Project: Eastern Section of Moscow Third Interchange Circuit
Location: Moscow, Russia
Machine data: Its diameter is 10.88 m, and total weight is 1700 t.
Contractor: China Railway Construction International, CRCC 16 Bureau Group
The project, located at the riverside of the Moscow River, passes under heavy traffic and crowded buildings. It includes two sections of a total length of 2947m. One is from Maple Avenue Station to No.2 Working Shaft; the other is from Maple Avenue Station to Nagaginsky Station.
Construction key points
The EPB TBM required excavation in an extremely cold environment of -35oC and faced many difficulties like small curve turning of 400 m, 40% large gradient, and long-distance excavation in shallow overburden. In addition, the machine bored 600 m under the Moscow River; the minimum overburden being 12 m.
Innovations in the TBM
- The EPB TBM is designed to have a heavy-duty composite cutterhead and a high-power drive system, which enables the machine to tunnel safely and reliably in the complex geologies for a long distance.
- For avoiding formation of mud cakes during drive, a big muck inlet is placed at the center of the cutterhead, and several flushing pipelines of conditioning agents are equipped, which helps to improve the plastic fluidity of the muck.
- For avoiding occurrence of ground settlement and grout leaking, the TBM is equipped with an all-around grouting system.
- For solving the problem of mega-sized TBMs to tunnel along small curved turnings, the EPB TBM is designed to have an articulation system, copy cutter bits and a thrust system with floating support.
- In response to the extremely cold climate, the EPB TBM has a low temperature resistance design which enables normal excavation in the environment of -35°C.
True to its name ‘Victory’, named by Marat Khusnullin, former Deputy Moscow Mayor, the EPB TBM achieved a national record of 433.8 m in one month in Russia.