A steel structure staircase floor with washed stone structure

Abstract

This application proposes a washed stone structure for steel structure staircase floors, comprising a steel structure staircase and a washed stone composite layer. The steel structure staircase includes risers and treads, both of which are covered with the washed stone composite layer. The washed stone composite layer, from bottom to top, consists of an anti-rust paint layer, a cement-based interface agent layer, a washed stone layer, and a washed stone topcoat layer. This application constructs a synergistic protection system adapted to both the steel structure substrate and the cement-based decorative surface layer through layered design and functional optimization of the washed stone composite layer. By setting the anti-rust paint layer, cement-based interface agent layer, washed stone layer, and washed stone topcoat layer, this application isolates air and moisture from reacting with the steel structure, while also preventing interface separation caused by stress concentration, avoiding hollow areas and delamination, ensuring the flatness and safety of the staircase floor, and achieving the effect of "rust-free, hollow-free, non-detaching, pollution-resistant, and long-lasting" for the steel structure staircase washed stone floor.

Description

Technical Field

[0001] This application relates to the field of steel structure staircase building structure technology, and in particular to a steel structure staircase floor washed stone structure. Background Technology

[0002] Washed stone, as a building decoration material that blends natural aesthetics with modern functionality, has gained widespread application in landscape design and architectural decoration in recent years. Installing washed stone on steel structure staircases requires special attention to construction techniques because it combines two materials with vastly different properties: a metal substrate and a cement-based decorative surface. Steel has a smooth surface and a high coefficient of thermal expansion, while the cement base of washed stone has strong shrinkage, making it prone to delamination, cracking, and delamination due to temperature deformation or vibration. Furthermore, moisture during washed stone construction may seep into the steel substrate, causing corrosion and expansion of the steel structure, ultimately cracking the washed stone surface. These quality issues significantly impact the aesthetics and flatness of the washed stone staircase floor.

[0003] Therefore, developing a steel structure staircase floor with washed stone surface that can effectively solve the above-mentioned technical problems, achieve a stable bond between the steel structure substrate and the washed stone surface layer, and has both excellent durability and aesthetics has become an urgent technical need to be addressed in this field. Utility Model Content

[0004] In view of this, this application proposes a washed stone structure and construction method for steel structure staircase flooring, aiming to solve the problems of easy hollowing, delamination, cracking and corrosion that occur when washed stone is used on steel structure staircase floors.

[0005] To achieve the above objectives, this application provides a steel structure staircase floor washed stone structure, including a steel structure staircase and a washed stone composite layer. The steel structure staircase includes a riser and a tread, both of which are provided with a washed stone composite layer. The washed stone composite layer consists of, from bottom to top, an anti-rust paint layer, a cement-based interface agent layer, a washed stone layer, and a washed stone topcoat layer.

[0006] Preferably, a wire mesh is also laid between the washed stone layer and the cement-based interface agent layer, and the wire mesh is fixed to the steel structure staircase by binding or welding.

[0007] Preferably, the wire mesh aperture is less than or equal to 20 mm, and the wire mesh is welded or tied to the steel structure staircase. If welding is used, the weld points are treated with rust prevention; if tying is used, galvanized iron wire with a diameter of not less than 1 mm is used for tying, and the tying interval is not greater than 200 mm.

[0008] Preferably, the anti-rust paint layer consists of a first epoxy zinc-rich primer, a second epoxy zinc-rich primer, and a polyurethane topcoat, from bottom to top.

[0009] Preferably, a stainless steel corner guard is provided at the external corner where the skirting connects to the washed stone layer of the tread.

[0010] Preferably, an expansion joint is provided at the inside corner of the washed stone composite layer where the riser connects to the tread. The expansion joint penetrates the washed stone composite layer of the tread and extends to the steel structure surface of the steel structure staircase. The expansion joint is filled with polyurethane foam strips and elastic sealant from bottom to top. The surface of the elastic sealant is flush with the washed stone topcoat layer. The edges of the washed stone composite layer on both sides of the expansion joint are chamfered and coated with washed stone topcoat paint.

[0011] Preferably, the tread surface is provided with spaced anti-slip ridges, the bottom of the anti-slip ridges is embedded with galvanized steel wire and welded to the steel structure staircase, the top of the anti-slip ridges protrudes and forms a ridge on the tread surface, the anti-slip ridges extend along the length of the tread surface, and drainage grooves are provided on the anti-slip ridges at intervals.

[0012] Preferably, the cement-based interface agent is prepared by mixing silicate cement, sand, water, surfactant, styrene-butadiene emulsion, curing agent, and adhesion promoter in a weight ratio of 400:600:220:40:60:50:20.

[0013] Preferably, the washed stone layer is formed by the solidification of washed stone polymer cement mortar, which includes cement, sand, polymer emulsion, water, and gravel, wherein the mass ratio of cement to sand is 1:2, and the polymer emulsion is one of vinyl acetate emulsion, acrylic emulsion, and styrene-butadiene rubber emulsion.

[0014] Preferably, the water-washed stone topcoat layer consists of two layers of water-based acrylic topcoat.

[0015] The beneficial effects of this application are:

[0016] This application constructs a collaborative protection system adapted to both steel structure substrates and cement-based decorative surfaces by implementing a layered design and functional optimization of the washed stone composite layer. By setting up an anti-rust paint layer, a cement-based interface agent layer, a washed stone layer, and a washed stone topcoat layer, this application isolates the steel structure from air and moisture, preventing reactions and stress concentration-induced interface separation. This avoids hollow areas and delamination, ensuring the flatness and safety of the staircase floor, and achieving the desired performance of "rust-free, hollow-free, non-detaching, pollution-resistant, and long-lasting" washed stone for steel structure staircases. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a steel structure staircase floor washed stone structure according to this application;

[0019] Figure 2 This is a partially enlarged schematic diagram of a steel structure staircase floor washed stone structure according to this application;

[0020] Figure 3 This is a schematic diagram of a steel structure staircase floor with a washed stone structure, featuring expansion joints and anti-slip raised strips, as described in this application.

[0021] Figure 4 This is a partially enlarged schematic diagram of the expansion joint of a steel structure staircase floor washed stone structure according to this application;

[0022] Figure 5 This is a top view of the tread surface of a steel structure staircase with a washed stone floor structure according to this application;

[0023] Figure 6 This is a construction process diagram of a steel structure staircase floor washed stone structure according to this application.

[0024] In the picture:

[0025] 1-Steel structure staircase; 11-Riser; 12-Tread;

[0026] 2-Water-washed stone composite layer; 21-Rust-preventive paint layer; 22-Cement-based interface agent layer; 23-Wire mesh; 24-Water-washed stone layer; 25-Water-washed stone topcoat layer;

[0027] 3-Stainless steel corner guard; 4-Expansion joint; 5-Polyurethane foam strip; 6-Elastic sealant; 7-Anti-slip raised strip; 8-Drainage groove. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Example 1

[0032] refer to Figure 1-2 The present invention discloses a steel structure staircase 1 with a washed stone floor structure, including a steel structure staircase 1 and a washed stone composite layer 2. The steel structure staircase 1 includes a riser 11 and a tread 12. The feature is that both the riser 11 and the tread 12 are provided with a washed stone composite layer 2. The washed stone composite layer 2 consists of a rust-proof paint layer 21, a cement-based interface agent layer 22, a washed stone layer 24, and a washed stone topcoat layer 25 from bottom to top.

[0033] The steel structure staircase 1 is the load-bearing foundation. Its structural form conforms to the conventional design of indoor staircases in buildings. Specifically, it includes interconnected risers 11 and treads 12. The risers 11 are set perpendicular to the ground to separate the height difference between adjacent steps, while the treads 12 are set horizontally and serve as the main area for people to step on. The washed stone composite layer 2 mainly realizes the functions of decoration and protection. The surface of the risers 11 and treads 12 of the steel structure staircase 1 is completely covered by this composite layer. The composite layer adopts a "layered stacking from bottom to top" structural design. From the side closest to the steel structure staircase 1 to the outermost side, it consists of a rust-proof paint layer 21, a cement-based interface agent layer 22, a washed stone layer 24, and a washed stone topcoat layer 25. The layers are tightly bonded to each other to form an integrated protection and decoration system.

[0034] Among them, the anti-rust paint layer 21, as the first layer in direct contact with the steel structure staircase 1, has the core function of blocking the contact path between corrosive media and steel, thus protecting the steel structure substrate from the source. In this embodiment, the anti-rust paint layer 21 includes a layered design of a first epoxy zinc-rich primer, a second epoxy zinc-rich primer, and a polyurethane topcoat, which together form a multi-layered and dense paint film structure.

[0035] The two-layer epoxy zinc-rich primer has extremely low porosity, effectively preventing moisture from cement-based materials and indoor humidity from penetrating to the steel surface during the construction of washed stone. The polyurethane topcoat further enhances the barrier effect while resisting damage to the primer from minor daily friction, preventing the formation of "corrosion channels" due to paint film damage. The high zinc powder content in the epoxy zinc-rich primer has excellent cathodic protection properties. When minor damage occurs in the paint film and the steel is exposed to a corrosive environment, the zinc powder will preferentially undergo oxidation reaction with the steel, forming an electrochemical system of "sacrificial anode protecting the cathode," preventing steel corrosion, compensating for the inadequacy of physical barriers, and extending the service life of the steel structure.

[0036] The polyurethane topcoat not only serves as the outer protective layer of the rust barrier but also acts as a transitional interface with the cement-based interface agent layer 22. The smooth surface of steel results in extremely low bonding strength when directly bonded to cement-based materials; however, the polyurethane topcoat possesses a certain degree of roughness and polarity, enabling it to form a molecular-level bond with the cement-based interface agent layer 22. This prevents overall delamination due to weak interfacial adhesion during subsequent construction, providing a stable foundation for the upper structure.

[0037] The cement-based interface agent layer sits on top of the anti-rust paint layer. Its main function is to address the material differences between the anti-rust paint layer and the washed stone layer, enhance interlayer adhesion, and prevent delamination. The cement-based interface agent is prepared by mixing the following weight ratios: silicate cement 400: sand 600: water 220: surfactant 40: styrene-butadiene emulsion 60: curing agent 50: adhesion promoter 20. The specific steps are as follows: First, stir the dry powder materials (cement and sand) evenly. Then, add the liquid materials (water, surfactant, styrene-butadiene emulsion, curing agent, and adhesion promoter). Stir with an electric mixer for 3-5 minutes to ensure there are no lumps and a uniform paste is formed.

[0038] The washed stone layer serves as the main decorative layer, providing the visual effect of natural stone and a durable, wear-resistant surface. The washed stone layer is formed by the solidification of washed stone polymer cement mortar. The mortar is prepared according to a cement:sand ratio of 1:2, with the addition of appropriate amounts of polymer emulsion (such as vinyl acetate emulsion, acrylic emulsion, styrene-butadiene rubber emulsion, etc.), water, and gravel. It is then mixed for 5-8 minutes using a forced mixer to ensure uniform mortar and consistent gravel dispersion.

[0039] The topcoat layer for washed stone is located on the outermost layer and mainly serves to prevent staining, resist wear, protect the washed stone layer, and extend its decorative life. The preferred topcoat layer for washed stone is two layers of water-based acrylic topcoat.

[0040] refer to Figure 6 The construction steps of this application are as follows:

[0041] Step 1, Surface preparation. Use sandblasting to remove impurities from the surface of the steel staircase 1 until the metal is exposed. Use clean compressed air or a brush to remove the dust after sandblasting, and wipe with cleaning solvent to remove any oil residue.

[0042] Step 2: Apply anti-rust primer. Apply the anti-rust primer evenly to the clean, dry surface of the steel staircase 1 until it is completely cured and dry, forming an anti-rust paint layer 21. This step involves applying the anti-rust paint in layers to form a dense anti-rust paint layer 21. The specific operation is as follows:

[0043] On a clean, dry steel substrate, apply an epoxy zinc-rich primer (zinc content ≥60%) evenly using a roller or spray gun. After the first coat of epoxy zinc-rich primer, cure according to the product instructions until the primer is completely cured and no longer sticky to the touch. Then apply the second coat of epoxy zinc-rich primer, following the same application requirements as the first coat. In this embodiment, the total dry film thickness after the two primer coats are applied is 70-110 μm. After the second primer is completely cured, apply a polyurethane topcoat evenly, ensuring it covers the entire primer surface to form a smooth, non-porous protective film. Cure until completely dry, ultimately forming a rust-preventive paint layer 21 consisting of "two coats of epoxy zinc-rich primer + one coat of polyurethane topcoat".

[0044] Step 3, apply interface agent. Apply cement-based interface agent evenly to the cured and dried anti-rust paint layer 21 to form cement-based interface agent layer 22.

[0045] During application, use a brush or roller to evenly apply the cement-based interface agent to the surface of the anti-rust paint layer 21. Apply a thicker layer at the corners of the skirting surface 11 and tread surface 12 to ensure complete coverage without any missed areas. After application, keep the interface agent moist or in a partially set state. If the environment is dry, spray with water to maintain moisture and prevent premature drying, which could reduce adhesion.

[0046] If wire mesh is required, a mesh hanging step is also included. After applying cement-based interface agent and keeping it moist, wire mesh 23 is laid on the riser 11 and tread 12 of the steel structure staircase 1 as a mortar base skeleton.

[0047] Step 4: Attach the dividing strips to the baseboard joints of the steel structure staircase 1. Cut PVC or wooden dividing strips to the correct length, matching the width of the tread 12, based on the baseboard height and number of steps. Use a special dividing strip adhesive to secure the dividing strips at the baseboard joints, ensuring they are vertical, flat, and tightly adhered to the base layer without any looseness.

[0048] Step 5, Water-washed stone construction: Prepare water-washed stone polymer cement mortar. When the cement-based interface agent layer 22 is moist or initially set, spread and press the water-washed stone polymer cement mortar onto the cement-based interface agent layer 22, and repeatedly press it with a trowel. For the skirting surface 11, ensure that the mortar is tightly bonded to the steel plate to avoid hollow areas.

[0049] If stainless steel corner guards 3 are required, they should be installed in this step. During the paving and compaction process, stainless steel corner guards 3 are simultaneously laid at the external corner where the riser 11 and tread 12 meet. The corner guards are adjusted to be horizontal and vertical, and the mortar is compacted with a trowel to ensure that the corner guards are tightly bonded to the mortar without any looseness.

[0050] When the surface layer of water-washed stone polymer cement mortar has initially set, it will feel slightly hard when pressed with a finger, but the cement mortar can be scratched with a fingernail. At this point, water washing can begin. Use a water gun to evenly rinse the steel structure staircase 1 from top to bottom at an angle, washing away the surface laitance and exposing approximately 1 / 3 to 1 / 2 of the stone's diameter, making it clearly visible, evenly distributed, and with a clean surface. After the water-washed stone polymer cement mortar hardens, it forms a water-washed stone layer 24.

[0051] Preferably, when rinsing with a water gun, the surface should be gently wiped with a sponge to help remove laitance and adjust the degree of stone exposure. If too many stones fall off in a certain area, repair and smooth it with the same proportion of the water-washed stone polymer cement mortar, and wash the area again after the water has dried.

[0052] After washing, the mortar is cured at 25°C for a period of time to allow it to solidify and form a preliminary strength that is free from flow and loosening.

[0053] Step 6: Remove the dividing strip. After washing is complete and the washed stone polymer cement mortar has set but not yet fully hardened, remove the dividing strip from the skirting board joint. This step must be performed after the mortar has set but before it is fully hardened to avoid the dividing strip being too tightly bonded to the mortar, making removal difficult.

[0054] Step 7, Curing. Use a sprayer to evenly spray water onto the washed stone layer 24 to keep the surface moist, and cover it with a film for 7 days or more. Press the edges of the film firmly with a heavy object to prevent moisture evaporation. This step, through moisturizing curing, ensures that the washed stone layer 24 fully hardens, improving its strength and durability.

[0055] Preferably, after curing and before applying the topcoat, the baseboard joints can be sealed. First, use a vacuum cleaner or brush to remove dust and debris from the joints. If there is loose mortar, remove it with a knife, ensuring the joints are dry and clean. Then, use a caulking gun to evenly embed neutral silicone structural adhesive into the joints, ensuring the adhesive layer thickness matches the joint width. After embedding, use a scraper to smooth the adhesive surface, ensuring a tight bond between the adhesive and both sides of the joint, without air bubbles or gaps. Finally, wait for the silicone structural adhesive to fully cure, forming a waterproof sealant layer to prevent moisture from seeping into the joints.

[0056] Step 8, Topcoat Application. Apply a topcoat to the clean, firm, and dry washed stone layer 24 to form a washed stone topcoat layer 25. This step protects the washed stone layer 24 by applying the topcoat. Specific steps are as follows:

[0057] Substrate preparation: After the silicone structural adhesive has fully cured, wipe the surface of the water-washed stone layer 24 with a damp cloth to remove dust and stains, ensuring that the surface is clean, firm and dry.

[0058] First coat of topcoat: Use water-based acrylic topcoat and apply evenly with a spray gun or roller, using a "W" or "M" pattern. Finally, gently smooth the coat in the same direction (clockwise or counterclockwise). Avoid drips and missed areas during application, and pay special attention to corners and seams. After the first coat of topcoat, allow it to dry completely until it is ready for recoating (no stickiness to the touch, and no scratches on the paint film).

[0059] Second coat of topcoat: Apply the second coat of topcoat using the same method. After application, allow it to cure completely to form a transparent and wear-resistant protective film.

[0060] Example 2

[0061] refer to Figure 2 To enhance the bonding strength between the washed stone layer 24 and the cement-based interface agent layer 22, and to prevent localized cracking of the washed stone layer 24 due to uneven stress, this embodiment, based on Embodiment 1, further incorporates a wire mesh 23 between the washed stone layer 24 and the cement-based interface agent layer 22. The wire mesh 23 can disperse the shrinkage stress during the hardening process of the washed stone layer 24, preventing cracks caused by uneven shrinkage. It also enhances the overall tensile strength of the washed stone layer 24. When the structure is subjected to vibration or localized loads, the wire mesh 23 can transfer stress to a wider area, preventing localized cracking and peeling of the washed stone layer 24.

[0062] The wire mesh 23 is preferably made of fine wire mesh with a mesh size of 20 mm or less. In this embodiment, the mesh size is 10 mm × 10 mm, which has good tensile strength and bending performance and can adapt to the corner curvature of the riser 11 and tread 12 of the steel structure staircase 1. To ensure a stable connection between the wire mesh 23 and the steel structure staircase 1 and to avoid displacement during later use, the wire mesh 23 is fixed to the steel structure staircase 1 by binding or welding: when binding, galvanized iron wire with a diameter of not less than 1 mm is selected, and the binding spacing is not greater than 200 mm; when welding, spot welding is selected, the weld point spacing is not greater than 300 mm, and the weld points need to be rust-proofed, such as by applying anti-rust paint to prevent local corrosion.

[0063] Furthermore, stainless steel corner guards 3 are installed at the external corner where the riser 11 connects to the washed stone layer 24 of the tread 12. The external corner where the riser 11 and tread 12 of the steel structure staircase 1 connect is a weak point of the washed stone layer 24. Long-term exposure to foot traffic (such as kicks from toes) and the handling of items (such as impacts from the corners of boxes) can easily lead to corner damage and stone detachment. The stainless steel corner guards 3 (made of 304 / 316 steel, with strong corrosion resistance) are fitted to the corner in an "L" shape. Their high strength (yield strength ≥200MPa) can directly resist external impacts, dispersing the impact force to the corner guard itself and preventing direct damage to the corners of the washed stone layer 24. Simultaneously, the corner guards are embedded inside the washed stone layer 24, strengthening the structural integrity at the corners and preventing delamination and detachment due to weak adhesion, thus ensuring the integrity and aesthetics of the structural corners.

[0064] Example 3

[0065] refer to Figure 3-4 In this embodiment, an expansion joint 4 is provided at the inside corner where the riser 11 connects to the washed stone composite layer 2 of the tread 12. The expansion joint 4 penetrates the washed stone composite layer 2 of the tread and reaches the steel structure surface of the tread 12 of the steel structure staircase 1. The expansion joint 4 is filled with polyurethane foam strips 5 and elastic sealant 6 from bottom to top. The surface of the elastic sealant 6 is flush with the washed stone topcoat layer 25, and the edges of the washed stone composite layer 2 on both sides of the expansion joint 4 are chamfered and coated with washed stone topcoat paint.

[0066] The inner corner, specifically the corner on the inside of the stair tread, is the area where stress is most concentrated due to temperature deformation and material shrinkage between the steel structure and the washed stone composite layer 2. The expansion joint 4 must penetrate the washed stone composite layer of the tread and reach the surface of the steel structure to effectively release the deformation stress of the entire composite layer and prevent cracking of the washed stone layer due to stress accumulation.

[0067] Expansion joint 4 uses a composite filling method of "polyurethane foam strip + elastic sealant". The bottom polyurethane foam strip 5 acts as a buffer and support, and its elasticity can adapt to minor structural deformations, while preventing the upper sealant from sinking due to gravity. The upper elastic sealant 6 forms a waterproof barrier, preventing moisture from seeping into the steel structure, and is required to be "flush with the washed stone topcoat" to ensure surface flatness and aesthetics.

[0068] The edges of the washed stone layer on both sides of expansion joint 4 are beveled and additionally coated with washed stone topcoat paint. This is to prevent cracking due to stress concentration at the right-angled edges, enhance edge impermeability, and further protect the base structure.

[0069] Example 4

[0070] like Figure 3 , 5 As shown, in this embodiment, the tread surface 12 is provided with anti-slip ridges 7 spaced apart. The bottom of the anti-slip ridges 7 is embedded with galvanized steel wire and welded to the steel structure staircase. The top of the anti-slip ridges 7 protrudes and forms a ridge on the tread surface 12. The anti-slip ridges 7 extend along the length of the tread surface, and drainage grooves 8 are provided on the anti-slip ridges 7 spaced apart.

[0071] The anti-slip raised strip 7 extends along the length of the tread surface, forming horizontal raised stripes. This physical protrusion increases the friction between the foot and the tread surface, achieving an anti-slip effect. A galvanized steel wire is embedded at the bottom of the anti-slip raised strip 7, and the wire is welded and fixed to the steel structure staircase, ensuring a firm connection between the raised strip and the base layer. This prevents the raised strip from breaking or falling off due to prolonged foot traffic, while the galvanized steel wire also provides anti-oxidation protection.

[0072] Drainage grooves 8 are provided at intervals on the anti-slip ridges 7. Their function is to quickly drain water from the tread area, prevent water from accumulating between the ridges, further reduce the risk of slipping, and at the same time reduce the long-term erosion of the washed stone layer by water.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A steel structure staircase floor washed stone structure, comprising a steel structure staircase and a washed stone composite layer, wherein the steel structure staircase includes risers and treads, characterized in that, Both the kick surfaces and tread surfaces are equipped with a washed stone composite layer, which consists of, from bottom to top, an anti-rust paint layer, a cement-based interface agent layer, a washed stone layer, and a washed stone topcoat layer.

2. The steel structure staircase floor washed stone structure according to claim 1, characterized in that, A wire mesh is also laid between the washed stone layer and the cement-based interface agent layer, and the wire mesh is fixed to the steel structure staircase by binding or welding.

3. The steel structure staircase floor washed stone structure according to claim 2, characterized in that, The wire mesh has an aperture of 20 mm or less. The wire mesh is welded or tied to the steel structure staircase. If welding is used, the weld points are treated with rust prevention. If tying is used, galvanized iron wire with a diameter of not less than 1 mm is used for tying, and the tying interval is not greater than 200 mm.

4. The steel structure staircase floor washed stone structure according to claim 1, characterized in that, The anti-rust paint layers, from bottom to top, are a first epoxy zinc-rich primer, a second epoxy zinc-rich primer, and a polyurethane topcoat.

5. The steel structure staircase floor washed stone structure according to claim 1, characterized in that, Stainless steel corner guards are also provided at the external corners of the washed stone layer where the skirting connects to the tread.

6. The steel structure staircase floor washed stone structure according to claim 1, characterized in that, An expansion joint is provided at the inside corner of the washed stone composite layer where the riser connects to the tread. The expansion joint penetrates the washed stone composite layer of the tread and extends to the steel structure surface of the steel structure staircase tread. The expansion joint is filled with polyurethane foam strips and elastic sealant from bottom to top. The surface of the elastic sealant is flush with the washed stone topcoat layer. The edges of the washed stone composite layer on both sides of the expansion joint are chamfered and coated with washed stone topcoat paint.

7. The steel structure staircase floor washed stone structure according to claim 1, characterized in that, The tread surface is provided with spaced anti-slip ridges. The bottom of the anti-slip ridges is embedded with galvanized steel wire and welded to the steel structure staircase. The top of the anti-slip ridges protrudes and forms a bulge on the tread surface. The anti-slip ridges extend along the length of the tread surface, and drainage grooves are provided on the anti-slip ridges at intervals.

8. The steel structure staircase floor washed stone structure according to claim 1, characterized in that, The washed stone topcoat consists of two layers of water-based acrylic topcoat.

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