Pull rod joint capable of detecting stress

Abstract

The utility model relates to the technical field of building structures, in particular to a pull rod joint capable of detecting stress, which comprises a pull rod joint, a first strain gauge, a second strain gauge and a fiber bragg grating, the fiber bragg grating is fixed in wiring grooves on the upper end faces of the first strain gauge and the second strain gauge, and leads at two ends of the fiber bragg grating penetrate through the pull rod joint. Connection with detection equipment is facilitated, and stress data are read; the fiber bragg grating is adopted to detect stress, the advantages of high sensitivity, strong anti-electromagnetic interference capability and the like of optical fibers are fully utilized, the detection precision is improved, and the installation difficulty is reduced; wherein the far ends of the first strain gauge and the second strain gauge are fixedly connected with the pull rod joint, the stretching amount of the fiber bragg grating in the gap is increased, and the large detection error caused by the too small stretching amount is avoided; in addition, the fiber bragg grating is fixed through glue, a coating layer on the surface of the fiber bragg grating at the gluing position is removed, an internal fiber core is in direct contact with the glue, and the bonding strength of the fiber bragg grating is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to building structure technical field especially relates to a pull rod joint of stress detectable. BACKGROUND

[0002] With the development of the times, increasing stress detection devices on building structures has become a market trend. There are two methods for adding stress detection devices to traditional pull rod products; one is to add a stress sensor in the pull rod, but this method requires the pull rod body to be divided into two sections, and the price of the middle sensor is relatively high, which has a significant impact on the cost. The other method is to add a sensor in the pin shaft. This method requires converting the tensile stress of the pull rod into bending stress. During the stress conversion process, stress loss may occur, resulting in inaccurate data. In addition, due to the direction of the force, the pin shaft may be under compression or tension in actual use, and different stress modes may affect the accuracy of the data, so the installation direction of the pin shaft is required to be higher. Therefore, it is necessary to design a pull rod joint that can detect stress to solve the above problems. SUMMARY

[0003] Therefore, the utility model discloses the purpose of providing a kind of pull rod joint of stress detectable.

[0004] The utility model discloses the following technical solutions:

[0005] A pull rod joint capable of detecting stress includes a pull rod joint, a first strain gauge, a second strain gauge and a fiber Bragg grating. The pull rod joint is provided with a groove, and the bottom surface of the inner side of the groove is provided with a through hole penetrating through the pull rod joint. The first strain gauge and the second strain gauge are respectively fixed to the two ends of the inner side of the groove, and a gap is formed between the first strain gauge and the second strain gauge. The fiber Bragg grating is fixed to the upper end surface of the first strain gauge and the second strain gauge, and the two ends of the fiber Bragg grating pass through the through hole and out of the pull rod joint.

[0006] Preferably, the groove extends along the length direction of the pull rod joint; the inner side of the groove includes a first welding surface and a second welding surface oppositely arranged along the length direction of the pull rod joint; the first strain gauge is fixedly connected with the first welding surface, and the second strain gauge is fixedly connected with the second welding surface.

[0007] Preferably, the first strain gauge and the second strain gauge are cuboids.

[0008] Preferably, the upper end surface of the first strain gauge is provided with a first wiring groove extending along the length direction of the pull rod joint; the upper end surface of the second strain gauge is provided with a second wiring groove extending along the length direction of the pull rod joint; and the first wiring groove and the second wiring groove are used to accommodate the fiber Bragg grating.

[0009] Preferably, the first strain gauge is provided with a first wire outlet hole in communication with the first wire slot; the second strain gauge is provided with a second wire outlet hole in communication with the second wire slot; and the two ends of the fiber grating are respectively led out from the first wire outlet hole and the second wire outlet hole.

[0010] Preferably, the perforation includes a first perforation and a second perforation; the first perforation is coaxially arranged with the first wire outlet hole; and the second perforation is coaxially arranged with the second wire outlet hole.

[0011] Preferably, the first wire slot and the second wire slot each include a connecting section, the connecting section is provided with an adhesive layer; the fiber grating includes a fiber core and a coating layer which are arranged in layers from inside to outside; the coating layer is provided with a notch to expose the fiber core; and the notch is arranged in the connecting section to connect the fiber core and the adhesive layer.

[0012] Preferably, the fiber grating includes a detection section, the detection section is arranged in the gap between the first strain gauge and the second strain gauge.

[0013] Preferably, the pull rod joint includes a connecting head, the inner side of the connecting head is provided with an internal thread for connecting with a pull rod.

[0014] Preferably, the pull rod joint includes a connecting hole for structural connection.

[0015] The pull rod joint of the present application has the following advantages:

[0016] The pull rod joint of the present application has the following advantages: BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a structural schematic view of the pull rod joint of the present application;

[0018] Figure 2The first partial structure diagram of the stress-detectable pull rod joint of the utility model is shown in the figure.

[0019] Figure 3 The second partial structure diagram of the stress-detectable pull rod joint of the utility model is shown in the figure.

[0020] Figure 4 For Figure 3 The partial structure diagram of the circle A is shown in the figure.

[0021] Figure mark:

[0022] 10-pull rod joint;11-groove;111-first welding surface;112-second welding surface;121-first perforation;122-second perforation;13-connector;131-internal thread;14-connection hole;20-first strain gauge;21-first wiring groove;211-connection section;22-first wire outlet hole;23-adhesive layer;30-second strain gauge;31-second wiring groove;32-second wire outlet hole;40-gap;50-fiber bragg grating;51-detection section;52-fiber core;53-coating layer;531-gap;60-pull rod;61-external thread. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0024] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, "first", "second", "third", "fourth" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] like Figures 1 to 4 As shown, this utility model discloses a stress-detectable tie rod connector for connecting to a tie rod 60. The aforementioned stress-detectable tie rod connector includes a tie rod connector 10, a first strain gauge 20, a second strain gauge 30, and a fiber Bragg grating 50. The tie rod connector 10 has a groove 11, and the bottom surface of the inner side of the groove 11 has a through hole penetrating the tie rod connector 10. The first strain gauge 20 and the second strain gauge 30 are respectively fixed to both ends of the inner side of the groove 11, specifically, the far ends of the first strain gauge 20 and the second strain gauge 30 are fixed to the inner side of the groove 11, forming a gap 40 between the first strain gauge 20 and the second strain gauge 30. The fiber Bragg grating 50 is fixed to the upper end face of the first strain gauge 20 and the second strain gauge 30, and both ends of the fiber Bragg grating 50 extend out of the tie rod connector 10 through the through hole. The fiber Bragg grating 50 includes a detection section 51, which is disposed within the gap 40 between the first strain gauge 20 and the second strain gauge 30.

[0027] At work, such as Figure 1 As shown, the leads at both ends of the fiber optic grating 50 pass through the pull rod connector 10 and connect to the detection equipment. The pull rod connector 10 is connected to the pull rod 60. When the pull rod connector 10 is subjected to stress changes, the fiber optic grating 50 will be subjected to corresponding stress changes, which will lead to a change in the peak wavelength of the reflected light from the detection section 51 of the fiber optic grating 50. The detection equipment detects the amount of wavelength change to obtain the stress condition and performs stress detection on the pull rod 60 to monitor the safety of its use. The above-mentioned stress detection structure has low installation difficulty and ensures the accuracy of stress data detection. In addition, the far ends of the first strain gauge 20 and the second strain gauge 30 are fixed to the pull rod connector 10, leaving a sufficient gap 40 between the first strain gauge 20 and the second strain gauge 30, increasing the tensile amount of the detection section 51 and reducing the problem of large detection data errors due to insufficient tensile amount.

[0028] Please see Figure 2The pull rod joint 10 comprises a connecting head 13, and an inner thread 131 is arranged on the inner side of the connecting head 13. An outer thread 61 corresponding to the outer wall of the pull rod 60 is arranged on the outer side of the connecting head 13. The outer thread 61 is engaged with the inner thread 131, so that the pull rod 60 is connected with the pull rod joint 10. In addition, the pull rod joint 10 further comprises a connecting hole 14 for connecting the building structure. The groove 11 is arranged along the length direction of the pull rod joint 10. The inner side of the groove 11 comprises a first welding surface 111 and a second welding surface 112 which are oppositely arranged along the length direction of the pull rod joint 10. The first strain gauge 20 is fixedly connected with the first welding surface 111 through welding, and the second strain gauge 30 is fixedly connected with the second welding surface 112 through welding. It should be noted that the connection mode of the first strain gauge 20 and the second strain gauge 30 with the pull rod joint 10 is not limited to welding, and the connection performance is ensured. In the embodiment, the number of perforations in the bottom surface of the groove 11 is two, which are a first perforation 121 and a second perforation 122, so that the two end pins of the fiber Bragg grating 50 can be drawn out. It should be noted that the number of perforations is only required to be at least one, and is not limited to two, and the fiber Bragg grating 50 is ensured to be drawn out.

[0029] Please refer to Figure 1 and Figure 3 In the embodiment, the first strain gauge 20 and the second strain gauge 30 are both cuboids. The shapes of the first strain gauge 20 and the second strain gauge 30 can also be adjusted according to the shape of the groove 11, and are not limited to rectangles. Meanwhile, the upper end surface of the first strain gauge 20 is provided with a first wiring groove 21 extending along the length direction of the pull rod joint 10. The upper end surface of the second strain gauge 30 is provided with a second wiring groove 31 extending along the length direction of the pull rod joint 10. The first strain gauge 20 is further provided with a first wire outlet hole 22 in communication with the first wiring groove 21. The second strain gauge 30 is further provided with a second wire outlet hole 32 in communication with the second wiring groove 31. The fiber Bragg grating 50 is fixed in the first wiring groove 21 and the second wiring groove 31, and the two end pins are drawn out from the first wire outlet hole 22 and the second wire outlet hole 32 respectively. The first wire outlet hole 22 is coaxially arranged with the first perforation 121, and the second wire outlet hole 32 is coaxially arranged with the second perforation 122, so as to facilitate the drawing of the fiber Bragg grating 50. In the embodiment, the first wiring groove 21 and the second wiring groove 31 both extend along the length direction of the pull rod joint 10, so that the fiber Bragg grating 50 is arranged along the axial direction of the pull rod 60, so as to facilitate the acquisition of the tensile stress of the pull rod 60.

[0030] Specifically, the first wiring slot 21 and the second wiring slot 31 each include a connecting section 211, and an adhesive layer 23 is arranged in the connecting section 211; the fiber grating 50 includes a fiber core 52 and a coating layer 53 arranged in layers from inside to outside; the coating layer 53 is provided with a notch 531 so that the fiber core 52 on the inside is exposed; the part of the fiber grating 50 provided with the notch 531 is arranged in the connecting section 211, so that the fiber core 52 is directly connected with the adhesive layer 23. In this embodiment, the adhesive layer 23 is a glue layer; when the fiber grating 50 is fixed, the fiber grating 50 located in the connecting section 211 needs to remove the coating layer 53 on the surface to form the notch 531 and expose the fiber core 52, and then glue is injected in the connecting section 211, so that the adhesive layer 23 (i.e. the glue layer) is bonded with the fiber core 52, thereby improving the bonding strength of the fiber grating 50.

[0031] The assembling method of the stress-detectable pull rod joint is as follows: the fiber grating 50 is arranged in the wiring slot 21, and the two end pins of the fiber grating 50 are extended out through the wire outlet hole 22; the distal ends of the first strain gauge 20 and the second strain gauge 30 are welded to the two ends on the inside of the groove 11, so that the gap 40 between the first strain gauge 20 and the second strain gauge 30 is ensured; then the coating layer 53 on the surface of the fiber grating 50 located in the connecting section 211 is removed, and a glue layer is injected in the connecting section 211 to form the adhesive layer 23, so as to fix the fiber grating 50.

[0032] Compared with the prior art, the stress-detectable pull rod joint comprises a pull rod joint 10, a first strain gauge 20, a second strain gauge 30 and a fiber grating 50; the first strain gauge 20 and the second strain gauge 30 are respectively fixed to the two ends on the inside of the groove 11 of the pull rod joint 10; the fiber grating 50 is fixed in the wiring slot 21 on the upper end surface of the first strain gauge 20 and the second strain gauge 30; the two end leads of the fiber grating 50 pass through the pull rod joint 10, so as to be connected with a detection device to read stress data; the fiber grating 50 is used to detect stress, the advantages of high sensitivity and strong anti-electromagnetic interference ability of the fiber grating 50 are fully utilized, the detection precision is improved, and the installation difficulty is reduced; the distal ends of the first strain gauge 20 and the second strain gauge 30 are fixed to the pull rod joint 10, so as to increase the stretching amount of the detection section 51 of the fiber grating 50 located in the gap 40, thereby avoiding large detection errors caused by too small stretching amount; in addition, the fiber grating 50 is fixed by glue, the coating layer 53 on the surface of the fiber grating 50 at the glue injection position is removed, the fiber core 52 in the inside is directly contacted with the glue, and the bonding strength of the fiber grating 50 is ensured.

[0033] The above merely expresses the preferred technical solutions of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and the present application also intends to include these changes and modifications.

Claims

1. A stress-detectable tie rod joint, characterized in that, The device includes a pull rod connector, a first strain gauge, a second strain gauge, and a fiber Bragg grating. The pull rod connector has a groove, and the bottom surface of the inner side of the groove has a through hole that penetrates the pull rod connector. The first strain gauge and the second strain gauge are respectively fixed to the two ends of the inner side of the groove, and a gap is formed between the first strain gauge and the second strain gauge. The fiber Bragg grating is fixed to the upper end surface of the first strain gauge and the second strain gauge, and the two ends of the fiber Bragg grating pass through the through hole and out of the pull rod connector.

2. The stress-detectable tie rod joint according to claim 1, characterized in that, The groove extends along the length of the tie rod joint; the inner side of the groove includes a first welding surface and a second welding surface that are arranged opposite to each other along the length of the tie rod joint; the first strain gauge is fixedly connected to the first welding surface, and the second strain gauge is fixedly connected to the second welding surface.

3. The stress-detectable tie rod joint according to claim 1, characterized in that, The first strain gauge and the second strain gauge are cuboids.

4. The stress-detectable tie rod joint according to claim 1, characterized in that, The upper end face of the first strain gauge is provided with a first wiring groove extending along the length direction of the tie rod joint; the upper end face of the second strain gauge is provided with a second wiring groove extending along the length direction of the tie rod joint; the first wiring groove and the second wiring groove are used to accommodate the fiber grating.

5. The stress-detectable tie rod joint according to claim 4, characterized in that, The first strain gauge has a first outlet hole that communicates with the first wiring groove; the second strain gauge has a second outlet hole that communicates with the second wiring groove; and the two ends of the fiber optic grating pass through the first outlet hole and the second outlet hole, respectively.

6. The stress-detectable tie rod joint according to claim 5, characterized in that, The perforation includes a first perforation and a second perforation; the first perforation is coaxially arranged with the first outlet hole, and the second perforation is coaxially arranged with the second outlet hole.

7. The stress-detectable tie rod joint according to claim 4, characterized in that, Both the first and second wiring channels include a connecting section, and the connecting section contains an adhesive layer; the fiber grating includes a fiber core and a coating layer stacked from the inside to the outside; the coating layer has a notch to expose the fiber core; the notch is located in the connecting section to connect the fiber core to the adhesive layer.

8. The stress-detectable tie rod joint according to claim 1, characterized in that, The fiber grating includes a detection section, which is disposed in the gap between the first strain gauge and the second strain gauge.

9. The stress-detectable tie rod joint according to claim 1, characterized in that, The pull rod connector includes a connector head, the inner side of which is provided with an internal thread for connecting with the pull rod.

10. The stress-detectable tie rod joint according to claim 1, characterized in that, The tie rod joint includes a connection hole for structural connection.

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