A prefabricated connection node structure for the eaves and columns of a steel-structure residential building

Abstract

This utility model discloses a prefabricated connection node structure for the eaves and columns of a steel structure residential building, including cold-formed C-shaped steel columns, cold-formed rolled-edge angle steel columns, and a roof steel frame. The tops of the cold-formed C-shaped steel columns and the cold-formed rolled-edge angle steel columns are respectively provided with corresponding middle and end roof steel frames for insertion. At the lower eaves of the middle and end roof steel frames, respectively, are provided lower crossbars of the steel frame and first and second inserted steel pipe sections. Sealing plates and sealing bending plates are respectively provided at the tops of the cold-formed C-shaped steel columns and the cold-formed rolled-edge angle steel columns. After each inserted steel pipe section is inserted into each steel column, they are connected and fixed using fastener bolts. This prefabricated connection node structure for the eaves and columns of a steel structure residential building can effectively improve installation efficiency and reduce on-site construction costs, and has the advantages of simple structure, convenient manufacturing, quick construction, and reliable assembly.

Description

Technical Field

[0001] This utility model relates to the field of connection node technology for steel structure residential buildings, specifically a prefabricated connection node structure for the eaves cover and column of a steel structure residential building. Background Technology

[0002] In steel-structure residential buildings, steel columns are typically made of rectangular steel tubing or steel boxes. At the eaves, the connection between the roof steel frame and the steel columns is usually welded or bolted. The former is suitable for factory prefabrication and should be avoided for on-site installation, while the latter is suitable for on-site installation.

[0003] However, the above-mentioned connection method has the disadvantage of exposed bolt ends that are difficult to conceal, affecting the installation of wall insulation boards, roof insulation boards, or decorative facing materials. Furthermore, it is difficult to fill the inner cavity of the steel column with insulation material, significantly reducing the insulation effect of the building walls at the steel column section. To ensure the reliability of the connection between the roof steel frame and the steel column while minimizing interference with the installation of wall insulation boards, roof insulation boards, or decorative facing materials, this utility model provides a connection node structure and assembly method suitable for on-site installation. Utility Model Content

[0004] The purpose of this utility model is to provide a prefabricated connection node structure between the roof cover and the column at the eaves of a steel structure residential building, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated connection node structure for the eaves and columns of a steel structure residential building, including cold-formed C-shaped steel columns and a central roof steel frame, cold-formed rolled-edge angle steel columns and an end roof steel frame. The central and end roof steel frames are inserted into the tops of the cold-formed C-shaped steel columns and the cold-formed rolled-edge angle steel columns at the lower crossbars of the steel frames. A first and a second inserted steel pipe section are respectively installed below the lower crossbars of the central and end roof steel frames. A first steel plate and a sealing plate, and a second steel plate and a sealing bending plate are respectively installed at the tops of the cold-formed C-shaped steel columns and the cold-formed rolled-edge angle steel columns. A third and a fourth steel plate are respectively installed at the bottom of the inner cavity of the first and second inserted steel pipe sections. Fastener bolts are vertically installed between the first and third steel plates and between the second and fourth steel plates to connect and fix the central and end roof steel frames to the cold-formed C-shaped steel columns and the cold-formed rolled-edge angle steel columns.

[0006] Furthermore, the central roof steel frame and the end roof steel frame are connected to the top of the cold-formed C-shaped steel column and the cold-formed rolled angle steel column respectively by the lower crossbar of the steel frame and the first insert steel pipe section, the lower crossbar of the end steel frame and the second insert steel pipe section welded together, in an insert-fitting connection. The sealing plate and the sealing bending plate seal the opening section at the top of the cold-formed C-shaped steel column and the cold-formed rolled angle steel column to form a closed pipe. The fastener bolts connect the central roof steel frame and the end roof steel frame to the third steel plate at the top of the cold-formed C-shaped steel column and the fourth steel plate at the top of the cold-formed rolled angle steel column respectively by the first steel plate in the first insert steel pipe section and the second steel plate in the second insert steel pipe section, so that the central roof steel frame and the end roof steel frame are combined with the cold-formed C-shaped steel column and the cold-formed rolled angle steel column and fixed together as a rigid body.

[0007] Furthermore, the cold-formed C-shaped steel column and the cold-formed rolled-edge angle steel column are cold-formed open steel sections, and the opening length of the cross-section of the cold-formed C-shaped steel column and the cold-formed rolled-edge angle steel column is less than the solid side length.

[0008] Furthermore, at a predetermined position below the top surface of each of the cold-formed C-shaped steel column and the cold-formed rolled-edge angle steel column, a steel plate perpendicular to the column axis is welded inside the cavity of each column. Holes for inserting fasteners are pre-drilled on the steel plates inside the columns. Additionally, sealing plates and sealing bending plates are welded to the top of the opening surfaces of the columns, so that the openings at the top of the columns form closed tubular sections.

[0009] Furthermore, the central roof steel frame and the end roof steel frame are welded from structural steel, and the lower edge of the central roof steel frame and the end roof steel frame at the eaves position is the corresponding lower crossbar of the end steel frame, which is made of cold-bent folded steel.

[0010] Furthermore, the first and second insert steel pipe sections have rectangular or square cross-sections, and a third and fourth steel plate perpendicular to the steel pipe axis are welded to the bottom of the pipe cavity, respectively. Holes for inserting fastener bolts are pre-drilled on each steel plate. Appropriate notches are cut on the corresponding surfaces of the first and second insert steel pipe sections facing the opening edges of the cold-formed C-shaped steel column and the cold-formed rolled angle steel column for the installation of fastener bolts.

[0011] Furthermore, the top surfaces of the first and second inserted steel pipe sections are vertically welded to the bottom of the corresponding lower crossbars of the middle and end roof steel frames, respectively, so that each middle and end roof steel frame can be reliably inserted into the corresponding cold-formed C-shaped steel column and cold-formed rolled-edge angle steel column.

[0012] Furthermore, the first and second insert steel pipe sections on the central and end roof steel frames are inserted into the top cavities of the corresponding cold-formed C-shaped steel columns and cold-formed rolled-edge angle steel columns. Each section is then connected to the third steel plate in the first insert steel pipe section with the first steel plate in the cold-formed C-shaped steel column, and the fourth steel plate in the second insert steel pipe section with the second steel plate in the cold-formed rolled-edge angle steel column, using a set of fastener bolts to reliably fix the central and end roof steel frames together.

[0013] This utility model provides a prefabricated connection node structure between the eaves cover and column of a steel structure residential building, which has the following beneficial effects:

[0014] 1. This utility model uses open-type cold-formed steel columns to replace conventional steel pipe columns, so that the fasteners are hidden as much as possible. A set of vertical steel pipe sections are welded at the position of the steel column corresponding to the lower horizontal bar at the eaves of each roof steel frame to ensure the stress rigidity of the joint. This makes the overall structure simple and easy to manufacture. The lower horizontal bar of the steel column and the roof steel frame can be processed and formed using ordinary bending equipment, and the steel pipe sections can be cut from the purchased pipe materials.

[0015] 2. This utility model involves welding corresponding steel plates to the bottom of the upper cavity of the cold-formed steel column and the inner cavity of the steel pipe section. Holes for fasteners are pre-drilled on these plates. When installing each roof section, the steel pipe section is inserted directly into the top of the corresponding steel column, and then fastened to secure them. This method ensures quick construction and reliable assembly. For each roof section, installation simply requires inserting the steel pipe section directly into the top of the corresponding steel column and securing it with fasteners; on-site welding is unnecessary, guaranteeing reliable joint connections.

[0016] 3. In this utility model, since the steel column is an open cold-formed steel, the cavity can be directly filled with insulation material, and then the opening can be sealed, so that the insulation performance of the house wall at the location of the steel column can be basically guaranteed. Attached Figure Description

[0017] Figure 1 This is a front view structural schematic diagram of the prefabricated connection node structure between the eaves cover and column of a steel structure residential building according to this utility model.

[0018] Figure 2 This is a left-side view of the main body of the prefabricated connection node structure between the eaves cover and column of a steel structure residential building according to this utility model.

[0019] Figure 3 This is a top view schematic diagram of the main body of the prefabricated connection node structure between the eaves cover and column of a steel structure residential building according to this utility model.

[0020] Figure 4This is a front view schematic diagram of the main body structure of the prefabricated connection node structure between the eaves cover and column of a steel structure residential building according to this utility model.

[0021] Figure 5 This is a schematic diagram of the left side of the main body of the prefabricated connection node structure between the eaves cover and the column of a steel structure residential building according to this utility model.

[0022] Figure 6 This is a top view schematic diagram of the main body structure of the prefabricated connection node structure between the eaves cover and column of a steel structure residential building according to this utility model.

[0023] Figure 7 This is a schematic diagram of the upper half of the sectional elevation view of the steel structure residential building along axes B, C, and D, showing the prefabricated connection node structure between the eaves cover and column of the building according to the present invention.

[0024] Figure 8 This is a schematic diagram of the elevation structure of a steel structure residential building with an assembled connection node between the eaves cover and the column along the A and E axes.

[0025] In the diagram: 1. Cold-formed C-shaped steel column; 2. Cold-formed rolled-edge angle steel column; 3. Middle roof steel frame; 4. End roof steel frame; 5. First inserted steel pipe section; 6. Second inserted steel pipe section; 7. Sealing plate; 8. Sealing bending plate; 9. Fastener bolts; 10. First steel plate; 11. Second steel plate; 12. Lower crossbar of steel frame; 13. Lower crossbar of end steel frame; 14. Third steel plate; 15. Fourth steel plate. Detailed Implementation

[0026] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0027] like Figures 1 to 8As shown, a prefabricated connection node structure for the eaves and columns of a steel structure residential building includes cold-formed C-shaped steel columns 1, a central roof steel frame 3, cold-formed rolled-edge angle steel columns 2, and an end roof steel frame 4. The central section between the cold-formed rolled-edge angle steel columns 2 and the end roof steel frames 4 at axes A and E at both ends of the building consists of cold-formed C-shaped steel columns 1 and the central roof steel frame 3. A lower horizontal bar 12 and a first inserted steel pipe section 5 are welded to the lower end of the central roof steel frame 3. A lower horizontal bar 13, a first inserted steel pipe section 5, and a second inserted steel pipe section 6 are welded to the lower end of the end roof steel frame 4. A sealing plate 7 and a sealing bending plate 8 are welded to the top of the cold-formed C-shaped steel columns 1 and the top of the cold-formed rolled-edge angle steel columns 2, respectively, to open the edges of the cold-formed C-shaped steel columns 1 and the cold-formed rolled-edge angle steel columns 2. A closed tube is formed at the top; the middle roof steel frame 3 and the end roof steel frame 4 can be connected to the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 respectively through the first insertion steel pipe section 5 and the second insertion steel pipe section 6; fastener bolts 9 are vertically installed between the first insertion steel pipe section 5 and the second insertion steel pipe section 6 and the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 at the insertion point. The fastener bolts 9 pass through the first steel plate 10 welded to the top of the cold-formed C-shaped steel column 1, the third steel plate 14 welded to the bottom of the inner cavity of the first insertion steel pipe section 5, the second steel plate 11 welded to the top of the cold-formed rolled-edge angle steel column 2, and the fourth steel plate 15 welded to the bottom of the inner cavity of the second insertion steel pipe section 6, so that the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 are fixed into a rigid body.

[0028] like Figures 1 to 8 As shown, the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 are cold-formed open steel sections, and the opening length of the cross-section of the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 is less than the solid side length; at a predetermined position below the top surface of the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2, a first steel plate 10 and a second steel plate 11 perpendicular to the column axis are welded to the cavity of each cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2, and each steel plate is prefabricated with through-bolts 9. The openings of the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 are respectively welded with sealing plate 7 and sealing bending plate 8, so that the openings of the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 at the top form a closed tube shape; the middle roof steel frame 3 and the end roof steel frame 4 are welded from steel profiles, and the lower crossbars 12 and 13 of the steel frame at the eaves of the middle roof steel frame 3 and the end roof steel frame 4 are cold-formed rolled-edge steel profiles.

[0029] like Figures 1 to 8As shown, the first insert-connected steel pipe section 5 and the second insert-connected steel pipe section 6 have rectangular or square cross-sections. A third steel plate 14 and a fourth steel plate 15, perpendicular to the steel pipe axis, are welded into the bottom cavity of each section. Each steel plate has pre-drilled holes for inserting fastener bolts 9. Appropriate notches are cut on the corresponding surfaces of the pipe walls of the first insert-connected steel pipe section 5 and the second insert-connected steel pipe section 6 facing the opening edges of the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 for the installation of fastener bolts 9. The top surfaces of the first insert-connected steel pipe section 5 and the second insert-connected steel pipe section 6 are aligned with the lower crossbars 12 and 13 of the middle roof steel frame 3 and the end roof steel frame 4. The lower surfaces are vertically welded to ensure that the middle roof steel frame 3 and the end roof steel frame 4 of each frame can be reliably inserted into the corresponding cold-formed C-shaped steel column 1 and cold-formed rolled-edge angle steel column 2. The first inserted steel pipe section 5 on the middle roof steel frame 3 and the second inserted steel pipe section 6 on the end roof steel frame 4 are inserted into the top cavity of the corresponding cold-formed C-shaped steel column 1 and cold-formed rolled-edge angle steel column 2. The corresponding sets of fastener bolts 9 are passed through the holes in the first steel plate 10, the third steel plate 14, the second steel plate 11 and the fourth steel plate 15 to reliably fix the middle roof steel frame 3 and the end roof steel frame 4 to the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 as a whole.

[0030] In summary, as Figures 1 to 8 As shown, the prefabricated connection structure between the eaves and columns of this steel-structured residential building involves prefabricating the building into sections or parts in a factory before on-site installation. These components are then transported to the construction site for assembly. Figure 7-8 The diagram shows that the house is divided into four sections: AB, BC, CD, and DE, and the components are prefabricated and assembled using symmetrically arranged steel columns and roof steel frames.

[0031] like Figure 7 The diagram shown is a vertical view of the connection between the roof steel frame and steel columns at the eaves of the central section of the building, along axes B, C, and D. Figure 1-3 It is attached Figure 2 A breakdown diagram of the eaves joint.

[0032] For the connection between the cold-formed C-shaped steel columns 1 of sections BC and CD in the middle section of the building and the middle roof steel frame 3 at the eaves, the middle roof steel frame 3 is connected to the cold-formed C-shaped steel column 1 at the top of the cold-formed C-shaped steel column 1 by the first insert steel pipe section 5 which is welded to it as a whole. The sealing plate 7 seals the open section at the top of the cold-formed C-shaped steel column 1 to form a closed pipe. The middle roof steel frame 3 is fixed to the cold-formed C-shaped steel column 1 as a rigid body by the third steel plate 14 in the first insert steel pipe section 5 and the first steel plate 10 in the top of the cold-formed C-shaped steel column 1 through the fastener bolts 9.

[0033] For the cold-formed C-shaped steel column 1, a first steel plate 10 with a planar dimension matching the cross-section of the column cavity is welded to the solid edge of the cold-formed C-shaped steel column 1 at a set position below the top surface of the column to strengthen the rigidity of the column top; holes for fastener bolts 9 to be inserted are pre-drilled in the steel plate.

[0034] Prefabricate the central roof steel frame 3 of each truss and equip it with two first insertion steel pipe sections 5. First, make a small notch at the bottom of the pipe section to facilitate the assembly of fasteners 9. Then, weld a third steel plate 14 at the bottom of the inner cavity of each pipe section. Pre-drill holes in the steel plate for fastener bolts 9 to be inserted.

[0035] Weld the first insert steel pipe section 5 of the two sections perpendicularly to the lower surface of the lower crossbar 12 of the steel frame at the set position of the middle roof steel frame 3. After each pair of cold-formed C-shaped steel columns 1 on axes B, C, and D on axes 1 and 2 is installed, insert the first insert steel pipe section 5 of the two pairs of four middle roof steel frames 3 into the cavity at the top of the corresponding cold-formed C-shaped steel column 1. Then, at the ridge joint of each pair of middle roof steel frames 3, connect and fix them with fasteners.

[0036] Then, for each first inserted steel pipe segment 5 inserted into the cold-formed C-shaped steel column 1, the middle roof steel frame 3 is connected and fixed to the cold-formed C-shaped steel column 1 by fastener bolts 9 through the first steel plate 10 in the top cavity of the cold-formed C-shaped steel column 1 and the third steel plate 14 in the bottom cavity of the first inserted steel pipe segment 5.

[0037] As attached Figure 8 The diagram shows the eaves at both ends of the building, viewed from outside the elevations along axes A and E, where the roof and steel columns connect; (Attached) Figure 4-6 It is attached Figure 8 A breakdown diagram of the eaves area.

[0038] For the connection between the cold-formed C-shaped steel columns 1 and cold-formed rolled-edge angle steel columns 2 at the two ends of the building (AB and DE sections) and the end roof steel frame 4 at the eaves, the end roof steel frame 4 is connected to the top of the cold-formed C-shaped steel columns 1 and cold-formed rolled-edge angle steel columns 2 by the first insert steel pipe section 5 and the second insert steel pipe section 6, which are welded together. The sealing bending plate 8 seals the open section at the top of the cold-formed rolled-edge angle steel column 2 to form a closed pipe. Fastener bolts 9 are used to fix the end roof steel frame 4 to the cold-formed C-shaped steel columns 1 and cold-formed rolled-edge angle steel columns 2 as a rigid body through the third steel plate 14 in the first insert steel pipe section 5, the first steel plate 10 in the top of the cold-formed C-shaped steel column 1, the fourth steel plate 15 in the second insert steel pipe 6, and the second steel plate in the top of the cold-formed rolled-edge angle steel column 2.

[0039] For the cold-formed and rolled-edge angle steel column 2, a second steel plate 11 that matches the cross-section of the inner cavity of the cold-formed and rolled-edge angle steel column 2 is welded to the solid edge of the cold-formed and rolled-edge angle steel column 2 at a set position below the top surface of the cold-formed and rolled-edge angle steel column 2 to strengthen the rigidity of the column top; holes for fastener bolts 9 to be inserted are pre-made in the second steel column steel plate 11.

[0040] Each end roof steel frame 4 is prefabricated, and a first insert steel pipe section 5 and a second insert steel pipe section 6 are prepared for it. First, a small notch is opened at the bottom of each pipe section to facilitate the assembly of fasteners 9. Then, a third steel plate 14 and a fourth steel plate 15 are welded to the bottom of the inner cavity of each pipe section. Holes for fastener bolts 9 are pre-drilled in each steel plate.

[0041] The first insert steel pipe section 5 and the second insert steel pipe section 6 are welded perpendicularly to the lower surface of the lower crossbar 13 of the end roof steel frame at the set position of the end roof steel frame 4. After each pair of cold-bent rolled edge angle steel columns 2 on axes A and E on axes 1 and 2 are installed, the first insert steel pipe section 5 and the second insert steel pipe section 6 on the two pairs of four end roof steel frames are respectively inserted into the cavities at the top of the corresponding cold-bent C-shaped steel column 1 and cold-bent rolled edge angle steel column 2. Then, at the ridge joint of each pair of end roof steel frames 4, they are connected and fixed with fasteners.

[0042] Then, for each inserted cold-formed C-shaped steel column 1 and cold-formed rolled-edge angle steel column 2, the first inserted steel pipe section 5 and the second inserted steel pipe section 6 are connected and fixed to the end roof steel frame 4 with the cold-formed C-shaped steel column 1 and the cold-formed rolled-edge angle steel column 2 by fastener bolts 9 through the first steel plate 10 in the top cavity of the cold-formed C-shaped steel column 1, the third steel plate 14 in the bottom cavity of the first inserted steel pipe section 5, the second steel plate 11 in the top cavity of the cold-formed rolled-edge angle steel column 2, and the steel plate 15 in the bottom cavity of the second inserted steel pipe section 6.

[0043] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A prefabricated connection node structure for the eaves and columns of a steel structure residential building, comprising cold-formed C-shaped steel columns (1), a central roof steel frame (3), cold-formed rolled-edge angle steel columns (2), and end roof steel frames (4), characterized in that: The top of the cold-formed C-shaped steel column (1) and the top of the cold-formed rolled-edge angle steel column (2) are respectively provided with corresponding middle roof steel frame (3) and end roof steel frame (4) for insertion. The lower eaves of the middle roof steel frame (3) and the end roof steel frame (4) are respectively provided with steel frame lower crossbar (12) and first inserted steel pipe section (5), end steel frame lower crossbar (13) and second inserted steel pipe section (6); at the top of the cold-formed C-shaped steel column (1) and the top of the cold-formed rolled-edge angle steel column (2) Each part is provided with a sealing plate (7) and a first steel plate (10), a sealing bending plate (8) and a second steel plate (11), and a third steel plate (14) and a fourth steel plate (15) are provided at the bottom of the first insert steel pipe section (5) and the bottom of the second insert steel pipe section (6), respectively; fastener bolts (9) are vertically installed between the first steel plate (10) and the third steel plate (14) and between the second steel plate (11) and the fourth steel plate (15) to fix them respectively.

2. The connection structure of claim 1, wherein the connection structure is characterized by: The middle roof steel frame (3) and the end roof steel frame (4) are connected to the top of the cold-formed C-shaped steel column (1) and the cold-formed rolled angle steel column (2) respectively by the steel frame lower crossbar (12) welded together with them, the first insert steel pipe section (5), the end steel frame lower crossbar (13) and the second insert steel pipe section (6) respectively, in an insert-fitting connection. The sealing plate (7) and the sealing bending plate (8) seal the open section at the top of the cold-formed C-shaped steel column (1) and the cold-formed rolled angle steel column (2) to form a closed pipe. The fastener bolts (9) connect the middle roof steel frame (3) and the end roof steel frame (4) respectively through the first steel plate (10) in the first insertion steel pipe section (5) and the second steel plate (11) in the second insertion steel pipe section (6) to the third steel plate (14) at the top of the cold-formed C-shaped steel column (1) and the fourth steel plate (15) at the top of the cold-formed rolled edge angle steel column (2), so that the middle roof steel frame (3) and the end roof steel frame (4) are combined with the cold-formed C-shaped steel column (1) and the cold-formed rolled edge angle steel column (2) and fixed together as a rigid body.

3. The connection structure of claim 1, wherein the connection structure is characterized by: The cold-formed C-shaped steel column (1) and the cold-formed rolled-edge angle steel column (2) are cold-formed open steel sections, and the opening length of the cross section of the cold-formed C-shaped steel column (1) and the cold-formed rolled-edge angle steel column (2) is less than the solid side length.

4. The connection structure of claim 1, wherein the connection structure is characterized by: The top of the cold-formed C-shaped steel column (1) and the cold-formed rolled-edge angle steel column (2) are each welded with a steel plate perpendicular to the column axis at a position set below the top surface of the cold-formed C-shaped steel column (1) and the cold-formed rolled-edge angle steel column (2). The steel plates inside the cold-formed C-shaped steel column (1) and the cold-formed rolled-edge angle steel column (2) have pre-made holes for inserting fasteners. Moreover, the opening surfaces of the cold-formed C-shaped steel column (1) and the cold-formed rolled-edge angle steel column (2) are respectively welded with a sealing plate (7) and a sealing bending plate (8) at the top, so that the opening part of the cold-formed C-shaped steel column (1) and the cold-formed rolled-edge angle steel column (2) at the top forms a closed tube shape.

5. The connection structure of claim 1, wherein the connection structure is characterized by: The middle roof steel frame (3) and the end roof steel frame (4) are welded from steel profiles, and the lower crossbars (12) and (13) of the steel frame corresponding to the eaves of the middle roof steel frame (3) and the end roof steel frame (4) are cold-bent folded steel profiles.

6. The connection structure of claim 1, wherein the connection structure is characterized by: The first insert steel pipe section (5) and the second insert steel pipe section (6) are rectangular or square cross sections. A third steel plate (14) and a fourth steel plate (15) perpendicular to the steel pipe axis are welded to the bottom of the pipe cavity. Holes for inserting fastener bolts (9) are pre-made on each steel plate. Suitable notches are cut on the corresponding surfaces of the first insert steel pipe section (5) and the second insert steel pipe section (6) facing the opening edge of the cold-bent C-shaped steel column (1) and the cold-bent rolled angle steel column (2) for the installation of fastener bolts (9).

7. The connection structure of claim 1, wherein the connection structure is characterized by: The top surfaces of the first inserted steel pipe section (5) and the second inserted steel pipe section (6) are respectively welded vertically to the bottom of the lower crossbar (12) of the middle roof steel frame (3) and the lower crossbar (13) of the end roof steel frame (4), so that each middle roof steel frame (3) and end roof steel frame (4) can be reliably inserted into the corresponding cold-formed C-shaped steel column (1) and cold-formed rolled edge angle steel column (2).

8. The connection structure of claim 1, wherein, The first insert steel pipe section (5) and the second insert steel pipe section (6) on the middle roof steel frame (3) and the end roof steel frame (4) are inserted into the top cavity of the corresponding cold-formed C-shaped steel column (1) and cold-formed rolled edge angle steel column (2). Each is connected with a set of fastener bolts (9) to the third steel plate (14) in the first insert steel pipe section (5) and the first steel plate (10) in the cold-formed C-shaped steel column (1), and the fourth steel plate (15) in the second insert steel pipe section (6) and the second steel plate (11) in the cold-formed rolled edge angle steel column (2), so that the middle roof steel frame (3) and the end roof steel frame (4) are reliably fixed together.

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