Optical fiber grating intelligent steel strand and its manufacture method

An intelligent steel strand and fiber grating technology, which is applied in the fiber mechanical structure, the coupling of optical waveguides, and the use of optical devices to transmit sensing components, can solve the problems of poor shear resistance and fragile fiber grating sensors, and achieve easy processing. Forming, good lead handling, high strength effect

Active Publication Date: 2008-07-02
LIUZHOU OVM MASCH CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to provide a fiber grating intelligent steel strand with self-sensing characteristics, and at the same time provide a production method of the intelligent steel strand to solve the problems existing in the application of fiber grating sensors to steel strands The fiber grating sensor is relatively fragile, the shear resistance is poor, the problem of special protection is required during application, and the key technical problem of layout process

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  • Optical fiber grating intelligent steel strand and its manufacture method

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Embodiment 1

[0031] Embodiment 1: An optical fiber grating intelligent steel strand.

[0032] The smart steel strand is formed by twisting a central wire and side wires wound around the central wire, the side wires are ordinary high-strength steel wires 3, and the central wire is a fiber grating fiber-reinforced composite containing a fiber grating sensor Smart rib 2 (referring to Fig. 1, Fig. 2), this smart rib 2 comprises fiber reinforced rib 22 and the optical fiber 21 and fiber grating sensor 24 that are distributed in the fiber reinforced rib along the length direction, and the optical fiber coat of non-grating section is covered with plastic pine. Sleeve 23, the plastic loose tube 23 isolating the optical fiber is connected with the fiber reinforcing rib 22, and the optical fiber grating sensor transmission optical fiber 21 is drawn from the end of the steel strand (see FIG. 3).

[0033] As a transformation of Embodiment 1 of the present invention, a temperature-compensated fiber gra...

Embodiment 2

[0036] Embodiment 2: The manufacturing method of the fiber Bragg grating intelligent steel strand of the present invention.

[0037] The method includes the following steps:

[0038] A. Fabrication of Fiber Bragg Grating Fiber Reinforced Composite Smart Rib:

[0039]1) Calculate the blanking length of the fiber-reinforced polymer rib 2, and determine the fiber grating sensors 24, 25 1 、25 2 The position in the length direction of the steel strand and connected in series in the optical fiber, and calculate the minimum length of the exit optical fiber,

[0040] 2) Put 1 to 20 plastic loose sleeves 23 tubes on the tubes containing grating sensors 24, 25 1 、25 2 There is no grating section in the optical fiber, and then the thermal extrusion method will contain the grating sensor 24, 25 1 、25 2 The optical fiber is pulled together with the fiber, so that the plastic loose tube 23 is connected with the fiber reinforced rib 22, and the fiber reinforced composite smart rib 2 co...

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Abstract

An intellectual steel strand for fiber lattice, which is molded by the stranding of central wire and wires around the central wire, the central wire is the enhanced composite intellectual rib of fiber lattice of a fiber lattice sensor; the intellectual rid comprises a fiber enhanced rid and fiber distributed along the lengthwise direction of the fiber enhanced rib, the fiber lattice sensor; a plastic sleeve is sleeved around the fiber without lattice, separates from the fiber and is connected with the fiber enhanced rib; the fiber transmitted by the fiber lattice sensor is led out from the head of the steel strand; a preparation method of the steel strand comprises the following steps of: firstly preparing the fiber lattice fiber enhanced composite intellectual rib; scattering stranding machines with the same length with the intellectual rib and substituting the central wire of the steel strand with fiber lattice fiber enhanced composite intellectual rib and finally molding the wire through stranding. The invented intellectual steel strand has self sensing property with all the advantages of fiber lattice, which can easily grasp the stress condition of the steel strand in the construction and service periods and instruct the tensioning of initial stress and the construction.

Description

Technical field: [0001] The invention relates to an intelligent steel strand applied to prestressed engineering structures such as tied arch bridges, cable-stayed bridges, suspension bridges, external cables, ground anchors, etc., and a manufacturing method thereof. An intelligent steel strand with a real-time monitoring function and a manufacturing method thereof. Background technique: [0002] The steel strand is a single-strand steel wire rope twisted from multiple steel wires, and is widely used as structural components such as concrete prestressed tendons, bridge cables, and geotechnical anchor cables. It is a key stressed component in these structures, and its working state during service is directly related to the safety of the structure. Under normal circumstances, the steel strands are affected by the harsh working environment and are prone to rust, corrosion and deterioration, threatening the safety of the structure during service. Therefore, how to realize the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/44G02B6/34G01D5/353G01L1/24
Inventor 邓年春龙跃朱万旭欧进萍周智
Owner LIUZHOU OVM MASCH CO LTD
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