最近几年来,在贝加尔—阿穆尔干线建造中,对于小桥,广泛采用直径80cm钢筋混凝土管柱并在桩顶用帽梁注①联结的柱式桥墩。管柱插入预先钻成的直径1m的孔内,并在钻孔下部灌注水泥砂浆(图1),砂浆是在孔底拌 In recent years, in the construction of the Baikal-Amur Main Line, for small bridges, column piers with a diameter of 80 cm and reinforced concrete columns are widely used and bolted to the top of the pile. The pipe string is inserted into a pre-drilled hole of 1 m in diameter, and a cement mortar is poured into the lower part of the borehole (FIG. 1). The mortar is mixed at the bottom of the hole