Nowadays, the need for steel fire doors on buildings is common, but some problems exist. Do you know how to identify them?

Method/procedure

1, the door gap and the sealing strip problem: because of the individual enterprise products manufactured or quality control is lax in the install link, doors and door leaf interface between seam, box fan seam, door leaf and the seam between the ground and other gap width exceeds bid badly, when checking for wear leakage fire, smoke and can not meet the technical requirements stipulated in the standard. In the gbl2955-1991 steel fire door general technical conditions, 5.3.3 specified that the upper seam must not be greater than 3mm, the side seam should not be greater than 4mm, the middle seam of the double fan shall not be greater than 4mm, and the lower seam shall not be greater than 8mm. In addition, using fire door sealing strip was short of fire prevention requirements, visual sealing strip all materials of small white, with only a little lighter, what is more, just not to install the sealing strip, steel fire door has been affected by the fire smoke insulation function.

2, signal feedback problem: a common practice is the only field engineering installation of door closers and order, not according to the specification requirements of the signal feedback function, the fire door is not perfect. Accurate method should be fire door can be normal open/close usually, in the event of fire through the central fire control room fire alarm system of feedback signals to release, the release switch action, to make the fire door is in a state of closed automatically. The method of inspection is very simple, as long as repeated test of its linkage move to feedback to the fire control center.

3, flameproof glass problems: engineering field often found in float glass (single or double) thin fireproof glass, hollow glass, not enough or daylighting, bubble filthier flameproof glass pretend to be rated high fireproof glass. Randomly check, removed a piece of glass, check of fire retardant liquid filling and sealing the glass on the upper Angle of measuring its thickness, general in 30 mm of class a, class b in 25 mm, class c in 20 mm, specific to the data on the controlled fire glass test report.

4. The thickness of the door fan: the actual door fan used in the engineering field is generally smaller than the door fan in design or detection, and it is difficult to meet the fire resistance level required by the building. Check whether the actual door fan thickness meets the thickness of the door fan in the test report.

5. Raw material problem: the actual raw materials are not consistent with the materials designed or tested. Such as steel sheet instead of thick plate, cold rolled instead of galvanized, fireproof and heat insulation material is not filled, or use the honeycomb board, rock wool instead of aluminum silicate fiber cotton padded or dissatisfaction, shoddy, reduce the production cost. The focus of the inspection for the comparison test report information in the technical requirements, the contents of filler material: tapping the listening test, a kind of method is the voice of a fullness that door frames, door leaf with padding, the stuffy show that filled the reality; Another way is to crack test, that is, from the door frame, door leaf of each hole (the hinge hole, lock, pin hole, door closers, order fixed hole, up and down breather hole, hole, etc.) in the inspection, at present, the market of party a and class b fire door with padding to white aluminum silicate fiber cotton (bulk density, grade a for more than 200 kg/m3, serie b for more than 160 kg/m3), class c with yellow rock wool.

6, automatically shut down problem: the project site is usually installed on the fire door door closers and order, some even only install door closers, the purpose of which is after the fire door is opened automatically shut down. Theoretically do so should be no problem, once the fire consciousness of later generations in the escape is panic, caused by fire door opening dynamics, used in once hard ambassador of the door opening Angle is greater than the Angle of the safe usage of door closers, door closers cannot reset. In this way, fire doors will not function as they should. The most commonly used door closers in the project are 105o and 135o. Check whether the door fan is opened to 135o and whether to install the door retaining device to eliminate the possibility of a closed-door failure.