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5837. Caisson pile or Cow caisson, Boston caisson : A device for sinking small shafts through soft clay or silt to prevent excessive loss of ground. A short cylinder of steel plate is driven into the clay that is then excavated within it until the clay in the bottom begins to heave. Another short cylinder of slightly smaller diameter is then driven inside the first and so on until the shaft reaches firm ground. The shaft is then filled with concrete and the steel tubes withdrawn as the concrete rises to their level.

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