Recently，With the joint efforts of China Railway Construction Heavy Industry and China Railway 14th Bureau, a 14-meter super-large diameter shield machine with independent intellectual property rights has been built.“New crossing number”The cutterhead broke through a hole under the water.，Shanghai's first regional railway“Airport Link”ⅡSmooth completion of the shield tunnel。

“New crossing number”Shield machine

It is reported that，Shanghai Airport Liaison LineⅡThe bid section is the key control project of the whole line.，Total length of shield tunnel: 4939.8 meters，Single-hole and double-track design is adopted。Different from other bid sections，ⅡThe bid section is the first long-distance section in China.、Large Diameter Shield Tunnels for High-speed Railway Lines in Parallel Operation with Small Spacing。The minimum distance between the tunnel and the Shanghai-Hangzhou high-speed railway is only 8.1 meter，During the construction, it is necessary to cross the municipal highway many times.、Rail Transit、Highway bridges and other important structures（Build）Building。

According to engineering characteristics and project requirements，“New crossing number”Equipped with normal-pressure soft soil cutter head、High pressure bearing main drive seal、Many key technologies such as efficient material transportation and intelligent synchronous assembly of prefabricated components，Greatly improve the adaptability and reliability of the shield machine。At the same time，Relying on the escort of intelligent monitoring system，The average daily footage of shield tunneling reaches 10.4 meters，The highest monthly footage is 576 meters.，Excavation breaks through 400 meters for six consecutive months。

December 2021，“New crossing number”Smooth start of shield machine

It is the first time in China that the fully prefabricated structure system is used in the Shanghai Airport Liaison Line.，It has pioneered similar construction technology.。Large volume of facing prefabricated components、Large size of single member、High requirement for precision of installation nodes、Difficult assembly and other requirements，China Railway Construction Heavy Industry Co., Ltd. and China Railway 14th Bureau Co., Ltd. jointly develop and tackle key problems，It is the first time in China to develop and successfully apply the box culvert fine adjustment system and the middle partition wall assembly equipment.，It realizes the intelligent one-key assembly from automatic grasping to precision control of the whole precast box culvert and the middle partition wall under the rail.。The maximum monthly assembly of the middle partition wall reaches 1200 meters.，Set a record for the fastest assembly of the whole line.。

Box culvert fine adjustment system and mid-wall assembly equipment in operation

From Tunnel Construction to Fine Adjustment of Box Culvert，And then to the assembly of the partition wall.，Railway Construction Heavy Industry should meet the actual needs of the project.，Customized R & D, design and manufacturing，Provide a full range of tunnelling and ancillary equipment。During construction of the project，Research and development of China Railway Construction Heavy Industry、The service team always sticks to their posts.、Overcome difficulties，Starting from the actual needs of customers，For equipment safety、Efficient operation escort。