Precast concrete box girder hoist with leveling function

Abstract

The present invention relates to the field of box girder lifting equipment, and more particularly to a prefabricated concrete box girder lifting device with a leveling function. The device comprises a crossbeam, wherein four top corners of the crossbeam are provided with lifting rings, a mounting post is rotatably provided on the crossbeam, and four winding drums are rotatably mounted on the mounting post, each of which is wound with a lifting rope. The crossbeam is also provided with a support column, and four electric self-locking devices electrically connected to a control system are vertically mounted on the support column. One end of the lifting rope passes through the corresponding lifting ring, and the other end passes through the corresponding electric self-locking device. The crossbeam is also provided with a fixed column, and a first leveling assembly corresponding to each lifting rope is provided on the fixed column. The first leveling assembly includes a plurality of coaxial turntables rotatably mounted on the fixed column, and a plurality of hanging rings are circumferentially provided on the outer wall of each turntable. The lifting rope is provided with a hook for hanging on the hanging ring of the corresponding first leveling assembly. The present application has the advantage of being able to achieve leveling of the box girder.

Description

Technical Field

[0001] The invention relates to the field of box beam hoisting equipment, in particular to a concrete prefabricated box beam hoist with a leveling function. Background Art

[0002] A box girder is a type of beam used in bridge engineering. It is hollow inside and can be prefabricated in the factory and then transported to the construction site for on-site assembly. It has the advantages of accelerating project progress and saving construction time.

[0003] Chinese patent publication number CN107215773B discloses a prefabricated concrete box girder hoist. The device comprises a horizontal beam with two vertical positioning holes. Each end of the horizontal beam is connected to a vertical beam positioned below the horizontal beam. An extrusion block is mounted on the vertical beam and positioned below the horizontal beam. The extrusion block has vertical holes matching the vertical beams, and the vertical beam is inserted through its lower end into the vertical holes of the extrusion block. The extrusion block also has fixing holes located directly below the positioning holes.

[0004] It is inevitable that the box girder will tilt during the hoisting process, but it is difficult for the above-mentioned hoisting equipment to level the tilted box girder, which may result in poor hoisting effect of the box girder and has obvious shortcomings. Summary of the Invention

[0005] In order to improve the problem that it is difficult for a hoist to level the box girder, the present application provides a prefabricated concrete box girder hoist with a leveling function.

[0006] The present application provides a concrete prefabricated box beam hoist with a leveling function, which adopts the following technical solutions:

[0007] A concrete prefabricated box beam hoist with a leveling function comprises a crossbeam, wherein four top corners of the crossbeam are respectively provided with lifting rings, a mounting column is rotatably provided on the crossbeam, four winding drums are rotatably sleeved on the mounting column, and a lifting rope is wound on each of the winding drums, and a support column is also provided on the crossbeam, and four electric self-locking devices electrically connected to a control system are vertically provided on the support column, wherein one lifting rope corresponds to one lifting ring and one electric self-locking device, and one end of the lifting rope passes through the corresponding lifting ring, and the other end passes through the corresponding electric self-locking device.

[0008] Using this technical solution, a crane hoists the box girder using a sling. Workers then use testing equipment to check whether the box girder is tilted, its direction, and its angle. The control system then releases the electric lock from the sling, allowing the sling to move relative to the lock. Once the box girder is level, the lock re-engages the sling. This method allows the box girder to be leveled, improving the lifting efficiency of the sling.

[0009] Optionally, a mounting seat is further provided on the crossbeam, and a motor electrically connected to a control system is provided on the mounting seat, and an output shaft of the motor passes through the mounting seat and is coaxially connected to the end of the mounting column.

[0010] By adopting the above technical solution, when the hoisting device completes the lifting of the box girder, the control system starts the motor, the output shaft of the motor drives the installation column to rotate, and the installation column drives the winding drum to rotate through friction, thereby reeling in the unwound lifting rope, thereby facilitating the transportation of the hoisting device.

[0011] Optionally, a fixed column is further provided on the crossbeam, and a first leveling component corresponding to each of the lifting ropes is provided on the fixed column, and the first leveling component includes several coaxial turntables rotatably mounted on the fixed column, and the diameters of several turntables corresponding to the same group of the first leveling components gradually increase along the axial direction of the fixed column, and a plurality of hanging rings are circumferentially provided on the outer side wall of each turntable, and the lifting rope is provided with a hook for hanging on the hanging ring corresponding to the first leveling component.

[0012] By adopting the above technical solution, workers calculate the length of each rope that needs to be unwound in advance according to the inclination of the box girder, and then hang the hook on the hanging ring of the appropriate turntable to keep the rope taut. After that, the electric self-locking device releases the lock on the rope. The force of the box girder causes multiple ropes to move at the same time. The ropes pull the corresponding turntable to rotate until the ropes wound on the turntable are completely pulled out. Then the electric self-locking device locks the rope again.

[0013] Optionally, four second leveling components are provided between the support column and the fixed column, one lifting rope corresponds to one second leveling component, the second leveling component includes at least one transition rod plugged into the crossbeam, and the lifting rope is sequentially wrapped around each corresponding transition rod.

[0014] By adopting the above technical solution, workers can remove a transition rod from each second leveling assembly, and the length of the transition rod released can be used again for leveling. The installation of the above second leveling assembly allows workers to level the box girder multiple times, thereby improving the accuracy of box girder leveling.

[0015] Optionally, the diameter of at least one of the transition rods of the same group of the second leveling assemblies gradually decreases along the direction from the fixing column to the supporting column.

[0016] By adopting the above technical solution, as multiple leveling operations are performed, the length of the transition rod for releasing the sling gradually becomes shorter, which is beneficial to reducing the error in the leveling process.

[0017] Optionally, the transition rod is rotationally engaged with the crossbeam.

[0018] By adopting the above technical solution, during the leveling process, the unwinding of the lifting rope drives the transition rod to rotate, which is beneficial to reducing the possibility of damage to the lifting rope and the transition rod due to wear.

[0019] Optionally, a balancing seat is provided between the supporting column and the fixing column, and the top end of each transition rod slides through the balancing seat.

[0020] By adopting the above technical solution, the balance seat can play a certain role in restraining and supporting the transition rod, reducing the possibility of the transition rod being damaged by bending and deformation due to tension.

[0021] Optionally, the number of windings of the suspension rope on at least one transition rod of the same group of the second leveling components gradually decreases along the direction from the fixing column to the supporting column.

[0022] By adopting the above technical solution, the length of the released rope on the corresponding transition rod can be shortened during multiple leveling, and the error of the multiple leveling results gradually becomes smaller, thereby improving the leveling effect of the beam.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The crane hoists the box girder using a lifting rope. Workers then use testing equipment to check whether the box girder is tilted, the direction of tilt, and the angle of tilt. The control system then releases the electric locking device from the lifting rope, moves relative to the electric locking device, and once the box girder is level, the electric locking device re-locks the lifting rope. This method allows the box girder to be leveled, thereby improving the lifting efficiency of the lifting equipment.

[0025] 2. The worker removes a transition rod from each second leveling assembly. The released length of the transition rod can be used again for leveling. With the above-mentioned second leveling assembly, the worker can level the box girder multiple times, thereby improving the accuracy of box girder leveling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of Example 1 of the present application.

[0027] Figure 2 This is an exploded view between the winding drums in Example 1 of the present application.

[0028] Figure 3 This is an exploded view of the balance seat and transition rod bracket in Example 1 of the present application.

[0029] Figure 4 It is a schematic diagram of the structure between the transition rod and the suspension rope in Example 2 of the present application.

[0030] Explanation of the accompanying symbols: 1. Beam; 2. Lifting ring; 3. Mounting column; 4. Winding reel; 5. Lifting rope; 6. Support column; 7. Electric self-locking device; 8. Mounting seat; 9. Motor; 10. Fixed column; 11. Turntable; 12. Hanging ring; 13. Hook; 14. Transition rod; 15. Balance seat. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] An embodiment of the present application discloses a prefabricated concrete box girder hanger with a leveling function.

[0033] Example 1

[0034] Reference Figure 1 and Figure 2 The concrete prefabricated box beam hanger with a leveling function includes a beam 1, and four top corners of the upper surface of the beam 1 are respectively welded with lifting rings 2.

[0035] A vertical mounting post 3 is arranged at the center of the upper surface of the beam 1, and the bottom end of the mounting post 3 rotates and penetrates into the beam 1. Four winding drums 4 are rotatably sleeved on the mounting post 3, and a suspension rope 5 is wound on each winding drum 4.

[0036] A vertically arranged support column 6 is welded to the upper surface of the beam 1 at a position next to the mounting column 3 . Four vertically distributed electric self-locking devices 7 are bolted to the support column 6 . The electric self-locking devices 7 are electrically connected to the control system.

[0037] A lifting rope 5 corresponds to a lifting ring 2 and an electric self-locking device 7. One end of the lifting rope 5 passes through the corresponding lifting ring 2 and is connected to the lifting crane in the prior art, and the other end passes through the corresponding electric self-locking device 7.

[0038] Reference Figure 1 and Figure 2 During hoisting, the electric self-locking device 7 locks the lifting rope 5, so that the crane lifts the beam 1 through four lifting ropes 5, thereby realizing the hoisting of the box beam.

[0039] During the hoisting process, workers use detection equipment to detect whether beam 1 is tilted, the direction of tilt, and the angle of tilt, and then level beam 1 based on the above information. Adjusting the horizontality of beam 1 is to adjust the horizontality of the box beam.

[0040] During leveling, the worker releases the lock of the electric self-locking device 7 on the rope 5 through the control system. The force exerted by the beam 1 on the rope 5 causes the rope 5 and the electric self-locking device 7 to move relative to each other, causing the winding drum 4 to rotate. After the beam 1 is leveled, the electric self-locking device 7 relocks the corresponding rope 5.

[0041] Reference Figure 1 and Figure 2 A mounting seat 8 is also bolted to the crossbeam 1, and a motor 9 electrically connected to the control system is bolted to the mounting seat 8. The output shaft of the motor 9 passes through the mounting seat 8 and is coaxially connected to the top of the mounting column 3 through a flange.

[0042] After the lifting device is hoisted, the output shaft of the motor 9 drives the four winding drums 4 to rotate through friction, thereby reeling in the unwound lifting rope 5 for easy transportation.

[0043] Reference Figure 2 and Figure 3 Since leveling the beam 1 does not only require operating a single suspension rope 5, it is often necessary to reel in and unreel multiple suspension ropes 5. In the prior art, the reeling and unreeling of multiple suspension ropes 5 are mostly performed in steps. Therefore, during the leveling process, it is often the case that some suspension ropes 5 are not stressed while the rest of the suspension ropes 5 are stressed.

[0044] Taking into account the actual situation of this application, the weight of the prefabricated concrete box girder itself is relatively large, not to mention the weight of the hoist itself. Therefore, if the step-by-step operation method of multiple hoisting ropes 5 in the existing technology is adopted, some of the hoisting ropes 5 may be subjected to excessive force and break, which may cause a high possibility of accidents.

[0045] Reference Figure 2 and Figure 3 For this purpose, a horizontally arranged fixed column 10 is also arranged on the beam 1, and a first leveling component corresponding to each lifting rope 5 is provided on the fixed column 10. The first leveling component includes several coaxial turntables 11 rotatably sleeved on the fixed column 10.

[0046] The diameters of several turntables 11 corresponding to the same group of first leveling components gradually increase along the axial direction of the fixed column 10. Multiple hanging rings 12 are circumferentially welded on the outer wall of each turntable 11. A hook 13 is attached to the other end of the lifting rope 5 relative to the lifting crane. The hook 13 is used to hang on the hanging ring 12 corresponding to the first leveling component.

[0047] Reference Figure 2 and Figure 3 The worker calculates the length of each rope 5 that needs to be unwound according to the inclination direction and angle of the beam 1, and hangs the hook 13 on the hanging ring 12 of the turntable 11 of appropriate diameter, and keeps the rope 5 between the hook 13 and the electric self-locking device 7 in a tensioned state.

[0048] Afterwards, the electric self-locking device 7 first releases the lock on the rope 5, and the force of the box girder causes the corresponding multiple ropes 5 to be unwound at the same time. The rope 5 pulls the corresponding turntable 11 to rotate on the fixed column 10 through the hook 13 until all the ropes 5 wound on the turntable 11 are pulled out, and then the electric self-locking device 7 resumes the lock on the rope 5.

[0049] By hooking each lifting rope 5 to the diameter difference of different turntables 11, the beam 1 is leveled. During the leveling process of the beam 1, each lifting rope 5 is continuously stressed, so the force on the lifting rope 5 is relatively stable, thereby reducing the possibility of its breakage and improving the safety of the lifting equipment.

[0050] Reference Figure 2 and Figure 3 Taking into account factors such as the different arrangement heights and paths of each suspension rope 5, there is a certain error in the leveling result. Therefore, one leveling can only reduce the tilt amplitude of the beam 1, and cannot make the beam 1 leveled in place in one go.

[0051] Reference Figure 2 and Figure 3 To this end, four second leveling assemblies are arranged between the support column 6 and the fixed column 10, one for each suspension rope 5. The second leveling assembly includes at least one transition rod 14 vertically plugged into the crossbeam 1, with the suspension rope 5 looped around each corresponding transition rod 14.

[0052] Since the suspension rope 5 is wound around each corresponding transition rod 14 to a certain length, the worker only needs to remove one transition rod 14 at a time. The length of the suspension rope 5 released from the transition rod 14 is sufficient for the worker to re-attach the hook 13. With the above arrangement, the beam 1 can be leveled multiple times to ensure that the beam 1 is adjusted to a horizontal position, which is conducive to improving the leveling effect of the beam 1.

[0053] Reference Figure 2 and Figure 3 , because workers perform leveling multiple times, the second leveling assembly only needs to remove one transition rod 14 each time. During the leveling process, the unwinding of the sling rope 5 will generate greater friction with the remaining transition rods 14. Over time, both the sling rope 5 and the transition rods 14 may be severely damaged.

[0054] To this end, the bottom end of the transition rod 14 rotates and penetrates into the crossbeam 1, so that when the rope 5 is unwound, the rope 5 can drive the transition rod 14 to rotate. On the one hand, this is conducive to improving the smoothness of unwinding the rope 5, and on the other hand, it can also reduce the possibility of damage to the rope 5 and the transition rod 14.

[0055] Reference Figure 2 and Figure 3 A balancing seat 15 is bolted between the support column 6 and the fixed column 10. The top end of each transition rod 14 slides through the balancing seat 15. The balancing seat 15 imposes certain constraints on the top end of the transition rod 14, reducing the possibility of the transition rod 14 being damaged by bending and deformation due to tension.

[0056] Reference Figure 2 and Figure 3 In the process of workers achieving leveling multiple times, the inclination amplitude of the beam 1 will gradually become smaller, and the leveling error will gradually become smaller. If the length of the suspension rope 5 released by the transition rod 14 is long, it will easily lead to a larger leveling error.

[0057] To this end, the diameter of at least one transition rod 14 of the same set of second leveling assemblies gradually decreases along the direction from the fixed column 10 to the support column 6. In this case, the number of turns of the suspension rope 5 wound on each transition rod 14 is the same.

[0058] During multiple leveling, workers also pull out the transition rods 14 in sequence from the fixed column 10 to the support column 6. The length of the released suspension rope 5 on the corresponding transition rod 14 becomes shorter and shorter during multiple leveling. This can make the error of the leveling results smaller and smaller as the multiple leveling proceeds, which is beneficial to improving the leveling effect of the beam 1.

[0059] The working principle of Example 1 is as follows: a worker uses detection equipment to detect whether the crossbeam 1 is tilted. Based on the tilt direction and angle of the crossbeam 1, the worker calculates the required unwinding length of each rope 5. The worker then attaches the hook 13 to the hook ring 12 of the turntable 11 of the appropriate diameter, maintaining the rope 5 taut between the hook 13 and the electric self-locking device 7. The control system then releases the lock on the ropes 5. The force exerted by the crossbeam 1 causes multiple ropes 5 to unwind simultaneously, and the turntable 11, transition bar 14, and mounting column 3 all rotate relative to each other until the ropes 5 wound on the turntable 11 are completely unwound. Finally, the electric self-locking device 7 re-tightens the ropes 5.

[0060] When the beam 1 remains tilted after the first leveling, the worker removes the transition rod 14 of each second leveling component in sequence along the direction from the fixed column 10 to the support column 6, and re-hangs the hook 13 on the hanging ring 12 of the turntable 11 of appropriate diameter, repeats the above operation method, and leveles the beam 1 multiple times until the box beam remains horizontal.

[0061] Example 2

[0062] Reference Figure 4 The difference between this embodiment and embodiment 1 is that the number of windings of the suspension rope 5 on at least one transition rod 14 of the same group of second leveling components gradually decreases along the direction from the fixed column 10 to the support column 6.

[0063] This method can also achieve the effect of shortening the length of the release rope 5 on the corresponding transition rod 14 during multiple leveling, and the error of multiple leveling results gradually becomes smaller, thereby improving the leveling effect of the beam 1.

[0064] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A concrete prefabricated box beam hanger with a leveling function, comprising a crossbeam (1), wherein four top corners of the crossbeam (1) are respectively provided with lifting rings (2), characterized in that: A mounting post (3) is rotatably provided on the crossbeam (1), and four winding drums (4) are rotatably sleeved on the mounting post (3), and a suspension rope (5) is wound around each of the suspension drums (4). A support post (6) is also provided on the crossbeam (1), and four electric self-locking devices (7) electrically connected to a control system are vertically provided on the support post (6). One suspension rope (5) corresponds to one suspension ring (2) and one electric self-locking device (7), and one end of the suspension rope (5) passes through the corresponding suspension ring (2), and the other end passes through the corresponding electric self-locking device (7); The crossbeam (1) is further provided with a mounting seat (8), and a motor (9) electrically connected to a control system is provided on the mounting seat (8), and an output shaft of the motor (9) passes through the mounting seat (8) and is coaxially connected to the end of the mounting column (3); The crossbeam (1) is further provided with a fixed column (10), and the fixed column (10) is provided with a first leveling assembly corresponding to each of the suspension ropes (5). The first leveling assembly includes a plurality of coaxial turntables (11) rotatably sleeved on the fixed column (10), and the diameters of the turntables (11) corresponding to the first leveling assembly in the same group gradually increase along the axial direction of the fixed column (10). A plurality of hanging rings (12) are circumferentially provided on the outer side wall of each of the turntables (11), and the suspension rope (5) is provided with a hook (13) for hanging on the hanging ring (12) corresponding to the first leveling assembly; Four second leveling components are further provided between the support column (6) and the fixed column (10), one of the lifting ropes (5) corresponds to one of the second leveling components, the second leveling components comprising at least one transition rod (14) plugged into and fitted on the crossbeam (1), the lifting rope (5) being sequentially wound around each corresponding transition rod (14).

2. The concrete prefabricated box beam lifting device with leveling function according to claim 1 is characterized in that: The diameter of at least one transition rod (14) of the same group of the second leveling components gradually decreases along the direction from the fixing column (10) to the supporting column (6).

3. The concrete prefabricated box beam lifting device with leveling function according to claim 1, characterized in that: The transition rod (14) is rotationally matched with the crossbeam (1).

4. The concrete prefabricated box beam lifting device with leveling function according to claim 1, characterized in that: A balancing seat (15) is provided between the supporting column (6) and the fixing column (10), and the top end of each transition rod (14) slides through the balancing seat (15).

5. The concrete prefabricated box beam lifting device with leveling function according to claim 1, characterized in that: The number of windings of the suspension rope (5) on at least one transition rod (14) of the same group of the second leveling components gradually decreases along the direction from the fixing column (10) to the supporting column (6).

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