METHOD FOR MEASURING LENGTH AND ANGLE OF SLANT CRACK GENERATED IN SURFACE OF CONCRETE STRUCTURE

摘要

PURPOSE: A method for measuring length and angle of a slant crack in a concrete building is provided to measure an angle and length of a crack formed on a surface of the concrete building at the same time and to improve reliability of safety. CONSTITUTION: A ultrasonic receiving transducer is installed on a center of a slant crack. An ultrasonic transferring transducer is installed on the center of the slant crack. The ultrasonic transferring transducer is transferred to the ultrasonic receiving transducer to measure first electric wave time. The ultrasonic receiving transducer is horizontally moved to a rear side of a center portion of a crack. A first sensor is arranged on a surface of a concrete building to receive elastic wave by being separated form the center portion of the crack. A first impact source is established on the other portion of the crack in the concrete building. Moreover, a second impact source is established on the surface of the concrete building. Thereby, method for measuring length and angle of a slant crack in a concrete building measures an angle and length of the crack formed on the surface of the concrete building at the same time.