| 摘要 |
A paving structure ( 11 ) of the type having an upper wear layer ( 12 ) and an underlying sub-base layer ( 15 ) of rigid insoluble hard particulate material forming voids for the collection of water permeating through the permeable surface where layer ( 12 ) has an intermediate reinforcing grid ( 16 ) located at an intermediate level of the sub-base layer ( 15 ) such that it is covered by an upper part of the sub-base layer ( 15 U) which is of a thickness not less than 1½ times the dimension of the largest particles in that part of the sub-base layer. A reinforcing grid ( 26 ) at the base of the sub-base layer between this and the sub grade ( 18 ) may also be provided.
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