
公路墩(dun)為空心薄壁墩(dun):墩(dun)身混凝土施工可采用(yong)滑(hua)模(mo)或翻模(mo)施工,施工注意新老混凝土結合面的清洗和鑿毛,
為使全橋顏(yan)色一(yi)致,宜選用同一(yi)種(zhong)水(shui)泥(ni).在進(jin)行(xing)墩(dun)身施工時應注意安裝主梁零號(hao)塊(kuai)托架的預埋(mai)構件.主墩(dun)身第一(yi)
次澆(jiao)(jiao)注(zhu)時應(ying)至(zhi)(zhi)少澆(jiao)(jiao)筑(zhu)2米(mi)高(gao)度的空心墩柱,即主墩第一(yi)節高(gao)度至(zhi)(zhi)少應(ying)達(da)到4.5米(mi),以減少剛(gang)度突變帶來的混(hun)凝土
收縮(suo)裂縫.墩身垂直度允(yun)許偏差(cha)不得大于1/1000,且(qie)墩身各(ge)斷面(mian)(mian)中心(xin)位(wei)置(zhi)與設(she)(she)計位(wei)置(zhi)偏差(cha)不得大于2厘米.墩身表面(mian)(mian)需安裝(zhuang)貼面(mian)(mian)冷軋(ya)帶肋(lei)鋼筋(jin)焊網,網片之間的接(jie)(jie)(jie)長采用插接(jie)(jie)(jie),插接(jie)(jie)(jie)長杜不小(xiao)于20厘米.墩身和承(cheng)臺(tai)之間的混凝土澆注齡(ling)期差(cha)不得大于20天.墩身均未設(she)(she)置(zhi)爬梯和通風孔,施工單位(wei)可(ke)根據需要進行設(she)(she)置(zhi),但不可(ke)截斷原有結(jie)構(gou)鋼筋(jin).
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