Reinforcement cage lowering device and method

Abstract

The invention belongs to the technical field of bridge construction, and discloses a steel reinforcement cage lowering device and method. The steel reinforcement cage lowering device comprises a lowering frame, a hoisting lowering assembly, a temporary hoisting assembly and a hanging assembly, and hanging and lowering of a steel reinforcement cage are achieved alternately between hoisting structures and the steel reinforcement cage in different construction stages in sequence; and stable transfer of the gravity center of the reinforcement cage is realized section by section, so that accurate butt joint and stable lowering of each section of reinforcement cage are realized. And the whole reinforcement cage can be integrally hoisted without depending on large hoisting equipment, so that the stability of lowering operation and the construction safety are effectively improved. By adopting an interval connection mode with the lifting lugs at the top end of the reinforcement cage, the unbalance loading risk and the swing amplitude in the lifting process can be obviously reduced, the posture of the reinforcement cage is effectively controlled, and the lifting precision and the butt joint quality are improved. The steel bar lowering device is simple in structure, convenient to assemble and flexible to disassemble, the efficiency and safety of steel bar cage lowering construction can be remarkably improved, repeated use can be achieved, the construction cost is further reduced, and the economical efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly to a device and method for lowering a steel reinforcement cage. Background Art

[0002] A steel reinforcement cage is a three-dimensional spatial structure formed by connecting multiple steel bars through welding, binding or other means. It mainly serves as the skeleton in concrete components to enhance the tensile, shear and overall stability of the structure, and is an essential part of reinforced concrete structures. During the construction of bridge piles, especially during the construction of piles for super-large bridges such as cross-sea bridges, the tonnage of the steel reinforcement cage of the pile foundation can often reach more than a hundred tons.

[0003] In the face of super-large-tonnage steel reinforcement cages, traditional construction methods usually rely on large lifting equipment such as floating cranes, crawler cranes, gantry cranes, etc. for hoisting and lowering operations. Such equipment usually has high requirements for the space of the construction site, and sufficient operating radius, transfer channels, and stable operating platforms need to be reserved, which are often difficult to meet in areas with limited construction conditions, narrow offshore platforms or complex geology; moreover, the processes of equipment mobilization, assembly, disassembly, etc. are time-consuming and laborious, further resulting in an extended construction period and low construction efficiency; in addition, the rental cost of large lifting equipment is high, causing great pressure on the overall budget. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for lowering a steel reinforcement cage to solve the problems of large equipment footprint, complex assembly and high cost existing in the prior art, with small footprint, convenient assembly, flexible disassembly and assembly, which can significantly improve the efficiency and safety of the construction of lowering the steel reinforcement cage, effectively adapt to the working conditions requirements of space-limited or complex construction environments, and have low cost.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A device for lowering a steel reinforcement cage, the steel reinforcement cage is processed in sections, including:

[0007] A lowering frame, including a temporary support section, a guiding section and a hoisting section, which are fixedly connected in sequence from bottom to top. The temporary support section is arranged on the construction platform, and the cross-section of the guiding section is in a C-shaped structure;

[0008] Lifting and lowering assembly, including a winch, a pulley lifting member and at least four lifting lugs. The winches are relatively arranged on both sides of the temporary support section on the construction platform. The pulley lifting member is symmetrically installed on the lifting section along the central axis in the length direction of the lifting section. The lifting lugs are fixedly arranged at intervals circumferentially at the top end of the steel reinforcement cage. The output end of the pulley lifting member is detachably connected to the lifting lugs at intervals to form a staggered lifting structure. The output end of the winch is connected to the pulley lifting member to drive the pulley lifting member to drive the steel reinforcement cage to be lowered along the guiding section to the temporary support section.

[0009] Temporary lifting assembly, installed on the temporary support section and capable of being detachably connected to the free space of the top end of the steel reinforcement cage where the lifting lugs are not provided.

[0010] Suspension assembly, capable of being detachably connected to the top end of the steel reinforcement cage, and both ends thereof are in contact with the construction platform, for transferring and suspending the steel reinforcement cage on the construction platform.

[0011] Further, the lifting and lowering assembly further includes a reaction frame. One end of the reaction frame is fixedly connected to the lowering frame, and the other end thereof is fixedly connected to the side of the winch away from the lowering frame.

[0012] Further, the pulley lifting member includes a lifting rope, a pulley block and a plurality of first hooks. One end of the lifting rope is connected to the output end of the winch, and the other end thereof can be wound around the pulley block and connected to the first hook. The first hook is detachably connected to the lifting lug. The winch can synchronously adjust the retraction and extension of the plurality of first hooks.

[0013] Further, the pulley lifting member further includes a top support roller. The top support roller is fixedly arranged on the guiding section, and its roller end can support the lifting rope along the extending direction of the width of the lowering frame.

[0014] Further, the temporary lifting assembly includes a plurality of fixed lifting members. The plurality of fixed lifting members are fixedly arranged at the edges of the cross-section at the same horizontal height of the temporary support section.

[0015] Further, the fixed lifting member includes a lifting part, a lifting rope and a second hook. The lifting part is fixed to the edge of the cross-section of the temporary support section. The lifting rope surrounds the lifting part and is connected to the second hook. The second hook is detachably connected to the free space of the top end of the steel reinforcement cage where the lifting lugs are not provided.

[0016] Further, the suspension assembly includes at least two crossbeam suspension members. The at least two crossbeam suspension members are arranged side by side at intervals along the extending direction of the diameter of the steel reinforcement cage, and can all be anchored to the top end of the steel reinforcement cage. Both ends of the crossbeam suspension member can be in contact with the construction platform.

[0017] Furthermore, the crossbeam suspension member includes a crossbeam, a plurality of suspension bars, and a plurality of threaded sleeves. The crossbeam is arranged radially along the reinforcement cage. The plurality of suspension bars are arranged at intervals along the length direction of the crossbeam and can penetrate through the crossbeam to be fixedly connected to the top end of the reinforcement cage. The end of the suspension bar away from the reinforcement cage is provided with an external thread, and the threaded sleeve is threadedly connected to the suspension bar and abuts against the crossbeam.

[0018] Furthermore, the reinforcement cage lowering device further includes an operation platform and a ladder. The operation platform is arranged at the height position of the connection between the hoisting section and the guiding section. The ladder is arranged along the length direction of the lowering frame. One end of the ladder is connected to the operation platform, and the other end is connected to the construction platform.

[0019] A method for lowering a reinforcement cage, using the reinforcement cage lowering device as described in any one of the above, includes the following steps:

[0020] S1: After the reinforcement cage is processed in sections and transported to the construction site, at least four of the lifting lugs are arranged at intervals along the circumference of the top end of each section of the reinforcement cage; the lifting equipment hoists the reinforcement cage and places it into the lowering frame through the notch position of the C-shaped structure in the guiding section;

[0021] S2: The output end of the pulley hoisting member is connected to the lifting lugs at the top end of the reinforcement cage at intervals, and the lifting equipment is removed;

[0022] S3: The winch adjusts the pulley hoisting member to lower this section of the reinforcement cage to the height position of the temporary support section;

[0023] S4: The temporary hoisting assembly is connected to the remaining lifting lugs at the top end of the reinforcement cage, and the connection between the pulley hoisting member and the lifting lugs is removed;

[0024] S5: The lifting equipment and the hoisting and lowering assembly repeat steps S1 to S4 to hoist the next section of the reinforcement cage and lower it to the docking position with the top end of the previous section of the reinforcement cage to complete the connection of the upper and lower sections of the reinforcement cage;

[0025] S6: Remove the connection between the temporary hoisting assembly and the previous section of the reinforcement cage, and continue to lower the integrally connected reinforcement cage through the hoisting and lowering assembly to the height position of the temporary support section. Repeat step S5 until all sections are connected and lowered;

[0026] S7: After all sections are connected, fixedly connect the suspension assembly to the top end of the reinforcement cage, and the suspension assembly is supported on the construction platform; remove the connection between the temporary hoisting assembly and the reinforcement cage;

[0027] S8: The lowering framework moves to the position of the next construction platform, and the lowering operation of the next group of the steel reinforcement cages is carried out.

[0028] Advantages of the present invention:

[0029] The present invention provides a steel reinforcement cage lowering device and method. The steel reinforcement cage lowering device includes a lowering framework, a hoisting and lowering assembly, a temporary hoisting assembly, and a suspension assembly. The suspension and lowering are alternately realized between the hoisting and lowering assembly, the temporary hoisting assembly, and the suspension assembly and the steel reinforcement cage at different construction stages, and the stable transfer of the center of gravity of the steel reinforcement cage is realized section by section, so as to realize the precise docking and stable lowering of each section of the steel reinforcement cage. It is not necessary to rely on large hoisting equipment to hoist the whole steel reinforcement cage integrally, effectively improving the stability and construction safety of the lowering operation. By adopting an intermittent connection method with the lifting lugs at the top of the steel reinforcement cage, the risk of eccentric load and the swing amplitude during hoisting can be significantly reduced, effectively controlling the posture of the steel reinforcement cage and improving the hoisting accuracy and docking quality. It supports the sectional transportation of the steel reinforcement cage and the on-site sectional assembly, with a small floor area, which can greatly reduce the overall transportation and hoisting difficulty. The used lowering device has a simple structure, is convenient to assemble and disassemble flexibly, can significantly improve the efficiency and safety of the steel reinforcement cage lowering construction, and is especially suitable for working conditions with limited space or complex construction environments. At the same time, the lowering device can be reused, further reducing the construction cost and improving the economy. Description of the Drawings

[0030] Figure 1 is the structural schematic diagram of the steel reinforcement cage lowering device in the present invention;

[0031] Figure 2 is the side view of the steel reinforcement cage lowering device in the present invention;

[0032] Figure 3 is Figure 2 the sectional view at A-A in

[0033] Figure 4 is Figure 2 the sectional view at B-B in

[0034] Figure 5 is Figure 2 the sectional view at C-C in

[0035] Figure 6 is Figure 2 the sectional view at D-D in

[0036] Figure 7 is the assembly drawing of the steel reinforcement cage and the lifting lug in the present invention;

[0037] Figure 8 is the structural schematic diagram of the lifting lug in the present invention;

[0038] Figure 9It is the assembly drawing of the steel reinforcement cage and the lifting beam suspension part of the present invention;

[0039] Figure 10 It is the structural schematic diagram of the lifting beam suspension part in the present invention;

[0040] Figure 11 It is the flow chart of the method for lowering the steel reinforcement cage of the present invention.

[0041] In the figure:

[0042] 100, steel reinforcement cage;

[0043] 1, lowering frame; 11, temporary support section; 12, guiding section; 13, hoisting section;

[0044] 2, hoisting and lowering assembly; 21, winch; 22, pulley hoisting piece; 221, lifting rope; 222, pulley block; 223, first hook; 224, top support roller; 23, lifting lug; 24, reaction frame;

[0045] 3, fixed hoisting piece; 31, hoisting part; 32, hoisting rope; 33, second hook; 4, lifting beam suspension part; 41, lifting beam; 42, hoisting bar; 43, threaded sleeve; 44, backing plate; 5, operation platform; 6, ladder; 7, construction platform. Specific embodiments

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0047] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0049] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0050] Please refer to Figures 1 to 10 As shown, the entire steel reinforcement cage 100 is formed into multiple segmented steel reinforcement cages 100 by means of segmented processing. The construction platform 7 is arranged above the pouring position and is provided with a lowering channel for the steel reinforcement cage 100 to pass through. The present invention provides a steel reinforcement cage lowering device, which includes a lowering frame 1, a hoisting and lowering assembly 2, a temporary hoisting assembly and a suspension assembly. The lowering frame 1 includes a temporary supporting section 11, a guiding section 12 and a hoisting section 13, which are fixedly connected in sequence from bottom to top. The temporary supporting section 11 is arranged on the construction platform 7, and the cross-section of the guiding section 12 is in a C-shaped structure; the hoisting and lowering assembly 2 includes a winch 21, a pulley hoisting member 22 and at least four lifting lugs 23. The winch 21 is relatively arranged on both sides of the temporary supporting section 11 on the construction platform 7. The pulley hoisting member 22 is symmetrically installed on the hoisting section 13 along the central axis in the length direction of the hoisting section 13. The lifting lugs 23 are fixedly arranged at intervals along the circumference of the top end of the steel reinforcement cage 100; the output end of the pulley hoisting member 22 is detachably connected to the lifting lugs 23 at intervals to form a staggered hoisting structure. The output end of the winch 21 is connected to the pulley hoisting member 22 to drive the pulley hoisting member 22 to drive the steel reinforcement cage 100 to be lowered along the guiding section 12 to the temporary supporting section 11; the temporary hoisting assembly is installed on the temporary supporting section 11 and can be detachably connected to the spare lifting lugs 23 at the top end of the steel reinforcement cage 100. The hoisting connection points of the temporary hoisting assembly and the hoisting connection points of the pulley hoisting member 22 are staggered in space; the suspension assembly can be detachably connected to the top end of the steel reinforcement cage 100, and its two ends are in contact with the construction platform 7, and is used to transfer and suspend the steel reinforcement cage 100 on the construction platform 7.

[0051] First, lift the first section of the steel cage 100, and place the first section of the steel cage 100 into the lowering frame 1 through the notch position of the C-shaped structure of the guiding section 12. Use the pulley hoisting member 22 in the hoisting and lowering assembly 2 to connect with the top lug 23 of the first section of the steel cage 100 in an intermittent detachable connection manner. The so-called "intermittent connection method" means that only one of every two adjacent lugs 23 is selected for connection, and it is connected with the lug 23 according to the rule of connecting one and leaving one empty, so as to ensure that the hoisting force is evenly distributed at the top of the steel cage 100, improving the hoisting stability and operation efficiency. Subsequently, start the winch 21 to provide the driving force for lowering or lifting the pulley hoisting member 22, and drive the first section of the steel cage 100 to slowly lower to the position of the temporary support section 11 through the pulley hoisting member 22. At this time, detachably connect the temporary hoisting assembly with the remaining top lug 23 of the first section of the steel cage 100. By means of a spatially staggered arrangement, the lifting points of the temporary hoisting assembly are arranged in a staggered manner with the lifting points of the pulley hoisting member 22, so that the center of gravity of the steel cage 100 is smoothly transferred to the temporary hoisting assembly. Among them, through the double-set hoisting assembly arranged in an up-and-down staggered manner, the stability of the positioning of the steel cage 100 during the conversion is ensured, the smooth transfer of the center of gravity of the steel cage 100 is realized, which is convenient for accurately controlling the installation position of each section of the steel cage 100, improving the overall verticality and splicing accuracy, and enhancing the efficiency and safety of the construction of lowering the steel cage 100. After the transfer is completed, remove the connection between the pulley hoisting member 22 and the first section of the steel cage 100.

[0052] Next, the pulley hoisting member 22 hoists the second section of the steel cage 100, docks the bottom end of the second section of the steel cage 100 with the top end of the first section of the steel cage 100 hoisted by the temporary hoisting assembly and makes a fixed connection. After the connection is completed, remove the connection between the temporary hoisting assembly and the first section of the steel cage 100, and reuse the pulley hoisting member 22 to lower the combined first and second sections of the steel cage 100 as a whole, and lower the second section of the steel cage 100 to the temporary support section 11.

[0053] Repeat the above operation steps to hoist, dock and lower each section of the steel cage 100 one by one until all sections are spliced and fixedly connected.

[0054] Subsequently, fixedly connect the suspension assembly with the top end of the steel cage 100, and make both ends of the suspension assembly firmly abut against the construction platform 7. Finally, remove the connection between the temporary hoisting assembly and the steel cage 100, realize the overall transfer of the steel cage 100 and safely suspend it on the construction platform 7, transfer the steel cage lowering device to the position of the next construction platform 7, and carry out the lowering operation of the next group of steel cages 100.

[0055] The device for lowering the steel reinforcement cage does not require large-scale equipment to hoist and lower the overall steel reinforcement cage 100. It has a small occupied space, is convenient to assemble, disassemble and install, is flexible to move, can significantly improve the efficiency and safety of the construction of lowering the steel reinforcement cage 100, effectively adapt to the working conditions with limited space or complex construction environment, can be reused, and has a low cost.

[0056] It can be understood that the number of lifting lugs 23 can be but is not limited to four, six or eight, and no specific limitation is made here.

[0057] In addition, the temporary hoisting assembly can keep the axis position of the steel reinforcement cage 100 unchanged during the transfer process, which is convenient for the subsequent docking of the bottom of the next section of the steel reinforcement cage 100 with the top of this steel reinforcement cage 100.

[0058] As Figure 7 shown, exemplarily, 8 lifting lugs 23 are evenly spaced along the circumferential direction at the top end of each section of the steel reinforcement cage 100, and are numbered in sequence as: the first lifting lug 23, the second lifting lug 23, the third lifting lug 23, the fourth lifting lug 23, the fifth lifting lug 23, the sixth lifting lug 23, the seventh lifting lug 23 and the eighth lifting lug 23. During the hoisting operation, the pulley hoisting members 22 of the hoisting and lowering assembly 2 are respectively connected with the first, third, fifth and seventh lifting lugs 23 in an intermittent hoisting connection to complete the initial hoisting and the lowering of the steel reinforcement cage 100. After the steel reinforcement cage 100 is lowered to the position of the temporary supporting section 11 through the guiding section 12, the temporary hoisting assembly is successively connected with the remaining second, fourth, sixth and eighth lifting lugs 23 in a hoisting connection. After the connection is completed, the connection relationship between the pulley hoisting member 22 and the first, third, fifth and seventh lifting lugs 23 is removed to realize the stable transfer of the center of gravity of the steel reinforcement cage 100 from the pulley hoisting member 22 to the temporary hoisting assembly; Subsequently, the pulley hoisting member 22 is used to hoist the next section of the steel reinforcement cage 100 and make its bottom end accurately dock and fixedly connect with the top end of the previous section of the steel reinforcement cage 100. After the upper and lower two sections of the steel reinforcement cage 100 are docked, the connection between the temporary hoisting assembly and the steel reinforcement cage 100 is removed, and the center of gravity of the upper and lower two sections of the fixedly connected steel reinforcement cage 100 is transferred back to the pulley hoisting member 22 again. The pulley hoisting member 22 lowers the upper and lower two sections of the steel reinforcement cage 100 together to the position of the temporary supporting section 11. The hoisting, docking and lowering of each section of the steel reinforcement cage 100 are completed in sequence according to the above steps until all the sections of the steel reinforcement cage 100 are spliced. After the overall installation of the steel reinforcement cage 100 is completed, the suspension assembly is fixedly connected with the top end of the steel reinforcement cage 100, and both ends of the suspension assembly are reliably abutted against the construction platform 7, so as to finally transfer and suspend the center of gravity of the entire steel reinforcement cage 100 on the construction platform 7 to realize the stable positioning of the overall structure of the steel reinforcement cage 100. At this time, the device for lowering the steel reinforcement cage can be integrally transferred to the next construction area to carry out the lowering and splicing operation of the next group of steel reinforcement cages 100.

[0059] Specifically, the lowering frame 1 can be made of, but is not limited to, section steel. The temporary support section 11, the guiding section 12, and the hoisting section 13 are welded and fixed to each other in sequence. The section steel has good support and can bear the load of the super-large-tonnage steel reinforcement cage 100.

[0060] In other embodiments, the lowering frame 1 can also be made of section steels of different models to change its ultimate bearing capacity, so as to meet the lowering requirements of steel reinforcement cages 100 of different tonnages.

[0061] As Figure 1 shown, in order to make the winch 21 operate stably, the hoisting and lowering assembly 2 further includes a reaction frame 24. One end of the reaction frame 24 is fixedly connected to the lowering frame 1, and the other end thereof is fixedly connected to the side of the winch 21 away from the lowering frame 1. Wherein, the reaction frame 24 can provide a reverse supporting force during the operation of the winch 21, and effectively transfer the traction force generated by the winch 21 to the main body of the lowering frame 1, thereby preventing the winch 21 from shifting or tilting and ensuring the stable operation of the entire hoisting system.

[0062] Specifically, the reaction frame 24 can be made of, but is not limited to, section steel, and forms a triangular structure with the lowering frame 1 and the winch 21. When the winch 21 pulls the sliding hoisting member, a reverse acting force will be generated, and this force will attempt to pull the winch 21 body forward or tilt. One end of the reaction frame 24 is fixed on the lowering frame 1, and this position is stable and has been anchored. The other end is connected to the side of the winch 21 away from the lowering frame 1. The reaction frame 24, the lowering frame 1, and the winch 21 together form a stable triangular structure. The function of this triangular structure is similar to that of a triangular bracket. Through the geometric stability of the structure, the pulling force generated by the winch 21 is decomposed into a part that is transmitted to the lowering frame 1 through the reaction frame 24; the other part is jointly borne by the support of the lowering frame 1 body and the friction of the base, so that the traction force is enclosed within the system, the winch 21 will not move forward or tip over, and the structure maintains static equilibrium.

[0063] As Figure 2As shown, in some embodiments, the pulley hoisting member 22 includes a hoisting rope 221, a pulley block 222, and a plurality of first hooks 223. One end of the hoisting rope 221 is connected to the output end of the winch 21, and the other end thereof can be wound around the pulley block 222 and connected to the first hook 223. The first hook 223 is detachably connected to the lifting lug 23. The winch 21 can synchronously adjust the retraction and extension of the plurality of first hooks 223. Among them, the pulley block 222 includes a fixed pulley and a movable pulley. The movable pulley can effectively share the load, reduce the pulling force required for hoisting by half, reduce the load of the winch 21, and improve the hoisting efficiency. The fixed pulley can change the traction path, make the arrangement of the hoisting rope 221 more flexible, and is suitable for construction environments with limited space. The winch 21 is connected to the hook through the pulley block 222 and can synchronously adjust the retraction and extension of the first hook 223, enabling the smooth lifting and precise positioning of the steel reinforcement cage 100, facilitating the docking of each section and the control of the verticality. The detachable connection between the first hook 223 and the lifting lug 23 is convenient for quick loading and unloading, can be recycled in the hoisting of multiple sections of the steel reinforcement cage 100, improves the construction efficiency, and the connections of each structure are compact, and the connection method is simple and easy to operate.

[0064] Optionally, the pulley block 222 can but is not limited to using a tackle block, and no specific limitation is made here. The hoisting rope 221 can but is not limited to using a steel wire rope, and no specific limitation is made here.

[0065] As Figure 1 shown, to ensure the smooth sliding of the hoisting rope 221, the pulley hoisting member 22 further includes a top support roller 224. The top support roller 224 is fixedly provided on the guiding section 12, and its roller end can jack up the hoisting rope 221 along the extending direction of the width of the lowering frame 1. Through the setting of the top support roller 224, the hoisting rope 221 can be supported away from the surface of the lowering frame 1, preventing it from directly rubbing against the surface of the lowering frame 1, thereby effectively avoiding damage or breakage of the hoisting rope 221 caused by wear. At the same time, the rotating characteristic of the roller end itself also greatly reduces the sliding friction force with the hoisting rope 221, improving the safety and reliability of the pulley hoisting member 22.

[0066] Combined with Figure 1 and Figure 6 shown, optionally, the temporary hoisting assembly includes a plurality of fixed hoisting members 3. The plurality of fixed hoisting members 3 are fixedly provided at the cross-sectional edge of the temporary supporting section 11 at the same horizontal height. Among them, through the setting of the plurality of fixed hoisting members 3, the hoisting force can be dispersed and transmitted to the structural edge, effectively avoiding excessive local deformation or instability caused by excessive single-point stress. By arranging them at the same horizontal height, a balanced stress ring can be formed at the top of the steel reinforcement cage 100 to ensure that the stress at each connection point is uniform and synchronous during hoisting, avoiding torsion and deformation.

[0067] Specifically, the cross-section of the temporary support section 11 is rectangular, and a plurality of fixed lifting members 3 are respectively arranged at the middle positions of the edges of each rectangle, so that the force on the temporary support section 11 is more uniform, avoiding deformation of the temporary support section 11 due to uneven force, and improving the stability of the steel cage lowering device.

[0068] More specifically, the fixed lifting member 3 includes a lifting part 31, a lifting rope 32 and a second hook 33. The lifting part 31 is fixed to the edge of the cross-section of the temporary support section 11. The lifting rope 32 surrounds the lifting part 31 and is connected to the second hook 33. The second hook 33 is detachably connected to the spare lifting lug 23 at the top of the steel cage 100. Among them, the lifting part 31 serves as a fixed anchor point for the lifting rope 32, which can stably transfer the lifting load to the temporary support section 11, effectively preventing the lifting rope 32 from slipping, deviating or changing the force direction, and improving the reliability of the overall lifting system. The second hook 33 is a detachable structure, which is convenient for quickly connecting or releasing the steel cage 100 and improving the construction efficiency.

[0069] Optionally, the lifting part 31 includes at least two fixed lifting lugs and a pin rod. The fixed lifting lugs are fixedly arranged at the edge of the cross-section of the temporary support section 11. The pin rod passes through at least two fixed lifting lugs, and the lifting rope 32 can surround the pin rod and be connected to the second hook 33.

[0070] In other embodiments, the lifting part 31 includes a lifting ring, where the lifting ring is fixed to the edge of the cross-section of the temporary support section 11, and the lifting rope 32 can surround the lifting ring and be connected to the second hook 33.

[0071] In addition, the lifting rope 32 can but is not limited to being made of steel wire rope, and no specific limitation is made here.

[0072] Combined Figure 9 and Figure 10 As shown, in some embodiments, the suspension assembly includes at least two crossbeam suspension members 4. The at least two crossbeam suspension members 4 are arranged side by side at intervals along the radial extension direction of the steel cage 100, and can all be anchored to the top of the steel cage 100. Both ends of the crossbeam suspension member 4 can abut against the construction platform 7. Among them, the crossbeam suspension member 4 is anchored to the steel bars at the top of the steel cage 100, which can evenly distribute and transfer the overall weight of the steel cage 100 to the construction platform 7, ensuring the safety and stability of the entire structure.

[0073] Specifically, the crossbeam suspension member 4 includes a crossbeam 41, a plurality of hanger bars 42, and a plurality of threaded sleeves 43. The crossbeam 41 is arranged along the radial extension direction of the reinforcement cage 100. The plurality of hanger bars 42 are arranged at intervals along the length direction of the crossbeam 41 and can penetrate the crossbeam 41 and be anchored and connected to the top end of the reinforcement cage 100. The end of the hanger bar 42 away from the reinforcement cage 100 is provided with an external thread. The threaded sleeve 43 is threadedly connected to the hanger bar 42 and abuts against the crossbeam 41. Among them, one end of the hanger bar 42 forms a multi-point anchoring connection with the top end of the reinforcement cage 100, and the other end penetrates the crossbeam 41 and is locked and connected to the end of the crossbeam 41 through the threaded sleeve 43 to form a reliable axial supporting force, effectively supporting the weight of the entire reinforcement cage 100. And the threaded connection structure is convenient for quick installation and disassembly and can be reused.

[0074] Preferably, at least two hanger bars 42 are arranged at the connection position where the crossbeam 41 intersects the reinforcement cage 100. The plurality of hanger bars 42 are arranged at intervals along the width direction of the crossbeam 41, which can effectively enhance the connection stability between the reinforcement cage 100 and the crossbeam 41 and ensure uniform and stable force during the hoisting process.

[0075] Considering the problem of possible local stress concentration when the threaded sleeve 43 directly contacts the crossbeam 41, further, the crossbeam suspension member 4 further includes a backing plate 44. The backing plate 44 is arranged between the threaded sleeve 43 and the crossbeam 41 and is used to effectively increase the contact area, disperse the force, reduce the risk of local indentation and material damage, and improve the overall safety of the structural connection. Among them, the backing plate 44 can be but is not limited to a steel backing plate, and the specific material and structural form can be selected according to actual use requirements and are not limited herein.

[0076] Preferably, the crossbeam 41 is welded by two spliced I-beams, with high structural strength and strong load-bearing performance. Reinforcing plates can be welded at the opening positions of the crossbeam 41 to further improve the local structural strength, optimize the overall load-bearing performance of the crossbeam 41, and make it more stable and reliable under large-tonnage hoisting conditions.

[0077] Combined with Figure 1 、 Figure 4 、 Figure 5 and Figure 6 As shown, in some embodiments, the reinforcement cage lowering device further includes an operation platform 5 and a ladder 6. The operation platform 5 is arranged at the height position of the connection between the hoisting section 13 and the guiding section 12. The ladder 6 is arranged along the length direction of the lowering frame 1. One end of the ladder 6 is connected to the operation platform 5, and the other end is connected to the construction platform 7. Such a design facilitates the operator to climb onto the operation platform 5 through the ladder 6 to operate or repair the pulley hoisting member 22.

[0078] It can be understood that both the operation platform 5 and the ladder 6 are made by welding steel pipes and steel plates, with a certain stiffness, making the structure more stable.

[0079] As Figure 11 shown, the present invention also provides a method for lowering a steel reinforcement cage. Using the steel reinforcement cage lowering device in any of the above embodiments, the method includes the following steps:

[0080] S1: After the steel reinforcement cage 100 is processed in sections and transported to the construction site, at least four lifting lugs 23 are arranged at intervals along the circumference of the top end of each section of the steel reinforcement cage 100; The lifting equipment hoists the steel reinforcement cage 100 and places it into the lowering frame 1 through the notch position of the C-shaped structure of the guiding section 12;

[0081] S2: The output end of the pulley hoisting member 22 is connected to the lifting lug 23 at the top end of the steel reinforcement cage 100 at intervals, and the lifting equipment is removed;

[0082] S3: The winch 21 adjusts the pulley hoisting member 22 to lower the steel reinforcement cage 100 to the height position of the temporary support section 11;

[0083] S4: The temporary hoisting assembly is connected to the remaining lifting lugs 23 at the top end of the steel reinforcement cage 100, and the connection between the pulley hoisting member 22 and the lifting lug 23 is removed;

[0084] S5: The lifting equipment and the hoisting and lowering assembly 2 repeat steps S1 to S4 to hoist the next section of the steel reinforcement cage 100 and lower it to the docking position with the top end of the previous section of the steel reinforcement cage 100 to complete the connection of the upper and lower sections of the steel reinforcement cage 100;

[0085] S6: The connection between the temporary hoisting assembly and the previous section of the steel reinforcement cage 100 is removed, and the hoisting and lowering assembly 2 continues to lower the integrally connected steel reinforcement cage 100 to the height position of the temporary support section 11, and step S5 is repeated until all sections are connected and lowered;

[0086] S7: After all sections are connected, the suspension assembly is fixedly connected to the top end of the steel reinforcement cage 100, and the suspension assembly is borne on the construction platform 7; The connection between the temporary hoisting assembly and the steel reinforcement cage 100 is removed;

[0087] S8: The lowering frame 1 moves to the position of the next construction platform 7 to perform the lowering operation of the next group of steel reinforcement cages 100.

[0088] This method for lowering the steel cage realizes the alternation of suspension and lowering between the hoisting equipment, the hoisting and lowering assembly 2, the temporary hoisting assembly, and the suspension assembly and the steel cage 100 at different construction stages, and realizes the stable transfer of the center of gravity of the steel cage 100 section by section, so as to realize the accurate docking and stable lowering of each section of the steel cage 100. This method does not need to rely on large hoisting equipment to hoist the whole steel cage 100, effectively improving the stability and construction safety of the lowering operation. By adopting an intermittent connection method with the lifting lug 23 at the top of the steel cage 100, the risk of eccentric load and the swing amplitude during hoisting can be significantly reduced, effectively controlling the posture of the steel cage 100 and improving the hoisting accuracy and docking quality. In addition, this method supports the sectional transportation and on-site sectional assembly of the steel cage 100, with a small floor area, which can greatly reduce the overall transportation and hoisting difficulty. The used lowering device has a simple structure, is convenient to assemble and disassemble flexibly, can significantly improve the efficiency and safety of the construction of lowering the steel cage 100, and is especially suitable for working conditions with limited space or complex construction environments. At the same time, this lowering device can be reused, further reducing the construction cost and improving the economy.

[0089] It can be understood that different types of hoisting equipment can be selected according to actual needs, such as but not limited to crawler cranes, etc., and no specific limitation is made here.

[0090] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Steel cage lowering device, characterized in that, Comprising: Lowering frame (1), including a temporary supporting section (11), a guiding section (12) and a hoisting section (13), which are fixedly connected in sequence from bottom to top. The temporary supporting section (11) is arranged on the construction platform (7), and the cross-section of the guiding section (12) is in a C-shaped structure; Hoisting and lowering assembly (2), including a winch (21), a pulley hoisting member (22) and at least four lifting lugs (23). The winch (21) is relatively arranged on both sides of the temporary supporting section (11) on the construction platform (7). The pulley hoisting member (22) is symmetrically installed on the hoisting section (13) along the central axis in the length direction of the hoisting section (13). The lifting lugs (23) are fixedly arranged at intervals along the circumference of the top end of the steel reinforcement cage (100). The output end of the pulley hoisting member (22) is detachably connected to the lifting lugs (23) at intervals to form a staggered hoisting structure. The output end of the winch (21) is connected to the pulley hoisting member (22) to drive the pulley hoisting member (22) to drive the steel reinforcement cage (100) to be lowered along the guiding section (12) to the temporary supporting section (11); Temporary hoisting assembly, installed on the temporary supporting section (11) and capable of being detachably connected to the empty part of the top end of the steel reinforcement cage (100) except the lifting lugs (23); Suspension assembly, capable of being detachably connected to the top end of the steel reinforcement cage (100), and both ends thereof are abutted against the construction platform (7) for transferring and suspending the steel reinforcement cage (100) on the construction platform (7).

2. The reinforcement cage lowering device according to claim 1, wherein The hoisting and lowering assembly (2) further includes a reaction frame (24). One end of the reaction frame (24) is fixedly connected to the lowering frame (1), and the other end thereof is fixedly connected to the side of the winch (21) away from the lowering frame (1).

3. The steel cage lowering device according to claim 2, characterized in that The pulley hoisting member (22) includes a hoisting rope (221), a pulley block (222) and a plurality of first hooks (223). One end of the hoisting rope (221) is connected to the output end of the winch (21), and the other end thereof can be wound around the pulley block (222) and connected to the first hooks (223). The first hooks (223) are detachably connected to the lifting lugs (23), and the winch (21) can synchronously adjust the retraction and release of the plurality of first hooks (223).

4. The steel cage lowering device according to claim 3, characterized in that, The pulley hoisting member (22) further includes a top support roller (224). The top support roller (224) is fixedly arranged on the guiding section (12), and its roller end can support the hoisting rope (221) along the extending direction of the width of the lowering frame (1).

5. The steel cage lowering device according to claim 1, wherein, The temporary hoisting assembly includes a plurality of fixed hoisting members (3), and the plurality of fixed hoisting members (3) are fixedly arranged at the cross-section edge of the temporary supporting section (11) at the same horizontal height.

6. The steel reinforcement cage lowering device according to claim 5, characterized in that, The fixed hoisting member (3) includes a hoisting portion (31), a hoisting rope (32) and a second hook (33). The hoisting portion (31) is fixed to the edge of the cross-section of the temporary supporting section (11). The hoisting rope (32) surrounds the hoisting portion (31) and is connected to the second hook (33). The second hook (33) is detachably connected to the top of the steel reinforcement cage (100) leaving the lifting lug (23).

7. The steel reinforcement cage lowering device according to claim 1, wherein, The suspension assembly includes at least two crossbeam suspension members (4). At least two crossbeam suspension members (4) are arranged side by side at intervals along the radial extension direction of the steel reinforcement cage (100), and can all be anchored and connected to the top of the steel reinforcement cage (100). Both ends of the crossbeam suspension member (4) can abut against the construction platform (7).

8. The steel cage lowering device according to claim 7, wherein, The crossbeam suspension member (4) includes a crossbeam (41), a plurality of suspension bars (42) and a plurality of threaded sleeves (43). The crossbeam (41) is arranged along the radial direction of the steel reinforcement cage (100). The plurality of suspension bars (42) are arranged at intervals along the length direction of the crossbeam (41), and can penetrate through the crossbeam (41) and be anchored and connected to the top of the steel reinforcement cage (100). The end of the suspension bar (42) away from the steel reinforcement cage (100) is provided with an external thread. The threaded sleeve (43) is threadedly connected to the suspension bar (42) and abuts against the crossbeam (41).

9. The steel cage lowering device according to any one of claims 1-8, characterized in that, The steel reinforcement cage lowering device further includes an operation platform (5) and a ladder (6). The operation platform (5) is arranged at the height position of the connection between the hoisting section (13) and the guiding section (12). The ladder (6) is arranged along the length direction of the lowering frame (1). One end of the ladder (6) is connected to the operation platform (5), and the other end is connected to the construction platform (7).

10. Method for lowering steel reinforcement cage, characterized in that, Using the steel reinforcement cage lowering device according to any one of claims 1-9, comprising the following steps: S1: After the steel reinforcement cage (100) is processed in sections and transported to the construction site, at least four of the lifting lugs (23) are arranged at intervals along the circumference of the top of each section of the steel reinforcement cage (100); The hoisting equipment hoists the steel reinforcement cage (100) and places it into the lowering frame (1) through the notch position of the C-shaped structure of the guiding section (12). S2: The output end of the pulley hoisting member (22) is connected to the lifting lug (23) at the top of the steel reinforcement cage (100) at intervals, and the hoisting equipment is removed. S3: The winch (21) adjusts the pulley hoisting member (22) to lower the steel reinforcement cage (100) to the height position of the temporary supporting section (11). S4: The temporary hoisting assembly is connected to the lifting lug (23) left vacant at the top of the steel reinforcement cage (100), and the connection between the pulley hoisting member (22) and the lifting lug (23) is removed. S5: The hoisting equipment and the hoisting and lowering assembly (2) repeat steps S1 to S4 to hoist the next section of the steel reinforcement cage (100) and lower it to the butt joint position with the top of the previous section of the steel reinforcement cage (100), and complete the connection of the upper and lower sections of the steel reinforcement cage (100). S6: Remove the connection between the temporary hoisting assembly and the previous section of the steel reinforcement cage (100), and the hoisting and lowering assembly (2) continues to lower the integrally connected steel reinforcement cage (100) to the height position of the temporary support section (11), and repeat step S5 until all sections are connected and lowered; S7: After all sections are connected, the suspension assembly is fixedly connected to the top of the steel reinforcement cage (100), and the suspension assembly is carried on the construction platform (7), and remove the connection between the temporary hoisting assembly and the steel reinforcement cage (100); S8: The lowering frame (1) moves to the position of the next construction platform (7) to perform the lowering operation of the next group of steel reinforcement cages (100).

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