Fiber bragg grating clamping device suitable for pipeline inner wall strain monitoring

Abstract

The utility model relates to the technical field of pipe jacking line fittings, in particular to a fiber bragg grating clamping device suitable for pipeline inner wall strain monitoring, which comprises a lower seat and an upper seat, the upper seat is detachably mounted on the lower seat, a clamping through hole used for clamping a fiber bragg grating sensor is arranged on the combination surface of the upper seat and the lower seat, and the clamping through hole is communicated with the clamping through hole. And the bottom of the lower seat is adhered to the inner wall of the pipeline. The fiber bragg grating clamping device suitable for pipeline inner wall strain monitoring achieves convenient installation and nondestructive monitoring of a fiber bragg grating sensor on the pipeline inner wall, effectively protects the sensor, improves the repeated utilization rate of the sensor, has the advantages of being high in adaptability and stability, simple in structure, easy to maintain and the like, and is suitable for popularization and application. And an efficient and reliable solution is provided for monitoring the strain of the inner wall of the pipeline.

Description

Technical Field

[0001] This utility model relates to the technical field of pipeline accessories for pipe jacking, and specifically to a fiber optic grating clamping device suitable for strain monitoring of the inner wall of a pipeline. Background Technology

[0002] In pipeline engineering and operation and maintenance management, strain monitoring of the pipeline inner wall is a crucial step in ensuring pipeline safety and preventing accidents. Fiber optic strain sensors, as an advanced monitoring technology, are widely used in pipeline strain monitoring due to their high precision, high stability, and good durability. These sensors can measure the deformation of pipelines under stress in real time and accurately, providing important data support for pipeline health status assessment.

[0003] However, in practical applications, the method of fixing fiber Bragg grating strain sensors has become a pressing issue. Traditionally, operators typically use high-strength adhesives to directly attach the sensors to the inner wall of the pipe. While this method is simple and easy to implement, it has significant drawbacks. On the one hand, the bonding quality of the adhesive directly affects the sensor's fixation strength and the accuracy of the monitoring data; on the other hand, when the monitoring task is completed or the sensor needs to be replaced, the disassembly process often damages the sensor, reducing its reusability and increasing operating costs.

[0004] Furthermore, traditional fixing methods struggle to balance the requirements of fixation strength and easy reuse. Once the adhesive cures, disassembly is not only cumbersome but also prone to damaging the pipe's inner wall and the sensor. This limitation is particularly pronounced in scenarios requiring long-term monitoring or frequent sensor replacements.

[0005] Therefore, there is an urgent need for a fixing device that can firmly fix fiber optic strain sensors to the inner wall of pipelines, while also allowing for easy disassembly without damaging the sensor or the pipeline wall. This would meet the actual needs of pipeline strain monitoring and improve monitoring efficiency and sensor reusability. Utility Model Content

[0006] To address the aforementioned problems, this utility model provides a fiber optic grating clamping device suitable for strain monitoring of the inner wall of a pipeline.

[0007] The technical solution of this utility model is as follows:

[0008] A fiber Bragg grating clamping device suitable for strain monitoring of pipeline inner wall includes a lower seat and an upper seat. The upper seat is detachably mounted on the lower seat. A clamping through hole for clamping the fiber Bragg grating sensor is provided on the mating surface of the upper seat and the lower seat. The bottom of the lower seat is bonded to the inner wall of the pipeline.

[0009] The upper seat is fixedly connected to the lower seat by bolts.

[0010] The tightening torque of the bolts is limited to 0.5-1.5 N·m.

[0011] A threaded through hole is provided on the lower seat, and an assembly through hole is provided on the upper seat at a position corresponding to the threaded through hole. The bolt passes through the assembly through hole and engages with the threaded through hole to fasten the upper seat to the lower seat.

[0012] An elastic rubber layer is provided on the inner wall of the clamping through hole.

[0013] The clamping through hole consists of a lower through groove on the lower seat and an upper through groove on the upper seat.

[0014] The lower and upper seats are made of aluminum alloy.

[0015] Surface oxidation treatment of the lower and upper seats.

[0016] The bottom of the lower seat is designed with an arc-shaped bottom surface that matches the radius of curvature of the inner wall of the pipe.

[0017] The curved bottom surface is attached to the inner wall of the pipe with adhesive.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model discloses a fiber optic grating clamping device suitable for strain monitoring of pipeline inner walls. The fiber optic grating clamping device for strain monitoring of pipeline inner walls tightly fits the arc-shaped bottom surface of the lower seat with the inner wall of the pipeline, achieving stable installation of the fiber optic grating sensor without drilling or complex mechanical fixing structures. The upper seat and the lower seat are connected by bolts, and the design of the clamping through hole allows the sensor to be easily clamped on the inner wall of the pipeline without restricting or deforming the pipeline, thus realizing non-destructive monitoring of the pipeline.

[0020] 2. This utility model discloses a fiber optic grating clamping device suitable for strain monitoring of pipeline inner walls. This device effectively absorbs the impact of pipeline vibration on the sensor through an elastic rubber layer set on the inner wall of the clamping through-hole, protecting the sensor from damage. The bolt tightening torque is limited to 0.5-1.5 N·m to prevent excessive clamping and damage to the sensor, ensuring the sensor's safety and integrity. The modular design allows the sensor to be easily disassembled and reinstalled after the monitoring task is completed, significantly improving the sensor's reusability.

[0021] 3. The present invention discloses a fiber optic grating clamping device suitable for strain monitoring of the inner wall of a pipeline. The radius of curvature of the arc-shaped bottom surface of the lower seat of the fiber optic grating clamping device can be changed according to the pipeline radius, so that the clamping device can adapt to pipelines of different diameters and enhance its versatility. The aluminum alloy material and surface oxidation treatment improve the corrosion resistance and stability of the clamping device, enabling it to operate stably for a long time under complex working conditions.

[0022] 4. The present invention discloses a fiber optic grating clamping device suitable for strain monitoring of the inner wall of a pipeline. The fiber optic grating clamping device suitable for strain monitoring of the inner wall of a pipeline has a simple structure and consists of a small number of parts such as a lower seat, an upper seat, and bolts, making it easy to manufacture and assemble. The semi-enclosed structure design of the clamping channel makes the installation and disassembly of the sensor more convenient and reduces maintenance costs. Attached Figure Description

[0023] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0024] In the attached diagram:

[0025] Figure 1 This is an exploded structural diagram of a fiber optic grating clamping device suitable for monitoring strain on the inner wall of a pipeline, according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the assembly structure of a fiber optic grating clamping device suitable for monitoring strain on the inner wall of a pipeline, according to an embodiment of this utility model.

[0027] Figure 3 This is a schematic diagram of the assembly structure of a fiber optic grating clamping device for monitoring strain on the inner wall of a pipeline according to an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of a fiber optic grating clamping device for monitoring strain on the inner wall of a pipeline during use in an embodiment of the present invention.

[0029] The components represented by the various reference numerals in the diagram are:

[0030] This utility model includes: 1. lower seat, 2. upper seat, 3. clamping through hole, 4. bolt, 5. arc-shaped bottom surface, 6. lower through groove, 7. upper through groove, 8. threaded through hole, and 9. assembly through hole. Detailed Implementation

[0031] like Figure 1 and Figure 2A fiber optic grating clamping device suitable for strain monitoring of the inner wall of a pipeline includes a lower seat 1 and an upper seat 2. The upper seat 2 is detachably mounted on the lower seat 1 and is fastened by bolts 4. A clamping through hole 3 is provided on the mating surface of the upper seat 2 and the lower seat 1 for clamping the fiber optic grating sensor. The bottom of the lower seat 1 is set into an arc-shaped bottom surface 5 that matches the radius of curvature of the inner wall of the pipeline and is attached to the inner wall of the pipeline by an adhesive.

[0032] like Figure 3 and Figure 4 As shown, during use, two fiber optic grating clamping devices suitable for strain monitoring of the inner wall of the pipe are set opposite each other to clamp the two ends of the fiber optic grating sensor, while the arc-shaped bottom surfaces 5 of the two lower seats 1 are set opposite each other on the two inner arc surfaces of the inner wall of the pipe.

[0033] The bottom of the lower seat 1 is designed with an arc-shaped bottom surface 5, the radius of curvature of which can be customized according to the radius of different pipes to ensure a tight fit with the inner wall of the pipe. The design of the arc-shaped bottom surface 5 allows the clamping device to adapt to pipes of different diameters, enhancing its versatility.

[0034] A lower through groove 6 is provided horizontally on the top surface of the lower seat 1 for placing a fiber Bragg grating sensor. The curvature of the lower through groove 6 matches the outer diameter of the fiber Bragg grating sensor to ensure the stability of the sensor during the clamping process.

[0035] Threaded through holes 8 are provided on both sides of the lower seat 1 to mate with the assembly through holes 9 on the upper seat 2, and the upper seat 2 and the lower seat 1 are fastened together by bolts 4.

[0036] An upper through groove 7 is provided on the bottom surface of the upper seat 2, which is adapted to the lower through groove 6 on the lower seat 1 to form a clamping through hole 3. The curvature of the upper through groove 7 is also matched with the outer diameter of the fiber optic grating sensor to ensure the stability of the clamping.

[0037] Assembly through holes 9 are provided on both sides of the upper seat 2, corresponding to the threaded through holes 8 on the lower seat 1, for passing through bolts 4 to connect the upper seat 2 and the lower seat 1.

[0038] Bolt 4 is used to fasten the upper seat 2 to the lower seat 1, and the fiber Bragg grating sensor is clamped by tightening bolt 4. In order to prevent damage to the sensor by over-clamping, the tightening torque of bolt 4 is limited to between 0.5-1.5 N·m.

[0039] An elastic rubber layer (not shown in the figure) is provided on the inner wall of the clamping through hole 3 to absorb the impact of pipeline vibration on the sensor and protect the sensor from damage.

[0040] Both the lower seat 1 and the upper seat 2 are made of lightweight aluminum alloy, which has the advantages of being lightweight, high-strength, and corrosion-resistant.

[0041] The surfaces of the lower seat 1 and the upper seat 2 are oxidized to improve their corrosion resistance and extend their service life.

[0042] The installation steps for this fiber optic grating clamping device, suitable for strain monitoring of pipeline inner walls, are as follows:

[0043] First, mark the installation position on the inner wall of the pipe to ensure that the clamping device can be accurately installed on the strain point to be monitored. Then, use adhesive to attach the arc-shaped bottom surface 5 of the lower seat 1 to the inner wall of the pipe, ensuring that the lower seat 1 is in close contact with the inner wall of the pipe and is firmly fixed. Next, place the fiber optic strain sensor into the lower through groove 6 of the lower seat 1, ensuring that the sensor is centered and in close contact with the arc of the lower through groove 6. Align the upper through groove 7 of the upper seat 2 with the lower through groove 6 of the lower seat 1 to ensure that the clamping through hole 3 forms a complete clamping space. Finally, pass the bolt 4 through the assembly through hole 9 of the upper seat 2 and screw it into the threaded through hole 8 of the lower seat 1, gradually tightening the bolt 4 to make the upper seat 2 and the lower seat 1 tightly connected and clamp the fiber optic strain sensor. During the tightening process, pay attention to the tightening torque of the bolt 4 to avoid over-tightening and damage to the sensor.

[0044] When the sensor needs to be disassembled, simply loosen bolt 4 in the reverse direction and remove the upper seat 2 from the lower seat 1 to easily remove the fiber optic strain sensor. Since the clamping device is attached to the inner wall of the pipe with adhesive and the bonding area is small (only the arc-shaped bottom surface 5), the pipe will not be damaged during disassembly. At the same time, since the clamping device adopts a modular design, the sensor will not be damaged during disassembly, ensuring the reusability of the sensor.

[0045] This fiber optic grating clamping device for monitoring strain on the inner wall of pipelines achieves non-destructive fixing of the sensor to the inner wall of the pipeline through the structural design of the arc-shaped bottom surface 5 and the clamping bolts 4. It eliminates the influence of traditional adhesives on sensor performance and avoids binding deformation of the pipeline. The clamping device adopts a modular design, and the installation and disassembly process is simple and quick without damaging the sensor or pipeline structure, which significantly improves the reusability of the sensor. The elastic rubber layer set on the inner wall of the clamping through hole 3 can absorb the impact of pipeline vibration on the sensor and protect the sensor from damage. The radius of curvature of the arc-shaped bottom surface 5 of the lower seat 1 can be changed according to the pipeline radius, so that the clamping device can adapt to pipelines of different diameters and enhance its versatility. The aluminum alloy material and surface oxidation treatment improve the corrosion resistance and stability of the clamping device, enabling it to operate stably for a long time under complex working conditions. The modular design and convenient installation and disassembly of the clamping device reduce production and maintenance costs, making it easy to promote and use on a large scale.

Claims

1. A fiber grating clamping device suitable for in-pipe inner wall strain monitoring, characterized in that, It comprises a lower seat (1) and an upper seat (2), the upper seat (2) is detachably mounted on the lower seat (1), a clamping through hole (3) for clamping a fiber grating sensor is arranged on the joint surface of the upper seat (2) and the lower seat (1), and the bottom of the lower seat (1) is bonded to the inner wall of a pipeline. 2.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 1, wherein, The upper seat (2) is fixedly connected to the lower seat (1) by a bolt (4). 3.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 2, characterized in that, The tightening torque of the bolt (4) is limited to 0.5-1.5 N·m. 4.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 2, characterized in that, A threaded through hole (8) is arranged on the lower seat (1), an assembly through hole (9) is arranged on the upper seat (2) at a position corresponding to the threaded through hole (8), the bolt (4) is screwed into the threaded through hole (8) through the assembly through hole (9) to fasten the upper seat (2) to the lower seat (1).

5. The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 1, characterized in that, An elastic rubber layer is arranged on the inner wall of the clamping through hole (3). 6.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 1, wherein, The clamping through hole (3) is composed of a lower through groove (6) arranged on the lower seat (1) and an upper through groove (7) arranged on the upper seat (2). 7.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 1, wherein, The lower seat (1) and the upper seat (2) are made of aluminum alloy. 8.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 7, characterized in that, The surfaces of the lower seat (1) and the upper seat (2) are subjected to oxidation treatment. 9.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 1, wherein, The bottom of the lower seat (1) is arranged as an arc-shaped bottom surface (5) matching the curvature radius of the inner wall of the pipeline. 10.The fiber grating clamping device for monitoring strain of inner wall of a pipeline according to claim 9, wherein, The arc-shaped bottom surface (5) is attached to the inner wall of the pipeline by an adhesive.

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