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| 1. |
Casing pipe is correctly positioned. |
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| 2. |
Casing pipe is driven into the ground using a vibro-hammer. |
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| 3. |
When it reaches the required depth, the casing pipe is charged with a specified volume of sand. |
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| 4. |
As the casing pipe is raised by a specified margin, the sand is discharged into the ground using compressed air. |
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| 5. |
The sand pile is compacted and enlarged by driving the pipe back down into the sand. |
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| 6. |
The pipe-raising, sand discharge and re-driving procedure is repeated numerous times as the pipe is gradually removed, forming a complete compacted sand pile. |
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