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【单选题】
关于沉管扩夯灌注桩施工的说法,不正确的是( )A.
如有地下水或渗水,沉管过程中可采用干硬性混凝土对外管封底。
B.
桩身混凝土宜一次浇筑到位;拔内夯桩锤施压管中的混凝土顶面,边压边拔。
C.
工程施工前进行试成桩,详细记录混凝土的施工情况,作为施工控制依据。
D.
扩夯的目的是增加混凝土桩与土层的摩擦力,从而增加地基承载力。
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