CN110565677B - Anticorrosion treatment method for contact part between power transmission iron tower and foundation - Google Patents
Anticorrosion treatment method for contact part between power transmission iron tower and foundation Download PDFInfo
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- CN110565677B CN110565677B CN201910835280.0A CN201910835280A CN110565677B CN 110565677 B CN110565677 B CN 110565677B CN 201910835280 A CN201910835280 A CN 201910835280A CN 110565677 B CN110565677 B CN 110565677B
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
Abstract
The invention provides an anti-corrosion treatment method for a contact part between a power transmission iron tower and a foundation. The treatment method is used for treating corrosion of a connecting part of a power transmission iron tower and a foundation when the power transmission iron tower and the foundation are connected in a main angle steel insertion mode or a foundation bolt connection mode, grooving or non-grooving is selected according to the connecting mode and the corrosion condition, oil dirt on the metal surface of the contact part of the power transmission iron tower and the foundation is treated, rust removal and old paint film taking out are carried out on the corrosion area of the connecting part, then fresh antirust paint is coated, a butyl rubber layer is sleeved with a mold, and airtight concrete is poured until the airtight concrete is stable. The method provided by the invention ensures the corrosion resistance of the contact part of the iron tower and the foundation to a higher degree, improves the safety and stability of the line, reduces accidents caused by serious corrosion of the iron tower, effectively solves the problems that the contact part of the power transmission iron tower and the foundation is easy to corrode and has poor corrosion resistance effect, and saves the maintenance cost in the future.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention of power transmission equipment, and particularly relates to a corrosion prevention treatment method for a contact part of a power transmission iron tower and a foundation.
Background
The transmission tower is a direct support of a power grid transmission line, bears the self weight of a lead and wind load, and is a basic guarantee for safe operation of a line. Especially, the breadth of our country is broad, the network of the transmission line is complex, and the transmission line is widely distributed all over the country as the life pulse of the national economic development. The power transmission tower is extremely susceptible to corrosion due to year-round exposure in a natural environment, corrosion damage is an important failure mode of the tower, tower feet of the power transmission tower are connected with the power transmission tower and a foundation, the tower feet are important supporting parts of the power transmission tower, working stress is also at a high level in service, once corrosion occurs, the safety of the power transmission tower is seriously threatened, and the risk of tower collapse exists.
Typically, the critical humidity at which corrosion of the metal article occurs is 75%, and corrosion will only occur if this humidity is reached or exceeded. When the relative humidity of the environment is lower than 35%, rust is not easy to generate, and once the relative humidity exceeds 80%, corrosion is obviously accelerated. Since the transmission line is placed in an outdoor environment and is difficult to avoid contact with oxygen and water vapor in the air, corrosion often occurs. The most easily caused corrosion of the iron tower mainly comprises air corrosion and corrosion of pollutants. The adoption of coatings on metal surfaces to prevent corrosion is a well-established economic and effective way, and with the continuous development of industry, the anticorrosion technology is continuously improved, and the formula of the anticorrosion coatings is continuously updated. The coatings used in the past often have unstable properties, are not long lasting, and have thick coatings that crack or fall off after exposure to sunlight for a period of time. Once the coating falls off, the protective effect on metal is lost, and the iron tower exposed to the air can be easily corroded by the air and pollutants.
At present, the anticorrosion measure for the power transmission tower is to adopt hot-dip galvanizing anticorrosion, and according to the difference of corrosion environments of various regions, anticorrosion maintenance is often required to be carried out on the power transmission tower every 5-10 years, and zinc-rich paint and the like are mostly adopted for the anticorrosion maintenance. The epoxy zinc-rich paint is a special paint which is composed of epoxy resin and zinc powder as main raw materials, a thickening agent, a filler, an auxiliary agent, a solvent and the like, and is mainly used for steel pipes, storage tanks, steel structures, containers and the like. Excellent corrosion resistance, strong adhesion, high zinc powder content in a paint film, cathode protection effect and excellent water resistance. However, practice shows that the anticorrosion effect is not obvious only by using the zinc-rich coating in the operation process, as the transmission tower is in a natural environment, the change of weather, such as rain, snow, strong wind, high temperature and other weather conditions, can cause dust, salt and other impurities in the natural environment to be attached to the surface of the transmission tower, the corrosion of the transmission tower can be accelerated by the impurities, and the binding force of the coating and a tower base body can be reduced when the coating is brushed, so that the anticorrosion effect of the coating on the transmission tower is reduced, the tower foot is still continuously corroded after a period of time, and especially in a heavily polluted area and a tower foot buried area, part of tower foot parts are always subjected to penetrating corrosion, thereby bringing direct threat to the transmission tower.
In addition, when the iron tower is subjected to anti-corrosion treatment, theoretical knowledge is combined and subjective judgment is matched to obtain the corrosion degree of the contact part of the iron tower and a foundation, the corrosion degree of each iron tower is uneven according to different environments and other irresistible forces, a small part of the iron tower is severely corroded, the iron tower and a protective umbrella used for transmitting electric energy of the iron tower are potential safety hazards, and the iron tower needs to be fixed firstly by taking measures to avoid accidents and then is further treated by taking corresponding measures. For light corrosion and moderate corrosion, a reasonable evaluation and treatment scheme can save a large amount of manpower and material resources on the premise of ensuring the corrosion prevention effect of the iron tower, and environment-friendly materials are selected and can correspondingly protect the surrounding environment.
Disclosure of Invention
In order to solve the problems existing in the prior art, the invention provides an anticorrosion method for a contact part of a power transmission iron tower and a foundation, which can radically solve the corrosion problem, ensure the stability of the contact part of the iron tower and the foundation to a higher degree, improve the safety and stability of a line and reduce accidents caused by serious corrosion of the iron tower.
In order to achieve the aim, the invention provides an anti-corrosion treatment method for a contact part between a power transmission iron tower and a foundation, which is used for treating the corrosion of the connection part when the power transmission iron tower is connected with the foundation in a main angle steel insertion mode or a foundation bolt connection mode, and is characterized by comprising the following specific steps of:
(1) rust removal is carried out on the contact part of the power transmission iron tower and the foundation: when the power transmission iron tower is connected with the foundation in a main angle steel insertion mode and corrosion does not permeate into the surface of the foundation, oil dirt on the metal surface of a contact part of the power transmission iron tower and the foundation is directly treated, and rust removal is carried out on a corrosion area of the contact part; when the power transmission iron tower and the foundation are connected in a main angle steel insertion mode and corrode and infiltrate into the surface of the foundation, grooves are formed around the contact part of the power transmission iron tower and the foundation to completely expose the corrosion part of the tower foot, then oil dirt on the metal surface of the contact part of the power transmission iron tower and the foundation is treated, and rust removal is carried out on the corrosion area of the contact part; when the power transmission iron tower is connected with the foundation through the foundation bolts, the cement tower cap is directly disassembled, then oil dirt on the metal surface of the contact part of the power transmission iron tower and the foundation is treated, and the corrosion area of the contact part is derusted;
(2) removing an old paint film at a contact part of the transmission tower and the foundation, and painting anti-rust paint on the treated part;
(3) after the paint in the step (2) is dried, performing secondary plugging operation, wrapping the contact part of the transmission tower and the foundation by using butyl rubber, then formulating hollow molds with different heights according to different conditions in the step (1), sleeving the hollow molds on the contact part of the transmission tower wrapped with the butyl rubber layer and the foundation, and after the hollow molds are installed, raising the height of the hollow molds by 10-15 cm above the upper surface of the foundation and raising the height of the hollow molds above the wrapping height of the butyl rubber layer; when the groove is formed, the lower part of the cylindrical mold is inserted into the groove;
(4) and (4) after the cylindrical mould in the step (3) is stably installed, pouring air-tight concrete in the mould until the air-tight concrete is stable.
The invention has the following excellent technical scheme: the method aims at the conditions that the contact part of the power transmission iron tower and the foundation is slightly corroded and moderately corroded, the corrosion degree of the slight corrosion is limited to the surface, the slight corrosion does not penetrate into a tower footing or penetrates into the tower footing within 2 centimeters, and the tower footing is not incomplete; the judgment standard of the moderate corrosion is as follows: corroding and permeating the tower footing for 2-6 cm, wherein a few defects, cavities and the like appear on the tower footing, and the integral integrity of the tower footing is more than 80%.
The invention has the following excellent technical scheme: the airtight concrete in the step (4) is prepared from the following substances in percentage by weight: 7-11% of water, 16-21% of fine aggregate, 47-55% of coarse aggregate, 13-17% of cement, 1-3% of air-tight agent, 1-3% of cementing material and 3-5% of coal ash powder; wherein the air sealing agent is a DC-C3 air sealing agent or a DRX-C3 air sealing agent; the cementing material is portland cement clinker or magnesium sulfate solution or ferrous sulfate solution.
The invention has the following excellent technical scheme: and (2) treating oil stains on the metal surface of the contact part of the power transmission tower and the foundation in the step (1) by adopting a surfactant solution, and brushing the surfactant solution on the metal surface from top to bottom by adopting a brush, wherein the surfactant solution is prepared by adding 10-15 g of 664 cleaning agent, 35-45 g of sodium hydroxide and 10-14 g of 105 detergent into each liter of water.
The invention has the following excellent technical scheme: in the step (1), rust removal is performed on a corrosion area of a contact part of the power transmission iron tower and the foundation by adopting an acid solution, wherein the acid solution is prepared from the following components in percentage by weight: 7-9% of hydrochloric acid, 0.08-0.12% of sulfuric acid, 0.3-0.5% of urotropine and 90-94% of water, and directly injecting the prepared acid solution into a corrosion area after being packaged by a glass container.
The invention has the following excellent technical scheme: in the step (1), when the power transmission iron tower and the foundation are connected in a main angle steel insertion mode and corrode and infiltrate into the surface of the foundation, a small grooving machine is adopted to form a cylindrical groove around the contact part of the power transmission iron tower and the foundation, the depth of the groove is 2 cm-5 cm, and the overall diameter of the groove is not more than half of the side length of the foundation.
The invention has the following excellent technical scheme: and (3) removing the old paint film at the contact part of the power transmission tower and the foundation by adopting a paint film remover with the model of CHD-2600 in the step (2), and coating 100-150 g of the paint film remover per square meter.
The invention has the following excellent technical scheme: when the antirust paint is painted in the step (2), firstly, two layers of epoxy zinc-rich primer are painted, then one layer of polyurethane gray finish paint is painted, the tower foot is covered during painting, and the thickness of each layer of paint is 35-45 mu m.
The invention has the following excellent technical scheme: the thickness of the butyl rubber package in the step (3) is 0.8-1.2 cm, and the height of the butyl rubber package is 0.5-1 cm lower than that of the hollow mold.
The invention has the following excellent technical scheme: the hollow mould in the step (3) is a cylindrical mould made of ABC plastic, and is specifically a cylindrical structure formed by butting two half cylinders through connecting members, and the two half cylinders are connected through a plug-in type or a clamping type or a connecting buckle; the mould is 0.8-1.2 cm; when the power transmission iron tower is connected with the foundation in a main angle steel insertion mode and the groove is formed, the outer diameter of the cylindrical mold is equal to the inner diameter of the groove; when the power transmission iron tower is connected with the foundation in a main angle steel insertion mode and a groove is not formed, the outer diameter of the cylindrical mold is not larger than half of the side length of the foundation; when the power transmission iron tower is connected with the foundation through the foundation bolts, the diameter of the cylindrical die is equal to the side length of the original tower cap, and the height of the cylindrical die is equal to the height of the original tower cap.
The corrosion rating is divided into three levels in the present invention. Slight corrosion: the corrosion degree is limited to the surface, the tower footing is not penetrated or a small amount (within 2 cm) of the corrosion degree is penetrated into the surface of the foundation, and the tower footing is not imperfect; moderate corrosion: the corrosion is serious, the corrosion penetrates into the tower footing by 2-6 cm, a few defects, cavities and the like appear on the tower footing, but the integral integrity of the tower footing is more than 80%; severe corrosion: the corrosion is very serious, the corrosion depth of the tower foot is more than 6 cm, the tower foot has a plurality of defects and cavities, the stability is almost lost, when the corrosion grade reaches a severe grade, the corrosion prevention treatment is performed late, measures need to be taken to fix the tower foot firstly, the accident is avoided, and then the corresponding measures are further taken to treat the tower foot.
In the invention, considering that the oil stain is often the first layer of dirt attached to the surface of the metal, in order to ensure the later work, the oil stain needs to be fully cleaned and removed in the early stage, and the antirust coating can be coated only under the condition that the surface of the metal has no oil stain, so that the antirust work can be more effectively carried out. Oil stain is different from other dirt, is better treated and is the first process for developing subsequent treatment. In practice, the oil stain adhered to the metal is usually cleaned by using a surfactant, which is a safe and effective method, so that the oil stain can be completely removed, and chemical components in the surfactant cannot react with iron. Organic solvent or alkali liquor is often adopted in the past, and although the cleaning effect is good, some components in the organic solvent or alkali liquor are easy to react with iron and pollute the environment. Therefore, the surfactant is the safest and effective method for cleaning the oil stains. Because the power transmission iron tower is made of steel, the steel is corroded and rusted certainly, and the components of the rust on the steel are mainly FeO and Fe2O3、Fe3O4All three substances can be dissolved in acidic solutionTherefore, rust is generally removed by using an acid washing solution. The acid solution can be prepared from hydrochloric acid, sulfuric acid and nitric acid according to a certain proportion, but generally, the hydrochloric acid has the strongest solubility and is proper in price, so the hydrochloric acid reagent can be mainly used for removing rust.
The old paint film is an old protective film on the iron tower of the power transmission line, and generally falls off or breaks after a period of time or by other factors, so that the iron tower loses the protection. In the chemical treatment process before coating a new paint film, the old paint film needs to be effectively treated to directly coat the new paint film, otherwise, the thickness of the paint film on an iron tower is gradually accumulated, and once the iron tower is irradiated by sunlight or is subjected to other reasons, the iron tower is easy to crack and fall off. And for the selection of a paint film, the zinc-rich paint is an epoxy zinc-rich heavy-duty anticorrosion powder paint, the content of zinc powder is 85-95%, the paint film is thin, the cost is low, the anticorrosion performance is excellent, the mechanical performance is good, the adhesion force is strong, the electric conductivity and the cathode protection function are realized, and the zinc-rich paint is used as an antirust primer to be coated twice, wherein the thickness of each time is about 40 micrometers. The polyurethane gray finish paint has good chemical resistance and water resistance; mineral oil, vegetable oil, petroleum solvents, and other petroleum products; the paint film is tough, good in gloss, quick in drying, heat-resistant, not soft and not sticky, and is used as a finish paint, a layer of paint with thickness of about 40 micrometers is coated on the finish paint, and tower legs are covered when the finish paint is coated.
After the antirust paint is coated, firstly, the tower foot is hermetically wrapped by butyl rubber for the first time, and then, the tower foot is sealed by airtight soil for the second time. The butyl rubber is synthesized by isobutene and a small amount of isoprene, has good air tightness, can resist heat, ozone, aging and chemicals, and has shock absorption and electrical insulation properties; the airtight concrete is the concrete which is penetrated with a certain amount of air-tight agent in the concrete construction to improve the air-tight performance of the concrete, the air-tight performance of the airtight concrete is several times or even ten times of that of the common concrete, and the combination of the butyl rubber and the airtight concrete enables the contact part of the iron tower and the foundation to be isolated from the external environment and completely corroded.
The invention has the beneficial effects that:
(1) aiming at different tower foot conditions, the reasonable treatment method is adopted for the tower feet, the problem that the corrosion degree is difficult to judge in the actual life is solved, and a solid foundation is laid for later derusting;
(2) the invention carries out a whole set of rust removing treatment aiming at different insertion modes of the tower foot of the iron tower, and the whole set of rust removing process sequentially comprises the steps of slotting the periphery of the tower foot or removing a tower cap, treating oil dirt on the surface of metal, removing iron rust, removing an old paint film and coating antirust paint, so that the corrosion resistance is improved;
(3) the metal surface oil stain is cleaned by adopting the surfactant, so that the oil stain can be thoroughly cleaned, and components in the surfactant can not react with iron; the rust removal adopts an acid solution, wherein hydrochloric acid is mainly used, the solubility is strongest, the price is proper, and the cost is reduced; the antirust paint is coated with two layers by adopting epoxy zinc-rich as a primer, and then coated with one layer by adopting polyurethane gray finish, a compact protective film with high stability can be formed on the surface of the iron tower, and the coating is much thinner than the traditional coating, and can not crack or fall off even after long-time sunshine;
(4) according to the invention, the tower foot after rust removal treatment is wrapped by butyl rubber, and then sleeved with a mould to be secondarily blocked by air-tight concrete; the butyl rubber can be attached to the tower foot to isolate the external environment, and has the characteristics of good air tightness, heat resistance, weather resistance, oil resistance, corrosion resistance and the like; the mold is made of ABS plastic, so that the stability and the durability are good; the air tightness of the air-tight concrete is several times or even tens of times of that of common concrete; the tower foot is sealed in an airtight mode through the combination of the butyl rubber and the airtight concrete, so that the tower foot is prevented from being in contact with the external environment, and the problem that the tower foot of the iron tower is prone to corrosion is solved fundamentally.
The invention directly isolates the easy-to-corrode part from the air through a series of anti-corrosion measures, thereby avoiding the occurrence of corrosion, greatly improving the operation safety and stability of the power transmission tower and reducing accidents caused by corrosion of the tower.
Drawings
FIG. 1 is a schematic view of an anticorrosion construction structure in a first embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
fig. 3 is a schematic structural view of the cylindrical mold of the present invention.
In the figure: the concrete comprises, by weight, 1-tower foot main steel, 2-foundation, 3-groove, 4-hollow mould, 4-1-left half cylinder, 4-2-right half cylinder, 5-butyl rubber wrapping layer and 6-airtight concrete.
Detailed Description
The present invention will be further described with reference to the following specific examples. Fig. 1 to note, the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, or combinations thereof, unless the context clearly indicates otherwise.
The airtight concrete in the following examples is prepared from the following substances in parts by weight: 177 parts of water, 475 parts of fine aggregate, 1276 parts of coarse aggregate, 360 parts of cement, 29 parts of DC-C3 airtight agent, 20 parts of portland cement clinker and 75 parts of coal ash powder; the diameter of the fine aggregate particles is between 0.16 and 5mm, natural sand such as river sand, sea sand, valley sand and the like is generally adopted, and when the natural sand is lacked, artificial sand ground by hard rocks can be used; the coarse aggregate has a particle diameter of more than 5mm, and is commonly used with crushed stones and pebbles.
The surfactant solution for removing the oil stain on the metal surface in the following examples is prepared by adding 13g of 664 cleaning agent, 40g of sodium hydroxide and 12g of 105 detergent into each liter of water; wherein the 664 cleaning agent and the 105 detergent are both directly purchased finished products.
The rust removing acid solution in the following examples is a solution prepared by dissolving hydrochloric acid, sulfuric acid and urotropine in water, wherein the hydrochloric acid concentration is 8%, the sulfuric acid concentration is 0.1%, and the urotropine concentration is 0.4%.
The hollow mold 4 in the following embodiments is a cylindrical mold made of ABS plastic, and the specific structure is shown in fig. 3, and includes a left half cylinder 4-1 and a right half cylinder 4-2, wherein the butt-joint surface of one half cylinder is provided with a butt-joint slot, the butt-joint surface of the other half cylinder is correspondingly provided with an insert, and the insert of the two half cylinders after butt-joint is correspondingly inserted into the slot to form a sealed cylinder structure. Besides the structure shown in fig. 2, the two half cylinders can be connected in other clamping modes, or one side of the two half cylinders is hinged and the other side of the two half cylinders is connected through a connecting component.
The embodiment relates to an anticorrosion operation for a 500KV power transmission iron tower in Yichang in Hubei, the power transmission iron tower is a main angle steel insertion type iron tower, main steel 1 of four tower legs of the power transmission iron tower is inserted into a foundation 2, firstly, the corrosion degree of a contact part of the power transmission iron tower and the foundation is judged, the corrosion degree of two tower legs in the four tower legs of the main angle steel insertion type iron tower is relatively serious, the corrosion degree of the two tower legs is penetrated into the foundation by 2-6 cm, particularly, the corrosion degree of a hidden surface (a surface which cannot be irradiated by sunlight all the year round) of the tower legs is very serious, rainwater is easy to accumulate and reacts with oxygen in the air and the tower legs, and the other two tower legs are relatively wide in position, large plants and the like are not shielded at the periphery, so that sunlight can be directly irradiated, and only some parts of the tower legs are. The method disclosed by the invention is used for carrying out anticorrosion work on the tower foot of the iron tower, and the anticorrosion steps of each tower foot are as follows:
(1) rust removal is carried out on the contact part of the power transmission iron tower and the foundation: a small grooving machine is adopted to form a circular groove 3 with the overall diameter of 15cm and no more than one-half of the side length of the foundation 2 and the depth of within 5cm on the periphery of the contact part of the tower foot main steel 1 and the foundation 2 of the transmission tower, the groove 3 is completely exposed out of the corrosion part of the tower foot, then the prepared surfactant solution is adopted to treat oil dirt on the metal surface of the contact part of the transmission tower and the foundation, and the prepared acid solution is used for removing rust on the corrosion area of the contact part;
(2) removing an old paint film on a contact part of a power transmission tower and a foundation by using a CHD-2600 type paint film remover, generally coating 100-150 g per square meter, if the thickness is too thick, adding the old paint film, after removing the old paint film, firstly coating two layers of epoxy zinc-rich primer, then coating a layer of polyurethane gray finish, covering tower legs during painting, and enabling the thickness of each layer of paint to be about 40 mu m;
(3) after the paint in the step (2) is dried, performing secondary plugging operation, wrapping the contact part of the power transmission tower and the foundation 1 by using butyl rubber, then formulating a hollow mold 4 according to the structure of the mold, wherein the diameter of the hollow mold is equal to the inner diameter of the groove 3 in the step (1), the hollow mold can be embedded into the groove 3, the thickness of the mold is 1cm, when in installation, two half cylinders are symmetrically sleeved on two sides of the power transmission tower foot main steel 1, and then are correspondingly clamped to form a complete hollow cylinder sleeved on the power transmission tower foot main steel 1, the specific structure is shown in figures 1 and 2, after the hollow mold 4 is installed, the hollow mold 4 is 10-15 cm higher than the upper surface of the foundation and is higher than the coating height of the butyl rubber layer 5 by about 1 cm;
(4) and (4) after the cylindrical mould in the step (3) is stably installed, pouring air-tight concrete 6 in the mould until the air-tight concrete is stable.
The second embodiment aims at performing anticorrosion work on a 500KV power transmission iron tower in Yichang in Hubei, the power transmission iron tower is connected with a foundation in a mode of connecting foundation bolts, the geographical position of the iron tower is better, the corrosion degree of four tower legs is slight, only one tower leg is slightly more serious compared with the other tower leg (because some wild plants cover the influence of sunlight), the corrosion degree of the iron tower reaches a tower cap, so the corrosion should penetrate the tower cap, but the integral corrosion degree is lighter, the corrosion range is larger, and the iron tower belongs to slight corrosion.
(1) Rust removal is carried out on the contact part of the power transmission iron tower and the foundation: under the condition of ensuring the stability of the power transmission iron tower, directly disassembling a cement tower cap, then treating oil dirt on the metal surface of a contact part between the power transmission iron tower and a foundation by adopting the prepared surfactant solution, and removing rust on a corrosion area of the contact part by using the prepared acid solution;
(2) removing an old paint film on a contact part of a power transmission tower and a foundation by using a CHD-2600 type paint film remover, generally coating 100-150 g per square meter, if the thickness is too thick, adding the old paint film, after removing the old paint film, firstly coating two layers of epoxy zinc-rich primer, then coating one layer of polyurethane gray finish, covering tower legs during painting, and enabling the thickness of each layer of paint to be about 40 mu m;
(3) after the paint in the step (2) is dried, performing secondary plugging operation, wrapping the contact part of the power transmission tower and the foundation 1 by using butyl rubber, then formulating a hollow mold 4 according to the structure of the mold, wherein the diameter and the height of the hollow mold are not more than those of an original cement tower cap, the thickness of the mold is 1cm, when in installation, firstly symmetrically sleeving two half cylinders on two sides of the power transmission tower foot main steel 1, then correspondingly clamping to form a complete hollow cylinder sleeved on the power transmission tower foot main steel 1, and after the hollow mold 4 is installed, the hollow cylinder is 10-15 cm higher than the upper surface of the foundation and is about 1cm higher than the wrapping height of the butyl rubber layer 5;
(4) after the cylindrical mould in the step (3) is stably installed, pouring air-tight concrete 6 in the mould until the air-tight concrete is stable; and then pouring a tower cap to finish the anticorrosion work.
The inventor of the present application performed detection on the iron tower subjected to the corrosion prevention treatment in the first embodiment and the second embodiment every 3 months, and performed photographing, sampling, analysis, and the like for 5 cycles each. In 5 periods, the tower feet of the two test iron towers are not rusted, and the tower cap newly poured in the second embodiment is intact. Tests can prove that the invention has good anticorrosion effect, compared with the traditional anticorrosion mode, the invention has better effect in both service life and anticorrosion effect, the traditional cement plugging does not consider that the cement has gaps, so that water can permeate into the foundation or the tower cap to create the corrosive condition, and the invention directly isolates the air to completely eliminate the corrosive condition, thereby achieving good anticorrosion.
The inventor of the application carries out the following test comparison on the performance of the airtight concrete in the embodiment, and the comparison is carried out by adopting four groups of concrete, wherein C30-II is the concrete formula in the embodiment of the invention, and the mixture ratio of the four groups of concrete is shown in Table 1:
TABLE 1 concrete mixing proportion table
The four concrete formulas are adopted to prepare test pieces for detection according to the preparation process of the concrete, each group of concrete is prepared with a plurality of test pieces for testing, the size of each test piece is 50mm multiplied by 150mm, and the performance of the concrete test pieces prepared by testing the four groups of concrete formulas is shown in table 2:
TABLE 2 concrete Performance Table after test
Remarking: the test piece size is 50mm multiplied by 150mm
The soaking concentration is saturated sodium sulfate solution, and the soaking age is 6 months;
the corrosion resistance coefficient is calculated according to GB 2420-81.
According to the data in the table, the plugging material of the invention with test number C30-II is selected, which has higher strength and better performances in compression strength, impermeability, permeability and corrosion resistance. Completely meets the requirements of being used as a plugging material for tower feet of an iron tower.
Although the foregoing embodiments have described specific embodiments of the present invention, it is not intended to limit the scope of the invention, and those skilled in the art will appreciate that various modifications and variations can be made without inventive faculty, and without departing from the scope of the invention.
Claims (10)
1. An anticorrosion treatment method for a contact part between a power transmission iron tower and a foundation, which is used for treating corrosion of the connection part when the power transmission iron tower and the foundation are connected in a main angle steel insertion mode or a foundation bolt connection mode, and is characterized by comprising the following specific steps:
(1) rust removal is carried out on the contact part of the power transmission iron tower and the foundation: when the power transmission iron tower is connected with the foundation in a main angle steel insertion mode and corrosion does not permeate into the surface of the foundation, oil dirt on the metal surface of a contact part of the power transmission iron tower and the foundation is directly treated, and rust removal is carried out on a corrosion area of the contact part; when the power transmission iron tower and the foundation are connected in a main angle steel insertion mode and corrode and infiltrate into the surface of the foundation, grooves are formed around the contact part of the power transmission iron tower and the foundation to completely expose the corrosion part of the tower foot, then oil dirt on the metal surface of the contact part of the power transmission iron tower and the foundation is treated, and rust removal is carried out on the corrosion area of the contact part; when the power transmission iron tower is connected with the foundation through the foundation bolts, the cement tower cap is directly disassembled, then oil dirt on the metal surface of the contact part of the power transmission iron tower and the foundation is treated, and the corrosion area of the contact part is derusted;
(2) removing an old paint film at a contact part of the transmission tower and the foundation, and painting anti-rust paint on the treated part;
(3) after the paint in the step (2) is dried, performing secondary plugging operation, wrapping the contact part of the transmission tower and the foundation by using butyl rubber, then formulating hollow molds with different heights according to different conditions in the step (1), sleeving the hollow molds on the contact part of the transmission tower wrapped with the butyl rubber layer and the foundation, and after the hollow molds are installed, raising the height of the hollow molds by 10-15 cm above the upper surface of the foundation and raising the height of the hollow molds above the wrapping height of the butyl rubber layer; when the groove is formed, the lower part of the cylindrical mold is inserted into the groove;
(4) and (4) after the cylindrical mould in the step (3) is stably installed, pouring air-tight concrete in the mould until the air-tight concrete is stable.
2. The anticorrosion treatment method for the contact part between the transmission tower and the foundation according to claim 1, characterized in that: the method aims at the conditions that the contact part of the power transmission iron tower and the foundation is slightly corroded and moderately corroded, the corrosion degree of the slight corrosion is limited to the surface, the slight corrosion does not penetrate into a tower footing or penetrates into the tower footing within 2 centimeters, and the tower footing is not incomplete; the judgment standard of the moderate corrosion is as follows: corroding and permeating the tower footing for 2-6 cm, wherein a few defects, cavities and the like appear on the tower footing, and the integral integrity of the tower footing is more than 80%.
3. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: the airtight concrete in the step (4) is prepared from the following substances in percentage by weight: 7-11% of water, 16-21% of fine aggregate, 47-55% of coarse aggregate, 13-17% of cement, 1-3% of air-tight agent, 1-3% of cementing material and 3-5% of coal ash powder; wherein the air sealing agent is a DC-C3 air sealing agent or a DRX-C3 air sealing agent; the cementing material is portland cement clinker or magnesium sulfate solution or ferrous sulfate solution.
4. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: and (2) treating oil stains on the metal surface of the contact part of the power transmission tower and the foundation in the step (1) by adopting a surfactant solution, and brushing the surfactant solution on the metal surface from top to bottom by adopting a brush, wherein the surfactant solution is prepared by adding 10-15 g of 664 cleaning agent, 35-45 g of sodium hydroxide and 10-14 g of 105 detergent into each liter of water.
5. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: in the step (1), rust removal is performed on a corrosion area of a contact part of the power transmission iron tower and the foundation by adopting an acid solution, wherein the acid solution is prepared from the following components in percentage by weight: 7-9% of hydrochloric acid, 0.08-0.12% of sulfuric acid, 0.3-0.5% of urotropine and 90-94% of water, and directly injecting the prepared acid solution into a corrosion area after being packaged by a glass container.
6. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: in the step (1), when the power transmission iron tower and the foundation are connected in a main angle steel insertion mode and corrode and infiltrate into the surface of the foundation, a small grooving machine is adopted to form a cylindrical groove around the contact part of the power transmission iron tower and the foundation, the depth of the groove is 2 cm-5 cm, and the overall diameter of the groove is not more than half of the side length of the foundation.
7. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: and (3) removing the old paint film at the contact part of the power transmission tower and the foundation by adopting a paint film remover with the model of CHD-2600 in the step (2), and coating 100-150 g of the paint film remover per square meter.
8. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: when the antirust paint is painted in the step (2), firstly, two layers of epoxy zinc-rich primer are painted, then one layer of polyurethane gray finish paint is painted, the tower foot is covered during painting, and the thickness of each layer of paint is 35-45 mu m.
9. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: the thickness of the butyl rubber package in the step (3) is 0.8-1.2 cm, and the height of the butyl rubber package is 0.5-1 cm lower than that of the hollow mold.
10. The method for the anticorrosion treatment of the contact part between the transmission tower and the foundation according to claim 1 or 2, wherein the method comprises the following steps: the hollow mould in the step (3) is a cylindrical mould made of ABC plastic, and is specifically a cylindrical structure formed by butting two half cylinders through connecting members, and the two half cylinders are connected through a plug-in type or a clamping type or a connecting buckle; when the power transmission iron tower is connected with the foundation in a main angle steel insertion mode and the groove is formed, the outer diameter of the cylindrical mold is equal to the inner diameter of the groove; when the power transmission iron tower is connected with the foundation in a main angle steel insertion mode and a groove is not formed, the outer diameter of the cylindrical mold is not larger than half of the side length of the foundation; when the power transmission iron tower is connected with the foundation through the foundation bolts, the diameter of the cylindrical die is equal to the side length of the original tower cap, and the height of the cylindrical die is equal to the height of the original tower cap.
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