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根据８ 个上海软弱地基的超长钻孔灌注桩工程项目的施工技术资料， 总结了超长桩的概念、施工难度和施工方法。
According to the technical data of the 8 long bored cast-in-place piles for soft foundations in Shanghai, the concept of ultra-long piles, construction difficulty and construction methods are summarized.