Boston-Senkbrunnenm, Gow-Senkbrunnen ● Gow caisson, Boston caisson, caisson pile [ 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 or silt which is then excavated within it until the clay or silt in the bottom begin 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 The shaft is then filled with concrete and the steel tubes withdrawn as the concrete rises to their level. The excavation is belled out at the base.] ...
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- Boston-Senkbrunnen m
- Springer Berlin Heidelberg