In-situ concrete piling or underground walling involves sinking hollow body of required pile contour to take integrated pipes with screw conveyor using rotation and feed drives from head end.

摘要

A pipe (R) or several pipes integrated in a hollow body (H) of rectangular, square, circular or tee shape accepts a screw conveyor (ES) or several such and one or more guide plates (L) to close areas not covered by the screw blade and which would otherwise interrupt flow. In this way, as the body and pipes and screw are sunk so the bottom ground necessarily flows towards the screw center. One pipe should be longer at its bottom end to take the screw conveyor. The screws are sunk vertically and loaded by rotation (D) and feed (V) drives separately. The screw blade arrangement and pitch as also the core pipe (SR) are so adapted to the pipes (R) integrated in the body (H) that the blade diameter matches the inside diameter of the pipe (R) to ensure spoil recovery. Feed and vibration energy is supplied from the top end of the hollow body (H).