QCVN 08:2018/BXD
NATIONAL
TECHNICAL REGULATION
ON URBAN UNDERGROUND RAILWAY STRUCTURES
TABLE OF CONTENTS
1. GENERAL PROVISIONS
1.1 Scope
1.2 Regulated entities
1.3 Reference documents
1.4 Definitions
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2.1 General provisions
2.2 Ventilation of underground railway structures
2.3 Water supply and drainage of underground
railway structures
2.4 Electricity supply and lighting for underground
railway structures
2.5 Fire safety in underground railway structures
2.6 Emergency exit
2.7 Information and communication in underground
railway structures
2.8 Environmental protection in construction and
operation of underground railway structures
3. REGULATIONS ON MANAGEMENT
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Foreword
The QCVN 08:2018/BXD is compiled by the Institute
of Building Science and Technology, submitted by the Department of Science
Technology and Environment, inspected by the Ministry of Science and
Technology, and promulgated by Ministry of Construction under Circular No. 11/2018/TT-BXD
dated December 26, 2018 of the Minister of Construction.
This Regulation supersedes QCVN 08:2009/BXD Urban
Underground Railway Structures - Part 1. The Underground attached to Circular
No. 28/2009/TT-BXD dated August 14, 2009 of the Minister of Construction.
NATIONALTECHNICAL
REGULATION
ON URBAN
UNDERGROUND RAILWAY STRUCTURES
1. GENERAL PROVISIONS
1.1 Scope
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This Regulation does not prescribe technical
requirements pertaining to planning for underground railway, arrangement of
operation, and technical equipment, instruments of underground railway.
1.2 Regulated entities
This Regulation applies to organizations and
individuals related to construction, renovation, management, and use of
underground railway structures.
1.3 Reference documents
The following reference documents are necessary for
the application of this Regulation. If reference documents are amended or
replaced, the new versions shall prevail.
QCVN 01:2008/BCT, National Technical Regulation on
Electric Safety
QCVN 02:2009/BXD, National Technical Regulation on
Physical Natural and Climatic Data for Construction
QCVN 05:2013/BTNMT, National Technical Regulation
on Ambient Air Quality
QCVN 06:2009/BTNMT, National Technical Regulation
on Hazardous Substances In Ambient Air
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QCVN QTĐ 8:2010/BCT, National Technical Regulation
on Electrical Engineering. Volume 8: Low-voltage Electricity.
QCVN 10:2014/BXD, National Technical Regulation on
Construction for Accessibility for Persons With Disabilities.
QCVN 26:2010/BTNMT, National Technical
Regulation on Noise
QCVN 27:2010/BTNMT, National Technical
Regulation on Vibration
1.4 Definitions
In the Regulation, the terms below are construed as
follows:
1.4.1
Underground railway structures
Refers to a type of urban railway that is built
underground.
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Underground railway station
Refers to a passenger transport station where
trains stop to pick up, drop off passengers, allow professional operations, and
other services to be performed at underground railway structures.
1.4.3
Ventilation channel
Refers to a space consisting of tunnels,
compartments, corridors, and shafts that are clear length-wise and used in
tunnel ventilation system.
1.4.4
Ventilation station
Refers to a standalone structure or a structure
incorporated with other aboveground structures that houses equipment for
extracting air and is used in ventilation system.
1.4.5
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Refers to a combination of electrical engineering
equipment and auxiliary equipment together rooms accommodating vertical,
horizontal, diagonal ventilation channels and air extraction mechanisms.
1.4.6
Tunnel ventilation equipment
Refers to equipment for ventilating passenger areas
of underground stations, railway tunnels, dead-end tunnels, and connecting
tunnels.
1.4.7
Localized ventilation equipment
Refers to equipment for ventilating production,
recreational, administrative rooms and other rooms of underground stations and
underground structures.
1.4.8
Means of egress
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2. TECHNICAL PROVISIONS
2.1 General provisions
2.1.1 Location of railway line and
underground railway stations shall conform to approved planning.
2.1.2 Basic parameters of structures and
equipments of railway line must be capable of facilitating transport capacity
calculated on the basis of the highest expected passenger load in various
stages and in a manner that takes into account long-term urban development.
2.1.3 Entrance to underground railway
structures shall be so designed to prevent water from entering tunnels at
exceedance probability compliant with historical data of meteorology,
hydrology, and hydrogeology and climate change forecast data during structures’
service life.
2.1.4 Railway tunnel
Minimum depth at which railway tunnel is built
shall take into account protection for constructions above and feasibility of
road construction.
2.1.5 Station on underground railway line
a) Stations shall be located at crowded areas where
connectivity to other modes of transportation such as other railway stations,
roads, waterways is convenient and close to city attractions according to
approved planning.
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Escalators shall be installed in adequate
quantities so as to channelize passengers at the highest load in evacuation
situations from the moment in which emergencies occur at stations and other
simultaneous unfavorable situations such as one of the escalators is out of
service or suspended due to unexpected reasons.
c) Stations must satisfy accessibility for people
with disabilities and the elderly in accordance with QCVN 10:2014/BXD.
d) Corridors in stations and tunnels that are more
than 100 m in length must be outfitted with moving sidewalk.
e) Commercial areas, display areas, and other items
serving passengers must not obstruct traffic, passenger services and not affect
metro administration/management technology.
2.1.6 Soil conditions must be studied in
advance at expected limit states in general areas affected by interaction
between metro construction and operation and geological environment. Surveying
depth must be at least 10 m below the tunnel invert; surveying width must be at
least 4 times the depth at which tunnel invert is located and calculated from
the edges of the tunnel.
2.1.7 Underground railway structures shall
be designed in a manner that takes into load and natural factors according to
QCVN 02:2009/BXD and interaction between the structures and surrounding
geological environment.
2.1.8 External enclosing load-bearing
elements and internal load-bearing elements of railway structures and finishing
materials must satisfy strength, durability, fire safety, and integrity
requirements against various impacts of external environment.
2.1.9 Construction materials, structures,
and construction methods shall be determined so as to guarantee service life of
tunnel lining. Tunnel lining must be properly sealed, satisfactory to strength,
durability, safety, and integrity requirements, capable of accommodating normal
operation under various impacts of external environment.
2.1.10 Measures must be taken to prevent
surface runoff, groundwater, and other liquid from entering underground railway
structures. Solutions must be taken to prevent corrosion to underground railway
structures.
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2.1.12 Geotechnical - environmental
monitoring in underground railway structures, geological environment, adjacent
underground railway structures, and aboveground structures must be carried out
during construction, operation, and use of underground railway structures.
2.1.13 Construction quality of underground
railway structures must be inspected in accordance with applicable laws. During
operation and use, underground railway structures must be monitored,
supervised, and evaluated in order to detect safety risks to the structures and
adjacent structures.
2.1.14 Underground railway structures and
technical system must undergo periodic maintenance and service or replacement
so as to maintain normal operation capacity of the system as per design
throughout service life of the structures.
2.1.15 Technical system of underground
railway structures shall be so designed to meet safety requirements and energy
effectiveness and efficiency.
2.1.16 Air quality monitoring system of
underground railway structures shall be continuously operating and
independently supervised in order to ensure safe air quality.
2.1.17 Underground railway structures must
incorporate multiple purposes, including civil defense.
2.2 Ventilation of
underground railway structures
2.2.1 Ventilation and air-conditioning
system must be able to ensure air quality compliant with QCVN 05:2013/BTNMT and
QCVN 06:2009/BTNMT and employ appropriate treatment solutions such as
regeneration or closed-system ventilation and technical - technological
solutions serving such purposes.
2.2.2 Ventilation system must facilitate air
change and air velocity in work items of underground railway structures.
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b) Minimum air exchange volume is 30 m3/h
or 50 m3/h during peak hours for every passenger.
c) Maximum air velocity shall be:
- 15 m/s in main tunnels;
-8 m/s in vertical or horizontal tunnels;
- 5 m/s via vents;
- 0,5 m/s to 2 m/s in passenger areas.
e) Maximum carbonic (CO2) content at
crowded areas shall be 0,1% of volume.
2.2.3 Underground railway structures and
work items that are enclosed on the ground must be outfitted with system for
monitoring and examining air parameters as follows:
- Air temperature and humidity at one end of
station and machinery location;
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- Carbonic (CO2) content at both ends of
platform, corridors between stations, and crowded areas;
- Carbon monoxide (CO), toxic gas, combustible gas
content at underground sections that intersect gas-filled stratums, gas pipes,
and machinery location.
2.2.4 Ventilation in tunnels must
incorporate other structural technical solutions in smoke extraction mode in
order to ensure effective smoke protection for means of egress in underground
stations, enclosed aboveground stations, structures connecting stations, in
railway tunnels, dead-end tunnels, side tunnels, and other enclosed aboveground
work items.
2.2.5 Localized ventilation equipment shall
be outfitted to provide smoke protection for underground stations of
underground railway structures. Controlling equipment of localized ventilation
must have its automatic control turned off in case of fire. For the purpose of
smoke compartmentalization, additional technical solutions such as pressurized ventilation
equipment and partitions above platform spaces (intermediate spaces) of the
station must be installed. Ventilation for smoke protection in administrative,
medical, operation, commercial areas, and other areas must prevent smoke from
entering means of egress throughout evacuation period from underground railway
stations to outside space.
2.2.6 Location, intake and extraction
direction of vents must satisfy fire safety and urban environment requirements.
2.2.7 Smoke extraction outlets must be located
at areas where air quality requirements according to QCVN 05:2013/BTNMT and
QCVN 06:2009/BTNMT are met or, if possible, at existing or planned tree areas.
2.2.8 Separation distance from aboveground
ventilation stations to main roads and streets, enclosed parking garages,
commercial areas, and windows of adjacent structures and buildings must not be
lower than 25 m; to refueling stations, storage facilities of oil and oil
products, gas, wood materials, gas and oil pipes, oil processing and chemical industry
work items must not be lower than 100 m.
In respect of crowded urban areas, separation
distance of working ventilation stations under 2.2.8 can be lowered as long as
air quality according to QCVN 05:2013/BTNMT and QCVN 06:2009/BTNMT are met,
urban environment requirements pertaining to noise and vibration according to
QCVN 26:2010/BTNMT and QCVN 27:2010/BTNMT are met, and requirements pertaining
to structure construction, operation, and maintenance are met.
2.2.9 Distance between the ground and the
bottom of vents must not be lower than 2 m. Vents must also be positioned above
flood level where prone to flooding.
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2.2.11 Vents shall be so designed to prevent
unlawful access of humans, animals, and other foreign objects.
2.3 Water supply and drainage
of underground railway structures
2.3.1 Underground railway structures must be
outfitted with internal water supply and drainage system or separate systems
for tap water, water for firefighting, and water for technology. Localized
wastewater treatment system shall be taken into consideration in underground
railway structures so that wastewater is treated before being discharged into
local drainage system.
2.3.2 Technical requirements of supply and
drainage system for tap water and technology water shall conform to standards
applicable to water supply and drainage in structures and buildings. Technical
requirements of firefighting water supply system shall conform to 2.5.20
hereof.
2.3.3 Underground railway structures shall
be outfitted with system for collecting and draining water that permeates the
ceiling with damaged waterproofing, during firefighting, during cleaning, and
during operation of technology equipment.
2.4 Electricity supply and
lighting for underground railway structures
2.4.1 Electricity supply for underground
railway structures shall be done safely according to QCVN01:2008/BCT and QCVN
QTĐ 8:2010/BC pertaining to electricity safety. Cables used in electrical grids
must be non-combustible cables.
2.4.2 Electricity supply for underground
railway structures must be provided by two independent sources of city power
system and shall be so determined that in case one power source is interrupted,
the system still receives adequate electricity.
2.4.3 Order of priority for power supply:
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b) Type I: load network, elevators, tunnel lighting
network, automatic fire alarm, fire suppression, smoke extraction, water drainage,
protection devices and automatic payment devices.
c) Type II: power grid for lighting at stations,
d) Type III: ventilation equipment in tunnels and
other equipment.
2.4.4 Measures shall be taken to inspect and
protect underground railway structures and prevent current-induced corrosion.
2.4.5 Ensure the highest level of automation
of equipment operation, examine stipulated working modes, issue warning signals
for noncompliance with working modes of controlling devices. Electrical
equipment must be outfitted with localized control scheme, remote control
scheme, and automatic measurement.
2.4.6 Lighting system in underground railway
structures must adhere to technical requirements under applicable standards of
the structures. Lighting design appropriate to changes to luminous intensity at
entrance and exit of underground railway structures shall be implemented in
order to serve emergency evacuation in underground railway structures.
2.4.7 Service lighting and emergency
lighting systems must be separate. Working lighting at passenger areas in
stations can be uniform or localized.
2.4.8 Standard illuminance on a horizontal
plane at passenger areas at stations and connecting tunnels is prescribed under
Schedule 1. Permissible deviation of these values shall range between -10% to
+20%.
Schedule 1.
Standard illuminance
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Illuminated
surface
Lux
Station
Intermediate space and platform
Floor surface
200
Ticketing space
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200
Elevator area
-
100
Stair tread
Tread surface
100
Corridor between stations
Floor surface
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Entrance, connecting path
-
75
Connecting, branch, dead-end tunnel
Rail surface
20
Tunnel leading to and from platform, 25 m long
Rail surface
60
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≤ 5 m
Rail surface
1000
≤ 5 m to ≤ 25 m
-
750
≤ 25 m to ≤ 50 m
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500
≤ 50 m to ≤ 75 m
-
300
≤ 75 m to ≤ 100 m
-
150
≤ 100 m to ≤ 125 m
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≤ 125 m to ≤ 150 m
-
20
Platform at dead-end tunnel
Platform
30
2.4.9 Emergency lighting shall be installed
at passenger areas, production areas, recreational areas, and in tunnels.
Illuminance of emergency lighting shall equal 5% of standard value for service
areas to a minimum of 2 Lux for passenger areas and 0,5 Lux for tunnels.
2.5 Fire safety, prevention,
and firefighting in underground railway structures
2.5.1 Fire safety, prevention, and
firefighting systems used in underground railway structures must be operational
throughout the incipient stage, growth stage, and firefighting stage of a fire
and must allow safe access to fire areas and automatic, remote firefighting.
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2.5.3 Consideration shall be taken in order
to minimize the use of combustible materials in structure elements and
equipment of underground railway structures. Floor, wall, and partitions on
means of egress must be non-combustible materials. All doors installed in
underground railway structures must be fire-rated doors.
2.5.4 Underground railway structures shall
be outfitted with automatic firefighting devices and fire alarm systems capable
of accurately identifying target and location of fire.
2.5.5 All structural elements of underground
areas of underground railway structures must be compliant with fire risk grade
K0 according to QCVN 06:2010/BXD.
2.5.6 All aboveground lobbies of stations,
buildings, and structures affiliated to stopping stations and aboveground
building with other occupancies shall have minimum fire resistance grade of II
and minimum structural fire risk class of S1.
2.5.7 Fire-resistance rating of structural
elements of underground railway structures shall be compliant with Schedule 2.
Schedule 2:
Fire-resistance rating for underground urban railway structures
Structural
elements
Fire-resistance
rating, minimum
Linings of platform, central area, tunnel, and
structures adjacent to stations, tunnels
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Linings of train tunnels, dead-end tunnels
R90
Station pillars
R90
Partitions of elevator shafts, stairwells in
tunnels.
REI 120
Walls of stairwells
REI 120
Walls of auxiliary stations
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Walls, ceilings of storage facilities of oil,
combustible paint
REI 120
Linings of elevator tunnels and station lobbies
R60
Walls separating walkways and cable-air
R 45
Girders, stairs, stairwells
R60
Internal coatings of girders
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Walls (partitions) of means of egress between
tunnels
R 45 (EI 45)
Auto-closing fire-rated doors
EI30
Load-bearing and overhead enclosing structures of
platform and walkways of stations
REI 90
Suspension ceilings in corridors
RE 15
2.5.8 Connecting structural elements of
corridors in aboveground sections (or elevated sections) and enclosed
aboveground stations must have minimum fire risk class K0 and minimum
fire-resistance rating R45.
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2.5.10 Partitions in cable tunnels shall
consist of Ch1 materials with minimum fire-resistance rating of EI45.
Cable tunnels and chambers of stations must contain
at least one partition.
Partitions shall consist of Ch1 materials. Entrance
and exit of tunnels and partitions must consist of Ch2 materials or higher with
minimum fire-resistance rating of EI30. All fire compartments shall be
outfitted with automatic fire alarm system.
2.5.11 Where lobbies of stations are
adjacent to or within buildings used for other occupancies, they must be
physically separated by walls and floor consisting of Ch1 materials and
containing direct exit that leads outside.
2.5.12 Underground spaces shall be outfitted
with fire-rated doors of which minimum fire-resistance rating is:
a) Doors on walls and partitions: EI30;
b) Doors on partitions between corridors over
sections not greater than 60 m in length: EI15;
c) Doors on other partitions: EI15.
2.5.13 Materials of which fire risk
properties are higher than Ch1, BC1, SK1, ĐT1 must not be used for drainage
surfaces in passenger areas of stations.
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2.5.15 Structural elements and floors of
station structures shall be covered by non-combustible materials.
Walls and floors on means of egress must be
plastered or tiled by non-combustible materials or coated by non-combustible
paint.
Separate structural elements, plastering and tiling
layers of walls, ceiling of stations can utilize materials of which fire risk
properties are not lower than Ch1, BC1, SK2, ĐT2 if adequate basis is provided.
2.5.16 In respect of station areas
frequented by employees, flooring materials must not have fire risk properties
lower than Ch2, BC2, LT2, SK2, ĐT2.
In respect of recreational areas and production
areas and other areas not frequented by employees, flooring materials shall be
non-combustible materials.
2.5.17 Sound absorbing layers of spaces and
structural elements of suspension ceilings shall be non-combustible materials.
In respect of recreational spaces, plastering and tiling layers must not
consist of materials of which fire risk properties are lower than Ch2, BC3,
SK3, ĐT3.
2.5.18 Seats on platform shall consist of
non-combustible materials; seat surface shall consist of materials of which
fire risk properties are not lower than Ch2, SK2, ĐT2.
2.5.19 Floors of ventilation cable
compartments in escalator compartments must be properly sealed and must have
minimum fire-resistance rating of REI 45. Exits of ventilation channels that
lead to ground level must be at least 15 m away from lobby entrance.
2.5.20 A minimum of two fire hydrants shall
be connected to city water system and installed at most 100 m away from
entrance of shallow-sitting stations and at most 20 m away from aboveground
lobbies or entrance to lobbies of deep-sitting stations.
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2.5.21 Fire hydrants shall be installed in
vicinity of train stop areas where spacing between hydrants is not greater than
100 m. The aforementioned requirement also applies to areas in vicinity of
buildings. These hydrants shall be outfitted with light indicators.
2.5.22 For the purpose of supplying water
for firefighting in vicinity of train parking stations, external water sources
(water tanks) can be used as long as they are always available for use.
2.5.23 Underground buildings, structures,
and spaces shall be outfitted with automatic fire alarm and firefighting
systems in accordance with Schedule 3.
Areas on station pathways (dead-end paths) and
areas where trains stop at night shall be outfitted with localized firefighting
systems.
Schedule 3.
Buildings, structures to be outfitted with fire alarm and firefighting devices
Building,
structure, equipment
Automatic
firefighting equipment
Automatic fire
alarm
Cable channels and tunnels in stations, cable
floors with nominal fire load
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180 MJ/m2
and lower
Ventilation cable channels
-
Regardless of area
Electricity distribution space
-
Regardless of area
Electrical panel
-
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Storage facilities of oil, combustible paint
Regardless of area
-
Building spaces with class A fire hazards
Regardless of area
-
Building spaces with class B, class C fire
hazards
300 m2
and greater
Less than 300 m2
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-
-
Indoor repair and rest areas train stop of train
stations within coverage of fire compartments
4500 m2
and greater
Less than 4500 m2
2.5.24 Each station, structure in vicinity
of station, and tunnels connecting stations shall be outfitted with
announcement system for guiding evacuation process in case of fire and in case
of emergency.
2.5.25 Underground spaces of stations and
adjacent structures of tunnels shall be outfitted with rudimentary firefighting
equipment.
2.5.26 Primary storage facilities for
combustible materials shall be located in aboveground sections of underground
railway structures.
Secondary storage facilities for oil and
combustible paint shall be located at the same elevation as walkways for
walking passengers and machine rooms for escalators.
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Means of egress that lead to lobbies of underground
stations with 3 floors (or more) containing production, operation, sanitary,
recreational, and other service spaces shall be outfitted with smoke protection
measures for employees.
2.5.28 Smoke protection measures for means
of egress in train tunnels shall be:
- Direction of air flow shall be the opposite from
that of evacuation and shall be unchanged in sections where direction of air
flow can easily be altered if people in the area evacuate in one direction
relative to the source of fire.
- If people in the area evacuate in two directions
relative to the source of fire, reduce air velocity in tunnels to 0,5 m/s.
For the purpose of providing smoke protection for
stations and tunnels, tunnel ventilation equipment and localized ventilation
equipment shall be installed. For the purpose of smoke compartmentalization,
special ventilation equipment and partitions above platform spaces
(intermediate spaces) of the station must be installed.
2.5.29 Smoke protection system shall be
installed according to calculation and in a manner that takes into account the
following situations at the minimum:
a) For stations:
- Fire breaks out in the first, the middle, or the
last carriage on any rail at station;
- Fire breaks out in escalator compartments or
machine rooms of escalators and in lobbies;
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b) For train tunnels: fire breaks out in trains.
2.5.30 Ventilation for smoke protection in
administration, medical, commercial spaces and other spaces must be able to
prevent smoke from entering means of egress throughout period in which people
evacuate from stations to outside spaces.
2.6 Emergency exit
2.6.1 Ensure thorough evacuation from
underground railway structures in case of fire and other emergencies. Means of
egress shall be outfitted with means for limiting dangerous impact of fire on
humans and must not contain obstacles that may obstruct evacuation process.
2.6.2 Emergency exit from platform shall be:
a) Escalators and/or type 2 stairs, via ticketing
spaces, lobbies, connecting underground paths to outside spaces;
b) Structures for changing trains to stations of
other railway lines or according to a)
2.6.3 Length of dead-end sections of spaces
and structures (corridors, cable tunnels, ventilation channels) shall not be
greater than 25 m.
2.6.4 Quantity and total length of exits
from spaces, floors of buildings and structures hall be determined by the
highest number of people to be evacuated and separation distance between
locations frequented by employees to the nearest emergency exits.
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2.6.6 In respect of stations where transit
stations are incorporated with common lobbies, ensure separate operating
capability of the stations and prevent the presence dangerous factors in case of
fire at any station.
2.6.7 In respect of recreational and
production rooms, width of corridors and stairs shall not be lower than:
a) 1,2 m for corridors;
b) 1 m for stair stringer width;
c) 0,8 m for open stairs between levels in
auxiliary stations.
Width of landing shall not be lower than that of
stringer.
2.6.8 Where trains stop in-between stations
to allow passengers to evacuate, means of egress shall be positioned on one
side of single-tube train tunnels or on both sides of double-tube train tunnels.
Width of means of egress from tunnels at a height
of 1,5 m from walking surface shall not be lower than 0,7 m.
2.6.9 For the purpose of evacuating
passengers, means of egress that run along train tunnels towards adjacent
stations shall be installed and accompanied by instruction signs indicating
direction and distance to the nearest stations. Width of means of egress shall
be 0,6 m to 0,9 m; elevation of walking surface shall match that of approach
platform; minimum clear height shall be 2 m; handrails shall be installed on
the side of tunnel linings.
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NOTE: Area of refuge refers to a separate
underground space where passengers can remain in case of dangerous situations
in train tunnels. Such area shall be outfitted with separate fire safety, lighting,
communication, ventilation, drainage system.
2.6.11 Volume of area of refuge shall be
determined by the highest number of passengers at any operating stage at a
standard rate of 1 m2 per person.
Calculated duration where passengers remain at areas
of refuge shall be at least 7 hours. Each area of refuge shall be so designed
as a separate fire compartment.
2.7 Information and
communication in underground railway structures
2.7.1 Underground railway structures shall
be outfitted with automatic operation information and conversation information
stations, systems.
2.7.2 Operation information consists of
control information between controlling stations, information delivered via
train operation radio, information pertaining to security, order, fire safety,
and services.
Conversation information generally facilitates
coordination and control of train operation and services.
All controlling information shall be recorded by
recording devices.
2.7.3 Information stations shall contain
information in form of conversation, electric meters, speakers, monitoring
screens for the purpose of examining train operation, adjusting passenger
flows, control order from control stations regarding passenger evacuation in
case of fire and communication of control stations and other figureheads with
employees at stations and vicinity of stations.
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2.8.1 Environmental conditions inside
underground railway structures shall satisfy requirements pertaining to air
environment (cleanliness, composition and concentration of gas, dust, smoke,
temperature, humidity, velocity of air), lighting, noise, vibration depending
on occupancy of work items, quantity and duration of stay of passengers and
employees in underground railway structures.
NOTE: Air environment quality, lighting, noise, and
vibration shall conform to standards and technical regulations applicable to
structures.
2.8.2 In respect of underground stations
occupied by employees and passengers, mechanical ventilation system with
minimum air change rate of 3 times/h shall be required. In crowded areas, air
change shall be determined by calculation so that volume of air supplied is not
lower than 60 m3/h/person and emergency smoke extraction ventilation
system shall be so designed to ensure safe evacuation for humans.
NOTE: Crowded areas are rooms of which area equals
to or exceeds 50 m2 and density of temporary or regular occupants
exceeds 1 person/m2.
2.8.3 Technical requirements pertaining to
noise and vibration protection for underground railway structures and
surrounding structures, environment shall conform to environment regulations
under technical standards applicable to structures.
2.8.4 Solutions for eliminating or mitigating
excessive vibration and noise that escape to the outside shall be designed and
adopted.
2.8.5 Underground railway structures must
not damage/infringe upon existing water works and hydrogeology conditions of
nearby areas.
2.8.6 Solutions must be taken in order to
protect houses and urban structures during construction and operation of
underground railway lines.
2.8.7 Solutions must be taken in order to
mitigate noise and vibration of stations and buildings located along railway lines,
during train operation, during escalator operation, and during operation of
other equipment of underground trains.
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2.8.9 Solutions must be taken in order to
protect and examine effectiveness of current-induced corrosion preventive
measures during operation of underground trains.
3. REGULATIONS ON MANAGEMENT
3.1 Investment projects and construction
design dossiers for construction or renovation of underground railway
structures shall be companied by presentation regarding compliance with QCVN
08:2018/BXD.
3.2 Inspection of projects and design
dossiers of underground railway structures; examination, commissioning, and
operation of underground railway structures; maintenance operation shall
conform to this regulation and be carried out in accordance with applicable
construction investment laws. In special cases, the Ministry of Construction
shall only allow replacement to provisions hereunder if adequate technical
dossiers are submitted to the Ministry of Construction. Such technical dossiers
must include alternative design solutions that utilize technical documents
(technical standards, technical regulations) of developed countries and must be
inspected and approved by competent field-specific authorities.
4. ORGANIZING IMPLEMENTATION
4.1 The Ministry of Construction is
responsible for publicizing and guiding implementation of QCVN 08:2018/BXD.
4.2 Local construction authorities are
responsible for arranging examination for compliance with QCVN 08:2018/BXD in
construction investment and management, operation of underground railway
structures in their jurisdiction in accordance with applicable regulations on
construction investment.
4.3 In respect of projects approved and
commenced before the effective date of QCVN 08:2018/BXD, approved framework of
regulations and standards shall prevail. In respect of projects approved but not
commenced before the effective date of QCVN 08:2018/BXD, implementation of
these projects shall conform to QCVN 08:2018/BXD.
4.4 Difficulties that arise during
implementation of this document shall be reported to Science - Technology and
Environment Department (the Ministry of Construction).