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正确选择钢结构防火涂料

发布时间:2015-8-28 10:12:04 浏览次数:682




1、 室外不宜使用膨胀型防火涂料。

 
核能、电力、石化及化工等行业的工程应当主要以厚型防火涂料为主。 膨胀型防火涂料起先用于木结构,由于用于室外耐候性差,易老化、起皮,在潮湿、腐蚀环境中膨胀的可靠性问题,以及在高温火焰烧烤发泡过程中,树脂分解产生浓烟和有毒气体等,因此若无特殊措施,在隧道、室外以及经常有人停留的建筑内,不宜使用膨胀型防火涂料。

2、根据建筑部位和耐火极限要求选用防火涂料
 
建筑物中的隐藏钢结构,对涂层的外观质量要求不高,应尽量采用厚型钢结构防火涂料。裸露的钢网架,钢屋架及屋顶承重结构,当规范规定的耐火极限要求在1.5h以下时,可选用薄涂型或超薄型钢结构防火涂料,耐火极限要求超过2.0h时,应选用厚型钢结构防火涂料。
 
3、慎重选用薄涂型钢结构防火涂料,严格控制超薄型钢结构防火涂料的选用。
 
高层建筑钢结构及多层钢结构厂房,不宜使用薄涂型和超薄型钢结构防火涂料。 要从严控制全钢结构建筑,特别是钢柱、钢梁、钢质楼板和钢质疏散楼梯在大型公共民用建筑中的运用。钢柱、钢楼板、钢质疏散楼梯等主要建筑构件应优先选用钢丝网片混凝土等防火保护材料,确实有困难的,可选用厚型钢结构防火涂料保护,慎重选用薄型钢结构防火涂料,严格控制超薄型钢结构防火涂料的选用。
 

 

1, unfavorable use outdoor expansion type fire retardant coatings.

Nuclear energy, electric power, petrochemical and chemical industries such as engineering should be mainly type thick fireproofing coatings. Intumescent fire coatings for wood structure, at first due to poor for outdoor weatherability, easy ageing, peeling, the reliability of the expansion in the humid environment, corrosion problems, and in the process of high temperature flame barbecue foaming, resin decomposition to produce smoke and toxic gases, etc., so without special measures, in tunnel, and people often stay outdoor building, unfavorable use expansion type fire retardant coatings.

2, according to the construction site and fire endurance requirements to choose fireproofing coatings

Hide the steel structure of the building, to the appearance of the coating quality is not high, thick steel structure fire retardant coating should be adopted. Bare steel space frame, steel roof truss and the roof bearing structure, when the fire resistance requirements specification stipulated under 1.5 h, can choose thin coating type or ultra-thin steel structure fire retardant coating, fire endurance required more than 2.0 h, should choose thick steel structure fire retardant coating.

3, carefully choose thin coated steel structure fire retardant coating, strictly control the selection of ultra-thin steel structure fire retardant coating.

High-rise building steel structure and the multi-storey steel structure building, unfavorable use thin coating and ultra-thin steel structure fire retardant coating. To strictly control the whole steel structure, especially steel column, steel beam, steel slab and steel ladders used in large public buildings. Steel columns, steel slab and steel ladders and other major construction should first choose concrete fire protection materials such as steel wire mesh, do have some difficulty, can choose thick steel structure fire retardant coating protection, careful selection of thin steel structure fire retardant coating, strictly control the selection of ultra-thin steel structure fire retardant coating.



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