March 20，By China Railway Construction Heavy Industries、China Railway 14th Bureau、Xindi Energy Engineering Technology Co., Ltd. jointly built the first domestic super-large diameter shield tunnel mechanical construction contact channel TBM“Haizhu Bay No.1”Successfully offline in Changsha No.1 Industrial Park of Railway Construction Heavy Industry。  

The connecting passage is connected to the subway.、Railway、A transverse passage between two adjacent tunnels such as a highway.，Have connectivity、Functions such as drainage and fire prevention。Construction of connecting channel is equivalent to“Make a hole in a hole”。“Haizhu Bay No.1”The connecting tunnel boring machine will be used in the connecting tunnel project of Haizhuwan Tunnel in Guangzhou.，Mechanized construction of highway tunnels will be opened“The last mile”，This is also the first application of domestic equipment in the connecting passage of large-diameter highway tunnels.。

It is understood that，The shield section of Guangzhou Haizhuwan Tunnel Project is 2077 meters long.，Through the fracture zone、Pearl River Channel，Through mudstone、Argillaceous siltstone formation。There are 6 connecting passages in the tunnel section.，The main tunnel segment at the connecting passage isC60 high strength segment，The tunnel is buried more than 45 meters deep.，It shall be constructed simultaneously with the main tunnel.，Extremely difficult。

For the above key and difficult points of the project，The R & D team of Railway Construction Heavy Industry has developed and applied the integrated synchronous construction layout of equipment.、High strength cutterhead、Permanent magnet drive、High-precision guide deviation rectification、Many new technologies such as high pressure-bearing sealing and rapid adjustment of equipment position and posture，For the security of the communication channel、Efficient、High quality construction provides strong guarantee。

At present，The TBM has been successfully applied in metro tunnels with a diameter of 6 meters.，It is the first time in China to successfully break reinforced concrete segments by ring cutting.。Coming up，Relying on the Guangzhou Jiebang Project, the TBM developed by China Railway Construction Heavy Industry Co., Ltd. will be demonstrated in the intercity railway tunnel with a diameter of 9 meters.，The formation is small、Medium、Full coverage of large and other application scenarios，Provide intelligent technology and equipment for major national projects。