2022年钢筋保护层厚度规范-钢筋保护层 .pdf

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1、difficult,not hating;blueprints,not rhetoric;words and simple,but full of love,truth,passi on,e ntrepreneurial passion.Take this opportunity,my inspirational quotes Li Dazhaos classic iron specialise in uplifting blend with the article gave everyone,with a view on how to do well under the new situat

2、ion of township and village leaders inspir e and help,and also share with you.A good play to cre ate iron shoulders strong arms,to assume the burden be passed;only specific qualities,will it be possible in specific areas to create a world.In my view,village chiefs in the ne w situa tion,we must firs

3、t have five basic quality.One ambition is to pioneer.Who is handsome.People only high-minde d can stimulate the flow of momentum to become brave and persistent,become quiet and powerf ul.Township and village party leaders,within their respective jurisdictions,political stability and economi c and so

4、cial development issues,decisi ons a nd orientation depends to a large extent be cause of your.Everybody in village chiefs and the positions,both the trust of the masses,the Organizations trust,more ability to you,fully affirmed the moral and other qualities.Therefore,we must always maintain the his

5、torical missi on and social responsibility,and our ideal tree rooted in the hard work of the soil,with indomitable spirit,indomitable courage to open up a new situation of villages and tow ns.To have a feeling of closeness to the second.The people and country.Our business foundation in the pe opl es

6、 blood in the people power pe ople.Advanced decisi ons of the party cadres to the feelings of the people is an eternal theme.Fan Zhong-yan,called first,and enjoy comfort about others,Zheng Ba nqi aos also wrote a Ya Chai lay listening to the rustling of bamboo,the suspect is suffering.Cao County off

7、icials,little my,a total turn off.Old of feudal official even has so feelings,alone we is to serving for purposes of pe ople servant does?we more should always hold with on people of deep feelings,heart Department masses of leading visited tea,care masse s of emotions thoug hts complained,always ins

8、ist ed put masses of interests put in first,consciously from itself do up,from small do up,from masses most care,and most dire ctly,and most reality of interests problem grabbed,real do love for people by Department,and right for peopl e by with,and Lee for people by conspiracy to.Three with the fam

9、e of mind.Non-indifferent not insist your dream,without serenity not go far.Ascension to fame is morality,is the sublimation of the soul.As Township and village,be sure to maintain a normal state of mind,establish a corre ct viewpoi nt on power,position and values and Outlook,as fame is light like w

10、ater,de pending.50 km,also red and lik e hundreds of thousands of the KMT military combat,but he went on to collect a variety of newspapers and magazines,and then race against time to pore over.As long as the study of mind,it is not necessary to come to the library,workshops,into the villages,people

11、 learned farming techniques,probl em-solving methods,participation in onferences,learned superiors poli cie s;reports,you can lear n to deal with probl ems,art,just wanted to learn,to learn at any time.To continuously expand the scope of the study.The complexity and comprehensiveness of our work,de

12、cided to not only do we want to be professionals,or if generalists,to dabble in different areas of knowledge.Mastery of knowledge not only to have knowledge to rational analysis.T his on requirements we,not only to learning national of route,and approach,a nd policy,also to learning national of lega

13、l,and regulations;not only to with politi cal theory armed mind,also to with economic theory guide work;not only to read history,also to read hi story;not only to absorption SM of mirror,also to gets is of road;not only to from local learn,also to to outside learn;not only to to books learn,also to

14、field study learn.Therefore,I would encourage you,and more to the outside world when I have time to take a look at,take a stroll,outside developments,learn other people s devel opment approach,a nd then come back to guide our work.Second,we must think.Learning without thought to overshadow,thinking

15、without learning is perilous.We want to foster the character of advanci ng with the times,forge ahead,often reflect themselves in ada pting to the new situation on whether there are delays,have anything to fear in the reform and innovation,whether in terms of accel erating the development of a relax

16、ation,keep promising State of mind.In order to do investigations,investigations is the road to heaven,God disposes of the base.To wants to real heard trut h,and justice to truth,and get truth,received effectiveness,on must in-de pth actual,a nd outreach,a nd in-depth masses,worship masses for Divisi

17、on,a nd masses heart,with masses with discussion everyone care of problem,listening they of calls,understand they of mood,feel they of suffering,summary they of experience,concentrated they of wisdom,espe cially on masses most hope,and most urgent,and most worries,and most complained of hot,and diff

18、iculties and focus problem,more to active research,caught not put.Dare to innovate,in our w ork,often remain the old way doesnt work,the new appr oach would not situation,the reason,the key is that many peopl e know that copying other peoples ideas,mechanically,usi ng someone elses old ways.To chang

19、e this pre dicame nt,requires us to break the shackles of traditional concepts to overcome conservative,conformist,good at finding new problems and to acce pt ne w things,summarize new experience,new i deas,developing new programmes and Maverick,a new approach to solve problems,speed up development.

20、Especially in implement superior poli cy spirit of process in the,both implementation,and cannot mechanical ly,to to extraordinary of courage and develop enterprising of spirit,put flexibility and principle combined up,put superior of spirit and local reality combined up,Yong conspiracy to breakthro

21、ugh of policy,and exercise i nnovation of lift,developed out development works of,a nd grass-roots welcomes of钢筋保护层厚度分析分享保护层指的是混凝土上面那层小部分垫层。混凝土保护层 是指混凝土构件中，起到保护钢筋避免钢筋直接裸露的那一部分混凝土。混凝土保护层定义：指混凝土构件中，起到保护钢筋避免钢筋直接裸露的那一部分混凝土，从混凝土表面到最外层钢筋（受力钢筋）公称直径外边缘之间的最小距离：对后张法预应力筋，为套管或孔道外边缘到混凝土表面的距离。保护层最小厚度的规定是为了使混凝土结构构

22、件满足的耐久性要求和对受力钢筋有效锚固的要求。1.厚度要求根据 2010 年新的混凝土结构设计规范（GB50010-2010）保护层厚度不再是纵向钢筋（非箍筋）外缘至混凝土表面的最小距离，而是“以最外层钢筋（包括箍筋、构造筋、分布筋等）的外缘计算混凝土的保护层厚度”。因此本次修订后保护层设计厚度比原来增加！保护层最小厚度的规定是为了使混凝土结构构件满足的耐久性要求和对受力钢筋有效锚固的要求。混凝土保护层厚度大，构件的受力钢筋粘结锚固性能、耐久性和防火性能越好。但是，过大的保护层厚度会使构件受力后产生的裂缝宽度过大，就会影响其使用性能（如破坏构件表面的装修层、过大的裂缝宽度会使人恐慌不安），而且

23、由于设计中是不考虑混凝土的抗拉作用的，过大的保护层厚度还必然会造成经济上的浪费。因此，2010年混凝土结构设计规范 8.2.1 条，规定纵向受力的普通钢筋及预应力钢筋，其混凝土保护层厚度(钢筋外边缘至混凝土表面的距离)不应小于钢筋的公称直径d，且应符合下表的规定。一般设计中是采用最小值的。混凝土保护层最小厚度(mm)环境类别板、墙、壳梁、柱、杆一15 20 二 a 20 25 二 b 25 35 三 a 30 40 三 b 40 50 注：1.混凝土强度等级不大于C25时，表中保护层数值增加5mm.2.钢筋混凝土基础宜设置混凝土垫层，基础中钢筋的混凝土保护层厚度应从垫层顶面算起，且不应小于 4

24、0mm.名师资料总结-精品资料欢迎下载-名师精心整理-第 1 页，共 7 页 -difficult,not hating;blueprints,not rhetoric;words and simple,but full of love,truth,passi on,e ntrepreneurial passion.Take this opportunity,my inspirational quotes Li Dazhaos classic iron specialise in uplifting blend with the article gave everyone,with a vie

25、w on how to do well under the new situation of township and village leaders inspir e and help,and also share with you.A good play to create iron shoulders strong arms,to assume the burden be passed;only specific qualities,will it be possible in specific areas to create a world.In my view,village chi

26、efs in the ne w situa tion,we must first have five basic quality.One ambition is to pioneer.Who is handsome.People only high-minde d can stimulate the flow of momentum to become brave and persistent,become quiet and powerf ul.Township and village party leaders,within their respective jurisdictions,p

27、olitical stability and economi c and social development issues,decisi ons a nd orientation depends to a large extent be cause of your.Everybody in village chiefs and the positions,both the trust of the masses,the Organizations trust,more ability to you,fully affirmed the moral and other qualities.Th

28、erefore,we must always maintain the historical missi on and social responsibility,and our ideal tree rooted in the hard work of the soil,with indomitable spirit,indomitable courage to open up a new situation of villages and tow ns.To have a feeling of closeness to the second.The people and country.O

29、ur business foundation in the pe opl es blood in the people power pe ople.Advanced decisi ons of the party cadres to the feelings of the people is a n eternal theme.Fan Zhong-yan,called first,and enjoy comfort about others,Zheng Ba nqi aos also wrote a Ya Chai lay listening t o the rustling of bambo

30、o,the suspect is suffering.Cao County officials,little my,a total turn off.Old of feudal official even has so feelings,alone we is to serving for purposes of pe ople servant does?we more should always hold with on people of deep feelings,heart Department masses of leading visited tea,care masse s of

31、 emotions thoug hts complained,always insist ed put masses of interests put in first,consciously from itself do up,from small do up,from masses most care,and most directly,and most reality of interests problem grabbed,real do love for people by Department,and right for peopl e by with,and Lee for pe

32、ople by conspiracy to.Three with the fame of mind.Non-indifferent not insist your dream,without serenity not go far.Ascension to fame is morality,is the sublimation of the soul.As Township and village,be sure to maintain a normal state of mind,establish a correct view poi nt on power,position and va

33、lues and Outlook,as fame is light like water,depending.50 km,also red and lik e hundreds of thousands of the KMT military combat,but he went on to collect a variety of newspapers and magazines,and then race against time to pore over.As long as the study of mind,it is not necessary to come to the lib

34、rary,workshops,into the villages,people learned farming techniques,probl em-solving methods,participation in onferences,learned superiors poli cie s;reports,you can lear n to deal with probl ems,art,just wanted to learn,to learn at any time.To continuously expand the scope of the study.The complexit

35、y and comprehensiveness of our work,de cided to not only do we want to be professionals,or if generalists,to dabble in different areas of knowledge.Mastery of knowledge not only to have knowledge to rational analysis.T his on requirements we,not only to learning national of route,and approach,a nd p

36、olicy,also to learning national of legal,and regulations;not only to with politi cal theory armed mind,also to with economic theory guide work;not only to read history,also to read hi story;not only to absorption SM of mirror,also to gets is of road;not only to from local learn,also to to outside le

37、arn;not only to to books learn,also to field study learn.Therefore,I would encourage you,and more to the outside world when I have time to take a look at,take a stroll,outside developments,learn other people s devel opment approach,a nd then come back to guide our work.Second,we must think.Learning

38、without thought to overshadow,thinking without learning is perilous.We want to foster the character of advanci ng with the times,forge ahead,often reflect themselves in ada pting to the new situation on whether there are delays,have anything to fear in the reform and innovation,whether in terms of a

39、ccel erating the development of a relaxation,keep promising Stat e of mind.In order to do investigations,investigations is the road to heaven,God disposes of the base.To wants to real heard trut h,and justice to truth,and get truth,received effectiveness,on must in-de pth actual,a nd outreach,a nd i

40、n-depth masses,worship masses for Division,a nd masses heart,with masses with discussion everyone care of problem,listening they of calls,understand they of mood,feel they of suffering,summary they of experience,concentrated they of wisdom,espe cially on masses most hope,and most urgent,and most wor

41、ries,and most complained of hot,and difficulties and focus problem,more to active research,caught not put.Dare to innovate,in our w ork,often remain the old way doesnt work,the new appr oach would not situation,the reason,the key is that many peopl e know that copying other peoples ideas,mechanicall

42、y,usi ng someone elses old ways.To change this pre dicame nt,requires us to break the shackles of traditional concepts to overcome conservative,conformist,good at finding new problems and to acce pt ne w things,summarize new experience,new i deas,developing new programmes and Maverick,a new approach

43、 to solve problems,speed up development.Especially in implement superior poli cy spirit of process in the,both implementation,and cannot mechanical ly,to to extraordinary of courage and develop enterprising of spirit,put flexibility and principle combined up,put superior of spirit and local reality

44、combined up,Yong conspiracy to breakthrough of policy,and exercise i nnovation of lift,developed out development works of,a nd grass-roots welcomes of2.关于厚度的规定第 9.2.2条处于一类环境且由工厂生产的预制构件，当混凝土强度等级不低于 C20时，其保护层厚度可按本规范表9.2.1中规定减少5mm，但预应力钢筋的保护层厚度不应小于15mm;处于二类环境且由工厂生产的预制构件，当表面采取有效保护措施时，保护层厚度可按本规范表9.2.1中一类环

45、境数值取用。预制钢筋混凝土受弯构件钢筋端头的保护层厚度不应小于10mm;预制肋形板主肋钢筋的保护层厚度应按梁的数值取用。第 9.2.3条板、墙、壳中分布钢筋的保护层厚度不应小于本规范表9.2.1中相应数值减10mm，且不应小于 10mm；梁、柱中箍筋和构造钢筋的保护层厚度不应小于15mm.第 9.2.4条当梁、柱中纵向受力钢筋的混凝土保护层厚度大于40mm时，应对保护层采取有效的防裂构造措施。处于二、三类环境中的悬臂板，其上表面应采取有效的保护措施。第 9.2.5条对有防火要求的建筑物，其混凝土保护层厚度尚应符合国家现行有关标准的要求。处于四、五类环境中的建筑物，其混凝土保护层厚度尚应符合国家

46、现行有关标准的要求。第 10.1.2条国家标准 GB502042002混凝土结构工程施工质量验收规范规定必须对重要部位进行结构实体检验，主要检验混凝土强度和钢筋保护层厚度。钢筋保护层厚度检验，需要对重要构件，特别是悬挑梁和板构件，以及易发生钢筋位移、易露筋的部位，采用非破损（用先进的钢筋保护层厚度测定仪）或局部破损的方法检验。此时，纵向受力钢筋保护层厚度的允许偏差，对梁类构件为-7+10mm；对板类构件为-5+8mm。钢筋保护层厚度检验的合格点率为 90%及以上时为合格。当合格点率小于 90%，但不小于 80%，可再抽取相同数量的构件检验，当两次抽减总和计算的合格点率为 90%及以上时才能判为

47、合格。且每次抽样结果中不合格点的最大偏差均不应大于允许偏差的1.5 倍。3室内正常环境下板、墙保护层15mm，梁、柱保护层20mm4露天或室内高湿度环境：1、砼强度小于等于C20时，板、墙保护层35mm，梁、柱保护层 45mm 2、砼强度 C25或 C30时，板、墙保护层25mm，梁、柱保护层 35mm 3、砼强度大于等于C35时，板、墙保护层15mm，梁、柱保护层 25mm 基础按有无垫层区分：有垫层时40mm，无垫层时 70mm 保护层具体还要按设计图纸定，图纸设计保护层厚度有可能有小幅调整。名师资料总结-精品资料欢迎下载-名师精心整理-第 2 页，共 7 页 -difficult,not

48、 hating;blueprints,not rhetoric;words and simple,but full of love,truth,passi on,e ntrepreneurial passion.Take this opportunity,my inspirational quotes Li Dazhaos classic iron specialise in uplifting blend with the article gave everyone,with a view on how to do well under the new situation of townsh

49、ip and village leaders inspir e and help,and also share with you.A good play to create iron shoulders strong arms,to assume the burden be passed;only specific qualities,will it be possible in specific areas to create a world.In my view,village chiefs in the ne w situa tion,we must first have five ba

50、sic quality.One ambition is to pioneer.Who is handsome.People only high-minde d can stimulate the flow of momentum to become brave and persistent,become quiet and powerf ul.Township and village party leaders,within their respective jurisdictions,political stability and economi c and social developme