An aerial work platform for cantilever assembling of full-welded steel truss girder bridge

Abstract

The application discloses an aerial work platform for cantilever assembling of a full-welded steel truss girder bridge, which comprises a track arranged on the steel truss girder bridge and a support platform arranged on the track; the support platform comprises a support base arranged on the track, at least two symmetrical vertical support frames arranged on the support base, an anchoring part arranged at one end of the support base, and folding support frames rotatably connected to both sides of the support base; the folding support frame comprises a first rotating arm rotatably connected to the support base and a second rotating arm rotatably connected to the first rotating arm; at least one support hole is arranged in the vertical support frame, at least one load-bearing column is arranged in the support hole, and a load-bearing cable is arranged on the load-bearing column; the load-bearing column is connected to one end of the second rotating arm away from the first rotating arm through the load-bearing cable; and the aerial work platform can realize folding and storage of the folding support frame, the design enables the platform to be quickly unfolded or folded, and the aerial work platform is suitable for operation requirements in different construction stages.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel truss bridge construction, in particular to an aerial work platform for cantilever assembly of a full-welded steel truss bridge. BACKGROUND

[0002] In recent years, with the development of steel truss bridges towards large span and ultra-small height-to-span ratio, the traditional construction technology is facing severe challenges. In the conditions of limited waterway and complex terrain environment, the aerial work platform for cantilever assembly is used in the prior art to realize the construction of full-welded steel truss bridge in scattered parts.

[0003] For example, a Chinese patent with publication number CN219637728U discloses an aerial work platform, which solves the problem of not being able to use integral segment hoisting through the combination design of the main truss structure, the suspended operation platform and the multi-stage transportation system. However, the platform still has significant defects in actual application: the high self-weight caused by structural redundancy, the main truss adopts a double-layer truss design and is equipped with multiple groups of transverse connections and anchoring systems, which improves the local rigidity but increases the material consumption due to the large overall structural redundancy, resulting in a significant increase in the platform self-weight and an increase in construction energy consumption and cost; the suspended operation platform and the transportation system are concentrated in the upper truss area, and the platform hoisting device needs to be arranged at the middle layer position, which causes the overall center of gravity of the platform to move upward, and in the cantilever state, the high center of gravity aggravates the overturning moment, especially under the action of eccentric load or wind load, which is prone to lateral instability and needs to rely on complex counter-pressure devices to compensate, increasing the construction risk; the anti-overturning capacity is limited, the existing anchoring system adopts the method of connecting steel plates with tension bolts, which can provide vertical restraint but is insufficient in resisting horizontal load, and the node rigidity distribution of the double-layer truss structure is uneven, making it difficult to control the deformation at the cantilever end, further weakening the anti-overturning performance and requiring additional reinforcement measures, which reduces the construction efficiency.

[0004] Therefore, there is an urgent need for a new aerial work platform for cantilever assembly of a full-welded steel truss bridge, which optimizes the structural layout, reduces redundant components, lowers the center of gravity and strengthens the anti-overturning design to solve the problems of excessive self-weight, insufficient stability and weak anti-overturning capacity caused by structural redundancy in the prior art, thereby improving the construction safety and economy. SUMMARY

[0005] To solve the problems of structural redundancy, high center of gravity and insufficient anti-overturning capacity of the existing aerial work platform in the prior art, the present application provides an aerial work platform for cantilever assembly of a full-welded steel truss bridge, comprising:

[0006] a track and a support platform arranged on the steel truss bridge;

[0007] The support platform comprises a support base arranged on the track, at least two symmetrical upright supports arranged on the support base, an anchoring part arranged at one end of the support base, and folding supports rotatably connected to both sides of the support base, wherein the folding supports comprise a first rotating arm rotatably connected to the support base, and a second rotating arm rotatably connected to the first rotating arm.

[0008] At least one support hole is arranged in the upright support, at least one load-bearing column is arranged in the support hole, a load-bearing cable is arranged on the load-bearing column, and the load-bearing column is connected to one end of the second rotating arm away from the first rotating arm through the load-bearing cable.

[0009] Further, a first rotating motor is arranged at the connection between the support base and the first rotating arm, and the first rotating arm is relatively rotatable with the support base through the first rotating motor.

[0010] Further, a connecting sleeve is fixedly connected to one end of the first rotating arm close to the second rotating arm, the second rotating arm is rotatably connected to the connecting sleeve, and a second rotating motor is arranged on the connecting sleeve to control the rotation of the second rotating arm relative to the first rotating arm.

[0011] Further, the second rotating arm comprises a hinged end rotatably connected to the connecting sleeve, a free end away from the first rotating arm, and a middle segment between the hinged end and the free end, a lifting lug is arranged on the free end, a lifting hole is arranged on the lifting lug, and the load-bearing cable is connected to the load-bearing column through the lifting hole.

[0012] Further, a reinforcing column is arranged on the support base, and a reinforcing cable is connected to the reinforcing column, and the other end of the reinforcing cable is connected to the middle segment.

[0013] Further, a plurality of working bottom plates are arranged on the middle segment, the plurality of working bottom plates are fixedly connected to the middle segment and form a working platform, and at least part of the working platform is anchored to the bottom of the steel truss bridge.

[0014] Further, a plurality of anchoring bolts are arranged on the anchoring part, and the support platform is anchored to the steel truss bridge through the anchoring bolts.

[0015] Further, the upright support comprises a main support rod, an upper support rod, and an inclined support rod connected in sequence, a reinforcing support rod is formed downwardly from the upper support rod, a fixed frame rod is arranged between the main support rod and the reinforcing support rod, and a first support hole for arranging the load-bearing column or the reinforcing column is formed between the main support rod, the upper support rod, the reinforcing support rod, and the fixed frame rod.

[0016] Further, a second support hole for arranging the load-bearing column or the reinforcing column is formed between the main support rod, the reinforcing support rod, the fixed frame rod, and the support base.

[0017] Further, a third support hole for passing a load-bearing column or a reinforcing column is formed between the reinforcing struts, the inclined struts and the support base.

[0018] The present application has the following beneficial effects:

[0019] The present application realizes the folding and storage of the folding support frame through the hinged structure of the first rotating arm and the second rotating arm combined with the control of the rotating motor, which enables the platform to be quickly unfolded or folded, adapts to the operation requirements of different construction stages, is especially suitable for scenes with limited space or requiring frequent adjustment of support angle, reduces the time-consuming and errors of manual adjustment, improves the positioning accuracy, for example, when the cantilever is extended or retracted, the motor-driven can quickly complete the attitude adjustment, shortening the construction preparation time.

[0020] The combination structure of the upright support frame and the folding support frame realizes multi-directional support in limited space, reduces redundant components, reduces the self-weight of the platform, meets the high bearing demand, improves the economy, multiple support holes are arranged in the upright support frame, allowing the load-bearing column to be flexibly passed at different heights and positions, facilitating the adjustment of support points according to the actual load distribution, and enhancing the adaptability of the platform to different construction conditions.

[0021] The lifting lug at the free end of the second rotating arm is connected with the load-bearing column through the load-bearing cable, forming a stable force transmission path, which simplifies the lifting process, ensures the efficiency of component transportation and positioning, reduces the risk of high-altitude operation, the reinforcing column and the middle supporting section are connected through the reinforcing cable to form a triangular stable structure, effectively dispersing the concentrated load at the cantilever end, reducing the deformation of the platform under dynamic load, and improving the overall anti-overturning ability. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application.

[0023] In the drawings:

[0024] Figure 1 The overall schematic view of the aerial work platform;

[0025] Figure 2 The side view schematic diagram of the aerial work platform;

[0026] Figure 3 The front view schematic diagram of the aerial work platform;

[0027] Figure 4 The overall schematic diagram of the aerial work platform when the folding support frame is folded;

[0028] Figure 5 The side view schematic diagram of the aerial work platform when the folding support frame is folded.

[0029] In the diagram: 1. Steel truss bridge; 11. Track; 2. Support platform; 21. Support base; 211. Moving device; 22. Upright support frame; 221. Main support; 222. Upper support; 223. Diagonal support; 224. Reinforcing support; 225. Fixed support; 23. Anchorage; 231. Anchor bolt; 24. Folding support frame; 241. First rotating arm; 242. Second rotating arm; 2421. Hinge end; 2 422. Free end; 2423. Middle support section; 2424. Lifting lug; 2425. Lifting hole; 243. First rotating motor; 244. Connecting sleeve; 245. Second rotating motor; 25. Load-bearing column; 251. Load-bearing steel cable; 26. Reinforcing column; 261. Reinforcing steel cable; 27. Working platform; 271. Working base plate; 281. First support hole; 282. Second support hole; 283. Third support hole. Detailed Implementation

[0030] The technical solution of the present invention will now be described with reference to the accompanying drawings. However, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1 to 5 As shown, the present invention provides an aerial work platform for cantilever assembly of fully welded steel truss bridges, including a track 11 set on the steel truss bridge 1 and a support platform 2 set on the track 11;

[0032] The support platform 2 includes a support base 21 mounted on the track 11, at least two symmetrically distributed upright supports 22 mounted on the support base 21, an anchoring part 23 mounted at one end of the support base 21, and folding supports 24 rotatably connected to both sides of the support base 21. The folding supports 24 include a first rotating arm 241 rotatably connected to the support base 21 and a second rotating arm 242 rotatably connected to the first rotating arm 241.

[0033] At least one support hole is provided in the upright support frame 22, and at least one load-bearing column 25 is passed through the support hole. A load-bearing steel cable 251 is provided on the load-bearing column 25, and the load-bearing column 25 is connected to the end of the second rotating arm 242 away from the first rotating arm 241 through the load-bearing steel cable 251.

[0034] Specifically, the track is made of high-strength, weather-resistant alloy steel, and its surface is treated with special processes such as galvanizing or sandblasting to enhance corrosion resistance and wear resistance. The cross-section design of the track fully considers the needs of heavy load and high-speed movement, ensuring good stability and durability under extreme weather and long-term use. When laying the track, precise measurement techniques are used to ensure the straightness and levelness of the track, and high-strength connectors such as high-strength bolts are used to tightly connect the tracks, forming a continuous and stable moving path.

[0035] The track is made of hot-rolled low-alloy high-strength structural steel and is continuously rolled. The cross-section is in the shape of an I-beam, and the upper flange surface is finely ground to form a mirror-like flatness. The track units are connected by a stepped mortise and tenon joint, and are connected seamlessly by high-strength bolts with adjustable pre-tightening force, effectively eliminating stress concentration at the joint. The inside of the track is provided with a V-shaped guide groove, which forms a three-point contact with the guide wheels at the bottom of the support base, ensuring that there is no lateral deviation during movement.

[0036] In some embodiments (not shown in the drawings), limit devices are provided at both ends of the track to prevent the support platform from moving beyond the safe range during movement. At the same time, positioning marks are also provided on the track to facilitate accurate control of the platform position by the operator.

[0037] Specifically, the support base 21 has a moving device 211 for moving on the track. The moving device uses an electric wheel drive or a hydraulic drive system, which has strong driving force and smooth acceleration performance. The drive system is equipped with an intelligent control system that can automatically adjust the driving force according to the load condition to achieve energy saving and efficient operation. The moving device is also equipped with a guide mechanism such as a guide wheel or a guide rail to ensure that the platform always maintains good contact with the track during movement and prevents deviation and shaking.

[0038] As shown in Figures 1 to 5 In this embodiment, a first rotating motor 243 is provided at the connection between the support base 21 and the first rotating arm 241, and the first rotating arm 241 is connected to the support base 21 through the first rotating motor 243. A connecting sleeve 244 is fixedly connected to one end of the first rotating arm 241 near the second rotating arm 242, and the second rotating arm 242 is rotatably connected to the connecting sleeve 244. A second rotating motor 245 is provided on the connecting sleeve 244 to control the rotation of the second rotating arm 242 relative to the first rotating arm 241.

[0039] Specifically, the support base 21 adopts a box structure, filled with high-strength concrete or high-strength alloy material inside to enhance its rigidity and carrying capacity. The bottom of the support base 21 is installed with wear-resistant and low-noise moving devices 211, which adopt precise bearing and sealing design to reduce friction and wear and prolong service life. The base is also equipped with emergency braking devices and limit switches to ensure that the movement can be quickly stopped in emergency to prevent accidents.

[0040] In some embodiments (not shown in the figure), the support base is a multi-layer box-type welded structure, with a golden section ratio inside arranged in a cross-shaped reinforcing partition, and the space between the partitions is filled with lightweight high-strength composite foam material to reduce the overall weight. The base is integrated with a dual-mode drive system: an electric drive module containing a permanent magnet synchronous motor and a planetary gear reducer direct connection structure, and the output shaft is coupled with the drive wheel shaft through a involute spline; a hydraulic drive module sets up an emergency power unit composed of an axial plunger pump and a radial plunger motor to automatically switch the power source in case of power failure. In addition, the base is equipped with a laser ranging type leveling mechanism at the four corners, which realizes dynamic adjustment of the platform levelness through closed-loop control of the hydraulic legs.

[0041] In this embodiment, the first rotating arm 241 and the second rotating arm 242 are connected through a precise bearing, ensuring flexible and stable rotation. The first rotating motor 243 and the second rotating motor 245 both adopt a low-noise and high-efficiency design, equipped with an overheat protection device to ensure safe operation. The folding and unfolding operation of the folding support frame 24 is simple and fast, which can be completed through a remote control or manual operation. When folded, the support frame occupies a small area, facilitating transportation and storage; when unfolded, the support frame forms a stable support structure, providing strong support for the working platform.

[0042] Specifically, the first rotating arm 241 is connected with the support base 21 through a cross roller bearing, the inner ring of which is fixed with the base flange through hot mounting process, and the outer ring is connected with the rotating arm through circumferentially distributed shear pins, ensuring the uniformity of torque transmission. The first rotating motor 243 adopts a worm gear reduction mechanism, the worm surface is nitrided to improve wear resistance, and the worm gear teeth are embedded with copper-based solid lubrication inserts to realize maintenance-free operation.

[0043] The adapter sleeve of the second rotating arm is provided with a rotating pair, a spiral oil channel and a central oil injection hole, and lithium-based lubricating grease is continuously supplied to the rotating pair through the central oil injection hole. The small gear on the output end of the second rotating motor 245 forms a double-stage reduction transmission with the sleeve outer gear ring, and the gear pair adopts a modified tooth profile design to reduce meshing noise. During the unfolding process of the rotating arm, the two motors are controlled synchronously through CAN bus to ensure that the angular velocities of the first and second rotating arms move coordinately according to the preset proportion.

[0044] As Figure 1 and Figure 2As shown, in this embodiment, the second rotating arm 242 includes a hinged end 2421 rotatably connected to the adapter sleeve 244, a free end 2422 away from the first rotating arm 241, and a middle section 2423 between the hinged end 2421 and the free end 2422. A lifting lug 2424 is provided on the free end 2422, and a lifting hole 2425 is provided on the lifting lug 2424. The load-bearing cable 251 is connected to the load-bearing column 25 through the lifting hole 2425.

[0045] Specifically, the load-bearing column 25 is made of high-strength alloy steel material, which has excellent load-bearing capacity and deformation resistance. The diameter and length of the load-bearing column 25 are accurately calculated and designed according to the weight and height of the work platform, ensuring that the support force remains stable during the operation.

[0046] The load-bearing cable 251 is made of high-strength synthetic fiber material, which has excellent wear resistance, aging resistance, and fatigue resistance. The diameter and length of the cable are also accurately calculated and designed to ensure that it can withstand the weight and dynamic load of the work platform. The connection of the cable uses special connecting pieces and locking devices to ensure firm and reliable connection.

[0047] The load-bearing column 25 and the load-bearing cable 251 are connected by a binding connection method, which is fixed by a special binding belt and a locking device. The binding belt is made of high-strength synthetic fiber material, which has excellent wear resistance and aging resistance. The locking device is designed with a self-locking function to ensure that it does not loosen or fall off during operation.

[0048] As shown in Figure 1 and Figure 2 , in this embodiment, a reinforcing column 26 is erected on the support base 21, and a reinforcing cable 261 is connected to the reinforcing column 26. The other end of the reinforcing cable 261 is connected to the middle section 2423.

[0049] Specifically, the reinforcing column 26 has the same material and structure as the load-bearing column 25, which has excellent load-bearing capacity and deformation resistance. The reinforcing column 26 is connected to the upright support 22 through a special connecting piece to ensure firm and reliable connection. The reinforcing cable 261 connects the reinforcing column 26 and the middle section 2423 to form a stable support structure. The reinforcing cable 261 has the same material and structure as the load-bearing cable 251, which has excellent load-bearing capacity and wear resistance. The connection of the reinforcing cable 261 also uses special connecting pieces and locking devices for fixation.

[0050] As shown in Figures 1 to 5 , in this embodiment, a plurality of work floors 271 are laid on the middle section 2423. The plurality of work floors 271 are fixedly connected to the middle section 2423 to form a work platform 27. At least part of the work platform 27 is anchored to the bottom of the steel truss bridge 1.

[0051] In some embodiments (not shown in the drawings), the edge of the working platform is provided with a safety guardrail, the height and spacing of the guardrail are accurately calculated and designed to meet relevant safety standards. The guardrail is made of high-strength alloy steel material, which has excellent impact resistance and durability. The surface of the guardrail is also coated with anti-skid paint to increase the safety of the workers when walking. The surface of the working platform is provided with drainage holes and drainage channels to prevent water accumulation from affecting work. The design of the drainage holes and drainage channels fully considers the drainage needs of rainwater and cleaning water to ensure that there is no water accumulation during rainy days or cleaning operations.

[0052] As shown in Figures 1 to 5 In this embodiment, a plurality of anchor bolts 231 are arranged on the anchoring part 23, and the support platform 2 is anchored on the steel truss bridge 1 through the anchor bolts 231. The anchor bolts 231 are made of high-strength alloy material and have a self-locking function to prevent loosening.

[0053] As shown in Figure 2 In this embodiment, the upright support frame 22 includes a main support rod 221, an upper support rod 222, and an inclined support rod 223 connected in sequence, a reinforcing support rod 224 is formed downwardly extending from the upper support rod 222, and a fixing frame rod 225 is arranged between the main support rod 221 and the reinforcing support rod 224.

[0054] Specifically, the main support rod 221 is fixedly arranged vertically on the support base 21, the upper support rod 222 is fixedly arranged at the top end of the main support rod 221, and the inclined support rod 223 is fixedly connected at one end of the upper support rod 222 away from the main support rod, and the other end of the inclined support rod is fixedly connected to the support base 21. The main support rod 221, the upper support rod 222, the reinforcing support rod 224, and the inclined support rod 223 are all made of high-quality steel and are welded together to form a stable frame structure. The design of the inclined support rod 223 not only enhances the overturning resistance of the support frame, but also optimizes the overall stress distribution.

[0055] Among them, the first support hole 281 for passing the load-bearing column 25 or the reinforcing column 26 is formed between the main support rod 221, the upper support rod 222, the reinforcing support rod 224, and the fixing frame rod 225; the second support hole 282 for passing the load-bearing column 25 or the reinforcing column 26 is formed between the main support rod 221, the reinforcing support rod 224, the fixing frame rod 225, and the support base 21; the third support hole 283 for passing the load-bearing column 25 or the reinforcing column 26 is formed between the reinforcing support rod 224, the inclined support rod 223, and the support base 21; to ensure that the load-bearing column 25 or the reinforcing column 26 can be accurately passed through to form an effective support structure. The edges of the support holes are provided with reinforcing ribs to prevent deformation due to long-term stress.

[0056] Further, to improve safety, the support platform can further include a safety protection system (not shown in the figure), which includes: an emergency braking device including a double-redundant design of an electromagnetic power-off brake and a hydraulic rail clamp; a built-in piezoelectric collision sensor in the guardrail, which triggers an audible and visual alarm within 0.5 seconds; the electrical system meets the IP67 protection level, and double shielding layers are arranged on the key lines to resist interference.

[0057] The present application has many use scenarios, including but not limited to the following described scenarios:

[0058] The cantilever assembly construction of the large-span steel truss bridge forms a cantilever support by track positioning and unfolding of the folding support frame in complex terrain, cooperates with the load-bearing steel cable and the anchoring bolt, and provides a stable high-altitude work surface for steel beam hoisting and welding;

[0059] Dynamic construction adjustment and narrow space operation, the folding support frame angle is adjusted by a rotating motor, the moving device translates the platform along the track, and different stages of cantilever extension are adapted; the compact structure can be retracted to pass through the bridge tower, the curved section and other restricted spaces;

[0060] High-altitude welding maintenance and existing bridge reinforcement, the work base forms an operation platform, the reinforced steel cable enhances the rigidity, the anchoring part quickly locks the bridge node, supports welding, bolt fastening and local component replacement, reduces the impact on traffic, and combines modular design and automation control to realize efficient, stable and highly adaptable aerial operation.

Claims

1. An aerial work platform for cantilever assembly of a full-welded steel truss girder bridge, characterized in that, The utility model relates to a kind of steel truss bridge construction method, including: Track and support platform arranged on steel truss bridge; Support platform includes support base arranged on track, at least two symmetrical distribution vertical support frame arranged on support base, anchoring portion arranged at one end of support base, and folding support frame rotatably connected on both sides of support base, folding support frame includes first rotating arm rotatably connected support base, and second rotating arm rotatably connected first rotating arm; At least one support hole is arranged in vertical support frame, at least one load-bearing column is arranged in support hole, load-bearing cable is arranged on load-bearing column, load-bearing column is connected to the end of second rotating arm away from first rotating arm by load-bearing cable; Wherein, first rotating motor is arranged at the connection of support base and first rotating arm, and first rotating arm is rotatable relative to support base by first rotating motor; Wherein, connection sleeve is fixedly connected to the end of first rotating arm close to second rotating arm, second rotating arm is rotatably connected to connection sleeve, and second rotating motor for controlling the rotation of second rotating arm relative to first rotating arm is arranged on connection sleeve; Wherein, second rotating arm includes hinged end rotatably connected to connection sleeve and free end away from first rotating arm, and middle segment between hinged end and free end, lifting lug is arranged on free end, lifting hole is arranged on lifting lug, load-bearing cable is connected to load-bearing column by lifting hole to form binding connection; Wherein, reinforcing column is arranged on support base, reinforcing cable is connected to reinforcing column, and the other end of reinforcing cable is connected to middle segment; Wherein, a plurality of working bottom plates are arranged on middle segment, and a plurality of working bottom plates are fixedly connected to middle segment to form working platform, and at least part of working platform is anchored to the bottom of steel truss bridge; Wherein, a plurality of anchor bolts are arranged on anchoring portion, and support platform is anchored to steel truss bridge by anchor bolt.

2. The aerial work platform for cantilever assembling of a full-welded steel truss girder bridge according to claim 1, characterized in that, Vertical support frame includes main support rod, upper support rod and inclined support rod connected in sequence, reinforcing support rod is formed by extending downward from upper support rod, fixed frame rod is arranged between main support rod and reinforcing support rod, and first support hole for passing load-bearing column or reinforcing column is formed between main support rod, upper support rod, reinforcing support rod and fixed frame rod.

3. The aerial work platform for cantilever assembling of a full-welded steel truss girder bridge according to claim 2, characterized in that, Second support hole for passing load-bearing column or reinforcing column is formed between main support rod, reinforcing support rod, fixed frame rod and support base.

4. The aerial work platform for cantilever assembling of a full-welded steel truss girder bridge according to claim 3, characterized in that, Third support hole for passing load-bearing column or reinforcing column is formed between reinforcing support rod, inclined support rod and support base.

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