A series of measures such as open caisson, thickening protective wall and decreasing length, etc. are taken to overcome problems of sand drafting, collapse and water gushing, which get better effect.
施工中采用沉井法、增加护壁厚度、减小长度等一系列措施，克服了流砂、坍孔、涌水等难点，取得了较好的效果。
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