《建筑设计防火规范》GB-解读最终版

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总则.........................................................................................................................................................1术语、符号.................................................................................................................................................22.1术语..................................................................................................................................................22.2符号..................................................................................................................................................4厂房和仓库.................................................................................................................................................53.1火灾危险性分类...............................................................................................................................53.2厂房和仓库的耐火等级...................................................................................................................73.3厂房或仓库的层数、面积和平面布置...........................................................................................93.4厂房的防火间距.............................................................................................................................13快3.5鼓仓库的防火间袖距防......掀......痛......牺......卸......辱......直......偏......放......自......晓......奥......症......菌......祝......骗......帽......怒......魔......生......萍.....1绪7凤3.6两厂房和仓库的朴防爆留......疮......容......败......载......沉......绿......予......液......跃......泽......东......被......稳......朝......言......库......杯......那......征......调.19嫂3.7姑厂房的安全疏属散途......纳......拘......保......通......气......咏......泽......坛......润......弦......傻......蛇......求......不......骆......智......串......催......援......涉.....2反1改3.8震仓库的安全疏典散桨......枕......名......午......哄......贫......饼......蓝......预......痰......叙......颂......宋......尘......尘......举......悄......枝......寸......湾......皮.....2恰2弃甲、乙、丙类顷液体、气体储风罐（区）和可溪燃材料堆场元......脱......梅......崖......长......奔......锐......话......淹......摔......脑......蝴......品24鼓4.1伤一般规定御.....鄙......刻......克......墙......辆......搬......常......锯......敢......殿......胖......财......锈......年......舞......鹅......资......灌......团......搞......棕......裳.....2急4返4.2街甲、乙、丙类汇液体储罐（区骤）的防火间距靠......茅......挤......会......挂......吉......心......痛......穗......捐......岸......硬......伙......毅...24开4.3贵可燃、助燃气切体储罐（区）良的防火间距梅......摩......月......召......凤......封......非......父......者......强......慢......锁......洒......仪......于.27把4.4伤液化石油气储拆罐（区）的防节火间距街......贿......晋......耳......愿......添......音......私......笨......拣......棚......茶......降......循......获......统...31再4.5倦可燃材料堆场王的防火间距目......袜......决......接......秃......电......蚀......管......片......惯......观......昏......巾......与......周......病......逆......什......凳.33爪民用建筑法.....牌......咽......剑......贸......膀......葛......拼......午......闯......文......阀......旦......岗......睬......薄......般......团......挺......洗......管......疯......铃......美......末....35恋5.1痕建筑分类和耐土火等级低......为......古......共......户......撞......映......旦......龄......友......寸......篮......等......唉......迈......吴......浅......疾......弊......拉...35际5.2知总平面布局全......朱......勿......误......坐......烧......毫......猪......投......胖......阁......进......键......召......敞......斤......结......倘......萍......呆......桨......翁......魔.37刺5.3嫁防火分区和层诵数弦......返......收......弹......励......黎......诚......访......誓......塑......氧......葛......唐......沃......原......化......当......维......波......彼......柄.....3避9代5.4过平面布置布.....旋......愤......扛......挺......雹......两......值......窝......燕......车......饿......次......仰......崖......嫩......希......咸......强......桥......池......盗......秩.....4拥1递5.5易安全疏散和避厦难麦......招......辰......牙......妈......瞎......卖......规......喷......匙......浅......努......洪......垮......古......哄......静......绒......见......众......波.....4榜6键建筑构造葡.....共......布......活......扰......洽......垮......破......耕......跃......我......则......殿......册......欠......鲜......重......心......容......路......骨......坊......砍......捧......忙....56借6.1琴防火墙洁.....葬......欠......欠......旷......余......碑......远......转......羞......流......瞒......缓......川......严......佳......朋......筑......舰......累......琴......酱......仍......洲...56酬6.2腥建筑构件和管棕道井疼......笨......聋......五......棒......迹......弟......陕......坑......馆......向......俱......卧......峰......拴......构......贼......流......型......脾......转.56瓶6.3虾屋顶、闷顶和闯建筑缝隙五......环......软......浅......剧......徐......敏......槽......燥......冻......他......三......帖......余......骨......渣......洗......蒙......戒.....5垃8屿6.4朴疏散楼梯间和馆疏散楼梯等赌......肾......搬......搁......摧......虾......郊......苦......捐......瘦......统......磨......月......港......惨......邻......浊......黎......窗.59迫6.5户防火门、窗和犁防火卷帘边......醋......洪......奖......抓......迟......损......习......耗......絮......排......酬......削......忧......纲......太......炒......末......栽.....6识2栏6.6滑天桥、栈桥和咬管沟腿......甘......他......著......盖......铸......轮......级......艘......诸......菊......哀......渗......所......陷......树......恐......复......设......芽......朋.641松6.7撇建筑保温和外坡墙装饰公......务......张......军......凡......甜......傲......渡......壮......验......许......连......春......之......落......犹......慌......症......是......构..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炒城市交通隧道版.....短......秀......稀......愁......膨......倡......尘......兄......适......至......冤......是......喂......朽......元......偷......矩......灯......氧......迹......垄......列......邻90前12.1觉一般规定翅.....田......蚀......喷......黄......励......抢......碎......棒......恰......垒......锡......急......察......盲......短......皮......依......妇......助......佛......吸......析...90甲12.2格消防给水和灭级火设施辨......她......肚......诸......探......寄......鲁......趴......却......见......条......孕......嘴......其......广......翁......丈......妥......杏......绿.91淋12.3资通风和排烟系混统彻......挺......缝......并......魄......搜......赔......隔......光......毒......第......悉......结......财......愈......耽......丝......刃......逐......飞......阵...92窝12.4铅火灾自动报警朋系统绩......泉......虹......乡......芽......夜......坛......颤......贝......穗......可......肉......亦......拥......骆......服......策......瑞......议......滴.....9怜3嘴12.5腐供电及其他盗......牌......期......蹦......何......京......仿......肌......挠......气......览......决......峰......瑞......征......荡......傅......师......诊......喷......卵......俗.....9禁3箩附录匹A鱼建筑高度和建汗筑层数的计算氧方法俱.....板......水......木......趁......边......玩......燥......妥......取......不......缴......邪......余......旷......赤......怨...95底附录认B亚防火间距的计勿算方法妈.....摄......挨......碌......歼......污......盐......箩......棕......释......刺......替......介......打......值......朽......钓......述......忍......莫.....9忙6搅附录屋C撒隧道内承重结观构体的耐火极甜限试验升温曲滥线倚.....喘......稿......袖......尤......索......缩......穿......昼......麦......伟......浪......壳......乖.97芽和相应的判定殿标准煤.....阴......置......蛙......走......愉......撇......篇......辟......嚷......翠......吹......茫......轨......悉......齐......策......担......季......驻......越......尼......坚......趣97灾本规范用词说寇明蹲.....俯......蓬......唯......批......腹......槐......款......猛......杠......惰......斜......腰......奶......朽......茶......闷......耻......汉......灌......轨......继......吩......封....98析引用标准名录皮.....甘......擦......于......江......左......晴......督......怎......糊......照......少......领......仁......页......甘......遮......寿......禁......址......币......正......赠......杯......让..992菊CONTEN小TS讨1Gene捧ralpr她ovisio惨ns...刮......淹......枕......蒜......达......欲......致......仰......辟......亮......区......漠......叫......肤......纳......助......籍......晚......股......教......胶......莲......亭123

如Terms昏andsy哑mbols番......印......剥......爪......数......棉......穴......悟......狼......内......马......海......带......持......贤......萌......众......进......啄......震......障......些......讨..2糊2.1Te身rms...叫......跃......舒......纠......丙......吓......鸽......险......痛......蓬......萝......彼......驻......炎......触......解......晃......累......咳......错......抚......握......贤......帆....2册2.2Sy客mbols谣......灯......纪......浅......陶......钉......粒......早......询......撒......遵......结......尖......歌......堡......丑......胆......耕......织......洁......久......珍......高......妖..3桑Factor戚ybuil亚dings亦andst血orages泳......摧......币......逢......鄙......督......颠......呢......锦......自......石......亦......聚......撤......职......料......其......号......拔......抬...5赔3.1Cl忘assifi爬cation伴offi利rehaz睬ards..雄......料......异......严......创......猫......孟......围......汇......驻......鸦......殊......带......饥......骆......破......湖......潜.....53.23.33.43.5

舰Firer零esista膊ncecl怪assof捏facto息rybui业ldings些ands国torage摊s....球......浩......贫......讲......回......瘦......存......瘦......尘......损......测...7信Storie茎s,occ宵upied驱areaa首ndpla尤nearr雁angeme昼ntof配factor怕ybuil挺dings秃andst胁orages疮.....址......排......鄙......慎......挥9维Fires怪eparat需iondi吧stance肠offac展toryb叫uildin齐gs...学......带......编......掏......串......铲......补......窜......版......秒......占......仁......忆......题..13婚Fires巾eparat绢iondi块stance凭ofst纳orages径.....装......油......振......暮......姓......甲......截......责......费......拥......栽......忍......仗......歼......熊......旗.17握3.6Ex辣plosio份nprev醒ention狂offa巧ctory炊buildi慨ngsan犯dstor寺ages.论......另......怜......泻......午......蒜......慧......氧......匠......夹......泰....193.7

卖Safee祥vacuat侵ionof况facto梦rybui爬ldings靠......朵......醋......娘......关......魄......叼......讲......祖......翠......腾......粥......继......造......信......天.....2博1慕3.8Sa设feeva写cuatio煎nofs雹torage皆s.....同......及......役......蠢......衰......对......遇......霜......龙......将......别......兰......助......膨......繁......纲......某......船..224

如Class鼓A,B,赶Cliqu漏idand括gast聋anks蔽（蓝tankf乖arm份）葡ands域tackya立rdfor狂combu浪stible背s....殊......奉......粮......茧......伪....24愧4.1Ge勤neral帮requir梅ement.甜......话......乏......悦......暂......轮......类......鲁......府......乱......债......挖......跑......日......西......推......加......稿......浓......滋.....2置44.24.34.4

嫁Fires份eparat李iondi阿stance辰ofCl美assA,惠B,C咽liquid贤tanks昂（笋tankf汪arm笨）画......津......蝶......陕......博......极......朱......满.24矩Fires例eparat役iondi漠stance烂ofco贡mbusti执blean描dcomb闸ustion并-suppo钞rting奏gasta闻nks这（涂tankf肯arm肥）日....2醒7辟Fires尸eparat桑iondi搂stance视ofLP疏Gtank刑s算（敲tankf梳arm观）忽.....趴......粮......住......刘......玻......鞭......嘉......恰......排......榴......且..31凡4.5Fi觉resep作aratio闪ndist折anceo咐fstac虹kyard便forco宋mbusti鞭bles.田......渠......敲......融......拿......利......佛......苏......继......贡......立.....3苍35

徒Civil衰Buildi察ng...秧......柿......咸......律......含......口......慕......巡......奉......梅......毒......故......久......末......筒......晃......登......文......泥......完......论......藏......阶.....3掌5凶5.1Cl椒assifi孔cation惰andf澡irere刃sistan疑cecla茂ss...扩......损......粥......赠......气......械......飞......纳......抓......购......谜......逝......架......巴......物...35梳5.2Ge价neral寨layout全.....候......绢......朽......丽......拳......纲......来......介......裂......掏......硬......浸......吼......供......盖......范......盆......狂......财......兴......凡....375.3

沙Firec柜ompart愈menta丑ndsto坦ries.硬......顶......疗......衡......崇......乎......侵......肿......扁......么......核......泰......跌......黎......较......烂......过......所...39类5.4Pl除anear短rangem鼓ent...信......葬......鸟......壳......蓝......究......董......运......欢......芒......恐......白......员......属......妹......讨......豪......晌......柜......唱......菌41扁5.6Sa古feeva揉cuatio桥nand度refuge泥.....死......辆......核......虽......恋......收......舰......毁......寒......谦......介......锈......半......倦......径......君......废......则..466

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渗Firew录all..勉......医......栋......煮......摆......老......窗......藏......士......尺......骨......卫......坐......件......签......谋......择......欣......翠......中......净......符......蛛....55刮6.2Bu张ilding柴eleme密ntsan得dshaf战ts...莫......佩......所......单......有......悼......待......考......螺......牧......众......足......喝......童......浩......袭......怪......追.55臂6.3Ro白of,bl骂indce锣iling术andjo式ints.嫂......王......呼......尺......市......胸......德......挎......泛......衡......弄......统......鹿......编......章......恢......童......缠...576.46.5

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脉为了预防建筑立火灾，减少火壮灾危害，保护蹈人身和财产安庭全，制定本规附范。攻本规范适用于视下列新建、扩里建和改建的建泼筑：厂房；仓库；民用建筑；白甲、乙、丙类僚液体储罐（区饰）；老可燃、助燃气真体储罐（区）轨；任可燃材料堆场沉；削城市交通隧道资。蜜人民防空工程间、石油和天然夜气工程、石油货化工工程和火离力发电厂与变懂电站等的建坟筑防火设计，口当有专门的国节家标准时，宜成从其规定。

殖本规范不适用草于火药、炸药符及其制品厂房率（仓库）、花罢炮厂房（仓库键）的建筑防火设计。

就同一建筑内设家置多种使用功叨能场所时，不姐同使用功能场隙所之间应进行耍防火分揉隔，该建筑及没其各功能场所号的防火设计应愿根据本规范的窜相关规定确定歌。

队建筑防火设计漠应遵循国家的唤有关方针政策梁，针对建筑及涂其火灾特点，社从全局出破发，统筹兼顾尖，做到安全适袖用、技术先进呀、经济合理。

林建筑高度大于阶250m辰的建筑，除应刺符合本规范的佳要求外，尚应价结合实际情况痰采挺取更加严格的悄防火措施，其掌防火设计应提基交国家消防主依管部门组织专兴题研究、论证雁。

洲建筑防火设计船除应符合本规师范的规定外，税尚应符合国家姨现行有关标准痕的规定。1妈2趴术语、符号2.1术语

哑高层建筑旺high-期riseb败uildin浩g题建筑高度大于暗27m料的住宅建筑和惠建筑高度大于竖24m理的非单层厂房啄、仓库和其他疗民用建筑。偷注：建筑高度翅的计算应符合担本规范附录符A返的规定。

裙房

podium壤在高层建筑主盾体投影范围外另，与建筑主体境相连且建筑高韵度不大于西24m剑的附属建筑。

重要公共建筑

头import串antpu奔blicb龄uildin阻g口发生火灾可能脉造成重大人员菊伤亡、财产损孕失和严重社会钳影响的公共建骡筑。

商业服务网点

订commer悉cialf愁acilit盏ies皆设置在住宅建拜筑的首层或首棍层及二层，每同个分隔单元建誉筑面积不大于嫁300m狭2叮的商寸店、邮政所、院储蓄所、理发种店等小型营业慨性用房。

高架仓库

劲highr奋ackst巨orage注货架高度大于企7m昂且采用机械化免操作或自动化床控制的货架仓断库。

半地下室

图semi-b线asemen罗t啦房间地面低于寇室外设计地面患的平均高度大隆于该房间平均低净高婶1/3长，且不大于裙1/2者。

地下室

巷baseme瓣nt傲房间地面低于扰室外设计地面昌的平均高度大闯于该房间平均万净高贫1/2欠者。

明火地点

除openf敢lamel剑ocatio炊n猜室内外有外露堤火焰或赤热表贫面的固定地点搜（民用建筑内热的灶具、电磁寨炉等除外）。

散发火花地点

怒sparki类ngsit初e礼有飞火的烟囱允或进行室外砂室轮、电焊、气旦焊、气割等作偷业的固定地点兼。

耐火极限

权firer唯esista芬ncera扎ting蝇在标准耐火试补验条件下，建晋筑构件、配件川或结构从受到絮火的作用时起兽，至失去承虫载能力、完整榴性或隔热性时印止所用时间，鹿用小时表示。

防火隔墙

通firep勤artiti小onwal具l燥建筑内防止火遣灾蔓延至相邻糟区域且耐火极砌限不低于规定誉要求的不燃性答墙体。2

次防火墙柄fire激wall员防止火灾蔓延老至相邻建筑或耍相邻水平防火妖分区且耐火极苹限不低于黑3.00h挎的不燃性墙体。

避难层（间）

义refuge的floor营（逗room忙）厘建筑内用于人畏员暂时躲避火爆灾及其烟气危敲害的楼层（房悬间）。

安全出口

饿safety瓦exit沫供人员安全疏想散用的楼梯间资和室外楼梯的妈出入口或直通所室内外安全区所域的出口。

封闭楼梯间

羞enclos休edsta脸ircase弟在楼梯间入口吸处设置门，以偏防止火灾的烟肯和热气进入的水楼梯间。

防烟楼梯间

膝smoke-董proof振stairc谁ase趁在楼梯间入口墨处设置防烟的祥前室、开敞式嘴阳台或凹廊（肚统称前室）等倚设施，且通背向前室和楼梯醒间的门均为防记火门，以防止宴火灾的烟和热骂气进入的楼梯玩间。

斩避难走道踩exit学passag急eway着采取防烟措施滚且两侧设置耐临火极限不低于仿3.00h歼的防火隔墙，蛛用于人员安全卡通行圆至室外的走道熟。

闪点

辰flash刚point抢在规定的试验帖条件下，可燃午性液体或固体猎表面产生的蒸芳气与空气形成醒的混合犁物，遇火源能家够闪燃的液体琴或固体的最低疏温度（采用闭狠杯法测定）。

爆炸下限

命lower坡explos奏ionli隶mit熔可燃的蒸气、差气体或粉尘与冲空气组成的混汗合物，遇火源倚即能发生爆炸混的最低浓度。

沸溢性油品

违boil-o喝veroi款l透含水并在燃烧若时可产生热波零作用的油品。

防火间距

千fires浇eparat第iondi段stance膏防止着火建筑帐在一定时间内刺引燃相邻建筑炮，便于消防扑锋救的间隔距离双。设注：防火间距载的计算方法应亏符合本规范附听录造B厉的规定。

防火分区

质firec罗ompart著ment朝在建筑内部采考用防火墙、楼乒板及其他防火失分隔设施分隔愤而成，能在一铺定时间内形防止火灾向同改一建筑的其余脆部分蔓延的局始部空间。

防烟分区

众smoke疤compar姓tment涉在建筑内部采材用挡烟设施分权隔而成，能在子一定时间内防罢止火灾烟气向互同一建筑3障的其余部分蔓笑延的局部空间涉。

充实水柱

策fullw机aters瞧pout絮从水枪喷嘴起辽至射流埋90%知的水柱水量穿闻过直径鼻380mm挽圆孔处的一段袄射流长度。2.2符号敬A类——怎泄压面积C——泄压比泳D绕——泊储罐的直径百D苍N交——恋管道的公称直严径耻Δ誉H泽——猴建筑高差箱L挎——霞隧道的封闭段粉长度N——人数n——座位数绸K崇——见爆炸特征指数纤V壶——奔建筑物、堆场靠的体积，储罐魂、瓶组的容积源或容量陷W规——座可燃材料堆场旗或粮食筒仓、它席穴囤、土圆鬼仓的储量4食3捧厂房和仓库起3.1缺火灾危险性分装类

搏生产的火灾危继险性应根据生珍产中使用或产刃生的物质性质刷及其数量等因禽素划分，籍可分为甲、乙竞、丙、丁、戊郑类，并应符合附表的规定。表

浓生产的火灾危辛险性分类

翁同一座厂房或猜厂房的任一防夺火分区内有不轧同火灾危险性乘生产时，厂房魄或防火分石区内的生产火压灾危险性类别艺应按火灾危险湿性较大的部分坝确定；当生产甚过程中使用或貌产5生产的火灾生产的火灾危险性类别使用或产生下列物质生产的火灾危险性特征甲1．闪点小于28℃的液体2．爆炸下限小于10%的气体3．常温下能自行分解或在空气中氧化能导致迅速自燃或爆炸的物质4．常温下受到水或空气中水蒸气的作用，能产生可燃气体并引起燃烧或爆炸的物质5．遇酸、受热、撞击、摩擦、催化以及遇有机物或硫磺等易燃的无机物，极易引起燃烧或爆炸的强氧化剂6．受撞击、摩擦或与氧化剂、有机物接触时能引起燃烧或爆炸的物质7．在密闭设备内操作温度不小于物质本身自燃点的生产乙1．闪点不小于28℃，但小于60℃的液体2．爆炸下限不小于10%的气体3．不属于甲类的氧化剂4．不属于甲类的易燃固体5．助燃气体6．能与空气形成爆炸性混合物的浮游状态的粉尘、纤维、闪点不小于60℃的液体雾滴丙1．闪点不小于60℃的液体2．可燃固体丁1．对不燃烧物质进行加工，并在高温或熔化状态下经常产生强辐射热、火花或火焰的生产2．利用气体、液体、固体作为燃料或将气体、液体进行燃烧作其他用的各种生产3．常温下使用或加工难燃烧物质的生产戊常温下使用或加工不燃烧物质的生产御生易燃、可燃丙物的量较少，块不足以构成爆着炸或火灾危险胞时，可按实际修情况确定；当良符秘合下述条件之轨一时，可按火督灾危险性较小的的部分确定：1

歉火灾危险性较骡大的生产部分流占本层或本防魔火分区建筑面抗积的比例小于幸5%菠或飘丁、戊类厂房恒内的油漆工段盯小于木10%巾，且发生火灾载事故时不足以坟蔓延至其他部寿位或果火灾危险性较件大的生产部分源采取了有效的置防火措施；2

味丁、戊类厂房贫内的油漆工段帜，当采用封闭催喷漆工艺，封净闭喷漆空间内臂保持负尺压、油漆工段任设置可燃气体歪探测报警系统管或自动抑爆系视统，且油漆工宰段占所在防火喊分单区建筑面积的拴比例不大于歪20%眨。

街储存物品的火满灾危险性应根角据储存物品的量性质和储存物疑品中的可燃物油数量等希因素划分，可眨分为甲、乙、沙丙、丁、戊类律，并应符合表誓的规定。表

删储存物品的火妈灾危险性分类

贡同一座仓库或屿仓库的任一防弯火分区内储存攻不同火灾危险蜻性物品时，仓访库或防6储存物品的火储存物品的火灾危险性类别储存物品的火灾危险性特征甲1．闪点小于28℃的液体2．爆炸下限小于10%的气体，受到水或空气中水蒸气的作用能产生爆炸下限小于10%气体的固体物质3．常温下能自行分解或在空气中氧化能导致迅速自燃或爆炸的物质4．常温下受到水或空气中水蒸汽的作用，能产生可燃气体并引起燃烧或爆炸的物质5．遇酸、受热、撞击、摩擦以及遇有机物或硫磺等易燃的无机物，极易引起燃烧或爆炸的强氧化剂6．受撞击、摩擦或与氧化剂、有机物接触时能引起燃烧或爆炸的物质乙1．闪点不小于28℃，但小于60℃的液体2．爆炸下限不小于10%的气体3．不属于甲类的氧化剂4．不属于甲类的易燃固体5．助燃气体6．常温下与空气接触能缓慢氧化，积热不散引起自燃的物品丙1．闪点不小于60℃的液体2．可燃固体丁难燃烧物品戊不燃烧物品旅火分区的火灾溉危险性应按火僻灾危险性最大锄的物品确定。

横丁、戊类储存泡物品仓库的火婶灾危险性，当这可燃包装重量亮大于物品本身序重量蓝1/4额或可燃包装体是积大于物品本既身体积的丛1/2辜时，应按丙类姥确定。仔3.2号厂房和仓库的钓耐火等级

剃厂房和仓库的辞耐火等级可分处为一、二、三蓬、四级，相应镜建筑构件的燃莫烧性能和觉耐火极限，除痒本规范另有规虫定外，不应低威于表的规定。表

埋不同耐火等级项厂房和仓库建疾筑构件的燃烧呀性能和耐火极抵限（窃h撕）7构件名称构件名称耐火等级构件名称一级二级三级四级墙防火墙不燃性3.00不燃性3.00不燃性3.00不燃性3.00墙承重墙不燃性3.00不燃性2.50不燃性2.00难燃性0.50墙楼梯间和前室的墙电梯井的墙不燃性2.00不燃性2.00不燃性1.50难燃性0.50墙疏散走道两侧的隔墙不燃性1.00不燃性1.00不燃性0.50难燃性0.25墙非承重外墙房间隔墙不燃性0.75不燃性0.50难燃性0.50难燃性0.25柱不燃性3.00不燃性2.50不燃性2.00难燃性0.50梁不燃性2.00不燃性1.50不燃性1.00难燃性0.50楼板不燃性1.50不燃性1.00不燃性0.75难燃性0.50屋顶承重构件不燃性1.50不燃性1.00难燃性0.50可燃性疏散楼梯不燃性1.50不燃性1.00不燃性0.75可燃性吊顶（包括吊顶搁栅）不燃性0.25难燃性0.25难燃性0.15可燃性恰注：二级耐火舍等级建筑内采蹦用不燃材料的漆吊顶，其耐火汽极限不限。

鸽高层厂房，甲礼、乙类厂房的钟耐火等级不应愿低于二级，建松筑面积不大于印300m年2驻的独立甲、乙魂类单层厂房可瞒采用三级耐火衔等级的建筑。

旋单、多层丙类头厂房和多层丁曾、戊类厂房的脊耐火等级不应尺低于三级。均使用或产生丙诵类液体的厂房供和有火花、赤御热表面、明火择的丁类厂房，续其耐火等堆级均不应低于溪二级；当为建永筑面积不大于栋500m洽2苏的单层丙类厂泪房或建筑面积耐不大于斑1000m腊2片的单层丁类厂圈房时，可采用们三级耐火等级艰的建筑。

凡使用或储存特录殊贵重的机器旺、仪表、仪器仅等设备或物品艘的建筑，其耐绵火等级丛不应低于二级索。

湾锅炉房的耐火杯等级不应低于锋二级，当为燃氧煤锅炉房且锅彻炉的总蒸发量司不大于亿4t/h杂时，可采用三铅级耐火等级的迷建筑。

霉油浸变压器室著、高压配电装疑置室的耐火等狸级不应低于二竭级，其他防火鞭设计应符柴合现行国家标妻准《火力发电雨厂和变电站设肃计防火规范》龟GB502禽29透等标准的规定酒。

殃高架仓库、高弟层仓库、甲类喊仓库、多层乙镜类仓库和储存卧可燃液体的多乞层丙类留仓库，其耐火浓等级不应低于樱二级。欺单层乙类仓库烟，单、多层丙算类仓库和多层摩丁、戊类仓库诊，其耐火等级佳不应低于三级。

欠粮食筒仓的耐常火等级不应低愿于二级；二级番耐火等级的粮传食筒仓可采用打钢板仓。匙粮食平房仓的仙耐火等级不应饮低于三级；二湿级耐火等级的在散装粮食平房遥仓可采用无守防火保护的金锐属承重构件。

颤甲、乙类厂房蛙和甲、乙、丙亡类仓库内的防愿火墙，其耐火堤极限不应低于陶4.00h表。胡一、二级耐火巴等级单层厂房啦（仓库）的柱拘，其耐火极限猫分别不应低于蓄2.50h皱和伯2.00h改。

发采用自动喷水随灭火系统全保寒护的一级耐火士等级单、多层太厂房（仓库）盒的屋顶刑承重构件，其祝耐火极限不应阅低于届1.00h鸭。尖除一级耐火等斑级的建筑外，迅下列建筑构件帝可采用无防火尘保护的金属结进构，其中能魂受到甲、乙、摘丙类液体或可今燃气体火焰影炸响的部位应采戚取外包覆不燃规材料或其他防斩火保护措施：123

扯设置自动灭火保系统的单层丙妹类厂房的梁、巡柱和屋顶承重葵构件；鄙设置自动灭火逗系统的多层丙柴类厂房的屋顶畜承重构件；懂单、多层丁、辆戊类厂房（仓玉库）的梁、柱除和屋顶承重构妇件。鸦除甲、乙类仓饭库和高层仓库态外，一、二级石耐火等级建筑戏的非承重外墙终，当采8霜用不燃性墙体它时，其耐火极榜限不应低于熊0.25h机；当采用难燃进性墙体时，不做应低于厦0.50h堵。闪4职层及陡4孔层以下的一、刚二级耐火等级孕丁、戊类地上验厂房（仓库）汇的非承重外墙统，劈当采用不燃性凳墙体时，其耐析火极限不限；浇当采用难燃性樱轻质复合墙体于时，其表面材违料挣应为不燃材料煮、内填充材料羊的燃烧性能不般应低于孕B榜2多级。材料的燃幻烧性能分级应西符合够现行国家标准免《建筑材料及秆制品燃烧性能均分级》拜GB862警4肌的规定。

鞋二级耐火等级照厂房（仓库）乐内的房间隔墙纳，当采用难燃唤性墙体时，其矩耐火极键限应提高璃0.25h屋。

因二级耐火等级亭多层厂房和多迎层仓库内采用灰预应力钢筋混薄凝土的楼板，蚀其耐火还极限不应低于期0.75h草。

演一、二级耐火龄等级厂房（仓安库）的上人平兽屋顶，其屋面罩板的耐火极限嚷分别不劝应低于打1.50h燃谊和嫁1.00h颗。

膀一、二级耐火咸等级厂房（仓删库）的屋面板滴应采用不燃材痒料，但其屋面临防水层乏和绝热层可采浴用可燃材料；蚊当为少4役层及蚀4