A high-precision installation method for irregular curved curtain wall keel units

Abstract

This invention discloses a high-precision installation method for irregular curved curtain wall keel units, relating to the curtain wall field. First, a digital twin curved surface model of the main structure is reconstructed through 3D scanning. Keel unit processing data is generated based on curvature changes and prefabricated. The keel units are then hoisted into place using multi-point adaptive balancing hoisting fixtures, with a normal depth adjustment mechanism providing stepless adjustment and temporary positioning. Adjacent units are flexibly connected via multi-degree-of-freedom flexible hinge components, releasing spatial internal stress generated during hoisting and assembly. After full-site verification, the adjustment mechanism and hinge components are rigidly welded and locked, completing stress-free installation. This invention combines digital twin reverse modeling, flexible adaptive connection, and rigid welding locking to achieve high-precision "stress-free" installation of double-curved curtain wall keels, effectively eliminating civil engineering and assembly errors, avoiding structural stress accumulation, and simultaneously improving construction efficiency and the long-term safety and reliability of connection nodes.

Description

Technical Field

[0001] This invention relates to the field of curtain walls, specifically a high-precision installation method for irregular curved curtain wall keel units. Background Technology

[0002] With the development of modern architectural art, hyperboloid curtain walls, due to their unique streamlined appearance and complex geometric aesthetics, are widely used in landmark buildings. However, this complex building skin places extremely high demands on construction technology. At present, the installation of hyperboloid curtain wall keel mainly relies on traditional on-site welding technology or early unitized assembly technology.

[0003] Although existing technologies can meet basic building requirements to a certain extent, they still face the following insurmountable technical challenges in practical engineering applications:

[0004] 1. Low measurement and positioning accuracy, making it difficult to adapt to complex curved surfaces:

[0005] The spatial geometry of hyperboloid shapes is extremely complex, and traditional measurement and positioning methods (such as simple total station layout) are insufficient to accurately reproduce the three-dimensional spatial form with continuously changing Gaussian curvature. This leads to the accumulation of errors in the civil engineering structure and curtain wall installation during construction, resulting in a significant deviation between the actual on-site finish and the design model, making it difficult to ensure a smooth transition on the curtain wall surface.

[0006] 2. High internal stress during assembly, posing significant structural safety hazards:

[0007] Traditional construction methods typically employ rigid connections or forced assembly. Because they cannot effectively release the spatial internal forces caused by lifting deformation, temperature changes, and civil engineering errors during installation, the keel joints are often placed in a state of "prestress" under tension or torsion. This destructive internal stress persists for a long time, easily leading to the failure of connection joints under alternating wind loads and severely impacting the fatigue life and safety of the curtain wall structure.

[0008] 3. Low construction efficiency and quality constrained by the environment:

[0009] Current processes largely rely on assembling loose components at height and welding on-site. This not only requires a large number of skilled welders to work at heights, posing significant safety risks, but also makes the welding quality highly susceptible to environmental factors such as weather (wind, rain) and temperature, easily leading to quality defects such as incomplete welds and porosity. Furthermore, the complex procedures for working at heights result in long overall construction cycles and high costs for machinery and labor. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this invention provides a high-precision installation method for irregular curved curtain wall keel units, aiming to solve the technical problems of traditional hyperboloid curtain walls during construction, such as low installation accuracy due to accumulated errors in civil engineering structures, low installation accuracy due to high-altitude assembly of disassembled parts, destructive internal stress caused by forced assembly, and easy failure of connection nodes due to alternating wind load stress.

[0011] To achieve the above objectives, the present invention provides the following technical solution: a high-precision installation method for irregular curved curtain wall keel units, comprising the following steps:

[0012] The three-dimensional spatial point cloud data of the main building structure is obtained, and a digital twin surface model containing an absolute coordinate system is reconstructed based on the three-dimensional spatial point cloud data.

[0013] The curvature variation characteristics of the digital twin surface model are divided into equal grids to generate multiple keel unit processing data with spatial coordinate numbers, and multiple keel units are pre-formed based on the processing data.

[0014] The first keel unit was suspended and hoisted to the predetermined spatial position using a multi-point adaptive balancing hoisting fixture.

[0015] The keel unit is connected to the main building structure through the normal depth adjustment mechanism, and the bidirectional thread mechanism inside the normal depth adjustment mechanism is driven to extend and retract synchronously, so as to steplessly adjust the normal space entry and exit position of the keel unit and perform temporary positioning.

[0016] The next adjacent keel unit is lifted, and the two adjacent keel units are connected by a multi-degree-of-freedom flexible hinge assembly. The arc-surface sliding fit mechanism built into the multi-degree-of-freedom flexible hinge assembly is used to release the spatial internal stress generated by lifting and assembly, so as to absorb the multi-dimensional spatial displacement and angular assembly error between adjacent keel units.

[0017] After the spatial position of the entire keel unit is verified, the normal depth adjustment mechanism and the multi-degree-of-freedom flexible hinge assembly are rigidly welded and locked to transform the flexible connection into an irreversible rigid connection to complete stress-free installation.

[0018] As a preferred method, the method for obtaining three-dimensional spatial point cloud data of the main building structure specifically includes the following steps: a high-precision reference control network with an absolute coordinate system is established in advance at the construction site, and multi-station scanning is performed through a three-dimensional topography acquisition device to filter out noise points, thereby fitting and generating a non-uniform rational B-spline surface model with continuous Gaussian curvature as the digital twin surface model.

[0019] As a preferred method, the method of prefabricating multiple keel units based on the processing data includes the following steps: using CNC continuous bending process to perform anti-distortion forming treatment on tubular profiles, and presetting the springback compensation parameters corresponding to the yield strength of the material in the digital program, and performing full penetration welding and multi-layer anti-corrosion coating curing in the factory environment after forming.

[0020] Preferably, the normal depth adjustment mechanism includes an outer sleeve having a first threaded end and a second threaded end arranged opposite to each other, and a polygonal drive unit disposed in the middle, wherein the first threaded end and the second threaded end are respectively configured as internal threads with opposite directions of rotation, and are fitted with corresponding external threaded connecting rods. In response to the rotational driving force on the polygonal drive unit, the external threaded connecting rods at both ends simultaneously perform linear movements in opposite directions to change the assembly adjustment stroke.

[0021] Preferably, the multi-degree-of-freedom flexible hinge assembly includes a first connecting plate, a second connecting plate, and a first semi-open arc surface tube and a second semi-open arc surface tube respectively fixed to the ends of the two. The outer diameter of the first semi-open arc surface tube matches the inner diameter of the second semi-open arc surface tube. After the two are connected, they form a sleeve-type concentric sliding pair, which allows the adjacent keel units to undergo relative rotation and axial sliding in three-dimensional space.

[0022] Preferably, after performing the temporary positioning step and before the rigid welding locking step, a small displacement margin is maintained between the end of the normal depth adjustment mechanism and the main building structure to prevent the accumulation of errors in the subsequent assembly process.

[0023] Preferably, the step of rigidly welding and locking the normal depth adjustment mechanism and the multi-degree-of-freedom flexible hinge assembly specifically includes: after the spatial angle and misalignment offset are adjusted to the theoretical elevation, a full-circumference fillet weld is locked at the junction of the end of the normal depth adjustment mechanism and the main structure, and continuous plug welding is performed on the overlapping junction area of ​​the first semi-open arc surface tube and the second semi-open arc surface tube of the multi-degree-of-freedom flexible hinge assembly.

[0024] As a preferred method, the method of hoisting the keel unit using multi-point adaptive balancing hoisting fixtures includes the following steps: pre-calculating the eccentric center of gravity coordinates of each independent keel unit based on its digital three-dimensional model, and asymmetrically configuring three or more rigging connection points on the keel unit based on the eccentric center of gravity coordinates to prevent out-of-plane instability and deflection during hoisting.

[0025] Preferably, after the multi-degree-of-freedom flexible hinge assembly is connected, the following steps are also included: obtaining the measured spatial distance data between two adjacent keel units, cutting off the excess part of the connecting rod on site according to the measured spatial distance data and welding it between adjacent nodes to form a stepped closed-loop construction flow operation.

[0026] Preferably, after the rigid welding and locking step is completed, a secondary spatial morphology acquisition is performed. The method for secondary spatial morphology acquisition includes the following steps: performing a secondary three-dimensional scan on the completed fixed keel mesh, extracting the real three-dimensional spatial node data after molding, and using the real three-dimensional spatial node data to generate processing and layout data for the glass surface material to guide the installation of the surface material.

[0027] In summary, the beneficial effects of this invention are:

[0028] 1. Perfect elimination of three-dimensional spatial errors: This invention innovatively introduces a multi-degree-of-freedom flexible hinge component, which forms a "flexible hinge" when assembling adjacent panels, allowing for an angle adjustment of ±5° and a misalignment within 2cm. This design not only breaks the limitations of traditional rigid assembly, but also fundamentally releases the assembly internal forces accumulated by hoisting and civil engineering, achieving true "stress-free installation".

[0029] 2. Large-stroke stepless adjustment and anti-retrograde locking: The normal depth adjustment mechanism, which adopts a double-threaded mechanism with alternating positive and negative directions, provides the nodes with a large stepless adjustment range, greatly reducing the difficulty of on-site construction alignment. At the same time, in conjunction with the final rigid welding lock, it completely eliminates the risk of thread disengagement and micro-vibration failure that may occur under long-term wind load and self-weight alternating stress of the curtain wall, improves the safety of the system throughout its entire life cycle, solves the difficulties in positioning and setting out during the construction of hyperboloid curtain walls, and solves the problems of difficult control of construction quality and accuracy, thereby improving on-site efficiency and accelerating the construction period.

[0030] 3. Cost Reduction and Efficiency Improvement Driven by Digital Twins: This method deeply integrates high-precision 3D mapping, parametric reverse modeling, and on-site mechanical adjustment nodes to form a closed-loop digital construction pipeline. Engineering practice has verified that this method can converge and control the installation accuracy of complex hyperboloids to within 2cm. Compared to traditional high-altitude welding of individual components, it not only eliminates deformation and distortion but also saves more than 20% of the construction period and significantly reduces the overall cost of machinery shifts and high-altitude operations. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall process framework of a high-precision installation method for irregular curved curtain wall keel units according to the present invention;

[0033] Figure 2 This is a schematic diagram of the unit panel structure of a high-precision installation method for irregular curved curtain wall keel units according to the present invention;

[0034] Figure 3 For the present invention Figure 1 A schematic diagram of the keel unit structure for a high-precision installation method of irregular curved curtain wall keel unit;

[0035] Figure 4 For the present invention Figure 1 A cross-sectional view of the keel unit installation in a high-precision installation method for irregular curved curtain wall keel units.

[0036] Figure 5 For the present invention Figure 1 A schematic diagram of the unfolded structure of a multi-degree-of-freedom flexible hinge assembly for a high-precision installation method of irregular curved curtain wall keel unit.

[0037] Figure 6 For the present invention Figure 1 A schematic diagram of a multi-degree-of-freedom flexible hinged combination structure for a high-precision installation method of irregular curved curtain wall keel unit.

[0038] Figure 7 For the present invention Figure 1 A schematic diagram illustrating the connection structure of a high-precision installation method for a type of irregular curved curtain wall keel unit;

[0039] Figure 8 For the present invention Figure 1 A schematic diagram illustrating the hoisting of a high-precision installation method for a type of irregular curved curtain wall keel unit.

[0040] The markings in the attached diagram are described as follows: 1. Outer sleeve; 2. Polygonal drive unit; 3. First connecting plate; 4. Second connecting plate; 5. First semi-open arc surface tube; 6. Second semi-open arc surface tube; 7. Connecting frame. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0042] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0043] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0044] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of at least two elements or the interaction relationship of at least two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Please see Figure 1-8 The present invention provides an embodiment 1: a high-precision installation method for irregular curved curtain wall keel units, used to install prefabricated curtain wall units onto the main building structure. The method specifically includes the following steps executed in logical order:

[0047] Step 1: 3D Topographic Acquisition and Reverse Reconstruction

[0048] A high-precision reference control network with an absolute coordinate system is established in advance at the construction site. Using 3D topography acquisition equipment, such as a 3D laser scanner, multi-station scanning is performed to filter out noise, with the single-station scanning accuracy error controlled within 5mm, to acquire the 3D spatial point cloud data of the main building structure. Subsequently, a digital twin surface model containing the absolute coordinate system is reconstructed based on the 3D spatial point cloud data. Specifically, this model is a fitted and generated non-uniform rational B-spline (NURBS) surface model with continuous Gaussian curvature.

[0049] Step 2: Parametric Segmentation and Pre-forming

[0050] In parametric design software, the curvature variation characteristics of the digital twin surface model are used to perform equal meshing, for example, controlling the standard unit plate size to 4.6m × 5.1m, generating multiple keel unit processing data with spatial coordinate numbers, and prefabricating multiple keel units based on the processing data, referencing... Figure 2 A standard unit panel consists of six fixed nodes (circled in red) and four splicing nodes (circled in blue). The fixed nodes are directly used to connect the main steel structure, while the splicing nodes are used to splice and fix the unit panels together. During prefabrication, the main keel is preferably made of 80×80×5mm square steel. The tubular profile is subjected to anti-distortion forming treatment using a CNC continuous bending process (such as three-roll bending). The springback compensation parameters corresponding to the yield strength of the material are preset in the digital program. After forming, full penetration welding and multi-layer anti-corrosion coating are carried out in the factory environment, such as three-coat fluorocarbon spraying and curing.

[0051] The fixed nodes use a normal depth adjustment mechanism to connect the keel unit to the main building structure, while the splicing nodes use a multi-degree-of-freedom flexible hinge assembly to connect two adjacent keel units.

[0052] Step 3: Adaptive Balancing Lifting

[0053] The eccentric center of gravity coordinates of each independent keel unit are pre-calculated based on its digital 3D model, and three or more rigging connection points are asymmetrically configured on the keel unit based on these coordinates. Using customized H-type or cross-type multi-point adaptive balancing hoisting fixtures, the first keel unit is suspended and hoisted to a predetermined spatial position, effectively preventing out-of-plane instability and deflection during hoisting.

[0054] Step 4: Normal Depth Adjustment and Temporary Positioning

[0055] On-site construction workers synchronously extend and retract the bidirectional threaded mechanism inside the normal depth adjustment mechanism to steplessly adjust the normal spatial position of the keel unit and perform temporary positioning, with a maximum adjustment range of 10cm. At this time, a small displacement margin is maintained between the end of the normal depth adjustment mechanism and the main building structure to prevent the accumulation of errors during subsequent assembly.

[0056] Step 5: Flexible docking and internal stress release

[0057] The next adjacent keel unit is lifted, and the two adjacent keel units are connected by a multi-degree-of-freedom flexible hinge assembly. While the lifting slings are not completely detached, the arc-surface sliding mechanism built into the multi-degree-of-freedom flexible hinge assembly releases the spatial stress generated during lifting and assembly, absorbing multi-dimensional spatial displacement and angular assembly errors between adjacent keel units, allowing for ±5° angle adjustment and misalignment within 2cm.

[0058] Step Six: On-site Distance Measurement and Closed-Loop Operation

[0059] After the docking is completed, the measured spatial distance data between two adjacent keel units is obtained. Based on the measured spatial distance data, the excess part of the connecting rod is cut off on site and welded between adjacent nodes to form a stepped closed-loop construction flow operation.

[0060] Step 7: Rigid Welding Locking

[0061] After the spatial position of all the keel units in the field has been verified, the normal depth adjustment mechanism and the multi-degree-of-freedom flexible hinge assembly are rigidly welded and locked, transforming the flexible connection into an irreversible rigid connection to complete stress-free installation. Specifically, after the spatial angle and misalignment offset are adjusted to the theoretical elevation, a full-circumference fillet weld is performed to lock the end of the normal depth adjustment mechanism at its junction with the main structure, and continuous plug welding is performed on the overlapping junction area of ​​the multi-degree-of-freedom flexible hinge assembly.

[0062] Step 8: Secondary Survey and Installation of Facade

[0063] After the rigid welding and locking step is completed, a secondary spatial morphology acquisition step is performed: a secondary three-dimensional scan is performed on the completed fixed keel mesh to extract the real three-dimensional spatial node data after forming, and the processing and layout data of the glass surface material is generated using the real three-dimensional spatial node data to guide the installation of the surface material.

[0064] Example 2: Specific structure of the normal depth adjustment mechanism, refer to... Figure 3 and Figure 4 ;

[0065] This embodiment discloses in detail the internal mechanical structure of the core hardware normal depth adjustment mechanism mentioned in Embodiment 1.

[0066] The normal depth adjustment mechanism includes an outer sleeve 1 with a first threaded end and a second threaded end arranged opposite to each other, and a polygonal drive part 2 located in the middle, such as a hexagonal nut structure adapted to a wrench. The first threaded end and the second threaded end are respectively configured with internal threads in opposite directions, i.e., one end is left-handed and the other end is right-handed. They are fitted with corresponding external threaded connecting rods inside. The adjustment range of the double threaded sleeve is up to 10cm. It is tightened or loosened synchronously by tightening the hexagonal fixing part in the middle of the screw. After adjustment, the end is welded to the main structure. In principle, this node cannot be disassembled after construction, but it can be finely adjusted by turning the sleeve.

[0067] When performing step four, in response to the rotational driving force on the polygonal driving part 2, the external threaded connecting rods at both ends simultaneously perform linear movements in opposite directions to change the assembly adjustment stroke. This alternating double thread mechanism gives the node a large stroke tolerance capability.

[0068] Example 3: Specific structure of a multi-degree-of-freedom flexible hinge assembly, refer to... Figure 5 and Figure 6 ;

[0069] This embodiment discloses in detail the construction of another core hardware component, the multi-degree-of-freedom flexible hinge assembly, mentioned in Embodiment 1.

[0070] The multi-degree-of-freedom flexible hinge assembly includes a first connecting plate 3, a second connecting plate 4, and a first semi-open arc surface tube 5 and a second semi-open arc surface tube 6, which are respectively fixed to the ends of the two. The first semi-open arc surface tube 5 and the second semi-open arc surface tube 6 are cut and welded from a φ240*6mm semi-circular tube. The first semi-open arc surface tube 5 is welded to the first connecting plate 3 (φ260*8mm) first, and the second semi-open arc surface tube 6 belongs to another unit plate and is welded to the second connecting plate (φ218*6mm) first. After the two unit plates are adjusted into place, the connecting plate and the semi-open arc surface tube are welded together. The splicing method of the two semi-open arc surface tubes can meet the requirements of ±5° angle adjustment and positional offset within 2cm.

[0071] The outer diameter of the first semi-open arc surface tube 5 matches the inner diameter of the second semi-open arc surface tube 6. After the two are joined, they form a sleeve-type concentric sliding pair. When performing step five, the cylindrical sliding and fitting principle of the concentric sliding pair allows the adjacent keel units to undergo relative rotation and axial sliding in three-dimensional space, thereby perfectly eliminating the cumulative errors of civil engineering.

[0072] Example 4: When installing glass curtain walls, refer to Figure 7 In the factory, the connecting frame 7 is directly and synchronously installed on the keel unit. The connecting frame 7 can be made of aluminum alloy and is used for direct connection with the glass curtain wall. The keel surface is then coated with anti-rust paint. When the glass arrives on site, it can be installed directly, which further speeds up the construction progress and ensures the construction quality.

[0073] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Any variations or substitutions conceived without inventive effort should be included within the scope of protection of the invention. Therefore, the scope of protection of the invention should be determined by the scope defined in the claims.

Claims

1. A high-precision installation method for irregular curved curtain wall keel units, characterized in that: Includes the following steps: The three-dimensional spatial point cloud data of the main building structure is obtained, and a digital twin surface model containing an absolute coordinate system is reconstructed based on the three-dimensional spatial point cloud data. The curvature variation characteristics of the digital twin surface model are divided into equal grids to generate multiple keel unit processing data with spatial coordinate numbers, and multiple keel units are pre-formed based on the processing data. The first keel unit was suspended and hoisted to the predetermined spatial position using a multi-point adaptive balancing hoisting fixture. The keel unit is connected to the main building structure through the normal depth adjustment mechanism, and the bidirectional thread mechanism inside the normal depth adjustment mechanism is driven to extend and retract synchronously, so as to steplessly adjust the normal space entry and exit position of the keel unit and perform temporary positioning. The next adjacent keel unit is lifted, and the two adjacent keel units are connected by a multi-degree-of-freedom flexible hinge assembly. The arc-surface sliding fit mechanism built into the multi-degree-of-freedom flexible hinge assembly is used to release the spatial internal stress generated by lifting and assembly, so as to absorb the multi-dimensional spatial displacement and angular assembly error between adjacent keel units. After the spatial position of the entire keel unit is verified, the normal depth adjustment mechanism and the multi-degree-of-freedom flexible hinge assembly are rigidly welded and locked to transform the flexible connection into an irreversible rigid connection to complete stress-free installation.

2. The high-precision installation method for irregular curved curtain wall keel units according to claim 1, characterized in that: The method for obtaining three-dimensional spatial point cloud data of the main building structure includes the following steps: a high-precision reference control network with an absolute coordinate system is established in advance at the construction site, and multi-station scanning is performed through a three-dimensional topography acquisition device to filter out noise points, thereby fitting and generating a non-uniform rational B-spline surface model with continuous Gaussian curvature as the digital twin surface model.

3. The high-precision installation method for irregular curved curtain wall keel units according to claim 2, characterized in that: The method for prefabricating multiple keel units based on the processing data includes the following steps: using CNC continuous bending process to perform anti-distortion forming treatment on tubular profiles, and preset the springback compensation parameters corresponding to the yield strength of the material in the digital program. After forming, full penetration welding and multi-layer anti-corrosion coating curing are performed in the factory environment.

4. The high-precision installation method for irregular curved curtain wall keel units according to claim 3, characterized in that: The normal depth adjustment mechanism includes an outer sleeve with a first threaded end and a second threaded end arranged opposite to each other, and a polygonal drive unit disposed in the middle. The first threaded end and the second threaded end are respectively configured as internal threads with opposite directions of rotation and are fitted with corresponding external threaded connecting rods. In response to the rotational driving force on the polygonal drive unit, the external threaded connecting rods at both ends simultaneously perform linear movements in opposite directions to change the assembly adjustment stroke.

5. The high-precision installation method for irregular curved curtain wall keel units according to claim 4, characterized in that: The multi-degree-of-freedom flexible hinge assembly includes a first connecting plate, a second connecting plate, and a first semi-open arc surface tube and a second semi-open arc surface tube respectively fixed to the ends of the two. The outer diameter of the first semi-open arc surface tube matches the inner diameter of the second semi-open arc surface tube. After the two are connected, they form a sleeve-type concentric sliding pair, which allows the adjacent keel units to undergo relative rotation and axial sliding in three-dimensional space.

6. The high-precision installation method for irregular curved curtain wall keel units according to claim 5, characterized in that: After the temporary positioning step and before the rigid welding locking step, a small displacement margin is maintained between the end of the normal depth adjustment mechanism and the main building structure to prevent the accumulation of errors in subsequent assembly processes.

7. A high-precision installation method for irregular curved curtain wall keel units according to claim 5, characterized in that: The steps for rigidly welding and locking the normal depth adjustment mechanism and the multi-degree-of-freedom flexible hinge assembly specifically include: after the spatial angle and misalignment offset are adjusted to the theoretical elevation, a full-circumference fillet weld is performed to lock the end of the normal depth adjustment mechanism at the junction with the main structure, and continuous plug welding is performed on the overlapping junction area of ​​the first semi-open arc surface tube and the second semi-open arc surface tube of the multi-degree-of-freedom flexible hinge assembly.

8. The high-precision installation method for irregular curved curtain wall keel units according to claim 1, characterized in that: The method for hoisting the keel unit using a multi-point adaptive balancing hoisting fixture includes the following steps: pre-calculating the eccentric center of gravity coordinates of each independent keel unit based on its digital three-dimensional model, and asymmetrically configuring three or more rigging connection points on the keel unit based on the eccentric center of gravity coordinates to prevent out-of-plane instability and deflection during hoisting.

9. A high-precision installation method for irregular curved curtain wall keel units according to claim 5, characterized in that: After the multi-degree-of-freedom flexible hinge assembly is connected, the following steps are also included: obtaining the measured spatial distance data between two adjacent keel units, cutting off the excess part of the connecting rod on site according to the measured spatial distance data and welding it between adjacent nodes to form a stepped closed-loop construction flow operation.

10. A high-precision installation method for irregular curved curtain wall keel units according to claim 1, characterized in that: After the rigid welding and locking step is completed, a secondary spatial topography acquisition is performed. The secondary spatial topography acquisition method includes the following steps: performing a secondary three-dimensional scan on the completed fixed full-field keel mesh, extracting the real three-dimensional spatial node data after forming, and using the real three-dimensional spatial node data to generate processing and layout data of the glass surface material to guide the installation of the surface material.

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