METHOD FOR ESTIMATION OF FALLING OBJECT FROM CONCRETE STRUCTURE

PROBLEM TO BE SOLVED: To shorten the time required for a human inspection such as a hammering test, a visual confirmation or the like as conventional techniques, and to sharply improve the safety, the certainty or the like of the human inspection regarding a method in which a falling object from a concrete structure is inspectecl and detected easily. SOLUTION: In this invention, the surface of a concrete structure from which a falling object is estimated due to a secular change or a construction defect is coated with a special material having a characteristic whose color or shape is changed due to the load factor of pressure load. A fall danger degree due to the degradation or the like of the concrete structure is judged easily. A change in the place of the fall danger degree is discriminated by a visual or electric observation device, an electric shape device or the like. An abnormal place is detected at an early stage and surely. When the strength of the material to be coated is changed, the fall of the concrete structure is suppressed temporarily, and a man-made disaster and various losses due to the falling object are prevented.