Road or paving block element uses height-offset function faces on adjoining rocks to key together when laid possibly assisted by bevelled faces to form flat going.

摘要

Projections on diagonally opposite corners of the block have function faces (4) offset in height relative those in the complementary block so as to mate when laid. The basic block comes in the form of two blocks (2,3) diagonally offset in relation to one another, the function faces possibly bevelled in parallel or alternatively shaped to give positive fitting. The function or bearing faces are also locally thickened, again for keying between adjacent blocks once in place. The function faces of adjacent blocks should be spaced or again are laid to leave sand-filled joins.