A combined lifting device for main and secondary beams of a steel structure

Abstract

This utility model discloses a combined lifting device for main and secondary steel beams. It lifts main and secondary beams by mounting them on several columns. The device includes several connecting brackets and lifting lugs. Each column has at least one lifting lug at its upper end. A column is located at each of the four vertices of a U-shaped structure. Two adjacent lifting lugs are used to lift the two ends of a main beam. The upper ends of two opposing connecting brackets are connected to the two ends of a secondary beam. The two main beams are lifted simultaneously. Two connecting brackets are spaced apart on one main beam. The secondary beams are located between the two main beams and perpendicular to them. The two ends of each secondary beam are connected to the two opposing main beams via connecting brackets. The lower ends of the connecting brackets have horizontally aligned first and second slots, allowing the two sides of one end of the main beam to be inserted into the first and second slots respectively. This combined lifting device for main and secondary steel beams can simultaneously lift main and secondary steel beams within a limited space, improving construction efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of construction technology, specifically relating to a combined lifting device for main and secondary beams of steel structures. Background Technology

[0002] Currently, steel beam lifting and installation mainly employs two types of technologies: one is the hoisting technology using large lifting equipment, which uses tower cranes, truck cranes, and other equipment to assemble the steel beams on the ground, and then uses hooks and wire ropes to hoist them to the installation position, where they are fixed by bolts or welding. This is commonly used for construction in open areas. The other is the scaffolding or full-span support system-assisted installation technology, which involves building a support structure composed of steel pipes and fasteners under the steel beams. Construction workers then use manual labor or small lifting equipment to assist in the splicing, adjustment, and fixing of the steel beams. This is suitable for scenarios with limited space or high precision requirements.

[0003] There are three major problems with the hoisting technology of large lifting equipment: First, the costs of equipment rental, transportation and labor are high; second, it requires a high degree of openness and flatness of the site, and it is difficult to operate in complex environments such as densely populated urban areas and underground spaces; third, the operation is risky, and safety accidents can easily be caused by bad weather or equipment failure. This is mainly due to the large size of the equipment, the complexity of operation and the high cost of purchase and maintenance.

[0004] The scaffolding or full-span support system-assisted installation technology also has obvious drawbacks, such as: long erection and dismantling time, large investment of manpower and materials, which seriously affects construction efficiency; the stability of the support system is easily affected by various factors, and human operation can also produce errors, making it difficult to guarantee the installation accuracy of steel beams; at the same time, the support system is prone to collapse if it is not erected in a standardized manner or is overloaded, and there is insufficient safety protection for high-altitude operations, which poses a risk of falling. The root cause lies in its temporary structural characteristics and dependence on manual operation.

[0005] In conclusion, neither of the above two techniques is conducive to the lifting and installation of steel beams, and it is obviously difficult to lift the main steel beams and secondary steel beams simultaneously.

[0006] Therefore, a new technology is needed to solve the problem of the inconvenience of simultaneously lifting the main beam and secondary beam in a confined space in existing technologies. Utility Model Content

[0007] To address the aforementioned problems in the prior art, this utility model provides a combined lifting device for main and secondary beams of steel structures. It has a simple structure, is easy to use in confined spaces, is easy to operate, and facilitates the lifting and installation of steel beams during construction. It can lift the main beams and secondary beams simultaneously.

[0008] The present invention adopts the following technical solution: A steel structure main and secondary beam joint lifting device is provided, which lifts the main beam and secondary beam by being installed on several columns. It includes several connecting brackets and at least four lifting lugs. Each column is equipped with at least one lifting lug at its upper end. The columns are arranged to form at least one U-shape. A column is provided at each of the four vertices of the U-shape. The four columns arranged to form the U-shape are designated as the first column, the second column, the third column, and the fourth column. Two adjacent lifting lugs are used to lift the two ends of a main beam, and the upper ends of two oppositely arranged connecting brackets are used to connect the two ends of a secondary beam. The two main beams are spaced apart and parallel to each other, and the two main beams are lifted synchronously. Two connecting brackets are connected to one of the main beams at intervals. The two secondary beams are located between the two opposing main beams and are perpendicular to the main beams. The two ends of each secondary beam are connected to the two opposing main beams through a connecting bracket. The lower ends of each of the connecting brackets are provided with a first slot and a second slot that are horizontally aligned and opposite to each other, and the two sides of one end of the main beam can be respectively embedded into the first slot and the second slot.

[0009] As a further improvement to the technical solution of this utility model, the upper ends of the first column, the second column, the third column, and the fourth column are each equipped with a number of spaced-apart lifting supports. Each lifting support includes a crossbeam and a connecting rod connected sequentially from top to bottom. A support seat is provided below the connecting rod. The support seat is horizontally arranged and one end is connected to the first column. The connecting rod is vertically arranged and its lower end is detachably fixed to the upper end face of the support seat. The upper end of the connecting rod is detachably fixed to the bottom surface of the crossbeam. The crossbeam is horizontally arranged and one end is detachably fixed to the first column. The horizontal length of the crossbeam is greater than the horizontal length of the support seat. The lifting lug is installed on the lower end face of the crossbeam and is located on the side of the connecting rod away from the first column.

[0010] As a further improvement to the technical solution of this utility model, the first column, the second column, the third column, and the fourth column are all steel structure columns, and the horizontal cross section is square. Each of the four sides of the upper end of the steel structure column is equipped with a hoisting support.

[0011] As a further improvement to the technical solution of this utility model, the support base includes a first support plate, a second support plate, and a third support plate in an I-shape, which are fixedly connected from top to bottom. The first support plate and the third support plate are both horizontally arranged and one end is fixedly connected to the side of the first column. The second support plate is vertically arranged and its upper and lower ends are fixedly connected to the middle of the first support plate and the third support plate, respectively. One end of the second support plate in the horizontal direction is fixedly connected to the side of the first column. The lower end of the connecting rod is detachably fixed to the first support plate.

[0012] As a further improvement to the technical solution of this utility model, the connecting rod includes a first plate, a second plate, and a third plate arranged in parallel and at intervals. The upper ends of the first plate, the second plate, and the third plate are all fixedly connected to the crossbeam, and the lower ends are all detachably fixedly connected to the first support plate. The first plate and the third plate are arranged in parallel and at intervals, and the left and right ends of the second plate are fixedly connected to the middle of the first plate and the third plate, respectively.

[0013] As a further improvement to the technical solution of this utility model, the crossbeam includes a first connecting plate, a second connecting plate, and a third connecting plate connected in an I-shape from top to bottom. The first connecting plate and the third connecting plate are both horizontally arranged and one end is detachably fixedly connected to the side of the first column. The second connecting plate is vertically arranged and its upper and lower ends are respectively fixedly connected to the middle of the first connecting plate and the third connecting plate. One end of the second connecting plate in the horizontal direction is detachably fixedly connected to the side of the first column. The lifting lug is installed on the bottom surface of the third connecting plate.

[0014] As a further improvement to the technical solution of this utility model, the connecting bracket includes a frame body, on both sides of the upper end of the frame body, horizontally protruding lifting rings are provided, and at least two spaced diagonal braces are fixed to the lower end of each lifting ring. The upper end of each diagonal brace is fixedly connected to the lifting ring, and the lower end is fixedly connected to the frame body. The first card slot and the second card slot are located at the lower end of the frame body.

[0015] As a further improvement to the technical solution of this utility model, the horizontal cross-section of the lifting ring is rectangular, and the upper ends of the two diagonal braces are respectively connected to two adjacent vertices on the lifting ring.

[0016] As a further improvement to the technical solution of this utility model, at least one first connecting block and a second connecting block corresponding to each of the first connecting blocks are detachably installed at the lower end of the frame body. The first connecting block and the second connecting block are both U-shaped and are arranged opposite to each other. The openings on the first connecting block and the second connecting block are arranged opposite to each other. The first slot is located on each of the first connecting blocks and the second slot is located on each of the second connecting blocks.

[0017] As a further improvement to the technical solution of this utility model, the lower end of the frame body is provided with a tie rod corresponding to each of the first connecting blocks and each of the second connecting blocks, and the upper end of each of the first connecting blocks and each of the second connecting blocks is detachably fixedly connected to the lower end of the corresponding tie rod.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: The steel structure main and secondary beam combined lifting device of this scheme has a simple structure, is easy to operate, and reduces construction costs. During construction, it facilitates the lifting and installation of steel beams in confined spaces and can simultaneously hoist two main beams. The two main beams are respectively secured at both ends by four connecting brackets, and two opposite connecting brackets are connected to a secondary beam, which can simultaneously connect two secondary beams. By using the steel structure main and secondary beam combined lifting device of this scheme, the main steel beam and the secondary steel beam can be lifted simultaneously in a limited construction space, achieving the effect of "lifting both beams in one go" and improving construction efficiency. Attached Figure Description

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the column and hoisting support structure of this utility model; Figure 3 This is the main view of the column and hoisting support structure; Figure 4 This is a schematic diagram of the hoisting support structure. Figure 5 Schematic diagram of the column structure; Figure 6 This is a schematic diagram of the support structure; Figure 7 This is a schematic diagram of the beam structure; Figure 8 This is a schematic diagram of the connecting rod structure; Figure 9 This is a schematic diagram of the connecting bracket structure.

[0020] Figure label: 1-First column; 11-First positioning plate; 2-Lifting support; 21-Support base; 211-First support plate; 2111-Second positioning plate; 212-Second support plate; 213-Third support plate; 22-Connecting rod; 221-First plate; 222-Second plate; 2221-Bolt hole; 223-Third plate; 23-Crossbeam; 231-First connecting plate; 232-Second connecting plate; 233-Third connecting plate; 24-Lifting lug; 3-Connecting bracket; 31-Frame body; 32-Lifting ring; 33-First connecting block; 331-First slot; 34-Second connecting block; 341-Second slot; 35-Tie rod; 36-Diagonal brace; 4-Main beam; 5-Secondary beam. Detailed Implementation

[0021] The following will provide a clear and complete description of the concept, specific structure, and technical effects of this utility model in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0022] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this utility model are only relative to the relative positional relationships of the various components of this utility model in the accompanying drawings.

[0023] Reference Figures 1 to 9 A combined lifting device for main and secondary steel beams is disclosed. This device lifts main beam 4 and secondary beam 5 by mounting them on several columns. Both main beam 4 and secondary beam 5 are steel structure beams, designated as main steel beam and secondary steel beam, respectively. The columns can be existing structural columns on the construction site and include several connecting supports 3 and at least four lifting lugs 24. Each column is equipped with at least one lifting lug 24 at its upper end. The columns are arranged to form at least one U-shape or quadrilateral. A column is located at each of the four vertices of the U-shape or quadrilateral. The four columns forming the U-shape are designated as the first column 1, the second column, the third column, and the fourth column. The first column... 1. At least one lifting lug 24 is detachably installed on the upper end of the second column, the third column, and the fourth column. Two adjacent lifting lugs 24 are used to lift the two ends of a main beam 4, and the upper ends of two oppositely arranged connecting brackets 3 are used to connect the two ends of a secondary beam 5. The two main beams 4 are spaced apart and parallel to each other, and the two main beams 4 are lifted synchronously. Two connecting brackets 3 are connected to a main beam 4 at intervals. The two secondary beams 5 are located between the two opposite main beams 4 and perpendicular to the main beams 4. The two ends of each secondary beam 5 are connected to the two opposite main beams 4 through a connecting bracket 3.

[0024] Each of the connecting brackets 3 has a horizontally aligned first slot 331 and a second slot 341 at its lower end. The two sides of one end of the main beam 4 can be respectively inserted into the first slot 331 and the second slot 341. The lower ends of the two connecting brackets 3 between the first column 1 and the second column are detachably fixed to both ends of a main beam 4. The lower ends of the two connecting brackets 3 between the third column and the fourth column are detachably fixed to both ends of another main beam 4. Two lifting lugs installed on the first column 1 and the second column are used to lift both ends of a main beam 4, and two lifting lugs installed on the third column and the fourth column are used to lift both ends of another main beam 4. The first column 1, the second column, the third column, and the fourth column can be existing steel structure columns on the construction site.

[0025] The steel structure main and secondary beam combined lifting device of this scheme has a simple structure, which is convenient for construction in confined spaces. It can install two spaced connecting brackets 3 on one main beam 4, and four connecting brackets 3 on two main beams 4. That is, the two main beams 4 are secured by four connecting brackets 3, and the two secondary beams 5 are simultaneously connected. Using this steel structure main and secondary beam combined lifting method, the main and secondary steel beams can be lifted simultaneously within a limited construction space, improving construction efficiency. When the main beam 4 is lifted, the secondary beam 5 fixture is also lifted, which can pull the secondary beam 5 smoothly, achieving the effect of "one-time lifting, two beams in place," and is easy to operate. This steel structure main and secondary beam combined lifting device has strong spatial adaptability. The modular fixture structure connected by bolts can be installed in confined spaces without large lifting equipment, reducing construction costs. Compared with traditional hoisting techniques, it reduces site occupation and is particularly suitable for construction in densely populated urban areas and underground projects. Because the main and secondary beams were lifted simultaneously, "two beams were positioned in one lift," which effectively shortened the construction period and improved construction efficiency compared to the traditional step-by-step hoisting method.

[0026] Specifically, the upper ends of the first column 1, the second column, the third column, and the fourth column are each equipped with a plurality of spaced-apart lifting supports 2. Each lifting support 2 includes a crossbeam 23 and a connecting rod 22 connected sequentially from top to bottom. A support base 21 is provided below the connecting rod 22, and the support base 21 can be formed by the existing corbel structure on the steel structure column. The support base 21 is horizontally arranged and one end is fixedly connected to the first column 1. The connecting rod 22 is vertically arranged and its lower end is detachably fixedly connected to the upper end face of the support base 21. The upper end of the connecting rod 22 is fixedly connected to the bottom surface of the crossbeam 23. The crossbeam 23 is horizontally arranged and one end is detachably fixedly connected to the first column 1. The horizontal length of the crossbeam 23 is greater than the horizontal length of the support base 21. The lifting lug 24 is installed on the lower end face of the crossbeam 23 and is located on the side of the connecting rod 22 away from the first column 1. Among them, the lifting lug 24 can be connected to a hand chain hoist, which enables the vertical transport of the main steel beam from bottom to top.

[0027] Specifically, the first column 1, the second column, the third column, and the fourth column are all steel structure columns with a square horizontal cross-section. Each of the four sides of the upper end of the steel structure column is equipped with a hoisting support 2. At least two spaced first positioning plates 11 are fixedly connected to the top of the steel structure column for fixing the crossbeam 23. A second connecting plate 232 is located between two adjacent first positioning plates 11, and is fixedly connected to the two adjacent first positioning plates 11 by first high-strength bolts.

[0028] Specifically, the support base 21 includes a first support plate 211, a second support plate 212, and a third support plate 213, which are fixedly connected in an I-shape from top to bottom. The first support plate 211 and the third support plate 213 are both horizontally arranged and one end is fixedly connected to the side of the first column 1. The second support plate 212 is vertically arranged and its upper and lower ends are fixedly connected to the middle of the first support plate 211 and the third support plate 213, respectively. One end of the second support plate 212 in the horizontal direction is fixedly connected to the side of the first column 1. The lower end of the connecting rod 22 is fixed to the first support plate 211. The first column 1, the second column, the third column, and the fourth column can all be steel structure columns. The support base 21 can adopt the original steel bracket structure on the steel structure column. The upper end of the first support plate 211 is fixedly connected to a second positioning plate 2111. The second plate 222 is fixedly connected to the second positioning plate 2111 by a second high-strength bolt. The second plate 222 is fixedly connected to the steel bracket by the second positioning plate 2111.

[0029] Specifically, the connecting rod 22 includes a first plate 221, a second plate 222, and a third plate 223 connected horizontally in an I-shape. The upper ends of the first plate 221, the second plate 222, and the third plate 223 are all fixedly connected to the crossbeam 23, and the lower ends are all detachably fixedly connected to the first support plate 211. The first plate 221 and the third plate 223 are parallel and spaced apart. The left and right ends of the second plate 222 are fixedly connected to the middle of the first plate 221 and the third plate 223, respectively. The connecting rod 22 can be made of hot-rolled H-beam steel (HW125×125×6.5×9), with a length of 1m and material Q355B. The first plate 221 forms the left flange of the upright, the second plate 222 forms the web of the upright, and the third plate 223 forms the right flange of the upright. The lower end of the second plate 222 has bolt holes 2221.

[0030] Specifically, the crossbeam 23 includes a first connecting plate 231, a second connecting plate 232, and a third connecting plate 233 connected in an I-shape from top to bottom. The first connecting plate 231 and the third connecting plate 233 are horizontally arranged and have one end detachably fixed to the side of the first column 1. The second connecting plate 232 is vertically arranged and its upper and lower ends are respectively fixedly connected to the middle of the first connecting plate 231 and the third connecting plate 233. One end of the second connecting plate 232 in the horizontal direction is detachably fixed to the side of the first column 1. The lifting lug 24 is installed on the bottom surface of the third connecting plate 233. The crossbeam 23 can be an I-beam, made of HN250×125×6×9 hot-rolled H-beam, 0.8m in length, and made of Q355B steel. The first connecting plate 231 forms the upper flange of the crossbeam 23, the second connecting plate 232 forms the web of the crossbeam 23, and the third connecting plate 233 forms the lower flange of the crossbeam 23. Bolt holes are located at the left end of the web. For heavy main and secondary steel beams, triangular reinforcing ribs can be added at the connection nodes between the main beam and the steel structure column to enhance the connection structure of the main beam 4 and improve the shear bearing capacity of the node.

[0031] Specifically, the connecting bracket 3 includes a frame body 31. Hanging rings 32 are horizontally protruding on opposite sides of the upper end of the frame body 31. At least two spaced diagonal braces 36 are fixed to the lower end of each hanging ring 32. The upper end of each diagonal brace 36 is fixedly connected to the hanging ring 32 by welding, and the lower end is fixedly connected to the frame body 31 by welding. The first slot 331 and the second slot 341 are located at the lower end of the frame body 31.

[0032] Specifically, the horizontal cross-section of the lifting ring 32 is rectangular, and the upper ends of the two diagonal braces 36 are respectively connected to two adjacent vertices on the lifting ring 32.

[0033] Specifically, at least one first connecting block 33 and a second connecting block 34 corresponding to each of the first connecting blocks 33 are detachably installed at the lower end of the frame body 31. Both the first connecting blocks 33 and the second connecting blocks 34 are U-shaped and their openings are opposite each other. A first slot 331 is located on each of the first connecting blocks 33, and a second slot 341 is located on each of the second connecting blocks 34. The lower end of the frame body 31 is provided with a tie rod 35 corresponding to each of the first connecting blocks 33 and each of the second connecting blocks 34. The upper ends of each of the first connecting blocks 33 and each of the second connecting blocks 34 are detachably fixed to the lower ends of the corresponding tie rods 35. The frame body 31, diagonal brace 36, tie rod 35, and lifting ring 32 can all be made of steel round tubes, specifically P45×3.5 steel round tubes of Q355B material. The overall dimensions of the frame body 31 are: height 1.2m, length 0.85m, and width 0.45m.

[0034] The combined lifting device for the main and secondary steel beams in this scheme, analyzed by finite element method, shows that the maximum vertical displacement of the steel column is -0.45mm, the maximum lateral displacement is 0.07mm, the maximum stress is 48.6MPa, and the maximum stress ratio is 0.26, all meeting the specifications. The maximum vertical displacement of each component of connecting bracket 3 is -0.27mm, the maximum lateral displacement is 0.01mm, the maximum stress is -92.7MPa, and the maximum stress ratio is 0.48, all meeting the specifications.

[0035] During construction, the steel structure main and secondary beam combined lifting device of this scheme, for the combined lifting method of steel structure main and secondary beams in confined spaces, includes the following steps: S1. Prefabricate several hoisting supports 2 and connecting brackets 3 according to the design drawings, and install the hoisting supports 2 on each steel structure column. Each connecting bracket 3 is used to connect the main beam 4 and secondary beam 5 of the steel structure. After the main and secondary beams 5 are assembled on the ground, they are connected together through each connecting bracket 3. Positioning lines for the connecting rods 22 can be marked on the surface of the support seat 21 formed by the existing steel brackets on the steel structure column. The support seat 21 and connecting rod 22 are fixed with high-strength bolts through the second positioning plate 2111 set on the upper surface of the support seat 211. Bolt holes 2221 are provided on the second positioning plate 2111. That is, the crossbeam 23 can be fixedly connected to the steel structure column through the first high-strength bolt, and the connecting rod 22 can be fixedly connected to the steel bracket through the second high-strength bolt.

[0036] S2. The two connecting brackets 3 are respectively fitted onto both ends of the main beam 4, and the first connecting blocks 33 and the second connecting blocks 34 are fixedly connected to the main steel beam so that the two sides of the main beam 4 can be respectively embedded into the first slots 331 and the second slots 341. Among them, the lifting rings 32 formed by the steel round tubes at the upper ends of the connecting brackets 3 located on different main beams 4 are respectively connected to both ends of a secondary steel beam. The two main beams 4 can be parallel to each other and spaced apart, and the two secondary beams 5 can be parallel to each other and spaced apart. The secondary beams 5 can be perpendicular to the main beams 4, and both secondary beams 5 are located between the two main beams 4.

[0037] S3. Each lifting lug 24 is equipped with a hand chain hoist. Four people pull the hoist chain simultaneously to lift the two main beams 4 simultaneously. The four connecting brackets 3 installed on the two main beams 4 are also lifted simultaneously, which in turn pulls the two secondary beams 5 to lift them smoothly, so as to achieve the effect of "lifting the main beams and secondary beams 5 together and simultaneously, and achieving the effect of "lifting both beams in one go".

[0038] S4. Lift the main and secondary beams 5 into place. After the main and secondary steel beams are welded, remove the bolts that connect the main and secondary steel beams 5 of this scheme to the column. Then the connecting rods 22 and the crossbeams 23 on each hoisting support 2 can be removed from the column without affecting the subsequent use of the structure.

[0039] Other aspects of the combined lifting device for main and secondary beams of steel structure described in this utility model are found in the prior art and will not be repeated here.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A combined lifting device for main and secondary beams of a steel structure, which lifts the main beams and secondary beams by being installed on several columns, characterized in that: The device includes several connecting brackets and at least four lifting lugs. Each column has at least one lifting lug installed at its upper end. The columns are arranged to form at least one U-shape, with a column at each of the four vertices of the U-shape. The four columns forming the U-shape are designated as the first column, the second column, the third column, and the fourth column. Two adjacent lifting lugs are used to lift the two ends of a main beam. The upper ends of two oppositely arranged connecting brackets are used to connect the two ends of a secondary beam. The two main beams are spaced apart and parallel to each other, and are lifted synchronously. Two connecting brackets are connected to a main beam at intervals. The two secondary beams are located between the two opposite main beams and are perpendicular to the main beams. The two ends of each secondary beam are connected to the two opposite main beams through a connecting bracket. The lower ends of each connecting bracket are provided with a first slot and a second slot, which are horizontally arranged and opposite to each other. The two sides of one end of the main beam can be inserted into the first slot and the second slot, respectively.

2. The steel structure main and secondary beam combined lifting device according to claim 1, characterized in that: The upper ends of the first column, the second column, the third column, and the fourth column are each equipped with several spaced-apart lifting supports. Each lifting support includes a crossbeam and a connecting rod connected sequentially from top to bottom. A support seat is provided below the connecting rod. The support seat is horizontally positioned and one end is connected to the first column. The connecting rod is vertically positioned and its lower end is detachably fixed to the upper surface of the support seat. The upper end of the connecting rod is detachably fixed to the bottom surface of the crossbeam. The crossbeam is horizontally positioned and one end is detachably fixed to the first column. The horizontal length of the crossbeam is greater than the horizontal length of the support seat. The lifting lug is installed on the lower surface of the crossbeam and is located on the side of the connecting rod away from the first column.

3. The steel structure main and secondary beam combined lifting device according to claim 2, characterized in that: The first column, the second column, the third column, and the fourth column are all steel structure columns, and their horizontal cross sections are all square. Each of the four sides of the upper end of the steel structure column is equipped with a hoisting support.

4. The steel structure main and secondary beam combined lifting device according to claim 3, characterized in that: The support base includes a first support plate, a second support plate, and a third support plate, which are fixedly connected in an I-shape from top to bottom. The first and third support plates are both horizontally arranged and one end is fixedly connected to the side of the first column. The second support plate is vertically arranged and its upper and lower ends are fixedly connected to the middle of the first and third support plates, respectively. One end of the second support plate in the horizontal direction is fixedly connected to the side of the first column. The lower end of the connecting rod is detachably fixed to the first support plate.

5. The steel structure main and secondary beam combined lifting device according to claim 4, characterized in that: The connecting rod includes a first plate, a second plate, and a third plate arranged in parallel and at intervals. The upper ends of the first plate, the second plate, and the third plate are all fixedly connected to the crossbeam, and the lower ends are all detachably fixedly connected to the first support plate. The first plate and the third plate are arranged in parallel and at intervals, and the left and right ends of the second plate are fixedly connected to the middle of the first plate and the third plate, respectively.

6. The steel structure main and secondary beam combined lifting device according to claim 5, characterized in that: The crossbeam includes a first connecting plate, a second connecting plate, and a third connecting plate connected in an I-shape from top to bottom. The first connecting plate and the third connecting plate are both horizontally arranged and one end is detachably fixedly connected to the side of the first column. The second connecting plate is vertically arranged and its upper and lower ends are respectively fixedly connected to the middle of the first connecting plate and the third connecting plate. One end of the second connecting plate in the horizontal direction is detachably fixedly connected to the side of the first column. The lifting lug is installed on the bottom surface of the third connecting plate.

7. The steel structure main and secondary beam combined lifting device according to claim 6, characterized in that: The connecting bracket includes a frame body, on which two horizontally protruding lifting rings are provided on opposite sides of the upper end of the frame body. At least two spaced diagonal braces are fixed to the lower end of each lifting ring. The upper end of each diagonal brace is fixedly connected to the lifting ring, and the lower end is fixedly connected to the frame body. The first card slot and the second card slot are located at the lower end of the frame body.

8. The steel structure main and secondary beam combined lifting device according to claim 7, characterized in that: The horizontal cross-section of the lifting ring is rectangular, and the upper ends of the two diagonal braces are respectively connected to two adjacent vertices on the lifting ring.

9. The steel structure main and secondary beam combined lifting device according to claim 8, characterized in that: At least one first connecting block and a second connecting block corresponding to each of the first connecting blocks are detachably installed at the lower end of the frame body. The first connecting block and the second connecting block are both U-shaped and are arranged opposite to each other. The openings on the first connecting block and the second connecting block are arranged opposite to each other. The first slot is located on each of the first connecting blocks and the second slot is located on each of the second connecting blocks.

10. The steel structure main and secondary beam combined lifting device according to claim 9, characterized in that: The lower end of the frame body is provided with a tie rod corresponding to each of the first connecting blocks and each of the second connecting blocks. The upper end of each of the first connecting blocks and each of the second connecting blocks is detachably fixed to the lower end of the corresponding tie rod.

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