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一、长春市人工挖孔扩底灌注桩的实施情况长春市人工挖孔扩底灌注桩始于一九九三年,应用于高层或多层框架结构建筑基础,已取得了可
First, Changchun City, the implementation of artificial digging hole expanded bottom bored pile Changchun artificial digging hole expanded bottom bored pile began in 1993, used in high-rise or multi-story frame structure building foundation has been made