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近几年来苏联第一桥梁工程公司广泛采用了无承台的桥墩。钻孔技术的发展对这一工程的实现起到了促进作用。目前,钻孔直径可达1.7米,在不同强度的土层内
In recent years, the first bridge engineering company in the Soviet Union adopted a wide range of piers. The development of drilling technology has played a catalytic role in the realization of this project. At present, the diameter of the drill hole can reach 1.7 meters, in different strength of the soil layer