|The Construction Method
Cut and Cover Method
Widely used for the construction of underground stations, at junctions between tracks where larger spans are required or areas which are geological unsuitable for the Bored Tunnel Method. Temporary decks will be installed at ground level as soon as the tunnels or station are excavated to enable the traffic to be restored. All levels of the underground structure will then be constructed under the temporary decks to minimize the impact on the environment and traffic.
Bored Tunnel Method
Tunnel Boring Machines (TBM) drive the tunnels from shafts or stations at depths of between six and twenty-four meters below ground level. Linings are installed immediately behind the face of the TBM as the excavation proceeds until the TBM reaches the end of the drive. Both ends of the bored tunnels usually connect stations or Cut and Cover Tunnels. All of the construction activities, with the exception of the construction of the shafts, are carried out below the ground and minimize damage to the roads. This minimizes the impact on the environment and the traffic.
Special elevators for the handicapped and high capacity escalators will be provided.
An automatic fare collection system, including Automatic Ticket Issuing Machines, Automatic Gates and Special Gates for the handicapped will be provided.
Public address, CCTV, visual information facilities and emergency telephones will be provided.
Stations are provided with an Uninterrupted Power System. In case of a power failure, the entire emergency lights, escalators, elevators, fire hydrants, sewage pump, and the tunnel ventilation system will maintain operation. Low smoke, fire resistance, and non-toxic smoke cables will be used for stations' power supply and distribution to minimize the risk to passengers during a fire.