Apparatus used for monitoring loss of pre-stress of steel stranded wires

A steel strand and prestressing technology, which is applied in the field of devices for monitoring the prestress loss of steel strands, can solve the problems of strain gauges and wires being cut, uncertainty of measurement results, and inability to realize long-term monitoring of prestressed steel strands, etc. , achieving high durability and long-term monitoring

CN106969862AInactive Publication Date: 2017-07-21FUZHOU UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-07-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an apparatus used for monitoring the loss of pre-stress of steel stranded wires. The apparatus comprises optical fiber sensors, temperature compensating sensors, a bellows, a leading wire protective bushing, sensor leading wires, a sensor protection gasket and a fiber grating demodulator, the optical fiber sensors are distributed at inflection points of the steel stranded wires along the length direction of the steel stranded wires in the bellows, the optical fiber sensors and the temperature compensating sensors are both connected with the fiber grating demodulator through the sensor leading wires, and the fiber grating demodulator is used for obtaining wavelength information acquired by the sensors in real time to further obtain the real-time pre-stress change condition of the steel stranded wires. According to the apparatus, the problem of the lack of a direct monitoring method of the loss of the pre-stress in a construction process of a large-scale building pre-stress member can be solved, the construction is convenient, the operation is simple, and the engineering applicability is good.
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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...

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] This embodiment provides a device for monitoring the prestress loss of steel strands, such as figure 1 As shown, it includes an optical fiber sensor 1, a temperature compensation sensor 2, a corrugated tube 3, a lead wire protection sleeve 4, a sensor lead wire 5, a sensor protection gasket 6, and an optical grating demodulator 7; the optical fiber sensor 1 is placed along the corrugated The steel strand 8 in the pipe 3 is arranged at the inflection point of the steel strand in the length direction, and the optical fiber sensor 1 and the temperature compensation sensor 2 are both connected by the sensor lead 5 and the optical grating demodulator 7 connected, the optical grating demodulator 7 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.

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