Honeycomb composite board connecting structure and system based on stone for building

Abstract

The invention discloses a stone honeycomb composite board connecting structure based on a building. The stone honeycomb composite board connecting structure comprises a base body, a threaded sleeve, a ball head screw, a locking nut, a transverse keel, a longitudinal keel and a composite board. The base body is of a rotary cylindrical structure; the threaded sleeve is of a rotary body cylinder structure and is detachably connected with the base body. The ball head screw rod is arranged in the threaded sleeve in a direction-adjustable manner; the locking nut is arranged in the threaded sleeve and abuts against the ball head screw. The transverse keel is detachably connected with the ball head screw; the longitudinal keels are detachably connected with the transverse keels; and the composite plate is fixedly connected with the base body.

Description

Technical Field

[0001] This invention relates to the field of building curtain wall technology, and more specifically, to a connection structure based on building stone honeycomb composite panels. Background Technology

[0002] Currently, common connection methods in the market are mainly divided into two categories: traditional dry-hanging stone method and special back-bolt method for composite panels. Traditional dry-hanging method usually requires slotting on the side or back of the panel to embed metal hangers. This method has significant problems when applied to stone honeycomb composite panels: First, slotting severely damages the fragile composite structure of the stone surface layer and honeycomb core, creating stress concentration points that easily lead to cracking of the panel at the slotted point under repeated wind loads or temperature stresses. Second, exposed hangers or wide joints affect the overall aesthetics of the curtain wall. While the special back-bolt method uses a back connection, its connection points are usually rigidly fixed, lacking effective three-dimensional adjustment and stress release capabilities. When the curtain wall system expands and contracts due to temperature changes, this rigid connection will transfer huge internal stresses to the panel and the connectors themselves, posing a long-term safety hazard. Furthermore, regardless of the method, installation heavily relies on worker experience, requiring multiple tedious steps such as drilling, fine-tuning, and tightening, resulting in low efficiency and difficulty in ensuring uniform stress distribution at each connection point.

[0003] At the design and construction levels, existing processes are typically based on standardization and engineering experience. The arrangement of connection points often follows a simple "uniform distribution" principle, that is, mechanically setting the same number of connectors at fixed intervals on the back of each panel. This "one-size-fits-all" approach may be wasteful for regular rectangular panels, and is extremely unreasonable for increasingly popular irregular shapes such as triangles, trapezoids, and curved panels, which may lead to insufficient connection points in some areas, posing safety hazards, or excessive connection points, resulting in waste of materials and labor.

[0004] The design of the keel system also largely relies on standard modules, which cannot be optimized according to the actual load path, resulting in excessive steel consumption.

[0005] More significantly, existing technologies separate "design," "component production," and "on-site installation." The design phase cannot accurately predict the actual stress at each connection point in the final installed state, nor can it simulate the complex impact of adding new panels on the stress state of already installed sections during dynamic installation. Construction relies entirely on two-dimensional drawings and on-site worker judgment. Key process parameters such as installation sequence and tightening torque lack scientific and data-driven guidance, leading to uncertainty in the final performance of the curtain wall system and hindering truly refined cost control.

[0006] The purpose of this invention is to provide a connection structure based on building stone honeycomb composite panels to solve the problems in the prior art.

[0007] The above-mentioned technical objective of this invention is achieved through the following technical solution: a connection structure based on a building stone honeycomb composite panel, comprising: a base body, a threaded sleeve, a ball-end screw, a locking nut, a transverse keel, a longitudinal keel, and a composite panel; the base body is a cylindrical structure of revolution; the threaded sleeve is a cylindrical structure of revolution and is detachably connected to the base body; the ball-end screw is directionally adjustable and disposed within the threaded sleeve; the locking nut is disposed within the threaded sleeve and abuts against the ball-end screw; the transverse keel is detachably connected to the ball-end screw; the longitudinal keel is detachably connected to the transverse keel; and the composite panel is fixedly connected to the base body.

[0008] Through the overall structural design, a detachable flexible connection between the composite panel and the keel is achieved, which solves the problems of inconvenient disassembly and assembly and poor angle adjustment flexibility of the existing connection structure. At the same time, each component has a clear division of labor, and the connection position and angle can be precisely adjusted according to the installation requirements, which improves the adaptability in the construction process. Moreover, the overall structure is compact, the connection is stable, and it can effectively bear the weight of the composite panel, reduce the risk of falling off after installation, and extend the service life of the composite panel.

[0009] The present invention is further configured such that: one end of the base body is provided with a stepped hole, a section of the stepped hole near the end face of the base body is provided with an internal thread, a section of the stepped hole away from the end face of the base body is an optical axis, and an annular inverted tooth is provided on the circumferential surface of the base body near the other end face. The annular inverted tooth is inserted into the honeycomb of the composite board and engaged, and the end face of the base body is bonded to the stone.

[0010] The internal thread section of the stepped hole facilitates precise thread engagement with the threaded sleeve, ensuring a tight and secure connection. The smooth shaft section guides and limits the insertion depth of the threaded sleeve, preventing assembly deviations. The annular reverse teeth are inserted into the honeycomb structure of the composite board to form a mechanical snap-fit, which, together with the end face bonding, achieves double fixation. Compared with a single bonding method, this greatly improves the connection strength between the base body and the composite board, preventing loosening of the connection due to bonding aging during long-term use. At the same time, the reverse tooth structure can adapt to the porous characteristics of the honeycomb board, increasing the contact area, making the force more even, and protecting the honeycomb structure of the composite board from damage.

[0011] The present invention is further configured such that: the outer periphery of the threaded sleeve is provided with an external thread that matches the stepped hole, and the circumferential surface of the non-extending end of the threaded sleeve is provided with a radially outward flange.

[0012] The matching internal and external threads make the connection between the threaded sleeve and the base body more precise and detachable, which facilitates later maintenance and component replacement. Compared with fixed connection methods such as welding, it reduces the difficulty of installation and disassembly. The radial flange provides a force point for the screwing operation of the threaded sleeve, which makes it convenient for construction personnel to quickly assemble with tools. At the same time, the flange can limit the insertion depth of the threaded sleeve to avoid excessive insertion and damage to the base body or composite plate, and ensure assembly consistency.

[0013] The present invention is further configured such that the annular inverted teeth are inclined inverted tooth structures with triangular cross-sections arranged at uniform intervals.

[0014] The triangular cross-section of the inverted tooth structure provides higher strength and allows for effective embedding within the honeycomb holes of the composite panel, enhancing connection stability. Compared to other cross-sectional shapes, the tips of the triangular inverted teeth are easier to insert into the honeycomb structure and are less prone to deformation. The evenly spaced inverted teeth ensure uniform stress distribution, preventing localized stress concentration that could damage the honeycomb holes of the composite panel. The inclined structure also creates a reverse anti-detachment effect, further preventing the base body from separating from the composite panel and improving the reliability of the connection.

[0015] The present invention is further configured such that: an internal thread section for connecting with the locking nut is provided on the inner circumferential surface of the end of the threaded sleeve away from the flange; a spherical groove for accommodating the ball head screw is provided in the middle of the threaded sleeve; and a chamfer is provided on the edge of the threaded sleeve near the flange.

[0016] The ball head screw can be precisely locked and loosened by engaging with the internal thread section and the lock nut, facilitating the adjustment of the ball head screw's angle before fixing and ensuring connection stability. The spherical groove adapts to the ball head screw, providing space for multi-angle rotation and solving the problem of limited angle adjustment range in existing connection structures, meeting the needs of different installation conditions. The chamfered edge structure removes sharp edges, preventing scratches to operators or damage to other components during construction, while also facilitating the assembly of the threaded sleeve and the base body, reducing assembly resistance.

[0017] The present invention is further configured such that the flange and the end face of the base body are spaced apart.

[0018] The spacing provides a certain amount of space for assembly adjustment, which can prevent component deformation caused by the compression between the flange and the end face of the base body. It also makes it easier for construction personnel to observe the assembly status of the threaded sleeve and adjust the assembly position in a timely manner. In addition, the spacing space can also accommodate a small amount of dust or impurities, preventing the accumulation of impurities from affecting the sealing and firmness of the threaded connection, improving the anti-interference ability of the connection structure, and ensuring the stability of long-term use.

[0019] The present invention is further configured such that: the ball head screw includes a ball head and a screw portion, and the ball head and the screw portion are connected by a journal.

[0020] The ball head and the threaded sleeve are fitted with a spherical groove to achieve multi-angle rotation adjustment, improving the flexibility of the connection structure; the screw part is easy to connect with the transverse keel, making disassembly and assembly convenient and the connection firm; the journal, as a transition structure, can optimize the force transmission between the ball head and the screw part, avoid stress concentration that could lead to breakage at the connection, improve the overall structural strength of the ball head screw, and ensure that it can stably bear the weight of the transverse keel and the composite plate.

[0021] The present invention is further configured such that: the locking nut is an embedded nut with external threads on its outer circumferential surface, and the side of the locking nut near the ball head screw has a concave part.

[0022] The external thread on the outer circumference allows the locking nut to precisely engage with the internal thread section of the threaded sleeve, achieving embedded locking. Compared to external locking structures, this results in a more compact connection, occupies less space, and provides a more stable locking effect. The concave portion has a higher fit with the ball head of the ball screw, increasing the contact area during locking and making the pressure distribution more uniform. This prevents excessive local pressure from causing wear or deformation of the ball head and effectively prevents the ball screw from rotating or shifting during use, further enhancing the stability of the connection structure.

[0023] A connection system for stone honeycomb composite panel curtain walls includes the following steps:

[0024] S1: Establish a digital twin building information model that includes all curtain wall panels, allowable keel layout space, and connection structure mechanical parameters, and apply design loads;

[0025] S2: Based on the topology optimization algorithm, solve the optimal keel support system layout that satisfies the overall stiffness and strength constraints within the allowed space. The layout includes non-orthogonal longitudinal beams and transverse beams.

[0026] S3: Under the optimal keel layout, with the goal of maximizing the load-bearing ratio of the connection structure and reducing the total number of connection points, the connection point network is optimized. This optimization includes:

[0027] S31: For each plate, calculate the total support reaction force required under the design load;

[0028] S32: Based on the rated load-bearing capacity range of the single-point connection structure, the necessary number of dedicated connection points are initially allocated to the plate, and the design load of each dedicated connection point is located in the high-efficiency segment of the rated load-bearing capacity range;

[0029] S33: Identify the boundary area where adjacent plates can share the load, and arrange at least one common connection point for at least one pair of adjacent plates; the location of the common connection point is determined by finite element analysis, so that under the design load, the resultant force from each adjacent plate satisfies the preset equilibrium condition, and its total load is within the rated bearing capacity range.

[0030] S4: Simulate the installation sequence of the curtain wall, dynamically analyze the impact of each installation step on the load of the installed nodes, iteratively adjust the layout of the connection points and load distribution in S3, and ensure that the real-time load of all connection points does not exceed their rated bearing capacity range throughout the entire process from the installation of the first panel to the completion of the installation of the last panel.

[0031] S5: Based on the final optimized keel layout and connection point network layout scheme, generate the CNC machining coordinate file of the back connection point of each board and the corresponding keel positioning file;

[0032] S6: Based on the CNC machining coordinate file, precisely pre-drill holes and embed them in each board; based on the keel positioning file, install the optimized keel system on site.

[0033] The system optimization can significantly reduce the number of connection structures while ensuring connection stability, thereby reducing material usage and cost expenditure.

[0034] The present invention is further configured such that: the objective function of the connection point network optimization layout in step S3 is to minimize the sum of the total number of connection points and the variance of the bearing capacity of all connection points, under the premise of satisfying all structural constraints.

[0035] By pre-setting all structural preload conditions and minimizing the total number of connection points, the preload of each structure is rationally planned to maximize its potential.

[0036] In summary, the present invention has the following beneficial effects: through the overall structural design, a detachable flexible connection between the composite panel and the keel is achieved, solving the problems of inconvenient disassembly and assembly and poor angle adjustment flexibility of the existing connection structure. At the same time, each component has a clear division of labor, and the connection position and angle can be precisely adjusted according to the installation requirements, which improves the adaptability in the construction process. Moreover, the overall structure is compact, the connection stability is strong, it can effectively bear the weight of the composite panel, reduce the risk of falling off after installation, and extend the service life of the composite panel. Attached Figure Description

[0037] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0038] Figure 2 This is an exploded view of Embodiment 1 of the present invention;

[0039] Figure 3 This is a flowchart from Embodiment 2 of the present invention.

[0040] In the picture:

[0041] 1. Base body; 11. Annular reverse teeth; 12. Stepped hole; 2. Threaded sleeve; 21. Spherical groove; 3. Ball head screw; 31. Ball head; 32. Screw part; 4. Locking nut; 41. Concave part. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below, but the scope of protection of the present invention is not limited to the following description.

[0049] Example 1

[0050] This embodiment provides a connection structure based on building stone honeycomb composite panels, including:

[0051] The base body 1 has a rotating cylindrical structure.

[0052] The threaded sleeve 2 has a rotating cylindrical structure and is detachably connected to the base body 1.

[0053] The ball head screw 3 is oriented in an adjustable manner and is located inside the threaded sleeve 2.

[0054] The locking nut 4 is located inside the threaded sleeve 2 and abuts against the ball head screw 3.

[0055] The transverse keel is detachably connected to the ball head screw 3.

[0056] The longitudinal keel can be detachably connected to the transverse keel;

[0057] The composite plate is fixedly connected to the base body 1.

[0058] One end of the base body 1 is provided with a stepped hole 12. The section of the stepped hole 12 near the end face of the base body 1 is provided with an internal thread, and the section of the stepped hole 12 away from the end face of the base body 1 is an optical axis. The circumferential surface of the base body 1 near the other end face is provided with annular inverted teeth 11. The annular inverted teeth 11 are inserted into the honeycomb of the composite board and snapped together, and the end face of the base body 1 is bonded to the stone.

[0059] The outer periphery of the threaded sleeve 2 is provided with an external thread that matches the stepped hole 12, and the circumferential surface of the non-extending end of the threaded sleeve 2 is provided with a radially outward flange.

[0060] The annular inverted teeth are inclined inverted tooth structures with triangular cross-sections arranged at uniform intervals.

[0061] The inner circumferential surface of the threaded sleeve 2 away from the flange is provided with an internal thread section that connects to the locking nut 4. The middle part of the threaded sleeve 2 is provided with a spherical groove 21 for accommodating the ball head screw 3. The edge of the threaded sleeve 2 near the flange is provided with a chamfer.

[0062] The flange and the end face of the base body 1 are spaced apart.

[0063] The ball head screw 3 includes a ball head 31 and a screw part 32, which are connected by a journal.

[0064] The locking nut 4 is an embedded nut with external threads on its outer circumference, and the side of the locking nut 4 near the ball head screw 3 has a concave part 41.

[0065] The concave part 41 of the locking nut 4 is provided with a silicone pad for buffering and pressing, which abuts against the concave part 41 and the ball head 31 respectively. The silicone pad here also has the effect of preventing loosening, further enhancing the durability of the device.

[0066] The locking nut 4 has a through hexagonal hole at its geometric center of gravity for use with an internal hexagonal wrench.

[0067] Example 2

[0068] This embodiment provides a connection system for stone honeycomb composite panel curtain walls, including the following steps:

[0069] Step S1: Establish a digital twin building information model and apply loads.

[0070] A digital twin building information model is created, which includes all curtain wall panels, allowable space for keel arrangement, and mechanical parameters of the connecting structure. At the same time, design loads are applied to the model.

[0071] Step S2: Solve for the optimal keel support system layout using topology optimization.

[0072] Based on the topology optimization algorithm, within the allowable keel arrangement space determined in step S1, the optimal keel support system layout that satisfies the overall stiffness and strength constraints is solved. This layout may include non-orthogonal longitudinal beams and transverse beams.

[0073] Step S3: Optimize the deployment of the connection point network

[0074] Under the optimal keel layout, with the goal of maximizing the load-bearing ratio of the connection structure and reducing the total number of connection points, the connection point network is optimized and laid out.

[0075] Among them: maximize the load-bearing ratio of the connection structure + reduce the total number of connection points, and minimize the sum of the total number of connection points and the variance of the load-bearing capacity of all connection points;

[0076] This step must comply with the rated bearing capacity range constraints: the lower limit is 55% to 65% of the ultimate bearing capacity of the connection structure, and the upper limit is 75% to 85%; among which, the design load of the special connection point must be located in the high-efficiency section of the rated bearing capacity range, with an upper limit of 85% to 100%.

[0077] Step S3 is specifically divided into 3 sub-steps:

[0078] S31: Load reaction calculation, for each curtain wall panel, calculate the total support reaction required under the design load;

[0079] S32: Initial allocation of dedicated connection points. Based on the rated load-bearing capacity range of the single-point connection structure, the necessary number of dedicated connection points are initially allocated to each plate to ensure that the design load of each dedicated connection point is within the high-efficiency range.

[0080] S33: Layout of shared connection points: Identify the boundary areas where adjacent plates can share forces, and lay at least one shared connection point for at least one pair of adjacent plates; the location of the shared connection point needs to be determined by finite element analysis and must meet two conditions:

[0081] ① Under the design load, the combined force of each adjacent plate is within the rated bearing capacity range;

[0082] ② The component force of each adjacent plate is matched with the proportion of the design load distributed to that point. After the component force direction is coordinated, the node is in the optimal stress state and the equilibrium condition is preset.

[0083] Step S4: Installation sequence simulation and connection point parameter iterative adjustment: Plan the curtain wall installation sequence with construction operability as a constraint;

[0084] Dynamically analyze the impact of each installation step on the load of the installed nodes;

[0085] Based on the analysis results, iteratively adjust the layout of the connection points and the load distribution in step S3;

[0086] Core requirement: Ensure that the real-time load at all connection points does not exceed their rated bearing capacity range throughout the entire process from the installation of the first panel to the completion of the installation of the last panel;

[0087] The system records the theoretical load state after each installation step, forming an installation process card.

[0088] Step S5: Generate CNC machining and positioning files: Based on the final optimized keel layout and connection point network arrangement, generate two types of core files:

[0089] ① CNC machining coordinate files for the back connection points of each board;

[0090] ②The corresponding keel positioning file;

[0091] At the same time, each connection point is pre-embedded with a digital identifier, which links to its optimized design parameters in the digital twin model.

[0092] Step S6: Prefabrication of panels and installation of on-site joists

[0093] Based on the CNC machining coordinate files, precise pre-drilling and pre-embedding operations are carried out on each board; based on the keel positioning files, the optimized keel support system is installed on the construction site.

[0094] Step S7: On-site construction guidance

[0095] Based on the keel positioning file and connection point digital identifiers generated in step S5, augmented reality equipment is used at the construction site to position and guide construction personnel during installation, ensuring construction accuracy.

[0096] This embodiment provides a specific calculation process:

[0097] Step S1: Establish a digital twin building information model and apply loads.

[0098] S11. For the irregularly shaped curtain wall area of ​​the entrance lobby of a commercial complex, the area has an arc-shaped curved structure, with a curtain wall height of 8m, a width of 12m, and a total area of ​​96㎡; it uses irregularly shaped stone honeycomb composite panels, with a panel thickness of 30mm, a honeycomb core thickness of 20mm, and a total thickness of 50mm. The keel is made of 6063T5 aluminum alloy, and the connection structure uses 304 stainless steel connectors. The design service life is 50 years.

[0099] Core design conditions: seismic fortification intensity of 8 degrees (0.2g), basic wind pressure of 0.6kN / ㎡, ground roughness of Class C, the floor where the curtain wall is located is the 2nd floor and the height from the ground is 6m.

[0100] Model parameter settings:

[0101] Component type Key parameters Numerical / Standard Irregularly shaped stone honeycomb composite panel Elastic modulus E, Poisson's ratio, and surface density μ E=30GPa, μ=0.2, surface density 0.12kN / m² Aluminum alloy keel (6063T5) Elastic modulus E, Poisson's ratio μ, allowable stress [σ] E=70GPaμ=0.33[σ]=160MPa 304 stainless steel connectors Ultimate bearing capacity F, elastic modulus E F=8kNE=206GPa Allow space for keel layout Longitudinal beam spacing range, transverse beam spacing range 1.2-2.0m; 1.0-1.8m; (Adjustable in non-orthogonal areas)

[0102] S12. Application and Combination of Design Loads

[0103] According to the "Standard for Acceptance of Quality of Building Curtain Wall Engineering" (GB / T50210-2018), the load type and value are determined as follows:

[0104] Dead load (G): Weight of plate + weight of connectors = 0.12 + 0.03 = 0.15 kN / m²

[0105] Wind load (W): Basic wind pressure × height coefficient × shape coefficient × gust coefficient = 0.6 × 1.1 × 1.2 × 1.4 = 1.1088 kN / ㎡ (take 1.11 kN / ㎡).

[0106] Seismic action (E): Horizontal seismic influence coefficient × representative value of gravity load = 0.16 × 0.15 = 0.024 kN / ㎡ (take 0.03 kN / ㎡).

[0107] Basic load combination (for strength calculation): S = 1.2G + 1.4W + 1.3E

[0108] The calculation yields: S = 1.2 × 0.15 + 1.4 × 1.11 + 1.3 × 0.03 = 0.18 + 1.554 + 0.039 = 1.773 kN / ㎡ (take 1.77 kN / ㎡).

[0109] The above loads and combinations are applied to the digital twin model to complete the model initialization.

[0110] Step S2: Solve for the optimal keel support system layout using topology optimization.

[0111] S21. Optimize parameter settings. Based on HyperWorks software, adopt the variable density topology optimization algorithm: Design variables: material density distribution in the keel area (01, 0 is no material, 1 is full material), constraints: ① Maximum overall displacement ≤ L / 250 (L is the curtain wall height 8m, i.e. ≤32mm); ② Maximum stress of the keel ≤ [σ]=160MPa, objective function: minimize the keel volume (lightweight, reduce cost), mesh generation: use tetrahedral elements, element size 50mm, total number of elements 12000, number of nodes 8500.

[0112] S22. Optimization Solution and Result Verification

[0113] Iterative calculation: Set the number of iterations to 50 and the convergence accuracy to 1e3. The optimal distribution cloud map of the keel material is obtained by solving the problem using software.

[0114] Optimal layout extraction: The longitudinal beams are arranged non-orthogonally (120° angle in the arc area) with a spacing of 1.8m; the transverse beams are arranged orthogonally with a spacing of 1.5m; the cross-sectional dimensions of the keel are: longitudinal beam 120×60×3mm, transverse beam 100×50×2.5mm.

[0115] Constraint verification (finite element analysis): Overall maximum displacement: 18.5mm≤32mm (satisfies stiffness constraint), maximum stress of keel: 132MPa≤160MPa (satisfies strength constraint), keel volume: reduced by 22% after optimization compared to the initial scheme (uniform arrangement) (satisfies lightweight target).

[0116] Step S3: Optimize the network layout of connection points

[0117] A typical irregularly shaped stone honeycomb composite panel (number A01) in the middle area of ​​the curtain wall was selected as the analysis object. The panel size is 2.4m long × 1.8m wide, and the area is S = 4.32㎡. The adjacent panel is A02 (size 2.4m × 1.5m).

[0118] 31. Determination of Constraint Parameters

[0119] The ultimate bearing capacity of the connection point is F=8kN, as specified in claims 2 and 3:

[0120] Rated load capacity range: Lower limit F = 8 × 60% = 4.8 kN, Upper limit F = 8 × 80% = 6.4 kN

[0121] High-efficiency section: F = 6.4 × 85% = 5.44 kN, F = 6.4 kN

[0122] Optimization objective function: min(total number of connection points N + variance of bearing capacity of all connection points σ²) (Claim 7)

[0123] S32, Calculate the total support reaction force of the plate.

[0124] Total support reaction force R = load combination value × plate area = 1.77 × 4.32 ≈ 7.65 kN (equilibrium condition: support reaction force = total load borne by the plate)

[0125] S33, Preliminary Allocation of Dedicated Connection Points

[0126] 1. The design load for a single dedicated connection point must be located in the high-efficiency section (5.44-6.4 kN).

[0127] 2. Calculation of the number of dedicated connection points: N≥R / F=7.65 / 6.4≈1.195, take N=2;

[0128] 3. Load distribution: The load is evenly distributed between the two dedicated connection points, with each load F = 7.65 / 2 ≈ 3.825 kN (this does not meet the requirements for high-efficiency sections and needs adjustment).

[0129] 4. Adjustment and optimization: Add 1 dedicated connection point (N=3), each load F=7.65 / 3≈2.55kN (still not satisfactory, needs to be optimized in conjunction with shared connection points);

[0130] 5. Final preliminary allocation: 2 dedicated connection points (6.0kN / point, located in the high-efficiency section) + 1 reserved common connection point (bearing the remaining load of 1.65kN). At this time, N=2, and the loads all meet the requirements of the high-efficiency section.

[0131] S34. Layout of shared connection points

[0132] 1. Boundary area identification: The adjacent boundary length between board A01 and A02 is 0.8m (arc-shaped overlapping area), and the common connection points can be laid out.

[0133] 2. Finite element analysis: ANSYS software;

[0134] Mesh generation: Shell units are used for the sheet metal with a unit size of 20mm, and solid units are used for the connectors with a unit size of 10mm.

[0135] Load application: Apply uniformly distributed loads according to load combinations to constrain keel displacement;

[0136] The location of the shared connection point is determined as follows: 0.4m from the edge of A01 and 0.3m from the edge of A02 (coordinates X=3.6m, Y=2.4m, Z=0m).

[0137] 3. Force verification and preset equilibrium conditions:

[0138] The total supporting reaction force of the A02 plate is R = 1.77 × (2.4 × 1.5) ≈ 6.37 kN, and the component force distributed to the common connection point is F = 4.0 kN;

[0139] The component force A01 is distributed to the common connection point is F = 1.65kN (after adjustment), and the resultant force is F = 1.65 + 4.0 = 5.65kN;

[0140] Balance verification: F / R=1.65 / 7.65≈0.216, F / R=4.0 / 6.37≈0.628. After coordinating and adjusting the load of the A01 dedicated connection point (adjusted to 5.8kN / point, total load 11.6kN, with a reserved shared component force of 3.95kN, i.e., bearing part of the load of A02), the final component force ratio F:F=3.0:2.8≈1.07:1 (close to the total reaction force ratio of the two plates 7.65:6.37≈1.2:1). The component force direction is along the axis of the connector, and the node is in the optimal stress state of tension-compression balance.

[0141] Bearing capacity verification: F = 5.8kN (3.0 + 2.8), which is within the rated bearing capacity range (4.8-6.4kN), and meets the constraints.

[0142] 4. Final layout of connection points: 2 dedicated connection points for A01 plate + 1 shared connection point (shared with A02), total connection points N=3, bearing capacity variance σ²=0.04 (satisfying the objective function minimization).

[0143] Step S4: Simulation of installation sequence and iterative adjustment of connection point parameters

[0144] S4.1 Installation sequence planning: constrained by construction feasibility;

[0145] Planning sequence: Starting from the lower left corner of the curtain wall, following the principle of "from bottom to top and from left to right", prioritize the installation of corner panels (C01, C02), then install the panels in the middle area (A01, A02, A03...), and finally install the top panels (T01, T02).

[0146] S4.2 Dynamic Load Analysis and Iterative Adjustment: Simulation was performed using MidasGen software;

[0147] The first three steps of the installation process were selected for analysis, and the real-time load at the connection points was recorded:

[0148] Step 1: Install C01 board (no adjacent boards), 3 dedicated connection points, with real-time loads of 5.9kN, 6.1kN and 6.0kN respectively (all within the rated range, no abnormalities).

[0149] Step 2: Install plate A01 (no shared connection point with C01), 2 dedicated connection points (5.8kN / each), 1 shared connection point (not yet under load), and the real-time loads all meet the requirements;

[0150] Step 3: Install the A02 board (which shares one connection point with A01). At this point, the real-time load of the shared connection point of A01 increases to 5.8kN (3.0+2.8). There are two dedicated connection points for A02 (loads of 5.2kN and 5.3kN), both within the rated range. However, the load of one of the dedicated connection points of A01 increases to 6.5kN (exceeding the upper limit of 6.4kN), requiring iterative adjustment.

[0151] Iterative adjustment scheme: The load of the dedicated connection point A01 is redistributed to 5.7kN and 5.7kN, while the load of the shared connection point remains at 5.8kN. After the adjustment, the real-time loads of all connection points (5.7, 5.7, 5.8, 5.2, and 5.3kN) are all within the range of 4.8kN to 6.4kN.

[0152] S4.3 Generate installation process cards: Record the installation time, board number, real-time load of connection points, and adjustment parameters for each step to form a traceable construction guidance document.

[0153] Step S5: Generate CNC machining and positioning files

[0154] S5.1, CNC machining coordinate files, generated based on CAD / CAM software

[0155] Taking A01 board as an example, the coordinates of the connection point are as follows: with the bottom left corner of the board as the origin, the X-axis is along the length direction, and the Y-axis is along the width direction:

[0156] Dedicated connection point 1: (0.6m, 0.6m, 0m), digital identifier ID: ZLA01001, associated parameters: design load 5.7kN, plate material A01, no adjacent dependencies;

[0157] Dedicated connection point 2: (1.8m, 0.6m, 0m), digital identifier ID: ZLA01002, associated parameters: design load 5.7kN, belonging to plate A01, no adjacent dependency;

[0158] Shared connection point: (2.1m, 1.2m, 0m), digital identifier ID: GYA01A02001, associated parameter: design load 5.8kN, belonging to plate A01 / A02, dependency relationship A01 is installed first.

[0159] S5.2, Keel Positioning File

[0160] Based on the digital twin model, the three-dimensional positioning coordinates of the keel are output (with the lower left corner of the curtain wall as the reference point). The positioning error of the longitudinal beam is ≤ ±1mm, and the positioning error of the transverse beam is ≤ ±1mm. Example:

[0161] Longitudinal beam 1: (non-orthogonal, angle 120°): starting point (0m, 0m, 0m), ending point (0m, 8m, 0m).

[0162] Crossbeam 2: Start point (1.8m, 0m, 0m), End point (1.8m, 8m, 0m).

[0163] Step S6: Prefabrication of panels and installation of on-site joists

[0164] S6.1 Prefabrication of Panels

[0165] Based on the CNC machining coordinate file, a CNC machine tool is used to pre-drill holes (12mm diameter, 20mm depth, matching the connector) on the A01 plate, and 304 stainless steel connectors are pre-embedded. The hole position error is ≤±0.5mm, and the pre-embedded verticality error is ≤0.5°.

[0166] S6.2 On-site keel installation

[0167] According to the keel positioning document, a laser positioning device was used for keel installation. First, the longitudinal beams were installed (adjusting the non-orthogonal angle to 120°), then the transverse beams were installed. After installation, the following checks were performed:

[0168] Keel spacing: longitudinal beam 1.8m (error +0.8mm), cross beam 1.5m (error 0.5mm);

[0169] Keel verticality: ≤2mm / 8m (meets specifications);

[0170] Keel stress: No initial stress after installation (test value ≤ 5MPa).

[0171] Step S7: On-site construction guidance

[0172] 1. Construction workers wear HoloLens 2 augmented reality devices and scan the digital identifiers (in QR code form) at the connection points.

[0173] 2. The equipment provides a 3D positioning model of the connection point, installation sequence guidance, load parameter reminders, and real-time display of installation deviations (such as issuing an alarm when the pre-embedded deviation of the connector exceeds 0.5mm).

[0174] 3. After installation, the equipment records the actual installation coordinates, compares them with the design coordinates, and generates a construction acceptance report (the deviation is ≤1mm, which meets the accuracy requirements).

[0175] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A connection structure based on honeycomb composite panels made of building stone, characterized in that... ,include: The base body (1) has a cylindrical structure of revolution; The threaded sleeve (2) has a rotating cylindrical structure and is detachably connected to the base body (1); The ball head screw (3) is oriented in an adjustable manner within the threaded sleeve (2); A locking nut (4) is provided inside the threaded sleeve (2) and abuts against the ball head screw (3); The transverse keel is detachably connected to the ball head screw (3); The longitudinal keel is detachably connected to the transverse keel; The composite plate is fixedly connected to the base body (1).

2. The connection structure based on building stone honeycomb composite panels according to claim 1, characterized in that: One end of the base body (1) is provided with a stepped hole (12). The section of the stepped hole (12) near the end face of the base body (1) is provided with an internal thread. The section of the stepped hole (12) away from the end face of the base body (1) is an optical axis. The circumferential surface of the base body (1) near the other end face is provided with annular inverted teeth (11). The annular inverted teeth (11) are inserted into the honeycomb of the composite board and engaged, and the end face of the base body (1) is bonded to the stone.

3. The connection structure based on building stone honeycomb composite panels according to claim 2, characterized in that: The outer periphery of the threaded sleeve (2) is provided with an external thread that matches the stepped hole (12), and the circumferential surface of the non-extending end of the threaded sleeve (2) is provided with a radially outward flange.

4. A connection structure based on a honeycomb composite panel for building stone as described in claim 2, characterized in that: The annular inverted teeth are inclined inverted tooth structures with triangular cross-sections arranged at uniform intervals.

5. A connection structure based on a honeycomb composite panel for building stone as described in claim 3, characterized in that: The threaded sleeve (2) has an internal thread section on its inner circumferential surface at the end away from the flange, which is connected to the locking nut (4). The threaded sleeve (2) has a spherical groove (21) in the middle for accommodating the ball head screw (3). The threaded sleeve (2) has a chamfer on its edge near the flange.

6. The connection structure based on building stone honeycomb composite panels according to claim 3, characterized in that: The flange and the end face of the base body (1) are spaced apart.

7. The connection structure based on building stone honeycomb composite panels according to claim 1, characterized in that: The ball head screw (3) includes a ball head (31) and a screw part (32), and the ball head (31) and the screw part (32) are connected by a journal.

8. A connection structure based on a honeycomb composite panel for building stone as described in claim 1, characterized in that: The locking nut (4) is an embedded nut with external threads on its outer circumference, and the locking nut (4) has a concave part (41) on the side near the ball head screw (3).

9. A connection system for stone honeycomb composite panel curtain walls, characterized in that, Includes the following steps: S1: Establish a digital twin building information model that includes all curtain wall panels, allowable keel layout space, and connection structure mechanical parameters, and apply design loads; S2: Based on the topology optimization algorithm, solve the optimal keel support system layout that satisfies the overall stiffness and strength constraints within the allowed space. The layout includes non-orthogonal longitudinal beams and transverse beams. S3: Under the optimal keel layout, with the goal of maximizing the load-bearing ratio of the connection structure and reducing the total number of connection points, the connection point network is optimized. This optimization includes: S31: For each plate, calculate the total support reaction force required under the design load; S32: Based on the rated load-bearing capacity range of the single-point connection structure, the necessary number of dedicated connection points are initially allocated to the plate, and the design load of each dedicated connection point is located in the high-efficiency segment of the rated load-bearing capacity range; S33: Identify the boundary area where adjacent plates can share the load, and arrange at least one common connection point for at least one pair of adjacent plates; the location of the common connection point is determined by finite element analysis, so that under the design load, the resultant force from each adjacent plate satisfies the preset equilibrium condition, and its total load is within the rated bearing capacity range. S4: Simulate the installation sequence of the curtain wall, dynamically analyze the impact of each installation step on the load of the installed nodes, iteratively adjust the layout of the connection points and load distribution in S3, and ensure that the real-time load of all connection points does not exceed their rated bearing capacity range throughout the entire process from the installation of the first panel to the completion of the installation of the last panel. S5: Based on the final optimized keel layout and connection point network layout scheme, generate the CNC machining coordinate file of the back connection point of each board and the corresponding keel positioning file; S6: Based on the CNC machining coordinate file, precisely pre-drill holes and embed them in each board; based on the keel positioning file, install the optimized keel system on site.

10. A connection structure based on a honeycomb composite panel for building stone as described in claim 9, characterized in that: The objective function for optimizing the connection point network layout in step S3 is to minimize the sum of the total number of connection points and the variance of the bearing capacity of all connection points, while satisfying all structural constraints.

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