
交通護欄鑄鐵底座、公路墩、鑄鐵底座、交通護欄、鑄鐵護欄底座、道路護欄底座為空心薄壁墩:墩身混凝土施工可采用滑模或翻模施工,施工注意新老混凝土結合面的清洗和鑿毛,為使全橋顏色一致,宜選用同一種水泥.在進行墩身施工時應注意安裝主梁零號塊托架的預埋構件.主墩身第一次澆注時應至少澆筑2米高度的空心墩柱,即主墩第一節高度至少應達到4.5米,以減少剛度突變帶來的混凝土收縮裂縫.墩身垂直度允許偏差不得大于1/1000,且墩身各斷面中心位置與設計位置偏差不得大于2厘米.墩身表面需安裝貼面冷軋帶肋鋼筋焊網,網片之間的接長采用插接,插接長杜不小于20厘米.墩身和承臺之間的混凝土澆注齡期差不得大于20天.墩身均未設置爬梯和通風孔,施工單位可根據需要進行設置,但不可截斷原有結構鋼筋. 公路墩施工混凝土澆筑前應注意如下預埋件的安設麻面原因分析
(1)施工時所(suo)用(yong)模板表面不(bu)光滑(hua),雜物未清(qing)理干凈(jing),脫模劑(ji)涂刷的不(bu)均勻,漏刷;
(2)構件(jian)變形(xing),接縫不平;
(3)振搗不實.
防治措施
(1)模板的(de)雜(za)物要清理干(gan)凈,且要打磨光滑.澆(jiao)筑混凝(ning)土(tu)前模板均勻涂刷脫模劑;
(2)堵嚴模板,澆筑中隨時(shi)處理好漏(lou)漿(jiang);
(3)振搗要充分密(mi)實.
缺(que)棱(leng)掉(diao)角原(yuan)因分析
(1)鋼模板未涂脫模劑或涂刷不勻;
(2)澆筑(zhu)后混凝(ning)土養護不好(hao);
(3)拆模過(guo)早且(qie)拆模后構件受外力碰(peng)撞,或拆模方法不正確.
防治措施
(1)澆(jiao)筑混凝土前模板(ban)要均勻(yun)涂刷隔離劑;
(2)做(zuo)好混凝土(tu)的(de)養護工作;
(3)按(an)規定(ding)的(de)時(shi)間拆(chai)(chai)模并做(zuo)好成(cheng)品的(de)保護工作,掌握(wo)正(zheng)確的(de)拆(chai)(chai)模方法.
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