Prefabricated Continuous Free-Form Glulam Ceiling System and its Construction Method

Abstract

This invention provides a prefabricated continuous free-form glulam ceiling system and its construction method. The system includes a main structural steel beam, steel column flanges, free-form glulam main panels, dovetail joints, and concealed F-shaped metal connectors. The glulam main panels undergo rough back processing, node processing, front rough processing, and front precision processing in the factory using industrial robots, achieving integrated high-precision manufacturing of the free-form shape and assembly nodes. Adjacent glulam components are connected by customized dovetail joints. The glulam main panels are prefabricated and connected to the main structural steel beams via concealed F-shaped metal connectors, and are not exposed after installation. The ceiling modules are assembled and glued in the factory, and then installed on-site by hoisting as a whole and bolting to the steel column flanges, thus achieving a prefabricated construction mode with a high prefabrication rate and low on-site dependence.

Description

Technical Field

[0001] This invention relates to the field of timber structure building technology, and in particular to a prefabricated continuous free-form glued laminated timber ceiling system and its construction method. Background Technology

[0002] In existing technologies, large-scale free-form or irregularly shaped glued laminated timber ceilings typically employ a construction method of component-based fabrication and on-site piece-by-piece installation. The geometric alignment and surface continuity between components rely heavily on repeated adjustments and corrections by construction workers on-site. This not only results in long construction cycles and low efficiency but also makes installation accuracy highly susceptible to human factors, hindering the achievement of stable and replicable construction quality. In these construction scenarios, existing structural nodes often utilize universal or on-site adaptable connection methods. The node design fails to integrate with the actual geometry and assembly sequence of the components, leading to insufficient node fabrication precision and unclear assembly relationships. This makes it difficult to support a prefabricated construction model that prioritizes factory prefabrication and rapid on-site installation.

[0003] Against the backdrop of the continuous development of low-carbon buildings and prefabricated construction, timber structures, due to their high renewability, low processing energy consumption, and ease of factory production, are widely used in interior ceiling systems for public buildings and large-span spaces. As architectural space design increasingly demands integrity, continuity, and free-form surface expression, free-form ceilings formed using glued laminated timber (GLLT) components are gradually becoming an important spatial design form. However, large-scale free-form GLLT ceilings face significant construction and structural challenges during project implementation. On the one hand, these ceiling components have complex geometric shapes and large dimensional variations. Traditional construction methods often require on-site installation of each component and manual adjustments to ensure surface continuity and installation accuracy, resulting in low construction efficiency and insufficient quality stability. On the other hand, free-form GLLT ceilings typically require numerous non-standard connection nodes to connect components to each other and to the main structure. Existing node construction methods are difficult to effectively match with high-precision, prefabricated construction methods, further exacerbating the complexity of on-site construction.

[0004] In existing technologies, large-scale free-form glued laminated timber ceilings typically employ a construction method of prefabricating components in a decentralized manner and then installing them piece by piece on-site. A typical construction process includes:

[0005] First, based on the freeform surface design model, the overall ceiling is divided into several irregularly shaped glued laminated timber components;

[0006] Then, the glued laminated timber components are processed in the factory to form a general curved shape;

[0007] After the components are transported to the construction site, they are installed one by one using hoisting equipment or manually.

[0008] Finally, the construction workers repeatedly adjusted the positions of components, the angles of node connections, and the installation sequence on site to ensure the continuity of the overall curved surface and the visual effect.

[0009] The above construction methods rely heavily on the experience of construction personnel in practical applications. The geometric alignment between components mainly relies on manual judgment and on-site correction. This not only results in a long construction period but also makes it difficult to control the installation accuracy consistently, especially when there are many components of large size.

[0010] Corresponding to the above construction methods, at the structural level, existing free-form plywood ceilings adopt a modular construction system, typically using general-purpose or semi-custom-made joints. The overall free-form surface is divided into several plywood units based on processing capabilities and transportation conditions, and these units are connected by joints to form the overall shape.

[0011] Freeform glulam ceiling components are typically connected to each other and to the main structure using exposed metal connectors, bolts, or on-site adaptable connections.

[0012] This type of node construction typically has the following characteristics:

[0013] The node-based approach primarily aims to meet basic connection requirements, lacking systematic customization for specific freeform surface geometries.

[0014] The correlation between node machining accuracy and component installation sequence is low, making it difficult to establish self-alignment or assembly guidance relationships.

[0015] The lack of coordination between the design phase and the construction method in node construction means that manual adjustments are still required to eliminate errors during on-site installation.

[0016] However, existing free-form glulam ceilings typically employ a construction method of prefabricating components separately and installing them piece by piece on-site. Due to the complex geometric shapes of the components and the high requirements for surface continuity, the spatial relationships between the components are difficult to fully determine at the factory stage. As a result, during component installation, construction personnel must repeatedly align, adjust, and correct the components on-site to ensure the overall finished effect.

[0017] Therefore, the fact that the construction method mainly relies on on-site manual adjustments is the fundamental reason that restricts the efficiency and quality of free-form glued laminated timber ceiling projects in the existing technology, and constitutes the main drawback of the existing technology.

[0018] In addition, the structural node design is difficult to support the needs of high-precision prefabricated construction and meet design requirements.

[0019] In construction models that rely heavily on on-site adjustments, existing structural nodes are typically designed as general-purpose or semi-customized connections with a certain "installation margin" to allow for error compensation on-site. However, these nodes often fail to establish a precise correspondence with the actual geometry and assembly sequence of the components during the design phase, resulting in limited node machining accuracy and component positioning capabilities.

[0020] This further exacerbates the reliance on manual adjustments, making it difficult for components to achieve self-alignment or rapid locking during installation, forming a technical closed loop of "construction methods relying on manual adjustments - node structures lacking assembly guidance - further reliance on manual adjustments".

[0021] Therefore, how to achieve highly prefabricated production and high-precision assembly construction of glued laminated timber ceiling components while meeting the design requirements of free-form surfaces through a reasonable structural system and construction method has become an urgent problem to be solved in this technical field. Summary of the Invention

[0022] The purpose of this invention is to provide a prefabricated continuous free-form glued laminated timber ceiling system and its construction method. By achieving a high degree of prefabrication and precise matching of components and nodes in the factory stage, the reliance on manual adjustments on the construction site is reduced, thereby significantly improving construction efficiency and installation accuracy.

[0023] To achieve the above objectives, the present invention adopts the following technical solution:

[0024] A prefabricated continuous free-form glulam ceiling system includes roof panels, main structural steel beams, steel column flanges, concealed F-shaped metal connectors, dovetail tenons, glulam main panels, and base columns;

[0025] The roof panel is installed on the main structural steel beam, which is welded to the steel column flange as a whole and connected to the bottom column through the steel column flange. The lower surface of the steel column flange adopts a horizontal structure to form a ceiling installation reference surface.

[0026] The glued laminated timber main panel is connected to the main structural steel beam through concealed F-shaped metal connectors. The lower surface of the glued laminated timber main panel adopts a continuous free-form ceiling interface that matches the roof panel and the main structural steel beam.

[0027] Preferably, the glued laminated timber main panel is assembled from multiple glued laminated timber components, and the splicing positions between adjacent glued laminated timber main panels are connected by dovetail joints to realize the assembly connection of adjacent glued laminated timber components.

[0028] Preferably, the multiple glued laminated timber main panels are of irregular length and are spliced ​​in a staggered manner during overall assembly; the end splices of two adjacent columns or rows of glued laminated timber main panels are staggered from each other, so that the entire continuous free-form ceiling surface does not form a continuous straight splice.

[0029] Preferably, the concealed F-shaped metal connector includes a vertical surface and a horizontal surface. The vertical surface is fixed to the main structural steel beam by screws, and the horizontal surface is fixedly disposed on the back of the glued laminated timber main panel to realize the connection between the glued laminated timber main panel and the main structural steel beam.

[0030] Preferably, the back of the glued laminated timber main panel has a pre-processed stepped geometric structure; the vertical surface includes a vertical mounting plate, and the horizontal surface includes an upper connecting wing plate and a lower connecting wing plate extending from the same side of the vertical mounting plate to form an F-shaped structure; the vertical mounting plate is attached to and fixed to the side of the main structural steel beam by connectors; the extending direction of the upper connecting wing plate and the lower connecting wing plate is consistent with the extension direction of the stepped geometric structure on the back of the glued laminated timber main panel used to accommodate the connectors; the upper connecting wing plate and the lower connecting wing plate are inserted into and embedded in the pre-processed stepped geometric structure on the back of the glued laminated timber main panel, and are concealedly fastened to the glued laminated timber main panel from the back by fasteners.

[0031] The present invention also provides a construction method for a prefabricated continuous free-form surface glued laminated timber ceiling system, comprising the following steps:

[0032] Step S1: Rough processing of the back of the glued laminated timber:

[0033] Fix the glued laminated timber blank to be processed at the processing station with its back facing the industrial robot processing tool;

[0034] The industrial robot performs rough processing on the back of the glued laminated timber main panel according to a pre-set processing path. This back side is invisible after the ceiling system is installed. Excess material is removed, and a stepped geometric structure is formed to reserve space for the subsequent installation of concealed F-shaped metal connectors. Step S2: Dovetail joint and node interface processing:

[0035] After completing the rough processing on the back, the edges and designated locations of the glued laminated timber main panel are processed, including:

[0036] Dovetail joint processing between adjacent glued laminated timber panels;

[0037] Processing of node slots or mounting interfaces for installing concealed F-shaped metal connectors;

[0038] The dovetail joints and node interfaces are customized according to the assembly position of the glued laminated timber main panel in the overall free-form surface.

[0039] Step S3: Turning and rough processing of the front side of the glued laminated timber:

[0040] The glued laminated timber main panel, after the back and node processing is completed, is flipped so that its front faces the industrial robot processing tool; the front of the glued laminated timber main panel is then rough-processed to make it approximate the target freeform surface shape.

[0041] Step S4: Precise processing of the front side of the glued laminated timber:

[0042] After the rough processing of the front side is completed, the front side of the glued laminated timber main panel is precisely processed to form the final free-form surface shape, so that it meets the requirements of the ceiling system for surface continuity and splicing accuracy.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] This invention reverse-engineers the structural system with the goal of prefabricated construction. The implementation path of "high-level prefabrication in the factory and overall or modular hoisting on site" is determined at the planning stage. The division method, splicing relationship and connection method of glued laminated timber components are systematically designed, so that the components form a clear assembly logic and positioning relationship. This avoids the problem of traditional free-form ceilings relying on repeated manual correction and adjustment on site, and improves the certainty of construction and the degree of industrialization.

[0045] This invention provides integrated control over the customized design and manufacturing of component connection nodes. The dovetail joints between glued laminated timber (GLLT) components and the concealed F-shaped metal connectors between GLLT components and the main structural steel beams are parametrically designed based on the spatial position of the components within the overall free-form surface. These are then integrated into the factory process using industrial robots. This ensures that the connection nodes not only provide structural connection but also assembly guidance and positioning, thereby achieving self-positioning and error control during assembly and significantly improving structural accuracy.

[0046] This invention employs a multi-stage processing method based on industrial robots. Through processes such as back roughing, node processing, flipping front roughing, and front precision processing, it achieves high-precision forming of free-form surface shape and node structure while ensuring processing efficiency. This allows the surface shape and connection relationship to be matched during the manufacturing stage, providing a reliable geometric basis for subsequent overall assembly.

[0047] This invention achieves prefabricated connection between the glulam timber components and the main structural steel beams by assembling and gluing them together in the factory and pre-installing concealed F-shaped metal connectors in the glulam timber ceiling modules. This allows the ceiling to be installed as a complete unit. On-site construction only requires hoisting and bolting the steel column flanges, significantly reducing on-site construction complexity, shortening the construction period, reducing the risks of working at heights, and improving construction safety and project quality stability.

[0048] In summary, this invention achieves industrialized closed-loop control of free-form glued laminated timber ceilings from design to construction through the system integration of "structural system design - customized node processing - industrial robot precision control - overall factory assembly - rapid on-site installation". It has significant advantages in terms of construction efficiency, assembly accuracy, structural reliability and construction organization optimization. Attached Figure Description

[0049] Figure 1 A schematic diagram of a prefabricated continuous freeform surface glued laminated timber ceiling system provided for an embodiment of the present invention;

[0050] Figure 2 An exploded structural diagram of a prefabricated continuous free-form glued laminated timber ceiling system provided as an embodiment of the present invention;

[0051] Figure 3 A schematic diagram of the structure of multiple glued laminated timber main panels in a prefabricated continuous free-form surface glued laminated timber ceiling system provided for embodiments of the present invention;

[0052] Figure 4 A schematic diagram of the back structure of the glued laminated timber main panel after staggered assembly in a prefabricated continuous free-form surface glued laminated timber ceiling system provided for an embodiment of the present invention;

[0053] Figure 5 A schematic diagram of the front structure of the glued laminated timber main panel after staggered assembly in a prefabricated continuous free-form surface glued laminated timber ceiling system provided for an embodiment of the present invention;

[0054] Figure 6 A schematic diagram of the structure of a prefabricated continuous free-form glulam ceiling system after the glued laminated timber main panel is assembled with the main structural steel beam in a staggered joint assembly.

[0055] Figure 7 A magnified schematic diagram of a partial detail of the assembly of the glued laminated timber main panel with the main structural steel beam in a prefabricated continuous free-form surface glued laminated timber ceiling system provided for an embodiment of the present invention.

[0056] Figure 8A partial enlarged structural diagram of the main structural steel beam in a prefabricated continuous freeform glued laminated timber ceiling system provided for an embodiment of the present invention;

[0057] Figure 9 An exploded structural diagram of a concealed F-shaped metal connector in a prefabricated continuous free-form glued laminated timber ceiling system provided as an embodiment of the present invention.

[0058] The serial numbers in the diagram are as follows:

[0059] 1. Roof panel; 2. Main structural steel beam; 3. Steel column flange; 4. Concealed F-shaped metal connector; 5. Dovetail tenon; 6. Glulam main panel; 7. Base column; 8. Lower connecting flange; 9. Upper connecting flange. Detailed Implementation

[0060] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0061] like Figure 1 and Figure 2 As shown, this embodiment provides a prefabricated continuous free-form glued laminated timber ceiling system, including a roof panel 1, a main structural steel beam 2, steel column flanges 3, concealed F-shaped metal connectors 4, dovetail tenons 5, glued laminated timber main panels 6, and base columns 7.

[0062] The roof panel 1 is installed on the main structural steel beam 2. The main structural steel beam 2 is welded to the steel column flange 3 as a whole and connected to the bottom column 7 through the steel column flange 3. The lower surface of the steel column flange 3 adopts a horizontal structure to form a reference surface for ceiling installation. The steel column flange 3 is not only used to connect the main structural steel beam 2 and the bottom column 7, but also serves as a unified reference interface for the installation of the ceiling system, enabling the ceiling module to be quickly positioned during installation and reducing on-site leveling and adjustment procedures.

[0063] like Figures 7 to 9 As shown, the glued laminated timber (GLLT) main panel 6 is connected to the main structural steel beam 2 via concealed F-shaped metal connectors 4. The lower surface of the GLLT main panel 6 adopts a continuous free-form ceiling interface that matches the roof panel 1 and the main structural steel beam 2. The geometry and segmentation of the GLLT main panel 6 are determined during the design phase based on the requirements of overall hoisting and modular assembly, ensuring that the components form a clear assembly logic before leaving the factory, rather than relying on secondary adjustments on-site to complete the curved surface splicing.

[0064] Furthermore, such as Figures 3 to 6As shown, in this embodiment, the glued laminated timber main panel 6 is assembled from multiple glued laminated timber components. The multiple glued laminated timber main panels 6 have irregular lengths and are spliced ​​in a staggered manner during overall assembly. The end splices of two adjacent columns or rows of glued laminated timber main panels 6 are staggered, so that the entire continuous free-form ceiling interface does not form a continuous straight splice.

[0065] In this multi-piece glued laminated timber (GLLT) component, the splicing positions between adjacent GLLT main panels 6 are connected by dovetail tenons 5, which are used to achieve the assembly connection of adjacent GLLT components. The dovetail tenons 5 are customized according to the spatial position of each GLLT component in the overall free-form surface, and their geometric shape corresponds one-to-one with the assembly direction, thereby forming a self-aligning and assembly guidance relationship during the assembly process, reducing the degree of manual intervention.

[0066] Furthermore, in this embodiment, the concealed F-shaped metal connector 4 includes a vertical surface and a horizontal surface. The vertical surface is fixed to the main structural steel beam 2 by screws, and the horizontal surface is fixedly disposed on the back of the glued laminated timber main panel 6 to realize the connection between the glued laminated timber main panel 6 and the main structural steel beam 2. Specifically, the concealed F-shaped metal connector 4 includes a vertical mounting plate and an upper connecting wing plate 9 and a lower connecting wing plate 8 extending from the same side of the vertical mounting plate; the vertical mounting plate is the vertical surface, which is attached to and fixed to the side of the main structural steel beam 2 by connectors; the extending direction of the upper connecting wing plate and the lower connecting wing plate is parallel to the tangent direction of the curved surface of the glued laminated timber main panel 6 at its corresponding connection node; the upper connecting wing plate 9 and the lower connecting wing plate 8 are inserted into and embedded in the stepped geometric structure pre-processed on the back of the glued laminated timber main panel 6, and are concealedly fastened to the glued laminated timber main panel 6 from the back by fasteners.

[0067] The concealed F-shaped metal connector 4 is pre-installed in the factory according to the spatial position of the component. Its connection interface is processed by industrial robots to form a precise installation position, so that the connector has both connection function and assembly positioning function, and is not exposed on the visible surface of the ceiling after installation.

[0068] In addition, this embodiment also provides a prefabricated continuous free-form glued laminated timber ceiling system and its construction method, including the following steps:

[0069] Step S1: Rough processing of the back of the glued laminated timber:

[0070] Fix the glued laminated timber blank to be processed at the processing station with its back facing the industrial robot processing tool;

[0071] The industrial robot performs rough processing on the back of the glued laminated timber main panel 6 according to the pre-set processing path. The back is the side that is not visible after the ceiling system is installed. Excess material is removed and a stepped geometric structure is formed to reserve space for the subsequent installation of the hidden F-shaped metal connector 4.

[0072] The rough machining on the back side employs a layered subtractive machining approach to improve machining efficiency and control material removal, thus creating a stable geometric foundation for subsequent node machining and connector installation. Step S2: Dovetail and node interface machining:

[0073] After completing the rough processing on the back, the edges and designated locations of the glued laminated timber main panel 6 are processed for joints, including:

[0074] Processing of dovetail tenons 5 between adjacent glued laminated timber main panels 6;

[0075] Processing of node slots or mounting interfaces for installing concealed F-shaped metal connectors 4;

[0076] The dovetail joint 5 and the node interface are customized according to the assembly position of the glued laminated timber main panel 6 in the overall free-form surface;

[0077] The aforementioned node machining and component geometry machining are completed continuously within the same industrial robot system, achieving integrated manufacturing of freeform surface shapes and assembly nodes, and avoiding error accumulation caused by switching between multiple devices.

[0078] Step S3: Turning and rough processing of the front side of the glued laminated timber:

[0079] The glued laminated timber main panel 6, after the back and node processing is completed, is flipped so that its front faces the industrial robot processing tool; the front of the glued laminated timber main panel 6 is roughly processed to make it close to the target free-form surface shape.

[0080] Step S4: Precise processing of the front side of the glued laminated timber:

[0081] After the rough processing of the front side is completed, the front side of the glued laminated timber main panel 6 is precisely processed to form the final free-form surface shape, so as to meet the requirements of the ceiling system for surface continuity and splicing accuracy.

[0082] By using the above-mentioned multi-stage processing method, the accuracy of the freeform surface shape and the assembly accuracy of the nodes can be controlled by the factory manufacturing stage, thereby reducing the need for on-site manual adjustment from a technical perspective.

[0083] In addition, this embodiment also provides a factory prefabrication and construction method for a prefabricated continuous free-form plywood ceiling system, including the following steps:

[0084] Step S11, Installation of metal connectors:

[0085] In the factory, the concealed F-shaped metal connector 4 is installed to the corresponding position on the back or inside of the finished glued laminated timber body panel 6, and the concealed F-shaped metal connector 4 is fixed to the glued laminated timber body panel 6 with screws.

[0086] This installation process is completed in the factory, ensuring that the relative positional relationship between the glued laminated timber main panel 6 and the main structural steel beam 2 is fixed as a repeatable assembly relationship before leaving the factory.

[0087] Step S12, Ceiling module assembly:

[0088] The glued laminated timber main panel 6, which is equipped with concealed F-shaped metal connectors 4, is assembled with the main structural steel beam 2, so that the glued laminated timber main panel 6 and the main structural steel beam 2 form a stable assembly relationship through the concealed F-shaped metal connectors 4.

[0089] After the dovetail joints 5 are assembled between adjacent glued laminated timber main panels 6, the adjacent glued laminated timber main panels 6 are glued together as a whole to form a continuous free-form ceiling module.

[0090] By bonding the entire structure together to form an integrated ceiling module, the on-site construction phase is transformed from "piece-by-piece installation and adjustment" to "overall hoisting and fixed connection".

[0091] Step S13, Transportation and On-site Overall Lifting:

[0092] The free-form ceiling modules, which are assembled and glued in the factory, will be transported to the construction site.

[0093] The entire structure is hoisted using lifting points set on the main structural steel beam 2.

[0094] After hoisting, the steel column flange 3 on the main structural steel beam 2 is connected to the bottom column 7 to fix the free-form glulam ceiling system to the main building structure; the roof panel 1 is fixedly installed on the main structural steel beam 2.

[0095] During the on-site construction phase, only the hoisting, positioning, and flange bolt connection procedures need to be completed, which significantly reduces the complexity of high-altitude operations and improves the stability of the construction cycle and the consistency of installation accuracy.

[0096] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0098] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prefabricated continuous free-form glued laminated timber ceiling system, characterized in that, Includes roof panels (1), main structural steel beams (2), steel column flanges (3), concealed F-shaped metal connectors (4), dovetail tenons (5), glued laminated timber main panels (6), and base columns (7); The roof panel (1) is set on the main structural steel beam (2), the main structural steel beam (2) is welded to the steel column flange (3) as a whole, and is connected to the bottom column (7) through the steel column flange (3). The lower surface of the steel column flange (3) adopts a horizontal structure to form a ceiling installation reference surface. The glued laminated timber main panel (6) is connected to the main structural steel beam (2) by a hidden F-shaped metal connector (4) and fasteners. The lower surface of the glued laminated timber main panel (6) adopts a continuous free-form ceiling interface that matches the roof panel (1) and the main structural steel beam (2). The glued laminated timber main panel (6) is assembled from multiple glued laminated timber components. The splicing positions between adjacent glued laminated laminated timber main panels (6) among the multiple glued laminated timber components are connected by the dovetail tenon (5) to realize the assembly connection of adjacent glued laminated timber components. The multiple glued laminated timber main panels (6) are of irregular length and are spliced ​​in a staggered manner during overall assembly; the end splices of two adjacent columns or two rows of glued laminated timber main panels (6) are staggered from each other, so that the entire continuous free-form ceiling interface does not form a continuous straight splice.

2. The prefabricated continuous free-form glued laminated timber ceiling system according to claim 1, characterized in that, The concealed F-shaped metal connector (4) includes a vertical surface and a horizontal surface. The vertical surface is fixed to the main structural steel beam (2) by screws, and the horizontal surface is fixedly set on the back of the glued laminated timber main panel (6) to realize the connection between the glued laminated timber main panel (6) and the main structural steel beam (2).

3. The prefabricated continuous free-form glued laminated timber ceiling system according to claim 2, characterized in that, The back of the glued laminated timber main panel (6) has a stepped geometric structure pre-processed; the vertical surface includes a vertical mounting plate, and the horizontal surface includes an upper connecting wing plate (9) and a lower connecting wing plate (8) extending from the same side of the vertical mounting plate to form an F-shaped structure; the vertical mounting plate is attached to and fixed to the side of the main structural steel beam (2) by a connector; the extension direction of the upper connecting wing plate (9) and the lower connecting wing plate (8) is consistent with the extension direction of the stepped geometric structure on the back of the glued laminated timber main panel (6) used to accommodate the connector; the upper connecting wing plate (9) and the lower connecting wing plate (8) are inserted into and embedded in the stepped geometric structure pre-processed on the back of the glued laminated timber main panel (6), and are concealed and fastened to the glued laminated timber main panel (6) from the back by fasteners.

4. A construction method for a prefabricated continuous free-form glued laminated timber ceiling system according to any one of claims 1-3, characterized in that, Includes the following steps: Step S1: Rough processing of the back of the glued laminated timber: Fix the glued laminated timber blank to be processed at the processing station with its back facing the industrial robot processing tool; The industrial robot performs rough processing on the back of the glued laminated wood main panel (6) according to the pre-set processing path. The back is the side that is not visible after the ceiling system is installed. It removes excess material and forms a stepped geometric structure to reserve space for the subsequent installation of the hidden F-shaped metal connector (4). Step S2, dovetail tenon and joint interface processing: After completing the rough processing on the back, the edges of the glued laminated timber main panel (6) are processed to create joints, including: Processing of dovetail tenons (5) between adjacent glued laminated timber main panels (6); The stepped geometry is processed for installing the concealed F-shaped metal connector (4); the dovetail tenon (5) and the node interface are customized according to the assembly position of the glued laminated timber main panel (6) in the overall free-form surface; Step S3: Turning and rough processing of the front side of the glued laminated timber: The glued laminated timber main panel (6) with the back and nodes processed is flipped over so that its front faces the industrial robot processing tool; the front of the glued laminated timber main panel (6) is rough processed to make it close to the target freeform surface shape; Step S4: Precise processing of the front side of the glued laminated timber: After the rough processing of the front side is completed, the front side of the glued laminated wood main panel (6) is precisely processed to form the final free-form surface shape, so that it meets the requirements of the ceiling system for surface continuity and splicing accuracy.

Images