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鋼(gang)板(ban)樁施(shi)工(gong)(gong)(gong)(gong)關系(xi)到施(shi)工(gong)(gong)(gong)(gong)支(zhi)護(hu)和安(an)全(quan),是工(gong)(gong)(gong)(gong)程施(shi)工(gong)(gong)(gong)(gong)關鍵的工(gong)(gong)(gong)(gong)序(xu)之一,在施(shi)工(gong)(gong)(gong)(gong)中要注意以(yi)下施(shi)工(gong)(gong)(gong)(gong)技術要求(qiu):
(1)確定定樁位,按順(shun)序(xu)每隔1m標(biao)(biao)明鋼(gang)板樁的具體樁位,灑灰線(xian)或噴漆標(biao)(biao)明。
(2)鋼板樁施打(da)前一(yi)定要熟悉地下(xia)管(guan)線、構筑物的(de)情況,認真放(fang)出準確的(de)支護(hu)樁中線。
(3)打樁(zhuang)(zhuang)前,對鋼(gang)管、鋼(gang)板樁(zhuang)(zhuang)逐(zhu)根(gen)檢查,剔除變形嚴重的鋼(gang)管、鋼(gang)板樁(zhuang)(zhuang),不合格者待修整(zheng)后才可使用。
(4)在插打過(guo)(guo)程(cheng)中隨時測量監控每塊(kuai)樁的斜(xie)度不(bu)超(chao)過(guo)(guo)2%,當(dang)偏斜(xie)過(guo)(guo)大不(bu)能用拉(la)齊方法調正時,拔(ba)起(qi)重打。
(5)鋼板樁(zhuang)(zhuang)沉(chen)樁(zhuang)(zhuang)施工前先進行試樁(zhuang)(zhuang),試樁(zhuang)(zhuang)鋼管數量不小于10根。
(6)鋼(gang)板樁放線施工(gong)時,樁頭就(jiu)位必須正確、垂直(zhi)。沉樁過程中,隨時檢測(ce),發現問題(ti),及(ji)時處(chu)理。沉樁容許偏差為(wei)平(ping)面(mian)位置(zhi)縱向100 mm,橫向為(wei)-50~0mm,斜度不超過2%。
(7)基坑(keng)開挖后鋼板樁(zhuang)須垂(chui)直(zhi)平(ping)順,無嚴重(zhong)扭曲(qu)、傾斜和劈裂現象。
(8)沉(chen)樁施前(qian)必須(xu)平整、清除地(di)下(xia)、地(di)面及(ji)高空障礙物(wu),需保留的(de)地(di)下(xia)管線應挖露出來(lai),加(jia)以保護。
(9)基坑土方(fang)和結構施工期(qi)間,應對基坑圍巖和支護系統(tong)進行動態觀(guan)測(ce),發(fa)現問(wen)題,及時處理。