A hollow composite sandwich insulated wall panel and beam connection device and construction method

Abstract

This invention relates to the field of building structural engineering technology, and discloses a hollow composite sandwich insulated wall panel and beam connection device and construction method, applicable to engineering scenarios such as high-rise residential buildings and public buildings using prefabricated component assembly. This invention addresses the problems in existing technologies, such as difficulty in coordinating structural connection reliability and thermal continuity, strong reliance on wet operations, low assembly efficiency, and poor adaptability to the main structural system. The device includes a lower anchoring component pre-embedded in the inner leaf panel of the wall panel, an upper anchoring component on the top of the beam, a vertical force transmission connector, a horizontal limiting adjustment mechanism, and a composite sealing system. It achieves dry and efficient installation by physically isolating the force and heat flow transmission paths. This invention effectively blocks structural thermal bridges, improves assembly accuracy and construction efficiency, and is applicable to various main structural systems.

Description

Technical Field

[0001] This invention relates to the field of building structure engineering technology, specifically to a hollow composite sandwich insulated wall panel and beam connection device and construction method. Background Technology

[0002] Hollow composite sandwich insulated wall panels, as high-performance prefabricated components integrating enclosure, insulation, and decoration functions, are widely used in the external envelope systems of high-rise residential buildings, public buildings, and low-energy buildings due to their excellent thermal performance, lightweight and high-strength characteristics, and standardized factory production. These wall panels typically consist of two layers of concrete panels, a middle insulation layer, and tie rods connecting the inner and outer panels, forming a "sandwich" composite structure that effectively improves construction efficiency while meeting building energy efficiency standards. When these wall panels need to be reliably connected to beams in the main structure, their joint construction and manufacturing processes face multiple technical challenges, especially in achieving the synergistic optimization of structural safety, thermal continuity, and ease of assembly.

[0003] The invention patent CN114412195B discloses an AAC composite wall panel assembly method. This method involves setting a hoisting positioning groove at the bottom of the wall panel and configuring a matching limiting structure at the top water-stop curb of the beam. High-strength mortar is then injected after drilling holes in the top to achieve vertical anchoring and horizontal positioning between the wall and beam. This solution addresses the precision control issue of on-site installation of precast wall panels to some extent and enables synchronous construction with the main structure. However, this method still relies on on-site wet work to complete the final force transfer, significantly increasing the construction process and curing cycle. It also places extremely high demands on the fluidity and density of the grout and the alignment accuracy of the reinforcing bars. Common construction deviations such as incomplete grouting, trapped air bubbles, or misalignment of embedded reinforcing bars directly weaken the shear and pull-out bearing capacity of the joints, thus affecting the seismic performance and long-term durability of the overall structure. The connection area, where metal connectors or concrete directly penetrate the inner and outer leaf plates and the beam, forms a clear heat conduction path, known as a structural thermal bridge. This severely disrupts the thermal continuity of the sandwich insulation layer, resulting in the actual heat transfer coefficient of the building envelope system being much higher than the design value. This makes it difficult to meet the stringent requirements of near-zero energy buildings for thermal bridge-free structures.

[0004] The invention patent CN107882184B proposes a prefabricated exterior wall that simplifies the connection structure by embedding insulation material inside the cross-section of a composite beam, allowing the upper and lower wall panels to directly clamp the beam. While this avoids the thermal bridging risk associated with exposed connectors, placing non-structural insulation material in the core load-bearing area of ​​the beam effectively compresses the effective concrete cross-section, weakening the beam's bending and shear resistance. This violates the fundamental seismic design principles of strong column-weak beam and strong shear-weak bending in structural components. Furthermore, the structure relies entirely on post-cast concrete to achieve the integrity of the wall-beam interface, lacking an independent and reliable mechanical connection mechanism. Under seismic loads or strong winds, this can easily lead to relative slippage or even cracking due to interface bonding failure, endangering structural safety and damaging the building's airtight layer, causing secondary problems such as condensation and increased energy consumption.

[0005] Furthermore, various external wall panel connection schemes have emerged in the existing technology, but none of them fundamentally solve the problem of synergy between structural connection and thermal performance. For example, the external wall panel connection node structure disclosed in utility model patent CN210369420U achieves wall panel installation through horizontal adjustment connectors, limit key components, and shear keys. Although it has a certain adjustment capability, the metal connectors directly penetrate the indoor and outdoor environments, forming significant structural thermal bridges, and it relies on cast-in-place concrete for final fixation, making purely dry operation impossible. The external wall panel connection system proposed in invention patent CN111945935B uses rotary sliding nodes and translational sliding nodes to achieve three-dimensional adjustment, but the connector system is complex, the metal components are directly exposed in the heat transfer path, the thermal bridging effect is obvious, and there is a lack of effective thermal blocking mechanisms. Although the invention patent with announcement number CN114197698B attempts to solve the thermal bridging problem through a cable connection structure, using pre-embedded cables inside the wall panel to connect with the beam support, the force path of the cable system is unclear, the pre-tension control is complicated, and it cannot achieve precise fine-tuning during the installation process, thus limiting its construction adaptability.

[0006] Existing connection technologies for hollow composite insulated wall panels and beams, regardless of whether post-grouting anchoring or in-situ insulation clamping is employed, all face a deep-seated technical challenge: prioritizing structural connection reliability necessitates the introduction of metal connectors or cast-in-place concrete, sacrificing thermal performance and increasing wet work; conversely, emphasizing insulation continuity and dry construction often comes at the cost of weakened structural effectiveness or compromised joint stiffness. Traditional connection structures fail to achieve decoupling of force transmission and heat flow interruption in both physical space and functional logic, resulting in a trade-off between structural performance and energy efficiency. Summary of the Invention

[0007] This invention discloses a hollow composite sandwich insulated wall panel and beam connection device and construction method, which solves the fundamental technical problem that structural reliability and thermal continuity are difficult to coordinate due to path coupling when connecting wall panels and beams in prefabricated buildings.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] A hollow composite sandwich insulated wall panel and beam connection device is disclosed. The hollow composite sandwich insulated wall panel consists of an inner leaf panel, an outer leaf panel, a middle core insulation layer, and several tie members. The inner leaf panel and the outer leaf panel are mechanically connected by tie members, and the core insulation layer fills the space between the two panels and completely covers the tie members. The beam is any one of cast-in-place concrete beam, precast concrete beam, or steel beam, and its top is provided with a support surface for supporting the bottom of the wall panel. The connection device of the present invention includes: a lower anchoring component embedded in the inner leaf panel at the bottom of the wall panel; an upper anchoring component embedded in the support surface at the top of the beam; a vertical force transmission connector connecting the lower anchoring component and the upper anchoring component; a horizontal limiting adjustment mechanism disposed between the outer leaf panel at the bottom of the wall panel and the side wall of the beam; and a composite sealing system covering the junction area between the bottom of the wall panel and the beam.

[0010] Furthermore, the lower anchoring assembly consists of a U-shaped anchoring groove made of high-strength alloy steel, a sliding adjusting block embedded inside the U-shaped anchoring groove, a threaded sleeve fixed to the bottom surface of the sliding adjusting block, and an adjusting screw that penetrates the inner leaf panel and is threadedly engaged with the threaded sleeve. The U-shaped anchoring groove is arranged at intervals along the length of the wall panel, with its opening facing downwards. The two flanges are welded and fixed to the reinforcing steel mesh in the inner leaf panel by pre-embedded steel bars. The sliding adjusting block can slide in the U-shaped anchoring groove in a direction perpendicular to the plane of the wall panel. It has an internal threaded hole at the center of its bottom surface for engaging with the adjusting screw. The upper end of the adjusting screw passes through a pre-reserved through hole at the bottom of the inner leaf panel and is fixed to the inner side of the inner leaf panel by a locking nut. The lower end extends into the U-shaped anchoring groove and is threadedly connected to the sliding adjusting block. By rotating the adjusting screw, the vertical position of the sliding adjusting block in the U-shaped anchoring groove can be precisely controlled, thereby achieving fine adjustment of the wall panel installation height.

[0011] Furthermore, the upper anchoring assembly consists of an anchoring steel plate pre-embedded in the top support surface of the beam, multiple positioning pins welded to the upper surface of the anchoring steel plate, and an elastic buffer pad layer covering the anchoring steel plate. The anchoring steel plate is made of Q345B grade low alloy high-strength structural steel with a thickness of not less than 12mm, and its planar dimensions match the projected outline of the U-shaped anchoring groove. The positioning pins are cylindrical stainless steel pins with a diameter of 22mm and a height of 30mm, distributed in a rectangular array along the upper surface of the anchoring steel plate, and the row direction of the array is parallel to the length direction of the beam, with a center distance of 60mm between adjacent pins. The elastic buffer pad layer is made of ethylene propylene diene monomer (EPDM) rubber with a Shore hardness of 60±5A and a thickness of 5mm. Its upper surface has through holes corresponding to the positions of the positioning pins, allowing the top of the positioning pins to penetrate the elastic buffer pad layer and protrude 5mm.

[0012] Furthermore, the vertical force transmission connector is a high-strength alloy steel stepped bushing structure, including an upper large-diameter section, a middle transition tapered section, and a lower small-diameter section; the upper large-diameter section has an outer diameter of 40mm and a length of 50mm, and its outer circumference is provided with external threads for engaging with the threaded sleeve on the bottom surface of the sliding adjustment block; the lower small-diameter section has an outer diameter of 25mm and a length of 80mm, and its end is provided with a chamfer; the middle transition tapered section connects the upper large-diameter section and the lower small-diameter section, and the tapered angle is 15° ... middle transition tapered section connects the upper large-diameter section and the lower small-diameter section, and the middle transition tapered section connects the upper large-diameter section and the lower small-diameter section, and the middle transition tapered section connects the upper large-diameter section and the lower small-diameter section, and the middle transition tapered section connects the upper large-diameter section and the lower small-diameter section, and the middle transition tapered section connects the upper large-diameter section and the lower small-diameter section. The circumferential surface is fitted with a low thermal conductivity shear-resistant bushing made of polyetheretherketone (PEEK), with a wall thickness of 3.5 mm, an outer diameter of 38 mm, a length of 70 mm, and a thermal conductivity not exceeding 0.4 W / (m·K). During installation, the lower small-diameter section of the vertical force transmission connector is inserted into the gap between two adjacent positioning pins in the anchoring assembly at the top of the beam. The low thermal conductivity shear-resistant bushing then forms a double-sided pressing contact with the sides of the two adjacent positioning pins. The vertical force transmission connector transmits horizontal shear force through this bushing, and the designed shear force does not exceed 15 kN.

[0013] Furthermore, the horizontal limiting adjustment mechanism includes an L-shaped limiting bracket fixed to the inner side of the outer leaf panel at the bottom of the wall panel, a fine-adjusting screw installed on the horizontal section of the L-shaped limiting bracket, and a high-density polyethylene (HDPE) buffer strip pasted to the corresponding position on the beam sidewall. The L-shaped limiting bracket is formed by bending a 6mm thick hot-dip galvanized steel plate, and its vertical section is connected to a pre-embedded steel plate on the inner side of the outer leaf panel by chemical anchors. The fine-adjusting screw is an M12×1.75 fine thread screw, with a freely rotatable hemispherical cap or a hard alloy washer at its front end, which abuts against the surface of the HDPE buffer strip. The HDPE buffer strip has a density of not less than 950kg / m³, a thickness of 10mm, and a width of 50mm. It is pasted to the beam sidewall with weather-resistant silicone structural adhesive, and its surface flatness deviation does not exceed 1mm / m. By rotating the fine-adjusting screw, the wall panel can be pushed to perform millimeter-level position correction in the horizontal plane, ensuring that the alignment accuracy between the wall panel and the beam is controlled within ±2mm.

[0014] Furthermore, the composite sealing system is composed of three functional materials, from the inside out: an inner airtight membrane layer, a middle thermal insulation filling layer, and an outer waterproof and breathable membrane layer; the inner airtight membrane layer is an aluminum foil composite polyethylene film with a thickness of 0.2 mm, and its inner surface is coated with butyl rubber pressure-sensitive adhesive, which is directly pasted to the gap between the bottom edge of the inner leaf panel and the top surface of the beam; the middle thermal insulation filling layer uses on-site foamed closed-cell phenolic foam with a thermal conductivity of no more than 0.022 W / ( The material, with a density of 45 kg / m³, is filled in the cavity between the inner airtight membrane layer and the outer waterproof and breathable membrane layer, completely covering the exposed parts of the vertical force transmission connector and the horizontal limit adjustment mechanism. The outer waterproof and breathable membrane layer is a polytetrafluoroethylene (PTFE) microporous membrane composite nonwoven fabric with a water vapor permeability of not less than 1500 g / (m²·24h) and a hydrostatic pressure resistance of not less than 20 kPa. It is mechanically fixed to the junction of the bottom edge of the outer leaf panel and the beam side wall by stainless steel pressure strips.

[0015] In addition, this invention also discloses a construction method for a hollow composite sandwich insulation wall panel and beam connection device, including the following steps:

[0016] The first step is to pre-embed the lower anchoring components at the designated position at the bottom of the inner leaf panel when prefabricating the hollow composite sandwich insulation wall panel in the factory, and install the L-shaped limiting bracket on the inner side of the outer leaf panel. At the same time, a clean bonding surface for installing the inner airtight membrane layer is reserved at the bottom edge of the wall panel.

[0017] The second step, during the beam component fabrication stage, involves pre-embedding the upper anchoring assembly entirely within the top support surface of the beam, ensuring that the upper surface of the anchoring steel plate is flush with the top surface of the beam, the positioning pins are vertically upward, and the elastic buffer pad completely covers the anchoring steel plate; if the beam is a steel structure, a ribbed stiffening plate is welded to the top of the steel beam as an anchoring base, and then the anchoring steel plate and positioning pins are installed on it.

[0018] The third step is to hoist the wall panel on site, align the bottom of the wall panel with the top support surface of the beam and slowly lower it, so that the lower small diameter section of the vertical force transmission connector enters the gap between the adjacent positioning pins, and at the same time, the L-shaped limiting bracket is close to the side wall of the beam.

[0019] The fourth step is to adjust the vertical position of the sliding adjustment block in the U-shaped anchoring groove by rotating the adjusting screw, so that the design gap between the bottom of the wall panel and the top surface of the beam is controlled within the range of 15±2mm.

[0020] Fifth step: Use the fine-tuning screws to push the wall panel for horizontal fine-tuning until the wall panel axis is aligned with the beam axis. Use a total station to measure the deviation, which should not exceed ±2mm.

[0021] Step 6: Apply the inner airtight membrane layer to the inner gap at the junction of the wall panel and the beam, ensuring that it completely covers the joint and extends 50mm to each side.

[0022] Step 7: Inject liquid two-component phenolic resin foaming agent into the joint cavity from the outside, and wait for it to cure to form a central insulation filling layer. The filling density is not less than 95% as detected by infrared thermal imaging.

[0023] Step 8: Install the outer waterproof and breathable membrane layer, and fix it to the outer leaf panel and beam side wall with stainless steel pressure strips using self-tapping screws, with the screw spacing not exceeding 300mm.

[0024] Step 9: Apply an anti-corrosion coating system consisting of epoxy zinc-rich primer and polyurethane topcoat to all exposed metal connection parts, with a total dry film thickness of not less than 120μm.

[0025] Furthermore, the threaded connection between the vertical force transmission connector and the sliding adjustment block is provided with an anti-loosening structure. This structure consists of a nylon insert set on the inner wall of the threaded sleeve and an axial groove on the external thread of the adjusting screw. When the adjusting screw is screwed into the set position, the nylon insert is embedded in the groove to form a mechanical lock, preventing loosening caused by vibration or temperature deformation.

[0026] In a preferred embodiment of the present invention, the inner wall of the U-shaped anchoring groove is coated with a ceramic-based heat-insulating coating with a thickness of 50 μm and a thermal conductivity of less than 1.5 W / (m·K) to further reduce the heat conduction path between the inner blade panel and the vertical force transmission connector.

[0027] Furthermore, the surface of the positioning pin is coated with a micron-level alumina ceramic coating with a thickness of 100μm and a hardness of HV≥1200, which is used to improve wear resistance and corrosion resistance, while reducing the coefficient of friction with the vertical force transmission connector.

[0028] Furthermore, the reinforcing steel mesh in both the inner and outer leaf panels is made of HRB400 grade hot-rolled ribbed steel bars with a diameter of not less than 8mm and a mesh spacing of not more than 200mm; the tie members are three-dimensional truss-type connectors made of glass fiber reinforced composite material (GFRP) with a tensile strength of not less than 600MPa and a thermal conductivity of not more than 0.4W / (m·K), arranged in a quincunx pattern along the wall panel plane with a spacing of not more than 600mm.

[0029] The composite sealing and plugging system not only provides a continuous airtight and watertight barrier, but also ensures that the thermal conductivity of the central insulation filling layer is comparable to that of the sandwich insulation layer, thus ensuring the consistency of thermal performance of the enclosure system in the node area. Tests have shown that nodes using this connection device can significantly reduce the thermal bridge effect, effectively reducing the overall heat transfer coefficient of the wall nodes.

[0030] In the construction method of the hollow composite sandwich insulation wall panel and beam connection device described in this invention, the positional tolerance of all pre-embedded components is controlled within ±3mm, all on-site adjustment operations are completed by special tools without the need for large equipment assistance, the installation time of a single node does not exceed 30 minutes, and the assembly efficiency is improved by more than 60% compared with the traditional wet connection process.

[0031] Furthermore, the top support surface of the beam is provided with a locally thickened structure in the projection area of ​​the corresponding vertical force transmission connector. The thickness of the thickened layer is not less than 50mm and the reinforcement ratio is not less than 0.3%, so as to enhance the local bearing capacity and prevent concrete crushing caused by stress concentration.

[0032] As another preferred embodiment of the present invention, when applied to areas with seismic fortification intensity of 8 degrees or above, an energy-dissipating damping pad is added between the inner leaf panel at the bottom of the wall panel and the top surface of the beam. The energy-dissipating damping pad is made of alternating vulcanization of high-damping rubber and stainless steel sheet, with a thickness of 15mm and a shear modulus of 1.2MPa. It can dissipate energy through hysteretic deformation under rare earthquake action and improve the ductility of the joint.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] This invention uses the vertical force-transmitting connector as the core force-bearing unit, constructing a closed force flow path from the inner leaf panel through the lower anchoring assembly to the upper anchoring assembly. The closed force flow path achieves precise vertical positioning through adjusting screws and sliding adjustment blocks, and clarifies the force distribution through the pressing contact between the positioning pin and the low thermal conductivity shear bushing, ensuring that the nodes transmit only pressure and limited shear force. Simultaneously, the horizontal limit adjustment mechanism, through the elastic interaction between the fine-tuning set screw and the high-density polyethylene buffer strip, effectively releases temperature stress while achieving precise horizontal positioning, forming a stable statically determinate force-bearing system.

[0035] This invention significantly weakens structural thermal bridges through multiple blocking mechanisms. Vertical force-transmitting connectors and positioning pins achieve indirect contact and shear force transfer via low-thermal-conductivity shear-resistant bushings. A thermal insulation coating is installed within the U-shaped anchoring groove, physically cutting off the continuous heat conduction path of the metal components. Simultaneously, the composite sealing system, through the synergistic effect of the inner airtight membrane layer, the middle thermal insulation filling layer, and the outer waterproof and breathable membrane layer, reconstructs a complete thermal insulation and airtight barrier in the node area. The thermal resistance performance remains consistent with the sandwich insulation layer, fundamentally ensuring the thermal integrity of the building envelope system.

[0036] This invention enables factory prefabrication and modular installation of all components. The pre-embedded design of the lower and upper anchoring components, along with the three-dimensional adjustment capability of the adjusting screws and fine-tuning jacks, completely eliminates the reliance on wet work during on-site installation, significantly improving construction accuracy and efficiency. The modular architecture can adapt to various main structural systems, including cast-in-place concrete beams, precast concrete beams, and steel beams, demonstrating good engineering adaptability.

[0037] This invention achieves durable synergy among various functional units through material performance optimization and structural layer matching. The energy dissipation capacity of the elastic buffer layer, the protective effectiveness of the anti-corrosion coating system, and the anti-loosening design of the mechanical locking structure jointly ensure the performance stability and maintenance convenience of the connection nodes during long-term use.

[0038] In summary, this invention achieves decoupling of force flow and heat flow paths, ensuring the structural safety and deformation coordination of wall and beam joints under normal use and extreme loads, completely eliminating the thermal bridge effect, and significantly reducing on-site wet work, thereby improving assembly accuracy and construction efficiency. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is an overall flowchart of the construction method described in this invention.

[0041] Figure 2 This is a simplified diagram showing the connection relationship between the hollow composite sandwich insulation wall panel and the beam connection device described in this invention.

[0042] Figure label:

[0043] 101-Vertical force transmission connector, 102-Upper anchoring assembly, 103-Lower anchoring assembly, 104-Composite sealing and plugging system, 105-Horizontal limit adjustment mechanism, 106-Beam top support surface, 107-Inner leaf panel, 108-Tie-up component, 109-Sandwich insulation layer, 110-Outer leaf panel. Detailed Implementation

[0044] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0045] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0046] Example 1: See Figure 1 and Figure 2 This embodiment discloses a hollow composite sandwich insulation wall panel and beam connection device. The hollow composite sandwich insulation wall panel is composed of an inner leaf panel 107, an outer leaf panel 110, an intermediate core insulation layer 109, and several tie members 108.

[0047] Both the inner and outer leaf panels are precast fine aggregate concrete slabs with a strength grade of C40 or above, and thicknesses of 120mm and 80mm respectively. The two layers of panels are mechanically connected by three-dimensional truss-type glass fiber reinforced composite (GFRP) tie members 108. The tie members 108 are arranged in a quincunx pattern along the wall panel plane with a spacing of 500mm×500mm. Their measured tensile strength is 620MPa and their thermal conductivity is 0.35W / (m·K).

[0048] The intermediate sandwich insulation layer 109 is made of molded polystyrene foam board (EPS) with a density of 22kg / m³ and a thermal conductivity of 0.033W / (m·K). It completely wraps all the tie members 108 and fills the cavity between the two panels to form a continuous and uninterrupted insulation barrier.

[0049] Both the inner and outer leaf panels are equipped with HRB400 grade hot-rolled ribbed steel mesh, with a steel diameter of 10mm, a mesh spacing of 150mm×150mm, and a steel protective layer thickness of not less than 15mm.

[0050] The beam can be any one of cast-in-place concrete beam, precast concrete beam or steel beam, and the top of the beam is provided with a support surface for receiving the bottom of the wall panel.

[0051] When the beam is a cast-in-place or precast concrete structure, the dimensions of the supporting surface are determined according to the wall panel load and span. The typical cross-section width is 300mm and the height is 600mm. When the beam is a steel beam, the width of its top flange is not less than 250mm, and ribbed stiffening plates are welded to the upper surface of the flange to form an anchoring base. The stiffening plate thickness is 10mm, the rib height is 30mm, and the spacing is 200mm.

[0052] Furthermore, the connecting device includes a lower anchoring component 103 embedded in the inner leaf panel at the bottom of the wall panel, an upper anchoring component 102 embedded in the top support surface 106 of the beam, a vertical force transmission connector 101 connecting the lower anchoring component 103 and the upper anchoring component 102, a horizontal limiting adjustment mechanism 105 disposed between the outer leaf panel at the bottom of the wall panel and the side wall of the beam, and a composite sealing and plugging system 104 covering the area where the bottom of the wall panel intersects with the beam.

[0053] The lower anchoring assembly 103 consists of a U-shaped anchoring groove made of high-strength alloy steel, a sliding adjustment block embedded inside the U-shaped anchoring groove, a threaded sleeve fixed to the bottom surface of the sliding adjustment block, and an adjusting screw that penetrates the inner leaf panel and is threadedly engaged with the threaded sleeve.

[0054] The U-shaped anchoring groove is forged from 42CrMo alloy steel, with a cross-sectional dimension of 60mm high, 80mm wide, and 10mm flange thickness. The internal cavity dimensions are 100mm long, 60mm wide, and 50mm high to accommodate the sliding adjustment block and allow it to slide. A set is arranged every 1200mm along the length of the wall panel, with its opening facing downwards. The two flanges are fixed to the reinforcing steel mesh in the inner leaf panel by pre-embedded steel bars with a diameter of 12mm, and the weld height is not less than 6mm. The inner wall of the U-shaped anchoring groove is coated with a ceramic-based thermal insulation coating with a thickness of 50μm. The ceramic-based thermal insulation coating is composed of a zirconium oxide-yttrium oxide stabilized system, and the measured thermal conductivity is 1.2W / (m·K).

[0055] The sliding adjustment block is a rectangular block made of 35CrMo material, with dimensions of 70mm in length, 50mm in width, and 40mm in height. It can slide within the U-shaped anchor groove in a direction perpendicular to the plane of the wall panel, with a sliding stroke of ±15mm. The bottom center of the sliding adjustment block has an M30×2 internal threaded hole for engaging with the adjusting screw.

[0056] The adjusting screw is made of 35CrMo heat-treated material, with a diameter of 30mm and a pitch of 2.0mm. The upper end passes through the Φ32mm through hole reserved at the bottom of the inner leaf panel and is fixed to the inner side of the inner leaf panel by a double locking nut (M30, grade 8.8). The lower end extends into the U-shaped anchoring groove and is threadedly connected to the sliding adjusting block. The adjusting screw has an annular groove (or radial locking hole) on its shaft. The threaded sleeve has an elastic locking pin on its side wall. When the adjusting screw is screwed into the set position, the annular groove (or radial locking hole) moves to correspond with the elastic locking pin. Under the action of elastic force, the locking pin is embedded in it to form a mechanical locking structure to prevent loosening caused by vibration or temperature deformation.

[0057] The upper anchoring assembly 102 consists of an anchoring steel plate pre-embedded in the top support surface 106 of the beam, a plurality of positioning pins welded to the upper surface of the anchoring steel plate, and an elastic buffer pad layer covering the anchoring steel plate.

[0058] The anchoring steel plate is made of Q345B grade low alloy high-strength structural steel with a thickness of 14mm and a plane size of 100mm×100mm. The upper surface is flush with the top surface of the beam, and the error is controlled within ±1mm. The positioning pins are 304 stainless steel cylindrical pins with a diameter of 22mm and a height of 30mm. They are distributed in a 2×2 rectangular array along the upper surface of the anchoring steel plate, with a center distance of 60mm between adjacent pins. The welding adopts full penetration fillet welds with a weld leg size of not less than 8mm. The surface of the positioning pins is treated with micron-level alumina ceramic spraying, with a coating thickness of 100μm, a microhardness of HV=1250, and a friction coefficient (against steel) reduced to below 0.15.

[0059] The elastic buffer pad is molded from ethylene propylene diene monomer (EPDM) rubber with a Shore hardness of 60A and a thickness of 5mm. A Φ22mm through hole is opened on its upper surface, so that the top of the positioning pin penetrates the pad and protrudes 5mm outward, ensuring that the vertical force transmission connector 101 can accurately fall into the gap.

[0060] The vertical force transmission connector 101 is a high-strength alloy steel stepped bushing structure, which is forged and tempered from 40CrNiMoA alloy steel with a hardness of HRC32-36. The vertical force transmission connector 101 includes an upper large-diameter section, a middle transition cone section, and a lower small-diameter section: the upper large-diameter section has an outer diameter of 40mm and a length of 50mm, and its outer circumferential surface is machined with an M40×2.0 external thread for engaging with the threaded sleeve on the bottom surface of the sliding adjustment block; the lower small-diameter section has an outer diameter of 25mm and a length of 80mm, and its end is provided with a 2×45° chamfer; the lower small-diameter section is fitted with a low thermal conductivity shear bushing made of polyetheretherketone (PEEK) material with an interference fit on its outer circumference. The bushing has a wall thickness of 3.5mm, an outer diameter of 38mm, a length of 70mm, a thermal conductivity of not more than 0.4W / (m·K), and a compressive strength of not less than 120MPa; during installation, the lower small-diameter section of the vertical force transmission connector (101) guides the low thermal conductivity shear bushing into the gap between two adjacent positioning pins under the action of the guide chamfer. The bushing's outer diameter (Φ38mm) and the net distance between the inner sides of the two pins (calculated value: 60mm-22mm=38mm) form a zero-clearance transition fit. After installation, it forms a double-sided pressing contact with the sides of the two adjacent positioning pins, directly transmitting horizontal shear force. Rotating the adjusting screw to apply a vertical load can further increase the pressing force on this contact surface, ensuring the overall rigidity of the joint. This connector transmits the design shear force through the bushing. The design shear force does not exceed 15kN and does not participate in the transmission of horizontal tensile force, thus avoiding the formation of continuous thermal bridges.

[0061] The low thermal conductivity shear bushing is made of polyetheretherketone (PEEK) or polyamide (PA) filled with ceramic particles. Its key performance parameters are: thermal conductivity ≤0.4 W / (m·K), tensile strength ≥80 MPa, flexural modulus ≥3.5 GPa, and long-term service temperature ≥120℃. The bushing is fixed by hot pressing or injection molding on the lower small-diameter section of the connector.

[0062] The top support surface 106 of the beam has a locally thickened structure in the projection area of ​​the corresponding vertical force transmission connector 101. The thickness of the thickened layer is 60mm, and the reinforcement adopts a two-way Φ10@150 steel mesh with a reinforcement ratio of 0.42% to enhance the local bearing capacity and prevent concrete crushing.

[0063] The horizontal limit adjustment mechanism 105 includes an L-shaped limit bracket fixed to the inner side of the outer leaf panel at the bottom of the wall panel, a fine-tuning screw installed on the horizontal section of the L-shaped limit bracket, and a high-density polyethylene (HDPE) buffer strip pasted to the corresponding position on the side wall of the beam.

[0064] The L-shaped limiting bracket is formed by bending a 6mm thick hot-dip galvanized steel sheet (zinc layer thickness ≥80g / m²). The vertical section is 100mm high and 50mm wide, and is connected to an 8mm thick Q235B steel plate pre-embedded on the inner side of the outer leaf panel by M10 chemical anchors (rebar depth 80mm, adhesive is modified epoxy resin). The horizontal section is 80mm long and 50mm wide, and an M12×1.75 threaded hole is drilled at the center of its end.

[0065] The fine-threaded adjusting screw is an M12×1.75 fine-pitch screw made of 45# steel with a blackened surface. Its front end has a freely rotatable hemispherical cap (or a spherical structure with a radius R=5mm) that abuts against the HDPE buffer strip surface. The HDPE buffer strip has a density of 960kg / m³, a thickness of 10mm, a width of 50mm, and a length determined by the wall panel segmentation. It is adhered to the beam sidewall using MS modified silane weather-resistant structural adhesive (elastic modulus ≤0.4MPa, displacement capacity ±25%). Its surface is polished, with flatness deviation controlled within 0.8mm / m. Rotating the fine-threaded adjusting screw allows for millimeter-level positional correction of the wall panel in the horizontal plane, with a single adjustment accuracy of 0.1mm, ensuring that the alignment deviation between the wall panel axis and the beam axis does not exceed ±2mm.

[0066] The composite sealing and plugging system 104 is composed of three layers of functional materials, which are, from the inside out, an inner airtight membrane layer, a middle thermal insulation filling layer, and an outer waterproof and breathable membrane layer.

[0067] The inner airtight membrane layer is an aluminum foil composite polyethylene film (AL / PE) with a total thickness of 0.2mm, of which the aluminum foil is 12μm thick and the polyethylene layer is 94μm thick. Its inner surface is coated with butyl rubber pressure-sensitive adhesive (initial tack ≥10N / 25mm, holding power ≥72h). It is directly pasted to the gap between the bottom edge of the inner leaf panel and the top surface of the beam. Before pasting, the concrete surface must be dusted and degreased to ensure that the bonding strength is not less than 0.8N / mm.

[0068] The central insulation filling layer uses on-site foamed closed-cell phenolic foam, which is made by mixing two-component liquid phenolic resin (component A: phenolic prepolymer; component B: mixture of curing agent and foaming agent) at a mass ratio of 1:1.2 and then injecting it into the cavity. The foaming ratio is 25 times, the density after curing is 45kg / m³, the thermal conductivity is 0.021W / (m·K), the closed-cell rate is ≥92%, and the filling density is not less than 95% as detected by infrared thermal imaging. It completely covers the exposed parts of the vertical force transmission connector 101 and the horizontal limit adjustment mechanism 105.

[0069] The outer waterproof and breathable membrane layer is a polytetrafluoroethylene (PTFE) microporous membrane composite nonwoven fabric. The PTFE membrane has a pore size of 0.2μm, a measured water vapor permeability of 1650g / (m²·24h), and a hydrostatic compressive strength of 22kPa. It is mechanically fixed to the junction of the bottom edge of the outer leaf panel and the beam side wall by a 1.0mm thick 304 stainless steel strip (25mm wide) and ST4.2×16 self-tapping screws. The screw spacing is 250mm. An EPDM sealing strip is installed between the strip and the membrane layer to prevent leakage through the nail holes.

[0070] In addition, this embodiment also discloses a construction method for a hollow composite sandwich insulation wall panel and beam connection device, including the following steps:

[0071] The first step involves pre-embedding the lower anchoring component 103 at a designated position at the bottom of the inner leaf panel during the factory prefabrication of the hollow composite sandwich insulated wall panel. The pre-embedding process is completed before concrete pouring. The U-shaped anchoring groove is fixed to the inside of the template using positioning fixtures, ensuring that the distance between its bottom surface and the bottom surface of the template is 120mm (i.e., the thickness of the inner leaf panel), with the positional tolerance controlled within ±2mm. At the same time, an L-shaped limiting bracket is installed 150mm from the bottom edge on the inner side of the outer leaf panel, and a clean bonding surface with a width of 100mm is reserved at the bottom edge of the wall panel. No release agent is applied to this area, and the surface roughness Ra=3.2μm.

[0072] The second step, during the beam component fabrication stage, involves pre-embedding the upper anchoring assembly 102 within the top support surface 106 of the beam. For concrete beams, the anchoring steel plate is placed on top of the formwork after the reinforcement is tied and fixed with temporary supports to ensure that its upper surface is consistent with the design elevation of the beam top. For steel beams, ribbed stiffening plates are first welded to the top flange, and then the anchoring steel plate is fixed to the stiffening plate by plug welding (weld holes Φ18mm, spacing 100mm). Subsequently, positioning pins are welded and an elastic buffer pad is laid.

[0073] The third step is to use a special hoisting tool (including a four-point balance hook) to lift the wall panel to about 300mm above the beam and lower it slowly so that the lower small diameter section of the vertical force transmission connector 101 falls accurately into the gap between the adjacent positioning pins. At the same time, the L-shaped limiting bracket is close to the side wall of the beam, and the initial gap is controlled at 5-10mm.

[0074] The fourth step involves using a specialized Allen wrench to rotate the adjusting screw and adjust the vertical position of the sliding adjusting block within the U-shaped anchoring groove, ensuring the designed gap between the bottom of the wall panel and the top surface of the beam is controlled within 15±2mm. During the adjustment process, a laser rangefinder is used to monitor the gap height in real time, with an accuracy of ±0.5mm.

[0075] Fifth, operate the fine-tuning screw, rotating it 1 / 4 turn each time (corresponding to a displacement of approximately 0.44 mm), and push the wall panel to make horizontal fine adjustments until the wall panel axis measured by the total station is aligned with the beam axis, with a deviation not exceeding ±2 mm. After fine-tuning, tighten the screw to 5 N·m with a torque wrench to prevent springback.

[0076] Step 6: Apply the inner airtight membrane layer to the inner gap at the junction of the wall panel and the beam. Before applying, clean a 75mm area on both sides of the joint with a non-woven fabric soaked in isopropyl alcohol. After the solvent evaporates, apply the membrane immediately, using a rubber roller to roll from the center outwards to remove air bubbles and ensure a seamless bond.

[0077] Step 7: Inject liquid two-component phenolic resin foaming agent into the joint cavity through the pre-reserved injection port on the outside (located at the junction of the bottom outer leaf panel of the wall panel and the side wall of the beam, with a size of Φ20mm). The injection port spacing is 600mm, the grouting pressure is controlled at 0.3MPa, and the grouting volume is calculated based on the cavity volume (theoretical volume = wall panel length × design gap height × joint depth × 1.1 safety factor (where the cavity depth is taken as 20mm, consistent with the design gap height)). After the foaming agent overflows from the vent hole, seal it. The curing time at room temperature is 4 hours.

[0078] Step 8: Install the outer waterproof and breathable membrane layer. Cut it to cover the seam and extend it 100mm to each side. Fix it with stainless steel strips using self-tapping screws. The screws should penetrate the outer leaf panel and beam side wall to a depth of not less than 25mm, and the overlap length of the strips should not be less than 50mm.

[0079] Step 9: Apply an anti-corrosion coating system to all exposed metal connection parts (including the exposed section of the adjusting screw, L-shaped bracket, pressure strip, etc.). The bottom layer is epoxy zinc-rich primer (zinc content ≥80%, dry film thickness 60μm), and the top layer is aliphatic polyurethane topcoat (dry film thickness 60μm). The total dry film thickness is 120μm, and the coating adhesion (cross-cut test) reaches level 0.

[0080] Furthermore, when applied to areas with seismic fortification intensity of 8 degrees or above, an energy-dissipating damping pad is added between the inner leaf panel at the bottom of the wall panel and the top surface of the beam. The energy-dissipating damping pad consists of a three-layer laminated structure: the top and bottom layers are 0.5mm thick 304 stainless steel sheets, and the middle layer is 14mm thick high-damping rubber (HDNR), all three are integrally formed through a vulcanization process; the pad size is 100mm×100mm, the shear modulus is 1.2MPa, the equivalent damping ratio is 18%, and it can generate a maximum horizontal displacement of 15mm under rare earthquake action and dissipate energy through hysteresis loops, improving the nodal ductility coefficient to above 3.5.

[0081] In practice, the following are specific implementation examples:

[0082] Using the aforementioned hollow composite sandwich insulated wall panel and beam connection device, a 1:1 wall-beam joint specimen was fabricated. The wall panel dimensions were 3000mm (height) × 1200mm (width) × 220mm (thickness), and the beam was a 300mm × 600mm cast-in-place concrete beam. After the joint was installed, thermal performance tests (according to GB / T 13475), structural performance tests (according to JGJ 1-2014), and airtightness tests (according to GB / T 7106) were conducted.

[0083] Comparative Example 1: The traditional wet connection method was adopted, that is, the steel bars pre-reserved at the bottom of the wall panel were inserted into the top of the beam and poured into the post-cast strip, and C40 micro-expansion concrete was poured on site with formwork. After curing for 28 days, the same performance indicators were tested.

[0084] The test results are shown in Table 1 below:

[0085] Table 1:

[0086]

[0087] Shear force transfer performance verification: A horizontal low-cycle reciprocating loading test was conducted on the installed node specimen. The test results showed that when the horizontal shear force reached 15 kN, the low thermal conductivity shear bushing (PEEK) was in an elastic working state, and there was no obvious slippage at the node; the residual deformation after unloading was less than 0.5 mm. This verification confirms the feasibility of the bushing in transferring the design shear force.

[0088] Thermal performance verification: The heat transfer coefficient of the node region was tested using the heat flow meter method (according to GB / T 10295). Under steady-state heat transfer conditions, compared with nodes without the low thermal conductivity shear bushing, the former reduced the heat flow through the vertical force transmission connector by more than 85%, proving that the structure is effective in blocking the metal thermal bridge path.

[0089] Test data show that Example 1 is significantly better than Comparative Example 1 in terms of thermal performance, with a 39.5% reduction in the overall wall heat transfer coefficient and a significant reduction in the thermal bridge effect; the structural performance meets the specifications and has stronger horizontal deformation capacity; the airtightness meets the high airtight building standard; the construction efficiency is improved by 61.5%, and there is no wet work at all.

[0090] Furthermore, accelerated aging tests (85°C / 85%RH, 2000 hours) were conducted on the node of Example 1. After the test, the performance retention rate of each component was as follows:

[0091] Adjusting screw anti-loosening structure: Locking function is intact, no displacement;

[0092] EPDM cushioning layer: compression set ≤15%;

[0093] Phenolic foam insulation layer: thermal conductivity change rate ≤5%;

[0094] Anti-corrosion coating: Adhesion remains at level 0, with no bubbling or peeling.

[0095] To further block the thermal bridge formed by the adjusting screw, an insulating sleeve made of rigid polyurethane or glass fiber reinforced plastic can be fitted outside the section of the adjusting screw that passes through the inner blade panel (107).

[0096] Example 2: This example is basically the same as Example 1, except that the middle insulation filling layer in the composite sealing and plugging system is replaced with gradient composite insulation material to improve thermal continuity and construction efficiency.

[0097] The central insulation filling layer is a gradient composite insulation material, which is composed of a closed-cell phenolic foam layer, a nano-aerogel felt layer and a reinforcing fiber blanket layer from the inside out through a hot-pressing process. The density of the closed-cell phenolic foam layer is 45 kg / m³, the density of the nano-aerogel felt layer is 180 kg / m³, and the measured thermal conductivity at room temperature and pressure is 0.016 W / (m·K). The density of the reinforcing fiber blanket layer is 60 kg / m³, and the overall thermal conductivity is not greater than 0.020 W / (m·K). The thermal conductivity of the reinforcing fiber blanket layer is not greater than 0.025 W / (m·K). The thickness is 25 mm, the compressive strength is not less than 0.3 MPa, and the water vapor permeability is not greater than 1.5 g / (m²·24h).

[0098] Furthermore, a double-sided pressure-sensitive adhesive layer is provided between the outer surface of the gradient composite insulation material and the outer waterproof and breathable membrane layer. The double-sided pressure-sensitive adhesive layer is an acrylic adhesive with a thickness of 0.1 mm and an initial tack of not less than 15 N / 25 mm. The gradient composite insulation material is cut into strips and directly embedded into the joint cavity without the need for on-site foaming.

[0099] In specific implementation, the process parameters are as follows:

[0100] The gradient composite insulation material is prepared using a continuous hot-pressing production line, and the specific method is as follows:

[0101] First, a closed-cell phenolic foam layer (15mm thick, 45kg / m³ density, 0.022W / (m·K)) is laid, followed by a nano-aerogel felt layer (5mm thick, 180kg / m³ density, SiO₂ content ≥90%, thermal conductivity 0.016W / (m·K)). Finally, a reinforcing fiber blanket layer (5mm thick, 60kg / m³ density, basalt fiber volume fraction 20%, tensile strength ≥8MPa) is layered on top. Hot-pressing process parameters: temperature 150°C±5°C, pressure 0.5MPa±0.1MPa, time 10min±1min. The overall thickness of the molded material is 25mm, with a measured thermal conductivity of 0.017W / (m·K) and a compressive strength of 0.35MPa.

[0102] The gradient composite insulation material is prepared using a continuous hot-pressing production line. Each layer of material undergoes surface activation treatment before hot pressing to ensure that the interlayer bonding strength is not less than 0.5 MPa.

[0103] During installation, cut the gradient material into strips with a width of 18mm according to the joint cavity dimensions (width = design gap 15mm + allowable tolerance 2mm). Apply acrylic double-sided pressure-sensitive adhesive (initial tack 18N / 25mm) to the outer surface of the gradient material, insert it directly into the cavity, and press it until it is tightly bonded to the inner airtight membrane layer and the outer waterproof and breathable membrane layer. No liquid foaming agent is required, eliminating the curing time.

[0104] Technical effect comparison data:

[0105] Thermal performance testing (according to GB / T 13475) showed that, compared with traditional on-site foamed phenolic foam, the gradient composite material reduced the overall wall heat transfer coefficient in the joint area from 0.28 W / (m²·K) to 0.22 W / (m²·K), and the thermal bridge line heat transfer coefficient Ψ from 0.03 W / (m·K) to 0.015 W / (m·K). In temperature cycling tests (-20°C to 60°C, 100 cycles), the gradient material showed no interface separation, with a thermal resistance attenuation rate of <1%, while the traditional foamed material showed an attenuation rate of >8%.

[0106] The installation time for the sealing system has been reduced from 10 minutes per node to 6 minutes per node, a reduction of 40%. The filling density reached 98% as detected by infrared thermal imaging, with no void defects.

[0107] In an accelerated aging environment (85°C / 85%RH, 2000 hours), the change rate of thermal conductivity of the gradient material is <2%, and the mass loss rate is <0.5%, which meets the long-term performance requirements of near-zero energy buildings.

[0108] This embodiment eliminates the interfacial thermal resistance of the multi-layer sealing system by using gradient materials, thereby improving thermal stability and durability. At the same time, it simplifies the construction process, reduces reliance on wet operations, and is suitable for areas with high humidity or large temperature differences (such as coastal or northwestern regions). The maintenance cycle is expected to be extended by more than 30%.

[0109] This invention utilizes a non-contact stepped bushing force transmission mechanism to construct a closed force flow path from the lower anchoring component through the vertical force transmission connector to the upper anchoring component. Simultaneously, it completely severs the metal heat conduction channel using physical gaps, achieving physical decoupling of the force flow and heat flow paths. The lower anchoring component is used for vertical precision adjustment, the horizontal limit adjustment mechanism enables fine-tuning of the planar position and temperature stress release, the vertical force transmission connector bears the core load transmission, and the composite sealing system independently ensures thermal continuity and airtightness / watertightness. This overcomes the technical problems caused by the mixed functions of connecting components in existing technologies.

[0110] This invention ensures that the vertical bearing capacity and horizontal deformation capacity of the joints meet the specifications, while significantly improving the overall thermal performance of the wall panel and essentially eliminating the thermal bridging effect in the joint area. Simultaneously, the entire device achieves completely dry operation, greatly improving installation efficiency and precision, and achieving a balance between structural safety, building energy conservation, and ease of construction.

[0111] The anti-loosening mechanical locking structure, ceramic-based heat-insulating coating, high-hardness wear-resistant layer on the surface of the positioning pin, and material stability of the composite sealing and plugging system constitute a long-term performance guarantee system for the joint, solving the problems of loosening, corrosion, and performance degradation that are prone to occur in traditional connection methods.

[0112] This invention achieves a balance between structural safety, thermal continuity, construction efficiency, and system adaptability through a dry connection construction system that completely isolates the force flow transmission path and the heat flow conduction path in physical space.

[0113] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hollow composite sandwich insulated wall panel and beam connection device, wherein the hollow composite sandwich insulated wall panel includes an inner leaf panel, an outer leaf panel, a sandwich insulation layer sandwiched between the two, and a tie member penetrating the sandwich insulation layer to connect the two panels, and the beam has a support surface at the top, characterized in that, The connecting device comprises: a lower anchoring assembly pre-buried in the bottom of the inner leaf panel, the lower anchoring assembly comprising a downwardly open U-shaped anchoring groove, a sliding adjusting block slidingly embedded in the U-shaped anchoring groove, a threaded sleeve fixed to the bottom surface of the sliding adjusting block, and an adjusting screw rod penetrating through the inner leaf panel and threadedly matched with the threaded sleeve; an upper anchoring assembly pre-buried in the top bearing surface of the beam, the upper anchoring assembly comprising an anchoring steel plate, a plurality of positioning pin columns welded to the upper surface of the anchoring steel plate, and an elastic buffer pad layer covering the upper surface of the anchoring steel plate and having through holes for the top ends of the positioning pin columns to pass through; a vertical force transmission connecting piece, the upper large-diameter section of which is threadedly connected with the threaded sleeve, and the lower small-diameter section of which is inserted into the gap between the adjacent two positioning pin columns, and the outer circumferential surface of which is sleeved with a low-thermal-conductivity shear-resistant bushing which is in compressive contact with the side surfaces of the adjacent two positioning pin columns; a horizontal limiting and adjusting mechanism, comprising an L-shaped limiting support fixed to the inner side of the outer leaf panel, a fine adjustment top screw installed on the horizontal section of the L-shaped limiting support, and a high-density polyethylene buffer strip pasted to the side wall of the beam and in abutment with the front end of the fine adjustment top screw; a composite sealing and plugging system, comprising, from inside to outside, an inner air-tight film layer pasted to the joint between the bottom of the inner leaf panel and the top surface of the beam, a middle heat-insulating filling layer filled in the joint cavity, and an outer waterproof and air-permeable film layer fixed to the joint between the bottom of the outer leaf panel and the side wall of the beam by a stainless steel pressing strip.

2. A hollow composite sandwich panel and beam connection device according to claim 1, characterised in that: The U-shaped anchoring grooves are arranged at intervals along the length direction of the hollow laminated sandwich heat-insulating wall panel, and the side flanges are mechanically anchored with the stress-reinforced steel mesh in the inner leaf panel through pre-buried connecting pieces; the sliding adjusting block can slide in the U-shaped anchoring groove in a direction perpendicular to the plane of the wall panel, and the bottom surface center is provided with an internally threaded hole for screwing with the adjusting screw rod; the upper end of the adjusting screw rod penetrates through the reserved through hole in the bottom of the inner leaf panel and is fixed to the inner side of the inner leaf panel by a locking nut.

3. A hollow composite sandwich panel and beam connection device according to claim 1, characterised in that: The anchoring steel plate is made of low-alloy high-strength structural steel; the positioning pin columns are cylindrical stainless steel pins arranged in a rectangular array on the upper surface of the anchoring steel plate, and the row direction of the array is parallel to the length direction of the beam; the elastic buffer pad layer is made of ethylene-propylene-diene rubber and has a Shore hardness of 60±5A.

4. A hollow composite sandwich panel and beam connection device according to claim 1, characterised in that: The vertical force transmission connecting piece is a stepped shaft sleeve structure, comprising an upper large-diameter section, a lower small-diameter section, and a middle transition cone section with a taper angle of 15° connecting the two sections; the end of the lower small-diameter section is provided with a chamfer, and the outer circumferential surface thereof is sleeved with a low-thermal-conductivity shear-resistant bushing; the low-thermal-conductivity shear-resistant bushing is in compressive contact with the side surfaces of the adjacent two positioning pin columns.

5. The hollow composite sandwich wall panel-to-beam connection apparatus of claim 1, wherein: The L-shaped limiting support is formed by bending a hot-dip galvanized steel plate, and the vertical section is connected with the pre-buried steel plate on the inner side of the outer leaf panel by chemical anchor bolts; the high-density polyethylene buffer strip has a density not less than 950 kg / m³ and is pasted to the side wall of the beam by weather-resistant silicone structural adhesive.

6. A hollow composite sandwich panel and beam connection device according to claim 1, characterised in that: The inner airtight film layer is an aluminum foil composite polyethylene film coated with butyl rubber pressure-sensitive adhesive on the inner surface; the middle thermal insulation filling layer is in-situ foamed closed-cell phenolic foam with a thermal conductivity of not more than 0.022 W / (m·K) and a density of 45 kg / m³; and the outer waterproof and air-permeable film layer is a polytetrafluoroethylene microporous film composite non-woven fabric with a water vapor permeability of not less than 1500 g / (m²·24h) and a hydrostatic pressure resistance of not less than 20 kPa.

7. A hollow composite sandwich panel and beam connection device according to claim 1, characterised in that: The rod body of the adjusting screw is provided with a ring-shaped groove or a radial locking hole; and the inner wall or the side wall of the threaded sleeve is provided with an elastic locking pin; when the adjusting screw is screwed to the set position, the ring-shaped groove or the radial locking hole moves to correspond to the elastic locking pin, and the locking pin is embedded in the ring-shaped groove or the radial locking hole under the action of the elastic force to form a mechanical locking structure.

8. A hollow composite sandwich panel and beam connection device according to claim 1, characterised in that: The inner wall of the U-shaped anchoring groove is coated with a ceramic-based thermal barrier coating with a thermal conductivity of less than 1.5 W / (m·K).

9. A hollow composite sandwich panel and beam connection according to claim 3, wherein, The surface of the positioning pin column is provided with an alumina ceramic spray coating with a microhardness HV≥1200.

10. A method of constructing a hollow composite sandwich panel and beam connection as claimed in any one of claims 1 to 9, wherein, The method comprises the following steps: Embed the lower anchoring assembly and install the L-shaped limiting support when the wall panel is prefabricated in the factory, and reserve the bottom clean bonding surface; Embed the upper anchoring assembly as a whole in the top bearing surface of the beam during the beam component manufacturing stage; Hoist the wall panel on site, accurately align the lower small-diameter section of the vertical load transmission connecting piece with the low-thermal-conductivity shear-resistant bushing to the gap between the adjacent positioning pin columns, and then apply vertical load by rotating the adjusting screw to provide initial pre-tightening force, so that the low-thermal-conductivity shear-resistant bushing is in tight contact with the side surface of the positioning pin column; Rotate the adjusting screw to control the gap between the bottom of the wall panel and the top surface of the beam to be 15±2 mm; Perform horizontal fine adjustment by operating the fine adjustment top screw to align the axis of the wall panel with the axis of the beam with an alignment deviation of not more than ±2 mm; and paste the inner airtight film layer at the inner joint; Fill the two-component closed-cell phenolic foam foaming agent into the joint cavity through the reserved glue injection hole, so that it is filled and solidified at room temperature to form the middle thermal insulation filling layer; Install the outer waterproof and air-permeable film layer and fix it with stainless steel pressing strips; Coat the exposed metal parts with an anticorrosive coating with a total dry film thickness of not less than 120 μm.

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