Railway Construction Heavy Industry "Shenwan No.1" Shield Machine Out of the Tunnel, Helping the Construction of the Longest Intercity Railway Submarine Tunnel Project in China

Recently，Jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau“Deep Bay One”The cutter head of the slurry balance Shield Machine breaks through the soil，It marks the longest inter-city railway submarine tunnel in China.——Guangguan-Shenzhen Intercity Railway Shenzhen Airport to Gushu Work Well Right Line Successfully Completed。

“Deep Bay One”The cutterhead broke through the soil

The shield section of the right line tunnel from Shenzhen Airport to Gushu working shaft is 4365 meters long.，Among them, the sea area of Xiwan is more than 3100 meters.，It is the longest single-head tunneling distance of the whole line.、The only tunnel under the sea，It is also the project with the highest environmental risk on the whole line.。The tunnel underpasses major risk sources such as Shenzhen Baoan Airport and the foundation of Yunfan Bridge.，Dense traversing of cohesive soils、High water sensitive soil、Soft at the top and hard at the bottom、High strength granite and other 9 kinds of variable strata，And that Shield Machine need to excavate in the submarine high pressure stratum for a long distance.，The construction is extremely difficult。

“Deep Bay One”Acceptance site

In order to adapt to the complex geology and surrounding environment of the interval，China Railway Construction Heavy Industry and China Railway 14th Bureau have carried out a series of targeted designs for the Shield Machine.，Uch as an enhanced cutterhead、High precision air pressure balance control system、High-pressure-bearing main drive seal system、Multi-level grouting system、Large flow circulation system、Large particle anti-stagnation drainage, etc.，The geological adaptability of the shield machine is greatly improved.。At the same time，To improve the working environment of the tunnel，The shield machine is also equipped with a tunnel ventilation and refrigeration system.，Make the construction work more humanized。

“Deep Bay One”The cutter head goes down the well

Under the professional construction organization of China Railway 14th Bureau and the technical service of China Railway Construction Heavy Industry Co., Ltd.，The project strictly controls the shield posture and segment selection.，And that quality of the for tunnel is effectively ensured.，It has laid a solid foundation for the successful completion of the Shenzhen Airport to Qianhai Section of the Guangguan-Shenzhen Intercity Railway.。

The section from Shenzhen Airport to Qianhai of Guangguan-Shenzhen Intercity Railway is an important part of Guangzhou-Shenzhen Intercity Railway Network in Dawan District.，After completion and opening to traffic，Intercity bullet trains will go directly to Qianhai and Baoan Center.，To improve the intercity network of Guangdong-Hong Kong-Macao Greater Bay Area，It is of great significance to realize the development of regional economic integration。

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