目前挖孔桩一般是实心桩,1975年我处七队在技柳线黑岩溪大桥1号及10号墩现灌空心柱桩试验成功。实心桩设计外径为150厘米,空心桩外径不变,不增加主筋和构造筋,内径为100厘米,壁厚25厘米,空心部位节省混凝土45％。设备简单,操作方便,效果良好,达到省工、省料、进度快的目的, 现将模板结构,施工方法及使用效果介绍如下。 At present, the hole-digging pile is generally a solid pile. In 1975, the seven teams at the Yanliu line Black Rock Creek Bridge No. 1 and No. 10 pier were successfully perfusion hollow pillars. Solid pile design outer diameter of 150 cm, the hollow pile diameter unchanged, not to increase the main tendons and structural ribs, an inner diameter of 100 cm, wall thickness of 25 cm, 45% of the hollow parts to save concrete. Equipment is simple, easy to operate, the effect is good, to save labor, save material, the goal of fast progress, now the template structure, construction methods and the use of effects are as follows.