A method for grouting fire retardant coating on large diameter circular steel columns

Abstract

The present invention discloses a method for grouting fire retardant coating on a large-diameter circular steel column. The method comprises: 1. installing and securing a sizing mold; 2. preparing the fire retardant coating; 3. grouting; 4. removing a fixing assembly; 5. applying the next section of fire retardant coating; and 6. applying a putty layer and a surface layer of artistic coating. The present invention installs a sizing mold on the outside of the steel column and uses a fixing assembly to secure the position of the sizing mold. This ensures the installation position of the sizing mold and the thickness of the fire retardant coating section formed after grouting, avoids uneven thickness caused by manual application or spraying, and improves the quality of fire retardant coating application.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a fireproof coating grouting method for a large-diameter circular steel column. Background Art

[0002] During the construction process, projects with steel frame structures as the main body need to be supported by circular steel columns. Due to the poor fire resistance of steel columns, a fireproof layer must be covered on the surface of the steel columns to achieve fire protection. In traditional construction, the fireproof coating is sprayed on the surface of the steel columns in layers manually, that is, a construction method of using compressed air and a spray gun to atomize the coating. During the spraying, part of the fireproof coating is lost, and the atomization of the spraying material affects the health of the operator. During the spraying process, the rest of the finished product in the sprayed area needs to be protected, and the finished product protection amount is large. In addition, the fireproof material can be applied manually using tools such as fiberglass scrapers and plastic scrapers. Special scraping materials need to be used during the application, which has high material costs and large labor input. The thickness of the fireproof coating needs to be judged manually, resulting in low construction efficiency and extended construction time. It is also easy to have an uneven layer of fireproof coating, which is not conducive to the long-term use of the steel columns. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies in the above-mentioned prior art and provide a method for grouting fire-retardant coatings for large-diameter circular steel columns. A shaping mold is installed on the outside of the steel column, and a fixing assembly is used to fix the position of the shaping mold, thereby ensuring the installation position of the shaping mold and the thickness of the fire-retardant coating section formed after the grouting is completed, avoiding the uneven thickness caused by manual application or spraying, and improving the quality of the fire-retardant coating construction.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for grouting fire retardant coating on large-diameter circular steel columns, characterized in that the method comprises the following steps:

[0005] Step 1: Install and fix the shaping mold. The process is as follows:

[0006] Step 101: First, vertically install a first shaping template on the outside of the steel column. The first shaping template is arranged along the height direction of the steel column and is arranged on one side of the steel column. Then, vertically install a second shaping template on the other side of the steel column. The connection between the first shaping template and the second shaping template is clamped and connected to complete the installation of the shaping mold. A fire retardant coating grouting cavity is formed between the shaping mold and the outer side surface of the steel column.

[0007] Step 102: Install multiple clamps on the outside of the first and second shaping templates, adjust the positions of the clamps so that the inner side of the clamps is in close contact with the outer side of the shaping mold, and connect and secure the clamps with bolts; the multiple clamps constitute a fixed assembly installed on the outside of the shaping mold; wherein the multiple clamps are arranged along the height direction of the steel column;

[0008] Step 2: Prepare the fire retardant coating: prepare a main material mixed slurry according to the mass ratio of coating and water required by the design, and place the prepared fire retardant coating in one storage chamber of the two-component sprayer; prepare an accelerator mixed liquid according to the mass ratio of accelerator and water required by the design, and place the prepared accelerator mixed liquid in the other storage chamber of the two-component sprayer;

[0009] Step 3, grouting: insert the end of the grouting pipe into the fire retardant coating grouting cavity, start the two-component sprayer to grout the fire retardant coating grouting cavity until the grouting height of the protective coating is flush with the top of the shaping mold, and turn off the two-component sprayer;

[0010] Step 4: Remove the fixing assembly: After the fire retardant coating in the fire retardant coating grouting cavity solidifies, remove the fixing assembly;

[0011] Step 5, constructing the next section of fire retardant coating: repeating steps 1 to 4, grouting the next section of fire retardant coating along the height direction of the steel column until the construction of the fire retardant coating section is completed, and a plurality of fire retardant coating sections grouting on the outer side of the steel column and continuously arranged are obtained;

[0012] Step 6. Apply putty layer and artistic paint surface layer: After the construction of multiple fire retardant paint sections on the outer side of the steel column is completed, apply a layer of putty on the outer side of the shaping mold to form a putty layer. After the putty layer solidifies, apply a layer of artistic paint on the outer side of the putty layer to form an artistic paint surface layer.

[0013] The above-mentioned method for grouting fire-retardant coating on large-diameter circular steel columns is characterized in that: in step 101, the first shaping template and the second shaping template are both arc-shaped structures; the end of the first shaping template is provided with a clip-on outer groove, and the end of the second shaping template is provided with a clip-on inner groove that cooperates with the clip-on outer groove, and the clip-on outer groove and the clip-on inner groove are both arranged along the height direction of the steel column.

[0014] The above-mentioned method for grouting fire-retardant coating on large-diameter circular steel columns is characterized in that: in step 101, two groups of breathable components are opened on the first shaping template and the second shaping template, and the two groups of breathable components are evenly arranged along the height direction of the steel column; each group of the breathable components includes two breathable holes arranged along the circumferential direction of the steel column.

[0015] The above-mentioned method for grouting fire-retardant coating on large-diameter circular steel columns is characterized in that: in step 101, before clamping the first shaping template and the second shaping template, it is necessary to use a five-line instrument to calibrate the installation positions of the first shaping template and the second shaping template, so that the installation positioning deviation of the shaping mold is no more than 2 mm, and the verticality of the facade of the shaping mold is less than 2 mm.

[0016] The above-mentioned method for grouting fire-retardant coating for large-diameter circular steel columns is characterized in that: in step three, when grouting the fire-retardant coating into the fire-retardant coating grouting cavity, a one-time grouting method is adopted, and the grouting flow rate is 10L / min~15L / min.

[0017] The above-mentioned method for grouting fire-retardant coating for large-diameter circular steel columns is characterized in that: in step three, when grouting the fire-retardant coating in the fire-retardant coating grouting cavity, when the fire-retardant coating leaks out of the air vents, a wooden wedge is inserted into the air vents to seal the air vents.

[0018] The above-mentioned method for grouting fire-retardant coating on large-diameter circular steel columns is characterized in that: in step five, when constructing the next section of fire-retardant coating, a positioning plate is installed on the bottommost fixed component, the positioning plate is arranged between the shaping mold and the clamp, and the bottom of the positioning plate extends to the top of the shaping mold of the previous section of fire-retardant coating, and is removed together with the fixed component after the construction of the next section of fire-retardant coating is completed.

[0019] The above-mentioned method for grouting fire-retardant coating on large-diameter circular steel columns is characterized in that: in step six, before applying the putty layer, an alkali-resistant glass fiber mesh cloth is first hung on the outer side of the connection between the first shaping template and the second shaping template on the shaping mold, and then putty is applied on the outer side of the alkali-resistant glass fiber mesh cloth.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The present invention installs a shaping mold on the outside of the steel column and uses a fixing component to fix the position of the shaping mold, thereby ensuring the installation position of the shaping mold and the thickness of the fire retardant coating section formed after grouting is completed, avoiding the uneven thickness caused by manual application or spraying, and improving the quality of fire retardant coating construction.

[0022] 2. The present invention utilizes a standardized mold to construct the fire retardant coating, and through factory-based batch production of the standardized mold, ensures the appearance, flatness and verticality of the fire retardant coating after construction, has high production efficiency, and improves the decorative effect of the fire retardant coating.

[0023] 3. The present invention utilizes a two-component sprayer to inject grout into the grouting cavity of the fire retardant coating, thereby shortening the construction time of the fire retardant coating and improving the construction efficiency of the fire retardant coating.

[0024] 4. The present invention injects fire retardant coating into the fire retardant coating grouting cavity, thereby avoiding the spray atomization phenomenon that occurs when manually applying or spraying fire retardant materials, reducing pollution to the environment, and protecting the health of workers; at the same time, it avoids the waste of fire retardant coating during construction, saves fire retardant coating materials, and saves investment in finished product protection.

[0025] To sum up, the present invention installs a shaping mold on the outside of the steel column and uses a fixing component to fix the position of the shaping mold, thereby ensuring the installation position of the shaping mold and the thickness of the fire retardant coating section formed after grouting is completed, avoiding uneven thickness due to manual application or spraying, and improving the quality of fire retardant coating construction.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the connection relationship between the steel column and the shaping mold of the present invention.

[0028] Figure 2 This is a schematic diagram of the positional relationship among the fire retardant coating section, steel column and shaping mold after grouting is completed in the present invention.

[0029] Figure 3 It is a flowchart of the present invention.

[0030] Description of the accompanying drawings:

[0031] 1—steel column; 2—first fixed formwork; 3—second fixed formwork;

[0032] 4—Card-mounted outer groove; 5—Bolt; 6—Fire retardant coating grouting cavity;

[0033] 7—fire retardant coating section; 8—clamp; 9—wooden wedge;

[0034] 10—Positioning plate. DETAILED DESCRIPTION

[0035] like Figures 1 to 3 A method for grouting fireproof coating on a large diameter circular steel column is shown, the method comprising the following steps:

[0036] Step 1: Install and fix the shaping mold. The process is as follows:

[0037] Step 101: First, vertically install a first shaping template 2 on the outside of the steel column 1. The first shaping template 2 is arranged along the height direction of the steel column 1 and is arranged on one side of the steel column 1. Then, vertically install a second shaping template 3 on the other side of the steel column 1, and clamp the connection between the first shaping template 2 and the second shaping template 3 to complete the installation of the shaping mold. A fire retardant coating grouting cavity 6 is formed between the shaping mold and the outer side surface of the steel column 1.

[0038] Step 102: Install multiple clamps 8 on the outside of the first shaping template 2 and the second shaping template 3. Adjust the positions of the clamps 8 so that the inner side of the clamps 8 is in close contact with the outer side of the shaping mold, and connect and secure the clamps 8 with bolts 5. The multiple clamps 8 constitute a fixed assembly installed on the outside of the shaping mold. The multiple clamps 8 are arranged along the height direction of the steel column 1.

[0039] Step 2: Prepare the fire retardant coating: prepare a main material mixed slurry according to the mass ratio of coating and water required by the design, and place the prepared fire retardant coating in one storage chamber of the two-component sprayer; prepare an accelerator mixed liquid according to the mass ratio of accelerator and water required by the design, and place the prepared accelerator mixed liquid in the other storage chamber of the two-component sprayer;

[0040] Step 3, grouting: insert the end of the grouting pipe into the fire retardant coating grouting cavity 6, start the two-component sprayer to grout the fire retardant coating grouting cavity 6 until the grouting height of the protective coating is flush with the top of the shaping mold, and then turn off the two-component sprayer;

[0041] Step 4: Remove the fixing assembly: After the fire retardant coating in the fire retardant coating grouting cavity 6 is solidified, remove the fixing assembly;

[0042] Step 5, constructing the next fire retardant coating segment: repeating steps 1 to 4, grouting the next fire retardant coating segment 7 along the height direction of the steel column 1 until the construction of the fire retardant coating segment 7 is completed, and a plurality of fire retardant coating segments 7 grouted on the outer side of the steel column 1 and continuously arranged are obtained;

[0043] Step 6. Apply putty layer and artistic paint surface layer: After the construction of multiple fire retardant paint sections 7 on the outer side of the steel column 1 is completed, apply a layer of putty on the outer side of the shaping mold to form a putty layer. After the putty layer solidifies, apply a layer of artistic paint on the outer side of the putty layer to form an artistic paint surface layer.

[0044] The present invention installs a shaping mold on the outside of the steel column 1 and uses a fixing component to fix the position of the shaping mold, thereby ensuring the installation position of the shaping mold and the thickness of the fire retardant coating section 7 formed after grouting is completed, avoiding the uneven thickness caused by manual application or spraying, and improving the quality of fire retardant coating construction.

[0045] The present invention utilizes a standardized mold to construct the fire retardant coating, and through factory-based batch production of the standardized mold, ensures the appearance, flatness and verticality of the fire retardant coating after construction, has high production efficiency, and improves the decorative effect of the fire retardant coating.

[0046] The present invention utilizes a two-component sprayer to inject grout into the fire retardant coating grouting cavity 6, thereby shortening the construction time of the fire retardant coating and improving the construction efficiency of the fire retardant coating.

[0047] The present invention injects fire retardant coating into the fire retardant coating grouting cavity 6, thereby avoiding the spray atomization phenomenon that occurs when manually applying or spraying fire retardant materials, reducing pollution to the environment, and protecting the health of workers; at the same time, it avoids the waste of fire retardant coating during construction, saves fire retardant coating materials, and saves investment in finished product protection.

[0048] In actual use, the shaping mold does not need to be removed. The shaping mold is a gypsum mold. After the fire retardant coating section 7 is constructed, it is connected to the fire retardant coating section 7. The adhesion between the fire retardant coating section 7 and the shaping mold can be tested through a pull-out test.

[0049] It should be noted that in step 101, the circumferential spacing between the inner side of the shaping mold and the outer side of the steel column 1 is determined by the design requirements, that is, it is determined by the fire resistance limit time that the fire retardant coating on the outer surface of the steel column 1 can reach as required; in step 3, before grouting, the gate of the grouting pipe is inserted into the bottom of the fire retardant coating grouting cavity 6, and the grouting pipe is continuously pulled up with the height of the grouting during the grouting process. Each time the grouting pipe is pulled up, the grouting pipe should be pulled up by 300mm; after the grouting is completed, the density of the fire retardant coating in the fire retardant coating grouting cavity 6 is detected using an LTD ground penetrating radar detector. No obvious voids, voids, or loose surfaces are found, indicating that the grouting method of the present invention can effectively ensure the molding effect of the fire retardant coating. At the same time, after the grouting is completed, it is also necessary to test the bonding performance between the fire retardant coating segment 7 and the shaping mold. During the test, a detection port is opened on the shaping mold after grouting, and a pull-out test is performed on the fire retardant coating segment 7 and the shaping mold using an SHJ-40 multifunctional strength testing instrument to ensure that the shaping mold does not fall off. In step six, the artistic paint is primarily made from natural mineral powder and sand, supplemented by an emulsion to form a film. Using water as the dispersion medium, and emitting water as its volatile component, it is non-toxic, non-flammable, non-explosive, and contains no harmful substances like benzene and formaldehyde, making it more environmentally friendly than wall paint or wallpaper.

[0050] In particular, the height of the shaping mold does not exceed 1500 mm, and is preferably designed to be 1200 mm. According to the height of the steel column 1 in traditional construction, the number of the shaping molds used on each steel column 1 is greater than three. Figure 1 As shown, after the first and second fire retardant coating sections 7 are completed, the construction status diagram of the third section of the finalizing mold is built. At this time, the clamp 8 on the first section of the fire retardant coating section 7 has been removed, and the clamp 8 on the second section of the fire retardant coating section is ready to be removed.

[0051] like Figure 1 As shown, in this embodiment, in step 101, the first shaping template 2 and the second shaping template 3 are both arc-shaped structures; the end of the first shaping template 2 is provided with a clamping outer groove 4, and the end of the second shaping template 3 is provided with a clamping inner groove that cooperates with the clamping outer groove 4, and the clamping outer groove 4 and the clamping inner groove are both arranged along the height direction of the steel column 1.

[0052] During actual use, the first shaping template 2 and the second shaping template 3 are temporarily installed by utilizing the clip-on connection at the connection between the first shaping template 2 and the second shaping template 3, that is, the matching installation of the clip-on outer groove 4 and the clip-on inner groove. Subsequently, the installation position of the first shaping template 2 and the second shaping template 3 is fixed by utilizing the fixing assembly to ensure the stability of the shaping mold.

[0053] In this embodiment, in step 101, two groups of breathable components are provided on the first shaping template 2 and the second shaping template 3, and the two groups of breathable components are evenly arranged along the height direction of the steel column 1; each group of the breathable components includes two breathable holes arranged along the circumferential direction of the steel column 1.

[0054] In this embodiment, in step 101, before clamping the first shaping template 2 and the second shaping template 3, it is necessary to use a five-wire instrument to calibrate the installation positions of the first shaping template 2 and the second shaping template 3, so that the installation positioning deviation of the shaping mold is no more than 2 mm, and the verticality of the vertical surface of the shaping mold is less than 2 mm.

[0055] In this embodiment, in step three, when grouting the fire retardant coating into the fire retardant coating grouting cavity 6, a one-time grouting method is adopted, and the grouting flow rate is 10L / min~15L / min.

[0056] In this embodiment, in step three, when the fire retardant coating is grouting in the fire retardant coating grouting cavity 6, when the fire retardant coating leaks out from the air vents, wooden wedges 9 are inserted into the air vents to seal the air vents.

[0057] In actual use, the main function of the air holes is to facilitate workers' understanding of the grouting situation. When the grouting reaches the corresponding height, the fire retardant coating leaks out of the air holes, and the workers only need to use wooden wedges 9 to block it; at the same time, the air holes can also play a ventilation role during the grouting process, which facilitates grouting.

[0058] In this embodiment, in step five, when constructing the next section of the fire retardant coating segment 7, a positioning plate 10 is installed on the bottom fixed component, and the positioning plate 10 is arranged between the shaping mold and the clamp 8, and the bottom of the positioning plate 10 extends to the top of the shaping mold of the previous section of the fire retardant coating segment 7. After the construction of the next section of the fire retardant coating segment 7 is completed, it is removed together with the fixed component.

[0059] In actual use, the main purpose of installing the positioning plate 10 is to ensure the height difference of the joints between the two adjacent fire retardant coating sections 7, so that the height difference of the joints between the two adjacent fire retardant coating sections 7 is not greater than 1 mm.

[0060] In this embodiment, in step six, before applying the putty layer, an alkali-resistant glass fiber mesh cloth is first hung on the outer side of the connection between the first shaping template 2 and the second shaping template 3 on the shaping mold, and then putty is applied on the outer side of the alkali-resistant glass fiber mesh cloth.

[0061] In actual use, an alkali-resistant glass fiber mesh cloth is hung on the outside of the connection between the first shaping template 2 and the second shaping template 3 on the fire retardant coating section 7, which is an anti-cracking measure to ensure the molding effect of the fire retardant coating section 7.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for grouting fire retardant coating on large diameter circular steel columns, characterized in that: The method comprises the following steps: Step 1: Install and fix the shaping mold. The process is as follows: Step 101: First, vertically install a first shaping template (2) on the outside of the steel column (1), wherein the first shaping template (2) is arranged along the height direction of the steel column (1), and the first shaping template (2) is arranged on one side of the steel column (1); then, vertically install a second shaping template (3) on the other side of the steel column (1), and clamp the connection between the first shaping template (2) and the second shaping template (3) to complete the installation of the shaping mold, and a fire retardant coating grouting cavity (6) is formed between the shaping mold and the outer side surface of the steel column (1); Step 102: Install a plurality of clamps (8) on the outside of the first shaping template (2) and the second shaping template (3), adjust the position of the clamps (8) so that the inner side of the clamps (8) and the outer side of the shaping mold are in close contact, and connect and fix the clamps (8) with bolts (5); the plurality of clamps (8) constitute a fixed assembly installed on the outside of the shaping mold; wherein the plurality of clamps (8) are arranged along the height direction of the steel column (1); Step 2: Prepare the fire retardant coating: prepare a main material mixed slurry according to the mass ratio of coating and water required by the design, and place the prepared fire retardant coating in one storage chamber of the two-component sprayer; prepare an accelerator mixed liquid according to the mass ratio of accelerator and water required by the design, and place the prepared accelerator mixed liquid in the other storage chamber of the two-component sprayer; Step 3, grouting: insert the end of the grouting pipe into the fire retardant coating grouting cavity (6), start the two-component sprayer to grout the fire retardant coating grouting cavity (6), until the grouting height of the fire retardant coating is flush with the top of the shaping mold, and then turn off the two-component sprayer; Step 4, removing the fixing assembly: after the fire retardant coating in the fire retardant coating grouting cavity (6) solidifies, remove the fixing assembly; Step 5, constructing the next fire retardant coating section: repeating steps 1 to 4, arranging the next fire retardant coating section (7) along the height direction of the steel column (1) for grouting, until the construction of the fire retardant coating section (7) is completed, and a plurality of fire retardant coating sections (7) grouting on the outer side of the steel column (1) and arranged continuously are obtained; Step 6: Applying a putty layer and an artistic paint surface layer: After the construction of the multiple fire retardant paint sections (7) on the outer side of the steel column (1) is completed, a layer of putty is first applied on the outer side of the shaping mold to form a putty layer. After the putty layer solidifies, a layer of artistic paint is applied on the outer side of the putty layer to form an artistic paint surface layer.

2. The method for grouting fire retardant coating on a large diameter circular steel column according to claim 1, characterized in that: In step 101, the first shaping template (2) and the second shaping template (3) are both arc-shaped structures; the end of the first shaping template (2) is provided with a clamping outer groove (4), and the end of the second shaping template (3) is provided with a clamping inner groove that cooperates with the clamping outer groove (4), and the clamping outer groove (4) and the clamping inner groove are both arranged along the height direction of the steel column (1).

3. The method for grouting fire retardant coating on a large diameter circular steel column according to claim 1, characterized in that: In step 101, two groups of ventilation components are provided on each of the first shaping template (2) and the second shaping template (3), and the two groups of ventilation components are evenly arranged along the height direction of the steel column (1); each group of ventilation components includes two ventilation holes arranged along the circumferential direction of the steel column (1).

4. The method for grouting fire retardant coating on a large diameter circular steel column according to claim 1, characterized in that: In step 101, before the first shaping template (2) and the second shaping template (3) are clamped, the installation positions of the first shaping template (2) and the second shaping template (3) need to be calibrated using a five-wire instrument, so that the installation positioning deviation of the shaping mold is no more than 2 mm and the verticality of the vertical surface of the shaping mold is less than 2 mm.

5. The method for grouting fire retardant coating on a large diameter circular steel column according to claim 1, characterized in that: In step three, when grouting the fire retardant coating into the fire retardant coating grouting cavity (6), a one-time grouting method is adopted, and the grouting flow rate is 10L / min~15L / min.

6. The method for grouting fire retardant coating on a large diameter circular steel column according to claim 3, characterized in that: In step three, when the fire retardant coating is grouting in the fire retardant coating grouting cavity (6), if the fire retardant coating leaks out of the vent hole, a wooden wedge (9) is inserted into the vent hole to seal the vent hole.

7. The method for grouting fire retardant coating on a large diameter circular steel column according to claim 1, characterized in that: In step five, when constructing the next fire retardant coating section (7), a positioning plate (10) is installed on the bottommost fixing assembly, the positioning plate (10) is arranged between the shaping mold and the clamp (8), and the bottom of the positioning plate (10) extends to the top of the shaping mold of the previous fire retardant coating section (7), and is removed together with the fixing assembly after the construction of the next fire retardant coating section (7) is completed.

8. The method for grouting fire retardant coating on a large diameter circular steel column according to claim 1, characterized in that: In step six, before applying the putty layer, an alkali-resistant glass fiber mesh cloth is hung on the outer side of the connection between the first shaping template (2) and the second shaping template (3) on the shaping mold, and then putty is applied on the outer side of the alkali-resistant glass fiber mesh cloth.

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