Modular wind-resistant and Anti-falling aerial work platform for cable-stayed tower and construction method therefor

Abstract

Disclosed in the present invention are a modular wind-resistant and anti-falling aerial work platform for a cable-stayed tower and a construction method therefor. The modular wind-resistant and anti-falling aerial work platform comprises: a suspension platform, comprising two first platforms arranged opposite to each other and two second platforms arranged opposite to each other, wherein any platform is connected to a suspension mechanism on a tower top by means of a lifting mechanism; each of the first platforms comprises a main basket and two auxiliary baskets arranged on the inner side wall of the main basket and move along the main basket under the action of a first driving mechanism; and each of the second platforms comprises two elongated suspended baskets fitted into one another and moving relative to each other under the action of a second driving mechanism, and the outer end portions of the elongated suspended baskets are detachably connected to the auxiliary baskets adjacent thereto; an anti-falling system, anti-falling channels of which are arranged on the inner side walls of the corresponding platforms; and a wind-resistant system, one end of each wind-resistant cable of which is fixed on the suspension mechanism, and the other end extends downwards, passes around a guide pulley located on the corresponding platform, and is then anchored at a bridge deck. The present invention improves the adaptability of the work platform to different cable-stayed tower structures and different construction environments, and ensures the comprehensiveness, stability and safety of maintenance construction.

Description

A modular wind-resistant and fall-prevention aerial work platform for cable towers and its construction method. Technical Field

[0001] This invention relates to the field of bridge engineering technology. More specifically, this invention relates to a modular wind-resistant and fall-prevention aerial work platform for cable towers and its construction method. Background Technology

[0002] Due to factors such as technological level, environmental conditions, and structural form, some bridge towers are prone to damage after long-term use, requiring regular inspection and maintenance. Currently, bridge tower maintenance both domestically and internationally mainly relies on standard suspended platforms for personnel-carrying construction. This method has the following problems in practical applications: Standard suspended platforms cannot adapt well to variable cross-section tower structures, and cannot cover the entire tower surface for damage inspection during lifting and lowering; when performing maintenance work on tower segments over 100 meters high, the operating conditions of standard suspended platforms are greatly affected by external environmental factors, with insufficient wind resistance, especially during sudden gusts or strong winds, which can easily cause significant horizontal swaying of the platform and pose a risk of collision with the tower; when using standard suspended platforms for maintenance without interrupting traffic, some large highway bridges cannot erect protective scaffolding on the bridge deck due to various constraints, making it impossible to simultaneously meet the requirements of not affecting normal traffic operations and avoiding safety risks such as falling objects when using standard suspended platforms for the maintenance of towers on such bridges.

[0003] To address the aforementioned issues, it is necessary to design a modular wind-resistant and fall-prevention aerial work platform for cable towers and its construction method to ensure the comprehensiveness, stability, and safety of maintenance and construction work. Summary of the Invention

[0004] The purpose of this invention is to provide a modular wind-resistant and fall-prevention aerial work platform for cable towers and its construction method, thereby improving the adaptability of the work platform to different cable tower structures and different construction environments, and ensuring the comprehensiveness, stability and safety of maintenance and construction.

[0005] To achieve these objectives and other advantages according to the present invention, a modular wind-resistant and fall-prevention aerial work platform for tower cranes is provided, comprising:

[0006] The suspended platform includes four platforms arranged horizontally along different sides of the tower's cross-section. Each platform is connected to a suspension mechanism located at the top of the tower via a lifting mechanism. The four platforms include two first platforms and two second platforms arranged opposite each other. Each first platform includes a main basket and two auxiliary baskets. The main basket is arranged along the longitudinal direction of the bridge. Each auxiliary basket is horizontally arranged on the side wall adjacent to the main basket and the tower, and moves along the length of the main basket under the action of a first driving mechanism. Each second platform includes two strip-shaped baskets arranged continuously along the transverse direction of the bridge. They are nested together and move relative to each other under the action of a second driving mechanism. The outer ends of the two strip-shaped baskets are detachably connected to the auxiliary baskets of the two first platforms, respectively.

[0007] The fall protection system includes four sets of fall protection slots, which correspond one-to-one with the four platforms. Each set of fall protection slots is installed on the side wall adjacent to the tower of the corresponding platform.

[0008] The wind-resistant system includes four sets of wind-resistant ropes, which correspond one-to-one with the four platforms. One end of each set of wind-resistant ropes is fixed to the suspension mechanism, and the other end is wrapped downwards through the guide wheel located on the corresponding platform and then anchored to the bridge deck.

[0009] The control system includes a controller electrically connected to the lifting mechanism, the first drive mechanism, and the second drive mechanism; and a control terminal electrically connected to the controller.

[0010] Preferably, the modular wind-resistant and fall-prevention aerial work platform for the pylon includes a lifting mechanism comprising multiple lifting frames spaced apart on corresponding platforms, each lifting frame having a hoist, bearing seat, guide wheel mechanism, and safety lock spaced apart; multiple lifting cables corresponding to the multiple lifting frames, with one end of each lifting cable suspended on the suspension mechanism and the other end passing downwards through the bearing seat and guide wheel mechanism on the corresponding lifting frame before connecting to the cable inlet end of the hoist; and multiple safety cables corresponding to the multiple lifting frames, with one end of each safety cable suspended on the suspension mechanism and the other end passing downwards through the bearing seat and guide wheel mechanism on the corresponding lifting frame before connecting to the safety lock.

[0011] Among them, multiple lifting brackets located on the first platform are correspondingly arranged with the two auxiliary baskets, and any lifting bracket is placed on the main basket and drives the corresponding auxiliary basket to move under the action of the first driving mechanism; multiple lifting brackets located on the second platform are spaced apart on the strip basket and fixedly connected to it.

[0012] Preferably, the modular wind-resistant and fall-prevention aerial work platform for the tower also includes four auxiliary lifting devices, which correspond one-to-one with the four platforms. Each auxiliary lifting device includes a support leg, one end of which is fixed to the side wall of the corresponding platform adjacent to the tower; and a wall-mounted wheel, which is rotatably connected to the other end of the support leg through a pin, and the wheel surface of the wall-mounted wheel abuts against the adjacent tower wall.

[0013] Preferably, the modular wind-resistant and fall-prevention aerial work platform for cable towers also includes a safety information detection system, which comprises four detection units, each corresponding to one of the four platforms. Each detection unit is electrically connected to the controller. The detection unit includes a wind speed and direction sensor, which is installed on the top of the corresponding platform; a camera, which is installed above the corresponding platform and used to collect construction image data of the platform; a load limiter, which is installed at the lifting mechanism of the corresponding platform and used to detect the lifting internal stress; and an inclinometer, which is installed at the end of the corresponding platform and used to detect the construction posture data of the platform.

[0014] Preferably, the cable tower uses a modular wind-resistant and fall-prevention aerial work platform, the suspension mechanism includes a first truss, which is erected on the top of the tower crown, and the lifting mechanism is connected to the first truss; a second truss is arranged circumferentially at the lower part of the tower crown, and the wind-resistant system is connected to the second truss.

[0015] Preferably, the modular wind-resistant and fall-prevention aerial work platform for tower cranes includes a first drive mechanism comprising a first track disposed along the length of the main basket between the main basket and the lifting frame; and a first motor configured to drive the lifting frame to move along the first track.

[0016] The second drive mechanism includes a second track disposed between the two strip baskets along the length of the strip basket; and a second motor configured to drive the two strip baskets to move relative to each other along the second track.

[0017] Preferably, the pylon uses a modular wind-resistant and fall-prevention aerial work platform, wherein the outer ends of the two strip-shaped baskets are detachably connected to the auxiliary basket via connecting devices. The connecting devices include clamps. In the connected state, one first platform and two second platforms together form a C-shaped semi-enclosed platform, or two first platforms and two second platforms together form a U-shaped fully enclosed platform.

[0018] Preferably, the modular wind-resistant and fall-prevention aerial work platform for the cable tower includes a set of fall-prevention grooves, which are spaced apart on the top of the side wall adjacent to the cable tower of the corresponding platform. The multiple fall-prevention grooves include fixed fall-prevention grooves and sliding fall-prevention grooves. The sliding fall-prevention groove includes a fall-prevention plate, which is slidably connected to a third track set on the side wall of the platform through a hinge mechanism. The third track is set along the length direction of the platform. The hinge mechanism includes a first hinge plate and a second hinge plate that are hinged to each other. The hinge axis is set along the length direction of the third track. The first hinge plate is slidably set on the third track. The second hinge plate is fixedly connected to the fall-prevention plate. A limiting block is provided between the first hinge plate and the second hinge plate, which is set to limit the maximum rotation angle of the hinge mechanism.

[0019] Preferably, the pylon uses a modular wind-resistant and fall-prevention aerial work platform, and the fall-prevention system further includes four fall-prevention nets, which are respectively installed on the top of the side walls adjacent to the pylon of the four auxiliary baskets of the two first platforms.

[0020] This invention also provides a construction method for a modular wind-resistant and fall-prevention aerial work platform for cable towers, comprising:

[0021] S1. Assemble the four suspended platforms under the tower, and then integrate each platform with the corresponding fall protection system components;

[0022] S2. Install a suspension mechanism at the top of the tower;

[0023] S3. Move the four platforms to the side walls of the tower according to the design requirements, and then install the lifting mechanism, wind-resistant system components and control system corresponding to each platform. At this time, each platform is suspended on the suspension mechanism and can climb on the corresponding side wall of the tower along the corresponding wind-resistant rope under the action of the lifting mechanism.

[0024] S4. Control each platform to climb to the same construction height through the control system, and then adjust the working status of the first drive mechanism and the second drive mechanism so that the spacing and position of the two auxiliary baskets in the first platform and the spacing and position of the outer ends of the two strip baskets in the second platform are adapted to the cross-sectional structure of the tower at the construction height. Then fix the outer ends of each strip basket to the adjacent auxiliary basket so that the four platforms enclose the tower cross-section to form a U-shaped fully enclosed platform. Use the fully enclosed platform to carry out maintenance and construction of the middle and lower tower columns.

[0025] S5. Disconnect the outer end of each strip basket from the adjacent auxiliary basket, control each platform to continue climbing, and repeat step S4 until the first platform located inside the tower can no longer be raised.

[0026] S6. Control the first platform and two second platforms located outside the tower to continue climbing to the same construction height. Then adjust the working status of the first drive mechanism and the second drive mechanism so that the spacing and position of the two auxiliary baskets in the first platform and the position of the outer end of the strip basket adjacent to the first platform in the second platform are adapted to the cross-sectional structure of the tower at this construction height. Then fix each auxiliary basket to the outer end of the adjacent strip basket so that the above three platforms enclose the tower cross-section to form a C-shaped semi-enclosed platform. Use the semi-enclosed platform to carry out the maintenance construction of the upper tower column.

[0027] S7. Disconnect each auxiliary basket from the outer end of the adjacent strip basket, control the three platforms to continue climbing, and repeat step S6 until the full height maintenance of the tower column on that side is completed.

[0028] The present invention has at least the following beneficial effects:

[0029] 1. This invention adapts to the variable cross-section cable tower structure through the relative sliding structure of the first and second platforms. At the same time, the ends of the first and second platforms can be connected sequentially after adapting to the change of the cable tower cross-section to form an integrated suspended platform structure (C-shaped semi-enclosed platform or U-shaped fully enclosed platform) that surrounds the tower body. This can effectively resist wind loads, so that the working platform can adapt to the variable cross-section cable tower structure and solve the problem of insufficient wind resistance stability, thus ensuring the comprehensiveness, stability and safety of cable tower maintenance and construction.

[0030] 2. The suspended platform and corresponding wind-resistant and fall-prevention system of the present invention adopt a modular structure. Each platform can be connected as one unit or operate relatively independently according to actual construction needs. Compared with the standard suspended platform, the modular wind-resistant and fall-prevention high-altitude work platform of the present invention has the advantages of strong adaptability, strong resistance to environmental interference, high flexibility, high stability, and high safety factor (preventing falling objects from heights). It can be widely used in high-altitude work projects and has good application prospects.

[0031] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the plan structure of a modular wind-resistant and fall-proof aerial work platform for cable towers according to an embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of the disassembled structure of the first platform and the second platform in the above embodiment;

[0034] Figure 3 is a schematic diagram of the front elevation structure of the suspension mechanism described in the above embodiment;

[0035] Figure 4 is a side elevation view of the suspension mechanism described in the above embodiment;

[0036] Figure 5 is a schematic diagram of the planar structure of the suspension mechanism described in the above embodiments;

[0037] Figure 6 is a schematic diagram of the construction structure of S6 in a construction method of a modular wind-resistant and fall-proof aerial work platform for cable towers according to an embodiment of the present invention.

[0038] Figure 7 is a schematic diagram of the elevation structure of the C-shaped semi-enclosed platform described in the above embodiment.

[0039] Explanation of reference numerals in the attached figures:

[0040] 11. C-shaped semi-enclosed platform; 12. U-shaped fully enclosed platform; 13. First platform; 131. Main basket; 132. First lifting gantry; 133. Secondary basket; 134. First motor; 135. First track; 14. Second platform; 141. Outer basket; 142. Second lifting gantry; 143. Inner basket; 144. Second motor; 145. Second track; 21. Wall-mounted wheel; 22. Outrigger; 31. Sliding fall arrestor; 32. Fixed fall arrestor; 33. Fall arrestor net; 41. Tower cross-section; 42. Tower crown; 51. Hoist; 52. Bearing seat; 53. Guide wheel mechanism; 54. Lifting cable; 55. Safety cable; 56. Safety lock; 61. Wind-resistant rope; 71. Clamp; 81. First truss; 82. Second truss. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0042] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0043] As shown in Figures 1-7, this invention provides a modular wind-resistant and fall-prevention aerial work platform for cable towers, comprising:

[0044] The suspended platform includes four platforms arranged horizontally along different sides of the tower cross-section 41. Each platform is connected to a suspension mechanism located at the top of the tower via a lifting mechanism. The four platforms include two first platforms 13 and two second platforms 14 arranged opposite each other. Each first platform 13 includes a main basket 131 and two auxiliary baskets 133. The main basket 131 is arranged along the longitudinal direction of the bridge. Each auxiliary basket 133 is horizontally arranged on the side wall of the main basket 131 adjacent to the tower and moves along the length of the main basket 131 under the action of a first driving mechanism. Each second platform 14 includes two strip-shaped baskets arranged continuously along the transverse direction of the bridge. They are nested together and move relative to each other under the action of a second driving mechanism. The outer ends of the two strip-shaped baskets are detachably connected to the auxiliary baskets 133 of the two first platforms 13, respectively.

[0045] The fall protection system includes four sets of fall protection slots, which correspond one-to-one with the four platforms. Each set of fall protection slots is installed on the side wall adjacent to the tower of the corresponding platform.

[0046] The wind-resistant system includes four sets of wind-resistant ropes 61, which correspond one-to-one with the four platforms. One end of any set of wind-resistant ropes 61 is fixed to the suspension mechanism, and the other end is wrapped downwards through the guide wheel located on the corresponding platform and then anchored to the bridge deck.

[0047] The control system includes a controller electrically connected to the lifting mechanism, the first drive mechanism, and the second drive mechanism; and a control terminal electrically connected to the controller.

[0048] In the above technical solution, the main basket 131 and auxiliary basket 133 of the first platform 13, and the two strip-shaped suspended baskets of the second platform 14 are all three-dimensional frame structures with open top surfaces. Their four sides and bottom surfaces are enclosed with protective netting, forming a safe passage for construction personnel to move freely and carry out construction work. The two first platforms 13 and two second platforms 14 are arranged circumferentially around the cross-section 41 of the tower, with each platform corresponding to one side of the tower column to be constructed. The first platform 13 adapts to the corresponding tower side structure through the relative movement of the auxiliary basket 133 and the main basket 131. Specifically, the main basket 131 fits against the tower side, and the two auxiliary baskets 133 move from both ends of the main basket 131 towards the center until they abut against the outer wall of the tower. At this point, the distance between the two auxiliary baskets 133 is exactly equal to the length of the tower side corresponding to the first platform 13. This design allows the construction area to completely cover the entire length of the tower's side. The lateral protrusion structure of the secondary basket 133 also helps to adapt to the cross-sectional shape of non-right-angled towers (as shown by the secondary basket of the first platform on the left side of Figure 1). Furthermore, the main and secondary basket structures work together to achieve a semi-enclosed clamping of the tower wall on that side, significantly increasing the stability and safety when using the platform for maintenance and construction. The second platform uses a sliding sleeve structure of two strip-shaped baskets to adjust the overall length of the second platform, thereby adapting it to the corresponding tower side structure (length). In this embodiment, the main basket 131 and secondary basket 133 of the first platform 13, and the two strip-shaped baskets of the second platform 14, are all segmented aluminum alloy frame structures. They are manufactured in segments in the factory, and after trial assembly, they are transported to the site for final assembly. The structural dimensions of the first platform 13 are adapted to the longitudinal dimensions of the tower, and the structural dimensions of the second platform are adapted to the transverse dimensions of the tower.

[0049] In practical applications, since each platform is equipped with a lifting mechanism, the outer end of the strip-shaped suspended basket can be selectively connected to the adjacent auxiliary basket 133. When all platforms are lifted to the same construction height, in order to adapt to the cross-sectional shape of the tower, the two auxiliary baskets 133 of the first platform 13 and the two ends of the second platform 14 (i.e., the outer ends of the two strip-shaped suspended baskets) are located at the four corners of the tower's cross-section. At this time, the auxiliary baskets 133 can be fixed to the outer ends of the adjacent strip-shaped suspended baskets, so that the four platforms form an integral, fully enclosed platform along the outline of the tower's cross-section. That is, the suspended platform is fitted with an outer sleeve on the outside of the tower. After the platforms are connected as a whole, they are restricted by the tower's main structure and cannot easily sway, which greatly improves the wind resistance stability and construction safety of the suspended platform. When the outer ends of the strip-shaped suspended baskets are not connected to the adjacent auxiliary baskets, each platform can climb and operate independently under the action of the corresponding lifting mechanism. That is, construction personnel on different platforms can carry out independent maintenance and construction on the tower positions at different heights according to the actual construction progress and needs, which effectively improves construction flexibility.

[0050] Meanwhile, the suspended platform is also equipped with a fall protection system and a wind resistance system. Each set of fall protection grooves consists of multiple grooves spaced at intervals along the inner edge of the corresponding platform. Each set of wind-resistant ropes 61 can consist of multiple wind-resistant ropes 61, each corresponding to one of the guide wheels (or more) installed on the sidewall of the corresponding platform. The wind-resistant ropes 61 not only further improve the wind resistance stability of the platform during lifting and construction but also guide the lifting of the platform. Here, the inner side of the platform refers to the side of the platform directly adjacent to (facing) the tower. The fall protection grooves effectively fill any gaps that may exist between the platforms and the tower wall during construction, thereby reducing the risk of falling objects during maintenance and construction, and achieving a fall protection effect.

[0051] This invention addresses the problems encountered during the maintenance of variable cross-section cable towers such as diamond-shaped and A-shaped towers by designing a modular wind-resistant and fall-prevention aerial work platform. The platform adapts to the variable cross-section cable tower structure through the relative sliding structures of the first and second platforms. Simultaneously, each platform can be connected as a whole or operate relatively independently according to actual construction needs. The integrated suspended platform structure surrounds the tower body, effectively resisting wind loads. Furthermore, the accompanying fall-prevention and wind-resistant systems further enhance the stability and safety of the work platform, effectively solving problems such as falling objects and basket swaying. Compared with standard suspended baskets, this modular wind-resistant and fall-prevention aerial work platform has advantages such as strong adaptability, strong resistance to environmental interference, high flexibility, high stability, and a high safety factor. It can be widely used in high-altitude operations (not limited to maintenance) projects and has good application prospects.

[0052] In another technical solution, the modular wind-resistant and fall-prevention high-altitude work platform for the cable tower includes a lifting mechanism comprising multiple lifting frames spaced apart on corresponding platforms. Each lifting frame is equipped with a hoist 51, a bearing seat 52, a guide wheel mechanism 53, and a safety lock 56 at intervals. Multiple lifting cables 54 are correspondingly arranged with the lifting frames. One end of any lifting cable 54 is hung on the suspension mechanism, and the other end passes downwards through the bearing seat 52 and guide wheel mechanism 53 on the corresponding lifting frame before connecting to the cable inlet end of the hoist 51. Multiple safety cables 55 are correspondingly arranged with the lifting frames. One end of any safety cable 55 is hung on the suspension mechanism, and the other end passes downwards through the bearing seat 52 and guide wheel mechanism 53 on the corresponding lifting frame before connecting to the safety lock 56.

[0053] Among them, multiple lifting brackets located on the first platform 13 are correspondingly arranged with the two auxiliary baskets 133. Each lifting bracket is placed on the main basket 131 and drives the corresponding auxiliary basket 133 to move under the action of the first driving mechanism. Multiple lifting brackets located on the second platform 14 are spaced apart on the strip basket and fixedly connected to it.

[0054] In the above technical solution, each platform is equipped with a corresponding lifting mechanism, and these lifting mechanisms together form a lifting system. This configuration eliminates the need to consider the synchronization issue during the lifting of each platform. Even when the ends of adjacent platforms are not fixedly connected, each platform can be lifted relatively independently, and then connected after reaching the same height. After the ends of the first platform 13 and the second platform 14 are fixedly connected, the working platform forms an integral structure encircling the tower body, possessing strong wind resistance and stability. Construction personnel can move between adjacent platforms to achieve maintenance and construction on different sides of the tower, significantly improving construction flexibility. When a platform needs to be lifted, the hoist 51 in the corresponding lifting mechanism is activated to continuously advance the rope. The length of the lifting cable 54 between the suspension mechanism and the lifting frame shortens, and the platform can then climb along the corresponding tower wall (upwards) under the guidance of the wind-resistant rope 61.

[0055] Specifically, the multiple lifting brackets on the first platform 13 are configured as two first lifting brackets 132, and two auxiliary baskets 133 are correspondingly fixed to the inner side of the two first lifting brackets 132 (i.e., the side wall adjacent to the tower of the first lifting bracket). Thus, a single auxiliary basket 133 and its corresponding first lifting bracket 132 together form a moving unit, and the first driving mechanism is used to drive the moving unit to move along the length direction of the main basket. The arrangement of the lifting brackets on the second platform 14 should not interfere with the relative sliding of the two strip baskets. In this embodiment, the two interlocking strip baskets are defined as follows: the outer strip basket 141 is fitted on the outside, and the inner strip basket 143 is fitted on the inside. The multiple lifting brackets on the second platform 14 are configured as two second lifting brackets 142, which are relatively fixed at both ends of the outer basket 141. Each lifting frame is a three-dimensional frame structure fitted onto the outside of the corresponding platform. Its upper structure spans above the platform to allow for the installation of other lifting mechanism components (such as the hoist 51, bearing housing 52, guide wheel mechanism 53, safety lock 56, etc.) without affecting normal passage within the suspended platform. The bearing housing 52 and guide wheel mechanism 53 are both installed at the top of the lifting frame and serve a guiding function, allowing the corresponding lifting cable 54 and safety cable 55 to pass through in parallel. The hoist 51 is installed below the guide wheel mechanism 53. The safety lock 56 can be a centrifugal safety lock, installed near the hoist 51 to ensure safety during lifting.

[0056] In another technical solution, the modular wind-resistant and fall-prevention aerial work platform for the cable tower also includes four auxiliary lifting devices, each corresponding to one of the four platforms. Each auxiliary lifting device includes a support leg 22, one end of which is fixed to the side wall adjacent to the corresponding platform and the cable tower; and a wall-mounted wheel 21, which is rotatably connected to the other end of the support leg 22 via a pin. The wheel surface of the wall-mounted wheel 21 abuts against the adjacent cable tower wall. The structural dimensions of each support leg 22 need to be determined based on parameters such as the maintenance distance between the corresponding platform and the cable tower surface. The direction of the wall-mounted wheel 21 is set upward along the corresponding tower wall (i.e., vertically). Thus, when the corresponding platform is lifted by the lifting mechanism, the sliding friction between the platform and the side wall of the cable tower is converted into rolling friction between the wall-mounted wheel and the tower wall, reducing wear on the tower wall and also reducing the internal stress of the lifting mechanism, which is conducive to the smooth and stable climbing of the platform.

[0057] In another technical solution, the modular wind-resistant and fall-prevention aerial work platform for cable towers also includes a safety information detection system, which comprises four detection units, each corresponding to one of the four platforms. Each detection unit is electrically connected to the controller. Each detection unit includes a wind speed and direction sensor, installed on the top of the corresponding platform; a camera, installed above the corresponding platform to collect construction image data; a load limiter, installed at the lifting mechanism of the corresponding platform to detect lifting internal stress; and an inclinometer, installed at the end of the corresponding platform to detect the platform's construction posture data. Specifically, the wind speed and direction sensor is an integrated wind speed and direction sensor, located at the outer end of the corresponding platform and securely connected to the top of the platform with screws; the camera is installed on the top of the lifting frame with screws, its lens facing downwards towards the platform; the load limiter is a pin-type sensor, inserted into the center of the pulley of the lifting mechanism (i.e., the guide wheel mechanism 53 in this embodiment), used to monitor the internal stress of the lifting mechanism (i.e., the tension of the lifting cable 54); and the inclinometer is also located at the top of the outer end of the corresponding platform. The real-time data monitored by the aforementioned sensors is transmitted to the controller via wired / wireless means. After identification and analysis, the controller displays the corresponding safety information on the control terminal. Construction personnel read the safety information data on the control terminal and adjust the construction status of each platform accordingly. If the wind speed exceeds the set warning limit, care should be taken to maintain the connection between the platforms as much as possible, ensuring that the working platform completely surrounds the tower to guarantee the safety of the construction process. Due to the small size of the components of the detection unit, their locations are not specifically shown in the attached diagram.

[0058] In another technical solution, the cable tower uses a modular wind-resistant and fall-prevention high-altitude work platform. The suspension mechanism includes a first truss 81, which is erected on top of the tower crown 42, and the lifting mechanism is connected to the first truss 81. A second truss 82 is arranged circumferentially below the tower crown 42, and the wind-resistant system is connected to the second truss 82. Specifically, both the first truss 81 and the second truss 82 are truss structures composed of short square steel members, which are assembled by connecting flanges. Each truss is anchored to the tower crown 42 using chemical anchors. In this embodiment, as shown in Figures 3-5, the tower crown 42 is located at the top of the cable tower, and a step is formed between the bottom of the tower crown 42 and the cable tower body, naturally forming a double-layer tower top platform. Both layers of the tower top platform are equipped with guardrails on their outer perimeter. The first truss 81 is erected on the upper tower top platform, and the second truss 82 is located above the lower tower top platform. The first truss 81 and the second truss 82 are equipped with multiple hanging points. The first truss 81 is used to hang the cables of the lifting mechanism, and the second truss 82 is used to hang the cables of the wind-resistant system (wind-resistant rope 61). On the one hand, this allows the suspension mechanisms to be staggered in spatial position, avoiding interference and entanglement between multiple different sets of cables during construction, which would affect the smooth progress of construction. On the other hand, the wind-resistant rope hung on the second truss has better wind resistance stability, further ensuring the safety and reliability of construction.

[0059] In another technical solution, the modular wind-resistant and fall-proof aerial work platform for cable towers includes a first drive mechanism comprising a first track 135, which is arranged along the length of the main basket 131 between the main basket 131 and the lifting frame; and a first motor 134, which is configured to drive the lifting frame to move along the first track 135.

[0060] The second drive mechanism includes a second track 145, which is disposed between the two strip baskets along the length direction of the strip basket; and a second motor 144, which is configured to drive the two strip baskets to move relative to each other along the second track 145.

[0061] Specifically, the first track 135 is a rack mounted on the outer wall of the main basket 131 (the side wall away from the adjacent tower wall). The first motor 134 is fixed on the corresponding lifting bracket. The output shaft of the first motor 134 is connected to the rack via a gear. Thus, when the first motor 134 is working, its output shaft drives the gear to rotate, thereby driving the lifting bracket to move along the rack. The secondary basket 133 is fixed on the inner wall of the lifting bracket (the side wall adjacent to the tower wall), and can move synchronously along the length of the main basket 131 under the drive of the lifting bracket. For the same first platform 13, the first track 135 of its two first drive mechanisms can be shared, and the first track 135 covers the entire length of the main basket 131. Similarly, the second track 145 can also be configured as a rack, which is fixed to the outer wall of the inner basket 143 (the side wall away from the adjacent tower wall). The second motor 144 is fixed to the outer wall of the outer basket 141 (the side wall away from the adjacent tower wall). The output shaft of the second motor 144 passes between the inner and outer baskets 141 and is connected to the rack (of the second track) through a gear. Thus, when the second motor 144 is working, the extension / retraction of the inner basket 143 relative to the outer basket 141 can be achieved through the engagement between the gear and the rack. In addition, to ensure the sliding stability between the two strip baskets, a C-shaped groove is provided on the side wall of the outer basket 141 (adjacent to the inner basket 143), and a corresponding slider is fixed on the side wall of the inner basket 143 (adjacent to the outer basket 141), which engages with and slides into the C-shaped groove. In this embodiment, both the first motor 134 and the second motor 144 are worm gear reducers.

[0062] In another technical solution, the modular wind-resistant and fall-prevention aerial work platform for the cable tower has two strip-shaped suspended baskets whose outer ends are detachably connected to the secondary basket 133 via connecting devices. The connecting devices include clamps 71. In the connected state, one first platform 13 and two second platforms 14 together form a C-shaped semi-enclosed platform 11, or the two first platforms 13 and two second platforms 14 together form a U-shaped fully enclosed platform 12. Specifically, in the connected state, the outer ends of the strip-shaped suspended baskets are fitted and fixed to the side walls of the secondary basket 133. In actual construction, the connection form of the clamp 71 is flexible, allowing the outer end of the strip basket to abut against the side wall of the auxiliary basket 133 in different directions. As shown in Figure 1, in order to adapt to the arc surface of the left tower wall, the two auxiliary baskets 133 located on the first platform 13 on the left side move closer to the middle of the main basket 131 (until they abut against the tower wall). At this time, the ends of the second platform 14 (the outer ends of the outer basket 141) set along the upper and lower tower walls simultaneously abut against the inner side wall of the main basket 131 and the upper / lower side walls of the auxiliary basket 133. The right tower wall has a right-angled side section. After the two auxiliary baskets 133 located on the first platform 13 on the right side move adaptively, they abut against the edges of the upper and lower tower walls. At this time, the ends of the second platform 14 (the outer ends of the inner basket 143) conform to the inner end face (left side wall) of the auxiliary basket 133 on the same side. Various connection structures exist between the outer end of the strip-shaped suspended platform and the auxiliary platform, which can be flexibly selected and implemented according to the cross-sectional shape of the tower. This allows the suspended platform, after connection, to better adapt to changes in the cross-section of towers of different shapes and structures, and to achieve comprehensive maintenance and construction. In addition, for diamond-shaped or A-shaped tower structures, after the suspended platform rises to a certain height, the first platform located inside the tower is restricted by the tower's structure and cannot continue to climb (it gets stuck below the top tip structure of the tower). At this time, the connection of the first platform can be disconnected individually, and the remaining three platforms can be used to continue climbing and construction. After connection, the three platforms also surround the tower body, forming a C-shaped semi-enclosed platform 11. Thus, while adapting to changes in the tower's cross-section, the wind resistance stability of the working platform is ensured.

[0063] In another technical solution, the modular wind-resistant and fall-prevention aerial work platform for the cable tower includes a set of fall-prevention grooves comprising multiple fall-prevention grooves spaced apart on the top of the side wall adjacent to the cable tower. The multiple fall-prevention grooves include fixed fall-prevention grooves 32 and sliding fall-prevention grooves 31. The sliding fall-prevention groove 31 includes a fall-prevention plate, which is slidably connected to a third track on the side wall of the platform via a hinge mechanism. The third track is arranged along the length of the platform. The hinge mechanism includes a first hinge plate and a second hinge plate hinged together, with their hinge axis arranged along the length of the third track. The first hinge plate is slidably disposed on the third track, and the second hinge plate is fixedly connected to the fall-prevention plate. A limiting block is provided between the first hinge plate and the second hinge plate to limit the maximum rotation angle of the hinge mechanism.

[0064] In the above technical solution, the structure and position of the fixed fall arrestor 32 and the sliding fall arrestor 31 do not interfere with the sliding structure of the strip basket or the inherent structure of the tower body. Specifically, the fixed fall arrestor 32 is set on the second platform 14, and multiple fixed fall arrestors can be set, which are spaced apart on the side wall adjacent to the tower of the outer basket 141 (the strip basket fitted on the outside is defined as the outer basket 141, and the strip basket fitted on the inside is defined as the inner basket 143); multiple sliding fall arrestors 31 are set on the first platform 13, which are spaced apart on the side wall adjacent to the tower of the main basket 131, and the sliding fall arrestor 31 on the second platform 14 is set on the side wall adjacent to the tower of the inner basket 143. The single sliding fall arrestor 31 adopts a flip-plate sliding structure. When maintenance and construction are carried out, its fall arrestor is set horizontally. When the platform is lifted, the fall arrestor can be flipped and folded into the platform through the hinge mechanism, which does not easily affect the lifting action and avoids the problem of the inwardly protruding fall arrestor colliding with the tower wall. The hinge mechanism is located on the top of the side wall adjacent to the tower of the corresponding platform. Specifically, the first hinge plate is parallel to the side wall of the platform and flush with its top. The hinge shaft is located at the top of the first hinge plate. The two sides of the vertical plane where the first hinge plate is located are the inside and outside of the platform, respectively. The second hinge plate can be folded inward to the limit position (parallel to the side protective net). When the second hinge plate is folded outward to a horizontal state, the upward side of the second hinge plate is set as the front. The fall arrestor is then horizontally fixed on the front side of the second hinge plate. The limiting block is located on the back side of the second hinge plate. Under the action of the limiting block, the second hinge plate cannot continue to rotate downward (outward), thereby enabling the fall arrestor to be stably maintained in a horizontal blocking state and to achieve the fall arrest function.

[0065] In another technical solution, the modular wind-resistant and fall-prevention aerial work platform for the cable tower includes a fall-prevention system comprising four fall-prevention nets 33, which are respectively installed on the top of the side walls adjacent to the cable tower on the four auxiliary baskets 133 of the two first platforms 13. To adapt to different tower wall shapes, the placement of the auxiliary baskets at different construction heights is subject to considerable uncertainty and variation. Using a fall-prevention net structure as a fall-prevention measure on the side of the auxiliary basket adjacent to the cable tower better adapts to the construction application of the auxiliary basket and ensures fall-prevention effectiveness.

[0066] This invention also provides a construction method for a modular wind-resistant and fall-prevention aerial work platform for cable towers, comprising:

[0067] S1. Assemble the four suspended platforms under the tower, and then integrate each platform with the corresponding fall protection system components and auxiliary lifting devices;

[0068] S2. Install a suspension mechanism at the top of the tower;

[0069] S3. Move the four platforms to the side walls of the tower according to the design requirements, and then install the lifting mechanism, wind-resistant system components, detection unit and control system corresponding to each platform. At this time, each platform is suspended on the suspension mechanism and can climb on the corresponding side wall of the tower along the corresponding wind-resistant rope 61 under the action of the lifting mechanism.

[0070] The control system includes a controller and a control terminal. The controller can be integrated on the suspended platform to facilitate electrical connection of various control components. The control terminal can be selectively installed on the platform or in the control room under the tower so that on-site construction personnel or remote monitoring personnel can adjust the construction status of the work platform according to the real-time construction situation.

[0071] S4. Control each platform to climb to the same construction height through the control system, and then adjust the working state of the first drive mechanism and the second drive mechanism so that the spacing and position of the two auxiliary baskets 133 in the first platform 13 and the spacing and position of the outer ends of the two strip baskets in the second platform 14 are adapted to the structure of the cable tower cross section 41 at the construction height. Then fix the outer ends of each strip basket to the adjacent auxiliary basket 133 so that the four platforms enclose the cable tower cross section 41 in a U-shape to form a fully enclosed platform 12. Use the fully enclosed platform to carry out the maintenance and construction of the middle and lower tower columns.

[0072] S5. Disconnect the outer end of each strip basket from the adjacent secondary basket 133, control each platform to continue climbing, repeat step S4 until the first platform 13 located inside the tower can no longer be raised. At this time, the first platform 13 located inside the tower can be removed from the tower in advance.

[0073] S6. Control the first platform 13 and the two second platforms 14 located outside the tower to continue climbing to the same construction height. Then adjust the working status of the first drive mechanism and the second drive mechanism so that the spacing and position of the two auxiliary baskets 133 in the first platform 13 and the position of the outer end of the strip basket adjacent to the first platform 13 in the second platform 14 are adapted to the structure of the tower cross section 41 at the construction height. Then fix each auxiliary basket 133 to the outer end of the adjacent strip basket so that the above three platforms enclose the tower cross section 41 in a C-shaped semi-enclosed platform 11. Use the semi-enclosed platform to carry out the maintenance construction of the upper tower column.

[0074] S7. Disconnect each auxiliary basket 133 from the outer end of the adjacent strip basket, control the three platforms to continue climbing, repeat step S6 until the full height maintenance of the tower column on this side is completed; after all construction is completed, dismantle and remove the remaining first platform 13 and second platform 14.

[0075] In the above technical solution, S3-S7 is the construction process for a single tower column. The same set of equipment (modular wind-resistant and fall-proof high-altitude work platform) can be used to carry out maintenance and construction on the other tower column after the construction of the tower column on this side is completed. Alternatively, two sets of identical equipment can be set up and installed on the tower columns on both sides respectively to carry out maintenance and construction at the same time. After both sets of equipment have climbed to the upper tower column segment, the first platform 13 located on the inner side of the tower is removed from the two sets of equipment. The remaining multiple platforms form C-shaped semi-enclosed platforms 11 on both sides of the tower top. The maintenance and construction of the upper tower column can continue according to the normal construction steps. Thus, the comprehensive maintenance and construction of the entire tower structure (both tower columns + tower top structure) can be completed within the original maintenance and construction cycle of a single tower column, which greatly improves the maintenance and construction efficiency.

[0076] It is worth noting that in S4-S7, the four platforms can also operate independently under conditions of minimal environmental interference (such as no rain or snow, low wind speed, and favorable wind direction) and stable construction. That is, each platform can remain at a different construction height for maintenance and construction. In this case, the structure of each platform (the position of the auxiliary basket / strip suspended platform) only needs to be adjusted according to the structure of the corresponding side of the tower's cross-section at that height (covering the entire length of that side), without needing to consider the positional relationship between different platforms. Environmental interference and construction status information can be determined through the detection data transmitted by the safety information detection system.

[0077] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

A modular wind-resistant and fall-prevention aerial work platform for cable towers, characterized in that, include: The suspended platform includes four platforms arranged horizontally along different sides of the tower's cross-section. Each platform is connected to a suspension mechanism located at the top of the tower via a lifting mechanism. The four platforms include two first platforms and two second platforms arranged opposite each other. Each first platform includes a main basket and two auxiliary baskets. The main basket is arranged along the longitudinal direction of the bridge. Each auxiliary basket is horizontally arranged on the side wall adjacent to the main basket and the tower, and moves along the length of the main basket under the action of a first driving mechanism. Each second platform includes two strip-shaped baskets arranged continuously along the transverse direction of the bridge. They are nested together and move relative to each other under the action of a second driving mechanism. The outer ends of the two strip-shaped baskets are detachably connected to the auxiliary baskets of the two first platforms, respectively. The fall protection system includes four sets of fall protection slots, which correspond one-to-one with the four platforms. Each set of fall protection slots is installed on the side wall adjacent to the tower of the corresponding platform. The wind-resistant system includes four sets of wind-resistant ropes, which correspond one-to-one with the four platforms. One end of each set of wind-resistant ropes is fixed to the suspension mechanism, and the other end is wrapped downwards through the guide wheel located on the corresponding platform and then anchored to the bridge deck. The control system includes a controller electrically connected to the lifting mechanism, the first drive mechanism, and the second drive mechanism; and a control terminal electrically connected to the controller. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 1 is characterized in that, The lifting mechanism includes multiple lifting frames spaced apart on corresponding platforms. Each lifting frame is equipped with a hoist, bearing housing, guide wheel mechanism, and safety lock at intervals. Multiple lifting cables are also provided, corresponding to the lifting frames. One end of each lifting cable is attached to the suspension mechanism, and the other end passes downwards through the bearing housing and guide wheel mechanism of the corresponding lifting frame before connecting to the cable inlet end of the hoist. Finally, multiple safety cables are also provided, corresponding to the lifting frames. One end of each safety cable is attached to the suspension mechanism, and the other end passes downwards through the bearing housing and guide wheel mechanism of the corresponding lifting frame before connecting to the safety lock. Among them, multiple lifting brackets located on the first platform are correspondingly arranged with the two auxiliary baskets, and any lifting bracket is placed on the main basket and drives the corresponding auxiliary basket to move under the action of the first driving mechanism; multiple lifting brackets located on the second platform are spaced apart on the strip basket and fixedly connected to it. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 1 is characterized in that, It also includes four auxiliary lifting devices, which correspond one-to-one with the four platforms. Each auxiliary lifting device includes a support leg, one end of which is fixed to the side wall of the corresponding platform adjacent to the tower. The wall-mounted wheel is rotatably connected to the other end of the support leg via a pin, and the wheel surface of the wall-mounted wheel abuts against the adjacent tower wall. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 1 is characterized in that, It also includes a safety information detection system, which comprises four detection units, each corresponding to one of the four platforms. Each detection unit is electrically connected to the controller. The detection unit includes a wind speed and direction sensor, which is installed on the top of the corresponding platform; and a camera, which is installed above the corresponding platform and used to collect construction image data of the platform. A load limiter is installed at the lifting mechanism of the corresponding platform and is used to detect the internal stress during lifting; an inclinometer is installed at the end of the corresponding platform and is used to detect the construction posture data of the platform. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 1 is characterized in that, The suspension mechanism includes a first truss, which is erected on the top of the tower crown, and the lifting mechanism is connected to the first truss; a second truss, which is arranged circumferentially at the lower part of the tower crown, and the wind-resistant system is connected to the second truss. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 2 is characterized in that, The first drive mechanism includes a first track disposed between the main basket and the lifting frame along the length of the main basket; and a first motor configured to drive the lifting frame to move along the first track. The second drive mechanism includes a second track disposed between the two strip baskets along the length of the strip basket; and a second motor configured to drive the two strip baskets to move relative to each other along the second track. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 1 is characterized in that, The outer ends of the two strip-shaped suspended baskets are detachably connected to the auxiliary basket via connecting devices. The connecting devices include clamps. In the connected state, one first platform and two second platforms together form a C-shaped semi-enclosed platform, or the two first platforms and two second platforms together form a U-shaped fully enclosed platform. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 1 is characterized in that, The set of fall arresting grooves includes multiple fall arresting grooves, which are spaced apart on the top of the side wall adjacent to the tower of the corresponding platform. The multiple fall arresting grooves include fixed fall arresting grooves and sliding fall arresting grooves. The sliding fall arresting groove includes a fall arresting plate, which is slidably connected to a third track set on the side wall of the platform through a hinge mechanism. The third track is set along the length direction of the platform. The hinge mechanism includes a first hinge plate and a second hinge plate that are hinged to each other. The hinge axis is set along the length direction of the third track. The first hinge plate is slidably set on the third track. The second hinge plate is fixedly connected to the fall arresting plate. A limiting block is provided between the first hinge plate and the second hinge plate, which is set to limit the maximum rotation angle of the hinge mechanism. The modular wind-resistant and fall-prevention aerial work platform for cable towers as described in claim 8 is characterized in that, The fall protection system also includes four fall protection nets, which are respectively installed on the top of the side walls adjacent to the tower of the four auxiliary baskets of the two first platforms. The construction method of the modular wind-resistant and fall-prevention aerial work platform for cable towers as described in any one of claims 1-9 is characterized in that, include: S1. Assemble the four suspended platforms under the tower, and then integrate each platform with the corresponding fall protection system components; S2. Install a suspension mechanism at the top of the tower; S3. Move the four platforms to the side walls of the tower according to the design requirements, and then install the lifting mechanism, wind-resistant system components and control system corresponding to each platform. At this time, each platform is suspended on the suspension mechanism and can climb on the corresponding side wall of the tower along the corresponding wind-resistant rope under the action of the lifting mechanism. S4. Control each platform to climb to the same construction height through the control system, and then adjust the working status of the first drive mechanism and the second drive mechanism so that the spacing and position of the two auxiliary baskets in the first platform and the spacing and position of the outer ends of the two strip baskets in the second platform are adapted to the cross-sectional structure of the tower at the construction height. Then fix the outer ends of each strip basket to the adjacent auxiliary basket so that the four platforms enclose the tower cross-section to form a U-shaped fully enclosed platform. Use the fully enclosed platform to carry out maintenance and construction of the middle and lower tower columns. S5. Disconnect the outer end of each strip basket from the adjacent auxiliary basket, control each platform to continue climbing, and repeat step S4 until the first platform located inside the tower can no longer be raised. S6. Control the first platform and two second platforms located outside the tower to continue climbing to the same construction height. Then adjust the working status of the first drive mechanism and the second drive mechanism so that the spacing and position of the two auxiliary baskets in the first platform and the position of the outer end of the strip basket adjacent to the first platform in the second platform are adapted to the cross-sectional structure of the tower at this construction height. Then fix each auxiliary basket to the outer end of the adjacent strip basket so that the above three platforms enclose the tower cross-section to form a C-shaped semi-enclosed platform. Use the semi-enclosed platform to carry out the maintenance construction of the upper tower column. S7. Disconnect each auxiliary basket from the outer end of the adjacent strip basket, control the three platforms to continue climbing, and repeat step S6 until the full height maintenance of the tower column on that side is completed.

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