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一、确定消防保卫重点的“四大”标准:火灾危险性大,发生火灾后损失大、伤亡大、影响大的单位和部位.二、建筑物的四个耐火等级:建筑物耐火等级是衡量建筑物耐火程度的标准.可分为一级、二级、三级、四级四个等级.它是以楼板为基准进行划分的,在1—4级耐火等级的建筑物中.楼板的耐火极限应不低于:一级为1.5小时.二级为1.0小时,三级为0.5小时.四级为0.25小时.三、建筑材料按其燃烧性能共分为四级,其燃烧性能分别为:A级,不然性;b_1级,难燃性;B_2级,
First, to determine the focus of the four major fire safety standards: a large fire risk, the occurrence of a large loss of fire, casualties, the impact of large units and parts of two building fire rating: building fire rating is measured The standard of building fire resistance can be divided into four levels of first level, second level, third level and fourth level, which is divided by the floorboards, in the fireproof grade 1-4 buildings, the fire resistance of the floor The limit should not be less than: a 1.5 hours, two 1.0 hours, three 0.5 hours, four 0.25 hours. Third, the building materials are divided into four levels according to their burning properties, the combustion properties were: Class A, or sexual; b_1 level, flame retardancy; Class B_2,