A prefabricated box girder hoist for railway

Abstract

The utility model discloses a prefabricated box girder hoist for railway, including upper part compression girder, middle part cold cast anchor and lower part joist from top to bottom are connected in proper order. Upper part compression girder is connected by detachable structure with the long side beam of the middle part of short side beam beam both ends, it is provided with the sling in its inside, and the middle part cold cast anchor is rigidly connected below short side beam respectively, and the upper end is connected with upper part compression girder, and the lower end passes through the both ends of lower part joist and is fixed, and the three constitute integrated hoisting structure. The hoist structure is stable, and the assembly is convenient, and it is convenient for transportation and on -the -spot installation, and effectively promotes the safety and operation efficiency of prefabricated box girder hoisting.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a lifting device for transporting precast box girders for railways. Background Technology

[0002] In railway construction, the lifting and hoisting of large-span, heavy-tonnage precast box girders is a critical construction phase. Traditional lifting equipment often employs rigid connection structures with fixed lifting points and a single force path. During actual hoisting, this easily leads to localized stress concentration in the girder, causing concrete cracking or damage to the prestressed system, severely impacting structural durability and service safety. Furthermore, existing lifting equipment generally lacks dynamic balance adjustment capabilities, making it difficult to effectively handle complex conditions such as eccentric loading and wind loads. Especially in complex terrains and harsh environments such as mountainous areas, canyons, or coastal regions, hoisting stability is poor, and the risk of swaying is high, posing significant safety hazards. In addition, traditional equipment also has significant shortcomings at the operational level: the slings are prone to lateral slippage, and the difficulty in moving the support beam under the girder makes disassembly and assembly of the cold-cast anchor and support beam difficult, reducing work efficiency and increasing the risks of manual operation. Summary of the Invention

[0003] This utility model provides a lifting device for transporting precast box girders for railways, in order to overcome the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A lifting device for transporting precast box girders for railways includes an upper pressure beam, a middle cold-cast anchor, and a lower support beam connected sequentially from top to bottom. The upper pressure beam includes two short side beams located at both ends and a long side beam connected between the two short side beams. The short side beams and the long side beams are connected by a detachable structure. The central cold-cast anchor is rigidly connected to the lower part of the short side beam and has a lifting cable inside. The upper end of the central cold-cast anchor passes through the short side beam and connects to the upper pressure beam, while the lower end passes through both ends of the lower support beam and connects to it, thereby integrating the upper pressure beam, the central cold-cast anchor and the lower support beam into a single hoisting structure.

[0005] Furthermore, the detachable structure is a connecting beam; the connecting beam is provided with several flanges.

[0006] Furthermore, a first anti-detachment shaft body is provided at the connection between the upper end of the middle cold-cast anchor and the short side beam; a second anti-detachment shaft body is provided at the connection between the lower end of the middle cold-cast anchor and the lower support beam.

[0007] Furthermore, a lifting lug is provided below the second anti-detachment shaft body.

[0008] Furthermore, a lifting device assembly is provided on the short side beam near the first anti-detachment shaft body.

[0009] Furthermore, a lifting assembly is provided at the upper end of the long side beam.

[0010] Furthermore, the upper end of the lower support beam is provided with a rubber pad, movable stops are symmetrically arranged on both sides of the upper end, and lifting rings are symmetrically arranged at both ends; the lower end of the lower support beam is provided with a reinforcing pad and a wheel assembly.

[0011] Beneficial Effects: The precast box girder lifting device for railways provided by this utility model connects the upper pressure beam, the middle cold-cast anchor, and the lower support beam from top to bottom to form an integrated and synergistic lifting structure. This effectively solves the problems of stress concentration, beam damage, and insufficient stability that traditional lifting devices easily cause during the lifting of large-tonnage box girders. The upper pressure beam is composed of short side beams at both ends and a long side beam in the middle, connected by a detachable structure. This not only forms a rigid and stable frame system but also facilitates rapid on-site assembly, disassembly, and transportation. The middle cold-cast anchor is located on the short side beams and integrates high-strength slings. Its upper end passes through the short side beams and is reliably connected to the upper pressure beam, while its lower end passes through both ends of the lower support beam and is fixed thereto. This ensures that the entire lifting device achieves uniform force transmission when bearing huge lifting loads, significantly reducing local stress peaks and preventing cracking or damage to the precast box girder due to uneven stress. This structural design not only enhances the overall resistance to eccentric loads and wind loads of the lifting device, improving lifting stability under complex working conditions, but also greatly facilitates the entry and exit of the lifting beam from the bottom of the box girder and the disassembly of the cold-cast anchors through auxiliary structures such as wheels, lifting rings, and lifting lugs configured on the lower support beam. This reduces the labor intensity of workers and improves operational safety and construction efficiency. Overall, this lifting device combines structural reliability, ease of operation, and environmental adaptability, making it particularly suitable for the safe and efficient transport of large-span, heavy-tonnage precast box girders in railway engineering projects with complex terrain and harsh conditions. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of a lifting device for transporting precast box girders for railways. Figure 2 A schematic diagram of the structure in its working state provided by this utility model; Figure 3 A schematic diagram of the upper pressure beam structure provided by this utility model; Figure 4A schematic diagram of the lower support beam structure provided by this utility model.

[0014] In the diagram: 1. Upper pressure beam; 11. Pulley pin seat and lifting shaft; 12. Connecting beam; 13. Lifting device; 14. Flange; 15. First anti-reverse plate; 16. Short side beam; 2. Middle cold-cast anchor; 21. First anti-detachment shaft body; 22. Lifting lug; 23. Second anti-detachment shaft body; 24. Lifting sling; 3. Lower support beam; 31. Rubber pad; 32. Movable stop block; 33. Wheel assembly; 34. Lifting ring; 35. Second anti-reverse plate; 36. Pin; 37. Reinforcing pad. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] This embodiment provides a lifting device for transporting precast box girders for railways, such as... Figures 1 to 4 It includes an upper pressure beam 1, a middle cold-cast anchor 2 and a lower support beam 3 connected sequentially from top to bottom; The upper pressure beam 1 includes two short side beams 16 located at both ends and a long side beam connected between the two short side beams 16. The short side beams 16 and the long side beam are connected by a detachable structure to form a load-bearing frame. The central cold-cast anchor 2 is rigidly connected to the lower part of the short side beam 16, and has a lifting cable 24 inside. The lifting cable 24 is preferably made of steel cable, and the outer layer of the steel cable is covered with a PVC protective pipe. The upper end of the central cold-cast anchor 2 passes through the short side beam 16 and connects to the upper pressure beam 1, and the lower end passes through both ends of the lower support beam 3 and connects to it, thereby integrating the upper pressure beam 1, the central cold-cast anchor 2 and the lower support beam 3 into an integrated hoisting structure. This integrated structure not only effectively transmits the hoisting load, but also improves the overall rigidity and stability, while taking into account modular installation and uniform stress distribution, avoiding stress concentration that could damage the beam and affect the structural durability.

[0017] Furthermore, the detachable structure is a connecting beam 12; the connecting beam 12 is provided with several flanges 14. The long side beams and short side beams 16 are connected by the connecting beam 12 and flanges 14 to form a stable frame structure, which significantly improves the convenience of assembly and disassembly while ensuring the overall structural rigidity and load-bearing capacity. The flange connection method facilitates on-site installation, adjustment, and subsequent maintenance and replacement, while the connecting beam 12 effectively transfers and distributes the load, enhancing the overall stability and deformation resistance of the frame, thereby improving the reliability and service life of the entire hoisting structure.

[0018] Furthermore, a first anti-detachment shaft body 21 is provided at the connection between the upper end of the central cold-cast anchor 2 and the short side beam 16; a second anti-detachment shaft body 23 is provided at the connection between the lower end of the central cold-cast anchor 2 and the lower support beam 3. This effectively prevents the central cold-cast anchor 2 from axially slipping or detaching during the stress process, significantly improving the reliability and safety of the connection. The anti-detachment shaft body not only enhances the overall stability of the structure but also avoids the risk of loosening caused by vibration or load fluctuations, thereby ensuring the robustness and durability of the hoisting system during long-term operation. In addition, a first anti-reverse plate 15 is provided on the side of the upper pressure beam 1 near the first anti-reverse shaft body 21, and a second anti-reverse plate 35 is provided on the side of the lower support beam 3 near the second anti-reverse shaft body 23; a pin 36 is provided at the upper end of the lower support beam 3 near the middle cold-cast anchor 2. The pin 36 and the second anti-reverse plate 35 together constitute a limiting component to limit the lateral displacement of the middle cold-cast anchor 2, thereby preventing the internal sling 24 from abnormal wear or stress due to sway.

[0019] Furthermore, a lifting lug 22 is provided below the second anti-detachment shaft body 23, which facilitates the forklift to pull the cold-cast anchor out of the support beam, significantly improving the ease of operation and work efficiency.

[0020] Furthermore, a lifting tool assembly is provided on the short side beam 16 near the first anti-detachment shaft body 21. A quick and reliable connection with the beam lifting machine's lifting tool is achieved through the movable pulley pin seat and the lifting shaft 11, which not only improves the stability and safety of the lifting process but also simplifies on-site docking operations, improving overall lifting efficiency and construction convenience.

[0021] Furthermore, a lifting device 13 is provided at the upper end of the long side beam, which facilitates the hoisting and positioning of the overall structure. This not only improves the flexibility of installation and transportation, but also effectively disperses the hoisting load, enhances the uniformity of structural stress, and further ensures construction safety and efficiency.

[0022] Furthermore, the upper end of the lower support beam 3 is provided with a rubber pad 31, and movable stops 32 are symmetrically arranged on both sides of the upper end, with lifting rings 34 symmetrically arranged at both ends; the lower end of the lower support beam 3 is provided with a reinforcing pad 37 and a wheel assembly 33. This design, with the rubber pad 31 at the upper end of the lower support beam 3, effectively buffers and absorbs vibration and impact during operation, protecting the structure and the components it supports; the movable stops 32 arranged symmetrically on both sides can flexibly adapt to the limiting requirements under different working conditions, improving positioning stability; the lifting rings 34 at both ends facilitate multi-point hoisting or transfer operations, enhancing construction flexibility. The reinforcing pad 37 at the lower end improves the local load-bearing capacity, and together with the wheel assembly 33, enables convenient movement of the overall structure, significantly improving on-site operation efficiency and safety.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lifting device for transporting precast box girders for railways, characterized in that: It includes an upper pressure beam (1), a middle cold-cast anchor (2), and a lower support beam (3) connected from top to bottom. The upper pressure beam (1) includes two short side beams (16) located at both ends and a long side beam connected between the two short side beams (16). The short side beams (16) and the long side beam are connected by a detachable structure to form a load-bearing frame. The central cold-cast anchor (2) is rigidly connected to the short side beam (16) and has a sling (24) inside. The upper end of the central cold-cast anchor (2) passes through the short side beam (16) and is connected to the upper pressure beam (1), while the lower end passes through both ends of the lower support beam (3) and is connected to it, thereby integrating the upper pressure beam (1), the central cold-cast anchor (2) and the lower support beam (3) into an integrated hoisting structure.

2. The lifting device for transporting precast box girders for railways according to claim 1, characterized in that: The detachable structure is a connecting beam (12); the connecting beam (12) is provided with a number of flanges (14).

3. The lifting device for transporting precast box girders for railways according to claim 1, characterized in that: A first anti-detachment shaft body (21) is provided at the connection between the upper end of the middle cold-cast anchor (2) and the short side beam; a second anti-detachment shaft body (23) is provided at the connection between the lower end of the middle cold-cast anchor (2) and the lower support beam (3).

4. A lifting device for transporting precast box girders for railways according to claim 3, characterized in that: A lifting lug (22) is provided below the second anti-detachment shaft body (23).

5. A lifting device for transporting precast box girders for railways according to claim 1, characterized in that: A lifting device assembly is provided on the short side beam (16) near the first anti-detachment shaft body (21).

6. A lifting device for transporting precast box girders for railways according to claim 1, characterized in that: A lifting device (13) is provided at the upper end of the long side beam.

7. A lifting device for transporting precast box girders for railways according to claim 1, characterized in that: The lower support beam (3) is provided with a rubber pad (31) at the upper end, movable stops (32) are symmetrically arranged on both sides of the upper end, and lifting rings (34) are symmetrically arranged at both ends; the lower end of the lower support beam (3) is provided with a reinforcing pad (37) and a wheel assembly (33).

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