| 摘要 |
<p>A paving block is made up, as seen in plan, of two connected portions (10, 12) one portion (10) comprising four connected substantially identical quadrants (14-17) and the other portion (12) having an inside-out pillow shape defined substantially by four arcuate surfaces. The curvature of each surface is substantially the same as that of the curved boundary of any one of the quadrants (14-17). Such a block may have various proportions, and may be made to various dimensions. However it is preferred for the blocks to be of such a size and weight that one can readily be held in one hand. This simplifies and makes less expensive the process of laying the blocks. Such blocks when laid have improved structural stability.</p> |
