A corrosion-resistant outdoor box-type substation foundation structure

Abstract

This application relates to the field of power equipment installation technology, and in particular to a corrosion-resistant outdoor prefabricated substation foundation structure, installed in a foundation pit, comprising a foundation body, a corrosion-resistant layer system, and drainage components. The foundation body is a prefabricated reinforced concrete structure with an open top and a hollow interior. The interior is reinforced with an anti-corrosion mesh of alternating galvanized steel bars and fiberglass reinforcing bars. Ventilation holes, drainage holes, and cable holes are pre-reserved on the side walls. A U-shaped channel steel substation mounting component is installed on the top, and a support platform is provided at the bottom. The corrosion-resistant layer system is a three-layer structure consisting of a base layer, an intermediate layer, and a surface layer. The area where the foundation contacts the soil is wrapped with anti-corrosion geotextile. The drainage components include drainage pipes within the drainage holes and a drainage ditch surrounding the foundation. The drainage pipes are filled with permeable concrete, and the drainage ditch contains a gravel filter layer and permeable geotextile. This application achieves comprehensive corrosion protection, functional improvement, and safe and convenient operation and maintenance, extending the foundation's service life. It is suitable for highly corrosive outdoor environments such as coastal areas and chemical industrial parks.

Description

Technical Field

[0001] This application relates to the field of power equipment installation technology, and in particular to a corrosion-resistant outdoor box-type substation foundation structure. Background Technology

[0002] As a core piece of equipment for centralized power distribution and transformation, the outdoor installation environment of prefabricated substations directly determines their operational stability. The foundation structure, serving as the load-bearing base and installation benchmark, must not only provide sufficient support strength but also withstand multiple outdoor corrosion threats. Currently, most outdoor prefabricated substation foundations are constructed using ordinary reinforced concrete cast-in-place, which, while cost-effective, has revealed numerous shortcomings in practical applications.

[0003] Firstly, there are shortcomings in the anti-corrosion design. Traditional foundations only achieve protection by coating the surface with ordinary anti-corrosion paint, without any targeted anti-corrosion optimization for the concrete body. The internal steel bars are prone to corrosion due to rainwater penetration and soil salinity, leading to foundation cracking and spalling. For transformer substation foundations with top openings, the retention of humid air inside can easily cause corrosion at the bottom of the transformer.

[0004] Secondly, the structural functionality is insufficient. Most foundations lack dedicated ventilation channels, and the heat generated at the bottom of the transformer substation and internal moisture cannot be effectively discharged, accelerating equipment aging. The drainage system is poorly designed, relying solely on the slope of the foundation surface for natural drainage, which allows water to easily seep into the foundation and surrounding soil, creating a long-term corrosive environment.

[0005] Third, the operation and maintenance costs are high. In highly corrosive environments, the service life of traditional foundations is usually less than 10 years, requiring frequent anti-corrosion repairs or foundation replacement, which significantly increases operation and maintenance investment. Utility Model Content

[0006] This utility model addresses the aforementioned problems in the existing technology by providing a corrosion-resistant outdoor box-type substation foundation structure.

[0007] The objective of this utility model is mainly achieved through the following solution: A corrosion-resistant outdoor box-type substation foundation structure, installed in a foundation pit, includes the foundation body, a corrosion-resistant layer system, and drainage components. The foundation body is a precast reinforced concrete structure with an open top and a hollow interior. It is equipped with an anti-corrosion reinforcing mesh, which is composed of alternating galvanized steel bars and glass fiber bars. The side walls of the foundation body are reserved with ventilation holes, drainage holes and cable holes. The top of the foundation body is equipped with a transformer substation installation component, and the bottom of the foundation body is equipped with a support platform. The anti-corrosion layer system includes a base anti-corrosion layer, an intermediate isolation layer, and a surface anti-corrosion layer. The base anti-corrosion layer is coated on the surface of the foundation body. The intermediate isolation layer covers the outside of the base anti-corrosion layer. The surface anti-corrosion layer is coated on the outside of the intermediate isolation layer. Furthermore, anti-corrosion geotextile is wrapped around the surface anti-corrosion layer at the contact point between the foundation body and the soil. The drainage components include drainage holes reserved in the foundation body and surrounding drainage blind ditches. Drainage pipes are installed in the drainage holes and filled with permeable concrete. The outer end of the drainage pipes is connected to the surrounding drainage blind ditches. The drainage blind ditches are arranged around the foundation body and are lined with a crushed stone filter layer and permeable geotextile.

[0008] Preferably, the galvanized steel bar is coated with an epoxy coal tar coating, and the glass fiber bar is wrapped with basalt fiber cloth at the interface with the concrete.

[0009] Preferably, the exhaust vent is located above ground, while the drainage vent and cable hole are both located below ground; a louver is installed on the outside of the exhaust vent, with the louver blades tilted downwards; and a cable conduit is installed inside the cable hole.

[0010] Preferably, the transformer substation mounting component is a U-shaped channel steel with the opening facing downwards, and there are four transformer substation mounting components, which are respectively installed around the upper surface of the foundation body. The base of the transformer substation is connected to the transformer substation mounting component, and an elastic sealing gasket is filled between the base of the transformer substation and the upper surface of the foundation body.

[0011] Preferably, the transformer substation mounting component is connected to a grounding wire, the bottom end of which is connected to a grounding stake, and the connection between the grounding wire and the grounding stake is coated with an epoxy coal tar coating.

[0012] Preferably, the support platform includes a concrete base poured into the foundation pit, and the support platform is fixedly connected to the foundation body.

[0013] Preferably, the base platform is equipped with operating staircases on all four sides of the ground.

[0014] Preferably, the concrete of the foundation body is marine anti-corrosion concrete.

[0015] Preferably, the anti-corrosion geotextile is a spunbond needle-punched nonwoven geotextile.

[0016] In summary, compared with the prior art, the present invention has the following beneficial technical effects: (1) This utility model provides all-round corrosion protection and significantly extends the service life. It adopts a corrosion protection system consisting of concrete body corrosion protection, reinforcing bar corrosion protection, multi-layer coating corrosion protection, and local geotextile wrapping. The marine anti-corrosion concrete, combined with special admixtures, improves the corrosion resistance of the matrix from the source. The reinforcing mesh composed of galvanized steel bars and glass fiber bars avoids the rust problem of traditional single steel bars. Basalt fiber cloth further isolates the corrosive medium. The three-layer anti-corrosion coating forms a dense protective barrier. The polyurea surface layer can resist various chemical corrosions and ultraviolet aging. The anti-corrosion geotextile at the soil contact part effectively blocks soil salt and alkali erosion, extending the service life of the foundation to more than 20 years. (2) The structure of this utility model is reasonable and its functionality is greatly improved. The hollow structure with the top opening, combined with the exhaust hole and the louver with the inclined blades, realizes the air circulation between the bottom of the transformer and the inside of the foundation, effectively dissipating the heat of the equipment at the bottom and the moisture inside the foundation, and avoiding equipment corrosion caused by moisture. The drainage component forms a complete drainage path with the drainage pipe and the surrounding drainage blind ditch. The permeable concrete accelerates the discharge of internal water accumulation, ensuring that rainwater is quickly drained, fundamentally solving the problem of water accumulation and corrosion. The combination of U-shaped channel steel installation parts and elastic sealing gaskets simplifies the installation process of the transformer and achieves good sealing, preventing rainwater from seeping into the foundation. (3) This utility model has excellent safety performance and convenient operation and maintenance. The design of the grounding wire and grounding stake and the enhanced anti-corrosion treatment ensure the long-term stability of the grounding system and avoid safety accidents caused by poor grounding. The setting of the operating stair platform provides convenient operating space for operation and maintenance personnel. The prefabricated foundation body reduces the amount of on-site construction work, improves installation efficiency, and only requires periodic inspection of the anti-corrosion coating and drainage components for later maintenance, thus reducing operation and maintenance costs. Attached Figure Description

[0017] Figure 1 This is the front view of this utility model; Figure 2 This is a side view of the present invention; Figure 3 This is a top view of the present invention.

[0018] Attached reference numerals: 1-Foundation body; 2-Anti-corrosion reinforcing mesh; 3-Exhaust vent; 4-Drainage vent; 5-Cable vent; 6-Substation installation parts; 7-Supporting platform; 8-Surrounding drainage ditch; 9-Drainage pipe; 10-Louvre; 11-Cable conduit; 12-Substation; 13-Grounding wire; 14-Grounding stake; 15-Operating staircase. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0020] like Figure 1-3 As shown, this utility model discloses a technical solution: a corrosion-resistant outdoor box-type substation foundation structure, installed in a foundation pit, including a foundation body 1, a corrosion-resistant layer system, and drainage components. The foundation body 1 is a rectangular precast reinforced concrete structure with an open top and a hollow interior. It is equipped with an anti-corrosion reinforcing mesh 2, which is composed of alternating galvanized steel bars and glass fiber bars. The side walls of the foundation body 1 are reserved with ventilation holes 3, drainage holes 4 and cable holes 5. The top of the foundation body 1 is equipped with a transformer substation installation component 6, and the bottom of the foundation body 1 is equipped with a support platform 7. The anti-corrosion layer system includes a base anti-corrosion layer, an intermediate isolation layer and a surface anti-corrosion layer. The base anti-corrosion layer is coated on the surface of the foundation body 1, the intermediate isolation layer covers the outside of the base anti-corrosion layer, the surface anti-corrosion layer is coated on the outside of the intermediate isolation layer, and anti-corrosion geotextile is wrapped around the surface anti-corrosion layer at the contact point between the foundation body 1 and the soil. The drainage components include drainage holes 4 reserved in the foundation body 1 and surrounding drainage blind ditches 8. Drainage pipes 9 are installed in the drainage holes 4 and filled with permeable concrete. The outer end of the drainage pipes 9 is connected to the surrounding drainage blind ditches 8. The drainage blind ditches are set around the foundation body 1 and are lined with a crushed stone filter layer and permeable geotextile.

[0021] Specifically, the galvanized steel bar surface is coated with an epoxy coal tar coating with a thickness of 0.15-0.25mm. The glass fiber bar is wrapped with basalt fiber cloth at the contact surface with the concrete, with the wrapping width extending 5-8cm beyond the contact edge to avoid the risk of electrochemical corrosion caused by direct contact between the fiber bar and the concrete.

[0022] Specifically, the exhaust vent 3 is located 30-50cm above the ground, with two symmetrically arranged on the front and rear side walls; the drain hole 4 and cable hole 5 are both located at the bottom of the base body 1. The drain hole 4 is located on the left and right sides of the base body 1, with two on each side. The cable hole 5 is located on the left and right sides of the base body 1, with one in the middle of each side; louvers 10 are fixedly installed on the outside of the exhaust vent 3 by bolts. The blades of the louvers 10 are tilted downwards at 30-45°, which can achieve ventilation and heat dissipation while preventing rainwater from splashing in; a cable conduit 11 is installed inside the cable hole 5. The cable conduit 11 is a seamless steel pipe with an epoxy powder coating on both the inner and outer walls.

[0023] Specifically, the prefabricated substation mounting component 6 uses U-shaped channel steel with the opening facing downwards. The channel steel is of model 16-20, and there are four prefabricated substation mounting components 6, which are installed around the upper surface of the foundation body 1 and are integrally formed with the foundation body 1 during prefabrication. The base of the prefabricated substation 12 is connected to the prefabricated substation mounting component 6 by high-strength bolts, and an elastic sealing gasket with a thickness of 3-5mm is filled between the base of the prefabricated substation 12 and the upper surface of the foundation body 1. The elastic sealing gasket is made of aging-resistant EPDM rubber to achieve a sealing and waterproof effect.

[0024] Specifically, the transformer substation mounting component 6 is welded with a grounding wire 13, and the grounding wire 13 uses a cross-sectional area of ​​not less than 25mm². 2 The grounding wire 13 has a copper core conductor and is covered with an anti-corrosion sleeve. The bottom end of the grounding wire 13 is connected to a grounding stake 14. The grounding stake 14 is made of galvanized angle steel with a diameter of 50-80mm and a length of 1.5-2m, and is vertically buried in the soil 1-1.5m outside the foundation body 1. The connection between the grounding wire 13 and the grounding stake 14 is fixed with a crimp terminal, and the connection and the top 50cm of the grounding stake 14 are coated with an epoxy coal tar coating to enhance the anti-corrosion performance.

[0025] Specifically, the support platform 7 includes a concrete base poured into the foundation pit. The concrete base is made of concrete with a strength grade of C30 or above, with a thickness of 30-50cm, and a single layer of steel mesh inside. The support platform 7 is fixedly connected to the foundation body 1 by pre-embedded steel bars, which penetrate into the foundation body 1 by no less than 30cm to ensure the connection strength.

[0026] Specifically, operating stair platforms 15 are installed on all four sides of the base body 1 on the ground. The operating stair platforms 15 are made of precast reinforced concrete, with a step width of 25-30cm and a height of 15-18cm. A 1.2m high guardrail can be installed on the outside, and the guardrail is made of stainless steel to facilitate safe operation by maintenance personnel.

[0027] Specifically, the concrete for the foundation body 1 is marine anti-corrosion concrete, with a mix ratio of cement: sand: stone: water: anti-corrosion admixture = 1:1.8:2.5:0.45:0.03. The anti-corrosion admixture is composed of silica fume, fly ash and rust inhibitor mixed in a mass ratio of 3:2:1 to improve the corrosion resistance of the concrete body.

[0028] Specifically, in the anti-corrosion layer system, the base anti-corrosion layer is a penetrating epoxy resin sealing primer with a coating thickness of 0.1-0.15mm, which can penetrate deep into the concrete pores to form a sealed protection; the intermediate isolation layer is a glass flake putty coating with a thickness of 0.8-1.2mm, which has excellent anti-permeability performance; the top anti-corrosion layer is a polyurea elastomer coating with a thickness of 1.5-2.0mm, which has wear resistance, weather resistance, and chemical corrosion resistance; the anti-corrosion geotextile is a long-filament spunbond needle-punched nonwoven geotextile with a basis weight ≥400g / m². 2 Permeability coefficient ≥1×10 -3 cm / s, the wrapping height is 30cm above the ground of the base body 1.

[0029] Specifically, the drainage blind ditch has an inverted trapezoidal cross-section, with an upper width of 40-50cm, a lower width of 20-30cm, and a depth of 50-60cm. The bottom is sloped at 5-8° to ensure smooth drainage. A 10-15cm thick gravel filter layer and a permeable geotextile are laid in the ditch from bottom to top. The gravel filter layer uses granite gravel with a particle size of 20-40mm. The permeable geotextile is made of the same material as the anti-corrosion geotextile to prevent soil from clogging the drainage blind ditch.

[0030] The following details the specific construction process to further illustrate this application: 1. Foundation pit excavation and support platform construction: Excavate a foundation pit 5m long × 3m wide × 1.8m deep according to the foundation body dimensions. After leveling the bottom of the pit, lay a 10cm thick crushed stone cushion layer and compact it. Use C35 marine anti-corrosion concrete to pour the support platform 7. The mix ratio is cement:sand:stone:water:anti-corrosion admixture = 1:1.8:2.5:0.45:0.03. The anti-corrosion admixture is composed of 30kg silica fume, 20kg fly ash and 10kg rust inhibitor. The support platform is 40cm thick and is internally reinforced with φ12mm@200×200 steel mesh. After curing for 7 days, it is ready for use.

[0031] 2. Foundation Prefabrication: The foundation body 1 is prefabricated using the same marine anti-corrosion concrete as the supporting platform, with dimensions of 4.8m long × 2.8m wide × 1.5m high. The top opening size matches the transformer base. The internal anti-corrosion reinforcing mesh 2 is made of alternating φ16mm galvanized steel bars and φ14mm fiberglass bars. The galvanized steel bars are coated with a 0.2mm thick epoxy coal tar coating, and the fiberglass bars are wrapped with basalt fiber cloth. Two ventilation holes are reserved on each of the front and rear side walls, two drainage holes are reserved on each of the left and right side walls, and one cable hole is reserved on each of the left and right side walls. Four No. 18 U-shaped channel steels are prefabricated around the top as transformer installation parts 6, which are integrally formed with the foundation body. After prefabrication, it is cured for 14 days to ensure that the strength meets the standards.

[0032] 3. Construction of the anti-corrosion layer system: After grinding and cleaning the surface of the base body 1, apply a 0.12mm thick penetrating epoxy resin sealing primer as the base anti-corrosion layer; after the primer cures, apply a 1.0mm thick glass flake putty to form an intermediate isolation layer, and compact it with a trowel to avoid air bubbles; finally, spray a 1.8mm thick polyurea elastomer surface anti-corrosion layer; wrap the parts of the base body in contact with the soil with a 400g / m² layer. 2 Long-filament spunbond needle-punched geotextile, with a height of 30cm above the ground.

[0033] 4. Component Installation: The foundation body 1 is hoisted onto the support platform 7, fixed and connected by pre-embedded steel bars, and concrete is poured to fill the gaps; the epoxy-coated seamless steel pipe inside the drainage hole 4 serves as the drainage pipe 9, and the inside is filled with permeable concrete; aluminum alloy louvers 10 with blades tilted at 40° are installed on the outside of the exhaust hole 3; epoxy-coated cable conduits 11 are installed inside the cable hole 5; an inverted trapezoidal drainage ditch 8 is excavated around the outside of the foundation body, with an upper width of 45cm, a lower width of 25cm, and a depth of 55cm, and a 6° slope at the bottom, with a 12cm thick granite gravel filter layer and permeable geotextile inside, and the end of the drainage ditch is connected to the plant area drainage system; the transformer box installation component 6 is welded with a 25mm² copper core grounding wire (13), and the bottom end is connected to a φ60mm×1.8m galvanized angle steel grounding pile 14, and the connection is pressed and fixed and then coated with an epoxy coal tar coating; a precast reinforced concrete operating staircase 15 is installed on the ground around the foundation, with a step width of 28cm and a height of 16cm, and a 1.2m high stainless steel guardrail is set on the outside.

[0034] 5. Installation of the box-type substation: The 12 base of the box-type substation is connected to the box-type substation installation component 6 by M24 high-strength bolts. A 4mm thick EPDM elastic sealing gasket is filled between the base and the upper surface of the foundation body to complete the installation.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A corrosion-proof outdoor box-type substation foundation structure installed in a foundation pit, characterized in that: Includes the basic body (1), the anti-corrosion layer system, and the drainage components; The foundation body (1) is a precast reinforced concrete structure with an open top and a hollow interior. It is equipped with an anti-corrosion reinforcing mesh (2) inside. The anti-corrosion reinforcing mesh (2) is composed of alternating galvanized steel bars and glass fiber bars. The side wall of the foundation body (1) is reserved with ventilation holes (3), drainage holes (4) and cable holes (5). The top of the foundation body (1) is equipped with a transformer substation installation component (6), and the bottom of the foundation body (1) is equipped with a support platform (7). The anti-corrosion layer system includes a base anti-corrosion layer, an intermediate isolation layer and a surface anti-corrosion layer. The base anti-corrosion layer is coated on the surface of the base body (1). The intermediate isolation layer covers the outside of the base anti-corrosion layer. The surface anti-corrosion layer is coated on the outside of the intermediate isolation layer. Anti-corrosion geotextile is wrapped around the surface anti-corrosion layer at the contact point between the base body (1) and the soil. The drainage component includes a drainage hole (4) reserved in the foundation body (1) and a surrounding drainage blind ditch (8). A drainage pipe (9) is installed in the drainage hole (4). The drainage pipe (9) is filled with permeable concrete. The outer end of the drainage pipe (9) is connected to the surrounding drainage blind ditch (8). The drainage blind ditch is set around the foundation body (1), and a crushed stone filter layer and permeable geotextile are laid in the drainage blind ditch.

2. A corrosion-proof outdoor box-type substation foundation structure according to claim 1, characterized in that: The galvanized steel bar is coated with an epoxy coal tar coating, and the glass fiber bar is wrapped with basalt fiber cloth at the interface with the concrete.

3. The anti-corrosion outdoor box-type substation foundation structure according to claim 1, characterized in that: The exhaust vent (3) is located above ground, while the drain vent (4) and cable vent (5) are both located below ground. A louver (10) is installed on the outside of the exhaust vent (3), and the blades of the louver (10) are tilted downwards. A cable conduit (11) is installed inside the cable vent (5).

4. The anti-corrosion outdoor box-type substation foundation structure according to claim 1, characterized in that: The transformer substation mounting component (6) is made of U-shaped channel steel with the opening facing downwards, and there are four transformer substation mounting components (6), which are installed around the upper surface of the foundation body (1). The base of the transformer substation (12) is connected to the transformer substation mounting component (6), and an elastic sealing gasket is filled between the base of the transformer substation (12) and the upper surface of the foundation body (1).

5. The anti-corrosion outdoor box-type substation foundation structure according to claim 1, characterized in that: The transformer substation installation component (6) is connected to a grounding wire (13), and the bottom end of the grounding wire (13) is connected to a grounding stake (14). The connection between the grounding wire (13) and the grounding stake (14) is coated with an epoxy coal tar coating.

6. The anti-corrosion outdoor box-type substation foundation structure according to claim 1, characterized in that: The support platform (7) includes a concrete base poured into the foundation pit, and the support platform (7) is fixedly connected to the foundation body (1).

7. The anti-corrosion outdoor box-type substation foundation structure according to claim 1, characterized in that: The basic platform is equipped with operating staircases (15) on all four sides of the ground.

8. The anti-corrosion outdoor box-type substation foundation structure according to claim 1, characterized in that: The concrete of the foundation body (1) is marine anti-corrosion concrete.

9. The anti-corrosion outdoor box-type substation foundation structure according to claim 1, characterized in that: The anti-corrosion geotextile is made of spunbond needle-punched nonwoven geotextile.

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