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Method for monitoring compression and tensile deformation of stressed rod piece based on optical fiber sensing technology

An optical fiber sensing and tensile deformation technology, which is used in measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problem of inability to obtain data quickly, low monitoring coverage density, and inability to ensure the personal safety of measurement personnel. and other problems, to achieve the effect of non-interference measurement, sensitivity and accuracy improvement, and high sensitivity

Active Publication Date: 2020-02-28
SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]In the current foundation pit construction, the collapse caused by the instability of the foundation pit slope may cause major safety risks or accidents in the foundation pit and surrounding building facilities
At present, in the monitoring of the foundation pit construction process, manual on-site measurement is mostly used, and the construction site is monitored through instruments such as full rotation instruments, levels, and reading instruments. This method often takes a lot of time for technicians, resulting in the inability to quickly obtain data. , using manual monitoring, which often has a small monitoring coverage density, cannot meet the requirements of early warning, and cannot guarantee the personal safety of surveyors

Method used

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  • Method for monitoring compression and tensile deformation of stressed rod piece based on optical fiber sensing technology
  • Method for monitoring compression and tensile deformation of stressed rod piece based on optical fiber sensing technology
  • Method for monitoring compression and tensile deformation of stressed rod piece based on optical fiber sensing technology

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Embodiment

[0027] Example: such as Figure 1-4 As shown, this embodiment specifically relates to a method for monitoring the compression and tensile deformation of a stressed rod based on optical fiber sensing technology, which specifically includes the following steps:

[0028] (1) According to the engineering needs, determine the area of ​​the supporting rods to be tested in the foundation pit enclosure structure 1, and determine the distance between each fixing ring according to the needs;

[0029] (2) For different types of support rods, choose different installation methods:

[0030] If the support bar is a concrete support 4, then the quasi-distributed steel stress sensing optical cable 5 is arranged along the axial direction of the concrete support 4, and the quasi-distributed steel stress sensing optical cable 5 is specifically bundled and arranged in two symmetrically arranged in the concrete support 4. on the main bar, and form a U-shaped return circuit; the quasi-distributed ...

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Abstract

The invention discloses a method for monitoring compression and tensile deformation of a stressed rod piece based on an optical fiber sensing technology. The method comprises the following steps thatdifferent sensing optical cables, namely quasi-distributed steel bar stress sensing optical cables or quasi-distributed fiber bragg grating strain sensing optical cables, are selected for installationaccording to the type of the supporting rod piece in a to-be-detected area in a foundation pit support structure, and the sensing optical cables are connected with an FBG demodulator; the FBG demodulator sends out a broadband optical signal, transmits the broadband optical signal to the sensing optical cable and reflects a group of narrow-band light with different wavelengths; when the sensing optical cable changes along with the supporting rod piece, the resonance wavelength of the sensing optical cable drifts, the wavelength of reflected narrow-band light is recognized through the FBG demodulator, the wavelength change of the narrow-band light is monitored, and whether the supporting rod piece is subjected to tensile deformation or compressive deformation is judged. Compared with a traditional point type monitoring method, the method has the advantages that quasi-distributed monitoring is achieved through the optical fiber sensing technology, and the measurement convenience, sensitivity and precision are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of automatic monitoring, and in particular relates to a method for monitoring compression and tensile deformation of stressed rods based on optical fiber sensing technology. Background technique [0002] In the current foundation pit construction, the collapse caused by the instability of the foundation pit slope may cause major safety risks or accidents in the foundation pit and surrounding building facilities. At present, in the monitoring of the foundation pit construction process, manual on-site measurement is mostly used, and the construction site is monitored through instruments such as full rotation instruments, levels, and reading instruments. This method often takes a lot of time for technicians, resulting in the inability to quickly obtain data. , using manual monitoring, which often has a small monitoring coverage density, cannot meet the requirements of early warning, and cannot guarantee the per...

Claims

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Application Information

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IPC IPC(8): G01N3/06G01N3/08
CPCG01N3/068G01N3/08G01N2203/0017G01N2203/0019G01N2203/0075G01N2203/0641
Inventor 王成荣丁利红陈鸿叶蓉刘朝明陈培泰徐克洋唐耀华贾立翔阳侣胡有宝金奚钱存超潘骏
Owner SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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