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长期以来,震动打桩机与桩或钢筋混凝土管柱是用带螺栓的桩帽联结的。实践表明,这种桩帽在结构上和使用上均有缺点。同时,桩帽与被下沉的构件用螺栓联结——劳动量大,花时间多,并使震动打桩机和为它服务的吊机停歇时间长,从而增加了施工成木。此外,桩帽法兰盘与管柱法兰盘之间的缝隙常使联结的螺栓断裂。苏联运输建筑刊研所在1965一1966年试制和采用一种置于方拉和直径0.4ot天川.6ry的旋
For a long time, vibrating pile drivers and piles or reinforced concrete columns were bolted to pile caps. Practice shows that the pile cap in the structure and use of both shortcomings. At the same time, the pile cap is bolted to the sunken part - labor-intensive and time-consuming, and long periods of time spent on the vibrating pile-driver and the cranes servicing it, increasing the work-in-progress. In addition, the gap between the cap flange and the column flange often ruptures the associated bolt. Soviet Transport Construction Research Institute in 1965-1966 trial production and use of a placed square pull and diameter 0.4ot Tianchuan .6ry spin