在泥浆护壁成孔灌注桩施工中,正确的做法有
A.钻机就位时,钻头对准护筒中心
B.护筒中泥浆应高出地下水位Im以上
C.清孔后,保证孔底沉渣不超过150mm
D.混凝土灌注完成后方可提升导管
E.每根灌注桩灌注混凝土至桩顶时应略低于桩顶设计标高
正确答案是AB
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