Project: Metro Line "A" Extension
Company: Prague Public Transit Co., Inc.
City: Prague, CZECH REPUBLIC
Timing: 01/2010 - 11/2014
Case study: The extension of Line A of the Prague Subway System constitutes the main transport axis of the north-western sector of Prague. It starts at the present terminus station Dejvická, climbing westward under Evropská Street and turning southward in the area of Veleslavín. It passes through difficult terrain, as a result of which most of the line is an underground structure, with driven stations and line sections between the stations. Other factors determining the vertical and horizontal layout of the line include railway, P+R terminal and bus transfer junctions in Veleslavín and efforts to allow a direct entry from the subway to the Hospital Complex in Motol and vice versa. The maximum gradient and minimum track curve radius, R, are 39.5 ‰ and 630 m, respectively.
Due to the terrain morphology and highly urbanized environment, most of the line’s structures and elements will be driven. Tunnels of both single- and triple-aisle stations will be driven using the NATM (New Austrian Tunneling Method) technology. Single-track tunnels connecting the stations will utilize the TBM (Tunnel Boring Machine) technology and modern tunnel-driving machinery. Annular rings of the tunnel lining will consist of reinforced concrete segments and the space behind the lining will be filled. The maximum subsidence limit will not exceed 5 mm. To a lesser extent, the NATM technology and blasting will be used to drive double-track tunnels and connections between them. Load-bearing elements of excavated parts of the line will be mostly monolithic reinforced concrete frame structures with slab ceilings. Waterproof sheet insulation will protect the structures against soil moisture, groundwater pressure and stray currents. Underground walls, pile walls and strutted sheeting based on micropiles will be used to ensure stability of building pits.
The Line A extension comprises 4 new stations (Červený Vrch, Veleslavín, Petřiny and Motol), its overall length being 6,134 m. The project is jointly financed by the Capital City of Prague, which used a loan from the European Investment Bank to the tune of approximately CZK 6 billion for this purpose, and the European Union, whose contribution is roughly CZK 7 billion. The total project costs are expected to amount to CZK 22.5 billion. The new Dejvická – Motol extension is scheduled to be put into operation in the end of 2014. Municipal public transport systems should primarily be based on high-capacity, environment-friendly, barrier-free rail vehicles which are attractive both for their passengers and for city-dwellers. The Line A extension project in Prague meets the above strategic priority and can thus represent the “best practice” example in the field of infrastructure development, which can be followed by other cities or regions.
Innovation: The project’s objective is to significantly improve municipal transport services in the north-western sector of Prague, including a substantial reduction of surface transport (especially bus traffic) resulting in a commensurate decrease of environmental pollution. The fundamental benefit of the new Line A segment consists in the relocation of the municipal and regional bus transport terminal from busy Vítězné Square, which is relatively close to the Prague Castle, to the Veleslavín Station, where an extensive terminal hub allowing transfers between trains, trams, buses, individual passenger vehicles (P+R parking facility) and subway. In the years to come, the terminal hub will be supplemented by a railway line to Prague’s Václav Havel Airport.The new line segment will significantly improve access to the Hospital Complex in Motol, the largest facility of its kind in Central Europe and the everyday destination of thousands of patients and employees.
PTx2 strategy: From November 2014 onwards, travelling in the north-western sector of Prague will be faster, more environment-friendly and more comfortable. The new Line A segment will divert bus traffic from the vicinity of the Prague Castle, provide a direct connection to health care for patients of the University Hospital in Motol, facilitate trips to and from dormitories in the area of Dejvice and Petřiny for students, permit train passengers to switch to the subway in the Veleslavín Station, and make it easier for air travelers to get to the Václav Havel Airport in Prague.