Square steel column thick fireproof layer regular and uniform in thickness
By combining spraying the inner layer and scraping the outer layer, along with the design of inner and outer corner protectors, the problem of low construction efficiency of thick fireproof coatings was solved, resulting in a fireproof layer with uniform and regular thickness, thus improving construction efficiency and quality.
Patent Information
- Application Number
- CN202423116280.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing technologies require multiple layers of thick fire-retardant coatings, which takes too long to complete and makes it difficult to ensure smoothness and uniformity, resulting in low construction efficiency.
The method combines spraying the inner layer and scraping the outer layer. The sprayed inner layer is thicker than the scraped outer layer. An inner corner guard is installed on the inner layer to assist in shaping, and an outer corner guard is installed on the outer layer for protection. Combined with thickness detection points, the construction is carried out segment by segment to ensure uniform thickness.
It enables rapid construction of thick fireproof layers with uniform and regular thickness, reduces construction layers, and improves construction efficiency and overall quality of the fireproof layer.
Smart Images
Figure CN223621084U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fire protection technology, and in particular to a thick fireproof layer for regular and uniformly thick square steel columns. Background Technology
[0002] The strength of steel decreases significantly after being burned by fire. Therefore, the surface of steel load-bearing components in buildings needs to be coated with fire-retardant paint to prevent the steel from directly contacting high-temperature flames.
[0003] Fire-retardant coatings used for fireproofing typically include intumescent and non-intumescent fire-retardant coatings. Intumescent fire-retardant coatings, as the name suggests, expand and foam when exposed to fire, forming a layer of insulating foam material. Non-intumescent fire-retardant coatings, on the other hand, are refractory materials that do not undergo significant physicochemical changes when exposed to fire. They rely on their insulating properties to prevent the internal steel from contacting the fire. Therefore, non-intumescent fire-retardant coatings have a much longer fire resistance time and generally do not require recoating after a fire (repairs are sufficient), but require a much greater thickness, making them typical thick-film coatings.
[0004] Fire-retardant coatings have significantly higher requirements for flatness and regularity than conventional coatings. If there are thin or damaged areas, these areas will become weak points when exposed to fire. After burning, the strength of these weak points will decrease significantly, creating a step difference in strength compared to the surrounding materials. This can lead to stress concentration at these locations and cause uncontrollable consequences.
[0005] Existing technologies typically employ multi-layer coating to achieve a smooth and uniform finish for thick coatings. Taking the Sanya Cultural Center project, which is the subject of this invention, as an example, the fireproof layer on its square steel columns is over 30 millimeters thick. According to existing methods, this would require six layers of coating. Given the large number of square steel columns used in this project, this approach would be unacceptable in terms of construction time.
[0006] Typically, when applying thick coatings in multiple layers, the same method is used: either multiple layers of spraying or multiple layers of scraping. However, the inventors discovered that while spraying has advantages in overall thickness control, it is prone to various defects in certain areas and the edges are irregular. Scraping, on the other hand, is inferior in overall thickness control but has fewer local defects. Utility Model Content
[0007] This utility model provides a thick fireproof layer for square steel columns that is regular and has a uniform thickness.
[0008] The technical problem to be solved is that thick fire-retardant coatings require multiple layers, which takes too long to complete.
[0009] To solve the above technical problems, the present invention adopts the following technical solution: a regular and uniformly thick fireproof layer for square steel columns, including a sprayed inner layer attached to the square steel column, and a sprayed inner layer wrapped around the sprayed inner layer and used to treat local unevenness defects formed during the spraying process, wherein the thickness of the sprayed inner layer is greater than that of the scraped outer layer.
[0010] An inner corner protector is provided between the inner sprayed layer and the outer scraped layer to assist in shaping and prevent cracking at the edges of the fireproof layer. The inner corner protector wraps around the edges of the inner sprayed layer and is embedded in the inner sprayed layer. An outer corner protector is provided around the edges of the outer scraped layer to prevent damage to the edges of the outer scraped layer before it solidifies.
[0011] Furthermore, the inner sprayed layer and the outer scraped layer are the same non-intumescent fire-retardant coating, with the inner sprayed layer having a textured surface and the outer scraped layer having a smooth surface.
[0012] Furthermore, the inner layer of the spray coating is formed by stacking multiple X-shaped inner layer units vertically, and the inner layer unit is the spraying trajectory left by the cross-spraying spray gun.
[0013] Furthermore, the thickness ratio of the inner sprayed layer to the outer scraped layer is not less than four to one.
[0014] Furthermore, the inner corner protector is a diamond-shaped wire mesh, which is bent into long strips with an L-shaped cross-section and wrapped around the edge of the inner coating layer, and one diagonal of the grid of the diamond-shaped wire mesh is parallel to the edge of the inner coating layer.
[0015] Furthermore, the fireproof layer is divided into segments along the vertical direction, with each segment being 5 meters apart. Each segment is equipped with thickness detection points to determine whether the thickness of each part of the segment is up to standard.
[0016] Compared with the prior art, the present invention provides a regular and uniformly thick fireproof layer for square steel columns, which has the following advantages:
[0017] In this invention, the fireproof layer combines the advantages of spraying and scraping. First, a thick inner spray layer is formed by cross-spraying, and inner corner protectors are used to help shape the edges of the column. Then, an outer scraping layer is formed outside the inner spray layer to repair local defects. With the help of the inner corner protectors, regular edges are scraped out. Finally, outer corner protectors are used to protect the edges. Ultimately, only two coats are needed to achieve a regular and smooth thick fireproof layer. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of a regular and uniformly thick fireproof layer for square steel columns according to this utility model.
[0019] Figure 2This is a schematic diagram of the inner unit, showing the inner unit on one side elevation of a square steel column;
[0020] In the diagram, 1-square steel column, 2-sprayed inner layer, 21-inner layer unit, 3-scraped outer layer, 4-inner corner protector mesh, 5-outer corner protector. Detailed Implementation
[0021] like Figure 1 As shown, a regular and uniformly thick fireproof layer for square steel columns includes a sprayed inner layer 2 attached to the square steel column 1, and a sprayed inner layer 2 wrapped around the sprayed inner layer 2 and used to treat local unevenness defects formed during the spraying process. The thickness of the sprayed inner layer 2 is greater than that of the scraped outer layer 3.
[0022] The inner layer 2, which is the main body of the entire fireproof layer, should be sprayed as thickly as possible, provided that the outer layer 3 can repair its surface defects. The defects on the surface of the inner layer 2 refer to the depressions at the joints of the inner layer units 21 during the spraying process.
[0023] An inner corner mesh 4 is provided between the inner sprayed layer 2 and the outer scraped layer 3 to assist in shaping and prevent cracking at the edges of the fireproof layer. The inner corner mesh 4 wraps around the edges of the inner sprayed layer 2 and is embedded in the inner sprayed layer 2.
[0024] The inner layer 2 is a very thick coating applied in one coat, which cures very slowly. When the outer layer 3 is applied, its edges are still soft and irregular. If the outer layer 3 is applied directly on top, it's difficult to create neat edges, and cracking is likely to occur in these areas after application. Therefore, inner corner mesh 4 is placed on the edges of the inner layer 2 to aid in shaping. Note that a complete wire mesh layer should not be placed between the two coating layers; it should only be placed on the edges. Because the square steel column 1 in this invention is square, placing a complete wire mesh layer on its surface would easily cause warping, damaging the outer layer 3.
[0025] The edges of the outer layer 3 are covered with outer corner protectors 5 to prevent damage to the edges of the outer layer 3 before it hardens. Since the entire fireproof layer is still soft after application, it is easily deformed by slight impacts. This would not be necessary if the existing method of applying six layers were followed. In this embodiment, the outer corner protectors 5 are PVC plastic components similar to angle iron.
[0026] The inner spray layer 2 and the outer scrape layer 3 are both made of the same non-intumescent fire-retardant coating (if they are not the same, the two layers may not bond well). The surface of the inner spray layer 2 is textured, while the surface of the outer scrape layer 3 is smooth. The textured surface of the inner spray layer 2 allows for effective bonding with the outer scrape layer 3.
[0027] like Figure 2 As shown, the inner layer 2 is formed by stacking multiple X-shaped inner layer units 21 vertically. The inner layer unit 21 is the spraying trajectory left by the cross-spraying spray gun.
[0028] In this embodiment, since the inner layer 2 is an ultra-thick paint layer sprayed in one go, conventional spraying methods might cause the paint to flow downwards, resulting in uneven thickness. This spraying method avoids this problem and also facilitates the subsequent scraping process. Because the paint layer formed by this spraying method has the thinnest point at the center of the rhombus grid, while the surrounding areas have a uniform thickness, scraping is easier as the surrounding areas serve as a reference, resulting in a uniform paint layer overall. Furthermore, the scraped paint essentially fills in the depressions, ensuring a very strong bond between the two paint layers. Note that the inner layer unit 21 does not have strict shape requirements and is not required to be sprayed in a strict linear pattern. In actual construction, the inner layer 2 is still sprayed as a continuous layer of paint, only the center of the rhombus grid is thinner.
[0029] The thickness ratio of the inner spray layer 2 to the outer layer 3 should not be less than four to one. This is because if the outer layer 3 is too thick, it will be difficult to control the overall thickness, resulting in a fireproof layer that is worse than that achieved by simply spraying.
[0030] The inner corner mesh 4 is a diamond-shaped wire mesh, that is, a wire mesh with a diamond-shaped grid. The diamond-shaped wire mesh is bent into long strips with an L-shaped cross-section and wrapped around the edge of the inner spray layer 2. One diagonal of the grid of the diamond-shaped wire mesh is parallel to the edge of the inner spray layer 2.
[0031] The inner corner protector mesh 4 is very soft, and if a conventional square wire mesh is used, it is difficult to maintain a shape similar to angle steel. Using a diamond-shaped wire mesh and controlling the bending points along the diagonal allows it to largely maintain a shape similar to angle steel, even though it is softer. Of course, a stiffer wire mesh could achieve the same effect, but this would be more expensive and might make it unsuitable for use in paint layers due to the excessive thickness of the wire.
[0032] The fireproof layer is set in sections along the vertical direction, with each section being 5 meters apart. Each section is equipped with thickness detection points to determine whether the thickness of each part of the section is up to standard.
[0033] In this embodiment, the fireproof layer has fewer layers and is relatively soft. Even with the various methods described above, it is more prone to uneven thickness compared to conventional brushing methods. Therefore, it is necessary to apply the coating section by section, checking the thickness after each section.
[0034] This utility model discloses a thick fireproof layer for square steel columns that is regular and has a uniform thickness. The construction method includes the following steps:
[0035] Step 1: Apply cross-spraying to the square steel column 1 to form the inner spray layer 2.
[0036] Step 2: Install the inner corner guard 4 at the edge of the inner layer 2;
[0037] Step 3: Apply a scraping coating to form the outer layer 3, and install outer corner protectors 5 at the edges of the outer layer 3.
[0038] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. A thick fireproof layer for regular and uniformly thick square steel columns, characterized in that: It includes a sprayed inner layer (2) that is attached to the square steel column (1), and a sprayed inner layer (2) that is wrapped around the sprayed inner layer (2) and used to treat local unevenness defects formed during the spraying process. The thickness of the sprayed inner layer (2) is greater than that of the scraped outer layer (3). An inner corner guard (4) is provided between the inner sprayed layer (2) and the outer scraped layer (3) to assist in shaping and prevent cracking at the edge of the fireproof layer. The inner corner guard (4) wraps around the edge of the inner sprayed layer (2) and is embedded in the inner sprayed layer (2). The edge of the outer scraped layer (3) is wrapped with an outer corner guard (5) to prevent damage to the edge of the outer scraped layer (3) before it solidifies.
2. The thick fireproof layer for regular and uniformly thick square steel columns according to claim 1, characterized in that: The inner sprayed layer (2) and the outer scraped layer (3) are the same non-intumescent fireproof coating. The surface of the inner sprayed layer (2) is rough, and the surface of the outer scraped layer (3) is smooth.
3. The thick fireproof layer for regular and uniformly thick square steel columns according to claim 2, characterized in that: The inner layer (2) is formed by stacking multiple X-shaped inner layer units (21) vertically. The inner layer unit (21) is the spraying trajectory left by the cross-spraying spray gun.
4. The thick fireproof layer for regular and uniformly thick square steel columns according to claim 2, characterized in that: The thickness ratio of the inner sprayed layer (2) to the outer scraped layer (3) is not less than four to one.
5. The thick fireproof layer for regular and uniformly thick square steel columns according to claim 1, characterized in that: The inner corner guard (4) is a diamond-shaped wire mesh. The diamond-shaped wire mesh is bent into a long strip with an L-shaped cross section and wrapped around the edge of the inner spray layer (2). One diagonal of the grid of the diamond-shaped wire mesh is parallel to the edge of the inner spray layer (2).
6. The thick fireproof layer for regular and uniformly thick square steel columns according to claim 1, characterized in that: The fireproof layer is divided into segments along the vertical direction, with each segment being 5 meters apart. Each segment is equipped with thickness detection points to determine whether the thickness of each part of the segment is up to standard.