Steel box girder bridge plate hoisting structure and hoisting method

Abstract

The invention relates to the technical field of bridge construction equipment, in particular to a steel box girder bridge plate hoisting structure and method. Comprising a base, a traction wheel is rotationally installed on the base, static friction discs are fixed to the two sides of the traction wheel, a support is fixed to the base, dynamic friction discs are installed on the support in a sliding mode, and the two dynamic friction discs abut against a driving rod; a plurality of clamping grooves are annularly arrayed in the traction wheel hub, a locking rod is rotationally installed on the base and tends to be away from the clamping grooves all the time under the action of a first elastic piece, a pull rope is arranged at the end of the locking rod, and the other end of the pull rope is connected with the end, abutting against the dynamic friction disc, of the driving rod. Brake of the traction wheel is modified, friction brake between a dynamic friction disc and a static friction disc is arranged, and a rigid locking structure with a lock rod inserted into a hub of the traction wheel is further arranged. Equivalently, traditional friction braking only depends on compression type friction braking, and through combination of friction braking and rigid locking, the rigid braking mode of cuttage locking is more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction equipment, and in particular to a steel box girder bridge plate hoisting structure and a hoisting method. Background Art

[0002] Steel box girder, also known as steel plate box girder, is a commonly used structural form for large-span bridges. Its main body adopts a closed box section composed of welded top plate, bottom plate, web plate and cross diaphragm. It has technical advantages such as high resistance stiffness, strong integrity and outstanding spanning capacity. It is often prefabricated into standard segments and used after hoisting and splicing in engineering fields such as highway interchange hubs, cross-line bridges and large-span cable-stayed bridges.

[0003] During the construction of steel box girder bridges, the hoisting of standard segment plates mostly adopts rail-type shunting hoisting system and fixed gantry crane hoisting system.

[0004] The primary equipment in a rail-based shunting and hoisting system is a crane. This system is constructed by installing a traveling trolley on a pair of parallel tracks, either suspended from the bridge deck or side, or on the ground (if the distance from the ground is not high). During operation, the prefabricated steel box girder segments are first transported to the bridge site via a rail transport vehicle. The trolley's hydraulic jacking mechanism is then activated to raise the segment to the desired height. The luffing mechanism then adjusts the lifting position, and finally, a synchronous traveling system completes the lateral positioning, completing the hoisting operation.

[0005] The core of the fixed gantry crane hoisting system is the gantry crane. Heavy gantry cranes are set up on both sides of the pier, and vertical hoisting is carried out using electric hoists under the main beam.

[0006] Both of the aforementioned lifting systems are capable of lifting steel box girders, but both suffer from motion control issues: during lifting, components are subject to wind loads, inertial loads, and operational errors, making them prone to three-dimensional oscillation. This is especially true when using a gantry crane for large-span lifting. Lateral sway is common at the end of the longitudinal movement, severely impacting docking accuracy, which in turn affects the linear structure control of the bridge and the safety of the project. Furthermore, regarding lifting suspension braking, dynamic braking of the traction device is essential for ensuring stable lifting. Traditional friction disc brakes and hydraulic holding brakes experience thermal degradation during continuous operation, resulting in longer braking response times than in the initial operating state, leading to deviations in positioning accuracy. Furthermore, in the event of a sudden power outage, the lack of an emergency lock poses a safety hazard of hook slippage.

[0007] To this end, the present invention provides a steel box girder bridge plate lifting structure and lifting method, constructs a three-level braking guarantee system, and adds braking structures to the output and transmission process of the transmission equipment. Especially at the traction sheave, on the basis of transmission braking, a rigid locking system is extended to achieve precise control of all working conditions during the lifting process, providing reliable technical guarantee for the safe lifting of the steel box girder. Summary of the Invention

[0008] The purpose of the present invention is to solve the problems existing in the prior art and to propose a steel box girder bridge plate hoisting structure and hoisting method.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: A steel box girder bridge plate hoisting structure includes a base on which a traction sheave is rotatably mounted. The traction sheave is driven by a driving structure to rotate forward and reverse and brake. A steel strand is wound around the traction sheave. The steel strand is driven by a sequencing mechanism to be sequentially wound back and forth spirally around the traction sheave. A hanging frame is fixed to the hanging end of the steel strand. A plurality of hooks are provided around the hanging frame for hoisting the steel box girder bridge plate. Static friction discs are fixed on opposite sides of the wheel hubs on both sides of the traction wheel, brackets are fixed on opposite sides of the two static friction discs on the base, dynamic friction discs are slidably mounted on the brackets along the axial direction of the traction wheel, and drive rods are abutted on opposite sides of the two dynamic friction discs, the drive rods are rotatably mounted on the brackets, and the drive rods are deflected by being driven by the telescopic rod. There are a number of slots in a circular array on the hubs on both sides of the traction wheel. A locking rod corresponding to the slot is rotatably installed on the side of the hub of the traction wheel on the base. The locking rod always tends to move away from the slot under the action of an elastic member. A pull rope is provided at the end of the locking rod, and the other end of the pull rope is connected to the drive rod against one end of the dynamic friction disk.

[0010] Preferably, the locking rod is movably arranged, and is suspended on the side of the traction wheel hub via an elastic member. A through slot for the lower end of the locking rod to pass through is provided on the base, and a limiting member is provided at the lower end of the locking rod.

[0011] Preferably, a steel cable is provided at the lower end of the locking rod, the steel cable passes through the slot, and a limiting member is provided at the lower end of the steel cable.

[0012] Preferably, the driving structure includes a motor and a transmission box fixed on a base, a gear reduction mechanism is provided in the transmission box, and a worm gear mechanism is provided in the transmission box between the gear reduction mechanism and the motor output shaft.

[0013] Preferably, the base is also provided with a brake mechanism for assisting motor braking, the brake mechanism includes a vertical frame arranged on the base, a pressure rod is rotatably mounted on the upper end of the vertical frame, the pressure rod is driven to deflect back and forth by a telescopic rod 2 rotatably mounted on the base, a rocker is rotatably mounted on the middle part of the pressure rod, a truss is provided at the end of the rocker, a V-shaped frame is plugged into the truss, a brake 1 is rotatably connected to the bending part of the V-shaped frame, a connecting rod is rotatably connected to the other end of the V-shaped frame, and a brake 2 is rotatably connected to the other end of the connecting rod, both brake 1 and brake 2 are rotatably mounted on the bracket and are symmetrically arranged along the output shaft of the motor, and brake shoes are provided on both brake 1 and brake 2.

[0014] Preferably, a brake disc is fixed on the output shaft of the motor, and the first brake and the second brake are symmetrically arranged along both sides of the brake disc.

[0015] Preferably, the sorting mechanism includes a reciprocating screw rotatably mounted on the side of the traction wheel, the reciprocating screw is axially arranged parallel to the traction wheel, a wire arrangement ring is threadedly mounted on the reciprocating screw and slides horizontally relative to the base, a wire ring is fixed on the base on the side of the reciprocating screw away from the traction wheel, and two wire wheels are vertically symmetrically mounted on the base on the side of the wire ring away from the wire arrangement ring, and annular grooves are provided on the outer edge surfaces of the two wire wheels, and the hanging ends of the steel strands pass through the annular grooves of the wire arrangement ring, the wire ring and the guide wheel in sequence.

[0016] Preferably, the outer edge surfaces of the hubs on both sides of the traction sheave are bent toward each other.

[0017] Preferably, a plurality of electric hoists are provided around the lower end of the base, and the output ends of the electric hoists are hooked on the hanging frames respectively.

[0018] A method for hoisting a steel box girder bridge plate, comprising: S1: The lower spreader is pre-installed.

[0019] S2: Reel in and lift the steel box girder.

[0020] S3: Shift adjustment of steel box girder.

[0021] S4: Assemble steel box girder.

[0022] S5: The equipment returns to the parking position of the steel box girder and repeats steps S1-4, repeating the lifting and splicing to complete the bridge splicing.

[0023] Compared with the prior art, the present invention provides a steel box girder bridge plate hoisting structure and hoisting method, which has the following beneficial effects: 1. This invention improves the traction sheave brake. In addition to providing friction braking between the dynamic and static friction discs, it also incorporates a rigid locking structure in which a locking rod is inserted into the traction sheave hub. This rigid braking method, equivalent to conventional compression-only friction braking, is more stable through the combination of friction braking and rigid locking.

[0024] 2. The present invention realizes self-locking, compression friction braking between the dynamic friction disc and the static friction disc, compression braking of the brake mechanism, and rigid locking between the lock rod and the slot through the worm gear mechanism in the drive structure, thereby achieving a multi-level braking effect, making the horizontal movement and lifting of the steel box girder more stable.

[0025] 3. The present invention sets multiple sets of electric hoists around the base. During the hoisting process, the electric hoists are used to tighten and pull the hanging frame, thereby guiding the hanging frame vertically, reducing the amplitude and probability of the steel box girder shaking caused by wind force.

[0026] Other advantages, objects and features of the present invention will be described in part in the following description; and in part will be apparent to those skilled in the art based on an examination of the following; or may be taught from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a three-dimensional schematic diagram of removing the hanging frame of the present invention Figure 1 .

[0028] Figure 2 This is a three-dimensional schematic diagram of removing the hanging frame of the present invention Figure 2 .

[0029] Figure 3 This is a three-dimensional schematic diagram of removing the hanging frame of the present invention Figure 3 .

[0030] Figure 4 It is a rear view schematic diagram of the present invention with the vertical plate removed.

[0031] Figure 5 For the present invention Figure 1 Schematic top view of .

[0032] Figure 6 For the present invention Figure 1 Schematic diagram of the left side.

[0033] Figure 7 For the present invention Figure 1 Schematic diagram of the right side.

[0034] Figure 8 For the present invention Figure 4 Schematic diagram of the cross section at BB.

[0035] Figure 9 For the present invention Figure 4 Partial cross-section at CC.

[0036] Figure 10 For the present invention Figure 6Schematic diagram of the mechanical locking structure of the traction wheel after removing the telescopic rod 1.

[0037] Figure 11 For the present invention Figure 10 3D schematic diagram of .

[0038] Figure 12 This is a schematic diagram of the double pulling structure of the traction rope and the pull rope on the locking rod of the present invention.

[0039] Figure 13 For the present invention Figure 8 Schematic diagram of the radial cross section of the middle traction sheave.

[0040] Figure 14 For the present invention Figure 13 Schematic diagram of the traction wheel rim and disc structure.

[0041] Figure 15 This is a schematic diagram of the installation state of the static friction disk of the present invention on the traction sheave disc.

[0042] Figure 16 It is a schematic diagram of the axial section of the traction sheave of the present invention.

[0043] Figure 17 A three-dimensional diagram of the brake mechanism of the present invention Figure 1 .

[0044] Figure 18 A three-dimensional diagram of the brake mechanism of the present invention Figure 2 .

[0045] Figure 19 It is a plan view of the brake mechanism of the present invention.

[0046] Figure 20 It is a simplified diagram of the gear reduction mechanism and the worm gear mechanism in the driving structure of the present invention.

[0047] Figure 21 It is a simplified three-dimensional diagram of the hanging frame structure of the present invention.

[0048] Figure 22 The present invention is a simplified plan view of a plurality of electric hoists arranged around the hanging frame.

[0049] Figure 23 For the present invention Figure 11 Partial schematic diagram at point D in the middle.

[0050] Figure 24 For the three-dimensional display of the present invention Figure 4 .

[0051] Figure: 1, base; 2, frame; 3, motor; 4, transmission box; 5, rotating shaft; 6, wheel disc; 7, wheel rim; 8, traction sheave; 9, steel strand; 10, reciprocating screw; 11, cable ring; 12, wire ring; 13, wire pulley; 14, mounting base; 15, static friction disc; 16, dynamic friction disc; 17, bracket; 18, driving rod; 19, slot; 20, pull rope; 21, locking rod; 22, spring Component 1; 23. Telescopic rod 2; 24. Pressure rod; 25. Rocker; 26. Truss; 27. V-shaped frame; 28. Brake 1; 29. ​​Brake 2; 30. Brake shoe; 31. Brake disc; 32. Telescopic rod 1; 33. Worm gear mechanism; 34. Gear reduction mechanism; 35. Brake mechanism; 36. Hanging frame; 37. Steel cable; 38. Elastic component 2; 39. Hoop; 40. Traction rope; 41. Connecting rod. DETAILED DESCRIPTION

[0052] The following is a combination of the embodiments of the present invention Figure 1-24 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0053] In Example 1, in order to reduce the impact of thermal degradation of the traction system's braking on the braking response and reduce the safety hazard of hook slippage, the braking of the traction device is improved. To this end, this embodiment provides a steel box girder bridge plate hoisting structure, including a base 1, on which a traction sheave 8 is rotatably mounted. The traction sheave 8 is driven by a drive structure to rotate forward and reverse and brake; a steel strand 9 is wound around the traction sheave 8, which is driven by a sequencing mechanism to spirally wind back and forth around the traction sheave 8 in sequence. A hanging frame 36 is fixed to the hanging end of the steel strand 9, and a plurality of hooks are provided around the hanging frame 36 for hoisting the steel box girder bridge plate. Static friction discs 15 are fixed on opposite sides of the hubs on both sides of the traction sheave 8. Brackets 17 are fixed on opposite sides of the two static friction discs 15 on the base 1. Dynamic friction discs 16 are slidably mounted on the brackets 17 along the axial direction of the traction sheave 8. The two dynamic friction discs 16 are abutted against drive rods 18 on opposite sides. A straight groove 1 is provided in the middle of the drive rod 18 along the length direction. An embedded shaft is slidably mounted in the straight groove 1. The embedded shaft is suspended on the bracket 17. The drive rod 18 is driven and deflected by a telescopic rod 132. There are a number of slots 19 in an annular array on the hubs on both sides of the traction wheel 8. A locking rod 21 corresponding to the slot 19 is rotatably installed on the side of the hub of the traction wheel 8 on the base 1. The locking rod 21 always tends to move away from the slot 19 under the action of an elastic member 22. A pull rope 20 is provided at the end of the locking rod 21, and the other end of the pull rope 20 is connected to the drive rod 18 and is pressed against one end of the dynamic friction disc 16.

[0054] Principle details of this embodiment: A steel box girder bridge plate hoisting structure comprises a base 1, which is made of pipes or assembled by welding or bolts, and is generally rectangular, serving as an installation and movement basis.

[0055] Refer to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 As shown, two frames 2 are symmetrically fixed to the base 1, and both frames 2 are integrally cast. Bearing seats are fixed to both frames 2, and a rotating shaft 5 is mounted within the inner rings of the bearings on the two bearing seats, allowing the rotating shaft 5 to be rotatably mounted on the frame 2. Two wheel discs 6 are symmetrically and removably mounted on the rotating shaft 5, and a traction sheave 8 is removably mounted between the two wheel discs 6. The traction sheave 8 has hubs on both sides, giving the overall vertical cross-section an H-shape. A drive structure is provided on the base 1, and the output end of the drive structure is connected to the rotating shaft 5. The drive structure drives the rotating shaft 5 to rotate, and then drives the traction sheave 8 to rotate synchronously, thereby achieving forward and reverse drive of the traction sheave 8. The drive structure also achieves primary braking of the traction sheave 8, achieving forward and reverse parking and locking of the traction sheave 8.

[0056] Refer to the attached Figure 13 , Attachment Figure 14 , Attachment Figure 16 As shown, in order to achieve detachable installation between the traction sheave 8 and the two wheel discs 6, a rim 7 is provided on the inner surface of the traction sheave 8, and a plurality of mounting holes are provided in a circular array on both the wheel discs 6 and the rim 7, and the number corresponds to one to one, and then they can be fastened and installed by bolts to realize detachable installation of the traction sheave 8.

[0057] Refer to the attached Figure 1 As shown, the traction sheave 8 is provided with a steel strand 9, one end of which is fixed to the traction sheave 8, and the suspended end of the steel strand 9 is spirally wound around the traction sheave 8. A sorting mechanism is provided on the base 1 to guide the steel strand 9 so that it is arranged spirally on the traction sheave 8 in sequence, preventing random misalignment and affecting winding stability. The traction sheave 8 is provided with a spiral groove to assist in the ordering of the spiral winding of the steel strand 9 at the bottom layer of the traction sheave 8.

[0058] After the hanging end of the steel strand 9 passes through the sorting mechanism, a hanging frame 36 is fixedly installed. A plurality of hooks are provided around the hanging frame 36 to hang different parts of the steel box girder around the steel box girder so that the center of gravity of the steel box girder will not shift and shake during the hoisting.

[0059] Refer to the attached Figure 11 , Attachment Figure 15 , Attachment Figure 16As shown, to brake the traction sheave 8, a friction disc brake or a holding brake is generally employed. Both rely on friction braking. In this embodiment, a friction disc brake is used as an example: it includes a static friction disc 15 and a dynamic friction disc 16. Two sets of static friction discs 15 are provided, each bolted to opposite sides of the traction sheave 8's hub, leaving the static friction discs 15 exposed.

[0060] Refer to the attached Figure 9 , Attachment Figure 10 , Attachment Figure 11 As shown, the two frames 2 on the base 1 are fixed with brackets 17 by bolts. In the figure, the bracket 17 is in the shape of an arch bridge. Two horizontal guide sleeves are symmetrically provided on the bracket 17. Guide columns are embedded in the two guide sleeves. The same end of the two guide columns is fixedly connected to a dynamic friction disk 16. Through the cooperation of the guide column and the guide sleeve, the dynamic friction disk 16 can slide axially relative to the static friction disk 15.

[0061] A drive rod 18 is rotatably mounted on the upper end of bracket 17. One end of the drive rod 18 rests on the end surface of the dynamic friction disc 16, while the other end is suspended. A telescopic rod 132 is rotatably mounted on the side of bracket 17. The extended end of the telescopic rod 132 is rotatably connected to the end of the drive rod 18 facing away from the dynamic friction disc 16. The extension of the telescopic rod 132 controls the reciprocating deflection of the drive rod 18, which in turn moves against the dynamic friction disc 16. Friction braking of the traction sheave 8 is achieved through the extrusion and friction between the dynamic friction disc 16 and the static friction disc 15. To reset the dynamic friction disc 16, an elastic member 3 is installed between the guide post and the guide sleeve. The elastic tension of the elastic member 3 constantly forces the dynamic friction disc 16 to move away from the static friction disc 15.

[0062] To mitigate the effects of thermal decay on the traction system's braking response and reduce the potential safety hazard of hook slippage, this embodiment incorporates a rigid locking mechanism: A plurality of retaining grooves 19 are arranged in a circular array on the hubs of both sides of the traction sheave 8. A locking rod 21 is rotatably mounted on the side of the hub of the traction sheave 8, corresponding to the retaining grooves 19. An elastic member 22 is positioned between the locking rod 21 and the frame 2. The elastic member 22 pulls the locking rod 21 away from the retaining grooves 19. A pull cord 20 is attached to the end of the locking rod 21. The other end of the pull cord 20 is connected to the end of the drive rod 18 that rests against the dynamic friction disc 16.

[0063] According to the above technical solution: During hoisting, multiple hooks around the hoisting frame 36 are locked on the steel box girder bridge plate and evenly dispersed to ensure balanced pulling force to avoid shaking due to center of gravity shift during hoisting.

[0064] When the steel box girder bridge plate is hoisted and lifted, the driving structure drives the traction wheel 8 to rotate forward and reverse. Under the traction of the sorting mechanism, the steel strand 9 is spirally wound on the traction wheel 8 or loosened in sequence to avoid disorder in the sorting of the steel strand 9 and affect the traction and lifting stability.

[0065] When the steel box girder bridge deck is hoisted and moved horizontally, the drive structure self-braks, achieving a preliminary locking of the hoisted workpiece. Simultaneously, telescopic rod 132 contracts, pulling the end of drive rod 18 away from dynamic friction disc 16 downward. The end of drive rod 18 resting against dynamic friction disc 16 tilts upward, pushing against dynamic friction disc 16 toward static friction disc 15 until the two are firmly in contact. The squeezing friction between dynamic friction disc 16 and static friction disc 15 creates a secondary braking effect.

[0066] While the driving rod 18 is deflected, the locking rod 21 is pulled and deflected by pulling the pull rope 20, so that the locking rod 21 gradually contacts the hub of the traction sheave 8 and is embedded in the slot 19. The rigid locking of the traction sheave 8 is achieved through the mechanical locking of the locking rod 21 and the slot 19.

[0067] When unlocking, the telescopic rod 132 extends and resets, thereby driving the driving rod 18 to deflect in the opposite direction. The driving rod 18 presses against one end of the dynamic friction disc 16 and sinks. The dynamic friction disc 16 is reset under the action of the elastic member 3; the pull rope 20 no longer generates active pulling force, and the locking rod 21 is separated from the card slot 19 under the action of the elastic member 1 22.

[0068] In summary, this solution introduces modifications to the braking system of the traction sheave 8. In addition to providing friction braking between the dynamic friction disc 16 and the static friction disc 15, a rigid locking structure is also provided, in which the locking rod 21 is inserted into the hub of the traction sheave 8. This rigid braking system, equivalent to conventional friction braking that relies solely on compression, is more stable through the combination of friction braking and rigid locking.

[0069] In this solution, preferably, refer to the attached Figure 10 As shown, a traction rope 40 can also be installed between the end of the locking rod 21 and the end of the drive rod 18 that abuts the dynamic friction disc 16. A direction-changing shaft is provided on the base 1 on the side of the locking rod 21 facing away from the drive rod 18, and the traction rope 40 is routed around the direction-changing shaft. This arrangement ensures that the traction rope 40 and the pull rope 20 are arranged symmetrically in vertical direction. With this arrangement, when the drive rod 18 abuts the end of the dynamic friction disc 16 and sinks, the pull rope 20 loses its active pulling force, while the traction rope 40 generates active pulling force. The traction rope 40 causes the locking rod 21 to move away from the drive rod 18, causing the locking rod 21 to separate from the retaining groove 19, thereby ensuring accurate brake disengagement.

[0070] In this plan, refer to the attached Figure 13 , Attachment Figure 14 As shown, attached Figure 16As shown, the rotating shaft 5 is a stepped shaft. The two ends of the rotating shaft 5 are small-diameter ends at the rotating mounting portion of the bearing seat, while the middle portion is a large-diameter end. The inner diameter of the sleeve of the wheel disc 6 is the same as the small diameter of the rotating shaft 5. After the two wheel discs 6 are buckled on the two ends of the rotating shaft 5, they are connected to the wheel rim 7 by bolts to form a whole. In this way, the wheel disc 6 does not need to be axially positioned on the rotating shaft 5, and can be double-ended by the shaft step at the diameter change of the rotating shaft 5. The large-diameter section of the rotating shaft 5 is provided with open limit grooves at both ends, and the sleeve of the wheel disc 6 is provided with a key that cooperates with the limit groove, forming a key connection. This allows the wheel disc 6 to be clamped onto the rotating shaft 5 without the need for fasteners, making the assembly and splicing of the traction sheave 8 more convenient and quick.

[0071] Example 2, in a further embodiment of this solution, refer to the attached Figure 9 , Attachment Figure 15 As shown, to lock the fixed end of the steel strand 9 to the traction sheave 8, a through-hole is provided on one side of the traction sheave's hub. The hole is set at an angle. The fixed end of the steel strand 9 passes through the hole from the inside of the traction sheave 8 and extends to the outside of the traction sheave 8. It is then bent and locked by multiple sets of clamps 39. The end is also locked by an anchor lock (not shown in the figure). Through repeated fixing, the steel strand 9 is locked.

[0072] However, since the fixed end of the steel strand 9 passes through the hub of the traction sheave 8 and locks onto its outer surface, it would affect the installation of the static friction disc 15 at that location. Therefore, in this embodiment, the static friction disc 15 is assembled on the wheel disc 6. Countersunk holes are provided on the static friction disc 15, corresponding one-to-one with the mounting holes of the wheel disc 6. This allows the wheel disc 6, rim 7, and static friction disc 15 to be assembled and installed using a single set of bolts. This not only allows the static friction disc 15 to be positioned, but also simplifies the assembly process by assembling all three components together. Furthermore, since the countersunk holes are provided on the static friction disc 15, the bolts and corresponding nuts are concealed, preventing interference with the compression friction braking between the static friction disc 15 and the dynamic friction disc 16.

[0073] In a further embodiment of this solution, the heavy steel box girder components being hoisted in this solution place higher demands on the braking performance of the traction sheave 8. While the aforementioned solution achieves rigid locking through the engagement of the locking rod 21 with the retaining groove 19, the sudden high load impact upon engagement of the locking rod 21 and retaining groove 19 can easily break the rotating portion of the locking rod 21. Therefore, in this embodiment, further improvements are made to the solution: Refer to the attached Figure 10As shown, the locking rod 21 is movably mounted and no longer pivotally attached to the frame 2. Instead, it is suspended from the side of the hub of the traction sheave 8 via an elastic member 22. The frame 2 of the base 1 is provided with a slot for the lower end of the locking rod 21 to pass through, and a stopper is provided at the lower end of the locking rod 21. The stopper is larger than the slot to prevent it from becoming unhooked. A vertical plate is provided on the frame 2, to which the elastic member 22 is fixed.

[0074] According to the above technical solution: When the lock rod 21 rotates relative to the lock rod, the rotation axis of the lock rod 21 is easily broken by stress. At this time, after the lock rod 21 is embedded in the slot 19, the load is transferred and concentrated between the limit member and the frame 2, the stress is separated, and it is not easy to crack, thereby improving the stability of the rigid brake.

[0075] Example 4, in a further embodiment of this solution, refer to the attached Figure 10 As shown, to further reduce the probability of deformation and breakage of the locking rod 21 due to stress, a steel cable 37 is provided at the lower end of the locking rod 21. The steel cable 37 passes through a slot, and a stopper is provided at the lower end of the steel cable 37. The steel cable 37 forms a flexible connection, and the locking rod 21 is no longer rigid as a whole. The stress is dispersed as the steel cable 37 deforms, further reducing the probability of breakage.

[0076] In this embodiment, a second elastic member 38 is provided between the limiting member and the frame 2 to prevent the steel cable 37 from loosening, and cooperates with the first elastic member 22 to ensure that the locking rod 21 is stably suspended.

[0077] Example 5: In a further embodiment of this solution, a specific driving structure for achieving braking while ensuring power transmission is provided: Figure 20 As shown, the driving structure includes a motor 3 and a transmission box 4 fixed on the base 1. A gear reduction mechanism 34 is provided in the transmission box 4. A worm gear mechanism 33 is provided in the transmission box 4 between the gear reduction mechanism 34 and the output shaft of the motor 3.

[0078] In this embodiment, the worm gear mechanism 33 includes a worm wheel and a worm rotatably mounted in the transmission case 4. The worm is connected to the output shaft of the motor 3 via a key or a coupling.

[0079] In this embodiment, the gear reduction mechanism 34 is analogous to a reduction gearbox and includes Gear 1, which rotates coaxially with the worm gear; Gear 2, which meshes with Gear 1 but is not coaxial with it; Gear 3, which rotates coaxially with Gear 2; and Gear 4, which meshes with Gear 3 and is coaxially arranged with it. The rotational axis of Gear 4 is connected to the rotational axis 5 of the traction sheave 8 via a key or coupling. Gears 2, 3, and 4 are all rotatably mounted within the transmission case 4, with the gear reduction mechanism 34 providing the reduction transmission.

[0080] In this way, the gear reduction mechanism 34 slows down the output speed of the motor 3 to prevent the traction wheel 8 from shaking due to excessive winding speed; the self-locking property of the worm gear mechanism 33 is used to achieve transmission braking.

[0081] Example 6: In a further embodiment of this solution, in order to further improve the braking performance of the hoisting equipment, the base 1 is further provided with a brake mechanism 35 for assisting the motor 3 in braking. Figure 17 , Attachment Figure 18 , Attachment Figure 19 As shown, the brake mechanism 35 includes a stand mounted on the base 1, with a pressure rod 24 rotatably mounted on its upper end. A second telescopic rod 23 rotatably mounted on the base 1. The extended end of the second telescopic rod 23 rotatably connects to the end of the pressure rod 24, so that the pressure rod 24 is driven to reciprocate and deflect by the extension and contraction of the second telescopic rod 23. A rocker 25 rotatably mounts to the middle of the pressure rod 24, with a truss 26 disposed at the end of the rocker 25. A V-shaped frame 27 is inserted into the truss 26. A brake 1 28 is rotatably connected to the bend of the V-shaped frame 27. A connecting rod 41 is rotatably connected to the other end of the V-shaped frame 27. A second brake 29 is rotatably connected to the other end of the connecting rod 41. Both brakes 1 28 and 29 are rotatably mounted on the bracket 17 and are symmetrically arranged along the output axis of the motor 3. Brake shoes 30 are provided on both brakes 1 28 and 29.

[0082] According to the above technical solution: When the telescopic rod 23 is retracted, the end of the pressure rod 24 sinks and deflects, thereby pulling the lower end of the rocker 25 down. The rocker 25 pulls the brake 1 28 through the truss 26 and the V-shaped frame 27 to deflect toward the output shaft of the motor 3. The descent of the rocker 25 will cause the connecting end of the V-shaped frame 27 and the truss 26 to sink and the other end to tilt upward. The tilted end of the V-shaped frame 27 will pull the connecting rod 41 and drive the brake 2 29 to deflect toward the output shaft of the motor 3, so that the two brake shoes 30 are buckled on the output shaft of the motor 3, adding a clamping braking form and assisting the motor 3 in braking and locking.

[0083] The brake mechanism 35 can also protect the output shaft of the motor 3. When braking, the output shaft of the motor 3 is subjected to reverse torque and deformed or even cracked. In this embodiment, a brake disc 31 is fixed to the output shaft of the motor 3, and the first brake 28 and the second brake 29 are symmetrically arranged on both sides of the brake disc 31. The brake disc 31 expands the space, increases the friction contact surface of the brake shoe 30, and improves the braking performance.

[0084] In this embodiment, the motor 3 is a double-shaft head motor 3, so that the brake disc 31 is arranged at the rear, which does not affect the connection between the output shaft of the motor 3 and the transmission box 4, and also expands the peripheral space for easy disassembly and assembly.

[0085] Example 7, in a further embodiment of this solution, provides a specific sorting mechanism for spirally winding the auxiliary steel strands 9 on the traction sheave 8: Refer to the attached Figure 1 , Attachment Figure 3 , Attachment Figure 6 , Attachment Figure 8 As shown, the sorting mechanism includes supports that stand on two side frames 2. A reciprocating screw 10 is mounted on the two supports for co-rotation. The reciprocating screw 10 has a double helical thread, allowing unidirectional rotation to drive the workpiece back and forth axially. The reciprocating screw 10 is arranged axially parallel to the traction sheave 8. A wire traversing ring 11 is threadedly mounted on the reciprocating screw 10. The wire traversing ring 11 has a mounting hole, into which a limit shaft is inserted. The two ends of the limit shaft are fixed to the two supports. The limit shaft cooperates with the mounting hole to allow the wire traversing ring 11 to slide horizontally relative to the traction sheave 8.

[0086] According to the above technical solution, when in use, by driving the reciprocating screw 10 to rotate, the wire arrangement ring 11 is driven to move back and forth along the axial direction of the reciprocating screw 10, thereby guiding the steel strand 9 to be spirally wound in sequence along the surface of the traction wheel 8 and stacked reciprocatingly.

[0087] To prevent the hanging end of the steel strand 9 from axially moving along the traction sheave 8 as the winding and unwinding conditions change, causing the hoisting components to shift and wobble, this embodiment further includes an arch bridge fixed to the base 1 on the side of the reciprocating screw 10 facing away from the traction sheave 8. A conductor loop 12 is fixed to the center of the arch bridge. After passing through the cable arranging loop 11, the steel strand 9 passes through the conductor loop 12. Since the position of the conductor loop 12 remains unchanged, the position of the hanging end of the steel strand 9 does not change, thereby reducing the impact of the winding of the steel strand 9 on the hoisting condition.

[0088] On the base 1, a mounting seat 14 is located on the side of the wire loop 12 facing away from the cable traversing ring 11. Two wire pulleys 13 are mounted vertically symmetrically on the mounting seat 14. Both wire pulleys 13 have annular grooves on their outer edges. The suspended ends of the steel strands 9 pass sequentially through the annular grooves of the cable traversing ring 11, the wire loop 12, and the guide pulleys. The steel strands 9 are pulled by the cable traversing ring 11 for sequenced winding / unwinding. The wire loop 12 holds the suspended ends in place, while the two guide pulleys retain their position. The guide pulleys and mounting seat 14 provide load support, ensuring that the strands 9 lie flat where they pass through the cable traversing ring 11 and the guide pulleys, preventing damage to the cable traversing ring 11 and the guide pulleys.

[0089] In this embodiment, the reciprocating screw 10 is connected to the rotating shaft 5 via a chain drive, so that the reciprocating screw 10 rotates synchronously with the rotating shaft 5. The accompanying drawings only show the exposed portion where the rotating shaft 5 and the reciprocating screw 10 meet, and do not illustrate the chain drive structure. Alternatively, a separate motor 3 can be provided to drive the reciprocating screw 10.

[0090] Example 8, in a further embodiment of this solution, refer to the attached Figure 23 As shown, the outer edges of the hubs on both sides of the traction sheave 8 are bent toward each other to form hooks, and a locking piece is provided at the end of the locking rod 21. Thus, after the locking rod 21 is engaged in the locking groove 19, even if the locking rod 21 deflects and moves sideways, the locking piece is locked in the hook of the hub, preventing the locking rod 21 from disengaging from the locking groove 19, thereby ensuring the braking effect.

[0091] Example 9, in a further embodiment of this solution, in order to further improve the stability of the hoisting process and reduce the risk of shaking, refer to the attached Figure 22 As shown, multiple sets of electric hoists are installed around the lower end of the base 1, and the output ends of the electric hoists are hooked around the periphery of the hanging frame 36. As shown in the figure, the hanging frame 36 is a quadrangular pyramid, and electric hoists are connected to the four corners. During lifting, the electric hoists reel in and unreel in sync with the winding and unwinding of the steel strand 9, ensuring that the hook wire of the electric hoist always remains straight, thereby pulling and guiding the hanging frame 36, reducing the probability of the hanging frame 36 shaking, and then improving the stability of the lifting to a certain extent. Even through the pulling of the electric hoist, the lifting slope of the steel box girder can be adjusted.

[0092] In this solution, a speed sensor is installed on the base 1, corresponding to the output shaft of the motor 3, to detect the output status of the motor 3. The speed sensor and the control box driving the motor 3 are electrically connected to the telescopic rod 1 32 and the telescopic rod 2 23. When the motor 3 is turned off and the output shaft stops rotating, the telescopic rods 1 32 and 23 receive a signal to brake. Before lifting or hoisting is required, the telescopic rods 1 32 and 23 reset, disabling the brakes before the motor 3 rotates. Only after the brakes are disengaged does the motor 3 start to perform lifting or hoisting, thus avoiding motion interference.

[0093] In this solution, the telescopic rod 1 32 and the telescopic rod 23 are any one of an electric telescopic rod, a hydraulic rod 24 and a pneumatic rod.

[0094] In this solution, the elastic member 1 22 , the elastic member 2 38 , and the elastic member 3 are all springs.

[0095] Example 10: This embodiment provides a method for hoisting a steel box girder, comprising: S1: The lower spreader is pre-installed.

[0096] The traction wheel 8 is driven to pay out the line, so that the hanging frame 36 gradually descends to a suitable position, so that the hook on the hanging frame 36 can be locked on the steel box girder bridge plate.

[0097] S2: Reel in and lift the steel box girder.

[0098] The traction wheel 8 slowly reels the steel strand 9, causing the hanging frame 36 to rise slowly, so that the hook line is slowly tightened to prevent the hook from being unhooked, and also ensure the stability of the initial state of the lifting to avoid shaking just after the lifting.

[0099] S3: Shift adjustment of steel box girder.

[0100] After the steel box girder rises to a certain height, the motor 3 is turned off, and the first level of self-locking braking is achieved by relying on the worm gear mechanism 33.

[0101] At the same time, telescopic rod 132 activates and contracts, pulling the end of drive rod 18 away from dynamic friction disc 16 and sinking it downward. The end of drive rod 18 abutting dynamic friction disc 16 tilts upward, pushing against dynamic friction disc 16 toward static friction disc 15 until they are firmly engaged. The compressive friction between dynamic friction disc 16 and static friction disc 15 achieves traditional second-stage friction braking. As drive rod 18 deflects, the pull cord 20 pulls on locking rod 21, causing it to gradually contact the hub of traction sheave 8 and engage with slot 19. The mechanical interlocking of locking rod 21 with slot 19 ensures the rigid locking of traction sheave 8.

[0102] At the same time, the telescopic rod 23 starts to shrink, driving the end of the pressure rod 24 to sink and deflect, thereby pulling the lower end of the rocker 25 down. The rocker 25 pulls the brake 1 28 through the truss 26 and the V-shaped frame 27 to deflect it toward the output shaft of the motor 3. The descent of the rocker 25 will cause the connecting end of the V-shaped frame 27 and the truss 26 to sink and the other end to tilt upward. The tilted end of the V-shaped frame 27 will pull the connecting rod 41 and drive the brake 2 29 to deflect toward the output shaft of the motor 3, so that the two brake shoes 30 are buckled on the output shaft of the motor 3, forming a third-level clamping brake, which assists the motor 3 in braking and locking.

[0103] Three-level braking, two sets of friction brakes and one set of mechanical locking brakes, to ensure the position stability of the steel box girder during the lifting and translation process.

[0104] After the traction sheave 8 is locked, the steel box girder is transferred along with the traveling vehicle.

[0105] S4: Assemble steel box girder.

[0106] After moving to the bridge assembly position, telescopic rods 1 32 and 23 are extended, causing the drive rod 18 and pressure rod 24 to reset, separating the dynamic friction disc 16 from the static friction disc 15, the lock rod 21 from the retaining groove 19, and the brake shoe 30 from the brake disc 31. The traction sheave 8 is now freed from its restraint. At this point, the motor 3 can drive the traction sheave 8 to rotate and pay out the line, thereby starting to lower the beam.

[0107] During the beam lowering process, the state of the steel box beam is adjusted by the electric hoist to make the bridge docking smooth and fit.

[0108] S5: The equipment returns to the parking position of the steel box girder and repeats steps S1-4, repeating the lifting and splicing to complete the bridge splicing.

[0109] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0110] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0111] 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 steel box girder bridge plate hoisting structure, characterized in that: The invention comprises a base (1), a traction wheel (8) is rotatably mounted on the base (1), and the traction wheel (8) is driven by a driving structure to rotate forward and reverse and brake; a steel strand (9) is wound around the traction wheel (8), and the steel strand (9) is driven by a sorting mechanism to be spirally wound back and forth on the traction wheel (8) in sequence, and a hanging frame (36) is fixed to the hanging end of the steel strand (9), and a plurality of hooks for hanging the steel box girder bridge plate are provided around the hanging frame (36); Static friction discs (15) are fixed on opposite sides of the hubs on both sides of the traction wheel (8), brackets (17) are fixed on opposite sides of the two static friction discs (15) on the base (1), dynamic friction discs (16) are slidably mounted on the brackets (17) along the axial direction of the traction wheel (8), and driving rods (18) are abutted on opposite sides of the two dynamic friction discs (16), and the driving rods (18) are rotatably mounted on the brackets (17). The driving rods (18) are driven by the telescopic rod (32) to deflect; The hubs on both sides of the traction wheel (8) are provided with a plurality of slots (19) in an annular array. A locking rod (21) corresponding to the slots (19) is rotatably mounted on the side of the hub of the traction wheel (8) on the base (1). The locking rod (21) always tends to move away from the slots (19) under the action of an elastic member (22). A pull rope (20) is provided at the end of the locking rod (21). The other end of the pull rope (20) is connected to the driving rod (18) against one end of the dynamic friction disc (16).

2. The steel box girder bridge plate hoisting structure according to claim 1, characterized in that: The locking rod (21) is movably arranged, and the locking rod (21) is suspended and installed on the side of the hub of the traction wheel (8) through an elastic member (22). A through groove for the lower end of the locking rod (21) to pass through is provided on the base (1), and a limiting member is provided at the lower end of the locking rod (21).

3. The steel box girder bridge plate hoisting structure according to claim 2, characterized in that: A steel cable (37) is provided at the lower end of the locking rod (21), the steel cable (37) passes through the through slot, and a limiting member is provided at the lower end of the steel cable (37).

4. The steel box girder bridge plate hoisting structure according to claim 1, characterized in that: The driving structure comprises a motor (3) fixed on a base (1) and a transmission box (4); a gear reduction mechanism (34) is provided in the transmission box (4); and a worm gear mechanism (33) is provided in the transmission box (4) between the gear reduction mechanism (34) and an output shaft of the motor (3).

5. The steel box girder bridge plate hoisting structure according to claim 4, characterized in that: The base (1) is also provided with a brake mechanism (35) for assisting the motor (3) in braking. The brake mechanism (35) includes a stand mounted on the base (1). A pressure rod (24) is rotatably mounted on the upper end of the stand. The pressure rod (24) is driven to deflect back and forth by a telescopic rod (23) rotatably mounted on the base (1). A rocker (25) is rotatably mounted on the middle of the pressure rod (24). A truss rod (26) is provided at the end of the rocker rod (25). The truss rod (26) A V-shaped frame (27) is inserted on the upper portion, and a brake 1 (28) is rotatably connected to the bending portion of the V-shaped frame (27), and the other end of the V-shaped frame (27) is rotatably connected to a connecting rod (41), and the other end of the connecting rod (41) is rotatably connected to a brake 2 (29). Both the brake 1 (28) and the brake 2 (29) are rotatably mounted on the bracket (17) and symmetrically arranged along the output axis of the motor (3). Brake shoes (30) are provided on both the brake 1 (28) and the brake 2 (29).

6. The steel box girder bridge plate hoisting structure according to claim 5, characterized in that: A brake disc (31) is fixed on the output shaft of the motor (3), and a first brake (28) and a second brake (29) are symmetrically arranged along both sides of the brake disc (31).

7. The steel box girder bridge plate hoisting structure according to claim 1, characterized in that: The sorting mechanism includes a reciprocating screw (10) rotatably mounted on the side of the traction wheel (8), the reciprocating screw (10) and the traction wheel (8) are axially arranged parallel to each other, a wire arrangement ring (11) is threadedly mounted on the reciprocating screw (10) and slides horizontally relative to the base (1), a wire ring (12) is fixed on the base (1) on the side of the reciprocating screw (10) away from the traction wheel (8), and two wire wheels (13) are vertically symmetrically mounted on the side of the wire ring (12) away from the wire arrangement ring (11), and an annular groove is provided on the outer edge surface of the two wire wheels (13), and the hanging end of the steel strand (9) passes through the annular groove of the wire arrangement ring (11), the wire ring (12), and the guide wheel in sequence.

8. The steel box girder bridge plate hoisting structure according to claim 3, characterized in that: The outer edge surfaces of the hubs on both sides of the traction wheel (8) are bent in opposite directions.

9. The steel box girder bridge plate hoisting structure according to claim 1, characterized in that: A plurality of electric hoists are provided around the lower end of the base (1), and the output ends of the electric hoists are respectively hooked to the hanging frames (36).

10. A method for hoisting steel box girder bridge plates, characterized in that: include: S1: Pre-hanging of the lower spreader; S2: Reeling and lifting the steel box girder; S3: displacement adjustment of steel box girder; S4: Assemble steel box girder; S5: The equipment returns to the parking position of the steel box girder and repeats steps S1-4, repeating the lifting and splicing to complete the bridge splicing.

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