Telescopic operation platform for widening cantilever arm of steel bridge

Abstract

The invention relates to the field of bridge construction, in particular to a telescopic operation platform for a widening cantilever arm of a steel bridge, which comprises a hanging part, a connecting part and a lower platform, the lower platform and the hanging part are arranged on the same side of the connecting part, and a mounting channel is arranged in the lower platform. According to the working platform, the mounting channel is arranged on the connecting part, the rail and the overhanging platform with the traveling wheels are arranged in the mounting channel and are driven by the driving mechanism arranged on the side of the connecting part to stretch out and draw back, and the effective working length of the working platform can be adjusted, so that the widths of different sections of the curve widening cantilever arm are flexibly matched, and the problem that the working coverage of a fixed-size platform is insufficient is solved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a telescopic working platform for a steel bridge with a variable-width cantilever arm. Background Technology

[0002] With the rapid development of urban bridge construction, steel structure bridges have been widely used due to their advantages such as convenient construction, lightweight structure, and flexible design. In modern steel bridge design, to meet the needs of non-motorized vehicles and pedestrians, cantilever structures are often used as supporting components for pedestrian walkways or non-motorized vehicle lanes. To further enhance the bridge's aesthetic appeal, some steel bridge cantilever structures are designed with a curved, widening form, meaning that the width of the cantilever gradually changes as the bridge extends longitudinally, creating a smooth visual shape.

[0003] However, during the segmented installation of such curved, widened cantilever jibs, numerous transverse butt welds are required, necessitating high-altitude operations such as welding, grinding, and painting. Currently, steel bridge cantilever jib construction often utilizes fixed-size work platforms. These platforms are typically simple in structure and fixed in size, unable to adapt to the varying construction space demands caused by changes in the cantilever jib width. In curved, widened cantilever jib construction, fixed-size platforms often cannot fully cover the work surface, forcing construction workers to frequently move or erect auxiliary platforms. This not only affects construction efficiency but also increases the safety risks associated with working at height.

[0004] Therefore, existing technologies suffer from the following prominent problems: fixed-size cantilever work platforms cannot adapt to construction conditions where the cantilever beam widens on curved sections, resulting in insufficient work coverage, low construction efficiency, and high safety risks. Currently, there is no dedicated work platform in this field that can flexibly adjust its length to adapt to changes in the cantilever beam width.

[0005] Therefore, there is an urgent need to develop a working platform that can extend and retract according to the width of the cantilever arm, so as to improve the adaptability, safety and construction efficiency of the widened cantilever arm construction of steel bridges. Summary of the Invention

[0006] The purpose of this invention is to overcome the technical problems in the prior art where fixed-size cantilever operation platforms cannot adapt to the construction of cantilevered bridges with widening curves, resulting in insufficient work coverage, low efficiency and high safety risks, and to provide a telescopic platform for cantilevered bridges with widening curves.

[0007] This invention provides a telescopic working platform for a steel bridge with a variable-width cantilever arm, comprising a suspension part, a connecting part, and a lower platform;

[0008] The lower platform and the suspension part are located on the same side of the connecting part, and the distance between the lower platform and the suspension part is greater than the maximum thickness of the cantilever arm; The lower platform is provided with an installation channel, which is arranged along the length of the lower platform; The installation channel is equipped with an extension platform and a drive mechanism. The bottom of the installation channel is equipped with a track for installing the extension platform, and the bottom of the extension platform is equipped with a running wheel adapted to the track. The drive mechanism is disposed between the extended platform and the connecting part, and is used to drive the extended platform to move along the track.

[0009] This invention discloses a telescopic working platform for a steel bridge with variable-width cantilever boom. In use, the suspension unit is straddled and fixed to the cantilever boom of the steel bridge, with the lower platform located below the cantilever boom. When it is necessary to adapt to cantilever boom sections of different widths for operation, the drive mechanism is operated to drive the extended platform to extend along the track in the installation channel within the lower platform, thereby adjusting the effective working length of the entire working platform to match the actual width of the cantilever boom, providing construction personnel with a stable and adjustable working surface.

[0010] Preferably, the drive mechanism includes a winch disposed in the installation channel, the winch being provided with a first wire rope, the first wire rope being connected to the extended platform.

[0011] This setup uses a winch to wind up and unwind the wire rope to directly pull the extended platform, providing a simple, centralized, and easy-to-control drive method that is convenient to implement and operate.

[0012] Preferably, the winch is further provided with a second wire rope, the lower platform is provided with a first fixed pulley at the end away from the connecting part, the extended platform is provided with a movable pulley group at the end near the connecting part, and the second wire rope is connected to the end of the lower platform after passing around the first fixed pulley and the movable pulley group.

[0013] This structure constitutes a labor-saving system with a movable pulley system. By setting up the movable pulley system, the traction force of the winch can be effectively amplified, or a smoother speed control can be achieved. Thus, a winch with a smaller power can drive the extended platform with a larger load, improving transmission efficiency and reducing equipment costs and energy consumption. At the same time, the direction of force of the second wire rope is changed by the first fixed pulley, and the extension of the extended platform is achieved by the winch located behind the extended platform. This layout has multiple advantages: First, it avoids the winch and its auxiliary mechanisms from moving significantly with the extended platform, making the position of the power unit relatively fixed, which is convenient for operation and maintenance; Second, it optimizes the overall weight distribution and structural compactness of the platform, reducing the number of power sources; Third, it provides convenience for operators to control the extension and retraction of the platform in a relatively safe area (near the connecting structure).

[0014] Preferably, the movable pulley group includes two movable pulleys, which are respectively disposed on both sides of the end of the extended platform.

[0015] By symmetrically arranging two movable pulleys on both sides of the end of the extended platform, the tension of the wire rope can be evenly distributed, ensuring that the extended platform is balanced during movement, effectively preventing the platform from tilting or getting stuck on the track, and ensuring the smoothness and reliability of the telescopic movement.

[0016] Preferably, the winch is provided with a first spool and a second spool, the diameter of the first spool is D, the diameter of the second spool is d, D=2d, the first wire rope is connected to the first spool, and the second wire rope is connected to the second spool.

[0017] By setting two pulleys with a diameter ratio of 2:1 and connecting them to different wire rope drive paths (direct traction and movable pulley block traction), the winding and unwinding speeds of the two wire ropes can be made to form a fixed ratio (e.g., 2:1) when the winch rotates on a single shaft. This design cleverly coordinates the speed relationship between the direct traction and the labor-saving traction system, ensuring the synchronous and stable movement of the extended platform under the combined drive.

[0018] Preferably, the installation channel is provided with a first crossbar and a second crossbar that are parallel to each other. The winch is set on the first crossbar, and the second crossbar is set between the extended platform and the first crossbar. A second fixed pulley is provided on the second crossbar corresponding to the position of the winch. A third fixed pulley is provided at the end of the second crossbar that connects to the lower platform. The second wire rope passes through the second fixed pulley, the third fixed pulley, the first fixed pulley and the movable pulley group in sequence.

[0019] By setting the first and second crossbars as structural supports and rationally arranging the second and third fixed pulleys, a clear and optimized bypass path is provided for the second wire rope. This structure can change the force transmission direction of the wire rope, avoid interference between the wire rope and the platform structure, reduce friction loss during the movement, and make the layout of the entire drive system more compact and orderly.

[0020] Preferably, the extended platform is provided with an extended guardrail at its end, and the lower platform is provided with a platform guardrail at its top. Several steel cable railings connect the extended guardrail and the platform guardrail.

[0021] This setup constitutes a continuous, enclosed side protection system. When the extended platform is in the extended position, the cable railings can form an effective flexible connection between the extended guardrail and the platform guardrail, providing uninterrupted lateral safety protection for construction workers and greatly reducing the risk of falls during high-altitude operations.

[0022] Preferably, the lower platform is provided with a baffle extending into the installation channel, and the end of the extended platform near the connecting part is provided with a limiting plate for abutting against the baffle.

[0023] When the extended platform extends to its limit position, the limiting plate abuts against the baffle, thereby effectively preventing the extended platform from overextending and detaching from the installation channel, ensuring the structural safety and reliability of the work platform during the extension and retraction process.

[0024] Preferably, the connecting part is provided with a pedestrian passage, which is arranged along the height direction of the connecting part.

[0025] A vertical pedestrian passage is set up inside the connection section, providing construction workers with a safe and convenient way to descend from the bridge deck (or superstructure) to the lower work platform, avoiding the risks of climbing outside and improving the efficiency and safety of personnel access.

[0026] Preferably, a plurality of climbing poles are provided on one side of the connecting part, and the plurality of climbing poles are arranged along the height direction of the connecting part.

[0027] Climbing poles, serving as auxiliary or alternative structures for pedestrian walkways, provide construction workers with clear and stable footholds and grips, further facilitating their ascent and descent at the connecting sections and enhancing the accessibility and convenience of the work platform.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a telescopic working platform for a steel bridge cantilever boom. By setting up an overall frame consisting of a suspension part, a connecting part and a lower platform, and making the distance between the lower platform and the suspension part greater than the maximum thickness of the cantilever boom, the working platform can be stably straddled and installed on the steel bridge cantilever boom, forming a complete working space below. 2. This invention provides a telescopic working platform for a steel bridge with a variable-width cantilever boom. By setting an installation channel in the lower platform and setting a track and an extended platform with driving wheels in the installation channel, and driving the extension and retraction by a drive mechanism set on the connecting part, the effective working length of the working platform can be adjusted, thereby flexibly matching the width of different sections of the curved variable-width cantilever boom, and solving the problem of insufficient working coverage of fixed-size platforms. 3. This invention provides a telescopic working platform for a steel bridge with a variable-width cantilever arm. By setting the drive mechanism between the extended platform and the connecting part, the operator can centrally control the extension and retraction of the platform from a relatively safe and convenient position without having to move with the extended platform, which improves the controllability and safety of the construction process, while making the power layout more compact. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of a telescopic working platform for a steel bridge with variable width cantilever (the state after the extended platform is extended). Figure 2This is a structural schematic diagram of a telescopic working platform for a steel bridge with variable width cantilever (the state after the external platform is removed). Figure 3 yes Figure 2 Enlarged view of area A in the middle; Figure 4 yes Figure 2 Enlarged view of area B in the middle; Figure 5 yes Figure 2 Enlarged view of area C; Figure 6 This is a schematic diagram of the structure of the extended platform described in this invention; Figure 7 Figure 6 Enlarged view of area D in the middle; Figure 8 This is a schematic diagram illustrating the telescopic principle of the extended platform described in this invention; Figure 9 This is a structural schematic diagram and a usage diagram of a telescopic working platform for a steel bridge with variable width cantilever arm according to the present invention; Marked in the image: 1-Suspension section, 11-Wheel caster, 2-Connecting section, 21-Pedestrian walkway, 22-Climbing pole, 3-Lower platform, 31-Installation passage, 32-Railway, 33-First fixed pulley, 34-First crossbar, 35-Second crossbar, 36-Second fixed pulley, 37-Third fixed pulley, 38-Platform guardrail, 39-Baffle, 4-Extended platform, 41-Traveling wheel, 42-Moving pulley block, 421-Moving pulley, 43-Extended guardrail, 44-Cable railing, 45-Limiting plate, 5-Drive mechanism, 51-Windmill, 511-First sheave, 512-Second sheave, 52-First wire rope, 53-Second wire rope, 6-Bridge cantilever. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0031] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0032] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0033] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0034] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0035] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0036] Example 1 like Figure 1 As shown, a telescopic working platform for a steel bridge with variable-width cantilever includes a suspension part 1, a connecting part 2, and a lower platform 3. The suspension part 1 is a frame structure, which greatly reduces its weight while ensuring strength. It is equipped with casters 11 at the bottom for moving on the bridge surface. The connecting part 2 is a frame structure, which forms a pedestrian passage 21 inside for construction workers to pass up and down. At the same time, several climbing poles 22 are arranged at equal intervals on its side. The suspension part 1 and the lower platform 3 are located on the same side of the connecting part 2, and the distance between them is greater than the maximum thickness of the bridge cantilever 6, ensuring that there is sufficient construction space on the lower platform 3; like Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the lower platform 3 is a frame structure with a platform plate on top, forming an installation channel 31 inside. Two parallel tracks 32 are laid on the installation channel 31. An extended platform 4, movable along the tracks 32, is mounted on the tracks 32. The bottom of the extended platform 4 has wheels 41 adapted to the tracks 32. A drive mechanism 5 is located at one end of the installation channel 31 near the connecting part 2. The drive mechanism 5 includes a winch 51, with a first wire rope 52 and a second wire rope 53 mounted on it. The winch 51 is connected to the extended platform 4 via the first wire rope 52. The forward rotation of the winch 51 drives the extended platform 4 to move towards the connecting part 2. A first fixed pulley 33 is set at the end of the lower platform 3 away from the connecting part 2, and a movable pulley group 42 is set at the end of the extended platform 4 near the connecting part 2. The second wire rope 53 passes through the first fixed pulley 33 and the movable pulley group 42 in sequence and is connected to the end of the lower platform 3. The connection point and the first fixed pulley 33 are located on the two sides of the extended platform 4, respectively. The reverse rotation of the winch 51 drives the second wire rope 53 to wind around the winch 51. During the retraction process of the second wire rope 53, the extended platform 4 is pushed outward.

[0037] In optional implementations, such as Figure 6 and Figure 8 As shown, the movable pulley block 42 may include two movable pulleys 421. The two movable pulleys 421 are symmetrically distributed on both sides of the extended platform 4, which can make the tension of the wire rope evenly distributed, ensure the force balance of the extended platform 4 during movement, effectively prevent the platform from tilting or getting stuck on the track 32, and ensure the smoothness and reliability of the telescopic movement.

[0038] In optional implementations, such as Figure 8 As shown, a first sheave 511 and a second sheave 512 can be installed on the winch 51. The diameter of the first sheave 511 is D, and the diameter of the second sheave 512 is d, where D=2d. The first wire rope 52 is connected to the first sheave 511, and the second wire rope 53 is connected to the second sheave 512. By setting two sheaves with a diameter ratio of 2:1 and connecting them to different wire rope transmission paths (direct traction and traction by the movable pulley block 42), the winding and unwinding speeds of the two wire ropes can be made to form a fixed ratio (e.g., 2:1) when the winch 51 rotates on a single shaft. This design cleverly coordinates the speed relationship between the direct traction and the labor-saving traction system, ensuring the synchronous and stable movement of the extended platform 4 under the combined drive.

[0039] In optional implementations, such as Figure 2 and Figure 3 As shown, a first crossbar 34 for installing the winch 51 can be set in the installation channel 31. A second crossbar 35 parallel to the first crossbar 34 can also be set between the first crossbar 34 and the extended platform 4. A second fixed pulley 36 is set on the second crossbar 35 at the position corresponding to the second pulley 512. A third fixed pulley 37 is set at the end of the second crossbar 35 that connects to the side of the lower platform 3. The second wire rope 53 passes through the second fixed pulley 36, the third fixed pulley 37, the first fixed pulley 33 and the movable pulley group 42 in sequence, providing a clear and optimized bypass path for the second wire rope 53. This structure can change the force transmission direction of the wire rope and avoid interference between the wire rope and the platform structure.

[0040] Using the telescopic working platform for widening steel bridges according to this embodiment includes the following steps: S1: Platform Placement and Installation like Figure 9 As shown, the work platform is moved to the target construction section, so that the suspension part 1 is straddling the top of the bridge cantilever 6, and the position of the platform is adjusted by the casters 11 to ensure that the lower platform 3 is suspended below the bridge cantilever 6. Then, the suspension part 1 and the bridge cantilever 6 are temporarily or fixedly connected by connectors (such as bolts, clamps, etc.) to ensure the overall stability of the platform.

[0041] S2: Platform Length Adjustment like Figure 8As shown, based on the actual width of the boom, the winch 51 is started and rotated in the extension direction. At this time, the second wire rope 53 is wound up and, through the transmission system composed of the first fixed pulley 33 and the movable pulley group 42, the extension platform 4 is pushed to extend smoothly outward along the track 32.

[0042] When the platform needs to be shortened, start the winch 51 and rotate it in the retraction direction. At this time, the first wire rope 52 winds up and pulls the extended platform 4 to retract smoothly inward along the track 32.

[0043] S3: Personnel Entry and Exit and Operations like Figure 1 As shown, construction workers can safely descend to the working surface of the lower platform 3 via the pedestrian passage 21 and / or climbing pole 22 in the connecting part 2, ensuring safety for high-altitude operations. Subsequently, welding, grinding, painting and other processes can be carried out on the working platform with the adjusted length.

[0044] S4: Platform shifting and reset like Figure 1 and Figure 9 As shown, after the current section of construction is completed, the connection between the suspension part 1 and the bridge cantilever 6 is released. The entire working platform is then moved longitudinally or laterally to the next construction section using the casters 11, and steps S1 to S3 are repeated. After all construction is completed, the extended platform 4 is retracted back into its original position for easy transportation and storage.

[0045] Through the steps described above, this method enables the working platform to be quickly positioned on the widened boom, flexibly adjusted in length, and allows for safe and efficient operation of personnel, significantly improving construction adaptability and work efficiency.

[0046] Example 2 like Figure 1 As shown, in this embodiment, the difference from embodiment 1 is that the extended platform 4 is provided with an extended guardrail 43 at its end, the lower platform 3 is provided with a platform guardrail 38 at its top, and a number of steel cable railings 44 are connected between the extended guardrail 43 and the platform guardrail 38.

[0047] When the extended platform 4 is in the extended state, the steel cable railing 44 can form an effective flexible connection between the extended guardrail 43 and the platform guardrail 38, providing uninterrupted lateral safety protection for construction personnel and greatly reducing the risk of falling from heights.

[0048] Example 3 like Figure 2 , Figure 5 and Figure 7As shown, in this embodiment, the difference from embodiment 1 is that the lower platform 3 is provided with a baffle 39 extending into the installation channel 31, and the end of the extended platform 4 near the connecting part 2 is provided with a limiting plate 45 for abutting against the baffle 39. At the same time, in order not to affect the normal passage of the second wire rope 53, a through hole can be provided on the baffle 39. If the second wire rope 53 passes through the position of the baffle 39, it can pass through the through hole on the baffle 39.

[0049] When the extended platform 4 extends outward to its limit position, the limiting plate 45 abuts against the baffle 39, thereby effectively preventing the extended platform 4 from extending excessively and detaching from the installation channel 31, ensuring the structural safety and reliability of the work platform during the extension and retraction process.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A telescopic working platform for a steel bridge with variable-width cantilever arm, characterized in that, It includes a suspension part (1), a connecting part (2), and a lower platform (3); The lower platform (3) and the suspension part (1) are located on the same side of the connecting part (2), and the distance between the lower platform (3) and the suspension part (1) is greater than the maximum thickness of the cantilever arm; The lower platform (3) is provided with an installation channel (31), which is arranged along the length of the lower platform (3); The installation channel (31) is provided with an extended platform (4) and a drive mechanism (5). The bottom of the installation channel (31) is provided with a track (32) for installing the extended platform (4). The bottom of the extended platform (4) is provided with a running wheel (41) adapted to the track (32). The drive mechanism (5) is disposed between the extended platform (4) and the connecting part (2) for driving the extended platform (4) to move along the track (32).

2. The telescopic working platform for a steel bridge with variable-width cantilever as described in claim 1, characterized in that, The drive mechanism (5) includes a winch (51) installed in the installation channel (31), and a first wire rope (52) is provided on the winch (51), which is connected to the extended platform (4).

3. The telescopic working platform for a steel bridge with variable-width cantilever as described in claim 2, characterized in that, The winch (51) is also provided with a second wire rope (53). The lower platform (3) is provided with a first fixed pulley (33) at one end away from the connecting part (2). The extended platform (4) is provided with a movable pulley group (42) at one end near the connecting part (2). The second wire rope (53) passes around the first fixed pulley (33) and the movable pulley group (42) and is connected to the end of the lower platform (3).

4. The telescopic working platform for a steel bridge with variable-width cantilever as described in claim 3, characterized in that, The movable pulley group (42) includes two movable pulleys (421), which are respectively located on both sides of the end of the extended platform (4).

5. A telescopic working platform for a steel bridge with variable-width cantilever as described in claim 3, characterized in that, The winch (51) is provided with a first spool (511) and a second spool (512). The diameter of the first spool (511) is D, and the diameter of the second spool (512) is d, where D=2d. The first wire rope (52) is connected to the first spool (511), and the second wire rope (53) is connected to the second spool (512).

6. The telescopic working platform for a steel bridge with variable-width cantilever as described in claim 3, characterized in that, The installation channel (31) is provided with a first crossbar (34) and a second crossbar (35) that are parallel to each other. The winch (51) is set on the first crossbar (34). The second crossbar (35) is set between the extended platform (4) and the first crossbar (34). The second crossbar (35) is provided with a second fixed pulley (36) corresponding to the position of the winch (51). The end of the second crossbar (35) that connects to the lower platform (3) is provided with a third fixed pulley (37). The second wire rope (53) passes through the second fixed pulley (36), the third fixed pulley (37), the first fixed pulley (33) and the movable pulley group (42) in sequence.

7. The telescopic working platform for a steel bridge with variable-width cantilever as described in claim 1, characterized in that, The extended platform (4) is provided with an extended guardrail (43) at its end, and the lower platform (3) is provided with a platform guardrail (38) at its top. Several steel cable railings (44) are connected between the extended guardrail (43) and the platform guardrail (38).

8. The telescopic working platform for a steel bridge with variable-width cantilever as described in claim 1, characterized in that, The lower platform (3) is provided with a baffle (39) extending into the installation channel (31), and the extended platform (4) is provided with a limiting plate (45) at one end near the connecting part (2) for abutting against the baffle (39).

9. A telescopic working platform for a steel bridge with variable-width cantilever as described in any one of claims 1-8, characterized in that, The connecting part (2) is provided with a pedestrian passage (21), which is set along the height direction of the connecting part (2).

10. A telescopic working platform for a steel bridge with variable-width cantilever as described in claim 9, characterized in that, A plurality of climbing poles (22) are provided on one side of the connecting part (2), and the plurality of climbing poles (22) are arranged along the height direction of the connecting part (2).

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