Bridge deck hoisting device and method

Abstract

The present invention relates to the technical field of lifting equipment, and specifically discloses a bridge deck lifting device and method. The lifting device includes a frame and a lifting mechanism, a wire rope and a sling arranged on the frame. The lifting mechanism lifts the bridge section through the wire rope and the sling. The lifting mechanism includes a driving assembly, a drum assembly 1, a drum assembly 2, a braking assembly, a limit assembly and a damping assembly; the drum assembly 1 includes two drums 1, and the driving assembly drives the two drums 1 to rotate synchronously; the drum assembly 2 includes two drums 2, and both ends of the wire rope are wound on the drum 1 and the drum 2 at the same time; the drum assembly 1 and the drum assembly 2 are connected by a limit assembly, and the drum assembly 2 is connected to the damping assembly; the braking assembly is simultaneously connected to the two drums 1, and the braking assembly is used to trigger the limit assembly to work when the two drums 1 rotate asynchronously. The lifting device and method provided by the present invention improve the safety during the lifting process of the bridge section.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and in particular to a bridge deck lifting device and method. Background Art

[0002] During bridge construction, prefabricated bridge sections are often hoisted and transported using lifting equipment. During the lifting process, the weight of the bridge forces the lifting equipment to remain under high load for extended periods, potentially exposing it to potential failures. Complex operating environments can also impact the stability of the lifting equipment, leading to equipment failures that can interrupt lifting operations. During the lifting process, a bridge section could fall due to a lifting equipment failure, potentially damaging the installed bridge structure or other equipment, posing a significant safety hazard.

[0003] The patent application document with publication number CN119750423A discloses a safe lifting mechanism with synchronized drums, including two driving devices, two drums, a reduction mechanism, a synchronous gearbox assembly, a fault detection device and a safety brake assembly. The two driving devices are connected to one side of the two drums through the reduction mechanism, and the synchronous gearbox assemblies are respectively connected to the other sides of the two drums for synchronous rotation of the two drums. The fault detection device is arranged inside the synchronous gearbox assembly for detecting the load torque inside the synchronous gearbox assembly. The safety brake assemblies are respectively arranged on the two drums for decelerating and braking the drums. The lifting mechanism detects the load torque inside the synchronous gearbox assembly through the fault detection device, and triggers a warning signal when an abnormal load torque is detected. The safety brake assembly is quickly started to decelerate or brake the drum to prevent the hoisted objects from falling due to equipment failure.

[0004] When lifting a bridge section using lifting equipment, if the lifting equipment fails during the lifting process, there are still certain safety hazards if only emergency braking is used to prevent the lifted objects from falling due to equipment failure. This is especially true for bridge sections with heavier weights. During emergency braking, the lifted bridge section will generate a large impact force due to inertia, which may cause damage to the lifting equipment, wire ropes or other connecting components. The bridge section may also swing in mid-air due to the impact force, increasing the risk of collision with surrounding structures. Summary of the Invention

[0005] The present invention provides a bridge deck hoisting device and method, which aims to solve the problem in the related art that when a bridge is hoisted by a hoisting device, if the hoisting device fails, emergency braking is used to prevent the bridge from falling, and the bridge hangs in the air, which poses a great safety hazard.

[0006] The bridge deck hoisting device of the present invention comprises a frame and a lifting mechanism, a steel wire rope and a sling arranged on the frame. The lifting mechanism lifts the bridge section through the steel wire rope and the sling. The device is characterized in that the lifting mechanism comprises a driving assembly, a drum assembly 1, a drum assembly 2, a braking assembly, a limiting assembly and a damping assembly; the drum assembly 1 comprises two drums 1, and the driving assembly drives the two drums 1 to rotate synchronously respectively; the drum assembly 2 comprises two drums 2, and the two ends of the steel wire rope are simultaneously wound around the drum 1 and the drum 2. ; The reel assembly 1 and the reel assembly 2 are connected through the limit assembly, and the limit assembly limits the reel assembly 1 and the reel assembly 2 from working at the same time; the brake assembly is connected to the two reels 1 at the same time, and the brake assembly cooperates with the limit assembly. The brake assembly is used to trigger the limit assembly to work when the two reels 1 rotate asynchronously, and switch the working states of the reel assembly 1 and the reel assembly 2; the damping assembly is connected to the reel assembly 2 and is used to increase the resistance of the reel 2 when it rotates.

[0007] The beneficial effects are: improving the safety of the lifting device for lifting the bridge section, the lifting mechanism is provided with a drum assembly 1 and a drum assembly 2, the drum assembly 1 cooperates with the drive assembly for normal lifting of the bridge section, after the lifting work of the drum assembly 1 fails, the brake assembly and the limit assembly cooperate to brake the drum assembly 1 and limit the rotation of the drum 1 to prevent the lifted bridge section from falling, and at the same time release the restriction on the drum 2, so that after the drum assembly 1 fails, the bridge section can be lowered through the drum assembly 2, the damping assembly is used to increase the resistance of the drum 2 during rotation, so as to achieve slow and stable lowering of the bridge section. When the lifting mechanism drive fails, the lifting device of this scheme effectively avoids the safety hazards caused by the suspended bridge section, thereby improving the safety of bridge construction.

[0008] Preferably, the brake assembly includes a connecting shaft 1 and a connecting shaft 2, one end of the connecting shaft 1 is fixedly connected to one of the reels 1, and the other end of the connecting shaft 1 is provided with a cylindrical connecting portion, and a plurality of slots are evenly arranged circumferentially in the connecting portion, one end of the connecting shaft 2 is fixedly connected to the other reel 1, and the other end of the connecting shaft 2 is elastically connected with a plurality of blocks evenly arranged circumferentially, the connecting shaft 2 is rotatably matched with the connecting portion, and each of the blocks moves relative to each of the slots.

[0009] Preferably, a workbench is provided on the frame, the lifting mechanism is provided on the workbench, there are two groups of limit assemblies, the two groups of limit assemblies are respectively connected to the connecting shaft 1 and the connecting shaft 2, the limit assembly includes a connecting piece, a limit piece and an insertion rod, the connecting piece is fixed on the workbench, the limit piece slides with the connecting piece in the vertical direction, the limit piece is elastically connected to the workbench, the circumferential sides of the connecting shaft 1 and the connecting shaft 2 are uniformly provided with a plurality of tooth portions 1, the upper end of the limit piece is provided with a tooth portion 2, the tooth portion 1 and the tooth portion 2 are opposite to each other in the vertical direction, the insertion rod is movably connected to the limit piece, and the insertion rod is separated from the limit piece when the block is opposite to the slot.

[0010] The beneficial effects are: improving the strength of the locking of the drum by the limit assembly, the tooth portion 2 on the limit member is movably connected with the tooth portion 1 on the connecting shaft 1 or the connecting shaft 2, and after a failure occurs in the lifting of the bridge section, the limit member can quickly contact the tooth portion 1 under the action of elasticity after the insertion rod is separated from the limit member, and limit the rotation of the connecting shaft 1 and the connecting shaft 2 through the meshing action of the tooth portion 1 and the tooth portion 2, thereby preventing the bridge section from falling.

[0011] Preferably, the two reels 2 are connected by a rotating shaft, and tooth portions 3 are fixed at both ends of the rotating shaft. A connecting tube is fixed on the workbench, and a movable block is elastically slidably connected in the vertical direction inside the connecting tube. The upper end of the movable block is provided with a tooth portion 4 that is movably abutted against the tooth portion 3. A movable rod is fixed to the insertion rod, and the movable rod is movably abutted against the lower end of the movable block.

[0012] The beneficial effects are: improving the sensitivity of the coordination between the reel assembly 2 and the reel assembly 1, the insertion rod abuts against the movable block through the movable rod, so that when the insertion rod is separated from the limit piece, the movable rod is driven to separate from the movable rod, and the movable block is separated from the tooth part 4 under the elastic action, so as to lock the reel 1 and release the restriction on the reel 2 at the same time, reduce the impact force caused by inertia during emergency braking of the bridge section, and further reduce the shaking of the bridge section.

[0013] Preferably, the damping assembly includes an adjusting chamber, an oil chamber, a winding rope and a movable plate, one end of the winding rope is fixed to the rotating shaft, and the other end of the winding rope is fixed to the movable plate, a partition is provided between the adjusting chamber and the oil chamber, a liquid inlet hole is provided on the partition, and the movable plate slides against the side wall of the adjusting chamber.

[0014] The beneficial effects are: improving the stability of the lowering bridge section of the drum assembly 2, and driving the movable plate to move upward in the adjustment cavity through the winding rope when the shaft rotates. The cavity between the partition and the movable plate is in a relatively negative pressure state. The negative pressure further blocks the upward movement of the movable plate, thereby achieving the purpose of limiting the rotation speed of the shaft and the drum 2, and realizing the stable lowering of the bridge section.

[0015] Preferably, there are multiple winding ropes, and the winding ropes are arranged at intervals along the axial direction of the connecting shaft.

[0016] Preferably, the connecting shaft is slidably connected to a movable part along its axial direction, the movable part is connected to the clamping block through a connecting rod, an abutment portion extends from the insertion rod, and the movable part is in contact with the abutment portion.

[0017] Preferably, the two insertion rods overlap in the length direction thereof, and a tooth portion five is provided on the overlapping end portions of the two insertion rods. A gear is rotatably provided on the workbench, and the two tooth portions five are engaged with the gear at the same time.

[0018] The beneficial effect is: further improving the strength of locking the two reels, the two rods can achieve synchronous reverse sliding under the meshing action of the gears, so that when one rod is disengaged from the limit piece, the other rod is driven to disengage from the limit piece, so that the two limit pieces are locked with the connecting shaft one and the connecting shaft two at the same time.

[0019] Preferably, the driving assembly includes two driving sources, and the two driving sources are respectively connected to the two reels.

[0020] The bridge deck hoisting method of the bridge deck hoisting device provided by the present invention comprises the following steps:

[0021] S1. Preliminary preparation: formulate a lifting plan according to the bridge design drawings and technical requirements, and conduct a comprehensive inspection of the lifting equipment;

[0022] S2. Prefabricated components are prepared. Bridge segments are prefabricated in a factory or dedicated area on site, and the locations of the lifting points are marked on the bridge segments according to the design plan.

[0023] S3. Install the lifting device, move the lifting device to the designated position, and correctly install the lifting device according to the lifting point position on the bridge section;

[0024] S4, lifting and moving, slowly lifting the bridge section off the ground, keeping it steadily rising to the predetermined height, and moving the bridge section to the target position;

[0025] S5. Fix and connect, complete the connection work between bridge sections according to design requirements.

[0026] The beneficial effects are: improving the safety of the lifting device for lifting the bridge section, the lifting mechanism is provided with a drum assembly 1 and a drum assembly 2, the drum assembly 1 cooperates with the drive assembly for normal lifting of the bridge section, after the lifting work of the drum assembly 1 fails, the brake assembly and the limit assembly cooperate to brake the drum assembly 1 and limit the rotation of the drum 1 to prevent the lifted bridge section from falling, and at the same time release the restriction on the drum 2, so that after the drum assembly 1 fails, the bridge section can be lowered through the drum assembly 2, the damping assembly is used to increase the resistance of the drum 2 during rotation, so as to achieve slow and stable lowering of the bridge section. When the lifting mechanism drive fails, the lifting device of this scheme effectively avoids the safety hazards caused by the suspended bridge section, thereby improving the safety of bridge construction.

[0027] The beneficial effects of the present invention are:

[0028] (1) To improve the safety of the bridge section hoisted by the lifting device, the lifting mechanism is provided with a drum assembly 1 and a drum assembly 2. The drum assembly 1 cooperates with the drive assembly to normally lift the bridge section. When the lifting operation of the drum assembly 1 fails, the brake assembly and the limit assembly work together to brake the drum assembly 1 and limit the rotation of the drum 1 to prevent the hoisted bridge section from falling. At the same time, the restriction on the drum 2 is released so that the bridge section can be lowered through the drum assembly 2 after the drum assembly 1 fails. The damping assembly is used to increase the resistance of the drum 2 during rotation to achieve slow and stable lowering of the bridge section. When the lifting mechanism drive fails, the lifting device of this scheme effectively avoids the safety hazards caused by the bridge section being suspended in the air, thereby improving the safety of bridge construction.

[0029] (2) Improve the sensitivity of the coordination between the reel assembly 2 and the reel assembly 1. The plug rod is in contact with the movable block through the movable rod, so that when the plug rod is separated from the limiter, the movable rod is driven to separate from the movable rod. The movable block is separated from the tooth portion 4 under the action of elasticity, so as to lock the reel 1 and release the restriction on the reel 2 at the same time, reduce the impact force caused by inertia during emergency braking of the bridge section, and further reduce the shaking of the bridge section. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a left side view of the hoisting device in the present invention.

[0031] Figure 2 It is a top view of the hoisting device in the present invention.

[0032] Figure 3 It is a structural schematic diagram of the connection between the connecting shaft 1 and the connecting shaft 2 in the present invention.

[0033] Figure 4 It is a structural diagram of the connection between the movable part, the connecting rod and the clamping block in the present invention.

[0034] Figure 5It is a structural diagram of the limiting component in the present invention.

[0035] Figure 6 It is a structural diagram of the connection between the rotating shaft and the damping component in the present invention.

[0036] Figure 7 It is a schematic diagram of the connection structure of the connecting cylinder, the movable block and the movable rod in the present invention.

[0037] Reference numerals:

[0038] 1. Frame; 11. Workbench; 12. Drive source; 13. Wire rope; 14. Hoist; 2. Drum 1; 21. Connecting shaft 1; 211. Connecting part; 22. Connecting shaft 2; 221. Block; 23. Movable part; 24. Connecting rod; 3. Drum 2; 31. Rotating shaft; 311. Gear part 3; 312. Winding rope; 32. Adjusting chamber; 33. Movable plate; 34. Oil chamber; 4. Insert rod; 41. Connecting part; 42. Limiting part; 43. Movable rod; 44. Connecting cylinder; 45. Movable block; 46. Abutting part; 47. Gear; 5. Bridge section. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] like Figure 1 and Figure 2 As shown, the bridge deck hoisting device of the present invention includes a frame 1 and a lifting mechanism, a wire rope 13, and a sling 14 mounted on the frame 1. The lifting mechanism lifts the bridge section 5 via the wire rope 13 and the sling 14. A workbench 11 is provided on the frame 1, and the lifting mechanism is mounted on the workbench 11. The lifting mechanism includes a drive assembly, a drum assembly 1, a drum assembly 2, a brake assembly, a limit assembly, and a damping assembly. Drum assembly 1 includes two drums 1 2, and the drive assembly drives the two drums 1 2 to rotate synchronously. Drum assembly 2 includes two drums 2 3, with both ends of the wire rope 13 wound around drums 1 2 and 2 3 simultaneously. The sling 14 slides in engagement with the wire rope 13. The two drums 2 3 are connected to a damping assembly, which is used to increase resistance when the two drums 2 3 rotate and to limit the rotation speed of the drums 2 3.

[0041] Drum assemblies 1 and 2 are connected by a limiter assembly, which restricts their simultaneous operation. That is, when the two drums 1 and 2 rotate normally to lift the bridge section 5, the limiter assembly restricts the rotation of the two drums 2 and 3. If a rotational failure occurs with drum 1 and 2, the limiter assembly restricts the rotation of drum 1 and 2, and releases the limiter on drum 2 and 3. Under the action of the damping assembly, drum 2 and 3 slowly lower the hoisted bridge section 5. The brake assembly, connected to both drums 1 and 2, works in conjunction with the limiter assembly. The brake assembly activates the limiter assembly when the two drums 1 and 2 rotate out of sync, and switches the operating states of drum assemblies 1 and 2 through the limiter assembly.

[0042] like Figure 3 and Figure 4 As shown, the brake assembly includes a connecting shaft 1 21 and a connecting shaft 2 22. The connecting shaft 1 21, the connecting shaft 2 22, and the two reels 1 2 are all coaxially arranged. One end of the connecting shaft 1 21 is fixedly connected to one reel 1 2, and the other end of the connecting shaft 1 21 is provided with a cylindrical connecting portion 211. The connecting portion 211 has a plurality of slots uniformly arranged along the circumference. One end of the connecting shaft 2 22 is fixedly connected to the other reel 1 2, and the other end of the connecting shaft 2 22 extends into the connecting portion 211. One end of the connecting shaft 2 22 within the connecting portion 211 is provided with a plurality of clamping blocks 221 uniformly arranged along the circumference. Each clamping block 221 slides with the connecting shaft 2 2 along the radial direction of the connecting shaft 2 2 and is elastically connected. Specifically, the clamping block 221 can be connected to the connecting shaft 2 22 via a spring. The second connecting shaft 22 is rotatably matched with the connecting portion 211, and each clamping block 221 is movable relative to each clamping slot. When the clamping block 221 is relative to the clamping slot, the clamping block 221 extends into the clamping slot under the elastic force of the spring and limits the relative rotation of the first connecting shaft 21 and the second connecting shaft 22.

[0043] The drive assembly includes two drive sources 12, each of which may be a motor. A mounting plate is fixed to the workbench 11, and the drive sources 12 are mounted on the mounting plate. The drive ends of the two drive sources 12 are respectively connected to the two reels 1 2. The two drive sources 12 operate synchronously and drive the two reels 1 2 to rotate synchronously. When the drive assembly is operating normally, the block 221 on the connecting shaft 2 22 is misaligned with the slot within the connecting portion 211. When the connecting shaft 1 21 and the connecting shaft 2 22 rotate synchronously with the two reels, the block 221 is not opposite the slot. When either drive source 12 malfunctions, the two reels 1 2 no longer rotate synchronously, the connecting shaft 1 21 and the connecting shaft 2 22 rotate relative to each other, and when the block 221 is opposite the slot, the block 221 extends into the slot, and the connecting shaft 1 21 and the connecting shaft 2 22 are relatively fixed.

[0044] like Figures 3 to 7As shown, the limit assembly and the brake assembly work in conjunction. The limit assembly is used to further lock reel 1-2 after a reel 1-2 malfunctions, preventing it from rotating and thus preventing the suspended bridge section 5 from suddenly falling. The limit assembly includes a connector 41, a limiter 42, and a plunger 4. Connector 41 is fixed to the workbench 11 and can be in the shape of a straight cylinder. Limiter 42 slides vertically within connector 41. The lower end of limiter 42 is connected to the workbench 11 via a spring. A plurality of teeth 1 are evenly distributed around the circumference of connecting shaft 1-21. A tooth 2 is fixed to the upper end of limiter 42, with tooth 1 and tooth 2 facing each other in the vertical direction. The limiting member 42 is provided with an insertion groove, and the insertion rod 4 is movably inserted into the insertion groove. When the insertion rod 4 is inserted into the insertion groove, the limiting member 42 squeezes the spring, and the tooth portion 2 at the upper end of the limiting member 42 does not contact the tooth portion 1. When the insertion rod 4 is disengaged from the insertion groove, the limiting member 42 moves upward under the elastic force of the spring, and the tooth portion 1 contacts and engages with the tooth portion 2. The limiting member 42 blocks the rotation of the connecting shaft 1 21.

[0045] When the block 221 is inserted into the slot, the insertion rod 4 separates from the stopper 42. Specifically, the connecting shaft 1 21 is axially slidably connected to the movable member 23. The movable member 23 is connected to the block 221 via the connecting rod 24. One end of the connecting rod 24 is hinged to the block 221, and the other end of the connecting rod 24 is hinged to the movable member 23. An abutment 46 extends from the insertion rod 4, and the movable member 23 engages with the abutment 46. When the block 221 is opposite the slot, the block 221 slides radially along the connecting shaft 2 22 under the action of elastic force, and the movable member 23 is pulled to slide by the connecting rod 24. The movable member 23 slides in a direction close to the connecting shaft 2 22, pushing the insertion rod 4 to slide in the same direction, causing the insertion rod 4 to disengage from the stopper 42, releasing the stopper 42 from being restrained. The stopper 42 moves upward under the elastic action, and the tooth portion 2 engages with the tooth portion 1, blocking the rotation of the connecting shaft 1 21. The second connecting shaft 22 and the first connecting shaft 21 are locked synchronously under the cooperation of the locking block 221 and the locking groove.

[0046] To further enhance the stability of the locking of the second connecting shaft 22, two sets of limit assemblies can be provided, one for locking the first connecting shaft 21 and the other for locking the second connecting shaft 22. The two rods 4 of the two limit assemblies overlap in their length direction, and the overlapping ends of the two rods 4 are provided with a tooth portion 5. A gear 47 is rotatably provided on the workbench 11, and the two tooth portions 5 simultaneously engage with the gear 47. When the movable member 23 pushes one rod 4 to slide, the other rod 4 simultaneously slides in the opposite direction under the meshing action of the gear 47 and the tooth portion 5, so that the rods 4 of the two limit assemblies simultaneously release the limit on the limit member 42.

[0047] The two reels 3 are connected by a rotating shaft 31, each of which is fixed with a toothed portion 311. A connecting cylinder 44 is fixed to the workbench 11. A movable block 45 is vertically slidably connected to the connecting cylinder 44. The movable block 45 is elastically connected to the connecting cylinder 44 via a spring. The upper end of the movable block 45 is provided with a toothed portion 4 that movably abuts the toothed portion 311. A movable rod 43 is fixed to the insert rod 4. During normal operation of the lifting mechanism, the movable rod 43 movably abuts the lower end of the movable block 45. The spring connecting the movable block 45 is in a compressed and force-accumulating state. The toothed portion 4 on the upper end of the movable block 45 engages with the toothed portion 311 on the rotating shaft 31, thereby limiting the rotation of the rotating shaft 31.

[0048] When the first drum assembly fails, the insertion rod 4 causes the movable rod 43 to slide, disengaging the movable rod 43 from the movable block 45. The movable block 45 moves downward under the elastic force, and the tooth portion 4 separates from the tooth portion 311, releasing the rotational restraint on the rotating shaft 31. That is, after the first drum assembly fails and locks, the second drum assembly is freed from the restraint and slowly rotates under the action of the damping assembly, steadily lowering the bridge segment 5.

[0049] The damping assembly includes an adjustment chamber 32, an oil chamber 34, a reeling rope 312, and a movable plate 33. One end of the reeling rope 312 is fixed to the rotating shaft 31, and the other end is fixed to the movable plate 33. A partition with a liquid inlet hole is provided between the adjustment chamber 32 and the oil chamber 34. The movable plate 33 slides along the sidewall of the adjustment chamber 32. There are multiple reeling ropes 312, each spaced apart along the axial direction of the connecting shaft. When the bridge section 5 rotates by pulling the two drums 23 through the wire rope 13, the rotating shaft 31 rotates synchronously with the drum 23 and reels the winding rope 312. The winding rope 312 pulls the movable plate 33 to fit the adjustment chamber 32 and move up. The space between the movable plate 33 and the partition increases and forms a negative pressure state. The oil in the oil chamber 34 slowly enters the adjustment chamber 32 through the liquid inlet. The negative pressure state between the movable plate 33 and the partition limits the speed at which the movable plate 33 moves up, and then limits the rotation speed of the rotating shaft 31 and the drum 23. When the drum 23 rotates slowly, the bridge section 5 is stably lowered.

[0050] A bridge deck hoisting method, the specific steps are as follows:

[0051] S1. Preliminary preparation: formulate a lifting plan according to the bridge design drawings and technical requirements, including the lifting sequence, lifting point locations, equipment used and personnel arrangements, and conduct a comprehensive inspection of the lifting device provided by the present invention;

[0052] S2. Prefabricated components are prepared. Bridge segment 5 is prefabricated in a factory or a dedicated area on site to ensure accurate dimensions and a smooth surface. The locations of the lifting points are marked on the bridge segment 5 according to the design plan.

[0053] S3, install the lifting device 14, move the lifting device to the designated position, and correctly install the lifting device 14 according to the lifting point position on the bridge section 5;

[0054] S4, lifting and moving, slowly lifting the bridge section 5 off the ground, keeping it steadily rising to a predetermined height, and moving the bridge section 5 to the target position;

[0055] S5. Fix and connect. Complete the connection work between bridge sections 5 according to the design requirements to ensure structural stability. After the lifting task is completed, remove the lifting equipment and related auxiliary tools according to the procedures.

[0056] The bridge deck hoisting device and method provided by the present invention switches the working status of the drum assembly 1 and the drum assembly through a braking assembly and a limiting assembly, so that when the lifting operation of the drum assembly 1 fails, the drum assembly 1 is braked in time, and the two drums of the drum assembly 1 are locked through the limiting assembly to prevent the lifted bridge section from falling. At the same time, the restriction of the drum assembly 2 is released, and the bridge section is slowly lowered, avoiding the safety hazard caused by the bridge section being suspended in the air after the hoisting device fails, thereby increasing the safety of bridge construction.

[0057] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A bridge deck hoisting device, comprising a frame and a lifting mechanism, a steel wire rope and a sling arranged on the frame, wherein the lifting mechanism lifts the bridge section through the steel wire rope and the sling, and is characterized in that: The lifting mechanism includes a driving assembly, a reel assembly 1, a reel assembly 2, a braking assembly, a limiting assembly and a damping assembly; The drum assembly 1 includes two drums 1, and the driving assembly drives the two drums 1 to rotate synchronously respectively; the drum assembly 2 includes two drums 2, and the two ends of the wire rope are wound around the drums 1 and 2 at the same time; the drum assembly 1 and the drum assembly 2 are connected by a limit assembly, and the limit assembly restricts the simultaneous operation of the drum assembly 1 and the drum assembly 2; the brake assembly is connected to the two drums 1 at the same time, and the brake assembly cooperates with the limit assembly. The brake assembly is used to trigger the limit assembly to work when the two drums 1 rotate asynchronously, and switch the working state of the drum assembly 1 and the drum assembly 2; the damping assembly is connected to the drum assembly 2 and is used to increase the resistance of the drum 2 when it rotates; The brake assembly includes a connecting shaft 1 and a connecting shaft 2. One end of the connecting shaft 1 is fixedly connected to a reel 1, and the other end of the connecting shaft 1 is provided with a cylindrical connecting portion. A plurality of slots are evenly arranged in the circumference of the connecting portion. One end of the connecting shaft 2 is fixedly connected to the other reel 1, and the other end of the connecting shaft 2 is elastically connected to a plurality of blocks evenly arranged in the circumference. The connecting shaft 2 is rotatably engaged with the connecting portion, and each block is movable relative to each slot. A workbench is provided on the frame, and the lifting mechanism is provided on the workbench, and there are two limit assemblies, which are respectively connected to the connecting shaft one and the connecting shaft two. The limit assembly includes a connecting piece, a limit piece and a plug rod, the connecting piece is fixed to the workbench, the limit piece slides with the connecting piece in the vertical direction, the limit piece is elastically connected to the workbench, the circumferential sides of the connecting shaft one and the connecting shaft two are evenly provided with a plurality of tooth portions one in the circumferential direction, the upper end of the limit piece is provided with a tooth portion two, the tooth portion one and the tooth portion two are opposite in the vertical direction, the plug rod is movably plugged into the limit piece, and the plug rod is separated from the limit piece when the clamping block is opposite to the clamping slot; the two reels two are connected by a rotating shaft, and tooth portions three are fixed at both ends of the rotating shaft, and a connecting cylinder is fixed on the workbench, and a movable block is elastically slidably connected in the vertical direction, and a tooth portion four is movably abutted with the tooth portion three at the upper end of the movable block, and a movable rod is fixed to the plug rod, and the movable rod is movably abutted with the lower end of the movable block.

2. The bridge deck hoisting device according to claim 1, characterized in that: The damping assembly includes an adjusting chamber, an oil chamber, a winding rope and a movable plate. One end of the winding rope is fixed to the rotating shaft, and the other end of the winding rope is fixed to the movable plate. A partition is provided between the adjusting chamber and the oil chamber, and a liquid inlet hole is provided on the partition. The movable plate slides against the side wall of the adjusting chamber.

3. The bridge deck hoisting device according to claim 2, characterized in that: There are multiple winding ropes, and the winding ropes are arranged at intervals along the axial direction of the connecting shaft.

4. The bridge deck hoisting device according to claim 1, characterized in that: The connecting shaft is slidably connected to a movable part along its axial direction. The movable part is connected to the clamping block through a connecting rod. An abutment portion extends from the inserting rod, and the movable part is fitted with the abutment portion.

5. The bridge deck hoisting device according to claim 4, characterized in that: The two insertion rods are overlapped in the length direction thereof, and a tooth portion five is provided on the overlapping end portions of the two insertion rods. A gear is rotatably provided on the workbench, and the two tooth portions five are engaged with the gear at the same time.

6. The bridge deck hoisting device according to claim 1, characterized in that: The driving assembly includes two driving sources, and the two driving sources are respectively connected to the two reels.

7. A bridge deck hoisting method using the bridge deck hoisting device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Preliminary preparation: formulate a lifting plan according to the bridge design drawings and technical requirements, and conduct a comprehensive inspection of the lifting equipment; S2. Prefabricated components are prepared. Bridge segments are prefabricated in a factory or dedicated area on site, and the locations of the lifting points are marked on the bridge segments according to the design plan. S3. Install the lifting device, move the lifting device to the designated position, and correctly install the lifting device according to the lifting point position on the bridge section; S4, lifting and moving, slowly lifting the bridge section off the ground, keeping it steadily rising to the predetermined height, and moving the bridge section to the target position; S5. Fix and connect, complete the connection work between bridge sections according to design requirements.

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