Installation and construction method for overhanging type GRG suspended ceiling

Abstract

The invention discloses an installation construction method for a cantilever type GRG ceiling. The installation construction method comprises the following steps that firstly, a three-dimensional model of the cantilever type ceiling is established according to a design drawing; 2, surveying and setting out are conducted in the building structure according to the design drawing; 3, constructing the front surface of the suspended ceiling cantilever section; fourthly, the flat-top concave framework and the back face of the suspended ceiling cantilever section are constructed; 5, installation ending is carried out; through systematic construction steps and special structural design, the technical problem of mounting the large-area irregular GRG suspended ceiling in the tall and large space is effectively solved, and the method has the advantages that the construction efficiency is improved, the construction quality is ensured, and the structural stability and safety are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of building decoration engineering, and in particular to an installation construction method for a cantilevered GRG ceiling. Background Art

[0002] GRG is a precast glass fiber reinforced gypsum board. It is a special decorative modified fiber gypsum decorative material with the characteristics of strong randomness of shape, so it has become the first choice for architects who pursue personalized design. In decoration and renovation projects, GRG finishes are increasingly used in large conference centers, concert halls, lecture halls and other public spaces with special requirements for sound effects. These spaces are usually tall and require the installation of large-area irregularly shaped GRG ceilings.

[0003] However, there are some problems with the installation process of large-area irregular GRG ceilings in tall spaces. Due to the irregular shape of the GRG board unit, the use of conventional technology not only increases the difficulty of construction, but also increases labor costs invisibly. During the installation process, if the positioning is improper, it is easy to cause misalignment, affecting the final decorative effect. These problems make it difficult to control the quality of the project well, and are also not conducive to completing the construction progress on time.

[0004] However, the connection between the prefabrication and on-site installation of GRG panel units in the prior art is not tight enough. This may cause the prefabricated panels to be inconsistent with the actual situation on site, increase the workload of on-site adjustment and modification, and affect construction efficiency; at the same time, when dealing with the connection between the cantilevered GRG ceiling and the main structure of the building, there is a lack of effective transfer layer design, which may cause uneven stress on the ceiling structure, affecting the safety and stability of long-term use. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an installation construction method for a cantilevered GRG ceiling, which has the advantages of improving construction efficiency, ensuring construction quality, and enhancing structural stability and safety.

[0006] The present invention provides a method for installing a cantilevered GRG ceiling, comprising the following steps:

[0007] Step 1: Create a 3D model of the cantilever ceiling according to the design drawings, divide the 3D model into several GRG plate units and assign corresponding numbers, and then determine the installation position and size of each GRG plate unit and its position relationship with the building structure;

[0008] Step 2: Measure and lay out the lines in the building structure according to the design drawings, and set up the transition layer frame between the building structure and the ceiling installation position;

[0009] Step 3: For the front construction of the suspended ceiling section, each GRG plate unit is hoisted to the bottom of the transfer layer frame according to the marked position, and a temporary screw rod is set on the transfer layer frame to temporarily fix the GRG plate unit and the transfer layer frame and adjust the positioning; after each GRG plate unit is assembled to form the overall suspended ceiling, the front keel of the cantilever section is welded on the back of the GRG plate unit in sequence to complete the front construction of the cantilever section;

[0010] Step 4: Construct the concave frame of the flat roof and the back of the suspended ceiling section. First, construct the concave frame near the suspended ceiling end of the flat roof, and use the back keel of the cantilever section to connect the concave frame and the front keel of the cantilever section and make the keel at the cantilever section a "V" shape. Finally, install decorative panels on the concave frame and the back keel of the cantilever section to complete the decorative construction of the concave decorative layer and the back of the cantilever section.

[0011] Step 5: Finish the installation by trimming and painting the outer surfaces of each GRG panel unit and decorative panel.

[0012] Furthermore, in step one, the GRG board unit is obtained by prefabrication in a factory.

[0013] Furthermore, when the GRG plate unit is formed, a connection part for assisting the installation of the GRG plate unit with the transition layer frame or the front keel of the cantilever section is pre-buried inside, and the connection part is arranged on the back of the GRG plate unit.

[0014] Furthermore, in step 2, the conversion layer skeleton is constructed in layers to ensure the installation of water, electricity and air ducts.

[0015] Furthermore, in step three, adjacent GRG plate units are connected and fixed by tension bolts, and gaps for subsequent finishing and painting operations are provided between adjacent GRG plate units, and the gaps are filled with GRG gypsum powder to prevent cracking.

[0016] Furthermore, the temporary screw rod is used to position and adjust the GRG plate unit, and the upper end of the temporary screw rod is connected to the conversion layer skeleton and the lower end is connected to the GRG plate unit.

[0017] Furthermore, the temporary screw rod is removed after the GRG plate unit is positioned and welded and fixed to the front keel of the cantilever section.

[0018] Further, in step four, the concave frame is located on the flat roof below the conversion layer close to the suspended ceiling section, and the concave frame is used to connect the flat roof and the suspended ceiling section.

[0019] Furthermore, the bottom of the back keel of the cantilevered section is connected and fixed to the bottom of the front keel of the cantilevered section, and the top of the back keel of the cantilevered section is connected and fixed to the end of the top of the concave frame close to the cantilevered ceiling.

[0020] Furthermore, the construction of the concave decorative layer and the decorative panel on the back of the cantilevered section needs to be completed after the construction of the GRG panel unit is completed.

[0021] The present invention has the following beneficial effects: the construction method of the present invention establishes a three-dimensional model according to the design drawings, sets a transition layer skeleton, constructs the front of the suspended ceiling cantilever section, constructs the back of the flat roof concave skeleton and the suspended ceiling cantilever section, and performs installation finishing. Through systematic construction steps and special structural design, the technical problem of installing a large-area irregularly shaped GRG suspended ceiling in a tall space is effectively solved, and the construction efficiency is improved, the construction quality is ensured, and the structural stability and safety are enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 It is a schematic diagram of the overall structure of the cantilevered GRG ceiling in the present invention;

[0024] Figure 2 It is a schematic diagram of the connection between the suspended ceiling section and the flat roof concave frame in the present invention;

[0025] Explanation of the reference numerals: 1-building structure; 2-transition layer frame; 3-flat roof; 4-recessed frame; 5-front keel of cantilever section; 6-GRG board unit; 7-rear keel of cantilever section; 8-decorative panel. DETAILED DESCRIPTION

[0026] The present application proposes an installation construction method for a cantilevered GRG ceiling, comprising the following steps: establishing a three-dimensional model of the cantilevered ceiling according to the design drawings, dividing the three-dimensional model into a number of GRG plate units 6 and correspondingly numbering them, and then determining the installation position and size of each GRG plate unit 6 and its positional relationship with the building structure 1; measuring and laying out lines in the building structure 1 according to the design drawings, and setting a transition layer skeleton 2 between the building structure 1 and the ceiling installation position; constructing the front side of the cantilevered section of the ceiling, hoisting each GRG plate unit 6 one by one according to the numbered position to the bottom of the transition layer skeleton 2, and setting a temporary screw on the transition layer skeleton 2 to achieve temporary fixation of the GRG plate unit 6 and the transition layer skeleton 2. Adjust the positioning; after each GRG plate unit 6 is assembled to form an integral ceiling, weld the cantilever section back keel 75 in sequence on the back of the GRG plate unit 6 to complete the front construction of the cantilever section; construct the concave skeleton 4 of the flat roof 3 and the back of the ceiling cantilever section, first construct the concave skeleton 4 at the position of the flat roof 3 near the cantilever end of the ceiling, and use the cantilever section back keel to connect the concave skeleton 4 and the cantilever section back keel 75 to make the keel at the cantilever section present a "V" shape structure, finally install the decorative panel 8 on the concave skeleton 4 and the cantilever section back keel to complete the decorative construction of the concave decorative layer and the back of the cantilever section; at the end of the installation, trim and paint the outer surfaces of each GRG plate unit 6 and the decorative panel 8.

[0027] The three-dimensional model can be established through BIM software, in which the division of GRG plate unit 6 needs to take into account transportation and hoisting restrictions, and the weight of a single unit should be controlled within 200kg. The transition layer skeleton 2 can adopt a steel truss structure, and a space of more than 50mm should be reserved for pipeline installation during its layered construction. Temporary screw rods can adopt M12 galvanized screw rods, and their lower ends are connected to the GRG unit through special clamps. The keel 75 on the back of the cantilever section should adopt 40×40×3mm galvanized square tubes, and the welding spacing should not exceed 600mm. The angle of the "V"-shaped keel should be controlled between 90-120 degrees to ensure structural stability. The decorative panel 8 can be made of 3mm thick aluminum plate and fixed to the keel with self-tapping screws.

[0028] This method solves the problem of irregular GRG ceiling construction through modular prefabrication and precise positioning installation. Three-dimensional modeling and unit division realize the decomposition of complex shapes. The conversion layer skeleton 2 provides a stable support system for irregular units. The temporary screw rod and "V"-shaped keel structure ensure the installation accuracy. Compared with traditional processes, the standardized construction process of this method can reduce the workload of on-site adjustments, the unitized installation method reduces the difficulty of high-altitude operations, and the keel system design effectively disperses the cantilever structure load.

[0029] In this embodiment, the GRG plate unit 6 is obtained by prefabrication in the factory. Specifically, the factory prefabrication includes the following implementation methods: using CNC machine tools to accurately cut and shape the GRG raw materials, wherein the raw materials are made of α-type semi-hydrated gypsum, glass fiber mesh cloth and additives mixed in a proportion; the plate unit is formed into a predetermined curved surface shape by a mold casting method, wherein the mold is made by CNC processing or 3D printing according to the three-dimensional model data; the temperature and humidity are controlled in the curing kiln for curing, and the curing cycle is 72 hours; after molding, the size is checked by a three-dimensional scanner, and the tolerance is controlled within the range of ±1.5mm. As a preferred embodiment, the connection part can be embedded simultaneously in the prefabrication stage, specifically by integrally casting and molding galvanized steel embedded parts and glass fiber reinforced gypsum.

[0030] Therefore, this technical solution solves the problem of insufficient on-site processing accuracy through factory prefabrication. Since the GRG unit completes the main body production in a controlled environment, it avoids material deformation caused by changes in ambient temperature and humidity at the construction site. At the same time, CNC processing ensures the dimensional accuracy of special-shaped components. The setting of the embedded connection part during the prefabrication process allows for quick positioning during subsequent installation, reducing the amount of on-site welding work. Compared with on-site manual production, this method reduces the joint error from the conventional ±5mm to within ±2mm, significantly improving the overall flatness of the ceiling.

[0031] In this embodiment, the GRG sheet unit 6 is pre-embedded with a connection part for assisting the installation of the GRG sheet unit 6 with the transition layer skeleton 2 or the back keel 75 of the cantilever section during molding, and the connection part is arranged on the back of the GRG sheet unit 6. The connection part can be in the form of a pre-embedded steel plate, a threaded sleeve or an anchor, wherein the pre-embedded steel plate is connected to the transition layer skeleton 2 or the back keel 75 of the cantilever section by welding; the threaded sleeve is detachably connected by bolts; the anchor is mechanically fixed by chemical anchor bolts or expansion bolts. Specifically, the connection part is accurately pre-embedded to a depth of 15-20mm on the back of the GRG sheet through a positioning mold during the factory prefabrication stage, and the pre-embedded position is determined according to the calculation results of the three-dimensional model. As a preferred embodiment, the connection part is made of galvanized steel plate with a thickness of 3-5mm and a mounting hole of Φ8-12mm on the surface. This technical solution completes the accurate pre-embedding of the connection part during the factory prefabrication stage, so that the preset connection point can be directly used for positioning and installation during on-site installation. This solves the problem of difficult on-site positioning of the GRG unit and difficult to ensure installation accuracy in the prior art. Specifically, the embedded connection is completely matched with the 3D model data, avoiding structural damage caused by secondary openings on site; the standardized connection interface simplifies the hoisting process, increasing the installation efficiency of irregular-shaped units by more than 30%; the back connection design maintains the integrity of the finish and reduces the workload of later repairs. This solution is particularly suitable for the installation of GRG units in complex spatial locations such as cantilever sections. Through the coordination of factory prefabrication and on-site assembly, the precision and efficiency of special-shaped ceiling construction are simultaneously improved.

[0032] In this embodiment, a layered construction method is adopted during the construction of the transition layer skeleton 2 to ensure the installation space of the water and electricity pipelines and the air duct pipelines. Specifically, the transition layer skeleton 2 is composed of a main keel and a secondary keel. The main keel is fixed to the building structure 1 by expansion bolts, and the secondary keel forms a layered structure with the main keel through a connector. As a preferred embodiment, a shock-absorbing gasket can be arranged between the main keel and the building structure 1 to reduce vibration conduction, and the spacing between the secondary keels is adjusted to 600-800mm according to the pipeline arrangement requirements. The water and electricity pipelines and the air duct pipelines can be laid in the skeleton space of different levels respectively, among which the water supply and drainage pipelines are preferentially arranged in the lower skeleton, the electrical wire pipes are arranged in the middle skeleton, and the air duct system is arranged in the upper skeleton. As a result, each professional pipeline can be arranged in layers to avoid cross interference. This technical solution solves the problem of comprehensive arrangement of pipelines in the construction of GRG ceilings in large spaces through a layered skeleton design. In the prior art, due to the complex shape of the GRG ceiling and the high installation accuracy requirements, the conflict between the pipeline and the skeleton will lead to positioning deviation or rework. After adopting this solution, pipeline installation and frame construction can be carried out simultaneously. The water and electricity pipelines are pre-buried in the lower layer of the frame to avoid grooving later, and the air ducts are installed in the upper layer of the frame for easy inspection and maintenance. Layered construction not only ensures the precise positioning of the GRG unit, but also improves the efficiency of pipeline installation. It is especially suitable for public building ceiling projects that require integrated electromechanical systems.

[0033] In this embodiment, during the front construction of the suspended ceiling section, adjacent GRG sheet units 6 are connected and fixed by tension bolts, and gaps for subsequent finishing and painting operations are set between adjacent GRG sheet units 6, and the gaps are filled with GRG gypsum powder to prevent cracking. Specifically, the tension bolts can be stainless steel bolts of M6-M10 specifications, and the bolt spacing is controlled within the range of 300-500mm. The gap width between adjacent sheet units should be 5-8mm, and the GRG gypsum powder needs to be compacted in layers when filling the gaps, and the thickness of each layer does not exceed 3mm. As a preferred embodiment, masking paper needs to be pasted on both sides of the gap to protect the surface of the sheet before filling the gaps, and a special scraper is used to smooth the gaps after the filling is completed. Therefore, the technical solution effectively solves the problem of positioning accuracy during the installation of irregular GRG sheets by setting an adjustable connection method and reserving a process gap. The tension bolt connection method not only ensures the stability of the installation, but also facilitates fine-tuning and positioning; the reserved gap cooperates with the GRG gypsum powder filling process to provide operating space for subsequent surface treatment, while avoiding the problem of cracking of the joints caused by material shrinkage. Compared with the traditional direct fixing method, this solution significantly improves the installation accuracy and surface finish quality of large-area irregular GRG ceilings.

[0034] In this embodiment, a temporary screw rod is used to position and adjust the GRG sheet unit 6. The upper end of the temporary screw rod is connected to the transition layer skeleton 2 and the lower end is connected to the GRG sheet unit 6. The temporary screw rod is removed after the GRG sheet unit 6 is positioned and welded to the back keel 75 of the cantilever section. The temporary screw rod can be made of threaded steel rod or galvanized steel rod, and the rod diameter is selected according to the weight of the GRG sheet unit 6, usually 8-12mm. The upper end of the screw rod is fixed to the reserved hole position of the transition layer skeleton 2 by a nut, and the lower end is temporarily fixed to the embedded connection part on the back of the GRG sheet unit 6 by a special clamp. As another embodiment, an adjusting nut can be set at the lower end of the screw rod, and the height of the GRG sheet unit 6 can be fine-tuned by rotating the nut. The length of the screw rod is determined according to the height of the ceiling, and is generally 10-15cm longer than the actual installation height for easy adjustment. This technical solution achieves precise positioning and temporary fixation of the GRG sheet unit 6 by setting a detachable temporary screw rod system. During the construction process, the screw rod can be adjusted in three dimensions to ensure that each unit board is precisely positioned; after the permanent fixation is completed, the screw rod is removed to ensure installation accuracy and avoid exposure of permanent connectors. Compared with the traditional direct welding fixation method, this solution solves the problem of high-altitude positioning difficulties of irregular GRG unit boards, reduces the difficulty of manual adjustment, and improves construction efficiency through standardized connection methods. Specifically, the temporary screw rod system provides stable temporary support for the GRG unit, allowing construction personnel to focus on plate seam docking and welding operations, effectively avoiding the problem of misaligned seams caused by positioning deviations.

[0035] In this embodiment, the temporary screw rod is removed after the GRG plate unit 6 is positioned and welded to the back keel 75 of the cantilever section. As a positioning and adjustment tool, the timing of its removal directly affects the construction efficiency and structural stability. The following methods can be used in specific implementation: the screw rod is made of Q235 carbon steel with a diameter range of 8-12mm, and an adjustable connection is achieved with the transfer layer skeleton 2 through a threaded sleeve; the removal operation requires the use of a special wrench to rotate the nut at the bottom of the screw rod counterclockwise, and the connection is completely loosened and then vertically pulled out. This technical solution avoids mechanical interference between the temporary structure and the permanent keel system while ensuring the precise positioning of the GRG unit by accurately controlling the removal sequence of the temporary support components. Specifically, when the back keel 75 of the cantilever section is welded, the GRG unit has formed a stable spatial positioning system. At this time, the removal of the temporary screw rod can not only release the influence of the construction load on the transfer layer skeleton 2, but also prevent the stress concentration problem caused by the long-term retention of the temporary support. Compared with the positioning offset caused by premature removal or the structural conflict caused by late removal in the traditional process, this solution has significant advantages in construction accuracy and structural safety.

[0036] In this embodiment, in step four, the concave skeleton 4 is located at the flat roof 3 below the conversion layer, close to the position of the suspended ceiling section, and the concave skeleton 4 is used to connect the flat roof 3 and the suspended ceiling section. The concave skeleton 4 can be made of light steel keel or aluminum alloy keel, and its cross-sectional shape can be designed to be U-shaped, C-shaped or L-shaped according to actual needs. As a preferred embodiment, the concave skeleton 4 is fixed to the building structure 1 by expansion bolts or chemical anchors to ensure its bearing stability. Specifically, the installation position of the concave skeleton 4 needs to be accurately determined according to the calculation results of the three-dimensional model to ensure the connection accuracy with the keel 75 on the back of the suspended section. For example, a connecting ear plate can be set at the top of the concave skeleton 4 to facilitate welding or bolting with the keel on the back of the suspended section. This technical solution effectively solves the transition connection problem between the flat roof 3 and the suspended section in the GRG suspended ceiling in a large space by setting a special concave skeleton 4 structure. Among them, the positioning and installation of the concave frame 4 is based on the previous three-dimensional modeling data to ensure the construction accuracy; its structural design takes into account the connection requirements with the cantilevered keel, so that the entire ceiling system forms a stable mechanical transmission path. Compared with the existing technology, this solution significantly improves the installation efficiency of irregular GRG ceilings, avoids the common joint misalignment problem in traditional processes, and provides reliable base support for the subsequent decoration layer construction.

[0037] In this embodiment, the bottom of the cantilever section back keel is connected and fixed to the bottom of the cantilever section back keel 75, and the top of the cantilever section back keel is connected and fixed to the end of the top of the inner concave frame 4 near the cantilever type ceiling. The cantilever section back keel can be made of angle steel or square steel pipe, and its cross-sectional size is determined according to load calculation. The connection and fixing methods include but are not limited to welding, bolt connection or special connection parts. As a preferred embodiment, a reinforcing plate is set at the connection between the cantilever section back keel and the cantilever section back keel 75 to improve the node strength. The connection position of the inner concave frame 4 and the cantilever section back keel can be provided with embedded parts or fixed by post-anchoring. Specifically, the installation angle of the cantilever section back keel can be adjusted within the range of 30-60 degrees according to actual engineering requirements to form a stable "V"-shaped support structure. This technical solution effectively enhances the overall stability of the cantilever section ceiling by forming a rigid connection between the cantilever section back keel and the front keel and the inner concave frame 4. Among them, the bottom connection can ensure the effective transfer of load, and the top connection provides the necessary lateral constraints. This solves the deformation problem of the cantilever section of the GRG ceiling caused by insufficient support in the prior art, and simplifies the construction process. Compared with the conventional single-layer keel support, the "V"-shaped double keel structure significantly improves the bending stiffness and bearing capacity of the cantilever section, which is conducive to ensuring the installation accuracy and long-term safety of large-area irregular-shaped GRG ceilings.

[0038] In this embodiment, the construction of the decorative panel 8 on the back of the concave decorative layer and the cantilever section must be completed after the construction of the GRG plate unit 6 is completed. Specifically, the installation process of the decorative panel 8 is clearly defined to be carried out after all the GRG plate units 6 are installed in place. This process arrangement is achieved in the following way: after the welding and fixation of the keel 75 on the back of the cantilever section, the GRG unit joints are processed and the surface is trimmed first, and the decorative layer construction is implemented after the main structure of the ceiling is completely formed. The decorative panel 8 can be made of aluminum plate, stainless steel plate or GRG homogeneous material, and is fixed to the concave skeleton 4 and the keel on the back of the cantilever section by bolt connection or gluing. Among them, elastic gaskets can be set at the connection nodes between the decorative panel 8 and the keel to absorb structural deformation, and 3-5mm expansion joints can be reserved at the joints of the decorative panel 8 and treated with flexible sealant.

[0039] This technical solution effectively solves the problem of misalignment and deformation of the decorative surface layer of the special-shaped GRG ceiling by strictly stipulating the construction sequence. Placing the decorative construction after the completion of the structural layer can ensure the structural stability of the reference surface of the decorative surface layer and avoid secondary damage to the decorative surface caused by the adjustment of the GRG unit. At the same time, this process arrangement enables the decorative construction to accurately refer to the completed structural dimensions for lofting, thereby improving the matching accuracy of the decorative surface layer and the structural layer. Compared with the cross-operation method of the structural layer and the decorative layer in the prior art, this solution significantly reduces the installation error caused by process interference, which is conducive to ensuring the integrity and aesthetics of the final decorative effect.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for installing a cantilevered GRG ceiling, characterized in that: The following steps are involved: Step 1: Create a 3D model of the cantilever ceiling according to the design drawings, divide the 3D model into several GRG plate units and assign corresponding numbers, and then determine the installation position and size of each GRG plate unit and its position relationship with the building structure; Step 2: Measure and lay out the lines in the building structure according to the design drawings, and set up the transition layer frame between the building structure and the ceiling installation position; Step 3: For the front construction of the suspended ceiling section, each GRG plate unit is hoisted to the bottom of the transfer layer frame according to the marked position, and a temporary screw rod is set on the transfer layer frame to temporarily fix the GRG plate unit and the transfer layer frame and adjust the positioning; after each GRG plate unit is assembled to form the overall suspended ceiling, the front keel of the cantilever section is welded on the back of the GRG plate unit in sequence to complete the front construction of the cantilever section; Step 4: Construct the concave frame of the flat roof and the back of the suspended ceiling section. First, construct the concave frame near the suspended ceiling end of the flat roof, and use the back keel of the cantilever section to connect the concave frame and the front keel of the cantilever section and make the keel at the cantilever section a "V" shape. Finally, install decorative panels on the concave frame and the back keel of the cantilever section to complete the decorative construction of the concave decorative layer and the back of the cantilever section. Step 5: Finish the installation by trimming and painting the outer surfaces of each GRG panel unit and decorative panel.

2. The installation construction method for cantilevered GRG ceiling according to claim 1 is characterized in that: In step one, the GRG panel unit is prefabricated in a factory.

3. The installation construction method for cantilevered GRG ceiling according to claim 2 is characterized in that: When the GRG plate unit is formed, a connection part for assisting the installation of the GRG plate unit and the conversion layer frame or the front keel of the cantilever section is pre-buried inside, and the connection part is arranged on the back of the GRG plate unit.

4. The installation construction method for cantilevered GRG ceiling according to claim 1 is characterized in that: In step 2, the conversion layer skeleton is constructed in layers to ensure the installation of water, electricity and air ducts.

5. The installation construction method for cantilevered GRG ceiling according to claim 1 is characterized in that: In step three, adjacent GRG plate units are connected and fixed by tension bolts, and gaps are provided between adjacent GRG plate units for subsequent finishing and painting operations, and the gaps are filled with GRG gypsum powder to prevent cracking.

6. The installation construction method for cantilevered GRG ceiling according to claim 5 is characterized in that: The temporary screw rod is used to position and adjust the GRG plate unit. The upper end of the temporary screw rod is connected to the conversion layer skeleton and the lower end is connected to the GRG plate unit.

7. The installation construction method for cantilevered GRG ceiling according to claim 6 is characterized in that: The temporary screw rod is removed after the GRG plate unit is positioned and welded to the front keel of the cantilever section.

8. The installation construction method for cantilevered GRG ceiling according to claim 1 is characterized in that: In step four, the concave frame is located on the flat roof below the conversion layer close to the suspended ceiling section, and the concave frame is used to connect the flat roof and the suspended ceiling section.

9. The installation construction method for cantilevered GRG ceiling according to claim 8, characterized in that: The bottom of the back keel of the cantilevered section is connected and fixed to the bottom of the front keel of the cantilevered section, and the top of the back keel of the cantilevered section is connected and fixed to the end of the top of the concave frame close to the cantilevered ceiling.

10. The installation construction method for cantilevered GRG ceiling according to claim 8, characterized in that: The construction of the concave decorative layer and the decorative panels on the back of the cantilevered section must be completed after the construction of the GRG panel unit is completed.

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