Floor slab connecting joint capable of enhancing anti-seismic performance and construction method

Abstract

The invention discloses a floor slab connecting joint capable of enhancing anti-seismic performance and a construction method, and relates to the technical field of fabricated steel structure buildings. Comprising an overall frame, a filling layer, a pouring layer, distributed steel bars, screw components and embedded pipelines. The overall frame is of a space truss structure formed by welding transverse and longitudinal high-strength steel keels, double fixation is formed through reserved connectors and screw components, and bidirectional constraint with steel beams is achieved. The filling layer is made of a light thermal insulation material and has the functions of weight reduction and thermal insulation, and a corrosion-resistant functional pipeline is pre-embedded in the filling layer; the pouring layer is made of high-strength lightweight concrete and is cooperatively stressed with the integral frame and the steel beams; the distributed steel bars and the integral frame are fixed and laid in the pouring layer, and the anti-cracking performance is improved. The problems that an existing floor and steel beam connection is poor in integrity, insufficient in seismic resistance, tedious in construction, single in function, poor in thermal bridge effect and the like are solved, connection, seismic resistance, heat preservation and pipeline pre-burying integration is achieved, and the method is suitable for multi-story and high-rise civil buildings, public buildings and industrial factory buildings.

Description

Technical Field

[0001] This invention relates to the field of prefabricated steel structure building technology, specifically to a connection node between floor slabs that can enhance seismic performance and its construction method. Background Technology

[0002] The prefabricated steel structure building industry is developing rapidly, and the connection between floor slabs and steel beams in the floor system is one of the key factors affecting the efficient construction of buildings. As the main load-bearing component in the horizontal direction, the floor slab and the steel beam are the main load-bearing components perpendicular to the ground. The two need to work together through connection nodes, and the connection effect directly affects the building's safety, seismic resistance, and construction speed.

[0003] Currently, commonly used floor slabs such as cast-in-place reinforced concrete slabs, steel truss floor slabs, precast concrete composite floor slabs, profiled steel sheet-concrete composite floor slabs, and lightweight sheet floor slabs generally suffer from three major problems when connected to steel beams: First, the overall integrity of the connection nodes is poor, often consisting of simple overlaps or single-point fixations, resulting in insufficient horizontal restraint and susceptibility to relative displacement under seismic loads, failing to effectively transfer horizontal loads. Second, the connection process is complex, relying on on-site welding, pouring, and other wet operations, or requiring stringent hoisting precision, leading to low assembly efficiency and difficulty in quality control. Third, the function is singular, focusing only on load-bearing connections without considering comprehensive needs such as insulation and pipeline pre-embedding, resulting in high maintenance costs later on. Furthermore, existing connection methods often create thermal bridges due to direct contact between metal components, leading to poor insulation performance and requiring additional insulation measures, increasing construction costs and procedures.

[0004] There is currently no technology or product that simultaneously meets the requirements of "effective and reliable connection between floor slabs and steel beams, good resistance to lateral displacement, and convenient and quick construction". Therefore, developing a floor slab connection node and construction method that combines high integrity, strong seismic resistance, high assembly efficiency and multi-functional integration has become an urgent need to promote the high-quality development of prefabricated steel structure buildings. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a floor slab connection node and construction method that can enhance seismic performance, achieving integrated connection between floor slabs and steel beams. This solves problems such as poor overall integrity, insufficient seismic resistance, cumbersome construction, limited functionality, and thermal bridging effect of existing connection nodes, thereby improving the safety, assembly efficiency, and overall performance of buildings.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A floor slab connection node that can enhance seismic performance includes several integral composite floor slabs connected by steel beams. Each integral composite floor slab includes an integral frame, a filling layer, a cast-in-place layer, distributed reinforcement bars, bolt members, and embedded pipelines. The overall frame is a space frame structure made of horizontal and vertical high-strength steel keels welded together. The keels are fixed by full welding after rust removal treatment. Both sides of the bottom of the overall frame are provided with reserved interfaces that are compatible with the flanges of the steel beams. Through holes for through bolts are provided at the interfaces, and through bolt holes are opened at the corresponding positions of the steel beams. The filling layer is a lightweight insulation material injected into the cavity inside the overall frame. The lightweight insulation material is seamlessly attached to the inner wall of the steel keel, and a pre-embedded channel for pipelines is reserved inside. The pouring layer is high-strength lightweight concrete poured at the top and bottom of the overall frame, and is tightly bonded to the edges of the reserved interfaces of the overall frame and steel beams; The distributed reinforcement includes longitudinal distributed reinforcement at the top and bottom and transverse distributed reinforcement at the top and bottom. The distributed reinforcement is fixedly connected to the overall frame and laid in the cast-in-place layer. The screw component is a high-strength bolt with a length adapted to the total thickness of the floor slab frame and steel beam. The screw component penetrates vertically through the connection between the floor slab and steel beam via a pre-reserved through hole. The screw head is an irregularly shaped structure that precisely engages with the inner wall of the overall frame and the side groove of the steel beam, forming a two-way fixing effect of vertical compression and horizontal constraint. The embedded pipelines are functional pipelines made of corrosion-resistant materials, embedded in a dedicated channel of lightweight insulation material and firmly fixed, without interfering with the overall frame, screw components and steel beams.

[0007] Furthermore, the high-strength steel is C-shaped steel, with a cross-sectional height of 120-160mm, a flange width of 50-70mm, and a thickness of 2-3mm.

[0008] Furthermore, the lightweight thermal insulation material is foamed concrete, in which 5%-8% polypropylene fiber is incorporated.

[0009] Furthermore, the high-strength lightweight concrete is lightweight aggregate concrete, with the top lightweight aggregate concrete having a thickness of 70-90mm and the bottom lightweight aggregate concrete having a thickness of 40-60mm.

[0010] Furthermore, the diameter of the longitudinally distributed reinforcing bars is 8-12 mm, the diameter of the transversely distributed reinforcing bars is 14-18 mm, and the spacing of the transversely distributed reinforcing bars is 4500-4900 mm.

[0011] Furthermore, 4-6 threaded rods are evenly arranged at the connection between each integral composite floor slab and the steel beam. The diameter of the threaded rods is 12-14mm, the strength grade is 6.8-10.9, and anti-loosening nuts are used.

[0012] Furthermore, the through bolt holes on the steel beam are elliptical holes with a major axis of 14-16mm and a minor axis of 18-22mm. An elastic sealing gasket is added to the reserved interface between the overall frame and the steel beam. The embedded pipelines are water, electricity and heating pipelines made of PVC, PE or PPR.

[0013] Furthermore, the overall frame is integrated with the keel joints of the adjacent floor slabs, and the joints of the adjacent floor slabs are locked simultaneously when the screw components are tightened; the overall frame, the top and bottom longitudinally distributed steel bars and the top and bottom transversely distributed steel bars, the screw components and the embedded pipelines are prefabricated into standardized modules and are precisely assembled at the factory.

[0014] To achieve the above objectives, the present invention also provides a construction method based on the above-mentioned connection nodes, including a factory prefabrication stage and an on-site installation stage, the specific steps of which are as follows: (1) Factory prefabrication stage: a. Process the steel keel according to the design dimensions, remove rust from the keel, and process the reserved interface and screw through hole at the bottom of the overall frame according to the cross-sectional dimensions of the steel beam; b. Use full welding process to weld the longitudinal and transverse keels to form an integral frame, and check the reserved interface size and screw hole position accuracy; c. Lay the top and bottom longitudinal distribution steel bars and the top and bottom transverse distribution steel bars, and fix them to the overall frame; d. Pour lightweight insulation material into the frame, and simultaneously embed the pre-buried pipelines in the reserved channels and fix them firmly; e. Pour high-strength lightweight concrete at the top and bottom, and cure it according to the standard until the concrete strength reaches the standard, thus completing the prefabrication of a single monolithic composite floor slab; (2) On-site installation stage: a. Clean and level the construction site, erect the construction scaffold, hoist the steel beams into place and fix them firmly, and correct the horizontality, verticality and spacing of the steel beams; b. Hoist the prefabricated integral composite floor slab above the steel beam, so that the reserved interface at the bottom of the integral frame is connected with the flange of the steel beam, and ensure that the bolt holes are aligned; c. Insert the threaded rod components, insert the head of the threaded rod into the slot of the overall frame and the steel beam, and tighten the nut to achieve bidirectional fixation of the floor slab and the steel beam; d. Inspect the connection gap between the integral composite floor slab and the steel beam, and fill the joint with sealant if necessary; e. Connect and debug the pre-buried pipelines, clean up the construction site, and complete the overall installation.

[0015] Furthermore, in step d of the factory prefabrication stage, the overall frame is sealed before pouring in lightweight insulation material; in step e of the factory prefabrication stage, the accuracy of the reserved interfaces and screw holes of the integral composite floor slab is checked before leaving the factory; in step c of the on-site installation stage, the nuts are tightened to the specified torque using a torque wrench or electric wrench.

[0016] Beneficial effects: (1) Excellent connection integrity and seismic performance: Through the dual design of reserved interface + screw bidirectional constraint, the floor slab and steel beam are closely attached and synchronously subjected to force, effectively transferring vertical and horizontal loads and avoiding relative displacement; the horizontal constraint function of the screw component and the frame-steel beam cooperative force system greatly improve the node's resistance to lateral displacement and shear resistance, which can effectively resist strong earthquakes and meet the needs of multi-story buildings and earthquake-prone areas.

[0017] (2) High construction efficiency and low cost: The factory prefabrication and on-site installation mode is adopted. The overall frame, distributed steel bars, bolt components and embedded pipelines are prefabricated into standardized modules and are precisely assembled at the factory. No welding, pouring and other wet operations are required on site. Installation can be completed by hoisting and tightening bolts, which reduces the requirements for hoisting accuracy and the reliance on workers' professional skills. A single person can complete the installation of a single floor slab, shortening the construction period and reducing labor costs. At the same time, the embedded parts are eliminated, simplifying the beam construction process and avoiding rework caused by positioning deviation. Moreover, the "connecting beam + splicing" is completed in one operation, which further improves the construction efficiency.

[0018] (3) Integrated functions: It integrates connection, earthquake resistance, heat preservation and pipeline pre-embedding functions. The lightweight heat preservation material filling layer blocks the thermal bridge effect, meets the building energy conservation requirements, and does not require additional heat preservation layer; water, electricity and heating pipelines are pre-embedded in the filling layer to avoid damage to nodes during later construction, optimize building space and increase indoor net height; the connection node is reversible, which makes it convenient for later local modification and has low maintenance cost.

[0019] (4) Reliable product quality and wide range of applications: All components are processed and manufactured in the factory with accurate specifications and controllable quality. The uniform precision of standardized modules can avoid on-site operation errors, making the panel splicing gaps more uniform and improving the flatness and aesthetics of the building surface. Lightweight filling materials reduce the self-weight of the floor slab and the load on the steel beams, which can optimize the cross-sectional dimensions of the steel beams and save steel consumption. It is suitable for various types of prefabricated steel structure buildings such as multi-story and high-rise civil buildings, public buildings and industrial plants, and is especially suitable for projects with high requirements for connection reliability and seismic performance. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1This is a schematic diagram of an integral composite floor slab with enhanced seismic performance for connecting nodes between floor slabs, as described in an embodiment of the present invention. Figure 2 This is a schematic diagram of an integral composite floor slab structure with enhanced seismic performance for the inter-slab connection nodes as described in an embodiment of the present invention. Figure 3 This is a schematic diagram of an integral composite floor frame with enhanced seismic performance between floor slabs, as described in an embodiment of the present invention. Figure 4 This is a three-dimensional structural diagram of an integral composite floor slab with enhanced seismic performance for the inter-slab connection nodes as described in an embodiment of the present invention. Figure 5 This is a schematic diagram of the integral composite floor slab reinforcement distribution of the inter-slab connection node that can enhance seismic performance, as described in an embodiment of the present invention. Figure 6 This is a schematic diagram of the front connection between the integral composite floor slab and the steel beam, which enhances the seismic performance of the floor slab connection node according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the integral composite floor slab and steel beam side connection of the floor slab connection node that can enhance seismic performance, as described in an embodiment of the present invention. Figure 8 This is a plan view of the top surface of the integral composite floor slab and steel beam of the floor slab connection node that can enhance seismic performance, as described in the embodiment of the present invention. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example 1 See Figure 1-8 A floor slab connection node that can enhance seismic performance includes several integral composite floor slabs 1 connected by steel beams 7. Each integral composite floor slab 1 includes an integral frame 5, a filling layer, a pouring layer, distributed reinforcement, bolt members 8, and embedded pipelines 3. The overall frame 5 is a space frame structure formed by welding horizontal and vertical high-strength steel keels together. After the keels are derusted, they are fixed by full welding. Both sides of the bottom of the overall frame 5 are provided with reserved interfaces that are adapted to the flanges of the steel beams 7. Through holes for through bolts are provided at the interfaces. Through bolt through holes are opened at the corresponding positions of the steel beams 7. The filling layer is a lightweight insulation material injected into the internal cavity of the overall frame 5. The lightweight insulation material is seamlessly attached to the inner wall of the steel keel, and a pre-embedded channel for pipelines is reserved inside. The pouring layer is high-strength lightweight concrete poured on the top and bottom of the overall frame 5 respectively, and is tightly bonded to the reserved interface edges of the overall frame 5 and steel beam 7; The distributed reinforcement includes top and bottom longitudinal distributed reinforcement 4 and top and bottom transverse distributed reinforcement 4'. The distributed reinforcement is fixedly connected to the overall frame 5 and laid in the cast layer. The screw component 8 is a high-strength bolt with a length adapted to the total thickness of the floor slab frame and the steel beam. The screw component 8 penetrates vertically through the connection between the floor slab and the steel beam via a pre-reserved through hole. The screw head is an irregularly shaped structure that precisely engages with the inner wall of the overall frame 5 and the side groove of the steel beam 7, forming a two-way fixing effect of vertical compression and horizontal constraint. The pre-embedded pipeline 3 is a functional pipeline made of corrosion-resistant material. It is pre-embedded in a special channel of lightweight insulation material and fixed firmly, without interfering with the overall frame 5, screw components 8 and steel beams 7.

[0024] It should be noted that, in order for the floor slab and steel beams to share the load and form a unified structure, appropriate high-strength bolts are selected based on actual engineering requirements to pass through these pre-drilled holes in the floor slab. Because this connection method between the floor slab and steel beams utilizes a unique design concept of pre-drilled holes in the floor slab, it not only significantly improves the overall rigidity of the entire building but also effectively resists seismic forces in various horizontal directions, giving it excellent earthquake resistance and reducing the impact of deformation caused by changes in the external environment to a certain extent.

[0025] The core innovation of this embodiment lies in the integrated connection design of the floor slab and steel beam: the overall frame formed by welding C-shaped steel keel serves as the load-bearing core of the floor slab. The connection between the frame and the steel beam adopts a double-fixing structure with a pre-reserved adapter interface and high-strength bolts for bidirectional constraint, ensuring that the floor slab and steel beam are tightly fitted and synchronously stressed, significantly improving the integrity and seismic performance of the connection node. The connection node between the bolts and the slab keel is prefabricated into standardized modules, and the keel and bolts are precisely assembled at the factory. On-site construction requires no additional measurement or drilling; simply align the module with the pre-reserved hole in the beam and tighten the fastening nut to complete the connection of a single slab. This method is particularly helpful for construction, as installation can be completed by a single person, thereby shortening the construction time of a single floor slab. At the same time, it reduces the reliance on workers' professional skills and reduces labor costs. For the building, the uniform precision of the standardized modules can avoid on-site operation errors, making the gaps between the slabs more uniform and significantly improving the flatness and aesthetics of the building surface.

[0026] Traditional floor slab-beam connections often require pre-embedded components during beam casting. This design eliminates the need for pre-embedded components, directly using bolts to secure the beam through pre-drilled holes in the joists. During construction, rework due to positioning errors of pre-embedded components is eliminated, simplifying beam construction and allowing for greater flexibility in on-site operations. Furthermore, this connection is reversible, facilitating future modifications to beams or floor slabs. This design also integrates the joist joints of adjacent floor slabs with the bolt clamping points—tightening the bolts simultaneously connects a single floor slab to the beam and locks the joints of adjacent slabs. During construction, both beam connection and joint installation are completed in a single operation, eliminating the need for separate joint treatment, thus improving efficiency and ensuring joint precision. To reduce the weight of the floor slab, foamed concrete is poured inside the frame. Foamed concrete is lightweight, has thermal insulation properties, and effectively improves the floor slab's insulation performance. Simultaneously, lightweight aggregate concrete is poured at the top and bottom of the frame. All water, electricity, and heating pipes are pre-embedded within the foamed concrete. This type of floor slab can be prefabricated in the factory, eliminating the need for on-site formwork and resulting in extremely high assembly efficiency. The weight is supported by a C-shaped steel frame, and the top and bottom of the floor slab are reinforced with steel bars, ensuring reliable load-bearing capacity. The concrete layer at the bottom of the floor slab can be directly inserted into the building's steel frame, reducing the precision requirements for hoisting. Pre-embedding pipes in the foamed concrete layer optimizes building space, increases interior height, and speeds up installation, eliminating the need for on-site grooving, drilling, and secondary hoisting. This design completely solves the problems of poor overall integrity, insufficient seismic resistance, and cumbersome construction associated with existing floor slab-steel beam connections, achieving an integrated function of "connection-seismic resistance-insulation-pipeline pre-embedding."

[0027] In a specific example, the high-strength steel is C-shaped steel with a cross-sectional height of 120-160mm, a flange width of 50-70mm, and a thickness of 2-3mm. The lightweight insulation material is foamed concrete 6, incorporating 5%-8% polypropylene fiber to improve its crack resistance and toughness, preventing cracking of the infill layer from affecting the stress transfer between the floor slab and the steel beam. The high-strength lightweight concrete is lightweight aggregate concrete, with the top lightweight aggregate concrete 2 having a pouring thickness of 70-90mm and the bottom lightweight aggregate concrete 2' having a pouring thickness of 40-60mm. The longitudinally distributed reinforcing bars have a diameter of 8-12mm, the transversely distributed reinforcing bars have a diameter of 14-18mm, and the transversely distributed reinforcing bars are spaced 4500-4900mm apart. At the connection between each integral composite floor slab 1 and the steel beam, 4-6 threaded members 8 are evenly arranged, with the threaded members 8 having a diameter of 12-1mm. The bolts are 4mm thick and have a strength grade of 6.8-10.9. They are equipped with anti-loosening nuts to prevent bolts from loosening due to vibration during long-term use, ensuring the long-term reliability of the connection between the floor slab and the steel beam. The through bolt holes on the steel beam 7 are elliptical holes with a major axis of 14-16mm and a minor axis of 18-22mm. Elastic sealing gaskets are added at the reserved interfaces between the overall frame 5 and the steel beam 7 to further enhance the connection sealing and buffer seismic vibrations, reducing stress concentration at the nodes. The embedded pipelines 3 are water, electricity, and heating pipelines made of PVC, PE, or PPR. The keel joints of the overall frame 5 and the adjacent floor slabs are integrated. When the screw component 8 is tightened, the joints of the adjacent floor slabs are locked simultaneously. The overall frame 5, the top and bottom longitudinally distributed steel bars 4 and the top and bottom transversely distributed steel bars 4', the screw component 8, and the embedded pipelines 3 are prefabricated into standardized modules and precisely assembled at the factory.

[0028] In this specific implementation, one steel beam in this embodiment can connect four integral composite floor slabs. The C-shaped steel used is all high-strength steel (selected with a cross-section height of 140mm, flange width of 60mm, and thickness of 2mm). The transverse and longitudinal C-shaped keels in the overall frame need to be rust-removed and fixed to the main steel structure by full welding. While ensuring the overall rigidity and load-bearing strength of the entire frame, it effectively transfers the vertical load and horizontal seismic force to the steel beam. The bottom of the overall frame is specially designed with a reserved interface that is compatible with the steel beam. The shape and size of the interface are precisely matched with the flange of the steel beam, ensuring that the floor slab fits tightly with the steel beam after hoisting without gaps, laying the foundation for the two to work together to bear the load. In addition, there is a through hole for a through bolt at this interface position, and a corresponding through bolt hole is also opened at the position of this steel beam. The relative positional relationship between the two is very precise, so that bolts can be used to pass through the floor slab frame and the steel beam and fix them together.

[0029] The filling layer is made of foamed concrete, poured into the internal cavity of the overall frame, and seamlessly integrated with the inner wall of the C-shaped steel keel. The foamed concrete uses a lightweight and high-strength formula to reduce the self-weight of the floor slab, thereby reducing the load on the building structure and foundation. The foamed concrete also has excellent thermal insulation properties, which can block heat conduction between the overall frame and the steel beams, avoid the formation of thermal bridges at the connection nodes, and achieve built-in insulation at the connection points, eliminating the need for additional insulation layers. The foamed concrete has pre-reserved channels for laying water, electricity, and heating pipes, avoiding the need for on-site grooving and drilling that could damage the connection structure between the overall frame and the steel beams, and ensuring the integrity of the connection nodes.

[0030] The pouring layers are made of lightweight aggregate concrete, poured at the top and bottom of the overall frame, with the pouring thickness adapted to the load-bearing requirements of the steel beams (80mm at the top and 50mm at the bottom). The lightweight aggregate concrete uses high-strength lightweight aggregate, C-shaped steel joists, and distributed reinforcing bars to work together to form a robust overall floor slab structure. The pouring layers are tightly integrated with the edges of the reserved interfaces of the overall frame and steel beams, further enhancing the sealing and integrity of the connection between the floor slab and the steel beams, and preventing relative displacement under load.

[0031] Both the top and bottom longitudinal reinforcing bars are 10 x 500 mm and are clamped and fixed to the C-shaped steel keel of the overall frame. The top and bottom transverse reinforcing bars (16 mm in diameter and 4700 mm apart) are inserted into the longitudinal reinforcing bars and laid in the top and bottom lightweight aggregate concrete respectively. This can effectively disperse the stress on the floor slab, inhibit the generation and expansion of concrete cracks, and improve the crack resistance of the floor slab.

[0032] The bolted components are the core components for achieving a firm connection between the floor slab and the steel beam. They utilize 8.8 grade high-strength bolts with a diameter of 12-14mm and a length adapted to the total thickness of the floor slab frame and the steel beam. The bolted components penetrate vertically through the connection points between the floor slab and the steel beam via pre-drilled holes in the overall frame and corresponding pre-drilled holes in the steel beam (15mm x 20mm elliptical holes). Five bolts are evenly distributed at each connection point between the floor slab and the steel beam to ensure balanced force distribution. The bolted components provide bidirectional restraint: vertically, the bolts tighten and press the entire floor slab firmly against the steel beam flange, ensuring vertical load-bearing stability and effectively transferring vertical loads; horizontally, the irregularly shaped structure at the bolt head precisely engages with the grooves on the inner wall of the overall frame and the side of the steel beam, forming a strong horizontal restraint that completely suppresses the relative displacement of the floor slab and the steel beam under seismic action, achieving coordinated seismic resistance. The water, electricity, and heating pipelines are pre-embedded in dedicated channels inside the foamed concrete, without interfering with the overall frame, bolt components, and steel beams. The pipelines are made of corrosion-resistant materials (PVC, PE, etc.), and are firmly fixed during pre-embedding to prevent loosening and displacement later. During on-site installation, they are directly connected to the indoor pipeline system without additional construction, ensuring that the connection nodes between the floor slab and the steel beams are not damaged.

[0033] Example 2 To achieve the above objectives, this embodiment also provides a construction method based on the aforementioned connection nodes, including a factory prefabrication stage and an on-site installation stage, with the specific steps as follows: (1) Factory prefabrication stage: a. Process the steel keel according to the design dimensions, remove rust from the keel, and process the reserved interface and screw through hole at the bottom of the overall frame 5 according to the cross-sectional dimensions of the steel beam 7; b. Use full welding process to weld the longitudinal and transverse keels to form an integral frame 5, and check the reserved interface size and screw hole position accuracy; c. Lay the top and bottom longitudinal distribution steel bars 4 and the top and bottom transverse distribution steel bars 4', and fix them to the overall frame 5; It should be noted that the distributed reinforcing bars need to be straightened before connection to ensure that the spacing between the reinforcing bars is uniform.

[0034] d. Pour lightweight insulation material into the frame, and simultaneously embed the pre-embedded pipeline 3 in the reserved channel and fix it firmly; e. Pour high-strength lightweight concrete at the top and bottom, and cure it according to the standard until the concrete strength reaches the standard, thus completing the prefabrication of the single monolithic composite floor slab 1; (2) On-site installation stage: a. Clean and level the construction site, erect the construction scaffold, hoist the steel beam 7 into place and fix it firmly, and correct the horizontality, verticality and spacing of the steel beam; b. Hoist the prefabricated integral composite floor slab 1 above the steel beam 7, so that the reserved interface at the bottom of the integral frame 5 is connected with the flange of the steel beam 7, and ensure that the bolt holes are aligned; c. Insert the threaded rod component 8, insert the head of the threaded rod into the slot of the integral frame 5 and the steel beam 7, and tighten the nut to achieve bidirectional fixation of the floor slab and the steel beam; d. Inspect the connection gap between the integral composite floor slab 1 and the steel beam 7, and fill the joint with sealant if necessary; e. Connect and debug the pre-buried pipeline 3, clean the construction site, and complete the overall installation.

[0035] This embodiment can effectively make up for the shortcomings of the prior art, and has the comprehensive function of "load-bearing and maintenance integrated thermal insulation"; it has a high on-site assembly rate, which improves the assembly speed and production efficiency compared with cast-in-place concrete floor slabs; it has a wide range of applications and can be used in high-rise civil buildings and public building projects, and is particularly suitable for the requirements of prefabricated buildings constructed in an industrialized manner.

[0036] This embodiment involves prefabrication in a factory and assembly on the construction site. Its main features are as follows: (i) Factory prefabrication ensures accurate specifications; (ii) On-site work only requires splicing and connecting bolts, significantly reducing on-site "wet work" and thus saving considerable time; (iii) Because the components are prefabricated in the factory and transported to the construction site for assembly, product quality is guaranteed and project costs can be effectively controlled; (iv) It overcomes the problem that traditional wooden formwork cannot meet the requirements of complex structural designs; (v) It conserves timber resources; (vi) It reduces environmental pollution; and (vii) It improves the product quality and functionality of building projects.

[0037] In a specific example, in step d of the factory prefabrication stage, the overall frame 5 is sealed before pouring lightweight insulation material to prevent grout leakage; in step e of the factory prefabrication stage, the accuracy of the reserved interfaces and screw holes of the integral composite floor slab 1 is checked before leaving the factory; in step c of the on-site installation stage, the nuts are tightened to the specified torque using a torque wrench or electric wrench.

[0038] In summary, the present invention has a clear structure and solves the technical problems of poor overall connection of existing floor slabs, single function, lack of constraint system, and imbalance between thermal insulation and load-bearing capacity through the coordinated design of the overall frame, filling layer, pouring layer, distributed steel bars and connecting components.

[0039] This invention solves the problem of poor overall integrity in the connection between existing floor slabs and steel beams: through a dual design of reserved interface + two-way constraint of screw rod, the floor slab and steel beam are tightly fitted and synchronously subjected to force, effectively transferring vertical and horizontal loads and avoiding relative displacement; This invention addresses the problem of weak seismic performance of existing connection nodes: the horizontal constraint function of the screw member completely suppresses relative displacement under seismic action, and the collaborative force system of the frame and steel beam significantly improves the node's resistance to lateral displacement and shear, making it suitable for building requirements in earthquake-prone areas; This invention solves the problems of cumbersome and inefficient connection construction in existing projects: the factory prefabricates and reserves interfaces and bolt holes, and only hoisting and bolt tightening are required on site to complete the fixation. There is no need for wet operations such as welding and pouring, which reduces the hoisting accuracy requirements and improves assembly efficiency. This invention solves the obvious thermal bridging phenomenon at connection nodes in the prior art: by using foamed concrete as a filling material to isolate the heat transfer between the frame and the steel structure beam, internal insulation of the connection part is achieved; no additional insulation facilities are required. This invention solves the problems of existing connection functions being limited and high maintenance costs: it integrates connection, earthquake resistance, heat preservation, and pipeline pre-embedding functions, avoiding damage to nodes during later construction, and the anti-corrosion design of the screw extends the service life of the connection and reduces maintenance costs.

[0040] This invention features extremely high connection reliability. The floor slab and steel beam are precisely connected through reserved interfaces and bidirectional constraint by high-strength bolts, resulting in a connection integrity far exceeding that of traditional methods. It can effectively transfer vertical loads and horizontal seismic loads, significantly improving the tensile and shear resistance of the nodes and ensuring the safety of the building structure. Through the horizontal constraint of the bolts and the coordinated force sharing of the frame and steel beams, the nodes can effectively resist strong earthquakes by resisting lateral displacement, making it suitable for multi-story and high-rise buildings and earthquake-prone areas. The beneficial effects of the present invention are as follows: The device has a novel and reasonable structure, which can effectively improve the construction efficiency while improving the level of assembly. Specifically, it is manifested in the following ways: (1) The overall component design is simple and efficient; the modular planar layout and three-dimensional combination form make each unit space highly flexible and adaptable. (2) The factory prefabrication and on-site installation mode avoids the cumbersome procedures such as formwork support in the on-site pouring process, reduces the amount of wet work, and can flexibly adjust the size and connection method according to the needs, which greatly improves the production efficiency of the prefabricated building industry; (3) All components are processed and manufactured in the factory. After being transported to the construction site, the floor panels hoisted to the position can be fixed to the corresponding frame columns with bolts to complete the installation work, which greatly reduces the intensity of on-site construction work and saves construction time. This invention boasts superior overall performance: the connection nodes simultaneously provide insulation, sealing, and pipeline pre-embedding functions, blocking thermal bridging effects, meeting building energy conservation requirements, and avoiding damage to the nodes during later construction, achieving an integrated "connection-seismic resistance-insulation-function" system; the lightweight infill material reduces the floor slab's self-weight, lightens the load on steel beams, optimizes steel beam cross-sectional dimensions, and saves steel consumption; less on-site wet work is required, reducing labor and equipment costs; and subsequent maintenance is simple, significantly reducing the total life-cycle cost. Furthermore, this invention allows for the hanging of two angle irons onto embedded parts without the need for additional tools during installation. The entire hook is secured by adjusting the bolt positions, making operation convenient, quick, and safe, thus meeting diverse engineering needs. Therefore, this novel device can be widely applied not only in the construction of steel structure enclosure wall systems for various types of buildings, including multi-story and high-rise residential and public buildings, but also in the construction of steel structure wall systems for various prefabricated industrial plants. It is particularly suitable for projects with higher requirements for the reliability of joint connections and earthquake resistance.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A floor slab connection node that enhances seismic performance, characterized in that, It includes several integral composite floor slabs (1) connected by steel beams (7). Each integral composite floor slab (1) includes an integral frame (5), a filling layer, a pouring layer, distributed reinforcement, bolt members (8), and embedded pipelines (3). The overall frame (5) is a space frame structure formed by welding horizontal and vertical high-strength steel keels together. After the keels are derusted, they are fixed by full welding. Both sides of the bottom of the overall frame (5) are provided with reserved interfaces that are compatible with the flanges of the steel beams (7). Through holes for through bolts are provided at the interfaces. Through bolt holes are opened at the corresponding positions of the steel beams (7). The filling layer is a lightweight thermal insulation material injected into the cavity inside the overall frame (5). The lightweight thermal insulation material is seamlessly attached to the inner wall of the steel keel, and a pre-embedded channel for pipelines is reserved inside. The pouring layer is high-strength lightweight concrete poured on the top and bottom of the overall frame (5) respectively, and is tightly bonded to the reserved interface edges of the overall frame (5) and steel beam (7); The distributed reinforcement includes top and bottom longitudinal distributed reinforcement (4) and top and bottom transverse distributed reinforcement (4'). The distributed reinforcement is fixedly connected to the overall frame (5) and laid in the cast-in-place layer. The screw component (8) is a high-strength bolt with a length that matches the total thickness of the floor frame and the steel beam. The screw component (8) penetrates vertically through the reserved through hole at the connection between the floor and the steel beam. The screw head is a special-shaped structure that precisely engages with the inner wall of the overall frame (5) and the side groove of the steel beam (7), forming a two-way fixing effect of vertical pressing and horizontal constraint. The pre-embedded pipeline (3) is a functional pipeline made of corrosion-resistant material. It is pre-embedded in a special channel of lightweight insulation material and fixed firmly. It does not interfere with the overall frame (5), screw components (8) and steel beams (7).

2. The inter-slab connection node with enhanced seismic performance according to claim 1, characterized in that, The high-strength steel is a C-shaped steel with a cross-sectional height of 120-160mm, a flange width of 50-70mm, and a thickness of 2-3mm.

3. The inter-slab connection node with enhanced seismic performance according to claim 1, characterized in that, The lightweight thermal insulation material is foamed concrete (6), in which 5%-8% polypropylene fiber is incorporated.

4. The inter-slab connection node with enhanced seismic performance according to claim 1, characterized in that, The high-strength lightweight concrete is lightweight aggregate concrete, with the top lightweight aggregate concrete (2) having a pouring thickness of 70-90mm and the bottom lightweight aggregate concrete (2') having a pouring thickness of 40-60mm.

5. The inter-slab connection node with enhanced seismic performance according to claim 1, characterized in that, The diameter of the longitudinally distributed reinforcing bars is 8-12mm, the diameter of the transversely distributed reinforcing bars is 14-18mm, and the spacing of the transversely distributed reinforcing bars is 4500-4900mm.

6. The inter-slab connection node with enhanced seismic performance according to claim 1, characterized in that, Each integral composite floor slab (1) is evenly arranged with 4-6 screw components (8) at the connection between the steel beam and the steel beam. The diameter of the screw components (8) is 12-14mm, the strength grade is 6.8-10.9, and anti-loosening nuts are used.

7. The inter-slab connection node with enhanced seismic performance according to claim 1, characterized in that, The through bolt holes on the steel beam (7) are elliptical holes with a major axis of 14-16mm and a minor axis of 18-22mm. An elastic sealing gasket is added to the reserved interface between the overall frame (5) and the steel beam (7). The embedded pipeline (3) is a water, electricity and heating pipeline made of PVC, PE or PPR.

8. The inter-slab connection node for enhanced seismic performance according to claim 1, characterized in that, The overall frame (5) is integrated with the keel joint of the adjacent floor slab, and the joint of the adjacent floor slab is locked simultaneously when the screw component (8) is tightened; the overall frame (5), the top and bottom longitudinal distributed steel bars (4) and the top and bottom transverse distributed steel bars (4'), the screw component (8) and the pre-embedded pipeline (3) are prefabricated into standardized modules and are precisely assembled when leaving the factory.

9. A construction method based on the connection node described in any one of claims 1-8, characterized in that, The process includes factory prefabrication and on-site installation, with the specific steps as follows: (1) Factory prefabrication stage: a. Process the steel keel according to the design dimensions, remove rust from the keel, and process the reserved interface and screw through hole at the bottom of the overall frame (5) according to the cross-sectional dimensions of the steel beam (7); b. Use full welding process to weld the longitudinal and transverse keels to form an integral frame (5), and check the reserved interface size and screw hole position accuracy; c. Lay the top and bottom longitudinal distribution steel bars (4) and the top and bottom transverse distribution steel bars (4'), and fix them to the overall frame (5); d. Inject lightweight insulation material into the frame, and simultaneously embed the pre-embedded pipeline (3) in the reserved channel and fix it firmly; e. Pour high-strength lightweight concrete at the top and bottom, and cure it according to the standard until the concrete strength reaches the standard, thus completing the prefabrication of the single integral composite floor slab (1); (2) On-site installation stage: a. Clean up the construction site and level it, set up the construction scaffold, hoist the steel beam (7) into place and fix it firmly, and correct the horizontality, verticality and spacing of the steel beam; b. Hoist the prefabricated integral composite floor slab (1) above the steel beam (7) so that the reserved interface at the bottom of the integral frame (5) is connected with the flange of the steel beam (7) to ensure that the bolt holes are aligned. c. Insert the threaded rod component (8), insert the head of the threaded rod into the slot of the overall frame (5) and the steel beam (7), and tighten the nut to achieve bidirectional fixation of the floor slab and the steel beam; d. Check the connection gap between the integral composite floor slab (1) and the steel beam (7), and fill the joint with sealant if necessary; e. Connect the pre-buried pipeline (3) and debug it, clean up the construction site, and complete the overall installation.

10. The construction method according to claim 9, characterized in that, In step d of the factory prefabrication stage, the overall frame (5) is sealed before the lightweight insulation material is poured; in step e of the factory prefabrication stage, the accuracy of the reserved interface and screw hole of the integral composite floor slab (1) is checked before leaving the factory; in step c of the on-site installation stage, the nuts are tightened to the specified torque using a torque wrench or electric wrench.

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