Corrosion-proof tower leg structure of power transmission angle steel tower

Abstract

The utility model belongs to the technical field of power transmission angle steel tower, disclose a power transmission angle steel tower anticorrosive tower foot structure, including tower foot main part, composite anticorrosive layer, protective sleeve, flow guide drainage component, corrosion monitoring module and base fixed assembly, the tower foot main part is angle steel welded structure, bottom rigid connection with base fixed assembly, adopt "epoxy primer - zinc aluminum coating - glass flake - polyurea finish " four layer composite structure, zinc aluminum coating provides the sacrifice anode protection, glass flake mortar layer blocks the corrosion medium penetration, polyurea finish layer resists mechanical damage, and the anticorrosive life is prolonged, and the traditional structure is improved, the stainless steel inner tube of protective sleeve and glass steel outer tube form physical barrier, and the direct contact of external force impact and soil is isolated, the rubber sealing ring of top and bottom flange plate sealing structure prevent rain, sand into the sleeve interior, strengthen anticorrosive sleeve to the tower foot main part node weak position intensification protection, solve the traditional structure node easy rust problem.

Description

Technical Field

[0001] This utility model relates to the field of power transmission angle steel tower technology, and in particular to the anti-corrosion tower foot structure of power transmission angle steel tower. Background Technology

[0002] As a core supporting facility for power transmission networks, the base structure of transmission angle steel towers directly determines the overall stability and service life of the tower. The tower bases are constantly exposed to damp underground or surface environments, facing multiple forms of damage including soil corrosion, electrochemical corrosion, biological corrosion, and mechanical damage. Salt, moisture, and microorganisms in the soil form a corrosive medium, resulting in an annual corrosion rate of 0.1-0.3 mm for the steel at the tower base. Ordinary anti-corrosion coatings will peel off and fail within 3-5 years. Contact between different metal components forms electrochemical corrosion cells, accelerating the corrosion of the tower base nodes. Ground subsidence, vehicle rolling, or external impacts can easily damage the anti-corrosion layer at the tower base, leading to the spread of corrosion. Fourth, traditional anti-corrosion structures are difficult to inspect, and corrosion defects can only be detected after excavation, resulting in high maintenance costs and affecting the reliability of power supply. Therefore, we proposed an anti-corrosion tower base structure for transmission angle steel towers. Utility Model Content

[0003] The purpose of this utility model is to provide an anti-corrosion tower foot structure for power transmission angle steel towers, which solves the existing problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A corrosion-resistant tower foot structure for a power transmission angle steel tower includes a tower foot body, a composite anti-corrosion layer, a protective sleeve, a drainage component, a corrosion monitoring module, and a foundation fixing component. The tower foot body is a welded angle steel structure, rigidly connected to the foundation fixing component at the bottom, and the composite anti-corrosion layer covers the outer surface of the tower foot body. The protective sleeve is fitted onto the outside of the tower foot body and is sealed to the surface concrete cushion layer. The drainage component is symmetrically arranged on both sides of the bottom of the protective sleeve. The corrosion monitoring module is embedded inside the composite anti-corrosion layer and electrically connected to a wireless transmission terminal at the top of the tower.

[0005] Preferably, the composite anti-corrosion layer consists of an epoxy primer layer, a zinc-aluminum coating layer, a glass flake putty layer, and a polyurea topcoat layer from the inside out; the epoxy primer layer is 80 μm thick, the zinc-aluminum coating layer is applied using a thermal spraying process, the glass flake putty layer is 300 μm thick, and the polyurea topcoat layer is 120 μm thick.

[0006] Preferably, the protective sleeve includes a stainless steel inner cylinder and a fiberglass outer cylinder. The stainless steel inner cylinder is 5mm thick and has axial reinforcing ribs on its inner wall. The fiberglass outer cylinder is 12mm thick and is made of glass fiber reinforced epoxy resin. The top of the protective sleeve is provided with a rubber sealing ring and the bottom is provided with a flange. It is fixed to the concrete pad by expansion bolts and sealed with sealant.

[0007] Preferably, the drainage component includes a water collection tank, a guide pipe, and a filter screen; the water collection tank has an arc-shaped structure and is welded to the inner wall of the bottom of the protective sleeve; the guide pipe is made of UPVC material, with one end connected to the water collection tank and the other end extending to the surface drainage system; the filter screen is made of stainless steel and is installed at the water inlet of the water collection tank.

[0008] Preferably, the corrosion monitoring module includes a humidity sensor, a corrosion rate sensor, and a potential monitoring probe; the corrosion rate sensor is a resistance probe type and is evenly arranged along the height direction of the tower base.

[0009] Preferably, the foundation fixing component includes a pre-embedded anchor bolt, an anti-corrosion gasket, and a fastening nut; the pre-embedded anchor bolt is made of weathering steel, the anti-corrosion gasket is made of polytetrafluoroethylene and coated with a silane coupling agent; the fastening nut is covered with a polyethylene anti-corrosion cap and filled with anaerobic sealant.

[0010] Preferably, the outer side of the protective sleeve is provided with an inspection port, which is sealed with a flange cover plate, and the inner side of the cover plate is provided with a nitrile rubber sealing gasket; this facilitates the maintenance of the corrosion monitoring module and the repair of the composite anti-corrosion layer.

[0011] Preferably, the angle steel joints of the tower foot body are provided with reinforced anti-corrosion sleeves, which are made of seamless stainless steel pipes, with the inner wall attached to the composite anti-corrosion layer, and both ends are fixed to the tower foot body by welding; the thickness of the reinforced anti-corrosion sleeve is 5mm.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The anti-corrosion tower foot structure of the power transmission angle steel tower of this utility model adopts a four-layer composite structure of "epoxy primer-zinc-aluminum coating-glass flake-polyurea topcoat". The zinc-aluminum coating provides sacrificial anode protection, the glass flake putty layer blocks the penetration of corrosive media, and the polyurea topcoat layer resists mechanical damage, thus extending the anti-corrosion service life and improving the traditional structure. The stainless steel inner cylinder and the fiberglass outer cylinder of the protective sleeve form a physical barrier to isolate external impact and direct contact with the soil. The top rubber sealing ring and the bottom flange sealing structure prevent rainwater and mud from entering the sleeve. The reinforced anti-corrosion sleeve strengthens the protection of the weak parts of the main nodes of the tower foot, solving the problem of easy corrosion of nodes in the traditional structure. (2) The anti-corrosion tower foot structure of the power transmission angle steel tower of this utility model has a drainage component that collects condensate and rainwater seeping into the protective sleeve through a water collection tank and quickly discharges it into the surface drainage system through a diversion pipe, so that the relative humidity inside the sleeve is controlled below %. The slope design and the filter screen are combined to avoid siltation and blockage, thereby reducing the risk of corrosion of the tower foot body caused by the humid environment from the source. The humidity sensor, corrosion rate sensor and potential monitoring probe of the corrosion monitoring module collect data in real time and upload it to the operation and maintenance platform through a wireless transmission terminal. The integrity of the composite anti-corrosion layer and the corrosion status of the tower foot body can be monitored remotely. Abnormal data will be automatically alarmed, and corrosion defects can be located without excavation, thus shortening the maintenance response time and reducing the operation and maintenance cost. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the present invention; Figure 3 This is a partial three-dimensional structural diagram of the composite anti-corrosion layer in this utility model; Figure 4 This is a partial three-dimensional structural diagram of the wireless transmission terminal in this utility model.

[0015] Figure 5 This is a partial three-dimensional structural diagram of the concrete foundation in this utility model.

[0016] In the diagram: 1. Tower base body; 101. Reinforced anti-corrosion sleeve; 2. Composite anti-corrosion layer; 201. Epoxy primer layer; 202. Zinc-aluminum coating; 203. Glass flake putty layer; 204. Polyurea topcoat layer; 3. Protective sleeve; 301. Stainless steel inner cylinder; 302. Fiberglass outer cylinder; 303. Axial reinforcing rib; 304. Rubber sealing ring; 305. Flange; 306. Expansion bolt; 307. Sealant; 308. Inspection port; 309. Flange cover plate; 310. Nitrile butadiene rubber. 4. Rubber sealing gasket; 5. Drainage and diversion assembly; 6. Water collection tank; 7. Drainage pipe; 8. Filter screen; 9. Corrosion monitoring module; 10. Humidity sensor; 20. Corrosion rate sensor; 11. Potential monitoring probe; 20. Foundation fixing assembly; 12. Embedded anchor bolt; 13. Anti-corrosion gasket; 24. Fastening nut; 35. Polyethylene anti-corrosion cap; 46. Anaerobic sealant; 57. Concrete pad; 68. Wireless transmission terminal; 9. Surface drainage system. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0018] refer to Figure 1-5A corrosion-resistant tower foot structure for a power transmission angle steel tower includes a tower foot body 1, a composite anti-corrosion layer 2, a protective sleeve 3, a drainage and diversion assembly 4, a corrosion monitoring module 5, and a foundation fixing assembly 6. The tower foot body 1 is a welded angle steel structure, rigidly connected to the foundation fixing assembly 6 at its bottom. The composite anti-corrosion layer 2 covers the outer surface of the tower foot body 1. The protective sleeve 3 is fitted onto the outside of the tower foot body 1 and is sealed to the ground concrete pad 7. The drainage and diversion assembly 4 is symmetrically arranged on both sides of the bottom of the protective sleeve 3. The corrosion monitoring module 5 is embedded inside the composite anti-corrosion layer 2 and electrically connected to a wireless transmission terminal 8 at the top of the tower. A four-layer composite structure of "epoxy primer - zinc-aluminum coating - glass flake - polyurea topcoat" is adopted. The zinc-aluminum coating 202 provides sacrificial anode protection, the glass flake putty layer 203 blocks the penetration of corrosive media, and the polyurea topcoat layer 204 resists mechanical damage. The four layers work together to protect the tower foot body. The corrosion rate of body 1 is reduced to below 0.01 mm / a, and the anti-corrosion service life is extended to more than 15 years, which is an improvement over the traditional structure. The stainless steel inner cylinder 301 and the fiberglass outer cylinder 302 of the protective sleeve 3 form a physical barrier to isolate external impact and direct contact with soil. The top rubber sealing ring 304 and the bottom flange 305 seal the structure to prevent rainwater and mud from entering the sleeve. The reinforced anti-corrosion sleeve 101 strengthens the protection of weak parts of the tower foot body 1 nodes, solving the problem of easy corrosion of nodes in traditional structures. In this embodiment, the composite anti-corrosion layer 2 consists of an epoxy primer layer 201, a zinc-aluminum coating 202, a glass flake putty layer 203, and a polyurea topcoat layer 204 from the inside to the outside. The epoxy primer layer 201 is 80 μm thick, the zinc-aluminum coating 202 is applied by thermal spraying, the glass flake putty layer 203 is 300 μm thick, and the polyurea topcoat layer 204 is 120 μm thick.

[0019] In this embodiment, the protective sleeve 3 includes a stainless steel inner cylinder 301 and a fiberglass outer cylinder 302. The stainless steel inner cylinder 301 is 5mm thick and has axial reinforcing ribs 303 on its inner wall. The fiberglass outer cylinder 302 is 12mm thick and is made of glass fiber reinforced epoxy resin. The protective sleeve 3 has a rubber sealing ring 304 at the top and a flange 305 at the bottom. It is fixed to the concrete pad 7 by expansion bolts 306 and sealed with sealant 307. The drainage component 4 collects condensate and rainwater seepage inside the protective sleeve 3 through a water collection tank 401 and quickly discharges it into the surface drainage system 9 through a diversion pipe 402, keeping the relative humidity inside the sleeve below 60%. The slope design, combined with the filter screen 403, prevents siltation and blockage, reducing corrosion of the tower base 1 caused by a humid environment from the source. Corrosion risk; the humidity sensor 501, corrosion rate sensor 502 and potential monitoring probe 503 of the corrosion monitoring module 5 collect data in real time and upload it to the operation and maintenance platform through the wireless transmission terminal 8, which can remotely monitor the integrity of the composite anti-corrosion layer 2 and the corrosion status of the tower foot body 1; abnormal data will automatically alarm, and corrosion defects can be located without excavation, shortening the maintenance response time and reducing operation and maintenance costs; in this embodiment, the diversion and drainage component 4 includes a water collection tank 401, a diversion pipe 402 and a filter screen 403; the water collection tank 401 has an arc-shaped structure and is welded to the bottom inner wall of the protective sleeve 3; the diversion pipe 402 is made of UPVC material, one end of which is connected to the water collection tank 401 and the other end extends to the surface drainage system 9; the filter screen 403 is made of stainless steel and is installed at the water inlet of the water collection tank 401.

[0020] In this embodiment, the corrosion monitoring module 5 includes a humidity sensor 501, a corrosion rate sensor 502, and a potential monitoring probe 503; the corrosion rate sensor 502 is a resistance probe type, and is evenly arranged along the height direction of the tower foot body 1; in this embodiment, the foundation fixing component 6 includes a pre-embedded anchor bolt 601, an anti-corrosion gasket 602, and a fastening nut 603; the pre-embedded anchor bolt 601 is made of weathering steel, the anti-corrosion gasket 602 is made of polytetrafluoroethylene, and the surface is coated with a silane coupling agent; the fastening nut 603 is covered with a polyethylene anti-corrosion cap 604 on the outside and filled with anaerobic sealant 605 inside.

[0021] In this embodiment, the outer side of the protective sleeve 3 is provided with an inspection port 308, which is sealed by a flange cover plate 309. A nitrile rubber sealing gasket 310 is provided on the inner side of the cover plate. This facilitates the maintenance of the corrosion monitoring module 5 and the repair of the composite anti-corrosion layer 2. The fiberglass outer cylinder 302 of the protective sleeve 3 has a bending strength ≥300MPa, which can withstand vehicle crushing and external impacts. The polyurea topcoat layer 204 of the composite anti-corrosion layer 2 has an impact strength ≥50kg·cm, preventing damage to the anti-corrosion layer during construction or maintenance. The overall structure is adaptable to various highly corrosive environments such as saline-alkali land, wetlands, and coastal areas, exhibiting strong versatility. The composite anti-corrosion layer 2 adopts mature spraying and brushing technology, which is compatible with the existing tower foot body 1 processing flow; the protective sleeve 3 is quickly fixed by flange 305 and expansion bolt 306 without the need to modify the original concrete foundation structure; it is suitable for the installation of new angle steel towers and the anti-corrosion renovation of old tower feet, and has a wide range of applications; in this embodiment, a reinforced anti-corrosion sleeve 101 is provided at the angle steel node of the tower foot body 1. The reinforced anti-corrosion sleeve 101 is made of seamless stainless steel pipe, the inner wall is attached to the composite anti-corrosion layer 2, and the two ends are fixed to the tower foot body 1 by welding; the thickness of the reinforced anti-corrosion sleeve 101 is 5mm.

[0022] Specifically, a four-layer composite structure of "epoxy primer - zinc-aluminum coating - glass flake - polyurea topcoat" is adopted. The zinc-aluminum coating 202 provides sacrificial anode protection, the glass flake putty layer 203 blocks the penetration of corrosive media, and the polyurea topcoat layer 204 resists mechanical damage. The four layers work together to reduce the corrosion rate of the tower foot body 1 to below 0.01 mm / a and extend the anti-corrosion service life to more than 15 years, which is an improvement over the traditional structure. The stainless steel inner cylinder 301 and the fiberglass outer cylinder 302 of the protective sleeve 3 form a physical barrier to isolate external impact and direct contact with soil. The top rubber sealing ring 304 and the bottom flange 305 sealing structure prevent rainwater and mud from entering the sleeve. The reinforced anti-corrosion sleeve 101 strengthens the protection of weak parts of the tower foot body 1 nodes, solving the problem of easy corrosion of nodes in the traditional structure.

[0023] The drainage component 4 collects condensate and rainwater seepage inside the protective sleeve 3 through the water collection tank 401, and quickly discharges it into the surface drainage system 9 through the diversion pipe 402, keeping the relative humidity inside the sleeve below 60%. The slope design, in conjunction with the filter screen 403, prevents siltation and blockage, reducing the risk of corrosion of the tower base 1 caused by the humid environment from the source. The humidity sensor 501, corrosion rate sensor 502, and potential monitoring probe 503 of the corrosion monitoring module 5 collect data in real time and upload it to the operation and maintenance platform through the wireless transmission terminal 8, which can remotely monitor the integrity of the composite anti-corrosion layer 2 and the corrosion status of the tower base 1. Abnormal data will automatically trigger an alarm, and corrosion defects can be located without excavation, shortening the maintenance response time and reducing operation and maintenance costs.

[0024] The pre-embedded anchor bolts 601 of the foundation fixing component 6 are embedded in the concrete foundation to a depth of ≥800mm. Together with the anti-corrosion gaskets 602 and anaerobic sealant 605, they ensure a rigid connection between the tower foot body 1 and the foundation, while also preventing electrochemical corrosion between the pre-embedded anchor bolts 601 and the tower foot body 1. The polyethylene anti-corrosion caps 604 further protect the fastening nuts 603, preventing rainwater from entering the threaded parts. The inspection port 308 of the protective sleeve 3 allows maintenance personnel to open the flange cover 309 without excavation to calibrate or replace the corrosion monitoring module 5 and repair any local damage to the composite anti-corrosion layer 2. After maintenance, the sealant 307 and nitrile rubber sealing gasket 310 are used for quick sealing, reducing the maintenance time to within 2 hours and avoiding the impact of prolonged power outages.

[0025] The fiberglass outer cylinder 302 of the protective sleeve 3 has a bending strength ≥300MPa, which can withstand vehicle crushing and external impact; the polyurea topcoat layer 204 of the composite anti-corrosion layer 2 has an impact strength ≥50kg·cm, avoiding damage to the anti-corrosion layer during construction or operation and maintenance; the overall structure is suitable for various highly corrosive environments such as saline-alkali land, wetlands, and coastal areas, and has strong versatility; the composite anti-corrosion layer 2 adopts mature spraying and brushing technology, which is compatible with the existing tower foot body 1 processing flow; the protective sleeve 3 is quickly fixed by flange 305 and expansion bolts 306, without the need to modify the original concrete foundation structure; it is suitable for the installation of new angle steel towers and the anti-corrosion renovation of old tower feet, with a wide range of applications.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The corrosion-resistant tower foot structure for power transmission angle steel towers provided by this utility model has been described in detail above. Specific embodiments have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A corrosion-resistant tower foot structure for a power transmission angle steel tower, characterized in that, include: The tower foot body (1), composite anti-corrosion layer (2), protective sleeve (3), drainage component (4), corrosion monitoring module (5) and foundation fixing component (6); the tower foot body (1) is a welded angle steel structure, and its bottom is rigidly connected to the foundation fixing component (6). The composite anti-corrosion layer (2) covers the outer surface of the tower foot body (1). The protective sleeve (3) is fitted on the outside of the tower foot body (1) and is sealed to the ground concrete pad layer (7). The drainage component (4) is symmetrically arranged on both sides of the bottom of the protective sleeve (3). The corrosion monitoring module (5) is embedded inside the composite anti-corrosion layer (2) and is electrically connected to the wireless transmission terminal (8) at the top of the tower.

2. The anti-corrosion tower foot structure of the power transmission angle steel tower according to claim 1, characterized in that, The composite anti-corrosion layer (2) consists of an epoxy primer layer (201), a zinc-aluminum coating layer (202), a glass flake putty layer (203), and a polyurea topcoat layer (204) from the inside out. The epoxy primer layer (201) has a thickness of 80 μm, the zinc-aluminum coating layer (202) is applied by thermal spraying, the glass flake putty layer (203) has a thickness of 300 μm, and the polyurea topcoat layer (204) has a thickness of 120 μm.

3. The anti-corrosion tower foot structure of the power transmission angle steel tower according to claim 1, characterized in that, The protective sleeve (3) includes a stainless steel inner cylinder (301) and a fiberglass outer cylinder (302). The stainless steel inner cylinder (301) is 5mm thick and has axial reinforcing ribs (303) on its inner wall. The fiberglass outer cylinder (302) is 12mm thick and is made of glass fiber reinforced epoxy resin. The top of the protective sleeve (3) is provided with a rubber sealing ring (304) and the bottom is provided with a flange (305). It is fixed to the concrete pad (7) by expansion bolts (306) and sealed with sealant (307).

4. The anti-corrosion tower foot structure of the power transmission angle steel tower according to claim 1, characterized in that, The drainage component (4) includes a water collection tank (401), a guide pipe (402), and a filter screen (403). The water collection tank (401) has an arc-shaped structure and is welded to the bottom inner wall of the protective sleeve (3). The guide pipe (402) is made of UPVC material, with one end connected to the water collection tank (401) and the other end extending to the surface drainage system (9). The filter screen (403) is made of stainless steel and is installed at the inlet of the water collection tank (401).

5. The anti-corrosion tower foot structure of the power transmission angle steel tower according to claim 1, characterized in that, The corrosion monitoring module (5) includes a humidity sensor (501), a corrosion rate sensor (502), and a potential monitoring probe (503); the corrosion rate sensor (502) is a resistance probe type and is evenly arranged along the height direction of the tower foot body (1).

6. The anti-corrosion tower foot structure of the power transmission angle steel tower according to claim 1, characterized in that, The basic fixing component (6) includes a pre-embedded anchor bolt (601), an anti-corrosion gasket (602), and a fastening nut (603); the pre-embedded anchor bolt (601) is made of weathering steel, the anti-corrosion gasket (602) is made of polytetrafluoroethylene and coated with silane coupling agent; the fastening nut (603) is covered with a polyethylene anti-corrosion cap (604) on the outside and filled with anaerobic sealant (605) inside.

7. The anti-corrosion tower foot structure of the power transmission angle steel tower according to claim 1, characterized in that, The protective sleeve (3) has an inspection port (308) on the outside. The inspection port (308) is sealed with a flange cover plate (309). The inner side of the cover plate is provided with a nitrile rubber sealing gasket (310). This facilitates the maintenance of the corrosion monitoring module (5) and the repair of the composite anti-corrosion layer (2).

8. The anti-corrosion tower foot structure of the power transmission angle steel tower according to claim 1, characterized in that, The angle steel joint of the main body of the tower foot (1) is provided with a reinforced anti-corrosion sleeve (101). The reinforced anti-corrosion sleeve (101) is made of seamless stainless steel pipe. The inner wall is attached to the composite anti-corrosion layer (2). The two ends are fixed to the main body of the tower foot (1) by welding. The thickness of the reinforced anti-corrosion sleeve (101) is 5mm.

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