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    防火卷簾門在具體運用中的發展趨勢轉變

    時間:2019-09-29

    防火卷簾門在在消防門中運用較為普遍的這種電動卷簾門,由片式防火卷簾門發展趨勢為雙片復合性,及雙軌制雙簾無機物布型,以便融入更強的防火安全規定各大防火門窗生產商都是在持續科學研究和探尋之中。

    Fire-proof roll-curtain doors are widely used in fire doors. The development trend of electric roll-curtain doors is from sheet-type fire-proof roll-curtain doors to double-sheet composite and double-track double-curtain inorganic fabric, so as to integrate into stronger fire safety regulations. Major fire-proof doors and windows manufacturers are in the process of continuous scientific research and exploration.

    初期的鋼制防火卷簾門是雙板式的,其簾面通常是用0.5~1.5mm厚的冷軋鋼板經裁剪冷軋成的帶條狀簾片接雙而成。雙板式鋼制防火卷簾門簾面具備構造簡易、抗壓強度高、抗氣壓、防盜、塑性好、加工、安裝、使用都比較方便等優點,但耐火性能和隔熱性能卻很差。耐火性能差是因為在高溫下鋼材強力下降。比如普通低碳鋼溫度超過350℃,強力開始迅速下降,在500℃時其強力約為常溫的1/2,600℃時強力約為常溫的1/3。除此之外,不銹鋼板材在必須溫度和地應力下,隨時間流逝,會產生塑性形變。不銹鋼板材在超低溫下就會產生徐變,在高溫下徐變顯著。如一般高碳鋼通常在300~350℃、碳素鋼在400~450℃時徐變顯著,易造成形變,減少了防火安全特性。鋼材隔熱性能差是因為鋼是熱的良導體,導熱系數大。根據燃燒理論和熱學原理,燃燒、傳熱和溫升是互相聯系、互相作用、不可分割的物理現象。因為雙板式鋼制防火卷簾門簾面耐火性能差,當火災事故產生時,房屋建筑內一瞬間造成的極大發熱量從受火面根據導熱、輻射熱、對流傳熱等方法很多地傳送到背火面,從而使背火面溫度急劇上升。當背火面溫度升至一些可燃物的燃點時,防火卷簾的防火性能就大大降低乃至喪失了。

    In the early stage, the steel fire-proof rolling shutter door was double-plate type, and its curtain surface was usually made of 0.5-1.5mm thick cold-rolled steel sheet cut and cold-rolled strip curtain. Double-plate steel fire-proof rolling curtain door mask has the advantages of simple structure, high compressive strength, air pressure resistance, anti-theft, good plasticity, easy processing, installation and use, but its fire resistance and heat insulation performance are poor. The poor fire resistance is due to the decrease in strength of steel at high temperatures. For example, the strength of ordinary low carbon steel begins to decrease rapidly when the temperature exceeds 350 C. The strength is about 1/2 of normal temperature at 500 C and 1/3 of normal temperature at 600 C. In addition, the stainless steel sheet will produce plastic deformation with the passage of time under the necessary temperature and in-situ stress. The stainless steel sheet will produce creep at ultra-low temperature, which is significant at high temperature. For example, the creep of high carbon steel is obvious at 300-350 (?) and 400-450 (?) C, which can easily cause deformation and reduce the fire safety characteristics. The poor thermal insulation performance of steel is due to the fact that steel is a good conductor of heat and has a high thermal conductivity. According to combustion theory and thermal principle, combustion, heat transfer and temperature rise are interrelated, interacting and inseparable physical phenomena. Because the fireproof performance of double-plate steel fire-proof roll curtain door curtain is poor, when a fire accident occurs, the maximum heat generated in a moment in the building is transferred from the fire surface to the back surface according to heat conduction, radiation, convective heat and other methods, so that the temperature of the back surface rises sharply. When the back fire temperature rises to the ignition point of some combustibles, the fire resistance of the fire-proof roll curtain will be greatly reduced or even lost.

    中后期復合性鋼制防火卷簾門是現階段中國應用較多的防火卷簾門。與雙板式鋼制防火卷簾門對比,因為構造的改善,使之除保存雙板式鋼制防火卷簾門的優勢外,耐火性能也是明顯增強。從簾面結構上講,復合型鋼質防火卷簾簾面是由兩層薄鋼帶中間夾一層無機纖維隔熱材料組成的復合夾芯簾片串接而成。目前各廠家使用的無機纖維隔熱材料主要有巖棉、礦棉、玻璃棉或硅酸鋁纖維等。由于無機纖維導熱系數小,因此復合型鋼質防火卷簾隔熱性能比單板鋼質防火卷簾有較大提高。然而,從表1可以看出:對于巖棉、礦棉和玻璃棉纖維,其最高使用溫度均低于國際標準升溫曲線1小時的924℃。假如不考慮鋼板本身的隔熱作用,理論上除非有足夠的厚度,否則這三種材料根本不能滿足《高規》中關于防火卷簾耐火極限≥3小時的標準。事實上,由于受復合型鋼質卷簾簾片結構的限制,我國目前市場上復合型鋼質防火卷簾無機纖維層一般不超過20mm且不是連續層,這個厚度遠遠不能保證防火卷簾耐火極限≥3小時而背火面溫升又不≥140℃。對于硅酸鋁纖維,雖然耐高溫達到1200℃以上,但≤20mm的單層厚度也遠遠不能滿足耐火極限≥3小時的條件。所以說復合型鋼質防火卷簾雖然比單板式鋼質防火卷簾防火隔熱性能有明顯改善,但仍不能克服單板式鋼質防火卷簾的主要缺陷,無法滿足《高規》新標準的要求。

    Composite steel fire-proof roll-curtain doors are widely used in China at present. Compared with double-plate steel fire-proof roll-curtain doors, the improved structure not only preserves the advantages of double-plate steel fire-proof roll-curtain doors, but also significantly improves the fire resistance. In terms of curtain structure, the composite steel fire-proof roll curtain is composed of two thin steel strips and a layer of inorganic fiber insulation material. At present, the inorganic fiber insulation materials used by various manufacturers mainly include rock wool, mineral wool, glass wool or aluminium silicate fibers. Because of the small thermal conductivity of inorganic fibers, the thermal insulation performance of composite steel fire-proof roll curtain is better than that of single-board steel fire-proof roll curtain. However, as can be seen from table 1, the maximum temperature of rock wool, mineral wool and glass wool fibers is lower than 924 C of the international standard temperature curve for one hour. If the thermal insulation of the steel plate is not considered, theoretically, unless there is enough thickness, the three materials can not meet the fire resistance limit of the fire-proof roll curtain (> 3 hours) in the High Regulations. In fact, due to the restriction of composite steel curtain structure, the inorganic fiber layer of composite steel fireproof curtain is not more than 20 mm and is not a continuous layer. This thickness can not guarantee the fireproof limit of fireproof curtain (> 3 hours) and the temperature rise of backfire surface (> 140 C). For aluminium silicate fibers, the single layer thickness (<20mm) can="" not="" meet="" the="" condition="" of="" fire="" resistance="" limit="">3 hours), although the high temperature resistance is above 1200 C. Therefore, although the performance of composite steel fire-proof roll curtain is obviously improved than that of single-plate steel fire-proof roll curtain, it still can not overcome the main defects of single-plate steel fire-proof roll curtain and can not meet the requirements of the new standard of "High Regulations".

    現階段特等無機物布雙軌制雙簾防火卷簾門因其簾體很輕,碰到高溫的那時候不形變,在耐火等級、噪音、熱輻射、大洞邊等多選指標值優勢比較明顯,表層耐腐蝕浸蝕,使用期更長;等自己獨有的特點,克服了上鋼質防火卷簾門的缺點得到了廣泛應用。泛應用。

    At the present stage, the special inorganic double-track fire-proof roll-curtain door with double curtain is light and does not deform when it meets high temperature. It has obvious advantages in fire-resistant grade, noise, thermal radiation, large hole edge and other selected index values. The surface is corrosion-resistant and corrosion-resistant, and its service life is longer. Its unique characteristics overcome the steel fire-proof roll. The drawbacks of curtain doors have been widely used. Extensive application.

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