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Method for paving internal concrete distributed sensing fibers

A laying method and technology of sensing optical fibers, which are applied in the installation of optical fibers/cables, the use of optical devices, thermometers with physical/chemical changes, etc. Structural strain and temperature, stable health monitoring, effects of non-destructive laying

Inactive Publication Date: 2012-07-25
ZHEJIANG UNIV
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Problems solved by technology

[0010] The invention provides a method for laying distributed sensing optical fibers in concrete, which is not only convenient for construction, but also solves the problem that distributed sensing optical fibers cannot be embedded in concrete in the field of civil engineering health monitoring, and realizes distributed sensing in concrete Long-distance lossless laying of optical fiber

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  • Method for paving internal concrete distributed sensing fibers
  • Method for paving internal concrete distributed sensing fibers
  • Method for paving internal concrete distributed sensing fibers

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Embodiment Construction

[0040] Fiber Optic Duct Laying

[0041] A highway tunnel has a total length of 790m, and the layout of the optical fiber pipeline is as follows: figure 1 As shown, it can be divided into the circumferential distributed sensing optical fiber duct 1 and the longitudinal sensing optical fiber duct 2 for connecting each circumferential sensing optical fiber duct 1, the circumferential sensing optical fiber duct 1 and the longitudinal sensing optical fiber duct 2 For connections, see figure 2 shown.

[0042] The fiber optic pipe adopts an aluminum-plastic composite pipe with an inner diameter of 12mm and an outer diameter of 16mm, and the diameter of the sensing fiber selected is 3mm.

[0043] A number of fiber optic air blowing ports are reserved for the fiber optic duct, and the entire fiber optic duct is divided into several grouting sections, and each grouting section is reserved with a grouting port and a grout outlet; the fiber optic air blowing port can also be used as a ...

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Abstract

The invention discloses a method for paving internal concrete distributed sensing fibers, which comprises the following steps: A) checking and cleaning a fiber conduit embedded in the concrete; B) blowing the sensing fibers into the fiber conduit through a fiber gas blowing port; C) selecting a grouting section, injecting slurry into a grouting port of the grouting section, closing a slurry outlet of the grouting section after the slurry is full of the grouting section, and keeping the slurry in the grouting section for 3 to 5 minutes under the pressure of between 1.0 and 1.5Mpa so as to fix the sensing fibers in the fiber conduit; and D) circularly operating the step C) till the grouting of all the grouting sections is finished. The method achieves quick and lossless pavement for the long-distance distributed sensing fibers, solves the difficult problem that the structure monitoring field cannot embed the distributed sensing fibers into the concrete, ensures the distributed fiber sensing technology to monitor the structural strain and temperature more effectively, and realizes structural long-term and stable healthy survey.

Description

technical field [0001] The invention relates to the field of civil engineering health monitoring, in particular to a method for laying distributed sensing optical fibers inside concrete. Background technique [0002] According to the relationship between Brillouin frequency shift and fiber strain and temperature, distributed fiber optic sensing technology, when the strain or temperature along the fiber changes, the frequency of backscattered light in the fiber will drift. The frequency drift has a good linear relationship with the change of fiber strain and temperature, so the distribution information of temperature and strain along the fiber can be obtained by measuring the frequency drift of Brillouin backscattering in the fiber. Distributed optical fiber sensing technology is currently the most cutting-edge technology in the world. Compared with traditional monitoring technology, it has the following advantages: [0003] (1) Distributed: A monitoring network with a certa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/52G01K11/32G01B11/16G01K11/322
Inventor 金伟良何勇毛江鸿
Owner ZHEJIANG UNIV
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