Steel bar truss floor structure without disassembling bottom mold
By employing a combination of steel trusses and lightweight fire-resistant frame components in the floor structure, the problems of loose connections and insufficient fire resistance were solved, thereby improving the stability and fire resistance of the structure and ensuring the safety and durability of the building in a fire.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LIEN ENG DESIGN CONSULTING CO LTD
- Filing Date
- 2025-05-15
- Publication Date
- 2026-06-05
AI Technical Summary
Existing steel truss floor structures that do not require the removal of the bottom formwork are prone to loosening at the connection points, have insufficient structural stability, and poor fire resistance. They cannot maintain their load-bearing capacity in a fire, affecting the safety and durability of the building.
The design employs a combination of steel trusses, lightweight fire-resistant frame components, rectangular steel plates, embedded parts, and L-shaped connecting plates to form a stable triangular structure and a grid-like frame. Combined with high-temperature resistant materials and fire-retardant coatings, it enhances connection stability and fire protection.
It improves the stability and fire resistance of the floor structure, enabling it to maintain its load-bearing capacity during a fire, extend its fire resistance time, and ensure personnel evacuation and fire rescue.
Smart Images
Figure CN224325938U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building engineering technology, and in particular to a steel truss floor structure that does not require the removal of the bottom formwork. Background Technology
[0002] In modern construction engineering, the floor structure, as a core component of the building's horizontal load-bearing system, directly affects the building's safety, durability, and functionality. Traditional floor structures mostly use cast-in-place concrete formwork, requiring a large amount of timber or steel for formwork during construction. This not only increases construction costs and resource consumption but also makes formwork removal cumbersome, affecting construction efficiency. Furthermore, it leads to significant formwork turnover losses and excessive construction waste. With the development of construction technology, formwork-free reinforced concrete truss floor structures have gradually been applied. While they can solve some of the drawbacks of traditional formwork, they still have shortcomings in overall structural stability and fire resistance.
[0003] In existing formwork-free reinforced concrete truss floor structures, the connections between the reinforced concrete truss and other components are often not robust enough. Under heavy loads or unexpected impacts, these connections are prone to loosening or even structural instability, affecting the safety of the floor structure. Furthermore, in the event of extreme disasters such as fires, the floor structure lacks effective fire protection measures. The reinforced concrete truss and formwork rapidly lose their load-bearing capacity under high temperatures, leading to floor collapse and seriously threatening the safety of people and property. Therefore, there is an urgent need to develop a structurally stable, fire-resistant formwork-free reinforced concrete truss floor structure to meet the ever-increasing safety and performance requirements of modern construction projects.
[0004] Therefore, we propose a steel truss floor structure that eliminates the need for dismantling the bottom formwork. Utility Model Content
[0005] The main purpose of this utility model is to provide a steel truss floor structure that does not require dismantling of the bottom formwork. In order to prevent problems such as "loosening of the connection between the steel truss and other components, structural instability, and collapse of the floor due to loss of load-bearing capacity under extreme disasters such as fire", the safety, stability and fire resistance of the floor structure are improved, and the increasing safety and performance requirements of modern construction projects are met. This can effectively solve the problems in the background art.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] The steel truss floor structure without the need for dismantling the bottom formwork includes a steel truss, a formwork that does not need to be dismantled, a lightweight fire-resistant frame component, a rectangular steel plate, embedded parts, and an L-shaped connecting plate. The steel truss is composed of upper chord steel bars, lower chord steel bars, and web steel bars, which are connected by welding.
[0008] The rectangular steel plate is welded onto the lightweight fire-resistant frame assembly. The top of the rectangular steel plate is provided with a bevel that matches the bottom of the web reinforcement, and the web reinforcement is welded to the bevel of the rectangular steel plate.
[0009] The lightweight fire-resistant frame assembly consists of a frame body and a fire-resistant coating;
[0010] The embedded parts are pre-installed on the non-removable bottom formwork. The L-shaped connecting plate is used to connect the longitudinal frame beam of the lightweight fire-resistant frame assembly with the embedded parts, and the outer wall of the longitudinal frame beam is welded to one side of the outer wall of the L-shaped connecting plate.
[0011] By adopting the above technical solution, the steel truss is a stable triangular structure composed of upper chord steel bars, lower chord steel bars, and web steel bars, which becomes the main load-bearing component of the floor slab. During the construction phase, the non-removable bottom formwork acts as the formwork for concrete pouring, bearing the loads of wet concrete, construction equipment, personnel, etc., and transferring them to the steel truss. During the service phase, the non-removable bottom formwork and the steel truss share the load, transferring the floor live load and dead load to the main building structure. The upper chord steel bars and lower chord steel bars mainly bear the tensile and compressive forces, while the web steel bars effectively transfer and distribute the loads, enhancing the overall stiffness of the truss.
[0012] The lightweight fire-resistant frame component is connected to the steel truss via rectangular steel plates. The bevels on the rectangular steel plates are matched with the bottom of the web reinforcement bars. After welding, the two are firmly connected, enhancing the overall structural stability of the floor. The longitudinal frame beams are connected to the embedded parts on the non-removable bottom formwork via L-shaped connecting plates. One side of the L-shaped connecting plate is welded to the outer wall of the longitudinal frame beam, achieving a stable connection between the lightweight fire-resistant frame component and the non-removable bottom formwork, ensuring that all components work together.
[0013] When a fire occurs, the lightweight fire-resistant frame components play a crucial protective role. The main frame is made of high-temperature resistant materials, and the external fireproof coating expands or forms a dense protective layer at high temperatures, reducing the rate of heat transfer and slowing down the temperature rise of the steel truss and the bottom formwork. The rectangular steel plates, L-shaped connecting plates and other connectors also have certain high-temperature resistance properties, maintaining the stability of the connection between the components, so that the floor can still maintain a certain load-bearing capacity in the fire, buying time for personnel evacuation and fire rescue.
[0014] Furthermore, the upper chord reinforcement is located at the upper part of the steel truss, the lower chord reinforcement is located at the lower part of the steel truss, and the web reinforcement connects the upper chord reinforcement and the lower chord reinforcement to form a triangular truss structure.
[0015] By adopting the above technical solution, when the floor structure is subjected to load, the upper chord steel bars mainly bear the compressive force and transfer the load along the web steel bars, while the lower chord steel bars bear the tensile force and cooperate with the compressive deformation of the upper chord steel bars to maintain the overall balance. The web steel bars connect the upper and lower chord steel bars to form a triangular truss structure, which not only transfers and distributes the load and limits excessive deformation, but also utilizes the stability characteristics of triangles to enable the steel truss to effectively resist the deformation and displacement caused by external loads in both vertical and horizontal directions, thus ensuring the safety of the floor structure.
[0016] Furthermore, the main frame includes transverse frame beams and longitudinal frame beams, and the transverse frame beams and longitudinal frame beams are interconnected to form a grid structure.
[0017] By adopting the above technical solution, the transverse frame beams and longitudinal frame beams are interconnected to form a grid-like spatial structure. This grid-like structure can evenly distribute the load on the plane, just like a fine net. For example, when the floor is subjected to a local concentrated load, the load will be diffused and transferred to the surroundings through this grid-like structure, avoiding excessive pressure in local areas and making the load distribution on the entire floor plane more uniform. The transverse frame beams and longitudinal frame beams cooperate with each other and work together. The transverse frame beams mainly bear the load transfer in the horizontal direction. For example, when the floor is subjected to wind loads or horizontal forces caused by earthquakes, the transverse frame beams transfer these forces to the longitudinal frame beams. The longitudinal frame beams then support the transverse frame beams and further transfer the load to the building's vertical support structure, such as columns. The connection nodes between them can ensure the effective transfer of forces, making the entire frame structure an organic whole.
[0018] The grid-like frame structure effectively improves the floor's resistance to deformation. When subjected to vertical loads, it restricts the vertical deformation of the floor. Due to its multiple support points and connection nodes, it can better resist bending deformation compared to a single beam structure. For example, when the floor is subjected to large live loads such as crowds gathering, the grid structure can reduce the floor's deflection and maintain its flatness. This grid structure provides a favorable spatial layout for fire protection. In the event of a fire, the fire-retardant coating combined with the frame structure can prevent the rapid spread of flames and heat. When heat spreads through the frame structure, it is hindered by the grid, slowing down the transfer of heat to other parts of the floor, such as the steel truss and the formwork, thus ensuring the stability of the entire floor structure in a fire.
[0019] Furthermore, the transverse frame beam is located above the longitudinal frame beam, and the transverse frame beam and the longitudinal frame beam are connected by welding.
[0020] By adopting the above technical solution, the transverse frame beams are located above the longitudinal frame beams and connected by welding. The two work together to construct a stable grid load-bearing system. Under vertical loads, such as the weight of people and equipment on the floor, the transverse frame beams bear the load first and distribute it to the welded longitudinal frame beams by virtue of their own bending resistance. The longitudinal frame beams then further transfer the load to the vertical load-bearing components of the building. The welding connection ensures that the two form a solid whole, enhances structural rigidity, and reduces the relative displacement and deformation at the connection due to the load. Under horizontal loads such as wind and seismic forces, this superimposed and welded frame beam structure can support each other and share the load. The transverse frame beams provide lateral constraints to the longitudinal frame beams, and the longitudinal frame beams enhance the stability of the transverse frame beams. Together, they resist the structural swaying and deformation caused by horizontal forces, maintain the stability of the floor structure, and also lay the structural foundation for the lightweight fire-resistant frame components to play a protective role in fire.
[0021] Furthermore, the top two sides of the pre-embedded part are provided with multiple equally spaced screw holes, and the L-shaped connecting plate and the non-removable bottom mold are provided with threaded through holes for bolt connection near the screw holes. The bottom end of the bolt passes through the threaded through hole and is threadedly connected to the screw hole.
[0022] By adopting the above technical solution, the embedded parts are pre-set in the non-removable bottom formwork. The equally spaced screw holes on both sides of the top of the embedded parts provide the basic points for connection. During installation, the L-shaped connecting plate is attached to the non-removable bottom formwork, so that the threaded through holes on the L-shaped connecting plate and the non-removable bottom formwork are precisely aligned with the screw holes of the embedded parts. Then, the bottom end of the bolt is passed through the threaded through hole and screwed into the screw hole of the embedded part. As the bolt is tightened, the L-shaped connecting plate and the non-removable bottom formwork are firmly fixed. At the same time, the other side of the L-shaped connecting plate is welded to the longitudinal frame beam of the lightweight fire-resistant frame component, thereby firmly installing the lightweight fire-resistant frame component on the non-removable bottom formwork. This connection method can withstand construction loads during the construction phase and ensure that the lightweight fire-resistant frame component and the non-removable bottom formwork steel truss floor structure work together during the service phase. In the event of a fire, it ensures that the lightweight fire-resistant frame component plays a fire protection role and maintains the overall stability of the floor structure.
[0023] Furthermore, the fire-retardant coating is applied to the surface of the frame body.
[0024] By adopting the above technical solution, a fire-retardant coating is applied to the surface of the frame structure. In the event of a fire, it provides fire protection through physical and chemical processes. When the temperature rises, the low-melting-point substances in the fire-retardant coating melt first, forming a continuous liquid film on the surface of the frame structure. This film isolates oxygen from contact with the frame structure, slowing down the combustion process. When the partially intumescent fire-retardant coating is heated, the foaming agent inside decomposes to produce a large amount of non-combustible gas, causing the coating to expand dozens of times, forming a honeycomb-like heat insulation layer. This increases thermal resistance, reduces the rate at which heat is conducted to the frame structure, and slows down the decrease in strength of the frame structure caused by high temperatures. This ensures that the lightweight fire-resistant frame components maintain structural integrity during a fire, continuously providing protection for the non-removable bottom formwork and steel trusses, and extending the fire resistance time of the floor structure.
[0025] Compared with the prior art, the present invention has the following beneficial effects:
[0026] (1) The steel truss floor structure of this utility model, which does not require the removal of the bottom formwork, significantly improves the stability and load-bearing capacity of the floor structure through its unique structural design. The steel truss is a stable triangular structure formed by welding the top chord steel bars, bottom chord steel bars and web steel bars, which becomes the main load-bearing component of the floor. The top chord steel bars and bottom chord steel bars bear the tensile and compressive forces respectively, while the web steel bars effectively transfer and distribute the load, enhancing the overall rigidity of the truss. The lightweight fire-resistant frame component is connected to the steel truss through a rectangular steel plate. The bevel on the rectangular steel plate is adapted to the bottom of the web steel bars and welded to make the two firmly connected. The longitudinal frame beam is connected to the embedded parts on the bottom formwork by means of an L-shaped connecting plate, realizing a stable connection between the lightweight fire-resistant frame component and the bottom formwork. All components work together. During the construction phase, the non-removable bottom formwork acts as a concrete pouring template, bearing the wet concrete and construction loads and transferring them to the steel truss. During the service phase, the non-removable bottom formwork and the steel truss share the load, transferring the floor load to the main building structure. This effectively resists external loads in both vertical and horizontal directions, reduces structural deformation and displacement, and ensures the safety and reliability of the floor structure under various working conditions.
[0027] (2) The present invention provides a lightweight fire-resistant frame component for the floor structure with a formwork-free steel truss structure. The frame body is made of high-temperature resistant materials, and the fire-resistant coating on the outside plays a key role in the event of a fire. The low-melting-point substances in the fire-resistant coating melt when heated and form a liquid film on the surface of the frame body to isolate oxygen and slow down combustion. When the intumescent fire-resistant coating is heated, the foaming agent decomposes to produce a large amount of non-combustible gas, which causes the coating to expand and form a honeycomb-shaped heat insulation layer, increasing thermal resistance and reducing the heat conduction speed to the frame body, thus delaying the strength reduction of the frame body due to high temperature. At the same time, the rectangular steel plate, L-shaped connecting plate and other connectors have certain high-temperature resistance, maintain the connection stability of each component, ensure that the lightweight fire-resistant frame component maintains the structural integrity in the fire, continuously provides protection for the formwork-free and steel truss structure, extends the fire resistance time of the floor structure, and buys valuable time for personnel evacuation and fire rescue, greatly improving the safety of the building in fire and other disasters. Attached Figure Description
[0028] Figure 1 This is a structural schematic diagram of the steel truss floor slab structure that requires no dismantling of the bottom formwork according to this utility model.
[0029] Figure 2 This is a schematic diagram of the lightweight fire-resistant frame component of the steel truss floor structure that does not require dismantling of the bottom formwork according to this utility model.
[0030] Figure 3 This is a schematic diagram of the fireproof coating structure of the steel truss floor slab structure that does not require dismantling of the bottom formwork according to this utility model.
[0031] In the diagram: 1. Steel truss; 2. No-removal bottom formwork; 3. Lightweight fire-resistant frame assembly; 4. Rectangular steel plate; 5. Embedded parts; 6. L-shaped connecting plate; 7. Top chord reinforcement; 8. Bottom chord reinforcement; 9. Web reinforcement; 10. Bevel; 11. Transverse frame beam; 12. Longitudinal frame beam; 13. Bolt; 14. Fireproof coating. Detailed Implementation
[0032] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0033] To prevent problems such as loosening of connections between steel trusses and other components, structural instability, and floor collapse due to loss of load-bearing capacity under extreme disasters such as fires, thereby improving the safety, stability, and fire resistance of floor structures and meeting the ever-increasing safety and performance requirements of modern construction projects, such as... Figure 1 , Figure 2 , Figure 3As shown, the steel truss floor structure without dismantling the bottom formwork includes a steel truss 1, a bottom formwork without dismantling 2, a lightweight fire-resistant frame component 3, a rectangular steel plate 4, embedded parts 5, and an L-shaped connecting plate 6. The steel truss 1 is composed of upper chord steel bars 7, lower chord steel bars 8, and web steel bars 9, and the upper chord steel bars 7, lower chord steel bars 8, and web steel bars 9 are connected by welding.
[0034] The rectangular steel plate 4 is welded onto the lightweight fire-resistant frame assembly 3. The top of the rectangular steel plate 4 is provided with a bevel 10 that matches the bottom of the web reinforcement 9, and the web reinforcement 9 is welded to the bevel 10 of the rectangular steel plate 4.
[0035] The lightweight fire-resistant frame assembly 3 consists of a frame body and a fire-resistant coating 14;
[0036] The embedded part 5 is pre-set on the non-removable bottom formwork 2. The L-shaped connecting plate 6 is used to connect the longitudinal frame beam 12 of the lightweight fire-resistant frame assembly 3 with the embedded part 5, and the outer wall of the longitudinal frame beam 12 is welded to the outer wall of one side of the L-shaped connecting plate 6.
[0037] In use, the steel truss 1 is a stable triangular structure welded together from the top chord steel bars 7, the bottom chord steel bars 8, and the web steel bars 9, becoming the main load-bearing component of the floor slab. During the construction phase, the non-removable bottom formwork 2 acts as the formwork for concrete pouring, bearing the loads of wet concrete, construction equipment, personnel, etc., and transferring them to the steel truss. During the service phase, the non-removable bottom formwork and the steel truss share the load, transferring the floor live load and dead load to the main building structure. The top chord steel bars and the bottom chord steel bars mainly bear the tensile and compressive forces, while the web steel bars effectively transfer and distribute the loads, enhancing the overall stiffness of the truss.
[0038] The lightweight fire-resistant frame component 3 is connected to the steel truss via a rectangular steel plate 4. The bevel 10 on the rectangular steel plate is adapted to the bottom of the web reinforcement 9. After welding, the two are firmly connected, enhancing the overall structural stability of the floor. The longitudinal frame beam 12 is connected to the embedded part 5 on the non-removable bottom formwork 2 via an L-shaped connecting plate 6. One side of the L-shaped connecting plate is welded to the outer wall of the longitudinal frame beam, realizing a stable connection between the lightweight fire-resistant frame component and the non-removable bottom formwork, ensuring that all components work together.
[0039] When a fire occurs, the lightweight fire-resistant frame component 3 plays a key protective role. Its main frame is made of high-temperature resistant materials, and the external fireproof coating 14 expands or forms a dense protective layer at high temperatures, reducing the heat transfer rate and slowing down the temperature rise of the steel truss and the bottom formwork. The rectangular steel plate 4, L-shaped connecting plate 6 and other connectors also have certain high-temperature resistance properties, maintaining the stability of the connection between the components, so that the floor can still maintain a certain load-bearing capacity in the fire, buying time for personnel evacuation and fire rescue.
[0040] For example, such as Figure 1As shown, the present invention also includes the upper chord steel bar 7 located at the upper part of the steel truss 1, the lower chord steel bar 8 located at the lower part of the steel truss 1, and the web steel bar 9 connecting the upper chord steel bar 7 and the lower chord steel bar 8 to form a triangular truss structure.
[0041] When in use, when the floor structure is under load, the top chord reinforcement 7 mainly bears the compressive force and transfers the load along the web reinforcement 9. The bottom chord reinforcement 8 bears the tensile force and works in conjunction with the compressive deformation of the top chord reinforcement 7 to maintain overall balance. The web reinforcement 9 connects the top chord reinforcement 7 and the bottom chord reinforcement 8 to form a triangular truss structure, which not only transfers and distributes the load and limits excessive deformation, but also utilizes the stability characteristics of triangles to enable the steel truss 1 to effectively resist the deformation and displacement caused by external loads in both vertical and horizontal directions, thus ensuring the safety of the floor structure.
[0042] For example, such as Figure 1 , Figure 2 As shown, the present invention also includes a frame body comprising a transverse frame beam 11 and a longitudinal frame beam 12, wherein the transverse frame beam 11 and the longitudinal frame beam 12 are interconnected to form a grid structure.
[0043] In use, the transverse frame beams 11 and longitudinal frame beams 12 are interconnected to form a grid-like spatial structure. This grid-like structure can evenly distribute the load on the plane, just like a fine net. For example, when the floor is subjected to a local concentrated load, the load will be spread and transferred to the surroundings through this grid-like structure, avoiding excessive pressure in local areas and making the load distribution on the entire floor plane more uniform. The transverse frame beams and longitudinal frame beams work together. The transverse frame beams mainly bear the load transfer in the horizontal direction. For example, when the floor is subjected to wind loads or horizontal forces caused by earthquakes, the transverse frame beams transfer these forces to the longitudinal frame beams. The longitudinal frame beams then support the transverse frame beams and further transfer the load to the building's vertical support structure, such as columns. The connection nodes between them can ensure the effective transfer of forces, making the entire frame structure an organic whole.
[0044] The grid-like frame structure effectively improves the floor's resistance to deformation. When subjected to vertical loads, it can limit the vertical deformation of the floor. Due to its multiple support points and connection nodes, it can better resist bending deformation compared to a single beam structure. For example, when the floor is subjected to large live loads such as crowds gathering, the grid structure can reduce the floor's deflection and maintain its flatness. This grid structure provides a favorable spatial layout for fire protection. In the event of a fire, the fire-retardant coating 14, combined with the frame structure, can prevent the rapid spread of flames and heat. When heat spreads through the frame structure, it is hindered by the grid, slowing down the transfer of heat to other parts of the floor, such as the steel truss and the formwork, thus ensuring the stability of the entire floor structure in a fire.
[0045] For example, such as Figure 1 , Figure 2 As shown, the present invention also includes a transverse frame beam 11 located above the longitudinal frame beam 12, and the transverse frame beam 11 and the longitudinal frame beam 12 are connected by welding.
[0046] In use, the transverse frame beam 11 is located above the longitudinal frame beam 12 and connected by welding. Together, they form a stable grid load-bearing system. Under vertical loads, such as the weight of people and equipment on the floor, the transverse frame beam 11 first bears the load and, with its own bending resistance, distributes it to the welded longitudinal frame beam 12. The longitudinal frame beam 12 then further transfers the load to the building's vertical load-bearing components. The welded connection ensures that the two form a solid whole, enhancing structural rigidity and reducing relative displacement and deformation at the connection due to load. Under horizontal loads such as wind and seismic forces, this stacked and welded frame beam structure can support each other and share the load. The transverse frame beam 11 provides lateral restraint to the longitudinal frame beam 12, and the longitudinal frame beam 12 enhances the stability of the transverse frame beam 11. Together, they resist structural swaying and deformation caused by horizontal forces, maintaining the stability of the floor structure. At the same time, it lays the structural foundation for the lightweight fire-resistant frame components to play a protective role in fire.
[0047] For example, such as Figure 1 As shown, this utility model also includes multiple equally spaced screw holes on both sides of the top of the embedded part 5, and threaded through holes for connecting bolts 13 are provided on the L-shaped connecting plate 6 and the non-removable bottom mold 2 near the screw holes. The bottom end of the bolt 13 passes through the threaded through hole and is threadedly connected to the screw hole.
[0048] During use, the embedded part 5 is pre-set in the non-removable bottom formwork 2. The equally spaced screw holes on both sides of its top provide the basic points for connection. During installation, the L-shaped connecting plate 6 is attached to the non-removable bottom formwork 2, so that the threaded through holes on the L-shaped connecting plate 6 and the non-removable bottom formwork 2 are precisely aligned with the screw holes of the embedded part 5. Then, the bottom end of the bolt 13 is passed through the threaded through hole and screwed into the screw hole of the embedded part 5. As the bolt 13 is tightened, the L-shaped connecting plate 6 and the non-removable bottom formwork 2 are firmly fixed. At the same time, the other side of the L-shaped connecting plate 6 is welded to the longitudinal frame beam 12 of the lightweight fire-resistant frame assembly, thereby firmly installing the lightweight fire-resistant frame assembly on the non-removable bottom formwork 2. This connection method can withstand construction loads during the construction phase and ensure that the lightweight fire-resistant frame assembly and the non-removable bottom formwork steel truss floor structure work together during the use phase. In the event of a fire, it ensures that the lightweight fire-resistant frame assembly plays a fire protection role and maintains the overall stability of the floor structure.
[0049] For example, such as Figure 3 As shown, the present invention also includes the fireproof coating 14 disposed on the surface of the frame body.
[0050] In use, the fire-retardant coating 14 is applied to the surface of the frame body. In the event of a fire, it provides fire protection through physical and chemical action. When the temperature rises, the low-melting-point substances in the fire-retardant coating 14 melt first, forming a continuous liquid film on the surface of the frame body, which isolates oxygen from contact with the frame body and slows down the combustion process. When the partially intumescent fire-retardant coating 14 is heated, the foaming agent inside decomposes to produce a large amount of non-combustible gas, causing the coating to expand dozens of times, forming a honeycomb-shaped heat insulation layer, increasing thermal resistance, reducing the rate of heat conduction to the frame body, and delaying the decrease in strength of the frame body caused by high temperature. This ensures that the lightweight fire-resistant frame components maintain structural integrity in a fire, continuously providing protection for the non-removable bottom formwork and steel truss, and extending the fire resistance time of the floor structure.
[0051] It should be noted that this utility model is a steel truss floor structure that does not require dismantling of the bottom formwork. The upper chord steel bars 7, the lower chord steel bars 8, and the web steel bars 9 are welded together to form a stable triangular steel truss 1, which serves as the main load-bearing component of the floor.
[0052] The rectangular steel plate 4 is welded onto the lightweight fire-resistant frame component 3. The bevel 10 at the top of the rectangular steel plate 4 is adapted to the bottom of the web reinforcement 9, and the web reinforcement 9 is welded to the bevel 10 of the rectangular steel plate 4.
[0053] The embedded part 5 is pre-set on the non-removable bottom formwork 2. One side of the L-shaped connecting plate 6 is welded to the outer wall of the longitudinal frame beam 12 of the lightweight fire-resistant frame assembly 3. The threaded through holes on the L-shaped connecting plate 6 and the non-removable bottom formwork 2 are precisely aligned with the screw holes of the embedded part 5. The bolt 13 passes through the threaded through holes and is threadedly connected to the screw holes to achieve a stable connection between the lightweight fire-resistant frame assembly 3 and the non-removable bottom formwork 2.
[0054] The bottom formwork 2, which can be removed, serves as the formwork for concrete pouring, bearing the loads of wet concrete, construction equipment, personnel, etc., and transferring them to the steel truss 1. The bottom formwork 2 and the steel truss 1 share the load. The upper chord steel bars 7 and the lower chord steel bars 8 bear the tensile and compressive forces, and the web steel bars 9 transmit and distribute the loads.
[0055] In the event of a fire, the main frame of the lightweight fire-resistant frame component 3 is made of high-temperature resistant material. The external fireproof coating 14 expands or forms a dense protective layer at high temperatures, reducing the heat transfer rate and slowing down the temperature rise of the steel truss 1 and the non-removable bottom formwork 2. The rectangular steel plate 4, L-shaped connecting plate 6 and other connectors maintain the connection stability of each component, so that the floor slab maintains a certain load-bearing capacity.
[0056] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A steel truss floor structure that does not require dismantling of the bottom formwork, comprising a steel truss (1), a bottom formwork that does not require dismantling (2), a lightweight fire-resistant frame assembly (3), a rectangular steel plate (4), embedded parts (5), and an L-shaped connecting plate (6), characterized in that, The steel truss (1) is composed of upper chord steel bars (7), lower chord steel bars (8) and web steel bars (9), and the upper chord steel bars (7), lower chord steel bars (8) and web steel bars (9) are connected by welding; The rectangular steel plate (4) is welded to the lightweight fire-resistant frame assembly (3). The top of the rectangular steel plate (4) is provided with a bevel (10) that matches the bottom of the web reinforcement (9), and the web reinforcement (9) is welded to the bevel (10) of the rectangular steel plate (4). The lightweight fire-resistant frame assembly (3) consists of a frame body and a fire-resistant coating (14); The embedded part (5) is pre-set on the non-removable bottom formwork (2). The L-shaped connecting plate (6) is used to connect the longitudinal frame beam (12) of the lightweight fire-resistant frame assembly (3) with the embedded part (5), and the outer wall of the longitudinal frame beam (12) is welded to the outer wall of one side of the L-shaped connecting plate (6).
2. The steel truss floor structure without the need for dismantling the bottom formwork as described in claim 1, characterized in that: The upper chord reinforcement (7) is located on the upper part of the steel truss (1), the lower chord reinforcement (8) is located on the lower part of the steel truss (1), and the web reinforcement (9) connects the upper chord reinforcement (7) and the lower chord reinforcement (8) to form a triangular truss structure.
3. The steel truss floor structure without the need for dismantling the bottom formwork as described in claim 1, characterized in that: The main frame includes transverse frame beams (11) and longitudinal frame beams (12), and the transverse frame beams (11) and longitudinal frame beams (12) are connected to each other to form a grid structure.
4. The steel truss floor structure with no need for bottom formwork removal as described in claim 3, characterized in that: The transverse frame beam (11) is located above the longitudinal frame beam (12), and the transverse frame beam (11) and the longitudinal frame beam (12) are connected by welding.
5. The steel truss floor structure without the need for dismantling the bottom formwork as described in claim 1, characterized in that: The top two sides of the pre-embedded part (5) are provided with multiple equally spaced screw holes. The L-shaped connecting plate (6) and the non-removable bottom mold (2) are both provided with threaded through holes for connecting with bolts (13) near the screw holes. The bottom end of the bolt (13) passes through the threaded through hole and is threadedly connected to the screw hole.
6. The steel truss floor structure with no need for bottom formwork removal according to claim 1, characterized in that: The fireproof coating (14) is applied to the surface of the frame body.