A three-split capacitor support base structure and a method of constructing the same

Abstract

This invention discloses a three-split capacitor support foundation structure and its construction method, comprising a base plate, three-split columns, and an upper support platform. The three-split columns are evenly arranged along the circumference and correspond one-to-one with the three legs of the high-voltage capacitor. The upper support platform is located at the upper center of the three-split columns and is fixedly connected to the legs. The base plate is located below the three-split columns and is an integral self-healing reinforced concrete structure with expansion joints. The construction method forms an integral foundation through segmented casting. During the casting process, self-healing microcapsules and chemically activated components are pre-embedded in the concrete structure. By rationally setting the position and depth of the expansion joints, temperature stress release and automatic crack repair are synergistically controlled. The beneficial effects of this invention are: through segmented independent stress, the synergistic design of self-healing concrete and expansion joints, crack prevention, earthquake resistance, and material saving are integrated, significantly improving structural stability and service life, and ensuring safe equipment operation.

Description

Technical Field

[0001] This invention relates to the field of power engineering foundation design, and in particular to a three-split capacitor support foundation structure and its construction method. Background Technology

[0002] Existing high-voltage capacitors generally adopt a monolithic cast-in-place concrete foundation structure. This structure has strong integrity and can meet the load requirements of the equipment. However, during long-term operation of the equipment, micro-cracks are easily generated inside the foundation due to the influence of periodic vibration and diurnal temperature variation, which leads to a gradual decrease in crack resistance and durability, affecting operational stability.

[0003] The monolithic foundation has a large volume, requires a lot of concrete, has a long construction period, and is expensive. It not only increases the project cost, but also easily forms a conductive loop in a strong electromagnetic environment, generating a local eddy current effect, which leads to local temperature rise and energy loss, posing a potential threat to the long-term operational safety of electrical equipment.

[0004] Traditional concrete has limited self-healing ability in dry, windy, alkaline desert or Gobi regions with drastic temperature differences between day and night, and once cracks form, they are difficult to close.

[0005] To address the aforementioned issues, this invention proposes a three-segment capacitor-supported foundation structure based on chemically activated microcapsule self-healing concrete. Through segmented independent load-bearing design, layout of expansion joints in the base plate, and synergistic application of chemically activated and microcapsule composite self-healing concrete, automatic crack healing and stress release are achieved, significantly improving the foundation's crack resistance, seismic resistance, and durability, reducing concrete usage, and balancing structural safety with green building requirements. Summary of the Invention

[0006] The purpose of this invention is to provide a three-split capacitor support foundation structure and its construction method, which solves the problems of vibration stress concentration, difficult crack control, large material consumption, and easy cracking and eddy current generation caused by vibration and temperature changes during operation in high-voltage capacitor foundations.

[0007] The objective of this invention is achieved through the following technical solution: A three-split capacitor support foundation structure includes a base plate, three-split columns, and an upper support platform. The three-split columns are evenly arranged along the circumference and correspond one-to-one with the three legs of the high-voltage capacitor. The upper support platform is located at the upper center of the three-split columns and is fixedly connected to the legs. The base plate is located below the three-split columns and is an integral, self-healing reinforced concrete structure with the three-split columns. The base plate is provided with expansion joints to absorb deformation caused by temperature changes and equipment vibration.

[0008] Furthermore, the self-healing concrete of the self-healing reinforced concrete structure contains chemically activated components incorporated into the concrete and microcapsules encapsulating the repair agent.

[0009] Furthermore, the core material of the microcapsule is an epoxy resin-based repair agent or a modified polyurethane repair agent, the shell of the microcapsule is urea-formaldehyde resin or polyurethane, and the particle size of the microcapsule is 50–300 μm.

[0010] Furthermore, the chemically activated component is a silicate-based active mineral material, including one or more of metakaolin, slag powder, and fly ash.

[0011] Furthermore, the dosage of the chemically activated component is 5-12% of the mass of the concrete gel material, the dosage of the microcapsules is 0.5-2% of the mass of the concrete, and the mass ratio of the microcapsules to the chemically activated component is 1:5 to 1:10.

[0012] Furthermore, the upper support includes a steel plate pre-embedded in the three-part column and anchor bars passing through the steel plate.

[0013] Furthermore, the cross-section of the three-split column is circular or square, and it is equipped with vertical main reinforcement and circumferential distribution reinforcement inside. There are gaps between the three-split columns, and the internal reinforcement of the base plate is arranged in a cross pattern. The bottom anchor bars of the three-split column are connected to the main reinforcement of the base plate.

[0014] Furthermore, the expansion joints are filled with waterproof flexible sealant.

[0015] This invention also discloses a method for constructing the above-mentioned three-split capacitor support foundation structure, comprising the following steps: S1. Install expansion joints on the base plate at the designed locations; S2. Fix the steel reinforcement frame of the three-split column to the base plate in sequence and anchor it to the steel reinforcement in the base plate. S3. Fix the steel plate and anchor bars of the upper support to the steel reinforcement frame of the three-split column; S4. Pour concrete, incorporating microcapsules containing chemically activated components and encapsulating repair agents during the pouring process.

[0016] The present invention has the following advantages: 1. Significantly improved crack resistance and durability: By adopting a segmented independent load-bearing design and an expansion joint arrangement in the base plate, periodic vibration and temperature stress can be effectively dispersed, avoiding the generation and propagation of micro-cracks in traditional monolithic foundations, and significantly improving the crack resistance and structural durability of the foundation. 2. Enhanced operational safety and stability: The three-split structure reduces the overall conductive path, lowers the electromagnetic coupling effect, suppresses local eddy currents and temperature rise, and ensures the structural safety and thermal stability of the high-voltage capacitor during long-term operation. 3. Optimized material performance and enhanced self-healing ability: The main body of the foundation adopts chemically activated and microcapsule composite self-healing concrete, which can achieve automatic crack healing and strength recovery in dry and windy environments with large temperature differences between day and night, making up for the problem of insufficient self-healing ability of traditional concrete and extending the service life of the structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the state of the capacitor supporting the present invention.

[0018] Figure 2 This is a schematic diagram of the planar layout of the present invention.

[0019] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0020] In the diagram, 101 is the high-voltage capacitor, 201 is the base plate, 202 is the three-split column, 203 is the upper support platform, and 204 is the expansion joint. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, 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 an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1

[0028] refer to Figure 1-3 As shown, a three-split capacitor support foundation structure includes a high-voltage capacitor 101, a base plate 201, three-split columns 202, and an upper support platform 203. The three-split columns 202 are evenly arranged along the circumference, with each column corresponding to one of the three legs of the high-voltage capacitor 101 at 120° intervals. The upper support platform 203 is located at the upper center of the three-split columns 202 and is fixedly connected to the legs, serving to bear the load of the high-voltage capacitor 101. The base plate 201 is located below the three-split columns 202 and is an integral, self-healing reinforced concrete structure, used to fix each column unit and transfer the load to the foundation. An expansion joint 204 is provided on the base plate 201. The expansion joint 204 is used to absorb minor displacements caused by temperature changes and equipment vibrations, release concrete constraint stress, and prevent structural cracks from expanding. The expansion joint 204 is filled with a waterproof flexible material to ensure the sealing and durability of the support foundation structure under temperature and humidity changes.

[0029] Specifically, the three-segment column 202 is an independent segmented structure, with each column unit bearing its own load. A flexible connection is achieved through the base plate 201, allowing stress to be dispersed during uneven foundation settlement or equipment vibration. The three-segment layout constitutes a stable three-point support system, effectively improving the foundation's seismic performance and stability.

[0030] The self-healing reinforced concrete structure (base slab 201 and three-part column 202) of this embodiment comprises a chemically activated component and microcapsules encapsulating a repair agent. The core material of the microcapsules is an epoxy resin-based repair agent or a modified polyurethane repair agent, and the shell of the microcapsules is urea-formaldehyde resin or polyurethane. The particle size of the microcapsules is 50–300 μm. The chemically activated component is a silicate-based active mineral material, including one or more of metakaolin, slag powder, and fly ash. When microcracks develop in the supporting foundation structure during operation, the chemically activated component reacts with environmental moisture to generate hydrated calcium silicate gel. Under the stress of the cracks, the microcapsules rupture, releasing the epoxy repair agent. Both components together fill and seal the cracks, thereby achieving automatic crack healing and structural performance restoration. This composite repair system can maintain long-term repair activity in dry, windy, alkaline environments with large diurnal temperature variations, significantly improving foundation durability.

[0031] In practical implementation, the microcapsule dosage is 0.5%–2% of the concrete mass, and the chemically activated powder dosage is 5%–12% of the cementitious material mass, with a mass ratio of microcapsules to chemically activated components of 1:5–1:10. This ratio comprehensively considers both the self-healing effect and the maintenance of structural strength: too low a microcapsule dosage will result in insufficient crack repair capacity, while too high a dosage may reduce the mechanical properties of the concrete; too low a chemically activated powder dosage will make it difficult to form an effective cementitious reaction, while too high a dosage may cause early shrinkage risks. During the construction and curing stage, it is advisable to maintain the relative humidity of the concrete surface environment above 85% through covering, watering, or moisturizing curing, with a curing time of no less than 7 days, to ensure the initial activation effect of the self-healing system.

[0032] The upper foundation 203 includes steel plates embedded in the three-split columns 202 and anchor bars passing through the steel plates, thus forming a rigid-flexible structural system that can withstand vertical loads and adapt to dynamic stress changes caused by vibration during operation. The internal reinforcement of the base plate 201 is arranged in a cross pattern, and the bottom anchor bars of each three-split column 202 are connected to the main reinforcement of the base plate 201 to form an overall constraint.

[0033] The cross-section of the three-split column 202 can be circular or square, and it is internally reinforced with vertical main bars and circumferential distribution bars to enhance its resistance to bending, cracking, and seismic activity. Gaps are left between the three-split columns to avoid the accumulation of concrete confinement stress caused by thermal expansion and contraction.

[0034] Example 2

[0035] This embodiment provides a construction method for a three-split capacitor support foundation structure as described in Embodiment 1, including the following steps: S1. Based on the dimensions and load rating of the supporting foundation structure, prefabricate unit modules of the base plate 201 and the three-split column 202 respectively. Place the unit modules of the base plate 201 on the foundation and weld and anchor the steel bars after leveling. Pour in sections and set expansion joints according to the design location. The location and depth of the expansion joints are determined according to the design calculation. They are usually located at the centerline between the columns to ensure the uniformity of temperature stress release. By reasonably setting the location and depth of the expansion joints, the coordinated control of temperature stress release and automatic crack repair can be achieved. S2. Fix the steel reinforcement frame of the three-split column to the base plate in sequence, and anchor it to the steel reinforcement in the base plate by segmented casting or bolt connection. S3. Then fix the steel plate and anchor bars of the upper support to the steel frame of the three-split column. S4. Concrete pouring: During concrete pouring, the self-healing microcapsule material and chemically activated powder are mixed into the concrete mixture according to the proportions in Example 1, ensuring uniform distribution. During the curing stage, maintain moderate humidity to activate the initial repair mechanism; later, even in a dry environment, self-healing can still be achieved through capsule rupture.

[0036] After installation, the capacitor is fixed to the three legs of the upper support plate via the connecting parts of the upper support plate, forming a stable three-point support system.

[0037] Once the foundation is in operation, if microcracks are generated due to wind vibration or temperature changes, the chemically activated components react with air and moisture to generate gel products. The microcapsules rupture and release the repair agent, causing the cracks to automatically fill and close, thereby achieving long-term crack prevention and improved durability.

[0038] The three-segment foundation structure of this invention, through the synergistic effect of segmented independent stress, flexible release of expansion joints in the base slab, and self-healing concrete, effectively suppresses vibration stress concentration and thermal stress crack development while ensuring load-bearing capacity. This structure is suitable for supporting foundation engineering of three-legged electrical equipment for high-voltage capacitors, and is particularly suitable for use in arid and Gobi desert regions with large diurnal temperature differences, strong winds, and dry air. Compared with traditional monolithic cast-in-place concrete foundations, this invention significantly improves crack resistance and service life without increasing construction complexity, while reducing concrete usage and maintenance costs, aligning with green energy-saving and sustainable construction concepts.

[0039] Although the present invention 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 the present invention should be included within the protection scope of the present invention.

Claims

1. A three-split capacitor support foundation structure, characterized in that: The system includes a base plate, three-split columns, and an upper support platform. The three-split columns are evenly arranged along the circumference and correspond one-to-one with the three legs of the high-voltage capacitor. The upper support platform is located at the upper center of the three-split columns and is fixedly connected to the legs. The base plate is located below the three-split columns and is an integral self-healing reinforced concrete structure with the three-split columns. The base plate is provided with expansion joints, which are used to absorb deformation caused by temperature changes and equipment vibration.

2. The three-split capacitor support foundation structure according to claim 1, characterized in that: The self-healing reinforced concrete structure contains chemically activated components and microcapsules encapsulating the repair agent incorporated into the concrete.

3. The three-split capacitor support foundation structure according to claim 2, characterized in that: The core material of the microcapsule is an epoxy resin-based repair agent or a modified polyurethane repair agent, the shell of the microcapsule is urea-formaldehyde resin or polyurethane, and the particle size of the microcapsule is 50-300 μm.

4. The three-split capacitor support foundation structure according to claim 2, characterized in that: The chemical activating component is a silicate-based active mineral material, including one or more of metakaolin, slag powder, and fly ash.

5. The three-split capacitor support foundation structure according to claim 2, characterized in that: The chemically activated component is added at a rate of 5-12% of the mass of the concrete gel material, the microcapsule is added at a rate of 0.5-2% of the mass of the concrete, and the mass ratio of the microcapsule to the chemically activated component is 1:5 to 1:

10.

6. The three-split capacitor support foundation structure according to claim 1, characterized in that: The upper support includes a steel plate pre-embedded in the three-part column and anchor bars passing through the steel plate.

7. The three-split capacitor support foundation structure according to claim 1, characterized in that: The cross-section of the three-split column is circular or square, and it is equipped with vertical main reinforcement and circumferential distribution reinforcement inside. There is a gap between the three-split columns. The internal reinforcement of the base plate is arranged in a cross pattern. The bottom anchor bars of the three-split columns are connected to the main reinforcement of the base plate.

8. The three-split capacitor support foundation structure according to claim 1, characterized in that: The expansion joint is filled with a waterproof flexible sealant.

9. A method for constructing a three-split capacitor support foundation structure as described in any one of claims 1-8, characterized in that: Includes the following steps: S1. Install expansion joints on the base plate at the designed locations; S2. Fix the steel reinforcement frame of the three-split column to the base plate in sequence and anchor it to the steel reinforcement in the base plate. S3. Fix the steel plate and anchor bars of the upper support to the steel reinforcement frame of the three-split column; S4. Pour concrete, incorporating microcapsules containing chemically activated components and encapsulating repair agents during the pouring process.

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