Lifting appliance for lifting bent ramp box girder

Abstract

The utility model provides a curved ramp box girder hoisting sling, which belongs to the technical field of box girder hoisting, and comprises a sling, a van type connecting seat and a clamping component, the sling comprises a cross-shaped fixing frame, four first steel cables are arranged at the top edge of the cross-shaped fixing frame and are connected with hoisting equipment, and the clamping component is arranged on the top edge of the cross-shaped fixing frame. Four second steel cables are arranged at the edge of the bottom of the cross-shaped fixing frame and connected with the top of the van type connecting base, a clamping assembly is arranged at the bottom of the van type connecting base and comprises an electric telescopic rod arranged in the van type connecting base, and clamping arms arranged on the two sides of the bottom of the van type connecting base; the electric telescopic rods are in transmission connection with the clamping arms, arc-shaped clamping blocks are arranged on the opposite sides of the two clamping arms, and the problems that when an existing hoisting clamping device clamps a bent box girder, the clamping faces of the existing hoisting clamping device cannot make close contact, the clamping force is insufficient, and the box girder is likely to shake in the hoisting process are solved.

Description

Technical Field

[0001] This utility model relates to the field of box girder hoisting technology, and more specifically, to a hoisting tool for curved ramp box girders. Background Technology

[0002] In the process of urbanization, elevated bridge systems have been widely used as an important means of alleviating traffic pressure. Among them, curved ramps, as an important component of elevated bridges, are particularly critical in the erection of their box girders. Curved ramp box girders are not only heavy but also complex in shape, which places higher demands on erection technology and equipment. The traditional method of box girder hoisting mainly involves clamping the box girder on both sides with clamping equipment. However, this method has obvious shortcomings when applied to curved ramp box girders. Due to the curvature of the curved box girder, the contact surface between the clamping equipment and the box girder often becomes point contact rather than ideal line contact or surface contact. This point contact method leads to insufficient clamping force, which can easily cause the box girder to sway during hoisting. This not only affects the erection efficiency but may also damage the box girder itself and surrounding facilities, making it difficult to ensure the stability and safety of the hoisting process. Therefore, it is necessary to develop a hoisting tool suitable for curved ramp box girders to improve the stability and safety of the hoisting process. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides a lifting tool for curved ramp box girders to solve the aforementioned problems.

[0004] This utility model is implemented as follows:

[0005] A lifting device for a curved ramp box girder includes a lifting device, a box-type connecting seat, and a clamping assembly. The lifting device includes a cross-shaped fixing frame. Four first steel cables are provided at the top edge of the cross-shaped fixing frame and connected to the lifting equipment. Four second steel cables are provided at the bottom edge of the cross-shaped fixing frame and connected to the top of the box-type connecting seat. A clamping assembly is provided at the bottom of the box-type connecting seat. The clamping assembly includes an electric telescopic rod disposed inside the box-type connecting seat and clamping arms disposed on both sides of the bottom of the box-type connecting seat. The electric telescopic rod is throttle-connected to the clamping arms. Arc-shaped clamping blocks are provided on opposite sides of the two clamping arms.

[0006] In an embodiment of this utility model, the box-type connecting seat includes a base plate, a shell is provided on the top of the base plate, the two sides of the shell are open, and hooks are provided at the four corners of the top of the shell. The four second steel cables on the lifting device are respectively connected to the hooks.

[0007] In an embodiment of this utility model, the clamping arm includes a connecting shaft, and downward lower arms are provided at both ends of the outer side of the connecting shaft. A clamping plate is provided on the inner side of the lower arms near the bottom. A second movable groove is provided in the middle of the inner side of the clamping plate. A plurality of arc-shaped clamping blocks are provided in the second movable groove. An upward rocker arm is provided in the middle of the outer side of the connecting shaft.

[0008] In an embodiment of this utility model, two sets of hinge seats are provided on the bottom of the base plate on both sides of the opening direction of the outer shell, the connecting shaft is hinged to the hinge seats, and a first movable groove for the rocker arm to move is provided on the top of the base plate.

[0009] In an embodiment of this utility model, there are two electric telescopic rods, which are fixedly installed on the top of the base plate. An L-shaped connecting rod is provided on the output shaft of the electric telescopic rod. A third movable groove is provided on the side of the rocker arm. One end of the L-shaped connecting rod passes through the third movable groove, and limit plates are respectively provided on both sides of the L-shaped connecting rod located on the outer side of the third movable groove.

[0010] In an embodiment of this utility model, the clamping surface of the arc-shaped clamping block is arc-shaped, and a hinge portion is provided in the middle of its opposite surface. The top of the clamping plate is provided with several mounting holes. The arc-shaped clamping block is placed in the second movable groove and the hinge portion is fixed to the mounting holes by a pin.

[0011] In an embodiment of this utility model, the arc-shaped clamping block has side grooves at both ends near the hinge portion, and rollers are movably disposed in the side grooves. The arc-shaped clamping block rotates along the hinge portion in the second movable groove, and the rollers abut against the side wall of the second movable groove.

[0012] In an embodiment of this utility model, a plurality of rubber strips are provided on the arc-shaped surface of the arc-shaped clamping block.

[0013] In an embodiment of this utility model, the roller is made of rubber.

[0014] The beneficial effects of this utility model are as follows: By adding movable arc-shaped clamping blocks to the clamping surface of the clamping arm, this lifting device can adapt its contact surface according to the curvature of the side of the steel box girder during clamping, increasing the contact area and ensuring the stability of the clamping. At the same time, the rollers and rubber strips on the arc-shaped clamping blocks further reduce friction and wear between the lifting device and the steel box girder, while increasing the friction force, making the clamping more secure. The design of the cross-fixing frame and the box-type connecting seat of the lifting device ensures that the center of gravity is located at the top of the lifting device during the lifting process, increasing the stability during the lifting process and reducing swaying and safety hazards. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A structural schematic diagram of a lifting device for a curved ramp box girder provided for an embodiment of this utility model;

[0017] Figure 2 A schematic diagram of the structure of the lifting device for clamping steel box girders provided for an embodiment of this utility model;

[0018] Figure 3 A schematic diagram of the clamping assembly provided in this embodiment of the utility model;

[0019] Figure 4 A schematic diagram of the arc-shaped clamping block provided for an embodiment of this utility model.

[0020] In the diagram: 10. Lifting device; 11. First steel cable; 12. Cross-shaped fixing frame; 13. Second steel cable; 20. Box-type connecting seat; 21. Base plate; 2101. First movable slot; 2102. Hinge seat; 22. Outer shell; 23. Hook; 30. Clamping assembly; 31. Electric telescopic rod; 3101. L-shaped connecting rod; 32. Clamping arm; 3201. Connecting shaft; 3202. Lower boom; 3203. Clamping plate; 3204. Second movable slot; 3205. Rocker arm; 33. Arc-shaped clamping block; 3301. Hinge part; 3302. Roller; 40. Steel box girder. Detailed Implementation

[0021] 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 scope of protection of this utility model.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, this utility model provides a lifting device for curved ramp box girder, including a lifting device 10, a box-type connecting seat 20, and a clamping assembly 30. The lifting device 10 includes a cross-shaped fixing frame 12, with four first steel cables 11 at the top edge of the cross-shaped fixing frame 12 connected to the lifting equipment, and four second steel cables 13 at the bottom edge of the cross-shaped fixing frame 12 connected to the top of the box-type connecting seat 20. The clamping assembly 30 is provided at the bottom of the box-type connecting seat 20. The clamping assembly 30 includes an electric telescopic rod 31 disposed inside the box-type connecting seat 20, and clamping arms 32 disposed on both sides of the bottom of the box-type connecting seat 20. The electric telescopic rod 31 is induced to the clamping arms 32. Arc-shaped clamping blocks 33 are provided on opposite sides of the two clamping arms 32. By adding movable arc-shaped clamping blocks 33 to the clamping surface of the clamping arms 32, this lifting device 10 can adapt its contact surface according to the curvature of the side of the steel box girder 40 during clamping, increasing the contact area and ensuring the stability of its clamping.

[0024] like Figure 2 As shown, the box-type connecting seat 20 includes a base plate 21, and a shell 22 is provided on the top of the base plate 21. The two sides of the shell 22 are open. Hooks 23 are provided at the four corners of the top of the shell 22. The four second steel cables 13 on the lifting device 10 are respectively connected to the hooks 23. The cross fixing frame 12 on the lifting device 10 and its connection with the box-type connecting seat 20 ensure that the center of gravity is located at the top of the lifting device 10 during the lifting process, thereby increasing the stability during the lifting process.

[0025] like Figure 2-3 As shown, the clamping arm 32 includes a connecting shaft 3201. The two outer ends of the connecting shaft 3201 are provided with downward lower arms 3202. The inner side of the lower arms 3202 near the bottom is provided with a clamping plate 3203. The inner middle of the clamping plate 3203 is provided with a second movable groove 3204. Several arc-shaped clamping blocks 33 are provided in the second movable groove 3204. The outer middle of the connecting shaft 3201 is provided with an upward rocker arm 3205.

[0026] Furthermore, the bottom of the base plate 21 is provided with two sets of hinge seats 2102 on both sides of the opening direction of the outer shell 22, and the connecting shaft 3201 is hinged on the hinge seats 2102. The top of the base plate 21 is provided with a first movable groove 2101 for the rocker arm 3205 to move.

[0027] It should be noted that the inner and outer sides described in this application refer to the relative directions of the two clamping arms 32 as inner and outer sides, respectively.

[0028] In this embodiment, there are two electric telescopic rods 31, which are fixedly installed on the top of the base plate 21. An L-shaped connecting rod 3101 is provided on the output shaft of the electric telescopic rod 31. A third movable groove is provided on the side of the rocker arm 3205. One end of the L-shaped connecting rod 3101 passes through the third movable groove. Limiting plates are provided on both sides of the L-shaped connecting rod 3101 on the outside of the third movable groove. The two limiting plates make the output shaft of the electric telescopic rod 31 and the rocker arm 3205 form a stable connecting rod structure.

[0029] like Figure 4 The clamping surface of the arc-shaped clamping block 33 is arc-shaped, and a hinge part 3301 is provided in the middle of its opposite surface. The top of the clamping plate 3203 is provided with several mounting holes. The arc-shaped clamping block 33 is placed in the second movable groove 3204 and the hinge part 3301 is fixed to the mounting hole by a pin.

[0030] In a preferred embodiment, the arc-shaped clamping block 33 has side grooves at both ends near the hinge portion 3301, and rollers 3302 are movably disposed in the side grooves. The arc-shaped clamping block 33 rotates along the hinge portion 3301 in the second movable groove 3204. The rollers 3302 abut against the side wall of the second movable groove 3204. The rollers 3302 can prevent the arc-shaped clamping block 33 from deforming due to long-term collision with the second movable groove 3204 during rotation, thereby increasing the friction between it and the inside of the second movable groove 3204 and affecting the clamping effect.

[0031] In this embodiment, several rubber strips are provided on the arc-shaped surface of the arc-shaped clamping block 33. The rubber strips can increase the contact area between the arc-shaped clamping block 33 and the steel box girder 40, and improve the stability during the hoisting process. At the same time, the roller 3302 is preferably made of rubber, which is also intended to ensure that the possibility of squeezing deformation is reduced when the arc-shaped clamping block 33 comes into contact with the second movable groove 3204.

[0032] It should be noted that, Figure 2 The shape of the steel box girder 40 is straight and is only used to show the clamping position of the clamping assembly 30. It does not represent the actual shape of the steel box girder 40 it clamps.

[0033] Specifically, the working principle of this type of lifting device for curved ramp box girders is as follows: Before lifting the steel box girder 40, the second steel cable 13 on the lifting device 10 is connected to the hook 23 on the top of the box-type connecting seat 20. Then, the lifting device 10 is moved above the steel box girder 40 by the lifting equipment. At this time, the clamping arms 32 of the clamping assembly 30 are positioned on both sides of the steel box girder 40. The electric telescopic rod 31 is extended, causing the rocker arm 3205 on the clamping arm 32 to rotate along the connecting shaft 3201, thereby causing the two clamping plates 3203 to rotate. When the arc-shaped clamping block 33 on the clamping plate 3203 contacts the contact surface of the steel box girder 40, it automatically adjusts its angle according to the curvature of its surface, thereby better fitting the side of the steel box girder 40 and increasing the clamping area. Through the above results, the problem of existing hoisting clamping equipment being unable to make tight contact with the clamping surface and having insufficient clamping force when clamping curved box girders is solved. This makes it easy for the box girder to sway during hoisting, which not only affects the erection efficiency but may also damage the box girder itself and surrounding facilities, making it difficult to ensure the stability and safety of the hoisting process.

[0034] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A lifting device for lifting box girders on curved ramps, characterized in that, The device includes a lifting device (10), a box-type connecting seat (20), and a clamping assembly (30). The lifting device (10) includes a cross-shaped fixing frame (12). Four first steel cables (11) are provided at the top edge of the cross-shaped fixing frame (12) and connected to the lifting equipment. Four second steel cables (13) are provided at the bottom edge of the cross-shaped fixing frame (12) and connected to the top of the box-type connecting seat (20). The bottom of the box-type connecting seat (20) is provided with a clamping assembly (30). The clamping assembly (30) includes an electric telescopic rod (31) provided inside the box-type connecting seat (20) and clamping arms (32) provided on both sides of the bottom of the box-type connecting seat (20). The electric telescopic rod (31) is connected to the clamping arms (32) in a transmission connection. Arc-shaped clamping blocks (33) are provided on the opposite sides of the two clamping arms (32).

2. The lifting device for a curved ramp box girder according to claim 1, characterized in that, The box-type connecting seat (20) includes a base plate (21), and a shell (22) is provided on the top of the base plate (21). The shell (22) has openings on both sides, and hooks (23) are provided at the four corners of the top of the shell (22). The four second steel cables (13) on the lifting device (10) are respectively connected to the hooks (23).

3. The lifting device for a curved ramp box girder according to claim 2, characterized in that, The clamping arm (32) includes a connecting shaft (3201). The two outer ends of the connecting shaft (3201) are provided with downward lower arms (3202). The inner side of the lower arms (3202) near the bottom is provided with a clamping plate (3203). The middle inner side of the clamping plate (3203) is provided with a second movable groove (3204). A plurality of arc-shaped clamping blocks (33) are provided in the second movable groove (3204). The middle outer side of the connecting shaft (3201) is provided with an upward rocker arm (3205).

4. The lifting device for a curved ramp box girder according to claim 3, characterized in that, The bottom of the base plate (21) is provided with two sets of hinge seats (2102) on both sides of the opening direction of the outer shell (22). The connecting shaft (3201) is hinged on the hinge seats (2102). The top of the base plate (21) is provided with a first movable groove (2101) for the rocker arm (3205) to move.

5. The lifting device for a curved ramp box girder according to claim 4, characterized in that, There are two electric telescopic rods (31), which are fixedly installed on the top of the base plate (21). An L-shaped connecting rod (3101) is provided on the output shaft of the electric telescopic rod (31). A third movable groove is provided on the side of the rocker arm (3205). One end of the L-shaped connecting rod (3101) passes through the third movable groove, and limit plates are respectively provided on both sides of the L-shaped connecting rod (3101) located on the outside of the third movable groove.

6. The lifting device for a curved ramp box girder according to claim 5, characterized in that, The clamping surface of the arc-shaped clamping block (33) is arc-shaped, and a hinge part (3301) is provided in the middle of its opposite surface. The top of the clamping plate (3203) is provided with several mounting holes. The arc-shaped clamping block (33) is placed in the second movable groove (3204) and the hinge part (3301) is fixed to the mounting hole by a pin.

7. The lifting device for a curved ramp box girder according to claim 6, characterized in that, The arc-shaped clamp (33) has side grooves at both ends near the hinge (3301), and a roller (3302) is movably disposed in the side groove. The arc-shaped clamp (33) rotates along the hinge (3301) in the second movable groove (3204), and the roller (3302) abuts against the side wall of the second movable groove (3204).

8. The lifting device for a curved ramp box girder according to claim 7, characterized in that, The arc-shaped clamp (33) has several rubber strips on its arc-shaped surface.

9. The lifting device for a curved ramp box girder according to claim 7, characterized in that, The roller (3302) is made of rubber.

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