Twin block concrete sleeper has reinforcements which protrude partially from it, additional concrete blocks being cast around protruding sections before sleeper is anchored in place by embedding in concrete

摘要

The twin block (2,3) concrete sleeper has reinforcements (4) which protrude partially from the concrete. Additional concrete blocks (7) are cast around the protruding sections when the sleeper is placed on the load bearing surface (5) before it is anchored in place by embedding it in concrete.