| 摘要 |
The method comprises excavating the soil at the lower end of the shell to an extent larger than the shell in its cross-section, for forming an enlarged base. The method then involves forcing a second charge of concrete through a pressurising tube, the open end of which is extended to the lower end of the excavated portion. This allows for penetrating the second charge of concrete into the region surrounding the base and the shell after a first charge of concrete fills and sets in the excavated portion and the shell.
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