Method for constructing a prefabricated steel structure using a steel frame fixing structure

Abstract

The application discloses a steel frame fixing structure and a method for constructing and assembling a steel structure, wherein a fixing member is fixed to the outer side of the height of a rectangular steel frame of each hollow rectangular steel stand at the upper lengthening part of each lengthening part hollow rectangular steel stand, a jack is fixed to the outer side of the height of a rectangular steel frame of each hollow rectangular steel stand at the vertical adjacent periphery below the lower lengthening part rectangular steel frame, a tension rod is fixed to the outer side of the height of a lengthening part rectangular steel frame of each lengthening part hollow rectangular steel stand at the periphery between the height of the fixing member and the height of the jack, the outer end of the tension rod is rotationally matched with a pulley, one end of a steel wire rope is fixed to the fixing member, the other end of the steel wire rope is fixed to the free end of a piston rod of the jack after winding around the pulley, and the steel wire rope is pulled tightly by the jack. The structure and method are relatively simple in structure, convenient in operation, do not occupy the internal space of the steel frame, and are relatively good in fixing effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure of fabricated building, in particular to a method for constructing fabricated steel structure by using steel frame fixed structure. BACKGROUND

[0002] The fabricated building with steel structure is gradually accepted by people. For example, a steel structure of a fabricated residential building or a fabricated steel structure in the prior art has a height of tens of layers. Hollow steel columns such as rectangular steel pipe columns with a height of about two or three floors are sequentially assembled upward through connecting blocks and a plurality of screws. The hollow steel columns are connected and fixed by a plurality of X-direction and Y-direction horizontal steel beams to form a steel frame structure of two or three layers of horizontal steel frames. Then, the construction of pouring floor reinforced concrete such as formwork, steel reinforcement cage and concrete pouring, and the construction of pouring concrete into the hollow steel columns are carried out. When the floor concrete and the concrete in the hollow steel columns reach the predetermined strength, the construction of two or three layers of assembly and pouring concrete upward is continued.

[0003] The construction or assembly construction of the steel structure of the fabricated residential building has solved the following technical problems in the prior art: the firmness of the reinforced concrete foundation, the verticality of the plurality of hollow steel columns with the same height at the bottom, the integrity and firmness of the two or three layers of bottom steel frames formed by the plurality of X-direction and Y-direction horizontal steel beams and the hollow steel columns, and the verticality and firmness of the two or three layers of bottom steel frames after pouring the two or three layers of floor reinforced concrete.

[0004] However, from the top of the plurality of hollow steel columns with the same height at the bottom to the assembled layers upward, the bolts and nuts of the two or three layers of lengthened steel frames formed by the plurality of lengthened hollow steel columns with the same height and the plurality of X-direction and Y-direction lengthened horizontal steel beams are finally screwed and supplemented by welding, especially during the construction of pouring the two or three layers of lengthened floor reinforced concrete and the concrete in the lengthened hollow steel columns. The hollow steel columns are easily subjected to impact and extrusion, such as impact and extrusion during pouring of the lengthened floor concrete. In addition, the hollow steel columns in the prior art are generally flat hollow rectangular steel columns, which have large flexibility and are also easily subjected to impact and extrusion. The verticality of the hollow steel columns is deviated, which directly affects the overall rigidity, integrity and firmness of the steel frame, and further affects the engineering quality of the fabricated steel structure or the fabricated steel structure of the fabricated residential building.

[0005] To solve the above technical problems, the prior art generally adopts three sets of devices to solve the problems: one set of detection device, such as a plurality of strain gauges combined with a computer, monitors the perpendicularity of each hollow steel column, such as a flat hollow rectangular steel column, at any time during construction. One set of perpendicularity adjustment device, such as screw rod type push-pull device, pushes or pulls each hollow steel column to make it vertical. One set of traction fixing device, such as four pull ropes or traction ropes or cable wind ropes are pulled around the top end of each hollow steel column and fixed to the bottom end of the hollow steel column, the ground below the bottom end or other fixed points in the steel frame and other points in the steel frame. However, the above device has a complex structure, cumbersome operation, and needs to occupy the internal space of the steel frame, which interferes with the final screwing of the bolt and nut and the construction of supplementary welding and pouring of floor steel reinforced concrete; especially the fixing effect of the pull rope is not ideal, and there are still technical problems of inclination of the hollow steel column during actual construction process, which affects the overall stiffness of the steel frame and the quality of the steel structure project. SUMMARY

[0006] One of the technical problems to be solved by the present application is to provide a steel frame fixing structure which is relatively simple in structure, relatively convenient in operation, does not occupy the internal space of the steel frame and has a relatively good fixing effect.

[0007] One of the technical solutions of the present application is to provide a steel frame fixing structure, which comprises a bottom rectangular steel frame fixed with a reinforced concrete foundation and composed of a plurality of equal-height bottom hollow rectangular steel columns and a plurality of bottom horizontal steel beams, and an extension part rectangular steel frame fixed with the plurality of bottom hollow rectangular steel columns and composed of a plurality of equal-height extension part hollow rectangular steel columns and a plurality of extension part horizontal steel beams; a fixing member is fixed to the outer side of each extension part hollow rectangular steel column at the height of the upper extension part rectangular steel frame, a jack is fixed to the outer side of each hollow rectangular steel column at the height of the rectangular steel frame of the vertical adjacent periphery below the lower extension part rectangular steel frame, a tension rod is fixed to the outer side of each extension part hollow rectangular steel column at the height of one layer of extension part rectangular steel frame between the height of the fixing member and the jack, the outer end of the tension rod is rotationally fitted with a pulley, one end of a steel wire rope is fixed to the fixing member, the other end of the steel wire rope is fixed to the free end of the piston rod of the jack after winding around the pulley, and the steel wire rope is pulled tight by the jack.

[0008] With the above structure, the steel frame fixing structure of the present invention has the following advantages: The steel frame fixing structure is simple in structure and can be pre-installed simultaneously with the assembly of the extended rectangular steel frame, which is composed of multiple equally-height extended hollow rectangular steel columns and multiple extended horizontal steel beams. Its construction operation is also convenient, quick, time-saving, and labor-saving; only the jacks at both ends of each row need to be symmetrically pulled outwards to tighten. Furthermore, it does not occupy the internal space of the steel frame and does not interfere with the final tightening of bolts and nuts, supplementary welding, or the pouring of reinforced concrete for the floor slab. Furthermore, the fixing effect of the steel frame fixing structure of this invention is very ideal. Even if the hollow rectangular steel column is still a flat rectangular hollow steel column, in the actual construction process, it is only necessary to use the steel frame fixing structure of this invention in conjunction with a verticality correction instrument such as a total station. During the construction process of installing the steel frame of the extension section every two or three floors, pouring the reinforced concrete of the extension section floor slab, and pouring the concrete inside the hollow rectangular steel column of the extension section, and after the construction is completed, the hollow rectangular steel column of the extension section will always maintain a high degree of verticality. This effectively ensures the overall rigidity of the steel frame, such as good integrity and good firmness, and effectively ensures the good engineering quality of the steel structure of the prefabricated residential building, or the prefabricated steel structure.

[0009] Furthermore, the extended rectangular steel frame consists of two layers: an upper extended rectangular steel frame and a lower extended rectangular steel frame. The lower layer of the extended rectangular steel frame is formed by one layer of the hollow rectangular steel column surrounding the fastener and jack. With this structure, and considering the two-layer extended rectangular steel frame, the jack is fixed to the outside of the hollow rectangular steel column at the lower layer of the construction layer. This further ensures the high-precision verticality of the hollow rectangular steel column, good overall rigidity of the steel frame, and excellent engineering quality of the prefabricated residential building's steel structure.

[0010] Furthermore, the extended rectangular steel frame has three layers: an upper extended rectangular steel frame, a middle extended rectangular steel frame, and a lower extended rectangular steel frame. The first layer of the extended rectangular steel frame around each hollow rectangular steel column of the extended section between the fixing member and the jack height is either a middle or lower extended rectangular steel frame. With this structure, when the extended rectangular steel frame has three layers, the jack is fixed to the outside of the hollow rectangular steel column of the extended section at the lower or middle extended rectangular steel frame. This further ensures the high-precision verticality of the hollow rectangular steel column, good overall rigidity of the steel frame, and good engineering quality of the prefabricated residential building's steel structure, or prefabricated steel structure.

[0011] Furthermore, the bottom rectangular steel frame has two or three layers. The jacks are fixed to the outside of the upper bottom rectangular steel frame at the height of each bottom hollow rectangular steel column, or to the outside of the upper extended rectangular steel frame below each lower extended hollow rectangular steel column. With this structure, compared to placing the jacks on the outside of the middle or lower bottom rectangular steel frame, or on the outside of the lower middle or lower extended rectangular steel frame, it saves on material costs such as wire ropes. The tension of the wire ropes is also relatively strong, further ensuring that the extended hollow rectangular steel columns always maintain high-precision verticality, the overall rigidity of the steel frame is good, and the engineering quality of the prefabricated residential building's steel structure, or prefabricated steel structure, is excellent.

[0012] Another technical problem to be solved by the present invention is to provide a method for constructing prefabricated steel structures using a steel frame fixing structure that is relatively easy to operate, does not occupy the internal space of the steel frame, and has a relatively good fixing effect.

[0013] Another technical solution of the present invention is to provide a method for constructing prefabricated steel structures using a steel frame fixing structure, comprising the following construction steps:

[0014] 1) Construct a reinforced concrete foundation and a bottom rectangular steel frame fixed to the reinforced concrete foundation and consisting of multiple bottom hollow rectangular steel columns of equal height and multiple bottom horizontal steel beams. Maintain the verticality of all bottom hollow rectangular steel columns, pour the reinforced concrete of the bottom floor slab and the concrete inside all bottom hollow rectangular steel columns, and wait for the reinforced concrete of the bottom floor slab and the concrete inside the bottom hollow rectangular steel columns to reach the predetermined strength.

[0015] 2) Hoist the extended rectangular steel frame, which consists of multiple hollow rectangular steel columns of equal height and multiple horizontal steel beams. Place the hollow rectangular steel columns on the corresponding bottom hollow rectangular steel columns, and initially tighten the bolts that are inserted into multiple pairs of connecting plates and upper and lower connecting blocks.

[0016] During the initial tightening and fixing process, a verticality correction instrument is used in conjunction with the initial tightening to ensure that each hollow rectangular steel column of the joint is vertical.

[0017] 3) Pre-installed or on-site installed steel frame fixing structure: A tension bar is fixed on the outside of the bottom or middle layer of the rectangular steel frame of each hollow rectangular steel column of the perimeter. The outer end of the tension bar is rotated to engage with a pulley. A fixing piece is fixed on the outside of the upper layer of the rectangular steel frame of each hollow rectangular steel column of the perimeter. A jack is fixed on the outside of the bottom rectangular steel frame of each bottom hollow rectangular steel column of the perimeter below the lower layer of the rectangular steel frame. One end of a steel wire rope is fixed to the fixing piece. After the steel wire rope is wound around the pulley, the other end is fixed to the free end of the piston rod of the jack to form a tensioning structure.

[0018] 4) Use jacks to tighten the steel wire ropes of the two outer tensioning structures of each row symmetrically from left to right or front to back. While tightening the steel wire ropes, use a verticality correction instrument in conjunction with the jacks to make each hollow rectangular steel column of the extension section vertical.

[0019] 5) Tighten all bolts and nuts in sequence, perform additional welding, set up formwork for pouring reinforced concrete for the two-layer extension floor slab, tie the reinforcing cage and pour concrete, and pour concrete inside the hollow rectangular steel columns of the extension. During the construction process, use a verticality correction instrument and jacks to keep each hollow rectangular steel column of the extension vertical.

[0020] 6) Once the reinforced concrete of the floor slab to be extended and the concrete inside the hollow rectangular steel column of the extension section have reached the predetermined strength, loosen all the steel wire ropes with all the jacks and remove all the tensioning structures.

[0021] 7) Repeat construction steps 2) to 6) until the steel frame installation of all joints of the steel structure is completed, and the reinforced concrete of the floor slabs of the joints and the concrete of the hollow rectangular steel columns of the joints are poured. In this construction step, the hollow rectangular steel columns of the joints that are placed on each other are the vertically adjacent hollow rectangular steel columns of the joints that have been completed.

[0022] After adopting the above construction steps, the method of constructing prefabricated steel structures using a steel frame fixing structure according to the present invention has the following advantages: The steel frame fixing structure used in the construction method of the present invention has a simple structure and can be pre-installed simultaneously with the assembly of the extended rectangular steel frame, which is composed of multiple extended hollow rectangular steel columns of equal height and multiple extended horizontal steel beams. Its construction operation is convenient, quick, time-saving, and labor-saving, requiring only symmetrical outward tightening of the jacks at both ends of each row. Furthermore, it does not occupy the internal space of the steel frame and does not interfere with the final tightening of screws, supplementary welding, and pouring of reinforced concrete for the floor slab. Furthermore, the fixing effect of the steel frame fixing structure used in the construction method of this invention is very ideal. Even if the hollow rectangular steel column is still a flat rectangular hollow steel column, in the actual construction process, it is only necessary to use the steel frame fixing structure used in the construction method of this invention in conjunction with a verticality correction instrument such as a total station. During the construction process of installing the steel frame every two or three floors, pouring the reinforced concrete of the floor slab, and pouring the concrete inside the hollow rectangular steel column of the extension part, and after the construction is completed, the hollow rectangular steel column of the extension part will always maintain a high degree of verticality. This effectively ensures the overall rigidity of the steel frame, such as good integrity and good firmness, and effectively ensures the good engineering quality of the steel structure of the prefabricated residential building, or prefabricated steel structure.

[0023] Furthermore, the jacks mentioned in construction steps 2) to 6) are fixed to the outside of the upper bottom rectangular steel frame of each hollow steel column. The jacks mentioned in construction step 7) are fixed to the outside of the upper extension rectangular steel frame of each vertically adjacent hollow steel column below the lower extension rectangular steel frame. By adopting the above construction steps, the cost of materials such as steel wire ropes is relatively reduced, and the tension of the steel wire ropes is relatively strong, further ensuring the high-precision verticality of the hollow steel columns, good overall rigidity of the steel frame, and good engineering quality of the prefabricated residential building's steel structure, or prefabricated steel structure. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the steel frame structure in this invention. Figure 1 (Bolts and nuts are not shown in the diagrams below, and the same applies to the following diagrams; bolt through-holes are only shown in the following diagrams.) Figure 4 One bolt through-hole is marked in the middle, but none of the bolt through-holes in the other drawings are marked; only one of the two-layer extension floor slabs is shown.

[0025] Figure 2 yes Figure 1 A magnified structural diagram of A in the diagram.

[0026] Figure 3 This is a schematic diagram of the steel frame structure in this invention. Figure 2 .

[0027] Figure 4 yes Figure 3 A magnified structural diagram of B in the diagram.

[0028] Figure 5 This is a schematic diagram of the structure of two sets of frame fixing structures of the present invention at a corner.

[0029] Figure 6 yes Figure 5 A magnified structural diagram of C.

[0030] The diagram shows: 1. Bottom rectangular steel frame; 2. Bottom floor slab; 3. Extended rectangular steel frame; 4. Extended floor slab; 5. Extended hollow rectangular steel column; 6. Upper extended rectangular steel frame; 7. Fastener; 8. Lower extended rectangular steel frame; 9. Tension bar; 10. Jack; 11. Upper bottom rectangular steel frame; 12. Middle bottom rectangular steel frame; 13. Lower bottom rectangular steel frame; 14. Bottom hollow rectangular steel column; 15. Wire rope; 16. Groove; 17. Pulley; 18. Pin; 19. Connecting block; 20. Connecting plate; 21. Bottom horizontal steel beam; 22. Extended horizontal steel beam; 23. Steel plate; 24. Semi-circular steel ring; 25. Piston rod; 26. Steel bracket; 27. Bolt through hole; 28. Reinforcing member. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical means involved in the various specific embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown.

[0033] The steel frame fixing structure of this invention includes a bottom rectangular steel frame 1, fixed to a reinforced concrete foundation and composed of multiple bottom hollow rectangular steel columns 14 of equal height and multiple bottom horizontal steel beams 21. It also includes an extended rectangular steel frame 3, detachably fixed to the multiple bottom hollow rectangular steel columns 14 and composed of multiple extended hollow rectangular steel columns 5 of equal height and multiple extended horizontal steel beams 22. Both the bottom horizontal steel beams 21 and the extended horizontal steel beams 22 can be made of H-beams. The extended hollow rectangular steel columns 5 include multiple peripheral... Figure 1 The ten hollow rectangular steel columns 5 shown in the figure, and the multiple columns in the middle or center, such as Figure 1The diagram shows two hollow rectangular steel columns 5 for extension sections. It's easy to understand that the bottom hollow rectangular steel columns 14 also include multiple peripheral columns (e.g., ten bottom hollow rectangular steel columns 14) and multiple central columns (e.g., two bottom hollow rectangular steel columns 14). Both the bottom hollow rectangular steel columns 14 and the extension hollow rectangular steel columns 5 can be flat, i.e., hollow rectangular steel tubes with a rectangular cross-section. The extension section can also be called the heightening section.

[0034] A fixing member 7 is fixed to the outside of the upper extension rectangular steel frame 6 at the height of each hollow rectangular steel column 5. A jack 10 is fixed to the outside of the bottom rectangular steel frame of each bottom hollow rectangular steel column 14 below the lower extension rectangular steel frame 8 at the height of the bottom rectangular steel frame, as at the upper bottom rectangular steel frame 11. A tension rod 9 is fixed to the outside of the lower extension rectangular steel frame 8 at the height of the first extension rectangular steel frame of each hollow rectangular steel column 5 between the fixing member 7 and the jack 10. The outer end of the tension rod 9 is rotatably fitted with a pulley 17. One end of a steel wire rope 15 is fixed to the fixing member 7. After the steel wire rope 15 is wrapped around the pulley 17, the other end is fixed to the free end of the piston rod 25 of the jack 10 and is tightened by the jack 10.

[0035] like Figure 1 , Figure 3 and Figure 5 As shown, the extended rectangular steel frame 3 can be two layers: an upper extended rectangular steel frame 6 and a lower extended rectangular steel frame 8. The lower extended rectangular steel frame 8 is one layer of the extended hollow rectangular steel column 5 around the height between the fixing member 7 and the jack 10. That is, as mentioned above, a tension rod 9 is fixed on the outside of the lower extended rectangular steel frame 8 of each extended hollow rectangular steel column 5 around the height between the fixing member 7 and the jack 10.

[0036] The extended rectangular steel frame can also be three-layered: an upper extended rectangular steel frame, a middle extended rectangular steel frame, and a lower extended rectangular steel frame. The first layer of the extended rectangular steel frame for each hollow rectangular steel column surrounding the distance between the fixing member and the jack height can be either a middle or lower extended rectangular steel frame. That is, if it is a three-layered extended rectangular steel frame, a tension rod can be fixed to the outside of the lower extended rectangular steel frame of each hollow rectangular steel column surrounding the distance between the fixing member and the jack height, or a tension rod can be fixed to the outside of the middle extended rectangular steel frame of each hollow rectangular steel column surrounding the distance between the fixing member and the jack height.

[0037] like Figure 1 ,Figure 3 and Figure 5 As shown, the bottom rectangular steel frame 1 has two or three layers (three layers are shown in the figure), and the jack 10 is preferably fixed on the outside of the upper bottom rectangular steel frame 11 at the height of each bottom hollow rectangular steel column 14.

[0038] Because the hollow rectangular steel column 14 at the bottom can have two or three layers of bottom rectangular steel frames 1, a jack 10 is fixed to the outside of the bottom rectangular steel frame 1 at the height of each of the vertically adjacent bottom hollow rectangular steel columns 14 below the bottom extended rectangular steel frame 8. Generally, this refers to the upper bottom rectangular steel frame 11 of the two or three layers of the bottom rectangular steel frame 1. Of course, the jack can also be set on the middle bottom rectangular steel frame 12 and the lower bottom rectangular steel frame 13, but the steel wire rope 15 is pulled down longer. Therefore, it is preferable that the jack 10 is set on the outside of the bottom hollow rectangular steel column 14 at the height of the upper bottom rectangular steel frame 11.

[0039] The tension rod 9 can be made of rectangular steel pipe. The tension rod 9 can be fixed to the hollow rectangular steel column 5 of the extension part by welding. When disassembling, the rectangular steel pipe can be cut. Alternatively, vertical fixing blocks can be welded to the top and bottom of the inner end of the rectangular steel pipe. The vertical fixing blocks have multiple screw holes, and the hollow rectangular steel column of the extension part has multiple threaded holes. Multiple screws are used for fixing. When disassembling, multiple screws can be loosened.

[0040] The outer end of the tension bar 9 is rotatably fitted with a pulley 17. The specific structure can be as follows: the outer end of a rectangular steel tube has a groove 16, and the pulley 17 is housed within the groove 16. A pin 18 is fixed to the steel plates 23 on both sides of the groove 16, either inserted into pin holes on the steel plates 23, or axially limited by welding or by using a pin with a large end and a cotter pin on the other end for axial limitation. The pulley 17 and the pin 18 are rotatably fitted, and the ends of the steel plates 23 on both sides can be rounded. The tension bar 9 is also called a cantilever.

[0041] The fixing component 7 can be a steel tie block welded to the outside of the hollow rectangular steel column 5 of the extension section. The end of the steel wire rope 15 can pass through the steel wire rope hole on the steel tie block and then be welded to the steel tie block for fixation. The steel tie block can be cut to remove it. Alternatively, a vertical fixing block can be welded to the inner end of the steel tie block. The vertical fixing block has multiple screw holes, and the hollow rectangular steel column of the extension section has multiple threaded holes. Multiple screws are used for fixing, and multiple screws can be loosened to remove it.

[0042] The jack 10 can be vertically fixed by welding or by using fixing blocks and screws to a steel bracket 26. The steel bracket 26 can be welded to the outside of the bottom hollow rectangular steel column 14. The steel bracket 26 can be cut during disassembly. Alternatively, a vertical fixing block with multiple screw holes can be welded to the steel bracket. The hollow rectangular steel column of the extension section has multiple threaded holes, and multiple screws can be used for fixing. Disassembly can be achieved by loosening these screws. The other end of the wire rope 15 is fixed to the free end of the piston rod 25 of the jack 10. This can be achieved by welding a semi-circular steel ring 24 to the free end face of the piston rod 15. The other end of the wire rope 15 can be wrapped around this semi-circular steel ring 24 and welded to it. The piston rod 25 is also called a telescopic rod. A frame-type reinforcing member 28 can also be provided at the top of the jack 10 to make the jack 10 more securely fixed.

[0043] This invention relates to a method for constructing prefabricated steel structures using a steel frame fixed structure, comprising the following construction steps:

[0044] 1) Construct a reinforced concrete foundation and a bottom rectangular steel frame 1 fixed to the reinforced concrete foundation and consisting of multiple bottom hollow rectangular steel columns 14 of equal height and multiple bottom horizontal steel beams 21. Maintain the verticality of all bottom hollow rectangular steel columns 14, and pour reinforced concrete for the bottom floor slab 2. If it is a three-story building, pour reinforced concrete for the bottom floor slab 2 of the lower floor, the bottom floor slab 2 of the middle floor, the bottom floor slab 2 of the upper floor, and the concrete inside all the bottom hollow rectangular steel columns 14. Wait until the reinforced concrete of the bottom floor slab 2 and the concrete inside the bottom hollow rectangular steel columns 14 reach the predetermined strength.

[0045] 2) Hoist the extended rectangular steel frame 3, which consists of multiple equally tall extended hollow rectangular steel columns 5 and multiple extended horizontal steel beams 22. Place the extended hollow rectangular steel columns 5 on corresponding bottom hollow rectangular steel columns 14, and initially tighten the multiple bolts inserted into the multiple pairs of connecting plates 20 and the upper and lower connecting blocks 19 with nuts. It is easy to understand that after the bolts pass through their respective bolt holes 27, they are initially tightened with their respective nuts.

[0046] During the initial tightening and fixing process, a verticality correction instrument, such as a total station, is used in conjunction with the initial tightening to ensure that each hollow rectangular steel column 5 of the extension section is vertical.

[0047] 3) Pre-installation or on-site installation of the steel frame fixing structure described in the above technical solution: A tension rod 9 is fixed on the outside of the bottom extension rectangular steel frame 8 at the height of each hollow rectangular steel column 5 of the perimeter. The outer end of the tension rod 9 is rotatably fitted with a pulley 17. A fixing piece 7 is fixed on the outside of the upper extension rectangular steel frame 6 at the height of each hollow rectangular steel column 5 of the perimeter. A jack 10 is fixed on the outside of the upper bottom rectangular steel frame 11 in the bottom rectangular steel frame 1 of each vertically adjacent bottom hollow rectangular steel column 14 below the bottom extension rectangular steel frame 8. One end of a steel wire rope 15 is fixed to the fixing piece 7. After the steel wire rope 15 is wrapped around the pulley 17, the other end is fixed to the free end of the piston rod 25 of the jack 10 to form a tensioning structure.

[0048] It is not difficult to understand that the hollow rectangular steel columns 5 and 14 in the middle of each row of perimeter columns are all fitted with the tensioning structure described in this construction step on one of their outer sides. See [link / reference]. Figure 5 The hollow rectangular steel columns 5 at the corners of each row and the hollow rectangular steel columns 14 at the bottom are each fitted with the tensioning structure described in this construction step on two outer sides that are at 90° to each other.

[0049] 4) Use jacks 10 to tighten the steel wire ropes 15 of the tensioning structure on both sides of each row symmetrically or symmetrically front and back. While tightening the steel wire ropes 15, use a verticality correction instrument such as a total station in conjunction with jacks 10 to make each hollow rectangular steel column 5 of the extension part vertical.

[0050] 5) Tighten all bolts and nuts in sequence, perform additional welding, pour the reinforced concrete of the two-layer extension floor slab 4, set up the formwork, tie the reinforcing cage and pour the concrete, and pour the concrete inside the hollow rectangular steel column 5 of the extension. During the construction process, use verticality correction instruments such as total station and jack 10 to keep each hollow rectangular steel column 5 of the extension vertical.

[0051] 6) Once the reinforced concrete of the extended floor slab 4 and the concrete inside the hollow rectangular steel column of the extended section have reached the predetermined strength, loosen all the steel wire ropes 15 through all the jacks 10 and remove all the tensioning structures.

[0052] 7) Repeat construction steps 2) to 6) until the steel frame installation of all layers of the prefabricated steel structure is completed, and the reinforced concrete of the extension floor slab 4 and the concrete inside the extension hollow rectangular steel columns 5 are poured. It is easy to understand that the hollow rectangular steel columns 5 placed on all extension sections in this construction step are the vertically adjacent lower extension rectangular hollow steel columns 5 that have been completed, not the bottom rectangular hollow steel columns 14 mentioned in construction steps 2) to 6).

[0053] As described above, the jacks 10 mentioned in construction steps 2) to 6) are fixed on the outside of the upper bottom rectangular steel frame 11 at the height of each bottom hollow rectangular steel column 14.

[0054] It is not difficult to understand that the construction of the first extension hollow rectangular steel column 5 and the extension rectangular steel frame 3 from bottom to top is as follows: each hollow rectangular steel column that is vertically adjacent to the lower extension rectangular steel frame 8 refers to the bottom hollow rectangular steel column 14, and the height of the rectangular steel frame refers to the height of the bottom rectangular steel frame, such as the height of the upper bottom rectangular steel frame 11.

[0055] The construction proceeds from bottom to top, including the second hollow rectangular steel column 5, the second and subsequent hollow rectangular steel columns 5, and the rectangular steel frame 3. The hollow rectangular steel columns located vertically adjacent to each other below the lower rectangular steel frame 8 refer to the lower hollow rectangular steel column 5. The height of the rectangular steel frame refers to the height of the lower rectangular steel frame below the upper rectangular steel frame 6.

[0056] See Figure 1 In construction step 7), the jack 10 is fixed to the outside of the upper part of the rectangular steel frame 6 at the height of each vertically adjacent hollow rectangular steel column of the lower part of the construction layer, below the lower part of the rectangular steel frame 8. This can be understood as follows: if we consider... Figure 1 If the bottom rectangular steel frame 1 is considered as the already constructed extended rectangular steel frame, then the height of the upper extended rectangular steel frame of each vertically adjacent hollow rectangular steel column below the lower extended rectangular steel frame 8 of the construction layer is... Figure 1 At the height of the upper bottom rectangular steel frame 11.

[0057] Components, structures, or quantities not marked above are not shown in the drawings. The drawings are for illustrative purposes only; in case of any discrepancies between the drawings and the text description, or between the drawings themselves, the text description shall prevail.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for constructing prefabricated steel structures using a steel frame fixed structure, comprising the following construction steps: 1) Construct a reinforced concrete foundation and a bottom rectangular steel frame fixed to the reinforced concrete foundation and consisting of multiple bottom hollow rectangular steel columns of equal height and multiple bottom horizontal steel beams. Maintain the verticality of all bottom hollow rectangular steel columns, pour the reinforced concrete of the bottom floor slab and the concrete inside all bottom hollow rectangular steel columns, and wait for the reinforced concrete of the bottom floor slab and the concrete inside the bottom hollow rectangular steel columns to reach the predetermined strength. 2) The elongated rectangular steel frame, consisting of multiple equal-height extended hollow rectangular steel columns and multiple extended horizontal steel beams, is hoisted and fixed. The extended hollow rectangular steel columns are placed on corresponding bottom hollow rectangular steel columns, and multiple bolts inserted into multiple pairs of connecting plates and upper and lower connecting blocks are initially tightened with nuts. The characteristic feature is that: During the initial tightening and fixing process, a verticality correction instrument is used in conjunction with the initial tightening to ensure that each hollow rectangular steel column of the joint is vertical. 3) Pre-installed or on-site installed steel frame fixing structure: A tension bar is fixed on the outside of the bottom or middle layer of the rectangular steel frame of each hollow rectangular steel column of the perimeter. The outer end of the tension bar is rotated to engage with a pulley. A fixing piece is fixed on the outside of the upper layer of the rectangular steel frame of each hollow rectangular steel column of the perimeter. A jack is fixed on the outside of the bottom rectangular steel frame of each bottom hollow rectangular steel column of the perimeter below the lower layer of the rectangular steel frame. One end of a steel wire rope is fixed to the fixing piece. After the steel wire rope is wound around the pulley, the other end is fixed to the free end of the piston rod of the jack to form a tensioning structure. 4) Use jacks to tighten the steel wire ropes of the two outer tensioning structures of each row symmetrically from left to right or front to back. While tightening the steel wire ropes, use a verticality correction instrument in conjunction with the jacks to make each hollow rectangular steel column of the extension section vertical. 5) Tighten all bolts and nuts in sequence, perform additional welding, set up formwork for pouring reinforced concrete for the two-layer extension floor slab, tie the reinforcing cage and pour concrete, and pour concrete inside the hollow rectangular steel columns of the extension. During the construction process, use a verticality correction instrument and jacks to keep each hollow rectangular steel column of the extension vertical. 6) Once the reinforced concrete of the floor slab to be extended and the concrete inside the hollow rectangular steel column of the extension section have reached the predetermined strength, loosen all the steel wire ropes with all the jacks and remove all the tensioning structures. 7) Repeat construction steps 2) to 6) until the steel frame installation of all joints of the steel structure is completed, and the reinforced concrete of the floor slabs of the joints and the concrete of the hollow rectangular steel columns of the joints are poured. In this construction step, the hollow rectangular steel columns of the joints that are placed on each other are the vertically adjacent hollow rectangular steel columns of the joints that have been completed.

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