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Optical fiber grating intelligent dragline

A fiber grating and cable technology, applied in the cable field with automatic monitoring function, can solve the problems of inability to real-time online monitoring, poor stability due to interference, poor operability, etc., and achieve excellent sensor performance, stability and durability. , easy to use effect

Inactive Publication Date: 2005-03-09
欧进萍 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the force test, damage evaluation and decision-making of cable replacement mainly rely on acceleration test, corrosion detection and magnetic coil detection technology. These technologies have disadvantages such as low precision, poor operability, poor stability under interference, and incapable of real-time online monitoring.

Method used

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  • Optical fiber grating intelligent dragline
  • Optical fiber grating intelligent dragline
  • Optical fiber grating intelligent dragline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one. combine figure 1 The optical fiber grating smart cable includes a steel wire or steel strand 5 and a sheath 8 wrapped around the steel wire or steel strand, and an optical fiber integrated with the steel wire or steel strand is arranged along the length direction in the steel wire or steel strand Grating sensor7. Simultaneously combine figure 2 , 3 , the product of the present invention can be produced by such a method: first, determine the position of the fiber grating on the cable, and calculate the minimum length of the outlet optical cable, and then arrange the fiber grating on the polished cable with a high-performance adhesive Wire, and mark the position of the grating. Considering the influence of temperature during the long-term service health monitoring of the cable, let one of the fiber gratings be suspended in the air, and only sense the temperature information for temperature compensation. It must be noted here that the fiber grating us...

Embodiment 2

[0015] Embodiment two. combine Figure 4 The fiber grating smart cable includes a cable 6, fiber grating sensors 7, 9, a capillary metal tube 10 for protecting the fiber grating sensor 9 and a signal transmission cable 1. Such method can be used to make: first carefully cut out a notch 11 of about 20 × 2cm on the drag cable 6 with a steel knife to expose the steel wire (or steel strand), and then grade the exposed steel strand with sandpaper. Polish and clean the polished strand surface with acetone to remove debris and grease. Afterwards, the welded optical fiber gratings 7 and 9 are pasted in proper positions with an adhesive with excellent performance. It must be noted here that the fiber grating 5 for temperature compensation must be placed in the capillary metal tube and suspended in the air so that it is in a freely expandable state. After the fiber grating is laid, the fiber grating transmission cable 1 is led out. Finally, repair the PE sheath at the slot opening a...

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PUM

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Abstract

An intelligent pull cable with optical fibre raster for showing its stressed state is composed of steel wires or twisted steel wires, protecting jacket, and the optical fibre raster sensors arranged along with said steel wires or twisted steel wires in their longitudinal direction.

Description

[0001] (1) Fields [0002] The invention relates to an intelligent cable used for cable systems such as cable-stayed bridges, suspension rod arch bridges, cables, and suspension bridges, in particular to a cable with an automatic monitoring function. (two), background technology [0003] Cable-stayed bridge cables, arch bridge suspenders, cables, suspension cables and other cable components are the core and important components of bridges, cableways and other structures. Because the degree of freedom of the bridge structure is small, especially the suspension rod arch bridge structure, the cable plays the key role of "pulling the whole body". Due to environmental corrosion, fatigue damage, heavy distribution of internal forces during service, etc., the cables are extremely vulnerable to damage, and their service time is often much shorter than the pre-designed one, and the cost of cable replacement is very high, generally more than double the total cost of the original bridge ...

Claims

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Application Information

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IPC IPC(8): D07B1/14E01D19/16
Inventor 欧进萍周智李惠
Owner 欧进萍