Civil engineering fiber grating expansion joint testing device
By using rectangular frames and sliders in civil engineering, the fiber optic grating sensor can be quickly installed and flexibly adjusted, solving the problem that existing technologies cannot comprehensively monitor multiple locations of expansion joints, and realizing comprehensive testing and monitoring of expansion joints in civil engineering buildings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG HUITONG CONSTR GRP CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-23
AI Technical Summary
Existing technologies cannot flexibly test and monitor multiple locations of expansion joints in civil engineering buildings, nor can they fully understand the expansion and contraction at various locations of the expansion joints.
The system utilizes a combination of a rectangular frame, slider, mounting block, mounting parts, socket, sliding hole, insertion shaft, and spring to achieve rapid installation of fiber Bragg grating sensors. Adjustment via threaded shaft and nut allows for the installation of fiber Bragg grating sensors of different sizes, ensuring flexibility and accuracy in testing and monitoring.
It enables flexible testing and monitoring of multiple locations of civil expansion joints, providing a comprehensive understanding of the expansion and contraction at each location, thus increasing its application range and installation flexibility.
Smart Images
Figure CN224398585U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building expansion joint testing technology, specifically a fiber optic grating expansion joint testing device for civil engineering. Background Technology
[0002] Fiber Bragg grating (FBG) sensors are a type of fiber optic sensor. The sensing process based on FBGs obtains sensing information by modulating the Bragg wavelength of the fiber optic cable with external physical parameters; it is a wavelength-modulated fiber optic sensor. Expansion joints in civil engineering buildings, also known as expansion joints, are structural joints installed vertically at appropriate locations along the length of a building to prevent cracks or damage caused by changes in climate temperature (thermal expansion and contraction). To ensure building safety, FBG sensors are needed to monitor the condition of building expansion joints in a timely and accurate manner.
[0003] The published patent document CN218455665U discloses a fiber optic grating expansion joint testing device for civil engineering. This patent involves activating an electric telescopic rod and heating plate, causing them to slide down and contact the area around the expansion joint for heating. The scale at the top of the scale axis is observed. After heating for a period of time, the scale at the top of the scale axis is observed to see if it changes. If it changes, it indicates that the ground's thermal expansion has reduced the gap. The elasticity of the first spring shortens the distance between the two compression plates, causing the scale axis to change, thus indicating that the expansion joint is usable. Conversely, if there is no change, it indicates that the gap does not have a protective function against thermal expansion and contraction, thereby improving the device's practicality. However, because expansion joints are relatively long, the aforementioned patent document cannot flexibly test and monitor multiple locations of the expansion joint in actual use, and cannot comprehensively understand the expansion and contraction situation at various locations of the expansion joint. Utility Model Content
[0004] The purpose of this invention is to provide a fiber optic grating expansion joint testing device for civil engineering, which solves the problems mentioned in the background art.
[0005] This application provides a fiber Bragg grating expansion joint testing device for civil engineering, including a civil expansion joint and several fiber Bragg grating sensors. A rectangular frame is provided on the top of the buildings on both sides of the civil expansion joint. Several sliders are slidably connected inside the rectangular frame. Mounting components are provided on the sliders. Each fiber Bragg grating sensor is positioned between two sliders laterally. Mounting blocks are symmetrically fixedly connected to both ends of each fiber Bragg grating sensor. The mounting components are adapted to the mounting blocks, and insertion holes are provided on both the front and rear sides of the mounting components. Sliding holes are symmetrically provided on the front and rear sides of the mounting blocks. Insertion shafts matching the insertion holes are slidably connected inside the sliding holes. One end of the insertion shaft is inside the sliding hole, and a spring is fixedly connected to the other end of the insertion shaft. One end of the spring is fixedly connected to the inner wall of the sliding hole.
[0006] By adopting the above technical solution, a force is applied to the insertion shaft into the sliding hole, causing the insertion shaft to squeeze the spring and fully enter the sliding hole. Then, the two mounting blocks of the fiber grating sensor are placed inside the corresponding two mounting parts. The spring drives the insertion shaft to reset, so that one end of the insertion shaft passes through the insertion hole, thus completing the rapid installation of the fiber grating sensor. Multiple fiber grating sensors can be installed along the rectangular frame, allowing for flexible testing and monitoring of multiple locations of civil expansion joints.
[0007] Optionally, the front and rear sides of the top of the slider are symmetrically fixedly connected with connecting ears, and two threaded shafts are rotatably installed on one side of the mounting component. The threaded shafts pass through the connecting ears and are connected to the connecting ears by threads.
[0008] By adopting the above technical solution, the position of the threaded shaft connected to the connecting ear thread can be adjusted laterally when the threaded shaft is rotated, thereby adjusting the position of the mounting part to suit the installation of fiber optic grating sensors of different sizes.
[0009] Optionally, the rectangular frame has grooves on both sides, the slider is located inside the two grooves, and a threaded shaft is threaded through and connected to the slider. Both ends of the threaded shaft are fitted with matching nuts.
[0010] By adopting the above technical solution, the position of the slider can be fixed by adjusting the position of the slider inside the rectangular frame and the groove, and then locking it by rotating the second nut, thus ensuring that the installation position of the fiber optic grating sensor does not change.
[0011] Optionally, two matching nuts are fitted onto and threadedly connected to the threaded shaft, with the two nuts located on either side of the connecting lug.
[0012] By adopting the above technical solution, the position of the threaded shaft is guaranteed not to change, thus not affecting the test and monitoring results of the fiber optic grating sensor.
[0013] Optionally, gaskets are fitted at both ends of the threaded shaft.
[0014] By adopting the above technical solution, friction between the second nut and the rectangular frame is prevented during the slider locking process.
[0015] Optionally, several fixing plates are fixedly connected at equal intervals on both sides of the rectangular frame, and expansion screws are provided on the fixing plates. The fixing plates are connected to the top of the buildings on both sides of the civil expansion joint by expansion screws.
[0016] By adopting the above technical solution, it is convenient to fix the rectangular frame on the top of the building on both sides of the civil expansion joint.
[0017] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:
[0018] 1. The technical solution of this application, through the coordinated use of a rectangular frame, slider, mounting block, mounting component, insertion hole, sliding hole, insertion shaft and spring, can quickly install fiber optic grating sensors, making them easy to use. Furthermore, multiple fiber optic grating sensors can be installed along the rectangular frame, allowing for flexible testing and monitoring of multiple locations of civil expansion joints, thereby providing a more comprehensive understanding of the expansion and contraction of the civil expansion joints at various locations.
[0019] 2. The technical solution of this application uses a threaded shaft that is threaded to the connecting ear. By rotating the threaded shaft, the position of the threaded shaft can be adjusted laterally, thereby adjusting the position of the mounting part to accommodate the installation of fiber optic grating sensors of different sizes and increasing the range of applications. Attached Figure Description
[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;
[0023] Figure 3 This is a schematic diagram of the installation structure of the fiber Bragg grating sensor of this utility model;
[0024] Figure 4 This utility model Figure 1 Enlarged view of point B in the middle.
[0025] In the diagram: 1. Expansion joint; 2. Fiber optic grating sensor; 3. Rectangular frame; 4. Slider; 5. Mounting block; 6. Mounting component; 7. Threaded shaft one; 8. Connecting lug; 9. Insertion hole; 10. Sliding hole; 11. Insertion shaft; 12. Spring; 13. Slide groove; 14. Threaded shaft two; 15. Nut two; 16. Washer; 17. Nut one; 18. Fixing plate; 19. Expansion bolt. Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0027] Please see Figure 1-3 This utility model provides a fiber Bragg grating expansion joint testing device for civil engineering, including a civil expansion joint 1 and several fiber Bragg grating sensors 2. A rectangular frame 3 is provided on the top of the buildings on both sides of the civil expansion joint 1. Several sliders 4 are slidably connected inside the rectangular frame 3. Mounting parts 6 are provided on the sliders 4. Each fiber Bragg grating sensor 2 is located between two horizontal sliders 4. Mounting blocks 5 are symmetrically fixedly connected to both ends of the fiber Bragg grating sensor 2. The mounting parts 6 are adapted to the mounting blocks 5, and the front and rear sides of the mounting parts 6 are provided with insertion holes 9. The front and rear sides of the mounting blocks 5 are symmetrically provided with sliding holes 10. Insertion shafts 11 that match the insertion holes 9 are slidably connected inside the sliding holes 10. One end of the insertion shaft 11 is inside the sliding hole 10, and the other end of the insertion shaft 11 is fixedly connected to a spring 12. One end of the spring 12 is fixedly connected to the inner wall of the sliding hole 10.
[0028] In this technical solution, by applying a force to the insertion shaft 11 into the sliding hole 10, the insertion shaft 11 compresses the spring 12 and fully enters the sliding hole 10. Then, the two mounting blocks 5 of the fiber optic grating sensor 2 are placed inside the corresponding two mounting parts 6. The spring 12 drives the insertion shaft 11 to reset, so that one end of the insertion shaft 11 passes through the insertion hole 9, thus completing the quick installation of the fiber optic grating sensor 2. It is convenient to use, and multiple fiber optic grating sensors 2 can be installed along the rectangular frame 3, allowing for flexible testing and monitoring of multiple locations of the civil expansion joint 1, thereby providing a more comprehensive understanding of the expansion and contraction of the civil expansion joint 1 at various locations.
[0029] In some technical solutions, such as Figure 1 , Figure 3 and Figure 4 As shown, connecting ears 8 are symmetrically fixedly connected to the front and rear sides of the top of the slider 4. Two threaded shafts 7 are rotatably installed on one side of the mounting part 6. The threaded shafts 7 pass through the connecting ears 8 and are connected to the connecting ears 8 by threads.
[0030] In use, the position of the threaded shaft 7, which is threaded to the connecting ear 8, can be adjusted laterally by rotating the threaded shaft 7, thereby adjusting the position of the mounting part 6 to accommodate the installation of fiber optic grating sensors 2 of different sizes and increasing the range of applications.
[0031] In some technical solutions, such as Figure 1 and Figure 4 As shown, the rectangular frame 3 has grooves 13 on both sides, the slider 4 is located inside the two grooves 13 on both sides, and a threaded shaft 14 is threaded through and threaded to the slider 4. Both ends of the threaded shaft 14 are fitted with matching nuts 15.
[0032] In use, the position of slider 4 inside the rectangular frame 3 and the slide groove 13 is adjusted by sliding the slider 4, and then the second nut 15 is rotated to lock it, so as to fix the position of slider 4 and ensure that the installation position of fiber optic grating sensor 2 does not change.
[0033] In some technical solutions, such as Figure 4 As shown, two matching nuts 17 are fitted onto the threaded shaft 7 and threadedly connected to it, with the two nuts 17 located on both sides of the connecting lug 8.
[0034] During use, the position of the threaded shaft 7 is kept unchanged by using two nuts 17, so as not to affect the test and monitoring results of the fiber optic grating sensor 2.
[0035] In some technical solutions, such as Figure 4 As shown, gaskets 16 are respectively fitted at both ends of the threaded shaft 14.
[0036] During use, the shim 16 prevents friction between the nut 15 and the rectangular frame 3 during the locking process of the slider 4.
[0037] In some technical solutions, such as Figure 4 As shown, several fixing plates 18 are fixedly connected at equal intervals on both sides of the rectangular frame 3. Expansion screws 19 are provided on the fixing plates 18. The fixing plates 18 are connected to the top of the buildings on both sides of the civil expansion joint 1 through the expansion screws 19.
[0038] In use, the rectangular frame 3 can be easily fixed to the top of the building on both sides of the civil expansion joint 1 by means of the expansion screws 19 of the fixing plate 18.
[0039] Working principle: During installation, firstly, the threaded shaft 7 is rotated according to the length of the fiber Bragg grating sensor 2 and the width of the civil expansion joint 1. Since the threaded shaft 7 is threadedly connected to the connecting lug 8, the position of the threaded shaft 7 can be adjusted laterally, thereby adjusting the position of the mounting part 6 to accommodate the installation of fiber Bragg grating sensors 2 of different sizes. Then, a force is applied to the insertion shaft 11 into the sliding hole 10, causing the insertion shaft 11 to compress the spring 12 and fully enter the sliding hole 10. Next, the two mounting blocks 5 of the fiber Bragg grating sensor 2 are placed inside the corresponding two mounting parts 6. The spring 12 drives the insertion shaft 11 to reset, so that one end of the insertion shaft 11 passes through the insertion hole 9, thus completing the quick installation of the fiber Bragg grating sensor 2. It is convenient to use, and multiple fiber Bragg grating sensors 2 can be installed along the rectangular frame 3, allowing for flexible testing and monitoring of multiple locations of the civil expansion joint 1.
[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A fiber Bragg grating joint movement testing device for civil engineering, comprising a civil joint (1) and a plurality of fiber Bragg grating sensors (2), characterized in that: The top of the building on both sides of the civil expansion joint (1) is provided with a rectangular frame (3), the inside of the rectangular frame (3) is slidably connected with a plurality of sliding blocks (4), the sliding blocks (4) are provided with mounting pieces (6), each fiber grating sensor (2) is between two sliding blocks (4) in transverse direction, the fiber grating sensor (2) is symmetrically and fixedly connected with mounting blocks (5) at both ends, the mounting pieces (6) are matched with the mounting blocks (5), and the front and back sides of the mounting pieces (6) are provided with insertion holes (9), the front and back sides of the mounting blocks (5) are symmetrically provided with sliding holes (10), the sliding holes (10) are slidably connected with plug shafts (11) matched with the insertion holes (9), one end of the plug shaft (11) is in the inside of the sliding hole (10), and the other end of the plug shaft (11) is fixedly connected with a spring (12), one end of the spring (12) is fixedly connected with the inner wall of the sliding hole (10).
2. A fiber Bragg grating joint movement testing device for civil engineering according to claim 1, characterized in that, The front and back sides of the top of the sliding block (4) are symmetrically and fixedly connected with connecting ears (8), one side of the mounting piece (6) is rotatably provided with two threaded shafts (7), the threaded shafts (7) penetrate the connecting ears (8), and the threaded shafts (7) are connected with the connecting ears (8) through threads.
3. The FBG joint movement testing device for civil engineering of claim 1, wherein, Both sides of the rectangular frame (3) are provided with sliding grooves (13), both sides of the sliding block (4) are in the inside of the two sliding grooves (13), and the threaded shafts (14) are penetrated and threadedly connected on the sliding block (4), both ends of the threaded shafts (14) are matched with the second screw nuts (15).
4. The FBG joint movement testing device for civil engineering of claim 2, wherein, The threaded shafts (7) are matched with two first screw nuts (17) and are threadedly connected, and the two first screw nuts (17) are located on both sides of the connecting ears (8).
5. A fiber Bragg grating joint movement testing device for civil engineering according to claim 3, characterized in that, The threaded shafts (14) are matched with the gaskets (16) and are threadedly connected.
6. The fiber Bragg grating joint movement test apparatus for civil engineering of claim 1, wherein The rectangular frame (3) is fixedly connected with a plurality of fixed plates (18) at both sides, the fixed plates (18) are provided with expansion screws (19), and the fixed plates (18) and the top of the building on both sides of the civil expansion joint (1) are connected through the expansion screws (19).