Structure for protecting sea and/or river construction work, and protective block used

Abstract

The invention relates to a structure for protecting sea and/or river construction work, which uses blocks ( 1 ) including a central core ( 2 ) having an upper portion ( 4 ) and a lower portion ( 3 ). The central core ( 2 ) is surrounded, in the lower portion thereof ( 3 ), by a circular projection ( 5 ) including side surfaces ( 9 ) and is capable of abutting, by means of at least one of the side surfaces ( 9 ), at least one of the side surfaces of a circular projection of an adjacent block.

1 . An armor layer of a protective structure for sea and/or river construction work comprising several protective blocks ( 1 ), each block having a central core ( 2 ) with an upper portion ( 4 ) and a lower portion ( 3 ), characterized in that the lower portion ( 3 ) of the central core ( 2 ) is surrounded by a circular protuberance ( 5 ) with lateral faces ( 9 ) and in that at least one of the lateral faces ( 9 ) can butt against at least one of the lateral faces of a circular protuberance of an adjacent block. 
     
     
         2 . The armor layer as claimed in  claim 1 , characterized in that the circular protuberance ( 5 ) of each block can provide partial paving of a surface with adjacent protective blocks ( 1 ) in contact with one another via at least one of the adjacent faces of the circular protuberance ( 5 ). 
     
     
         3 . The armor layer as claimed in  claim 1 , characterized in that the central core ( 2 ) of each block has a lower base ( 6 ) and an upper base ( 7 ), that are preferably flat, the lower base ( 6 ) and the upper base ( 7 ) being square or octagonal and joined by the lateral faces ( 8 ), and in that the circular protuberance ( 5 ) is arranged about the lower portion of the lateral faces ( 8 ) of the central core ( 2 ), from the lower base ( 6 ) of the central core ( 2 ). 
     
     
         4 . The armor layer as claimed in  claim 1 , characterized in that the central core ( 2 ) of each block is a square- or octagonal-based right prism. 
     
     
         5 . The armor layer as claimed in  claim 1 , characterized in that the circular protuberance ( 5 ) of each block includes an octagonal lateral contour or a square lateral contour having a notch ( 14 ) on at least one of the sides of same, the notch ( 14 ) being able to cooperate with a vertex of the square lateral contour of a circular protuberance of an adjacent block. 
     
     
         6 . The armor layer as claimed in  claim 5 , characterized in that the octagonal lateral contour of the circular protuberance of each block corresponds to a square lateral contour in which the vertexes are chamfered. 
     
     
         7 . The armor layer as claimed in  claim 1 , characterized in that the circular protuberance ( 5 ) of each block forms, with the lower base ( 6 ) of the core, a preferably flat lower surface ( 12 ) of the block ( 1 ). 
     
     
         8 . The armor layer as claimed in  claim 1 , characterized in that the circular protuberance ( 5 ) of each block also has an inclined circular surface ( 10 ) joining the upper extremity of the lateral contour of the circular protuberance ( 5 ) to the lateral faces ( 8 ) of the central core ( 2 ). 
     
     
         9 . The armor layer as claimed in  claim 1 , characterized in that the blocks ( 1 ) form partial paving covering between 60% and 90% of the surface on which the blocks are laid. 
     
     
         10 . A protective block designed to be incorporated into an armor layer of a protective structure for sea and/or river construction work as claimed in  claim 1 .