关于GB 51251—2017在各个地区执行差异的探讨
Discussion on implementation difference of GB 51251-2017 in various regions
摘要：
GB 51251—2017《建筑防烟排烟系统技术标准》中的防排烟设计基本方法与以往有较大改变，技术要求有较大提高。各省市对于GB 51251—2017的理解有所差异，并提出了不同的防排烟技术标准解读文件。对比各地对于GB 51251—2017的解释文件，笔者发现各地对侧排烟口下方排烟层厚度的取值标准各不相同，对于单个排烟口最大允许排烟量的计算原则亦有不同讨论。此外，GB 51251—2017对于自然排烟系统的补风要求、首层扩大前室防烟措施、防烟楼梯间及前室的压力控制措施亦缺少可实施的规定。本文针对上述几方面问题进行了讨论，并提出了相应的建议。
Abstract：
The basic methods of smoke prevention design in GB 51251-2017 Technical standard for smoke management systems in buildings have been greatly changed and the technical requirements have been greatly improved. Different provinces and cities have different understandings of GB 51251-2017, and different interpretation documents of this technical standard have been proposed. Comparing the interpretation documents of GB 51251-2017 in various regions, the author finds that the standards for the thickness value of the smoke exhaust layer under the opposite smoke outlet are different in different regions, and the calculation principles of the maximum allowable smoke exhaust volume of a single smoke outlet are also different. In addition, GB 51251-2017 also lacks implementable regulations for the supplementary air requirements of natural smoke exhaust systems, the smoke prevention measures for the enlarged anteroom on the first floor, and the pressure control measures in the smoke stairwell and the anteroom. This paper discusses the above issues and puts forward corresponding suggestions.
Keywords:buildingsmokepreventionandsmokeexhaust;designstandard;comparativeanalysis;maximumallowablesmokeexhaustvolumeofasinglesmokeoutlet;enlargedanteroomonfirstfloor;pressurecontrol