PROBLEM TO BE SOLVED: To prevent blockage at a joint of a gas passage and reduction in a flow passage cross section due to displacement in the horizontal direction of a checker brick.;SOLUTION: A checker brick 30 includes: a hexagonal columnar brick body 31; a plurality of gas passages 32 penetrating through the brick body 31 in the vertical direction; and a projected dowel 33 and a recessed dowel 34 provided on the upper surface or the lower surface of the brick body 31. An upper end opening 37 of the gas passage 32 on the upper surface 35 of the brick body 31 is larger than a lower end opening 38 of the gas passage 32 on the lower surface 36 of the brick body 31. When the plurality of checker bricks 30 are stacked, the projected dowel 33 and the recessed dowel 34 of the checker bricks 30 adjacent with each other in the horizontal direction are fitted, and the gas passages 32 of the checker bricks 30 adjacent with each other in the vertical direction are communicated with each other so that the upper end opening 37 of the gas passage 32 of the lower-stage checker brick 30 embraces the lower end opening 38 of the gas passage 32 of the upper-stage checker brick 30.;COPYRIGHT: (C)2012,JPO&INPIT
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