Device for monitoring prestress loss of steel strand

Abstract

The invention relates to a device for monitoring the prestress loss of steel strands, which includes an optical fiber sensor, a temperature compensation sensor, a bellows, a lead protection sleeve, a sensor lead, a sensor protection gasket and a light grating demodulator; The optical fiber sensor is arranged at the inflection point of the steel strand along the length direction of the steel strand in the bellows, and the optical fiber sensor and the temperature compensation sensor are both connected to the optical grating demodulator through the sensor lead wire , the optical grating demodulator is used to obtain the wavelength information collected by the sensor in real time, and then obtain the real-time prestress change of the steel strand. The invention can solve the problem of lack of direct monitoring method for prestress loss in the construction process of existing large-scale building prestress components, and has convenient construction, simple operation and good engineering applicability.

Description

technical field [0001] The invention relates to the field of monitoring the prestress loss of steel strands, in particular to a device for monitoring the prestress loss of steel strands. Background technique [0002] On the one hand, at present, the monitoring method for the prestress loss of steel strands can only measure the effective prestress at the tension end, and cannot know the distribution of the effective prestress of the steel strands inside the beam body. Moreover, the current strain sensors are mostly point sensors, which have a short measurement range and large uncertainty and limitations of the measurement effect, and cannot realize long-term monitoring of prestressed steel strands; on the other hand, according to the actual engineering Requirements, large-diameter sensors are not allowed inside the bellows used in construction, and the steel strands in the bellows are mostly curved, requiring the sensor itself to be bent, that is, the sensor cannot be rigidly...

AI Technical Summary

Problems solved by technology

[0002] On the one hand, at present, the prestress loss monitoring method for steel strands can only measure the effective prestress at the tension end, and cannot know the distribution of the effective prestress of the steel strands inside the beam body.

Moreover, the current strain sensors are mostly point sensors, which have a short measurement range and large uncertainty and limitations of the measurement effect, and cannot realize long-term monitoring of prestressed steel strands; on the other hand, according to the actual engineering Requirements, large-diameter sensors are not allowed inside the bellows used in construction, and the steel strands in the bellows are mostly curved, requiring the sensor itself to be bent, that is, the sensor cannot be rigidly packaged, and the steel wires inside the same bundle of steel strands are pulled and slide , and the friction and sliding between the steel strand and the corrugated pipe can easily cause the strain gauge and the wire to be cut

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