When the included angle between two adjacent buildings is greater than or equal to 90 degrees but less than 135 degrees, the horizontal distance between the nearest door and window openings shall not be less than 6m; 3.
When the doors, windows and openings on the opposite exterior wall are not aligned, and the sum of the areas of the doors, windows and openings is not more than 5% of the wall area, the fire separation can be reduced by 25%; 2.
3 The fire separation distance between storage yards shall be the nearest horizontal distance between the outer edges of adjacent stacks in two storage yards.
When the included angle between two adjacent buildings is greater than or equal to 135 degrees but less than 180 degrees, the horizontal distance between the nearest door and window openings shall not be less than 4m; 4.
Whether the balcony on the outer wall is open or not, the fire separation distance shall be calculated from the outer edge computing of the balcony breast board.
2 The fire separation between tanks shall be the nearest horizontal distance between the outer walls of two adjacent tanks.
The window shall be equipped with heat sensitive elements such as fusible alloy parts or glass balls, which can automatically close the window sash in case of fire.
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When the included angle between two adjacent buildings is greater than or equal to 180 degrees but less than 270 degrees, the horizontal distance between the nearest door and window openings shall not be less than 2m; 5.
The fire separation distance between the transformer and the building, storage tank or storage yard shall be the nearest horizontal distance from the outer wall of the transformer to the outer wall of the building, the outer wall of the storage tank or the outer edge of the adjacent stack.
If the outdoor evacuation stairs of the building are made of incombustible materials and do not affect the passage of fire engines and fire fighting rescue, the outdoor evacuation stairs may not be considered for fire separation.
2、 When setting firewalls, when setting firewalls between two adjacent buildings to meet the conditions of unlimited or reduced fire separation, the following provisions shall be met (Figure 1,2): 1.
When the external walls have protruding combustible or fire-resistant components, it shall be calculated from the outer edge of the protruding part.
Natural resources and ecological environment 1.
The fire separation distance between buildings shall be calculated according to the nearest horizontal distance of the external walls of adjacent buildings.
Calculation method of fire separation distance 1.
5 The fire separation distance between buildings, storage tanks or yards and roads and railways shall be the minimum horizontal distance between the outer walls of buildings, storage tanks or adjacent stacking edges and the nearest side of the road or railway centerline.
If there is an insulation layer, it shall be calculated from the outer skin of the insulation layer; 7.
The fire separation between the storage tank and the yard shall be the nearest horizontal distance from the outer wall of the storage tank to the outer edge of the adjacent stack in the yard.
2 No matter whether the ground mechanical garage has an enclosure or not, the fire separation shall be controlled according to the garage.
3、 U-shaped building 2.1.3 When U-shaped space is formed between different units of residential building, the distance between doors, windows and openings on the relative external wall shall not be 6m.
When the included angle between two adjacent buildings is greater than or equal to 270 degrees, the distance between the doors, windows and openings on both sides of the firewall is unlimited.
When the included angle between two adjacent buildings is less than 90 degrees, the horizontal distance between the nearest door and window openings shall not be less than the fire separation of buildings of corresponding category, height and fire resistance rating; 2.
4、 When the underground entrances and exits of non motor vehicles and motor vehicles are not equipped with fire doors and fire rolling shutters, the fire separation between the ground opening edge of the ramp and the external doors and windows of the adjacent buildings above the ground shall not be less than 6m.
The outer edge of the fire barrier protruding from the outer wall shall be flush with the outermost edge of the opposite outer window; 3.
The fire separation between buildings and storage tanks and yards shall be the nearest horizontal distance from the external wall of the building to the outer wall of the storage tank or the outer edge of adjacent stacks in the yard.
When it is really difficult to meet the requirements of 6m, the following requirements shall be met: 1.
When a fire barrier with a fire endurance of no less than 1.0h is set, the distance is unlimited.
6.
When doors, windows and openings on both sides adopt windows with fire resistance integrity not less than 1.0h, the distance is unlimited.
4 The fire separation between transformers shall be the nearest horizontal distance from the outer wall of adjacent transformers.
