重(zhong)慶(qing)樓(lou)(lou)承(cheng)板(ban)(ban)(ban)(ban)(ban)分兩種(zhong)。一(yi)種(zhong)是把樓(lou)(lou)承(cheng)板(ban)(ban)(ban)(ban)(ban)當(dang)做承(cheng)受拉力(li)的(de)(de)鋼(gang)筋計(ji)(ji)(ji)算(suan)(suan)的(de)(de)，另外一(yi)種(zhong)是僅把樓(lou)(lou)承(cheng)板(ban)(ban)(ban)(ban)(ban)作為模(mo)板(ban)(ban)(ban)(ban)(ban)計(ji)(ji)(ji)算(suan)(suan)而不(bu)參與受力(li)的(de)(de)。做模(mo)板(ban)(ban)(ban)(ban)(ban)計(ji)(ji)(ji)算(suan)(suan)的(de)(de)比(bi)較簡單，直(zhi)接按(an)照(zhao)跨度頂就行了。2米以(yi)下選0.8的(de)(de)，2-3米的(de)(de)選1.0的(de)(de)。樓(lou)(lou)承(cheng)板(ban)(ban)(ban)(ban)(ban)作為受力(li)鋼(gang)筋計(ji)(ji)(ji)算(suan)(suan)，就按(an)照(zhao)模(mo)板(ban)(ban)(ban)(ban)(ban)的(de)(de)選用樓(lou)(lou)承(cheng)板(ban)(ban)(ban)(ban)(ban)（或者(zhe)加厚(hou)且只能(neng)加厚(hou)），然后(hou)在計(ji)(ji)(ji)算(suan)(suan)配筋的(de)(de)時候(hou)可以(yi)按(an)照(zhao)面積(ji)減(jian)少鋼(gang)筋用量。樓(lou)(lou)承(cheng)板(ban)(ban)(ban)(ban)(ban)不(bu)能(neng)單獨計(ji)(ji)(ji)算(suan)(suan)的(de)(de)，它和(he)整個樓(lou)(lou)板(ban)(ban)(ban)(ban)(ban)是一(yi)個體系的(de)(de)。

鍍鋅(xin)(xin)(xin)(xin)(xin)帶(dai)(dai)鋼(gang)的(de)(de)鋅(xin)(xin)(xin)(xin)(xin)層(ceng)(ceng)特性(xing) 電(dian)鍍鋅(xin)(xin)(xin)(xin)(xin)層(ceng)(ceng)是不能形(xing)成鋅(xin)(xin)(xin)(xin)(xin)花(hua)的(de)(de)，熱(re)鍍鋅(xin)(xin)(xin)(xin)(xin)層(ceng)(ceng)則有(you)鋅(xin)(xin)(xin)(xin)(xin)花(hua)，其(qi)形(xing)成過程如(ru)下(xia)：當鍍鋅(xin)(xin)(xin)(xin)(xin)帶(dai)(dai)從(cong)(cong)鋅(xin)(xin)(xin)(xin)(xin)鍋(guo)出來(lai)后(hou)，經(jing)氣刀的(de)(de)噴吹，大(da)(da)量鋅(xin)(xin)(xin)(xin)(xin)液被吹回鋅(xin)(xin)(xin)(xin)(xin)鍋(guo)，這(zhe)時帶(dai)(dai)鋼(gang)表(biao)面還有(you)純(chun)鋅(xin)(xin)(xin)(xin)(xin)層(ceng)(ceng)，呈液 態附(fu)在(zai)(zai)鋼(gang)板表(biao)面，在(zai)(zai)鋼(gang)板表(biao)面形(xing)成大(da)(da)量結(jie)晶(jing)核，隨著鋼(gang)板上升冷(leng)(leng)卻，使結(jie)晶(jing)核慢慢長成鋅(xin)(xin)(xin)(xin)(xin)花(hua)。冷(leng)(leng)卻速(su)度越快鋅(xin)(xin)(xin)(xin)(xin)花(hua)越小，冷(leng)(leng)卻速(su)度越慢鋅(xin)(xin)(xin)(xin)(xin)花(hua)越大(da)(da)。熱(re)鍍鋅(xin)(xin)(xin)(xin)(xin)帶(dai)(dai)鋼(gang)在(zai)(zai)我國(guo)市場一直是緊缺品種。從(cong)(cong)20世紀(ji)90年代中期以來(lai)，每年都(dou)要從(cong)(cong)國(guo)外進(jin)口80-100萬(wan)t左右。隨著國(guo)內經(jing)濟的(de)(de)發展(zhan)，尤其(qi)是汽車(che)、家電(dian)及建筑業的(de)(de)發展(zhan)，對(dui)鍍鋅(xin)(xin)(xin)(xin)(xin)帶(dai)(dai)鋼(gang)的(de)(de)需求量也大(da)(da)大(da)(da)增加。

鍍(du)(du)(du)鋅(xin)(xin)鋼(gang)板按(an)用(yong)(yong)(yong)途又可(ke)(ke)(ke)分(fen)為(wei)一(yi)(yi)般用(yong)(yong)(yong)、屋頂用(yong)(yong)(yong)、建筑外(wai)側板用(yong)(yong)(yong)、結構用(yong)(yong)(yong)、瓦(wa)壟板用(yong)(yong)(yong)、拉伸(shen)用(yong)(yong)(yong)和深沖(chong)用(yong)(yong)(yong)等鍍(du)(du)(du)鋅(xin)(xin)鋼(gang)板。對于(yu)一(yi)(yi)般防(fang)(fang)(fang)保護(hu)(hu)用(yong)(yong)(yong)鍍(du)(du)(du)層(ceng)，可(ke)(ke)(ke)以(yi)采(cai)用(yong)(yong)(yong)堿(jian)性(xing)鋅(xin)(xin)酸鹽鍍(du)(du)(du)鋅(xin)(xin)彩色鈍化工(gong)藝。有(you)時為(wei)了(le)產品的配色需要(yao)，也可(ke)(ke)(ke)以(yi)采(cai)用(yong)(yong)(yong)藍白(bai)色鈍化工(gong)藝，比如軍綠色鈍化、黑色鈍化等。為(wei)提高(gao)鋼(gang)管(guan)(guan)的耐(nai)腐(fu)(fu)(fu)(fu)蝕(shi)性(xing)能(neng)，對一(yi)(yi)般鋼(gang)管(guan)(guan)進(jin)行鍍(du)(du)(du)鋅(xin)(xin)。鍍(du)(du)(du)鋅(xin)(xin)卷分(fen)熱鍍(du)(du)(du)鋅(xin)(xin)和電(dian)鍍(du)(du)(du)鋅(xin)(xin)兩種(zhong)，熱鍍(du)(du)(du)鋅(xin)(xin)鍍(du)(du)(du)鋅(xin)(xin)層(ceng)厚，電(dian)鍍(du)(du)(du)鋅(xin)(xin)成本低，表面不是很光滑。吹氧焊(han)管(guan)(guan)：用(yong)(yong)(yong)作煉鋼(gang)吹氧用(yong)(yong)(yong)管(guan)(guan)，一(yi)(yi)般用(yong)(yong)(yong)小口(kou)徑的焊(han)接鋼(gang)管(guan)(guan)，規格由3/8-2寸八種(zhong)。用(yong)(yong)(yong)08、10、15、20或者195-Q235的鋼(gang)帶制作成的，為(wei)了(le)防(fang)(fang)(fang)腐(fu)(fu)(fu)(fu)蝕(shi)，有(you)得進(jin)行滲(shen)鋁(lv)處理。鍍(du)(du)(du)鋅(xin)(xin)其防(fang)(fang)(fang)護(hu)(hu)作用(yong)(yong)(yong)更(geng)強(qiang)，抗腐(fu)(fu)(fu)(fu)蝕(shi)能(neng)力(li)強(qiang)。整(zheng)個結構由鋅(xin)(xin)，形(xing)成致密的四元結晶體，此結晶體在鋼(gang)板上(shang)形(xing)成一(yi)(yi)層(ceng)屏障(zhang)， 因(yin)而有(you)效的防(fang)(fang)(fang)止腐(fu)(fu)(fu)(fu)蝕(shi)因(yin)子穿(chuan)透。 耐(nai)腐(fu)(fu)(fu)(fu)蝕(shi)性(xing)來自(zi)鋅(xin)(xin)的障(zhang)礙層(ceng)保護(hu)(hu)功能(neng)強(qiang)。

冷軋卷批發鍍鋅方管是一種具以熱軋或冷軋鍍鋅帶鋼或鍍鋅卷板為坯料經冷彎曲加工成型后再經高頻焊接制成的方形截面形狀尺寸的空心方形的截面型鋼鋼管;或將事先做好的冷彎空心型鋼管再經熱浸鍍鋅加工而成的鍍鋅方矩管。酒鋼冷軋卷批發鍍(du)(du)鋅(xin)(xin)卷廠產(chan)量(liang)隨著(zhu)國民生活水平不斷提高和城市化建設的不斷推進(jin)，從(cong)現在(zai)的1.6億(yi)噸每(mei)年，增(zeng)加到3億(yi)噸甚至更多也不是(shi)什么(me)很遙遠的夢想(xiang)。作為煉鋼(gang)原料的鐵礦石(shi)(shi)與廢鋼(gang)，前者是(shi)不可(ke)的資(zi)源，后者是(shi)可(ke)以(yi)循環利用的資(zi)源。無論(lun)從(cong)環保角(jiao)度還是(shi)從(cong)鋼(gang)企(qi)的運作成(cheng)本上看(kan)，廢鋼(gang)都有(you)著(zhu)礦石(shi)(shi)所無法(fa)比(bi)擬的優勢。發(fa)(fa)展(zhan)(zhan)高強度熱鍍(du)(du)鋅(xin)(xin)鋼(gang)板。隨著(zhu)汽(qi)車(che)(che)工業逐漸向、節能(neng)方向發(fa)(fa)展(zhan)(zhan)，對汽(qi)車(che)(che)用鍍(du)(du)鋅(xin)(xin)鋼(gang)板性能(neng)要求也進(jin)一(yi)步提高。為了汽(qi)車(che)(che)板的耐腐蝕性，將擴大(da)熱鍍(du)(du)鋅(xin)(xin)鋼(gang)板的使用率。