I have a requirement to conduct a tension pile load test for a test load of around 650tons. I want to know the most reliable way of tying the pile to the test beams for the pull. Recently I tried using prestressing cables for a test load of 515tons. The problem in using these is the elongation. The hydraulic jack a has limited stroke and the cables are pretty elastic. I am planning to make threads on the pile reinforcement and using bolts to make the pull. but I am not sure how to design the threads and the bolts. Can anyone help?
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