PAVEMENT STRUCTURE IN SIDEWALK

摘要

PROBLEM TO BE SOLVED: To provide a pavement structure in a sidewalk which stores rainwater which has fallen on the pavement below the surface course for efficient use. SOLUTION: An impervious sheet 15 is laid to form a recessed shape between the subgrade and the base course 17 and a granular material 16 is filled in the recessed part to show 30% or more in aggregate porosity and form a base course 17 provided with a strength having 30 or more in a modified CBR and 1×10-1 cm/sec in permeability coefficient. Further, a nonwoven fabric 18 is laid on the surface of the base course 17 and sand cushion is laid and then, water permeable blocks 20 having 1×10-2 cm/sec or more in permeability coefficient to form a surface course 27. Rainwater which has passed through the surface course 27 and penetrated to the lower side is stored in a recessed rainwater storage tank 21 filled with the granular material 16.