March 19，By China Railway Construction Heavy Industries、China Electric Power Construction Co., Ltd., jointly built by Guangzhou Railway Group and the Seventh Bureau of Hydropower, is the first super-large diameter in China.（∅14.33m）Slurry balance shield machine“Pingshan East No.2”It was officially launched in Changsha Second Industrial Park of Railway Construction Heavy Industry.。

“Pingshan East No.2”The total length is about 130 meters.，Excavation diameter 14.33 meters，Total weight 3800 tons。The cutter head of the shield machine is painted with the pattern of mountains, rivers and seven high-speed trains.，It shows the lofty aspirations of the builders who are not afraid of hardships and dangers and the spiritual strength to move forward.。After the equipment leaves the factory, it will help the railway station project from Shenzhen to Shenzhen-Shantou Cooperation Zone.SSSG-Tunneling construction of Danao shield section of Bid 3 project。

It is understood that，Length of Tanao Shield Tunnel 4630.5 meters，It is a single-hole double-track tunnel.，Maximum longitudinal slope 28‰。The tunnel runs parallel to the Xiamen-Shenzhen high-speed railway for a long distance.，And under the Danao River.、Local residential areas and many other buildings and structures。During this period, it passes through argillaceous sandstone.、Limestone、Glutenite、Granite formation，Karst development area of 240m、1200 meters of granite strata and 3 faults，It puts forward higher requirements for equipment performance.。

For the complex geological conditions of the project、Long distance tunneling and other engineering problems，The R & D team of Railway Construction Heavy Industry has carried out a number of targeted designs for the shield machine.，Equipped with heavy composite cutter head、Telescopic main drive、Double crushing system，Fficient material convey system and box culvert fine adjusting device，With box culvert assembly and fine adjustment function，It provides a strong guarantee for the quality control of shield tunnel construction and forming.。

It is reported that，Shenzhen-Shantou Railway is a national railway.《Medium and long term railway network planning》“Eight horizontal and eight vertical”It is an important part of the coastal high-speed corridor in the main high-speed railway corridor.，It is a key project to improve the rail transit construction in Guangdong-Hong Kong-Macao Greater Bay Area.。After the completion of Shenzhen-Shantou Railway，Will be opened“Half an hour in Shenzhen”“Guangzhou 40 minutes”Life circle，For Shenzhen to enhance the core engine function of Dawan District、Improve the external railway corridor、It is of great significance to link up the coastal high-speed railway.。