Hollow brick with holding ribs

Abstract

A hollow brick includes a bottom wall, two side walls projecting from the bottom wall, a plurality of intermediate walls projecting from the bottom wall between the side walls, and a top wall opposite to the bottom wall and connecting the side walls and the intermediate walls. A plurality of ventilation holes is bounded by the bottom wall, the side walls, the intermediate walls and the top wall. Each ventilation hole has two ventilation open ends opposite to each other along the transverse sides of the bottom wall. Two outer holding ribs projects respectively from outer surfaces of the side walls in opposite outward directions.

What is claimed is: 
     
         1 . A hollow brick, comprising:
 a bottom wall having two opposite longitudinal sides and two opposite transverse sides connected between said longitudinal sides;   two side walls respectively and upwardly projecting from two opposite transverse sides of said bottom wall;   a plurality of intermediate walls projecting upwardly from said bottom wall between said side walls and spaced apart along a direction parallel with said longitudinal sides of said bottom wall;   a top wall opposite to said bottom wall and connecting said side walls and said intermediate walls;   a plurality of ventilation holes bounded by said bottom wall, said side walls, said intermediate walls and said top wall, each of said ventilation holes having two ventilation open ends opposite to each other along a line parallel with said transverse sides of said bottom wall; and   two outer holding ribs projecting respectively from outer surfaces of said side walls in opposite outward directions.   
     
     
         2 . The hollow brick as claim in  claim 1 , further comprising two outer flanges which respectively project in opposite outward directions from said outer surfaces of said side walls at a level above said outer holding ribs, said outer holding ribs and said outer flanges being proximal to said top wall. 
     
     
         3 . The hollow brick as claim in  claim 1 , wherein the number of said intermediate walls is two, and the number of said ventilation holes is three. 
     
     
         4 . The hollow brick as claimed in  claim 1 , further comprising two inner holding ribs respectively disposed in two of said ventilation holes respectively proximal to said side walls, each of said inner holding ribs projecting from one of said intermediate walls toward an adjacent one of said side walls. 
     
     
         5 . The hollow brick as claimed in  claim 4 , wherein each of said inner holding ribs has a joining end fixed to said one of said intermediate walls, and a free end opposite to said joining end and spaced apart from said adjacent one of said side walls. 
     
     
         6 . The hollow brick as claimed in  claim 4 , wherein each of said inner holding ribs has two joining ends respectively fixed to said one of said intermediate walls and said adjacent one of said side walls.