December 12，With the largest diameter earth pressure balance shield machine jointly built by China Railway Construction Heavy Industry and China Railway 14th Bureau“Splendid”Break through the ground，Marking success（All）From（Gong）Successful completion of Jinxiu Tunnel, a key control project of high-speed railway，The tunnel is the first tunnel project with the largest diameter earth pressure balance shield machine in China.。

“Splendid”Out of the cave

It is understood that，“Splendid”The total length is 135 meters，Total weight 3000 tons，The installed power is 7500 kW。The cutter head painting of this shield machine has Sichuan characteristics.，A giant panda with tender bamboo in its arms.CBit，Cute and cute、Lifelike，It is called by netizens“The Most Cute Heavy Weapon of a Big Country”，It is the largest diameter earth pressure balance shield machine with completely independent intellectual property rights developed in China so far.。

Jinxiu Tunnel is located in Jinjiang District, Chengdu City.，The tunnel starts from the beginning（Chengdu East Railway Station）One kilometer to the south begins to pass through，Go up to the ground outside the South Third Ring Road，The total length is 3655 meters、Among them, the tunnel is 2620 meters long.。Geological soil covering along the tunnel is shallow.，Only 8 to 60 meters from the ground，And the project passes through the prosperous areas such as the southeast central ring of Chengdu.，There are many high-rise buildings on the ground.、The municipal track is densely covered、Pipelines are intricate，The construction is difficult、Extremely high security risk。

  

China Railway Construction Heavy Industry Co., Ltd. celebrated the successful completion of the tunnel

In order to cope with the above complex geology and surrounding environment,，The R & D team of China Railway Construction Heavy Industry Co., Ltd.“Splendid”Targeted design is carried out.，A series of construction problems have been solved.。Uch as by optimizing the tool design，In strongly weathered mudstone、Only 2 cutters were replaced for a total of 1937 meters of excavation in weakly weathered mudstone and other composite strata.，“Zero risk”Underpass the existing Chengdu East Ring Right Line and Chengdu-Guiyang Railway Group（The existing railways are all ballasted track）。

  

“Splendid”Successfully offline in the Second Industrial Park of Railway Construction Heavy Industry

“Splendid”Helping the Jinxiu Tunnel of Chengzi high-speed railway to Run Through Smoothly，It further verifies the reliability of the brand of Railway Construction Heavy Industry.，It promotes the rapid development of the roadheader plate in the field of construction machinery.，At the same time, it also provides valuable reference value for the design and construction of the super-large diameter earth pressure balance shield machine in the Chengdu-Chongqing middle line.。