Building outer wall non-thermal bridge connecting node structure and installation method

Abstract

This application provides a structure and installation method for a thermal bridge-free connection node for building exterior walls, belonging to the technical field of thermal bridge connection structures for building exterior walls. It includes a precast wall, with the outer side of the precast wall being the indoor side and the inner side being the outdoor side, and a thermal inertia matching layer disposed on the inner side of the insulation board. This structure and installation method for a thermal bridge-free connection node for building exterior walls solves the defects of traditional exterior wall joints, such as significant thermal bridging effects at the connectors, thermal stress cracking at the interfaces of different materials due to abrupt changes in thermal conductivity, and the difficulty in balancing mechanical connection and thermal performance, by placing the thermal inertia matching layer between the insulation board and the cement backing board. It achieves the goal of completely blocking heat conduction along the axial direction of the connector while meeting structural load-bearing requirements, and ensuring smooth heat flow transition between structural layers, significantly improving the energy-saving performance and long-term stability of the exterior wall insulation system.

Description

Technical Field

[0001] This application belongs to the technical field of thermal bridge connection structure for building exterior walls, and provides a structure and installation method for building exterior walls without thermal bridge connection nodes. Background Technology

[0002] As building energy efficiency standards gradually improve, near-zero energy buildings place higher demands on the thermal performance of exterior wall insulation systems. The thermal bridging effect at exterior wall joints (such as window openings, balcony slabs, and precast wall panel joints) is a major bottleneck restricting the insulation effect. Thermal bridging not only leads to heat loss and increased energy consumption, but also easily causes quality problems such as indoor condensation, mold growth, and insulation layer detachment.

[0003] Existing technologies already include structural designs for thermal bridge-free joints. For example, invention patent CN114382197B discloses a near-zero energy building exterior wall thermal bridge-free fireproof insulation joint, which connects to the wall through a thermal bridge breaking structure and a limiting mechanism, and is equipped with a cement backing plate and an exterior panel. However, in this prior art, the connectors (insertion columns and positioning plates) directly pass through the insulation layer and are inserted into the wall. The connectors themselves are not locally insulated, and heat can still be conducted along the axial direction of the connectors, forming thermal bridges.

[0004] Meanwhile, the existing technology uses a spring-loaded limiting plate for axial locking, which is structurally complex and prone to loosening due to spring fatigue after long-term use. Furthermore, in this prior art, the insulation layer and the cement backing board are in direct contact, and the significant difference in their thermal conductivity makes the interface susceptible to thermal stress under long-term temperature cycling, leading to cracking or delamination. Additionally, the existing methods of fixing the connectors to the wall lack reliable radial locking and gap compensation mechanisms. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this application provides a structure and installation method for building exterior walls without thermal bridge connections, which can effectively solve the technical problems of "significant thermal bridge effect, interface thermal stress cracking caused by abrupt change in thermal conductivity between the insulation layer and the cement backing board, and complex connection structure and inconvenient installation" in existing technologies.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] This application discloses a structure and installation method for a thermal bridge-free connection node for a building exterior wall, including a precast wall, wherein the outer side of the precast wall is the interior side and the inner side of the precast wall is the exterior side, and further includes:

[0008] Insulation boards are installed on the inner side of the precast wall;

[0009] A thermal inert matching layer is disposed on the inner side of the insulation board;

[0010] A cement backing board is disposed inside the thermal inertia matching layer, wherein the thermal conductivity of the thermal inertia matching layer is between that of the insulation board and that of the cement backing board.

[0011] A decorative panel is disposed on the inner side of the cement backing board;

[0012] The thermally broken connection assembly passes sequentially through the cement backing plate, the thermal inert matching layer and the insulation board, and forms a connection with the precast wall.

[0013] The thermal break connection assembly includes a columnar connector. The outer end of the columnar connector is provided with a plug-in end, and the inner end is provided with a locking end. The plug-in end is inserted into a pre-fabricated locking groove preset in the prefabricated wall through a thermal insulation clamping assembly. The locking end is equipped with a locking device.

[0014] Furthermore, a heat-insulating sleeve is fitted in the middle section of the cylindrical connector, and the heat-insulating sleeve covers at least the thickness range of the insulation board;

[0015] The heat-insulating clamping assembly is disposed in the prefabricated locking groove, and has a slot for inserting and engaging with the plug-in end, and an inclined locking shaft that can move radially relative to the plug-in end; the plug-in end has a locking groove corresponding to the inclined locking shaft; the side of the inclined locking shaft facing the plug-in end is inclined, and when the plug-in end is inserted into the slot, the inclined surface abuts against the end of the plug-in end and drives the inclined locking shaft to move radially away. After the plug-in end is inserted into place, the inclined locking shaft is automatically attracted into the locking groove by magnetic force to achieve axial locking.

[0016] In summary, the technical solution provided in this application has at least one of the following advantages compared with the prior art:

[0017] The structure and installation method of the thermal bridge-free connection node of the building's exterior wall solves the defects of traditional exterior wall nodes, such as significant thermal bridge effect at the connection, thermal stress cracking at the interface of different materials due to abrupt changes in thermal conductivity, and difficulty in balancing mechanical connection and thermal performance. This is achieved by setting a thermal inert matching layer between the insulation board and the cement backing board with a thermal insulation sleeve covering at least the entire thickness of the insulation board in the middle section of the column connector. The connection node completely blocks the heat conduction along the axial direction of the connector while meeting the structural load requirements, and makes the heat flow between the various structural layers smooth, which significantly improves the energy-saving performance and long-term stability of the exterior wall insulation system.

[0018] By installing a heat-insulating clamping component within a prefabricated locking groove, this component features a radially movable inclined locking shaft with corresponding locking grooves on the insertion end. Axial locking is achieved through inclined guidance and automatic magnetic adsorption, solving the problems of unreliable connector fixing methods and lack of feedback during installation in existing technologies. During insertion, the inclined locking shaft is pushed open, and after reaching the correct position, it is magnetically locked. Construction personnel can confirm proper installation without tools, and the locked position tightens with increasing pull, exhibiting excellent anti-seismic and anti-loosening performance.

[0019] The thermal insulation clamping assembly also includes a thermal insulation piston disc that engages with the inclined block. The cavity behind the piston disc is filled with a thermal expansion medium, and the end face of the thermal insulation jacket is coated with a carbon nanotube coating. When the external wall temperature changes, the thermal expansion medium pushes the piston disc to move, further pressing the inclined locking shaft through the engagement of the ball head protrusion with the inclined block. This achieves temperature adaptive compensation, effectively offsetting the gaps caused by thermal expansion and contraction of the connectors due to day-night temperature differences or seasonal changes, and reducing manual maintenance.

[0020] The thermal insulation sleeve is installed only in the section where the connector passes through the insulation board and completely covers its thickness, avoiding material waste. Simultaneously, both ends of the sleeve extend into or abut against adjacent structural layers, forming a continuous thermal resistance barrier. A thermal inertia matching layer causes a stepwise increase in thermal conductivity, significantly reducing the interface temperature gradient. Nuts are embedded in grooves on the back of the decorative panel, with no exposed metal from the outdoor side, combining aesthetics and rust prevention. Sealing structures are installed at the through-holes to prevent air leakage and rainwater intrusion, further improving the airtightness and insulation effect of the joint. Attached Figure Description

[0021] Figure 1 This is a front-view stereoscopic structural diagram of this application;

[0022] Figure 2 This is a three-dimensional structural diagram of the present application under partial cross-section.

[0023] Figure 3 This is a partial cross-sectional structural diagram of this application;

[0024] Figure 4 This is a partial three-dimensional structural diagram of the relevant components at the thermal insulation clamping assembly in this application;

[0025] Figure 5 This is a three-dimensional structural diagram of the relevant components at the thermal insulation clamping assembly in this application;

[0026] Figure 6 This is a partially exploded three-dimensional structural view of the relevant components at the thermal break connection assembly in this application;

[0027] Figure 7 This is a graph showing the thermal conductivity distribution of the thermal inert matching layer in this application.

[0028] Figure 8This is a flowchart of the installation method in this application.

[0029] The labels in the diagram represent:

[0030] 1. Precast wall; 101. Precast locking groove; 11. Insulation board; 12. Thermal inertia matching layer; 13. Cement backing board; 14. Adhesive layer; 15. Decorative panel;

[0031] 2. Thermal break connection assembly; 21. Columnar connector; 22. Plug-in end; 23. Locking end; 24. Locking fastener; 25. Thermal insulation sleeve;

[0032] 3. Thermal insulation clamping assembly; 31. Thermal insulation jacket; 311. Annular groove surface; 32. Slot; 33. Limiting optical axis; 34. Limiting plate; 341. Inclined block; 342. Inclined locking shaft; 343. Locking groove; 35. Thermal insulation piston disc; 351. Ball head protrusion; 352. Return spring. Detailed Implementation

[0033] The present application will be further described below with reference to embodiments.

[0034] Example 1

[0035] like Figure 1 , Figure 2 and Figure 3 As shown in the figure, this embodiment provides a structure for building exterior walls without thermal bridge connection nodes.

[0036] It should be noted that all the accompanying drawings in this application are for illustrative purposes only, thus only showing a portion of the walls, layered structures, etc.; in practical applications, the content of this technical solution and actual construction requirements must be considered; furthermore, if... Figure 3 As shown, the left side is the indoor side and the right side is the outdoor side. The arrows in the figure point from left to right, representing the direction of heat flow from the indoor side to the outdoor side. The structural layers of this application are arranged sequentially along this heat flow direction to achieve step-by-step heat blocking.

[0037] Specifically, the precast wall 1 is made of reinforced concrete, with its outer side being the indoor side and its inner side being the outdoor side. During the pouring of the precast wall 1, the precast locking groove 101 is pre-set in a predetermined position, and the thermal insulation clamping component 3 is precast and assembled into the precast locking groove 101. The opening of the precast locking groove 101 faces the outdoor side.

[0038] The insulation board 11 is attached to the inner side of the precast wall 1. The outer side of the insulation board 11 is sequentially provided with a thermal inertia matching layer 12, a cement backing board 13, and a decorative panel 15. The thermal inertia matching layer 12 has a thermal conductivity between that of the insulation board 11 and the cement backing board 13. Its function is to alleviate the interfacial thermal stress caused by the sudden change in thermal conductivity and to prevent cracking or delamination under long-term temperature cycling.

[0039] Furthermore, combined Figure 7 As shown, the figure illustrates the thermal conductivity distribution curves of each structural layer. It is clear from the figure that the thermal conductivity of the insulation board 11 is relatively low, the thermal conductivity of the cement backing board 13 is relatively high, and the thermal inertia matching layer 12 lies precisely in between, forming a gentle, stepped transition curve rather than a steep jump. This gradual distribution of thermal conductivity prevents heat from drastically accumulating at a single interface as it passes through different material layers, thereby reducing the risk of thermal stress concentration.

[0040] In practice, the thermal inertia matching layer 12 can be constructed by on-site application or by pasting precast panels; the specific materials can be inorganic lightweight aggregate thermal insulation mortar, perlite composite cementitious materials or other materials with similar thermal conductivity, as long as their thermal conductivity is between that of the insulation board and the backing board.

[0041] In addition, the cement backing board 13 and the decorative panel 15 are fixed together by an adhesive layer 14, which can be a polymer cement adhesive or a special exterior wall adhesive.

[0042] Furthermore, the thermally broken connecting component 2 passes sequentially through the cement backing plate 13, the thermal inertia matching layer 12, and the insulation board 11 along the thickness direction of the wall. Its left end is the insertion end 22, and its right end is the locking end 23. A thermal insulation sleeve 25 is fitted in the middle section of the columnar connector 21. The axial length of the thermal insulation sleeve 25 is designed to cover the entire thickness range of the insulation board 11. If necessary, it can be slightly longer than the thickness of the insulation board, so that its two ends extend into the precast wall 1 and the thermal inertia matching layer 12, or at least abut against the two. The purpose of this arrangement is to completely block the heat flow conduction path along the axis of the connector in the area with the greatest thermal resistance, avoiding heat "taking a shortcut".

[0043] The heat-insulating clamping assembly 3 is disposed within the prefabricated locking groove 101. It has a slot 32 that engages with the insertion end 22, and an inclined locking shaft 342 that can move radially relative to the insertion end 22. The insertion end 22 has a locking groove 343 corresponding to the inclined locking shaft 342. The side of the inclined locking shaft 342 facing the insertion end 22 is inclined. During installation, the insertion end 22 is inserted into the prefabricated locking groove 101 through the heat-insulating clamping assembly 3. When the insertion end 22 is inserted into the slot 32, the inclined surface presses against the end of the insertion end 22 and drives the inclined locking shaft 342 to move radially away. After the insertion end 22 is fully inserted, the inclined locking shaft 342 is automatically attracted into the locking groove 343 by its built-in magnet, and at the same time, a perceptible "click" sound is emitted, achieving axial locking. At this time, temporary fixation can be achieved without the need for the locking fastener 24.

[0044] Then, the insulation board 11, the thermal inertia matching layer 12, and the cement backing board 13 are sequentially fitted onto the columnar connector 21. Finally, the locking fastener 24 is installed on the locking end 23 and tightened to press and fix the cement backing board 13. The locking fastener 24 is a nut, and the locking end 23 has an external thread that mates with it. After tightening, the nut is embedded in the reserved groove on the back of the decorative panel 15, and the nut protrusion is not visible from the outdoor side, which not only ensures a flat appearance but also provides operating space for subsequent maintenance. Gaskets can be placed between the locking fastener 24 and the cement backing board 13 as needed to prevent local crushing and further reduce thermal bridging.

[0045] Specifically, the cylindrical connector 21, as the core load-bearing component of the thermally broken connection assembly 2, can be made into a cylindrical structure using low thermal conductivity composite materials such as glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic, or polyetheretherketone (PEEK). These materials have thermal conductivity far lower than steel, effectively blocking heat conduction along the connector's axial direction. Simultaneously, their tensile and shear strengths meet the mechanical requirements of the external wall insulation system. In specific engineering construction, materials can be rationally selected from the above sources, or other low thermal conductivity, high-strength materials with similar properties, can be used, depending on the load requirements and cost considerations of the specific project. For example, GFRP's thermal conductivity can be controlled within a low range, and it has good corrosion resistance and a thermal expansion coefficient close to that of concrete, making it less prone to interface cracking due to temperature changes.

[0046] The thermal insulation sleeve 25 can be made of insulation materials such as nano-aerogel felt, modified polyurethane foam, phenolic foam, or extruded polystyrene board. Among them, nano-aerogel felt has an extremely low thermal conductivity, but its cost is relatively high; modified polyurethane foam has good mechanical properties and cost-effectiveness, and is suitable for general engineering projects. In actual construction, the choice can be made by the personnel themselves. In the specific assembly, the thermal insulation sleeve 25 and the cylindrical connector 21 can be assembled by interference fit or adhesive bonding to ensure that there is no relative slippage between the two during use. The wall thickness of the insulation sleeve 25 should be determined based on the diameter of the connector and the stress requirements, and is generally controlled within a reasonable range to ensure sufficient compressive strength. For example, "taking a cylindrical connector 21 with a diameter of 12mm and a 100mm thick insulation board 11 as an example, the outer diameter of the insulation sleeve 25 is 22mm and the wall thickness is 5mm. This wall thickness comprehensively considers the diameter of the cylindrical connector 21, the compressive strength of the sleeve material, the preload generated by tightening the nut, and the self-weight load of each structural layer to ensure that the sleeve is not crushed. If the diameter of the connector increases to 20mm or the thickness of the insulation board increases to 150mm, the wall thickness should be increased accordingly to 8-10mm; if the load is small, it can be reduced to 3-4mm." The values ​​are only examples, and those skilled in the art can calculate and determine them based on actual parameters.

[0047] The working principle of this embodiment is as follows:

[0048] The thermal break connection component 2 anchors the outer structural layers to the precast wall 1, providing a mechanical connection; the thermal insulation sleeve 25 isolates the columnar connector 21 from the surrounding environment within the insulation board 11, cutting off the heat flow path; the thermal inertia matching layer 12 acts as a transition between the insulation board and the cement backing board, which have significantly different thermal conductivity, reducing the interface temperature gradient; the thermal insulation clamping component 3 achieves axial locking through inclined guidance and magnetic adsorption, providing reliable positioning feedback, and tightens further after locking, effectively preventing loosening of the connection caused by long-term vibration or insulation board creep. These four components work together to minimize the thermal bridging effect at the joints while ensuring connection strength and durability. (Refer to...) Figure 3 As shown in the heat flow direction, when heat from the indoor side is conducted outward, it passes sequentially through the precast wall 1, insulation board 11, thermal inertia matching layer 12, cement backing board 13, and decorative panel 15. Due to the blocking effect of the heat insulation sleeve 25, heat is difficult to escape along the axial direction of the column connector 21, thus achieving a thermal bridge-free effect. Meanwhile, in comparison... Figure 7 As can be seen from the curve trend, without the thermal inertia matching layer 12, heat will directly enter the high thermal conductivity cement backing plate 13 from the low thermal conductivity insulation board 11, resulting in a large temperature gradient at the interface and easy generation of thermal stress. However, after adding the thermal inertia matching layer 12, the thermal conductivity increases stepwise, the heat flow is smoother, and the stability of the node is further guaranteed in long-term use.

[0049] Example 2

[0050] like Figure 4 and Figure 5 As shown, this embodiment provides a further detailed implementation of the internal structure of the heat insulation clamping component 3 based on embodiment one.

[0051] The thermal insulation clamping assembly 3 also includes a thermal insulation jacket 31. A slot 32 is provided at the end of the thermal insulation jacket 31 facing the insertion end 22. The outer peripheral surface of the thermal insulation jacket 31 has at least one annular groove 311, which is filled with a thermal insulation medium (such as nano-aerogel paste or low thermal conductivity foam) to further block the conduction of heat from the prefabricated locking groove 101 to the prefabricated wall 1 during prefabrication and assembly, while reducing contact thermal resistance. The inner peripheral surface of the thermal insulation jacket 31 has a plurality of limiting optical axes 33 (e.g., 3 to 6) evenly distributed circumferentially. A limiting plate 34 is slidably disposed on each limiting optical axis 33, and an inclined locking shaft 342 is fixedly disposed on the side of the limiting plate 34 facing the slot 32. An inclined block 341 is also fixedly disposed on the side of the limiting plate 34 away from the insertion end 22.

[0052] A heat-insulating piston disc 35 is slidably disposed within the cavity of the slot 32 on the side away from the insertion end 22. The heat-insulating piston disc 35 is connected to the inner wall of the cavity of the slot 32 by a return spring 352. A ball head protrusion 351 is fixedly disposed on the side of the heat-insulating piston disc 35 facing the inclined block 341, and the ball head protrusion 351 abuts against the corresponding inclined block 341.

[0053] The cavity space of the heat-insulating piston disc 35 on the side away from the insertion end 22 is filled with a thermal expansion medium (such as paraffin-based or silicone oil-based thermal expansion material), and the end face of the heat-insulating jacket 31 on the side away from the insertion end 22 is coated with a carbon nanotube coating.

[0054] During installation, the plug end 22 is inserted into the slot 32, and the inclined locking shaft 342 is pushed open. The magnetic adsorption locking process is the same as in Embodiment 1. When the external wall temperature rises, the carbon nanotube coating absorbs solar radiation heat and quickly conducts it to the thermal expansion medium. The expansion of the medium pushes the heat-insulating piston disc 35 towards the plug end 22, and the ball head protrusion 351 presses against the inclined block 341. This, in turn, applies additional radial pressure to the inclined locking shaft 342 through the limiting plate 34, making the locking more reliable. When the temperature drops, the return spring 352 pushes the heat-insulating piston disc 35 back to its original position to avoid over-tightening. This temperature adaptive compensation mechanism can effectively offset the gap caused by the thermal expansion and contraction of the connectors due to seasonal temperature differences or diurnal temperature differences, and requires no manual maintenance for long-term use.

[0055] The installation method in this embodiment is basically the same as that in embodiment one. The only difference is that after the plug-in end 22 is inserted into place, the heat insulation clamping component 3 can not only provide magnetic locking and positioning feedback, but also automatically adjust the locking force according to temperature changes during use.

[0056] Example 3

[0057] This embodiment provides several alternative implementations of the aforementioned embodiments, applicable to different engineering scenarios.

[0058] Regarding the installation method of the thermal insulation sleeve 25: The thermal insulation sleeve 25 and the cylindrical connector 21 can be installed by interference fit press-fit, or a small amount of structural adhesive can be applied to the mating surfaces to enhance the fixation. If an interference fit is used, the inner diameter of the sleeve should be slightly smaller than the outer diameter of the connector, and assembly should be carried out by axial pressing. If adhesive bonding is used, a type of adhesive with good weather resistance and high temperature resistance should be selected. Both methods have their advantages and disadvantages: interference fit is a purely mechanical fixation that does not rely on the aging performance of the adhesive, but requires press-fitting equipment; adhesive bonding has lower requirements for processing precision, but the long-term durability of the adhesive must be considered. Users can choose according to their actual production conditions.

[0059] Regarding the pre-installation method of the precast locking groove 101: The precast locking groove 101 can be directly embedded into the mold during the pouring of the precast wall 1, or it can be installed by post-installation after the wall has cured. For cast-in-place concrete walls, the pre-embedding method is recommended because the positioning is more accurate and the anchoring is more reliable; for the renovation of existing buildings, only the post-installation method can be used. Both methods can achieve the technical effect of this application; the difference lies only in the construction sequence and process details. The scope of protection of this application should not be limited to the pre-embedding / pre-installation method only.

[0060] Regarding the sealing structure: A sealing structure should be provided between the through holes in the insulation board 11, the thermal inertia matching layer 12, and the cement backing board 13 and the columnar connector 21 or the insulation sleeve 25. The main function of the sealing structure is to prevent air infiltration and rainwater leakage, while also reducing convective heat loss at the gaps. The specific sealing method used depends on the construction precision and cost requirements: elastic sealing rings are suitable for factory-prefabricated panels and have a fast installation speed; foam sealing strips or foam adhesives are suitable for on-site construction and have good adaptability. Those skilled in the art can make a reasonable selection based on the actual situation.

[0061] Regarding the selection of gaskets: For the gasket between the fastener 24 and the cement backing plate 13, if a flat gasket is used, it is recommended to add an additional thermal insulation gasket between the flat gasket and the cement backing plate; if a thermal insulation gasket is used directly, the flat gasket can be omitted. The purpose is that metal gaskets conduct heat relatively quickly, and direct contact with the cement backing plate will create a localized thermal bridge. Although the thermal bridge is small, it is still necessary to eliminate it in near-zero energy buildings. Adding an insulation gasket further blocks the heat flow path, resulting in better overall performance.

[0062] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A structure for a building exterior wall without thermal bridge connection nodes, comprising a precast wall (1), wherein the outer side of the precast wall (1) is the interior side and the inner side of the precast wall (1) is the exterior side, characterized in that, Also includes: Insulation board (11) is installed on the inner side of the precast wall (1); A thermal inert matching layer (12) is disposed on the inner side of the insulation board (11); A cement backing board (13) is disposed on the inner side of the thermal inertia matching layer (12), and the thermal conductivity of the thermal inertia matching layer (12) is between the thermal conductivity of the insulation board (11) and the thermal conductivity of the cement backing board (13). Decorative panel (15) is disposed on the inner side of the cement backing plate (13); The thermal break connection assembly (2) passes through the cement backing plate (13), the thermal inert matching layer (12) and the insulation board (11) in sequence, and forms a connection with the precast wall (1); The thermal break connection assembly (2) includes a columnar connector (21), the outer end of the columnar connector (21) is provided with a plug-in end (22), the inner end is provided with a locking end (23), the plug-in end (22) is inserted into a prefabricated locking groove (101) preset in the prefabricated wall (1) through the thermal insulation clamping assembly (3), and a locking device (24) is installed on the locking end (23). Furthermore, the middle section of the cylindrical connector (21) is fitted with a heat insulation sleeve (25), and the heat insulation sleeve (25) covers at least the thickness range of the insulation board (11); The heat-insulating clamping assembly (3) is disposed in the prefabricated locking groove (101), and has a slot (32) that is engaged with the plug-in end (22), and a sloping locking shaft (342) that can move radially relative to the plug-in end (22); the plug-in end (22) is provided with a locking groove (343) corresponding to the sloping locking shaft (342); the side of the sloping locking shaft (342) facing the plug-in end (22) is sloping. When the plug-in end (22) is inserted into the slot (32), the sloping side of the sloping locking shaft (342) abuts against the end of the plug-in end (22) and drives the sloping locking shaft (342) to move radially away. After the plug-in end (22) is inserted into the slot (32), the sloping locking shaft (342) is automatically attracted into the locking groove (343) by magnetic force to achieve axial locking.

2. The structure of the building exterior wall without thermal bridge connection node according to claim 1, characterized in that, The heat insulation clamping assembly (3) also includes a heat insulation jacket (31), and the slot (32) is provided at one end of the heat insulation jacket (31) facing the insertion end (22); the outer peripheral surface of the heat insulation jacket (31) is provided with at least one annular groove (311), and the annular groove (311) is filled with a heat insulation medium. The inner circumferential surface of the heat insulation jacket (31) is provided with a plurality of limiting optical axes (33) distributed in the circumferential direction. A limiting plate (34) is slidably disposed on each limiting optical axis (33). The inclined locking shaft (342) is fixedly disposed on the side of the limiting plate (34) facing the slot (32).

3. The structure of the building exterior wall without thermal bridge connection node according to claim 2, characterized in that, A ramp block (341) is fixedly provided on the side of the limiting plate (34) away from the plug end (22); a heat-insulating piston disc (35) is slidably provided on the side of the cavity of the slot (32) away from the plug end (22), and the heat-insulating piston disc (35) is connected to the inner wall of the cavity of the slot (32) by a return spring (352); a ball head protrusion (351) is fixedly provided on the side of the heat-insulating piston disc (35) facing the ramp block (341), and the ball head protrusion (351) abuts against the corresponding ramp block (341).

4. The structure of the building exterior wall without thermal bridge connection node according to claim 3, characterized in that, The cavity space of the heat-insulating piston disc (35) on the side away from the plug end (22) is filled with a thermal expansion medium, and the end face of the heat-insulating jacket (31) on the side away from the plug end (22) is coated with a carbon nanotube coating.

5. The structure of the building exterior wall without thermal bridge connection node according to claim 1, characterized in that, The locking end (23) is provided with an external thread, and the locking part (24) is a nut. The nut cooperates with the external thread and presses the cement backing plate (13). The nut is embedded in the reserved groove on the back of the decorative panel (15).

6. The structure of the building exterior wall without thermal bridge connection node according to claim 5, characterized in that, A gasket is also provided between the locking fastener (24) and the cement backing plate (13), and the gasket is a flat gasket or a heat insulation gasket.

7. The structure of the building exterior wall without thermal bridge connection node according to claim 1, characterized in that, The axial length of the heat insulation sleeve (25) is greater than or equal to the thickness of the insulation board (11), and both ends of the heat insulation sleeve (25) extend into the precast wall (1) and the thermal inertia matching layer (12) or abut against the precast wall (1) and the thermal inertia matching layer (12).

8. The structure of the building exterior wall without thermal bridge connection node according to claim 1, characterized in that, An adhesive layer (14) is provided between the cement backing board (13) and the decorative panel (15).

9. An installation method for a thermal bridge-free connection node structure for building exterior walls, applied to the thermal bridge-free connection node structure for building exterior walls as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1: During the casting or fabrication of the precast wall (1), the precast locking groove (101) is preset in a predetermined position, and the heat insulation clamping component (3) is precast and assembled in the precast locking groove (101); S2: Insert the plug end (22) of the thermal break connection assembly (2) into the prefabricated locking groove (101) through the thermal insulation clamping assembly (3), so that the plug end (22) and the slot (32) are engaged. At the same time, the inclined surface of the inclined locking shaft (342) presses against the end of the plug end (22) and slides outward. After the plug end (22) is inserted into place, the inclined locking shaft (342) is automatically attracted into the locking groove (343) by magnetic force to achieve locking. S3: The insulation board (11), the thermal inert matching layer (12), and the cement backing board (13) are sequentially placed on the thermal break connection assembly (2), and the heat insulation sleeve (25) is located within the thickness range of the insulation board (11). S4: Install the locking fastener (24) on the locking end (23) and apply pre-tightening force to press the cement backing plate (13) tightly; S5: Fix the decorative panel (15) to the inside of the cement backing board (13) by means of an adhesive layer (14).

10. The installation method according to claim 9, characterized in that, In step S2, when the plug-in end (22) is plugged in, the inclined locking shaft (342) is attracted into the locking groove (343) and a perceptible sound of being in place is generated.

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