The breakthrough of the rectangular shield pipe jacking machine with the largest section of the world realized by China railway equipment 

22:23 on November 4th, after 62 days of continuous driving, the world's largest rectangular cross section of shield type pipe jacking machine "by the China railway equipment group independently developed to develop" the successful implementation of the Tianjin Metro Line 11 Neijiang Road Station black cattle city crossing through the entrance.

Tianjin heiniucheng road width of 66.5 meters, two-way ten lane design, Tianjin city is the large traffic and heavy traffic fast city main road. A heiniucheng road tunnel length of 92.6 meters, the structure design of reinforced concrete pipe with elliptical section, structure clearance width of 9 meters, 6.1 meters high, this is Tianjin's first large section rectangular pipe jacking tunnel, Tianjin city is also the first use of large section rectangular pipe jacking machine is under construction, is also the first time in the rich the water in the soft ground to explore the application of pipe jacking construction technology.

"Excavation number" pipe jacking machine excavation section width of 10.42 meters, 7.57 meters high. Railway equipment in the development of "pioneering" type rectangular shield jacking machine, give full play to its own technical advantages of high-end equipment manufacturing, using multi cutter small excavation methods, two layer six cutter layout, section excavation coverage rate reached 95%, the opening of spoke wheel rate can reach more than 70%, the disturbance control the formation of effective, greatly reduce the surface subsidence, ensure the construction safety.