Assembly structure of assembly type steel building

Abstract

The utility model discloses an assembly structure of an assembly type steel building, which comprises long beams, short beams and connecting pieces respectively connected with the long beams and the short beams, the long beams and the short beams are encircled to form a rectangular frame, a plurality of secondary beams are connected in the rectangular frame, two ends of each secondary beam are connected with the long beams through riveting pieces, and the connecting pieces are connected with the long beams through riveting pieces. The riveting piece is a hippocampus rivet and / or a puncture rivet. In the field of container houses, a cold treatment mode is adopted during riveting, residual stress is reduced, and therefore the service life of the fabricated house is prolonged. And in addition, the risk that flammable materials are ignited in the welding process is avoided, and higher steel strength can be selected for connection.

Description

Technical Field

[0001] The present application relates to the field of prefabricated buildings, and in particular to an assembly structure of a prefabricated steel building. Background Art

[0002] Prefabricated buildings are the result of the rapid development of building industrialization. Their core concept is standardized, prefabricated, and assembled spatial modules. Container homes, as a typical example of modular construction, have created a novel, lively, and unprecedented architectural image in modern society.

[0003] Container houses generally include vertical structures (walls) and horizontal structures (floors). Due to the uncertainty of the on-site environment, the docking between components also requires a long time to position and correct, which prolongs the construction time. In order to reduce the on-site construction time, the existing horizontal structures are mostly connected by welding. This heat treatment method will produce residual stress and deformation for this type of prefabricated house. There are many connection points, which will seriously reduce the service life. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned shortcomings of the prior art and provide an assembled structure of a prefabricated steel building, which does not require factory welding, reduces the tedious steps brought about by welding, and shortens the construction time.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] An assembly structure for a prefabricated steel building includes long beams, short beams, and connectors connected to the long beams and short beams respectively. The long beams and short beams together form a rectangular frame. Multiple secondary beams are connected within the rectangular frame. The ends of the secondary beams are connected to the long beams via rivets, which are seahorse rivets and / or piercing rivets.

[0007] Preferably, there are multiple secondary beams, and adjacent secondary beams are connected by connecting beams.

[0008] Preferably, the secondary beams are further provided with connecting grooves, and the connecting beams pass through the connecting grooves of the secondary beams and are riveted to the short beams at both ends.

[0009] Preferably, the connecting groove has a rolled edge, the connecting beam is a channel steel, and the upper flange and the lower flange of the connecting beam are fixedly connected to the rolled edge.

[0010] Preferably, the connecting groove is a waist-shaped hole, and the length of the waist-shaped hole is 80mm-120mm.

[0011] Preferably, the web of the connecting beam is extended and has a first bent portion, and the first bent portion is riveted to the short beam.

[0012] Preferably, the connecting beam is C150 maraging steel.

[0013] Preferably, the spacing between adjacent secondary beams is 350 mm to 450 mm.

[0014] Preferably, the long beam, the short beam and the secondary beam are made of C200, C250 or C300 maraging steel.

[0015] In summary, the present invention has the following beneficial technical effects:

[0016] In the field of container housing, the use of cold treatment during riveting reduces residual stress, thereby increasing the service life of prefabricated housing. It also avoids the risk of igniting flammable materials during welding and allows the selection of higher-strength steel for connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a partial structural diagram of the utility model.

[0019] Figure 3 It is a schematic diagram of the connection between the long beam, the short beam and the connecting piece in the utility model.

[0020] Figure 4 It is an exploded schematic diagram of the long beam, short beam and connecting parts in the utility model.

[0021] Figure 5 It is a cross-sectional schematic diagram of the connection between the main beam and the connecting piece in the utility model.

[0022] Figure 6 It is a schematic diagram of the exploded structure of the connecting piece in the utility model.

[0023] Figure 7 It is a schematic diagram of the connection position of the main beam and the secondary beam in the utility model.

[0024] Figure 8 It is an exploded schematic diagram of the connection position of the main beam and the secondary beam in the utility model.

[0025] Explanation of the reference numerals: 1. Main beam; 11. Long beam; 12. Short beam; 13. Main web; 131. Riveted hole; 132. Countersunk protrusion; 14. Main upper flange plate; 141. Main upper bent plate; 15. Main lower flange plate; 151. Main lower bent plate; 16. Second mounting hole; 17. Main beam countersunk hole; 2. Secondary beam; 21. Connecting groove; 22. Connecting beam; 222. First bent plate; 23. Secondary web; 231. Secondary web bent plate; 24. Secondary upper flange plate; 241. Secondary upper Bent plate; 25, secondary lower flange plate; 251, secondary lower bent plate; 26, through-hole; 27, reinforcing beam; 271, second bent plate; 28, curling; 3, connecting piece; 31, first connecting plate; 311, connecting extension plate; 312, first assembly hole; 32, second connecting plate; 321, weight-reducing hole; 322, ear plate; 323, bent mouth; 33, cover plate; 331, chamfer; 332, first mounting hole; 333, positioning hole; 34, corner countersunk hole; 35, transition section. DETAILED DESCRIPTION

[0026] The terms "up," "down," "left," "right," "front," "back," "front," "back," "top," and "bottom" mentioned or potentially mentioned in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may vary depending on their location or usage. Therefore, these or other directional terms should not be interpreted as restrictive. In addition, the terms "first," "second," "third," and similar expressions are used only for descriptive and distinguishing purposes and should not be understood to indicate or imply the relative importance of the corresponding components.

[0027] The following is combined with Figure 1 -Attached Figure 8 This application is described in further detail.

[0028] The embodiments of the present application disclose an assembly structure of a prefabricated steel building.

[0029] Reference Figure 1 and Figure 2 An assembly structure for a prefabricated steel building includes a main beam 1 and connectors 3. The main beam 1 includes a long beam 11 and a short beam 12. The connectors 3 are used to connect the long beams 11 and the short beams 12. Two long beams 11 and two short beams 12 are surrounded by four connectors 3 to form a rectangular frame. Multiple secondary beams 2 are connected to the rectangular frame. The ends of the secondary beams 2 are connected to the long beams 11 by rivets. The secondary beams 2 also have connecting grooves 21, and connecting beams 22 are arranged in the connecting grooves 21. The connecting beams 22 pass through the connecting grooves 21 of each secondary beam 2 and are riveted to the short beams 12 at both ends to form a horizontal structure used as a floor.

[0030] The main beam 1 is made of C300 or C250 maraging steel, specifically a single-sided channel steel. The height of the main beam 1 is 280 mm to 300 mm; in this embodiment, the height of the main beam 1 is preferably 300 mm. The flange width of the main beam 1 is 90 mm to 100 mm, and in this embodiment, the flange width of the main beam 1 is preferably 90 mm. The thickness of the main beam 1 is 2.5 mm to 3.5 mm; in this embodiment, the thickness of the main beam 1 is preferably 4.5 mm.

[0031] The long beam 11 and the short beam 12 have the same structure, but are different in length. In other embodiments, the short beams 12 can be connected to each other, or the long beams 11 can be connected to each other, so as to form a square frame.

[0032] Reference Figure 3-Figure 6 The connector 3 includes a first connecting plate 31 and a second connecting plate 32, each bent at a 90° angle. Extension plates 311 are provided on either side of the first connecting plate 31, each at the same height as the first connecting plate 31. The first connecting plate 31 defines a first assembly hole 312, designed to facilitate the installation of external accessories on the first connecting plate 31. The second connecting plate 32 defines a weight-reducing hole 321 corresponding to the position of the first assembly hole 312. The weight-reducing hole 321 reduces the amount of steel used in the connector 3, thereby reducing the weight of the structure.

[0033] Reference Figure 3-Figure 6 The upper and lower ends of the second connecting plate 32 are respectively provided with ear plates 322 corresponding to the connecting extension plate 311. There are four ear plates 322, and they are distributed in pairs at the upper and lower ends of the bent second connecting plate 32.

[0034] Reference Figure 3-Figure 6 The first connecting plate 31 and the connecting extension plate 311 are an integrally formed structure, and the first connecting plate 31 and the connecting extension plate 311 can be punched out by a punch press. The second connecting plate 32 and the ear plate 322 are an integrally formed structure, and the second connecting plate 32 and the ear plate 322 can also be punched out by a punch press. The ear plate 322 is bent 90° on the second connecting plate 32, and the upper and lower ends of the bending part of the second connecting plate 32 are provided with bending openings 323, which are arranged to facilitate the bending operation of the ear plate 322.

[0035] Reference Figure 3-Figure 6 The first connecting plate 31 is fixed to the second connecting plate 32. The first connecting plate 31 and the second connecting plate 32 are welded and fixed to form a column with upper and lower openings. The column is a cube with upper and lower openings. The upper and lower ends of the column are respectively welded with cover plates 33. The contour of the cover plate 33 is adapted to the inner circumference contour of the column. The upper and lower cover plates 33 are respectively sealed and installed on the upper and lower openings of the column.

[0036] The four sides of the cover plate 33 are adhesively welded to the sides of the first connecting plate 31 and the second connecting plate 32. Chamfers 331 are provided at the four corners of the cover plate 33. By setting the chamfers 331, the cover plate 33 can be better installed on the inner circumference of the column, avoiding interference caused by the four corners of the cover plate 33 during its installation.

[0037] A positioning hole 333 is opened in the middle of the cover plate 33. A first mounting hole 332 is provided on the outer circumference of the positioning hole 333. The positioning hole 333 can be a threaded hole.

[0038] Refer to Figure 3-Figure 6 , the ear plate 322 is fixed to the corresponding connecting extension plate 311. Specifically, the ear plate 322 is welded and fixed to the corresponding connecting extension plate 311, and the upper and lower ends of the connecting extension plate 311 are flush with the corresponding ear plates 322 respectively. The connecting extension plate 311 and its corresponding upper and lower two ear plates 322 cooperate to form a sideways "U" - shaped structure.

[0039] Through the combined method of stamping and welding, it is convenient for the forming of the connecting member 3, improving the production efficiency of the connecting member 3, reducing the production cost, and when the size of the connecting member 3 needs to be modified, the size of the subsequent - made connecting member 3 can be modified by replacing the stamping die. Compared with the traditional casting - formed connecting member 3, the connecting member 3 in this embodiment is more convenient to process and manufacture, has stronger adaptability, and is easier to adjust the size.

[0040] In this application, the thickness of the first connecting plate 31 and the second connecting plate 32 is 4 mm - 5 mm.

[0041] Refer to Figure 3-Figure 6 , a plurality of corner - piece countersunk holes 34 are opened on the connecting extension plate 311 and the ear plate 322. The corner - piece countersunk holes 34 can be used for riveting parts to be fixed, and the corner - piece countersunk holes 34 are inclinedly distributed on the connecting extension plate 311 and the ear plate 322. By the inclined distribution of the corner - piece countersunk holes 34, the number of distributions of the corner - piece countersunk holes 34 is increased, thereby improving the overall structural strength after riveting through the corner - piece countersunk holes 34. The distance between adjacent corner - piece countersunk holes 34 is equal.

[0042] The diameter of the corner - piece countersunk hole 34 is 22 mm - 28 mm; in this embodiment, the diameter of the corner - piece countersunk hole 34 is 25 mm. The depth of the corner - piece countersunk hole 34 is 3.5 mm - 5.5 mm, and in this embodiment, the depth of the corner - piece countersunk hole 34 is 4.5 mm. The countersunk angle of the corner - piece countersunk hole 34 is 130° - 140°.

[0043] Refer to Figure 3-Figure 6 , a transition section 35 which is bent close to the second connecting plate 32 is provided between the first connecting plate 31 and the connecting extension plate 311. By providing the transition section 35, the connecting extension plate 311 is distributed closer to the second connecting plate 32.

[0044] Taking the long beam 11 as an example, the end of the long beam 11 is mounted on the outer side of the ear plate 322 and the connecting extension plate 311, so that the end of the long beam 11 is fitted with the connecting extension plate 311 and the ear plate 322. Specifically, the web of the long beam 11 is fitted with the outer side of the connecting extension plate 311, and the flange of the long beam 11 is fitted with the outer side of the ear plate 322.

[0045] Reference Figure 3-Figure 6 The main beam 1 is provided with a main beam countersunk hole 17 corresponding to the ear plate 322 and the connecting extension plate 311, that is, the main beam countersunk hole 17 on the main beam 1 corresponds to the position of the corner piece countersunk hole 34 on the connecting extension plate 311, and the main beam countersunk hole 17 on the main beam 1 corresponds to the position of the corner piece countersunk hole 34 on the ear plate 322. Then, when the end of the main beam 1 is sleeved on the outside of the ear plate 322 and the connecting extension plate 311, the main beam countersunk hole 17 on the main beam 1 and the corner piece countersunk hole 34 on the connecting extension plate 311 and the ear plate 322 are positioned inside and outside in correspondence, so that the main beam 1 and the connecting piece 3 can be quickly positioned and riveted through the corresponding main beam countersunk hole 17 and the corner piece countersunk hole 34, thereby improving the assembly accuracy of this embodiment during use and ensuring the efficiency and quality of installation.

[0046] The diameter of the main beam countersunk holes 17 is 16mm-24mm; in this embodiment, the diameter is 20mm. The depth of the main beam countersunk holes 17 is 3.5mm-5.5mm, and in this embodiment, the depth is 4.5mm. The main beam countersunk holes 17 in two adjacent rows are staggered; the distance between adjacent main beam countersunk holes 17 is equal. This equal distance improves force uniformity at the connection point under external loads.

[0047] After the connector 3 and the main beam 1 are prefabricated and transported to the site, the countersunk holes 34 of the corner pieces are butted against the countersunk holes 17 of the main beam, and then the connector 3 and the main beam 1 are connected by riveting.

[0048] In the present application, the rivet is a seahorse rivet, and in other embodiments, the rivet may also be a piercing rivet.

[0049] Furthermore, when the main beam countersunk hole 17 on the main beam 1 is positioned corresponding to the corner piece countersunk hole 34 on the connecting extension plate 311 and the ear plate 322, the web end of the main beam 1 abuts against the transition section 35 to improve the efficiency and accuracy of the main beam 1 when assembled with this embodiment.

[0050] Reference Figure 3-Figure 6, and when the main beam countersunk hole 17 on the main beam 1 corresponds to the corner piece countersunk hole 34 on the connecting extension plate 311 and the ear plate 322, the main beam countersunk hole 17 of the main beam 1 and the corner piece countersunk hole 34 of the connecting piece 3 abut against each other to increase the abutment area between the connecting piece 3 and the main beam 1. Then, when the main beam 1 and the connecting piece 3 are fixed by riveted parts, the main beam countersunk hole 17 and the corner piece countersunk hole 34 are arranged in abutment with each other, which can improve the assembly structural strength of the main beam 1 riveted to the connecting piece 3.

[0051] Reference Figure 1 、 Figure 2 、 Figure 7 and Figure 8 The main beam 1 includes a main web 13, a main upper flange 14, and a main lower flange 15. The main upper flange 14 is fixedly connected to the upper end of the main web 13, and the main lower flange 15 is fixedly connected to the lower end of the main web 13. The main upper flange 14 is vertically bent downward on the side facing the secondary beam 2 to form a main upper bent plate 141. The main lower flange 15 is vertically bent upward on the side facing the secondary beam 2 to form a main lower bent plate 151. The main upper bent plate 141 and the main lower bent plate 151 are provided to connect the main beam 1 and the secondary beam 2 into a whole, thereby achieving more efficient structural connection and functional integration. In addition, a plurality of second mounting holes 16 are equidistantly provided on the main upper flange 14 and the main lower flange 15. The provision of the second mounting holes 16 can facilitate the connection of the main beam 1 to the vertical structure and ensure that the main beam 1 is accurately fixed in the required position.

[0052] Reference Figure 1 、 Figure 2 、 Figure 7 and Figure 8 Furthermore, a number of countersunk protrusions 132 are pressed on the main web 13. The countersunk protrusions 132 are waist-shaped, and the upper and lower ends of the countersunk protrusions 132 are arc-shaped. The countersunk depth of the countersunk protrusions 132 is 3.5mm-5.5mm. The arc-shaped design can better disperse stress, reduce stress concentration in the connection part, and reduce the risk of damage to the connection parts due to stress concentration, thereby improving the strength and stability of the connection. The setting of the countersunk protrusions 132 increases the thickness of the main web 13 in disguise, thereby improving the connection strength of the main web 13. Since the countersunk protrusions 132 are directly punched out by a punch press in the factory, there is no need for staff to add stiffening ribs on site, and the requirements of the connection strength can be met, thereby improving assembly efficiency. There is no need for staff to add stiffening ribs on site, and the requirements of the connection strength can be met, thereby improving assembly efficiency.

[0053] Reference Figure 1 、 Figure 2 、 Figure 7 and Figure 8The secondary beam 2 includes a secondary web 23, a secondary upper flange plate 24 and a secondary lower flange plate 25. The secondary upper flange plate 24 is fixedly connected to the upper end of the secondary web 23, and the secondary lower flange plate 25 is fixedly connected to the lower end of the secondary web 23.

[0054] Reference Figure 1 、 Figure 2 、 Figure 7 and Figure 8 The secondary beam 2 is a C-shaped groove. The end of the secondary upper flange plate 24 facing the main beam 1 is bent vertically downward to form a secondary upper bent plate 241. The end of the secondary lower flange plate 25 facing the main beam 1 is bent vertically upward to form a secondary upper bent plate 241. The bending length of the secondary upper bent plate 241 and the secondary lower bent plate 251 is 30 mm. The bending length of the primary upper bent plate 141 is the same as that of the secondary upper bent plate 241. The bending length of the primary lower bent plate 151 is the same as that of the secondary lower bent plate 251. The end of the secondary web plate 23 is bent to form a secondary web bent plate 231. The secondary web bent plate 231 corresponds to the countersunk protrusion 132 and is connected by rivets.

[0055] The secondary upper bending plate 241 and the primary upper bending plate 141 are riveted together by rivets.

[0056] The secondary lower bent plate 251 and the primary lower bent plate 151 are riveted together by rivets.

[0057] The main beam 1 and the secondary beam 2 are riveted together using a cold treatment method, which avoids the risk of igniting flammable materials during welding, and the rivet connection has better ductility when subjected to impact or vibration; the riveting of the main beam 1 and the secondary beam 2 can be carried out in large-scale batch production, greatly improving the efficiency of the processing process.

[0058] Reference Figure 1 、 Figure 2 、 Figure 7 and Figure 8 The riveted parts between the secondary beam 2 and the main beam 1 are piercing rivets. Driven by the hydraulic piercing rivet punch, the piercing rivets pierce the secondary upper bent plate 241 and the secondary lower bent plate 251 respectively. At the same time, the piercing rivets drive the primary upper bent plate 141 and the primary lower bent plate 151 to plastically deform and enter the piercing riveting die. Under the action of the punch and boss in the hydraulic piercing rivet punch, the legs of the piercing rivets expand to both sides and embed into the primary upper bent plate 141 and the primary lower bent plate 151 respectively, thereby tightly connecting the primary upper bent plate 141 and the secondary upper bent plate 241, and the primary lower bent plate 151 and the secondary lower bent plate 251. The secondary upper bent plate 241 is riveted to the primary upper bent plate 141, and the secondary lower bent plate 251 is riveted to the primary lower bent plate 151. This connection method can make the secondary beam 2 have a torsion-resistant effect. It can also prevent the countersunk protrusion 132 and the secondary web bent plate 231 from being loosened after being connected to the main beam 1 and the secondary beam 2, making the connection between the main beam 1 and the secondary beam 2 more secure.

[0059] During the riveting process between the secondary web bent plate 231 and the countersunk protrusion 132, the piercing rivet is pre-pressed toward the main web 13 under the drive of the hydraulic piercing rivet punch; the hydraulic piercing rivet punch can push the piercing rivet during the movement, forcing it to pierce the countersunk protrusion 132, and at the same time, the piercing rivet can cause the secondary web bent plate 231 to undergo plastic deformation and enter the piercing riveting die.

[0060] Reference Figure 1 、 Figure 2 、 Figure 7 and Figure 8 As the riveting progresses, the secondary web bent plate 231 gradually fills the piercing riveting die due to plastic deformation. The piercing riveting die has a punch and a boss. Under the action of the punch and the boss, the legs of the piercing rivet expand to both sides and embed into the secondary web bent plate 231, thereby making the piercing rivet tightly connected to the countersunk protrusion 132 and the secondary web bent plate 231. The secondary web bent plate 231 is riveted on the countersunk protrusion 132, which makes the connection between the main beam 1 and the secondary beam 2 tighter and more secure, and can withstand greater pressure. The countersunk protrusion 132 is pressed and formed by a machine tool, thus presenting a structure that protrudes toward the secondary beam 2 and is recessed in the direction of the secondary beam 2. This method can increase the thickness of the connection point of the main beam 1, thereby increasing the connection strength. This not only makes the connection between the main beam 1 and the secondary beam 2 tighter. In addition, a plurality of rivet holes 131 are provided between the countersunk protrusion 132 and the secondary web bent plate 231, and in this embodiment, there are three rivet holes 131. A plurality of rivet holes 131 with equal distances can better disperse and withstand external forces, thereby improving the stability and safety of the connection between the main beam 1 and the secondary beam 2, and higher strength steel can be used to adapt to the structural system.

[0061] The ends of the secondary webs 23 are isosceles trapezoidal in shape. This connection prevents the secondary beam 2 from contacting the connection between the primary webs 13 and the primary upper flanges 14 or lower flanges, reducing stress concentration and thereby improving the stability and load-bearing capacity of the entire structure.

[0062] The spacing between adjacent secondary beams 2 is 350mm-450mm. The connecting grooves 21 of the secondary beams 2 have a curled edge 28. The connecting beams 22 are channel steel, with the upper and lower flanges of the connecting beams 22 fixedly connected to the curled edge 28. The connecting grooves 21 are waist-shaped holes with a length of 80mm-120mm. The connecting beams 22 are made of C150 maraging steel.

[0063] The webs at both ends of the connecting beam 22 are extended and bent to form first bent plates 222 , and the first bent plates 222 are connected to the countersunk protrusions 13 on the main beam 1 by rivets.

[0064] The secondary beam 2 is made of C200 or C200 maraging steel, and its specification is C-shaped steel.

[0065] Reference Figure 1 、 Figure 2 、 Figure 7 and Figure 8 To enhance the strength of the connection between the long beam 11 and the short beam 12, a reinforcement beam 27 is fixed at the junction. The secondary beam 2 also has an opening 26, through which the reinforcement beam 27 passes and is connected to the long beam 11 and the short beam 12 at both ends. To reduce the need for additional equipment for the secondary beam 2, the size and specifications of the opening 26 and the connecting slot 21 are designed to be identical. This allows a single piece of equipment to create both the opening 26 and the connecting slot 21 on the secondary beam 2.

[0066] The reinforcing beam 27 is an L-shaped steel. The two ends of the web of the reinforcing beam 27 are further provided with second bent plates 271 . The second bent plates 271 are fixedly connected to the countersunk protrusions 132 on the long beam 11 and the short beam 12 respectively.

[0067] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application; therefore, based on the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural methods and implementation methods. Therefore, the above specific implementation methods and drawings are only illustrative of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or restriction on the technical solution of the present invention. Therefore: All equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An assembled structure of a prefabricated steel building, characterized by: It includes a long beam, a short beam, and connecting parts connected to the long beam and the short beam respectively. The long beam and the short beam together form a rectangular frame. Multiple secondary beams are connected in the rectangular frame. The two ends of the secondary beams are connected to the long beam through rivets. The rivets are seahorse rivets and / or piercing rivets.

2. The assembly structure of a prefabricated steel building according to claim 1, characterized in that: There are multiple secondary beams, and adjacent secondary beams are connected by connecting beams.

3. The assembly structure of a prefabricated steel building according to claim 2, characterized in that: The secondary beams are further provided with connecting grooves, and the connecting beams pass through the connecting grooves of the secondary beams and are riveted to the short beams at both ends.

4. The assembly structure of a prefabricated steel building according to claim 3, characterized in that: The connecting groove has a curling edge, the connecting beam is a channel steel, and the upper flange and the lower flange of the connecting beam are fixedly connected with the curling edge.

5. The assembly structure of a prefabricated steel building according to claim 4, characterized in that: The connecting groove is a waist-shaped hole, and the length of the waist-shaped hole is 80mm-120mm.

6. The assembly structure of a prefabricated steel building according to claim 2, characterized in that: The web of the connecting beam is extended and has a first bent portion, and the first bent portion is riveted to the short beam.

7. The assembly structure of a prefabricated steel building according to claim 2, characterized in that: The connecting beam is made of C150 maraging steel.

8. The assembly structure of a prefabricated steel building according to claim 2, characterized in that: The spacing between adjacent secondary beams is 350mm-450mm.

9. The assembly structure of a prefabricated steel building according to claim 1, characterized in that: The long beam, short beam and secondary beam are made of C200, C250 or C300 maraging steel.

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