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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 >MACHINE FOUNDATION REPAIR
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MACHINE FOUNDATION REPAIR

机译：机器基础维修

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The client for this project specializes in the use of state-of-the-art technology to fabricate and assemble composites and metal-bonded structures for commercial and military aircraft programs. One of the key components for this operation at the client's plant is a highly precise computer-numerical-controlled router known as the Shoda Machine. This machine tool was installed at the plant in July 1998 for the manufacture and inspection of aircraft parts, and it is extremely sensitive to deflections. To monitor the occurrence of deflections, an internal laser system continuously checks the machine calibration. Deflections in excess of 5/1000-inch in the foundation on which the machine rests require costly periodic re-leveling and recalibration of this tool. Therefore, a significant problem arose when measured deflections during machine operation were as large as 20/1000-inch. In addition, the foundation was cracked in at least three places as a result of elastic foundation movement caused by dynamic loading as well as shrinkage and loss of base support. Deciding on a remediation procedure to alleviate or eliminate these problems involved the following important considerations: (1) achieving the client's need for reducing deflections to less than 5/1000-inch, (2) minimizing the repair cost as much as possible, and (3) reducing the time required for implementation of the foundation remediation solution. After evaluating the advantages and disadvantages of several alternatives, jet grouting was selected as the most suitable solution. The jet grouting program provided columnar elements of soilcrete to remediate the Shoda Machine foundation.
机译：该项目的客户专门使用最先进的技术来制造和组装用于商业和军用飞机项目的复合材料和金属结合结构。在客户工厂执行此操作的关键组件之一是称为Shoda Machine的高精度计算机数字控制路由器。该机床于1998年7月在工厂安装，用于制造和检查飞机零件，并且它对挠度非常敏感。为了监视偏斜的发生，内部激光系统会不断检查机器的校准情况。机器所处基础的挠度超过5/1000英寸时，需要对该工具进行昂贵的定期重新调平和重新校准。因此，当机器操作过程中测得的挠度高达20/1000英寸时，就会出现一个严重的问题。此外，由于动态载荷以及基础支撑物的收缩和损失而引起的弹性基础运动，基础至少在三个位置开裂。决定减轻或消除这些问题的补救措施涉及以下重要考虑因素：（1）满足客户需要将挠度减小到5/1000英寸以下；（2）尽可能降低维修成本，并且（ 3）减少实施基础修复解决方案所需的时间。在评估了几种替代方案的优缺点之后，选择了喷射灌浆作为最合适的解决方案。喷射灌浆程序提供了土壤混凝土的圆柱状元素，以修复Shoda Machine基础。

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