed rail network，The main line is 116 kilometers long.。After the completion and opening of the Shenjiang Railway，It is conducive to creating a half-hour life circle in the Guangdong-Hong Kong-Macao Greater Bay Area.、Economic Circle，It can directly radiate and drive the coordinated development of eastern Guangdong, western Guangdong and the Pearl River Delta.，Shenzhen's Qianhai Free Trade Zone and Guangzhou's Nansha Free Trade Zone will be interconnected by high-speed rail for half an hour.。