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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 >HELICAL PILES WITH GROUTED SHAFTS - A PRACTICAL OVERVIEW
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HELICAL PILES WITH GROUTED SHAFTS - A PRACTICAL OVERVIEW

机译：带有倾斜轴的螺旋桩-实用概述

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摘要

Helical screw piles are used in various applications including the underpinning of distressed foundations and as deep foundations for new structures. At present, maximum design loads range between 12.5 and 50 tons. Helical piles installed with in-situ grouting of the central steel shaft are a relatively new type of deep foundation, which have extended the present maximum design loads to the 100-ton range. Vickars & Clemence discussed this new foundation system in a paper presented at GEO-Denver 2000 in Denver, CO. Over the past three years, grouted shaft helicals have been used successfully on remedial and new construction projects all across North America. The authors have studied several construction projects in a variety of soil conditions to compile a list of practical design guidelines. Those guidelines include installability of grouted shaft helicals based on soil type, equipment requirements, grout selection, and theoretical vs. actual load capacity. In a number of cases, full-scale, field load tests were conducted in both granular and cohesive soils and the results broken down between tip resistance on the helix bearing plates and friction resistance on the grouted shaft. Data is presented which will further efforts to develop a design model and method to accurately predict the axial and lateral capacity of grouted shaft helicals.
机译：螺旋螺旋桩可用于各种应用，包括不良基础的支撑和新结构的深层基础。目前，最大设计载荷在12.5吨至50吨之间。中心钢轴现场注浆安装的螺旋桩是一种相对较新的深层基础，将目前的最大设计载荷扩展到100吨范围。 Vickars＆Clemence在美国科罗拉多州丹佛市的GEO-Denver 2000年发表的一篇论文中讨论了这种新的地基系统。在过去的三年中，灌浆的竖井螺旋已成功地用于整个北美的补救和新建项目。作者研究了在各种土壤条件下的几个建设项目，以编制出一系列实用的设计准则。这些准则包括根据土壤类型，设备要求，灌浆选择以及理论载荷与实际载荷能力而确定的灌浆轴螺旋桨的可安装性。在许多情况下，在颗粒状和粘性土中都进行了全面的现场载荷测试，结果在螺旋轴承板上的尖端阻力和灌浆轴上的摩擦阻力之间被分解了。提出了数据，这些数据将进一步致力于开发一种设计模型和方法，以准确预测灌浆的轴螺旋的轴向和侧向承载力。

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