| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent ground-buried structures buried in the ground just under a road, such as compact cable boxes (hereinafter referred to as C. C. BOX), from being cut off by mistake by a concrete cutter, etc., in the event of road repair work. SOLUTION: In order to protect ground-buried structures 4 buried in the ground just under a road, this ground-buried structure protection board comprises relatively soft plate-shaped base steel plates 6 and oblong rectangular- shaped block steel plates 7 having the same quality as the base steel plates 6 and combined into a picture-frame shape of the same shape as these base steel plates 6, the relatively soft plate-shaped base steel plates 6 and a picture- frame shaped material, into which the rectangular-shaped block steel plates 7 having the same quality as the base steel plates 6 are combined along edges of an upper surface of these base steel plates 6, are disposed the former upon the latter or vice versa, and an earth/sand layer 9 and a concrete layer 10 are formed thereon.</p> |
