本文件规定了评定建筑吸声产品吸声性能用的计权吸声系数的计算方法、结果表述以及吸声性能分级。本文件适用于按GB/T 20247测试,用吸声系数作为评价参数的所有建筑吸声产品。本文件不适用于按GB/T 20247测试,用吸声量作为评价参数的分立吸声体,例如座椅、空间吸声体等。本文件规定的计权吸声系数能适用于使用在工厂、办公空间、学校或医院等场所,以吸声降噪为目的的建筑吸声产品吸声性能评定或提出指标要求。但不适用于使用在会堂、音乐厅、剧场等场所,以控制音质为目的的建筑吸声产品吸声性能评定或提出指标要求,在这种情况下,只有给出随频率变化的完整吸声系数数据是合适的。
定价: 38元 / 折扣价: 33 元 加购物车
This standard specifies the terms and definitions, grading, classification and designation, general requirements, requirements, test methods, inspection criteria as well marking, packaging, transportation and storage of spherical bearing for steel building structure (hereinafter referred to as "bearing").
This standard is applicable to spherical bearing for steel building structure,and may also be referred to for other spherical bearings for civil construction
定价: 504元 / 折扣价: 429 元 加购物车
This standard specifies the terms and definitions,classification and labeling,materials,requirements,test methods,inspection rules,product marking,certificate,warranty and operating instruction,packaging,transportation and storage of point supporting device for curtain wall.
This standard is applicable to point supporting device for curtain wall,and the point supporting device for skylight,canopy and guardrail may be implemented by reference.
定价: 612元 / 折扣价: 521 元 加购物车
This standard specifies the terms and definitions,classification and designation,general requirements,technical requirements,test methods,test rules,marking,packaging,transportation and storage of PV shading panel of building.This standard is applicable to shading panel of building with photovoltaic power generating function.
定价: 588元 / 折扣价: 500 元 加购物车