The International Information Center for Geotechnical Engineers

Monday, 22 July 2013 11:59

GEO5 and the 5th operating section of Prague metro Line A

Excavation of side station tunnels Excavation of side station tunnels. Credits: Fine Software

Nádraží Veleslavín station description

Nádraží Veleslavín station is the first triple-vaulted mined station with acast-in-situ reinforced concrete lining on the Prague metro route. The excavated area of the left-hand and right-hand tunnels is 70.6m2; The excavated area of the central tunnel is 42.9m2. The maximum station height is 10.25m and the width is 22.34m. The total mined station length is 100m. A mined escape gallery ending in a shaft excavated from the surface is part of the station.

The station construction started by driving the right-hand and left-hand station tunnels. The so-called horizontal excavation sequence consisted of top heading and invert. The 300mm thick primary lining is in C20/25 shotcrete. Two hinges were artificially created in the structure designed to make easier breaking of the lining in the area of the central bay possible. When the excavation of the side tunnels had been completed, EPB shields driving the interstation sections were pulled through them. After removing all auxiliary structures required for the pulling of tunnelling machines through, the waterproofing system consisting of a ray-on membrane and subsequently the secondary lining were installed. Water-retaining concrete C30/37 was used for RC structures, or C45/55 concrete for columns and longitudinal beams.

You can read the full article here.

Source: Fine Software

Read 2314 times Last modified on Tuesday, 23 July 2013 08:04