Concrete length measuring instrument and using method

Abstract

The invention discloses a concrete length measuring instrument and a using method. The concrete length measuring instrument comprises a mounting frame and two pre-buried probes. Each of both ends of the mounting frame is provided with an ultrasonic transmitting device and an annular infrared emitting device. The two ultrasonic transmitting devices are located at the centers of the two annular infrared emitting devices respectively. The two pre-buried probes are pre-buried inside the two ends of a concrete test piece respectively. Each pre-buried probe is connected with one infrared receiving ring exposed outside the concrete test piece. The infrared receiving ring is connected to a signal receiving device. A round of infrared reserved holes are arranged on the signal receiving device. Thesignal receiving device communicates with an acoustic wave signal processing device. The ultrasonic transmitting devices transmit acoustic wave signals which are transmitted to the acoustic wave receiving devices at the end portions of the pre-buried probes. The signal processing device converts the acoustic wave signals and the frequency into a digital signal and outputs the digital signal. A measured value is displayed by an electronic measuring instrument.

Description

technical field [0001] The invention relates to a concrete length measuring instrument and a use method thereof, and mainly relates to the monitoring of the expansion rate of concrete with external admixtures. Background technique [0002] In the application of concrete expansion measurement, especially in special construction sites such as post-pouring belts and wet joints, the measurement of expansion rate is not perfect only by vernier calipers and screw micrometers, because the size of the measuring instrument is limited, and the measurement When the range is large, the measurement accuracy is low, and when the measurement accuracy is high, the measurement range is small. In addition, when the spiral micrometer uses the contact method to measure the length, the requirements for the level of measurement are relatively strict, and the measurement results are not accurate. [0003] In order to improve the measurement accuracy, there are many inconveniences in the applicati...

AI Technical Summary

Problems solved by technology

[0002] In the application of concrete expansion measurement, especially in special construction sites such as post-cast belts and wet joints, the measurement of expansion rate is not perfect only by vernier calipers and screw micrometers, because the size of the measuring instrument is limited, and the measurement When the range is large, the measurement accuracy is low, and when the measurement accuracy is high, the measurement range is small

In addition, when the spiral micrometer uses the contact method to measure the length, the requirements for the level of measurement are relatively strict, and the measurement results are not accurate.

[0003] In order to improve the measurement accuracy, there are many inconveniences in the application of the concrete horizontal shrinkage meter and the ratio meter in the specific measurement and post-monitoring process: the standard rod must be corrected before the measurement, and the standard rod is affected by the temperature. The impact is large, and there are errors in the measurement length; when measuring the concrete test form, it is difficult to quickly align the measuring instrument and the test form to read data; the installation of the shrinkage meter and the ratio meter has strict requirements on the monitoring position, levelness and construction environment

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