Combined lifting point self-adaptive steel box girder lifting appliance
By designing a steel box girder that combines lifting points adaptive, the problem of hanging points mismatch in the existing technology is solved, the adaptation of different sizes and positions is achieved, safety and load-bearing capacity are improved, and the stress and deformation control of steel box girder hoisting is ensured.
Patent Information
- Application Number
- CN202510023649.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-04-15
AI Technical Summary
The prior art is difficult to adapt to bridge steel box girder lifting points of different sizes and locations, resulting in mismatch of lifting points, affecting the stress and deformation control of the steel box girder, and posing safety hazards.
A combination of lifting point adaptive steel box girder sling is designed. By setting up multiple sets of upper and lower lifting points on the main beam, and connecting them with the crane main hook and the temporary lifting points of the steel box girder through a wire rope, the flexible adjustment of the lifting points and vertical stress are achieved.
The adaptation of steel box girders and lifting points in different sizes is achieved, additional stress is avoided, the safety and load-bearing capacity of the spreader is improved, and the stress and deformation control of the lifting of the steel box girder is ensured.
Smart Images
Figure CN119822204A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a combined lifting point adaptive steel box girder lifting device. Background Art
[0002] At present, more and more bridges with steel box girder structures are being built in China. The steel box girder structure of a bridge is generally manufactured in a factory and then transported by water to the bridge installation point for erection. When a large steel box girder is hoisted onto a ship, in order to ensure that each hoisting point is evenly stressed and does not cause a large deformation of the steel box girder, multiple temporary hoisting points are generally designed on the bridge deck to achieve hoisting and loading of the steel box girder onto the ship.
[0003] At this time, the random distribution of temporary lifting points of different steel box girders and the adaptation of the lifting equipment have become technical problems that need to be solved urgently in the actual construction process. In actual construction, the size, lifting point position and lifting point elevation of each steel box girder are not fixed. The use of lifting equipment with fixed size and fixed lifting point position will cause the number and position of lifting points to be mismatched. Even if the lifting equipment is designed according to the size and lifting point position of conventional bridge steel box girders, there is still a phenomenon that the lifting point of the lifting equipment does not match the lifting point of the steel box girder, and the lifting rope is often tilted, which is not conducive to the force and deformation control of the steel box girder.
[0004] Therefore, fixed lifting points and fixed size slings can no longer adapt to the changes in the steel box girder structure of bridges, and their scope of use is very limited. If a sling with adjustable sliding points is used, due to the large size and heavy weight of the steel box girder structure of bridges, it is very easy for the lifting point to slip under the influence of the dynamic load of the lifting operation, causing serious safety accidents.
[0005] Based on the above reasons, for the lifting of steel box girders of large bridges, it is an urgent problem to design a steel box girder lifting device that can easily adjust the lifting point position, ensure the vertical force of the temporary lifting point of the steel box girder, and ensure safe construction. Summary of the invention
[0006] In view of the problems existing in the prior art, the present invention designs a combined lifting point adaptive steel box girder lifting device, which can adapt to steel box girders of different sizes and lifting point positions, ensure that the lifting points of the steel box girder are subjected to vertical force, avoid the generation of additional stress, and facilitate the force and deformation control of the steel box girder during lifting.
[0007] The present invention provides a combined lifting point adaptive steel box girder lifting device, comprising a main beam, characterized in that the main beam is provided with a plurality of upper lifting points connected to a main hook of a crane through steel wire ropes, and the upper lifting points are symmetrically distributed on the main beam at fixed intervals, and the main beam is also provided with a plurality of lower lifting points connected to temporary lifting points of the steel box beam through steel wire ropes, and the lower lifting points are symmetrically distributed on the main beam at fixed intervals.
[0008] Furthermore, the upper hanging point is located on the midline of two adjacent lower hanging points.
[0009] Furthermore, the main beam is a single-box structure with a rectangular cross-section, and the upper hanging point is arranged above the single-box structure, and the lower hanging point is arranged below the single-box structure.
[0010] Furthermore, a crossbeam for setting the upper hanging point is provided above the single-box structure.
[0011] Furthermore, a pair of connecting plates extend downwardly from both sides of the single-box structure at corresponding positions of the lower hanging points, and the lower hanging points are provided with a pair of connecting ear plates, and the connecting ear plates are connected to the connecting plates by bolts.
[0012] Furthermore, a reinforced partition is provided in the inner cavity of the single-box structure.
[0013] Compared with the prior art, the outstanding effects of the present invention are: ① The sling is designed with several groups of upper and lower lifting points, which can meet the needs of temporary lifting points of steel box girders of different sizes and in different positions, and the sling has strong versatility; ② The force of the sling is reasonable, which effectively avoids the phenomenon of oblique lifting and crooked lifting, and has high safety; ③ The layout of the upper and lower lifting points is reasonable, so that the local bending moment of the sling is minimized; ④ Compared with the truss type sling, the present invention converts most of the force of the sling into axial pressure without reducing the lifting capacity, thereby improving the carrying capacity of the sling. In order to ensure the stability of the long and thin rod, a reasonable cross-section form is designed, and its weight is lighter than that of the previous truss type sling. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the main beam structure;
[0015] Figure 2 It is a schematic diagram of the lower suspension point structure;
[0016] Figure 3 It is a schematic diagram of lifting conditions. DETAILED DESCRIPTION
[0017] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.
[0018] The left half of the main beam 1 of this embodiment is as shown in FIG. Figure 1 As shown, the main beam 1 is a single-box structure with a rectangular cross section. In order to ensure firmness, a partition 6 is arranged inside. The upper hanging point 2 is arranged on the main beam 1 and distributed on the main beam 1 at a fixed interval. The lower hanging point 3 is arranged below the main beam 1 and distributed on the main beam 1 at a fixed interval.
[0019] When designing the size of the main beam 1 in this embodiment, statistics were made on the structural sizes, weights, and temporary lifting point positions of various types of bridge steel box beams during construction in previous years. Combined with the lifting characteristics of gantry cranes, double main hooks, each with a lifting device, were used to ensure that the length of the main beam 1 and the position of the lower lifting point 3 can cover more than 90% of the steel box beam structure lifting requirements.
[0020] In order to reduce the weight and structural dimensions of the main beam 1, this embodiment does not adopt the traditional truss structure, but designs it as a single box structure with a rectangular cross-section, the length of which covers the temporary lifting point of the steel box beam. Considering that when the gantry crane is hoisted by wire rope, the hoist is mainly subjected to the horizontal axial force, followed by vertical bending, and then the stress and deformation characteristics of out-of-plane bending, when designing the cross-section of the main beam 1, the vertical height is increased to resist the axial force and vertical bending, and the transverse section size is minimized to meet the out-of-plane bending, so as to improve the average force of each upper hanging point 2 and lower hanging point 3.
[0021] The upper hanging point 2 is connected to the main hook of the gantry crane through a wire rope. In order to minimize the additional bending moment caused by the lateral difference between the upper hanging point 2 and the lower hanging point 3, the upper hanging point 2 is arranged just above the center of the two lower hanging points 3 in this embodiment.
[0022] like Figure 2 As shown, considering that the transverse slopes of the steel box girders of each bridge are different and there are height differences between the temporary hanging points of each group, in this embodiment, a connecting ear plate 5 is provided at the lower hanging point 3, and a connecting plate 4 is correspondingly provided on the main beam 1, and an array of connecting holes, preferably 3×5 connecting holes, are provided at the connecting part of the two. The bolting position of the connecting ear plate 5 and the connecting plate 4 can be adjusted to adapt to the height difference of the temporary hanging point of the steel box girder.
[0023] In this embodiment, in order to facilitate disassembly and assembly, the upper hanging point 2 and the lower hanging point 3 are connected to the wire rope by a pin connection, and a high-strength bolt connection can also be selected.
[0024] like Figure 3 As shown, during the lifting construction, according to the position of the temporary lifting point of the steel box girder, the position of the wire rope connecting the lower lifting point 3 is adjusted in time, so that this embodiment can be matched with the temporary lifting point group of the steel box girder, effectively avoiding the oblique lifting problem existing in the fixed lifting point.
Claims
1. A combined lifting point adaptive steel box girder sling, comprising a main beam (1), characterized in that: The main beam (1) is provided with a plurality of groups of upper hanging points (2) connected to a main hook of a crane via steel wire ropes, and the upper hanging points (2) are symmetrically distributed on the main beam (1) at a fixed interval. The main beam (1) is also provided with a plurality of groups of lower hanging points (3) connected to temporary hanging points of a steel box beam via steel wire ropes, and the lower hanging points (3) are symmetrically distributed on the main beam (1) at a fixed interval.
2. The combined lifting point adaptive steel box girder lifting device according to claim 1 is characterized in that: The upper hanging point (2) is located on the midline of two adjacent lower hanging points (3).
3. The combined lifting point adaptive steel box girder lifting device according to claim 1 or 2, characterized in that: The main beam (1) is a single-box structure with a rectangular cross-section, the upper hanging point (2) is arranged above the single-box structure, and the lower hanging point (3) is arranged below the single-box structure.
4. The combined lifting point adaptive steel box girder lifting device according to claim 3 is characterized in that: A crossbeam on which the hanging point (2) is arranged is provided above the single-box structure.
5. The combined lifting point adaptive steel box girder lifting device according to claim 3 is characterized in that: A pair of connecting plates (4) are extended downwardly at corresponding positions of the lower hanging point (3) on both sides of the single-box structure, and the lower hanging point (3) is provided with a pair of connecting ear plates (5), and the connecting ear plates (5) are connected to the connecting plates (4) by bolts.
6. The combined lifting point adaptive steel box girder lifting device according to claim 3 is characterized in that: A reinforcing partition plate (6) is arranged in the inner cavity of the single-box structure.