北京“前三门”高层建筑工程采用钻孔灌注桩基础(以下简称钻灌桩基)的共21栋。另有6栋采用预制混凝土桩基,有8栋采用满堂箱基。北京市以往在多层住宅工程中,用过φ30厘米的钻灌桩基,取得了比深埋条形基础优越的技术经济效果。“前三门”高层建筑地面以上一般有10～15层,地面以下都有地下室。从1976年春到现在,中间经过严冬和暴雨,特别是经过唐山大地震的波及,钻灌桩基收到了实效,受到了欢迎。 A total of 21 buildings with drilled cast-in-place pile foundations (hereinafter referred to as drilling and pile foundations) were used in Beijing’s “three first-door” high-rise building projects. Another six buildings use prefabricated concrete pile foundations, and eight have full-filled box foundations. In the past, in the multi-story housing project in Beijing, the φ30 cm drilled pile foundation was used to obtain a superior technical and economic effect compared with the deep-buried bar-shaped foundation. The top three high-rise buildings generally have 10 to 15 floors above the ground, and there are basements below the ground. From the spring of 1976 to the present, after the severe winter and heavy rain in the middle, especially after the Tangshan earthquake, the drilling and pile foundation received practical results and was welcomed.