| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to locate an embedded box with accuracy even if it is concealed by concrete by forming an index in the center of a surface. SOLUTION: A conical index 2 is formed in the center of the surface of a protective cap. If an embedded box is completely covered with concrete, therefore, the index 2 is positioned above the ground level, and thus the embedded box can be located with accuracy. Further, use of the protective cap 3 with index makes it unnecessary to unnecessarily crush concrete when a floor receptacle is installed. As a result, the floor can easily be repaired. |
