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Page 20 of 22 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Trench Shield <br /> <br /> <br />Soil Types <br />Trench shields (also called Trench Boxes or Trench Sheets) are steel or aluminum structures <br />used for protecting utility workers while performing their duties within a trench and avoid <br />cave-ins. They are customarily constructed with sidewalls of varying thicknesses held apart by <br />steel or aluminum spreaders.