JP5077960B2 - Method for forming coating film on outdoor steel structure - Google Patents

Description

  The present invention relates to a method for forming a coating film on an outdoor steel structure, and is particularly useful when applied to diagnose and repaint a coating film and an undercoat base material coated on an outdoor steel structure.

  The exterior walls of various structures installed outdoors are not only an aesthetic point of view, but in the case of metal structures such as oil tanks, painting is an important role from the viewpoint of protecting the exterior wall materials. Plays. The coating film applied to the outer wall deteriorates over time. As a result, not only the aesthetics of the structure are impaired, but also the base metal of the structure is corroded by the penetration of the corrosion factor through the coating film, and the coating peels off as the corrosion further proceeds. If this condition is left unattended, not only will it cause aesthetic problems, but it will also shorten the life of the structure, so it is necessary to repair and repaint before the deterioration of the coating film and the substrate under the coating progresses. There is.

  On the other hand, it is difficult to judge whether or not the coating film needs to be repaired or repainted, and it has often been necessary to consult an experienced painter. Therefore, there is a technique for evaluating the deterioration state of the coating film by image processing the image data obtained by imaging the coating surface of the structure, and outputting a diagnosis result obtained from the deterioration state (for example, Patent Documents). 1). According to such a technique, since the deterioration state is evaluated according to a predetermined evaluation criterion, diagnosis can be performed without variation.

  Further, the diagnosis of the deterioration state of the coating film by the technique as described above is based on the ratio of the total area of the peeling and rust portions of the coating film surface to the predetermined reference area of the structure. That is, one piece of image data is obtained from the structure, and the deterioration state of the coating film is diagnosed based on the ratio of the peeled portion or the like in the image data.

  Here, the coating film of the structure disposed outdoors is not actually deteriorated under uniform conditions as a whole. For example, the structure includes a portion where rainwater is likely to hit, a portion where water is likely to accumulate, a portion which is easily exposed to direct sunlight and deteriorates, and the environmental conditions are different for each portion. In addition, non-uniform degradation may occur in the structure due to non-uniformity of the original substrate. For these reasons, the entire surface of the structure is hardly deteriorated uniformly.

  The above-described technique has a problem that accurate diagnosis of each part cannot be performed because the entire structure is imaged and diagnosed with one image data. For example, there is a case where a diagnosis that the coating film is good overall is made despite partial repair.

  In addition, even if it looks sound to the outside, sometimes it appears to be healthy, such as a thick-film epoxy resin paint or a vinyl ester resin-based paint containing glass flakes. Deterioration may have begun. In such a case, if only the diagnosis based on the image data is performed, such deterioration cannot be found, and the deterioration proceeds under the coating film. As a result, the strength of the structure is reduced, which may be a dangerous situation.

  Furthermore, if an inappropriate coating film diagnosis is performed, and repair and repainting are performed, re-deterioration is caused, resulting in unnecessary costs.

JP 2005-283519 A

  In view of such circumstances, the present invention accurately diagnoses the state of the coating film and the base material of the outdoor steel structure, and can appropriately repair or repaint the deteriorated portion. An object is to provide a forming method.

  In order to achieve the above object, the first aspect of the present invention is the state of the coating film and the substrate under the coating for each of a plurality of diagnostic areas which are obtained by dividing the area where the coating film of the outdoor steel structure is provided. The first step of obtaining a survey result, which is a numerical value of the state of the coating film and the base material of the coating film, and a deterioration state of the coating film and the base material of the coating film, by performing a plurality of survey means for quantifying A second step of determining, for each of the diagnostic areas, the determination of the deterioration state for each of the inspection means based on whether or not the inspection results meet a determination criterion for determination; A comprehensive point that is obtained by multiplying the deterioration state of each means by a predetermined weighting coefficient and adding the calculated weights is calculated, and based on whether the total point exceeds a predetermined threshold value, the coating film and the coating in the diagnostic region are calculated. Comprehensive representation of the degradation state of the submembrane substrate The third step of calculating the constant value and the diagnosis area that has been deteriorated to the extent that repair is required due to the comprehensive determination, base coating is applied, and the diagnosis area or outdoor steel is applied. A method for forming a coating film on an outdoor steel structure, comprising: a fourth step of applying a top coating to the entire region where the coating film of the structure is provided.

  In such a first aspect, by dividing into a plurality of diagnosis areas, it is possible to carry out investigation means suitable for each diagnosis area, so the installation location of the outdoor steel structure, the positional relationship with other structures, etc. The deterioration state of the coating film and the substrate under the coating film can be accurately diagnosed without being influenced by the above factors. And since it paints to a diagnostic area | region from the comprehensive determination based on this degradation state, the degraded location can be repaired appropriately. In particular, the coating on the outer wall surface and the substrate under the coating are good overall, but it is useful when a certain diagnostic area is deteriorated.

  According to a second aspect of the present invention, in the method for forming a coating film on an outdoor steel structure according to the first aspect, the plurality of investigating units are configured to visually check a deteriorated area ratio, which is a ratio of a deteriorated area in a diagnostic region. From the group consisting of measurement by measurement, analysis by image processing of the deterioration area ratio, electrochemical measurement by a metal corrosion diagnostic apparatus under coating film, chemical analysis of coating film, film thickness measurement of coating film, and adhesion measurement of coating film The present invention resides in a method for forming a coating film on an outdoor steel structure, which is at least two or more selected.

  In the second embodiment, the state of the coating film can be investigated from the optical, electrochemical, and mechanical viewpoints.

  According to a third aspect of the present invention, in the method for forming a coating film of an outdoor steel structure described in the first or second aspect, in the fourth step, the comprehensive judgment is deteriorated to the extent that repair is required. The base area is adjusted for the diagnosis area, and the undercoat paint is applied. Then, the intermediate coat paint is applied to the entire area where the coating film of the outdoor steel structure is provided, and the top coat paint is applied. It is in the coating film formation method of the outdoor steel structure characterized.

  In the third aspect, by applying the intermediate coating, it is possible to improve the adhesion of the top coating to the base coating portion and the portion where the base coating is not applied, and to improve the hiding power and smoothness of the top coating. .

  According to a fourth aspect of the present invention, in the method for forming a coating film of an outdoor steel structure according to any one of the first to third aspects, in the fourth step, the repair is required by the comprehensive determination. After adjusting the base for the diagnosis area that has been deteriorated to the surface, surface the diagnosis area other than the diagnosis area that has been subjected to the base adjustment, and paint the base coat on the part that has been subjected to the base adjustment The method for forming a coating film on an outdoor steel structure is characterized in that an intermediate coating is applied to the entire area where the coating film of the outdoor steel structure is provided and a top coating is applied.

  In the fourth aspect, the adhesion of the intermediate coating material to the old coating film can be further improved.

  The undercoat paint in the first, third, and fourth aspects of the present invention may be applied a plurality of times in order to give a necessary film thickness.

  According to a fifth aspect of the present invention, in the coating method for coating an outdoor steel structure according to any one of the first to fourth aspects, the outdoor steel structure includes a tank, a bridge, a power transmission tower, a ship, and The coating film forming method for an outdoor steel structure is characterized in that it is at least one selected from the group consisting of steel frames for construction.

  In the fifth aspect, it is possible to satisfactorily repaint and repair tanks, bridges, power transmission towers, ships, and construction steel frames.

  According to the present invention, there is provided an outdoor steel structure coating film forming method capable of accurately diagnosing the state of an outdoor steel structure coating film and an undercoat film substrate, and appropriately repairing and repainting a deteriorated portion. Provided.

  Hereinafter, the best mode for carrying out the present invention will be described. The description of the present embodiment is an exemplification, and the present invention is not limited to the following description.

<Embodiment 1>
FIG. 1 is a diagram illustrating a flow of a method for forming a coating film on an outdoor steel structure according to the first embodiment.
As shown in FIG. 1, first, a plurality of investigations for quantifying the state of the coating film and the substrate under the coating film for each of a plurality of diagnosis areas that are obtained by dividing the area where the coating film of the outdoor steel structure is provided. The means is implemented and the survey result is acquired (step S1).

  An outdoor steel structure refers to a structure that is installed outdoors and the coated portion to which a coating film is applied is made of steel. Moreover, the steel here includes low alloy steels such as weather resistant steel. FIG. 2 is a schematic view of a storage tank which is an example of an outdoor steel structure according to the present embodiment. As shown in the figure, the storage tank 1 is formed in a columnar shape, and a coating film is formed on its outer wall surface by painting. A diagnosis area is determined on the outer wall surface of the storage tank 1. The diagnosis region is a region obtained by dividing the region of the storage tank 1 where the coating film is provided. In the present embodiment, the storage tank 1 is divided into nine diagnosis areas, and numbers “1” to “9” are assigned to the diagnosis areas.

  The investigation means quantifies the state of the coating film of the outdoor steel structure and the substrate under the coating film, and this numerical value is referred to as the investigation result. Quantifying the state of the coating means various properties of the coating such as physical properties such as peeling, blistering, rust, coating thickness, coating composition, adhesion, It refers to obtaining measured values of electrical properties such as capacitance, and quantifying the state of the substrate under the coating means obtaining measured values of electrochemical properties such as polarization resistance or polarization capacity at the interface between the coating and the substrate. . The investigation means is not particularly limited as long as the degree of the state of the coating film and the substrate under the coating film can be quantified. For example, the following investigation means can be used.

(1) Visual inspection: A painter visually examines a rusty portion, a blistered portion or a peeled portion of the coating film, and estimates the ratio of the total area of these portions to the area of the diagnostic region. This ratio is called the deterioration area rate.
(2) Image processing analysis: For example, the storage tank 1 is imaged by an imaging means such as a digital camera, and the image data of the storage tank obtained thereby is processed by the information processing device to calculate the deterioration area ratio.
(3) Under-coating corrosion measurement: Using a corrosion diagnostic apparatus, data on the coating area resistance, coating film capacity, polarization resistance of the under-coating substrate, and polarization capacity of the under-coating substrate is obtained. As the corrosion diagnosis apparatus, for example, an undercoat corrosion measurement apparatus as described in Japanese Patent No. 3051153 is used. From these data, the deterioration condition of the coating film and the corrosion condition of the substrate under the coating film can be understood.
(4) Chemical analysis of the coating film: A coating history is obtained by observing the cross section of the coating film in the diagnostic region. The painting history is the type and number of times of the coating film. Moreover, the resin system of a coating film is specified by FT-IR (infrared absorption spectrum method).
(5) Film thickness measurement of coating film: The film thickness of the coating film is measured using an electromagnetic film thickness measuring instrument.
(6) Adhesion investigation of coating film: Adhesion is investigated by adhesion tester (method according to JIS K 5600-5-7) or cross-cut test (method according to JIS K 5600-5-6).

  A plurality of such investigation means are implemented for each diagnosis area, and the investigation results are acquired. Note that it is not always necessary to carry out all of the investigation means (1) to (6) for all diagnosis areas, and at least two or more investigation means may be carried out for each diagnosis area. .

  Returning to FIG. 1, next, the deterioration state for each investigation means is determined for each diagnostic region based on whether or not the investigation result is compatible with the determination criterion for determining the deterioration state of the coating film and the substrate under the coating film ( Step S2).

  Degraded state is information indicating whether the coating film has deteriorated enough to require repair or re-repair due to rust or peeling, and the criterion is the coating film defined for the survey results. This refers to the correspondence between the deterioration state and the survey results. Determining the deterioration state based on whether or not the investigation result matches the determination criterion means deriving the deterioration state corresponding to the investigation result from the determination criterion.

  For example, as a criterion for visual inspection of the investigation means (1), there can be cited a correspondence between the investigation result “deterioration area ratio is 15% or more” and the deterioration state “1 (deteriorated)”. . Such a criterion is determined for each investigation means. And, if the result of the actual visual inspection is “deterioration area ratio 20%”, it corresponds to the above-mentioned criterion. Will be judged).

  This is performed for each investigation means that has performed such a deterioration state determination. That is, if six investigation means are implemented for one diagnostic region, six deterioration states can be obtained. Then, this deterioration state determination is performed for all diagnosis regions.

  The deterioration state may be a binary value of “1 (deteriorated state)” and “0 (non-deteriorated state)”, or “0.8 (slightly deteriorated state)” or “0. It may be a plurality of stages such as “3 (a state that is not deteriorated so much)”. In addition, as a determination criterion, for example, the deterioration state may be determined based on whether or not the investigation result exceeds a certain threshold, or the deterioration state depends on whether or not the investigation result belongs to a certain numerical range. May be determined.

  Next, for each diagnosis region, a deterioration point for each investigation means is multiplied by a predetermined weighting factor and added to calculate a total point. Based on whether the total point exceeds a predetermined threshold Then, a comprehensive determination representing the deterioration state of the coating film in the diagnostic region and the substrate under the coating film is calculated (step S3).

  More specifically, each deterioration state determined in the second step is multiplied by a predetermined weighting coefficient, and these are added to calculate a total score. When the total score exceeds a predetermined threshold, the comprehensive determination is “diagnostic region is deteriorated”, and when the total point is not exceeded, the comprehensive determination is “diagnostic region is not deteriorated”. That is, in the second step, the deterioration state for each investigation means is determined, but in the third step, the overall deterioration state of the coating film and the substrate under the coating film in the diagnosis region is determined.

  The predetermined threshold value is not limited to one, and a plurality of threshold values may be set. For example, the threshold value is used so that “the deterioration level is large when the total score exceeds 2”, “the deterioration level is medium when the total score exceeds 1 and 2 or less”, and “no deterioration is generated when the total score is 1 or less”. Also good.

  Next, the substrate is adjusted for the diagnosis area that has been deteriorated to the extent that repair is required by comprehensive judgment, the undercoat paint is applied, and the entire storage tank 1 is applied with the overcoat paint (step S4). . At this time, surface finishing and intermediate coating are performed as necessary.

  Substrate adjustment refers to a process of removing the old paint film so that the steel surface of the storage tank 1 appears prior to painting, or removing deposits on the old paint film. After preparing the substrate, apply a primer to the diagnostic area. As the undercoat paint, a paint having rust prevention and high adhesion to steel is used. Thereby, the steel surface of the storage tank 1 can be protected from rust.

  Thereafter, the entire storage tank 1 is painted with a top coat. As a result, the color tone does not differ at the boundary between the diagnosis area subjected to the substrate adjustment and the other diagnosis areas, and the aesthetic appearance of the storage tank 1 can be maintained. In addition, as the top coating material, a coating material having weather resistance is used. Thereby, a protective function can be maintained over a long period of time.

  Further, the surface is applied to a region where a coating film other than the undercoat paint coating portion is provided, that is, a diagnostic region other than the diagnostic region where the substrate adjustment is performed. Examples of the surface treatment method include a method using a wire brush, sandpaper, and steel scrubber. Thereby, the adhesiveness of the top-coat paint with respect to an old coating film improves.

  In addition, after the undercoat paint is applied, the intermediate coat paint may be applied to the entire area where the paint film is provided, that is, the entire area where the paint film of the storage tank 1 is provided, and then the top coat paint may be applied. This intermediate coating can further improve the adhesion between the undercoat or the old coating and the top coating.

  In addition, spray coating is preferable as a method for applying the undercoat paint, the intermediate coat paint, and the top coat paint, but is not particularly limited. For example, when the diagnosis area is a narrow area, painting by brush or roller can be used.

  Hereinafter, the specific example of the coating-film formation method of the outdoor steel structure demonstrated above is shown. Table 1 shows the survey results obtained by performing the first step.

[Table 1]

  As shown in Table 1, for each diagnosis area, “visually deteriorated area rate” (obtained by the investigation means (1)) and “deterioration area ratio by image processing” (obtained by the investigation means (2)). ), “Polarization resistance” (obtained by the under-coating corrosion measurement of the investigation means (3)), “adhesion” (obtained by the adhesion investigation of the coating film of the investigation means (6)) ) And “film thickness” (obtained by measuring the film thickness of the coating film of the investigation means (5)).

  As indicated by the blanks in Table 1, it is not always necessary to carry out all investigation means in all diagnosis areas.

  Next, the second step is performed. Table 2 shows criteria for determining the deterioration state.

[Table 2]

  As shown in Table 2, a determination criterion is set for each investigation means. For example, in the case of “visually deteriorated area ratio”, if the result of the investigation is “15% or more”, the coating film in the diagnostic region targeted by the investigation means is judged to be “deteriorated”. .

  Based on whether or not the investigation results in Table 1 conform to the determination criteria in Table 2, the deterioration state for each investigation means is determined for each diagnostic region. Table 3 shows a deterioration state for each investigation means in each diagnosis area. In the table, the deterioration state “1” means that the deterioration has occurred, and “0” means that the deterioration has not occurred.

[Table 3]

Next, the third step is performed. Here, “deterioration state obtained from visual degradation area ratio” is X ₁ , “degradation state obtained from degradation area ratio by image processing” is X ₂ , and “degradation state obtained from polarization resistance” is X _{3. If} the “degraded state obtained from adhesion” is X ₄ and the “degraded state obtained from film thickness” is X ₅ , the total point Y is obtained by the following equation. In the following formulas, a to e are predetermined weighting coefficients.

Here, in order to increase the specific gravity with respect to the deterioration area ratio and the polarization resistance by visual and image processing, the predetermined weighting coefficients are “2 for a, b and c” and “1 for d and e”. As a result, the overall point Y ₁ ~Y ₉ of each diagnostic area "1" to "9" is as follows.

A plurality of threshold values t _{0 to} t ₂ are used as predetermined threshold values for calculating a comprehensive determination from these total points Y _{1 to} Y ₉ . That is, if the overall score is 0 or more and less than t ₀ , the overall judgment is “sound”, if t ₀ or more and less than t ₁ , the overall judgment is “low degradation”, and if t ₁ or more and less than t ₂ The overall judgment is “medium degradation level”, and if it is t ₂ or more, the overall judgment is “high degradation level”. t ₀ was “1.5”, t ₁ was “3”, and t ₂ was “4.5”.

Table 4 shows the comprehensive determination calculated from Y ₁ to Y ₉ based on these threshold values. As shown in the table, the diagnosis areas “1”, “2”, and “9” are deteriorated.

[Table 4]

  Note that the predetermined weighting coefficient may be determined according to the type of coating applied to the diagnostic region. For example, in a weak coating film such as an alkyd system, deterioration such as rust is likely to occur on the surface, and therefore a coefficient related to the deterioration area ratio is set large. On the other hand, in a strong coating film such as an epoxy system or a thick coating system, the surface does not deteriorate, and peeling may proceed under the coating film, so the coefficient related to polarization resistance is set large. Thereby, an appropriate comprehensive determination can be made according to the coating film.

  Next, the fourth step is performed. That is, the diagnosis area “1” determined as “high deterioration degree” in the comprehensive determination, the diagnosis area “2” determined as “low deterioration degree” in the comprehensive determination, and the diagnosis determined as “medium deterioration degree”. For the area “9”, the base is adjusted, the undercoat paint is applied to the diagnosis area where the base is adjusted, and the surface area is applied to the other diagnosis areas. The top coat paint is applied. Tables 5 to 10 illustrate coating systems.

[Table 5] Paint system 1

[Table 6] Paint system 2

[Table 7] Paint system 3

[Table 8] Paint system 4

[Table 9] Paint system 5

[Table 10] Paint system 6

  When selecting the coating system to be applied to the diagnosis area from the exemplified coating systems, depending on the coating system of the already painted coating film (old coating film) and the type of substrate adjustment, “Japan Steel Association” Refer to the “Handbook of road bridge painting” and “Handbook of steel road bridge painting / corrosion prevention”. In addition, the coating system of an old coating film can be known by the chemical analysis of the coating film of the said investigation means (4).

  As shown in Table 11, the base adjustment types are classified into four types depending on the work contents and work methods.

[Table 11]

  These substrate adjustments are selected according to the degree of deterioration of the coating film in the diagnostic region. That is, the type of substrate adjustment to be applied is determined based on the comprehensive determination calculated in the third step. Table 12 illustrates the correspondence between the comprehensive determination and the type of substrate adjustment.

[Table 12]

  As shown in Table 4, the diagnosis area “1” corresponds to “1 type” or “2 types” of the substrate adjustment shown in Table 12 because the comprehensive judgment calculated in the third step was “high degree of degradation”. In the diagnosis area “9”, since the overall judgment is “medium degree of deterioration”, the base adjustment “3 types” corresponds, and the diagnosis area “2” has “low degree of deterioration”. "4 types" correspond.

  Accordingly, the base areas suitable for the diagnostic areas “1”, “9”, and “2” are respectively adjusted, and the entire surface of the other diagnostic areas is subjected to surface adjustment, and then the diagnostic areas “1”, “9”, “2” After the undercoat is applied, the intermediate coat and top coat are applied to the entire surface.

  According to such a coating method for outdoor steel structures, the rust and old coating film is removed by adjusting the substrate in the diagnostic area where repair is required, and a coating film having rust prevention and weather resistance is formed. Therefore, the steel surface which is the outer wall material of the storage tank 1 is protected. Since the same intermediate coating and top coating are applied to the entire storage tank 1, the color tone of the diagnostic area does not differ from the color tone of the entire storage tank 1, and the aesthetic appearance of the storage tank 1 is maintained.

  In the method for forming a coating film of an outdoor steel structure according to the present invention, the outer wall surface of the storage tank 1 to be diagnosed is divided into diagnostic areas, and a survey means is performed for each diagnostic area to obtain a survey result. The deterioration state of the coating film in the diagnosis region is determined depending on whether or not the determination criteria are met, a comprehensive determination is calculated for each diagnosis region from the deterioration state, and the storage tank 1 is used using a coating system based on the comprehensive determination. Repaint and repair.

  On the other hand, since the environmental conditions differ from part to part, the structure may be partially degraded even if it is a good overall film. Even in such a case, since the deterioration state of the coating film in the diagnostic area and the base material under the coating area that distinguishes the outer wall surface of the structure is judged, the deterioration state without missing the rust or peeling partially coated film Can be determined. Incidentally, for example, when image data obtained by imaging the entire outer wall surface of the storage tank 1 with a digital camera is subjected to image processing to obtain a deteriorated area rate, it is determined that the entire outer wall surface is good even if a deteriorated portion exists. However, this is not the case with the method for forming a coating film on an outdoor steel structure according to the present invention.

  Moreover, the comprehensive judgment of each diagnostic area | region was computed from the investigation result obtained by implementing several investigation means in each diagnostic area | region. Thus, for example, even if a certain investigation means is difficult to implement due to the location of the structure, the positional relationship with other structures, and the shape of the structure, other investigation means should be implemented. Thus, the investigation result of the diagnosis area can be acquired and the deterioration state can be determined. For example, since there is a shield in front of the diagnostic area “4” and “7” of the storage tank 1, the diagnostic area is electrochemically measured like under-coating corrosion measurement even though it is difficult to investigate with a digital camera. If it is possible to investigate easily by means of coating film diagnosis. In short, since the coating method of the outdoor steel structure according to the present embodiment is divided into a plurality of diagnosis areas, it is possible to carry out investigation means suitable for each diagnosis area. It has the flexibility to determine the state of deterioration of the coating film without being influenced by factors such as the positional relationship with other structures, and to perform appropriate coating.

<Embodiment 2>
In the first embodiment, the coating system is selected based on the coating system of the old coating film and the type of substrate adjustment. However, the present invention is not limited to this, and the coating system may be selected using various criteria. . Such criteria include the nature of the paint used for the new painting and the type of painting process. In this way, if the coating system can be selected according to various standards, it is possible to flexibly respond to the customer's desire for painting.

  Table 13 shows the types of substrate adjustment and the coating system of the old paint film, "type of old paint film already painted in the past", "whether the same paint as the old paint film is repaired", "environment" “Whether it is a corresponding coating”, “Whether it is a paint process with a reduced process”, and “Whether it is a highly durable coating”, and illustrate a coating system corresponding to these.

[Table 13]

  As shown in Table 13, there are “phthalic acid type” and “chlorinated rubber type” as the coating system of the old coating film. Similarly, "Whether the same coating as the old paint film is repaired or not", "Whether it is an environmentally-friendly coating", "Whether it is a coating method with a reduced process" and "High durability coating" Whether or not is “o” or “x”. In addition, the notation such as “1-1-1” of the paint system is a number for specifying the paint system as exemplified in Tables 5 to 11.

  For example, as described in the first embodiment, since the overall judgment of a certain diagnosis region is “high degradation level”, the base adjustment type is “1 type”, and the coating system of the old paint film is “phthalic acid type” ”. For example, suppose that the customer does not desire the same repair as the old paint film, desires an environmentally-friendly paint, desires a paint-saving process, and desires a highly durable paint. In this case, the coating system specified by “1-1-7” is selected from Table 13.

  As described above, by selecting a coating system based on various criteria, it is possible to perform coating in consideration of the customer's request.

<Embodiment 3>
In the method for forming a coating film of an outdoor steel structure according to Embodiment 1 and Embodiment 2, it was divided into nine diagnostic areas, and the number, size, position, and shape were fixed, but it was limited to this. Instead, it may be changed according to the deterioration state.

  For example, first, the diagnosis area is divided into nine diagnosis areas (initial diagnosis areas), and respective deterioration area ratios are acquired. Then, the initial diagnosis region whose deterioration area rate is equal to or greater than a predetermined value is divided again. And about the diagnostic area | region after a re-segmentation, the 1st-4th process is performed similarly to Embodiment 1. FIG. The method of re-segmentation may be set as appropriate for the number, position, size, and shape, but in particular, the initial diagnosis area where the deterioration area rate is a predetermined value or more is classified more finely than other initial diagnosis areas. It is preferable. As a result, a fine diagnostic region is set for a portion where the degree of deterioration is large, and a large diagnostic region is set for a portion where the degree of deterioration is small. For this reason, places where the degree of deterioration is large are intensively investigated by each investigation means, and places where the degree of deterioration is small can be simply investigated. Thereby, the deterioration state of a coating film and a base material under a coating film can be judged accurately.

<Other embodiments>
In the first to third embodiments described above, the deterioration state or the like is determined for one investigation result obtained by performing the investigation means once in each diagnosis area. However, a plurality of investigation means are provided in each diagnosis area. The deterioration state or the like may be determined based on a plurality of survey results obtained by performing the test once. Table 14 exemplifies the investigation results obtained by carrying out the investigation means twice for the diagnosis region “1”.

[Table 14]

  In such a case, the deterioration state is calculated for each investigation result, and the total score is calculated from the deterioration state for each investigation result. Thereafter, for example, the average of the total points for each survey result is taken. Then, a comprehensive determination can be calculated based on whether this average exceeds a predetermined threshold.

  Moreover, although the cylindrical storage tank 1 was demonstrated to the example as a steel structure, of course, it is not limited to a storage tank, The coating-film formation method of the outdoor steel structure which concerns on this invention is a tank, a bridge, power transmission The present invention can be widely applied to various steel structures installed outdoors such as steel towers, ships and construction steel frames.

  In addition, you may implement | achieve the 1st process-the 3rd process of the coating-film formation method of the outdoor steel structure concerning this invention using a computer. That is, for each diagnosis area, each investigation means is executed and the investigation results shown in Table 1 are input to the computer and stored as electronic data in the computer. Then, the judgment criteria as shown in Table 2 are stored in advance in the computer, and the investigation result and the judgment criteria are compared and calculated, and the deterioration state for each research means as shown in Table 3 is judged. Next, as shown in Table 4, the computer is caused to calculate a total score from the deterioration state and a predetermined weighting coefficient, and to calculate a total determination from the total score and a predetermined threshold for each diagnosis area.

  Conventionally, even an experienced painter may have different criteria for judgment depending on the painter, and sometimes an objective judgment is not made. However, this kind of computer processing makes it possible to quickly make objective judgments that do not depend on the allegation of the painter, and furthermore, appropriate painting and repair can be performed in the diagnostic area based on the overall judgment. This makes it possible to perform painting work while maintaining a certain quality.

It is a figure which shows the flow of the coating-film formation method of the outdoor steel structure which concerns on Embodiment 1. FIG. It is a figure which illustrates the storage tank which is an example of the outdoor steel structure concerning Embodiment 1. FIG.

Explanation of symbols

1 Storage tank

Claims (5)

For each of a plurality of diagnosis areas, which are obtained by dividing the area where the coating film of the outdoor steel structure is provided, the coating film and the coating film by performing a plurality of investigation means for quantifying the state of the coating film and the substrate under the coating film A first step of obtaining a survey result obtained by quantifying the state of the substrate under the coating;
Secondly, the determination of the deterioration state for each of the investigation means is performed for each of the diagnostic areas based on whether or not the investigation result matches a determination criterion for determining the deterioration state of the coating film and the substrate under the coating film. Process,
For each diagnostic area, multiply the deterioration state for each of the investigation means by a predetermined weighting factor, calculate an overall point, and based on whether the overall point exceeds a predetermined threshold, A third step of calculating a comprehensive judgment representing the deterioration state of the coating film and the substrate under the coating in the diagnostic area;
The base area was adjusted for the diagnosis area that was judged to have deteriorated to the extent that repair was required by the comprehensive judgment, and a primer coating was applied, and a coating film for the diagnosis area or an outdoor steel structure was provided. A coating film forming method for an outdoor steel structure, comprising: a fourth step of applying a top coating to the entire region. In the coating method of the outdoor steel structure according to claim 1,
The plurality of investigation means include visual measurement of a deteriorated area rate, which is a ratio of a deteriorated area in a diagnostic region, analysis by image processing of the deteriorated area rate, electrochemical measurement by an undercoat metal corrosion diagnostic device, coating A method of forming a coating film on an outdoor steel structure, comprising at least two or more selected from the group consisting of chemical analysis of a film, measurement of a coating film thickness, and measurement of adhesion of a coating film. In the method of forming a coating film on an outdoor steel structure according to claim 1 or claim 2,
In the fourth step, the base area is adjusted for the diagnosis area which has been deteriorated to the extent that repair is required by the comprehensive determination, and after the undercoat paint is applied, the coating film of the outdoor steel structure is applied. A method for forming a coating film on an outdoor steel structure, characterized in that an intermediate coating is applied to the entire provided area and a top coating is applied. In the outdoor steel structure coating film forming method according to any one of claims 1 to 3,
In the fourth step, a base adjustment is performed on the diagnosis area that has been deteriorated to the extent that repair is required by the comprehensive determination, and a diagnosis area other than the diagnosis area on which the base adjustment has been performed is displayed. Then, after applying the undercoat paint to the part where the substrate has been adjusted, the outdoor paint is applied to the entire area where the coating film of the outdoor steel structure is provided, and then the overcoat paint is applied. A method for forming a coating film on a structure. In the outdoor steel structure coating film forming method according to any one of claims 1 to 4,
The outdoor steel structure is at least one selected from the group consisting of tanks, bridges, power transmission towers, ships, and construction steel frames.

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