Recently，Jointly built by China Railway Construction Heavy Industry and China Railway 11th Bureau“Jiajinshan”Open Rock Tunnel Boring Machine（TBM）Successfully completed about 7.5 kilometers of tunneling task，One year ahead of schedule.，It marks a significant progress in the construction of the tunnel.，It has laid a solid foundation for the full penetration of the main tunnel.。

“Jiajinshan”TBMOut of the hole

“The Long March is a dangerous journey.，The most memorable Jiajin Mountain”，Jiajin Mountain is located in Aba Tibetan and Qiang Autonomous Prefecture of Sichuan Province.，It was the first big snow mountain crossed by the Red Army during the Long March.。“Jiajinshan”On April 16, 2022, it was offline in Changsha Second Industrial Park of Railway Construction Heavy Industry.，On June 30 of the same year, it started smoothly at the construction site.，During this period, China's highways were created.TBMA new record of 50 meters of daily excavation footage。

“Jiajinshan”TBMOriginating

It is reported that，The Jiajin Mountain Project is associated with the Giant Panda National Park Reserve、World Natural Heritage Core Area。The construction safety risk in this area is high，The tunnel will pass through the Xiaojin arc structure belt.，Maximum burial depth of 1400 m，Rock burst during the period、Fault fracture zone、A sudden gush of water、Large deformation、Gas and other potential major adverse geological problems。China Railway Construction Heavy Industry Co., Ltd. and China Railway 11th Bureau Co., Ltd.，In the owner、Under the guidance of design institutes and experts in the industry，YesTBMThe cutter head、Main drive、Roofbolter、Advance drilling rig、Emergency spray mixing system、Harmful gas detection device、Slag removal device、Targeted design of emergency drainage and other systems，It provides high efficiency for the smooth penetration of the tunnel.、Safe equipment support。

“Jiajinshan”TBMAssembly site

It is understood that，Jiajinshan Tunnel Project of National Highway 351 belongs to Sichuan Provincial Party Committee and Government“I do practical things for the masses.”A livelihood project、Key projects of the Provincial Communications Department，It is the longest second-class highway tunnel in China.。Opening the Jiajinshan Tunnel Will Change the Winter Closure of National Highway 351“Winter Tube”Limitations，It can pass all the year round.，Greatly reduce travel times，Greatly enhance the ability of road disaster relief support，To promote the development of red tourism resources along the line、It is of great significance to support the revitalization and development of the old revolutionary areas.。

At the same time，“Jiajinshan”It is used for the first time in the construction of national and provincial trunk highways.TBMSuccessful cases of construction，It will also promote the wide application of similar products in secondary highway tunnels.。