A kind of pre-installed fixing parts gap-leaving assembled ceiling and installation method

Abstract

The present invention relates to the field of architectural decoration, and in particular to a pre-installed fixing part seam-leaving assembled ceiling, comprising a keel assembly, a fixing part and a decorative panel, wherein the keel assembly comprises an inverted A keel and a self-mounted hanging inner buckle keel, wherein the self-mounted hanging inner buckle keel is provided with a first buckle portion for buckling with the inverted A keel above, and a second buckle portion for buckling with the fixing part below; a groove for engaging the decorative panel is provided below the fixing part, and a snap-in groove for matching with the second buckle portion is provided on the outer side, and the decorative panel is provided with a bent edge near its edge, the bent edge is embedded in the groove and fixed thereto, and a seam edge is provided between the bent edge and the edge of the decorative panel. The present invention adopts a plug-in design for the overall structure, improves the installation efficiency of the overall ceiling, overcomes the technical problem that the assembled ceiling cannot be disassembled, and improves the overall aesthetics and safety of the ceiling.

Description

Technical Field

[0001] The invention relates to the field of building decoration, and in particular to a pre-installed fixing part gap-retaining assembled ceiling and an installation method thereof. Background Art

[0002] With the advancement of factory production and modular installation in the field of building decoration, lightweight and high-strength aluminum honeycomb panels are increasingly used in interior decoration. Aluminum honeycomb panels are panels for ceilings made of double-sided aluminum skin and aluminum honeycomb cores composited at high temperature. In recent years, due to its superior performance, it has become more and more popular with owners, resulting in more and more decoration cases using this type of aluminum honeycomb panel ceiling. However, most of the prefabricated ceilings on the market are installed in single pieces in the form of exposed lines and frames, so their structure is relatively simple and aesthetically pleasing. At the same time, there is no very good solution for the edge of the ceiling and the joints of the decorative panels.

[0003] For example, a hook-type ceiling installation structure with application number CN202010434202.2 includes a screw rod, a hanger, a horizontal line, a vertical line, a trim line, a ceiling board and a filler board. A plurality of horizontal lines and vertical lines are respectively installed below the top of the wall through a plurality of hangers and screw rods. The horizontal lines are arranged at intervals in the horizontal direction, and the vertical lines are arranged at intervals in the vertical direction. A ceiling board is installed between two adjacent horizontal lines or vertical lines. The trim line is installed around the wall. A trim ceiling board is installed between the trim line and the adjacent horizontal lines or vertical lines. The ceiling board is installed on the hook support feet of the horizontal line through the clamping hooks at both ends. A filler board is installed between the ceiling board and the first limit stop frame. A ceiling support bracket and a third limit stop frame are arranged on the trim line. A filler board is installed between the trim ceiling board and the third limit stop frame. This ceiling installation structure has the advantages of simpler installation and reliable installation, but it still cannot solve the above-mentioned problems. Summary of the invention

[0004] The present invention aims to overcome the defects in the prior art that most of the assembled ceilings are installed in a single piece in the form of visible lines and groups of frames, resulting in a relatively simple structure and poor aesthetics, and at the same time, the edges of the ceiling and the joints of the decorative panels are not properly treated. A pre-installed fixing part and seam-leaving assembled ceiling and installation method are provided.

[0005] To achieve the above-mentioned purpose, the present invention is implemented by the following technical solutions:

[0006] A pre-installed fixing part joint-leaving assembled ceiling comprises a keel assembly, a fixing part arranged under the keel assembly, and a decorative panel fixedly connected to the fixing part.

[0007] The keel assembly includes an inverted A keel and a self-hanging inner keel, wherein the inverted A keel is fixedly connected to the wall through a hanging piece, and the self-hanging inner keel is provided with a first buckling portion for buckling with the inverted A keel above, and a second buckling portion for buckling with a fixing piece below;

[0008] The fixing member is composed of a U-shaped fixing member A and a U-shaped fixing member B which are combined side by side, and a groove for engaging the decorative panel is provided below both of them, and a clamping groove for matching with the second buckle portion is provided on the outer side of the U-shaped fixing member A and the U-shaped fixing member B respectively;

[0009] The decorative panel is provided with a bent edge near its edge, the bent edge is embedded in the groove and fixed thereto, and a seam edge is provided between the bent edge and the edge of the decorative panel.

[0010] The components such as the inverted A-shaped keel, the inward-hinged keel with built-in hangers, the U-shaped fixing piece A, the U-shaped fixing piece B and the decorative panel in the present invention are all of a plug-in design, thereby improving the installation efficiency of the suspended ceiling during the installation process and solving the technical problem that the assembled suspended ceiling cannot be disassembled.

[0011] At the same time, the assembled ceiling in the present invention abandons the installation method of the traditional ceiling in the form of visible lines and group frames. By adopting the design of large decorative panels, the decorative panels can be fitted with the grooves in the fixing parts due to the bending edges designed, and then fixed by gluing or screwing, thus solving the technical gap that the assembled ceiling cannot be designed with large panels. At the same time, due to the design of the splicing seam edge, the splicing seam edge can cover the fixing parts when the two decorative panels are connected, so that it can play the role of hidden process seams during the splicing process, solving the problems of uneven board surface, inconsistent seams, and overall unsightly appearance after installation.

[0012] Preferably, the inverted A-keel is a hollow inverted A-shape, the width of its lower end is smaller than the width of its upper end, and the top of the inverted A-keel is composed of two bent edges bent inward, thereby forming a snap-fitting groove compatible with the first snap-fitting part at the top of the inverted A-keel.

[0013] Preferably, the hanging member comprises a V-shaped hook whose shape matches the inverted A-shaped keel, a bending section is provided at the top of one side of the V-shaped hook, and the bending section is connected with a hanging rod for connecting to the wall through bolts.

[0014] The inverted A-shaped keel in the present invention matches the shape of the V-shaped hook. When the V-shaped hook is fixed to the top of the wall through the hanging rod, the inverted A-shaped keel can be inserted into the V-shaped groove of the V-shaped hook, thereby achieving the purpose of plug-in, achieving the purpose of fast installation and fast adjustment and disassembly, and effectively improving the installation efficiency during the installation process.

[0015] Preferably, the first fastening portion at the upper end of the built-in hanging member inner buckle keel is composed of two obliquely arranged L-shaped clamping claws, and the second fastening portion at the lower end of the built-in hanging member inner buckle keel is in a "Ji" shape, and the middle parts of its left and right sides are bent inward to form a clamping portion.

[0016] In the present invention, the first fastening portion at the upper end of the built-in hanging member inner buckle keel is composed of two L-shaped clamping claws. When it is necessary to fasten the inverted A keel to the first fastening portion, only need to push the built-in hanging member inner buckle keel upward, so that the bottom of the inverted A keel is embedded in the gap between the two L-shaped clamping claws of the first fastening portion. When the built-in hanging member inner buckle keel continues to be pushed upward, the L-shaped clamping claws can be opened. Until it is pushed to the top, the L-shaped clamping claws return to their original positions and can be fastened in the fastening groove at the top of the inverted A keel.

[0017] Preferably, the opening directions of the first fastening portion and the second fastening portion are perpendicular to each other.

[0018] Preferably, the cross-section of the U-shaped fixing member A is in a "Ji" shape, the heights of its left and right sides are the same, a first concave edge is provided in the middle of one side, and a clamping edge is provided outward at the bottom of the other side.

[0019] Preferably, the cross-section of the U-shaped fixing member B is also in a "Ji" shape, the height of one side is lower than the height of the other side, and the side with the lower height cooperates with the clamping edge, so that the heights of the U-shaped fixing member A and the U-shaped fixing member B are equal, and a second concave edge is provided in the middle of the other side.

[0020] The fixing member in the present invention is composed of a U-shaped fixing member A and a U-shaped fixing member B, both of which are in a "Ji" shape. One of the two sides is a straight edge, and the other is provided with a concave edge. Therefore, when the two straight edges are attached, a first concave edge and a second concave edge are respectively provided on the left and right sides of the combined fixing member. Its exterior can be clamped and fixed to the second fastening portion, and the bent edge of the decorative panel can be inserted into the area between the two and the straight edge, and the decorative panel can be fixed by means of adhesive and screw connection. Since a clamping edge is also provided outward at the bottom of the straight edge of the U-shaped fixing member A, the straight edge of the U-shaped fixing member B can be abutted above the clamping edge during the matching process. This matching method can greatly improve the stability when the U-shaped fixing member A and the U-shaped fixing member B are combined and fixed to the second fastening portion, and prevent the U-shaped fixing member A and the U-shaped fixing member B from slipping out from below the second fastening portion.

[0021] In addition, when the U-shaped fixing member A / B is arranged at the edge of the ceiling, it can improve the strength of the ceiling edge and reduce the loss rate of the board.

[0022] Preferably, the width of the clamping edge is twice the width of the joint edge.

[0023] In the present invention, the width of the clamping edge is set to twice the width of the splicing edge. Therefore, after the U-shaped fixing piece A and the U-shaped fixing piece B are respectively clamped with a decorative panel, the two splicing edges can just completely cover the clamping edge, thereby preventing the clamping edge from being exposed while minimizing the gap between the decorative panels, thereby greatly improving the aesthetics of the overall ceiling.

[0024] Preferably, the decorative panel includes a high-position plate, a step-down plate and a low-position plate, wherein the high-position plate is fixedly connected to a fixing member, one end of the step-down plate is connected to the fixing member, and the other end is bolted to the low-position plate via an angle iron.

[0025] A method for installing a pre-installed fixing piece gap-prepared assembled ceiling comprises the following steps:

[0026] S.1 Material preparation, first draw a line on the top surface of the wall;

[0027] S.2 Use expansion bolts to fix the hanging parts to the wall, and then fix the inverted A-shaped keel to the hanging parts;

[0028] S.3 Push the inner buckle keel of the self-attached pendant upwards so that the first buckle portion and the inverted A keel are mutually engaged, so that all the inner buckle keels of the self-attached pendant are fixed on the inverted A keel;

[0029] S.4 Fix the bent edges of the high-position board in the veneer into the grooves of the U-shaped fixing piece A and the U-shaped fixing piece B respectively, and then insert the assembled high-position board, the U-shaped fixing piece A and the U-shaped fixing piece B into the second buckling part of the inner buckle keel of the self-attached hanging piece in sequence to complete the installation of the high-position board;

[0030] S.5 Install the step-down board and the low-position board in sequence, and fix the two together through angle irons to complete the installation of the entire step-down ceiling.

[0031] Therefore, the present invention has the following beneficial effects:

[0032] (1) The present invention adopts a large-plate decorative panel design, filling the technical gap that assembled ceilings cannot be designed with large panels;

[0033] (2) The concealed seam design is used at the joints of the decorative panels to improve the overall aesthetics and safety of the ceiling;

[0034] (3) The overall structure adopts a plug-in design, which improves the installation efficiency of the overall ceiling and overcomes the technical problem that the assembled ceiling cannot be disassembled;

[0035] (4) When the U-shaped fixings A / B are set at the edge of the ceiling, the edge strength of the decorative panel can be enhanced, the loss rate of the panel can be reduced, and the problems of the existing assembled aluminum honeycomb ceiling in the edge treatment and the joints of the two decorative panels can be solved;

[0036] (5) The factory-prefabricated U-shaped fixings are connected to the panels to form standardized modules, meeting the requirements of prefabricated modular standardized installation;

[0037] (7) Solve the problems of uneven board surface, uneven seams, and overall unsightly appearance after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A structural schematic diagram of the present invention.

[0039] Figure 2 It is a structural schematic diagram of the present invention from another angle.

[0040] Figure 3 It is a top view of the present invention.

[0041] Figure 4 It is a side view of the present invention.

[0042] Figure 5 For the present invention Figure 1 Enlarged view of point a in the middle.

[0043] Figure 6 It is a schematic structural diagram of the decorative panel of the present invention.

[0044] Figure 7 It is a schematic structural diagram of the inverted A-keel of the present invention.

[0045] Figure 8 It is the front view of the inverted A keel of the present invention.

[0046] Fig. 9 It is a schematic structural diagram of the hanging member of the present invention.

[0047] Fig.10 It is a structural schematic diagram of the inner buckled keel with a self-contained pendant of the present invention.

[0048] Fig.11 It is a side view of the inner buckled keel with a self-contained pendant of the present invention.

[0049] Fig.12 It is a front view of the inner buckled keel with a self-contained pendant of the present invention.

[0050] Fig.13 It is a schematic structural diagram of the U-shaped fixing member A of the present invention.

[0051] Fig.14 It is a front view of the U-shaped fixing member A of the present invention.

[0052] Fig.15 It is a schematic structural diagram of the U-shaped fixing member B of the present invention.

[0053] Fig.16 It is a front view of the U-shaped fixing member B of the present invention.

[0054] Wherein: keel assembly 1, fixing part 2, decorative panel 3, inverted A keel 4, inner keel with built-in hanger 5, hanging part 6, first buckling part 7, second buckling part 8, U-shaped fixing part A9, U-shaped fixing part B10, groove 11, clamping groove 12, bending edge 13, splicing edge 14, bending edge 15, buckling groove 16, V-shaped hook 17, hanging rod 18, bending section 19, clamping part 20, first inner concave edge 21, clamping edge 22, second inner concave edge 23, high-position plate 24, step-down plate 25, low-position plate 26, angle iron 27, L-shaped clamping claw 28. DETAILED DESCRIPTION

[0055] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments of the specification. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0056] Example 1

[0057] like Figures 1 to 16 A pre-installed fixing component seam-leaving assembled ceiling comprises a keel assembly 1, a fixing component 2 arranged below the keel assembly 1, and a decorative panel 3 fixedly connected to the fixing component 2.

[0058] The keel assembly 1 includes an inverted A-shaped keel 4 and an inner buckled keel 5 with a built-in hanging part, wherein:

[0059] The inverted A-shaped keel 4 is in the shape of an elongated strip, and its cross section is a hollow inverted A-shape with a width at the lower end smaller than that at the upper end. Its top is composed of two bent edges 15 bent toward its internal cavity, thereby forming a snap-fitting groove 16 at the top of the inverted A-shaped keel 4 that matches the first snap-fitting portion 7.

[0060] In addition, the inverted A-shaped keel 4 can be fixedly connected to the wall through a hanging member 6. The hanging member 6 includes a V-shaped hook 17 whose shape is adapted to the inverted A-shaped keel 4. A bent section 19 is provided at the top of one side of the V-shaped hook 17. A hanging rod 18 for connecting to the wall is provided through bolt connection on the bent section 19. When the V-shaped hook 17 is fixed on the top of the wall through the hanging rod 18, the inverted A-shaped keel 4 can be inserted into the V-shaped groove of the V-shaped hook 17, achieving the purpose of snap-in type, that is, achieving the purpose of quick installation and quick adjustment and disassembly of the inverted A-shaped keel 4, and effectively improving the installation efficiency during the installation process.

[0061] The self-carrying hanging member internal snap-in keel 5 is also in a long strip shape. A first snap-in portion 7 composed of two obliquely arranged L-shaped clamping claws 28 is provided above it. When it is necessary to snap the inverted A-shaped keel 4 with the first snap-in portion 7, only need to push the self-carrying hanging member internal snap-in keel 5 upward, so that the bottom of the inverted A-shaped keel 4 is embedded between the two L-shaped clamping claws 28 of the first snap-in portion 7. When the self-carrying hanging member internal snap-in keel 5 continues to be pushed upward, the L-shaped clamping claws 28 can open. Until it is pushed to the top, the L-shaped clamping claws 28 can return to their original positions and snap into the snap-in groove 16 at the top of the inverted A-shaped keel 4.

[0062] A second snap-in portion 8 for snap-fitting with the fixing member 2 in a "U" shape is provided below the self-carrying hanging member internal snap-in keel 5. The middle parts of the left and right sides of the second snap-in portion 8 are bent inward to form a clamping portion 20 for clamping the fixing member 2.

[0063] In addition, the opening directions of the second snap-in portion 8 of the snap-in portion are arranged perpendicular to each other with the opening direction of the first snap-in portion 7, so that when the self-carrying hanging member internal snap-in keel 5 is fixed to the inverted A-shaped keel 4, the self-carrying hanging member internal snap-in keel 5 and the inverted A-shaped keel 4 are arranged perpendicular to each other, and the fixing member 2 is also arranged perpendicular to them.

[0064] The fixing member 2 is composed of a U-shaped fixing member A 9 and a U-shaped fixing member B 10 arranged side by side. Grooves 11 for fitting the decorative panel 3 are provided below both of them, and clamping grooves 12 adapted to the second snap-in portion 8 are provided on the outer sides of the U-shaped fixing member A 9 and the U-shaped fixing member B 10 respectively. Therefore, when the U-shaped fixing member A 9 and the U-shaped fixing member B 10 are combined to form the fixing member 2, the clamping portion 20 of the second snap-in portion 8 in a "U" shape can just be snapped into the clamping groove 12, thus realizing the fixation of the fixing member 2.

[0065] In order to describe the structures of the U-shaped fixing member A 9 and the U-shaped fixing member B 10 in more detail, the following further describes the two of them in this embodiment:

[0066] The cross-section of the U-shaped fixing part A 9 is in a "Ji" shape. The heights of its left and right sides are the same. A first concave edge 21 is provided in the middle of one side, and the other side is a straight edge. A clamping edge 22 is provided outward at the bottom of the straight edge.

[0067] The cross-section of the U-shaped fixing part B 10 is also in a "Ji" shape. The height of one side is lower than that of the other side. The side with a lower height is a straight edge, which can cooperate with the clamping edge 22 so that the heights of the U-shaped fixing part A 9 and the U-shaped fixing part B 10 are level. A second concave edge 23 is provided in the middle of the other side.

[0068] Therefore, when the straight edges of the U-shaped fixing part A 9 and the U-shaped fixing part B 10 are fitted together, a first concave edge 21 and a second concave edge 23 are respectively provided on the left and right sides of the combined fixing part 2. The outside of it can be clamped and fixed with the bent part of the second fastening part 8. And in the area between its first concave edge 21, second concave edge 23 and the straight edge, the bent edge 13 of the decorative panel 3 can be inserted, and the decorative panel can be fixed by means of adhesive bonding and screw connection. Since a clamping edge 22 is also provided outward at the bottom of the straight edge of the U-shaped fixing part A, the straight edge of the U-shaped fixing part B 10 can abut above the clamping edge 22 during the cooperation process. This cooperation method can greatly improve the stability when the U-shaped fixing part A 9 and the U-shaped fixing part B 10 are combined and fixed with the second fastening part 8, and prevent the U-shaped fixing part A 9 and the U-shaped fixing part B 10 from sliding out from below the second fastening part 8. In addition, the U-shaped fixing part A / B can not only be used as a connecting part to connect the decorative panel 3, but also can improve the strength of the edge of the decorative panel and reduce the loss rate of the board when it is arranged at the edge of the suspended ceiling.

[0069] The decorative panel 3 includes a high-level board 24, a stepped board 25 and a low-level board 26. The high-level board 24 is fixedly connected to the fixing part 2, and one end of the stepped board 25 is connected to the fixing part 2, and the other end is bolted to the low-level board 26 through an angle iron 27.

[0070] Whether it is the high-level board 24, the stepped board 25 or the low-level board 26, a bent edge 13 is provided near its edge. The bent edge 13 can be embedded inside the groove 11 and fixed to it by means of adhesive bonding or nailing. In addition, a splicing edge 14 is provided between the bent edge 13 and the edge of the decorative panel 3. The width of the splicing edge 14 is half of the width of the clamping edge 22. Therefore, after a decorative panel 3 is respectively clamped by the U-shaped fixing part A 9 and the U-shaped fixing part B 10, the two splicing edges 14 can just completely cover the clamping edge 22, so as to prevent the leakage of the clamping edge 22 on the premise of尽可能 reducing the gap between the decorative panels 3, and greatly improving the aesthetics of the overall suspended ceiling.

[0071] Example 2

[0072] A method for installing the pre-installed fixing member seam-retaining assembled ceiling in Embodiment 1 comprises the following steps:

[0073] S.1 Material preparation, first draw a line on the top surface of the wall;

[0074] S.2 Use expansion bolts to fix the hanging parts 6 to the wall, then fix the inverted A-shaped keel 4 to the hanging parts 6, and then install the base components such as wood-plastic lines;

[0075] S.3 Push the self-mounted hanging inner buckle keel 5 upwards, so that the first buckle part 7 and the inverted A keel 4 are mutually engaged, so that all the self-mounted hanging inner buckle keels 5 are fixed on the inverted A keel 4;

[0076] S.4 The bent edges 13 of the high-position plate 24 in the decorative panel 3 are respectively fixedly embedded in the grooves 11 of the U-shaped fixing piece A9 and the U-shaped fixing piece B10, and fixed by gluing or nailing, and then the assembled high-position plate 24, the U-shaped fixing piece A9 and the U-shaped fixing piece B10 are sequentially inserted into the second buckling part 8 of the self-attached hanging inner buckle keel 5 to complete the installation of the high-position plate 24;

[0077] S.5 Install the step-down plate 25 and the low-position plate 26 in sequence, and fix the two together through the angle iron 27, thereby completing the installation of the entire step-down ceiling.

Claims

1. A pre-installed fixing piece with a gap-retaining type assembled ceiling, comprising a keel assembly (1), a fixing piece (2) arranged below the keel assembly (1), and a decorative panel (3) fixedly connected to the fixing piece (2), characterized in that the keel assembly (1) includes an inverted A-shaped keel (4) and an internally buckled keel (5) with its own hanging piece. Among them, the inverted A-shaped keel (4) is fixedly connected to the wall through a hanging piece (6). A first buckling part (7) for buckling with the inverted A-shaped keel (4) is arranged above the internally buckled keel (5) with its own hanging piece, and a second buckling part (8) for buckling with the fixing piece (2) is arranged below; the fixing piece (2) is composed of a U-shaped fixing piece A (9) and a U-shaped fixing piece B (10) arranged side by side. Grooves (11) for fitting the decorative panel (3) are arranged below both of them, and clamping grooves (12) for adapting to the second buckling part (8) are arranged on the outer sides of the U-shaped fixing piece A (9) and the U-shaped fixing piece B (10) respectively; a bending edge (13) is arranged near the edge of the decorative panel (3). The bending edge (13) is embedded in the groove (11) and fixed thereto, and a joint edge (14) is arranged between the bending edge (13) and the edge of the decorative panel (3); the inverted A-shaped keel (4) is in a hollow inverted A shape, and the width of its lower end is smaller than that of its upper end. The top of the inverted A-shaped keel (4) is composed of two bending edges (15) bent inward, so as to form a buckling groove (16) on the top of the inverted A-shaped keel (4) that is adapted to the first buckling part (7); the cross-section of the U-shaped fixing piece A (9) is in a "Ji" shape, and the heights of its left and right sides are the same. A first concave edge (21) is arranged in the middle of one side, and a clamping edge (22) is arranged outward at the bottom of the other side; the cross-section of the U-shaped fixing piece B (10) is also in a "Ji" shape. The height of one side is lower than that of the other side. The side with a lower height cooperates with the clamping edge (22) so that the heights of the U-shaped fixing piece A (9) and the U-shaped fixing piece B (10) are equal, and a second concave edge (23) is arranged in the middle of the other side; 2. The pre-installed fixing joint-leaving assembled ceiling according to claim 1, characterized in that: the hanging piece (6) includes a V-shaped hook (17) whose shape is adapted to the inverted A-shaped keel (4). A bending section (19) is arranged at the top of one side of the V-shaped hook (17), and a hanging rod (18) for connecting with the wall is arranged through bolt connection on the bending section (19); 3. The pre-installed fixing joint-leaving assembled ceiling according to claim 1, characterized in that: the first buckling part (7) at the upper end of the internally buckled keel (5) with its own hanging piece is composed of two obliquely arranged L-shaped clamping claws (28). The second buckling part (8) at the lower end of the internally buckled keel (5) with its own hanging piece is in a "Ji" shape, and the middle parts of its left and right sides are bent inward to form a clamping part (20); 4. A pre-installed fixing joint-type assembled ceiling according to claim 1 or 3, characterized in that: the opening directions of the first buckling part (7) and the second buckling part (8) are perpendicular to each other; 5. The pre-installed fixing joint-leaving assembled ceiling according to claim 1, characterized in that: the width of the clamping edge (22) is twice the width of the joint edge (14).

6. The pre-installed fixing joint-type assembled ceiling according to claim 1, characterized in that: The decorative panel (3) comprises a high-position plate (24), a step-down plate (25) and a low-position plate (26), wherein the high-position plate (24) is fixedly connected to the fixing member (2), and one end of the step-down plate (25) is connected to the fixing member (2), and the other end is bolted to the low-position plate (26) via an angle iron (27).

7. A method for installing a pre-installed fixed-piece joint-prepared ceiling according to any one of claims 1 to 6, characterized in that: The following steps are involved: S.1 Material preparation, first draw a line on the top surface of the wall; S.2 Use expansion bolts to securely connect the hanging component (6) to the wall, and then secure the inverted A-shaped keel (4) to the hanging component (6); S.3 Push the self-attached inward keel (5) upwards so that the first buckling portion (7) and the inverted A keel (4) are mutually engaged, so that the entire self-attached inward keel (5) is fixed on the inverted A keel (4); S.4 The bent edges (13) of the high-position plate (24) in the veneer panel (3) are respectively fixedly embedded in the grooves (11) of the U-shaped fixing piece A (9) and the U-shaped fixing piece B (10), and then the assembled high-position plate (24), the U-shaped fixing piece A (9) and the U-shaped fixing piece B (10) are sequentially inserted into the second buckling portion (8) of the self-attached hanging inner buckle keel (5), thereby completing the installation of the high-position plate (24); S.5 The step-down plate (25) and the low-position plate (26) are installed in sequence, and the two are fixedly connected by angle iron (27), thereby completing the installation of the entire step-down ceiling.

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