Modular assembly type steel box girder connecting system and construction method

Abstract

The invention discloses a modular assembly type steel box girder connecting system and a construction method, the modular assembly type steel box girder connecting system comprises a steel box girder and a girder embedded restraint steel end plate, an embedded part is embedded from the connecting end of the steel box girder, an annular wing plate is located outside the steel box girder, and the modular assembly type steel box girder connecting system further comprises a side restraint ring sealing plate and a restraint cover plate, the side restraining ring sealing plates seal the beam end installation gaps on the front side and the rear side and restrain the two annular wing plates on the same side, the restraining cover plates seal the beam end installation gaps on the upper side and the lower side and restrain the two annular wing plates on the same side, and the side restraining ring sealing plates and the restraining cover plates are connected through tenons and mortises. And the central plugging steel plate is used for plugging the central mounting gap. According to the modular assembly type steel box girder connecting system, assembly type connection is adopted completely, welding operation is not needed, restraining components are arranged on the inner side and the outer side of the steel box girder, under the action of external force, the restraining components on the inner side and the outer side act jointly, and the butt joint connecting end portions of the box girder are restrained not to generate relative displacement or corner; therefore, effective butt joint and fixation of the box girders are achieved.

Description

Technical Field

[0001] This invention belongs to the field of steel structures, and in particular to a modular prefabricated steel box girder connection system and construction method. Background Technology

[0002] Currently, there are two main methods for on-site butt connection of steel box girders in steel frame structures: 1. When the internal space of the steel box girder in the bridge structure is sufficient to allow construction personnel to enter and operate, a bolted and welded combination method is adopted. That is, the bottom plate and side plate of the bridge steel box girder are connected by high-strength bolts with double-sided clamps, and the bridge deck is connected by welding butt joint. This connection method requires a large operating space.

[0003] Second, when the internal space of the box girder cannot meet the requirements, a fully welded connection is often adopted, where the butt joints of the steel box girders are connected and fixed together by welds. During the welding process, attention must be paid to the quality control of the welds to prevent brittle failure caused by welding defects. However, fully welded connections are no longer in line with the current concept of prefabricated construction.

[0004] Both types of construction sites cannot be separated from welding operations. Welding operations do not meet the requirements of green and environmentally friendly construction. At the same time, the construction efficiency is relatively low, the welding quality control is difficult, and the requirements for the workers' own abilities and skills are high. In addition, there are significant safety and fire hazards during the welding process, and the dust and gases generated during the welding process also affect the health of the workers.

[0005] The newly released "Technical Guidelines for Prefabricated Steel Structure Modular Buildings" does not yet specify prefabricated joint methods or devices that can meet the existing prefabricated joint connection requirements for steel box girders in the market. Summary of the Invention

[0006] The purpose of this invention is to provide a modular prefabricated steel box girder connection system and construction method, which aims to solve the technical problems in the existing steel frame structure steel box girder docking construction, such as the inability to separate welding operations, low construction efficiency, difficulty in welding quality control, high requirements for workers' abilities and skills, significant safety and fire hazards, and the impact of the welding process on the health of workers.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A modular prefabricated steel box girder connection system, comprising: The steel box girders to be connected on both the left and right sides; Two beams are arranged opposite each other with embedded steel end plates. Each includes an embedded part and an annular wing plate. The embedded part is inserted from the connection end of the corresponding side steel box girder. The annular wing plate is located outside the corresponding side steel box girder and extends outward from the outer contour of the connection end. A beam end installation gap is reserved between the annular wing plate and the connection end of the corresponding side steel box girder. A central installation gap is reserved between the two annular wing plates. The steel components surrounding the beam constrain the portion of the annular flange extending out of the steel box girder. These components include side constraint ring sealing plates installed on the front and rear sides, which block the installation gaps at the beam ends on the front and rear sides and constrain the two annular flanges on the same side. The components also include constraint cover plates installed on the upper and lower sides, which block the installation gaps at the beam ends on the upper and lower sides and constrain the two annular flanges on the same side. The end connections of the side constraint ring sealing plates and the constraint cover plates mutually limit each other. The central sealing steel plate is inserted between two annular wing plates along the front and rear sides to seal the central installation gap. The front and rear ends of the central sealing steel plate pass outward through the central axis hole of the side constraint ring sealing plate. One end of the central sealing steel plate is provided with a limiting pad that snaps onto the outer side of the same side constraint ring sealing plate, and the other end is provided with a bolt hole and is fixed by limiting the position with a high-strength bolt and a double nut pad assembly.

[0008] The inner frame plate is a vertical annular wing plate. The outer wall of the inner frame plate is adapted to and fits the inner wall of the steel box girder. The reserved holes of the annular wing plate are adapted to the inner wall of the inner frame plate.

[0009] The inner frame plate is also equipped with a stiffening plate, and the center of the stiffening plate has an exhaust hole.

[0010] The side restraint ring sealing plate includes a fixing plate that fits into two annular wing plates on the same side. The central hole is a rectangular hole set on the fixing plate. The height of the central hole is adapted to the height of the two annular wing plates on the same side. The width of the central hole is based on fitting into the two annular wing plates on the same side. The outer surface of the fixing plate is flush with the outer surface of the two annular wing plates on the same side.

[0011] The fixing plate has a side rib extending inward along the inner wall edge of the central hole at the beam end installation gap position. The side rib is inserted into the beam end installation gap and its end face fits against the outer wall of the inner frame plate. The height of the side rib is adapted to the height of the inner frame plate. The fixing plate has a mortise at the position corresponding to the constraint cover plate. The shape of the mortise is adapted to the cross-section of the constraint cover plate. The distance between the mortise between the two side constraint ring sealing plates is adapted to the length of the constraint cover plate.

[0012] The cross-section of the restraint cover plate is U-shaped, including side panels and back cover plate. The thickness of the side panels is greater than the beam end installation gap. The inner side of the side panels is provided with a cover insert rib extending out of the side panels at the position corresponding to the beam end installation gap. The inside angle formed by the cover insert rib and the side panels is adapted to the outside angle of the edge of the steel box girder connection end. The U-shaped groove is fastened to the top or bottom outer side of the two annular wing plates on the same side and the central sealing steel plate. The cover insert rib is inserted into the beam end installation gap and its end face is in contact with the outer wall of the inner frame plate and the corresponding side surface of the side insert rib.

[0013] The length of the constraint cover plate is greater than the width of the steel box girder, and tenons are formed at both ends. The tenons are inserted into the mortises on the front and rear sides and connected by mortise and tenon joints.

[0014] The central sealing steel plate includes the plate itself, the height of which is adapted to the height of the central shaft hole. A limiting pad is fixedly connected to one end face of the plate, the height of which is adapted to the height of the central shaft hole, and the width of which is not less than the width of the central shaft hole. Bolt holes are arranged in rows at the other end of the plate. High-strength bolts are arranged in rows corresponding to the bolt holes. Double nut pad assemblies are arranged on both sides of the central sealing steel plate, including two pads and two nuts. The thickness of the pads is greater than the thickness of the side insert ribs, and the width of the pads is not greater than the width of the central sealing steel plate extending out of the same side restraint ring sealing plate. The high-strength bolts pass through the two ends of the bolt holes, pass through the pads respectively, and are anchored by the nuts.

[0015] The modular prefabricated steel box girder connection system also includes frame columns on both sides. The steel box girders to be connected are corbels and long beams connected to the frame columns. The corbels are short beams with the same specifications as the long beams.

[0016] The construction method and steps for this modular prefabricated steel box girder connection system are as follows: Step 1: Based on the dimensions of the steel box girders to be connected, design the dimensions of each component of the modular prefabricated steel box girder connection system and process them in the factory. The embedded restraint steel end plates on the short beam side are pre-welded to the short beam during factory processing, while the embedded restraint steel end plates on the long beam side are embedded in the beam without fixed connection and are in an adjustable telescopic mode. Step 2: Before installing the long beam, the verticality of the frame columns on both sides is corrected to ensure that the clearance between the two frame columns meets the installation requirements of the long beam; the embedded steel end plates at both ends of the long beam are completely compressed into the beam to leave enough space for the long beam to be installed in place. Step 3: Hoist the long beam into place, pull out the embedded restraint steel end plate of the beam, and adjust the installation gap between the annular wing plate and the beam end of the long beam to meet the design requirements; Step 4: Install the side constraint ring sealing plate on one side to limit the annular wing plate on that side and make the installation gap at the beam end on that side tight. Step 5: Insert the central sealing steel plate to seal the central installation gap, and secure the limiting pad to the outside of the side constraint ring sealing plate in Step 4. Step 6: Install the constraint cover plate. The constraint cover plate consists of an upper cover plate and a lower cover plate to ensure that the top and bottom of the long beam and the short beam are tightly sealed. One end of the constraint cover plate is mortised and tenoned to the side constraint ring sealing plate in Step 4. Step 7: Install the side constraint ring sealing plate on the other side, limit the annular wing plate on that side and make the installation gap at the beam end on that side tight, and limit the constraint cover plate at the same time. That is, the other end of the constraint cover plate is mortised and tenoned with the side constraint ring sealing plate in this step. At this time, the central sealing steel plate passes through the central shaft hole of the side constraint ring sealing plate in this step and exposes the bolt hole. Step 8: Insert high-strength bolts into the bolt holes, and pass them through pads at both ends and anchor them with nuts, so that the components form an integral load-bearing unit under load, and the long beam and short beam are connected.

[0017] Compared with the prior art, the present invention has the following features and beneficial effects: This invention is a modular prefabricated steel box girder connection system. All connections are prefabricated and no welding is required. By setting constraint components on the inner and outer sides of the steel box girder, the inner and outer constraint components work together under the action of external forces to constrain the relative displacement and rotation between the butt joints of the box girder, thereby achieving effective docking and fixing of the box girder.

[0018] The connection and fixing mechanism between the various components in the node area of ​​this invention includes interlocking, mortise and tenon joints, and bolt connections. The outer perimeter restraint steel assembly of the beam is tightened against the embedded part by reserving a safety gap. The embedded restraint steel end plate, steel box girder, and central sealing steel plate are connected by the interlocking of the side restraint ring sealing plates to ensure that the three are mutually tightened. The restraint cover plate is fixed to the side restraint ring sealing plates on both sides by mortise and tenon joints. The anchor bolt node on one side of the central sealing steel plate serves as the final limiting device to ensure that the overall unit forms an integral unit. The components in the unit are fixed by planing and tightening each other, mutually restraining and restricting each other to form a unit, ensuring that the structural unit has reliable restraint in all directions. The entire operation process adopts prefabricated connection, avoiding welding operations.

[0019] The present invention forms a prefabricated quick-assembly and quick-disassembly system through the interaction of the whole components, so that the whole device can be systematized and integrated. In the planning and design stage, the mutual influence of each link of design, processing and construction is considered in advance to achieve collaborative operation. In the implementation stage, the integrated design, processing and assembly technology is adopted to ensure the efficient application of the system. All components are manufactured by casting process, and the processing technology is relatively simple.

[0020] This invention enables prefabricated fixing on-site. With the guidance of technical personnel, front-line workers can operate the steel structure independently, improving the overall construction efficiency and assembly rate of the structure. Quality is easier to control, eliminating fire hazards caused by welding operations on-site, ensuring pollution-free construction, and conforming to the concept of green environmental protection. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention from another angle.

[0024] Figure 3 yes Figure 1 A schematic diagram showing the structure where the steel box girder on one side is removed, revealing the connection between the surrounding steel restraint components and the embedded part.

[0025] Figure 4 This is an exploded three-dimensional structural diagram of the present invention.

[0026] Figure 5 This is a three-dimensional structural diagram of a beam with embedded restraining steel end plates.

[0027] Figure 6 This is a three-dimensional structural diagram showing the connection between the embedded restraint steel end plate and the steel box girder.

[0028] Figure 7 This is a top view of the structure, showing the beam end installation gap and the central installation gap formed after the steel box girders on both sides are connected by embedded restraint steel end plates.

[0029] Figure 8 yes Figure 7 A schematic diagram of the three-dimensional structure.

[0030] Figure 9 This is a three-dimensional structural diagram of the side constraint ring sealing plate.

[0031] Figure 10 yes Figure 8 A three-dimensional structural diagram showing the connection between the side constraint ring sealing plate on one side and the annular wing plate, and the sealing of the beam end installation gap.

[0032] Figure 11 yes Figure 10 A top-view structural diagram.

[0033] Figure 12 This is a three-dimensional structural diagram of the central sealing steel plate.

[0034] Figure 13 yes Figure 10 Schematic diagram of the three-dimensional structure after the central sealing steel plate is installed.

[0035] Figure 14 yes Figure 13 A top-view structural diagram.

[0036] Figure 15 yes Figure 13 A top view of the structure with the side constraint ring sealing plate removed.

[0037] Figure 16 This is a schematic diagram of the three-dimensional structure of the constraint cover plate.

[0038] Figure 17 This is a three-dimensional structural diagram showing the connection relationship between the constraint cover plate and the side constraint ring sealing plate.

[0039] Figure 18 yes Figure 13 A schematic diagram of the three-dimensional structure after the constraint cover plate is installed.

[0040] Figure 19 yes Figure 18 A three-dimensional structural diagram of the side constraint ring sealing plate installed on the other side.

[0041] Figure 20 yes Figure 19 A schematic diagram of the completed 3D structure.

[0042] Figure 21 yes Figure 20 A top view of the structure after the constraint cover plate has been removed.

[0043] Figure 22 yes Figure 20 A three-dimensional structural diagram of the assembly with high-strength bolts and a double-nut pad on one side.

[0044] Figure 23 yes Figure 22 A three-dimensional structural diagram of the double nut pad assembly on the other side.

[0045] Figure 24 This is a schematic diagram of the structure completed in step two of the construction method.

[0046] Figure 25 This is a structural diagram showing the completion of step three of the construction method.

[0047] Figure 26 yes Figure 25 The diagram shows the structure before the embedded restraint steel end plate 2 is pulled out from the side of the long beam.

[0048] Figure 27 yes Figure 25 In the middle, a schematic diagram of the structure after the long beam is pulled out from the side and the embedded restraining steel end plate 2 is completed.

[0049] Figure 28 This is a structural diagram showing the completion of step five of the construction method.

[0050] Figure 29 This is a structural diagram showing the completion of step seven of the construction method.

[0051] Figure 30 yes Figure 29 Enlarged view of the node portion.

[0052] Figure 31 This is a structural diagram showing the completion of step eight of the construction method.

[0053] Figure 32 yes Figure 31 Enlarged view of the node portion.

[0054] Reference numerals: 1-Steel box girder, 11-Long girder, 12-Short girder, 2-Beam embedded restraint steel end plate, 21-Embedded part, 22-Annular wing plate, 23-Stiffening plate, 24-Ventilation hole, 3-Beam end installation gap, 4-Central installation gap, 5-Side restraint ring sealing plate, 51-Central shaft hole, 52-Fixing plate, 53-Side insert rib, 54-Mortise, 6-Restraint cover plate, 61-Side panel plate, 62-Back cover plate, 63-Cover insert rib, 64-Tenon, 7-Central sealing steel plate, 71-Limiting pad, 72-Bolt hole, 73-Main plate, 8-High-strength bolt, 9-Double nut pad assembly, 91-Padded block, 92-Nut, 10-Frame column. Detailed Implementation

[0055] See the examples. Figure 24-31 As shown, a modular prefabricated steel box girder connection system includes steel box girders 1 to be connected on the left and right sides, and frame columns 10 on both sides. The steel box girder 1 to be connected consists of corbels and long beams 11 connected to the frame columns. The corbels are short beams 12 with the same specifications as the long beams 11.

[0056] The two ends of the long beam 11 are connected to the short beams 12 on both sides by a modular prefabricated steel box girder connection system, see [link / reference]. Figure 1-8 As shown, each connection system includes two beam-embedded constraint steel end plates 2 arranged opposite to each other. Each includes an embedded part 21 and an annular wing plate 22. The embedded part 21 is embedded from the connection end of the corresponding side steel box girder 1. The annular wing plate 22 is located outside the corresponding side steel box girder 1 and extends outward from the outer contour of the connection end. A beam end installation gap 3 is reserved between the annular wing plate 22 and the connection end of the corresponding side steel box girder 1. A central installation gap 4 is reserved between the two annular wing plates 22.

[0057] In this embodiment, see Figure 5-8As shown, the embedded part 21 is the inner frame plate of the vertical annular wing plate 22. The outer wall of the inner frame plate is adapted to and fits the inner wall size of the steel box girder 1. The reserved hole of the annular wing plate 22 is adapted to the inner wall size of the inner frame plate. A stiffening plate 23 is also provided inside the inner frame plate, and an exhaust hole 24 is opened in the center of the stiffening plate 23.

[0058] The steel box girder connection end contacts the inner wall of the steel box girder 1 through the embedded part, which restricts the relative displacement and rotation between the exposed annular wing plates 22, and affects the relative displacement and rotation of the embedded part, thereby restricting the relative displacement and rotation between the butt joints of the steel box girder connection end.

[0059] The connection system also includes a steel restraint assembly around the beam, restraining the portion of the annular flange 22 extending out of the steel box girder 1, including side restraint ring seal plates 5 respectively set on the front and rear sides, see [link / reference]. Figure 9-11 As shown, the side constraint ring sealing plate 5 seals the beam end installation gap 3 on both sides and constrains the two annular wing plates 22 on the same side. The side constraint ring sealing plate 5 includes a fixing plate 52 that is annularly fitted with the two annular wing plates 22 on the same side. The central shaft hole 51 is a rectangular hole set on the fixing plate 52. The height of the central shaft hole 51 is adapted to the height of the two annular wing plates 22 on the same side. The width of the central shaft hole 51 is based on the fit of the two annular wing plates 22 on the same side. The outer surface of the fixing plate 52 is flush with the outer surface of the two annular wing plates 22 on the same side.

[0060] See also Figure 16-21 As shown, the steel restraint assembly around the beam also includes restraint cover plates 6 set on the upper and lower sides respectively. The restraint cover plates 6 seal the beam end installation gaps 3 on the upper and lower sides and restrain the two annular wing plates 22 on the same side. The end connection between the side restraint ring sealing plate 5 and the restraint cover plate 6 is connected by mortise and tenon joints.

[0061] The fixing plate 52 has a side rib 53 extending inward along the inner wall edge of the central hole 51 at the beam end installation gap 3. The side rib 53 is inserted into the beam end installation gap 3 and its end face is in contact with the outer wall of the inner frame plate. The height of the side rib 53 is adapted to the height of the inner frame plate. The fixing plate 52 has a mortise 54 at the position corresponding to the constraint cover plate 6. The shape of the mortise 54 is adapted to the cross-section of the constraint cover plate 6. The distance between the mortise 54 between the two side constraint ring sealing plates 5 is adapted to the length of the constraint cover plate 6.

[0062] The cross-section of the constraint cover plate 6 is U-shaped, including a side plate 61 and a back cover plate 62. The thickness of the side plate 61 is greater than the beam end installation gap 3. The inner side of the side plate 61 is provided with a cover insert rib 63 extending out of the side plate 61 at the position corresponding to the beam end installation gap 3. The inside angle formed by the cover insert rib 63 and the side plate 61 is adapted to the outside angle of the edge of the steel box girder 1. The U-shaped groove is fastened to the top or bottom outside of the two annular wing plates 22 on the same side and the central sealing steel plate 7. The cover insert rib 63 is inserted into the beam end installation gap 3 and its end face is in contact with the outer wall of the inner frame plate and the corresponding side surface of the side insert rib 53.

[0063] The length of the constraint cover plate 6 is greater than the width of the steel box girder 1, and the two ends form tenons 64. The tenons 64 are inserted into the mortises 54 on the front and rear sides and connected by tenons and mortises.

[0064] See also Figure 12-15 As shown in Figures 22-23, the connection system also includes a central sealing steel plate 7, which is inserted between two annular wing plates 22 along the front and rear sides to seal the central installation gap 4. The front and rear ends of the central sealing steel plate 7 pass outward through the central shaft hole 51 of the side constraint ring sealing plate 5. One end of the central sealing steel plate 7 is provided with a limiting pad 71 that snaps onto the outer side of the same side constraint ring sealing plate 5, and the other end is provided with a bolt hole 72 and is fixed by a high-strength bolt 8 and a double nut pad assembly 9.

[0065] The central sealing steel plate 7 includes a plate 73, the height of which is adapted to the height of the central shaft hole 51. A limiting pad 71 is fixedly connected to one end face of the plate 73, the height of which is adapted to the height of the central shaft hole 51, and the width is not less than the width of the central shaft hole 51. Bolt holes 72 are arranged in rows at the other end of the plate 73. High-strength bolts 8 are arranged in rows corresponding to the bolt holes 72. Double nut pad assembly 9 is arranged on both sides of the central sealing steel plate 7, including two pads 91 and two nuts 92. The thickness of the pad 91 is greater than the thickness of the side insert rib 53, and the width of the pad 91 is not greater than the width of the central sealing steel plate 7 extending out of the same side restraint ring sealing plate 5. The high-strength bolts 8 pass through the two ends of the bolt holes 72, pass through the pads 91 respectively, and are anchored by the nuts 92.

[0066] The construction method and steps for this modular prefabricated steel box girder connection system are as follows: Step 1: Based on the dimensions of the steel box girder 1 to be connected, design the dimensions of each component of the modular prefabricated steel box girder connection system and process them in the factory. Specifically, the embedded restraint steel end plate 2 on the short girder side is pre-welded to the short girder 12 during factory processing. The embedded restraint steel end plate 2 on the long girder side is embedded within the girder without a fixed connection, exhibiting an adjustable telescopic mode. The embedded restraint steel end plate 2 on the long girder side functions as an adjustable telescopic mode during the hoisting of the long girder 11, its purpose being to reserve a certain positioning gap to facilitate the placement of the long girder 11 on the construction site.

[0067] Step two: Before installing the long beam 11, the verticality of the frame columns 10 on both sides is corrected to ensure that the clearance between the two frame columns 10 meets the installation requirements of the long beam 11; the embedded restraint steel end plates 2 at both ends of the long beam 11 are completely compressed into the beam to leave sufficient space for the long beam 11 to be installed in place. See [link to relevant documentation]. Figure 24 As shown.

[0068] Step 3: Hoist the long beam 11 into position, pull out the embedded restraint steel end plate 2, and adjust the installation gap 3 between the annular wing plate 22 and the beam end of the long beam 11 to meet the design requirements. (See [link]) Figure 25-27 As shown.

[0069] Step 4: Install the side constraint ring sealing plate 5 on one side to limit the annular wing plate 22 on that side and make the installation gap 3 at the beam end on that side tight.

[0070] Step 5: Insert the central sealing steel plate 7 to seal the central installation gap 4. Secure the limiting pad 71 to the outside of the side restraint ring sealing plate 5 from Step 4. (See attached image) Figure 28 As shown.

[0071] Step six, install constraint cover plate 6. The constraint cover plate 6 has an upper cover plate and a lower cover plate, which makes the top and bottom of the long beam 11 and the short beam 12 tightly sealed. One end of the constraint cover plate 6 is mortised and tenoned with the side constraint ring sealing plate 5 in step four.

[0072] Step 7: Install the side constraint ring sealing plate 5 on the other side, limiting the annular wing plate 22 on that side and ensuring the installation gap 3 at the beam end of that side is sealed. Simultaneously, limit the constraint cover plate 6, i.e., the other end of the constraint cover plate 6 is tenon-and-mortise connected to the side constraint ring sealing plate 5 in this step. At this point, the central sealing steel plate 7 passes through the central shaft hole 51 of the side constraint ring sealing plate 5 in this step and exposes the bolt hole 72. This achieves a tight installation gap between the nodes, enabling load transfer. See [link to relevant documentation]. Figures 29-30 As shown.

[0073] Step 8: High-strength bolts 8 are passed through bolt holes 72, and spacers 91 are passed through both ends and anchored with nuts 92. This limits and fixes the side constraint ring sealing plate 5, restricting the displacement between components. Under load, the components interact and restrain each other, forming a unified load-bearing unit. The long beam 11 and short beam 12 are then connected, completing the final prefabricated beam-column joint construction. See [link / reference]. Figures 31-32 As shown.

Claims

1. A modular prefabricated steel box girder connection system, characterized in that, include: Steel box girders to be connected on the left and right sides (1); Two beams are arranged opposite each other with embedded steel end plates (2). Each includes an embedded part (21) and an annular wing plate (22). The embedded part (21) is inserted from the connection end of the corresponding side steel box beam (1). The annular wing plate (22) is located outside the corresponding side steel box beam (1) and extends outward from the outer contour of the connection end. A beam end installation gap (3) is reserved between the annular wing plate (22) and the connection end of the corresponding side steel box beam (1). A central installation gap (4) is reserved between the two annular wing plates (22). The steel components surrounding the beam constrain the portion of the annular wing plate (22) extending out of the steel box girder (1), including side constraining ring sealing plates (5) respectively set on the front and rear sides. The side constraining ring sealing plates (5) block the beam end installation gaps (3) on the front and rear sides and constrain the two annular wing plates (22) on the same side. It also includes constraining cover plates (6) respectively set on the upper and lower sides. The constraining cover plates (6) block the beam end installation gaps (3) on the upper and lower sides and constrain the two annular wing plates (22) on the same side. The end connection between the side constraining ring sealing plates (5) and the constraining cover plates (6) limits each other. The central sealing steel plate (7) is inserted between two annular wing plates (22) along the front and rear sides to seal the central installation gap (4). The front and rear ends of the central sealing steel plate (7) pass outward through the central shaft hole (51) of the side constraint ring sealing plate (5). One end of the central sealing steel plate (7) is provided with a limiting pad (71) that snaps onto the outer side of the same side constraint ring sealing plate (5), and the other end is provided with a bolt hole (72) and is limited and fixed by a high-strength bolt (8) and a double nut pad assembly (9).

2. The modular prefabricated steel box girder connection system according to claim 1, characterized in that: The inner part (21) is the inner frame plate of the vertical annular wing plate (22). The outer wall of the inner frame plate is adapted to and fits the inner wall size of the steel box girder (1). The reserved hole of the annular wing plate (22) is adapted to the inner wall size of the inner frame plate.

3. The modular prefabricated steel box girder connection system according to claim 2, characterized in that: The inner frame plate is also provided with a stiffening plate (23), and the stiffening plate (23) has an exhaust hole (24) in the center.

4. The modular prefabricated steel box girder connection system according to claim 2, characterized in that: The side restraint ring sealing plate (5) includes a fixing plate (52) that is annularly fitted with two annular wing plates (22) on the same side. The central shaft hole (51) is a rectangular hole set on the fixing plate (52). The height of the central shaft hole (51) is adapted to the height of the two annular wing plates (22) on the same side. The width of the central shaft hole (51) is based on the fit of the two annular wing plates (22) on the same side. The outer surface of the fixing plate (52) is flush with the outer surface of the two annular wing plates (22) on the same side.

5. The modular prefabricated steel box girder connection system according to claim 4, characterized in that: The fixing plate (52) is provided with a side insert rib (53) extending inward along the inner wall edge of the central hole (51) at the position of the beam end installation gap (3). The side insert rib (53) is inserted into the beam end installation gap (3) and its end face is in contact with the outer wall of the inner frame plate. The height of the side insert rib (53) is adapted to the height of the inner frame plate. The fixing plate (52) is provided with a mortise (54) at the position of the constraint cover plate (6). The shape of the mortise (54) is adapted to the cross-section of the constraint cover plate (6). The distance between the mortise (54) between the two side constraint ring sealing plates (5) is adapted to the length of the constraint cover plate (6).

6. The modular prefabricated steel box girder connection system according to claim 5, characterized in that: The cross-section of the constraint cover plate (6) is U-shaped, including a side plate (61) and a back cover plate (62). The thickness of the side plate (61) is greater than the beam end installation gap (3). The inner side of the side plate (61) is provided with a cover insert rib (63) extending out of the side plate (61) at the position corresponding to the beam end installation gap (3). The inside corner formed by the cover insert rib (63) and the side plate (61) is adapted to the outside corner of the edge of the steel box girder (1). The U-shaped groove is fastened to the top or bottom outside of the two annular wing plates (22) on the same side and the central sealing steel plate (7). The cover insert rib (63) is inserted into the beam end installation gap (3) and the end face is in contact with the outer wall of the inner frame plate and the corresponding side surface of the side insert rib (53).

7. The modular prefabricated steel box girder connection system according to claim 6, characterized in that: The length of the constraint cover plate (6) is greater than the width of the steel box girder (1), and the two ends form tenons (64). The tenons (64) are inserted into the mortises (54) on the front and rear sides and are connected by tenons and mortises.

8. The modular prefabricated steel box girder connection system according to claim 4 or 6, characterized in that: The central sealing steel plate (7) includes the plate (73), the height of which is adapted to the height of the central shaft hole (51). The limiting pad (71) is fixedly connected to one side end face of the plate (73), the height of which is adapted to the height of the central shaft hole (51), and the width is not less than the width of the central shaft hole (51). The bolt holes (72) are arranged in rows at the other end of the plate (73), and the high-strength bolts (8) are arranged in rows one-to-one with the bolt holes (72). Correspondingly, the double nut pad assembly (9) is set on both sides of the central sealing steel plate (7), including two pads (91) and two nuts (92). The thickness of the pad (91) is greater than the thickness of the side insert rib (53), and the width of the pad (91) is not greater than the width of the central sealing steel plate (7) extending out of the same side restraint ring sealing plate (5). The high-strength bolt (8) passes through the two ends of the bolt hole (72), passes through the pad (91) respectively, and is anchored by the nut (92).

9. The modular prefabricated steel box girder connection system according to claim 8, characterized in that: It also includes the frame columns (10) on both sides, the steel box beam (1) to be connected is the corbel and long beam (11) connected on the frame column, and the corbel is a short beam (12) with the same specifications as the long beam (11).

10. A construction method for a modular prefabricated steel box girder connection system according to claim 9, characterized in that, The construction steps are as follows: Step 1: Based on the dimensions of the steel box girder (1) to be connected, design the dimensions of each component of the modular prefabricated steel box girder connection system and process them in the factory. The embedded restraint steel end plate (2) on the short beam side is pre-welded to the short beam (12) during factory processing. The embedded restraint steel end plate (2) on the long beam side is embedded in the beam without fixed connection and is in an adjustable telescopic mode. Step 2: Before installing the long beam (11), the verticality of the frame columns (10) on both sides is corrected, and the clearance between the two frame columns (10) is controlled to meet the installation requirements of the long beam (11); the embedded steel end plates (2) at both ends of the long beam (11) are completely compressed into the beam to leave enough space for the long beam (11) to be installed in place. Step 3: Hoist the long beam (11) into place, pull out the embedded restraint steel end plate (2) of the beam, and adjust the beam end installation gap (3) between the annular wing plate (22) and the long beam (11) to meet the design requirements; Step 4: Install the side restraint ring sealing plate (5) on one side, limit the annular wing plate (22) on that side, and make the installation gap (3) at the beam end on that side tight; Step 5: Insert the central sealing steel plate (7) to seal the central installation gap (4), and secure the limiting pad (71) to the outside of the side constraint ring sealing plate (5) in step 4. Step 6, install the constraint cover plate (6), the upper cover plate and the lower cover plate of the constraint cover plate (6) are respectively, so that the top and bottom of the long beam (11) and the short beam (12) are tightly sealed, and one end of the constraint cover plate (6) is mortised and tenoned with the side constraint ring sealing plate (5) in step 4. Step 7: Install the side restraint ring sealing plate (5) on the other side, limit the annular wing plate (22) on this side and make the installation gap (3) at the beam end of this side tight, and limit the restraint cover plate (6) at the same time. That is, the other end of the restraint cover plate (6) is mortised and tenoned with the side restraint ring sealing plate (5) in this step. At this time, the central sealing steel plate (7) passes through the central shaft hole (51) of the side restraint ring sealing plate (5) in this step and exposes the bolt hole (72). Step 8: Pass high-strength bolts (8) through bolt holes (72), and pass pads (91) through both ends and anchor them with nuts (92) so that each component forms an integral load-bearing unit under load. The long beam (11) and short beam (12) are connected.

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