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Foundation Design and Construction Challenges of 100-Year Old Saugus River Railroad Bridge Emergency Rehabilitation

机译：百年桑格斯河铁路大桥紧急修复的基础设计和施工挑战

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The 100 year old Massachusetts Bay Transportation Authority (MBTA) Saugus Drawbridge is located near themouth of the Saugus River north of Boston Harbor in Saugus, Massachusetts. The severe degradation of thesupport at Bascule span Rest Pier (Pier 6) of the Bridge required a temporary rehabilitation to ensure the safetyof traffic crossing the structure until the MBTA can replace it with a new permanent structure. This paperpresents a case history that covers the planning and construction of a Temporary Pier Bent to improve load ratingof the bridge.This paper presents details of the comprehensive investigation undertaken to determine the condition of theconcerned rest pier and its suitability to support the required loads. The techniques incorporated to diagnose thestructural health of the pier utilizing field instrumentation. A summary of the suggested remedial measures areoutlined along with some of the surprises that came to light during construction. Planning for the construction ofa temporary pile bent foundation, selection of the pile type for the temporary pile bent, and the adequacy of thepile installation method selected during the design phase is evaluated based on the results of the fieldinstrumentation. This paper also discusses the theory of ground motion and vibration due to pile installation andits applications in the development of the foundation construction plans. Finally, recommendations with regard tothe planning and construction of foundations where limited information is available and pile installation mustoccur in close proximity to adjacent structures are presented.
机译：拥有100年历史的马萨诸塞湾运输管理局（MBTA）索格斯吊桥位于 马萨诸塞州萨格斯市波士顿港以北的萨格斯河河口。严重退化 桥的Bascul span span Rest Pier（Pier 6）的支撑需要临时修复以确保安全 穿越该结构的流量，直到MBTA可以用新的永久结构替换它。这篇报告 介绍了一个案例历史，涵盖了临时码头弯曲的规划和建设，以提高额定载荷 桥的。 本文介绍了确定病情的综合调查的详细资料。 有关的休息墩及其是否适合支撑所需的载荷。用于诊断疾病的技术 利用现场仪表对码头的结构健康进行评估。建议的补救措施摘要如下： 概述以及在施工过程中发现的一些惊喜。规划建设 临时桩弯曲的基础，临时桩弯曲的桩类型的选择以及 根据现场结果评估在设计阶段选择的桩安装方法 仪器。本文还讨论了由于桩安装和安装引起的地震动和振动的理论。 其在基础建设计划制定中的应用。最后，关于 可获得有限信息且必须进行桩安装的基础的规划和建设 出现在紧邻相邻结构的地方。

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