| 摘要 |
A block (1) comprises a body having upper and lower faces (3, 4) and side faces (2) which are arranged to provide the body with a generally regular polygonal section, e.g. as shown a square section. Each of the faces (3, 4 and 2) is provided with an opening (5, 10, 9) communicating with an internal void (12). The openings (9) in the side faces (2) extend to the lower face to define with the opening (10) in the lower face (4) and the void (12) leg-like projections (11) by which the body is supported on the surface (e.g. a breakwater) to be protected thereby. As shown, the void (12) may be generally frusto-conical and the openings (5,10,9) may taper in the direction of the void (12), to facilitate construction. The body may be made of concrete or a suitable plastics material with a massive filler and a plurality of such bodies are arranged in a regular array to form a protective layer on the surface to be protected thereby. <IMAGE> |
