April 26，One cutter head is painted with“Dragon carp”The patterned tunnel boring machine rolled off the production line in Changsha Second Industrial Park of China Railway Construction Heavy Industry.，It marks the successful development of the world's first large-diameter double-shield earth pressure combined roadheader.。This equipment solves the problem that the previous double-shield tunneling machine only has open tunneling.、Tunneling problem only applicable to single stable geological condition，Realize effective combination of double shield and earth pressure tunneling mode，It fills the global design gap of large diameter tunnel boring machine under the interaction of soft soil and extremely hard rock.。

Offline ceremony site

This equipment is 8 in diameter..9 meters，The total length is 131 meters，The total weight is about 1500 tons，Name“Tiebing Guanghua No.6”，By China Railway Construction Heavy Industries、Jointly built by China Railway 15th Bureau Group，It will participate in the construction of the section from Jingxi Road Station to Baiyun Dongping Station of Guangzhou East to Huadu Tiangui Intercity Project.。

Liu Jing, deputy general manager of Guangzhou Metro Group Co., Ltd., announced that the equipment was offline.

Speech by Jin Hui, Deputy General Manager of Guangzhou Metro Group Construction Management Co., Ltd.

Speech by Liu Jianmei, Vice President of Guangzhou Metro Design and Research Institute Co., Ltd.

Speech by Wang Chunsheng, Chairman of Guangzhou Guanghua Intercity Project Company

Party Secretary of China Railway 15th Bureau Group Co., Ltd.、Chairman Huang Changfu delivered a speech

Speech by Sha Mingyuan, Chief Expert of China Railway Construction South China Construction Co., Ltd.

Secretary of the Party Committee of China Railway Construction Heavy Industry、Chairman Liu Feixiang delivered a speech

Deputy Secretary of the Party Committee of Railway Construction Heavy Industry、Director、General Manager Zhao Hui presided over the ceremony.

It is understood that，According to different geological construction conditions，Tunnel boring machine is mainly divided into earth pressure balance shield machine.、Slurry balance shield machine、Rock tunnel boring machine and so on.，The rock tunnel boring machine has a single shield.、Double shields、Open multiple types，It is the first time in the world to manufacture a combined roadheader with earth pressure and double shields of more than 8 meters.。“Tiebing Guanghua No.6”Under construction，Propulsion and segment assembly operations can be performed in dual shield mode，Improve construction efficiency；At the same time, the sealing and pressure bearing of the main structure of the double-shield roadheader are innovatively realized.，To ensure the construction safety of earth pressure mode in weak and water-rich strata。

The world's first large-diameter double-shield earth pressure combined roadheader

This project is the first work area to adopt vertical mechanical shaft in the field of urban rail in China.，The geological length of hard rock to be crossed is as high as 96%，The maximum buried depth of the tunnel is over 210 meters.，Rock strength up to 200 MPa。The length of the starting well of the project is only 33.2 meters，The equipment needs to overcome a number of hard rock tunneling technical problems in the tunneling process.，Passing through multiple fracture zones、Upper soft and lower hard composite formation and boulder formation，The construction is difficult，High technical content，Brings a test to the construction of the interval roadheader。

Guests pose for a group photo in front of the equipment

In development，The research and development team has conquered the high pressure sealing technology of the double shield body.、Modular Design and Rapid Mode Conversion Technology、High Precision Deviation Correction Control Technology、A series of key technologies such as advanced geological prediction，The tunneling efficiency of the equipment in the construction process is greatly enhanced.，At the same time, it provides a reliable guarantee for the subsequent construction of the equipment and the smooth completion of the project.。

In recent years，With the rapid development of rail transit in Guangdong-Hong Kong-Macao Greater Bay Area，Tunnel boring machine (TBM) has a broad application prospect.。Successful Development of Large Diameter Earth Pressure Combined Roadheader with Double Shield，It has effectively solved the problem that the application of single mode shield machine in South China is difficult to meet the long-distance hard rock.、Difficult construction problems of extremely hard rock and complex geological tunnel with soft and hard alternation，Accelerate the application of dual-mode roadheader in key projects.，Promoting high-quality development of rail transit in Guangdong-Hong Kong-Macao Greater Bay Area。