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我国古建筑绝大多数以木材为主要材料,以木构架为主要结构形式,多采用松、柏、杉、楠等,其耐火等级低。古建筑中的各种木材构件,具有特别良好的燃烧和传播火焰的条件。古建筑起火后,犹如架满了干柴的炉膛,而屋顶严实紧密,在发生火灾时,屋顶内部的烟热不易散发,温度容易积聚,迅速导致“轰燃”。古建筑的梁、柱、椽等构件,表面积大,木材的裂缝和拼接的缝隙多,再加
The vast majority of ancient buildings in our country as the main material of wood to wood structure as the main structure, the use of pine, cypress, fir, Nan, etc., its low fire rating. All kinds of wood components in ancient buildings have a particularly good condition for burning and spreading fire. After the fire broke out in the ancient building, it was like a hearth filled with dried firewood, and the roof was tight. In the event of a fire, the smoke and heat within the roof were not easily dissipated and the temperature easily accumulated, rapidly causing “flash fire.” Ancient buildings beams, columns, rafters and other components, large surface area, cracks and splicing cracks in the wood, plus