Final Report - Asian Development Bank

Asian Development Bank TA7343 Ho Chi Minh City MRT Line 2 Project
MVA Asia Ltd Final Report – November 2010
Station Typical Layouts – Underground
5.3.9 Whilst it is to be expected that station designs will be refined during subsequent design
stages, layouts for sizing and costing purposes at this stage are based on international best
practice for this type of Metro project.
5.3.10 For underground stations, two typical layout models have been considered as shown in
Figures 5.2 and 5.3. At this stage station layouts are based on layout option 1, which
features a central concourse area feeding stairs and escalators which are spaced regularly
along the length of the central island platform. From the concourse area stairs and
escalators are provided, via passageways if/as needed, to access ground level and the
surrounding catchments above. Technical and plant rooms are provided at either end of the
station at both platform and concourse levels as shown.
5.3.11 Layout option 2 aims to spread the surface access points at either end of the station, and
features two separate concourse areas which then connect via stairs and escalators to either
end of the platform. This has the advantage to extend the accesses into surrounding
catchment areas (though this can also be achieved with option 1 by adding longer pedestrian
walkway connections), but has the operational disadvantage of inefficiencies in having two
separate concourse areas (each with ticketing, staffing, etc) and possible confusion for
passengers exiting from trains.
5.3.12 Underground stations will normally have at least four access points (stairs / escalators) to
ground level, but the locations of these will be tailored to suit surrounding land uses and
developments at each station. In addition, underground stations will require 2 ventilation
shafts (normally at either end of the station) to serve tunnel ventilation, plus 1-2 cooling /
ventilation shafts for the platforms and concourse. Stairs and escalators are generally
provided within existing or planned right of way, on footpath areas but ensuring sufficient
width of footpath also remains for passing pedestrians. The ventilation and cooling shafts are
significant structures and are located outside the right of way. These shafts also require 5m
clearance from nearby buildings at ground level, and are thus major considerations for the
station design and footprint.
Figure 5.2: Typical Layout of an Underground Station (1)
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