A steel box girder hoisting device for bridge

Abstract

The application provides a steel box girder hoisting device for a bridge, and relates to the technical field of bridge construction equipment, comprising two hoisting devices for connecting two ends of the steel box girder; the hoisting device comprises a support truss, a first telescopic part, a winch structure and a balancing part, the first telescopic part is used to drive the winch structure to move back and forth on the top of the support truss; the balancing part is connected with the steel box girder to form multiple lifting points, which are used to adjust the balance degree of the steel box girder; the winch structure is connected with the balancing part through a steel wire rope, which is used to wind and unwind the steel wire rope to lift the steel box girder; a guide rod is movably connected between the winch structure and the balancing part, which is used to guide the lifting of the steel box girder. In the process of hoisting the steel box girder, the application can avoid the rotation and swing of the steel box girder, avoid the impact on the connection position of the hoisting device or the steel box girder, and further avoid causing safety accidents, thereby improving the safety of the entire hoisting work.

Description

Technical Field

[0001] This invention relates to the field of bridge construction equipment technology, and more specifically, to a steel box girder hoisting device for bridges. Background Technology

[0002] Bridges generally refer to structures erected over rivers, lakes, and seas to enable vehicles and pedestrians to pass smoothly. Steel box girders are the main load-bearing components in bridge engineering. Steel box girders, also known as steel plate box girders, are mainly composed of a top plate, bottom plate, web plate, and transverse and longitudinal diaphragms, all constructed through a fully welded process. The top plate often adopts an orthogonal irregular bridge deck design with longitudinal stiffening ribs, which has the characteristics of strong bending and torsional resistance. It is the most commonly used structural form for long-span bridges, urban elevated roads, and interchanges. For example, steel box girders are widely used in the stiffening girders of suspension bridges and cable-stayed bridges.

[0003] During the construction of large bridges spanning waterways, steel box girder segments are mostly transported to the bridge site by ships, and then lifted, aligned, and assembled by bridge deck hoisting equipment. Existing steel box girder hoisting equipment uses only one rope (or multiple ropes in one place, which are equivalent to a thickened rope) for connection at the final suspension position. For example, a steel box girder hoisting and installation device and method disclosed in Chinese Patent Publication No. CN122254408A uses a steel wire rope on the electric hoist for suspension connection between the electric hoist and the control box. Another example is a steel box girder construction hoisting device disclosed in Chinese Patent Publication No. CN122254380A, which uses a crane connected to the device through a lifting ring. That is, the crane uses a hook connected to the lifting ring through a steel wire rope for suspension. The hoisting of steel box girders in the above cases all ultimately use only one rope (or multiple ropes in one place, which are equivalent to a thickened rope). In this way, the steel box girder is prone to rotation and swaying during hoisting (such as in windy weather), which may lead to collisions with the hoisting equipment or the connection point of the steel box girder, and may cause safety accidents. Summary of the Invention

[0004] The present invention aims to solve the problem that when existing hoisting equipment uses a single rope during hoisting, the steel box girder is prone to rotation and swaying, which may lead to collisions with the hoisting equipment or the connection point of the steel box girder, and thus easily cause safety accidents.

[0005] To address the aforementioned problems, this invention provides a steel box girder hoisting device for bridges, comprising two hoisting devices, each used to connect both ends of the steel box girder; The hoisting device includes a support truss, a first telescopic component, a winch structure, and a balancing component. The first telescopic component is used to drive the winch structure to move back and forth on the top of the support truss. The balancing component is connected to the steel box girder to form multiple lifting points, which are used to adjust the balance of the steel box girder; The hoisting structure is connected to the balance component via a wire rope, and is used to raise and lower the steel box girder by winding and unwinding the wire rope. A guide rod is movably connected between the hoisting structure and the balancing component to guide the steel box girder during lifting and lowering.

[0006] The steel box girder hoisting equipment for bridges provided by this invention has, but is not limited to, the following beneficial effects compared to the prior art: The bridge uses steel box girder hoisting equipment. Two hoisting devices are used at the hoisting positions on the bridge, each connected to one end of the steel box girder. This helps to initially prevent the steel box girder from rotating or swaying during hoisting. For each hoisting device, a supporting truss is used at the hoisting position on the bridge for stability. At the corresponding ends of the steel box girder, a balancer is used to connect to the girder, forming multiple lifting points. This distributes the concentrated lifting force into multiple lifting points, ensuring the steel box girder is lifted horizontally and preventing excessive local stress on the top plate from causing deformation. A winch structure is used at the top of the supporting truss, connected to the balancer via steel wire ropes. The winches in both hoisting devices simultaneously wind up the steel wire ropes, pulling the two ends of the steel box girder and hoisting them simultaneously. The balancer connects to the steel box girder to form multiple lifting points. By fine-tuning the tightness of each lifting point, the overall balance of the steel box girder is adjusted, ensuring it remains balanced during suspension and preventing tilting that could cause rotation or swaying. Simultaneously, a guide rod is connected between the hoisting structure and the balancer. This guide rod, positioned next to the corresponding wire rope, guides the steel box girder during lifting, further preventing rotation and swaying during hoisting. This avoids collisions with hoisting equipment or the connection points between the steel box girder and the hoisting equipment, thus preventing safety accidents and improving the overall safety of the hoisting operation. After vertical movement is completed, the hoisting structure stops working, and the first telescopic component drives the hoisting structure to move backward at the top of the supporting truss, ultimately completing the hoisting and splicing of the steel box girder.

[0007] Furthermore, the hoisting structure includes a frame movably mounted on the top of the supporting truss. A motor, a reducer, and two bearing seats are mounted on the top of the frame. A drum is rotatably mounted on the two bearing seats. The output shaft of the motor is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to the drum. One end of the wire rope is wound around the drum, and the other end is connected to the balancing component.

[0008] Furthermore, the other end of the wire rope is connected to the balancing component via a pulley system. The pulley system includes a wheel frame one fixed to the bottom of the frame and a wheel frame two fixed to the top of the balancing component. A fixed pulley is rotatably mounted on the wheel frame one, and a movable pulley is rotatably mounted on the wheel frame two. The other end of the wire rope passes counterclockwise around the bottom of the movable pulley, the top of the fixed pulley, and is fixed to the top of the wheel frame two.

[0009] Furthermore, one end of the first telescopic member is connected to the support truss, and the other end is connected to the frame. Wheel rails are installed on both the top left and right sides of the support truss, and a track wheel that cooperates with the wheel rails is rotatably installed at the bottom of the frame.

[0010] Furthermore, a guide sleeve is fixedly connected to the front side of the frame, the bottom end of the guide rod is fixed to the balance component, and a guide through hole is provided on the guide sleeve to cooperate with the movement of the guide rod.

[0011] Furthermore, the balancing component includes a balancing beam, with electric hoists installed at both ends of the balancing beam. The hooks of the electric hoists hook onto prefabricated lifting lugs on the top surface of the steel box girder to form lifting points.

[0012] Furthermore, a counterweight base frame is slidably provided at the bottom of the support truss along the front-to-back direction, and second telescopic members that can be adjusted vertically are symmetrically provided on the left and right sides of the support truss.

[0013] Furthermore, the connecting beam of the counterweight base frame is provided with several bolt through holes for anchoring with high-strength bolts to the steel box girder.

[0014] Furthermore, the bottom left and right sides of the support truss are fixedly connected to support slides, the support slides slide in sliding cooperation with the beam rail of the counterweight base frame, and steel balls are rotatably installed on the upper and lower sides inside the support slides.

[0015] Furthermore, limit blocks are fixedly connected to both sides of the support slide, and limit pins are inserted and removed between the limit blocks and the beam rail of the counterweight base frame. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the steel box girder hoisting equipment for bridges according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the hoisting structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the pulley system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the connection structure between the support truss and the counterweight base frame according to an embodiment of the present invention; Figure 5 Embodiments of the present invention Figure 4 Rear view.

[0017] Explanation of reference numerals in the attached figures: 1. Support truss; 101. Wheel and rail; 2. First telescopic component; 3. Guide rod; 4. Hoisting structure; 401. Frame; 402. Motor; 403. Reducer; 404. Track wheel; 405. Drum; 406. Bearing seat; 407. Pulley block; 4071. Wheel frame one; 4072. Fixed pulley; 4073. Guide pulley; 4074. Wheel frame two; 4075. Movable pulley; 408. Guide sleeve; 4081. Guide through hole; 5. Wire rope; 6. Balancing component; 601. Balancing beam; 602. Electric hoist; 7. Counterweight base frame; 701. Beam rail; 702. Connecting beam; 8. Second telescopic component; 9. Bolt through hole; 10. Support slide; 11. Steel ball; 12. Limiting block; 13. Limiting pin. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application are described clearly and completely below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," "comprise," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms, indicating that a method comprises one or more steps, or an apparatus comprises one or more elements, but do not exclude the inclusion of other steps or elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or primary / secondary relationship. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, in the attached diagram, the X-axis represents the vertical direction, that is, the front-to-back position, and the positive direction of the X-axis (that is, the direction the arrow points to) represents the front, and the negative direction of the X-axis (that is, the direction opposite to the positive direction of the X-axis) represents the back; in the attached diagram, the Y-axis represents the horizontal direction, that is, the left-to-right position, and the positive direction of the Y-axis (that is, the direction the arrow points to) represents the left, and the negative direction of the Y-axis (that is, the direction opposite to the positive direction of the Y-axis) represents the right; in the attached diagram, the Z-axis represents the vertical direction, that is, the up-to-down position, and the positive direction of the Z-axis (that is, the direction the arrow points to) represents the up, and the negative direction of the Z-axis (that is, the direction opposite to the positive direction of the Z-axis) represents the down.

[0022] It should also be noted that the aforementioned X-axis, Y-axis and Z-axis are only for the purpose of facilitating the description of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] See Figure 1 The present invention provides a steel box girder hoisting device for bridges, comprising two hoisting devices, which are respectively used to connect the two ends of the steel box girder; The hoisting device includes a support truss 1, a first telescopic member 2, a hoisting structure 4, and a balancing member 6. The first telescopic member 2 is used to drive the hoisting structure 4 to move back and forth on the top of the support truss 1. The balance component 6 is connected to the steel box girder to form multiple lifting points, which are used to adjust the balance of the steel box girder; The hoisting structure 4 is connected to the balance component 6 via a wire rope 5, and is used to raise and lower the steel box girder by winding and unwinding the wire rope 5. A guide rod 3 is movably connected between the hoisting structure 4 and the balancing component 6, which is used to guide the steel box girder during lifting and lowering.

[0026] In this embodiment, the bridge steel box girder hoisting equipment uses two hoisting devices at the hoisting position on the bridge (i.e., the steel box girder that has been hoisted and spliced). These devices are connected to both ends of the steel box girder to initially prevent the steel box girder from rotating or swaying during hoisting. When each hoisting device is used, a support truss 1 is used for stable support at the hoisting position on the bridge (i.e., the steel box girder that has been hoisted and spliced). At the corresponding ends of the steel box girder, a balancer 6 is used to connect to the steel box girder to form multiple hoisting points, distributing the concentrated hoisting force into multiple hoisting points to ensure the steel box girder is hoisted horizontally and to avoid excessive local stress on the top plate of the steel box girder, which could cause deformation. A winch structure 4 is used at the top of the support truss 1, which is connected to the balancer 6 via a steel wire rope 5. The winch structures 4 in both hoisting devices simultaneously wind up the steel wire rope 5, pulling the two ends of the steel box girder. The hoisting mechanism 4 and the balancer 6 are used to simultaneously lift both ends of the steel box girder. Multiple lifting points are formed by connecting the balancer 6 to the steel box girder, and the tightness of each lifting point is fine-tuned to adjust the overall balance of the steel box girder. This ensures the steel box girder remains balanced during suspension, preventing tilting and rotation. Simultaneously, a guide rod 3 is connected between the hoisting structure 4 and the balancer 6. The guide rod 3 guides the steel box girder during lifting, further preventing rotation and swaying during hoisting and avoiding collisions with hoisting equipment or the connection points of the steel box girder. This prevents safety accidents and improves the overall safety of the hoisting operation. After vertical movement is completed, the hoisting structure 4 is stopped, and the first telescopic member 2 drives the hoisting structure 4 to move backward at the top of the supporting truss 1, ultimately completing the hoisting and splicing of the steel box girder.

[0027] See Figure 2 Optionally, the hoisting structure 4 includes a frame 401 movably mounted on the top of the supporting truss 1. A motor 402, a reducer 403, and two bearing seats 406 are mounted on the top of the frame 401. A drum 405 is rotatably mounted on the two bearing seats 406. The output shaft of the motor 402 is connected to the input shaft of the reducer 403, and the output shaft of the reducer 403 is connected to the drum 405. One end of the wire rope 5 is wound on the drum 405, and the other end is connected to the balance member 6.

[0028] In this embodiment, when the hoisting structure 4 is working, the motor 402 and the reducer 403 work together to drive the drum 405 to rotate slowly and uniformly on the two bearing seats 406, and to wind up the wire rope 5. When using two hoisting devices, the wire rope 5 is used to suspend the steel box girder at both ends, thereby achieving stable hoisting of the steel box girder and reducing the possibility of the steel box girder rotating and swaying.

[0029] See Figure 3 Optionally, the other end of the wire rope 5 is connected to the balance member 6 via a pulley block 407. The pulley block 407 includes a first pulley frame 4071 fixed to the bottom of the frame 401 and a second pulley frame 4074 fixed to the top of the balance member 6. A fixed pulley 4072 is rotatably mounted on the first pulley frame 4071, and a movable pulley 4075 is rotatably mounted on the second pulley frame 4074. The other end of the wire rope 5 passes through the bottom of the movable pulley 4075, the top of the fixed pulley 4072, and is fixed to the top of the second pulley frame 4074 in a counterclockwise direction.

[0030] In this embodiment, during the hoisting of the steel box girder using the wire rope 5, the other end of the wire rope 5 is fixed by sequentially passing the bottom of the movable pulley 4075, the top of the fixed pulley 4072, and the top of the wheel frame 4074 in a counterclockwise direction. During the winding process, the wire rope 5 is guided by the passive rotation of the movable pulley 4075 on the wheel frame 4071 and the passive rotation of the fixed pulley 4072 on the wheel frame 4074, so that it is continuously wound onto the drum 405. At the same time, the movable pulley 4075 rises together with the balancer 6 and the steel box girder, and the distance between the fixed pulley 4072 and the movable pulley 4075 is continuously shortened. Thus, the pulley block 407 achieves the labor-saving effect during the hoisting process and further protects the motor 402.

[0031] Specifically, in each lifting device, multiple wire ropes 5 are used, with one end of each wire rope 5 wound around a different position on a drum 405. The number of pulley blocks 407 used corresponds to the number of wire ropes 5, so that the other end of each wire rope 5 is connected to the balance member 6 through the pulley block 407. When the drum 405 winds up multiple wire ropes 5 together, multiple pulley blocks 407 perform the labor-saving work of lifting the corresponding wire ropes 5. Using multiple wire ropes 5 at each end of the steel box girder for lifting improves the lifting stability (at this time, multiple wire ropes 5 at one end of the steel box girder are equivalent to a thickened wire rope). A guide pulley 4073 is rotatably mounted on the wheel frame 4071, located on one side of the fixed pulley 4072 (e.g., Figure 3In the middle, located behind the fixed pulley 4072, when the drum 405 rotates clockwise to wind and coil the wire rope 5, the wire rope 5 first passes around the guide pulley 4073 away from the fixed pulley 4072, and then passes around the bottom of the movable pulley 4075, the top of the fixed pulley 4072, and is fixed to the top of the wheel frame 4074 in a counterclockwise direction. This facilitates the auxiliary guidance and conveying of the wire rope 5 and avoids interference with the equipment when the wire rope 5 is coiled or uncoiled.

[0032] See Figure 2 Optionally, one end of the first telescopic member 2 is connected to the support truss 1, and the other end is connected to the frame 401. Wheel rails 101 are installed on both the top left and right sides of the support truss 1, and a track wheel 404 that cooperates with the wheel rails 101 is rotatably installed at the bottom of the frame 401.

[0033] In this embodiment, by connecting one end of the first telescopic member 2 to the support truss 1 and the other end to the frame 401, it is convenient for the first telescopic member 2 to extend and retract to push and pull the frame 401 in the front and back direction on the top of the support truss 1. When the first telescopic member 2 extends and retracts, the track wheel 404 rolls along the wheel rail 101, which facilitates the front and back movement of the frame 401 on the top of the support truss 1, and further facilitates the hoisting and splicing of the steel box girder in the front and back positions.

[0034] See Figure 2 Optionally, a guide sleeve 408 is fixedly connected to the front side of the frame 401, the bottom end of the guide rod 3 is fixed to the balance component 6, and a guide through hole 4081 is provided on the guide sleeve 408 to cooperate with the guide rod 3.

[0035] In this embodiment, when the steel box girder is hoisted, the guide rod 3 is driven to rise continuously in the guide through hole 4081, and then the guide sleeve 408 guides the guide rod 3 to move vertically, so as to ensure the stability of the steel box girder during hoisting and avoid swaying.

[0036] Specifically, the inner diameter of the guide hole 4081 is larger than the outer diameter of the guide rod 3, so that there is a certain gap / distance between the inner wall of the guide hole 4081 and the guide rod 3.

[0037] See Figure 1 Optionally, the balancing component 6 includes a balancing beam 601, with electric hoists 602 installed at both ends of the balancing beam 601. The hooks of the electric hoists 602 hook onto the prefabricated lifting lugs on the top surface of the steel box girder to form lifting points.

[0038] In this embodiment, the electric hoist 602 operates to move the hook away from or closer to itself, thus achieving the lifting and lowering action of the hook. The guide through-hole 4081 and the guide rod 3 are fitted with a certain gap, facilitating tightening and loosening at each lifting point (when each lifting point is tightened and loosened, the steel box girder gradually returns to a balanced state from its original tilted state, and simultaneously the central axis of the guide rod 3 gradually coincides with the center line of the guide through-hole 4081), allowing for fine-tuning of the tightness of each lifting point and thus adjusting the overall balance of the steel box girder.

[0039] Specifically, two electric hoists 602 are installed at the front and rear ends of the balance beam 601. The hook of each electric hoist 602 hooks onto the prefabricated lifting lug on the top surface of the steel box girder to form a small lifting point. The two small lifting points at the front end of the balance beam 601 together form a large lifting point, and the two small lifting points at the rear end of the balance beam 601 together form another large lifting point. This ensures that if one small lifting point fails, the other small lifting point will take over, avoiding the possibility of detachment at each lifting point, thereby preventing the steel box girder from losing balance during hoisting and improving safety. In addition, multiple small lifting points facilitate the distribution of concentrated lifting force into multiple lifting points, ensuring the steel box girder is lifted horizontally and preventing excessive local stress on the top plate of the steel box girder from causing deformation.

[0040] It should be noted that after the prefabricated lifting lugs on the top surface of the steel box girder are hoisted, some are retained, while others need to be cut, ground, and then coated with anti-corrosion paint.

[0041] See Figure 4 Optionally, a counterweight base frame 7 is slidably provided at the bottom of the support truss 1 in the front-to-back direction, and second telescopic members 8 that can be adjusted in the vertical direction are symmetrically provided on the left and right sides of the support truss 1.

[0042] In this embodiment, the support stability of the support truss 1 when it is used in the hoisting position on the bridge is enhanced by the counterweight base frame 7 (which has a certain weight). Then, the second telescopic member 8 extends vertically and acts on the bridge surface to increase the stress area of ​​the support truss 1 on the bridge and improve stability.

[0043] Specifically, the top of the second expansion member 8 is fixedly connected to the supporting truss 1, and the bottom is fixedly connected to a disc. When the second expansion member 8 extends and the bottom contacts and presses against the bridge surface, the disc increases the contact area between the bottom of the second expansion member 8 and the bridge surface, thereby improving the support stability of the second expansion member 8.

[0044] It should be noted that the first telescopic component 2 and the second telescopic component 8 are preferably hydraulic cylinders, which can provide sufficiently strong power.

[0045] See Figure 4Optionally, the connecting beam 702 of the counterweight base frame 7 is provided with several bolt through holes 9 for use with high-strength bolts to anchor the steel box girder.

[0046] In this embodiment, by inserting high-strength bolts into the bolt through holes 9 and then screwing them into the prefabricated internal thread bolt holes on the steel box girder corresponding to the bolt through holes 9, the counterweight base frame 7 and the steel box girder are anchored and fixed, thereby further improving the support stability of the support truss 1 when it is used in the hoisting position on the bridge and preventing it from tipping over.

[0047] See Figure 4 and Figure 5 Optionally, support slides 10 are fixedly connected to the bottom left and right sides of the support truss 1. The support slides 10 slide in slidable engagement with the beam rail 701 of the counterweight base frame 7. Steel balls 11 are rotatably installed on the upper and lower sides inside the support slides 10.

[0048] In this embodiment, after completing the hoisting and splicing of a steel box girder, the anchorage between the counterweight base frame 7 and the steel box girder is released, and the second telescopic member 8 continues to extend vertically, separating the bottom surface of the counterweight base frame 7 from the bridge surface. At this time, the second telescopic member 8 provides main support for the entire hoisting equipment (at this time, the first telescopic member 2 is fully retracted, and the hoisting structure 4 is located at the top rear of the support truss 1 to prevent the equipment from tilting forward). Simultaneously, the steel balls 11 on the lower side inside the support slide 10 support the beam rail 701 of the counterweight base frame 7. The operator pushes the counterweight base frame 7 forward, and the steel balls 11 on the lower side inside the support slide 10 rotate, causing the counterweight base frame 7 to slide forward on the support slide 10. After reaching the designated position, the equipment is then... The second telescopic member 8 retracts vertically, allowing the counterweight base frame 7 to rest on the bridge deck. The second telescopic member 8 continues to retract and separate from the bridge deck. At this point, the counterweight base frame 7 provides the main support for the entire hoisting equipment. The operators push the support truss 1 forward, and the steel ball 11 on the upper side inside the support slide 10 rotates, causing the support truss 1 to slide forward on the beam rail 701 of the counterweight base frame 7 via the support slide 10. After reaching the designated position, the second telescopic member 8 extends vertically, causing the bottom disc to exert force on the bridge deck. The second telescopic member 8 and the counterweight base frame 7 together support the support truss 1. Then, the counterweight base frame 7 is re-anchored and fixed to the steel box girder, and the next steel box girder hoisting work is carried out.

[0049] See Figure 4 and Figure 5 Optionally, limit blocks 12 are fixedly connected to both sides of the support slide 10, and limit pins 13 are inserted and removed between the limit blocks 12 and the beam rail 701 of the counterweight base frame 7.

[0050] In this embodiment, when the steel box girder is hoisted, the limiting block 12 is inserted and fixed to the beam rail 701 of the counterweight base frame 7 by the limiting pin 13, and the support slide 10 and the beam rail 701 of the counterweight base frame 7 are further limited and fixed, thereby improving the connection stability of the support truss 1 on the counterweight base frame 7 when hoisting the steel box girder, so that the support truss 1 can provide stable support.

[0051] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A steel box girder hoisting device for bridges, characterized in that, It includes two hoisting devices, one for connecting the two ends of the steel box girder; The hoisting device includes a support truss (1), a first telescopic member (2), a hoisting structure (4), and a balancing member (6). The first telescopic member (2) is used to drive the hoisting structure (4) to move back and forth on the top of the support truss (1). The balance component (6) is connected to the steel box girder to form multiple lifting points, which are used to adjust the balance of the steel box girder; The hoisting structure (4) is connected to the balance component (6) via a wire rope (5) and is used to raise and lower the steel box girder by winding and unwinding the wire rope (5). A guide rod (3) is movably connected between the hoisting structure (4) and the balancing component (6) for guiding the steel box girder during lifting and lowering.

2. The bridge steel box girder hoisting equipment according to claim 1, characterized in that, The hoisting structure (4) includes a frame (401) movably mounted on the top of the supporting truss (1). A motor (402), a reducer (403) and two bearing seats (406) are mounted on the top of the frame (401). A drum (405) is rotatably mounted on the two bearing seats (406). The output shaft of the motor (402) is connected to the input shaft of the reducer (403). The output shaft of the reducer (403) is connected to the drum (405). One end of the wire rope (5) is wound on the drum (405), and the other end is connected to the balance member (6).

3. The bridge steel box girder hoisting equipment according to claim 2, characterized in that, The other end of the wire rope (5) is connected to the balance component (6) through a pulley block (407). The pulley block (407) includes a wheel frame one (4071) fixed to the bottom of the frame (401) and a wheel frame two (4074) fixed to the top of the balance component (6). A fixed pulley (4072) is rotatably mounted on the wheel frame one (4071), and a movable pulley (4075) is rotatably mounted on the wheel frame two (4074). The other end of the wire rope (5) passes through the bottom of the movable pulley (4075), the top of the fixed pulley (4072) and the top of the wheel frame two (4074) in a counterclockwise direction and is fixed.

4. The bridge steel box girder hoisting equipment according to claim 2, characterized in that, One end of the first telescopic member (2) is connected to the support truss (1), and the other end is connected to the frame (401). The top left and right sides of the support truss (1) are equipped with wheel rails (101), and the bottom of the frame (401) is rotatably equipped with a track wheel (404) that cooperates with the wheel rails (101).

5. The bridge steel box girder hoisting equipment according to claim 2, characterized in that, The front side of the frame (401) is fixedly connected to a guide sleeve (408), the bottom end of the guide rod (3) is fixed to the balance component (6), and the guide sleeve (408) is provided with a guide through hole (4081) that is movable and cooperates with the guide rod (3).

6. The bridge steel box girder hoisting equipment according to claim 5, characterized in that, The balancing component (6) includes a balancing beam (601), and electric hoists (602) are installed at both ends of the balancing beam (601). The hooks of the electric hoists (602) hook onto the prefabricated lifting lugs on the top surface of the steel box girder to form lifting points.

7. The bridge steel box girder hoisting equipment according to claim 1, characterized in that, The bottom of the support truss (1) is provided with a counterweight base frame (7) that slides along the front-back direction, and the left and right sides of the support truss (1) are symmetrically provided with second telescopic components (8) that can be adjusted in the vertical direction.

8. The bridge steel box girder hoisting equipment according to claim 7, characterized in that, The counterweight base frame (7) has several bolt through holes (9) on the connecting beam (702) for use with high-strength bolts to anchor the steel box girder.

9. The bridge steel box girder hoisting equipment according to claim 7, characterized in that, The bottom left and right sides of the support truss (1) are fixedly connected to support slides (10). The support slides (10) are slidably engaged with the beam rail (701) of the counterweight base frame (7). Steel balls (11) are rotatably installed on the upper and lower sides inside the support slides (10).

10. The bridge steel box girder hoisting equipment according to claim 9, characterized in that, Limiting blocks (12) are fixedly connected to both sides of the support slide (10), and limiting pins (13) are inserted and removed between the limiting blocks (12) and the beam rail (701) of the counterweight base frame (7).

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