Form block set for road surfaces comprises equally legged trapezoidal blocks, with length of parallel head edges of one of each trapezoidal block equal to length of parallel foot edges of next largest trapezoidal block

摘要

The form block set for road surfaces comprises equally legged trapezoidal blocks, with the length of parallel head edges of one of each trapezoidal block equal to the length of the parallel foot edges of the next largest trapezoidal block. The last trapezoidal block on its head edge (5) is enlarged to the form block (4) by an equally legged trapezium (6) with smaller head edge (7). All form block (1,2,3,4) of the set have all-round rotation-symmetrical forward projections and backward projections. A tooth can be so formed on a forward projection that groups of teeth located at a distance from each other are available on the outsides.