【 Weak current College 】 fire door quality issues summary

Fire door of quality problems were seen in the following areas:

1. door frame and door leaf material

According to the provisions of the GB12955-2008, fire door with fire-wood for wood or fireproof plate coated composite materials and state-certified authorized testing Agency inspection in accordance with GB8625-2005 meet the standards of Chapter 7, nonflammable.

At present domestic wood fire retardant treatment is generally at a certain temperature, pressure, metal tanks with phosphorus, nitrogen, and other water-based flame retardants for wood immersion, flame retardant penetrating into the wood inside ≥ 5mm and drying, then according to actual dimensions on wood surface planing and fine machining. Supervision, examination and we get a small amount of fire doors in wood with a lighter burn, is common to find that some of the fire doors in wood without flame-retardant treated wood processing or did not meet appropriate depth, this would seriously affect the fire resistance performance of fire door.

Therefore, the resolution should also start, from the source of the fire services product management is not regularly on fire doors production plant for spot checks, with emphasis in the production process and quality control checks. While the engineering acceptance sector should work together with the last post, on unqualified fire door resolutely demolition.

2. fire door filling materials

According to the provisions of the GB12955-2008, fire door filling materials should be innocuous to human fire insulation materials and state-certified authorized testing Agency inspection is gb8624-2005 requirements for combustion performance A1 level requirements and GB/T20285-2006 under the risk classification of smoke toxicity ZA2 level requirements.

Fire door filler materials in fire doors of fire-resistant insulation performance played a major role, thus filling material is fire door engineering inspection and acceptance of key projects. In the light of experience, works supervision and examination rarely appear on fire doors for random checks of breaking, so a number of quality problems.

For example, 2007 年 11 月 13, supervisors in Xinjiang Tarim Branch staff apartment building stairwells, pipe shaft set of class b fire door in discoveries of spot checks, the fire doors in the filler is polystyrene foam board. We all know polystyrene foam board is a thermoplastic polymer material, density is 30kg/m3, the melting temperature of 240 ℃, when the ambient temperature reaches more than 240 ° c, polystyrene foam board melting and flowing, filler parts become a vacuum, fire door main fire insulation properties are lost. For this poor fire door production enterprises subject to legal sanctions.

In addition, the fire doors in the filler and the inspection report does not meet the condition, and with the fill material mostly rock wool, glass plate, etc., greatly reduce fire door of fire-resistant insulation. Therefore, the engineering acceptance of breaking examination is necessary, also recommended that the local fire department and building Committee to establish certain quality supervision and testing equipment, the engineering of fire door quality are effectively protected.

3, fireproof glass

In order to light and beautiful, most of the fire doors are fitted with glass, in accordance with the provisions of the 2008 GB12955-should use the fire door categories (A, B, C class) of fire performance consistent fire resistant glass. With fire-resistant insulation performance of laminated glass fireproof glass is generally, two layers of glass fireproof plastic in the middle is. Fire retardant adhesive by acrylamide in aqueous solution under certain temperature add initiator aggregates into certain molecular weight and acrylamide viscous liquid, solution add other inorganic refractories. This transparent solution poured into a glass sandwich, a certain time after the cross-linking acrylamide formation, the formation of network structure become transparent, thermoset, gel-like substance, the substance formed after the fire-resistant carbon layers of dense, played the role of fire and heat insulation. Therefore, the fire rubber quality directly affects the fireproof glass fireproof performance of products.

Practical engineering applications we found some problems, because the acrylamide raw materials prices more expensive, some manufacturers to reduce the amount of acrylamide, which led to the solution concentration, formation of Colloids in place for a long time to appear along the gap after flowing, Crosslinkers add enough also affects the colloid cross-linking degree. These phenomena will reduce the fire performance of fire-resistant glass, fire smoke easily through broken glass gap, on evacuation produce certain effects. Thus quality control of fire-resistant glass is also a major focus of the inspection.

4, fire seals

According to the provisions of the 2008 GB12955-, fire-proof doors and door leaf and door leaf and door leaf of gaps should be embedded with fire-resistant seals, and state-certified authorized testing Agency inspection, its performance shall conform to the provisions of the GB16807. Fire door in the fire resistance performance testing process, the door is often due to the stresses in the section are not uniform, the role of the high temperature will have a greater gap, smoke was released. Therefore the role of fire seals is in the high temperature of use its fire-resistant insulation (mostly swelling materials) fill the fire door due to high temperatures of the slit. For expansion of fire seals of quality are a few simple identification methods, Visual samples should temper; samples of black granules should 20 or so; use a lighter burn, samples, and expansive performance clearly should not be carbon particles are flying of flocks.

5, normally opened fire doors

Normally closed fire doors, fire doors in General by the door, door closer, seal, double fan or fan changbishi fire doors are equipped with sequencing, normally closed doors do not need to set the electric automatic control, the main door closer, order for closure.

Normally open fire doors, fire doors in General by the door, door closer, weatherstrip, release switch, etc. Automatic control principle is: normally opened fire door by fire door release switch control, usually by the fire control centre control module or FMK controller output DC24V input voltage to the absorption of electromagnetic door fire doors remain open state. When the fire broke out,Smoke and heat detector will detect the signal to the control switches, DC24V power, electromagnetic valve suction release door after power failure, fire door closing through the door closer. Double-door fire doors through control about inertia shut off, at the same time closes the signal back into control cabinets. Normally opened fire door problems mainly lies in the automatic control system to work, at the same time as far as possible, use two induction signal. For example a separate use thermal detectors, fire flue gas temperature is not reached the set temperatures of induction, a lot of smoke through the open doors to the fire escape.

6, fire doors and other hardware accessories

Fire door in essential other metal parts have a door closer, switches, sequencer, fire locks, fire hinge, latch, which fire locks, fire hinge, latch as long as they meet the design requirements, its daily use less, and the door closer, switch sequencer is possible because of the damage caused by improper use. In the check in we often see, some large shopping centres, entertainment venues of normally opened fire door as often switch for normal door use, excessive use of easily door closer, switch the order of the damage, caused the fire door does not close, the impact of the fire door fire insulation smoke, etc.

As the fire door products in construction of a large number of applications, its quality can not be ignored, in future supervision and inspection, fire departments and quality supervision departments should be combined with the new version of fire door product standard, strict implementation of the "building fire codes" and the "high-rise building fire codes" and the associated fire technical specifications, the settings for fire doors and product quality and increase the intensity of inspection and checks so that the initial fire product market towards standardized and rationalized the fire door products in fire occurs truly fireproof insulation smoke effect, guarantee the security of people's lives and property.