A connection structure between square tube columns and beams

Abstract

This utility model discloses a connection structure between a square tube column and a beam, relating to the field of beam-column connection technology. It includes a square tube column, a square tube column connection assembly, a central connection assembly, and a beam fixing assembly. A square tube column connection assembly is installed on the outer side of the square tube column; a central connection assembly is installed on the outer side of the square tube column connection assembly; and a beam fixing assembly is installed on the outer side of the central connection assembly. The square tube column connection assembly includes a C-shaped connecting block, a dovetail slide bar, a C-shaped connecting block, a dovetail groove, a dovetail groove, and a threaded fixing hole. Two dovetail slide bars are fixedly connected to the rear left and right ends of the C-shaped connecting block, and two dovetail grooves are opened on the front left and right ends of the C-shaped connecting block. This connection structure between the square tube column and the beam can reduce repeated adjustment procedures during connection and improve the versatility of the connecting beam to meet diverse scenario requirements.

Description

Technical Field

[0001] This utility model relates to the field of beam-column connection technology, specifically a connection structure between a square tube column and a beam. Background Technology

[0002] Small power plant boilers, such as waste heat recovery boilers, have a small overall structural load and a low height, which allows for a smaller cross-section of the steel frame columns. To shorten the processing cycle and save manufacturing costs, the steel frame columns of such boilers will be made of prefabricated cold-formed hollow square tubes.

[0003] Among the existing technologies, the authorized announcement number CN222701181U proposes a connection structure between a square tube column and a crossbeam, which includes a vertically arranged square tube column, a number of crossbeams vertically connected to the square tube column, and a connecting plate connecting the two. It also includes an upper stiffening plate and a lower stiffening plate arranged in the horizontal direction and sleeved and fixed on the square tube column. Each crossbeam is arranged between a set of upper stiffening plates and lower stiffening plates and is fixedly connected to them.

[0004] Existing technologies lack effective pre-positioning and calibration mechanisms in traditional connection methods. Component installation requires repeated adjustments to the alignment, resulting in low assembly efficiency and difficulty in ensuring accuracy. This significantly increases installation time and labor costs. Fixed interface designs cannot adapt to beams with different cross-sections or sizes and lack stepless height adjustment capabilities, limiting the flexibility of frame construction and its adaptability to different application scenarios. Therefore, we propose a connection structure between square tube columns and beams. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a connection structure between square tube columns and crossbeams, which can greatly improve assembly efficiency, reduce repeated adjustment processes in the connection, increase the versatility of the connecting crossbeams to adapt to diverse scenario requirements, and effectively solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a connection structure between a square tube column and a crossbeam, comprising a square tube column, a square tube column connection assembly, a middle connection assembly, and a crossbeam fixing assembly;

[0007] Square tube column: A square tube column connecting assembly is installed on the outer side, a middle connecting assembly is installed on the outer side of the square tube column connecting assembly, and a crossbeam fixing assembly is installed on the outer side of the middle connecting assembly.

[0008] The square tube column connecting assembly includes a C-shaped connecting block 1, a dovetail slide bar 1, a C-shaped connecting block 2, a dovetail slide groove 1, a dovetail slide groove 2, and a threaded fixing hole 1. Two dovetail slide bars 1 are fixedly connected to the rear left and right ends of the C-shaped connecting block 1. Two dovetail slide grooves 1 are opened on the front left and right ends of the C-shaped connecting block 2. The dovetail slide grooves 1 are slidably connected to the dovetail slide bars 1. Four threaded fixing holes 1 are opened at the front end of the C-shaped connecting block 1. Four threaded fixing holes 1 are opened at the rear end of the C-shaped connecting block 2. Two dovetail slide grooves 2 are correspondingly opened at the top and bottom of the front end of the C-shaped connecting block 1. Two dovetail slide grooves 2 are correspondingly opened at the top and bottom of the rear end of the C-shaped connecting block 2. Fixing bolts pass through the threaded fixing holes 1 to fix the C-shaped connecting block 1 and the C-shaped connecting block 2 to the square tube column.

[0009] C-shaped connecting block one is slidably connected to C-shaped connecting block two via dovetail slide bar one and dovetail slide groove one; both C-shaped blocks have dovetail slide groove two and four threaded fixing holes one at their front and rear ends; fixing bolts pass through threaded fixing holes one to clamp and fix C-shaped connecting block one and C-shaped connecting block two on the outside of the square tube column. The sliding of dovetail slide bar one and dovetail slide groove one achieves precise positioning of the two C-shaped blocks. Threaded fixing holes one provide bolt locking points. The symmetrical clamping of the two C-shaped blocks enhances the stability of the column connection.

[0010] Furthermore, the middle connecting component includes a connecting block, a dovetail slide bar II, and a threaded fixing hole III. The dovetail slide bar II is fixedly connected to the upper and lower ends of the inner side of the connecting block, and two threaded fixing holes III are respectively opened at the front and rear ends of the connecting block. The dovetail slide bar II on the rear side of the inner side of the connecting block is slidably connected to the dovetail slide groove II of the C-shaped connecting block II. The dovetail slide bar II on the front side of the inner side of the connecting block is slidably connected to the dovetail slide groove II of the C-shaped connecting block I. The C-shaped connecting block I and C-shaped connecting block II are slidably connected to two connecting blocks on the left and right sides respectively through the dovetail slide groove II. The two connecting blocks are fixedly connected by threaded fixing holes III and fixing bolts.

[0011] The dovetail-shaped slide bar 2 on the inner side of the connecting block is slidably connected to the dovetail-shaped slide groove 2 of the C-type connecting block 1 and the C-type connecting block 2 respectively; the two connecting blocks are fixed by the threaded fixing hole 3 and bolts. The dovetail-shaped slide bar 2 slides along the slide groove 2 to adjust the connecting block to accurately position and fix its position. The bolts pass through the threaded fixing hole 3 to lock the two connecting blocks. The dovetail structure ensures accurate vertical positioning and enables quick disassembly. At the same time, it can still accurately fix its position when there are no bolts for reinforcement.

[0012] Furthermore, the middle connecting component also includes a rectangular limiting groove and four threaded fixing holes. Two rectangular limiting grooves are opened on the inner side of the connecting block, and four threaded fixing holes are opened at the upper and lower ends of the connecting block, respectively.

[0013] Two rectangular limiting grooves are opened on the inner side of the connecting block, and four threaded fixing holes are opened at the upper and lower ends. The rectangular limiting grooves provide a positioning reference for the crossbeam assembly, and the four threaded fixing holes are used to connect subsequent components. The rectangular limiting grooves prevent lateral displacement; the four threaded holes expand the connection interface; and the load-bearing structure of the middle component is strengthened.

[0014] Furthermore, the crossbeam fixing assembly includes a square crossbeam, a connecting fixing block, a rectangular limiting strip, a threaded fixing hole six, and a circular crossbeam. The inner side of the square crossbeam has a rectangular mounting groove, and the inner side of the circular crossbeam has a semi-circular mounting groove. The upper and lower ends of the outer sides of the square and circular crossbeams are fixedly connected to two connecting fixing blocks. The outer side of the connecting fixing block is fixedly connected to a rectangular limiting strip. The right rectangular limiting groove is slidably connected to two rectangular limiting strips. The inner side of the connecting fixing block has a threaded fixing hole six. The fixing bolt passes through the threaded fixing hole four and the threaded fixing hole six to fix the connecting block and the connecting fixing block. Both square and round crossbeams are secured with rectangular limiting strips via connecting fixing blocks. The rectangular limiting strips are embedded in the rectangular limiting grooves of the connecting blocks, and bolts pass through threaded fixing holes four and six of the connecting fixing blocks for fixation. The rectangular limiting strips and limiting grooves work together to prevent misalignment, and the bolt connection between threaded holes four and six achieves rigid fixation. The fit between the limiting strips and grooves ensures installation accuracy. The double crossbeam type adapts to different needs, and the bolt connection ensures torsional strength.

[0015] Furthermore, the crossbeam fixing assembly also includes crossbeam fixing strips, threaded fixing holes seven and eight. Two crossbeam fixing strips are fixedly connected to the square and round crossbeam pieces. The two corresponding crossbeam fixing strips are fixedly connected via threaded fixing holes seven and fixing bolts. Two threaded fixing holes eight are opened on the inner sides of the square and round crossbeam pieces. The square and round crossbeam pieces are connected by two crossbeam fixing strips, and bolts are used to lock them through the threaded fixing holes seven. The threaded fixing holes eight are opened on the inner sides of the crossbeam pieces. The crossbeam fixing strips clamp the two halves of the crossbeam pieces, and the threaded fixing holes eight directly fix the crossbeam body. The fixing strips enhance the structural integrity of the crossbeam pieces, the threaded holes seven enable modular assembly, and the threaded holes eight provide direct anchor points for fixing the crossbeam.

[0016] Furthermore, it also includes a square beam and a round beam. The square beam is fixedly connected to the square beam through threaded fixing holes eight and fixing bolts, and the round beam is fixedly connected to the round beam through threaded fixing holes eight and fixing bolts.

[0017] The square beam is fixed to the square beam component by threaded fixing holes eight and bolts; the round beam is fixed to the round beam component by threaded fixing holes eight and bolts. The bolts pass through the threaded fixing holes eight on the inside of the beam component and tighten against the surface of the beam to achieve fixation. The universal threaded holes eight are compatible with both types of beams, and the detachable design facilitates maintenance and replacement.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: The connection structure between this square tube column and the crossbeam has the following advantages:

[0019] 1. The connection structure between the square tube column and the crossbeam uses a double-layer dovetail slide structure to achieve tool-free pre-positioning of multi-level components: the C-shaped connecting block is quickly assembled and locked into the column through the dovetail guide rail, the connecting block slides and calibrates along the vertical dovetail groove, and the rectangular limit strip cooperates with the groove to ensure the installation deviation of the crossbeam. This design ensures that each component is precisely aligned before the bolts are tightened, which greatly improves the assembly efficiency and completely eliminates the repeated adjustment process in traditional connections.

[0020] 2. The connection structure between the square tube column and the crossbeam features a crossbeam fixing component with both square and round dual-mode interfaces. The universal threaded hole design is compatible with crossbeams of different cross sections. The dovetail groove layout supports stepless height adjustment of the connecting block, and the standardized rectangular limit groove interface facilitates the expansion of brackets or equipment. From the construction of the basic frame to the addition of functional accessories, the structure adapts to diverse scenario requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This utility model Figure 1 A magnified view of the structure at point A in the middle;

[0023] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0024] In the diagram: 1. Square tube column, 2. Square beam, 3. Square tube column connecting assembly, 31. C-shaped connecting block I, 32. Dovetail slide bar I, 33. C-shaped connecting block II, 34. Dovetail slide groove I, 35. Dovetail slide groove II, 36. Threaded fixing hole I, 4. Middle connecting assembly, 41. Connecting block, 42. Dovetail slide bar II, 43. Threaded fixing hole III, 44. Rectangular limiting groove, 45. Threaded fixing hole IV, 5. Beam fixing assembly, 51. Square beam component, 52. Connecting fixing block, 53. Rectangular limiting strip, 54. Threaded fixing hole VI, 55. Beam assembly fixing strip, 56. Threaded fixing hole VII, 57. Threaded fixing hole VIII, 58. Circular beam component, 6. Circular beam. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-3 This embodiment provides a technical solution: a connection structure between a square tube column and a crossbeam, including a square tube column 1, a square tube column connecting component 3, a middle connecting component 4, and a crossbeam fixing component 5;

[0027] Square tube column 1: A square tube column connecting component 3 is installed on the outside, a middle connecting component 4 is installed on the outside of the square tube column connecting component 3, and a crossbeam fixing component 5 is installed on the outside of the middle connecting component 4.

[0028] The square tube column connecting assembly 3 includes a C-shaped connecting block 1 31, a dovetail slide bar 1 32, a C-shaped connecting block 2 33, a dovetail slide groove 1 34, a dovetail slide groove 2 35, and a threaded fixing hole 1 36. Two dovetail slide bars 1 32 are fixedly connected to the left and right ends of the rear side of the C-shaped connecting block 1 31. Two dovetail slide grooves 1 34 are opened on the front left and right ends of the front side of the C-shaped connecting block 2 33. The dovetail slide grooves 1 34 are slidably connected to the dovetail slide bars 1 32. Four threaded fixing holes 1 36 are opened at the front end of the C-shaped connecting block 1 31. Four threaded fixing holes 1 36 are opened at the rear end of the C-shaped connecting block 2 33. Two dovetail slide grooves 2 35 are opened at the top and bottom of the front end of the C-shaped connecting block 1 31. Two dovetail slide grooves 2 35 are opened at the top and bottom of the rear end of the C-shaped connecting block 2 33. Fixing bolts pass through the threaded fixing holes 1 36 to fix the C-shaped connecting block 1 31 and the C-shaped connecting block 2 33 to the square tube column 1.

[0029] C-type connecting block 1 31 is slidably connected to C-type connecting block 2 33 via dovetail slide bar 1 32 and dovetail slide groove 1 34. Both C-type blocks have dovetail slide groove 2 35 and four threaded fixing holes 1 36 at their front and rear ends. The fixing bolts pass through the threaded fixing holes 1 36 to clamp and fix C-type connecting block 1 31 and C-type connecting block 2 33 on the outside of the square tube column 1. The sliding of dovetail slide bar 1 32 and dovetail slide groove 1 34 achieves precise positioning of the two C-type blocks. The threaded fixing holes 1 36 provide bolt locking points. The symmetrical clamping of the two C-type blocks enhances the stability of the column connection.

[0030] The middle connecting component 4 includes a connecting block 41, a dovetail slide bar 2 42, and a threaded fixing hole 3 43. The dovetail slide bar 2 42 is fixedly connected to the upper and lower ends of the inner side of the connecting block 41. Two threaded fixing holes 3 43 are opened at the front and rear ends of the connecting block 41 respectively. The dovetail slide bar 2 42 on the rear side of the inner side of the connecting block 41 is slidably connected to the dovetail slide groove 2 35 of the C-type connecting block 2 33. The dovetail slide bar 2 42 on the front side of the inner side of the connecting block 41 is slidably connected to the dovetail slide groove 2 35 of the C-type connecting block 1 31. The C-type connecting block 1 31 and the C-type connecting block 2 33 are slidably connected to two connecting blocks 41 on the left and right sides respectively through the dovetail slide groove 2 35. The two connecting blocks 41 are fixedly connected by the threaded fixing holes 3 43 and fixing bolts.

[0031] The dovetail-shaped slide bar 42 on the inner side of the connecting block 41 is slidably connected to the dovetail-shaped slide groove 35 of the C-type connecting block 31 and the C-type connecting block 33 respectively; the two connecting blocks 41 are fixed by the threaded fixing hole 33 and bolts. The dovetail-shaped slide bar 42 slides along the slide groove 35 to adjust the connecting block 41 to accurately position and fix its position. The bolts pass through the threaded fixing hole 33 to lock the two connecting blocks 41. The dovetail structure ensures accurate vertical positioning and enables quick disassembly. At the same time, it can still accurately fix its position when there are no bolts for reinforcement.

[0032] The middle connecting component 4 also includes a rectangular limiting groove 44 and a threaded fixing hole 45. Two rectangular limiting grooves 44 are opened on the inner side of the connecting block 41, and threaded fixing holes 45 are opened on the upper and lower ends of the connecting block 41.

[0033] Two rectangular limiting grooves 44 are opened on the inner side of the connecting block 41, and threaded fixing holes 45 are opened at the upper and lower ends. The rectangular limiting grooves 44 provide a positioning reference for the crossbeam assembly, and the threaded fixing holes 45 are used to connect subsequent components. The rectangular limiting grooves 44 prevent lateral displacement; the threaded holes 45 expand the connection interface; and strengthen the load-bearing structure of the middle component.

[0034] The crossbeam fixing assembly 5 includes a square crossbeam 51, a connecting fixing block 52, a rectangular limiting strip 53, a threaded fixing hole 54, and a circular crossbeam 58. The inner side of the square crossbeam 51 has a rectangular mounting groove, and the inner side of the circular crossbeam 58 has a semi-circular mounting groove. The upper and lower ends of the outer sides of the square crossbeam 51 and the circular crossbeam 58 are fixedly connected to two connecting fixing blocks 52. The outer side of the connecting fixing block 52 is fixedly connected to a rectangular limiting strip 53. The right rectangular limiting groove 44 is slidably connected to two rectangular limiting strips 53. The inner side of the connecting fixing block 52 has a threaded fixing hole 54. The fixing bolt passes through the threaded fixing hole 45 and the threaded fixing hole 54 to fix the connecting block 41 and the connecting fixing block 52. Both the square beam component 51 and the round beam component 58 are fixed with rectangular limiting strips 53 by connecting fixing blocks 52; the rectangular limiting strips 53 are embedded in the rectangular limiting grooves 44 of the connecting block 41, and bolts are used to fix them through threaded fixing holes 45 and 54 of the connecting fixing block 52. The rectangular limiting strips 53 and the limiting grooves 44 cooperate to prevent misalignment, and the bolt connection between the threaded holes 45 and 54 achieves rigid fixation. The matching of the limiting strips and the grooves ensures installation accuracy. The double beam type is suitable for different needs, and the bolt connection ensures torsional strength.

[0035] The crossbeam fixing assembly 5 also includes a crossbeam fixing strip 55, a threaded fixing hole 7 56, and a threaded fixing hole 8 57. Two crossbeam fixing strips 55 are fixedly connected to the square crossbeam 51 and the round crossbeam 58. The two corresponding crossbeam fixing strips 55 are fixedly connected by threaded fixing holes 7 56 and fixing bolts. Two threaded fixing holes 8 57 are opened on the inner side of the square crossbeam 51 and the round crossbeam 58. The square crossbeam 51 and the round crossbeam 58 are connected by two crossbeam fixing strips 55, and bolts are used to lock them through threaded fixing holes 7 56. Threaded fixing holes 8 57 are opened on the inner side of the crossbeam, the crossbeam fixing strips 55 clamp the two halves of the crossbeam, and the threaded fixing holes 8 57 directly fix the crossbeam body. The fixing strips 55 enhance the structural integrity of the crossbeam, the threaded holes 7 56 enable modular assembly, and the threaded holes 8 57 provide direct anchor points for fixing the crossbeam.

[0036] It also includes a square beam 2 and a round beam 6. The square beam 51 is fixedly connected to the square beam 2 through threaded fixing holes 8 57 and fixing bolts, and the round beam 58 is fixedly connected to the round beam 6 through threaded fixing holes 8 57 and fixing bolts.

[0037] The square beam 2 is fixed to the square beam component 51 through the threaded fixing hole 8 57 and bolts; the round beam 6 is fixed to the round beam component 58 through the threaded fixing hole 8 57 and bolts. The bolts pass through the threaded fixing hole 8 57 on the inner side of the beam component and tighten against the surface of the beam to achieve fixation. The universal threaded hole 8 57 is suitable for both types of beams, and the detachable design facilitates maintenance and replacement.

[0038] The working principle of the connection structure between the square tube column and the crossbeam provided by this utility model is as follows: First, the C-shaped connecting block 31 and the C-shaped connecting block 33 of the square tube column connecting assembly 3 are slidably assembled with the dovetail slide bar 32 and the dovetail slide groove 34, and locked to the outside of the square tube column 1 with a fixing bolt through the threaded fixing hole 36; then, the connecting block 41 of the middle connecting assembly 4 is slidably positioned along the dovetail slide groove 35 of the C-shaped connecting block 31 and the C-shaped connecting block 33 through the inner dovetail slide bar 42, and the left and right connecting blocks are fixed with bolts through the threaded fixing hole 343. Block 41; then the rectangular limiting strip 53 on the outer side of the connecting fixing block 52 of the square beam 51 or round beam 58 of the beam fixing assembly 5 is embedded into the rectangular limiting groove 44 of the connecting block 41, and fixed by bolts through threaded fixing hole four 45 and threaded fixing hole six 54; finally, the square beam 2 or round beam 6 is inserted into the corresponding beam inner mounting groove, and fixed by bolts through threaded fixing hole eight 57; the beams are reinforced by the beam assembly fixing strip 55 and threaded fixing hole seven 56 bolts, and the entire process is precisely positioned by the dovetail sliding structure, and the bolt locking realizes modular and stable assembly.

[0039] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A connection structure between a square tube column and a crossbeam, characterized in that: It includes a square tube column (1), a square tube column connecting assembly (3), a middle connecting assembly (4), and a crossbeam fixing assembly (5); Square tube column (1): A square tube column connecting component (3) is installed on the outside of the square tube column connecting component (3), a middle connecting component (4) is installed on the outside of the square tube column connecting component (3), and a crossbeam fixing component (5) is installed on the outside of the middle connecting component (4). Square tube column connecting assembly (3): includes C-shaped connecting block one (31), dovetail slide bar one (32), C-shaped connecting block two (33), dovetail slide groove one (34), dovetail slide groove two (35) and threaded fixing hole one (36). The rear left and right ends of the C-shaped connecting block one (31) are fixedly connected to two dovetail slide bars one (32). The front left and right ends of the C-shaped connecting block two (33) are provided with two dovetail slide grooves one (34). The dovetail slide groove one (34) is slidably connected to the dovetail slide bar one (32). The front end of the C-type connecting block 1 (31) is provided with four threaded fixing holes 1 (36), and the rear end of the C-type connecting block 2 (33) is provided with four threaded fixing holes 1 (36). The front end of the C-type connecting block 1 (31) is provided with two dovetail grooves 2 (35) corresponding to the top and bottom. The rear end of the C-type connecting block 2 (33) is provided with two dovetail grooves 2 (35) corresponding to the top and bottom. The fixing bolt passes through the threaded fixing holes 1 (36) to fix the C-type connecting block 1 (31) and C-type connecting block 2 (33) to the square tube column (1).

2. The connection structure between a square tube column and a crossbeam according to claim 1, characterized in that: The middle connecting component (4) includes a connecting block (41), a dovetail slide bar II (42), and a threaded fixing hole III (43). The upper and lower ends of the inner side of the connecting block (41) are fixedly connected with the dovetail slide bar II (42) in front and back respectively. The front and back ends of the connecting block (41) are respectively provided with two threaded fixing holes III (43). The dovetail slide bar II (42) on the rear side of the inner side of the connecting block (41) is slidably connected with the dovetail slide groove II (35) of the C-type connecting block II (33). The dovetail slide bar II (42) on the front side of the inner side of the connecting block (41) is slidably connected with the dovetail slide groove II (35) of the C-type connecting block I (31). The C-type connecting block I (31) and C-type connecting block II (33) are two connecting blocks (41) slidably connected on the left and right sides respectively through the dovetail slide groove II (35). The two connecting blocks (41) are fixedly connected by the threaded fixing hole III (43) and the fixing bolt.

3. The connection structure between a square tube column and a crossbeam according to claim 2, characterized in that: The middle connecting component (4) also includes a rectangular limiting groove (44) and a threaded fixing hole four (45). The inner side of the connecting block (41) has two rectangular limiting grooves (44) corresponding to the upper and lower sides, and the upper and lower ends of the connecting block (41) are provided with threaded fixing holes four (45) corresponding to the front and back.

4. The connection structure between a square tube column and a crossbeam according to claim 1, characterized in that: The crossbeam fixing assembly (5) includes a square crossbeam (51), a connecting fixing block (52), a rectangular limiting strip (53), a threaded fixing hole six (54), and a circular crossbeam (58). The inner side of the square crossbeam (51) has a rectangular mounting groove, and the inner side of the circular crossbeam (58) has a semi-circular mounting groove. The upper and lower ends of the outer sides of the square crossbeam (51) and the circular crossbeam (58) are fixedly connected to two connecting fixing blocks (52). The outer side of the connecting fixing block (52) is fixedly connected to a rectangular limiting strip (53). The right rectangular limiting groove (44) is slidably connected to two rectangular limiting strips (53). The inner side of the connecting fixing block (52) has a threaded fixing hole six (54). The fixing bolt passes through the threaded fixing hole four (45) and the threaded fixing hole six (54) to fix the connecting block (41) and the connecting fixing block (52).

5. The connection structure between a square tube column and a crossbeam according to claim 4, characterized in that: The beam fixing assembly (5) also includes a beam fixing strip (55), a threaded fixing hole seven (56) and a threaded fixing hole eight (57). The square beam piece (51) and the round beam piece (58) are fixedly connected to two beam fixing strips (55). The two corresponding beam fixing strips (55) are fixedly connected by threaded fixing holes seven (56) and fixing bolts. The square beam piece (51) and the round beam piece (58) have two threaded fixing holes eight (57) on their inner sides.

6. The connection structure between a square tube column and a crossbeam according to claim 5, characterized in that: It also includes a square beam (2) and a round beam (6). The square beam (51) is fixedly connected to the square beam (2) through threaded fixing hole eight (57) and fixing bolts. The round beam (58) is fixedly connected to the round beam (6) through threaded fixing hole eight (57) and fixing bolts.

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