| 摘要 |
PROBLEM TO BE SOLVED: To facilitate a combination, and to increase joining strength by forming a groove strip on a surface and a projecting strip on a surface among upper/lower surfaces, and forming a groove strip on a surface and a projecting strip on a surface among both side surfaces. SOLUTION: An upper surface groove strip 15 and a side surface groove strip 18 are formed as a U-shaped groove strip, and an under surface projecting strip 16 and a side surface projecting strip 17 are formed as a crest-shaped projecting strip. A combination is formed by meshing of a groove strip 15 or 18 of one formed product 10 and a projecting strip 16 or 17 of the other formed product 10, and in a heaping-up construction method, crushed stones are backfilled with respective stages by the combination without requiring backfilling concrete. Thus, since heaping-up work and sticking work can be performed only by meshing and combining the groove strip and the projecting strip of the each formed product 10, execution work can be quickly performed, and joining of the formed product 10 is very strong to contribute to solving an environmental problem and providing a beautiful appearance without requiring a backfilling material.
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