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鋼板樁施(shi)工(gong)(gong)(gong)關系到施(shi)工(gong)(gong)(gong)支護和(he)安全,是工(gong)(gong)(gong)程(cheng)施(shi)工(gong)(gong)(gong)關鍵的工(gong)(gong)(gong)序之(zhi)一,在(zai)施(shi)工(gong)(gong)(gong)中(zhong)要注意以下施(shi)工(gong)(gong)(gong)技術(shu)要求:
(1)確定定樁位,按順序每(mei)隔1m標明鋼板樁的具體樁位,灑灰(hui)線(xian)或噴漆標明。
(2)鋼板樁施打(da)前一定(ding)要熟悉(xi)地(di)下管(guan)線(xian)、構筑物的(de)情況,認真放(fang)出準確(que)的(de)支護(hu)樁中線(xian)。
(3)打樁前(qian),對鋼(gang)管、鋼(gang)板(ban)樁逐(zhu)根檢查,剔除變(bian)形嚴重的鋼(gang)管、鋼(gang)板(ban)樁,不(bu)合格者(zhe)待修整后才可(ke)使用。
(4)在插打過(guo)程中隨時測量監控每(mei)塊(kuai)樁的斜(xie)(xie)度不(bu)超過(guo)2%,當偏斜(xie)(xie)過(guo)大不(bu)能用拉齊(qi)方法(fa)調(diao)正時,拔(ba)起(qi)重(zhong)打。
(5)鋼板樁(zhuang)沉樁(zhuang)施工前先進(jin)行試(shi)樁(zhuang),試(shi)樁(zhuang)鋼管數(shu)量不小于10根。
(6)鋼(gang)板樁放線(xian)施工(gong)時(shi),樁頭就位(wei)必須正(zheng)確、垂直。沉樁過(guo)程(cheng)中,隨時(shi)檢測,發現(xian)問題,及時(shi)處理。沉樁容許偏差(cha)為平面(mian)位(wei)置(zhi)縱向(xiang)100 mm,橫向(xiang)為-50~0mm,斜度(du)不超過(guo)2%。
(7)基(ji)坑開挖后鋼板(ban)樁須垂直平順,無嚴重(zhong)扭曲、傾(qing)斜和劈裂現象。
(8)沉樁(zhuang)施前必(bi)須平(ping)整、清除地(di)下、地(di)面及高空障礙(ai)物,需(xu)保(bao)留的地(di)下管線應(ying)挖露出(chu)來,加(jia)以(yi)保(bao)護。
(9)基坑土方(fang)和(he)結構施工(gong)期間,應對基坑圍巖(yan)和(he)支護系統進(jin)行動態觀測,發現問題,及時處理。