Concrete wall body expansion internal stress measuring sensor and measuring method

Abstract

The invention relates to a concrete wall body expansion internal stress measuring sensor and a measuring method, wherein the sensor comprises a stabilizing block, a stabilizing block with a wire outlet, an elastic body, a strain beam, a foil-type metal strain gauge, a strain gauge lead, a metal fixed block, a signal processing board, a corrugated pipe and an output cable. The measuring method comprises the following steps of: pre-burying the sensor into concrete, acting the expansion internal stress of the concrete onto the strain beam part in the metal elastic body, and driving the deformation of the foil-type metal strain gauge through the deformation of the strain beam, so that the resistance value of the foil-type metal strain gauge is changed; forming a bridge from the foil-type metal strain gauge, applying a power supply to the bridge to generate electrical signals, obtaining the signals with the current of 4-20mA through amplification and voltage conversion, and transmitting the signals to a control sampling chamber through the output cable. The elastic body is formed through integral processing, and the elastic body and the stabilizing blocks are in welded structures. The output cable adopts the protection of the metal corrugated pipe, and the sensor is integrally sealed; the concrete wall body expansion internal stress measuring sensor has good stability, small size, light weight, pressure resistance, corrosion prevention, strong load resisting capability, high precision and small error.

Description

technical field [0001] The present invention relates to a sensor and method for measuring the expansion internal stress generated by a concrete wall, a concrete dam of a reservoir and a concrete bridge pier under the influence of environmental temperature changes and the action of an external force. The measuring medium is solidified concrete. The sensor uses a foil-type metal strain gauge as a detection sensitive part, and belongs to the technical field of sensors for measuring the internal stress of concrete wall expansion. Background technique [0002] There are many types of measuring force sensors, the main typical load cells, tension and pressure sensors, for the measurement of the expansion internal stress of concrete walls, reservoir concrete dams and concrete piers under the influence of environmental temperature changes and the action of external forces. There are certain defects; because the internal stress of solidified concrete is the stress generated as a whole...

AI Technical Summary

Problems solved by technology

[0002] There are many types of measuring force sensors at present, the main typical load cells, tension and pressure sensors, for the measurement of the expansion internal stress of concrete walls, reservoir concrete dams and concrete bridge piers under the influence of environmental temperature changes and the action of external forces There are certain defects; because the internal stress of solidified concrete is the stress generated as a whole, the force acting on a certain point cannot be concentrated, and the internal stress is the force generated internally, not the external force

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