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A Fiber Bragg Grating Large Range Strain Sensor for Monitoring the Strain of Prestressed Steel Strand

A technology of prestressed steel strands and strain sensors, which is applied in the field of fiber Bragg grating sensors and large-range strain sensors of fiber Bragg gratings, and can solve the problems of difficult to realize strain monitoring of prestressed steel strands, impossibility of fiber grating sensor implantation, and strain transmission of composite structures Complexity and other problems, to achieve the effect of improving the measurable range of strain, ensuring construction safety and quality, and simple structure

Inactive Publication Date: 2015-12-09
天津市海达伟业钢绞线股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strain transfer of the composite structure of the fiber grating large-range strain sensor based on the composite structure is too complicated, and the performance stability of the sensor is affected by many factors.
Therefore, it is still difficult to realize the strain monitoring of the prestressed steel strand
Due to the special construction and installation method of the prestressed steel strand, it is still impossible to implant the fiber grating sensor with superior performance into the prestressed steel strand to achieve online real-time monitoring of its strain

Method used

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  • A Fiber Bragg Grating Large Range Strain Sensor for Monitoring the Strain of Prestressed Steel Strand
  • A Fiber Bragg Grating Large Range Strain Sensor for Monitoring the Strain of Prestressed Steel Strand
  • A Fiber Bragg Grating Large Range Strain Sensor for Monitoring the Strain of Prestressed Steel Strand

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Embodiment 1

[0024] figure 1 , 2 A fiber grating large-range strain sensor for monitoring the strain of the prestressed steel strand shown in the present invention includes a fiber grating 1, an optical fiber wire 2, an inner capillary steel pipe 3, an outer capillary steel pipe 4, high-strength epoxy resin 5, and an arc shaped support 6. The fiber grating 1 of the optical fiber wire 2 is placed in the middle of the inner capillary steel pipe 3, and the inner capillary steel pipe 3 is covered with two sections of outer capillary steel pipes 4 with a gap of 1 mm in the middle; the two sections of outer capillary steel pipes 4. The relatively distant end protrudes from the inner layer capillary steel pipe 3, which is 5mm, but shorter than the optical fiber wire 2. The part of the end of the outer layer capillary steel pipe 4 that protrudes from the inner layer capillary steel pipe 3 is provided with high-strength epoxy resin 5, and the inner layer Both ends of the capillary steel pipe 3 ar...

Embodiment 2

[0026] A fiber grating large-range strain sensor for monitoring the strain of prestressed steel strands of the present invention has two sections of the outer capillary steel pipe 4 that are relatively far away from each other, and the inner capillary steel pipe 3 is protruded by 2 mm, and the gap is 0.5 mm. Others are with embodiment 1.

Embodiment 3

[0028] A fiber grating large-range strain sensor for monitoring the strain of prestressed steel strands of the present invention has two sections of the outer capillary steel pipe 4 that are relatively far away from each other, and the inner capillary steel pipe 3 is 10 mm long, and the gap is 1.5 mm. . Others are with embodiment 1.

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Abstract

The invention relates to a fiber grating sensor, in particular to a fiber grating wide-range strain sensor for monitoring strain of pre-stressed steel stranded wires. The fiber grating wide-range strain sensor comprises optical fiber gratings, optical fiber wires and capillary steel tubes and is characterized in that the optical fiber gratings of the optical fiber wires are arranged in the middles of inner-layer capillary steel tubes, and two sections of outer-layer capillary steel tubes provided with gaps in the middles are sleeved outside the inner-layer capillary steel tubes. The far-away ends of the two sections of outer-layer capillary steel tubes extend out of the inner-layer capillary steel tubes but are shorter than the optical fiber wires, and arc-shaped support seats are arranged at adaptive positions of the two sections of outer-layer capillary steel tubes respectively. The fiber grating wide-range strain sensor for monitoring the strain of the pre-stressed steel stranded wires is simple in structure, easy to process and manufacture, convenient to install and stable and reliable in performance, achieves long-period online monitoring of stain change of the pre-stressed steel stranded wires to the most extent and achieves online real-time monitoring of the prestress change condition in the slow curing process of slow binder in a later period.

Description

technical field [0001] The invention relates to an optical fiber grating sensor, in particular to an optical fiber grating large-range strain sensor for monitoring the strain of a prestressed steel strand, and belongs to the field of structural health monitoring in civil engineering. Background technique [0002] At present, with the continuous application of prestressed structures in building structures, the research on stress monitoring of various high-strength steel strands during construction and service is getting more and more in-depth. Since the tensile strength of the steel strand is much higher than that of ordinary steel bars, the stress value of the steel strand is very large during work. In the tensioning process, the method of overtensioning is often used to compensate for the stress loss of the steel strand in the later stage. This causes the strain of the steel strand to be greater than the ultimate fracture strain of the bare fiber Bragg grating during tensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 孙丽周海旺朱万成
Owner 天津市海达伟业钢绞线股份有限公司