A step-down ceiling system

Abstract

The present invention provides a drop ceiling system, which includes a modeling cassette keel system, an F keel, and a structural gypsum board; the modeling cassette keel can be used to easily shape different drop levels; the F keel makes it very easy to make an arc shape (such as a circular ceiling) in the same drop plane; and it can also ensure that the drop ceiling is not easy to crack at the concave / convex corners. In addition, the drop ceiling system is completely a light steel keel gypsum board structure, eliminating many disadvantages of wooden boards.

Description

Technical Field

[0001] The invention relates to a step-down ceiling system and an installation method thereof. Background Art

[0002] Traditional stepped ceilings mainly use wood panels such as core boards as structural panels, and then install gypsum boards on the outside of the structural panels, or use the traditional keel plus gypsum board structure. The use of wooden panels will increase the construction process and material usage, increase costs, and at the same time, wooden panels will release toxic and harmful gases, the ceiling is prone to deformation and cracking, and has poor fire resistance. The traditional keel plus gypsum board structure is not convenient for step-down shaping, and the stepped facade keel is not easy to connect with the ceiling secondary keel, and the stepped positive or negative corners are prone to cracking. Summary of the invention

[0003] The present invention aims to solve the above-described problems. The purpose of the present invention is to provide a drop ceiling system constructed by using a molded card keel, an F keel, and a high-strength gypsum board.

[0004] The stepped ceiling system includes a molded card keel, an F keel, and a structural gypsum board; the molded card keel includes a keel bottom plate, a left flange, and a right flange; the left flange and the right flange are symmetrically arranged on both sides of the keel bottom plate, and a card slot is arranged on the left flange and the right flange; the molded card keel is bent to form a concave angle and / or a convex angle; the F keel includes three flanges, namely a long side, a bottom side, and a short side, and the bottom side and the short side form a card slot; a plurality of V-shaped openings are arranged on the bottom side and the short side of the F keel; the structural gypsum board includes a vertical structural gypsum board and a horizontal structural gypsum board; the molded card keel includes a first horizontal section, the end of the first horizontal section is inserted into the card slot of the F keel, and is connected to the F keel. The keel bottom plate of the first horizontal section of the keel is connected and fixed to the short side of the F keel; the shaped card-type keel also includes a second horizontal section, and the end of the second horizontal section is connected to the facade structural gypsum board through a fourth U-shaped edge keel; one end of the facade structural gypsum board is connected to the floor slab through the first U-shaped edge keel; one end of the horizontal structural gypsum board is connected to the facade structural gypsum board through a third U-shaped edge keel, and is perpendicular to the facade structural gypsum board, and the other end of the horizontal structural gypsum board is connected to the wall through a second U-shaped edge keel; the ceiling system also includes a facade secondary keel, one end of the facade secondary keel is connected to the long side of the F keel, and the other end of the facade secondary keel is connected to the top layer keel through a fifth U-shaped edge keel.

[0005] The molded card-type keel is clamped at the inner corner of the inner corner, and the overlapping left and right flanges are fixed; the outer corner keel is clamped at the outer corner, and the separated left and right flanges are fixed through a fixing plate.

[0006] The drop ceiling system also includes:

[0007] A first stepped ceiling gypsum board, one end of the first stepped ceiling gypsum board is aligned with the facade structural gypsum board and connected to the fourth U-shaped edge trimming keel, and the other end is connected to the external corner keel, and the middle position is connected to the first stepped covering keel that is clipped to the second horizontal section of the card-type modeling keel; a first stepped facade gypsum board, one end of which is aligned with the first stepped ceiling gypsum board and fixed to the external corner keel, and the other end is fixed to the internal corner keel; a second stepped ceiling gypsum board, one end of which is aligned with the first stepped facade gypsum board and fixed to the internal corner keel, and the other end is connected to the bottom edge of the F keel; a second stepped facade gypsum board, one end of which is aligned with the second stepped ceiling gypsum board and fixed to the long side of the F keel, and the other end is connected and fixed to the fifth U-shaped edge trimming keel; a top-layer ceiling gypsum board, one end of which is aligned with the second stepped facade gypsum board and connected to the top-layer covering keel, and the top-layer covering keel is connected to the top-layer keel through a horizontal connector.

[0008] The stepped ceiling system is connected to the floor slab through the first hanger, the second hanger, the third hanger and the fourth hanger. The first hanger is fixedly connected to the top layer keel through the main keel, and the third hanger is connected and fixed to the vertical section of the modeling card-type keel through the L-shaped hanger; the second hanger and the fourth hanger are fixed to the first horizontal section and the second horizontal section of the modeling card-type keel.

[0009] The thickness of the structural gypsum board 2 is 18 mm.

[0010] A method for installing a suspended ceiling system comprises:

[0011] 1) Fix the first suspension rod (81), the second suspension rod (82), the third suspension rod (83) and the fourth suspension rod (84) on the floor slab (F) according to the designed positions and adjust the elevations;

[0012] 2) cutting the left flange (1a) and the right flange (1b) of the molded card keel (1) according to the designed size and bending them to shape;

[0013] 3) fixing the first U-shaped edge trimming keel (u1) on the floor (F) according to the designed position, and fixing the second U-shaped edge trimming keel (u2) on the wall (W) according to the designed position; fixing one end of the facade structural gypsum board (21) to the first U-shaped edge trimming keel (u1), fixing the third U-shaped edge trimming keel (u3) on the facade structural gypsum board (21), and making the third U-shaped edge trimming keel (u3) and the second U-shaped edge trimming keel (u2) on the same horizontal plane; fixing the fourth U-shaped edge trimming keel (u4) to the other end of the facade structural gypsum board (21); and fixing the horizontal structural gypsum board (22) to the second U-shaped edge trimming keel (u2) and the third U-shaped edge trimming keel (u3);

[0014] 4) Connect the top layer keel (32) to the suspension rod (81) through the main keel (6); connect one end of the facade secondary keel (31) to the top layer keel (32) through the fifth U-shaped edge keel (u5), and fix the F keel (5) on the facade secondary keel (31) at the other end, and adjust the elevation;

[0015] 5) Connect the vertical section of the shaped card-type keel (1) to the third hanger (83) through the L-shaped hanger (10), connect the first horizontal section (1p) of the card-type keel (1) to the second hanger (82), and connect the second horizontal section (1q) to the fourth hanger (84), and adjust the level and elevation. The end of the second horizontal section (1q) of the shaped card-type keel (1) is fixed to the fourth U-shaped edge keel (u4); the end of the first horizontal section (1p) of the shaped card-type keel (1) is inserted into the slot (5a) of the F keel (5) and fixed to the short side (53) of the F keel (5);

[0016] The inner corner keel (8) is inserted into the inner corner (A) of the molded card-type keel (1), and the outer corner keel (7) is inserted into the outer corner (B) of the molded card-type keel (1); at the inner corner (A), the left flange (1a) and the right flange (1b) are fixed, and at the outer corner (B), the left flange (1a) and the right flange (1b) are fixed via a fixing plate (9);

[0017] 6) The first step-down covering keel (34) is clamped on the second horizontal section (1q) of the clamp-type keel (1), and the top layer covering keel (33) is connected to the top layer keel (32) through a horizontal connecting piece (4);

[0018] 7) a first stepped ceiling gypsum board (D1), one end of which is aligned with the facade structural gypsum board (21) and connected to the fourth U-shaped edge keel (u4), the other end of which is connected to the external corner keel (7), and the middle position of which is connected to the first stepped covering keel (34); a first stepped facade gypsum board (D2), one end of which is aligned with the first stepped ceiling gypsum board (D1) and fixed to the external corner keel (7), and the other end of which is fixed to the internal corner keel (8); a second stepped ceiling gypsum board (D3), one end of which is aligned with the first stepped ceiling gypsum board (D1) and fixed to the external corner keel (7), and the other end of which is fixed to the internal corner keel (8); The first-level facade gypsum board (D2) is aligned with the internal angle keel (8), and the other end of which is connected to the bottom edge (52) of the F keel (5); the second-level facade gypsum board (D4), one end of which is aligned with the second-level ceiling gypsum board (D3) and fixed to the long side (51) of the F keel (5), and the other end is connected and fixed to the fifth U-shaped edge keel (u5); the top-level ceiling gypsum board (D5), one end of which is aligned with the second-level facade gypsum board (D4) and connected to the top-level covering keel (33).

[0019] The stepped ceiling system provided by the present invention can be very conveniently shaped by using the shaped card-type keel, which can not only improve the installation efficiency, but also ensure that the stepped ceiling is not easy to crack at the inner / outer corners. At the same time, by using the F keel, it can not only ensure that the stepped ceiling is not easy to crack at the inner / outer corners, but also make it very easy to make an arc shape (such as a circular ceiling) in the same stepped plane. In addition, the stepped ceiling system is completely a light steel keel gypsum board structure, eliminating many disadvantages of wooden boards.

[0020] Other characteristic features and advantages of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. For those of ordinary skill in the art, other drawings can be obtained from these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a drop ceiling system according to a first embodiment of the present invention is exemplarily shown;

[0023] Figure 2 A schematic diagram of shaping by shaping a card-type keel is shown exemplarily;

[0024] Figure 3 Schematic diagram of the modeling card keel;

[0025] Figure 4 It is a schematic diagram of the F keel;

[0026] Figure 5 This is a cross-sectional view of the F keel.

[0027] Figures and symbols: 1. Modeling card-type keel; 1a. Left flange; 1b. Right flange; 1c. Keel bottom plate; 1e. Connection fixing hole; 1f. Hoisting hole; 1p. First horizontal section; 1q. Second horizontal section; 2. Structural gypsum board; 21. Facade structural gypsum board; 22. Horizontal structural gypsum board; 31. Facade secondary keel; 32. Top layer keel; 33. Top layer covering keel; 34. First step covering keel; 4. Horizontal connecting piece; 5. F keel; 51. Long side; 52. Bottom side; 53. Short side; 5a. Slot; 6. Main keel; 7. Yang angle keel; 8. Yin angle keel; 9. Fixing plate; 10. L-shaped hanging parts; 81. First hanging rod; 82. Second hanging rod; 83. Third hanging rod; 84. Fourth hanging rod; u1. First U-shaped edge finishing keel; u2. Second U-shaped edge finishing keel; u3. Third U-shaped edge finishing keel; u4. Fourth U-shaped edge finishing keel; u5. Fifth U-shaped edge finishing keel; A. Internal angle; B. External angle; D1. First stepped ceiling gypsum board; D2. First stepped facade gypsum board; D3. Second stepped ceiling gypsum board; D4. Second stepped facade gypsum board; D5. Top ceiling gypsum board; F. Floor; W. Wall; X. Internal angle; Y1. First external angle; Y2. Second external angle. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0029] The step-down ceiling system provided by the present invention will be described in detail with reference to the accompanying drawings.

[0030] like Figures 1 to 5As shown, the drop ceiling system includes a molded card keel 1, an F keel 5, and a structural gypsum board 2; the molded card keel 1 includes a keel bottom plate 1c, a left flange 1a, and a right flange 1b; the left flange 1a and the right flange 1b are symmetrically arranged on both sides of the keel bottom plate 1c, and symmetrical card slots are arranged on the left flange 1a and the right flange 1b; the molded card keel is bent to form a negative angle A and / or a positive angle B; before the molded card keel 1 is bent, it is necessary to cut The F keel 5 includes three flanges, namely a long side 51, a bottom side 52, and a short side 53, and the bottom side 52 and the short side 53 form a slot 5a; a plurality of V-shaped openings are provided on the bottom side 52 and the short side 53 of the F keel, so that the F keel can be bent; the structural gypsum board 2 includes a vertical structural gypsum board 21 and a horizontal structural gypsum board 22; the modeling card keel 1 includes a first horizontal section 1p, the first horizontal section 1p The end is inserted into the slot 5a of the F keel 5 and connected to the F keel 5. The keel bottom plate 1c of the first horizontal section 1p of the modeling card-type keel 1 is connected and fixed to the short side 53 of the F keel; the modeling card-type keel also includes a second horizontal section 1q, and the end of the second horizontal section 1q is connected to the facade structural gypsum board 21 through the fourth U-shaped edge keel u4; one end of the facade structural gypsum board 21 is connected to the floor slab F through the first U-shaped edge keel u1; one end of the horizontal structural gypsum board 22 is connected to the facade structural gypsum board 21 through the third U-shaped edge keel u3, and is perpendicular to the facade structural gypsum board 21, and the other end of the horizontal structural gypsum board 22 is connected to the wall through the second U-shaped edge keel u2; the ceiling system also includes a facade secondary keel 31, one end of the facade secondary keel 31 is connected to the long side 51 of the F keel 5, and the other end of the facade secondary keel 31 is connected to the top layer keel 32 through the fifth U-shaped edge keel u5. Among them, the shaped card-type keel 1 facilitates the shaping of the stepped room; the F keel 5, as the edge keel of the shaped card-type keel 1, can keep the shaped card-type keel 1 in the same horizontal plane, and at the same time enable the second positive angle Y2 to form a straight line or a smooth curve in the plane with the F keel, which is particularly suitable for the curved stepped ceiling.

[0031] The inner corner keel 8 is clamped at the inner corner A of the molded card keel 1, and the overlapped left flange 1a and right flange 1b are fixed respectively; the outer corner keel 7 is clamped at the outer corner B, and the separated left flange 1a and right flange 1b are fixed respectively through the fixing plate 9. In this way, the molded card keel has sufficient strength to ensure the safety of the ceiling system.

[0032] The drop ceiling system also includes:

[0033] The first stepped ceiling gypsum board D1, one end of the first stepped ceiling gypsum board D1 is aligned with the facade structural gypsum board 21 and connected to the fourth U-shaped edge keel u4, the other end is connected to the external corner keel 7, and the middle position is connected to the first stepped covering keel 34 that is clipped to the second horizontal section 1q of the clip-type modeling keel 1; the first stepped facade gypsum board D2, one end of which is aligned with the first stepped ceiling gypsum board D1 and fixed to the external corner keel 7, and the other end of which is fixed to the internal corner keel 8; the second stepped ceiling gypsum board D3, one end of which is It is aligned with the first stepped facade gypsum board D2 and fixed to the internal angle keel 8, and its other end is connected to the bottom edge 52 of the F keel 5; the second stepped facade gypsum board D4, one end of which is aligned with the second stepped ceiling gypsum board D3 and fixed to the long side 51 of the F keel 5, and the other end is connected and fixed to the fifth U-shaped edge keel u5; the top ceiling gypsum board D5, one end of which is aligned with the second stepped facade gypsum board D4 and connected to the top covering keel 33, and the top covering keel 33 is connected to the top layer keel 32 through the horizontal connecting piece 4. In summary, at the first external corner Y1, the first stepped ceiling gypsum board D1 and the first stepped facade gypsum board D2 are fixed to the external corner keel 7 at the same time to form a whole; at the second external corner Y2, the second stepped ceiling gypsum board D3 and the second stepped facade gypsum board D4 are fixed to the F keel 5 at the same time to form a whole; at the internal corner X, the first stepped facade gypsum board D2 and the second stepped ceiling gypsum board D3 are fixed to the internal corner keel 8 at the same time to form a whole; this ensures that the gypsum boards at the internal and external corners of the ceiling system are not easy to crack.

[0034] The stepped ceiling system is connected to the floor F through the first hanger 81, the second hanger 82, the third hanger 83, and the fourth hanger 84. The first hanger 81 is fixedly connected to the top layer keel 32 through the main keel 6, and the third hanger 83 is connected and fixed to the vertical section of the molded cassette keel 1 through the L-shaped hanger 10; the second hanger 82 and the fourth hanger 84 are respectively fixed to the first horizontal section 1p and the second horizontal section 1q of the molded cassette keel 1.

[0035] The thickness of the structural gypsum board 2 is 18 mm. The gypsum board has high strength and can replace the traditional solution of keel plus gypsum board as a structural member, saving a lot of materials, improving construction efficiency and reducing comprehensive costs.

[0036] Methods for ceiling systems include:

[0037] Fix the first suspension rod 81, the second suspension rod 82, the third suspension rod 83, and the fourth suspension rod 84 on the floor F according to the designed position, and adjust the elevation;

[0038] Cut the left flange 1a and the right flange 1b of the shaped card keel 1 according to the designed size and bend them into shape;

[0039] The first U-shaped edge trimming keel u1 is fixed on the floor F according to the designed position, and the second U-shaped edge trimming keel u2 is fixed on the wall W according to the designed position; one end of the facade structure gypsum board 21 is fixed to the first U-shaped edge trimming keel u1, and the third U-shaped edge trimming keel u3 is fixed to the facade structure gypsum board 21, and the third U-shaped edge trimming keel u3 and the second U-shaped edge trimming keel u2 are made to be on the same horizontal plane; the fourth U-shaped edge trimming keel u4 is fixed to the other end of the facade structure gypsum board 21; the horizontal structure gypsum board 22 is fixed to the second U-shaped edge trimming keel u2 and the third U-shaped edge trimming keel u3;

[0040] Connect the top layer keel 32 to the suspension rod 81 through the main keel 6; one end of the facade secondary keel 31 is connected to the top layer keel 32 through the fifth U-shaped edge keel u5, and the other end fixes the F keel 5 on the facade secondary keel 31, and adjust the elevation;

[0041] Connect the vertical section of the shaped card-shaped keel 1 to the third hanging rod 83 through the L-shaped hanging piece 10, connect the first horizontal section 1p of the card-shaped keel 1 to the second hanging rod 82, and connect the second horizontal section 1q to the fourth hanging rod 84, and adjust the level and elevation. The end of the second horizontal section 1q of the shaped card-shaped keel 1 is fixed to the fourth U-shaped edge keel u4; the end of the first horizontal section 1p of the shaped card-shaped keel 1 is inserted into the slot 5a of the F keel 5 and fixed to the short side 53 of the F keel 5;

[0042] Insert the inner corner keel 8 into the inner corner A of the molded card-type keel 1, and insert the outer corner keel 7 into the outer corner B of the molded card-type keel 1; at the inner corner A, fix the left flange 1a and the right flange 1b, and at the outer corner B, fix the left flange 1a and the right flange 1b through the fixing plate 9;

[0043] The first step-down covering keel 34 is clamped on the second horizontal section 1q of the clamp-shaped keel 1, and the top layer covering keel 33 is connected to the top layer keel 32 through the horizontal connecting piece 4;

[0044] The first stepped ceiling gypsum board D1 has one end aligned with the facade structural gypsum board 21 and connected to the fourth U-shaped edge keel u4, and the other end is connected to the external corner keel 7, and the middle position is connected to the first stepped covering keel 34; the first stepped facade gypsum board D2 has one end aligned with the first stepped ceiling gypsum board D1 and fixed to the external corner keel 7, and the other end is fixed to the internal corner keel 8; the second stepped ceiling gypsum board D3 has one end aligned with the first stepped facade gypsum board D2 and fixed to the internal corner keel 8, and the other end is connected to the bottom edge 52 of the F keel 5; the second stepped facade gypsum board D4 has one end aligned with the second stepped ceiling gypsum board D3 and fixed to the long side 51 of the F keel 5, and the other end is connected and fixed to the fifth U-shaped edge keel u5; the top ceiling gypsum board D5 has one end aligned with the second stepped facade gypsum board D4 and connected to the top covering keel 33.

[0045] In summary, the stepped ceiling system of the present invention can be used in stepped ceiling projects, which facilitates modeling and improves installation efficiency. The stepped ceiling is not prone to cracking at the inner corners and / or outer corners and eliminates many disadvantages of wooden boards.

[0046] It should be pointed out that the above contents of the step-down ceiling system of the present invention can be implemented separately or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drop ceiling system, characterized in that: The drop ceiling system comprises a molded card keel (1), an F keel (5), and a structural gypsum board (2); The shaped card-type keel (1) comprises a keel bottom plate (1c), a left flange (1a), and a right flange (1b); the left flange (1a) and the right flange (1b) are symmetrically arranged on both sides of the keel bottom plate (1c), and card slots are arranged on the left flange (1a) and the right flange (1b); the shaped card-type keel is bent to form a concave angle (A) and / or a convex angle (B); The F keel (5) comprises three flanges, namely a long side (51), a bottom side (52), and a short side (53); the bottom side (52) and the short side (53) form a slot (5a); a plurality of V-shaped openings are provided on the bottom side (52) and the short side (53) of the F keel; The structural gypsum board (2) comprises a vertical structural gypsum board (21) and a horizontal structural gypsum board (22); The shaped card-type keel (1) comprises a first horizontal section (1p), the end of which is inserted into the card slot (5a) of the F keel (5) and connected to the F keel (5), and the keel bottom plate (1c) of the first horizontal section (1p) of the shaped card-type keel (1) is connected and fixed to the short side (53) of the F keel; the shaped card-type keel also comprises a second horizontal section (1q), the end of which is connected to the facade structural gypsum board (21) via a fourth U-shaped edge trimming keel (u4); One end of the vertical structural gypsum board (21) is connected to the floor slab (F) via a first U-shaped edge keel (u1); one end of the horizontal structural gypsum board (22) is connected to the vertical structural gypsum board (21) via a third U-shaped edge keel (u3) and is perpendicular to the vertical structural gypsum board (21); the other end of the horizontal structural gypsum board (22) is connected to the wall via a second U-shaped edge keel (u2); The ceiling system further comprises a secondary keel (31) of the vertical surface, one end of the secondary keel (31) of the vertical surface is connected to the long side (51) of the F keel (5), and the other end of the secondary keel (31) of the vertical surface is connected to the top layer keel (32) via a fifth U-shaped edge keel (u5); The inner corner keel (8) is clamped at the inner corner (A) of the molded cardan keel (1), and the overlapped left flange (1a) and the right flange (1b) are fixed; the outer corner keel (7) is clamped at the outer corner (B), and the separated left flange (1a) and the right flange (1b) are fixed by a fixing plate (9); The step-down ceiling system also includes: A first stepped ceiling gypsum board (D1), one end of which is aligned with the facade structural gypsum board (21) and connected to the fourth U-shaped edge keel (u4), and the other end is connected to the external angle keel (7), and the middle position thereof is connected to the first stepped covering keel (34) which is clipped to the second horizontal section (1q) of the modeling card-type keel (1); A first stepped facade gypsum board (D2), one end of which is aligned with the first stepped ceiling gypsum board (D1) and fixed to the external corner keel (7), and the other end of which is fixed to the internal corner keel (8); A second stepped ceiling gypsum board (D3), one end of which is aligned with the first stepped facade gypsum board (D2) and fixed to the internal angle keel (8), and the other end of which is connected to the bottom edge (52) of the F keel (5); A second stepped facade gypsum board (D4), one end of which is aligned with the second stepped ceiling gypsum board (D3) and fixed to the long side (51) of the F keel (5), and the other end of which is connected and fixed to the fifth U-shaped edge keel (u5); A top ceiling gypsum board (D5), one end of which is aligned with the second stepped facade gypsum board (D4) and connected to a top covering keel (33), wherein the top covering keel (33) is connected to a top layer keel (32) via a horizontal connecting piece (4); The stepped ceiling system is connected to the floor (F) via a first hanger (81), a second hanger (82), a third hanger (83) and a fourth hanger (84); the first hanger (81) is fixedly connected to the top layer keel (32) via a main keel (6); the third hanger (83) is connected and fixedly connected to the vertical section of the molded card-type keel (1) via an L-shaped hanger (10); the second hanger (82) and the fourth hanger (84) are fixed to the first horizontal section (1p) and the second horizontal section (1q) of the molded card-type keel (1).

2. The step-down ceiling system according to claim 1, characterized in that: The thickness of the structural gypsum board (2) is 18 mm.

3. A method for installing a ceiling system according to any one of claims 1 to 2, the method comprising: Fix the first hanger, the second hanger, the third hanger and the fourth hanger on the floor slab according to the designed position and adjust the elevation; Cut the left and right flanges of the shaped card keel according to the designed size and bend them into shape; Fix the first U-shaped edge trimming keel on the floor slab according to the designed position, and fix the second U-shaped edge trimming keel on the wall according to the designed position; fix one end of the facade structure gypsum board to the first U-shaped edge trimming keel, fix the third U-shaped edge trimming keel on the facade structure gypsum board, and make the third U-shaped edge trimming keel and the second U-shaped edge trimming keel on the same horizontal plane; fix the fourth U-shaped edge trimming keel to the other end of the facade structure gypsum board; fix the horizontal structure gypsum board to the second U-shaped edge trimming keel and the third U-shaped edge trimming keel; Connect the top layer keel to the hanger through the main keel; connect one end of the facade secondary keel to the top layer keel through the fifth U-shaped edge keel, and fix the F keel on the facade secondary keel at the other end, and adjust the elevation; Connect the vertical section of the shaped card-shaped keel to the third hanger through the L-shaped hanger, connect the first horizontal section of the card-shaped keel to the second hanger, connect the second horizontal section to the fourth hanger, and adjust the level and elevation; fix the end of the second horizontal section of the shaped card-shaped keel to the fourth U-shaped edge keel; insert the end of the first horizontal section of the shaped card-shaped keel into the slot of the F keel and fix it to the short side of the F keel; Insert the inner corner keel into the inner corner of the modeling card-type keel, and insert the outer corner keel into the outer corner of the modeling card-type keel; at the inner corner, the left flange and the right flange are fixed, and at the outer corner, the left flange and the right flange are fixed through the fixing plate; The first step-down covering keel is clamped on the second horizontal section of the clamp-shaped keel, and the top-layer covering keel is connected to the top-layer keel through a horizontal connecting piece; The first stepped ceiling gypsum board has one end aligned with the facade structural gypsum board and connected to the fourth U-shaped trimming keel, and the other end is connected to the external corner keel, and the middle position is connected to the first stepped covering keel; the first stepped facade gypsum board has one end aligned with the first stepped ceiling gypsum board and fixed to the external corner keel, and the other end is fixed to the internal corner keel; the second stepped ceiling gypsum board has one end aligned with the first stepped facade gypsum board and fixed to the internal corner keel, and the other end is connected to the bottom edge of the F keel; the second stepped facade gypsum board has one end aligned with the second stepped ceiling gypsum board and fixed to the long side of the F keel, and the other end is connected and fixed to the fifth U-shaped trimming keel; the top ceiling gypsum board has one end aligned with the second stepped facade gypsum board and connected to the top covering keel.

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