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St. Petersburg
Requirement
tunnelling project
 |
Employment | Person |
|---|---|---|
| Geology | Soft and hard clay | |
| Tunnel Length | 105 m | |
| Diameter | 10,700 mm |
Solution
machine data
| Machine Type | EPB Shield | |
|---|---|---|
| Support Techniques | Segmental Lining | |
| Cutterhead Power | 1,200 kW | |
| Torque | 8,600 kNm |
St. Petersburg is the most northern megacity in the world and its metro system is one of the deepest in the world. The Station Obwodny canal is located on line 5 at a depth of 60 meters. For a long time it was not put into operation, since the access shafts from the surface were not yet built. The major challenge during mechanized tunneling of the 105 meter long escalator shaft was the gradient of 30°.
The solution was a Herrenknecht EPB Shield with a diameter of 10.69 meters which started with a special launch construction – developed and produced by Maschinen- und Stahlbau Dresden. The TBM was kept on its path during tunnelling with an innovative system of lifting cables and hydraulic cylinders in accordance with the parameters of the VMT guidance system. Two rail-bound wagons, drawn by winches, provided for the removal of the soil material. They also transported the lining segments below ground, which were produced in formwork made by Herrenknecht Formwork GmbH. Tunnelling went smoothly with the innovative machine made in Schwanau in the hands of the OAO Metrostroy specialists, achieving performances of up to 4 meters a day. The last lining segments could be installed in time for Christmas 2009 after only 12 weeks of tunnelling.
