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首页> 外文会议>Deep Foundations Institute 28th Annual Conference on Deep Foundations: Deep Foundations in Compressible Soil and Soft Rock >Post Grouted Drilled Shafts: A Case History of The PGA Boulevard Bridge Project
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Post Grouted Drilled Shafts: A Case History of The PGA Boulevard Bridge Project

机译：灌浆后钻孔轴：PGA林荫大道大桥项目的案例

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摘要

A post grouted drilled shaft foundation system was successfully used in place of the specified driven pile foundation system as a Value Engineering Cost Proposal (VECP) for the new PGA Boulevard Grade Separation Project. Pressure grouting the cohesionless sandy soils at the drilled shaft base significantly increased the end bearing capacity and stiffness allowing drilled shafts to be the more cost effective foundation system. The post grouted drilled shaft option also provided other benefits including reducing owners risk normally associated with pile driving vibrations and offered a high level of quality assurance for the drilled shafts. This paper discusses the implementation of post grouted drilled shafts from design to completion of construction. A design procedure for post grouted drilled shafts developed by the University of South Florida was used for initial VECP evaluation. Prior to construction, two instrumented test shafts were installed and load tested, one of which was post grouted. Therein, the design procedure was calibrated, tip elevations for production shafts were refined, drilled shaft construction and grouting procedures were demonstrated, and a grouting criteria was developed for the project.
机译：后注浆钻孔竖井基础系统已成功用于新的PGA Boulevard等级分离项目的价值工程成本提案（VECP），代替了指定的打桩基础。在钻探的井筒底部压力灌浆无粘性砂土，显着提高了端部承载能力和刚度，使钻探的井筒成为更具成本效益的基础系统。后注浆钻孔轴选件还提供了其他好处，包括减少通常与打桩振动相关的所有者风险，并为钻孔轴提供了高水平的质量保证。本文讨论了从设计到施工完成后注浆钻孔井的实施。南佛罗里达大学开发的后注浆钻杆的设计程序用于初始VECP评估。在施工之前，先安装了两个仪器测试轴并进行了载荷测试，其中之一进行了后灌浆。其中，对设计程序进行了校准，对生产井筒的顶部标高进行了细化，对钻探井筒的构造和灌浆程序进行了演示，并为该项目制定了灌浆标准。

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