Seamless large-area integral suspended ceiling structure for swimming pool environment and construction method thereof

By adopting a seamless large-area overall ceiling structure in humid environments such as swimming pools, combined with flexible inorganic cement boards, waterproof and breathable membranes and water-repellent coatings, the problems of leakage, cracking and mold in traditional ceiling structures are solved, and the problem of leakage, cracking and mold in traditional ceiling structures is achieved. High weather resistance and self-cleaning function ceiling system.

CN119466206APending Publication Date: 2025-02-18中建八局广西建设有限公司
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Patent Information

Application Number
CN202411416455.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-11
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

Traditional ceiling structures are prone to leakage, cracking, mold and other problems in humid environments such as swimming pools, which affect service life and aesthetics.

Method used

Adopt a seamless large-area overall ceiling structure, including keel layer, flexible inorganic cement board, waterproof and breathable membrane, polyurea grouting liquid, crack-resistant mesh cloth, cement-based polymer mortar layer and hydrophobic coating, combined with elastic deformation plate and expansion joint design to form a complete enclosed panel surface, adapting to the micro-deformation of the structure and preventing water vapor from entering.

Benefits of technology

Effectively prevent leakage, cracking and mold, improve the weather resistance and service life of the ceiling structure, ensure that water vapor does not enter the inner space of the ceiling, and provide self-cleaning function.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a seamless large-area integral suspended ceiling structure for a swimming pool environment and a construction method of the seamless large-area integral suspended ceiling structure. The seamless large-area integral suspended ceiling structure comprises a keel layer, the seamless ceiling board comprises a plurality of flexible inorganic cement boards, the flexible inorganic cement boards are laid at the bottom of the keel layer, waterproof breathable films are laid on the upper surfaces of the flexible inorganic cement boards, polyurea grouting liquid is poured into splicing seams of the flexible inorganic cement boards, and anti-crack gridding cloth is laid on the lower surfaces of the flexible inorganic cement boards. The lower surfaces of the multiple flexible inorganic cement boards are coated with cement-based polymer mortar layers, the outer sides of the cement-based polymer mortar layers are coated with hydrophobic coatings, and expansion joints are formed between the seamless ceiling board and the wall body. The middle part of the elastic deformation plate is bent to form a seepage groove. The problems that a traditional suspended ceiling structure is prone to leakage, cracking and mildewing in the using environment of the natatorium are solved.
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Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a seamless large-area integral ceiling structure for a swimming pool environment and a construction method thereof. Background Art

[0002] The internal environment of the swimming pool is humid and foggy. The traditional ceiling system is easily corroded by moisture, resulting in material aging, deformation, cracking and other problems, which seriously affect the service life and aesthetics. The ceiling structure faces severe challenges in waterproofing, moisture-proofing and mildew-proofing in humid environments such as swimming pools. Due to the high humidity and large temperature difference in the swimming pool, as well as the presence of corrosive gases such as water vapor and chlorine, traditional ceiling materials and structures are prone to leakage, cracking, mildew and other problems in this environment, affecting the service life and aesthetics.

[0003] In addition, traditional ceiling structures lack ventilation and air permeability, making it difficult for humid air inside to be discharged, increasing the risk of mildew.

[0004] In general, the existing technology still has shortcomings in terms of material cost, construction technology, service life, etc., and innovative breakthroughs are urgently needed. Summary of the invention

[0005] In order to overcome the defects of the prior art, a seamless large-area integral ceiling structure for a swimming pool environment and a construction method thereof are provided to solve the problems of leakage, cracking and mildew of the traditional ceiling structure in the use environment of a swimming pool.

[0006] To achieve the above purpose, a seamless large-area integral ceiling structure for a swimming pool environment is provided, comprising:

[0007] A keel layer, wherein the upper portion of the keel layer is connected to a plurality of suspension rods, and the suspension rods are hinged to the ceiling;

[0008] A seamless ceiling panel, comprising a plurality of flexible inorganic cement panels, wherein the plurality of flexible inorganic cement panels are laid at the bottom of the keel layer, a waterproof and breathable membrane is laid on the upper surface of the flexible inorganic cement panels, a polyurea grouting liquid is poured into the joint between two adjacent flexible inorganic cement panels, an anti-cracking mesh cloth is laid on the lower surface of the plurality of flexible inorganic cement panels, a cement-based polymer mortar layer is coated on the lower surface of the plurality of flexible inorganic cement panels, the cement-based polymer mortar layer is coated on the anti-cracking mesh cloth, a hydrophobic coating is coated on the outer side of the cement polymer mortar layer, and an expansion joint is formed between the seamless ceiling panel and the wall;

[0009] An elastic deformation plate is used to cover the expansion joint and is arranged along the length direction of the expansion joint. One side of the elastic deformation plate is anchored in the wall, and the other side of the elastic deformation plate is installed on the outer edge of the seamless ceiling panel. The middle part of the elastic deformation plate is bent to form a seepage groove.

[0010] Furthermore, two base plates arranged opposite to each other are installed on the ceiling, the two base plates are provided with a second through hole, the upper end of the suspension rod is movably arranged between the two base plates, the upper end of the suspension rod is provided with a second through hole, and hinge shafts are movably penetrated through the first through hole and the second through hole.

[0011] Furthermore, the first through-hole is strip-shaped and arranged in the vertical direction, and the two ends of the hinge shaft are movably provided with a sleeve, and the sleeve is pressed against the outer side of the base plate. The two ends of the hinge shaft are adjustably installed with fasteners, and the fasteners are pressed against the side of the sleeve away from the base plate.

[0012] Furthermore, the kit is welded to the outer side of the substrate.

[0013] Furthermore, a first anti-slip pattern is formed on a side of the kit facing the substrate, and a second anti-slip pattern is formed on an outer side of the substrate, and the first anti-slip pattern is engaged with the second anti-slip pattern.

[0014] Furthermore, the hydrophobic coating is a silicone resin composite exterior wall latex paint coating.

[0015] Furthermore, the other side of the elastic deformation plate is connected to an edge plate, and a accommodating groove is formed on the side of the edge plate away from the wall, and the outer edge of the seamless ceiling plate is embedded in the accommodating groove.

[0016] The present invention provides a construction method of a seamless large-area integral ceiling structure for a swimming pool environment, comprising the following steps:

[0017] Hinged multiple suspension rods on the ceiling;

[0018] Connecting the upper portion of the keel layer to the lower ends of the plurality of suspension rods;

[0019] Laying a plurality of flexible inorganic cement boards on the bottom of the keel layer respectively;

[0020] Laying a waterproof and breathable membrane on the upper surface of the flexible inorganic cement board;

[0021] Pouring polyurea grouting liquid into the joint between two adjacent flexible inorganic cement boards;

[0022] Laying anti-cracking mesh cloth on the lower surfaces of the plurality of flexible inorganic cement boards;

[0023] Coating a cement-based polymer mortar layer on the lower surfaces of the plurality of flexible inorganic cement boards so that the cement-based polymer mortar layer is coated on the anti-cracking mesh cloth;

[0024] Applying a hydrophobic coating on the outer side of the cement polymer mortar layer to form a seamless ceiling panel, and forming an expansion joint between the seamless ceiling panel and the wall;

[0025] One side of the elastic deformation plate is anchored in the wall, and the other side of the elastic deformation plate is installed on the outer edge of the seamless ceiling plate. The elastic deformation plate is arranged along the length direction of the expansion joint.

[0026] The beneficial effect of the present invention is that the seamless large-area integral ceiling structure for swimming pool environment of the present invention is suitable for swimming pool environment, and a flexible inorganic cement board is selected, and polyurea grouting liquid is used to fill the joints at the joints so that the flexible inorganic cement board in the entire space forms a complete closed board surface. The keel layer and the ceiling of the main structure are connected in a hinged form, so that the large-space seamless ceiling board can better adapt to the structural micro-deformation of the large space. An expansion joint is set between the seamless ceiling board and the vertical wall, and an elastic deformation plate is embedded, which is beneficial to the cumulative temperature and swelling deformation of the large-area seamless ceiling board for stress release, and at the same time forms a closed barrier on the entire plane to ensure that water vapor does not enter the internal space of the ceiling. The resin coating used in the hydrophobic coating has excellent hydrophobicity and weather resistance, ensuring the self-cleaning function of the large-area integral ceiling for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 The schematic diagram of the structure of a seamless large-area integral ceiling structure for a swimming pool environment according to an embodiment of the present invention.

[0029] Figure 2 It is a schematic structural diagram of the joints of the flexible inorganic cement board according to an embodiment of the present invention.

[0030] Figure 3 It is a schematic structural diagram of the expansion joint of a seamless large-area integral ceiling structure for a swimming pool environment according to an embodiment of the present invention.

[0031] Figure 4 Schematic diagram of the structure of an elastic deformation plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] Reference Figures 1 to 4 As shown, the present invention provides a seamless large-area integral ceiling structure for a swimming pool environment, comprising: a keel layer 1, a seamless ceiling board 2, and an elastic deformation board 3.

[0035] In this embodiment, the keel layer includes a transverse keel and a longitudinal keel. The transverse keel and the longitudinal keel are cross-arranged and fixedly connected together. The transverse keel and the longitudinal keel are made of square steel or angle steel or other shaped steel.

[0036] A plurality of suspension rods 11 are connected to the upper portion of the keel layer 1 . The suspension rods 11 are hinged to the ceiling 4 .

[0037] In this embodiment, see Figure 1 As shown, two base plates 12 arranged opposite to each other are installed on the ceiling 4. The two base plates 12 are provided with a second through hole. The upper end of the suspension rod 11 is movably arranged between the two base plates 12. The upper end of the suspension rod 11 is provided with a second through hole. A hinge shaft 13 is movably provided in the first through hole and the second through hole.

[0038] A supporting flange is formed at the root of the base plate, and the supporting flange is installed on the ceiling through expansion bolts. The supporting flange is arranged vertically to the base plate.

[0039] As a preferred embodiment, the first through hole is strip-shaped and arranged in the vertical direction. The two ends of the hinge shaft 13 are movably sleeved with a sleeve 14. The sleeve 14 is pressed against the outer side of the base plate 12. The two ends of the hinge shaft 13 are adjustablely mounted with fasteners 15. The fasteners 15 are pressed against the side of the sleeve 14 away from the base plate 12.

[0040] In this embodiment, the sleeve 14 is connected to the outer side of the base plate 12 by welding.

[0041] In some embodiments, a first anti-skid pattern is formed on one side of the sleeve 14 facing the substrate 12. A second anti-skid pattern is formed on the outer side of the substrate 12. The first anti-skid pattern is engaged with the second anti-skid pattern. A through hole is formed in the sleeve. The hinge shaft can be movably inserted into the through hole of the sleeve. A first anti-skid pattern is formed on the end surface of one end of the sleeve.

[0042] In this embodiment, the fastener is provided with a threaded hole, and external threads are formed at both ends of the hinge shaft. The fasteners are respectively screwed on both ends of the hinge shaft.

[0043] The seamless ceiling panel 2 includes a plurality of flexible inorganic cement panels 21 , a waterproof and breathable membrane 22 , a polyurea grouting liquid 23 , a cement-based polymer mortar layer 24 , an anti-cracking mesh cloth 25 and a hydrophobic coating 26 .

[0044] A plurality of flexible inorganic cement boards 21 are laid at the bottom of the keel layer 1. Polyurea grouting liquid 23 is poured into the joint between two adjacent flexible inorganic cement boards 21.

[0045] The upper surface of the flexible inorganic cement board 21 is paved with a waterproof and breathable membrane 22 .

[0046] The lower surfaces of the plurality of flexible inorganic cement boards 21 are paved with anti-cracking mesh cloth 25. The lower surfaces of the plurality of flexible inorganic cement boards 21 are coated with a cement-based polymer mortar layer 24. The cement-based polymer mortar layer 24 is coated on the anti-cracking mesh cloth 25.

[0047] The outer side of the cement polymer mortar layer is coated with a hydrophobic coating 26 .

[0048] As a preferred embodiment, the hydrophobic coating 26 is a silicone composite exterior wall latex paint coating.

[0049] An expansion joint is formed between the seamless ceiling panel 2 and the wall 5 .

[0050] One side of the elastic deformation plate 3 is anchored in the wall 5. The other side of the elastic deformation plate 3 is installed on the outer edge of the seamless ceiling plate 2. The elastic deformation plate 3 is arranged along the length direction of the expansion joint. The elastic deformation plate 3 is used to cover the expansion joint.

[0051] See also Figure 4 As shown, the middle portion of the elastic deformation plate 3 is bent to form a seepage groove 30 .

[0052] The other side of the elastic deformation plate is connected with an edge plate 31. A receiving groove 310 is formed on the side of the edge plate 31 away from the wall 5. The outer edge of the seamless ceiling plate 2 is embedded in the receiving groove 310.

[0053] The present invention provides a construction method of a seamless large-area integral ceiling structure for a swimming pool environment, comprising the following steps:

[0054] S1. Hingedly connect a plurality of suspension rods 11 on the ceiling 4.

[0055] S2. Connect the upper part of the keel layer 1 to the lower ends of multiple suspension rods 11.

[0056] Specifically, the welds of the keel layer are treated to prevent rust.

[0057] S3. Lay a plurality of flexible inorganic cement boards 21 on the bottom of the keel layer 1 respectively.

[0058] Before installing the flexible inorganic cement board, check the flatness of the base keel layer. The width of the joint between the boards is 5mm.

[0059] S4, laying a waterproof breathable membrane 22 on the upper surface of the flexible inorganic cement board 21.

[0060] S5, pouring polyurea grouting liquid 23 into the joint between two adjacent flexible inorganic cement boards 21.

[0061] S6. Laying the anti-cracking mesh cloth 25 on the lower surfaces of the plurality of flexible inorganic cement boards 21 .

[0062] S7, coating a cement-based polymer mortar layer 24 on the lower surfaces of the plurality of flexible inorganic cement boards 21 , so that the cement-based polymer mortar layer 24 is covered on the anti-cracking mesh cloth 25 .

[0063] The cement-based polymer single-component mortar is 5mm thick and is constructed in two layers. First, apply 3mm cement-based polymer single-component mortar on the inorganic flexible cement board, then hang alkali-resistant reinforced mesh cloth, and finally apply 2mm thick cement-based polymer single-component mortar and flatten it.

[0064] When constructing the unsealing tape, first apply 2mm thick cement-based polymer single-component mortar on the board joints, and then press in 100mm wide alkali-resistant reinforced mesh cloth unsealing tape.

[0065] S8. Apply a hydrophobic coating 26 on the outer side of the cement polymer mortar layer to form a seamless ceiling panel 2, and an expansion joint is formed between the seamless ceiling panel 2 and the wall 5.

[0066] Among them, the expansion joint between the seamless ceiling panel and the vertical wall is 15mm wide.

[0067] S9. Anchor one side of the elastic deformation plate 3 in the wall 5, and install the other side of the elastic deformation plate 3 on the outer edge of the seamless ceiling plate 2. The elastic deformation plate 3 is arranged along the length direction of the expansion joint.

[0068] The seamless large-area integral ceiling structure for a swimming pool environment of the present invention is a large-area seamless ceiling system that not only ensures that water vapor does not enter the internal space of the ceiling but also ensures that the ceiling itself is mildew-proof and self-cleaning. It provides a safe and reliable seamless large-area integral ceiling solution for public places such as swimming pools, effectively avoids a series of quality risks such as cracking and mildew, and improves the building usage experience and the safety of the public.

[0069] The seamless large-area integral ceiling structure for swimming pool environment of the present invention is suitable for swimming pool environment. It selects a flexible inorganic cement board, and uses polyurea grouting liquid to fill the joints at the joints so that the flexible inorganic cement board in the entire space forms a complete closed board surface. The keel layer and the ceiling of the main structure are connected in a hinged form, so that the large-space seamless ceiling board can better adapt to the structural micro-deformation of the large space. A 10mm expansion joint is set between the seamless ceiling board and the vertical wall, and an elastic deformation plate is embedded, which is beneficial to the cumulative temperature and swelling deformation of the large-area seamless ceiling board for stress release, and at the same time forms a closed barrier on the entire plane to ensure that water vapor does not enter the internal space of the ceiling. The resin coating used in the hydrophobic coating has excellent hydrophobicity and weather resistance, ensuring the self-cleaning function of the large-area integral ceiling for long-term use.

[0070] The keel layer is connected to the ceiling of the main structure in an articulated manner, allowing the keel layer to deform to a certain extent when subjected to external forces, thereby releasing stress and improving the stability of the overall structure. At the same time, it ensures that the keel layer can adapt to the micro-deformation of the structure under conditions such as temperature stress in a large-span space.

[0071] A waterproof and breathable membrane is pasted between the keel layer and the flexible inorganic cement board. On the one hand, it can isolate the water vapor environment of the swimming pool. On the other hand, the waterproof and breathable membrane is a flexible material that can fine-tune the gap formed by the unevenness of the keel layer, prevent the flexible inorganic cement board from vibrating under the action of external force vibration, and ensure the bite of the flat head screws and the flexible inorganic cement board.

[0072] There are no seams in the large-area seamless ceiling panels, and only expansion joints are set at the vertical structures (such as walls), which ensures the integrity of the appearance of the large-area seamless ceiling panels and releases the accumulated expansion deformation of the large-area seamless ceiling panels. The setting of the leakage grooves on the elastic deformation plates also guides and discharges the seepage of the vertical components.

[0073] A 5mm board seam (or splicing seam) is set between the flexible inorganic cement boards, and polyurea grouting liquid is poured into the board seam. The large-area suspended ceiling flexible inorganic cement boards are connected into a closed whole by utilizing the characteristics of dense polyurea structure, acid and alkali resistance, weather resistance, waterproofness, and ultra-high consolidation performance. This can isolate water vapor and also restrain and release the expansion and contraction of the flexible inorganic cement board itself.

[0074] The hydrophobic coating is made of silicone composite exterior latex paint, which combines the weather resistance of silicone and the ease of construction of latex paint to prevent the ceiling from being corroded by the chemical components in the pool water during long-term use. Its surface is not easy to absorb dust and other pollutants and is easy to clean. The shrinkage stress generated during the curing process is small, so it has good crack resistance. The theoretical coating rate of silicone composite exterior latex paint is usually high and can cover a larger area.

[0075] The wet expansion rate of flexible inorganic cement board does not exceed 0.15%, and the combustion grade is A1.

[0076] Silicone resin composite exterior wall latex paint has excellent water repellency and air permeability, and its water absorption and air permeability are far better than the standard requirements. It is an ideal water-repellent and breathable material; silicone resin composite exterior wall latex paint can resist acid and alkali erosion and maintain the integrity and beauty of the paint; the paint has good water resistance and can resist water penetration for a long time; silicone resin composite exterior wall latex paint has a low volatile organic compound (VOC) content and meets environmental protection requirements; the paint has high washability and can withstand multiple cleanings without being easily damaged.

[0077] Cement-based polymer single-component mortar is a composite material made of cement, aggregate and polymer emulsion. This mortar has a strong bond with the substrate, can form an integral part with the structure, and provide a solid bond. The addition of polymer greatly improves the waterproof and impermeability of the mortar, and can effectively prevent water penetration. The polymer mortar has good corrosion resistance and can resist the erosion of various chemicals. It is important that the polymer mortar has a certain degree of flexibility, can adapt to slight deformation, and reduce the occurrence of cracks.

[0078] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A seamless large-area integral ceiling structure for a swimming pool environment, characterized in that: include: A keel layer, wherein the upper portion of the keel layer is connected to a plurality of suspension rods, and the suspension rods are hinged to the ceiling; A seamless ceiling panel, comprising a plurality of flexible inorganic cement panels, wherein the plurality of flexible inorganic cement panels are laid at the bottom of the keel layer, a waterproof and breathable membrane is laid on the upper surface of the flexible inorganic cement panels, a polyurea grouting liquid is poured into the joint between two adjacent flexible inorganic cement panels, an anti-cracking mesh cloth is laid on the lower surface of the plurality of flexible inorganic cement panels, a cement-based polymer mortar layer is coated on the lower surface of the plurality of flexible inorganic cement panels, the cement-based polymer mortar layer is coated on the anti-cracking mesh cloth, a hydrophobic coating is coated on the outer side of the cement polymer mortar layer, and an expansion joint is formed between the seamless ceiling panel and the wall; An elastic deformation plate is used to cover the expansion joint and is arranged along the length direction of the expansion joint. One side of the elastic deformation plate is anchored in the wall, and the other side of the elastic deformation plate is installed on the outer edge of the seamless ceiling panel. The middle part of the elastic deformation plate is bent to form a seepage groove.

2. The seamless large-area integral ceiling structure for a swimming pool environment according to claim 1, characterized in that: Two base plates arranged opposite to each other are installed on the ceiling, and the two base plates are provided with a second through hole. The upper end of the suspension rod is movably arranged between the two base plates, and the upper end of the suspension rod is provided with a second through hole. A hinge shaft is movably provided in the first through hole and the second through hole.

3. The seamless large-area integral ceiling structure for a swimming pool environment according to claim 2, characterized in that: The first through hole is strip-shaped and arranged in the vertical direction. The two ends of the hinge shaft are movably provided with a sleeve, and the sleeve is pressed against the outer side of the base plate. The two ends of the hinge shaft are adjustably installed with fasteners, and the fasteners are pressed against the side of the sleeve away from the base plate.

4. The seamless large-area integral ceiling structure for a swimming pool environment according to claim 3, characterized in that: The sleeve is welded and connected to the outer side of the base plate.

5. The seamless large-area integral ceiling structure for a swimming pool environment according to claim 3, characterized in that: A first anti-slip pattern is formed on a side of the sleeve facing the substrate, and a second anti-slip pattern is formed on an outer side of the substrate, wherein the first anti-slip pattern is engaged with the second anti-slip pattern.

6. The seamless large-area integral ceiling structure for a swimming pool environment according to claim 1, characterized in that: The hydrophobic coating is a silicone resin composite exterior wall latex paint coating.

7. The seamless large-area integral ceiling structure for a swimming pool environment according to claim 1, characterized in that: The other side of the elastic deformation plate is connected to an edge plate, and a accommodating groove is formed on the side of the edge plate away from the wall, and the outer edge of the seamless ceiling plate is embedded in the accommodating groove.

8. A construction method for a seamless large-area integral ceiling structure for a swimming pool environment as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Hinged multiple suspension rods on the ceiling; Connecting the upper portion of the keel layer to the lower ends of the plurality of suspension rods; Laying a plurality of flexible inorganic cement boards on the bottom of the keel layer respectively; Laying a waterproof and breathable membrane on the upper surface of the flexible inorganic cement board; Pouring polyurea grouting liquid into the joint between two adjacent flexible inorganic cement boards; Laying anti-cracking mesh cloth on the lower surfaces of the plurality of flexible inorganic cement boards; Coating a cement-based polymer mortar layer on the lower surfaces of the plurality of flexible inorganic cement boards so that the cement-based polymer mortar layer is coated on the anti-cracking mesh cloth; Applying a hydrophobic coating on the outer side of the cement polymer mortar layer to form a seamless ceiling panel, and forming an expansion joint between the seamless ceiling panel and the wall; One side of the elastic deformation plate is anchored in the wall, and the other side of the elastic deformation plate is installed on the outer edge of the seamless ceiling plate. The elastic deformation plate is arranged along the length direction of the expansion joint.