Novel fire-resistant profiled steel sheet-concrete composite floor
By employing special structures and materials in profiled steel sheet-concrete composite floor slabs, fire resistance and load-bearing capacity are enhanced, solving the problem of insufficient load-bearing capacity under fire conditions and reducing the cost of fire-retardant coatings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-03-20
AI Technical Summary
Existing profiled steel sheet-concrete composite floor slabs have insufficient load-bearing capacity under fire conditions, affecting building safety and durability, and the cost of fire-retardant coatings is relatively high.
It adopts special rectangular closed-structure profiled steel sheets, increases the internal cavity area and fills it with diamond-shaped closed ribs and T-shaped closed ribs, combined with steel trusses and two-way structural steel mesh, and uses recycled coarse aggregate and specific cement materials to make concrete layers, which enhances fire resistance and reduces thermal conductivity.
It improves the fire resistance and load-bearing capacity of the composite floor slab, reduces the cost of fire-retardant coatings, and maintains the integrity and aesthetics of the building.
Smart Images
Figure CN224016599U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of construction, and particularly to the field of high-strength floor slabs, specifically a new type of fire-resistant profiled steel plate-concrete composite floor slab. Background Technology
[0002] Composite floor slabs made of profiled steel sheets and concrete are typically constructed by filling a top layer of profiled steel sheets with concrete. This combination combines the advantages of both steel and concrete structures. Compared to precast concrete floors, during construction, the profiled steel sheets not only serve as permanent formwork but also as working platforms, facilitating construction; the construction cycle is shorter, on-site operations are easier, and the overall building structure is more robust. During use, the profiled steel sheets act as a base slab, working in conjunction with the concrete to create a combined effect. Composite floor slabs of profiled steel sheets and concrete offer advantages such as high load-bearing capacity, high construction efficiency, and low cost, and are increasingly used in industrial plants and residential buildings.
[0003] However, similar to other exposed steel components, the fire resistance of steel—which is heat-resistant but not fire-resistant—is one of the key issues affecting the widespread application of profiled steel sheet-concrete composite floor slabs. Currently, commonly used profiled steel sheet types include open, narrowed, and closed types. Because the steel is directly exposed to flames, open-type composite slabs have the worst fire resistance. Closed-type composite slabs have improved fire resistance due to the concrete encasing the closed sections of the steel. Narrowed-type composite slabs have fire resistance in between. As a crucial horizontal load-bearing component in an engineering structure, floor slabs pose a serious threat to life and property if damaged by fire; therefore, they must possess sufficient fire resistance to ensure the overall safety and durability of the building. Summary of the Invention
[0004] To address the issues of insufficient load-bearing capacity of existing composite slabs under fire conditions, the higher load-bearing requirements of existing buildings for composite floor slabs, and the susceptibility of existing profiled steel sheet-concrete composite floor slabs to damage due to insufficient structural load-bearing capacity, this invention provides a novel fire-resistant profiled steel sheet-concrete composite floor slab.
[0005] This utility model provides a novel fire-resistant profiled steel sheet-concrete composite floor slab, comprising a profiled steel sheet fixed on a steel beam, T-shaped closed ribs on the profiled steel sheet, a corrugated groove between two adjacent T-shaped closed ribs, a steel truss welded in each corrugated groove, a diamond-shaped closed rib below the steel truss located in the center of the corrugated groove, a bidirectional structural steel mesh welded above the steel truss, and a concrete layer filling the profiled steel sheet, the concrete layer completely covering the bidirectional structural steel mesh and filling the gaps in the steel truss.
[0006] In implementation, it includes a profiled steel sheet fixed to a steel beam. The profiled steel sheet is fixed to the steel beam by cylindrical head studs. The cylindrical head studs pass through the profiled steel sheet and are welded to the steel beam. The cylindrical head studs fix the profiled steel sheet to the steel beam. The profiled steel sheet is provided with a T-shaped closed rib. The T-shaped closed rib includes an integrally connected upper and lower flange plates and a lateral web plate. The upper and lower flange plates include an upper flange plate and a lower flange plate connected together. The upper flange plate and the lower flange plate form a hollow space. The center of the lower flange plate is perpendicularly connected to the top of the lateral web plate. The distance between the upper flange plate and the lower flange plate is equal to the distance between the two lateral web plates. The bottom end of the lateral web plate is perpendicularly connected to the base plate of the corrugated groove, forming a T-shaped hollow space with both ends connected to the base plate of the corrugated groove. The upper and lower flange plates are located diagonally above the lower chord reinforcement.
[0007] A corrugated groove is provided between two adjacent T-shaped closed ribs. A steel truss is welded in each corrugated groove. The steel trusses are arranged in parallel and the distance between adjacent steel trusses is equal. The steel truss includes parallel top chord steel bars and bottom chord steel bars. Web steel bars are welded between the top chord steel bars and the bottom chord steel bars. The web steel bars are corrugated and are bent and welded between the top chord steel bars and the bottom of the web steel bars are located below the bottom chord steel bars and bend horizontally. The bottom bend of the web steel bars is welded to the corrugated groove of the profiled steel sheet. The top chord steel bars in the same corrugated groove are connected to two bottom chord steel bars. The top chord steel bars and the bottom chord steel bars are arranged in an equilateral triangle. The two sides of the top chord steel bars are connected to the bottom chord steel bars through their respective web steel bars. The web steel bars and the bottom chord steel bars on both sides of the top chord steel bars are arranged symmetrically.
[0008] A diamond-shaped closed rib is located in the center of the corrugated groove below the steel truss. The diamond-shaped closed rib is located directly below the top chord steel bar. A two-way structural steel mesh is welded above the steel truss. The two-way structural steel mesh includes mutually perpendicular transverse structural steel bars and longitudinal structural steel bars. The lap joints of the transverse structural steel bars and longitudinal structural steel bars are tied together. A concrete layer is filled on the profiled steel sheet. The concrete layer completely covers the two-way structural steel mesh and fills the gaps in the steel truss. The concrete layer adopts existing technology and is made of recycled coarse aggregate obtained by crushing waste concrete and slag silicate cement or high alumina cement.
[0009] This device improves the structure of profiled steel sheets by employing a special rectangular closed-loop structure to increase the internal cavity area and projected area of the composite panel, thereby enhancing its fire resistance. This is achieved by increasing the cavity area through diamond-shaped closed ribs and T-shaped closed ribs while maintaining the strength of the profiled steel sheet itself. Furthermore, air is a poor conductor of heat; the thermal conductivity of still air is approximately 0.024 W / m·K, far lower than the 1.7 W / m·K of concrete. In addition, adding relatively sealed cavities within the concrete and dividing large cavities into multiple smaller cavities reduces the possibility of convection, and the inability of air to form effective convection also inhibits temperature rise.
[0010] In use, profiled steel sheets are laid on steel beams, and cylindrical studs are welded through the profiled steel sheets above the steel beams to fix the bottom of the profiled steel sheets to the steel beams. Welded steel trusses are placed in the grooves of the profiled steel sheets. The steel bars are bent at 45° to form web reinforcement, with the bottom bends of the web reinforcement bent upwards to serve as truss supports. The top and bottom chord reinforcements are welded to the bends of the web reinforcement to form an integral steel truss. The bottom bends of the web reinforcement are welded to the grooves of the profiled steel sheets. A two-way structural steel mesh is welded above the steel truss. The two-way structural steel mesh is formed by overlapping and binding the transverse and longitudinal structural reinforcements at the overlaps. Finally, concrete is poured using recycled coarse aggregate obtained from crushed waste concrete and slag silicate cement or high-alumina cement to create a concrete layer.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] The present invention provides a novel fire-resistant profiled steel sheet-concrete composite floor slab. Through a special profiled steel sheet structure, the fire resistance of the composite slab is improved while meeting the load-bearing requirements, and the cost of fireproof coatings for the composite floor slab is reduced.
[0013] This utility model uses profiled steel sheets, which have a flat base plate, making them not only aesthetically pleasing but also increasing the building's headroom. Furthermore, compared to open-type profiled steel sheets, it enhances the bonding between the steel sheet and concrete, resulting in better overall integrity and higher load-bearing capacity.
[0014] This invention places a steel truss and steel mesh within the corrugations of a profiled steel sheet. The steel truss and mesh are positioned within a concrete slab, which improves the ductility of the concrete. The concrete, profiled steel sheet, steel truss, and steel mesh work together to bear the upper load of the composite slab. The profiled steel sheet ribs are completely encased in concrete, enhancing the composite effect and significantly improving the load-bearing capacity of the slab. The combination of the steel truss and mesh improves concrete ductility and enhances the slab's load-bearing capacity, effectively increasing the overall load-bearing capacity of this invention.
[0015] In summary, this utility model improves the fire resistance of the composite panel by adding cavities inside the panel, specifically by using a special rectangular closed structure for the profiled steel sheet and adding diamond-shaped closed openings within each corrugation. This approach not only ensures the composite panel meets load-bearing requirements but also reduces the use of fire-retardant coatings, thereby lowering costs. Attached Figure Description
[0016] Figure 1 This is a cross-sectional structural diagram of the present invention.
[0017] Figure 2 This is a schematic diagram showing the installation of this utility model.
[0018] Figure 3 A schematic diagram showing the cross-sectional structure of profiled steel sheet.
[0019] Figure 4 The diagram shows the cross-sectional views of models 1 through 4.
[0020] Figure 5 The temperature contour plots of the finite element models 1-4 after being exposed to fire for 90 minutes are shown.
[0021] Figure 6 The graph shows the temperature variation at the top of the plates in models 1 through 4.
[0022] The markings in the image are as follows:
[0023] 1. Corrugated steel sheet; 2. Steel beam; 3. Column head studs; 4. Top chord reinforcement; 5. Bottom chord reinforcement; 6. Web reinforcement; 7. Concrete layer; 8. Steel truss; 9. Transverse structural reinforcement; 10. Longitudinal structural reinforcement; 11. Two-way structural reinforcement mesh; 12. T-shaped closed rib; 13. Rhomboid closed rib. Detailed Implementation
[0024] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.
[0025] A novel fire-resistant profiled steel sheet-concrete composite floor slab, such as Figures 1-6 As shown: The profiled steel sheet 1 is fixed to the steel beam 2. The profiled steel sheet 1 is fixed to the steel beam 2 by cylindrical head studs 3. The cylindrical head studs 3 pass through the profiled steel sheet 1 and are welded to the steel beam 2. The cylindrical head studs 3 fix the profiled steel sheet 1 to the steel beam 2. The profiled steel sheet 1 is provided with a T-shaped closed rib 12. The T-shaped closed rib 12 includes an integrally connected upper and lower flange plates and a lateral web plate. The upper and lower flange plates include an upper flange plate and a lower flange plate connected together. The upper flange plate and the lower flange plate form a hollow space. The center of the lower flange plate is perpendicularly connected to the top of the lateral web plate. The distance between the upper flange plate and the lower flange plate is equal to the distance between the two lateral web plates. The bottom end of the lateral web plate is perpendicularly connected to the base plate of the corrugated groove, forming a T-shaped hollow space with both ends connected to the base plate of the corrugated groove. The upper and lower flange plates are located obliquely above the lower chord steel bar 5.
[0026] A corrugated groove is provided between two adjacent T-shaped closed ribs 12. A steel truss 8 is welded in each corrugated groove. The steel trusses 8 are arranged in parallel and the distance between adjacent steel trusses 8 is equal. The steel truss 8 includes parallel upper chord steel bars 4 and lower chord steel bars 5. Web steel bars 6 are welded between the upper chord steel bars 4 and the lower chord steel bars 5. The web steel bars 6 are corrugated and are bent and welded between the upper chord steel bars 4 and the lower chord steel bars 5. The bottom of the web steel bars 6 is bent horizontally below the lower chord steel bars 5. The bottom bend of the web steel bars 6 is welded in the corrugated groove of the profiled steel sheet 1. The upper chord steel bars 4 located in the same corrugated groove are connected to two lower chord steel bars 5. The upper chord steel bars 4 and the lower chord steel bars 5 are arranged in an equilateral triangle. The two sides of the upper chord steel bars 4 are connected to the lower chord steel bars 5 through their respective web steel bars 6. The web steel bars 6 and the lower chord steel bars 5 located on both sides of the upper chord steel bars 4 are symmetrically arranged.
[0027] A diamond-shaped closed rib 13 is provided below the steel truss 8 at the center of the corrugated groove. The diamond-shaped closed rib 13 is located directly below the upper chord steel bar 4. A two-way structural steel mesh 11 is welded above the steel truss 8. The two-way structural steel mesh 11 includes mutually perpendicular transverse structural steel bars 9 and longitudinal structural steel bars 10. The lap joints of the transverse structural steel bars 9 and the longitudinal structural steel bars 10 are tied together. A concrete layer 7 is filled on the profiled steel sheet 1. The concrete layer 7 completely covers the two-way structural steel mesh 11 and fills the gaps in the steel truss 8. The concrete layer 7 adopts existing technology and is made of recycled coarse aggregate obtained by crushing waste concrete and slag silicate cement or high alumina cement.
[0028] This device improves the structure of the profiled steel sheet by employing a special rectangular closed structure to increase the internal cavity area and projected area of the composite panel, thereby enhancing its fire resistance. Specifically, it increases the cavity area through diamond-shaped closed ribs 13 and T-shaped closed ribs 12 while maintaining the strength of the profiled steel sheet 1 itself. It utilizes the fact that air is a poor conductor of heat; the thermal conductivity of still air is approximately 0.024 W / m·K, far lower than the 1.7 W / m·K of concrete. Furthermore, adding relatively sealed cavities within the concrete and dividing large cavities into multiple smaller cavities reduces the possibility of convection, and the inability of air to form effective convection also suppresses temperature rise.
[0029] In use, a profiled steel sheet 1 is laid on the steel beam 2. Cylindrical head studs 3 are welded through the profiled steel sheet 1 above the steel beam 2 to fix the bottom of the profiled steel sheet 1 to the steel beam 2. A welded steel truss 8 is placed in the corrugated groove of the profiled steel sheet 1. The reinforcing bars are bent at 45° to form web reinforcement bars 6. The bottom bend of the web reinforcement bars 6 is bent upwards to serve as truss supports. The upper chord reinforcement bars 4 and lower chord reinforcement bars 5 are welded to the bends of the web reinforcement bars 6 to form an integral steel truss 8. The bottom bends of the web reinforcement bars 6 are welded to the corrugated groove of the profiled steel sheet 1. A two-way structural steel mesh 11 is welded above the steel truss 8. The two-way structural steel mesh 11 is formed by overlapping and binding the transverse structural reinforcement bars 9 and longitudinal structural reinforcement bars 10 at the overlap. Finally, a concrete layer 7 is poured using concrete made from recycled coarse aggregate obtained from crushed waste concrete and slag silicate cement or high-alumina cement.
[0030] In addition, composite floor slabs made of closed-type, narrow-type, and open-type profiled steel sheets are given as comparative examples, referred to as Model 1 to Model 3. Except for the shape of the profiled steel sheet, which is different from this embodiment (referred to as Model 4), the other conditions, including the material, thickness, model thickness, and width of the profiled steel sheet, are completely the same in the comparative examples.
[0031] like Figure 5 , 6 As shown, the temperature cloud maps of the finite element models of the four combined floor slabs after 90 minutes of fire exposure, and the comparison of the top temperatures of the different combined floor slabs, demonstrate that this invention has a good temperature barrier effect. Under the condition of 90 minutes of heating, starting from 1200s, Model 4 exhibits a different thermal conductivity and excellent thermal insulation performance compared to the other three groups. Furthermore, this thermal insulation performance becomes increasingly apparent over time, reaching approximately 100℃ at 7200s. This indicates that the combined slab represented by this model may possess good thermal insulation performance and low thermal conductivity.
[0032] It can be concluded that, under controlled variable conditions, this utility model maintains its strength while exhibiting good fire resistance and heat insulation performance, which is significantly better than other closed-type steel plates, and also has a low thermal conductivity.
[0033] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A novel fire-resistant profiled steel sheet-concrete composite floor slab, characterized in that: The steel plate (1) is fixed on the steel beam (2). The steel plate (1) is provided with T-shaped closed ribs (12). A groove is provided between two adjacent T-shaped closed ribs (12). A steel truss (8) is welded in each groove. A diamond-shaped closed rib (13) is provided below the steel truss (8) in the center of the groove. A two-way structural steel mesh (11) is welded above the steel truss (8). A concrete layer (7) is filled on the steel plate (1). The concrete layer (7) completely covers the two-way structural steel mesh (11) and fills the gaps in the steel truss (8).
2. The novel fire-resistant profiled steel sheet-concrete composite floor slab according to claim 1, characterized in that: The T-shaped closed rib (12) includes an integrally connected upper and lower flange plates and a lateral web plate. The upper and lower flange plates include an upper flange plate and a lower flange plate connected together. The upper flange plate and the lower flange plate form a hollow space. The center of the lower flange plate is perpendicularly connected to the top of the lateral web plate. The bottom of the lateral web plate is perpendicularly connected to the base plate of the corrugated groove.
3. The novel fire-resistant profiled steel sheet-concrete composite floor slab according to claim 2, characterized in that: The distance between the upper and lower flanges is equal to the distance between the two lateral webs.
4. The novel fire-resistant profiled steel sheet-concrete composite floor slab according to claim 1, characterized in that: The bidirectional structural steel mesh (11) includes mutually perpendicular transverse structural steel bars (9) and longitudinal structural steel bars (10), and the lap joints of the transverse structural steel bars (9) and longitudinal structural steel bars (10) are tied together.
5. A novel fire-resistant profiled steel sheet-concrete composite floor slab according to claim 4, characterized in that: The steel truss (8) includes parallel upper chord steel bars (4) and lower chord steel bars (5). Web steel bars (6) are welded between the upper chord steel bars (4) and the lower chord steel bars (5). The web steel bars (6) are bent and welded between the upper chord steel bars (4) and the lower chord steel bars (5). The bottom of the web steel bars (6) is bent horizontally below the lower chord steel bars (5). The bottom bend of the web steel bars (6) is welded to the groove of the profiled steel sheet (1).
6. A novel fire-resistant profiled steel sheet-concrete composite floor slab according to claim 5, characterized in that: The upper chord steel bar (4) is connected to the lower chord steel bar (5) on both sides by their respective web steel bars (6), and the web steel bars (6) and the lower chord steel bar (5) on both sides of the upper chord steel bar (4) are arranged symmetrically.
7. A novel fire-resistant profiled steel sheet-concrete composite floor slab according to claim 2, characterized in that: The upper and lower flange plates are located diagonally above the lower chord reinforcement (5).
8. A novel fire-resistant profiled steel sheet-concrete composite floor slab according to claim 1, characterized in that: The profiled steel sheet (1) is fixed to the steel beam (2) by cylindrical head studs (3).