Fabricated rectangular steel tube frame structure system with pitched roof

Abstract

The invention provides a fabricated rectangular steel tube frame structure system with a pitched roof. The fabricated rectangular steel tube frame structure system with the pitched roof comprises a frame structure and the pitched roof arranged on the frame structure. The frame structure comprises a plurality of first enclosure frames which are sequentially connected in the X direction, a plurality of groups of first enclosure frames are arranged in the Y direction at intervals, and every two groups of first enclosure frames are connected through a second cross beam; the first enclosure frame comprises at least two stand columns arranged at intervals and a plurality of first cross beams connected between the at least two stand columns, the first cross beams are arranged on the stand columns, and the first cross beams and the second cross beams are aligned one by one in the height direction; the pitched roof comprises at least two frame assemblies symmetrically arranged in the X direction and a third cross beam connected between the at least two frame assemblies. Materials are reasonably utilized, roof space utilization is facilitated, assembly type installation is adopted, labor is saved, the construction period is shortened, and the engineering cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and particularly to a prefabricated rectangular steel pipe frame structure system with a sloping roof. Background Art

[0002] In existing frame structures, the cross-sections of beam and column members are usually designed with constant cross-sections within the same span on the same floor. However, since the internal forces of beam and column members usually change continuously along the length of the members (as Figure 1 shown), and the selection of the cross-sectional dimensions of the members is usually determined by the maximum internal forces of the members, the material strength of the members is not fully utilized during the design process, indirectly increasing the project cost.

[0003] Existing steel frame structures usually adopt the method of fabricating members in factories and assembling them on site. After forming the structural frame, the installation of wall panels, floor panels, and roof panels is carried out. The work efficiency is relatively low and the construction period is long, resulting in an increase in project cost.

[0004] In addition, for the professional terms involved in this case, the following are generally recognized in the art:

[0005] A frame structure refers to a frame structure formed by using rectangular steel pipes as the cross-sections of the main load-bearing members;

[0006] A sloping roof refers to the roof structure of a frame structure, which is a spatial structure with a slope on the upper part formed by combining different planar rectangular steel pipe roof truss structures, and jointly constitutes the roof structure of the frame structure with roof purlins and roof panels;

[0007] Prefabrication means unitizing the enhanced rectangular steel pipe frame structure, dividing the structure into multiple spatial units or planar units, and each unit contains corresponding components such as beams, columns, walls, floor slabs, and roof trusses. After being built in the factory and transported to the construction site, the whole frame structure system is formed by integral hoisting or piecemeal hoisting and assembly;

[0008] An enhanced rectangular steel pipe refers to a steel pipe with a wall thickness larger than that of a common rectangular steel pipe, or a rectangular steel pipe with a slightly smaller cross-sectional dimension is added inside the common rectangle, and a double-layer rectangular steel pipe is formed through welded joints. Summary of the Invention

[0009] The purpose of the present invention is to provide a prefabricated rectangular steel pipe frame structure system with a sloping roof. The prefabricated construction method of the sheet type or box type can improve work efficiency, save labor, shorten the construction period, and reduce the project cost.

[0010] The technical solution of the present invention is: a prefabricated rectangular steel pipe frame structure system with a pitched roof, including a frame structure and a pitched roof provided on the frame structure; the frame structure includes a plurality of first enclosures connected in sequence in the X direction or the Y direction, and a plurality of groups of the first enclosures are spaced apart in the Y direction or the X direction, and two adjacent groups of the first enclosures are connected by a second cross beam; the first enclosure includes at least two spaced columns and a first cross beam connected between at least two of the columns, at least one first cross beam is provided on the columns, and the first cross beam and the second cross beam are aligned in the height direction.

[0011] The pitched roof includes at least two frame components symmetrically arranged in the X direction or the Y direction and a third cross beam connected between at least two frame components; the X direction and the Y direction are perpendicular to each other on the same top view projection plane.

[0012] Preferably, two adjacent first enclosures share a column.

[0013] Preferably, the first enclosure includes a plurality of first rectangular pipes, a plurality of second rectangular pipes, a plurality of third rectangular pipes and a plurality of fourth rectangular pipes, the wall thickness of the first rectangular pipe is greater than the wall thickness of the second rectangular pipe, or the first rectangular pipe is a double-layer pipe and the second rectangular pipe is a single-layer pipe; the first rectangular pipe and the third rectangular pipe have the same structure, and the second rectangular pipe and the fourth rectangular pipe have the same structure.

[0014] The columns are formed by connecting the first rectangular pipes and the second rectangular pipes in an alternating manner in sequence; the first cross beam is formed by connecting the third rectangular pipes and the fourth rectangular pipes in an alternating manner in sequence.

[0015] Preferably, the sum of the third rectangular pipes and the fourth rectangular pipes on the first cross beam is an odd number, and the number of the third rectangular pipes is greater than the number of the fourth rectangular pipes; the sum of the first rectangular pipes and the second rectangular pipes on the column is an odd number, and the number of the first rectangular pipes is greater than the number of the second rectangular pipes.

[0016] Preferably, the frame component includes a second enclosure, a third enclosure provided on the side of the second enclosure in the X direction, a fourth enclosure connected between the second enclosure and the third enclosure, and a fifth enclosure extending along the X direction from the third enclosure; the second enclosures on two adjacent frame components are arranged close to each other.

[0017] Preferably, one end of the fourth enclosure is connected to the middle of the second enclosure, and the other end of the fourth enclosure extends to the corner of the frame structure; the fourth enclosure is provided at both ends of the third enclosure; one end of the fifth enclosure away from the third enclosure extends to the edge of the frame structure.

[0018] Preferably, the second surrounding frame includes first diagonal bars, first horizontal bars, and first vertical bars. The first diagonal bars are connected to both ends of the first horizontal bar and form a triangle with the first horizontal bar. A plurality of the first vertical bars are connected to the middle and both ends of the triangle. The first horizontal bar is connected to the upper end of the frame structure, and one end of the fourth surrounding frame is connected to the first vertical bar in the middle of the triangle.

[0019] Preferably, the third surrounding frame includes a second horizontal bar, second diagonal bars, a third horizontal bar, and second vertical bars. The third horizontal bar is connected to the upper end of the frame structure. The second horizontal bar is located above the third horizontal bar. The second vertical bar is connected between the middle of the second horizontal bar and the middle of the third horizontal bar. The second diagonal bars are connected between the end of the second horizontal bar and the middle of the third horizontal bar. Both ends of the second horizontal bar and the third horizontal bar are respectively connected to the fourth surrounding frame, and one end of the fifth surrounding frame is connected to the second vertical bar.

[0020] Preferably, the fourth surrounding frame includes third diagonal bars, third vertical bars, and a fourth horizontal bar. The fourth horizontal bar is connected to the upper end of the frame structure. One end of the third diagonal bar is connected to one end of the fourth horizontal bar, and the obliquely arranged other end of the third diagonal bar and the other end of the fourth horizontal bar are connected to the second surrounding frame. The third vertical bar is connected between the third diagonal bar and the fourth horizontal bar.

[0021] Preferably, the fifth surrounding frame includes fourth diagonal bars and a fifth horizontal bar. One end of the fourth diagonal bar is connected to one end of the fifth horizontal bar, and the obliquely arranged other end of the fourth diagonal bar and the other end of the fifth horizontal bar are connected to the third surrounding frame.

[0022] Compared with the related art, the beneficial effects of the present invention are as follows:

[0023] First, the present invention adopts a sheet-type or box-type prefabricated construction method, which can improve work efficiency, save labor, shorten the construction period, and reduce project costs.

[0024] Second, according to the uneven distribution characteristics of the internal forces of the beam-column members of the frame structure, the present invention respectively adopts enhanced rectangular steel pipe sections (thicker wall thickness or double-layer pipes) and ordinary rectangular steel pipe sections, and combines them in segments to form new rectangular steel pipe steel beams and steel columns, which have good applicability to low-rise and multi-story steel frame structures. Such enhanced rectangular steel pipe steel beams and enhanced rectangular steel pipe steel columns can make the external dimensions of the members consistent, and the appearance of the members is smooth and beautiful. The connection parts between different rectangular steel pipe sections are located at relatively small stress parts of the members, and the force transmission is safe and reliable. The sections with thicker wall thickness or rectangular steel pipe sections wrapped outside are adopted in the sections with larger internal forces, and ordinary rectangular steel pipe sections are adopted in the sections with smaller internal forces, which can make full use of the mechanical properties of the section materials of the members and reduce project costs.

[0025] III. The roof structure adopts a vertical rod connection method, which is convenient for forming a use passage and facilitating the utilization of the roof space and the use requirements of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the bending moment distribution of the frame structure;

[0027] Figure 2 It is a schematic diagram of the structure of the prefabricated rectangular steel pipe frame structure system with a sloping roof provided by the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the first surrounding frame of the first embodiment in the prefabricated rectangular steel pipe frame structure system with a sloping roof provided by the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the first surrounding frame of the second embodiment in the prefabricated rectangular steel pipe frame structure system with a sloping roof provided by the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the sloping roof;

[0031] Figure 6 It is for Figure 5 the schematic diagram of the structure of the second surrounding frame in;

[0032] Figure 7 It is for Figure 5 the schematic diagram of the structure of the third surrounding frame in;

[0033] Figure 8 It is for Figure 5 the schematic diagram of the structure of the fourth surrounding frame in;

[0034] Figure 9 It is for Figure 5 the schematic diagram of the structure of the fifth surrounding frame in.

[0035] In the attached drawings: 1. Frame structure; 11. First surrounding frame; 111. Column; 1111. First section; 1112. Second section; 1113. Third section; 1114. Fourth section; 1115. Fifth section; 112. First cross beam; 1121. Sixth section; 1122. Seventh section; 1123. Eighth section; 113. First rectangular pipe; 114. Second rectangular pipe; 115. Third rectangular pipe; 116. Fourth rectangular pipe; 12. Second cross beam; 2. Sloping roof; 21. Frame assembly; 211. Second surrounding frame; 2111. First inclined bar; 2112. First horizontal bar; 2113. First vertical bar; 212. Third surrounding frame; 2121. Second horizontal bar; 2122. Second inclined bar; 2123. Third horizontal bar; 2124. Second vertical bar; 213. Fourth surrounding frame; 2131. Third inclined bar; 2132. Third vertical bar; 2133. Fourth horizontal bar; 214. Fifth surrounding frame; 2141. Fourth inclined bar; 2142. Fifth horizontal bar; 22. Third cross beam. Detailed implementation mode

[0036] The present invention will be described in detail below with reference to the attached drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. For the convenience of narration, words such as "upper", "lower", "left", and "right" in the following text only indicate the same direction as the upper, lower, left, and right directions of the attached drawings themselves, and do not limit the structure.

[0037] As Figure 2 shown, a prefabricated rectangular steel pipe frame structure system with a sloping roof provided in this embodiment includes a frame structure 1 and a sloping roof 2 provided on the frame structure 1.

[0038] The frame structure 1 includes a plurality of first surrounding frames 11 connected in sequence in the X direction or the Y direction. A plurality of groups of the first surrounding frames 11 are arranged at intervals in the Y direction or the X direction, and each two groups of the first surrounding frames 11 are connected by a second cross beam 12.

[0039] As Figure 3 、 Figure 4 shown, the first surrounding frame 11 includes at least two columns 111 arranged at intervals and a first cross beam 112 connected between at least two columns 111. A plurality of first cross beams 112 are arranged on the columns 111, and the plurality of first cross beams 112 are respectively connected to the upper ends and the waists of the columns 111. The first cross beam 112 and the second cross beam 12 are aligned one by one in the height direction. Two adjacent first surrounding frames 11 share a column 111.

[0040] As Figure 2As shown, in the first embodiment, the first surrounding frame 11 is a single-layer and single-span structure, which includes two columns 111 arranged at intervals and a first cross beam 112 connected between the two columns 111.

[0041] The first surrounding frame 11 includes a plurality of first rectangular tubes 113, a plurality of second rectangular tubes 114, a plurality of third rectangular tubes 115, and a plurality of fourth rectangular tubes (116). The wall thickness of the first rectangular tube 113 is greater than the wall thickness of the second rectangular tube 114, or the first rectangular tube 113 is a double-layer tube and the second rectangular tube 114 is a single-layer tube. The first rectangular tube 113 and the third rectangular tube 115 have the same structure, and the second rectangular tube 114 and the fourth rectangular tube 116 have the same structure. That is, the first rectangular tube 113 and the third rectangular tube 115 form enhanced steel tubes by increasing the wall thickness and the number of layers, and the second rectangular tube 114 and the fourth rectangular tube 116 are ordinary steel tubes. The first rectangular tube 113 is arranged at the starting and ending positions of the column 111, and the second rectangular tube 114 is connected between two adjacent first rectangular tubes 113. The third rectangular tube 115 is arranged at the starting and ending positions of the first cross beam 112, and the fourth rectangular tube 116 is connected between two adjacent third rectangular tubes 115.

[0042] The sum of the third rectangular tubes 115 and the fourth rectangular tubes 116 on the first cross beam 112 is an odd number, and the number of the third rectangular tubes 115 is greater than the number of the fourth rectangular tubes 116. The sum of the first rectangular tubes 113 and the second rectangular tubes 114 on the column 111 is an odd number, and the number of the first rectangular tubes 113 is greater than the number of the second rectangular tubes 114. As Figure 2 shown, in a single layer, the sum of the number of the first rectangular tubes 113 and the second rectangular tubes 114 of the column 111 is three, and the sum of the number of the third rectangular tubes 115 and the fourth rectangular tubes 116 on the first cross beam 112 is three. As Figure 3 shown, in a double layer, the sum of the number of the first rectangular tubes 113 and the second rectangular tubes 114 on the column 111 is five, and the sum of the number of the third rectangular tubes 115 and the fourth rectangular tubes 116 on the first cross beam 112 is five. And so on, it can be applied to multi-story buildings.

[0043] In the second embodiment, as Figure 4 shown, the column 111 is a rectangular steel tube, which includes a first section 1111, a second section 1112, a third section 1113, a fourth section 1114, and a fifth section 1115 that are connected in sequence by welding from top to bottom.

[0044] The wall thicknesses of the first section 1111, the third section 1113, and the fifth section 1115 are greater than the wall thickness of the second section 1112, and the wall thickness of the second section 1112 is equal to the wall thickness of the fourth section 1114.

[0045] Alternatively, the first section 1111, the third section 1113, and the fifth section 1115 are double-layer pipes with a lining, and the wall thickness of the second section 1112 and the fourth section 1114 are single-layer pipes. The first cross beam 112 includes a sixth section 1121, a seventh section 1122, and an eighth section 1123 that are sequentially connected by welding. Among multiple first cross beams 112, the sixth section 1121 of one of the first cross beams 112 is connected to the first section 1111 of one of the columns 111, and the eighth section 1123 of this first cross beam 112 is connected to the first section 1111 of another column 111. The sixth section 1121 of another first cross beam 112 is connected to the third section 1113 of one of the columns 111, and the eighth section 1123 of this first cross beam 112 is connected to the third section 1113 of another column 111, and so on, connecting multiple first cross beams 112 to the columns 111. The fifth section 1115 is fixed to the ground.

[0046] The wall thickness of the sixth section 1121 and the eighth section 1123 is greater than the wall thickness of the seventh section 1122; alternatively, the sixth section 1121 and the eighth section 1123 are double-layer pipes with a lining, and the double-layer pipes are connected as a whole by welding and jointly bear force. The seventh section 1122 is a single-layer pipe.

[0047] The first section 1111, the third section 1113, the fifth section 1115, the sixth section 1121, and the eighth section 1123 are enhanced rectangular steel pipe sections, and the rest are ordinary rectangular steel pipe sections. Among them, the first section 1111, the third section 1113, and the fifth section 1115 are the first rectangular pipes 113. The sixth section 1121 and the eighth section 1123 are the third rectangular pipes 115. The second section 1112 and the fourth section 1114 are the second rectangular pipes 114. The seventh section 1122 is the fourth rectangular pipe 116.

[0048] As Figure 5 shown, the pitched roof 2 includes at least two frame components 21 symmetrically arranged in the X direction or the Y direction and a third cross beam 22 connected between the at least two frame components 21. The X direction and the Y direction are perpendicular to each other on the same top view projection plane. One end of the fourth surrounding frame 213 is connected to the middle of the second surrounding frame 211, and the other end of the fourth surrounding frame 213 extends to the corner of the frame structure 1. The fourth surrounding frame 213 is provided at both ends of the third surrounding frame 212; one end of the fifth surrounding frame 214 away from the third surrounding frame 212 extends to the edge of the frame structure 1.

[0049] As Figure 6As shown in the figure, the second surrounding frame 211 includes a first diagonal bar 2111, a first horizontal bar 2112, and a first vertical bar 2113. The first diagonal bar 2111 is connected to both ends of the first horizontal bar 2112 and forms a triangle with the first horizontal bar 2112. A plurality of first vertical bars 2113 are connected to the middle and both ends of the triangle. The first horizontal bar 2112 is connected to the upper end of the frame structure 1. One end of the fourth surrounding frame 213 is connected to the first vertical bar 2113 in the middle of the triangle.

[0050] As Figure 7 shown in the figure, the third surrounding frame 212 includes a second horizontal bar 2121, a second diagonal bar 2122, a third horizontal bar 2123, and a second vertical bar 2124. The third horizontal bar 2123 is connected to the upper end of the frame structure 1. The second horizontal bar 2121 is located above the third horizontal bar 2123. The second vertical bar 2124 is connected between the middle of the second horizontal bar 2121 and the middle of the third horizontal bar 2123. The second diagonal bar 2122 is connected between the end of the second horizontal bar 2121 and the middle of the third horizontal bar 2123. Both ends of the second horizontal bar 2121 and the third horizontal bar 2123 are respectively connected to the third vertical bar 2132 of the fourth surrounding frame 213. One end of the fifth surrounding frame 214 is connected to the second vertical bar 2124.

[0051] As Figure 8 shown in the figure, the fourth surrounding frame 213 includes a third diagonal bar 2131, a third vertical bar 2132, and a fourth horizontal bar 2133. The fourth horizontal bar 2133 is connected to the upper end of the frame structure 1. One end of the third diagonal bar 2131 is connected to one end of the fourth horizontal bar 2133. The other end of the third diagonal bar 2131, which is inclined, and the other end of the fourth horizontal bar 2133 are connected to the first vertical bar 2113 in the middle of the second surrounding frame 211. The third vertical bar 2132 is connected between the third diagonal bar 2131 and the fourth horizontal bar 2133.

[0052] As Figure 9 shown in the figure, the fifth surrounding frame 214 includes a fourth diagonal bar 2141 and a fifth horizontal bar 2142. One end of the fourth diagonal bar 2141 is connected to one end of the fifth horizontal bar 2142. The other end of the fourth diagonal bar 2141, which is inclined, and the other end of the fifth horizontal bar 2142 are connected to the third surrounding frame 212.

[0053] Weld connections are used between the above-mentioned bars.

[0054] The structural system prefabricated installation methods can be divided into two categories: panel prefabricated installation method and box prefabricated installation method.

[0055] The sheet-type prefabricated installation method includes two parts: the lower enhanced rectangular steel pipe frame structure and the upper pitched roof structure. The lower enhanced rectangular steel pipe frame structure takes each wall surface and each floor slab of each floor as an assembly unit. First, it is fabricated into sheet-type components in the factory. After being transported to the site, it is hoisted and assembled in sequence to form the lower frame structure. The upper pitched roof structure is fabricated in the factory according to each composed rectangular steel pipe rigid frame. After being transported to the site, it is hoisted and assembled in sequence to form the upper roof structure.

[0056] The cassette-type prefabricated installation method only applies to the lower enhanced rectangular steel pipe frame structure. Each floor of the lower enhanced rectangular steel pipe frame structure is divided into multiple cassette units according to the bay or room. First, the beams, columns, wall panels, floor slabs, etc. of each cassette unit are fabricated in the factory. After forming the unit as a whole, it is transported to the site and hoisted and assembled according to the cassette unit to form the lower frame structure. The upper roof structure is fabricated, transported, and installed according to the sheet-type prefabricated installation method.

[0057] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An assembled rectangular steel pipe frame structure system with a pitched roof, characterized in that, It includes a frame structure (1) and a pitched roof (2) provided on the frame structure (1); the frame structure (1) includes a plurality of first enclosures (11) connected in sequence in the X direction or the Y direction, and multiple groups of the first enclosures (11) are spaced apart in the Y direction or the X direction, and two adjacent groups of the first enclosures (11) are connected by a second cross beam (12); the first enclosure (11) includes at least two spaced columns (111) and a first cross beam (112) connected between at least two of the columns (111), at least one first cross beam (112) is provided on the columns (111), and the first cross beam (112) and the second cross beam (12) are aligned in the height direction one by one. The pitched roof (2) includes at least two frame components (21) symmetrically arranged in the X direction or the Y direction and a third cross beam (22) connected between at least two frame components (21); the X direction and the Y direction are perpendicular to each other on the same top view projection plane.

2. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 1, characterized in that, Two adjacent first enclosures (11) share a column (111).

3. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 1, characterized in that, The first enclosure (11) includes a plurality of first rectangular tubes (113), a plurality of second rectangular tubes (114), a plurality of third rectangular tubes (115), and a plurality of fourth rectangular tubes (116), the wall thickness of the first rectangular tube (113) is greater than the wall thickness of the second rectangular tube (114), or the first rectangular tube (113) is a double-layer tube and the second rectangular tube (114) is a single-layer tube; the first rectangular tube (113) and the third rectangular tube (115) have the same structure, and the second rectangular tube (114) and the fourth rectangular tube (116) have the same structure. The columns (111) are formed in a sequentially staggered connection manner where one first rectangular tube (113) is connected to one second rectangular tube (114); the first cross beam (112) is formed in a sequentially staggered connection manner where one third rectangular tube (115) is connected to one fourth rectangular tube (116).

4. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 3, wherein The sum of the third rectangular tubes (115) and the fourth rectangular tubes (116) on the first cross beam (112) is an odd number, and the number of the third rectangular tubes (115) is greater than the number of the fourth rectangular tubes (116); the sum of the first rectangular tubes (113) and the second rectangular tubes (114) on the columns (111) is an odd number, and the number of the first rectangular tubes (113) is greater than the number of the second rectangular tubes (114).

5. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 1, characterized in that, The frame component (21) includes a second enclosure (211), a third enclosure (212) provided on the X-direction side of the second enclosure (211), a fourth enclosure (213) connected between the second enclosure (211) and the third enclosure (212), and a fifth enclosure (214) extending along the X direction from the third enclosure (212); the second enclosures (211) on two adjacent frame components (21) are arranged close to each other.

6. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 5, characterized in that, One end of the fourth surrounding frame (213) is connected to the middle of the second surrounding frame (211), and the other end of the fourth surrounding frame (213) extends to the corner of the frame structure (1); the fourth surrounding frame (213) is provided at both ends of the third surrounding frame (212); one end of the fifth surrounding frame (214) away from the third surrounding frame (212) extends to the edge of the frame structure (1).

7. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 5, characterized in that The second surrounding frame (211) includes a first diagonal rod (2111), a first horizontal rod (2112) and a first vertical rod (2113). The first diagonal rod (2111) is connected to both ends of the first horizontal rod (2112) and forms a triangle with the first horizontal rod (2112). A plurality of the first vertical rods (2113) are connected in the middle and at both ends of the triangle. The first horizontal rod (2112) is connected to the upper end of the frame structure (1), and one end of the fourth surrounding frame (213) is connected to the first vertical rod (2113) in the middle of the triangle.

8. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 5, characterized in that The third surrounding frame (212) includes a second horizontal rod (2121), a second diagonal rod (2122), a third horizontal rod (2123) and a second vertical rod (2124). The third horizontal rod (2123) is connected to the upper end of the frame structure (1). The second horizontal rod (2121) is located above the third horizontal rod (2123). The second vertical rod (2124) is connected between the middle of the second horizontal rod (2121) and the middle of the third horizontal rod (2123). The second diagonal rod (2122) is connected between the end of the second horizontal rod (2121) and the middle of the third horizontal rod (2123). Both ends of the second horizontal rod (2121) and the third horizontal rod (2123) are respectively connected to the fourth surrounding frame (213), and one end of the fifth surrounding frame (214) is connected to the second vertical rod (2124).

9. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 5, characterized in that, The fourth surrounding frame (213) includes a third diagonal rod (2131), a third vertical rod (2132) and a fourth horizontal rod (2133). The fourth horizontal rod (2133) is connected to the upper end of the frame structure (1). One end of the third diagonal rod (2131) is connected to one end of the fourth horizontal rod (2133). The other end of the third diagonal rod (2131) which is inclined is connected to the other end of the fourth horizontal rod (2133) on the second surrounding frame (211). The third vertical rod (2132) is connected between the third diagonal rod (2131) and the fourth horizontal rod (2133).

10. The prefabricated rectangular steel pipe frame structure system with a pitched roof according to claim 5, characterized in that, The fifth surrounding frame (214) includes a fourth diagonal rod (2141) and a fifth horizontal rod (2142). One end of the fourth diagonal rod (2141) is connected to one end of the fifth horizontal rod (2142). The other end of the fourth diagonal rod (2141) which is inclined is connected to the other end of the fifth horizontal rod (2142) to the third surrounding frame (212).

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