TR Circular E-C058_9th LRT Conference_2003.pdf - Florida ...

Berliner, Campo, Dickerson, and Mack 395
area, a bus pick-up/drop-off, and an access to the station. A shaft 37 ft (11.3 m) in diameter
provides access to the platform. The shaft contains three elevators, access stairs and the
ventilation ducts.
At the bottom of the shaft, at platform level, is an elevator lobby. The elevator lobby was
sized to accommodate peak level patronage. The elevators were sized to completely transfer the
patronage of one peak period train from the platform level to the surface prior to arrival of the
next peak period train. The elevator cabs have a capacity of 5,000 lb (2,268 kg) with a maximum
load of 33 passengers. The cabs will run at 700 ft (213 m) per minute. The doors will be 4 ft, 6
in. wide, (1.4 m) allowing easy transfer of passengers on and off the elevators. With openings at
both ends of the elevator cab, the cabs will load from one side and exit from the other, for peak
passenger transfer efficiency. The elevator lobby at the platform level will be provided with
closure roll-down “fire-shutter” doors to isolate the lobby area from either platform during an
emergency.
The platform is 280 ft (85 m) long, to accommodate a train of three light rail vehicles.
The width of the platform is 39 ft, 7-1/2 in. (12 m). It is divided longitudinally by a center
firewall to isolate one side of the station in case of an emergency.
Large openings within the center fire wall equipped with horizontal sliding fire resistant
pocket doors connect each trackway platform. In the event of an emergency, the sliding doors
will be closed to isolate one half of the platform from heat and smoke allowing it to serve as a
safe refuge area. Each pocket door is equipped with smaller spring loaded double swing doors to
allow exiting occupants to continue to cross the separation wall after the pocket doors have
closed. The resulting fire separation provides the platform occupants with a safe area to
accommodate egress from the station. From the safe area, the occupants can access elevators and
an exit stair for egress to ground surface, additionally, the occupants can walk out through the
tunnel portals.
Two transition areas, one at each end of the platform, serve to house the tunnel
emergency ventilation fans and their associated power supply. The platform ventilation fans and
the associated power supply and ancillary facilities are located in the basement of the station
facility at the surface.
Platform Level
The platform level consists of the station platform, a vestibule (lobby) area, and two transition
areas at the ends of the station. Two transition areas, one at each end of the platform, house a
total of four tunnel emergency ventilation fans. Two fans are located at each end within a two
level fan plant. At either end of the fan plants are plenum areas. The plenum areas direct air flow
during tunnel emergencies, by the use of by-pass dampers. The by-pass dampers are located in
the plenum walls adjacent to the trackways. Based on the location of an emergency, by-pass
dampers on one trackway would be opened, while the by-pass dampers to the opposite track
would be closed.
Street Level
The station facilities at the street level include a plaza for waiting passengers, streetscape, bus
bays for pick-up and drop-off, the shaft headhouse, the elevator machine room, the stair
pressurization room and the elevator lobby. In addition, six ventilation stacks are provided for