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鋼板樁施(shi)工(gong)(gong)(gong)關系到施(shi)工(gong)(gong)(gong)支護和安(an)全,是工(gong)(gong)(gong)程施(shi)工(gong)(gong)(gong)關鍵(jian)的工(gong)(gong)(gong)序之一,在施(shi)工(gong)(gong)(gong)中要(yao)注意以下施(shi)工(gong)(gong)(gong)技術要(yao)求:
(1)確定定樁位(wei),按順序每隔1m標明鋼板樁的具(ju)體(ti)樁位(wei),灑灰(hui)線或噴漆標明。
(2)鋼板(ban)樁施(shi)打前一定要熟(shu)悉地下管線(xian)、構(gou)筑物(wu)的情(qing)況,認真放出準(zhun)確(que)的支護樁中線(xian)。
(3)打樁前(qian),對鋼管(guan)、鋼板樁逐(zhu)根檢查,剔(ti)除(chu)變(bian)形嚴(yan)重的鋼管(guan)、鋼板樁,不合(he)格(ge)者待修整(zheng)后才可使用。
(4)在插打過程中隨(sui)時測(ce)量監控(kong)每塊樁的斜度不(bu)超過2%,當偏(pian)斜過大不(bu)能用拉(la)齊方法調正時,拔起(qi)重(zhong)打。
(5)鋼板樁(zhuang)沉樁(zhuang)施(shi)工(gong)前先進行試(shi)樁(zhuang),試(shi)樁(zhuang)鋼管數量不小于10根(gen)。
(6)鋼(gang)板樁(zhuang)放線施工時,樁(zhuang)頭就位必須正(zheng)確、垂直。沉樁(zhuang)過程中,隨時檢測,發(fa)現問題,及時處理。沉樁(zhuang)容許偏(pian)差為平(ping)面位置縱向(xiang)100 mm,橫向(xiang)為-50~0mm,斜(xie)度不超過2%。
(7)基坑開挖后鋼板樁須垂直(zhi)平(ping)順,無嚴重扭(niu)曲、傾斜和劈裂現(xian)象。
(8)沉樁施前(qian)必須(xu)平整、清除地(di)(di)下、地(di)(di)面及高(gao)空障礙(ai)物,需保留的地(di)(di)下管線應挖露出(chu)來,加以保護(hu)。
(9)基(ji)坑(keng)土方和結構施工期(qi)間,應對基(ji)坑(keng)圍巖和支護系統進行動態(tai)觀測,發現問題(ti),及時(shi)處理。