Stress deformation monitoring device of power station underground chamber supporting structure

Abstract

The invention discloses a power station underground chamber supporting structure stress deformation monitoring device, which comprises a sensing optical fiber, a flexible sheath and a rigid sheath, and is characterized in that the supporting structure comprises anchor rod assemblies, a concrete covering layer and a steel frame, the steel frame is arranged in the concrete covering layer, the anchor rod assemblies are distributed at intervals along the length direction of a power station underground chamber, and the flexible sheath and the rigid sheath are arranged in the steel frame. Each anchor rod assembly comprises a plurality of anchor rods distributed in an inverted-U shape along the section of the side wall and the section of the top wall of the concrete covering layer, the tail ends of the anchor rods penetrate through the steel frame and extend into the inner wall of the power station underground chamber, base plates for pressing and fixing the steel frame are arranged on the anchor rods, and the flexible protective sleeves sequentially penetrate through the base plates and are connected between the rigid protective sleeves on the two sides. The sensing optical fiber is arranged in the flexible sheath, a plurality of inverted-U-shaped stress deformation monitoring belts which are distributed front and back at intervals are formed in the supporting structure through the sensing optical fiber, the sensing optical fiber is driven to deform when the supporting structure generates stress deformation, and response is more timely and accurate.

Description

Technical Field

[0001] This invention relates to the field of safety monitoring of underground tunnel support structures in power plants, and in particular to a stress and deformation monitoring device for underground tunnel support structures in power plants. Background Technology

[0002] Pumped storage power stations utilize surplus electricity from the grid during off-peak hours to pump water to upstream reservoirs, storing potential energy. During peak hours, they control the release of water from the upstream reservoirs to generate electricity, supplementing the power supply. This reduces the frequency of peak shaving for thermal power plants and lowers carbon emissions.

[0003] To improve the safety of underground chambers in power plants, a supporting structure is needed, using anchor bolts and concrete to support and protect the interior walls of these chambers. During use, this supporting structure is susceptible to stress deformation. While deformation is typically observed manually, some stress deformations in the supporting structure may not initially lead to obvious cracks or bulges, posing a safety hazard and requiring improvement. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a stress and deformation monitoring device for the support structure of underground chambers in power plants, thereby improving the level of automation by monitoring the stress and deformation of the support structure.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: providing a stress and deformation monitoring device for the support structure of an underground chamber of a power station, comprising: a sensing optical fiber, a flexible sheath, and a rigid sheath. The support structure includes anchor bolt assemblies, a concrete cover layer, and a steel frame. The concrete cover layer is disposed on the side walls and top walls of the underground chamber of the power station, and the steel frame is disposed within the concrete cover layer. The anchor bolt assemblies are spaced apart along the length of the underground chamber of the power station, and each set of anchor bolt assemblies includes several bolts with inverted cross-sections along the side walls and top walls of the concrete cover layer. The anchor bolts are arranged in a U-shape, with the head of the anchor bolt located in the concrete cover layer and the end of the anchor bolt penetrating the steel frame and extending into the inner wall of the underground chamber of the power station. The anchor bolts are equipped with pads to stabilize the steel frame. The rigid sheaths are located at the lower part of the two side walls of the concrete cover layer. The flexible sheaths are arranged in an inverted U-shape in the concrete cover layer and correspond one-to-one with the anchor bolt assemblies. The flexible sheaths penetrate the pads in sequence and are connected between the two rigid sheaths. The sensing optical fiber is arranged in the flexible sheath, and the two ends of the sensing optical fiber extend outward through the rigid sheath.

[0006] In a preferred embodiment of the present invention, the rigid sheath is made of steel pipe.

[0007] In a preferred embodiment of the present invention, the rigid sheath extends along the length of the underground chamber of the power station.

[0008] In a preferred embodiment of the present invention, the flexible sheath is provided with fiber paste.

[0009] In a preferred embodiment of the present invention, the pad is provided with an insertion hole corresponding to the flexible sheath.

[0010] In a preferred embodiment of the present invention, the pad is provided with a through hole corresponding to the anchor rod.

[0011] In a preferred embodiment of the present invention, the anchor head is provided with a limiting block, the length of which is greater than the diameter of the through hole.

[0012] In a preferred embodiment of the present invention, an optical fiber data processing system is further included. The optical fiber data processing system includes a light source, a photodetector, and a signal processing unit. The light source and the photodetector are respectively connected to the two ends of the sensing optical fiber. The photodetector is connected to the signal processing unit. The photodetector converts the optical signal into an electrical signal and sends it to the signal processing unit for signal processing. The signal processing unit analyzes the electrical signal to obtain the measurement result, thereby realizing the monitoring of stress deformation of the support structure.

[0013] In a preferred embodiment of the present invention, when the support structure undergoes stress deformation, the flexible sheath causes the sensing optical fiber to deform accordingly, resulting in a change in the period or refractive index of the grating in the sensing optical fiber, which leads to a wavelength shift of the light wave, which is then analyzed and converted into a stress deformation value.

[0014] The beneficial effects of this invention are as follows: The stress deformation monitoring device for the support structure of underground chambers in power plants disclosed in this invention forms multiple inverted U-shaped stress deformation monitoring bands with front and rear intervals in the support structure through sensing optical fibers. When stress deformation occurs in the support structure, it drives the deformation of the sensing optical fibers, and automatically monitors the deformation. The response is more timely and accurate, thereby improving the safety of the support structure of underground chambers in power plants. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of a preferred embodiment of the stress and deformation monitoring device for the support structure of an underground chamber in a power station according to the present invention. Figure 2 yes Figure 1 A magnified view of part A in the middle; Figure 3This is a schematic diagram of the working principle of the fiber optic data processing system in a stress and deformation monitoring device for the support structure of an underground chamber in a power station according to the present invention. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-3 The embodiments of the present invention include: like Figures 1-3 The stress and deformation monitoring device for the support structure of the underground chamber of the power station shown includes: a sensing optical fiber 9, a flexible sheath 7, a rigid sheath 8, and an optical fiber data processing system. The support structure includes an anchor bolt assembly, a concrete cover layer 1, and a steel frame 2. The concrete cover layer 1 is installed on the side walls and top walls of the underground chamber of the power station and has a high degree of fit with the side walls and top walls of the underground chamber of the power station.

[0018] A steel frame 2 is installed within the concrete cover layer 1 to support the side and top walls of the underground chamber of the power station. Anchor bolt assemblies are spaced apart along the length of the underground chamber. Each anchor bolt assembly includes several anchor bolts 4 arranged in an inverted U-shape along the cross-section of the side and top walls of the concrete cover layer 1. The heads of the anchor bolts 4 are located in the concrete cover layer 1, and the ends of the anchor bolts 4 penetrate the steel frame 2 and extend into the inner wall of the underground chamber, ensuring the stability of the support.

[0019] like Figure 2 As shown, the anchor rod 4 is provided with a pad 3 for pressing the steel frame 2. The pad 3 has a through hole corresponding to the anchor rod 4, which facilitates assembly. In this embodiment, a limiting block 5 is provided at the head of the anchor rod 4. The length of the limiting block 5 is greater than the diameter of the through hole, which presses the pad 3 to secure the steel frame 2, thereby improving the stability of the steel frame 2. In addition, the steel frame 2 can be composed of steel bars to form a frame structure, which is structurally stable and convenient for construction.

[0020] A rigid sheath 8 is installed at the lower part of both side walls of the concrete cover layer 1. The rigid sheath 8 is made of steel pipe, which has high strength and is not easily deformed. Figure 1 As shown, the flexible sheaths 7 are distributed in an inverted U-shape in the concrete cover layer 1 and correspond one-to-one with the anchor bolt assemblies. The flexible sheaths 7 pass through the pads 3 in sequence and connect between the rigid sheaths 8 on both sides, as shown. Figure 2 As shown, the pad 3 is provided with an insertion hole 6 corresponding to the flexible sheath 7, which facilitates the construction of the flexible sheath 7.

[0021] The rigid sheath 8 is equipped with a pipe fitting corresponding to the end of the flexible sheath 7, facilitating insertion and fixing. For example... Figure 2 As shown, the sensing optical fiber 9 is disposed in the flexible sheath 7, and the two ends of the sensing optical fiber 9 extend outward through the rigid sheath 8. In this embodiment, the rigid sheath 8 extends along the length direction of the underground chamber of the power station and can accommodate multiple sets of sensing optical fibers 9 extending from the flexible sheath 7.

[0022] A fiber grease is provided in the flexible sheath 7 to protect the sensing optical fiber 9 in the flexible sheath 7. The fiber grease has a good waterproof effect and suppresses the vibration of the supporting structure to the flexible sheath 7 and the sensing optical fiber 9, which helps to reduce the error in the stress deformation monitoring process.

[0023] like Figure 3 As shown, the fiber optic data processing system includes a light source, a photodetector, and a signal processing unit. The light source and photodetector are respectively connected to the two ends of the sensing fiber 9. The photodetector is connected to the signal processing unit. The photodetector converts the optical signal into an electrical signal and sends it to the signal processing unit for signal processing. The signal processing unit analyzes the electrical signal to obtain measurement results, thereby realizing the monitoring of stress deformation of the support structure. When the support structure does not undergo stress deformation, the flexible sheath 7 and the sensing fiber 9 in the flexible sheath 7 remain unchanged, recording the state of the electrical signal to form a normal state electrical signal database. Through active deformation tests of the sensing fiber 9, the state of the electrical signal under various degrees of deformation of the sensing fiber 9 is recorded to form an abnormal state electrical signal database.

[0024] In this embodiment, when the support structure undergoes stress deformation, the flexible sheath 7 causes the sensing fiber 9 to deform, resulting in a change in the period or refractive index of the grating in the sensing fiber 9, which leads to a wavelength drift of the light wave. Through analysis by the signal processing unit and comparison with the electrical signal database, the signal of the sensing fiber 9 is converted into a stress deformation value, thereby realizing automated stress deformation monitoring.

[0025] In summary, the stress and deformation monitoring device for the support structure of underground chambers in power plants disclosed in this invention can monitor the stress and deformation of the support structure, improve the level of automation and monitoring accuracy, facilitate timely detection of stress and deformation, facilitate rapid maintenance of the support structure, and enhance the safety of use.

[0026] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A stress-deformation monitoring device for the supporting structure of an underground chamber in a power plant, used for monitoring the stress-deformation of the supporting structure in an underground chamber of a power plant, characterized in that, include: The system comprises a sensing optical fiber, a flexible sheath, and a rigid sheath. The supporting structure includes anchor bolt assemblies, a concrete cover layer, and a steel frame. The concrete cover layer is installed on the side and top walls of the underground chamber of the power station. The steel frame is installed within the concrete cover layer. The anchor bolt assemblies are spaced apart along the length of the underground chamber. Each anchor bolt assembly includes several anchor bolts arranged in an inverted U-shape along the cross-section of the side and top walls of the concrete cover layer. The heads of the anchor bolts are located within the concrete cover layer, and the ends of the anchor bolts penetrate the steel frame and extend into the inner wall of the underground chamber. A pad is installed on each anchor bolt to secure the steel frame. The rigid sheath is installed at the lower part of both side walls of the concrete cover layer. The flexible sheath is arranged in an inverted U-shape within the concrete cover layer and corresponds one-to-one with the anchor bolt assemblies. The flexible sheath sequentially penetrates the pad and connects between the two rigid sheaths. The sensing optical fiber is installed within the flexible sheath, with both ends extending outwards through the rigid sheath.

2. The stress and deformation monitoring device for the underground chamber support structure of a power station according to claim 1, characterized in that, The rigid sheath is made of steel pipe.

3. The stress and deformation monitoring device for the underground chamber support structure of a power station according to claim 1, characterized in that, The rigid sheath extends along the length of the underground chamber of the power station.

4. The stress and deformation monitoring device for the underground chamber support structure of a power station according to claim 1, characterized in that, The flexible sheath contains fiber paste.

5. The stress and deformation monitoring device for the underground chamber support structure of a power station according to claim 1, characterized in that, The pad is provided with insertion holes corresponding to the flexible sheath.

6. The stress and deformation monitoring device for the underground chamber support structure of a power station according to claim 1, characterized in that, The pad is provided with through holes corresponding to the anchor rods.

7. The stress and deformation monitoring device for the underground chamber support structure of a power station according to claim 6, characterized in that, The anchor head is provided with a limiting block, the length of which is greater than the diameter of the through hole.

8. The stress and deformation monitoring device for the underground chamber support structure of a power station according to claim 1, characterized in that, It also includes an optical fiber data processing system, which includes a light source, a photodetector, and a signal processing unit. The light source and the photodetector are respectively connected to the two ends of the sensing optical fiber. The photodetector is connected to the signal processing unit. The photodetector converts the optical signal into an electrical signal and sends it to the signal processing unit for signal processing. The signal processing unit analyzes the electrical signal to obtain the measurement results and realizes the monitoring of stress deformation of the support structure.

9. The stress and deformation monitoring device for the support structure of the underground chamber of a power station according to claim 8, characterized in that, When the supporting structure undergoes stress deformation, the flexible sheath causes the sensing optical fiber to deform accordingly, resulting in changes in the period or refractive index of the grating in the sensing optical fiber, which leads to wavelength drift of the light wave. This is then analyzed and converted into stress deformation values.

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