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钻孔灌注桩的护筒入土深度究竟多少为宜,尤其是在深水钻孔和有潮汐影响水位经常变化的钻孔,这还是一个新的技术课题。一般情况下的钻孔的护筒入土深度,是指河滩水深在2.0米以内的情况下,其护筒入土深度可在1.5～2.5米范围之内。至于深水钻孔的护筒入土深度以多少为好,我们根据多年的施工经验和田庄台辽河大桥的实践,提出一个对深水钻孔护筒入土深度的估算公式。
It is also a new technical issue whether the depth of bored piles into soil should be more or less appropriate, especially in deep-water boreholes and boreholes that have tidal changes frequently affected by tides. Under normal circumstances, the penetration depth of the casing of the borehole refers to the depth of the riverbank within 2.0m, the depth of which can be in the range of 1.5-2.5m. As for the depth of deepwater casing casing as much as possible, we based on years of construction experience and practice of Tianzhuo Liaohe River Bridge, a deepwater drilling casing into the soil depth estimation formula.