| 摘要 |
PURPOSE:To allow a steady burning for a time span required for keeping warm and curing concrete by shaping a hollow cylinder in such a manner that multiple briquets therein are stacked so as to form a wedge-shaped gap between their opposing bottom and top. CONSTITUTION:The inner diameter of an inner cylinder 2 which is bent at its vertical center is made slightly larger than the diameter of briquets, and briquets 4 and 5 are placed therein. As the bottom of the upper briquet 4 and the top of the lower briquet 5 are in contact with each other at their one side only, a wedge-shaped gap 7 is formed inbetween. When the ignition or starter layer at the top of the briquet 4 is ignited, and the burning of the upper briquet 4 moves on downward, the ignition or starter layer of the briquet 5 underneath catches fire. As the wedge-shaped gap 7 between the bottom of the briquet 4 and the top of the briquet 5 acts as a burning chamber to supply air needed for burning, the transfer of burning to the underneath briquet 5 can be made steadily without causing incomplete burning.
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