Combined lifting point self-adaptive steel box girder lifting appliance
By designing a combined lifting point adaptive steel box girder lifting tool, the problem of mismatch between the lifting tool and the lifting points of the steel box girder was solved, the versatility and safety of the lifting tool were improved, and the stress rationality and safety of the steel box girder lifting were ensured.
Patent Information
- Application Number
- CN202520032289.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-01-07
AI Technical Summary
The existing lifting equipment with fixed size and fixed position cannot adapt to the lifting points of bridge steel box girders of different sizes and positions, resulting in mismatch of lifting points and the phenomenon of slanted lifting by the lifting rope, which affects the stress and deformation control of the steel box girder and poses a safety hazard.
Design a combined lifting point adaptive steel box girder lifting tool, which adopts a single box girder with a rectangular cross section, sets several sets of upper and lower lifting points, connected by steel wire ropes, with fixed spacing between the lifting points, to adapt to the lifting point requirements of steel box girders of different sizes and positions, and adjusts the elevation difference by connecting ear plates to ensure that the lifting points are vertically stressed.
This improved the versatility and safety of the lifting equipment, avoided oblique pulling and skewed lifting, enhanced load-bearing capacity and stress rationality, reduced the weight of the lifting equipment and local bending moment, and ensured the safety and stability of steel box girder hoisting.
Smart Images
Figure CN223632906U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to bridge engineering technical field, concretely relates to a kind of combined lifting point self-adapting steel box girder lifting appliance. BACKGROUND
[0002] At present, in domestic bridge construction, the bridge with steel box girder structure is more and more. The steel box girder structure of bridge is generally manufactured in factory, and then transported to bridge site installation point to erect. When large steel box girder is hoisted on ship, in order to realize uniform stress of each lifting point, and not cause large deformation of steel box girder, generally multiple temporary lifting points are designed on bridge deck, and steel box girder hoisting is realized through temporary lifting point.
[0003] At this time, random distribution of different steel box girder temporary lifting points and adaptation of lifting appliance become technical problems to be solved urgently in actual construction process. In actual construction, steel box girder size, lifting point position and lifting point elevation of each project are not fixed, and lifting appliance with fixed size and fixed lifting point position will cause lifting point number and position mismatch. Even if lifting appliance is designed according to conventional bridge steel box girder size and lifting point position, lifting point of lifting appliance and steel box girder lifting point are still mismatched, and lifting rope is often inclined, which is not conducive to stress and deformation control of steel box girder.
[0004] Therefore, lifting appliance with fixed lifting point and fixed size cannot adapt to change of bridge steel box girder structure, and its use range is very limited. If sliding adjustable lifting point lifting appliance is used, due to large size and heavy weight of bridge steel box girder structure, lifting point is prone to sliding under influence of dynamic load of hoisting operation, and serious safety accident is caused.
[0005] Based on the above reasons, for large bridge steel box girder hoisting, it is an urgent problem to design steel box girder lifting appliance which can conveniently adjust lifting point position, ensure vertical stress of steel box girder temporary lifting point and guarantee safe construction. SUMMARY
[0006] In view of problems existing in prior art, the utility model discloses a kind of combined lifting point self-adapting steel box girder lifting appliance, can realize the adaptation of different size steel box girder and lifting point position, ensure vertical stress of steel box girder lifting point, avoid additional stress, and be conducive to stress and deformation control when steel box girder hoisting.
[0007] The utility model provides a kind of combined lifting point self-adapting steel box girder lifting appliance, including main girder, it is characterized in that, the main girder is provided with several groups of upper lifting point connected with crane main hook by steel wire rope, the upper lifting point is symmetrically distributed on the main girder according to fixed interval, the main girder is also provided with several groups of lower lifting point connected with steel box girder temporary lifting point by steel wire rope, the lower lifting point is symmetrically distributed on the main girder according to fixed interval.
[0008] Further, the upper lifting points are located on the midline of two adjacent lower lifting points.
[0009] Further, the main beam is a single-box structure with rectangular cross section, and the upper lifting points are arranged above the single-box structure, and the lower lifting points are arranged below the single-box structure.
[0010] Still further, the single-box structure is provided with a cross beam above the single-box structure for arranging the upper lifting points.
[0011] Still further, the single-box structure is provided with a pair of connecting plates extending downward at the positions corresponding to the lower lifting points on both sides of the single-box structure, and the lower lifting points are provided with a pair of connecting lug plates connected with the connecting plates through bolts.
[0012] Still further, the single-box structure is provided with a reinforcing partition plate in the inner cavity.
[0013] Compared with the prior art, the utility model has the advantages of: ① the lifting appliance is designed with a plurality of upper and lower lifting points, which can meet the requirements of temporary lifting points of steel box girders with different sizes and different positions, and the lifting appliance has high versatility; ② the lifting appliance is reasonable in stress, effectively avoids the phenomenon of skewing and lifting, and is high in safety; ③ the upper and lower lifting points are reasonably arranged, so that the local bending moment of the lifting appliance is minimum; and ④ compared with the truss type lifting appliance, the utility model mainly converts most of the stress of the lifting appliance into axial pressure under the condition that the lifting capacity is not reduced, improves the carrying capacity of the lifting appliance, and in order to ensure the stability of the slender rod, a reasonable section form is designed, and the weight of the lifting appliance is lighter than that of the previous truss type lifting appliance. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is a schematic view of a main beam structure;
[0015] Figure 2 is a schematic view of a lower lifting point structure;
[0016] Figure 3 is a schematic view of a lifting condition. DETAILED DESCRIPTION
[0017] The embodiments of the utility model will be further described below with reference to the drawings.
[0018] The left half of the main beam 1 of the embodiment is shown as Figure 1 The main beam 1 is a single-box structure with rectangular cross section, and in order to ensure firmness, a partition plate 6 is arranged inside. The upper lifting points 2 are arranged on the main beam 1, and are distributed on the main beam 1 at fixed intervals. The lower lifting points 3 are arranged below the main beam 1, and are distributed on the main beam 1 at fixed intervals.
[0019] In the design of the size of the main beam 1, the sizes, weights and temporary lifting point positions of various bridge steel box girder structures in the construction in recent years are counted, combined with the lifting characteristics of the portal crane, a double main hook is used, and each frame of the lifting appliance is used to ensure that the length and the lower lifting point 3 position of the main beam 1 can cover more than 90% of the steel box girder structure lifting requirements.
[0020] In order to reduce the weight and structural size of the main beam 1, the embodiment does not use the traditional truss structure, but designs it as a single box structure with a rectangular cross section, and the length covers the temporary lifting point of the steel box girder. Considering the working condition of the portal crane using steel wire rope lifting, the lifting appliance is mainly subjected to horizontal axial force, followed by vertical bending, and then out-of-plane bending stress and deformation characteristics, 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 cross-sectional size is as small as possible, which can meet the out-of-plane bending, so as to improve the average stress of each upper lifting point 2 and lower lifting point 3.
[0021] The upper lifting point 2 is connected with the main hook of the portal crane through the steel wire rope, and considering that the additional bending moment generated by the transverse difference between the upper lifting point 2 and the lower lifting point 3 is as small as possible, the embodiment sets the upper lifting point 2 directly above the centers of the two lower lifting points 3.
[0022] As shown in Figure 2 , considering that the transverse slopes of various bridges are not equal and the height difference exists between various groups of temporary lifting points, the lower lifting point 3 of the embodiment is provided with a connecting lug plate 5, and a connecting plate 4 is correspondingly provided on the main beam 1, and an array of connecting holes is arranged in the connecting part of the two, and preferably 3×5 connecting holes. The elevation difference of the temporary lifting point of the steel box girder can be adapted by adjusting the bolted position of the connecting lug plate 5 and the connecting plate 4.
[0023] In the embodiment, in order to facilitate disassembly and assembly, the connection between the upper lifting point 2 and the lower lifting point 3 and the steel wire rope is pin shaft connection, and high-strength bolt connection can also be selected.
[0024] As shown in Figure 3 , during lifting construction, according to the position of the temporary lifting point of the steel box girder at that time, the position of the steel wire rope connected with the lower lifting point 3 is adjusted in time, so that the embodiment can be matched with the temporary lifting point group of the steel box girder, and the problem of inclined lifting existing in the fixed lifting point is effectively avoided.
Claims
1. A combined lifting point adaptive steel box girder lifting device, comprising a main beam (1), characterized in that, The main girder (1) is provided with a plurality of groups of upper lifting points (2) connected with the main hook of the crane through steel wire ropes, the upper lifting points (2) are symmetrically distributed on the main girder (1) at a fixed interval, the main girder (1) is further provided with a plurality of groups of lower lifting points (3) connected with the temporary lifting points of the steel box girder through steel wire ropes, and the lower lifting points (3) are symmetrically distributed on the main girder (1) at a fixed interval.
2. The combination lifting point adaptive steel box girder spreader according to claim 1, characterized in that, The upper lifting point (2) is located on the midline of two adjacent lower lifting points (3).
3. The combined lifting point adaptive steel box girder lifting appliance according to claim 1 or 2, characterized in that, The main girder (1) is a single-box structure with a rectangular cross section, the upper lifting point (2) is arranged above the single-box structure, and the lower lifting point (3) is arranged below the single-box structure.
4. The combined lifting point adaptive steel box girder hoist according to claim 3, characterized in that, The single-box structure is provided with a cross beam above the single-box structure for arranging the upper lifting point (2).
5. The combined lifting point adaptive steel box girder hoist according to claim 3, characterized in that, A pair of connecting plates (4) are extended downward at positions corresponding to the lower lifting points (3) on both sides of the single-box structure, the lower lifting point (3) is provided with a pair of connecting lug plates (5), and the connecting lug plates (5) are connected with the connecting plates (4) through bolts.
6. The combined lifting point adaptive steel box girder hoist according to claim 3, characterized in that, The single-box structure is provided with a reinforcing partition plate (6) in the inner cavity.