A coating composite structure of a non-intumescent fireproof coating for steel structure

Abstract

The utility model discloses a kind of coating composite structures of non-intumescent steel structure fireproof paint, including steel structure base layer, steel structure base layer outer wall is coated with fireproof paint, from inside to outside is coated for primer layer, non-intumescent fireproof coating and finish layer in order, the steel structure base layer surface has peg vertically array, non-intumescent fireproof coating is sprayed with multiple layers, one layer of hanging net is laid before each layer is sprayed.The utility model discloses a kind of coating composite structures of non-intumescent steel structure fireproof paint, peg is arrayed on the surface of steel structure base layer, peg adopts the ridge structure of gradually increasing outward from small inner side dimension, forms progressive support, each layer of paint has support, can better support the effect of fireproof coating.And when the inclination angle of ridge increases, structural stiffness increases, long-term support is not prone to stress deformation, and shear capacity is strong.

Description

Technical Field

[0001] This utility model relates to the field of fire protection technology, specifically to a composite coating structure for a non-intumescent fire-retardant coating for steel structures. Background Technology

[0002] Non-intumescent fire-retardant coatings for steel structures are fire-retardant coatings with inorganic materials as the main component, typically composed of inorganic binders such as gypsum and cement, refractory fibers, lightweight insulating aggregates, and functional additives. Relying on its low thermal conductivity and high thermal stability, it forms a dense insulating protective layer that continuously blocks heat transfer to the steel, thereby slowing down the rate of temperature rise in the steel structure.

[0003] Existing fire-retardant coating structures are generally formed by applying fire-retardant coatings to the outer walls of steel structures. Because fire-retardant coatings are fluid when not bonded, they have poor adhesion and insufficient bonding strength. In particular, inorganic film-forming materials (cement-based / gypsum-based) generally have poor bonding strength and are prone to brittle failure at high temperatures.

[0004] This case arose in order to resolve the aforementioned issues. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a composite coating structure for a non-intumescent fireproof coating for steel structures, thus solving the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a composite coating structure of a non-intumescent fireproof coating for steel structures, comprising a steel structure base layer, wherein the outer wall of the steel structure base layer is coated with a fireproof coating, and the coating is applied sequentially from the inside to the outside as a primer layer, a non-intumescent fireproof coating layer and a topcoat layer, wherein the surface of the steel structure base layer is vertically arrayed with pins, and the non-intumescent fireproof coating is sprayed in multiple layers, with a layer of mesh laid before each layer is sprayed.

[0007] Preferably, the insert adopts a frustum structure with a small inner axial dimension and gradually expanding outwards.

[0008] Preferably, the length of the pin penetrates the coating thickness and extends 5-10mm beyond the mesh.

[0009] Preferably, the spacing between two adjacent pins is 200-300mm, and the number of pins installed per square meter is 20.

[0010] Preferably, the outer edge of the steel structure base layer is welded with a post, and a corresponding insertion hole is opened on the side of the mesh. After the post is inserted into the mesh insertion hole, the multi-layer mesh is uniformly fixed.

[0011] After adopting the above technical solution, this utility model has the following advantages compared with the prior art: The composite coating structure of this utility model for non-expansive fireproof coatings for steel structures involves welding inserts to the outer edge of the steel structure base layer and correspondingly opening insertion holes on the side of the mesh. Inserting the inserts secures the multiple layers of mesh, thus forming a unified force-bearing structure for the multiple fireproof coating layers. Simultaneously, an array of pins is inserted on the surface of the steel structure base layer. These pins employ a truncated pyramid structure with a small inner axial dimension and gradually expanding outwards, forming a progressive support. Each coating layer has support, providing better support for the fireproof coating. Furthermore, as the angle of the truncated pyramid increases, the structural stiffness increases accordingly, making it less prone to deformation under stress during long-term support and exhibiting strong shear resistance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a schematic diagram of the upper cross-section of the present invention; Figure 3 This is a schematic diagram of the hanging mesh structure in this utility model.

[0013] In the diagram: 1. Steel structure base layer; 2. Primer layer; 3. Fireproof coating; 4. Topcoat layer; 5. Wire mesh; 6. Insertion hole; 7. Insertion post; 8. Insertion nail. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1-3 As shown: A composite coating structure of a non-intumescent fireproof coating for steel structures includes a steel structure base layer 1, with vertically welded studs 8 on the surface of the steel structure base layer 1, and a fireproof coating applied to the outer wall of the steel structure base layer 1. The coating is applied sequentially from the inside to the outside as a primer layer 2, a non-intumescent fireproof coating layer 3, and a topcoat layer 4. The non-intumescent fireproof coating layer 3 is sprayed in multiple layers, with a layer of wire mesh 5 laid before each layer is sprayed.

[0016] Considering that the position of the pin 8 and the opening position of the mesh 5 are difficult to match perfectly, the mesh 5 can only be roughly fitted onto the pin 8 for support, which is prone to displacement. Therefore, the pin 7 is welded to the outer edge of the steel structure base 1, and the corresponding pin hole 6 is opened on the side of the mesh 5. After the pin 7 is inserted, the multi-layer mesh 5 is uniformly fixed, so that the multi-layer fireproof coating layer forms an integrated force.

[0017] The insert 8 adopts a frustum structure with a small inner axial dimension and gradually widening outwards, forming a progressive support. Each layer of coating is supported, which can better support the fireproof coating 3. Moreover, as the angle of the frustum increases, the structural stiffness increases accordingly, and it is not easy to undergo stress deformation under long-term support, with strong shear resistance.

[0018] Construction process: 1. Welding studs 8: Vertically weld studs 8 (spacing 200-300mm, approximately 20 studs / m²) onto the surface of the steel structure base layer 1. 2. Laying the wire mesh 5: After tensioning the galvanized iron wire mesh, fix it on the pins 8 and construct in layers: 3. Spray / apply fire-retardant coating and cover the mesh 5; after initial setting, lay the mesh 5 again and continue spraying the coating in layers until the designed thickness is reached (each layer of coating should not exceed 10mm to avoid excessive weight causing sagging and cracking). The length of the nails 8 should penetrate the coating thickness and extend 5-10mm beyond the mesh.

[0019] The fire-retardant coating is applied in the following order: primer layer 2, fire-retardant coating layer 3, and topcoat layer 4. The steel structure base layer 1 uses steel beams (treated for rust and oil removal); the fire-retardant coating (using conventional coatings, no modifications are made in this embodiment) is applied in the following order: rust-proof and anti-corrosion primer layer 2 --> non-intumescent fire-retardant coating layer 3 (main structural layer) --> topcoat layer.

[0020] The non-intumescent fire-retardant coating 3 requires multiple layers of spraying to achieve the designed thickness, with each layer controlled at 5-10mm, and sufficient drying time allowed. The mesh 5, laid within the non-intumescent fire-retardant coating 3, serves to reinforce it.

[0021] Fire-retardant coatings can use hydroxide-based flame retardants, such as aluminum hydroxide, with a decomposition temperature of 200-300℃. (Reaction formula:) It releases a large amount of water vapor while absorbing a large amount of heat.

[0022] The above-described embodiments are provided for illustrative purposes. Based on the above description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this utility model is not limited to the contents of the specification; its protection scope must be determined according to the claims.

Claims

1. A composite coating structure for a non-intumescent fire-retardant coating on steel structures, comprising a steel structure base layer, wherein the outer wall of the steel structure base layer is coated with a fire-retardant coating, and the coating is applied sequentially from the inside out as a primer layer, a non-intumescent fire-retardant coating layer, and a topcoat layer, characterized in that: The steel structure base surface has vertically arranged pins, and the non-intumescent fireproof coating is sprayed in multiple layers, with a layer of wire mesh laid before each layer is sprayed.

2. The coating composite structure of a non-intumescent fireproof coating for steel structures according to claim 1, characterized in that: The insert adopts a frustum structure with a small inner axial dimension and gradually expanding outwards.

3. The coating composite structure of a non-intumescent fireproof coating for steel structures according to claim 1, characterized in that: The length of the pin penetrates the coating thickness and extends 5-10mm beyond the mesh.

4. The coating composite structure of a non-intumescent fireproof coating for steel structures according to claim 1, characterized in that: The spacing between two adjacent pins is 200-300mm, and the number of pins installed per square meter is 20.

5. The coating composite structure of a non-intumescent fireproof coating for steel structures according to claim 1, characterized in that: The outer edge of the steel structure base is welded with a column, and a corresponding insertion hole is opened on the side of the mesh. After the column is inserted into the mesh insertion hole, the multi-layer mesh can be uniformly fixed.

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