A bolted butt joint platform for steel beam construction and a construction method

Abstract

The application discloses a bolted butt joint platform for steel beam construction and a construction method, and belongs to the technical field of steel beam segment construction. The bolted butt joint platform for steel beam construction comprises the following: an upper chord beam construction platform covering a top flat link node and an upper chord beam butt joint seam area, and used for top flat link and upper chord beam high bolt construction work; a lower chord beam construction platform covering a lower chord beam butt joint seam area, and used for lower chord beam high bolt construction work; and a diagonal beam construction platform covering a diagonal beam node butt joint seam area, and used for diagonal beam high bolt construction work. The upper chord beam construction platform, the lower chord beam construction platform and the diagonal beam construction platform are all factory prefabricated steel components, are assembled and fixed to the outside of the steel beam through a high-strength bolt full bolt connection mode, and assist in steel beam segment assembly butt joint construction. The bolted mode is used to install the construction platforms on the steel beam, reduces damage to the main body structure and the anticorrosive coating of the steel beam, and facilitates construction turnover.

Description

Technical Field

[0001] This invention relates to the field of steel beam segment construction technology, specifically to a bolted connection platform and construction method for steel beam construction. Background Technology

[0002] During the prefabricated construction of large-span steel truss bridges, the splicing of steel beam segments requires the assistance of an aerial work platform. The construction platform covers different construction areas such as the top horizontal bracing of the steel beam, the chord joint, and the diagonal joint, providing working space for high-altitude and high-bolt construction. In the traditional construction mode, the steel beam supporting work platform is usually temporarily erected on the construction site, or the platform components are welded and fixed to the outside of the steel beam members on site. After the erection is completed, a temporary working surface is formed by relying on the platform's guardrails and scaffold boards. Construction workers can reach the various node positions through simple ladders to complete the steel beam segment splicing operation. The temporary platform is then dismantled after the main structure of the bridge is completed. It is an indispensable temporary auxiliary facility in the prefabricated construction of steel truss bridges.

[0003] For example, patent CN120592115A discloses a construction method for a steel beam operating platform and a steel arch operating platform spanning a river, which includes the following steps: S1, installing temporary supports in the water; S2, installing a longitudinal bridge-direction worker walkway on the longitudinal connecting beam of the temporary supports for workers to walk on; S3, installing a tie beam docking operating platform at the tie beam docking point; installing a middle cross beam docking platform on both sides of the middle cross beam for welding and painting the bridge deck unit to the upper flange of the middle cross beam; S4, installing a ladder to the top plate of the steel arch before hoisting the steel arch segment; S5, installing a steel arch operating platform on the steel arch to facilitate the operation of workers. This operating platform facilitates the movement of workers and also includes a rest platform to prevent workers from becoming fatigued from climbing up and down, ensuring safety and reliability.

[0004] However, some existing welded fixed construction platforms are constructed using on-site welding. The high temperature of welding can easily burn and damage the factory-pre-installed anti-corrosion coating on the steel beams, damaging the steel beam base material. Afterwards, a large amount of additional manpower is required to grind and reapply anti-corrosion treatment to the weld scars and damaged areas of the coating. The process is cumbersome and the quality of anti-corrosion repair is difficult to guarantee. In addition, the welded platform is a non-disassembled integrated structure. Dismantling requires flame cutting, which further damages the steel beam members. The platform components after cutting are severely deformed and cannot be reused. This results in high material waste and high construction costs.

[0005] To address the aforementioned issues, there is an urgent need for innovative design based on the existing steel beam docking platform. Summary of the Invention

[0006] The purpose of this invention is to provide a bolted connection platform and construction method for steel beam construction, in order to solve the problems mentioned in the background art. The existing partially welded fixed construction platform adopts on-site welding, which is prone to burns and damages the factory-pre-set anti-corrosion coating of the steel beam due to the high temperature of welding, and damages the steel beam base material. Afterwards, a lot of additional manpower is required to grind and reapply anti-corrosion treatment to the weld scars and damaged areas of the coating. The process is cumbersome and the quality of anti-corrosion repair is difficult to guarantee. In addition, the welded platform is a non-disassembled integrated structure. When dismantling, flame cutting is required. The cutting operation will further damage the steel beam members. The platform components after cutting are severely deformed and cannot be reused. The material loss is large and the construction cost is high.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a bolted connection platform for steel beam construction, comprising: The upper chord construction platform covers the top horizontal bracing node of the steel beam and the joint area of ​​the upper chord, providing a space for the construction of the top horizontal bracing and the upper chord high bolts.

[0008] The lower chord construction platform covers the joint area of ​​the lower chord and is used for the construction of high bolts on the lower chord.

[0009] The inclined bracing construction platform covers the joint area of ​​the inclined bracing nodes, providing a platform for the construction of inclined bracing high bolts.

[0010] The upper chord construction platform, lower chord construction platform, and diagonal member construction platform are all prefabricated steel components in the factory. They are assembled and fixed to the outside of the steel beam by high-strength bolts to assist in the assembly and docking of steel beam segments.

[0011] The upper chord construction platform and the lower chord construction platform are symmetrically bolted together at both ends of the steel beam segment joint. After the two segments are connected, the platforms at both ends are bolted together to form a continuous working surface. The inclined member construction platform is bolted and fixed to the outside of the inclined member node of the steel beam through a clamp structure.

[0012] Vertical ladders are fixed to the main steel beams by high-strength bolts. The vertical ladders connect the upper chord construction platform, the lower chord construction platform, and the inclined beam construction platform, allowing workers to move up and down.

[0013] Preferably, the upper chord construction platform is a hanging basket type platform, including a cantilever beam assembly, a hanging basket frame, and a scaffolding platform. The cantilever beam assembly is made of channel steel and is fixed to the outside of the web of the upper chord of the steel beam by high-strength bolts. The hanging basket frame is fixed to the cantilever beam assembly by high-strength bolts. Two sets of hanging basket frames are installed on the outside of the upper chord of the steel beam, and the scaffolding platform is detachably bolted to the hanging basket frame.

[0014] Preferably, the scaffolding platform is a double-layer working platform, including an upper platform and a lower platform; the upper platform covers the top surface of the top horizontal connecting member of the steel beam, and the lower platform covers the joint area of ​​the web of the upper chord. The upper platform and the lower platform are fixed together by bolts, which allows for the construction of high bolts at different positions of the top horizontal connecting member and the upper chord.

[0015] Preferably, the lower chord construction platform and the upper chord construction platform adopt the same hanging basket structure. The lower chord construction platform is fixed to the outside of the lower chord by high-strength bolts and is symmetrically arranged along the joint of the lower chord, which can completely cover the splicing end face of the lower chord.

[0016] Preferably, the inclined beam construction platform is a clamp-type hanging basket platform, including an inclined beam clamp and a cantilever hanging basket; the inclined beam clamp surrounds and fits the outer wall of the inclined beam member of the steel beam, and the clamp is locked by multiple sets of high-strength bolts to achieve docking and fixation; the cantilever hanging basket is assembled above the inclined beam clamp by high-strength bolts to form the working surface of the inclined beam node of the steel beam.

[0017] Preferably, the upper chord construction platform, lower chord construction platform, and inclined bar construction platform are all equipped with guardrails, with toe boards at the bottom of the guardrails, and a safety net can be suspended below the platform to prevent people or objects from falling.

[0018] Preferably, edge guardrails are installed at the positions of the upper chord and lower chord, and the edge guardrails reuse the permanent protective railings of the bridge.

[0019] Preferably, the vertical ladder is equipped with a protective back cage. The lower end of the vertical ladder is connected to the construction area of ​​the lower chord, the middle part is connected to the construction platform of the diagonal member, and the upper end reaches the construction platform of the upper chord. During construction, the vertical ladder and the temporary steel beam members are reinforced by rope binding. The vertical ladder is bolted and fixed to the steel beam in the factory and hoisted simultaneously.

[0020] Preferably, the upper chord construction platform, lower chord construction platform, diagonal construction platform, and vertical ladder all adopt a detachable fully bolted structure. After the steel beam segments are joined and the bridge deck is constructed, the platform can be separated from the steel beam by removing the connecting bolts of each component. The upper chord construction platform, lower chord construction platform, and diagonal construction platform are dismantled using a 35t truck crane on the lower bridge deck. After dismantling, only the bolt holes remain on the steel beam, with no welding scars. The surface of the steel beam at the original installation location is ground and then coated with anti-corrosion paint. All platform components can be reused.

[0021] A construction method for steel beams, using the aforementioned bolted connection platform for steel beam construction, the construction method for the connection platform includes the following steps: S1. Factory prefabrication and pre-assembly: The upper chord construction platform, lower chord construction platform, diagonal construction platform, and vertical ladder are fabricated and pre-assembled in the factory. They are then transported and hoisted to the bridge construction area as a whole along with the steel beam segments.

[0022] S2. Steel beam segment hoisting and docking: The pre-assembled steel beam segments are hoisted into place using lifting equipment. The upper chord construction platform and lower chord construction platform at both ends of the docking joint of two adjacent steel beam segments are spliced ​​together by high-strength bolts to form a continuous integral working surface covering the docking joint. The diagonal brace construction platform is positioned synchronously with the diagonal brace and is locked and fixed to the diagonal brace node with clamps.

[0023] S3. High-altitude construction operations: Construction workers use vertical ladders with back cages to access each operating platform and sequentially complete the installation of high-strength bolts for the top horizontal bracing, upper and lower chords, and diagonal joints. During construction, ropes are used to bind and reinforce the vertical ladders to the temporary steel beams. Platform guardrails and bottom safety nets are installed throughout the entire process.

[0024] S4. Bridge main structure construction: After completing the high-bolt connection of all steel beam segments, bridge deck paving construction will commence.

[0025] S5. Platform dismantling and anti-corrosion repair: After the bridge deck construction is completed, a 35t truck crane on the lower bridge deck is used to dismantle the high-strength bolts of each platform and vertical ladder in sequence, separate all the docking platform components, grind the surface of the original platform bolting position on the steel beam, apply anti-corrosion coating, and collect all the dismantled platform components for reuse in subsequent steel beam construction.

[0026] Compared with the prior art, the beneficial effects of the present invention are: This invention adopts a bolted assembly method, in which the various components of the platform and the platform and steel beam members are connected and fixed by high-strength bolts. This avoids the problems of high-temperature burning, damage to the original anti-corrosion coating of the steel beam, and damage to the steel beam base material caused by traditional welding platforms. Only bolt holes are reserved on the steel beam, and only simple grinding and anti-corrosion coating are required later. This simplifies the anti-corrosion repair process, ensures the integrity of the overall anti-corrosion system of the steel beam, and improves the durability of the bridge.

[0027] The upper chord construction platform, lower chord construction platform, inclined member construction platform, and vertical ladder are all detachable bolted prefabricated components. After the bridge construction is completed, only the connecting bolts need to be removed to complete the overall dismantling of the platform. No flame cutting is required, and no secondary damage will be caused to the steel beam members. The dismantled platform components are free from deformation and burn damage, and can be uniformly stored and reused multiple times, reducing the consumption of steel structure materials, reducing the processing cost of temporary construction platforms, and improving the economic benefits of the project.

[0028] The upper chord construction platform, lower chord construction platform, and diagonal member construction platform are prefabricated and pre-assembled in the factory. They are transported as a whole with the steel beam segments and hoisted to the bridge site simultaneously. This eliminates a large number of welding and assembly processes on the construction site, reduces the amount of high-altitude welding work and the safety hazards of high-altitude hot work. At the same time, the upper and lower chord platforms adopt a symmetrical double-layer hanging basket structure. After the two segments are connected, they can be spliced ​​to form a complete and continuous working surface, which covers the construction area of ​​the top horizontal connector and chord joint at one time. There is no need to change and erect the platform multiple times, which effectively shortens the on-site assembly period and improves the efficiency of steel truss prefabricated construction.

[0029] The steel beams are equipped with specialized vertical ladders with protective back cages, which can connect all working areas of the lower chord, diagonal members, and upper chord. During construction, the ladders are reinforced with ropes and temporary steel beam members, ensuring high stability for passage. Each construction platform is equipped with guardrails, toe boards, and bottom safety nets. The permanent guardrails of the bridge can be reused in the upper and lower chord areas. The combination of multiple safety protection structures reduces the risk of falling objects and personnel falling from heights, and improves the safety of high-altitude and high-bolt construction operations. Attached Figure Description

[0030] Figure 1 This is a front view structural diagram of the upper chord construction platform, lower chord construction platform, and diagonal member construction platform of the present invention.

[0031] Figure 2 This is a side view of the upper chord construction platform, lower chord construction platform, and inclined bar construction platform of the present invention.

[0032] Figure 3 This is a front view structural diagram of the hanging basket frame of the present invention.

[0033] Figure 4 This is a side view of the hanging basket frame structure of the present invention.

[0034] Figure 5 This is a schematic diagram of the three-dimensional structure of the hanging basket frame of the present invention.

[0035] Figure 6 This is a side view schematic diagram of the cantilever hanging basket structure of the present invention.

[0036] Figure 7 This is a schematic diagram of the three-dimensional structure of the cantilever hanging basket of the present invention.

[0037] Figure 8 This is a flowchart of the present invention.

[0038] In the diagram: 1. Upper chord construction platform; 11. Cantilever beam assembly; 12. Hanging basket frame; 13. Scaffolding platform; 131. Upper platform; 132. Lower platform; 2. Lower chord construction platform; 3. Diagonal brace construction platform; 31. Diagonal brace clamp; 32. Cantilever hanging basket; 4. Vertical ladder; 5. Edge guardrail. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1: Please refer to Figure 1 and Figure 2 The present invention provides the following technical solution: a bolted connection platform for steel beam construction, comprising: an upper chord construction platform 1, covering the top horizontal connection node and the upper chord connection joint area of ​​the steel beam, for high-bolt construction of the top horizontal connection and the upper chord; a lower chord construction platform 2, covering the lower chord connection joint area, for high-bolt construction of the lower chord; and a diagonal member construction platform 3, covering the diagonal member node connection joint area, for high-bolt construction of the diagonal member; the upper chord construction platform 1, the lower chord construction platform 2, and the diagonal member construction platform 3 are all prefabricated steel components in the factory and are fully bolted with high-strength bolts. The connection method is used to assemble and fix the steel beam to the outside, assisting in the assembly and docking of steel beam segments; the upper chord construction platform 1 and the lower chord construction platform 2 are symmetrically bolted together at both ends of the steel beam segment docking joint. After the two segments are docked, the two end platforms are bolted and spliced ​​to form an integral continuous working surface. The inclined bar construction platform 3 is bolted and fixed to the outside of the inclined bar node of the steel beam through a clamp structure; the steel beam body is bolted and fixed with a vertical ladder 4 by high-strength bolts. The vertical ladder 4 connects the upper chord construction platform 1, the lower chord construction platform 2 and the inclined bar construction platform 3 respectively, allowing workers to go up and down.

[0041] During the prefabrication stage of the steel beam in the factory, the upper chord construction platform 1, lower chord construction platform 2, diagonal member construction platform 3, and vertical ladder 4 are all assembled one by one using high-strength bolts. After processing, the upper chord construction platform 1 is symmetrically bolted to both sides of the upper chord joint of the steel beam, the lower chord construction platform 2 is symmetrically bolted to both sides of the lower chord joint of the steel beam, the diagonal member construction platform 3 is locked and fixed to the outside of the diagonal member node of the steel beam by a clamp structure, and the vertical ladder 4 with protective back cage is bolted and fixed to the web of the steel beam. After all components are pre-assembled, they are transported to the bridge site along with the steel beam.

[0042] After the two steel beams are hoisted and spliced, the corresponding upper chord construction platforms 1 and lower chord construction platforms 2 on the two adjacent steel beams are locked together with butt bolts to form a complete working surface (the two adjacent upper chord construction platforms 1 or lower chord construction platforms 2 are distributed laterally to form the bottom area of ​​the hanging basket frame 12 of the upper chord construction platform 1 or lower chord construction platform 2. The two adjacent hanging basket frames 12 are reinforced and connected with high-strength bolts, and the adjacent upper chord construction platforms 1 or lower chord construction platforms 2 at both ends are quickly locked together to form a complete working surface). Construction personnel can reach the lower chord construction platform 2, the diagonal construction platform 3, and the upper chord construction platform 1 respectively along the vertical ladder 4, and complete the high-strength bolt tightening operation of each part of the steel beam in sequence. The entire platform is assembled, connected and fixed by bolts alone, reducing the damage to the steel beam base material and the original anti-corrosion coating.

[0043] Please see Figure 3 and Figure 4 The upper chord construction platform 1 is a hanging basket type platform, including a cantilever beam assembly 11, a hanging basket frame 12, and a scaffolding platform 13. The cantilever beam assembly 11 is made of channel steel and is fixed to the outside of the web of the upper chord of the steel beam by high-strength bolts. The hanging basket frame 12 is fixed to the cantilever beam assembly 11 by high-strength bolts. Two sets of hanging basket frames 12 are installed on the outside of the upper chord of the steel beam. The scaffolding platform 13 is detachably bolted to the hanging basket frame 12.

[0044] The cantilever beam assembly 11, made of channel steel, has multiple sets of bolt holes pre-drilled. After fitting against the outer side of the web of the upper chord of the steel beam, high-strength bolts are inserted to lock and fix it. A set of hanging basket frames 12 is arranged on each side of the butt joint of a single steel beam. The two sets of hanging basket frames 12 are locked to the cantilever beam assembly 11 horizontally and vertically by multiple bolts. The scaffold platform 13 is an independent prefabricated steel scaffold unit. The unit has pre-drilled installation holes around its perimeter. On-site, the scaffold platform 13 only needs to be aligned with the connection point at the bottom of the hanging basket frame 12 and the bolts screwed in to complete the assembly. During disassembly, the scaffold platform 13 and the hanging basket frame 12 can be separated simply by unscrewing the bolts in the opposite direction. The disassembly and assembly are convenient and do not require cutting or welding.

[0045] Please see Figure 3 and Figure 4 The scaffold platform 13 is a double-layer working platform, including an upper platform 131 and a lower platform 132. The upper platform 131 covers the top surface of the top horizontal bracing member of the steel beam, and the lower platform 132 covers the butt joint area of ​​the web of the upper chord. The upper platform 131 and the lower platform 132 are fixed together by bolts to allow for the construction of high bolts at different positions of the top horizontal bracing and the upper chord.

[0046] The upper platform 131 and the lower platform 132 are both prefabricated independently. A vertical connecting square steel is set between the two platforms. The upper and lower ends of the square steel are aligned with the edges of the upper platform 131 and the lower platform 132, respectively. High-strength bolts are used to lock the two platforms and the vertical square steel to form an integral double-layer working structure.

[0047] The top surface of the upper platform 131 is flush with the top surface of the top horizontal connecting member of the steel beam. Construction workers can stand on the upper platform 131 to complete the bolt tightening work of the top horizontal connecting member. The lower platform 132 is close to the outer side of the web of the upper chord of the steel beam, and the connecting bolts on the side and bottom of the upper chord can be directly constructed. The two platforms can work simultaneously without adjusting the platform position, and fully cover all construction points of the upper chord.

[0048] Please see Figure 1 and Figure 2 The lower chord construction platform 2 and the upper chord construction platform 1 adopt the same hanging basket structure. The lower chord construction platform 2 is fixed to the outside of the lower chord by high-strength bolts and is symmetrically arranged along the joint of the lower chord, which can completely cover the splicing end face of the lower chord.

[0049] The lower chord construction platform 2 is equipped with a channel steel cantilever beam assembly 11, a square steel hanging basket frame 12, and a double-layer scaffolding platform 13, all of which are of the same specifications as the upper chord construction platform 1. During factory pre-assembly, the cantilever beam assembly 11 is attached to the lower web of the lower chord of the steel beam and locked in place with vertical high-strength bolts. A set of lower chord construction platforms 2 is arranged at each end of the butt joint of a single lower chord. After the two sets of platforms are spliced ​​together, they completely cover the upper, lower, left, and right splicing ends of the lower chord. Construction personnel can complete the full circumferential high-strength bolt installation of the lower chord at multiple locations on the platform. The structure is standardized and can be interchanged with the upper chord platform for processing and reuse.

[0050] Please see Figure 5 The inclined beam construction platform 3 is a clamp-type hanging basket platform, including an inclined beam clamp 31 and a cantilever hanging basket 32. The inclined beam clamp 31 surrounds and fits the outer wall of the inclined beam member of the steel beam, and the clamp is locked by multiple sets of high-strength bolts to achieve docking and fixation. The cantilever hanging basket 32 ​​is assembled above the inclined beam clamp 31 by high-strength bolts to form the working surface of the inclined beam node of the steel beam.

[0051] The diagonal clamps 31 are symmetrically arranged on the outside of the diagonal members of the steel beam. The two symmetrical diagonal clamps 31 are fixed together by high-strength bolts. After tightening the bolts, the diagonal clamps 31 and the cantilever basket 32 ​​are locked to the outside of the diagonal member. The cantilever basket 32 ​​extends outward to form a horizontal working platform, which completely covers the area of ​​the diagonal member node connection plate. Construction workers can complete the high-bolt construction of the entire diagonal member node by standing inside the cantilever basket 32. The clamp structure can be adapted to steel beam diagonal members with different cross-sectional dimensions.

[0052] Please see Figure 1 - Figure 5The upper chord construction platform 1, the lower chord construction platform 2, and the inclined bar construction platform 3 are all equipped with guardrails. The bottom of the guardrails is equipped with toe boards, and a safety net can be hung under the platform to prevent people or objects from falling.

[0053] Each platform's guardrails are prefabricated square steel frames. Bolt holes are pre-drilled at the bottom of the guardrail posts, which are then bolted to the edge points of the hanging basket frame 12 and the cantilever hanging basket 32, respectively. The height of the guardrails meets the safety specifications for high-altitude construction. Steel toe plates are arranged along the entire length of the platform at the bottom of the guardrails to prevent tools, bolts, and other small materials from slipping off.

[0054] The bottom frames of the upper chord construction platform 1, lower chord construction platform 2, and inclined bar construction platform 3 have reserved hanging points, which can be used to hang nylon safety nets on site. The safety nets cover the entire high-altitude area below the platform, forming a multi-layer protection system to avoid the safety hazards of falling objects from heights and people falling from heights. All railings, toe boards, and safety net hanging points are installed with bolts for easy removal and are not fixed by welding.

[0055] Please see Figure 1 and Figure 2 Edge guardrails 5 are installed at the positions of the upper and lower chords, and edge guardrails 5 are reused as permanent protective railings of the bridge.

[0056] Please see Figure 1 and Figure 2 The vertical ladder 4 is equipped with a protective back cage. The lower end of the vertical ladder 4 is connected to the construction area of ​​the lower chord, the middle part is connected to the construction platform 3 of the diagonal rod, and the upper end is directly connected to the construction platform 1 of the upper chord. During the construction process, the vertical ladder 4 is reinforced with the temporary steel beam members by rope binding. The vertical ladder 4 is bolted and fixed to the steel beam in the factory and hoisted at the same time.

[0057] The vertical ladder 4 is equipped with an enclosed metal protective cage. The ladder steps and cage frame are assembled in the factory using bolts. The bottom of the ladder extends to the lower chord construction platform 2, and the middle is reserved to connect to the diagonal brace construction platform 3. The top is connected to the upper chord construction platform 1. When working at height on site, steel wire ropes and nylon ropes are used to bind and fix the ladder cage to the temporary stiffening members of the steel beam at multiple points to improve the ladder's anti-sway performance. The entire ladder is pre-assembled and bolted in the steel beam factory and is hoisted to the bridge site along with the steel beam, eliminating the need to erect the ladder at height on site.

[0058] Please see Figure 1 - Figure 5The upper chord construction platform 1, lower chord construction platform 2, diagonal construction platform 3, and vertical ladder 4 all adopt a detachable fully bolted structure. After the steel beam segments are joined and the bridge deck is constructed, the connecting bolts of each component can be removed to separate the platform from the steel beam. The upper chord construction platform 1, lower chord construction platform 2, and diagonal construction platform 3 are dismantled using a 35t truck crane on the lower bridge deck. After dismantling, only the bolt holes remain on the steel beam, with no welding scars. The surface of the steel beam at the original installation location is ground and then coated with anti-corrosion paint. All platform components can be reused.

[0059] During the dismantling of the upper chord construction platform 1, lower chord construction platform 2, diagonal construction platform 3, and vertical ladder 4, the high-strength bolts of each part were loosened in sequence, and the connections between the cantilever beam assembly 11, diagonal clamp 31, hanging basket frame 12, and vertical ladder 4 and the steel beam were disassembled. During the dismantling stage, a 35t truck crane arranged on the lower bridge deck was used to lift each platform unit and ladder component to the ground. Only evenly distributed bolt holes were left on the steel beam members. Only a small grinding equipment was used to lightly grind around the bolt holes, and then a uniform anti-corrosion primer and topcoat were applied. All dismantled steel components were free from deformation and burn damage. After being classified and stored, they can be transferred to the next batch of steel beam prefabrication projects for repeated assembly and use, which greatly reduces the processing cost of temporary steel structures.

[0060] Example 2: Please refer to Figure 6 Based on Example 1, a construction method for a steel beam is also disclosed. The construction method for the docking platform includes the following steps: S1. Factory prefabrication and pre-assembly: Steel structural components such as upper chord construction platform 1, lower chord construction platform 2, inclined bar construction platform 3, and vertical ladder 4 are processed and manufactured separately, and pre-assembled in the factory. They are then transported and hoisted to the bridge construction area as a whole along with the steel beam segments.

[0061] S2. Steel beam segment hoisting and docking: The pre-assembled steel beam segments are hoisted into place using lifting equipment. The upper chord construction platform 1 and lower chord construction platform 2 at both ends of the docking joint of two adjacent steel beam segments are spliced ​​together by high-strength bolts to form a continuous integral working surface covering the docking joint. The diagonal brace construction platform 3 is positioned synchronously with the diagonal brace and is locked and fixed to the diagonal brace node with clamps.

[0062] S3. High-altitude construction operations: Construction workers use vertical ladders 4 with back cages to access each operating platform and sequentially complete the installation of high-strength bolts for the top horizontal bracing, upper and lower chords, and diagonal joints. During construction, ropes are used to bind and reinforce the vertical ladders 4 with temporary steel beam members. Platform guardrails and bottom safety nets are installed throughout the entire process.

[0063] S4. Bridge main structure construction: After completing the high-bolt connection of all steel beam segments, bridge deck paving construction will commence.

[0064] S5. Platform dismantling and anti-corrosion repair: After the bridge deck construction is completed, a 35t truck crane is used on the lower bridge deck to dismantle the high-strength bolts of each platform and vertical ladder 4 in sequence, separate all the docking platform components, grind the surface of the original platform bolting position on the steel beam, apply anti-corrosion coating, and collect all the dismantled platform components for reuse in subsequent steel beam construction.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0066] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bolted connection platform for steel beam construction, characterized in that, include: The upper chord construction platform (1) covers the top horizontal bracing node of the steel beam and the joint area of ​​the upper chord, for the construction of the top horizontal bracing and the upper chord high bolts; The lower chord construction platform (2) covers the lower chord joint area for the construction of the lower chord high bolts; The inclined bar construction platform (3) covers the joint area of ​​the inclined bar node and provides a high bolt construction operation for the inclined bar; The upper chord construction platform (1), the lower chord construction platform (2) and the diagonal brace construction platform (3) are all prefabricated steel components in the factory. They are assembled and fixed to the outside of the steel beam by high-strength bolts to assist in the assembly and docking of steel beam segments. The upper chord construction platform (1) and the lower chord construction platform (2) are symmetrically bolted together at both ends of the steel beam segment joint. After the two segments are connected, the platforms at both ends are bolted together to form an integral continuous working surface. The inclined bar construction platform (3) is bolted and fixed to the outside of the inclined bar node of the steel beam through a clamp structure. A vertical ladder (4) is fixed to the main body of the steel beam by high-strength bolts. The vertical ladder (4) connects the upper chord construction platform (1), the lower chord construction platform (2) and the inclined rod construction platform (3) respectively, so that workers can go up and down.

2. The bolted connection platform for steel beam construction according to claim 1, characterized in that: The upper chord construction platform (1) is a hanging basket platform, including a cantilever beam assembly (11), a hanging basket frame (12) and a scaffold platform (13). The cantilever beam assembly (11) is made of channel steel and is fixed to the outside of the web of the upper chord of the steel beam by high-strength bolts. The hanging basket frame (12) is fixed to the cantilever beam assembly (11) by high-strength bolts. Two sets of hanging basket frames (12) are installed on the outside of the upper chord of the steel beam. The scaffolding platform (13) is detachably bolted to the hanging basket frame (12).

3. The bolted connection platform for steel beam construction according to claim 2, characterized in that: The scaffolding platform (13) is a double-layer working platform, including an upper platform (131) and a lower platform (132). The upper platform (131) covers the top surface of the top horizontal bracing member of the steel beam, and the lower platform (132) covers the joint area of ​​the web of the upper chord. The upper platform (131) and the lower platform (132) are fixed together by bolts, which are used for the construction of high bolts at different positions of the top horizontal bracing member and the upper chord.

4. The bolted connection platform for steel beam construction according to claim 2, characterized in that: The lower chord construction platform (2) and the upper chord construction platform (1) adopt the same hanging basket structure. The lower chord construction platform (2) is fixed to the outside of the lower chord by high-strength bolts and is symmetrically arranged along the joint of the lower chord, which can completely wrap the splicing end face of the lower chord.

5. A bolted connection platform for steel beam construction according to claim 1, characterized in that: The inclined rod construction platform (3) is a clamp-type hanging basket platform, including an inclined rod clamp (31) and a cantilever hanging basket (32). The diagonal bracing (31) surrounds and fits the outer wall of the diagonal member of the steel beam, and is fixed by locking the bracing with multiple sets of high-strength bolts; The cantilever hanging basket (32) is assembled above the inclined rod clamp (31) by high-strength bolts to form the working surface of the steel beam inclined rod node.

6. A bolted connection platform for steel beam construction according to claim 1, characterized in that: The upper chord construction platform (1), lower chord construction platform (2) and inclined bar construction platform (3) are all equipped with guardrails. The bottom of the guardrails is equipped with toe boards. A safety net can be hung under the platform to prevent people or objects from falling.

7. A bolted connection platform for steel beam construction according to claim 1, characterized in that: The upper and lower chords are equipped with edge guardrails (5), which are reused as permanent protective railings of the bridge.

8. A bolted connection platform for steel beam construction according to claim 1, characterized in that: The vertical ladder (4) is equipped with a protective back cage. The lower end of the vertical ladder (4) is connected to the construction area of ​​the lower chord, the middle part is connected to the construction platform of the diagonal bar (3), and the upper end is directly connected to the construction platform of the upper chord (1). During construction, the vertical ladder (4) and the temporary steel beam members are reinforced by rope binding. The vertical ladder (4) is bolted and fixed to the steel beam in the factory and hoisted at the same time.

9. A bolted connection platform for steel beam construction according to claim 1, characterized in that: The upper chord construction platform (1), lower chord construction platform (2), inclined bar construction platform (3) and vertical ladder (4) all adopt a detachable fully bolted structure. After the steel beam segments are connected and the bridge deck is constructed, the platform and steel beam can be separated by removing the connecting bolts of each component. The upper chord construction platform (1), lower chord construction platform (2) and diagonal construction platform (3) were dismantled using a 35t truck crane on the lower bridge deck. After dismantling, only bolt holes remained on the steel beams, with no welding scars. The surface of the steel beams at the original installation locations was ground and then coated with anti-corrosion paint. All platform components can be reused.

10. A method for constructing a steel beam, employing a bolted connection platform for steel beam construction as described in any one of claims 1 to 9, characterized in that, The construction method for the docking platform includes the following steps: S1. Factory prefabrication and pre-assembly: The upper chord construction platform (1), lower chord construction platform (2), inclined bar construction platform (3), and vertical ladder (4) are processed and manufactured separately. The steel structure components are prefabricated in the factory and transported and hoisted to the bridge construction area along with the steel beam segments. S2, steel beam segment hoisting and docking: the pre-assembled steel beam segments are hoisted into place by lifting equipment. The upper chord construction platform (1) and lower chord construction platform (2) at both ends of the joint of two adjacent steel beam segments are spliced ​​by high-strength bolts to form a continuous overall working surface covering the joint. The inclined bar construction platform (3) is put into place synchronously with the inclined bar and is locked and fixed to the inclined bar node with a clamp. S3. High-altitude construction operations: Construction workers use vertical ladders (4) with back cages to access each operating platform and complete the installation of high-strength bolts for the top horizontal bracing, upper and lower chords, and diagonal bracing nodes in sequence. During the construction process, ropes are used to bind and reinforce the vertical ladders (4) with the temporary steel beam members. The platform guardrails and bottom safety nets are fully installed. S4. Bridge main structure construction: After completing the high-bolt connection of all steel beam segments, bridge deck paving construction will commence. S5. Platform dismantling and anti-corrosion repair: After the bridge deck construction is completed, the high-strength bolts of each platform and vertical ladder (4) are dismantled in sequence using a 35t truck crane on the lower bridge deck. All docking platform components are separated, and the original platform bolting positions on the steel beam are ground and coated with anti-corrosion coating. All dismantled platform components are collected and reused in subsequent steel beam construction.

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