施(shi)工工程(cheng)在購(gou)買鋼(gang)筋(jin)(jin)桁架樓承板(ban)(ban)時可選擇厚度(du)(du)或其他因素。當(dang)鋼(gang)筋(jin)(jin)桁架樓承板(ban)(ban)耐火*限為1.5小(xiao)時時,地板(ban)(ban)承重板(ban)(ban)的厚度(du)(du)受(shou)我們(men)的影(ying)響(xiang)。鋼(gang)筋(jin)(jin)桁架樓承板(ban)(ban)上的水泥(ni)需要多厚呢?
首先,為了使鋼(gang)結構樓(lou)板(ban)(ban)(ban)承重板(ban)(ban)(ban)達(da)到1.5小時的耐(nai)火*限,一般來說(shuo),可以(yi)選擇三種類型的開(kai)放板(ban)(ban)(ban)、收縮板(ban)(ban)(ban)和(he)封(feng)閉板(ban)(ban)(ban)。本規范混凝土高出(chu)明(ming)板(ban)(ban)(ban)肋頂80mm,板(ban)(ban)(ban)底(di)在板(ban)(ban)(ban)底(di)設置應(ying)力鋼(gang)筋。
另(ling)外,在開敞式地板承重(zhong)板底部還有另(ling)一種(zhong)刷防火涂料(liao)的方法,涂層厚度(du)大于(yu)或等(deng)于(yu)15。這樣,只(zhi)要(yao)滿足(zu)結構要(yao)求,就可(ke)以(yi)高出肋頂5cm。
對于收縮板和封閉板,只有地板總厚度大于或等于110mm。在此應了解,盡管收縮板在防火方面優于開放板,但仍需要在板底部進行應力加固,而不需要封閉板。