Construction of the drilled shafts for the Brightman Street Bridge Replacement Project were not only challenging due to working over the water but were also challenged by changed soil conditions, concurrent work being performed by an adjacent contractor on the same project, environmental restrictions and severe winter conditions. A total of 36 x 8 feet diameter drilled shafts with 7.5 feet rock sockets were installed for the East and West bascule piers. This project also included Osterberg Cell load testing on two production drilled shafts at each the East and West bascule piers. The results from the load test program were used to fine tune the design of the drilled shaft rock sockets. From a constructability standpoint the reverse circulation drilling method with a pile top drill rig proved to be an excellent choice for drilling the overburden and rock sockets of the large diameter deep drilled shafts.
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机译：钻井轴为Brightman街道桥置换项目的构造不仅是由于在水上工作而挑战，而且也受到改变的土壤条件，并经常由相邻的承包商在同一项目，环境限制和严重的冬季条件下进行的并行工作 。 为东部和西部桥墩安装了总共36 x 8英尺直径的钻孔轴，有7.5英尺的岩石插座。 该项目还包括Osterberg Cell负载测试在每个东西和西斜底胶上的两个生产钻井上。 负载测试程序的结果用于微调钻孔岩插座的设计。 从构造性的角度来看，具有桩顶钻机的反向循环钻探方法证明是钻出大直径深钻井轴的覆盖层和岩石插座的绝佳选择。
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