How to classify the fire risk grade of building fire protection

1. Light danger level: hotels and office buildings with a building height of 24m or less. Only the buildings in close system are set in the walkways.

2. medium dangerous level: high-rise civil buildings: hotels, office buildings, comprehensive buildings, postal buildings, financial and telecommunications buildings, command and dispatch buildings, radio and television buildings (towers), etc.

(1) public buildings (including single-storey and multi-storey buildings): hospitals, sanatoriums, libraries (except stacks), archives, exhibition halls (halls), theaters, concert halls and auditoriums (except stages) and other places of entertainment, railway stations, airports and docks, shopping malls with a total construction area of less than 5, ㎡, and shopping malls with a total construction area of less than 1, ㎡.

(2) Cultural heritage buildings: ancient wooden buildings, national cultural relics protection units, etc.

(3), industrial buildings: materials preparation and production workshops of food, household appliances, glass products and other factories, cold storage, steel roof truss and other building components.

(4) Civil buildings: stacks, stages (except grape racks), car parking lots, shopping malls with a total construction area of 5, ㎡ and underground shopping malls with a total construction area of 1, ㎡ and above.

(5) industrial buildings: the preparation and production workshops of cotton, wool, linen and chemical fiber textiles, fabrics and products, wood, wood and plywood, grain processing, tobacco and products, drinking wine (except beer), leather and products, paper and paper products, pharmaceuticals and other factories.

3. Serious danger level: materials preparation and workshops of printing plants, alcoholic products and flammable liquid products.

(1), flammable liquid spraying operation area, solid flammable materials, flammable aerosol products, solvents, paints, asphalt products and other factories, and the lower part of the production workshop, studio and stage "grape trellis".

4. Warehouse risk level: food, tobacco, alcohol, wooden cases, non-combustible articles packed in cartons, shelf areas of warehouse-type shopping malls, etc.

(1), wood, paper, leather, grains and products, cotton, wool, linen, chemical fiber and products, household appliances, cables, group B plastics and rubber and their products, steel-plastic mixed materials products, various non-combustible articles packed in plastic bottles and warehouses where various articles are mixed.

(2), group A plastics and rubber and their products, asphalt products, etc.

Extended information

I. Classification of fire resistance limit

The fire resistance limit of building components refers to the fire resistance test according to the time-temperature standard curve of building components, which is expressed in hours from the time when it is subjected to fire to the time when it loses its support ability or integrity or loses its fire-proof function. The specific judging conditions are as follows:

1. Loss of supporting capacity

2. Integrity is destroyed

3. Loss of fire-proof function

2. Classification of combustion performance

The combustion performance of components is divided into three categories:

1. Noncombustible body: that is, building components made of non-combustible materials, such as natural stone.

2. Combustor: a building component made of combustible or combustible materials, such as wood.

3. Refractory body: that is, building components made of refractory materials, or building components made of combustible materials with incombustible materials as protective layers, such as asphalt concrete components.

fourth, the purpose of determining the fire resistance rating of buildings is mainly to make buildings with different uses have corresponding fire resistance, so as to realize the unity of safety and economy.

The following factors are mainly considered in determining the fire resistance rating of buildings:

1. Importance of buildings.

2. Fire hazard of buildings.

3. the height of the building.

4. Fire load of buildings.

Reference: Baidu Encyclopedia-Fire Hazard Rating

Reference: Baidu Encyclopedia-Building Fire Resistance Rating.