A U-shaped decorative structure at the root of a steel structure beam and its installation method

Abstract

The present invention discloses a U-shaped decorative structure at the root of a steel structure beam and an installation method thereof. The structure comprises a radial steel beam, a steel beam root section arranged at the extended end of the radial steel beam, a main structure ring edge connected to the extended end of the steel beam root section, a decorative panel connected to the steel beam root section and the main structure ring edge, and a supporting keel connected between the decorative panel and the steel beam root section; the decorative panels arranged at the steel beam root section and the main structure ring edge enclose a U-shaped opening in a horizontal section. The present invention ensures the strength, uniform linear force and aesthetic style of the connection by setting the joint between the radial steel beam and the steel beam root section, wherein the radial steel beam is reduced in diameter, the flange plate of the steel beam root section is enlarged, etc.; the U-shaped opening is enriched with multiple arcs and curvatures by setting the decorative panel, and the smoothness and integrity of the U-shaped opening are ensured; by setting the supporting keel, three levels of keels are arranged in sequence with clear functions and linear divisions, which is conducive to ensuring the support and force of the decorative panel in a hierarchical manner.

Description

Technical Field

[0001] The invention relates to the field of steel structure construction, and in particular to a U-shaped decorative structure at the root of a steel structure beam and an installation method thereof. Background Art

[0002] Due to the excellent performance and diverse forms of steel structures, they are increasingly used in large buildings such as stadiums, swimming pools and exhibition halls. The steel structure beams have also changed from a single straight line to curved or even multi-curved components, and the construction difficulty is becoming more and more difficult. The general connection between the steel structure beam and the surrounding circumferential beam is a T-shaped connection, and the decorative panel is also a single straight-line setting, and does not involve the U-shaped and multi-angle and multi-curvature installation, nor does it involve the special treatment of the beam, main structure beam and supporting keel at the decorative panel due to the U-shaped structure, so targeted design is required. Summary of the invention

[0003] The invention provides a U-shaped decorative structure at the root of a steel structure beam and an installation method thereof, which are used to solve technical problems such as beam docking, decorative panel design and keel support at the U-shaped decorative structure at the root of the structure beam.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A U-shaped decorative structure at the root of a steel structure beam, comprising a radial steel beam, a steel beam root section arranged at an outwardly extending end of the radial steel beam, a body structure ring edge connected to the outwardly extending end of the steel beam root section, a decorative panel connected to the steel beam root section and the main structure ring edge, a supporting keel connected between the decorative panel and the steel beam root section, and an oblique connecting beam connected between adjacent steel beam root sections;

[0006] The main structure ring edge is arranged in an elliptical ring shape or a circular ring shape, and the decorative panels arranged at the root section of the steel beam and the main structure ring edge enclose a U-shaped opening in a horizontal section, and the U-shaped opening is arranged in a continuous W shape at the main structure ring edge; the U-shaped opening is arranged vertically inwardly from bottom to top in a trumpet shape;

[0007] The radial steel beam is provided with a variable diameter at the connection with the root section of the steel beam, and the variable diameter is provided in a gradually expanding trumpet shape; the radial steel beam comprises a radial beam body and a radial beam belt provided at the bottom of the radial beam body, and the radial beam belt is in the shape of a slat and provided on both sides of the bottom of the radial beam body in the long direction;

[0008] The bottom decorative panel of the steel beam root section is also provided with a decorative panel belt, which is arranged in an R-shape on a steel beam root section and is smoothly connected with the radial beam belt.

[0009] Furthermore, the radial steel beam is rectangular and gradually becomes smaller inward at the connection of the root section of the steel beam; the root section of the steel beam is a U-shaped beam, and the upper flange plate and the lower flange plate at the connection with the radial steel beam are gradually expanded; the upper flange plate of the root section of the steel beam and the top plate of the radial steel beam are also connected with a beam connecting plate.

[0010] Furthermore, the decorative panels are all assembled and connected, and the plate seams are pre-set in blocks at the oblique connecting beams and through-holes are reserved; the decorative panels are fluorocarbon sprayed aluminum veneers with a thickness of not less than 3 mm.

[0011] Furthermore, the decorative panel includes a decorative inner panel arranged on the inner side of the U-shaped opening and located at the side of the root section of the steel beam, a decorative top panel arranged at the top of the U-shaped opening and located at the top of the root section of the steel beam, a decorative top side panel arranged at the top of the U-shaped opening and located at the top of the main structure ring edge, and a decorative bottom panel arranged at the bottom of the U-shaped opening and located at the bottom of the root section of the steel beam.

[0012] Furthermore, the decorative top plate is locally arranged at the top of the root section of the steel beam, and the decorative top plate is arranged on both sides of the top of the root section of the steel beam in the long direction; and the top surface of the decorative top plate is lower than the top surface of the decorative inner plate; the decorative top plate and the decorative bottom plate are arranged obliquely as a whole, and they are inclined along the root section of the steel beam toward the edge of the main structure.

[0013] Furthermore, the main structure ring edge is a rectangular beam body, and a decorative wing corbel is also arranged on the top of the main structure ring edge; the corresponding joint seam of the decorative top edge plate is arranged at the decorative wing corbel, and the decorative top edge plate extends outward from the top of the main structure ring edge.

[0014] Furthermore, an X-shaped oblique connecting beam is provided at two continuous U-shaped openings, and the intersection of the X-shaped oblique connecting beam is located in the middle of the common side of the two U-shaped openings.

[0015] Furthermore, the supporting keel includes a primary keel connected to the root section of the steel beam or the decorative wing corbel, a secondary keel connected between adjacent primary keels, and a tertiary keel connected between two secondary keels or between a secondary keel and a primary keel; the primary keel is fixedly connected to the root section of the steel beam by a pre-connecting plate.

[0016] Furthermore, the first-level keel includes side beam rods arranged along the upper and lower sides of the steel beam root section, U-shaped rods between two steel beam root sections, and ring-shaped edge rods arranged upward and downward along the inner side of the steel beam root section adjacent to the ring edge of the main structure; the second-level keel is a connecting rod arranged circumferentially at intervals between upper and lower adjacent U-shaped rods, a connecting rod between the U-shaped rod and the adjacent side rods in the horizontal direction, and a connecting rod between the U-shaped rod and the ring-shaped edge rod; the third-level keel is an oblique rod arranged on the connecting rod to connect with other rods.

[0017] Furthermore, the installation method of the U-shaped decorative structure at the root of the steel structure beam body has the following specific steps:

[0018] Step 1: According to the design, the column is constructed first, and then the radial steel beams and the main structure ring are assembled and constructed. The root section of the steel beam is connected to the radial steel beam and the main structure ring after the construction is completed;

[0019] Step 2: pre-arrange a corbel or connector connected to the oblique connecting beam on the root section of the steel beam, wherein a connector is arranged at the intersection of the two oblique connecting beams at the middle upper part of the root section of the steel beam, and a corbel is arranged at the inner corner where the root section of the steel beam is connected to the main structure ring edge;

[0020] Step 3: Pre-install the pre-connecting plate when constructing the root section of the steel beam. After the construction of the root section of the steel beam is completed, install the first-level keel, the second-level keel and the third-level keel in sequence at the root section of the steel beam, the main structure ring edge and the decorative wing corbel;

[0021] Step 4: For the segmentation of the veneer panels, three-dimensional modeling is first performed to segment the veneer panels into panels that are easy to produce and hoist; wherein, the oblique connecting beam is formed by assembling two or more veneer panels with a blank design, and the veneer panels are integrally designed and manufactured with the veneer panel strips, and the segmented panels are numbered and sorted;

[0022] Step 5: The finished decorative panels are bent into the required angles before installation, and back ribs are arranged at intervals on the back side in the vertical direction, and the back ribs are fixed to the supporting keels by welding or fixed by detachable adjustment through hanging parts, wherein at least the upper and lower parts of the decorative panels in the vertical direction are provided with arc-shaped back ribs;

[0023] Step six: The veneer strip and the radial beam strip in the radial steel beam are butt-jointed and measurement and control points are set at the intersection to ensure installation accuracy; glue is applied around the gap at the intersection of the veneer panel and the radial steel beam; the assembly seams between the veneer panels are sealed with glue, and no glue is applied between the veneer panels corresponding to the lower opening and the visible side surfaces with a width of less than 10mm; thus completing the construction of the U-shaped decorative structure at the root of the steel structure beam.

[0024] The beneficial effects of the present invention are embodied in:

[0025] 1) The present invention ensures the strength of the connection, uniform linear force and aesthetic appearance of the connection by setting the joint between the radial steel beam and the root section of the steel beam, including the diameter reduction treatment of the radial steel beam and the enlargement treatment of the flange plate of the root section of the steel beam;

[0026] 2) The present invention enriches the multi-radian and multi-curvature settings of the U-shaped opening through the setting of the decorative panels, and on the other hand, the different settings of the decorative panels at various positions ensure the smoothness and integrity of the U-shaped opening;

[0027] 3) The present invention sets the supporting keel, and the three levels of keels are set in sequence with clear functions and line types, which is conducive to ensuring the support and force of the decorative panel in a hierarchical manner; it is also conducive to convenient construction and installation;

[0028] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention; the main purpose and other advantages of the present invention may be realized and obtained through the solutions particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a top view of the U-shaped decorative structure at the root of the steel structure beam;

[0030] Figure 2 This is a bottom view of the U-shaped decorative structure at the root of the steel structure beam;

[0031] Figure 3 This is a partial top view of the U-shaped decorative structure at the root of the steel structure beam;

[0032] Figure 4 This is a partial bottom view of the U-shaped decorative structure at the root of the steel structure beam;

[0033] Figure 5 It is a schematic diagram of the oblique coupling beam and its connection structure;

[0034] Figure 6 This is a schematic diagram of assembling decorative panels at the diagonal connecting beam;

[0035] Figure 7 It is a top view schematic diagram of the supporting keel installation structure;

[0036] Figure 8 It is a bottom-up schematic diagram of the supporting keel installation structure.

[0037] Figure numerals: 1-radial steel beam, 101-radial beam body, 102-radial beam strip, 2-steel beam root section, 3-decorating panel, 31-decorating inner plate, 32-decorating top plate, 33-decorating top edge plate, 34-decorating bottom plate, 4-U-shaped mouth, 5-oblique connecting beam, 6-main structure ring edge, 7-column, 8-decorative wing corbel, 9-decorating panel strip, 10-first-level keel, 11-second-level keel, 12-third-level keel, 13-beam connecting plate, 14-pre-connecting plate, 15-plate seam. DETAILED DESCRIPTION

[0038] Take a stadium as an example, in order to ensure the multi-level continuous U-shaped design around the steel structure, a U-shaped decorative structure at the root of the steel structure beam is specially designed. Figures 1 to 8 As shown, the U-shaped decorative structure at the root of the steel structure beam body includes a radial steel beam 1, a steel beam root section 2 arranged at the extended end of the radial steel beam 1, a body structure ring edge connected to the extended end of the steel beam root section 2, a decorative panel 3 connected to the steel beam root section 2 and the main structure ring edge 6, a supporting keel connected between the decorative panel 3 and the steel beam root section 2, and an oblique connecting beam 5 connected between adjacent steel beam root sections 2.

[0039] Among them, the main structure ring edge 6 is set in an elliptical ring shape, and the decorative panels 3 set at the root section 2 of the steel beam and the main structure ring edge 6 enclose a U-shaped opening 4 with a horizontal section. The U-shaped opening 4 is set in a continuous W shape on the main structure ring edge 6; the U-shaped opening 4 is set in a multi-curvature arc shape in the vertical and horizontal directions, and the vertical inner side of the U-shaped opening 4 is set in a trumpet shape from bottom to top.

[0040] In this embodiment, the connection between the radial steel beam 1 and the steel beam root section 2 is configured with a variable diameter, and the variable diameter section is configured as a gradually expanding trumpet shape; the radial steel beam 1 includes a radial beam body 101 and a radial beam belt 102 arranged at the bottom of the radial beam body 101, and the radial beam belt 102 is in the shape of a strip and is arranged on both sides of the long direction of the bottom of the radial beam body 101; the bottom decorative panel 3 of the steel beam root section 2 is also provided with a decorative panel belt 9, and the decorative panel belt 9 is arranged in an R shape on a steel beam root section 2, and is arranged in a continuous manner with the radial beam belt 102.

[0041] The radial steel beam 1 is rectangular and gradually becomes smaller inward at the connection with the steel beam root section 2; the steel beam root section 2 is a U-shaped beam, and the upper flange plate and the lower flange plate at the connection with the radial steel beam 1 are gradually expanded; the upper flange plate of the steel beam root section 2 and the top plate of the radial steel beam 1 are also connected with a beam connecting plate 13.

[0042] In this embodiment, the decorative panels 3 are all assembled and connected, and the plate seams 15 are pre-set at the oblique connecting beams 5 and the through holes are reserved; the decorative panels 3 are fluorocarbon sprayed aluminum single plates, and their thickness is not less than 3mm. The decorative panels 3 include a decorative inner plate 31 arranged at the inner side of the U-shaped opening 4 and located at the side of the root section 2 of the steel beam, a decorative top plate 32 arranged at the top of the U-shaped opening 4 and located at the top of the root section 2 of the steel beam, a decorative top side plate 33 arranged at the top of the U-shaped opening 4 and located at the top of the main structure ring edge 6, and a decorative bottom plate 34 arranged at the bottom of the U-shaped opening 4 and located at the bottom of the root section 2 of the steel beam.

[0043] In this embodiment, the decorative top plate 32 is locally arranged at the top of the steel beam root section 2, and the decorative top plate 32 is arranged on both sides of the top of the steel beam root section 2 in the long direction; and the top surface of the decorative top plate 32 is lower than the top surface of the decorative inner plate 31; the decorative top plate 32 and the decorative bottom plate 34 are both obliquely arranged as a whole, and they are inclined along the steel beam root section 2 toward the main structure ring edge 6.

[0044] In this embodiment, the main structure ring edge 6 is a rectangular beam body, and a decorative wing corbel 8 is also arranged on the top of the main structure ring edge 6; the corresponding joint seam of the decorative top edge plate 33 is arranged at the decorative wing corbel 8, and the decorative top edge plate 33 extends outward at the top of the main structure ring edge 6.

[0045] In this embodiment, an X-shaped oblique connecting beam 5 is provided at two continuous U-shaped openings 4, and the intersection of the X-shaped oblique connecting beam 5 is located in the middle of the common side of the two U-shaped openings 4. The supporting keel includes a primary keel 10 connected to the root section 2 of the steel beam or the decorative wing corbel 8, a secondary keel 11 connected between adjacent primary keels 10, and a tertiary keel 12 connected between two secondary keels 11 or between a secondary keel 11 and a primary keel 10; the primary keel 10 is fixedly connected to the root section 2 of the steel beam through a pre-connecting plate 14.

[0046] In this embodiment, the first-level keel 10 includes side beam members arranged along the upper and lower perimeters of the steel beam root section 2, U-shaped members between the two steel beam root sections 2, and annular edge members arranged upward and downward near the inner side of the steel beam root section 2 along the main structure ring edge 6; the second-level keel 11 is a connecting rod arranged circumferentially at intervals between upper and lower adjacent U-shaped members, a connecting rod between the U-shaped member and the adjacent side members in the horizontal direction, and a connecting rod between the U-shaped member and the annular edge member; the third-level keel 12 is an oblique rod arranged on the connecting rod to connect with other members.

[0047] Combination Figures 1 to 8 , further explain the installation method of the U-shaped decorative structure at the root of the steel structure beam, the specific steps are as follows:

[0048] Step 1: According to the design, the column (7) is first constructed, and then the radial steel beam (1) and the main structure ring edge (6) are assembled and constructed, wherein the steel beam root section (2) is butt-jointed after the radial steel beam (1) and the main structure ring edge (6) are constructed.

[0049] Step 2: Pre-arrange a corbel or connector connected to the oblique connecting beam (5) on the root section (2) of the steel beam, wherein a connector is arranged at the middle upper part of the root section (2) of the steel beam corresponding to the intersection of the two oblique connecting beams (5), and a corbel is arranged at the inner corner where the root section (2) of the steel beam is connected to the main structure ring edge (6).

[0050] Step 3: When constructing the root section (2) of the steel beam, a pre-connecting plate (14) is pre-installed. After the construction of the root section (2) of the steel beam is completed, a primary keel (10), a secondary keel (11) and a tertiary keel (12) are sequentially installed at the corresponding root section (2), the main structure ring edge (6) and the decorative wing corbel (8).

[0051] Step 4: For the segmentation of the veneer panel (3), three-dimensional modeling is first performed to segment the veneer panel (3) into panels that are easy to produce and hoist; wherein the oblique connecting beam (5) is formed by assembling two or more veneer panels (3) with a blank space, and the veneer panel (3) and the veneer panel strip (9) are integrally designed and manufactured, and the segmented panels are numbered and sorted.

[0052] Step 5: The finished decorative panel (3) is bent into a desired angle before installation and provided with back ribs at vertical intervals on the back side and fixed to the supporting keel by welding or by detachable and adjustable fixing with hanging parts, wherein at least the upper and lower parts of the decorative panel (3) are provided with curved back ribs in the vertical direction.

[0053] Step 6: The decorative panel strip (9) and the radial beam strip (102) in the radial steel beam (1) are connected in a butt-jointed manner, and a measurement and control point is set at the intersection to ensure installation accuracy; the gap at the intersection of the decorative panel (3) and the radial steel beam (1) is treated with glue; the assembly seams between the three decorative panels are sealed with glue, wherein the decorative panels (3) corresponding to the lower opening and the visible side surface are less than 10 mm wide and are not glued; thereby completing the construction of the U-shaped decorative structure at the root of the steel structure beam body.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that a technician familiar with the technical field can think of within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for installing a U-shaped decorative structure at the root of a steel structure beam, characterized in that: It comprises a radial steel beam (1), a steel beam root section (2) arranged at the extended end of the radial steel beam (1), a body structure ring edge connected to the extended end of the steel beam root section (2), a decorative panel (3) connected to the steel beam root section (2) and the main structure ring edge (6), a supporting keel connected between the decorative panel (3) and the steel beam root section (2), and an oblique connecting beam (5) connected between adjacent steel beam root sections (2); The main structure ring edge (6) is arranged in an elliptical ring shape or a circular ring shape, and the decorative panels (3) arranged at the root section of the steel beam (2) and the main structure ring edge (6) enclose a U-shaped opening (4) in a horizontal section, and the U-shaped opening (4) is arranged in a continuous W shape on the main structure ring edge (6); the U-shaped opening (4) is arranged in a trumpet shape from bottom to top vertically inside; The radial steel beam (1) is provided with a variable diameter at the connection point with the steel beam root section (2), and the variable diameter point is provided in a gradually expanding trumpet shape; the radial steel beam (1) comprises a radial beam body (101) and a radial beam belt (102) provided at the bottom of the radial beam body (101), and the radial beam belt (102) is in the shape of a slat and is provided on both sides of the bottom of the radial beam body (101) in the long direction; The bottom decorative panel (3) of the steel beam root section (2) is further provided with a decorative panel strip (9), the decorative panel strip (9) being arranged in an "I" shape on a steel beam root section (2) and being arranged in series with the radial beam strip (102); The installation method of the U-shaped decorative structure at the root of the steel structure beam is as follows: Step 1: First construct the column (7) according to the design, and then assemble and construct the radial steel beam (1) and the main structure ring edge (6), wherein the steel beam root section (2) is butt-jointed after the radial steel beam (1) and the main structure ring edge (6) are constructed; Step 2: pre-arrange a corbel or connector connected to the oblique connecting beam (5) on the root section (2) of the steel beam, wherein a connector is arranged at the middle upper part of the root section (2) of the steel beam corresponding to the intersection of the two oblique connecting beams (5), and a corbel is arranged at the inner corner where the root section (2) of the steel beam is connected to the main structure ring edge (6); Step 3: When constructing the root section of the steel beam (2), a pre-connecting plate (14) is pre-installed. After the construction of the root section of the steel beam (2) is completed, a primary keel (10), a secondary keel (11) and a tertiary keel (12) are sequentially installed at the corresponding positions of the root section of the steel beam (2), the main structure ring edge (6) and the decorative wing corbel (8); Step 4: For the veneer panel (3), three-dimensional modeling is first performed to divide the veneer panel (3) into panels that are easy to produce and hoist; wherein the oblique connecting beam (5) is formed by assembling two or more veneer panels (3) with a blank space, and the veneer panel (3) and the veneer panel belt (9) are integrally designed and manufactured; the divided panels are numbered and sorted; Step 5: The finished decorative panel (3) is bent into a desired angle before installation and provided with back ribs at intervals on the back side in the vertical direction and fixed to the supporting keel by welding or fixed in a detachable and adjustable manner by hanging parts, wherein at least the upper and lower parts of the decorative panel (3) in the vertical direction are provided with curved back ribs; Step 6: The decorative panel strip (9) and the radial beam strip (102) in the radial steel beam (1) are connected in a butt-jointed manner, and a measurement and control point is set at the intersection to ensure installation accuracy; the gap at the intersection of the decorative panel (3) and the radial steel beam (1) is treated with glue; the assembly seams between the decorative panels (3) are sealed with glue, wherein the decorative panels (3) corresponding to the lower opening and the visible side surface are less than 10 mm wide and are not glued; thereby completing the construction of the U-shaped decorative structure at the root of the steel structure beam body.

2. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 1, characterized in that: The radial steel beam (1) is rectangular and gradually becomes smaller inward at the connection with the steel beam root section (2); the steel beam root section (2) is a U-shaped beam, and the upper flange plate and the lower flange plate at the connection with the radial steel beam (1) are gradually expanded; the upper flange plate of the steel beam root section (2) and the top plate of the radial steel beam (1) are also connected by a beam connecting plate (13).

3. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 2, characterized in that: The decorative panels (3) are all assembled and connected, and the panel seams (15) are pre-set in blocks at the oblique connecting beams (5) and holes for connection are reserved; the decorative panels (3) are fluorocarbon sprayed aluminum veneers with a thickness of not less than 3 mm.

4. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 3, characterized in that: The decorative panel (3) comprises a decorative inner panel (31) arranged at the inner side of the U-shaped opening (4) and located at the side of the root section (2) of the steel beam, a decorative top panel (32) arranged at the top of the U-shaped opening (4) and located at the top of the root section (2) of the steel beam, a decorative top side panel (33) arranged at the top of the U-shaped opening (4) and located at the top of the main structure ring edge (6), and a decorative bottom panel (34) arranged at the bottom of the U-shaped opening (4) and located at the bottom of the root section (2) of the steel beam.

5. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 4, characterized in that: The decorative top plate (32) is locally arranged at the top of the steel beam root section (2), and the decorative top plate (32) is arranged on both sides of the top of the steel beam root section (2) in the long direction; and the top surface of the decorative top plate (32) is arranged lower than the top surface of the decorative inner plate (31); the decorative top plate (32) and the decorative bottom plate (34) are arranged obliquely as a whole, and are inclined along the steel beam root section (2) toward the main structure ring edge (6).

6. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 5, characterized in that: The main structure ring edge (6) is a rectangular beam body, and a decorative wing corbel (8) is also arranged on the top of the main structure ring edge (6); the corresponding joint seam of the decorative top edge plate (33) is arranged at the decorative wing corbel (8), and the decorative top edge plate (33) protrudes outward from the top of the main structure ring edge (6).

7. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 6, characterized in that: X-shaped oblique connecting beams (5) are provided at two continuous U-shaped openings (4), and the intersection of the X-shaped oblique connecting beams (5) is located in the middle of the common side of the two U-shaped openings (4).

8. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 7, characterized in that: The supporting keel comprises a primary keel (10) connected to the root section of the steel beam (2) or the decorative wing corbel (8), a secondary keel (11) connected between adjacent primary keels (10), and a tertiary keel (12) connected between two secondary keels (11) or between a secondary keel (11) and a primary keel (10); the primary keel (10) is fixedly connected to the root section of the steel beam (2) via a pre-connecting plate (14).

9. The method for installing a U-shaped decorative structure at the root of a steel structure beam as claimed in claim 8, characterized in that: The first-level keel (10) comprises side beam members arranged along the upper and lower perimeters of the steel beam root section (2), a U-shaped member between two steel beam root sections (2), and a ring edge member arranged vertically on the inner side of the main structure ring edge (6) adjacent to the steel beam root section (2); the second-level keel (11) comprises connecting rods arranged circumferentially between upper and lower adjacent U-shaped members, connecting rods between the U-shaped members and adjacent side rods in the horizontal direction, and connecting rods between the U-shaped members and the ring edge members; the third-level keel (12) comprises an oblique rod arranged on the connecting rod to connect with other members.

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