Installation method of large-span special-shaped curved curtain wall based on BIM

Abstract

The application provides a large-span special-shaped curved surface curtain wall installation method based on BIM, three-dimensional modeling and virtual assembly are performed on the outer contour steel structure to form a complete skeleton structure; the outer contour steel structure is divided into a plurality of unit planes in a virtual space; a plurality of target plates are installed on the unit planes, and the positions of the target plates are measured by using a measuring device; the production and manufacturing of curtain wall fittings are guided according to the deformation amount of the outer contour steel structure, and the curtain wall is installed by using the curtain wall fittings; the positions of the target plates are measured again and recorded; the above steps are repeated to install curtain wall glasses of another unit plane, until all the outer side surface curtain wall glasses of the outer contour steel structure are installed, and the problem of difficult installation and positioning of the special-shaped curved surface glass curtain wall is solved.

Description

Technical Field

[0001] This invention relates to the field of curtain wall installation, and in particular to a BIM-based method for installing large-span irregular curved curtain walls. Background Technology

[0002] Glass curtain walls are generally constructed by splicing together square unit glass panels and are typically fixed to the building facade. For traditional office buildings, curtain wall glass is usually installed and fixed to the outer edge of the floor slab using brackets or slots. However, for some irregularly shaped facades or buildings with irregular structural designs, the curtain wall often has a large-span curved surface, making it difficult to connect it to the floor slab using simple connecting brackets. This is especially true when the exterior is constructed with an irregular steel structure, where the glass curtain wall needs to be parallel to the irregular surface. However, due to overall or localized deformation from steel structure welding, it is difficult to accurately locate the reference points for the curtain wall glass when using on-site welded brackets, thus posing significant challenges to curtain wall installation. Summary of the Invention

[0003] This invention provides a BIM-based method for installing large-span irregular curved glass curtain walls, which solves the problem of difficult positioning during installation.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a BIM-based method for installing large-span irregular curved curtain walls. The outer contour steel structure is modeled in 3D and virtually assembled to form a complete skeleton structure; In virtual space, the outer steel structure is divided into multiple unit planes; Multiple target plates are installed on the unit plane and the position of each target plate is determined by a measuring device. The deformation of the outer contour steel structure guides the production and manufacturing of curtain wall accessories, and the curtain wall is installed using the curtain wall accessories. Measure and record the position of each target plate again; Repeat the above steps to install the curtain wall glass of the other unit planes until all the curtain wall glass on the outer contour steel structure is installed.

[0005] In the preferred embodiment, the specific method for installing the unitized planar curtain wall is as follows: Select the size of the curtain wall glass, arrange the curtain wall glass on the unit plane, project the glass mounting holes onto the unit plane, and record the positions; The glass mounting holes that overlap with the position of the unit plane steel structure are selected as reference holes; Analyze the glass mounting holes that do not overlap with the steel structure location and design additional keel frames in adjacent locations; Virtual installation of the keel frame, reference base, glass assembly components, and curtain wall glass; During the construction process, the reference base and glass assembly are made, and the materials for each keel frame are prepared. After the outer contour steel structure is constructed and assembled, the pre-made reference bases are installed one by one according to their positions in the virtual space, and target plates are installed on the reference bases. The position of each target plate is measured using a measuring device, and the deformation state of the outer contour steel structure is calculated and analyzed based on the measured position of the target plates. The installation position and length of the keel frame are finely adjusted in virtual space according to the deformation state of the outer contour steel structure, and manufactured according to the design length. After the curtain wall glass and all accessories are manufactured, they are transported to the site. Based on their positions in virtual space, install additional keel frames; The remaining reference bases were installed using the supplementary installed keel frame and outer contour steel structure; Adjust the position of each reference base and install the curtain wall glass using glass assembly components.

[0006] In the preferred embodiment, the measuring device is a total station or a laser rangefinder.

[0007] In the preferred embodiment, after the curtain wall glass of each unit plane is installed, the target plate is measured periodically using a measuring device to analyze and record the deformation of the outer contour steel structure.

[0008] In the preferred embodiment, the reference base includes a base plate with a ball joint seat in the center and a connecting arm on one side. The connecting arm has clamping devices at both ends for clamping the steel rods of the outer contour steel structure. The glass assembly includes a glass positioning component for fixing the curtain wall glass. An extension connecting rod is provided on one side of the glass positioning component, and the extension connecting rod is inserted into the ball joint seat.

[0009] In the preferred embodiment, the connecting arm has a turntable at its center, with multiple arc-shaped holes along its circumference. The base plate has multiple stop threaded holes along its circumference and multiple connecting pins. Each connecting pin passes through the arc-shaped hole to be threadedly connected to the stop threaded hole. Each end of the connecting arm has a strip-shaped through groove. The clamping device has a rotating rod that is engaged in the strip-shaped through groove. The rotating rod can rotate and slide along the strip-shaped through groove. The end of the rotating rod has a threaded first nut.

[0010] In the preferred embodiment, a first flange sleeve is provided on one side of the base plate, and a hemispherical groove is provided in the center of the first flange sleeve and the steel structure rod. The first flange sleeve and the center of the base plate are fitted together so that the hemispherical groove forms a spherical space. A ball sleeve is provided in the spherical space, and the center of the ball sleeve is threadedly connected to the extension connecting rod. Multiple threaded first tightening bolts are provided on the side wall of the first flange sleeve along the circumference, and one end of the first tightening bolt abuts against the outer wall of the extension connecting rod.

[0011] In a preferred embodiment, the glass positioning component includes a snap-fit ​​plate and positioning posts. Each of the four corners of the snap-fit ​​plate is provided with a positioning post, and the four corners of the positioning posts are sleeved with the snap-fit ​​plates. A second flange sleeve is provided in the center of the positioning post, and the second flange sleeve is sleeved with the extension connecting rod. A gap is provided between the second flange sleeve and the extension connecting rod so that the extension connecting rod can move parallel to the central axis of the second flange sleeve. Multiple threaded second tightening bolts are provided on the side wall of the second flange sleeve in the circumferential direction, and one end of the second tightening bolt abuts against the outer wall of the extension connecting rod.

[0012] In the preferred embodiment, each positioning post is fitted with a flexible sleeve, which includes a spacer portion and a connecting portion, and the flexible sleeve is fitted into the inner wall of the glass mounting hole.

[0013] In the preferred embodiment, a target plate installation reference is provided near the outer edge of the base plate.

[0014] The beneficial effects of this invention are as follows: Based on BIM, the outer contour steel structure is modeled and designed in the early stage of building construction, and the optimal curtain wall size selection and layout scheme are designed, which facilitates the pre-preparation of curtain wall and accessories and pre-installation, saving construction time; By installing targets on the steel structure, the deformation of the steel structure is detected at different stages of construction, feedback is provided and the design of curtain wall accessories is updated, the number of additional keels to be installed is reduced, costs are saved, and defects can be repaired in time, extending the building's lifespan; The installation points of the curtain wall glass and targets are determined by the reference base, and the position and angle of the reference base can be adjusted in conjunction with the glass assembly, and the distance between the curtain wall and the steel structure can also be adjusted to adapt to complex steel structure outer contours, and it can be reused. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the steel structure of the building's airfoil top profile.

[0017] Figure 2 This is a side view of the steel structure.

[0018] Figure 3 This is a schematic diagram of the virtual layout of the curtain wall.

[0019] Figure 4 It is a projection diagram of the holes in the curtain wall glass.

[0020] Figure 5 This is a schematic diagram of a virtual mounting reference base in the overlapping area of ​​the holes.

[0021] Figure 6 This is a schematic diagram of the optimal supplementary keel frame design.

[0022] Figure 7 This is a schematic diagram for monitoring deformation during steel structure construction.

[0023] Figure 8This is a diagram showing the installation of the keel frame.

[0024] Figure 9 This is a schematic diagram of the remaining reference base installation positions.

[0025] Figure 10 It is a diagram of the curtain wall glass installation.

[0026] Figure 11 This is a schematic diagram showing the deformation measured after the curtain wall is installed.

[0027] Figure 12 This is a schematic diagram of the installation of long-arm and short-arm type reference bases.

[0028] Figure 13 This is a detailed drawing of the outer contour steel structure of a single arm.

[0029] Figure 14 This is a schematic diagram showing the installation of the glass by fitting the reference base and the glass assembly.

[0030] Figure 15 This is a schematic diagram showing the separation of the reference base and the glass assembly.

[0031] Figure 16 This is a schematic diagram of the exploded reference pedestal.

[0032] Figure 17 This is a schematic diagram of an explosion of a glass assembly.

[0033] Figure 18 This is a cross-sectional view of the reference base and glass assembly.

[0034] Figure 19 This is an enlarged view of the flexible sleeve.

[0035] In the diagram: Outer contour steel structure 1; Steel structure rod 101; Unit plane 2; Curtain wall glass 3; Glass mounting hole 301; Reference base 4; Foundation plate 401; Ball hinge seat 402; Clamping device 403; Connecting arm 404; Strip through groove 405; Turntable part 406; Arc hole 407; Connecting pin 408; Stop threaded hole 409; Rotating rod 410; First nut 411; Hemispherical groove 412; Ball sleeve 413; First flange sleeve 414 First tightening bolt 415; Target plate installation reference 416; Keel frame 5; Glass assembly 6; Glass positioning component 601; Extension connecting rod 602; Snap-fit ​​pressure plate 603; Positioning post 604; Adhesive plate 605; Second flange sleeve 606; Second tightening bolt 607; End nut 608; Spacer 609; Flexible sleeve 610; Spacer part 611; Sleeve part 612; Second nut 613; Target plate 7; Measuring device 8; Lock nut 9. Detailed Implementation

[0036] like Figure 1-19 A BIM-based installation method for large-span irregular curved surface curtain walls. The outer contour steel structure 1 is modeled in 3D and virtually assembled to form a complete skeleton structure; In virtual space, the outer contour steel structure 1 is divided into multiple unit planes 2; Multiple target plates 7 are installed on unit plane 2 and the position of each target plate 7 is measured using measuring device 8. The production and manufacturing of curtain wall accessories are guided according to the deformation of the outer contour steel structure 1, and the curtain wall is installed using the curtain wall accessories. Measure and record the position of each target plate 7 again; Repeat the above steps to install the curtain wall glass 3 of the other unit plane 2 until all the curtain wall glass 3 on the outer contour steel structure 1 is installed.

[0037] In the preferred embodiment, the specific method for installing the unitized planar curtain wall is as follows: Select the size of the curtain wall glass 3, arrange the curtain wall glass 3 on the unit plane 2, project the glass mounting holes 301 onto the unit plane 2, and record the positions; The glass mounting hole 301, which overlaps with the steel structure position of unit plane 2, is selected as the reference hole; Analyze the glass mounting holes 301 that do not overlap with the steel structure and design the keel frame 5 in the adjacent locations; Virtually install the keel frame 5, the reference base 4, the glass assembly 6, and the curtain wall glass 3; During the construction process, the reference base 4 and glass assembly 6 are manufactured, and materials are prepared for each keel frame 5. After the outer contour steel structure 1 is constructed and assembled, the pre-made reference base 4 is installed one by one according to its position in the virtual space, and the target plate 7 is installed on the reference base 4. The position of each target plate 7 is measured by the measuring device 8, and the deformation state of the outer contour steel structure 1 is calculated and analyzed based on the measured position of the target plate 7. The installation position and length of the keel frame 5 are finely adjusted in virtual space according to the deformation state of the outer contour steel structure 1, and manufactured according to the design length. After the curtain wall glass 3 and all its accessories are manufactured, they will be transported to the site. Based on their positions in virtual space, install additional 5 keel frames; The remaining reference base 4 is installed using the supplementary installed keel frame 5 and outer contour steel structure 1; Adjust the position of each reference base 4, and install the curtain wall glass 3 using the glass assembly 6.

[0038] In the preferred embodiment, the measuring device 8 is a total station or a laser rangefinder.

[0039] The target plate 7 can be in the form of a base plus a hinge plate, and the hinge plate can be rotated at a certain angle to face the measuring device 8.

[0040] If a total station is used for measurement, the target plate 7 can be in the form of a front sight and surrounding scale, and can be used as a reflector. If the measuring device 8 is a laser rangefinder, the distance to the target plate 7 can be measured by illuminating the center of the target plate with a laser.

[0041] The deformation of the outer contour steel structure 1 was measured once before and once after the installation of the curtain wall glass 3 to analyze and compare the degree of influence of the curtain wall on the outer contour steel structure 1.

[0042] In the preferred embodiment, after the curtain wall glass 3 of each unit plane 2 is installed, the target plate 7 is measured periodically by the measuring device 8 in order to analyze and record the deformation of the outer contour steel structure 1.

[0043] The measurement of deformation of the outer contour steel structure 1 is mainly divided into four stages: before curtain wall installation, after curtain wall installation, after building completion, and every certain number of years after building completion. By monitoring the deformation, quantitative data is continuously provided for the building, indicating whether the curtain wall glass needs to be reinforced, timely detection and repair of strength defects, and extension of the building's service life.

[0044] In the preferred embodiment, the reference base 4 includes a base plate 401, a ball joint seat 402 is provided in the center of the base plate 401, a connecting arm 404 is provided on one side of the base plate 401, and clamping devices 403 are provided at both ends of the connecting arm 404. The clamping devices 403 are used to clamp the steel rods 101 of the outer contour steel structure 1. The glass assembly 6 includes a glass positioning component 601 for fixing the curtain wall glass 3. An extension connecting rod 602 is provided on one side of the glass positioning component 601, and the extension connecting rod 602 is inserted into the ball joint seat 402.

[0045] After the clamping device 403 is installed on the steel frame rod 101, the glass positioning component 601 is installed at the intersection of the four rectangular curtain wall glass pieces 3, fixing one corner of each of the four curtain wall glass pieces 3 at once, and connecting and fixing them to the ball hinge seat 402 through the extension connecting rod 602.

[0046] In the preferred embodiment, the connecting arm 404 has a turntable 406 at its center, the turntable 406 has multiple arc-shaped holes 407 along its circumference, the base plate 401 has multiple stop threaded holes 409 along its circumference, and multiple connecting pins 408 are also provided. Each connecting pin 408 passes through the arc-shaped holes 407 to be threadedly connected to the stop threaded holes 409. Each end of the connecting arm 404 has a strip-shaped through groove 405. The clamping device 403 has a rotating rod 410, which is inserted into the strip-shaped through groove 405. The rotating rod 410 can rotate and slide along the strip-shaped through groove 405. The end of the rotating rod 410 is provided with a threaded first nut 411.

[0047] The base plate 401 can rotate slightly relative to the turntable 406 to facilitate adjusting the orientation of the connecting arm 404 toward the nearest steel structure pole 101. The two clamping devices 403 have adjustable spacing and can rotate to accommodate steel structure poles 101 with different spacing and angles. The position of the ball joint seat 402 at the center of the base plate 401 can also be adjusted so that the glass positioning component 601 is close to the mating position of the four curtain wall glass panels 3. After adjustment, the first nut 411 and the connecting pin 408 can be locked to fix the position of the clamping device 403 and the orientation of the connecting arm 404.

[0048] The clamping device 403 consists of two clamping petals. The grooves of the clamping petals are rectangular or arc-shaped. The two clamping petals can be connected by bolts to close together and clamp the rectangular rod and the round rod.

[0049] In the preferred embodiment, a first flange sleeve 414 is provided on one side of the base plate 401. A hemispherical groove 412 is provided in the center of the first flange sleeve 414 and the steel rod 101. The first flange sleeve 414 and the center of the base plate 401 cooperate to form a spherical space with the hemispherical groove 412. A ball sleeve 413 is provided in the spherical space. The center of the ball sleeve 413 is threadedly connected to the extension connecting rod 602. A plurality of threaded first tightening bolts 415 are provided on the side wall of the first flange sleeve 414 along the circumferential direction. One end of the first tightening bolt 415 abuts against the outer wall of the extension connecting rod 602.

[0050] The extension link 602 is threaded to the ball sleeve 413, and the length of the end is locked by the lock nut 9.

[0051] In a preferred embodiment, the glass positioning component 601 includes a snap-fit ​​plate 603 and positioning posts 604. Each of the four corners of the snap-fit ​​plate 603 is provided with a positioning post 604, and the four corners of the positioning posts 604 are sleeved with each snap-fit ​​plate 603. A second flange sleeve 606 is provided in the center of the positioning post 604. The second flange sleeve 606 is sleeved with the extension connecting rod 602. A gap 609 is provided between the second flange sleeve 606 and the extension connecting rod 602 so that the extension connecting rod 602 can move parallel to the central axis of the second flange sleeve 606. A plurality of threaded second tightening bolts 607 are provided circumferentially on the side wall of the second flange sleeve 606, and one end of the second tightening bolt 607 abuts against the outer wall of the extension connecting rod 602.

[0052] The extension link 602 has a large-diameter section at one end near the glass positioning component 601, and the second flange sleeve 606 has a threaded end nut 608 at one end. The end nut 608 limits the large-diameter section of the extension link 602 to prevent the extension link 602 from moving axially but does not affect its translation.

[0053] In a preferred embodiment, each positioning post 604 is fitted with a flexible sleeve 610, which includes a spacer portion 611 and a sleeve portion 612. The flexible sleeve 610 is fitted into the inner wall of the glass mounting hole 301.

[0054] The flexible sleeve 610 separates the rigid snap-fit ​​plate 603 and the bonding plate 605 from the curtain wall glass 3, thus playing a role in vibration isolation.

[0055] The main components of the reference base 4 and the glass assembly 6 are pre-assembled as a single unit. After the clamping device 403 is installed on the steel frame rod 101, the center position of the ball hinge seat 402 is adjusted to be close to the center of the theoretical joint of the four curtain wall glass 3. Using the glass mounting hole 301 of the installed curtain wall glass 3 as a reference, the clamping plate 603 is inserted. If it is relatively smooth, the other curtain wall glass 3 is installed. The positioning posts 604 of the clamping plate 603 are inserted into the positioning posts 604 through the glass mounting hole 301 again and the second nut 613 on the back side is put on. The extension is adjusted. The angle of the connecting rod 602 is simultaneously extended. The connecting rod 602 is translated relative to the second flange sleeve 606, so that the positioning pin 604 and the glass mounting hole 301 gradually become concentric. The sleeve part 612 of the flexible sleeve 610 is inserted into the glass mounting hole 301, and the second nut 613 is locked. The second tightening bolt 607 and the first tightening bolt 415 tighten the extension connecting rod 602 to lock the position and angle of the extension connecting rod 602. The lock nut 9 locks and fixes the extension length of the extension connecting rod 602. The first nut 411 and the connecting pin 408 are locked to fix the position and angle of the reference seat 4.

[0056] In the preferred embodiment, a target plate mounting reference 416 is provided on the outer edge of the base plate 401.

[0057] Multiple mounting bases 416 can be reserved along the axial direction of the base plate 401 to connect the mounting brackets of the target plate 7, thus preventing the target plate 7 from being obstructed.

[0058] After the reference base 4 and glass assembly 6 are installed and positioned, the connection gaps of the main components can be spot welded to prevent loosening. If disassembly is required later, the weld points can be quickly removed using a cutting and grinding machine, so that the components can be reused.

[0059] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A BIM-based installation method for large-span irregular curved curtain walls, characterized by: The outer contour steel structure (1) is modeled in three dimensions and virtually assembled to form a complete skeleton structure; In the virtual space, the outer contour steel structure (1) is divided into multiple unit planes (2); Multiple target plates (7) are installed on the unit plane (2) and the position of each target plate (7) is measured using a measuring device (8). The curtain wall accessories are manufactured according to the deformation of the outer contour steel structure (1), and the curtain wall is installed using the curtain wall accessories. Measure and record the position of each target plate (7) again; Repeat the above steps to install the curtain wall glass (3) of the other unit plane (2) until all the curtain wall glass (3) of the outer contour steel structure (1) is installed; The specific installation method for unitized planar curtain walls is as follows: Select the size of the curtain wall glass (3), arrange the curtain wall glass (3) on the unit plane (2), project the glass mounting holes (301) onto the unit plane (2), and record the position; The glass mounting holes (301) that overlap with the steel structure position of the unit plane (2) are selected as reference holes; Analyze the glass mounting holes (301) that do not overlap with the steel structure and design the keel frame (5) in the adjacent locations; Virtual installation of the keel frame (5), the reference base (4), the glass assembly (6) and the curtain wall glass (3); During the construction process, the reference base (4) and glass assembly (6) are made, and the materials for each keel frame (5) are prepared. After the outer contour steel structure (1) is constructed and assembled, the pre-made reference base (4) is installed one by one according to its position in the virtual space, and the target plate (7) is installed on the reference base (4). The position of each target plate (7) is measured by the measuring device (8), and the deformation state of the outer contour steel structure (1) is calculated and analyzed based on the measured position of the target plate (7). The installation position and length of the keel frame (5) are finely adjusted in virtual space according to the deformation state of the outer contour steel structure (1), and manufactured according to the design length; After the curtain wall glass (3) and all accessories are manufactured, they are transported to the site; Based on their positions in virtual space, install additional keel frames (5); The remaining reference base (4) is installed using the supplementary installed keel frame (5) and outer contour steel structure (1); Adjust the position of each reference base (4) and install the curtain wall glass (3) using the glass assembly (6).

2. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 1, characterized in that: The measuring device (8) is a total station or a laser rangefinder.

3. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 1, characterized in that: After the curtain wall glass (3) of each unit plane (2) is installed, the target plate (7) is measured periodically by the measuring device (8) in order to analyze and record the deformation of the outer contour steel structure (1).

4. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 1, characterized in that: The reference base (4) includes a base plate (401), a ball joint seat (402) is provided in the center of the base plate (401), a connecting arm (404) is provided on one side of the base plate (401), and clamping devices (403) are provided at both ends of the connecting arm (404). The clamping devices (403) are used to clamp the steel rod (101) of the outer contour steel structure (1). The glass assembly (6) includes a glass positioning component (601) for fixing the curtain wall glass (3). An extension connecting rod (602) is provided on one side of the glass positioning component (601), and the extension connecting rod (602) is inserted into the ball joint seat (402).

5. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 4, characterized in that: The connecting arm (404) has a turntable (406) in the center. The turntable (406) has multiple arc-shaped holes (407) along the circumference. The base plate (401) has multiple stop threaded holes (409) along the circumference. It also has multiple connecting pins (408). Each connecting pin (408) passes through the arc-shaped hole (407) to be threadedly connected to the stop threaded hole (409). Each end of the connecting arm (404) has a strip-shaped through groove (405). The clamping device (403) has a rotating rod (410). The rotating rod (410) is inserted into the strip-shaped through groove (405). The rotating rod (410) can rotate and slide along the strip-shaped through groove (405). The end of the rotating rod (410) has a first nut (411) with a threaded connection.

6. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 4, characterized in that: A first flange sleeve (414) is provided on one side of the base plate (401). A hemispherical groove (412) is provided in the center of the first flange sleeve (414) and the steel rod (101). The first flange sleeve (414) and the center of the base plate (401) cooperate to form a spherical space with the hemispherical groove (412). A ball sleeve (413) is provided in the spherical space. The center of the ball sleeve (413) is threadedly connected to the extension connecting rod (602). A number of threaded first tightening bolts (415) are provided on the side wall of the first flange sleeve (414) along the circumferential direction. One end of the first tightening bolt (415) abuts against the outer wall of the extension connecting rod (602).

7. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 6, characterized in that: The glass positioning component (601) includes a snap-fit ​​pressure plate (603) and a positioning post (604). The snap-fit ​​pressure plate (603) has a positioning post (604) at each of its four corners. The positioning post (604) is sleeved with each snap-fit ​​pressure plate (603) at its four corners. The positioning post (604) has a second flange sleeve (606) in the center. The second flange sleeve (606) is sleeved with the extension connecting rod (602). There is a gap (609) between the second flange sleeve (606) and the extension connecting rod (602) so that the extension connecting rod (602) can move parallel to the central axis of the second flange sleeve (606). The side wall of the second flange sleeve (606) has a plurality of threaded second tightening bolts (607) along the circumferential direction. One end of the second tightening bolt (607) abuts against the outer wall of the extension connecting rod (602).

8. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 7, characterized in that: Each positioning post (604) is fitted with a flexible sleeve (610), which includes a partition part (611) and a sleeve part (612). The flexible sleeve (610) is fitted with the inner wall of the glass mounting hole (301).

9. The BIM-based installation method for large-span irregular curved surface curtain walls according to claim 4, characterized in that: A target plate mounting reference (416) is provided on the outer edge of the base plate (401).

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