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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 >SUWANNEE AMERICAN CEMENT PLANT, BRANFORD, FLORIDA: A Case Study of Large Diameter Continuous Flight Auger Design Build Foundations
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SUWANNEE AMERICAN CEMENT PLANT, BRANFORD, FLORIDA: A Case Study of Large Diameter Continuous Flight Auger Design Build Foundations

机译：佛罗里达州布兰福德的SUWANNEE美国水泥厂：以大直径连续螺旋钻设计建造基础为例

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摘要

`This paper presents a case study of large diameter continuous flight auger (CFA) piles and drilled shafts utilized for foundation support of a series of heavily loaded cement plant structures at the Suwannee American Cement (SAC) Plant in Branford, Florida. The high loads and exacting total and differential settlement criteria when combined with a highly variable subsurface geology provided a challenging design scenario. Fully instrumented static pile load tests were performed to determine design parameters in the variable weathered limestone bedrock. Ultimate side friction values ranged from 2 to 8 tsf within the limestone, resulting in the requirement for CFA piles up to one meter (approximately 40 inches) in diameter and socket lengths of up to 40 feet. At several localized areas, the limestone bedrock was in excess of 60 feet below grade, requiring the use of cased drilled shafts to depths on the order of 80 to 90 feet. An integral part of the production pile installation was the use of instrumentation to monitor drilling and concreting parameters. Calibration of drill rates, torque and auger rotation with rock quality was performed to allow monitoring of the soil stratigraphy at each pile location. When combined with the results of the instrumented load testing, the monitoring of drilling parameters allowed confirmation that sufficient socket length was achieved within the quality of rock present at each and every pile location.
机译：This本文介绍了一个大直径连续螺旋钻（CFA）桩和钻杆的案例研究，该桩用于佛罗里达州布兰福德的Suwannee American Cement（SAC）工厂的一系列重载水泥厂结构的基础支撑。高负荷以及严格的总和差异沉降标准，再加上高度变化的地下地质条件，提供了具有挑战性的设计方案。进行了完全仪器化的静态桩载荷测试，以确定风化石灰岩基岩中的设计参数。石灰石内部的极限侧摩擦值范围为2到8 tsf，导致CFA桩的直径要求达到一米（约40英寸），承窝长度必须达到40英尺。在几个局部地区，石灰岩基岩高度超过了60英尺，需要使用套管式钻探井，深度约为80至90英尺。生产桩安装中不可或缺的一部分是使用仪器监控钻井和混凝土参数。对钻速，扭矩和螺旋钻旋转进行岩石质量校准，以监测每个桩位置的土壤地层。当与仪器化的载荷测试结果结合在一起时，对钻孔参数的监控可以确认在每个桩位处存在的岩石质量范围内都可以实现足够的承窝长度。

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