Scheme I: steel structure anti-corrosion construction scheme

1. Anti corrosion measures for steel structure

(1) Weathering steel: the steel with better corrosion resistance than general structural steel is called weathering steel, which generally contains phosphorus, copper, nickel, chromium, titanium and other metals to form a protective layer on the metal surface to improve corrosion resistance.Its low temperature impact toughness is also better than that of general structural steel.The standard is weathering steel for welded structure (gb4172-84).

(2) Hot dip galvanizing: hot dip galvanizing is to immerse the derusted steel member into the molten zinc at 600 ℃ to make the surface of the steel member adhere to the zinc layer. The thickness of the zinc layer shall not be less than 65 μ m for the thin plate less than 5mm and 86 μ m for the thick plate.So as to prevent corrosion.The advantages of this method are long service life, high degree of industrialization and stable quality.Therefore, it is widely used in outdoor steel structure which is seriously corroded by atmosphere and is not easy to maintain.Such as a large number of transmission towers, communication towers, etc.In recent years, a large number of profiled steel sheet in light steel structure system have appeared.Hot dip galvanizing is also widely used to prevent corrosion.The first process of hot dip galvanizing is pickling and derusting, and then cleaning.If these two processes are not complete, they will leave hidden dangers for corrosion prevention.So it has to be dealt with thoroughly.For steel structure designers, it is necessary to avoid designing components with joint surface, so as to avoid incomplete pickling or unclean acid solution in the joints.The phenomenon of yellow water flowing on the surface of galvanized steel is caused.Hot dip galvanizing is carried out at high temperature.For tubular members, both ends should be open.If both ends are closed, the air in the pipe will expand and the head plate will burst, thus causing safety accidents.If one end is closed, the liquid zinc will not flow smoothly and easy to accumulate in the tube.

(3) Thermal spraying aluminum (zinc) composite coating: This is a long-term anti-corrosion method equivalent to hot-dip galvanizing.The specific method is to remove rust on the surface of steel members by sand blasting, so as to expose metal luster and roughen the surface.Then the heat source (acetylene oxygen combustion flame, arc, plasma arc, etc.) of thermal spraying equipment will melt the aluminum (zinc) wire continuously sent out, and blow it to the surface of steel members with compressed air to form a honeycomb aluminum (zinc) spraying layer (thickness of about 80 μ m ~ 100 μ m).Finally, the pores were filled with epoxy resin or neoprene paint to form composite coating.This method can not be used in the inner wall of the tubular member, so the two ends of the tubular component must be sealed to prevent the inner wall from corrosion.The advantage of this process is that it has strong adaptability to the size of components, and the shape and size of components are almost unlimited.Shiplocks as large as Gezhouba are also constructed in this way.Another advantage is that the heat effect of this process is local and constrained, so it will not produce thermal deformation.Compared with hot-dip galvanizing, the industrialization degree of this method is lower, and the labor intensity of sand blasting aluminum (zinc) is higher.

(4) Coating method: the corrosion resistance of coating method is generally not as good as that of long-term anti-corrosion method (but the anti-corrosion life of fluorocarbon coating can even reach 50 years).Therefore, there are more indoor steel structures or outdoor steel structures which are relatively easy to maintain.It has a low cost at one time, but it has a higher maintenance cost when used outdoors.The first step of coating method is to remove rust.A good coating depends on thorough rust removal.Therefore, the coating with high requirements is usually derusted by sandblasting and shot peening to expose the luster of metal and remove all rust and oil stains.The coating applied on site can be derusted by hand.The selection of coating should consider the surrounding environment.Different coatings have different resistance to different corrosion conditions.The coating is generally divided into primer (layer) and topcoat (layer).The primer contains more powder and less base material.The film is rough, has strong adhesion with steel and good adhesion with topcoat.The top coat has more base materials, glossy film, which can protect the primer from atmospheric corrosion and weathering.The compatibility of different coatings should be paid attention to when choosing different coatings.Proper temperature (5 ~ 38 ℃) and humidity (relative humidity no more than 85%) should be adopted for coating construction.The construction environment of coating should be less dust and there should be no condensation on the surface of components.No rain within 4 hours after painting.Coating is usually done 4 ~ 5 times.The total thickness of dry paint film is 150 μ m for outdoor engineering and 125 μ m for indoor engineering, and the allowable deviation is 25 μ M.The total thickness of dry paint film can be increased to 200 ~ 220 μ m on the sea or in the strong corrosive atmosphere.

(5) Cathodic protection method: the corrosion of steel is replaced by active metal on the surface of steel structure.It is often used in underwater or underground structures. 

2. Installation points of steel structure

(1) Friction coefficient: where f is the force that causes the initial slip of the specimen measured by the anti slip test, NF is the number of friction surfaces, and is the sum of the measured values of the pre tension of the high strength bolt corresponding to F. 

(2) Torque coefficient: where D is the nominal diameter of high strength bolt (mm), M is the applied torque value (n · m), and P is the bolt preload.The average value of torque coefficient K must be 0.110 ~ 0.150 for 10.9 grade high strength large hexagon bolt connection.The standard deviation should be less than or equal to 0.010. 

(3) Initial tightening torque: in order to reduce the influence of steel plate deformation during bolt tightening, secondary tightening can be used to reduce the interaction between successively tightening bolts.The first tightening of high strength bolt is the initial tightening, so that its axial force should reach 60% – 80% of the standard axial force.

(4) Final tightening torque: the final tightening torque of high strength bolt is the final tightening torque.Considering the loss of prestress, the final tightening torque is generally 5% – 10% larger than that calculated theoretically according to the design pretension.

3. Acceptance of steel structure

(1) Guarantee item: the guarantee item is an important inspection item to ensure the engineering safety or use function.No matter whether the quality grade is qualified or excellent, it must all meet the requirements of specified indexes.For different sub projects, the contents of guarantee items are clearly specified in GB 5021-95.

(2) Basic items: basic items are the basic inspection items to ensure the safety or use function of the project, and their indicators are divided into “qualified” and “excellent”, which is one of the conditions for evaluating the quality level of sub projects.

(3) Allowable deviation items: the allowable deviation items are items with allowable deviation range specified in the actual measurement and inspection of sub divisional works.During the inspection and evaluation, a small number of sampling points are allowed, and the measured values slightly exceed the allowable deviation range.

(4) Impression quality score: the appearance quality is evaluated by more than three people.The inspection items and standards of steel structure processing and installation are shown in the table below.In the evaluation of appearance quality, 10 points are selected for each project and graded according to the qualified rate. The standard is shown in the appearance quality evaluation standard table.

[knowledge of surface treatment before painting]

In the process of processing, transportation and storage, the surface of workpiece often contains oxide scale, rust, molding sand, welding slag, dust, oil and other dirt.In order to make the deep layer firmly adhere to the surface of the workpiece, the surface of the workpiece must be cleaned before coating. Otherwise, it will not only affect the binding force and corrosion resistance of the coating and the base metal, but also make the base metal continue to corrode even if there is coating protection, so that the coating will peel off and affect the mechanical properties and service life of the workpiece.Therefore, the surface treatment before painting is an important guarantee and measure to obtain good quality protective layer and prolong the service life of products.

In order to provide a good surface of the workpiece, the surface treatment of the workpiece before painting has the following points:

1.No oil and moisture

2.No rust and oxide

3.No adhesive impurities

4.No acid and alkali residue

5.The workpiece surface has a certain roughness

The common surface treatment methods are as follows:

Manual processing: such as scraper, wire brush or grinding wheel.The rust and oxide scale on the surface of the workpiece can be removed by hand, but the manual treatment has the advantages of high labor intensity, low production efficiency, poor quality and incomplete cleaning.

Chemical treatment: it mainly uses the acid or alkaline solution to react with the oxide and oil stain on the surface of the workpiece to dissolve in the acidic or alkaline solution to remove the rust, scale and oil on the surface of the workpiece.Chemical treatment is suitable for the cleaning of sheet metal, but its disadvantage is that if the time is not controlled properly, even if corrosion inhibitor is added, the steel will produce over corrosion phenomenon.For more complex structural parts and parts with holes, after acid pickling with acid solution, it is difficult to completely remove the residual acid immersed in the gap or hole. If not handled properly, it will become the hidden danger of corrosion of the workpiece in the future, and the chemicals are easy to volatilize, and the cost is high, and the chemical emission after treatment is difficult. If not handled properly, it will cause serious pollution to the environment.With the improvement of people’s awareness of environmental protection, this treatment method is being replaced by mechanical treatment.

Mechanical treatment: mainly including shot blasting and shot peening.Shot blasting cleaning is a method that uses centrifugal force to accelerate the shot and shoot it to the workpiece for rust removal and cleaning.However, due to the limitation of the site and the poor flexibility of shot blasting, there are some blindness in the cleaning of the workpiece, resulting in the dead corner on the inner surface of the workpiece.The structure of the equipment is complex, and there are many vulnerable parts, especially the blades and other parts, which wear quickly, have many maintenance hours, high cost and large one-time investment.

Shot blasting is divided into shot blasting and sand blasting.The surface treatment by shot peening has great impact force and obvious cleaning effect.However, shot peening is easy to deform the workpiece, and the steel shot strikes the surface of the workpiece (no matter shot blasting or shot peening) to deform the metal substrate. Because Fe3O4 and Fe2O3 have no plasticity, they peel off after crushing, and the oil film and the substrate deform together. Therefore, for the workpiece with oil stain, shot blasting and shot peening can not completely remove the oil stain.Among the existing surface treatment methods, the best cleaning effect is sand blasting.Sand blasting is suitable for the cleaning of workpiece surface with high requirements.However, the current general sand blasting equipment in our country is mainly composed of hinge dragon, scraper, bucket elevator and so on.Users need to build a deep pit and waterproof layer to install machinery. The construction cost is high, and the maintenance workload and maintenance cost are huge. A large amount of silica dust generated in the sand blasting process cannot be removed, which seriously affects the health of operators and pollutes the environment.

With the continuous improvement of science and technology, with the continuous requirements for product quality, with the continuous application of high-tech equipment in enterprises, with the improvement of people’s environmental awareness and strict requirements of environmental protection departments, it is urgent to control dust pollution and noise environment.The competition of enterprises is more and more fierce, so how to gain advantages in the fierce competition becomes the key to the development of enterprises.Facts tell us that strict control of production links is the premise of ensuring the quality of enterprise products, and it is the responsibility of each of us to control environmental pollution.

Scheme 2: anti-corrosion construction scheme of new steel structure

1、 Planning Standards

1）The formulation of the plan refers to the requirements of high-phase closed field standard scale: the primer and topcoat used in the construction of steel structure anti-corrosion paint are in accordance with the relevant requirements of the state for the construction of steel structure anti-corrosion primer and finish.

2、 Tools and machines required in the project:

Spray gun: including spray gun, sand blasting gun, etc.; return tools: including air pump, spray paint air pump, large-scale tightening machine; in addition, there are some rare construction tools.

3、 Construction work shall provide:

3.1 Steel structure anti-corrosion paint workers must hold a special type of work operation certificate before they can be laid off.

3.2 Steel structure anti-corrosion paint anti-corrosion coating industry site should have sufficient insurance protection measures, with special staff for waterproof and ventilation measures, to avoid flooding or staff poisoning in the process of anti-corrosion painting.

3.4 Steel structure anti-corrosion paint work, if it is in the end of anti-corrosion construction work, we should consider the construction site to choose the appropriate weather.

4、 Construction technology of anti-corrosion paint for steel structure:

1Process flow:

First, the surface of the steel structure (including dust removal, rust removal, etc.) → then the first coat of primer painting → the second time of top coat painting → repair circle for project quality review and inspection

(1) The clearing process for the exterior surface of steel structure during anti-corrosion painting is as follows:

a. The steel structure shall be painted with primer, so the corresponding clearing operation shall be carried out for the parts to be coated and unloaded before the application of the primer is withdrawn, that is, in the current construction, dust, rust stains, oil stains, etc. of the important parts to be painted.b. The liquidation of the brushing position will indirectly affect the quality of the top coating.Therefore, in order to further improve the construction technology, the quality of steel structure rust removal is always the first level and the second level.

c. The so-called primary derusting should make the steel surface may show the unique color without metal.

d. The so-called secondary derusting is to make the steel surface appear metallic luster, by the wrong metal surface for a certain degree of grinding, so that the primer can contact with the surface of the steel structure, to achieve a worse anti-corrosion effect.

5、 Two stage derusting is often used in derusting.

1 Sand blasting is the most widely used and the last method to remove rust. Its work principle is to use the pressure pump to distribute the compressed air to the west of quartz sand or iron sand, and spray it quickly to clean the surface of steel structure. By rubbing and bumping, the rust and oil on the surface of steel structure will be cleaned, and the method is the most rarely usedThis kind of derusting method, the grade of derusting after derusting is grade II, and the effect is excellent.

2 Pickling derusting method, which is often used before, is a derusting construction method. Its work principle is to remove the steel structure from the height and soak it into the acid solution for rust removal. This method is also highly effective, and rust removal is absolutely thorough. However, the construction is more troublesome, and the most important thing is that the structure after rust removal by soaking in acid solution must be flushed with cold fire or clean water Brush clean, but if there is still acid residue below, it will bring more significant corrosion to the steel structure.

3 This is a new method of derusting, which has not been used for a long time and has a low effect. Moreover, the rust removal efficiency is the worst in the secondary table, and the foundation has been eliminated.

6、 Painting of anti-corrosion paint for steel structure before derusting

6.1 When the primer is sprayed, the first coat of paint is generally red lead antirust paint. Before painting or spraying, the viscosity of red lead paint must be controlled to make the color and viscosity of paint uniform.

6.2 In the process of primer painting or spraying, attention should be paid to the construction process of lazy dipping and under brushing. If too much paint is carried with rotary variable brush, the scene of extravagance will be made.

6.3 When painting or spraying for the second time, it is necessary to wait until the first time of rheumatism before brushing the second layer. Never apply the second layer after the first time is dry, which will cause wrinkles on the surface of steel structure and reduce the quality.

6.4 In some cases, before the second drying, pay attention to the main second layer, anti-corrosion, which will make the average film thickness difference.

6.5 Only when the primer is applied 5-7 times, can we determine which ability can reach the surface drying, and the topcoat should not be applied before the surface drying.

7、 The applicable process for spot painting of anti-corrosion paint for steel structure is as follows:

7.1 The distance between the two ends of the top paint for steel structure anti-corrosion paint is relatively less. Before the primer is applied, it is still possible to apply the anti-corrosion paint for steel structure, but the consequences will be discounted. Therefore, we must find a shop with low price and efficient products.

7.3 Steel structure anti-corrosion paint, when the top coat is applied, the paint should be stirred continuously, and the brushing method and circular direction are the same as the following process.

7.4 The principle of coating and unloading of anti-corrosion paint for steel structure is as follows: adjusting the flow speed difference nozzle, rubber hose calibration gun, the hose can be pushed freely to the working area, and the air pressure of air compressor should be 0.5 ~ 0.8n/mm2.

7.5 When spraying anti-corrosive paint for steel structure, the interval between spray gun and coating should be maintained. Generally, the interval between spray gun and operation point should be 120mm. The coating sprayed by nozzle should be in the name of the building every day. Only in this way can we ensure sufficient painting results.

8、 Quality inspection standard for construction quantity of anti-corrosive paint for steel structure

1Review on anti-corrosive paint coating of steel structure:

1.1 The steel structure anti-corrosion paint shall be prior to the construction when the steel structure surface coating is stopped. The steel structure that has been painted shall be maintained to avoid dust or some pure substance again when the paint is wet.

1.2 Steel structure anti-corrosion paint coating before the disposal review, to ensure that the painted decoration layer color difference, no bubble, bright color.

1.3 The theoretical thickness of coating film of anti-corrosion paint for steel structure should be different from the standard of engineering request. The anti-corrosion paint should not be too thick or too thick, too thick has no bad anti-corrosion effect, too thick will lead to waste of capital.

2Quality inspection and issuance standard of anti-corrosion paint for steel structure

2.1 All kinds, models and quality of anti-corrosion paint used for steel structure construction must comply with the national regulations and requirements of hidden and irrelevant standards.

2.2 Before painting of steel structure anti-corrosion paint engineering, the derusting process of all steel surface to be constructed shall be carried out in accordance with the national hidden and irrelevant standards and regulations, and any pure quality and burr shall be avoided on the steel surface after rust treatment.

2.3 In the process of anti-corrosion paint for steel structure, there should be no false coating or missing coating, and the anti-corrosion paint coating of steel structure should avoid any hidden phenomenon of skin penetration and rust return.

Scheme 3: anti corrosion construction scheme of steel structure

1、 Preparation basis:

1Construction contract and Party A’s technical requirements;

2Rust grades and derusting grades of steel surfaces before painting (GB / t8923-88);

3Code for construction and acceptance of corrosion protection engineering of industrial equipment and pipeline (hgj229-91);

4″Safety regulations for painting operation, safety of coating pretreatment process” (gb7692-87);

5Other relevant national anti-corrosion construction technical specifications and standards;

6The existing technical equipment of our company and the construction experience and data of similar projects accumulated for many years.

2、 Construction preparation:

1Material preparation:

1.1 All kinds of materials meeting the needs of the project shall be purchased from the material supplier, and their performance shall meet the requirements of Party A, relevant standards and specifications.

1.2 All kinds of anti-corrosive coatings shall be provided with written quality certificates, quality inspection reports or product instructions.

1.3 After the raw materials are transported to the construction site, they shall be submitted to the quality management personnel of Party A for acceptance, and can be used in the project after being approved.

1.4 If you have doubts about the material of some materials, you can take samples to the local authority department for secondary test and identification.

2Personnel preparation:

2.1  An experienced construction manager of our company, as the project manager to be responsible for the overall work of the project;

2.2 Appoint an engineer to be responsible for the technical work of the project;

2.3 One safety officer and one quality inspector shall be appointed to be responsible for the safety and quality inspection of the project;

2.4 A total of 20 skilled derusting and anti-corrosion workers were assigned to participate in the construction.

3Preparation of construction equipment:

In advance of the commencement of the project, all kinds of construction equipment to be put into the project shall enter the site, and the construction equipment shall operate normally.The constructors to be put into the project include: agitator, angle grinder, etc.

3、 Construction process flow:

Construction preparation — surface treatment — Inspection qualified — primer coating once — drying and inspection qualified — additional primer coating for one time — drying and inspection qualified — coating intermediate paint once — drying and inspection qualified — coating one coat of top coat — drying and inspection qualified — adding one coat of topcoat — drying and inspection — acceptance and handover.

4、 The main construction methods of divisional and sub-divisional works are as follows:

1Surface treatment:

1.1 Before anti-corrosion of metal surface, derusting shall be carried out by combining power tools and manual derusting. After derusting, the metal expression surface shall meet the ST3 standard specified in “rust grades and derusting grades of steel surfaces before painting” (GB / t8923-88); the back corners that are not easy to be cleaned shall also meet ST2 standard.

ST3: it means that the treated rusted surface should show metallic luster.

ST2: it means that the treated rusted surface has no visible ash, water, oil, dirt, and weathered oxide scale, rust layer and paint.

1.2 Power tools and manual derusting:

Steel wire brush, shovel, sandpaper and grinding wheel net are used to remove the rust, oxide scale, old paint film and other attachments on the metal surface.

1.3 The derusting procedure should be operated in the top-down construction sequence.

1.4 After derusting the metal surface, the coating can be applied only after the site supervision engineer of Party A is qualified and the concealed work record is handled.

2Preparation of coating:

2.1 Before the preparation of the coating, it should be mixed evenly. If there are crusts or other impurities, it must be removed before use.After the paint is opened, it must be sealed and stored.

2.2 The prepared coating shall be fully stirred and applied; the coating preparation shall be determined according to the area to be coated and the film thickness.

2.3 When preparing the coating, the viscosity should be controlled, and it should not be too thin or too thick.When adjusting the viscosity, the special thinner for the paint to be adjusted shall be used; it is not allowed to use it arbitrarily.The tools used for coating preparation shall be kept clean and shall not be mixed.

3Coating method:

Roll coating and brush coating are used for construction. Roll coating is used for large area construction and brush coating is used for small components. Reasonable coating method is selected according to site conditions.

4Coating:

4.1 Before coating, clean brush and cotton gauze will wipe the metal surface clean.

4.2 Roll coating construction:

4.2.1 When rolling coating, it is necessary to adopt the method of combining rolling and brushing, and brush the parts that are not easy or can not be painted with brush.In order to ensure that there is no missing coating. When painting different kinds of paint, the brushing tools shall not be mixed.

4.2.2 During roll coating, the layers should be crisscross, and each layer should be reciprocating to meet the design requirements of the number of layers and thickness.

4.3 Brush coating construction:

When brushing, the brush should not be immersed in the coating too much, generally 1 / 2 is appropriate. When brushing, the force should not be too large, and the number of brushing back should not be too much. When brushing, it should be crisscross and crisscross, which can increase the mutual adhesion of each coating layer and supplement the deficiency of each other.

4.4 Coating shall be carried out from top to bottom and from inside to outside.After each coating is finished, the next coating shall be applied after curing, and the interval time shall not be too long.

4.5 In order to ensure the thickness of coating film, the amount of coating can be controlled, that is, a certain amount of coating is used in a certain area.

4.6 After the completion of the coating surface, the film thickness must be uniform and smooth, the surface is free of dust and sagging and other defects, if any, it needs to be repaired.

4.7 During the construction, the coating interval of each paint shall be strictly in accordance with the coating product instructions provided by the manufacturer, and the next coating shall be applied after the surface of the previous paint is dry.

4.8 In order to ensure that the color of paint film meets the design requirements, trial coating shall be carried out before painting the top coat, and the overall coating shall be carried out when the color of paint film reaches the design standard.In order to make the overall color consistent without color difference, the top coat should be uniformly adopted with the same manufacturer and the same batch number of paint.

4.9 When brushing, the force should not be too large, and the number of back brushing should not be too much. When brushing, it should be crisscross and crisscross, which can increase the mutual adhesion of each coating layer and supplement the deficiency of each other.

4.10 During construction, the construction sequence shall be from top to bottom, and the last finishing coat shall be applied in the smooth direction.During coating, careful operation shall be carried out to achieve uniform and uniform coating without defects such as missed coating, blistering, discoloration and loss of gloss.

4.11 After the surface of each coating is dry, the coating construction of the next coating can be carried out after passing the acceptance of the management personnel of Party A and handling the concealment record.

5、 Construction environment and precautions:

1The construction environment temperature is 10-30 ℃, the relative humidity is not more than 85%, and the steel surface temperature is at least 3 ℃ higher than the dew point temperature.

2In rainy and foggy days or when the ambient humidity is more than 85%, the wind force is not more than grade 5, and the metal surface temperature is lower than 3 ℃ above the dew point, the painting operation shall not be carried out.

3The coating film shall be free from quality defects such as missed coating, sagging, color penetration, pinhole, orange peel, blistering, etc., and the thickness of the film shall be consistent; the color shall be uniform, and the finish coat shall be free from color difference, slag inclusion and dust.

6、 Quality inspection:

Quality inspection always runs through the whole construction process. After each process is completed, the next process can be carried out after the acceptance of Party A’s management personnel and the record of concealed works is handled.And meet the following standard requirements:

1Surface treatment inspection:

After mechanical derusting, the metal surface shall meet the ST2 or ST3 standards specified in GB / t8923-88 “rust grades and derusting grades of steel surfaces before coating”.

ST2: thoroughly remove rust by hand and power tools. The steel surface shall be free of visible grease and dirt, and there shall be no attachment such as oxide scale, rust and paint coating which are not firmly attached. 

ST3: very thorough manual and power tool derusting. The steel surface should be free of visible grease and dirt, and there should be no adhering objects such as oxide scale, rust and paint coating.Rust removal should be more thorough than ST2, and the surface of exposed part of substrate should have metallic luster. 

2Coating anti-corrosion coating:

2.1 Appearance inspection: the coating should be smooth and flat, with the same color, without pinhole, bubble, peeling and other defects. Use a 5-10 times magnifying glass to check, and those without micropores are qualified.

2.2 Inspection of coating thickness: the thickness of coating shall be uniform, and the thickness and number of layers shall meet the design requirements.

2.3 Adhesion inspection: the coating adhesion shall be checked by crossing method.

7、 Safety construction technical measures:

1Before construction, the workers and management personnel participating in the project construction must carry out construction safety technology education, and always adhere to the safety policy of “safety first, prevention first”.

2Set up professional safety officers to be responsible for the supervision and inspection of construction safety.We should ensure strong security.

3Each power switch shall be equipped with leakage safety protection transport switch. The lighting device shall be protected by protective cover to prevent fire caused by broken bulb. The voltage shall not be higher than 24 v. the light wire must be leather wire without leakage.For electrical equipment used in inflammable and explosive environment, lighting and switch should be explosion-proof type. All electrical tools must be turned off and power supply cut off after using or not operating.

4When working at a height of more than 2 meters, safety helmet and safety belt shall be worn. High altitude operation is strictly prohibited for people with high or low blood pressure, amblyopia, deafness, flat foot and other health abnormalities.

5Personnel engaged in engineering construction shall be equipped with necessary labor protection articles, such as work clothes, work shoes, gloves, caps, masks, etc.

6The materials of anti-corrosive paint are flammable materials, and most of the solvents are toxic and flammable liquids. The volatilized gas can be mixed with air to become explosive gas. Therefore, a special warehouse should be set up on the site, and the material warehouse should be able to ventilate and be equipped with fire-fighting equipment.

7The anti-corrosive paint materials should be sealed and stored. The warehouse should be cool and dry. The temperature should be 10 ℃, but not lower than 0 ℃.Natural ventilation or mechanical ventilation should be available in summer.

8Pay attention to fire prevention at the construction site. Smoking and use of open fire equipment such as electric furnace are strictly prohibited.

9When temporary power supply is needed in the process of anti-corrosion construction, the application for temporary power supply shall be submitted. The location of construction site and the total capacity of construction electricity shall be reported to the construction unit, and the electrical engineer shall be responsible for the connection and installation.In the construction power area of the anti-corrosion site, the forbidden area shall be marked out, and the fence and hanging board shall be set for warning.

10During the anti-corrosion construction, check whether the electrical devices and protection facilities are in good condition; it is forbidden to operate the equipment with “disease”.The out of service equipment must be switched off, and the switch box must be locked; if any problem is found, it should be reported and solved in time; when moving or moving the electrical equipment, the power supply must be cut off by the electrician and proper treatment should be made.

11Temporary power engineering on construction site shall be inspected once a week; unsafe factors must be dealt with in time; and recheck and acceptance procedures shall be performed.Attention should be paid to fire prevention and electric shock prevention in living area and construction site.