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Method for detecting deformation and internal force of underground h-shaped steel by using optical fiber or grating

A technology of grating detection and H-shaped steel, which is applied in the measurement of the change force of its optical properties when the material is under stress, adopts optical devices, measuring devices, etc., and can solve the problems of detecting the deformation and internal force of underground H-shaped steel, etc. Achieve the effects of improving detection accuracy, low cost, and expanding the detection field

Inactive Publication Date: 2012-02-22
CHINA FIRST METALLURGICAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, optical fiber and grating monitoring have been used in cable-stayed bridges and other fields. Optical fibers and gratings are arranged on steel strands, but they are all above-ground structures. At present, there is no method to use optical fibers or gratings to detect the deformation and internal force of underground H-shaped steel.

Method used

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  • Method for detecting deformation and internal force of underground h-shaped steel by using optical fiber or grating
  • Method for detecting deformation and internal force of underground h-shaped steel by using optical fiber or grating
  • Method for detecting deformation and internal force of underground h-shaped steel by using optical fiber or grating

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Effect test

Embodiment 1

[0032] Such as figure 1 , figure 2 , image 3 Shown, utilize optical fiber or grating to detect the deformation and the internal force method of underground H-shaped steel, it comprises the following steps:

[0033] 1) On both sides of the flange 2 of the H-shaped steel where the optical fiber or grating needs to be laid, the steel bar 4 with a larger diameter than the optical fiber or grating is spot welded (that is, the optical fiber or grating is laid in the two steel bars 4, and the optical fiber or grating is U-shaped. Arrangement, the diameter of the steel bar is 3-6mm larger than the diameter of the optical fiber or grating), forming an optical fiber retaining groove (or steel groove); the spot welding position is on the other side where the optical fiber or grating is not laid, and the spot welding distance is 1.5-2m. And bend to the web 3 of the H-shaped steel into an arc (such as image 3 As shown, on the flange 2 on the same side of the H-shaped steel, the trans...

Embodiment 2

[0041] It is basically the same as Embodiment 1, except that the arrangement of the optical fiber retaining groove and the optical fiber in step 1) is as follows: Figure 4 , Figure 5 , Figure 6 As shown, the same optical fiber or grating is arranged on the flanges 2 on both sides of the H-shaped steel (in Embodiment 1, the same optical fiber or grating is arranged on the flange 2 on the same side of the H-shaped steel).

[0042] Step 1) specifically: the same optical fiber or grating is arranged on the flange 2 on both sides of the H-shaped steel (the optical fiber or grating is arranged in a U shape, and the U-shaped bottom of the optical fiber or grating is arranged on the web 3 of the H-shaped steel), One side of the flange 2 on both sides of the H-shaped steel where the optical fiber or grating needs to be laid is spot-welded with a steel bar 4 larger in diameter than the optical fiber, and the other side of the H-shaped steel flange 2 where the optical fiber or gratin...

Embodiment 3

[0045] It is basically the same as Embodiment 1 or Embodiment 2, except that: the steel bars are replaced by plywood strips; the plywood strips with a diameter larger than the optical fiber are bonded to the H-shaped steel.

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Abstract

The invention relates to a detection method for deformation and internal force of underground H-shaped steel. The method for utilizing optical fiber or grating to detect the deformation and internal force of underground H-shaped steel is characterized in that it comprises the following steps: 1) fixing a retaining strip for protecting optical fiber next to the position where optical fiber or grating needs to be laid on the flange of H-shaped steel to form an optical fiber Retaining groove; 2) Derusting treatment on the surface of the position where the optical fiber or grating needs to be laid on the flange of the H-shaped steel; 3) Brushing structural glue on the surface of the position where the optical fiber or grating needs to be laid on the derusted H-shaped steel; 4 ) laying optical fiber or grating in the above-mentioned optical fiber retaining groove; 5) using structural glue to stick the optical fiber or grating to the surface of the H-shaped steel, and then brushing structural glue on the surface of the optical fiber or grating in the optical fiber retaining groove, and sticking the woven cloth; 6) Install the H-shaped steel underground; 7) The optical fiber or grating is connected with the optical cable on the ground, and the optical cable is connected with the detection instrument to detect the deformation and internal force of the underground H-shaped steel. The method is simple and easy to implement and low in cost.

Description

technical field [0001] The invention relates to a detection method for deformation and internal force of underground H-shaped steel. Background technique [0002] At present, optical fiber and grating monitoring have been used in cable-stayed bridges and other fields. Optical fibers and gratings are arranged on steel strands, but they are all above-ground structures. At present, there is no method to use optical fibers or gratings to detect the deformation and internal force of underground H-shaped steel. Contents of the invention [0003] The object of the present invention is to provide a method for detecting the deformation and internal force of underground H-shaped steel by using optical fiber or grating, which is simple and easy to implement and low in cost. [0004] In order to achieve the above object, the technical solution of the present invention is: utilize optical fiber or grating to detect the deformation of underground H-shaped steel and the method for intern...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16G01L1/24
Inventor 王平丁勇何宁
Owner CHINA FIRST METALLURGICAL GROUP