Analysis of the main factors affecting the integrity of fire doors

A fire door is a door that can meet the requirements of fire stability, integrity and heat insulation within a certain period of time. It is a fire partition with a certain degree of fire resistance, such as fire compartments, evacuation stairwells, and vertical shafts. In addition to the function of ordinary doors, fire doors also have the function of preventing the spread of fire and smoke, which can ensure the evacuation of people within a certain period of time.

According to the material, it can be divided into four categories: wood fire doors, steel fire doors, steel wood fire doors and other materials fire doors; according to the heat insulation performance can be divided into: heat insulation fire doors (A type), partial heat insulation Fire doors (Class B) and non-insulated fire doors (Class C). Insulated fire doors are classified into Class A (fire resistance time 1.50h), Class B (fire resistance time 1.00h) and Class C according to their fire resistance performance. Fire resistance time 0.50h).

Wooden fire doors: use flame-retardant wood or flame-retardant wood products as door frames, door leaf frames, and door leaf panels.

Steel fire door: Use steel material to make door frame, door leaf frame and door leaf panel. If the door leaf is filled with materials, it is filled with non-toxic and harmless fire-proof and heat-insulating materials, and equipped with fire-proof hardware accessories. Doors with certain fire resistance.

Steel and wood fire doors: Use steel and flame-retardant wood materials or flame-retardant wood products to make door frames, door leaf frames, and door leaf panels.

Fire doors of other materials: use inorganic non-combustible materials other than steel, non-combustible wood or non-combustible wood products, or partly use steel, non-combustible wood, and non-combustible wood products to make door frames, door frame, door leaf panels, If the door leaf is filled with materials, it should be filled with non-toxic and harmless fire-proof and heat-insulating materials, and equipped with fire-proof hardware accessories with certain fire resistance.

Fire doors are generally located in the following locations.

(1) Enclose the evacuation stairs, leading to the aisle; enclose the elevator room, leading to the front room and the door of the front room leading to the aisle.

(2) Inspection doors for vertical pipeline wells such as cable wells, pipeline wells, flue gas ducts, garbage ducts, etc.

(3) Divide fire compartments, and control the fire walls and doors on fire partitions in the building area of u200bu200bthe compartments.

When it is difficult to install a fire wall or fire door in a building, it should be replaced by a fire shutter door, and at the same time, it must be protected by a water curtain.

Analysis of the main factors affecting the integrity of fire doors

Dimensional tolerance of door leaf and door frame

The shape and position tolerances of the door leaf and the door frame itself, the overlap size of the door leaf and the door frame, the clearance between the door leaf and the door frame, the height difference between the door leaf and the door frame, and other matching tolerances are one of the factors that affect the integrity of fire resistance. If the shape and position tolerance is large, it means that the flatness of the door leaf and the door frame itself is not good. In addition, due to fire deformation, it is easy to burst into flames. If the fit tolerance does not meet the requirements, the overlap size is insufficient, and the gap is too large, it is easy to cause the flame to jump out of the gap directly, resulting in the loss of fire resistance integrity.

Sealing strip

Fire-proof sealing strips are usually set on the door frame-door-leaf butt surface, the overlap between the fire-resistant glass and the door leaf, and the hardware. After the fireproof sealing strip is heated and expanded, it can effectively fill the gaps and prevent heat transfer and fire. If the material of the sealing strip is not good, the width is too narrow, and the setting position is unreasonable, it will affect the actual fire-resistant sealing performance.

When selecting the material, the fire resistance and expansion ratio of the material should be considered. Graphite sealing strips are commonly used. When setting the position and width of the sealing strip, the influence of structural dislocation should be taken into consideration, and it should be set continuously and not disconnected. During the fire resistance test, the sealing strips often fall off due to inadequate installation. Therefore, attention should be paid to the installation. Seal grooves are opened on the frame-fan butt surface, and the sealing strips are embedded in the sealing grooves through gluing, or the sealing strips are embedded in a serrated shape In the trough, the wooden fire door* uses a mechanical connection. During the fire resistance test of fire doors, the sealing strips often come off and carbonized. Therefore, the quality of the fire sealing strips and the installation method are very important.