A type of lifting tool for steel box girders
By designing a steel box girder lifting device that includes locking and adjustment mechanisms, the problems of instability and inability to adjust the center of gravity of existing lifting devices have been solved, resulting in a more stable lifting process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CCCC (CHONGQING) HEAVY IND CO LTD
- Filing Date
- 2025-09-16
- Publication Date
- 2026-08-04
AI Technical Summary
The existing steel box girder lifting equipment is not stable enough during the lifting process and cannot be adjusted according to the center of gravity of different steel box girders, which may cause tilting or rotation during lifting.
A steel box girder lifting device was designed, which includes a spreader beam, lifting lugs, a locking mechanism, and an adjustment mechanism. The locking mechanism securely fixes the box girder, and the adjustment mechanism adjusts the position of the lifting lugs to adapt to the center of gravity of different box girders.
It improves the stability and adaptability of hoisting, ensuring the safety and efficiency of the hoisting process.
Smart Images
Figure CN224590534U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge engineering, and in particular to a lifting device for steel box girders. Background Technology
[0002] A steel box girder is a box-shaped beam structure made of steel plates connected by welding and other processes. Steel box girders are widely used in various bridge projects, including highway bridges, railway bridges, and urban overpasses. They play a crucial role in bridge engineering. As the main load-bearing structure of a bridge, they transfer the load of the superstructure to the substructure's piers or foundations, ensuring the overall stability and safety of the bridge. Furthermore, steel box girders have good span capacity, adaptable to various spans and bridge types. They possess advantages such as high load-bearing capacity, good stability, simple construction, and good durability.
[0003] Steel box girders are typically prefabricated in a factory and then transported to the construction site for assembly, significantly reducing on-site construction time and workload. During the assembly and transfer of steel box girders, lifting equipment is required. Existing steel box girder lifting equipment primarily consists of a spreader beam and lifting lugs welded to it. This type of lifting equipment relies solely on the spreader beam for support, making it unstable during lifting. Furthermore, the fixed positions of the lifting lugs mean that different steel box girders have different weights and centers of gravity, preventing the fixed lugs from adjusting to the girder's center of gravity. This can lead to tilting or even rotation during lifting. Utility Model Content
[0004] The purpose of this utility model is to provide a steel box girder hoisting tool to solve the technical problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A steel box girder hoisting device includes a spreader beam, lifting lugs, a locking mechanism, and an adjusting mechanism. The spreader beam is horizontally positioned. Two lifting lugs are provided and are respectively located on the left and right sides of the top surface of the spreader beam via the adjusting mechanism. The lifting lugs can move left and right on the spreader beam via the adjusting mechanism. The locking mechanism is located on the lifting lugs.
[0007] Furthermore, the locking mechanism includes an outer baffle, an inner baffle, a rotating rod, a locking block, and a locking rod; the outer baffle is inclinedly disposed on the side of the lifting lug away from the center of the spreader beam; the inner baffle is inclinedly disposed on the side of the lifting lug close to the center of the spreader beam; the rotating rod is horizontally disposed on the lifting lug, with its two ends extending forward and backward respectively, and the rotating rod can rotate on the lifting lug; two locking blocks are provided, respectively sleeved on the front and rear sides of the rotating rod, and can move on the rotating rod, with an inclined bevel on one side of the locking block; the bevel contacts the side wall of the outer baffle; one end of the locking rod is fixedly connected to the side wall of the locking block.
[0008] Furthermore, the rotating rod has threads on its front and rear side walls; the locking mechanism also includes locking nuts; there are two locking nuts, which are connected to the front and rear sides of the rotating rod respectively through the threads on the front and rear sides of the rotating rod.
[0009] Furthermore, the adjustment mechanism includes a support base and an adjustment component; the support base is horizontally fixedly installed on the bottom surface of the lifting lug, and its front and rear side walls extend outwards from the front and rear sides of the top of the spreader beam; the adjustment component is a U-shaped structure with an upward opening, its top surface is fixedly connected to the front and rear sides of the bottom of the support base, and its bottom surface extends downwards outwards from the bottom surface of the spreader beam.
[0010] Furthermore, two adjustment members are provided at intervals on the left and right sides.
[0011] Furthermore, it also includes a limiting mechanism; the limiting mechanism is located on the left and right sides of the bottom surface of the spreader beam, and the limiting mechanism includes limiting blocks; multiple limiting blocks are arranged at intervals on the left and right sides.
[0012] Furthermore, the front side of the limiting block extends outward from the front side of the bottom of the spreader beam.
[0013] Furthermore, it also includes support legs; the support legs are vertically arranged on the left and right sides of the bottom surface of the spreader beam.
[0014] The advantages of this utility model compared to the prior art are as follows:
[0015] 1. This utility model, by setting a locking mechanism, uses a locking block in conjunction with an outer baffle to lock the locking rod onto the flange plate of the box girder, thereby firmly fixing the box girder in the lifting device and improving the lifting stability.
[0016] 2. This utility model, by setting an adjustment structure, can adjust the position of the lifting lugs to adapt to the center of gravity of different box girders, thereby further improving the lifting stability. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Figure 2 This is a front view of the present invention;
[0019] Figure 3 This is a schematic diagram of the connection structure of the locking mechanism of this utility model;
[0020] Figure 4 This is a front view of the lifting lug of this utility model;
[0021] Figure 5 This is the left view of this utility model;
[0022] Figure 6 This is a left view of the present invention during adjustment;
[0023] In the attached diagram,
[0024] 1-Carrying beam; 2-Lifting lug;
[0025] 3-Locking mechanism; 31-Outer baffle; 32-Inner baffle; 33-Rotating rod; 34-Locking block; 35-Locking rod; 36-Locking nut
[0026] 4-Adjusting mechanism; 41-Support base; 42-Adjusting component;
[0027] 5 - Limiting mechanism; 51 - Limiting block;
[0028] 6-legs. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the utility model, and these aspects can be achieved even without these specific details.
[0030] like Figure 1-6 As shown, a steel box girder lifting device includes a spreader beam 1, lifting lugs 2, a locking mechanism 3, and an adjusting mechanism 4. The spreader beam 1 is horizontally positioned. Two lifting lugs 2 are respectively located on the left and right sides of the top surface of the spreader beam 1 via the adjusting mechanism 4, allowing the lifting lugs 2 to move left and right on the spreader beam 1. The locking mechanism 3 is located on the lifting lugs 2. When the lifting device is placed inside the box girder, the top surface of the spreader beam 1 contacts the bottom surface of the box girder's flange plate for support, and the locking mechanism 3 contacts the top surface of the box girder's flange plate to lock the box girder and prevent it from falling off. The lifting lugs 2 can be adjusted in position on the spreader beam 1 via the adjusting mechanism 4 to match the center of gravity of the box girder.
[0031] like Figure 3-4As shown, the locking mechanism 3 includes an outer baffle 31, an inner baffle 32, a rotating rod 33, a locking block 34, and a locking rod 35. The outer baffle 31 is inclinedly disposed on the side of the lifting lug 2 away from the center of the spreader beam 1. The inner baffle 32 is inclinedly disposed on the side of the lifting lug 2 close to the center of the spreader beam 1. The rotating rod 33 is horizontally disposed on the lifting lug 2, with its two ends extending forward and backward respectively, and the rotating rod 33 can rotate on the lifting lug 2. There are two locking blocks 34, which are respectively sleeved on the front and rear sides of the rotating rod 33 and can move and rotate on the rotating rod 33. One side of the locking block 34 is provided with an inclined bevel. The bevel contacts the side wall of the outer baffle 31. One end of the locking rod 35 is fixedly connected to the side wall of the locking block 34. Before hoisting, the locking block 34 is moved out of the outer baffle 31, allowing the locking block 34 to rotate on the rotating rod 33. Rotating the locking block 34 causes the locking rod 35 to rotate away from the box girder flange, thus allowing the lifting device to be smoothly placed into the box girder. During hoisting, the locking block 34 is rotated, causing the locking rod 35 to move closer to the box girder flange, thus rotating the locking rod 35 between the shear studs of the flange and blocking the top surface of the flange. Then, the locking block 34 is moved into the outer baffle 31, so that its bevel fits against the inner wall of the outer baffle 31, locking the locking block 34 and preventing it from rotating, thereby locking the box girder and preventing it from falling off.
[0032] The rotating rod 33 has threads on its front and rear side walls; the locking mechanism 3 also includes locking nuts 36; there are two locking nuts 36, which are connected to the front and rear sides of the rotating rod 33 respectively through threads on the front and rear sides. When the locking block 34 moves into the outer baffle 31, the locking nuts 36 are screwed in to prevent the locking block 34 from moving on the outer baffle 31.
[0033] The adjustment mechanism 4 includes a support base 41 and an adjustment component 42. The support base 41 is horizontally fixed to the bottom surface of the lifting lug 2, and its front and rear side walls extend outwards from the front and rear sides of the top of the spreader beam 1. The adjustment component 42 is a U-shaped structure with an upward opening, its top surface is fixedly connected to the front and rear sides of the bottom of the support base 41, and its bottom surface extends downwards outwards from the bottom surface of the spreader beam 1. The support base 41 and the adjustment component 42 form a frame structure. When the support base 41 and the adjustment component 42 are moved, the lifting lug 2 can be moved, thereby adjusting the position of the lifting lug 2.
[0034] Two adjusting members 42 are provided at intervals on the left and right sides. The two adjusting members 42 can improve the stability of the adjusting mechanism 4.
[0035] It also includes a limiting mechanism 5; the limiting mechanism 5 is located on the left and right sides of the bottom surface of the spreader beam 1, and the limiting mechanism 5 includes limiting blocks 51; multiple limiting blocks 51 are spaced apart on the left and right sides. The adjusting component 42 of the adjusting mechanism 4 moves between two adjacent limiting blocks 51. During hoisting, the lifting lug 2 and the adjusting mechanism 4 move upward, so that the adjusting component 42 is locked between adjacent limiting blocks 51, preventing the lifting lug 2 from moving during hoisting.
[0036] like Figure 5-6 As shown, the front side of the limiting block 51 extends beyond the front side of the bottom of the spreader beam 1. When adjusting the position of the lifting lug 2, the adjusting mechanism 4 can be moved forward so that the adjusting member 42 forms a certain gap with the front side of the limiting block 51. At this time, the adjusting mechanism 4 can be moved smoothly. After the position of the lifting lug 2 is adjusted, the adjusting mechanism 4 can be moved backward so that the adjusting member 42 is locked between the adjacent limiting blocks 51 to position the adjusting member 42 and prevent the lifting lug 2 from moving before hoisting.
[0037] It also includes support legs 6; the support legs 6 are vertically arranged on the left and right sides of the bottom surface of the spreader beam 1. The support legs 6 support the spreader beam 1, making it easy to adjust the position of the lifting lugs 2 using the adjustment mechanism 4.
[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A lifting device for steel box girders, comprising a spreader beam, lifting lugs, a locking mechanism, and an adjusting mechanism, characterized in that: The spreader beam is horizontally set; there are two lifting lugs, which are respectively set on the left and right sides of the top surface of the spreader beam through the adjustment mechanism, and the lifting lugs can move left and right on the spreader beam through the adjustment mechanism; the locking mechanism is set on the lifting lugs.
2. The steel box girder hoisting tool according to claim 1, characterized in that: The locking mechanism includes an outer baffle, an inner baffle, a rotating rod, a locking block, and a locking rod. The outer baffle is inclined on the side of the lifting lug away from the center of the spreader beam. The inner baffle is inclined on the side of the lifting lug closer to the center of the spreader beam. The rotating rod is horizontally mounted on the lifting lug, with its two ends extending forward and backward respectively, and the rotating rod can rotate on the lifting lug. There are two locking blocks, which are respectively fitted on the front and rear sides of the rotating rod and can move on the rotating rod. One side of the locking block has an inclined bevel. The bevel contacts the side wall of the outer baffle. One end of the locking rod is fixedly connected to the side wall of the locking block.
3. The steel box girder hoisting tool according to claim 2, characterized in that: The rotating rod has threads on its front and rear side walls; the locking mechanism also includes locking nuts; there are two locking nuts, which are connected to the front and rear sides of the rotating rod respectively through the threads on the front and rear sides of the rotating rod.
4. The steel box girder hoisting tool according to claim 1, characterized in that: The adjustment mechanism includes a support base and an adjustment component; the support base is horizontally fixedly installed on the bottom surface of the lifting lug, and its front and rear side walls extend outwards from the front and rear sides of the top of the spreader beam; the adjustment component is a U-shaped structure with an upward opening, its top surface is fixedly connected to the front and rear sides of the bottom of the support base, and its bottom surface extends downwards outwards from the bottom surface of the spreader beam.
5. The steel box girder hoisting tool according to claim 4, characterized in that: The aforementioned adjusting element is provided in two spaced apart on the left and right sides.
6. The steel box girder hoisting tool according to claim 5, characterized in that: It also includes a limiting mechanism; the limiting mechanism is located on the left and right sides of the bottom surface of the spreader beam, and the limiting mechanism includes a limiting block; multiple limiting blocks are arranged at intervals on the left and right sides.
7. The steel box girder lifting device according to claim 6, characterized in that: The front side of the limiting block extends outward from the front side of the bottom of the spreader beam.
8. The steel box girder lifting device according to claim 4, characterized in that: It also includes support legs; the support legs are vertically installed on the left and right sides of the bottom surface of the spreader beam.