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Annular slats of angled mirrors can reflect sunlight from one set of mirrors to the next.
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The annular space between each pile and the clay will be filled with low-strength material only after the hydraulic jacking operation is complete.
The uppermost section of the annular space is permanently sealed, usually with cement grout.
Once both the casing and screen are installed, the annular space between them and the bore hole must be filled.
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