A steel jump plate manned platform for repairing the bridge bottom of a combined road and rail bridge and a construction method thereof

Abstract

The application discloses a steel jump plate manned platform for repairing the bridge bottom of a highway-railway combined bridge and a construction method thereof, and relates to the technical field of bridge repairing. The steel jump plate manned platform comprises an inclined ladder structure, the two ends of the inclined ladder structure are respectively provided with a head structure and a bottom structure, the head structure is used for overlapping flange plates, the bottom structure is used for clamping guardrails on both sides of an inspection walkway, and the bottom of the inclined ladder structure is movably connected to the bottom structure. The application further discloses a construction method of the steel jump plate manned platform. The steel jump plate manned platform is arranged on the top of the guardrails of the inspection walkway, the bottom structure is arranged to be clamped on the guardrails on both sides of the inspection walkway, the inclined ladder structure is elongated upwards and the height of the head structure is leveled with the bottom of the flange plate, the bottom of the inclined ladder structure is moved relative to the bottom structure, and the head structure is fixed on the flange plate. The application aims to provide a steel jump plate manned platform for repairing the bridge bottom of a highway-railway combined bridge, which does not need to rely on additional equipment, is convenient and fast to install and disassemble, and occupies a small space.

Description

Technical Field

[0001] This application relates to the field of bridge repair technology, specifically to a steel scaffolding platform for repairing the underside of a dual-purpose road-rail bridge and its construction method. Background Technology

[0002] Currently, in the reinforcement and repair of dual-purpose road and rail bridges, when carrying out the task of repairing defects at the bottom of the bridge, it is generally necessary to install a load-bearing platform on the underside of the defect repair area so that workers can carry out the repair work on the defects that appear.

[0003] like Figure 1 As shown, according to conventional solutions, the boom can be installed at the flange plate 101, and a crossbeam can be installed at the lower end of the boom to overlap the guardrail of the inspection walkway 102 to form a protective platform on the outside of the main truss, allowing construction workers to move and carry out construction on the platform.

[0004] However, conventional solutions have the following drawbacks during construction:

[0005] ① The installation of the hangers on the outer protective platform of the main truss requires the use of an additional bridge inspection vehicle to place construction personnel under the flange plate 101 for installation, which is inconvenient and consumes a lot of time and manpower, which has a significant impact on projects with tight schedules; ② The installation of the outer protective platform of the main truss is inconvenient, and the dismantling after completion also requires a lot of manpower and time; ③ The outer protective platform of the main truss occupies a relatively large space, which may affect subsequent work. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this application is to provide a steel scaffolding platform for repairing the bottom of a dual-purpose road-rail bridge, which does not require additional equipment, is easy and quick to install and disassemble, and occupies little space.

[0007] To achieve the above objectives, the technical solution adopted is: a steel scaffolding platform for repairing the bottom of a dual-purpose road-rail bridge. The steel scaffolding platform includes a retractable inclined ladder structure. The two ends of the inclined ladder structure are respectively provided with a head structure and a bottom structure. The head structure is used to connect the flange plate, and the bottom structure is used to hold the guardrails on both sides of the inspection walkway. The bottom of the inclined ladder structure is movably connected to the bottom structure.

[0008] Based on the above technical solution, the inclined ladder structure includes two thin square steel inclined rods, two thick square steel inclined rods, and several angle steel treads. The two thin square steel inclined rods are arranged in parallel and spaced apart, and the bottom of the thin square steel inclined rods can be retractably inserted into the thick square steel inclined rods. The two ends of the angle steel treads are respectively vertically fixed to the thin square steel inclined rods or the thick square steel inclined rods, and the several angle steel treads are arranged at intervals to form a ladder.

[0009] Based on the above technical solution, the inclined ladder structure also includes several thin square steel crossbars, the angle steel treads are set on the top surface of the thin square steel inclined bar or the thick square steel inclined bar, and the thin square steel crossbars are vertically fixed to the side end faces of the two thin square steel inclined bars.

[0010] Based on the above technical solution, the head structure includes a strip-shaped square steel stabilizing rod. Two horizontally spaced clamping steel plates are provided on the side of the square steel stabilizing rod facing the flange plate. The side of the square steel stabilizing rod away from the flange plate is fixed to a thin square steel diagonal rod. One of the clamping steel plates is provided with a tightenable bolt, and the two clamping steel plates and the bolt are used to clamp and fix the bottom of the flange plate.

[0011] Based on the above technical solution, a transition steel plate is vertically arranged between the square steel stabilizing rod and the two clamping steel plates. The two clamping steel plates are vertically welded to one side of the transition steel plate, and the square steel stabilizing rod is welded to the other side of the transition steel plate. Furthermore, a reinforcing triangular steel plate is arranged between the outer right angle of the square steel stabilizing rod and the transition steel plate, and between the outer right angle of the clamping steel plate and the transition steel plate.

[0012] Based on the above technical solution, the bottom structure includes two parallel thin square steel horizontal bars, and four channel steels for holding and inspecting the top of the walkway are provided at the bottom of the two thin square steel horizontal bars.

[0013] Each of the two thin square steel horizontal bars is fitted with a movable thick square steel sleeve bar, and the bottom end of the thick square steel diagonal bar is fixed to the thick square steel sleeve bar; several thin square steel reinforcing bars are vertically installed between the two thin square steel horizontal bars, and wire mesh is laid on the top surface of all the thin square steel reinforcing bars.

[0014] This application also discloses a construction method for the aforementioned steel scaffolding manned platform, comprising the following steps:

[0015] The steel scaffolding platform is placed on top of the guardrail of the inspection walkway, and the bottom structure is secured to the guardrails on both sides of the inspection walkway.

[0016] The inclined ladder structure extends upwards and makes the height of the head structure level with the bottom of the flange plate. The length of the inclined ladder structure is fixed by a clamp.

[0017] The bottom of the inclined ladder structure moves relative to the bottom structure, so that the head structure overlaps the flange plate, and the bottom of the inclined ladder structure and the bottom structure 2 are fixed by clamps;

[0018] The head structure is fixed to the flange.

[0019] Based on the above technical solution, the inclined ladder structure includes two thin square steel inclined rods, two thick square steel inclined rods, and several angle steel treads. The two thin square steel inclined rods are arranged in parallel and spaced apart, and the bottom of the thin square steel inclined rods can be retractably inserted into the thick square steel inclined rods. The two ends of the angle steel treads are respectively vertically fixed to the thin square steel inclined rods or the thick square steel inclined rods, and the several angle steel treads are arranged at intervals to form a ladder.

[0020] The upward extension of the inclined ladder structure and the length of fixing the inclined ladder structure include:

[0021] The thin square steel diagonal bar is extended or contracted to a suitable length relative to the thick square steel diagonal bar;

[0022] Use clamps to secure the thin square steel diagonal brace and the thick square steel diagonal brace.

[0023] Based on the above technical solution, the head structure includes a strip-shaped square steel stabilizing rod. Two horizontally spaced clamping steel plates are provided on the side of the square steel stabilizing rod facing the flange plate. The side of the square steel stabilizing rod away from the flange plate is fixed to a thin square steel diagonal rod. One of the clamping steel plates is provided with a tightenable bolt.

[0024] The head structure is fixed to the flange and includes:

[0025] Tighten the bolts to clamp and secure the bottom of the flange between the two clamping steel plates.

[0026] Based on the above technical solution, the bottom structure includes two parallel thin square steel horizontal bars, and four channel steels for holding and inspecting the top of the walkway are provided at the bottom of the two thin square steel horizontal bars.

[0027] Each of the two thin square steel horizontal bars is fitted with a movable thick square steel sleeve bar, and the bottom end of the thick square steel diagonal bar is fixed to the thick square steel sleeve bar; several thin square steel reinforcing bars are vertically installed between the two thin square steel horizontal bars, and the top surface of all the thin square steel reinforcing bars is covered with wire mesh.

[0028] The bottom of the inclined ladder structure moves relative to the bottom structure, including:

[0029] The thick square steel sleeve moves along the thin square steel horizontal bar, causing the inclined ladder structure and the head structure to move.

[0030] The beneficial effects of the technical solution provided in this application include:

[0031] The steel scaffolding platform of this application features a simple structure and low cost. It utilizes an extendable or retractable inclined ladder structure, with the bottom of the ladder structure movable relative to the base structure, facilitating easy installation and connection between the flange plate and the guardrail of the inspection walkway. Installation is convenient and efficient. This steel scaffolding platform is easy to manufacture and use, saves materials, can be mounted on flange plates of varying heights, and is easy to disassemble and install. The entire steel scaffolding platform bypasses the original design's process of placing construction workers under the flange plate to build the platform and then moving them to the platform via the inspection walkway. Construction workers can directly mount the platform on the inspection walkway for construction, which is convenient and quick, requiring no additional equipment. Installation and disassembly are convenient and quick, and it occupies little space, significantly shortening the construction cycle. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the flange plate, inspection walkway, and defect area of ​​a conventional road-rail bridge.

[0034] Figure 2 This is a front view of the steel scaffolding manned platform provided in an embodiment of this application;

[0035] Figure 3 A top view of the steel scaffolding manned platform provided in the embodiments of this application;

[0036] Figure 4 This is a front view of the head structure of the steel scaffold manned platform provided in an embodiment of this application;

[0037] Figure 5 A side view of the head structure of the steel scaffolding manned platform provided in an embodiment of this application;

[0038] Figure 6 Side view of the bottom structure provided in an embodiment of this application;

[0039] Figure 7 Bottom structure plan view provided for embodiments of this application;

[0040] Figure 8 A schematic diagram of the first construction step of installing a steel scaffolding manned platform according to an embodiment of this application;

[0041] Figure 9 A schematic diagram of the second construction step of installing a steel scaffolding manned platform according to an embodiment of this application;

[0042] Figure 10 A schematic diagram of the third construction step of installing the steel scaffolding manned platform provided in the embodiments of this application;

[0043] Reference numerals: 100, Steel scaffolding platform; 101, Flange plate; 102, Inspection walkway; 103, Defect area; 1, Head structure; 2, Bottom structure; 3, Thin square steel diagonal bar; 4, Thin square steel horizontal bar; 5, Angle steel step; 11, Square steel stabilizing bar; 12, Clamping steel plate; 13, Triangular steel plate; 14, Transition steel plate; 21, Thin square steel horizontal bar; 22, Coarse square steel diagonal bar; 23, Thin square steel reinforcing bar; 24, Channel steel; 25, Coarse square steel sleeve bar. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] like Figures 1 to 10 As shown, this application discloses an embodiment of a steel scaffolding manned platform for repairing the underside of a dual-purpose road-rail bridge.

[0046] The steel scaffolding platform includes a retractable inclined ladder structure that can be extended or shortened according to actual needs. A head structure 1 and a bottom structure 2 are respectively provided at both ends of the inclined ladder structure. The head structure 1 is used to overlap and connect the flange plate 101, and the bottom structure 2 is used to hold the guardrails on both sides of the inspection walkway 102. The bottom of the inclined ladder structure is movably connected to the bottom structure 2. Specifically, the defect area 103 is located directly above the inclined ladder structure.

[0047] The steel scaffolding platform of this application has a simple structure and low cost. The platform utilizes an extendable or retractable inclined ladder structure, and the bottom of the inclined ladder structure is movable relative to the bottom structure 2, facilitating installation between the flange plate 101 and the guardrail of the inspection walkway 102. Installation is convenient and efficient. This steel scaffolding platform is easy to manufacture and use, can be mounted on flange plates of different heights, and is easy to disassemble and install.

[0048] In one embodiment, the inclined ladder structure includes two thin square steel diagonal rods 3, two thick square steel diagonal rods 22, and several angle steel treads 5. The two thin square steel diagonal rods 3 are arranged in parallel and spaced apart, and the bottom of the thin square steel diagonal rods 3 is retractable and insertable into the thick square steel diagonal rods 22. In actual use, the thin square steel diagonal rods 3 can be lengthened or shortened relative to the thick square steel diagonal rods 22 as needed. The two ends of the angle steel treads 5 are respectively vertically fixed to the thin square steel diagonal rods 3 or the thick square steel diagonal rods 22, and the several angle steel treads 5 are arranged at intervals to form a ladder, which facilitates maintenance and construction by construction personnel.

[0049] Furthermore, the inclined ladder structure also includes several thin square steel crossbars 4, and angle steel steps 5 are set on the top surface of the thin square steel inclined bars 3 or the thick square steel inclined bars 22. The thin square steel crossbars 4 are vertically fixed to the side end faces of the two thin square steel inclined bars 3, which strengthens the strength of the entire inclined ladder structure and improves the stability of the steel scaffolding platform.

[0050] In one embodiment, the head structure 1 includes a strip-shaped square steel stabilizing rod 11, and two horizontally spaced clamping steel plates 12 are provided on the side of the square steel stabilizing rod 11 facing the flange plate 101. The two clamping steel plates 12 are used to clamp and fix the flange plate 101.

[0051] The square steel stabilizing rod 11 is fixed to the inclined ladder structure on the side away from the flange plate 101. Specifically, the side of the square steel stabilizing rod 11 away from the flange plate 101 is fixed to the thin square steel inclined rod 3. Of the two clamping steel plates 12, one of the clamping steel plates 12 is provided with a tightenable bolt, and the two clamping steel plates 12 and the bolt are used to clamp and fix the bottom of the flange plate 101.

[0052] In one embodiment, a transition steel plate 14 is vertically arranged between the square steel stabilizing rod 11 and the two clamping steel plates 12. The two clamping steel plates 12 are vertically welded to one side of the transition steel plate 14, and the square steel stabilizing rod 11 is welded to the other side of the transition steel plate 14. Furthermore, a reinforced triangular steel plate 13 is arranged between the outer right angle of the square steel stabilizing rod 11 and the transition steel plate 14, and between the outer right angle of the clamping steel plate 12 and the transition steel plate 14, further enhancing the stability of the steel scaffolding platform.

[0053] Preferably, both the clamping steel plate 12 and the transition steel plate 14 are made of 5mm steel plates.

[0054] In one embodiment, the bottom structure 2 includes two parallel thin square steel horizontal bars 21. At the bottom of the two thin square steel horizontal bars 21, four channel steels 24 are provided for holding the top of the inspection walkway 102. The channel steels 24 are used to hold the entire steel scaffold platform to the top of the guardrail.

[0055] Each of the two thin square steel horizontal bars 21 is fitted with a movable thick square steel sleeve bar 25. The length of the two thin square steel horizontal bars 21 spans between the guardrails, while the thick square steel sleeve bar 25 is only a short section. The bottom end of the thick square steel diagonal bar 22 is fixed to the thick square steel sleeve bar 25. Several thin square steel reinforcing bars 23 are vertically installed between the two thin square steel horizontal bars 21, and the top surface of all the thin square steel reinforcing bars 23 is covered with wire mesh.

[0056] In actual use, the thin square steel diagonal bar 3 can be extended or shortened relative to the thick square steel diagonal bar 22, and the thick square steel sleeve bar 25 can move relative to the thin square steel horizontal bar 21. By adjusting these two positions, it is possible to mount the bridge bottom flange that deviates from the site position, and to flexibly and efficiently form a stable steel scaffolding platform for construction operations.

[0057] This application also discloses a construction method for the aforementioned steel scaffolding manned platform, comprising the following steps:

[0058] The steel scaffolding platform 100 is pre-fabricated and assembled according to the relative positions of the flange plate 101 and the inspection walkway 102. The steel scaffolding platform 100 is placed on top of the guardrail of the inspection walkway 102, with the bottom structure 2 secured to the guardrails on both sides of the inspection walkway 102. Simultaneously, the bottom structure 2 and the guardrails are firmly connected by bolts on the sides. At this point, the inclined ladder structure is shortened to its minimum length for easy transportation.

[0059] The inclined ladder structure extends upwards and makes the height of the head structure 1 level with the bottom of the flange plate 101. The length of the inclined ladder structure is fixed by a clamp, so that the inclined ladder structure cannot extend or retract freely.

[0060] The bottom of the inclined ladder structure moves relative to the bottom structure 2, so that the head structure 1 overlaps the flange plate 101. The bottom of the inclined ladder structure and the bottom structure 2 are fixed by clamps so that the two cannot move relative to each other.

[0061] The head structure 1 is fixed to the flange plate 101.

[0062] The construction method of the steel scaffolding platform for carrying workers in this application involves first fixing the bottom structure 2 of the steel scaffolding platform 100 to the guardrail of the inspection walkway 102, and then adjusting the length of the inclined ladder structure and the relative position of the bottom of the inclined ladder structure with respect to the bottom structure 2 to support the bridge bottom flange that deviates from the site position, thus forming a stable inclined steel scaffolding platform to support workers for construction operations, which can adapt to complex site conditions.

[0063] In one embodiment, the inclined ladder structure includes two thin square steel diagonal rods 3, two thick square steel diagonal rods 22, and several angle steel treads 5. The two thin square steel diagonal rods 3 are arranged in parallel and spaced apart, and the bottom of the thin square steel diagonal rods 3 is retractable and insertable into the thick square steel diagonal rods 22. In actual use, the thin square steel diagonal rods 3 can be lengthened or shortened relative to the thick square steel diagonal rods 22 as needed. The two ends of the angle steel treads 5 are respectively vertically fixed to the thin square steel diagonal rods 3 or the thick square steel diagonal rods 22, and the several angle steel treads 5 are arranged at intervals to form a ladder, which facilitates maintenance and construction by construction personnel.

[0064] The upward extension of the inclined ladder structure and the length of fixing the inclined ladder structure include:

[0065] The thin square steel diagonal bar 3 is extended or retracted to a suitable length relative to the thick square steel diagonal bar 22;

[0066] The thin square steel diagonal bar 3 and the thick square steel diagonal bar 22 are fixed with clamps so that they can no longer move relative to each other.

[0067] In one embodiment, the head structure 1 includes a strip-shaped square steel stabilizing rod 11, and two horizontally spaced clamping steel plates 12 are provided on the side of the square steel stabilizing rod 11 facing the flange plate 101. The two clamping steel plates 12 are used to clamp and fix the flange plate 101.

[0068] The square steel stabilizing rod 11 is fixed to the inclined ladder structure on the side away from the flange plate 101. Specifically, the side of the square steel stabilizing rod 11 away from the flange plate 101 is fixed to the thin square steel inclined rod 3. Of the two clamping steel plates 12, one of the clamping steel plates 12 is provided with a tightenable bolt, and the two clamping steel plates 12 and the bolt are used to clamp and fix the bottom of the flange plate 101.

[0069] The head structure 1 is fixed to the flange plate 101 and includes:

[0070] Tighten the bolts to clamp and fix the bottom of the flange 101 between the two clamping steel plates 12.

[0071] In one embodiment, the bottom structure 2 includes two parallel thin square steel horizontal bars 21. At the bottom of the two thin square steel horizontal bars 21, four channel steels 24 are provided for holding the top of the inspection walkway 102. The channel steels 24 are used to hold the entire steel scaffold platform to the top of the guardrail.

[0072] Each of the two thin square steel horizontal bars 21 is fitted with a movable thick square steel sleeve bar 25. The length of the two thin square steel horizontal bars 21 spans between the guardrails, while the thick square steel sleeve bar 25 is only a short section. The bottom end of the thick square steel diagonal bar 22 is fixed to the thick square steel sleeve bar 25. Several thin square steel reinforcing bars 23 are vertically installed between the two thin square steel horizontal bars 21, and the top surface of all the thin square steel reinforcing bars 23 is covered with wire mesh.

[0073] The bottom of the inclined ladder structure moves relative to the bottom structure 2, including:

[0074] The thick square steel sleeve rod 25 moves along the thin square steel horizontal rod 21, causing the inclined ladder structure and the head structure 1 to move.

[0075] The construction method of the steel scaffolding manned platform of this application requires no additional equipment, is easy and quick to install and disassemble, occupies little space, and greatly shortens the construction period.

[0076] The steel scaffolding platform for personnel utilizes an extendable or retractable inclined ladder structure, and the bottom of the inclined ladder structure is movable relative to the bottom structure 2, facilitating easy installation and connection between the flange plate 101 and the guardrail of the inspection walkway 102. Installation is convenient and efficient. The construction method of the steel scaffolding platform of this application is simple to manufacture and use, saves materials, can be mounted on flange plates of different heights, and is easy to disassemble and install. The entire steel scaffolding platform bypasses the original design process of placing construction personnel under the flange plate to build the platform and then moving them to the platform via the inspection walkway. Construction personnel can directly mount the platform on the inspection walkway for construction, which is convenient and quick.

[0077] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0078] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0079] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A steel scaffolding platform for repairing the underside of a dual-purpose road-rail bridge, characterized in that: The steel scaffolding platform includes a retractable inclined ladder structure. The two ends of the inclined ladder structure are respectively provided with a head structure (1) and a bottom structure (2). The head structure (1) is used to overlap the flange plate (101). The bottom structure (2) is used to hold the guardrails on both sides of the inspection walkway (102). The bottom of the inclined ladder structure is movably connected to the bottom structure (2). The inclined ladder structure includes two thin square steel inclined rods (3), two thick square steel inclined rods (22), and several angle steel treads (5). The two thin square steel inclined rods (3) are arranged in parallel and spaced apart, and the bottom of the thin square steel inclined rods (3) can be telescopically inserted into the thick square steel inclined rods (22). The two ends of the angle steel treads (5) are respectively vertically fixed to the thin square steel inclined rods (3) or the thick square steel inclined rods (22), and several angle steel treads (5) are arranged at intervals to form a ladder. The head structure (1) includes a strip-shaped square steel stabilizing rod (11). Two horizontally spaced clamping steel plates (12) are provided on the side of the square steel stabilizing rod (11) facing the flange plate (101). The side of the square steel stabilizing rod (11) away from the flange plate (101) is fixed to a thin square steel diagonal rod (3). One of the clamping steel plates (12) is provided with a tightenable bolt, and the two clamping steel plates (12) and the bolt are used to clamp and fix the bottom of the flange plate (101). A transition steel plate (14) is vertically arranged between the square steel stabilizing rod (11) and the two clamping steel plates (12). The two clamping steel plates (12) are vertically welded to one side of the transition steel plate (14), and the square steel stabilizing rod (11) is welded to the other side of the transition steel plate (14). A reinforcing triangular steel plate (13) is arranged between the outer right angle of the square steel stabilizing rod (11) and the transition steel plate (14), and between the outer right angle of the clamping steel plate (12) and the transition steel plate (14). The bottom structure (2) includes two parallel thin square steel horizontal bars (21), and four channel steels (24) for holding the top of the inspection walkway (102) are provided at the bottom of the two thin square steel horizontal bars (21); a movable thick square steel sleeve rod (25) is provided on each of the two thin square steel horizontal bars (21), and the bottom end of the thick square steel diagonal bar (22) is fixed to the thick square steel sleeve rod (25); several thin square steel reinforcing rods (23) are vertically arranged between the two thin square steel horizontal bars (21), and wire mesh is laid on the top surface of all the thin square steel reinforcing rods (23).

2. The steel scaffolding platform for repairing the underside of a dual-purpose road-rail bridge as described in claim 1, characterized in that: The inclined ladder structure also includes several thin square steel crossbars (4), the angle steel treads (5) are set on the top surface of the thin square steel inclined bar (3) or the thick square steel inclined bar (22), and the thin square steel crossbars (4) are vertically fixed to the side end faces of the two thin square steel inclined bars (3).

3. A construction method for a steel scaffolding manned platform as described in claim 1, characterized in that, Includes the following steps: The steel scaffolding platform (100) is placed on top of the guardrail of the inspection walkway (102), and the bottom structure (2) is straddled and held by the guardrails on both sides of the inspection walkway (102). The inclined ladder structure extends upward and makes the height of the head structure (1) level with the bottom of the flange plate (101), and the length of the inclined ladder structure is fixed by a clamp. The bottom of the inclined ladder structure moves relative to the bottom structure (2), so that the head structure (1) overlaps the flange plate (101), and the bottom of the inclined ladder structure and the bottom structure (2) are fixed by clamps; The head structure (1) is fixed to the flange plate (101).

4. The construction method of the steel scaffolding manned platform as described in claim 3, characterized in that: The upward extension of the inclined ladder structure and the length of fixing the inclined ladder structure include: The thin square steel diagonal bar (3) is extended or retracted to a suitable length relative to the thick square steel diagonal bar (22); Secure the thin square steel diagonal bar (3) and the thick square steel diagonal bar (22) with clamps.

5. The construction method of the steel scaffolding manned platform as described in claim 4, characterized in that: The head structure (1) is fixed to the flange plate (101) and includes: Tighten the bolts to clamp and fix the bottom of the flange (101) between the two clamping steel plates (12).

6. The construction method of the steel scaffolding manned platform as described in claim 4, characterized in that: The bottom of the inclined ladder structure moves relative to the bottom structure (2), including: The thick square steel sleeve rod (25) moves along the thin square steel horizontal rod (21), driving the inclined ladder structure and the head structure (1) to move.

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