我省地处江汉平原,软卧层较深,在修理大、中型桥梁时,常常需要作深基础。一九六五年以前,我们都是用沉井或打入式桩作深基础,这种基础所需机械设备较多,材料耗用量较大,施工进度较慢,从而使桥梁造价提高。从一九六五年起,引入了外省的经验,开始采用钻孔灌注桩作桥梁基础。几年来,据不完全统计,已有15,000m的桥梁采用了钻孔灌注桩 The province is located in the Jianghan Plain, a deep soft layer, when repairing large and medium-sized bridges, often need to make a deep foundation. Before 1965, we all used deep caisson or driven piles as the deep foundation, which required more mechanical equipment, more material consumption and slower construction so as to make the bridge cost more. Since 1965, the experience of other provinces has been introduced and the use of bored piles as a bridge foundation has started. Over the past few years, according to incomplete statistics, bored piles have been used for 15,000m of bridges