楼梯是楼层建筑垂直交通工具,是安全疏散的重要通道。根据防火要求,可将楼梯间分为开楼梯间、封闭楼敞梯间、防烟楼梯间和室外楼梯间四种形式。一、开楼梯间敞敞开楼梯间是指建筑物内由墙体等围护构件构成的无封闭防烟功能,且与其他使用空间相通的楼梯间。敞开楼梯间在低层建筑中广泛采用。由于楼梯间与走道之间无任 Staircase is a vertical transport floor construction, an important channel for safe evacuation. According to the requirements of fire prevention, the staircases can be divided into four forms: open stairwell, closed staircase, smoke stairwell and outdoor stairwell. First, the open stairwell Open stairwell refers to the building by the wall and other enclosures to prevent the composition of the non-smoking features, and with other use of the same stairwell. Open stairwell is widely used in low-rise buildings. Because there is no room between stairwell and walkway