Box girder unhooking device and method

Abstract

The invention discloses a box girder unhooking device and method, and belongs to the technical field of bridge construction, the box girder unhooking device comprises a shelving unit, a bearing structure and an adjusting assembly, the shelving unit is fixedly connected to a to-be-installed box girder, and the shelving unit is provided with a connecting part protruding out of the to-be-installed box girder; the bearing structure is movably connected to the target box girder, and the connecting part can be placed on the bearing structure; the adjusting assembly comprises a vertical jacking piece and a horizontal adjusting piece, the vertical jacking piece is arranged on the bearing structure, the output end of the vertical jacking piece can be connected with the connecting part, and the vertical jacking piece is used for driving the box girder to be installed to move in the vertical direction; the horizontal adjusting piece is arranged on the target box girder, the output end of the horizontal adjusting piece is connected with the bearing structure, and the horizontal adjusting piece is used for driving the to-be-installed box girder to move in the horizontal direction through the bearing structure. According to the box girder unhooking method, the box girder unhooking device is adopted, separation of the hoisting process and the adjusting process is achieved, and the hoisting device can unhook and leave after completing initial hoisting of the to-be-installed box girder.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a box girder hook releasing device and method. Background Art

[0002] In the construction of large-span bridges, overpasses, rail transit bridges, and curved bridges, steel box girder components are typically transported to the construction site in sections, welded and joined at high altitude, and then the bridge deck is installed. This construction method offers the advantages of large spans, high assembly rates, and a high degree of factory integration, making it widely used in bridge construction.

[0003] During the conventional installation of steel box girders in sections, the problem of loosening the hook is inevitably encountered. Currently, the common construction method is to rely on lifting equipment to maintain the hoisted state of the steel box girder during the installation phase, while coordinating with temporary welding and adjusting with the help of jacks. After the adjustment is in place, welding and fixing are carried out. The specific operation process is to use lifting equipment to maintain the hoisting posture for a long time until the steel box girder section to be adjusted is adjusted and welded and fixed before loosening the hook. After completing the adjustment of one section, the construction machinery moves and then proceeds to the next section.

[0004] However, in areas with heavy traffic, large construction machinery such as lifting equipment occupying public roads for a long time will cause serious interference to surrounding traffic and affect the normal flow of traffic. In addition, in some local areas, due to limitations of factors such as site space, there may not be conditions for shutdown adjustments at all, resulting in obstruction of construction progress, and it may even be impossible to use this conventional method for construction. Summary of the Invention

[0005] The purpose of the present invention is to provide a box girder hook release device and method to solve the technical problems in the prior art of poor adaptability and susceptibility to environmental restrictions during the segmented installation of steel box girders.

[0006] As conceived above, the technical solution adopted by the present invention is:

[0007] In one aspect, the present invention provides a box girder hook release device, comprising:

[0008] A shelf unit is fixedly connected to the box beam to be installed, and the shelf unit has a connecting portion protruding from the box beam to be installed;

[0009] a bearing structure movably connected to the target box girder, wherein the connecting portion can be placed on the bearing structure;

[0010] The adjustment component includes a vertical jacking member and a horizontal adjustment member. The vertical jacking member is arranged on the bearing structure, and the output end of the vertical jacking member can be connected to the connecting part, so as to drive the box girder to be installed to move in the vertical direction; the horizontal adjustment member is arranged on the target box girder, and the output end of the horizontal adjustment member is connected to the bearing structure, so as to drive the box girder to be installed to move in the horizontal direction through the bearing structure.

[0011] Preferably, the box girder hook release device further includes a sliding plate, which is arranged between the bearing structure and the target box girder and is slidably connected to the target box girder.

[0012] Preferably, the horizontal adjustment member is a horizontal jack, the output end of the horizontal jack has a moving path extending in the horizontal direction, two horizontal jacks are provided, the two horizontal jacks are symmetrically arranged on both sides of the supporting structure, and the moving paths of the output ends of the two horizontal jacks are located on the same axis.

[0013] Preferably, the vertical lifting member is a vertical jack, the output end of the vertical jack has a moving path extending in the vertical direction, the connecting portion abuts against the output end of the vertical jack in the vertical direction, and there are two vertical jacks, which are arranged at intervals.

[0014] Preferably, four shelving units are provided, and the four shelving units are symmetrically arranged on both sides of the box beam to be installed, and the load-bearing structure and the adjustment component are provided corresponding to each of the shelving units on the target box beam.

[0015] Preferably, the shelving unit includes a horizontal plate and a vertical plate, the horizontal plate and the vertical plate are integrally formed and arranged in a T-shape, the vertical plate is placed on the bearing structure, and the horizontal plate is connected to the output end of the vertical lifting member.

[0016] Preferably, the box girder unhooking device further comprises a support seat, the support seat is fixedly connected to the target box girder, and the horizontal adjustment member is arranged on the support seat.

[0017] Preferably, the support seat includes a horizontal plate, a vertical plate and a reinforcement plate, the horizontal plate and the vertical plate are vertically arranged, the horizontal plate is connected to the target box beam, the vertical plate is connected to the horizontal adjustment member, and the reinforcement plate is arranged between the horizontal plate and the vertical plate.

[0018] On the other hand, the present invention also provides a box girder hook release method, which adopts the above-mentioned box girder hook release device, comprising:

[0019] S1. Fixing and connecting the shelf units on the box girder to be installed, and making part of the shelf units protrude from the box girder to be installed to form a connecting portion; arranging a bearing structure and an adjustment assembly on the target box girder, wherein the adjustment assembly includes a vertical jacking member and a horizontal adjustment member;

[0020] S2. Lift the box girder to be installed so that the connecting portion is placed on the bearing structure, and connect the output end of the vertical jacking member to the connecting portion;

[0021] S3, releasing the hoisting state of the box girder to be installed, and adjusting the position of the box girder to be installed relative to the target box girder by means of the vertical lifting member and the horizontal adjusting member;

[0022] S4. Weld the box girder to be installed with the target box girder.

[0023] Preferably, in S3, adjusting the position of the box girder to be installed relative to the target box girder by means of vertical jacking members and horizontal adjusting members includes: monitoring the position error between the box girder to be installed and the target box girder by means of a total station, and controlling the vertical jacking members and horizontal adjusting members to adjust the position of the box girder to be installed relative to the target box girder based on the position error; after the adjustment is completed, monitoring the position error between the box girder to be installed and the target box girder again, and if the position error meets the preset error range, the adjustment process is completed; otherwise, continuing to adjust the position of the box girder to be installed relative to the target box girder.

[0024] Beneficial effects of the present invention:

[0025] The box girder unhooking device proposed in the present invention, when in use, first fixes and connects the mounting unit to the box girder to be installed, with a portion of the mounting unit protruding from the box girder to form a connecting portion. Simultaneously, a load-bearing structure and an adjustment assembly are installed on the target box girder. Next, the box girder to be installed is hoisted, with the connecting portion resting on the load-bearing structure, and the output end of the vertical lifting member is connected to the connecting portion. The hoisted box girder to be installed is then released, and the position of the box girder to be installed relative to the target box girder is adjusted using the vertical lifting member and horizontal adjustment member. Finally, the box girder to be installed and the target box girder are welded together.

[0026] The shelving unit, fixedly connected to the target box girder and featuring a protruding connection, quickly forms a stable temporary support point during the initial lifting phase. This connection allows the box girder to maintain a stable position even after being released from the lifting device's hook, eliminating the need for the lifting device to maintain a suspended position for extended periods. The docking design of the vertical lifting member and the connection allows the weight of the target box girder to be quickly transferred from the lifting device's hook to the vertical lifting member, facilitating subsequent unhooking of the lifting device. The support structure is flexibly connected to the fixed target box girder, allowing for subsequent positional adjustments between the target box girder and the target girder. In the adjustment assembly, the vertical lifting member directly acts on the connection, raising or lowering the target box girder to control its vertical displacement. The horizontal adjustment member drives the support structure to slide along the contact surface of the target box girder, adjusting the horizontal position of the entire target box girder. The combined vertical and horizontal adjustment of the adjustment assembly allows operators to adapt the overall position of the target box girder to actual on-site working conditions. After the position adjustment of the box girder to be installed is completed, the vertical jacking parts can continue to provide vertical support force until the box girder to be installed is welded and fixed to the target box girder. In summary, the box girder unhooking device realizes the separation of the lifting and adjustment processes, so that the lifting device can be evacuated after completing the initial lifting and lowering, significantly shortening its road occupation time. At the same time, the adjustment component makes it possible to adjust the position of the box girder to be installed even in a narrow space, providing autonomous operation conditions without space restrictions for subsequent adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view of the assembly of the box girder to be installed and the target box girder provided in the first embodiment of the present invention;

[0028] Figure 2 1 is a top view of the assembly of the box girder to be installed and the target box girder provided in the first embodiment of the present invention;

[0029] Figure 3 This is a front view of the box girder hook release device provided in the first embodiment of the present invention;

[0030] Figure 4 It is a top view of the box girder hook releasing device provided in the first embodiment of the present invention.

[0031] In the picture:

[0032] 100. Box girder to be installed; 200. Target box girder; 1. Shelving unit; 10. Connecting part; 11. Horizontal plate; 12. Vertical plate; 2. Load-bearing structure; 3. Adjustment assembly; 31. Vertical lifting member; 32. Horizontal adjustment member; 4. Sliding plate; 5. Support seat; 51. Horizontal plate; 52. Vertical plate; 53. Reinforcement plate. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] Example 1

[0038] An embodiment of the present invention provides a box girder hook releasing device, which can quickly release the hook of a target box girder 200 after a lifting device lifts the box girder 100 to be installed to the target box girder 200.

[0039] See also Figures 1 to 4The box girder unhooking device provided by the embodiment of the present invention includes a shelf unit 1, a bearing structure 2 and an adjustment component 3. Among them, the shelf unit 1 is fixedly connected to the box girder 100 to be installed, and the shelf unit 1 has a connecting portion 10 protruding from the box girder 100 to be installed; the bearing structure 2 is movably connected to the target box girder 200, and the connecting portion 10 can be placed on the bearing structure 2; the adjustment component 3 includes a vertical jacking member 31 and a horizontal adjustment member 32. The vertical jacking member 31 is provided on the bearing structure 2, and the output end of the vertical jacking member 31 can be connected to the connecting portion 10 to drive the box girder 100 to be installed to move in the vertical direction; the horizontal adjustment member 32 is provided on the target box girder 200, and the output end of the horizontal adjustment member 32 is connected to the bearing structure 2 to drive the box girder 100 to be installed to move in the horizontal direction through the bearing structure 2.

[0040] When using the box girder unhooking device proposed in the present invention, first, the shelf unit 1 is fixedly connected to the box girder 100 to be installed, and a portion of the shelf unit 1 is protruded from the box girder 100 to form a connecting portion 10; at the same time, a bearing structure 2 and an adjustment assembly 3 are arranged on the target box girder 200. Next, the box girder 100 to be installed is hoisted, so that the connecting portion 10 is placed on the bearing structure 2, and the output end of the vertical jacking member 31 is connected to the connecting portion 10; then, the hoisting state of the box girder 100 to be installed is released, and the position of the box girder 100 to be installed relative to the target box girder 200 is adjusted by the vertical jacking member 31 and the horizontal adjustment member 32; finally, the box girder 100 to be installed and the target box girder 200 are welded.

[0041] The shelving unit 1 is fixedly connected to the box girder 100 to be installed and has a connecting portion 10 protruding from the box girder 100 to be installed. It can quickly form a stable temporary support point in the initial stage of lifting, so that the box girder 100 to be installed can still maintain a stable posture through the cooperation of the connecting portion 10 and the bearing structure 2 after being separated from the hook of the lifting device, without relying on the lifting device to maintain a hovering state for a long time. The docking design of the vertical jacking member 31 and the connecting portion 10 allows the gravity of the box girder 100 to be installed to be quickly transferred from the hook of the lifting device to the vertical jacking member 31, creating basic conditions for the subsequent unhooking of the lifting device. The bearing structure 2 is movably connected to the fixed target box girder 200, reserving freedom for the subsequent position adjustment between the box girder 100 to be installed and the target box girder 200. In the adjustment assembly 3, the vertical jacking member 31 acts directly on the connection portion 10, controlling the vertical displacement of the box girder 100 to be installed by lifting or lowering it; the horizontal adjustment member 32 drives the supporting structure 2 to slide along the contact surface of the target box girder 200, thereby driving the entire box girder 100 to be installed to adjust its horizontal position. The adjustment assembly 3 combines vertical and horizontal adjustment actions, allowing the operator to adaptively adjust the overall position of the box girder 100 to be installed according to the actual working conditions on site. After the position adjustment of the box girder 100 to be installed is completed, the vertical jacking member 31 can continue to provide vertical support force until the box girder 100 to be installed is welded and fixed to the target box girder 200. In summary, the box girder unhooking device realizes the separation of the lifting and adjustment processes, allowing the lifting device to be evacuated after completing the initial lifting and lowering, significantly shortening its road occupation time. At the same time, the adjustment assembly 3 makes it possible to achieve the position adjustment process of the box girder 100 to be installed even in a narrow space, providing autonomous operating conditions for subsequent adjustments without space restrictions.

[0042] The specific structure of the box girder hook release device is described below.

[0043] In this embodiment, the lifting device is a crane, which is connected to the box girder 100 to be installed via a hook to achieve the lifting operation of the box girder 100 to be installed. In other feasible embodiments, different types of lifting equipment such as tower cranes, gantry cranes, or floating cranes can be substituted according to the site conditions. The specific mechanical structure and lifting operation mechanism of these alternative equipment are conventional technical means in the field and will not be described in detail here.

[0044] The shelving unit 1 includes a horizontal plate 11 and a vertical plate 12. The horizontal plate 11 and the vertical plate 12 are integrally formed and arranged in a T-shape. The vertical plate 12 is placed on the supporting structure 2, and the horizontal plate 11 is connected to the output end of the vertical jacking member 31. The structural characteristics of the T-shaped layout enable the shelving unit 1 to have bending resistance in the vertical direction, while retaining sufficient shear strength in the horizontal direction. When the height of the box girder 100 to be installed is adjusted, the torque generated by the vertical jacking member 31 acting on the horizontal plate 11 can form a self-balance through the contact point between the vertical plate 12 and the supporting structure 2, preventing the device from tilting due to unilateral force. In addition, the horizontal extension of the horizontal plate 11 provides sufficient installation and positioning space for the vertical jacking member 31, so that the output end of the vertical jacking member 31 can be quickly and accurately aligned with the shelving unit 1, shortening the equipment docking time after hoisting.

[0045] For example, four shelving units 1 are provided, symmetrically arranged on either side of the box girder 100 to be installed. A load-bearing structure 2 and an adjustment assembly 3 are provided for each shelving unit 1 on the target box girder 200. The four symmetrically arranged shelving units 1 ensure a more even force distribution on the box girder 100 to be installed during adjustment, preventing undesirable conditions such as tilting and twisting of the box girder 100 to be installed due to uneven force distribution, thereby improving the stability of the box girder 100 to be installed during adjustment. Furthermore, multiple adjustment points enable more precise and all-around adjustment of the box girder position, enabling more accurate fine-tuning both horizontally and vertically, effectively improving the accuracy of the installation position of the box girder 100 to be installed.

[0046] In other embodiments, the number of the shelving units 1 may be two, six, or eight according to actual needs, and the location and number of the shelving units 1 are not limited herein.

[0047] The vertical lifting member 31 is connected to the connecting portion 10 of the shelf unit 1 through its output end, and is used to support the box beam 100 to be installed, and can also drive the box beam 100 to be installed to move in the vertical direction.

[0048] Specifically, the vertical jacking member 31 is a vertical jack. The output end of the vertical jack has a movement path extending in the vertical direction. The connecting portion 10 abuts the output end of the vertical jack in the vertical direction. Two vertical jacks are provided, and the two vertical jacks are arranged at intervals. The provision of two vertical jacks at intervals can, on the one hand, increase the lifting force, making it easier to carry and move the heavier box girder 100 to be installed, thereby improving the load-bearing capacity of the device. On the other hand, the two jacks arranged at intervals can ensure that the box girder 100 to be installed is subjected to more uniform vertical force, avoiding local stress concentration or tilting of the box girder due to single-point jacking.

[0049] The output end of the horizontal adjustment member 32 is connected to the bearing structure 2 , and drives the bearing structure 2 to move, thereby driving the box beam 100 to be installed to move synchronously, thereby adjusting the horizontal position of the box beam 100 to be installed.

[0050] Specifically, the horizontal adjustment member 32 utilizes a horizontal jack, the output end of which has a horizontally extending movement path. Two horizontal jacks are provided, symmetrically positioned on either side of the load-bearing structure 2, with the movement paths of their output ends co-axially located. The provision of two horizontal jacks symmetrically positioned on either side of the load-bearing structure 2, with their output end movement paths co-axially located, allows for balanced force application from both sides of the load-bearing structure 2, preventing twisting or offsetting of the load-bearing structure 2 during the horizontal adjustment process and ensuring stability when driving the box girder 100 to be installed for horizontal movement.

[0051] Preferably, the box girder unhooking device further comprises a support base 5, the support base 5 being fixedly connected to the target box girder 200, and the horizontal adjustment member 32 being disposed on the support base 5. The support base 5 being fixedly connected to the target box girder 200 provides a stable mounting base for the horizontal adjustment member 32, thereby enhancing the stability of the horizontal adjustment member 32 during operation.

[0052] Specifically, the support seat 5 includes a horizontal plate 51, a vertical plate 52 and a reinforcing plate 53. The horizontal plate 51 and the vertical plate 52 are arranged vertically. The horizontal plate 51 is connected to the target box beam 200, and the vertical plate 52 is connected to the horizontal adjustment member 32. The reinforcing plate 53 is arranged between the horizontal plate 51 and the vertical plate 52. The horizontal plate 51 is connected to the target box beam 200, providing a stable connection foundation for the entire support seat 5 to the target box beam 200. The vertical plate 52 is connected to the horizontal adjustment member 32, making the position of the horizontal adjustment member 32 more stable when working, and is used to bear the reaction force applied by the box beam 100 to be installed to the horizontal adjustment member 32 when the horizontal adjustment member 32 pushes the box beam 100 to be installed, thereby ensuring the stability of the horizontal adjustment force. The reinforcing plate 53 arranged between the horizontal plate 51 and the vertical plate 52 enhances the strength and stability of the connection portion 10 between the horizontal plate 51 and the vertical plate 52, and effectively disperses the stress generated when the horizontal adjustment member 32 is working.

[0053] Since the box girder 100 to be installed is relatively heavy, in order to prevent the box girder 100 to be installed from exerting too much pressure on the bearing structure 2, resulting in excessive friction between the contact surface of the bearing structure 2 and the target box girder 200, so that the bearing structure 2 cannot effectively move on the contact surface of the target box girder 200. The box girder unhooking device also includes a sliding plate 4, which is arranged between the bearing structure 2 and the target box girder 200 and is slidably connected to the target box girder 200. The sliding plate 4 provides a smooth sliding track for the bearing structure 2, so that the horizontal adjustment member 32 drives the bearing structure 2 and then drives the box girder 100 to be installed to move horizontally more smoothly, reduces the friction obstruction during the movement, and improves the efficiency and flexibility of the horizontal adjustment.

[0054] The sliding plate 4 can be a roller skateboard, a polytetrafluoroethylene plate or a steel plate and lubricant can be applied on the surface of the steel plate. The specific form is not limited here, as long as it can achieve the above effect.

[0055] Example 2

[0056] The embodiment of the present invention further provides a box girder hook release method, which uses the box girder hook release device provided in the first embodiment. For simplicity, the components in the second embodiment that are the same as or corresponding to the first embodiment are marked with the same reference numerals as those in the first embodiment. The box girder hook release method includes:

[0057] S1. Fix the shelving unit 1 on the box beam 100 to be installed, and make part of the shelving unit 1 protrude from the box beam 100 to be installed to form a connecting portion 10; set a bearing structure 2 and an adjustment component 3 on the target box beam 200, wherein the adjustment component 3 includes a vertical jacking member 31 and a horizontal adjustment member 32.

[0058] In this step, specifically, half of the shelf units 1 are firmly fixed to the upper flanges of the corresponding webs of the box beam 100 to be installed by welding. Before the box beam 100 to be installed, it is necessary to measure and verify the installed target box beam 200.

[0059] After the measurement operation is completed, the measurement results are carefully reviewed, and corresponding fine-tuning work is carried out on the box girder 100 to be installed based on the review results to ensure its installation accuracy.

[0060] Before installation begins, the upper flange of the box girder 100, where the shelving units 1 are already installed, is cleaned to prepare for subsequent operations. Positions for the horizontal jacks and sliding plates 4 in the horizontal adjustment member 32 are reserved, and markings are set at the corresponding locations. These markings serve as a reference for subsequent installation, facilitating accurate installation of the horizontal adjustment member 32 and sliding plates 4 and ensuring the correct positioning of all components of the box girder unhooking device. Afterwards, the support base 5 is welded to the top of the target box girder 200, and the horizontal adjustment member 32 is installed.

[0061] S2. Lift the box girder 100 to be installed, place the connecting portion 10 on the bearing structure 2, and connect the output end of the vertical lifting member 31 to the connecting portion 10;

[0062] In this step, the lifting slings are properly installed according to the lifting weight and the performance of the lifting device used to ensure that the lifting slings can safely and stably bear the weight of the box beam 100 to be installed.

[0063] After the installation of the lifting rigging is completed, slowly lift the hook. During this process, closely observe the posture of the box girder 100 to be installed to ensure that the box girder 100 to be installed remains stable during the lifting process without abnormal conditions such as tilting and shaking.

[0064] After confirming that the posture of the box girder 100 to be installed is normal, operate the main arm of the lifting device to rotate, and turn the box girder 100 to be installed above the installation position of the target box girder 200, and then slowly lower the hook to make the box girder 100 to be installed gradually approach the target box girder 200.

[0065] When the box girder 100 to be installed is placed at the installation point, the shelf unit 1 is protruding from the connection part 10 of the box girder 100 to be installed and is placed on the bearing structure 2 on the target box girder 200, and the output end of the vertical jacking member 31 is connected to the connection part 10, while ensuring that the horizontal adjustment member 32 and the bearing structure 2 are in an active state.

[0066] After confirming that the box girder unhooking device has been installed and all components are securely connected, activate the adjustment assembly 3. The jacks of the vertical jacking member 31 and the horizontal adjustment member 32 apply force to tighten the corresponding connecting parts 10 and the supporting structure 2 to ensure the position stability of the box girder 100 to be installed during the unhooking process.

[0067] After the vertical lifting member 31 and the horizontal adjusting member 32 are stabilized respectively, slowly lower the hook and continue to observe the stress condition of the sling until the sling is completely free of stress. At this time, the weight of the box girder 100 to be installed is completely borne by the bearing structure 2 and the adjusting assembly 3, completing the transition from lifting to loosening the hook.

[0068] S3, releasing the hoisting state of the box girder 100 to be installed, and adjusting the position of the box girder 100 to be installed relative to the target box girder 200 by means of the vertical jacking member 31 and the horizontal adjustment member 32;

[0069] During this step, the lifting rigging is continuously monitored for 30 minutes, closely monitoring the box girder 100 for signs of shaking, deflection, or other abnormalities. If the box girder 100 remains stable and exhibits no abnormalities during this monitoring period, the hook can be deployed to complete the lifting operation. However, if any abnormalities occur, such as significant tilt or local deformation of the box girder, the lifting operation must be terminated immediately to investigate and address the abnormality to ensure safety and installation accuracy.

[0070] Afterwards, the position error between the box girder 100 to be installed and the target box girder 200 is monitored by the total station, and the vertical jacking member 31 and the horizontal adjustment member 32 are controlled to adjust the position of the box girder 100 to be installed relative to the target box girder 200 based on the position error; after the adjustment is completed, the position error between the box girder 100 to be installed and the target box girder 200 is monitored again. If the position error meets the preset error range, the adjustment process is completed; otherwise, the position of the box girder 100 to be installed relative to the target box girder 200 is continued to be adjusted until the position error meets the preset error range, which indicates that the position between the box girder 100 to be installed and the target box girder 200 has been adjusted.

[0071] S4. Welding the box girder 100 to be installed and the target box girder 200.

[0072] Specifically, after confirming that the position adjustment of the box beam 100 to be installed relative to the target box beam 200 is completed and the position error is within the preset error range, the welding operation is started.

[0073] First, clean the welded areas of the target box girder 100 and the target box girder 200 to remove surface oil, rust, dust, and other impurities to ensure weld quality. Use professional cleaning tools such as wire brushes, sandpaper, and detergent to carefully clean the weld area to ensure a clean and smooth surface.

[0074] Next, appropriate welding materials and equipment are selected based on the material, thickness, and welding process requirements of the box girder 100 to be installed and the target box girder 200. For example, for common steel box girders, low-alloy steel electrodes may be used, along with manual arc welding equipment or gas shielded welding equipment. Furthermore, the welding equipment must be in good operating condition and parameters such as current, voltage, and welding speed must be adjusted to meet the specific requirements of the welding job.

[0075] After preparations are complete, professional welding operators are assigned to perform welding operations according to established welding procedure specifications. During the welding process, operators must strictly control the welding speed, welding angle, and welding sequence to reduce welding stress and deformation. Generally, segmented welding and symmetrical welding methods are used, welding from one end of the box girder to the other, welding the main stress-bearing areas first, and then completing welding other areas. For example, a root weld is first performed at the connection between the web and flange of the box girder to ensure good fusion at the root of the weld. Then, filler welds and cap welds are performed to ensure that the weld meets the specified size and shape requirements.

[0076] During the welding process, dedicated personnel are required to monitor the welding quality in real time. Visual inspections are performed to observe the weld surface for defects such as pores, slag inclusions, cracks, and lack of fusion. For welds in critical areas, non-destructive testing equipment, such as ultrasonic flaw detectors and radiographic flaw detectors, may be required to inspect the internal quality of the weld to ensure it meets relevant standards and design requirements.

[0077] If quality problems are found during the welding process, such as pores, welding must be stopped immediately, the pores must be polished and cleaned, and welding must be repeated. If serious defects such as cracks are found, the defective parts must be thoroughly removed, and a special repair plan must be developed before rework welding can be performed.

[0078] After welding is complete, the weld undergoes necessary post-processing. This includes cleaning slag and spatter from the weld surface and polishing the weld to ensure a smooth, flat surface and a natural transition with the surrounding base metal. Furthermore, the weld area undergoes appropriate heat treatment to eliminate residual stress and improve the performance of the weld joint. Finally, a comprehensive weld quality inspection is conducted to ensure that the weld quality meets the requirements. This completes the welding of the pre-installed box girder 100 and the target box girder 200.

[0079] After the welding of the box girder 100 to be installed and the target box girder 200 is completed and the welding quality inspection is passed, the sliding plate 4, the adjustment assembly 3, the bearing structure 2 and the shelving unit 1 are removed in sequence.

[0080] After that, repeat S1-S5 until the entire span of steel box girder sections are all installed and moved to the next span hoisting operation point for construction.

[0081] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A box girder hook release device, characterized in that: include: A shelf unit (1) is fixedly connected to a box beam (100) to be installed, and the shelf unit (1) has a connecting portion (10) protruding from the box beam (100) to be installed; A bearing structure (2) is movably connected to the target box beam (200), and the connecting portion (10) can be placed on the bearing structure (2); An adjustment assembly (3) comprises a vertical jacking member (31) and a horizontal adjustment member (32), wherein the vertical jacking member (31) is arranged on the bearing structure (2), and the output end of the vertical jacking member (31) can be connected to the connecting portion (10) for driving the box girder (100) to be installed to move in the vertical direction; and the horizontal adjustment member (32) is arranged on the target box girder (200), and the output end of the horizontal adjustment member (32) is connected to the bearing structure (2) for driving the box girder (100) to be installed to move in the horizontal direction through the bearing structure (2).

2. The box girder hook release device according to claim 1, characterized in that: The box beam unhooking device further comprises a sliding plate (4), wherein the sliding plate (4) is arranged between the bearing structure (2) and the target box beam (200) and is slidably connected to the target box beam (200).

3. The box girder hook release device according to claim 1, characterized in that: The horizontal adjustment member (32) is a horizontal jack, and the output end of the horizontal jack has a moving path extending in the horizontal direction. There are two horizontal jacks, and the two horizontal jacks are symmetrically arranged on both sides of the bearing structure (2). The moving paths of the output ends of the two horizontal jacks are located on the same axis.

4. The box girder hook release device according to claim 1, characterized in that: The vertical lifting member (31) is a vertical jack, the output end of the vertical jack has a moving path extending in the vertical direction, the connecting portion (10) abuts against the output end of the vertical jack in the vertical direction, and two vertical jacks are provided, and the two vertical jacks are arranged at intervals.

5. The box girder hook releasing device according to claim 1, characterized in that: Four shelving units (1) are provided, and the four shelving units (1) are symmetrically arranged on both sides of the box beam (100) to be installed, and the target box beam (200) is provided with the bearing structure (2) and the adjustment component (3) corresponding to each of the shelving units (1).

6. The box girder hook releasing device according to claim 1, characterized in that: The shelving unit (1) comprises a horizontal plate (11) and a vertical plate (12); the horizontal plate (11) and the vertical plate (12) are integrally formed and arranged in a T-shape; the vertical plate (12) is shelved on the bearing structure (2); and the horizontal plate (11) is connected to the output end of the vertical lifting member (31).

7. The box girder hook releasing device according to claim 1, characterized in that: The box beam hook release device further comprises a support seat (5), the support seat (5) is fixedly connected to the target box beam (200), and the horizontal adjustment member (32) is arranged on the support seat (5).

8. The box girder hook releasing device according to claim 7, characterized in that: The support seat (5) includes a transverse plate (51), a vertical plate (52) and a reinforcing plate (53), wherein the transverse plate (51) and the vertical plate (52) are vertically arranged, the transverse plate (51) is connected to the target box beam (200), the vertical plate (52) is connected to the horizontal adjustment member (32), and the reinforcing plate (53) is arranged between the transverse plate (51) and the vertical plate (52).

9. A box girder hook loosening method, characterized in that: The box girder hook releasing device according to any one of claims 1 to 8 comprises: S1. Fixing and connecting a shelf unit (1) on a box beam (100) to be installed, and making a portion of the shelf unit (1) protrude from the box beam (100) to be installed to form a connecting portion (10); arranging a bearing structure (2) and an adjustment assembly (3) on a target box beam (200), wherein the adjustment assembly (3) includes a vertical lifting member (31) and a horizontal adjustment member (32); S2, lifting the box beam (100) to be installed, placing the connecting portion (10) on the bearing structure (2), and connecting the output end of the vertical jacking member (31) to the connecting portion (10); S3, releasing the hoisting state of the box girder (100) to be installed, and adjusting the position of the box girder (100) to be installed relative to the target box girder (200) by means of the vertical jacking member (31) and the horizontal adjustment member (32); S4. Welding the box girder to be installed (100) and the target box girder (200).

10. The box girder hook loosening method according to claim 9, characterized in that: In S3, adjusting the position of the box beam to be installed (100) relative to the target box beam (200) by means of the vertical jacking member (31) and the horizontal adjusting member (32) includes: The position error between the box girder to be installed (100) and the target box girder (200) is monitored by a total station, and the vertical jacking member (31) and the horizontal adjustment member (32) are controlled based on the position error to adjust the position of the box girder to be installed (100) relative to the target box girder (200); after the adjustment is completed, the position error between the box girder to be installed (100) and the target box girder (200) is monitored again; if the position error meets the preset error range, the adjustment process is completed; otherwise, the position of the box girder to be installed (100) relative to the target box girder (200) is continued to be adjusted.

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