自从1965年钢筋混凝土灌注桩(下称灌注桩)技术鉴定会议召开以来,十多年间灌注桩桥墩在交通和水利部门都获有较大的发展和推广。目前,在桥墩的方案比较中,灌注桩桥墩已成为首先考虑的几种型式之一。实践证明,它与重力式桥墩相比有不少优点。例如,重力式桥墩必须在已开挖未放水的河道中或在两头打坝并排水干净后的天然河床中才能清基浇筑,施工期长,造价高。灌注桩桥墩就不然,它可以在未开挖的河道上先行施工或在有水的河道上进行水下浇灌。这样就赢得了时间,在河道开挖后施工队伍可立即架桥,因而缩短了 Since the meeting of technical appraisal of reinforced concrete bored pile (hereinafter referred to as bored pile) in 1965, the pier and bored piles have been greatly developed and popularized in the transportation and water conservancy sectors for more than ten years. At present, compared with the scheme of piers, piled piers have become one of the first types to be considered. Practice has proved that it has many advantages compared with the gravity pier. For example, gravity piers must be poured into a natural river bed that has been dredged and not drained, or dumped into a dams and drained clean. The construction period is long and the cost is high. Pouring pile piers, on the other hand, can be carried out either on un-dugged channels or under water-filled channels. This has won the time, the construction team can be immediately bridged after the excavation of the river, thus shortening