Special-shaped suspended ceiling multi-stage conversion layer construction method based on truss structure system

Abstract

The invention discloses a special-shaped suspended ceiling multistage conversion layer construction method based on a truss structure system. The method comprises the following steps: firstly, establishing a BIM model, collecting truss node coordinates, and calculating and determining the deviation between a design point and an actual measurement point based on a geometric error; a first-layer main keel fixed through a steel hoop is installed on an upper chord of the truss, and a reverse pulling angle is determined through a stress optimization algorithm to control deflection; sequentially hanging a second conversion layer and a third conversion layer downwards through a vertical suspender, and checking the stability of the super-long suspender by adopting a slenderness ratio judgment and spacing optimization function; triangular stabilizing units are arranged in a dome and a light-transmitting film area, and safety is calculated and verified through a stability coefficient; in the surface layer construction stage, a matching algorithm is used for optimizing the relation between electromechanical hole positions and keel grids, and secondary trepanning is avoided; and after completion, an adjustment amount is generated by adopting an error correction algorithm according to measured data, and the component section specification is determined by combining a material type selection optimization function. According to the method, error control and stress optimization in the whole ceiling construction process are achieved.

Description

Technical Field

[0001] This invention relates to the field of ceiling construction technology, and more specifically, to a construction method for multi-level transition layers of irregular ceilings based on a truss structure system. Background Technology

[0002] With the continuous development of modern architecture, especially large public buildings, transportation hubs, convention centers, and commercial complexes, the design of ceilings in building interior spaces is no longer limited to meeting the needs of concealing pipelines and basic decoration. Instead, it is gradually developing towards large spans, large spaces, complex curved surfaces, and artistic shapes. Irregularly shaped ceilings, due to their diverse shapes, rich layers, and strong sense of space, are widely used in places such as airport waiting halls, theater lobbies, shopping malls, and exhibition halls. These types of ceilings often require multi-level transfer layer construction within a truss structure system to achieve the organic integration of complex shapes and electromechanical systems.

[0003] However, most existing ceiling construction methods still rely on conventional keel hanging or simple steel frame assembly, depending on manual layout and on-site experience. This approach has significant shortcomings when applied to large-span and irregularly shaped ceilings: First, due to the complex geometry of the ceiling space, traditional layout methods cannot guarantee accuracy, easily leading to the accumulation of spatial errors between multiple transition layers, resulting in excessive deviations in surface layer installation; second, in terms of the load-bearing system, traditional keel construction methods often fail to reasonably distribute the load, and the main keel is prone to excessive deflection or even instability in the mid-span, especially when the vertical hangers are long, making stability difficult to guarantee; third, due to the complex stress path in the dome and translucent membrane areas, unreasonable node construction often leads to hidden dangers such as local cracking and subsidence, and existing methods lack targeted stability analysis and optimization design, making it difficult to guarantee safety.

[0004] Furthermore, existing construction methods generally lack digital and intelligent support. Due to the absence of systematic algorithmic judgment and error correction mechanisms, the coordination of node adjustments and electromechanical pre-reserved hole positions during construction often relies on experience, leading to frequent on-site secondary drilling or reinforcement, increasing construction time and costs. Simultaneously, in material selection, existing methods often employ empirical configurations, lacking scientific optimization calculations, which can easily result in over-design or insufficient load-bearing capacity. In conclusion, existing technologies are insufficient to meet the comprehensive requirements of modern irregular-shaped ceilings for high-precision construction, high safety, and high efficiency.

[0005] Therefore, we urgently need to design a construction method for multi-level transition layers of irregular ceilings based on a truss structure system to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the technical problems mentioned in the background section, and to provide a construction method for multi-level transfer layers of irregular ceilings based on a truss structure system, including the following steps:

[0007] S1: Establish a ceiling space parameter model, collect the three-dimensional coordinates of truss nodes, and calculate the geometric error between the ceiling design point and the truss node based on the algorithm;

[0008] S2: Install steel clamps on the upper chord of the truss, and determine the cross-sectional specifications and installation position of the main keel of the first transfer layer based on the geometric error calculation results;

[0009] S3: A reverse tie member is set in the middle of the first transition layer. Its angle and anchor point are determined by the stress optimization algorithm to control the deflection of the main keel.

[0010] S4: The second and third transition layers are suspended by vertical hangers. The free length of the hangers is calculated by a stability judgment algorithm. When the length exceeds the threshold, horizontal and vertical tie rods are added at the corresponding positions.

[0011] S5: Install the surface keel under the third conversion layer, and combine it with the electromechanical hole positions to correct the matching relationship between the keel mesh and the hole positions based on the integrated layout algorithm;

[0012] S6: After construction is completed, the measured data is compared with the model, the node adjustment amount is calculated based on the error correction algorithm, and the final correction is completed through adjustable parts. According to the construction needs of different areas, including the strip area and the dome light-transmitting membrane area, the ceiling installation is completed by adopting the corresponding connection method and component arrangement.

[0013] As a preferred technical solution of the present invention, the specific construction parameters for the strip area include:

[0014] The main keel of the first transition layer uses 120×60×5 mm hot-dip galvanized rectangular steel pipe, and is fixed to the upper chord of the truss by 80 mm wide × 6 mm thick steel clamps.

[0015] The first layer of secondary keel uses 50×50×5 mm hot-dip galvanized angle steel based on the construction method of multi-level conversion layer of irregular ceiling under truss structure system;

[0016] The second layer of main and secondary keels both use 50×50×5 mm hot-dip galvanized angle steel based on the construction method of multi-level conversion layer of irregular ceiling under truss structure system;

[0017] The third-layer transition layer keel uses 100×50×3 mm hot-dip galvanized rectangular steel pipes based on the construction method of multi-level transition layer of irregular ceiling under truss structure system.

[0018] The main keel of the surface layer uses 80×40×2.5 mm galvanized C-shaped steel based on the construction method of multi-level transfer layer of irregular ceiling under truss structure system, and the secondary keel uses 40×20×1.2 mm galvanized C-shaped steel based on the construction method of multi-level transfer layer of irregular ceiling under truss structure system.

[0019] As a preferred technical solution of the present invention, in step S3, the reverse tie member adopts L70×6 mm hot-dip galvanized angle steel based on the construction method of multi-level conversion layer of irregular ceiling under truss structure system. The stress optimization algorithm takes the mid-span deflection of the main keel and the reaction force of the truss node as input variables and outputs the arrangement angle of the tie member. The angle range is 30°~60°.

[0020] As a preferred technical solution of the present invention, the stability determination algorithm of the hanger in step S4 takes the free length of the hanger, the moment of inertia of the section and the design load as input, calculates the slenderness ratio and compares it with a threshold. When the free length is greater than 3.8m, a reinforcement arrangement scheme for the horizontal and vertical tie rods is generated. The tie rods are made of 50×50×5mm hot-dip galvanized angle steel, and the arrangement spacing is 1000~1500mm.

[0021] As a preferred technical solution of the present invention, the steel clamp in step S2 is a multi-piece combination type with a thickness of not less than 6 mm, and anti-slip pads are provided on the contact surface with the truss; the bolts used are 8.8 grade high-strength bolts, and spring washers and anti-loosening adhesive are configured to achieve disassembly and re-tightening.

[0022] As a preferred technical solution of the present invention, the specific construction parameters of the dome and the translucent membrane area include:

[0023] The construction method of multi-level transfer layer of irregular ceiling based on truss structure system adopts mm width × 8 mm thickness galvanized clamps to connect with the low truss.

[0024] Using L70×6 galvanized angle steel as vertical hangers, and 60×80×5 galvanized square steel unit frames are suspended below.

[0025] Each unit frame is equipped with two L70×6 mm galvanized angle steel diagonal braces to form a triangular stable unit.

[0026] The unit frame and the 50×50×3 mm galvanized square steel form a secondary frame, and the 40×40×3 mm galvanized square steel secondary keel is connected by φ12 through threaded rods.

[0027] The membrane structure support frame is welded or riveted to the aluminum plate sub-keel, and a sliding and tensioning device is provided to absorb temperature deformation.

[0028] As a preferred technical solution of the present invention, the integrated layout algorithm described in step S5 takes the coordinates of the holes of the electromechanical equipment and the coordinates of the keel grid as input, calculates the optimal matching relationship between the two, and outputs the hole reinforcement layout diagram to avoid secondary drilling.

[0029] As a preferred technical solution of the present invention, the error correction algorithm in step S6 includes: collecting measured data of elevation, flatness, and radius of curvature, calculating the difference with the design value, and outputting the adjustment amount of the adjustable hanger; after adjustment, the deviation control range is: elevation ±5 mm, flatness ≤5 mm, radius of curvature ±5 mm, and joint width ±2 mm.

[0030] As a preferred technical solution of the present invention, the material selection algorithm combines load conditions, span and fire resistance rating to output the cross-sectional range of the main keel, secondary keel and hanger. All steel components are hot-dip galvanized for corrosion protection, and the galvanizing layer grade is not lower than Z275. If necessary, fireproof coating is applied to ensure the fire resistance performance of the ceiling system.

[0031] As a preferred technical solution of the present invention, the method is based on BIM model and algorithm calculation to form full-process construction control. It can generate the optimal layout scheme of clamps, keel, hangers, diagonal braces and surface keel through simulation calculation before construction, and dynamically correct it in combination with measured data during construction.

[0032] Beneficial effects:

[0033] First, this invention introduces a geometric error calculation algorithm based on BIM models and measured data. This algorithm can quickly obtain the spatial deviation between truss nodes and design points before construction. A complete formula chain is then constructed using stress optimization formulas, stability judgment formulas, and matching deviation calculation formulas, enabling full-process control from positioning to correction. Compared to traditional methods relying on experience-based layout and manual correction, this method significantly improves the geometric accuracy of ceiling construction, ensures high consistency between multi-level transition layers and complex irregular curved surfaces, reduces rework, and saves construction time.

[0034] Secondly, in terms of structural stress, this invention effectively disperses and counteracts mid-span deflection by setting reverse tie members in the middle of the main keel span and combining them with a stress optimization algorithm. When vertical hangers are excessively long, the stability assessment algorithm automatically identifies excessive slenderness ratios and generates a horizontal and vertical tie rod arrangement scheme, thus avoiding the "construction first, remediation later" problem of traditional methods. Particularly in the dome and translucent membrane areas, the use of triangular element stability coefficients ensures the stability of the node system under complex spatial curved surfaces, improving overall load-bearing capacity and reducing the risk of structural instability, significantly enhancing the safety and reliability of the ceiling during long-term use.

[0035] Furthermore, this invention offers advantages in functional coordination and construction integration. Through an integrated layout algorithm, the positions of electromechanical equipment holes are optimally matched with the ceiling keel grid, avoiding secondary drilling that could damage the framework and ensuring the synchronous implementation of the electromechanical system and the ceiling project. The error correction algorithm automatically generates adjustment amounts based on feedback from measured elevation and flatness data, and, combined with adjustable points, performs rapid on-site corrections, ensuring that the finished ceiling fully meets design requirements in terms of elevation, flatness, and radius of curvature. Simultaneously, the material selection optimization function proposed in this invention can achieve optimal selection of component specifications while meeting load and fire resistance requirements, reducing material costs and improving durability. In summary, this method achieves digitalization, refinement, and intelligence throughout the entire construction process, combining high precision, high safety, and high economy, and has strong potential for widespread application. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart of a construction method for a multi-level transfer layer of irregular ceiling based on a truss structure system;

[0038] Figure 2 Partial view of the ceiling construction drawings;

[0039] Figure 3 : A partial view of the first layer of main keel in the ceiling construction drawings. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided in conjunction with embodiments and appendices. Figure 1-3The present invention will be further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0041] See Figure 1-3 This invention provides a construction method for multi-level transition layers of irregularly shaped suspended ceilings based on a truss structure system. In actual construction, a three-dimensional parametric model of the suspended ceiling space needs to be established after the main structure is completed. This model is constructed using BIM software and can comprehensively reflect the spatial curvature of the suspended ceiling, the location of truss nodes, and the reserved space for electromechanical openings.

[0042] During the construction preparation phase, laser scanners or total stations are used to measure the key nodes of the truss structure, obtaining the actual three-dimensional coordinate values ​​(x, y, z). si ,y si ,z si ), and compared with the design coordinate values ​​(x d i,y di ,z di Compare these figures and calculate the geometric deviation Δ of each control point. i The calculation formula is as follows:

[0043]

[0044] Where, Δ i x represents the spatial deviation of the i-th control point. si ,y si ,z si Represents the measured coordinate value, x d i,y di ,z di This represents the design coordinate values. The overall deviation can be obtained by taking a weighted average of the deviations at all points. when Within permissible limits (usually no more than 10mm), the construction method for multi-level transition layers in irregular-shaped suspended ceilings based on a truss structure system can proceed to the next step. If the limit is exceeded, corrections must be made at the truss arrangement points to ensure the accuracy of the ceiling frame layout. After error verification, the installation of the main keel of the first transition layer begins.

[0045] participate Figure 2-3In this embodiment, the first layer of main keel uses 120×60×5mm hot-dip galvanized rectangular steel pipes, which are fixed to the upper chord of the truss using steel clamps that are 80mm wide and 6mm thick. The clamps are composed of multiple pieces and are connected with 8.8 grade high-strength bolts. Anti-slip pads are added to the contact surfaces to ensure reliable force transmission. To prevent excessive deflection of the main keel in the middle of the span, a L70×6mm hot-dip galvanized angle steel is installed at the mid-span as a reverse tie. This angle steel is anchored upwards to the truss node, and its angle θ is determined by the stress optimization formula.

[0046]

[0047] Where θ is the installation angle of the angle steel, M is the maximum bending moment borne by the main keel at mid-span, R is the reaction force provided by the truss node, and l is the span length of the main keel. This calculation yields a reasonable installation angle range (generally between 30° and 60°), ensuring that the deflection of the main keel is controlled within l / 300, thereby preventing ceiling sagging or cracking. Construction method for multi-level transfer layers of irregular ceilings based on truss structure system.

[0048] After the first layer of main keel is installed, the second and third transition layers are installed sequentially via vertical hangers. The hangers are 50×50×5mm hot-dip galvanized angle steel, and their length is determined based on the ceiling elevation. When the free length L of the hanger exceeds 3.8m, its stability needs to be assessed. The stability assessment is based on the slenderness ratio formula:

[0049]

[0050] Where λ is the slenderness ratio of the boom, and L is the free length of the boom. Let be the radius of gyration of the cross section, I be the moment of inertia of the cross section, and A be the area of ​​the cross section. If the calculated result is greater than the limit λ... lim Therefore, it is necessary to add transverse and longitudinal tie rods to form a stable system. The specific spacing of the tie rods is calculated using an optimization function:

[0051]

[0052] Among them, Sopt For the optimal tie rod spacing, u j Let u be the displacement of the j-th boom under force. r ef represents the allowable target displacement limit, and n represents the number of hangers. This is based on a construction method for multi-level transfer layers in irregularly shaped suspended ceilings under a truss structure system. Through iterative optimization, the arrangement scheme that minimizes the overall displacement deviation is obtained, ensuring the overall stability of the suspended ceiling. This method is based on a construction method for multi-level transfer layers in irregularly shaped suspended ceilings under a truss structure system.

[0053] In the dome and translucent membrane areas, to meet the requirements of shape and stress, 80mm wide and 8mm thick steel clamps are used to connect to the low-level truss, employing a multi-level transition layer construction method based on a truss structure system. Vertical suspension rods utilize L70×6mm galvanized angle steel, with 60×80×5mm galvanized square steel unit frames suspended below. Within each unit frame, two L70×6mm angle steel diagonal braces are arranged to form a triangular stable unit. The formula for calculating its stability index is:

[0054]

[0055] Among them, K t Let ∑P be the trigonometric stability coefficient. c Let ∑P be the total bearing capacity of the components. t This represents the sum of external loads. When K t A value ≥1.2 indicates sufficient stability of the unit system. The translucent membrane structure is connected to the aluminum plate sub-keel by welding or riveting, and tension grooves are installed to absorb temperature effects and prevent wrinkling or tearing of the membrane surface. Construction method for multi-level transition layers of irregular ceilings based on truss structure system.

[0056] During the surface layer keel construction stage, main and secondary keels are installed below the third transfer layer. The main keel uses 80×40×2.5mm galvanized steel profiles (based on a truss structure system for multi-level transfer layers of irregular ceilings). The secondary keel uses 40×20×1.2mm steel profiles (based on a truss structure system for multi-level transfer layers of irregular ceilings). To ensure accurate matching between the electromechanical hole positions and the keel grid, a minimum distance matching algorithm is used for optimization.

[0057]

[0058] Where D is the matching deviation, (x gk ,y gk ) represents the node coordinates of the keel mesh, (x ek ,y ek ( ) represents the coordinates of the electromechanical hole positions, and m represents the number of hole positions. The construction method for multi-level transfer layers of irregular-shaped ceilings based on a truss structure system uses an algorithm to obtain the optimal reinforcement layout scheme, ensuring that the electromechanical equipment and ceiling installation are completed simultaneously, avoiding secondary drilling. After the construction of the multi-level transfer layer construction method for irregular-shaped ceilings based on a truss structure system is completed, the entire ceiling is measured to obtain parameters such as elevation, flatness, and radius of curvature, and an error correction algorithm is used for adjustment. The adjustment calculation formula is:

[0059] Δh=h s -h d

[0060] Where Δh is the node adjustment amount, h s h is the measured elevation. d The design elevation is defined as follows: When |Δh|>5 mm, the adjustable brackets are used for adjustment until the design requirements are met.

[0061] Regarding material selection, the component cross-section is optimized using an objective function:

[0062] F=α·q+β·l-γ·R n

[0063] Where F is the optimization objective function, q is the load per unit area, l is the span, and R is the load per unit area. nα, β, and γ represent the load-bearing capacity of the components, and α, β, and γ are weighting coefficients. By comparing the calculation results of different sections, the section specifications that meet both load-bearing requirements and economic considerations are selected. All steel components are hot-dip galvanized. The galvanized layer is not lower than the grade of Z275, a construction method for multi-level transfer layers of irregular suspended ceilings based on truss structure systems. Fire-retardant coatings are applied to the surface when necessary to improve fire resistance.

[0064] In summary, the construction method of this invention forms a complete formula chain: first, Δ is calculated through geometric deviation. i The positioning reference is obtained, and then the reverse tie angle θ is solved using the force optimization formula. Subsequently, the stability of the hanger is determined by the slenderness ratio λ, and the tie rod spacing S is determined based on the optimization function. opt Further calculation of the triangular stability coefficient K in the dome region. t Then, during the surface layer construction, the matching deviation D is used to optimize the relationship between the hole position and the keel. Finally, the node adjustment amount Δh is used for fine finishing, and the optimal cross-sectional specifications are determined by combining the material selection function F.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, 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 construction method for multi-level transfer layers of irregularly shaped suspended ceilings based on a truss structure system, characterized in that, Includes the following steps: S1: Establish a ceiling space parameter model, collect the three-dimensional coordinates of truss nodes, and calculate the geometric error between the ceiling design point and the truss node based on the algorithm; S2: Install steel clamps on the upper chord of the truss, and determine the cross-sectional specifications and installation position of the main keel of the first transfer layer based on the geometric error calculation results; S3: A reverse tie member is set in the middle of the first transition layer. Its angle and anchor point are determined by the stress optimization algorithm to control the deflection of the main keel. S4: The second and third transition layers are suspended by vertical hangers. The free length of the hangers is calculated by a stability judgment algorithm. When the length exceeds the threshold, horizontal and vertical tie rods are added at the corresponding positions. S5: Install the surface keel under the third conversion layer, and combine it with the electromechanical hole positions to correct the matching relationship between the keel mesh and the hole positions based on the integrated layout algorithm; S6: After construction is completed, the measured data is compared with the model, the node adjustment amount is calculated based on the error correction algorithm, and the final correction is completed through adjustable parts. According to the construction needs of different areas, including the strip area and the dome light-transmitting membrane area, the ceiling installation is completed by adopting the corresponding connection method and component arrangement.

2. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, The specific construction parameters for the panel area include: The main keel of the first transition layer uses 120×60×5 mm hot-dip galvanized rectangular steel pipe, and is fixed to the upper chord of the truss by 80 mm wide × 6 mm thick steel clamps. The first layer of secondary keel uses 50×50×5 mm hot-dip galvanized angle steel based on the construction method of multi-level conversion layer of irregular ceiling under truss structure system; The second layer of main and secondary keels both use 50×50×5 mm hot-dip galvanized angle steel based on the construction method of multi-level conversion layer of irregular ceiling under truss structure system; The third-layer transition layer keel uses 100×50×3 mm hot-dip galvanized rectangular steel pipes based on the construction method of multi-level transition layer of irregular ceiling under truss structure system. The main keel of the surface layer uses 80×40×2.5 mm galvanized C-shaped steel based on the construction method of multi-level transfer layer of irregular ceiling under truss structure system, and the secondary keel uses 40×20×1.2 mm galvanized C-shaped steel based on the construction method of multi-level transfer layer of irregular ceiling under truss structure system.

3. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, In step S3, the reverse tie member adopts L70×6 mm hot-dip galvanized angle steel based on the construction method of multi-level conversion layer of irregular ceiling under truss structure system. The stress optimization algorithm takes the mid-span deflection of the main keel and the reaction force of the truss node as input variables and outputs the arrangement angle of the tie member. The angle range is 30°~60°.

4. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, The stability determination algorithm for the hanger described in step S4 takes the free length, moment of inertia of the section, and design load of the hanger as input, calculates the slenderness ratio and compares it with a threshold. When the free length is greater than 3.8 m, a reinforcement arrangement scheme for the horizontal and vertical tie rods is generated. The tie rods are made of 50×50×5 mm hot-dip galvanized angle steel, and the arrangement spacing is 1000~1500 mm.

5. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, The steel clamps mentioned in step S2 are multi-piece composites with a thickness of not less than 6 mm, and anti-slip pads are provided on the contact surface with the truss. The bolts used are 8.8 grade high-strength bolts, and are equipped with spring washers and anti-loosening adhesive to achieve disassembly and re-tightening.

6. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, The specific construction parameters for the dome and translucent membrane area include: The construction method of multi-level transfer layer of irregular ceiling based on truss structure system adopts mm width × 8 mm thickness galvanized clamps to connect with the low truss. Using L70×6 galvanized angle steel as vertical hangers, and 60×80×5 galvanized square steel unit frames are suspended below. Each unit frame is equipped with two L70×6 mm galvanized angle steel diagonal braces to form a triangular stable unit. The unit frame and the 50×50×3 mm galvanized square steel form a secondary frame, and the 40×40×3 mm galvanized square steel secondary keel is connected by φ12 through threaded rods. The membrane structure support frame is welded or riveted to the aluminum plate sub-keel, and a sliding and tensioning device is provided to absorb temperature deformation.

7. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, The integrated layout algorithm described in step S5 takes the coordinates of the holes in the electromechanical equipment and the coordinates of the keel grid as input, calculates the optimal matching relationship between the two, and outputs the layout diagram of the hole reinforcement components to avoid secondary drilling.

8. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, The error correction algorithm described in step S6 includes: collecting measured data of elevation, flatness, and radius of curvature, calculating the difference between the measured data and the design values, and outputting the adjustment amount of the adjustable bracket; after adjustment, the deviation control range is: elevation ±5 mm, flatness ≤5 mm, radius of curvature ±5 mm, and joint width ±2 mm.

9. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, The material selection algorithm combines load conditions, span, and fire resistance rating to output the cross-sectional range of the main keel, secondary keel, and hangers. All steel components are hot-dip galvanized for corrosion protection, with a zinc coating grade of not less than Z275. If necessary, fire-retardant coating is applied externally to ensure the fire resistance performance of the ceiling system.

10. The construction method for multi-level transfer layers of irregular ceilings based on a truss structure system according to claim 1, characterized in that, This method is based on BIM model and algorithm calculation to form full-process construction control. It can generate the optimal layout scheme of clamps, keel, hangers, diagonal braces and surface keel through simulation calculation before construction, and dynamically correct it in combination with measured data during construction.

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