Fabricated building steel structure energy-saving system

Abstract

The invention discloses a fabricated building steel structure energy-saving system. The system comprises a vertical load-bearing steel column, a horizontal load-bearing steel beam and a heat bridge blocking system cooperatively arranged on the steel column and the steel beam. The heat bridge blocking system is composed of a node heat bridge blocking unit, a component heat bridge blocking unit, a joint heat bridge blocking unit and a detachable upgrading unit. The node heat bridge blocking unit adopts a cooperative connection structure of a metal end plate, a non-metal heat insulation block and a through bolt to realize disconnection of a metal heat conduction path of a connection node and reliable load bearing; according to the component heat bridge blocking unit, a closed cavity and a heat insulation medium are arranged in non-key stress areas of a steel column and a steel beam, so that a heat conduction path is prolonged; the joint heat bridge blocking unit is provided with a hasp seat with a heat insulation insertion strip and a U-shaped groove with a sealing heat insulation assembly through a steel column and a steel beam. And a detachable upgrading unit. According to the system, a node-component-joint omnibearing heat bridge blocking system is formed, the energy-saving effect is remarkably improved, and the system is adaptive to the whole life cycle of a building.

Description

Technical Field

[0001] This invention relates to the field of steel structure energy-saving technology, and particularly to an energy-saving system for prefabricated building steel structures. Background Technology

[0002] Prefabricated steel structures are widely used in the construction industry due to their high construction efficiency, environmental friendliness, and excellent seismic performance. However, the strong thermal conductivity of steel structures and the significant thermal bridging effect have become a core bottleneck restricting their promotion in energy-efficient buildings. Existing thermal bridging solutions for prefabricated steel structures have many shortcomings, making it difficult to balance energy-saving effects, structural reliability, and compatibility with prefabricated construction methods.

[0003] Regarding the thermal bridging at the connection nodes between steel columns and steel beams, existing solutions are mainly divided into three categories.

[0004] One option is an external insulation layer solution, which involves wrapping insulation boards around the nodes and securing them with metal cable ties. However, this solution fails to completely block thermal bridges. The metal cable ties and connecting bolts can penetrate the insulation layer, forming invisible thermal bridges. Furthermore, the insulation layer is prone to falling off and aging over long-term use, leading to a significant reduction in insulation performance. In addition, the on-site wrapping construction process is cumbersome, has poor adaptability, and affects the efficiency of prefabricated construction.

[0005] The second option is to fill the gaps between nodes with insulating materials, such as foaming agents or insulating adhesives. However, these materials have low compressive strength and cannot effectively transfer the load at the nodes. Additional metal connectors are required, which in turn create thermal bridges. Furthermore, adhesive materials are prone to aging and cracking, which can lead to heat leakage and a rebound of the thermal bridge effect.

[0006] The third option is a simple metal separation scheme, which uses non-metallic gaskets to separate the steel beams and columns. However, this only achieves a simple physical separation and lacks a reliable mechanical locking structure. The shear and torsional resistance of the joints is insufficient, which cannot meet the load-bearing requirements of the steel structure. Furthermore, the gaskets are prone to displacement, resulting in uneven stress on the joints and potential safety hazards. At the same time, the gaps in the planar contact are prone to air convection, resulting in limited thermal insulation. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing an energy-saving prefabricated building steel structure system.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An energy-saving system for prefabricated steel structures includes vertically load-bearing steel columns and horizontally load-bearing steel beams, and further includes a thermal bridge blocking system cooperatingly installed on the steel columns and steel beams; the thermal bridge blocking system includes:

[0010] Nodal thermal bridge blocking unit: installed at the connection node between steel column and steel beam, it is a mechanically disconnected thermal bridging structure;

[0011] Thermal bridge blocking unit: integrated into the body of steel columns and steel beams, it is a cavity thermal insulation structure with optimized cross-section;

[0012] Joint thermal bridge blocking unit: installed at the splicing joints of steel columns and steel beams with prefabricated enclosure modules, forming a sealed thermal bridge collaborative structure. The joint between the steel column and the prefabricated wall panel is provided with an L-shaped fastener with thermal insulation strip, and the joint between the steel beam and the roof module is provided with a U-shaped groove with sealing and thermal insulation components.

[0013] Detachable upgrade unit: Corresponding to the node thermal bridge blocking unit, component thermal bridge blocking unit and joint thermal bridge blocking unit, including standardized bolt interface, positioning pin hole, pull-out guide rail and pluggable slot, to realize the detachable replacement of each thermal bridge blocking module.

[0014] Preferably, the node thermal bridge blocking unit includes a left metal end plate fixed to the end of the steel beam, a right metal flange plate fixed to the side of the steel column, and a non-metallic heat insulation block sandwiched between the left metal end plate and the right metal flange plate; the contact surfaces of the left metal end plate and the non-metallic heat insulation block, and the contact surfaces of the right metal flange plate and the non-metallic heat insulation block are provided with a tenon and mortise structure, and are fastened by through bolts to realize the mechanical connection between the steel column and the steel beam and the disconnection of the metal heat conduction path.

[0015] Preferably, the component thermal bridge blocking unit includes a closed honeycomb cavity in the non-critical load-bearing web area of ​​the steel column, with a thermal insulation medium embedded in the cavity; and a detachable thermal insulation component in the mid-span web area of ​​the steel beam.

[0016] Preferably, the detachable heat insulation component includes an abutting heat insulation plate and a fixing box. There are two abutting heat insulation plates, which are fixedly connected by a spring. There are multiple fixing boxes, which are evenly fixed on the abutting heat insulation plates. The web area of ​​the mid-span section of the steel beam has multiple openings for the fixing boxes to be engaged. The fixing boxes are filled with heat insulation medium. The web area of ​​the mid-span section of the steel beam has mounting grooves for installing the abutting heat insulation plates.

[0017] Preferably, the L-shaped latch is welded and fixed to the outer side of the steel column flange plate, and an insert groove is opened on its inner side. The heat insulation insert is an integrally molded structure of glass fiber reinforced plastic and elastic sealant. The side of the prefabricated wall panel is reserved with a slot that matches the L-shaped latch, and an elastic sealing gasket is pasted on the inner side of the slot. The wall panel and the latch are fastened by self-tapping bolts.

[0018] Preferably, the U-shaped groove is located at the center of the top of the upper flange of the steel beam and extends along the length of the steel beam. The groove is filled with water-swellable sealing strips and rigid heat-insulating foam from bottom to top. The end of the roof module is provided with an L-shaped metal overlap edge, and a non-metallic heat-insulating pad is pasted below the overlap edge and fixed to the top of the U-shaped groove by high-strength bolts.

[0019] Preferably, the non-metallic heat insulation block is made of glass fiber reinforced plastic or ceramic matrix composite material, and the heat insulation medium is vacuum insulation board or high-density rock wool.

[0020] Preferably, the outer shell of the fixing box is made of non-metallic composite material, and a spring-type locking pin is provided between the heat insulation plate and the web plate of the mid-span section of the steel beam.

[0021] Preferably, the standardized bolt interface and the positioning pin hole are respectively disposed on the left metal end plate, the right metal flange plate and the non-metallic heat insulation block, the positioning pin hole is located inside the bolt interface, and the pluggable slot is respectively disposed between the L-shaped buckle seat and the heat insulation strip.

[0022] The present invention has the following beneficial effects:

[0023] 1. This system breaks the metal heat conduction path at the connection nodes of steel columns and steel beams through node thermal bridge blocking units, weakens the heat conduction of the steel columns and steel beams through component thermal bridge blocking units, and solves the problem of heat leakage from gaps and metal fastener thermal bridges at the joints of the enclosure modules through joint thermal bridge blocking units, thus slowing down the heat transfer and reducing building energy consumption.

[0024] 2. The node thermal bridge blocking unit adopts a mortise and tenon structure and through bolts for coordinated fastening, so as to achieve reliable engagement between the non-metallic thermal insulation block and the metal end plate and the steel column flange plate. This not only ensures the mechanical connection strength between the steel column and the steel beam and meets the load-bearing requirements of the steel structure, but also blocks heat conduction through the non-metallic thermal insulation block, thus solving the contradiction between thermal insulation and load-bearing in the existing technology.

[0025] 3. The component thermal bridge blocking unit opens cavities in non-critical load-bearing areas of steel columns and beams to avoid weakening the core load-bearing capacity of the components and ensure structural safety and stability. At the same time, the heat transfer is hindered, making the wiring slow down when heat is dissipated.

[0026] 4. The standardized interface design of the detachable upgrade unit of this device allows for easy disassembly and replacement of various thermal bridge blocking modules at nodes, components, and joints. In the future, when the insulation material ages and needs to be upgraded to a higher performance insulation component, there is no need to damage the main structure of the steel column or steel beam; only the functional modules need to be replaced. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall device structure proposed in this invention;

[0028] Figure 2 This is a schematic diagram of the enlarged structure of the node thermal bridge blocking unit proposed in this invention;

[0029] Figure 3 The present invention proposes Figure 1 Enlarged structural diagram at point A in the diagram;

[0030] Figure 4 This is an exploded structural diagram of the steel beam position in the component thermal bridge blocking unit proposed in this invention;

[0031] Figure 5 This is a schematic diagram of the L-shaped fastener connection structure on the steel column proposed in this invention;

[0032] Figure 6 This is a schematic diagram of the U-shaped groove connection structure on the steel beam proposed in this invention;

[0033] Figure 7 This is an enlarged schematic diagram of the L-shaped hook and loop fastener proposed in this invention.

[0034] In the diagram: 1. Steel column; 2. Steel beam; 3. Thermal bridge blocking system; 31. Node thermal bridge blocking unit; 311. Left metal end plate; 312. Right metal flange plate; 313. Non-metallic thermal insulation block; 314. Mortise and tenon structure; 315. Boss; 32. Component thermal bridge blocking unit; 321. Honeycomb cavity; 322. Thermal insulation medium; 323. Removable thermal insulation component; 3231. Abutting thermal insulation board; 3232. Fixing box; 33. Joint thermal bridge blocking unit; 331. L-shaped fastener; 332. Thermal insulation strip; 333. U-shaped groove; 334. Waterstop strip; 335. Rigid thermal insulation foam. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] An energy-saving prefabricated building steel structure system includes vertically load-bearing steel columns 1 and horizontally load-bearing steel beams 2, and further includes a thermal bridge blocking system 3 cooperatingly installed on the steel columns 1 and steel beams 2; the thermal bridge blocking system 3 includes:

[0037] Node thermal bridge blocking unit 31: Located at the connection node between steel column 1 and steel beam 2, it is a mechanically disconnected thermal bridging structure. The node thermal bridge blocking unit 31 includes a left metal end plate 311 fixed to the end of steel beam 2, a right metal flange plate 312 fixed to the side of steel column 1, and a non-metallic thermal insulation block 313 sandwiched between the left metal end plate 311 and the right metal flange plate 312. The contact surfaces between the left metal end plate 311 and the non-metallic thermal insulation block 313, and between the right metal flange plate 312 and the non-metallic thermal insulation block 313... The contact surfaces of the steel column 1 and the steel beam 2 are provided with a tenon and mortise structure 314, and are fastened by through bolts to realize the mechanical connection and disconnection of the metal heat conduction path. The tenon and mortise structure 314 includes protrusions 315 on both sides of the non-metallic heat insulation block 313, and grooves corresponding to the left metal end plate 311 and the right metal flange plate 312. The non-metallic heat insulation block 313 is made of glass fiber reinforced plastic or ceramic matrix composite material, and the heat insulation medium 322 is vacuum insulation board or high-density rock wool.

[0038] The specific connection process is as follows: 1. The left metal end plate 311 is fixed to the end of the steel beam 2 by welding, forming a load-bearing carrier on the side of the steel beam 2. The welding position avoids the critical stress area of ​​the flange of the steel beam 2 to ensure that the weld and the steel beam 2 body are stressed together; 2. The right metal flange plate 312 is fixed to a preset position on the side of the steel column 1 by welding, serving as a load-bearing carrier on the side of the steel column 1. Before welding, the positioning is ensured by scribing to ensure precise alignment with the hole position and tenon structure of the left metal end plate 311; 3. The non-metallic heat insulation block 313 is sandwiched between the left metal end plate 311 and the right metal flange plate 312. The concave and convex tenon structures 314 on both sides of the block precisely engage with the corresponding grooves of the left and right metal plates to achieve horizontal and vertical positioning limits; 4. Through bolts are used to pass through the left metal end plate 311, the non-metallic heat insulation block 313, and the right metal flange plate 312 in sequence. The nuts are tightened to generate axial pressure, tightly fitting the three together to complete the connection and assembly.

[0039] The connection node between steel column 1 and steel beam 2 is a core thermal bridge area in the building's steel structure, where heat is easily and rapidly conducted through direct metal contact. Installing the node thermal bridge blocking unit 31 here offers the following key benefits: 1. Completely disconnecting the metal heat conduction path: Through the physical isolation of the non-metallic insulation block 313, heat conduction between steel beam 2 and steel column 1 through direct metal contact is prevented, blocking the main thermal bridge at the node from the source; 2. Reducing the thermal bridge diffusion effect: The tight fit structure formed by the tenon and mortise joints and bolt fastening reduces air gaps at the contact surface, preventing secondary thermal bridges caused by air convection and further improving the thermal bridge blocking effect; 3. A thermal bridge blocking design adapted to the node's stress characteristics: The connection method ensures both the node's shear and torsional load-bearing capacity and achieves thermal bridge blocking, resolving the contradiction of traditional nodes where "load-bearing necessarily leads to heat conduction," ensuring both structural safety and energy efficiency.

[0040] The core thermal insulation medium 322 of this unit is a non-metallic thermal insulation block 313, made of glass fiber reinforced plastic or ceramic matrix composite material. Its beneficial effects are: 1. Low thermal conductivity, effectively blocking heat transfer and preventing heat conduction between metals, ensuring the core requirement of thermal bridge blocking from a material perspective; 2. High compressive strength, capable of withstanding the tightening pressure of through bolts and the load transmitted at the joint, without breakage or deformation due to stress, ensuring the structural stability of the connection joint; 3. Excellent aging resistance and corrosion resistance, matching the service life of the steel structure, ensuring that the thermal insulation performance will not decline due to material aging during long-term use, guaranteeing the long-term stability of the thermal bridge blocking effect; 4. Good processing adaptability, allowing for precise processing of the mortise and tenon structure 314 to match the metal plate, ensuring the accuracy and fit of the connection with the steel beam 2 and steel column 1.

[0041] Thermal bridge blocking unit 32: Integrated into the body of steel column 1 and steel beam 2, it is a cavity thermal insulation structure with optimized cross section. The non-critical load-bearing web area of ​​the steel column 1 is provided with a closed honeycomb cavity 321, and the cavity is filled with thermal insulation medium 322; the mid-span web area of ​​the steel beam 2 is provided with a detachable thermal insulation component 323.

[0042] The detachable heat insulation component 323 includes an abutting heat insulation plate 3231 and a fixing box 3232. There are two abutting heat insulation plates 3231, which are fixedly connected by springs. There are multiple fixing boxes 3232, which are evenly fixed on the abutting heat insulation plates 3231. The mid-span web area of ​​the steel beam 2 has multiple openings for the fixing boxes 3232 to be engaged. The fixing box 3232 is filled with heat insulation medium 322. The mid-span web area of ​​the steel beam 2 has mounting grooves for the abutting heat insulation plates 3231 to be installed. The outer shell of the fixing box 3232 is made of non-metallic composite material, and a spring-loaded locking pin is provided between the abutting heat insulation plate 3231 and the mid-span web of the steel beam 2.

[0043] The specific connection methods are as follows: 1. Steel column 1 side: A closed honeycomb cavity 321 is opened in the non-critical load-bearing web area of ​​steel column 1. The heat insulation medium 322 is embedded through the reserved opening in the cavity and then fixed to the web of steel column 1 by welding or bolting with a closed cover plate to form an integrated heat insulation structure with the steel column 1 body. If it is a square tube steel column 1, the longitudinal heat insulation baffle is fixed to the inner wall of the square tube by steel clamps. A heat insulation gasket is placed between the clamp and the baffle to avoid the clamp forming a local thermal bridge. 2. Steel beam 2 side: A detachable heat insulation component 323 is embedded in the installation groove of the web of steel beam 2 in the middle span. The two abutting heat insulation plates 3231 of the component abut against the inner wall of the installation groove by spring elasticity. The fixing box 3232 is snapped into the opening of the web of steel beam 2 by spring elasticity. Then, a spring-type locking pin passes through the locking hole between the abutting heat insulation plate 3231 and the inner wall of the installation groove to realize the detachable fixing of the component to steel beam 2.

[0044] The steel column 1 and steel beam 2 are the main carriers of heat diffusion within the building structure, and their continuous metal structure in the web area is prone to forming long-distance thermal bridges. Installing the component thermal bridge blocking unit 32 here offers the following key benefits: 1. Extending the heat conduction path: The combination of the sealed honeycomb cavity 321 and the detachable insulation component 323 divides the continuous web of the steel column 1 and steel beam 2 into discontinuous areas. Heat transfer must bypass the cavity edges, significantly extending the heat conduction path and reducing heat conduction efficiency; 2. Targeted blocking of the main thermal bridges: The unit is installed in the non-critical load-bearing areas of the steel column 1 and steel beam 2, precisely covering the main heat conduction channels on the component without affecting the main load-bearing performance, achieving full-area thermal bridge reduction at the component level; 3. Adapting to the thermal expansion and contraction characteristics of the component: The elastic abutment connection on the side of steel beam 2 can adapt to the slight thermal expansion and contraction deformation of steel beam 2 during operation, avoiding gaps between the insulation component and steel beam 2, preventing secondary thermal bridges formed by air convection, and ensuring stable insulation performance.

[0045] The thermal insulation medium 322 used in this unit includes vacuum insulation panels, high-density rock wool, and the filling thermal insulation medium 322 within the fixing box 3232 of the removable thermal insulation component 323. Its beneficial effects are as follows: 1. Vacuum insulation panel: With extremely low thermal conductivity, it can effectively block heat transfer in the web area of ​​the steel column 1. It is also small in size and lightweight, and its embedding in the honeycomb cavity 321 does not significantly increase the weight of the steel column 1. The vacuum environment eliminates air convection, avoiding the thermal performance degradation problem caused by air convection in traditional thermal insulation materials. 2. High-density rock wool: With good filling properties, it can tightly fit the internal space of the square tube steel column 1, achieving full-fill thermal insulation of the cavity and blocking thermal bridges generated by air convection within the tube. It has excellent high-temperature resistance and fire resistance, improving the fire safety of the steel structure, while also possessing good sound insulation, balancing energy saving and comfort. 3. The fixing box 3232 is filled with heat insulation medium 322: it works in conjunction with the heat insulation plate 3231 to form a closed heat insulation space and block the heat conduction of the web of the steel beam 2; the material is adapted to the modular installation requirements and can be easily replaced with the fixing box 3232 to ensure long-term heat insulation effect.

[0046] Joint thermal bridge blocking unit 33: It is set at the splicing joint of steel column 1 and steel beam 2 with prefabricated enclosure module respectively. It is a sealed thermal bridge cooperative structure. The joint of steel column 1 with prefabricated wall panel is provided with L-shaped fastener 331 with heat insulation strip 332. The joint of steel beam 2 with roof module is provided with U-shaped groove 333 with sealing heat insulation component.

[0047] The L-shaped latch seat 331 is welded and fixed to the outer side of the flange plate of the steel column 1, and a groove for inserting strips is opened on its inner side. The heat insulation insert 332 is an integrally molded structure of glass fiber reinforced plastic and elastic sealant. The side of the prefabricated wall panel is reserved with a slot that matches the L-shaped latch seat 331. An elastic sealing gasket is pasted on the inner side of the slot, and the wall panel and the latch seat are fastened by self-tapping bolts.

[0048] The U-shaped groove 333 is located at the center of the top of the upper flange of the steel beam 2 and extends along the length of the steel beam 2. The groove is filled with water-swellable sealing strip 334 and rigid heat insulation foam 335 from bottom to top. The end of the roof module is provided with an L-shaped metal overlap edge. A non-metallic heat insulation pad is pasted below the overlap edge and is pressed and fixed above the U-shaped groove 333 by high-strength bolts.

[0049] The specific connection methods are as follows: 1. At the joint between steel column 1 and precast wall panel: L-shaped fastener 331 is fixed to the outer side of the flange plate of steel column 1 by welding. A groove for inserting strips is opened on the inner side of the fastener, and the thermal insulation strip 332 is embedded in the groove for fixation. After the slot on the side of the precast wall panel is precisely engaged with the L-shaped fastener 331, self-tapping bolts are used to pass through the slot from the outside of the wall panel and fasten it to the fastener, realizing the integrated connection of steel column 1, wall panel and joint thermal insulation structure. 2. At the joint between steel beam 2 and roof module: U-shaped groove 333 is directly opened in the center of the top of the upper flange of steel beam 2 and is set along the length of steel beam 2. Water-swellable waterstop strip 334 and rigid thermal insulation foam 335 are laid in the groove in sequence. The L-shaped metal overlap edge at the end of the roof module covers the U-shaped groove 333 and is fastened to the two side walls of the U-shaped groove 333 by high-strength bolts passing through the overlap edge, realizing the tight connection of steel beam 2, roof module and joint thermal insulation structure.

[0050] The core benefits include: 1. Dual-layer thermal bridge blocking: Thermal bridges between steel beams 2, steel columns 1, and the enclosure module are blocked by thermal insulation strips 332 and rigid thermal insulation foam 335, while a sealing structure fills the joint gaps to prevent thermal bridges caused by air convection. 2. Simultaneous resolution of leakage and thermal bridge issues: The water-swellable sealing strips 334 and elastic sealing gaskets not only block thermal bridges but also achieve waterproof sealing of the joints, preventing structural corrosion and performance degradation of the insulation materials caused by rainwater infiltration, indirectly ensuring long-term thermal bridge blocking effectiveness. 3. Stable connection based on the load-bearing capacity of steel beams 2 and steel columns 1: No additional supporting components are needed. The structural strength of steel beams 2 and steel columns 1 ensures the installation stability of the joint insulation structure, avoiding detachment or deformation caused by insufficient support in traditional joint insulation structures.

[0051] The thermal insulation medium 322 used in this unit includes thermal insulation strips 332, rigid thermal insulation foam 335, and non-metallic thermal insulation gaskets. Its beneficial effects are as follows: 1. Thermal insulation strips 332: Made of glass fiber reinforced plastic and elastic sealant in one piece, it has both thermal insulation and sealing properties. Its elastic deformation characteristics can fill tiny gaps in the joints, blocking heat transfer and preventing air infiltration; it precisely matches the strip groove of the L-shaped fastener 331, ensuring a secure installation and preventing it from easily falling off. 2. Rigid thermal insulation foam 335: With a low thermal conductivity, it effectively blocks heat conduction between the upper flange of the steel beam 2 and the metal overlap edge of the roof module; it has high structural strength, can withstand the tightening force of high-strength bolts, and will not deform excessively under stress, ensuring the tightness of the joint connection; it has good weather resistance, can adapt to changes in outdoor temperature and humidity, and will not age or powder after long-term use. 3. Non-metallic thermal insulation pad: placed between the metal overlap edge and steel beam 2, further blocking direct heat conduction between metals, avoiding the formation of local thermal bridges at the bolt fastening points, and enhancing the overall thermal insulation effect at the joint.

[0052] Detachable upgrade unit 34: Correspondingly set in node thermal bridge blocking unit 31, component thermal bridge blocking unit 32 and joint thermal bridge blocking unit 33, including standardized bolt interface, positioning pin hole, pull-out guide rail and pluggable slot, to realize the detachable replacement of each thermal bridge blocking module.

[0053] The standardized bolt interface and the positioning pin hole are respectively set on the left metal end plate 311, the right metal flange plate 312 and the non-metallic heat insulation block 313. The positioning pin hole is located inside the bolt interface. The pluggable slot is respectively set between the L-shaped buckle seat 331 and the heat insulation strip 332.

[0054] The detachable upgrade unit 34 itself does not directly block thermal bridges, but it indirectly achieves a continuous and stable thermal bridge blocking effect by ensuring the long-term effective performance of the other three thermal bridge blocking units. The core benefits of installing this unit include: 1. Ensuring the long-term stability of the thermal bridge blocking effect: Through standardized detachable interfaces, aged or damaged insulation media 322 or modules can be easily replaced, avoiding a rebound of the thermal bridge effect due to the degradation of insulation material performance; 2. Adapting to energy-saving standard upgrade requirements: By replacing with higher-performance insulation modules, the thermal bridge blocking effect can be further improved without damaging the main structure of steel beams 2 and steel columns 1, achieving dynamic thermal bridge optimization throughout the building's entire lifecycle; 3. Reducing secondary thermal bridges during operation and maintenance: When replacing modules, there is no need to cut or weld steel beams 2 and steel columns 1, avoiding the creation of new thermal bridges due to damage to the original structure during operation and maintenance, and ensuring the integrity of the overall thermal bridge blocking system 3.

[0055] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prefabricated building steel structure energy-saving system, comprising vertically load-bearing steel columns (1) and horizontally load-bearing steel beams (2), characterized in that: It also includes a thermal bridge blocking system (3) cooperatingly installed on the steel column (1) and the steel beam (2); the thermal bridge blocking system (3) includes: Node thermal bridge blocking unit (31): It is set at the connection node between the steel column (1) and the steel beam (2) and is a mechanically disconnected thermal bridging structure; Component thermal bridge blocking unit (32): The body integrated into the steel column (1) and steel beam (2) is a cavity thermal insulation structure with optimized cross section; Joint thermal bridge blocking unit (33): It is set at the splicing joint of the steel column (1) and the steel beam (2) with the prefabricated enclosure module, and is a sealed thermal bridge cooperative structure. The joint of the steel column (1) and the prefabricated wall panel is provided with an L-shaped fastener (331) with thermal insulation strip (332), and the joint of the steel beam (2) and the roof module is provided with a U-shaped groove (333) with sealing thermal insulation component. Detachable upgrade unit: Correspondingly set in node thermal bridge blocking unit (31), component thermal bridge blocking unit (32) and joint thermal bridge blocking unit (33), including standardized bolt interface, positioning pin hole, pull-out guide rail and pluggable slot, to realize the detachable replacement of each thermal bridge blocking module.

2. The prefabricated building steel structure energy-saving system according to claim 1, characterized in that, The node thermal bridge blocking unit (31) includes a left metal end plate (311) fixed to the end of the steel beam (2), a right metal flange plate (312) fixed to the side of the steel column (1), and a non-metallic heat insulation block (313) sandwiched between the left metal end plate (311) and the right metal flange plate (312). The contact surfaces of the left metal end plate (311) and the non-metallic heat insulation block (313) and the contact surfaces of the right metal flange plate (312) and the non-metallic heat insulation block (313) are provided with a mortise and tenon structure (314), and are fastened by through bolts to realize the mechanical connection between the steel column (1) and the steel beam (2) and the disconnection of the metal heat conduction path. The mortise and tenon structure (314) includes a boss (315) on both sides of the non-metallic heat insulation block (313) and a groove correspondingly opened on the left metal end plate (311) and the right metal flange plate (312).

3. The prefabricated building steel structure energy-saving system according to claim 1, characterized in that, The component thermal bridge blocking unit (32) includes a closed honeycomb cavity (321) in the non-critical load-bearing web area of ​​the steel column (1), and a heat insulation medium (322) embedded in the cavity; and a detachable heat insulation component (323) in the mid-span web area of ​​the steel beam (2).

4. The prefabricated building steel structure energy-saving system according to claim 3, characterized in that, The detachable heat insulation component (323) includes an abutting heat insulation plate (3231) and a fixing box (3232). There are two abutting heat insulation plates (3231) and they are fixed together by springs. There are multiple fixing boxes (3232) and they are evenly fixed on the abutting heat insulation plates (3231). The mid-span web area of ​​the steel beam (2) has multiple openings for the fixing boxes (3232) to be snapped into. The fixing box (3232) is filled with heat insulation medium (322). The mid-span web area of ​​the steel beam (2) has an installation groove for the abutting heat insulation plate (3231) to be installed.

5. The prefabricated building steel structure energy-saving system according to claim 1, characterized in that, The L-shaped latch seat (331) is welded and fixed to the outer side of the flange plate of the steel column (1), and a groove for insert strip is opened on its inner side. The heat insulation insert strip (332) is an integrally molded structure of glass fiber reinforced plastic and elastic sealant. The side of the prefabricated wall panel is reserved with a slot that matches the L-shaped latch seat (331). An elastic sealing gasket is pasted on the inner side of the slot. The wall panel and the latch seat are fastened by self-tapping bolts.

6. The prefabricated building steel structure energy-saving system according to claim 1, characterized in that, The U-shaped groove (333) is located at the center of the top flange of the steel beam (2) and extends along the length of the steel beam (2). The groove is filled with water-swellable sealing strip (334) and rigid heat insulation foam (335) from bottom to top. The end of the roof module is provided with an L-shaped metal overlap edge. A non-metallic heat insulation pad is pasted below the overlap edge and is pressed and fixed above the U-shaped groove (333) by high-strength bolts.

7. The prefabricated building steel structure energy-saving system according to claim 2, characterized in that, The non-metallic heat insulation block (313) is made of glass fiber reinforced plastic or ceramic matrix composite material, and the heat insulation medium (322) is a vacuum insulation board or high-density rock wool.

8. The prefabricated building steel structure energy-saving system according to claim 4, characterized in that, The outer shell of the fixing box (3232) is made of non-metallic composite material, and a spring-type locking pin is provided between the heat insulation plate (3231) and the mid-span web of the steel beam (2).

9. The prefabricated building steel structure energy-saving system according to claim 1, characterized in that, The standardized bolt interface and the positioning pin hole are respectively set on the left metal end plate (311), the right metal flange plate (312) and the non-metallic heat insulation block (313). The positioning pin hole is located inside the bolt interface. The pluggable slot is respectively set between the L-shaped buckle seat (331) and the heat insulation strip (332).

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