A structure overhanging steel support for overlapping large-span bailey truss

Abstract

The utility model discloses a structure overhanging steel support for overlapping large-span bailey truss, it includes steel beam, first steel diagonal brace and second steel diagonal brace, steel beam is arranged in the floor of main body structure, and its both ends respectively stretch out from the front and back sides of main body structure, form the cantilever beam structure, the upper end of first steel diagonal brace is fixedly connected with the front end bottom of steel beam, and the lower end is fixedly connected with the front side wall column of the floor below main body structure, the upper end of second steel diagonal brace is fixedly connected with the rear end bottom of steel beam, and the lower end is fixedly connected with the rear side wall column of the floor below main body structure, wherein, under the support of first steel diagonal brace and second steel diagonal brace, steel beam is suspended in the same floor. Adopting the utility model, enough cantilever length and bearing capacity can be provided, have excellent rigidity and stability, and it is convenient for standardization production and quick installation, and can realize repeated turnover use, to solve the core support problem in high altitude large-span concrete corridor construction.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and more specifically, to a structural cantilever steel support for assembling large-span Bailey bridges. Background Technology

[0002] In the construction of high-rise and super high-rise buildings in this field, it is often necessary to construct large-span, cantilevered sky bridges between two main structures. The core technical challenge in constructing such bridges lies in how to provide a safe, stable, and economically feasible formwork support system for the cast-in-place concrete structure at high altitudes. Traditional solutions using ground-mounted full-span scaffolding or ordinary steel cantilever supports, at heights exceeding 50 meters, not only consume a huge amount of materials and are economically inefficient, but also have difficulty guaranteeing stability and safety, especially in dealing with the enormous bending moments generated by ultra-large cantilever structures.

[0003] Currently, Bailey bridges are widely used as the main load-bearing structure for high-altitude formwork support in the industry. Bailey bridges offer advantages such as modularity, high load-bearing capacity, and high rigidity, effectively enabling large spans. However, when applying Bailey bridges to high-altitude corridor construction, reliable support systems at both ends are required to connect them to the main structure. Traditional support methods typically involve pre-embedding steel plates in the main structure and directly erecting or welding steel brackets. This approach has significant limitations: firstly, its cantilever length is limited, generally unable to support cantilevers exceeding 4 meters, and cannot meet the construction needs of larger cantilever spans of 5-7 meters; secondly, on-site welding is labor-intensive, quality is difficult to control, and the supports are for single use only, making them unreusable and economically inefficient; thirdly, traditional supports place high demands on the embedded parts of the main structure, transmitting large concentrated forces, potentially requiring additional reinforcement of the main structure.

[0004] More importantly, during the construction of concrete connecting corridors, the loads generated by the formwork system, reinforcing steel, and the wet weight of concrete are far greater than those of steel structure connecting corridors. This places extremely high demands on the bearing capacity, stiffness, and overturning stability of the support system. Existing conventional I-beam cantilever support systems, due to their limited cross-sectional characteristics, have insufficient bending and torsional stiffness and are prone to excessive deformation or even instability under huge loads. This has become a technical bottleneck restricting the high-altitude construction of large-span, large-cantilever concrete structures.

[0005] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0006] The purpose of this utility model is to provide a structural cantilever steel support for connecting large-span Bailey bridges, which can provide sufficient cantilever length and load-bearing capacity, has excellent rigidity and stability, is easy to standardize and quickly install, and can be reused repeatedly, so as to solve the core support problem in the construction of high-altitude large-span concrete corridors.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A structural cantilever steel support for erecting a large-span Bailey bridge includes a steel beam, a first steel diagonal brace, and a second steel diagonal brace. The steel beam passes through the floors of the main structure, with its two ends extending from the front and rear sides of the main structure to form a cantilever beam structure. The upper end of the first steel diagonal brace is fixedly connected to the bottom front end of the steel beam, and the lower end is fixedly connected to the front wall column of the floor below the main structure. The upper end of the second steel diagonal brace is fixedly connected to the bottom rear end of the steel beam, and the lower end is fixedly connected to the rear wall column of the floor below the main structure. The steel beam is suspended above the floor slab of the same floor under the support of the first and second steel diagonal braces.

[0009] As a preferred embodiment of this utility model, the steel beam is spliced ​​from multiple sections of box-shaped steel; the first steel diagonal brace is box-shaped steel; the second steel diagonal brace is box-shaped steel.

[0010] As a preferred embodiment of this utility model, the front and rear ends of the steel beam are respectively provided with a plurality of first vertical ribs arranged at intervals along the length of the steel beam.

[0011] As a preferred embodiment of this utility model, among the plurality of first vertical ribs, at least two first vertical ribs are arranged in the connection area between the steel beam and the first steel diagonal brace, and at least two first vertical ribs are arranged in the connection area between the steel beam and the second steel diagonal brace.

[0012] As a preferred embodiment of this utility model, the top of the front and rear ends of the steel beam are respectively fixed with a raised support, and the top surface of the raised support is the mounting base surface.

[0013] As a preferred embodiment of the present invention, the raised support is provided with a plurality of second vertical ribs arranged at intervals along the direction of the raised support.

[0014] As a preferred embodiment of this utility model, the number of second vertical ribs is greater than the number of first vertical ribs; among the plurality of second vertical ribs, the positions of some second vertical ribs correspond one-to-one with the positions of the first vertical ribs.

[0015] As a preferred embodiment of this utility model, the structural outrigger steel support for assembling a large-span Bailey bridge further includes a first embedded steel plate. The first embedded steel plate is embedded in the front wall column of the main structure. The first embedded steel plate includes a first steel plate welded to the lower end of the first steel brace and a first reinforcing bar extending into the front wall column of the main structure. The outer surface of the first steel plate is flush with the surface of the front wall column of the main structure. The first steel plate has a plurality of first through holes arranged in an array. The number of the first reinforcing bars corresponds to the number of the first through holes. The outer ends of the first reinforcing bars pass through the first through holes and are welded to the first steel plate.

[0016] As a preferred embodiment of this utility model, the structural outrigger steel support for assembling a large-span Bailey bridge further includes a second embedded steel plate. The second embedded steel plate is embedded in the rear wall column of the main structure. The second embedded steel plate includes a second steel plate welded to the lower end of the second steel brace and a second reinforcing bar extending into the rear wall column of the main structure. The outer surface of the second steel plate is flush with the surface of the rear wall column of the main structure. The second steel plate has a plurality of second through holes arranged in an array. The number of second reinforcing bars corresponds to the number of second through holes. The outer ends of the second reinforcing bars pass through the second through holes and are welded to the second steel plate.

[0017] As a preferred embodiment of this utility model, the steel beam has overlapping segments that intersect with adjacent wall columns, and a steel support column is provided below the overlapping segment. The steel support column is embedded inside the wall column and supported on the bottom surface of the steel beam; multiple studs are evenly distributed on the outer periphery of the steel support column.

[0018] The structural cantilever steel support for connecting large-span Bailey bridges provided by this utility model has the following advantages compared with the prior art: through the cantilever support structure of steel beams and bidirectional steel diagonal braces, efficient support for Bailey bridges is achieved during the construction of aerial corridors. It can provide sufficient cantilever length and load-bearing capacity, has excellent rigidity and stability, is easy to standardize and quickly install, and can be reused repeatedly. This solves the core support problem in the construction of high-altitude large-span concrete corridors and has the advantages of convenient construction, structural stability, and high economy. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0020] Figure 1 This is an elevation view of the structural cantilever steel support for assembling a large-span Bailey bridge according to an embodiment of this utility model;

[0021] Figure 2 This is a plan view of a large-span Bailey bridge when the structural cantilever steel supports are connected.

[0022] Figure 3 This is a cross-sectional view of the connection between the first steel diagonal brace and the first embedded steel plate;

[0023] Figure 4 This is a cross-sectional view of the connection between the second steel diagonal brace and the second embedded steel plate;

[0024] Figure 5 This is a schematic diagram of the installation of steel supports and steel beams.

[0025] Marked in the image:

[0026] 10 steel beam; 11 first vertical rib; 20 first steel diagonal brace; 30 second steel diagonal brace; 40 wall column; 50 raised support; 51 second vertical rib; 60 first embedded steel plate; 61 first steel plate; 62 first reinforcing bar; 63 first through hole; 70 second embedded steel plate; 71 second steel plate; 72 second reinforcing bar; 73 second through hole; 80 steel column; 81 stud; 90 Bailey bridge. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this utility model, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] like Figures 1 to 5As shown, a preferred embodiment of this utility model proposes a structural cantilever steel support for connecting large-span Bailey bridges, comprising a steel beam 10, a first steel diagonal brace 20, and a second steel diagonal brace 30. The steel beam 10 passes through the floor of the main structure, with its two ends extending from the front and rear sides of the main structure respectively, forming a cantilever beam structure. The upper end of the first steel diagonal brace 20 is fixedly connected to the bottom front end of the steel beam 10, and the lower end is fixedly connected to the front wall column 40 of the floor below the main structure. The upper end of the second steel diagonal brace 30 is fixedly connected to the bottom rear end of the steel beam 10, and the lower end is fixedly connected to the rear wall column 40 of the floor below the main structure. The steel beam 10 is suspended above the floor slab of the same floor under the support of the first steel diagonal brace 20 and the second steel diagonal brace 30.

[0029] It is understandable that steel beam 10 refers to the main structural member bearing the cantilever load, which can be implemented using box-section steel, and its length can be adjusted according to the span of the connecting corridor in the front and rear directions. The first steel diagonal brace 20 refers to the front inclined support member, which can be implemented using welded box-section steel, with the inclination angle controlled within the range of 30-60 degrees to optimize stress distribution. The second steel diagonal brace 30 refers to the rear balancing support member, which can be implemented using welded box-section steel, with the inclination angle controlled within the range of 30-60 degrees to optimize stress distribution, and together with the first steel diagonal brace 20, forms a two-way stable triangular support system.

[0030] Specifically, when steel beam 10 passes through the main building structure floors, its axis remains horizontal with the floor plan. The upper end of the front steel diagonal brace is connected to the front bottom plate of steel beam 10 by welding or high-strength bolts, and the lower end is welded to the steel plate embedded in the front wall column 40. The rear steel diagonal brace forms a reverse support in the same way, and the two together form a spatial truss structure. The suspended section of steel beam 10 remains suspended from the floor slab of the same floor to avoid the direct transfer of construction loads to the floor slab.

[0031] Therefore, this utility model embodiment achieves efficient support for the Bailey bridge 90 during the construction of the aerial corridor through the cantilever support structure of the steel beam 10 and the bidirectional steel diagonal brace. It can provide sufficient cantilever length and load-bearing capacity, has excellent rigidity and stability, is easy to standardize and quickly install, and can be reused repeatedly. This solves the core support problem in the construction of high-altitude, large-span concrete corridors and has the advantages of convenient construction, stable structure, and high economy.

[0032] For example, in this embodiment of the present invention, the steel beam 10 is further proposed to be composed of multiple sections of box-shaped steel spliced ​​together.

[0033] As is understood, box-section steel refers to steel structural members with a rectangular or square closed cavity cross-section. They can be manufactured using welding or rolling processes and are characterized by high bending stiffness and strong torsional resistance. Multi-segment splicing refers to cutting a single box-section steel into independent units of controllable length. These units can be assembled in sections using high-strength bolts or welding, facilitating adjustments to component lengths based on site conditions. Therefore, the segmented design of steel beam 10 avoids the transportation limitations of ultra-long components and reduces the difficulty of high-altitude hoisting operations. After segmenting the box-section steel, the component dimensions can be flexibly adjusted according to transportation conditions, and the on-site assembly process does not require large lifting equipment, effectively reducing construction costs. Furthermore, the closed cross-section characteristics of box-section steel give it a superior load-bearing capacity compared to I-beams or H-beams with the same amount of steel, which is beneficial for improving the stability of cantilever structures.

[0034] For example, in this embodiment of the present invention, the first steel diagonal brace 20 is made of box-shaped steel; the second steel diagonal brace 30 is made of box-shaped steel.

[0035] It is understood that box-section steel refers to steel sections with a closed rectangular or square cavity cross-section. Specifically, it can be formed into hollow steel components using welding or rolling processes, and its internal cavity can be further strengthened by adding stiffening ribs. The cross-sectional characteristics of box-section steel give it high bending stiffness and torsional stability under axial pressure, effectively dispersing local stress concentration. Therefore, the first steel brace 20 and the second steel brace 30 form a stable two-way compressive support system through the closed cross-section structure of the box-section steel. When the steel beam 10 is subjected to construction loads, the box-section steel brace, through its superior moment of inertia, converts the bending moment transmitted by the steel beam 10 into axial pressure, thereby reducing the stress peak at the brace connection nodes. Simultaneously, the closed cross-section characteristics of the box-section steel avoid the problem of local buckling that easily occurs in traditional open-section steel sections under complex stress conditions, ensuring the overall stability of the brace under dynamic construction loads.

[0036] For example, in this embodiment of the present invention, a plurality of first vertical ribs 11 are provided at the front and rear ends of the steel beam 10, which are spaced apart along the length of the steel beam 10.

[0037] It is understood that the first vertical rib 11 refers to a steel plate welded perpendicular to the axis of the steel beam 10. Specifically, it can be a steel plate with a thickness of 10-20 mm, cut and shaped, with its width and height matching the cross-sectional height and width of the steel beam 10. This first vertical rib 11 is connected to each panel of the steel beam 10 through double-sided fillet welds, used to enhance the local stiffness and bending load-bearing capacity of the steel beam 10. The "interval arrangement" refers to the ribs being arranged along the longitudinal direction of the steel beam 10 at fixed or non-fixed intervals. Specifically, the arrangement can be determined based on the installation position of the Bailey bridge 90 and the connection area of ​​the steel diagonal braces. By optimizing the load transfer path through a reasonable spacing arrangement, the steel beam 10 forms a continuous support system in the cantilevered state.

[0038] In some specific embodiments, at least two of the multiple first vertical ribs 11 are arranged in the connection area between the steel beam 10 and the first steel diagonal brace 20, and at least two of the first vertical ribs 11 are arranged in the connection area between the steel beam 10 and the second steel diagonal brace 30. The connection area refers to the contact range where the steel diagonal brace connects to the bottom of the steel beam 10, which can be achieved through welding or high-strength bolts. Its function is to transfer the supporting force of the steel diagonal brace to the steel beam 10 and form a clear force transmission path. Therefore, by arranging at least two first vertical ribs 11 in the connection areas of the first steel diagonal brace 20 and the second steel diagonal brace 30 respectively, the connection area between the steel beam 10 and the steel diagonal brace is strengthened, thereby improving the load-bearing stability of the connection node between the steel beam 10 and the steel diagonal brace, reducing safety hazards caused by local deformation during high-altitude construction, and ensuring that the construction load is efficiently transferred to the main structure through a rigid connection, avoiding fatigue damage to components due to stress concentration.

[0039] For example, in this embodiment of the present invention, a raised support 50 is fixedly provided at the top of the front and rear ends of the steel beam 10, and the top surface of the raised support 50 is the mounting base surface.

[0040] It is understandable that the raised support 50 refers to the support structure that is welded or bolted to the top surface of the end of the steel beam 10. Specifically, it can be implemented using box-shaped steel. Its vertical height can be adjusted according to the construction elevation requirements of the connecting corridor. Its top surface provides a precise benchmark reference for the subsequent erection of the Bailey bridge 90.

[0041] For example, the present utility model embodiment further proposes that the raised support 50 is provided with a plurality of second vertical ribs 51 arranged at intervals along the direction of the raised support 50; the number of second vertical ribs 51 is greater than the number of first vertical ribs 11; among the plurality of second vertical ribs 51, the positions of some second vertical ribs 51 correspond one-to-one with the positions of the first vertical ribs 11.

[0042] It is understood that the second vertical rib 51 refers to a reinforcing steel plate perpendicular to the top surface of the raised support 50 and distributed along its length. Specifically, it can be made of steel plate with a thickness of 10-20 mm, cut and shaped to match the width and height of the steel beam 10 section, used to improve the bending stiffness and torsional performance of the raised support 50. The interval arrangement along the length of the raised support 50 means that the ribs maintain a uniform or non-uniform spacing, which can be arranged according to the installation position of the Bailey bridge 90 to balance structural strength and material usage. During construction, when the vertical load of the Bailey bridge 90 is transferred to the steel beam 10 through the raised support 50, the second vertical rib 51 can effectively restrain the lateral deformation of the raised support 50, avoiding weld cracking caused by local stress concentration. The position of some of the second vertical ribs 51 is aligned with the first vertical ribs 11 on the steel beam 10, forming a continuous force transmission path and further enhancing the integrity of the connection node.

[0043] For example, this utility model embodiment further proposes that the structural cantilever steel support also includes a first embedded steel plate 60 and a second embedded steel plate 70. The first embedded steel plate 60 is embedded in the front wall column 40 of the main structure. The first embedded steel plate 60 includes a first steel plate 61 welded to the lower end of the first steel diagonal brace 20 and a first reinforcing bar 62 extending into the front wall column 40 of the main structure. The outer surface of the first steel plate 61 is flush with the surface of the front wall column 40 of the main structure. The first steel plate 61 has a plurality of first through holes 63 arranged in an array. The number of first reinforcing bars 62 corresponds to the number of first through holes 63. The outer end of the first steel plate 70 is inserted into the first through hole 63 and welded to the first steel plate 61; the second embedded steel plate 70 is embedded in the rear wall column 40 of the main structure. The second embedded steel plate 70 includes a second steel plate 71 welded to the lower end of the second steel brace 30 and a second steel bar 72 extending into the rear wall column 40 of the main structure. The outer surface of the second steel plate 71 is flush with the surface of the rear wall column 40 of the main structure. The second steel plate 71 has a plurality of second through holes 73 arranged in an array. The number of second steel bars 72 corresponds to the number of second through holes 73. The outer end of the second steel bar 72 is inserted into the second through hole 73 and welded to the second steel plate 71.

[0044] It is understandable that the first embedded steel plate 60 and the second embedded steel plate 70 refer to anchoring components that form an integrated connection with the main structural wall column 40. This can be achieved through pre-embedded welding, enhancing the bond strength with the concrete structure through the combination of the steel plate and reinforcing bars. The first through hole 63 and the second through hole 73 refer to regularly arranged holes on the surface of the steel plate, used for precise positioning of the reinforcing bar insertion points. The first reinforcing bar 62 and the second reinforcing bar 72 refer to anchoring members embedded in the concrete structure, specifically made by bending threaded reinforcing bars, with their outer ends welded to the steel plate to form a bidirectional force-bearing node. Specifically, before the main structural wall column 40 is poured, the first steel plate 61 with the array of through holes is pre-assembled with the corresponding number of reinforcing bars. After the reinforcing bars pass through the through holes in the steel plate, a rigid connection node is formed by double-sided welding. After the embedded components are poured into the concrete, the outer surface of the steel plate remains flush with the wall column 40 finish, avoiding interference during later construction. The first steel diagonal brace 20 is directly welded to the steel plate during installation, forming a diagonal brace support with a clearly defined force transmission path. Therefore, this utility model embodiment achieves the centralized transfer of the diagonal bracing load to the concrete structure through the combined node formed by welding the pre-embedded steel plate and the reinforcing bar, ensuring that the force transmission path of the diagonal bracing is directly transmitted to the load-bearing wall column 40 of the main structure, while avoiding damage to the main structure caused by on-site drilling, and significantly improving construction safety and structural stability.

[0045] For example, in this embodiment of the present invention, the steel beam 10 is provided with overlapping segments that intersect with the adjacent wall column 40. A steel support column 80 is provided below the overlapping segment. The steel support column 80 is embedded in the wall column 40 and supported on the bottom surface of the steel beam 10. A plurality of studs 81 are evenly distributed on the outer periphery of the steel support column 80.

[0046] It is understandable that the overlapping segments of the steel beam 10 and the wall column 40 refer to the areas where the steel beam 10 and the wall column 40 spatially intersect when the steel beam 10 passes through the main structure. Specifically, this can be achieved by using 3D modeling to determine the arrangement path of the steel beam 10 and the positional relationship with the wall column 40. The overlapping segments of the steel beam 10 are pre-embedded during the main structure construction phase. This design ensures that the steel beam 10 maintains the continuity of force when passing through the structure. The steel column 80 refers to a vertically installed steel structural support component pre-embedded inside the wall column 40 during the main structure construction phase. Specifically, it can be implemented using a steel-concrete composite column, with a downward extension length of not less than 2 meters, and its top directly supporting the bottom surface of the steel beam 10, thus distributing the concentrated load of the steel beam 10 in the overlapping area. The stud 81 refers to a cylindrical shear connector welded to the surface of the steel component. Specifically, studs 81 with a diameter of 19 mm and a height of 10 mm can be evenly arranged at a spacing of 200 mm to enhance the bond strength between the steel column 80 and the concrete wall column, preventing relative slippage between the two. Therefore, through the synergistic effect of the pre-embedded steel support column 80 and the stud 81, the connection between the steel beam 10 and the main structure has higher reliability and durability, making it particularly suitable for the construction of large-span connecting corridors in super high-rise buildings.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A structural cantilever steel support for assembling large-span Bailey bridges, characterized in that, include: Steel beams are installed in the floors of the main structure, with both ends extending from the front and rear sides of the main structure to form a cantilever beam structure. The first steel diagonal brace has its upper end fixedly connected to the bottom front end of the steel beam and its lower end fixedly connected to the front wall column of the floor below the main structure. The second steel diagonal brace has its upper end fixedly connected to the bottom of the rear end of the steel beam, and its lower end fixedly connected to the rear wall column of the floor below the main structure. The steel beam is suspended above the floor slab on the same floor by the support of the first and second steel diagonal braces.

2. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 1, characterized in that, The steel beam is composed of multiple sections of box-shaped steel; the first steel diagonal brace is box-shaped steel; the second steel diagonal brace is box-shaped steel.

3. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 2, characterized in that, The steel beam is provided with multiple first vertical ribs at intervals along the length of the steel beam at both its front and rear ends.

4. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 3, characterized in that, Of the plurality of first vertical ribs, at least two first vertical ribs are arranged in the connection area between the steel beam and the first steel diagonal brace, and at least two first vertical ribs are arranged in the connection area between the steel beam and the second steel diagonal brace.

5. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 3, characterized in that, The steel beam has raised supports fixed at the top of its front and rear ends, and the top surface of the raised supports is the mounting base surface.

6. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 5, characterized in that, The raised support is provided with multiple second vertical ribs arranged at intervals along the direction of the raised support.

7. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 6, characterized in that, The number of second vertical ribs is greater than the number of first vertical ribs; among the multiple second vertical ribs, the positions of some second vertical ribs correspond one-to-one with the positions of the first vertical ribs.

8. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 1, characterized in that, It also includes a first embedded steel plate, which is embedded in the front wall column of the main structure. The first embedded steel plate includes a first steel plate welded to the lower end of the first steel brace and a first reinforcing bar extending into the front wall column of the main structure. The outer surface of the first steel plate is flush with the surface of the front wall column of the main structure. The first steel plate has a plurality of first through holes arranged in an array. The number of the first reinforcing bars corresponds to the number of the first through holes. The outer ends of the first reinforcing bars pass through the first through holes and are welded to the first steel plate.

9. The structural cantilever steel support for assembling large-span Bailey bridges according to claim 1, characterized in that, It also includes a second embedded steel plate, which is embedded in the rear wall column of the main structure. The second embedded steel plate includes a second steel plate welded to the lower end of the second steel brace and a second reinforcing bar extending into the rear wall column of the main structure. The outer surface of the second steel plate is flush with the surface of the rear wall column of the main structure. The second steel plate has a plurality of second through holes arranged in an array. The number of the second reinforcing bars corresponds to the number of the second through holes. The outer ends of the second reinforcing bars pass through the second through holes and are welded to the second steel plate.

10. The structural cantilever steel support for assembling large-span Bailey bridges according to any one of claims 1 to 9, characterized in that, The steel beam has overlapping segments that intersect with adjacent wall columns. A steel support column is provided below the overlapping segment. The steel support column is embedded inside the wall column and supports the bottom surface of the steel beam. Multiple studs are evenly distributed on the outer periphery of the steel support column.

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