Lifting claw for super-heavy steel box girders

Abstract

A lifting claw for super-heavy steel box girders, comprising: a lifting claw part (1) and a plurality of groups of suspension eye holders (6) arranged along the lower edge of the lifting claw part (1); characterized in that - suspension slide rods (7) are arranged symmetrically on the underside of the lifting claw part (1), wherein adjustment plates (8) are slidably attached to the outside of the suspension slide rod, and a load-bearing section (10) for receiving counterweights is arranged between the adjustment plates (8); - wherein at one end of the load-bearing section (10) several groups of locking bars (11) are arranged so as to slide up and down, and the locking bars (11) are guided through the load-bearing section (10), wherein stop bars (12) are arranged at both ends of the locking bars (11), return springs (13) are placed on the outside of the locking bars (11) on both sides, a clamping plate (14) is arranged at the other end of the load-bearing section (10), a telescopic plate (15) is arranged so as to slide inside the clamping plate (14), and support springs (16) for supporting the telescopic plate (15) are arranged inside the clamping plate (14).

Description

Technical area

[0001] The present utility model relates to the technical field of lifting claws, in particular it relates to a lifting claw for super-heavy steel box girders. State of the art

[0002] Steel box girders, also known as steel plate box girders, are a commonly used structural element for long-span bridges and are generally used for bridges with longer spans. Due to their box-like exterior, they are referred to as steel box girders. When handling and installing steel box girders, workers typically use large lifting devices equipped with lifting claws that match the specifications of the steel box girders to lift the steel box girders.

[0003] Most conventional lifting claws for steel box girders have relatively simple functions and can only be used to secure the steel box girders. However, due to the uneven mass distribution of some steel box girders, they tend to develop lateral imbalance during the lifting process. The usual approach is to adjust the suspension cables to bring both ends of the steel box girder into alignment. This procedure is time-consuming and labor-intensive, and poses significant difficulties for bridge construction. Contents of this utility model

[0004] The object of the present utility model is to provide a lifting claw for super-heavy steel box girders to solve the technical problem that most existing lifting claws for steel box girders have relatively simple functions in use and do not allow balance adjustment.

[0005] The technical problem to be solved by the present utility model can be realized by the following technical solution: A lifting claw for super heavy steel box girders, comprising a lifting claw part and a plurality of groups of suspension eye holders arranged along the lower edge of the lifting claw part (1); - suspension slide rods are arranged symmetrically on the underside of the lifting claw part, with adjustment plates being slidably attached to the outside of the suspension slide rod, and a load-bearing section for receiving counterweights being arranged between the adjustment plates; - wherein at one end of the load-bearing section, several groups of locking bars are arranged to slide up and down, and the locking bars are guided through the load-bearing section, wherein stop bars are arranged at both ends of the locking bars, return springs are mounted on the outside of the locking bars on both sides, a clamping plate is arranged at the other end of the load-bearing section, a telescopic plate is arranged to slide inside the clamping plate, and support springs for supporting the telescopic plate are arranged inside the clamping plate.

[0006] As a further embodiment of the present utility model, the lifting claw part has the shape of an isosceles trapezoid, wherein a handle is arranged on the lowest stop bar and the return springs are positioned between the load-bearing section and the uppermost stop bar.

[0007] As a further embodiment of the present utility model, a fine adjustment hydraulic cylinder is arranged in the central region of the upper side of the lifting claw part, wherein a joint part is provided movably at the upper end of the fine adjustment hydraulic cylinder.

[0008] As a further embodiment of the present utility model, a fixed end piece is movably arranged at the upper end of the joint part, wherein several groups of fastening holes are formed in the fixed end piece.

[0009] As a further embodiment of the present utility model, a compensating hydraulic cylinder is movably arranged on the upper side of the lifting claw part, and the other end of the compensating hydraulic cylinder is movably connected to the fixed end piece, wherein the adjusting plate is fixedly connected to the suspension push rod by means of positioning bolts.

[0010] As a further embodiment of the present utility model, both the telescopic plate and the top of the top stop bar are provided with rollers, and when the adjusting plate slides on one end of the lifting claw part, a group of the rollers comes into contact with the bottom wall of the lifting claw part.

[0011] Advantageous effects of the present utility model: In the present utility model, during steel box girder lifting operations, workers can adjust the position of the adjustment plate and the load-bearing section by placing counterweights on the load-bearing section. This allows the weight ratio at both ends to be changed when the steel box girders are lifted by the device, achieving a good balancing effect. The device's function is further expanded, flexibility increased, and variable lifting situations met, providing great convenience for bridge construction work.In addition, the return springs and support springs arranged at both ends of the load-bearing section can respectively form elastic support for the locking beam and the telescopic plate, which facilitates the pulling and placing of the counterweights and at the same time forms a position limit for the counterweights on the load-bearing section to prevent the counterweights from moving or slipping during the lifting process and thereby causing imbalance. Brief description of the characters

[0012] The present utility model is explained in more detail below with reference to the attached figures. Fig. Figure 1 is an overall perspective view of the device according to the present utility model; Fig. 2 is a perspective view of the locking bar according to the present utility model; Fig. 3 is a perspective view of the telescopic plate according to the present utility model; Fig. 4 is a schematic structural diagram of the support spring according to the present utility model. Detailed embodiments

[0013] The technical solutions of the embodiments of the present utility model are described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments represent only a portion of the embodiments of the present utility model and not all of them. Based on the embodiments of the present utility model, all other embodiments that can be obtained by those skilled in the art without inventive activity fall within the scope of the present utility model.

[0014] As in the Fig.As shown in Figures 1-4, a lifting claw for super-heavy steel box girders comprises a lifting claw part 1 and several groups of suspension eye holders 6 arranged at the bottom edge of the lifting claw part 1. The lifting claw part 1 forms the main structure of the device and ensures the overall stability and strength of the device during use. The arranged suspension eye holders 6 connect and secure the device to the steel box girder, thereby ensuring the stability of the steel box girder during the lifting process.

[0015] At the bottom of the lifting claw part 1, suspension slide rods 7 are arranged symmetrically, with adjustment plates 8 slidably attached to their outer sides. The adjustment plates 8 are fixed to the suspension slide rods 7 by positioning bolts 9. A load-bearing section 10 for receiving counterweights is arranged between the adjustment plates 8, with several groups of locking beams 11 arranged at one end of the load-bearing section 10, which slide up and down and penetrate the load-bearing section 10. Stop bars 12 are arranged at both ends of the locking beams 11, and return springs 13 are attached to the outer sides of the locking beams 11 on both sides. At the other end of the load-bearing section 10, a clamping plate 14 is arranged, inside which a telescopic plate 15 is slidably arranged. Support springs 16 for supporting the telescopic plate 15 are arranged inside the clamping plate 14.After the steel box girder has been secured and lifted, workers can remove the positioning bolts 9 and release the locking between the adjustment plates 8 and the suspension push rods 7. At this time, the positions of the adjustment plates 8 and the load-bearing section 10 can be adjusted, and counterweights can be placed on the load-bearing section 10. This allows the weight ratio at both ends of the device to be changed when lifting the steel box girder, achieving a good balancing effect. The device's functionality is further expanded, flexibility increased, and the lifting requirements changed, greatly facilitating bridge construction. The return springs 13 and support springs 16 arranged at both ends of the load-bearing section 10 can elastically support the locking beams 11 and the telescopic plate 15, respectively.The locking beams 11 and the telescopic plate 15 allow the counterweights to be positioned on the load-bearing section 10, preventing movement or slippage of the counterweights during the lifting process, which could lead to imbalance. The elastically supported locking beams 11 and telescopic plates 15 can perform up-and-down movements, preventing the upper surfaces of the adjustment plates 8 from colliding with the lifting claw part 1 during left-right sliding movements, ensuring smooth adjustment of the adjustment plates 8.

[0016] In this embodiment, the lifting claw part 1 has in particular the shape of an isosceles trapezoid, wherein a handle is arranged on the lowermost stop bar 12 and the return spring 13 is positioned between the load-bearing section 10 and the uppermost stop bar 12.

[0017] In this exemplary embodiment, a fine-adjustment hydraulic cylinder 2 is arranged in particular in the central region of the upper part of the lifting claw part 1, wherein a joint part 3 is movably provided at the upper end of the fine-adjustment hydraulic cylinder 2, a fixed end piece 4 is movably arranged at the upper end of the joint part 3, and several groups of fastening holes are formed in the fixed end piece 4, a compensating hydraulic cylinder 5 is movably provided on the upper side of the lifting claw part 1, and the other end of the compensating hydraulic cylinder 5 is movably connected to the fixed end piece 4, wherein, during lifting and joining of the steel box girders, a precise height adjustment of the steel box girders can be carried out by the provided fine-adjustment hydraulic cylinder 2, and a precise adjustment of the height difference between the two ends of the steel box girders can also be carried out by the extension movement of the provided compensating hydraulic cylinder 5.This allows for fine adjustment of the height and angle of the steel box girders during the joining process, which makes the assembly of the steel box girders much easier.

[0018] In this embodiment, in particular, both the telescopic plate 15 and the upper surface of the uppermost stop bar 12 are provided with rollers 17, wherein when the adjustment plate 8 slides at one end of the lifting claw part 1, a group of rollers 17 comes into contact with the bottom wall of the lifting claw part 1. During the leveling process, when the counterweight is adjusted to one end of the lifting claw part 1, due to the isosceles-trapezoidal shape of the lifting claw part 1, the rollers 17 come into contact with the bottom wall of the lifting claw part 1, thereby converting the sliding friction into rolling friction and thus ensuring the smooth up and down movement of the locking bar 11 and the telescopic plate 15.

[0019] While an embodiment of the present utility model has been described in detail above, the described content merely represents a preferred embodiment of the present utility model and cannot be considered as limiting the scope of protection of the present utility model. All equivalent modifications and improvements made within the scope of protection of the present utility model shall continue to be within the scope of patent protection of the present utility model. Reference symbol 1 lifting claw part; 2 fine adjustment hydraulic cylinders; 3 joint part; 4 fixed end piece; 5 compensating hydraulic cylinders; 6 hanging eyelet holders; 7 Suspension push bar; 8 adjustment plate; 9 positioning bolts; 10 load-bearing section; 11 locking bars; 12 stop bar; 13 return spring; 14 clamping plate; 15 telescopic plate; 16 support spring; 17 roller.

Claims

[1] A lifting claw for super heavy steel box girders, comprising: a lifting claw part (1) and a plurality of groups of suspension eye holders (6) arranged along the lower edge of the lifting claw part (1); characterized by , that - suspension slide rods (7) are arranged symmetrically on the underside of the lifting claw part (1), wherein adjustment plates (8) are slidably attached to the outside of the suspension slide rod, and a load-bearing section (10) for receiving counterweights is arranged between the adjustment plates (8); - wherein at one end of the load-bearing section (10) several groups of locking bars (11) are arranged so as to slide up and down, and the locking bars (11) are guided through the load-bearing section (10), wherein stop bars (12) are arranged at both ends of the locking bars (11), return springs (13) are placed on the outside of the locking bars (11) on both sides, a clamping plate (14) is arranged at the other end of the load-bearing section (10), a telescopic plate (15) is arranged so as to slide inside the clamping plate (14), and support springs (16) for supporting the telescopic plate (15) are arranged inside the clamping plate (14). [2] Lifting claw for super-heavy steel box girders according to claim 1, characterized bythat the lifting claw part (1) has the shape of an isosceles trapezoid, wherein a handle is arranged on the lowermost stop bar (12) and the return springs (13) are positioned between the load-bearing section (10) and the uppermost stop bar (12). [3] Lifting claw for super-heavy steel box girders according to claim 1, characterized by that a fine adjustment hydraulic cylinder (2) is arranged in the central region of the upper side of the lifting claw part (1), wherein a joint part (3) is provided movably at the upper end of the fine adjustment hydraulic cylinder (2). [4] Lifting claw for super-heavy steel box girders according to claim 1, characterized by that a fixed end piece (4) is movably arranged at the upper end of the joint part (3), and several groups of fastening holes are formed in the fixed end piece (4). [5] Lifting claw for super-heavy steel box girders according to claim 1, characterized bythat a compensating hydraulic cylinder (5) is movably arranged on the upper side of the lifting claw part (1), and the other end of the compensating hydraulic cylinder (5) is movably connected to the fixed end piece (4), wherein the adjusting plate (8) is fixedly connected to the suspension push rod (7) by means of positioning bolts (9). [6] Lifting claw for super-heavy steel box girders according to claim 1, characterized by that both the telescopic plate (15) and the upper side of the uppermost stop bar (12) are provided with rollers (17), and when the adjusting plate (8) slides on one end of the lifting claw part (1), a group of the rollers (17) comes into contact with the bottom wall of the lifting claw part (1).

Images