| 摘要 |
PROBLEM TO BE SOLVED: To provide a connection part of grid-like frame body having the more simple structure in comparison with the conventional one and facilitated in connection thereof, and to provide a coupling tool having the strong structure. SOLUTION: Cast iron grid-like flat frames 1 formed into grid-shape are provided, and connected to each other so as to form a frame body, and inside of this frame body is filled with crashed stone and stones. At the time of connecting adjacent flat frames forming cage frames to each other, each vertical band 1a of the outer peripheral part of the flat frame 1 is provided with lock projections A in parallel with the vertical band in both of a surface and a back surface of the vertical band at the center and at symmetrical positions in relation to the center in the longitudinal direction of the vertical band, and stopper projections B respectively crossing at right angle with the lock projection A are provided at a central part in the longitudinal direction of the lock projections A. The flat frames 1 are connected to each other by coupling tool 2 having plural nearly T-shaped recessed grooves capable of being inserted into the lock projections formed at a part of the vertical band of the peripheral part and in both the surface and the back surface of the vertical band.
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