A prefabricated assembled steel structure building frame and its construction method

Abstract

This invention relates to the field of building steel structure technology and discloses a prefabricated assembled steel structure building frame and construction method. It includes two sets of supports arranged parallel to each other on the left and right sides. Several sets of crossbeam assemblies are fixed between the two sets of supports at equal intervals using long bolts. A top connecting seat is centrally connected to the top of each set of crossbeam assemblies, and the end fasteners at both ends of the top connecting seat are fixed to the supports. The length of the crossbeam assemblies is adjustable. Both ends of the crossbeam assemblies are inserted into the supports, and after the long bolts are locked with the tensioning components inside the crossbeam assemblies, the upper middle part of the crossbeam assembly is snapped into the bottom of the top connecting seat. Simultaneously, the tensioning components lock the length of the crossbeam assembly. The crossbeam assemblies of this invention achieve stepless length adjustment through a sliding connection between the central I-beam and the extension frames at both ends, flexibly adapting to different spacings of the left and right sets of supports. No on-site cutting is required, adapting to different building spans, and offering strong versatility for rapid assembly.

Description

Technical Field

[0001] This invention relates to the field of building steel structure technology, specifically to a prefabricated assembled steel structure building frame and its construction method. Background Technology

[0002] In existing prefabricated steel structure building frames, due to variations in building bay width, fixed-length beams require on-site cutting for adaptation. This process is cumbersome, time-consuming, and prone to compromising structural integrity and connection strength after cutting. Some adjustable beams utilize simple sleeve telescopic structures, lacking effective restraint, making them susceptible to movement and torsion, resulting in insufficient connection stiffness and inability to meet load-bearing requirements. Furthermore, existing assembly methods often require on-site welding or the alignment and installation of numerous fasteners, complicating assembly steps, increasing construction difficulty, reducing efficiency, and hindering rapid frame assembly. This makes it difficult to meet the efficient and convenient construction requirements of prefabricated buildings. Therefore, we introduce a prefabricated steel structure building frame and construction method. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated assembled steel structure building frame and construction method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A prefabricated assembled steel structure building frame includes two sets of supports arranged in parallel on the left and right. Several sets of crossbeam assemblies are fixed between the two sets of supports by long bolts at equal intervals. A top connecting seat is connected to the top of the several sets of crossbeam assemblies in the center. The end fasteners at both ends of the top connecting seat are fixed to the supports. The length of the crossbeam assembly is adjustable. Both ends of the crossbeam assembly are inserted into the bracket. After the long bolts are locked with the tensioning member inside the crossbeam assembly, the middle of the upper end of the crossbeam assembly is snapped into the bottom of the top connecting seat. At the same time, the tensioning member locks the length of the crossbeam assembly.

[0005] Preferably, the support includes two sets of columns, front and rear, and longitudinal beams fixed to the top of the two sets of columns.

[0006] Preferably, the upper inner side of the column is provided with a slot, and both ends of the longitudinal beam are inserted into the corresponding slots.

[0007] Preferably, the end fastener includes an end seat fixed to both ends of the top connecting seat, an inner side plate symmetrically arranged on both sides of one end of the end seat, and an outer side plate symmetrically arranged on both sides of the other end of the end seat. The outer and inner side plates are fixed to the inner and outer sides of the top of the column with screws, respectively.

[0008] Preferably, the inner side of the end seat is provided with a sleeve groove that is sleeved and fixed to the outer sides of both ends of the top connecting seat.

[0009] Preferably, the crossbeam assembly includes a central I-beam and extension frames that slide at both ends of the central I-beam; The extension frame includes a socket frame fitted on the outside of the middle I-beam, a buckle seat fixed at the top of the socket frame, and two sets of upper and lower buckle blocks fixed on one side of the socket frame by a U-shaped frame. The lower end of the top connecting seat is provided with a buckle groove, the buckle seat is snapped into the buckle groove, the inner wall of the longitudinal beam is provided with a slot, the end of the U-shaped frame is inserted into the corresponding slot, and the longitudinal beam is also provided with a through groove, the snap-fit ​​block is inserted into the corresponding through groove.

[0010] Preferably, the upper and lower ends of the intermediate I-beam are provided with sliding grooves, and the U-shaped frame slides in the sliding grooves; The U-shaped frame is equipped with a plug-in seat, which is inserted into the reserved inner grooves at both ends of the middle I-beam; The connector has a pre-drilled hole inside and a vertical limiting groove on its inner side. The tensioning component includes a spring installed in a pre-drilled hole, an internally threaded cylinder inserted into a vertical limiting groove, a limiting ramp block fixed to the inner end of the internally threaded cylinder, and elastic teeth distributed vertically within the vertical limiting groove. The inner end of the elastic tooth abuts against the surface of the limiting ramp block, and the other end of the spring is fixed to one end of the internal threaded cylinder; The long bolt passes through the longitudinal beam and the plug-in seat and is then screwed into the internal threaded cylinder.

[0011] This invention also provides a construction method for a prefabricated assembled steel structure building frame, specifically including the following steps: S1. Insert both ends of the crossbeam assembly into the bracket; S2. Fix the end fasteners to both ends of the top connector, and place the top connectors at the upper middle of several sets of crossbeam assemblies, and then fix the end fasteners to the bracket. S3. After the long bolt passes through the bracket, it locks with the tensioning member inside the crossbeam assembly. The middle of the upper end of the crossbeam assembly is snapped into the bottom of the top connecting seat. At the same time, the tensioning member locks the length of the crossbeam assembly.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the crossbeam assembly of the present invention can achieve stepless length adjustment by slidingly connecting the middle I-beam with the extension frames at both ends, flexibly adapting to the different spacing of the left and right sets of supports, without the need for on-site cutting, adapting to different building spans, and having strong versatility.

[0013] After the length of the crossbeam assembly of this invention is adjusted, the U-shaped frame is inserted into the slot of the longitudinal beam, and the snap-fit ​​block is embedded in the through groove. With the self-locking of the tensioning component and the engagement of the snap-fit ​​seat with the snap-fit ​​groove, multiple limits ensure the connection strength between the crossbeam assembly and the bracket, resisting deformation and preventing loosening. While locking the length of the crossbeam assembly, the snap-fit ​​seat at the top of the extension frame is simultaneously pushed into the snap-fit ​​groove at the lower end of the top connecting seat, so that the top of the crossbeam assembly and the top connecting seat form a firm fit, forming an integrated force-bearing system of "bracket, top connecting seat and crossbeam assembly". The whole adopts a prefabricated snap-fit, plug-in and linkage locking structure, which does not require on-site welding, simplifies assembly and alignment, and achieves multiple fixation with single-point locking, greatly simplifying the process, improving installation efficiency and achieving rapid assembly. Attached Figure Description

[0014] Figure 1 This is an exploded structural diagram of the overall assembly of the present invention; Figure 2 This is a schematic diagram of the structure of the end fastener of the present invention; Figure 3 This is a schematic diagram of the top connector of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the cross-sectional structure; Figure 5 This is an exploded structural diagram of the support structure of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the three-dimensional structure from another perspective; Figure 7 This is an exploded structural diagram of the beam assembly of the present invention; Figure 8 This is an exploded structural diagram of the assembly of the internally threaded cylinder and the plug-in socket of the present invention; Figure 9 For the present invention Figure 8 A schematic diagram of the cross-sectional structure; Figure 10 This is a schematic diagram of the structure of the beam assembly of the present invention; Figure 11 This is a schematic diagram of the three-dimensional structure of the entire assembled invention; Figure 12 For the present invention Figure 11 A partial cross-sectional structural diagram.

[0015] In the diagram: 1. End fastener; 101. End seat; 102. Socket groove; 103. Inner side plate; 104. Outer side plate; 2. Top connecting seat; 201. Snap groove; 3. Screw; 4. Crossbeam assembly; 401. Middle I-beam; 402. Slide groove; 403. Reserved inner groove; 404. Socket frame; 405. Snap seat; 406. U-shaped frame; 407. Snap block; 408. Insertion seat; 409. Elastic tooth; 410. Vertical limiting groove; 411. Internal threaded cylinder; 412. Limiting ramp block; 413. Reserved hole; 414. Spring; 5. Long bolt; 6. Bracket; 601. Column; 602. Snap groove; 603. Longitudinal beam; 604. Slot; 605. Through groove. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example: Please see Figures 1-12 The present invention provides a technical solution: A prefabricated assembled steel structure building frame includes two sets of supports 6 arranged in parallel on the left and right. Each support 6 includes two sets of columns 601 at the front and rear, and longitudinal beams 603 fixed to the top of the two sets of columns 601. The upper inner side of the column 601 is provided with a slot 602. The two ends of the longitudinal beam 603 are inserted into the corresponding slots 602. The two ends of the longitudinal beam 603 are inserted into the slots 602 of the column 601. The prefabricated snap-fit ​​assembly does not require on-site welding and the assembly speed is fast. The slots 602 form an embedded limit, restricting the longitudinal beam 603 from shifting forward, backward, left, and right, and ensuring the overall squareness of the support 6 and the rigidity of the foundation support.

[0018] The two ends of the longitudinal beam 603 are directly inserted into the slots 602 on the inner side of the upper end of the column 601. The prefabricated snap-fit ​​structure eliminates the need for on-site welding and complex drilling and alignment. The pre-formed bracket 6 can be directly pre-assembled, saving the on-site splicing and adjustment process and enabling rapid assembly of the bracket 6.

[0019] Several sets of crossbeam assemblies 4 are fixed between the two sets of brackets 6 by long bolts 5 at equal intervals. The top of the several sets of crossbeam assemblies 4 is connected to the top connecting seat 2 in the center. The end fasteners 1 at both ends of the top connecting seat 2 are fixed to the brackets 6. The end fasteners 1 include end seats 101 fixed at both ends of the top connecting seat 2, inner side plates 103 symmetrically arranged on both sides of one end of the end seat 101, and outer side plates 104 symmetrically arranged on both sides of the other end of the end seat 101. The outer side plates 104 and inner side plates 103 are fixed to the inner and outer sides of the top of the column 601 by screws 3 respectively.

[0020] The inner side of the end seat 101 is provided with a sleeve groove 102 that is sleeved and fixed to the outer sides of both ends of the top connecting seat 2. The end fastener 1 is positioned by sleeved and fixed to both ends of the top connecting seat 2 through the sleeve groove 102. The inner side plate 103 and the outer side plate 104 are located on the inner and outer sides of the column 601 and are fixed with screws 3. The double-sided clamping limit ensures balanced connection force and can firmly lock the relative position of the top connecting seat 2 and the bracket 6. It has strong resistance to lateral loads. The inner side plate 103 and the outer side plate 104 are located on the inner and outer sides of the top of the column 601 and are locked on both sides by screws 3. The top connecting seat 2 and the bracket 6 can be quickly fixed in one clamping. The assembly and alignment are simple and the installation steps are few.

[0021] The length of the crossbeam assembly 4 is adjustable. Both ends of the crossbeam assembly 4 are inserted into the bracket 6. After the long bolt 5 is locked with the tensioning member inside the crossbeam assembly 4, the upper middle part of the crossbeam assembly 4 is snapped into the bottom of the top connecting seat 2. At the same time, the tensioning member locks the length of the crossbeam assembly 4. The crossbeam assembly 4 includes a middle I-beam 401 and extension frames that slide at both ends of the middle I-beam 401. The extension frames include a sleeve frame 404 that fits on the outside of the middle I-beam 401 and a sleeve. The top of frame 404 is fixed with a snap-on seat 405 and the upper and lower sets of snap-on blocks 407 are fixed on one side of the sleeve frame 404 by a U-shaped frame 406; the lower end of the top connecting seat 2 is provided with a snap-on groove 201, and the snap-on seat 405 snaps into the snap-on groove 201; the snap-on seat 405 and the snap-on groove 201 snap together to realize the quick alignment and fitting of the top of the crossbeam assembly 4 with the top connecting seat 2, without the need for additional connecting parts, and the assembly efficiency is high; the multi-point snap-on linkage can distribute the vertical load at the top and improve the overall integrity of the frame.

[0022] The buckle seat 405 and buckle groove 201 rely on overall linkage displacement. The buckle seat 405 automatically snaps into the buckle groove 201, eliminating the need for manual locking with additional fasteners. This enables the crossbeam assembly 4 and the top connecting seat 2 to quickly fit together. The socket frame 404 can slide along the outside of the middle I-beam 401, the U-shaped frame 406 slides along the slide groove 402, and the plug seat 408 slides along the reserved inner groove 403. This gives the crossbeam assembly 4 stepless length adjustment capability, making it adaptable to different building spans and highly versatile. The crossbeam assembly 4 can be extended and lengthened as needed, eliminating the need for on-site cutting and modification, and directly adapting to different building spans, significantly shortening the on-site installation period.

[0023] The inner wall of the longitudinal beam 603 is provided with a slot 604, and the end of the U-shaped frame 406 is inserted into the corresponding slot 604. The longitudinal beam 603 is also provided with a through groove 605, and the snap-fit ​​block 407 is inserted into the corresponding through groove 605. The U-shaped frame 406 is inserted into the slot 604 and the snap-fit ​​block 407 is embedded in the through groove 605, forming an insertion limiting structure, which restricts the end of the crossbeam assembly 4 from moving and twisting in the bracket 6, thereby improving the tightness of the connection between the crossbeam assembly 4 and the bracket 6 and the overall resistance to deformation.

[0024] The upper and lower ends of the intermediate I-beam 401 are provided with sliding grooves 402, and the U-shaped frame 406 slides in the sliding grooves 402. The U-shaped frame 406 is provided with a plug-in seat 408 inside, which is inserted into the corresponding reserved inner grooves 403 at both ends of the intermediate I-beam 401. The plug-in seat 408 is provided with a reserved hole 413 inside, and a vertical limiting groove 410 is provided on the inner side of the plug-in seat 408. The tensioning element includes a spring 414 installed in the reserved hole 413 and inserted into the vertical limiting groove 410. The groove 410 contains an internally threaded cylinder 411, a limiting ramp block 412 fixed to the inner end of the internally threaded cylinder 411, and elastic teeth 409 distributed vertically within the vertical limiting groove 410; the plug-in seat 408 and the reserved hole 413 are integrally fitted with the tensioning component. The plug-in seat 408 is embedded in the reserved inner groove 403 to achieve positioning and installation, providing a stable mounting base for the tensioning component; the reserved hole 413 provides installation space for the spring 414. The structure is compact and does not occupy additional assembly space.

[0025] The inner end of the elastic tooth 409 abuts against the surface of the limiting ramp block 412, and the other end of the spring 414 is fixed to one end of the internal threaded cylinder 411. The long bolt 5 passes through the longitudinal beam 603 and the plug seat 408 and is screwed to the internal threaded cylinder 411. When the long bolt 5 is tightened, it drives the limiting ramp block 412 on the internal threaded cylinder 411 to squeeze the elastic tooth 409, forming a one-way self-locking limit to prevent the thread from loosening. At the same time, relying on the tooth surface of the elastic tooth 409 and the limit of the inner wall of the reserved inner groove 403, the length of the crossbeam assembly 4 after adjustment is accurately locked, with high positioning accuracy and good anti-loosening effect.

[0026] The limiting ramp block 412 compresses the elastic tooth 409, and the elastic tooth 409 opens and abuts against the inner wall of the reserved inner groove 403 to form a mechanical self-locking, which can prevent the long bolt 5 from loosening and keep the frame connection tight and without loosening for a long time. The long bolt 5 passes through the longitudinal beam 603, the plug seat 408 and is screwed to the internal threaded cylinder 411. Single-point locking can simultaneously achieve the length locking of the crossbeam assembly 4, the embedding of the crossbeam assembly 4 and the bracket 6, and the pressing and fixing of the top connecting seat 2. One-to-many linkage locking simplifies the on-site construction process, reduces the amount of fasteners used, and greatly improves the efficiency of prefabricated construction.

[0027] This invention also provides a construction method for a prefabricated assembled steel structure building frame, specifically including the following steps: S1. Insert both ends of the crossbeam assembly 4 into the bracket 6; S2. Fix the end fastener 1 to both ends of the top connecting seat 2, and place the top connecting seat 2 in the middle of the upper end of several sets of crossbeam assemblies 4, and then fix the end fastener 1 to the bracket 6. S3. After the long bolt 5 passes through the bracket 6, it is locked with the tensioning member inside the crossbeam assembly 4. The middle of the upper end of the crossbeam assembly 4 is snapped into the bottom of the top connecting seat 2. At the same time, the tensioning member locks the length of the crossbeam assembly 4.

[0028] In this invention patent, the crossbeam assembly 4 achieves stepless length adjustment through a modular telescopic structure design, which can flexibly adapt to different spacings between two sets of parallel supports 6. At the same time, relying on multi-part limiting, tension self-locking and rigid embedding structures, it ensures the connection strength with the supports 6 after length adjustment, meeting the load-bearing and deformation resistance requirements of prefabricated assembled steel structure building frames. Specific details are as follows: I. The implementation of adjustable length of crossbeam assembly 4 and the principle of adapting to different spacing of bracket 6: The crossbeam assembly 4 adopts a modular structure of "fixed in the middle and sliding at both ends". The core consists of a central I-beam 401 and extension frames that slide at both ends. Through the sliding cooperation of each component, the length can be flexibly adjusted to precisely adapt to the different spacings of the two sets of supports 6. The specific implementation method is as follows: 1. Basic telescopic structure adaptation: The extension frame 404 is directly fitted onto the outside of the middle I-beam 401, and can slide freely along the length of the middle I-beam 401, providing a basic stroke for the length adjustment of the crossbeam assembly 4; at the same time, the upper and lower ends of the middle I-beam 401 are provided with sliding grooves 402, and the U-shaped frame 406 on one side of the extension frame slides into the sliding groove 402. The plug-in seat 408 inside the U-shaped frame 406 is inserted into the corresponding reserved inner grooves 403 at both ends of the middle I-beam 401. The sliding groove 402 and the reserved inner groove 403 together limit the sliding trajectory, ensuring that the extension frame does not deviate or jam when sliding, and ensuring the smoothness of the adjustment process.

[0029] 2. Flexibility in Spacing Adaptation: When the spacing between the left and right sets of brackets 6 changes, the extension frame can be pushed and pulled to allow the socket frame 404 to slide along the middle I-beam 401, the U-shaped frame 406 to slide along the slide groove 402, and the plug-in seat 408 to slide along the reserved inner groove 403. The extension length of both ends of the crossbeam assembly 4 can be adjusted simultaneously until the overall length of the crossbeam assembly 4 is completely matched with the spacing between the two sets of brackets 6. There is no need to cut or weld the crossbeam assembly 4 on site. It has a wide range of adaptability and can meet the installation requirements of different building spans, reflecting the versatility advantage of prefabricated assembly structures.

[0030] 3. Pre-positioning and adaptation: After adjustment, the snap-fit ​​block 407 on the extension frame can be initially inserted into the corresponding through slot 605 on the longitudinal beam 603 of the bracket 6, and the end of the U-shaped frame 406 is initially aligned with the slot 604 on the inner wall of the longitudinal beam 603, realizing the pre-positioning of the crossbeam assembly 4 and the bracket 6, laying the foundation for subsequent locking and fixing, ensuring that the crossbeam assembly 4 and the bracket 6 are accurately aligned after adjustment, and avoiding the connection strength being affected by the alignment deviation.

[0031] II. After adjusting the length of the crossbeam assembly 4, ensure the core structural fit that guarantees the connection strength with the bracket 6: After the length of beam assembly 4 is adjusted, a robust connection is formed through a multi-structural combination of "multi-directional limiting + tension self-locking + rigid embedding," effectively resisting vertical loads, lateral shear forces, and torsional forces, ensuring that the connection strength meets the usage requirements of the building frame. The specific structural combination is as follows: 1. Rigid embedding and limiting, improving connection tightness: After the crossbeam assembly 4 is adjusted into place, the end of the U-shaped frame 406 of the extension frame is inserted into the slot 604 on the inner wall of the longitudinal beam 603. At the same time, the upper and lower sets of locking blocks 407 on the U-shaped frame 406 are embedded into the through groove 605 of the longitudinal beam 603, forming a two-way embedding and limiting structure. The slot 604 restricts the front-to-back and vertical displacement of the U-shaped frame 406, and the through groove 605 restricts the left-to-right and vertical displacement of the locking blocks 407. The two work together to effectively prevent the end of the crossbeam assembly 4 from moving, twisting or warping within the bracket 6, greatly improving the connection tightness between the crossbeam assembly 4 and the bracket 6, and providing a basic guarantee for the connection strength.

[0032] 2. Tensioner self-locking mechanism enhances length fixation and connection rigidity: After the long bolt 5 passes through the longitudinal beam 603 and the plug seat 408, it is screwed to the internal threaded cylinder 411 of the tensioner. When the long bolt 5 is tightened, the internal threaded cylinder 411 will be pulled to move along the vertical limiting groove 410 of the plug seat 408, while compressing the spring 414 in the reserved hole 413. During the displacement of the internal threaded cylinder 411, the limiting ramp block 412 fixed at its inner end squeezes the elastic teeth 409 distributed vertically in the vertical limiting groove 410, causing the elastic teeth 409 to open and tightly abut against the inner wall of the reserved inner groove 403 of the intermediate I-beam 401, forming a mechanical self-locking mechanism. This self-locking structure can not only accurately lock the adjusted length of the crossbeam assembly 4 to prevent it from stretching or deforming during use, but also enhance the connection rigidity between the extension frame and the intermediate I-beam 401 through the tight contact between the elastic teeth 409 and the reserved inner groove 403, thereby improving the overall connection strength between the crossbeam assembly 4 and the bracket 6.

[0033] 3. Synergistic Locking and Distributed Stress Enhancement for Improved Stability: The single-point locking of the long bolt 5 achieves a multi-linkage effect. While locking the length of the crossbeam assembly 4, it simultaneously pushes the buckle seat 405 at the top of the extension frame into the buckle groove 201 at the lower end of the top connecting seat 2, ensuring a secure fit between the top of the crossbeam assembly 4 and the top connecting seat 2. The two ends of the top connecting seat 2 are rigidly fixed to the columns 601 of the support 6 via end fasteners 1, forming an integrated force-bearing system of "support 6, top connecting seat 2, and crossbeam assembly 4." This evenly distributes the load borne by the crossbeam assembly 4 to the support 6, avoiding localized stress concentration and further strengthening the connection between the crossbeam assembly 4 and the support 6. This ensures that the crossbeam assembly 4 can stably bear the load after adjustment, meeting the requirements for large spans and high loads.

[0034] 4. Optimized structural layout to ensure balanced force distribution: The plug-in base 408 is embedded in the reserved inner groove 403, providing a stable mounting base for the tensioning component and ensuring that the locking force of the tensioning component can be evenly transmitted to the extension frame and the intermediate I-beam 401; the sliding engagement between the U-shaped frame 406 and the slide groove 402 not only limits the sliding trajectory, but also increases the contact area between the extension frame and the intermediate I-beam 401, dispersing the force and preventing the adjustment part from breaking or deforming due to concentrated force, further ensuring the connection strength and service life of the crossbeam assembly 4 and the bracket 6 after adjustment.

[0035] Specifically, when using it: This prefabricated steel structure building frame is mainly composed of end fasteners 1, top connecting seats 2, screws 3, crossbeam components 4, long bolts 5, and brackets 6. The whole structure adopts a prefabricated plug-in, length adaptive adjustment, bolt tension self-locking, and multi-part snap-fit ​​installation prefabricated structure form, and is equipped with special construction steps to achieve rapid assembly.

[0036] The bracket 6 consists of two sets of columns 601 and longitudinal beams 603. First, insert both ends of the longitudinal beams 603 into the slots 602 on the inner side of the upper end of the columns 601 (and then use screws to lock and fix them), thus completing the overall pre-assembly and shaping of the bracket 6.

[0037] Multiple sets of adjustable-length crossbeam assemblies 4 are inserted between the left and right sets of brackets 6 at both ends. The crossbeam assembly 4 consists of a middle I-beam 401 and extension frames that can slide at both ends. The socket frame 404 of the extension frame can slide along the outside of the middle I-beam 401, and the U-shaped frame 406 slides along the groove 402 of the middle I-beam 401, thereby adapting to different installation spans and realizing free adjustment of the overall length of the crossbeam assembly 4.

[0038] The U-shaped frame 406 is pulled out along the middle I-beam 401 to both ends. At this time, the U-shaped frame 406 slides along the slide groove 402, and the plug-in seat 408 slides along the reserved inner groove 403 until the snap-fit ​​block 407 fixed at the end of the U-shaped frame 406 is inserted into the corresponding through groove 605 on the longitudinal beam 603, forming a pre-installation between the crossbeam assembly 4 and the left and right sets of brackets 6.

[0039] The end of the U-shaped frame 406 is directly inserted into the slot 604, and the snap-fit ​​block 407 is embedded in the through slot 605, realizing plug-in pre-positioning. There is no need to calibrate the hole positions one by one, and the pre-assembly and overlap of the beam assembly 4 and the bracket 6 can be completed quickly.

[0040] The end fastener 1 is fixed to the outer sides of both ends of the top connecting seat 2 through its own socket 102 (it can also be locked with screws). The top connecting seat 2 is then mounted on the top center of the multiple beam assemblies 4. The inner plate 103 and outer plate 104 of the end seat 101 of the end fastener 1 are fixed to the inner and outer sides of the top of the column 601 by screws 3, respectively, to complete the rigid fixation of the top connecting seat 2 and the bracket 6.

[0041] During assembly and locking, the long bolts 5 pass through the longitudinal beam 603 of the bracket 6 and the plug seat 408 of the crossbeam assembly 4 at equal intervals, and finally screw the internal threaded cylinder 411 of the tensioning member. During the tightening of the long bolt 5, the internal threaded cylinder 411 is displaced, compressing the spring 414, which in turn causes the limiting ramp block 412 to press the elastic teeth 409 in the vertical limiting groove 410. The inner end of the elastic teeth 409 slides along the surface of the limiting ramp block 412, so that the upper and lower sets of elastic teeth 409 open and abut against the inner wall of the reserved inner groove 403, forming a tension limit.

[0042] The timing is such that the buckle seat 405 at the top of the extension frame snaps into the buckle groove 201 at the lower end of the top connecting seat 2, the end of the U-shaped frame 406 is inserted into the slot 604 on the inner wall of the longitudinal beam 603, and the snap-fit ​​block 407 is embedded in the through groove 605 of the longitudinal beam 603. Relying on the elastic locking and mechanical limiting of the tensioning components, the adjusted length of the crossbeam assembly 4 is locked, and the bracket 6, crossbeam assembly 4, and top connecting seat 2 are locked and fixed in an integrated manner, thus completing the overall assembly of the building frame.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated assembled steel structure building frame, comprising two sets of supports arranged parallel to each other on the left and right, characterized in that: Several sets of crossbeam assemblies are fixed between the two sets of brackets at equal intervals front and back using long bolts. A top connecting seat is connected to the top of the several sets of crossbeam assemblies in the center. The end fasteners at both ends of the top connecting seat are fixed to the bracket. The length of the crossbeam assembly is adjustable. Both ends of the crossbeam assembly are inserted into the bracket. After the long bolts are locked with the tensioning member inside the crossbeam assembly, the middle of the upper end of the crossbeam assembly is snapped into the bottom of the top connecting seat. At the same time, the tensioning member locks the length of the crossbeam assembly.

2. The prefabricated assembled steel structure building frame according to claim 1, characterized in that: The support structure includes two sets of columns, one at the front and one at the back, and longitudinal beams fixed to the top of the two sets of columns.

3. A prefabricated assembled steel structure building frame according to claim 2, characterized in that: The upper inner side of the column is provided with a slot, and both ends of the longitudinal beam are inserted into the corresponding slots.

4. A prefabricated assembled steel structure building frame according to claim 2, characterized in that: The end fastener includes end seats fixed at both ends of the top connecting seat, inner side plates symmetrically arranged on both sides of one end of the end seat, and outer side plates symmetrically arranged on both sides of the other end of the end seat. The outer and inner side plates are fixed to the inner and outer sides of the top of the column with screws, respectively.

5. A prefabricated assembled steel structure building frame according to claim 4, characterized in that: The inner side of the end seat is provided with a sleeve groove that is sleeved and fixed to the outer sides of both ends of the top connecting seat.

6. A prefabricated assembled steel structure building frame according to claim 2, characterized in that: The crossbeam assembly includes a central I-beam and extension frames that slide at both ends of the central I-beam. The extension frame includes a socket frame fitted on the outside of the middle I-beam, a buckle seat fixed at the top of the socket frame, and two sets of upper and lower buckle blocks fixed on one side of the socket frame by a U-shaped frame. The lower end of the top connecting seat is provided with a buckle groove, the buckle seat is snapped into the buckle groove, the inner wall of the longitudinal beam is provided with a slot, the end of the U-shaped frame is inserted into the corresponding slot, and the longitudinal beam is also provided with a through groove, the snap-fit ​​block is inserted into the corresponding through groove.

7. A prefabricated assembled steel structure building frame according to claim 6, characterized in that: The upper and lower ends of the intermediate I-beam are provided with sliding grooves, and the U-shaped frame slides in the sliding grooves; The U-shaped frame is equipped with a plug-in seat, which is inserted into the reserved inner grooves at both ends of the middle I-beam; The connector has a pre-drilled hole inside and a vertical limiting groove on its inner side. The tensioning component includes a spring installed in a pre-drilled hole, an internally threaded cylinder inserted into a vertical limiting groove, a limiting ramp block fixed to the inner end of the internally threaded cylinder, and elastic teeth distributed vertically within the vertical limiting groove. The inner end of the elastic tooth abuts against the surface of the limiting ramp block, and the other end of the spring is fixed to one end of the internal threaded cylinder; The long bolt passes through the longitudinal beam and the plug-in seat and is then screwed into the internal threaded cylinder.

8. A construction method for a prefabricated assembled steel structure building frame according to any one of claims 1-7, characterized in that: Specifically, the following steps are included: S1. Insert both ends of the crossbeam assembly into the bracket; S2. Fix the end fasteners to both ends of the top connector, and place the top connectors at the upper middle of several sets of crossbeam assemblies, and then fix the end fasteners to the bracket. S3. After the long bolt passes through the bracket, it locks with the tensioning member inside the crossbeam assembly. The middle of the upper end of the crossbeam assembly is snapped into the bottom of the top connecting seat. At the same time, the tensioning member locks the length of the crossbeam assembly.

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