Improvements in or relating to artificial blocks for building structures exposed to the action of moving water

摘要

833,920. Sub-aqueous walls. ETABLISSEMENTS NEYRPIC. Aug. 8, 1958, No. 25591/58. Class 68(2) A concrete block for use in building structures subject to the action of moving water comprises a central zone from which project four legs L making equal angles with one another and separated by the recesses P. The half angle a is between 9 and 14 degrees and the ratio of length b to base c is between 0.85 and 1.15 and is preferably 1. When used to construct a revetment the thickness of the facing is 2.4 ¸ hSP2/SP where h is the height of the block in metres and the slope angle of the wall is 33-45 degrees. When used to construct a mound the number of blocks used is 1.8 ¸ hSP3/SP, the side slope is 45 degrees and the void percentage is 50. Specification 683,360 is referred to.