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张泾河桥是亭(亭林)枫(枫泾)公路扩建工程中的一座公路桥。全长56m,是三孔预应力梁桥,主孔跨度20m。桥墩承台由2根直径120cm、孔深30m的钢筋混凝土灌注桩组成。桩端置于标高-27.8m,在第7层,草黄色砂质粉土层中。设计单桩载负值为2400～2500KN。11号桩钻进至标高-21米后,孔径从120cm改为70cm,当钻进至孔深标高-27m处发生卡钻事故,而在处理过程
Zhang Jing River Bridge Pavilion (Tinglin) Maple (Feng Jing) highway expansion project in a highway bridge. Length of 56m, is a three-hole prestressed beam bridge, the main span of 20m. Bridge pier by two 120cm diameter, hole depth of 30m reinforced concrete bored pile. The pile end is placed at a level of -27.8 m, in the 7th layer, grass yellow sandy silt layer. Design single pile carrying a negative value of 2400 ~ 2500KN. After the pile No. 11 has been drilled to a height of -21 meters, the hole diameter was changed from 120 cm to 70 cm. When drilling to a hole depth of -27 m, a stuck pipe accident occurred. In the course of the treatment