Integrated packaging structure of long-scale-distance fiber bragg grating and carbon fiber intelligent rib

Abstract

The utility model relates to the technical field of carbon fiber intelligent ribs, in particular to an integrated packaging structure of a long-scale-distance fiber grating and a carbon fiber intelligent rib, and the integrated packaging structure comprises N packaging pipe fittings which are sequentially connected end to end, the two axial ends of each packaging pipe are a lock hole end and a lock catch end respectively, and every two adjacent packaging pipes are movably connected in the axial direction through the corresponding connecting lock catch and the corresponding connecting lock hole. And a fiber grating sensor is fixed in the space in the packaging pipe fitting. During packaging, the carbon fiber intelligent rib wraps the outer layer of the integrated packaging structure. During monitoring, the carbon fiber intelligent rib and the integrated packaging structure strain at the same time, the movable connection structure of the integrated packaging structure pulls the front end and the rear end of the fiber bragg grating respectively, and an optical signal in the fiber bragg grating is changed. The integrated packaging structure can protect the fiber bragg grating from being influenced by the shear stress of the carbon fiber intelligent rib, and the fiber bragg grating is effectively protected.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of carbon fiber intelligent tendons, and particularly relates to an integrated packaging structure of a long-mark-length fiber grating and a carbon fiber intelligent tendon. BACKGROUND

[0002] In health detection of civil engineering structures, the application of carbon fiber intelligent tendons combined with fiber grating sensors is more and more extensive. Integrating and packaging a fiber grating strain sensor into a carbon fiber tendon can realize online detection of axial strain. In a traditional packaging method, a fiber grating is embedded into preformed carbon fiber material for molding, and the fiber grating is fixed in the carbon fiber material after molding. This packaging method is prone to cause a chirp phenomenon of the FBG.

[0003] The chirp phenomenon refers to that the packaged fiber grating is subjected to uneven shear stress, causing the reflection spectrum of the grating to be widened, and reducing the precision of the fiber grating sensor.

[0004] In order to prevent the packaged fiber grating from being subjected to uneven shear stress, the application provides an integrated packaging structure of a long-mark-length fiber grating and a carbon fiber intelligent tendon, which is used for packaging a fiber grating sensor. CONTENT OF THE INVENTION

[0005] In order to overcome the problems in the related art, the application provides an integrated packaging structure of a long-mark-length fiber grating and a carbon fiber intelligent tendon, which comprises N packaging pipe fittings connected in sequence at the head and tail; N is an integer greater than or equal to 2;

[0006] The axial two ends of the packaging pipe fitting are respectively a lock hole end and a lock end, the lock hole end is provided with M connecting lock holes, and the lock end is provided with M connecting locks; M is an integer greater than or equal to 1;

[0007] The two adjacent packaging pipe fittings are movably connected in the axial direction through the connecting lock and the connecting lock hole;

[0008] The inner space of the packaging pipe fitting is used for fixing the fiber grating sensor.

[0009] In an embodiment, the packaging pipe fitting is provided with a grating accommodating cavity for accommodating the fiber grating and a polymer adhesive, and the fiber grating is placed in the grating accommodating cavities of the two adjacent packaging pipe fittings.

[0010] In an embodiment, the packaging pipe fitting is provided with an adhesive injection hole, and the adhesive injection hole is communicated with the grating accommodating cavity.

[0011] In one embodiment, the connecting lock is provided with a first fixing plate and a second fixing plate; the second fixing plate is used to pass through the connecting lock hole for active connection; the width of the connecting lock hole in the axial direction of the packaging pipe is greater than the maximum strain length of the fiber grating; the length of the first fixing plate in the axial direction of the packaging pipe is greater than the maximum strain length of the fiber grating.

[0012] The technical scheme provided in the application can have the following beneficial effects:

[0013] The integrated packaging structure of the application places the fiber grating sensor in the pipes of N active connection packaging pipes. The carbon fiber smart tendon is wrapped outside the packaging pipe containing the fiber grating. The fiber grating of the fiber grating sensor is fixed between two adjacent packaging pipes. When monitoring, when the carbon fiber smart tendon is strained, the distance between the two adjacent packaging pipes is lengthened, and the two packaging pipes pull the front half and the rear half of one fiber grating respectively, so that the fiber grating is strained to change the optical signal to achieve monitoring.

[0014] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the application will become more apparent from the following detailed description of exemplary embodiments of the application taken in conjunction with the accompanying drawings, in which like reference characters refer to the like parts throughout the different views.

[0016] Figure 1 A three-dimensional structural schematic diagram of an integrated packaging structure of a long-gauge fiber grating and a carbon fiber smart tendon shown in an embodiment of the application;

[0017] Figure 2 A front view of a packaging pipe shown in an embodiment of the application;

[0018] Figure 3 A three-dimensional structural schematic diagram of a packaging pipe shown in an embodiment of the application;

[0019] Figure 4 A B-B line sectional view of a packaging pipe shown in an embodiment of the application; Figure 2

[0020] Figure 5 A sectional view of the integrated packaging structure after assembly;

[0021] ​The accompanying drawings are intended to facilitate an understanding of the present application. In some instances, detailed descriptions of all methods, materials, and examples can be omitted so as not to obscure the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. DETAILED DESCRIPTION

[0022] Preferred embodiments of the present application will be described herein below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0023] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0024] It should be understood that although the terms "first", "second", "third" and the like can be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one piece of information from another piece of information of the same type. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present application. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0025] The integration of the fiber grating strain sensor into the carbon fiber bar can realize the online detection of the axial strain. The traditional packaging method is to embed the fiber grating into the preformed carbon fiber material for molding, and the fiber grating is fixed in the carbon fiber material after molding. This packaging method is easy to cause the chirp phenomenon of the FBG.

[0026] The chirp phenomenon refers to the fact that the packaged fiber grating is subjected to uneven shear stress, causing the reflection spectrum of the grating to widen, which reduces the accuracy of the fiber grating sensor.

[0027] Figure 1 A three-dimensional structural schematic diagram of the integrated packaging structure of the long gauge length fiber grating and the carbon fiber intelligent bar according to an embodiment of the present application is shown.

[0028] The integrated packaging structure reduces the shear stress of the fiber grating after packaging. During packaging, the carbon fiber smart tendon is wrapped outside the integrated packaging structure. During monitoring, the carbon fiber smart tendon and the integrated packaging structure are strained at the same time, the movable connection structure of the integrated packaging structure pulls the front and rear ends of the fiber grating respectively, and the light signal in the fiber grating is changed. The integrated packaging structure can protect the fiber grating from the shear stress of the carbon fiber smart tendon, and effectively protect the fiber grating.

[0029] As shown in Figure 1 , the integrated packaging structure comprises N packaging pipes connected in sequence. N is an integer greater than or equal to 2.

[0030] Exemplarily, Figure 1 , the first packaging pipe 100 is movably connected with the second packaging pipe 200. In actual application, the number of packaging pipes can be selected according to actual needs to adapt to the monitoring needs of carbon fiber tendons of different lengths.

[0031] During packaging, the integrated packaging structure is placed on the axis of the carbon fiber tendon, the carbon fiber tendon is wrapped around the integrated packaging structure layer by layer, the optical fiber passes through the N packaging pipes of the integrated packaging structure, and the fiber grating is arranged inside the integrated packaging structure. Figure 2 The front view of the packaging pipe shown in the embodiment of the application.

[0032] As shown in Figure 2 , the two ends of the packaging pipe in the axial direction are respectively a lock hole end 102 and a lock end 101, the lock hole end 102 is provided with M connecting lock holes 1021, and the lock end 101 is provided with M connecting lock buckles 1011. Two adjacent packaging pipes are movably connected through the connecting lock buckles 1011 and the connecting lock holes 1021. M is an integer greater than or equal to 1.

[0033] In the embodiment of the application, the connecting lock holes 1021 of the lock hole end 102 are arranged around the circumference of the packaging pipe, and the connecting lock buckles 1011 of the lock end 101 are arranged around the circumference of the packaging pipe. The connecting lock buckles 1011 are embedded in the connecting lock holes 1021.

[0034] Figure 3 The three-dimensional structure diagram of the packaging pipe shown in the embodiment of the application.

[0035] Specifically, the connecting lock 1011 is provided with a first fixed plate 1012 and a second fixed plate 1013, and the second fixed plate 1013 is movably connected through the connecting lock hole 1021. According to the existing production method of the chain structure, the first fixed plate 1012 and the second fixed plate 1013 are not closed before assembly, and the second fixed plate 1013 is fixed by laser or electric welding during assembly.

[0036] The fiber grating is placed in the former packaging pipe, the lock end 101 of the latter packaging pipe is abutted to the lock hole end 102 of the former packaging pipe, and the two packaging pipes are connected through a welding operation.

[0037] In the embodiment of the present application, the width of the connecting lock hole 1021 in the axial direction of the packaging pipe is greater than the maximum strain length of the fiber grating; and the length of the first fixed plate 1012 in the axial direction of the packaging pipe is greater than the maximum strain length of the fiber grating.

[0038] In the axial direction of the packaging pipe, the two adjacent packaging pipes can be stretched and contracted along the axial direction of the packaging pipe, and the stretching and contracting length is greater than the maximum strain length of the fiber grating.

[0039] Figure 4 For Figure 2 The B-B line cross-sectional view of the packaging pipe is shown.

[0040] As Figure 4 Specifically, the fiber grating is packaged in the packaging pipe, the packaging pipe is provided with a grating accommodating cavity 103, the fiber grating is placed in the grating accommodating cavities 103 of two adjacent packaging pipes; and the length of the fiber grating is greater than the length in the axial direction of the grating accommodating cavity 103.

[0041] In the embodiment of the present application, the fiber grating is inserted into the grating accommodating cavity 103 along the axial direction. The front half and the rear half of the fiber grating are respectively placed in the grating accommodating cavities 103 of two adjacent packaging pipes.

[0042] Further, the packaging pipe is provided with an adhesive injection hole 104, and the polymer adhesive is injected into the grating accommodating cavity 103 along the adhesive injection hole 104, so that the front half and the rear half of the fiber grating are respectively pasted to the inner walls of two adjacent packaging pipes.

[0043] Figure 5 The cross-sectional view of the region of the assembled integrated packaging structure is shown.

[0044] As Figure 5As shown, the fiber grating 300 is placed between the first and second encapsulation tubes 100 and 200, and the polymer 400 is injected into the grating accommodating cavity 103, and after the polymer 400 is solidified, the fiber grating 300 is adhered in the grating accommodating cavities 103 of the first and second encapsulation tubes 100 and 200, respectively.

[0045] In the embodiments of the present application, the integrated encapsulation structure places the fiber grating sensor in the tubes of N actively connected encapsulation tubes. The carbon fiber smart tendon is wrapped outside the encapsulation tube encapsulating the fiber grating. The fiber grating of the fiber grating sensor is fixed between two adjacent encapsulation tubes. When monitoring, when the carbon fiber smart tendon is strained, the distance between the two adjacent encapsulation tubes is lengthened, and the two encapsulation tubes simultaneously pull the front half and the rear half of one fiber grating, respectively, so that the fiber grating is strained to change the optical signal to achieve monitoring.

[0046] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical application, or improvement of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. An integrated packaging structure of long gauge fiber grating and carbon fiber smart bar, characterized in that, The application relates to a packaging pipe assembly, which comprises N packaging pipes connected in sequence; N is an integer greater than or equal to 2; The packaging pipe is provided with M connecting lock holes (1021) at the lock hole end (102) and M connecting lock buckles (1011) at the lock buckle end (101); M is an integer greater than or equal to 1; Two adjacent packaging pipes are movably connected in the axial direction through the connecting lock buckle (1011) and the connecting lock hole (1021); The inner space of the packaging pipe is used for fixing a fiber grating sensor.

2. The integrated packaging structure of long gauge fiber grating and carbon fiber smart tendon according to claim 1, characterized in that, The packaging pipe is provided with a grating accommodating cavity (103) for accommodating a fiber grating and a polymer adhesive, and the fiber grating is placed in the grating accommodating cavities (103) of two adjacent packaging pipes.

3. The integrated packaging structure of long gauge fiber grating and carbon fiber smart bar according to claim 2, characterized in that, The packaging pipe is provided with an adhesive injection hole (104) which is communicated with the grating accommodating cavity (103).

4. The integrated packaging structure of long gauge fiber Bragg grating and carbon fiber smart tendon according to claim 1, characterized in that, The connecting lock buckle (1011) is provided with a first fixing plate (1012) and a second fixing plate (1013); The second fixing plate (1013) is used for movably connecting the connecting lock hole (1021); The width of the connecting lock hole (1021) in the axial direction of the packaging pipe is greater than the maximum strain length of the fiber grating; The length of the first fixing plate (1012) in the axial direction of the packaging pipe is greater than the maximum strain length of the fiber grating.

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