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GB 50720-2011 English PDF (GB50720-2011)

GB 50720-2011 English PDF (GB50720-2011)

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GB 50720-2011: Technical code for fire safety of construction site

This code is formulated with a view to preventing fire accidents on construction site, reducing fire hazards and protecting personal and property safety. This code is applicable to the fire protection on various newly-built, rebuild and expanded construction sites.
GB 50720-2011
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
UDC
P GB 50720-2011
Technical Code for Fire Safety of Construction Site
ISSUED ON: JUNE 6, 2011
IMPLEMENTED ON: AUGUST 1, 2011
Jointly issued by: Ministry of Housing and Urban-Rural Development of
the People's Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 General Provisions ... 7
2 Terms ... 8
3 General Plan Layout ... 9
4 Fire Protection of Construction Site ... 13
5 Temporary Fire Control Facilities ... 17
6 Fire Safety Management ... 24
Explanation of Wording in This Code ... 31
List of Quoted Standards ... 32
1 General Provisions
1.0.1 This code is formulated with a view to preventing fire accidents on construction site, reducing fire hazards and protecting personal and property safety.
1.0.2 This code is applicable to the fire protection on various newly-built, rebuild and expanded construction sites.
1.0.3 Fire protection must conform to relevant state policies and reliably fire precaution measures, on a basis of self-prevention and self-rescue, shall be taken for different characteristics of fire accidents on construction site to achieve safe, reliability, economy, rationality and convenience.
1.0.4 Fire protection on construction site shall not only conform to this code but also comply with those in the current relevant ones of the nation.
2 Terms
2.0.1 Temporary construction
It refers to various non-permanent buildings built at the construction site and serving for the construction, including office buildings, dormitories, kitchen rooms, canteens, boiler rooms, generator rooms, power distribution rooms, warehouse, etc.
2.0.2 Temporary facility
It refers to various non-permanent facilities built at the construction site and serving for construction, including fences, gates, temporary roads, materials storage yard and processing yard, fixed fire work field, work shed, machinery shed, reservoir as well as temporary water supply and drainage, power supply and heating pipelines.
2.0.3 Temporary fire control facility
It refers to various fire control facilities arranged at construction site and used for extinguishing fire accidents and guiding safe evacuation of builders, including fire extinguishers, temporary fire water supply system, fire emergency lighting, evacuation signs, temporary evacuation routes.
2.0.4 Temporary evacuation route
It refers to the route for personnel safely evacuate the danger area and arrive at safe place or safe zone when there is fire or other accidents on the construction site.
2.0.5 Temporary fire-fighting and rescue site
It refers to the site used for fire-fighting and rescue by the personnel and equipment on construction site.
3 General Plan Layout
3.1 General Requirement
3.1.1 The layout of temporary construction and temporary facilities shall meet the requirements of on-site fire protection, fire extinction and safe evacuation of personnel.
3.1.2 The following temporary construction and temporary facilities shall be included in the general plan layout of construction site:
1 The exit/entrance, fence, enclosing and blocking.
2 Temporary road on site.
3 The laying or erection direction and height of supply pipe network or piping and distribution lines.
4 Office buildings, dormitories, generator rooms, power transformation and distribution rooms, combustible material warehouses, inflammable & explosive dangerous goods warehouse, combustible material storage yard and
processing yard, fixed fire work field, etc. on the construction site.
5 Temporary fire lane, fire-fighting and rescue site and fire water sources. 3.1.3 The arrangement of the exit and entrance of construction site shall meet the requirements of fire vehicles and in different directions with a quantity of no less than 2. If only one exit and entrance is arranged according to the condition, ring road shall be arranged on the construction site to allow the pass of fire vehicles.
3.1.4 The temporary functional zone for office, living, production and material storage should be relatively independent; the fire separation shall conform to provisions living Articles 3.2.1 and 3.2.2 in this code.
3.1.5 The fixed fire work field shall be arranged on the windward side with minimum rate all year around of combustible material storage yard and
processing yard and inflammable & explosive dangerous goods warehouse;
should be arranged on the windward side with minimum rate all year around of temporary office buildings, dormitories, combustible material warehouses and buildings during construction.
3.1.6 Inflammable & explosive dangerous goods warehouse shall be far away from fire working, personnel-intensive and buildings relatively concentrated areas.
4 Fire Protection of Construction Site
4.1 General Requirement
4.1.1 Fire protection measures such as reliable fire separation and safe evacuation shall be taken for temporary construction and buildings during construction.
4.1.2 The fire protection design of temporary construction shall be determined according to the service purpose and fire hazard.
4.1.3 The fire protection design of buildings during construction shall be determined according to the construction property, building height, building size and structural features.
4.2 Fire Protection for Temporary Construction
4.2.1 Fire protection design of dormitories and office buildings shall meet the following requirements:
1 The flammability level of building member is Class A. Where metal
sandwich panels are adopted, the flammability level of the core material shall be Class A.
2 The floor number of buildings shall not exceed 3 and the building area of each floor shall not be greater than 300 m2.
3 Where the floor number is 3 or the building area of each floor is larger than 200 m2, at least 2 emergency staircases shall be arranged and the
maximum distance from the room emergency door to the emergency staircase shall not be larger than 25 m.
4 Where the room is arranged on a single side, the clear width of the
evacuation walkway shall not be less than 1.0 m; where the room is arranged on double sides, the clear width of the evacuation walkway shall not be less than 1.5 m.
5 The clear width of the emergency staircase shall not be less than the clear width of the evacuation walkway.
6 The building area of dormitory rooms shall not be larger than 30 m2 and the building area of other rooms should not be larger than 100 m2.
7 The distance from any point of the room to the nearest emergency door shall not be larger than 15 m and the clear width of the room door shall not be less than 0.8 m; where the building area of the room exceeds 50 m2, the clear completion of buildings during construction are used as temporary evacuation route, the clear width should not be less than 1.0 m; for the access ladder used for evacuation and the temporary evacuation route arranged on scaffold, the clear width shall not be less than 0.6 m.
3 Where the temporary evacuation route is a ramp and the gradient is larger than 25??, staircase, steps or anti-slip strips shall be constructed.
4 Access ladder should not be adopted for temporary evacuation route.
Where the access ladder is required, reliable fixation measures shall be taken. 5 If the side of the temporary evacuation route is a free face, protective barrier at a height no less than 1.2 m shall be arranged along the free face. 6 Where the temporary evacuation route is arranged on the scaffold, the scaffold shall be erected by incombustible materials.
7 The temporary evacuation route shall be set with unambiguousness
evacuation signs.
8 The temporary evacuation route shall be set with lighting facilities. 4.3.3 Where the building is constructed for expansion and renovation, the construction area and non-construction area must be divided clearly. The construction area shall not be open for operation, application and
dwelling; where the non-construction area remains open, used and
dwelled, it shall meet the following requirements:
1 The construction area and non-construction area shall be separated
non-combustible partition wall with fire resistance no less than 3.0 h and without door, window or opening.
2 Fire control facilities in non-construction area shall be in good
condition and effective; the evacuation route shall maintain unimpeded; the daily shift and fire safety management system shall be implemented. 3 Specific personnel shall be arranged for the fire safety of
construction area to handle any fire accident immediately.
4 The construction organization shall carry out fire-fighting publicity and education to the residents and users and inform them of the position and use method of building fire control facilities and evacuation route, furthermore, the construction organization shall organize evacuation
drills.
5 The erection of external scaffold shall not affect the safe evacuation, normal passing of fire vehicles, fire extinction and rescue; the erected 5 Temporary Fire Control Facilities
5.1 General Requirement
5.1.1 Temporary fire control facilities such as fire extinguisher, temporary fire water supply system and emergency lighting shall be arranged on the
construction site.
5.1.2 The temporary fire control facilities shall be arranged synchronously with the buildings during construction. In the building construction, the time gap between the arrangement of temporary fire control facilities and the
construction schedule of major structures of buildings during construction shall not exceed 3 floors.
5.1.3 The permanent fire control facilities with service conditions may be adopted as the temporary fire control facilities for the buildings during construction. Where the permanent fire control facilities cannot meet the operation requirements, temporary fire control facilities shall be arranged additionally and shall conform to provisions of Articles 5.2 ~ 5.4 in this code. 5.1.4 The fire hydrant pump on construction site shall be special fire- fighting distribution line which shall be wired in from the general circuit- breaker of the general distribution box on construction site and shall keep uninterrupted power supply.
5.1.5 Gas masks shall be equipped for the construction site of underground works.
5.1.6 The reservoir, fire hydrant pump, indoor fire standpipe and pump adapter of temporary fire water supply system shall be set with eye-striking marks. 5.2 Fire Extinguisher
5.2.1 The following places of buildings during construction or temporary construction shall be equipped with fire extinguishers:
1 Places storing and using inflammables and explosives.
2 Hot work places.
3 Places storing, processing and using combustible materials.
4 Temporary constructions such as kitchen room, boiler room, generator
room, power transformation and distribution room, room for equipment, office accommodation and dormitory.
Table 5.3.5 -- Temporary Outdoor Fire Water Consumption of Temporary
Construction
Building area of temporary
construction
Duration time of fire
hazard (h)
Fire-hydrant water
consumption (L/s)
Minimum discharge
per water branch
(L/s)
1000 m2 < Area ??? 5000 m2 1 10 5 Area > 5000 m2 15 5
5.3.6 Temporary outdoor fire water consumption of buildings during
construction shall not be less than that specified in Table 5.3.6.
Table 5.3.6 -- Temporary Outdoor Fire Water Consumption of
Construction in Progress
Construction in progress (monomer)
volume
Duration time of fire
hazard (h)
Fire-hydrant water
consumption (L/s)
Minimum discharge
per water branch
(L/s)
10000 m2 < Volume ??? 30000 m3 1 15 5
Volume > 30000 m5 2 20 5
5.3.7 Temporary outdoor fire water supply system of construction site shall be arranged according to the following requirements:
1 The supply net should be arranged in circle.
2 The main pipe diameter of temporary outdoor fire water supply shall be calculated according to temporary fire water consumption in construction site and the calculation flow speed in main pipe, and shall not be less than DN100. 3 The outdoor fire hydrant shall be arranged uniformly along the buildings during construction, temporary construction, combustible material yard and its processing space with a distance to the outside edge not less than 5 m. 4 Interval of fire hydrant is not greater than 120 m.
5 The maximum travel distance of fire hydrant shall not be greater than 150 m.
5.3.8 For the constructions in progress with building height greater than 24 m or monomer volume exceeding 30000 m3, the temporary indoor fire water
supply system shall be installed.
5.3.9 Temporary indoor fire water consumption of buildings during
construction shall not be less than that specified in Table 5.3.9.
the properly floors; the effective volume of transfer water tank shall not be less than 10 m3, and the dispersion between the upper and lower transfers should not exceed 100 m.
5.3.15 The feed pressure of temporary fire water supply system shall be with the length of substantial water column of the fire water branch no less than 10 m, otherwise at least 2 fire hydrant pumps (standby for each other) shall be installed. The fire hydrant pump should be arranged with automatic starting device.
5.3.16 Where the external fire water source shall not meet the fire water consumption at construction site, temporary reservoir shall be arranged at the construction field. Temporary reservoir should be arranged in place convenient for fire engine getting water, and the effective volume shall not be less than the total fire water consumption used for one fire extinction in the duration of fire hazard.
5.3.17 The temporary fire water supply system shall be merged to setup with production & domestic water system at construction site, but the emergency closing valve turning the production & domestic water supply to fire water shall be installed. The number of emergency closing valves installed shall not exceed 2 and shall be installed in easy-to-operate place with obvious marks.
5.3.18 Anti-freezing measures shall be taken for temporary fire water supply system in chill and cold area.
5.4 Emergency Lighting
5.4.1 The following places at construction site shall be equipped with temporary emergency lighting:
1 House generator room and power transformation and distribution room.
2 Water pump house.
3 Workplace without natural lighting and evacuation route.
4 Indoor evacuation route with height exceeding 100 m at buildings during construction.
5 Other places where requiring working even fire hazard occurs.
5.4.2 Illuminance of emergency lighting at workplace shall not be less than 90 % of that required in normal works; the illuminance value of evacuation route shall not be less than 0.5 lx.
5.4.3 Self-powered emergency light should be used in temporary fire
6 Fire Safety Management
6.1 General Requirement
6.1.1 The fire safety management at construction site shall be in the charge of construction organization.
The general contract of construction shall be in the charge of the general contract organization. The subcontractor shall be responsible for the general contract organization and submit to the management of the general contract organization and undertake the fire control responsibility and obligation specified in state laws and regulations.
6.1.2 Supervision organization shall take charge of the fire safety management at the construction site.
6.1.3 The construction organization shall establish fire safety administrative organization and voluntary fire control organization based on the construction project size and the emphases of the fire safety management. The fire safety principal management personnel shall be defined and the fire safety
management responsibility of relevant personnel shall be implemented
simultaneously.
6.1.4 The construction organization shall formulate fire safety management system specific to the construction operation having potential fire hazard and other activities at construction site. Fire safety management system shall include the following content:
1 Fire safety education & training system.
2 Management system of combustibles, explosives and dangerous articles. 3 Management of fire, electricity and gas.
4 System of fire safety inspection.
5 System of emergency Pre-arranged planning drilling.
6.1.5 The construction organization shall compile the fire-protection technical proposal at construction site and make modification timely according to the site situation. The fire-protection technical proposal shall include the following contents:
1 Identification of great ignition sources at construction site.
2 Fire-protection measures at construction site.
safety management personnel to inspect the construction site for fire safety regularly. The fire safety inspection shall include the following contents: 1 Whether the managements of combustibles, explosives and dangerous
articles are implemented or not.
2 Whether the fire control measures of hot work are implemented or not. 3 Whether the use of fire, electricity and gas having operations against rules; whether the operation regulations are executed in construction of electro-gas welding, heat preservation and waterproof.
4 Whether the temporary fire control facilities are intact and effective. 5 Whether the temporary fire lanes and temporary evacuation facilities are unimpeded.
6.1.10 The construction organization shall make emergency evacuation drilling regularly based on the scheme of fire extinction and emergency evacuation. 6.1.11 The construction organization shall make and preserve the associated files and records regarding fire safety management at construction site and shall file the fire safety management at construction site.
6.2 Management of Combustibles, Explosives and Dangerous Articles
6.2.1 The flammability level of materials for the thermal insulation, water resistance, decoration and corrosion protection of buildings during
construction shall meet the design requirements.
6.2.2 The combustibles, explosives and dangerous articles shall approach the construction site by a limited quantity as scheduled. After approaching the construction site, the combustible materials should be stored in the storehouse; where stored in the open air, the combustible materials shall be stacked lower than 2 m according to different categories; the volume of single stack shall not exceed 50 m3 and the minimum distance between stacks shall not be less than 2 m, and incombustible or nonflammable materials shall be used to cover those stacks; the hazardous inflammables and explosives shall be specially stored according to different categories; the storehouse shall be well ventilated and a sign shall be provided, stating that open fire is strictly forbidden.
6.2.3 Where paints and their organic solvent, ethylene diamine, adhesive bitumen primer as well as other materials which is highly volatile to
produce inflammable gases are used indoor for construction, the indoor
shall be well ventilated; meanwhile, open fire shall be strictly forbidden in workplace and static electricity shall be avoided.
requirements:
1 The desi...

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