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1985年国内研制成功了几种提高建筑构件耐火极限的新型防火隔热涂料,这是广大建筑设计人员和消防工作者多年来一直盼望的科技成果。一、建筑构件耐火极限是划分建筑物耐火等级的基础数据各种建筑物由墙、柱、梁、楼板、屋面板、吊顶等建筑构件组成、各种建筑构件的燃烧性能和耐火极限决定了建筑物的耐火等级。现行《建筑设计防火规范》规定建筑物的耐火等级划分为四级:一级耐火等级的建筑物,系组成建筑物的各种构件均为非燃烧体,其最低耐火极限,如梁为2小时,楼板为1.50小时,吊顶(包括搁栅)为0.25小时,
In 1985, several new types of fire-retardant coatings were developed in China to improve the fire-resistance limit of building components. This is a scientific and technological achievement that many architectural designers and fire-fighting workers have been looking forward to for years. 1. The fire resistance limit of building components is the basic data for classifying the fire-resistance grades of buildings. The various buildings consist of building elements such as walls, columns, beams, floors, roof panels, ceilings, etc. The combustion performance and fire-resistance limits of various building components determine the construction. The fire rating of the object. The current “Code for the Fire Protection of Building Designs” stipulates that the fire resistance rating of a building is divided into four levels: buildings of Class I fire resistance, and the various components that make up the building are non-combustion bodies, with the lowest fire resistance limit, such as 2 hours for beams. The floor is 1.50 hours, and the ceiling (including joists) is 0.25 hours.