GROUND WATER LEAKAGE A NATURAL ACCOMPANYING PHENOMENON

A few centimeters of surface subsidence and ground water leakage are natural accompanying phenomena of every civil engineering works. These hardly have visible signs inside the station, they calmed down as works speeded up, but they are continuous associated phenomena.
A stretch of as much as 7.6 km has been completed of the tunnels. The south TBM may break into the Szent Gellért station in the first half of March, while the north one has already arrived in January. However, TBMs can be drawn into the station after the internal wall building works are finished, for it is the responsibility of the general design and build company completing the station to ensure maximum safety in the environment affected by works.

For the conservation of surface buildings and to cut off ground water leaking into the station – i.e. to mitigate further effects – last October DBR through the Engineer instructed BAMCO Kkt. builder of the Szent Gellért Square station to finish building of internal walls of the station and linking platform tunnels as soon as possible, yet before TBMs are pulled through. So here, the last inside shell of a three layer wall is still being built, and consequently in the meantime the surface movements and ground water leakage calmed down, settled.

Building of the internal walls will likely be finished at the end of March - beginning of April, the Contractor may push the TBMs into the station subsequently. Following a few weeks maintenance period usual at these times can the tunneling works under the river Danube start, which is foreseen to last for 4 to 6 weeks.

DBR Metro Project Directorate