CN115807489A - Fireproof building structure and its construction method - Google Patents

Abstract

The present disclosure relates to the technical field of building construction, in particular to a fireproof building structure and a fireproof coating construction method for the fireproof building structure. The fireproof building structure includes the building structure substrate and the composite fireproof coating covered on the building structure substrate; the composite fireproof coating includes the fireproof basic coating, the structural reinforcement layer and the fireproof repair coating, and some positions of the fireproof basic coating With a repair depression, the fire protection repair coating fills the repair depression, and the structural reinforcement layer is arranged at least partially in the repair depression and is located between the fire protection base coating and the fire protection repair coating, so that only the position with defects can be treated locally , does not need to be completely removed, the treatment area is small, and the thickness of the new coating required to be sprayed is also small, which greatly saves cost and time, and the structural reinforcement layer ensures the bonding strength between the new coating and the old coating, ensuring The overall strength of the treated composite protective coating and the stability during use are guaranteed.

Description

Fireproof building structure and its construction method

technical field

The present disclosure relates to the technical field of building construction, in particular to a fireproof building structure and a construction method thereof.

Background technique

Most of the building structures are coated with fireproof materials to improve the fire resistance of the material of the building structure, which can slow down the speed of flame spread in the extreme case of fire.

However, during the construction process of the building, during the stoppage and resumption of the project, the unfinished fireproof coating on the surface of the building structure will be damaged by rain erosion, high temperature deformation and other factors. Usually, the fireproof coating on the surface of the building structure is removed and repainted as a whole, but this will lead to further delays in the construction period and higher construction costs.

Contents of the invention

In order to solve the above technical problems or at least partly solve the above technical problems, the present disclosure provides a fireproof building structure and a construction method thereof.

In a first aspect, the present disclosure provides a fireproof building structure, which includes a building structure substrate and a composite fireproof coating coated on the building structure substrate;

The composite fireproof coating includes a fireproof base coating, a structural strengthening layer and a fireproof repair coating, and a part of the fireproof base coat has repair depressions, and the fire prevention repair coating is filled in the repair depressions, The structural reinforcement layer is disposed at least in part of the repair depression and between the fire-resistant base coat and the fire-resistant repair coat.

Optionally, at the position where the composite fireproof coating is provided with the structural strengthening layer, the total thickness of the fireproof basic coating and the fireproof repair coating is greater than 25 mm.

Optionally, the fireproof repair coating is bonded to the fireproof base coat;

And/or, the structural reinforcement layer is connected to the fireproof base coating by adhesive or through fasteners.

Optionally, the structural reinforcement layer is steel wire mesh.

In a second aspect, the present disclosure also provides a construction method for a fireproof building structure as described above, which includes the following steps:

Removing part of the position of the fireproof base coating arranged on the building structure substrate, so as to form repair depressions at the part of the position of the fireproof base coat;

providing a structural reinforcement layer at least part of the repaired depression;

Fill the fireproof repairing coating in the repairing depression, and combine the fireproofing basic coating and the fireproofing repairing coating to form a composite fireproofing coating, or fill the structural reinforcement layer and the repairing depression in the repairing depression The above-mentioned fireproof repairing coating is combined to form a composite fireproofing coating by combining the fireproofing basic coating, the structural strengthening layer and the fireproofing repairing coating.

Optionally, before the step of removing part of the fireproof basic coating disposed on the building structure substrate to form repair depressions at part of the fireproof basic coating, the step further includes:

Carrying out quality inspection on the fireproof basic coating, to confirm the part positions where the fireproof basic coating is removed.

Optionally, before the step of inspecting the quality of the fire-resistant base coating to confirm the position of the part where the fire-resistant base coating is removed, the step further includes:

On-site sampling is carried out to described fireproof basic coating, to obtain the original paint sample of described fireproof basic coating;

Detecting the thermal conductivity, linear expansion coefficient, compressive strength and tensile strength of the original paint sample, and obtaining detection data;

Substituting the detection data into the working condition stress calculation model for simulation analysis to obtain analysis results, and judging the repair conditions of the fireproof basic coating based on the analysis results.

Optionally, the fireproofing repair coating is filled in the repairing depression, and the fireproofing base coating and the fireproofing repairing coating are combined to form a composite fireproofing coating, or the repairing depression is Before filling the structural reinforcement layer and the fire-resistant repair coating, combining the fire-resistant basic coating, the structural reinforcement layer and the fire-resistant repair coating to form a composite fire-resistant coating, the step also includes:

Detecting the compatibility of the original paint of the fireproof basic coating and the new paint of the fireproof repair coating to obtain compatibility result data;

comparing the compatibility result data with a compatibility setting range, and using the new paint when the compatibility result data is within the compatibility setting range, or when the compatibility result data is within the compatibility setting range When the compatibility result data is outside the compatibility setting range, the new paint is replaced, and the compatibility test is carried out again.

Optionally, comparing the compatibility result data with a compatibility setting range, and using the new compatibility result data when the compatibility result data is within the compatibility setting range. paint, or replace the new paint when the compatibility result data is outside the compatibility setting range, and re-perform the step of compatibility testing and further include:

Perform simulated stress calculation on the new paint of the fire protection repair coating to determine the set thickness of the fire protection repair coating.

Optionally, the fireproofing repair coating is filled in the repairing depression, and the fireproofing base coating and the fireproofing repairing coating are combined to form a composite fireproofing coating, or the repairing depression is The step of filling the structural reinforcement layer and the fireproof repair coating to combine the fireproof base coat, the structural reinforcement layer and the fireproof repair coating to form a composite fireproof coating specifically includes:

determining the total thickness of the fireproof base coat and the fireproof repair coating according to the set thickness of the fireproof repair coating;

In the case that the total thickness is not greater than 25mm, the fireproof repair coating is filled in the repair depression, and the fireproof base coat and the fireproof repair coating are combined to form the composite fireproof coating; or, in the case where the total thickness is greater than 25 mm, a structural reinforcement layer is provided at the repaired depression, and the fire-resistant base coating, the structural reinforcement layer and the fire-resistant repair coating are combined, To form a composite fireproof coating.

Compared with the prior art, the technical solution provided by the present disclosure has the following advantages:

In the fireproof building structure and construction method provided by the present disclosure, the damaged part of the fireproof base coating is treated to form a repair depression, and the fireproof repair coating is filled in the repair depression, so that only the fireproof foundation coating can be applied. There is no need to remove all the defects of the layer, such as hollowing, deformation, etc., and the treatment area is smaller than the overall removal of the fireproof basic coating, and the thickness of the new coating that needs to be sprayed It is also smaller, so it greatly saves the cost of the fire-resistant coating required for repair and the time required for re-repairing the fire-resistant coating, and the setting of the structural reinforcement layer further ensures the bonding strength between the new coating and the old coating , so as to ensure the overall strength of the treated composite protective coating, that is, to ensure the stability of the composite fireproof coating during use.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings without paying creative labor.

FIG. 1 is a structural schematic diagram of a fireproof building structure described in an embodiment of the present disclosure;

Fig. 2 is a structural schematic diagram of a fireproof building structure after repair according to an embodiment of the present disclosure;

Fig. 3 is a partial structural schematic diagram of part A in Fig. 2;

Fig. 4 is the local structural schematic diagram of part B in Fig. 2;

FIG. 5 is a structural schematic diagram of another fireproof building structure after repair according to an embodiment of the present disclosure;

Fig. 6 is a schematic flowchart of a construction method of a fireproof building structure according to an embodiment of the present disclosure.

Among them, 1. Building structure matrix; 2. Fireproof basic coating; 21. Repairing depressions; 3. Fireproofing repairing coating; 4. Structural strengthening layer.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, in the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways than described here; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, and Not all examples.

Most of the building structures are coated with fireproof materials to improve the fire resistance of the material of the building structure, which can slow down the speed of flame spread in the extreme case of fire.

However, during the construction process of the building, during the stoppage and resumption of the project, the unfinished fireproof coating on the surface of the building structure will be damaged by rain erosion, high temperature deformation and other factors. Usually, the fireproof coating on the surface of the building structure is generally removed and recoated, which will lead to further delays in the construction period and higher construction costs.

In view of the above-mentioned defects, this embodiment provides a fireproof building structure and a fireproof coating construction method for the fireproof building structure. By partially repairing the fireproof basic coating, the effect of saving cost and time is realized. For the specific setting of the fireproof building structure and the fireproof coating construction method of the fireproof building structure, see the following embodiments.

As shown in Figures 1-5, this embodiment provides a fireproof building structure, which includes a building structure substrate 1 and a composite fireproof coating covering the building structure substrate 1, the composite fireproof coating includes a fireproof base coating 2. The structural reinforcement layer 4 and the fireproof repair coating 3, the fireproof basic coating 2 has repair depressions 21 at some positions, the fireproof repair coating 3 is filled in the repair depressions 21, and the structural reinforcement layer 4 is arranged on at least part of the repair depressions 21 and located between the fireproof base coat 2 and the fireproof repair coat 3.

Wherein, the building structure matrix 1 may specifically be a part of the building structure that is a steel structure, such as a steel beam structure, or a steel-concrete column structure, as shown in FIGS. 2 and 5 for details. The shape of the repaired depression 21 on the fireproof base coat 2 is determined by the degree of repair required by the fireproof base coat 2. For example, at some positions that are exposed to the outside world and are easily eroded by external rainwater, the area of the repaired depression 21 is relatively small. big.

When filling the fireproof repair coating 3 in the repair depression 21, spraying can be adopted, and, before spraying, the new paint of the fireproof repair coat 3 is formulated with powder: sizing material: water = 4: 1: 3.5 Stir evenly, of course, in other embodiments, it can also be made in different proportions for different new coatings. After the new paint is properly proportioned, use a squeeze mortar pump to evenly spray the prepared paint slurry on the surface of the fireproof basic coating 2, and finally use a self-weight spray gun to spray and make up to ensure uniform thickness. When spraying, the spray gun should be perpendicular to the surface of the fireproof basic coating 2, the distance is preferably 40-60cm, the air pressure is kept at 0.4-0.6MPa, and the diameter of the spray gun mouth is 6-10mm. During the spraying process, keep a constant speed and do not stay in the same place, and use a trowel or a small hand-held spray gun to make up for the areas that cannot be sprayed at the corners in time. In addition, during the spraying process, the spraying distance and angle should be mastered to reduce the rebound and drop of the paint.

When spraying the fire protection repair coating 3, it is advisable to adopt the method of layered spraying. The thickness of each layer of the new coating layered spraying should be controlled at 6mm. When spraying the next layer, it should be carried out after the layer is dry until the required thickness is reached. Moreover, the spraying interval should be controlled at about 24 hours at a temperature of 20°C. When spraying, each operator should be equipped with a professional steel needle to detect the thickness to ensure that the thickness is appropriate each time, and after spraying, use a special coating thickness gauge to check whether the thickness meets the standard.

In the fireproof building structure provided by this embodiment, the damaged part of the fireproof basic coating 2 is processed to form a repair depression 21, and the fireproof repair coating 3 is filled in the repair depression 21, thereby realizing that only the defective , for example, the local treatment of hollowing, deformation, etc., does not need to be completely removed. Compared with the method of overall removal of the fireproof basic coating 2, the treatment area is small, and the thickness of the new coating that needs to be sprayed is also small, which is greatly improved. It saves the cost of the required fireproof coating and the time required for re-repairing the protective coating, and the setting of the structural strengthening layer 4 ensures the bonding strength between the new coating and the old coating, further ensuring the composite type after treatment. The overall strength of the protective coating ensures the stability of the fireproof coating during use.

As shown in Figure 6, for the fireproof building structure provided in this implementation, this embodiment further provides a construction method for a protective building structure, which specifically includes the following steps:

Step 101, removing part of the position of the fireproof base coating provided on the building structure substrate, so as to form repair depressions at part of the position of the fireproof base coat;

Step 102, setting a structural strengthening layer on at least part of the repaired depression;

Step 103: Fill the fireproof repairing coating in the repairing depression, and combine the fireproofing base coating and the fireproofing repairing coating to form a composite fireproofing coating, or fill the structural strengthening layer and the fireproofing repairing coating in the repairing depression, so that The fire-resistant base coat, the structural reinforcement layer and the fire-resistant repair coat are combined to form a composite fire-resistant coating.

In some embodiments, before the step of removing the part of the fireproof basic coating disposed on the building structure substrate, so that the repaired depression is formed at the position of the fireproof basic coating after removal, the following steps are further included:

Perform a quality inspection of the fire-resistant base coat to identify where the fire-resistant base coat has been removed.

Among them, the quality inspection of the fireproof basic coating is specifically the appearance quality inspection of the fireproof basic coating, which mainly includes whether there are problems such as hollowing, cracking, and pulverization at various positions of the fireproof basic coating. In addition, when removing quality problems such as hollowing, cracking, peeling and falling off of the original fireproof coating, it can be directly removed to the surface of the building structure substrate, and it is guaranteed that there is no paint adhesion and no dust on the surface after removal. When cleaning the remaining places, a part of the fireproof basic coating can be properly removed, for example, by grinding to ensure that the floating ash bonding layer and the powdered surface layer are removed, and the off-white original fireproof coating layer can be exposed. When sanding, it is necessary to ensure that the retained original fire-resistant coating layer is sanded until it is firm and free of chalking.

In some embodiments, after the original fire-resistant paint layer peels off, the quality of the anti-corrosion paint on the surface of the building structure needs to be further checked. For anti-rust paint, the touch-up paint should overlap with the original anti-corrosion layer by 3cm.

In some embodiments, it is also necessary to conduct a thickness test on the fireproof base coat, so as to confirm the position of the part where the fireproof base coat is removed. Among them, the thickness detection of the fireproof basic coating is mainly used to judge whether the thickness of each position of the fireproof basic coating meets the fire protection requirements, and for the positions that do not meet the fire protection requirements, it needs to be reprocessed and followed by fire protection repair The construction of the coating so that it meets the requirements.

After completing various inspections on the fireproof basic coating, the location where the fireproof basic coating needs to be repaired can be determined, that is, the location of the repaired depression of the fireproof coating can be confirmed. In other embodiments, the bonding strength of the fireproof basic coating can be further tested to further confirm whether the fireproof basic coating is eligible for repair.

In some embodiments, before the step of performing quality inspection on the fire-resistant base coating to confirm the location of the part where the fire-resistant base coating is removed, it also includes:

On-site sampling of fire-resistant base coats to obtain original paint samples for fire-resistant base coats;

Detect the thermal conductivity, linear expansion coefficient, compressive strength and tensile strength of the original paint sample, and obtain the test data;

Substituting the test data into the working condition stress calculation model for simulation analysis to obtain the analysis results, and determine the repair conditions of the fireproof basic coating based on the analysis results.

In the early stage of construction preparation, it is necessary to carry out investigation and inspection work on the site to determine whether the fireproof basic coating is eligible for repair. The original paint can be sampled on site according to the test requirements. The test items include thermal conductivity, linear expansion coefficient, compressive strength and tensile strength. The following simulation analysis is used to determine whether the original paint has the repair conditions. Among them, whether the repair conditions are met, that is, whether the fire-resistant basic coating can still meet the fire-proof requirements. If the fire-proof requirements are met, the repair conditions are met. If the fire-proof requirements are not met, the entire fire-resistant basic coating needs to be removed.

Specifically, the simulation analysis of the fireproof basic coating sample can be as follows:

Input the performance parameters obtained through the test, and analyze the structural stress under the most unfavorable conditions;

Simulate the stress state of the structure subjected to its own weight and temperature deformation at room temperature to determine its safety;

Simulate the temperature gradient change inside and outside the material and the stress state after the fire.

Taking the fire-resistant coating applied to the steel beam structure as an example, in the actual implementation, after importing the relevant material parameters, under the action of the self-weight and temperature deformation load of the fire-resistant basic coating, the average cross-sectional size of the steel columns and steel beams in this project is taken It can be obtained after finite element stress calculation. Under the conditions of self-weight and normal temperature, the maximum effective stress generated by the coating structure is less than the allowable value of its strength, that is, the overall coating is stable at normal temperature. After considering the effect of temperature gradient, the maximum effective stress produced by the coating structure exceeds the allowable value of its strength, and the coating may be partially cracked. After supplementing the high-temperature fire resistance test of the original coating sample, no pulverization or significant cracking of the specimen was found. , Broken phenomenon, it is determined that the original coating can maintain its integrity.

In some embodiments, the fireproof repair coating is filled in the repaired depression, and the original fireproof coating and the fireproof repair coating are combined to form a composite fireproof coating, or the structural reinforcement layer and the fireproof repair coating are filled in the repaired depression. layer, to combine the original fireproof coating, the structural reinforcement layer and the fireproof repair coating to form a composite fireproof coating. Before the step also includes:

Compatibility test between the original paint of the fire protection base coat and the new paint of the fire protection repair coat to obtain compatibility result data;

Compare the compatibility result data to the compatibility set range and apply new paint when the compatibility result data is within the compatibility set range, or when the compatibility result data is within the compatibility Replace with new paint when it is out of the set range, and re-do the compatibility test.

When judging whether the compatibility of old and new coatings meets the requirements, a composite coating sample column can be used to facilitate testing and testing. Before testing for compatibility, determine whether new coatings for fire protection repair coatings meet fire protection requirements. Specifically, due to the long test period of the new paint fire performance parameters, the material type inspection report shall prevail. The compressive performance and adhesive performance shall be subject to the results of the test report after being sampled and sent to the laboratory after on-site witnessing.

In some embodiments, the compatibility result data is compared with the compatibility set range, and new paint is used when the compatibility result data is within the compatibility set range, or when the compatibility When the result data is outside the compatibility setting range, replace with a new paint and perform the steps of re-compatibility testing, including:

Perform simulated stress calculations for new coatings of fire repair coatings to determine the set thickness of the fire repair coating.

Specifically, the respray thickness can be determined based on the performance of old and new coatings and the simulation stress calculation results of the current coating situation, and relevant experts of steel structure fireproof coatings can be organized to demonstrate the method and final thickness, and form relevant technical documents. Then comprehensively check the defective parts and types of the on-site fireproof basic coating, as well as the average thickness of the beams and columns of each layer (needle measurement method can be used, and the marked parts are kept until the thickness is removed after spraying), and a check list is formed for subsequent base treatment. item and thickness control. After confirming the above data, further complete the preparations for the dust-proof facilities on the exterior facade and the protection of indoor finished products, and do a good job in the pre-treatment preparations.

In some embodiments, the fireproof repair coating is filled in the repaired depression, and the original fireproof coating and the fireproof repair coating are combined to form a composite fireproof coating, or the structural reinforcement layer and the fireproof repair coating are filled in the repaired depression. layer, the steps of combining the original fireproof coating, structural reinforcement layer and fireproof repair coating to form a composite fireproof coating include:

Determine the total thickness of the fireproof base coating and the fireproof repair coating according to the set thickness of the fireproof repair coating;

If the total thickness is not greater than 25mm, fill the repaired depression with a fireproof repair coating, and combine the fireproof base coating and the fireproof repair coating to form a composite fireproof coating; or, if the total thickness is greater than 25mm In some cases, a structural reinforcement layer is set at the repaired depression, and the fireproof base coating, structural reinforcement layer and fireproof repair coating are combined to form a composite fireproof coating.

That is to say, for the composite fireproof layer with a total thickness of no more than 25mm after spraying, such as the bottom and top of steel beams, it is advisable to add a structural reinforcement layer, such as steel wire The network is strengthened. For a composite fireproof layer with a total thickness greater than 25mm after spraying, a structural strengthening layer, such as steel wire mesh, should be hung on the periphery of the building structure matrix or the original fireproof coating layer, and the fixing form can be based on the building structure matrix or the original fireproof coating layer. The cross-section type of the joint is carried out by methods such as lap joint, nailing, bonding, and pressing.

After the repair work is completed, the coating needs to be cured. The curing time is 28 days. The temperature of the curing environment should be between 5-35 °C and the humidity should be less than 85%. The air should be circulated and avoid exposure to the sun. Wrap plastic film within 24-48 hours of completion to prevent surface cracking, and after construction, it should be protected from rain and moisture. The adjacent components should be temporarily covered or repainted after the construction of the facade is completed.

It should be noted that in this article, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only specific implementation manners of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A fireproof building structure, characterized in that, comprises a building structure matrix (1) and a composite fireproof coating that is covered on the building structure matrix (1); The composite fireproof coating comprises a fireproof base coat (2), a structural strengthening layer (4) and a fireproof repair coat (3), and a part of the fireproof base coat (2) has repair depressions (21) , the fireproof repair coating (3) is filled in the repair depression (21), the structural strengthening layer (4) is arranged at least part of the repair depression (21) and is located in the fireproof base coating ( 2) and the fire repair coating (3). 2. The fireproof building structure according to claim 1, characterized in that, at the position of the composite fireproof coating provided with the structural reinforcement layer (4), the fireproof basic coating (2) and The total thickness of the fireproof repair coating (3) is greater than 25mm. 3. The fireproof building structure according to claim 1, characterized in that, the fireproof repair coating (3) is bonded and connected with the fireproof basic coating (2); And/or, the structural reinforcement layer (4) is bonded or connected with the fireproof base coating (2) by fasteners. 4. The fireproof building structure according to claim 1, characterized in that, the structural reinforcement layer (4) is a steel wire mesh. 5. A construction method of the fireproof building structure according to any one of claims 1-4, characterized in that, comprising the following steps: Removing part of the position of the fireproof base coating arranged on the building structure substrate, so as to form repair depressions at the part of the position of the fireproof base coat; providing a structural reinforcement layer at least part of the repaired depression; Fill the fireproof repairing coating in the repairing depression, and combine the fireproofing basic coating and the fireproofing repairing coating to form a composite fireproofing coating, or fill the structural reinforcement layer and the repairing depression in the repairing depression The above-mentioned fireproof repairing coating is combined to form a composite fireproofing coating by combining the fireproofing basic coating, the structural strengthening layer and the fireproofing repairing coating. 6. The construction method of the fireproof building structure according to claim 5, characterized in that, the partial position of the fireproof basic coating arranged on the building structure matrix is removed, so that the part of the fireproof basic coating The step of forming a repair depression at the location also includes: Carrying out quality inspection on the fireproof basic coating, to confirm the part positions where the fireproof basic coating is removed. 7. The construction method of fireproof building structure according to claim 6, characterized in that, before the step of performing quality inspection on the fireproof base coating to confirm the partial position of removing the fireproof base coat Also includes: On-site sampling is carried out to described fireproof basic coating, to obtain the original paint sample of described fireproof basic coating; Detecting the thermal conductivity, linear expansion coefficient, compressive strength and tensile strength of the original paint sample, and obtaining detection data; Substituting the detection data into the working condition stress calculation model for simulation analysis to obtain analysis results, and judging the repair conditions of the fireproof basic coating based on the analysis results. 8. The construction method of fireproof building structure according to claim 5, characterized in that, the fireproof repair coating is filled in the repair depression, and the fireproof basic coating is combined with the fireproof repair coating , to form a composite fireproof coating, or fill the structural strengthening layer and the fireproofing repairing coating in the repairing depression, so that the fireproofing base coating, the structural strengthening layer and the fireproofing repairing coating are combined, Before the step of forming composite fireproof coating, it also includes: Detecting the compatibility of the original paint of the fireproof basic coating and the new paint of the fireproof repair coating to obtain compatibility result data; comparing the compatibility result data with a compatibility setting range, and using the new paint when the compatibility result data is within the compatibility setting range, or when the compatibility result data is within the compatibility setting range When the compatibility result data is outside the compatibility setting range, the new paint is replaced, and the compatibility test is carried out again. 9. The construction method of fireproof building structure according to claim 8, characterized in that, comparing the compatibility result data with the compatibility setting range, and when the compatibility result Use the new paint when the data is within the compatibility setting range, or replace the new paint when the compatibility result data is outside the compatibility setting range, and perform compatibility again After the sexual testing steps also include: Perform simulated stress calculation on the new paint of the fire protection repair coating to determine the set thickness of the fire protection repair coating. 10. The construction method of fireproof building structure according to claim 9, characterized in that, filling the fireproof repair coating in the repair depression, and combining the fireproof basic coating and the fireproof repair coating , to form a composite fireproof coating, or fill the structural strengthening layer and the fireproofing repairing coating in the repairing depression, so that the fireproofing base coating, the structural strengthening layer and the fireproofing repairing coating are combined, The steps to form a composite fireproof coating specifically include: determining the total thickness of the fireproof base coat and the fireproof repair coating according to the set thickness of the fireproof repair coating; In the case that the total thickness is not greater than 25mm, the fireproof repair coating is filled in the repair depression, and the fireproof base coat and the fireproof repair coating are combined to form the composite fireproof coating; or, in the case where the total thickness is greater than 25 mm, a structural reinforcement layer is provided at the repaired depression, and the fire-resistant base coating, the structural reinforcement layer and the fire-resistant repair coating are combined, To form a composite fireproof coating.

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