隨著鋼結構在(zai)建筑材料中(zhong)的(de)(de)(de)(de)(de)興(xing)起，越(yue)(yue)來越(yue)(yue)多的(de)(de)(de)(de)(de)人(ren)選擇使用鋼結構樓承(cheng)(cheng)板(ban)了，鋼結構構件(jian)工(gong)廠產業化生產大大縮短了工(gong)程工(gong)期(qi)，而樓板(ban)的(de)(de)(de)(de)(de)施工(gong)方法卻成為影響工(gong)期(qi)的(de)(de)(de)(de)(de)重要因素。采用那一代樓承(cheng)(cheng)板(ban)對于(yu)樓板(ban)的(de)(de)(de)(de)(de)耐(nai)火性能也(ye)有區別。樓承(cheng)(cheng)板(ban)的(de)(de)(de)(de)(de)厚(hou)度(du)(du)(du)一般都是按(an)保險(xian)起見(jian)設(she)計的(de)(de)(de)(de)(de)比較厚(hou)，正常情況下(xia)鋼梁之(zhi)間的(de)(de)(de)(de)(de)跨度(du)(du)(du)在(zai)2m以(yi)內樓承(cheng)(cheng)板(ban)厚(hou)度(du)(du)(du)在(zai)0.75-0.8mm就(jiu)可(ke)(ke)以(yi)了，2-2.5m樓承(cheng)(cheng)板(ban)厚(hou)度(du)(du)(du)用0.8-1.0就(jiu)可(ke)(ke)以(yi)了，跨度(du)(du)(du)在(zai)3-4米(mi)樓承(cheng)(cheng)板(ban)厚(hou)度(du)(du)(du)用1.5mm，超過5m的(de)(de)(de)(de)(de)跨度(du)(du)(du)是用臨時支撐，因素就(jiu)是混(hun)(hun)泥土澆筑的(de)(de)(de)(de)(de)高度(du)(du)(du)，混(hun)(hun)泥土澆筑的(de)(de)(de)(de)(de)越(yue)(yue)高，樓承(cheng)(cheng)板(ban)所(suo)需要的(de)(de)(de)(de)(de)厚(hou)度(du)(du)(du)也(ye)就(jiu)越(yue)(yue)厚(hou)，還(huan)有一個大家容易忽略(lve)的(de)(de)(de)(de)(de)因素就(jiu)是螺釘的(de)(de)(de)(de)(de)好(hao)壞也(ye)是決定樓承(cheng)(cheng)板(ban)厚(hou)度(du)(du)(du)的(de)(de)(de)(de)(de)，螺釘越(yue)(yue)好(hao)樓承(cheng)(cheng)板(ban)的(de)(de)(de)(de)(de)承(cheng)(cheng)載力(li)就(jiu)越(yue)(yue)強。

重慶鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)板(ban)(ban)(ban)(ban)(ban)(ban)按生產及加(jia)工方法可分為(wei)以(yi)(yi)下幾(ji)類： 熱浸(jin)鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)鋼板(ban)(ban)(ban)(ban)(ban)(ban)。將薄(bo)鋼板(ban)(ban)(ban)(ban)(ban)(ban)浸(jin)入熔解的(de)鋅(xin)(xin)(xin)(xin)(xin)槽中(zhong)，使其表(biao)面粘附一層鋅(xin)(xin)(xin)(xin)(xin)的(de)薄(bo)鋼板(ban)(ban)(ban)(ban)(ban)(ban)。目前(qian)主要采用連續鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)工藝生產，即把成(cheng)卷的(de)鋼板(ban)(ban)(ban)(ban)(ban)(ban)連續浸(jin)在(zai)熔解有鋅(xin)(xin)(xin)(xin)(xin)的(de)鍍(du)(du)槽中(zhong)制成(cheng)鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)鋼板(ban)(ban)(ban)(ban)(ban)(ban)； 合(he)金(jin)化鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)鋼板(ban)(ban)(ban)(ban)(ban)(ban)。為(wei)克服單面未涂(tu)鋅(xin)(xin)(xin)(xin)(xin)的(de)缺點(dian)，又有一種在(zai)另面涂(tu)以(yi)(yi)薄(bo)層鋅(xin)(xin)(xin)(xin)(xin)的(de)鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)板(ban)(ban)(ban)(ban)(ban)(ban)，即雙面差(cha)鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)板(ban)(ban)(ban)(ban)(ban)(ban)；合(he)金(jin)、復(fu)合(he)鍍(du)(du)鋅(xin)(xin)(xin)(xin)(xin)鋼板(ban)(ban)(ban)(ban)(ban)(ban)。它是用鋅(xin)(xin)(xin)(xin)(xin)和其他金(jin)屬(shu)如(ru)鉛(qian)、鋅(xin)(xin)(xin)(xin)(xin)制成(cheng)合(he)金(jin)乃至復(fu)合(he)鍍(du)(du)成(cheng)的(de)鋼板(ban)(ban)(ban)(ban)(ban)(ban)。這種鋼板(ban)(ban)(ban)(ban)(ban)(ban)既具有防銹性能(neng)，又有良好(hao)的(de)涂(tu)裝性能(neng)。

首先，在鋼結構樓層板中要達到耐火1.5小時，總的來說可以選擇開口板、縮口板、閉口板三大類。咸陽白鐵規范上混凝土要高于開口板肋頂之上80mm，并且板底需配置板底受力筋。還有一種就是再開口板底部刷防火涂料，涂料厚度大于等于15,這樣的話，只要達到構造要求高于肋頂5公分就可以了。白鐵廠家而縮口(kou)板和閉口(kou)板，只(zhi)需(xu)(xu)要(yao)(yao)總的樓板厚(hou)度大于等于110即可，但是縮口(kou)板雖(sui)然在防火(huo)方面比開口(kou)板要(yao)(yao)好。但是底部還是需(xu)(xu)要(yao)(yao)加板底受力(li)筋，而閉口(kou)板則不需(xu)(xu)要(yao)(yao)。

鍍(du)鋅(xin)(xin)(xin)(xin)帶鋼(gang)的鋅(xin)(xin)(xin)(xin)層(ceng)特性 電鍍(du)鋅(xin)(xin)(xin)(xin)層(ceng)是(shi)不能形成(cheng)鋅(xin)(xin)(xin)(xin)花(hua)(hua)的，熱鍍(du)鋅(xin)(xin)(xin)(xin)層(ceng)則(ze)有鋅(xin)(xin)(xin)(xin)花(hua)(hua)，其(qi)(qi)形成(cheng)過程(cheng)如(ru)下(xia)：當鍍(du)鋅(xin)(xin)(xin)(xin)帶從鋅(xin)(xin)(xin)(xin)鍋出來(lai)后，經氣(qi)刀(dao)的噴(pen)吹(chui)，大(da)量鋅(xin)(xin)(xin)(xin)液被(bei)吹(chui)回鋅(xin)(xin)(xin)(xin)鍋，這(zhe)時帶鋼(gang)表(biao)面(mian)還有純鋅(xin)(xin)(xin)(xin)層(ceng)，呈液 態附在鋼(gang)板表(biao)面(mian)，在鋼(gang)板表(biao)面(mian)形成(cheng)大(da)量結(jie)晶(jing)核，隨(sui)著鋼(gang)板上升冷(leng)卻，使結(jie)晶(jing)核慢(man)慢(man)長成(cheng)鋅(xin)(xin)(xin)(xin)花(hua)(hua)。冷(leng)卻速(su)度越快鋅(xin)(xin)(xin)(xin)花(hua)(hua)越小，冷(leng)卻速(su)度越慢(man)鋅(xin)(xin)(xin)(xin)花(hua)(hua)越大(da)。熱鍍(du)鋅(xin)(xin)(xin)(xin)帶鋼(gang)在我國(guo)市場一(yi)直是(shi)緊缺品種。從20世紀(ji)90年代(dai)中(zhong)期以來(lai)，每年都要從國(guo)外進口80-100萬t左右(you)。隨(sui)著國(guo)內經濟的發(fa)展，尤(you)其(qi)(qi)是(shi)汽車、家電及建筑業的發(fa)展，對鍍(du)鋅(xin)(xin)(xin)(xin)帶鋼(gang)的需求(qiu)量也(ye)大(da)大(da)增加。

熱(re)(re)(re)浸(jin)(jin)(jin)鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)板(ban)(ban)將薄(bo)(bo)鋼(gang)板(ban)(ban)浸(jin)(jin)(jin)入熔解的鋅(xin)(xin)(xin)槽(cao)中，使其(qi)表面(mian)(mian)粘附一層鋅(xin)(xin)(xin)的薄(bo)(bo)鋼(gang)板(ban)(ban)。目前主要(yao)采用連續鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)工藝生產，即把成卷的鋼(gang)板(ban)(ban)連續浸(jin)(jin)(jin)在熔解有(you)(you)鋅(xin)(xin)(xin)的鍍(du)(du)(du)(du)(du)槽(cao)中制(zhi)成鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)板(ban)(ban);合(he)金(jin)化鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)板(ban)(ban)。這種鋼(gang)板(ban)(ban)也是用熱(re)(re)(re)浸(jin)(jin)(jin)法制(zhi)造(zao)(zao)，但在出(chu)槽(cao)后，立(li)即把它加熱(re)(re)(re)到500 ℃左右，使其(qi)生成鋅(xin)(xin)(xin)和鐵的合(he)金(jin)被膜。這種鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)板(ban)(ban)具(ju)(ju)有(you)(you)良(liang)(liang)好(hao)(hao)的涂(tu)(tu)料(liao)的密著性和焊(han)接性;電鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)板(ban)(ban)。用電鍍(du)(du)(du)(du)(du)法制(zhi)造(zao)(zao)這種鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)板(ban)(ban)具(ju)(ju)有(you)(you)良(liang)(liang)好(hao)(hao)的加工性。但鍍(du)(du)(du)(du)(du)層較薄(bo)(bo)，耐腐蝕性不(bu)如(ru)熱(re)(re)(re)浸(jin)(jin)(jin)法鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)板(ban)(ban);單面(mian)(mian)鍍(du)(du)(du)(du)(du)和雙面(mian)(mian)差鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)板(ban)(ban)。單面(mian)(mian)鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)鋼(gang)板(ban)(ban)，即只在一面(mian)(mian)鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)的產品(pin)。在焊(han)接、涂(tu)(tu)裝、防銹處理、加工等方面(mian)(mian)，具(ju)(ju)有(you)(you)比雙面(mian)(mian)鍍(du)(du)(du)(du)(du)鋅(xin)(xin)(xin)板(ban)(ban)好(hao)(hao)的適應性。