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PILE INSTALLATION & EXTRACTION OPERATIONS

机译：桩安装和提取操作

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We found the standard to be comprehensive and helpful, but it does not address the use of load moment indicators (LMI) during pile driving and extraction operations. Does A10 have guidance on this issue and are there plans to address the issue in future updates of the standard? The issue as we see it is the practice of disconnecting the LMI during pile driving. This is a common practice allowed by OSHA. We do not see a significant exposure with this as the weights of the hammer, leads and piles can be easily determined by calculation, name plates, manufacturer's literature, weighing and other factors. Perhaps the overall concern is with pile extraction regardless of the extraction technique. We believe a technical issue is the additional and unknown extraction force over and above the weight of the pile and extraction hammer required to extract a pile itself. A rule of thumb for our organization when using a vibratory extraction hammer is that the extraction force should be approximately two to four times the combined weight of the pile and hammer (Warrington, 2011).
机译：我们发现标准是全面且有用的，但它在桩驾驶和提取操作期间没有解决负载力矩指标（LMI）的使用。 A10是否有关于此问题的指导，并计划在该标准的未来更新中解决问题？我们看到的问题是在桩驾驶期间断开LMI的实践。这是OSHA允许的常见做法。我们没有看到这一点的显着暴露，因为锤子，引线和桩的重量可以通过计算，名称板，制造商的文献，称重和其他因素轻松确定。也许整体关注是用桩萃取，无论提取技术如何。我们认为技术问题是桩和提取锤子的额外和未知的提取力，提取桩本身。当使用振动提取锤时，我们组织的经验法则是，提取力应大约是桩和锤子（Warrington，2011）的组合重量的两到四倍。

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