Special lifting appliance for gravity-center-adjustable variable-cross-section steel box girder

Abstract

The utility model provides a special lifting appliance for a gravity-center-adjustable variable-cross-section steel box girder. The special lifting appliance comprises an adjustable component, a main bearing component and an adjustable locking device, the adjustable component comprises a movable frame, an adjustable nesting component and a roller assembly; the adjustable nesting component is nested on the main bearing component, and the movable frame is fixedly connected with the adjustable nesting component; the roller assembly is arranged in the adjustable nesting component, and the adjustable nesting component is in sliding connection with the main bearing component through the roller assembly; the adjustable locking device is detachably installed on the adjustable component and the main bearing component and used for locking the adjustable component and the main bearing component after the gravity center is adjusted. The position of the adjustable nesting component can be adjusted through relative sliding of the roller assembly and the main bearing component, then the gravity center of the steel box girder body is kept consistent with the position of a hoisting point, after adjustment is completed, the adjustable component and the main bearing component are fixed through the adjustable locking device to ensure that the gravity center is stable in the hoisting process, adjustment is flexible and convenient, and the hoisting efficiency is improved. The operability is high.

Description

Technical Field:

[0001] The utility model belongs to the technical field of hoisting of variable cross-section steel box girders for large components in bridge engineering, and particularly relates to a special hoisting tool for variable cross-section steel box girders with adjustable center of gravity. Background Art:

[0002] During the construction of the superstructure of bridge engineering, steel box girders are generally prefabricated in a prefabrication yard first, then transported to the construction site by transportation machinery, and then hoisted onto the pre-installed bearings by hoisting machinery. However, in the actual construction process, variable cross-section steel girders often have the characteristics of multiple spans, multiple weight types, and multiple span types, which makes the center of gravity of the steel box girder and the position of the lifting points inconsistent during the loading, unloading, and installation processes, resulting in uncertain risks during the hoisting process. In view of this, there is an urgent need for a standardized and adjustable lifting center variable cross-section steel box girder hoisting equipment. Based on the above content, the utility model provides a special hoisting tool for variable cross-section steel box girders with adjustable center of gravity to solve the above problems. Summary of the Invention:

[0003] The purpose of the utility model is to provide a special hoisting tool for variable cross-section steel box girders with adjustable center of gravity to solve the problem of inconsistent center of gravity and lifting point position of the steel box girder in view of the problems existing in the prior art.

[0004] The utility model adopts the following technical solutions:

[0005] The utility model provides a special hoisting tool for variable cross-section steel box girders with adjustable center of gravity, which includes an adjustable component, a main load-bearing component, and an adjustable locking device; the adjustable component includes a moving frame, an adjustable nested component, and a roller assembly; the adjustable nested component is nested on the main load-bearing component, and the moving frame is fixedly connected with the adjustable nested component; the roller assembly is arranged inside the adjustable nested component, and the adjustable nested component is slidably connected with the main load-bearing component through the roller assembly; the adjustable locking device is detachably installed on the adjustable component and the main load-bearing component for locking the adjustable component and the main load-bearing component after adjusting the center of gravity.

[0006] Further, the main load-bearing component includes a lifting beam, a connecting beam, and a distribution beam; there are two groups of lifting beams, and the two groups of lifting beams are arranged in parallel; there are several groups of connecting beams, which are fixedly arranged between the two groups of lifting beams; there are several groups of distribution beams, which are arranged above the lifting beams and fixedly connected with the two groups of lifting beams; the adjustable nested component is slidably connected with the lifting beam through the roller assembly.

[0007] Further, there are four groups of adjustable nested components, which are respectively fixedly connected with the moving frame; the cross-section of the adjustable nested component is The structure includes a base plate and two side plates, and the two side plates are symmetrically and fixedly arranged on both sides of the base plate; the roller assembly includes a bearing and a roller, and is installed on the inner surface of the base plate; the balance beam is nested inside the adjustable nesting member and is slidably connected to the roller.

[0008] Furthermore, a hanging ear is arranged on the upper surface of the base plate of the adjustable nesting member.

[0009] Furthermore, the adjustable locking device includes two groups of screw fixing parts; fixing blocks are respectively arranged on the inner sides of the two side plates of the adjustable nesting member, the two groups of fixing blocks are symmetrically arranged, and through holes are formed in the fixing blocks; the two groups of screw fixing parts are respectively arranged at the two fixing blocks; the screw fixing part includes a screw and a nut; the screw passes through the through hole of the fixing block and is fixedly connected to the balance beam through the nut.

[0010] Furthermore, an installation block is arranged below the balance beam, and a through hole adapted to the screw is arranged on the installation block; the screw passes through the through holes of the fixing block and the installation block at the same time and is fixed by screwing the nut.

[0011] Furthermore, the moving frame is in a rectangular frame structure, and four groups of adjustable nesting members are fixedly installed at the four corners of the moving frame.

[0012] Furthermore, the balance beam is made of H-shaped steel and presents an "I"-shaped structure; steel plates or angle steels are welded on both sides of the balance beam to increase the strength of the balance beam; the connecting beam includes a steel pipe and a steel plate, the steel plates are welded at both ends of the steel pipe, and the steel plates are fixedly connected to the balance beam through bolts and nuts; the distribution beam is arranged in parallel with the connecting beam and includes H-shaped steel and a lower connecting member, the top of the lower connecting member is fixedly connected to the bottom of the H-shaped steel, and the bottom of the lower connecting member is fixedly connected to the balance beam.

[0013] Furthermore, a number of lower hanging ears are fixedly installed on the distribution beam, the lower hanging ears are welded at the bottom end of the H-shaped steel of the distribution beam, and the lower hanging ears are distributed outside the lower connecting member.

[0014] The beneficial effects of the present utility model:

[0015] (1) The present utility model can adjust the position of the adjustable nesting member by the relative sliding of the roller assembly and the main load-bearing member, so as to make the center of gravity of the steel box girder coincide with the position of the suspension point. After the adjustment is completed, the adjustable member and the main load-bearing member are fixed through the adjustable locking device; when adjustment is required again, screw the nuts of each group to move them away from the fixing block / installation block, and then adjust the position of the adjustable nesting member. After the adjustment is completed, lock and fix it again through the adjustable locking device, which can ensure the stability of the center of gravity during the hoisting process and is flexible and convenient to adjust;

[0016] (2) The utility model is reasonably designed, with a simple structure, strong stress resistance and strong practicability. It is a special lifting tool with standardization, strong operability and applicable to the hoisting of variable-section steel box girders. Description of the drawings:

[0017] Figure 1 It is the front view provided by the embodiment of the present application;

[0018] Figure 2 It is the top view provided by the embodiment of the present application;

[0019] Figure 3 It is the side view of the adjustable component provided by the embodiment of the present application;

[0020] Figure 4 It is the partial view of the distribution beam provided by the embodiment of the present application;

[0021] Figure 5 It is the partial view of the adjustable locking device provided by the embodiment of the present application.

[0022] The reference signs in the drawings are:

[0023] 1. Adjustable component; 11. Moving frame; 12. Adjustable nested component; 12-1. Base plate; 12-2. Side plate; 12-3. Fixed block; 13. Upper lifting lug; 14. Roller assembly; 2. Main load-bearing component; 21. Balancing beam; 22. Connecting beam; 23. Distribution beam; 24. Lower lifting lug; 3. Adjustable locking device; 31. Screw; 32. Nut; 4. Mounting block; 5. Hook; 6. Hoisting steel wire rope. Specific implementation manners:

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment 1

[0026] Referring to Figures 1 to 5 , the embodiment of the present utility model provides a special lifting tool for variable-section steel box girders with adjustable center of gravity, including an adjustable component 1, a main load-bearing component 2 and an adjustable locking device 3.

[0027] The adjustable member 1 includes a moving frame 11, four groups of adjustable nested members 12, and a roller assembly 14. Among them, the moving frame 11 is made of steel pipes and has a rectangular frame structure. The four groups of adjustable nested members 12 are fixedly installed at the four corners of the moving frame 11 (by bolts and nuts).

[0028] The adjustable nested member 12 is nested on the main load-bearing member 2. The roller assembly 14 is arranged inside the adjustable nested member 12. The adjustable nested member 12 is slidably connected to the main load-bearing member 2 through the roller assembly 14, facilitating the walking of the adjustable member on the shoulder pole beam 21. The adjustable locking device 3 is detachably installed on the adjustable member 1 and the main load-bearing member 2 for locking the adjustable member 1 and the main load-bearing member 2 after adjusting the center of gravity.

[0029] During application, the position of the adjustable nested member 12 can be adjusted by the relative sliding of the roller assembly 14 and the main load-bearing member 2, so as to make the center of gravity of the steel box girder coincide with the position of the suspension point. After the adjustment is completed, the adjustable member 1 and the main load-bearing member 2 are fixed by the adjustable locking device 3 to maintain the stability of the device.

[0030] Embodiment 2

[0031] The main structure of this embodiment is the same as that of Embodiment 1, and the difference lies in that the structure of the main load-bearing member 2 is defined in this embodiment.

[0032] Specifically, referring to Figures 1 to 2 and Figure 4 , the main load-bearing member 2 includes a shoulder pole beam 21, a connecting beam 22, and a distribution beam 23.

[0033] Two groups of shoulder pole beams 21 are provided, and the two groups of shoulder pole beams 21 are arranged in parallel. The shoulder pole beam 21 is made of H-shaped steel and presents an "I" - shaped structure. Steel plates or angle steels are welded on both sides of the shoulder pole beam 21 to increase the strength of the shoulder pole beam 21. The length can be determined according to the length of the variable cross-section steel box girder to be hoisted. The adjustable nested member 12 is slidably connected to the shoulder pole beam 21 through the roller assembly 14.

[0034] Several groups of connecting beams 22 are provided and are fixedly arranged side by side between the two groups of shoulder pole beams 21. The length can be determined according to the width of the variable cross-section steel box girder to be hoisted. The connecting beam 22 includes steel pipes and steel plates. The steel plates are welded at both ends of the steel pipes, and the steel plates are fixedly connected to the shoulder pole beam 21 through bolts and nuts.

[0035] The number of the distribution beams 23 is set to match the number of the lifting lugs on the lifted object. The distribution beams 23 are arranged above the lifting beams 21 and fixedly connected to the two groups of lifting beams 21. The distribution beams 23 are arranged in parallel with the connecting beams 22 and include H-shaped steel and lower connecting members. The top of the lower connecting member is welded to the bottom of the H-shaped steel, and the bottom of the lower connecting member is fixedly connected to the lifting beam 21 by bolts and nuts. In addition, each distribution beam 23 is fixedly installed with 2 lower lifting lugs 24. The lower lifting lugs 24 are welded to both ends of the bottom of the H-shaped steel of the distribution beam 23, and the lower lifting lugs 24 are distributed outside the lower connecting member, and the steel box girder is directly lifted by a steel wire rope.

[0036] Embodiment 3

[0037] The main structure of this embodiment is the same as that of Embodiment 2, and the difference lies in that: the structure of the adjustable nested member 12 is defined in this embodiment.

[0038] Specifically, referring to Figure 3 , the cross section of the adjustable nested member 12 is in a structure, externally clamped on the lifting beam 21 (H-shaped steel), and includes a base plate 12-1 and two side plates 12-2. The two side plates 12-2 are symmetrically and fixedly arranged on both sides of the base plate 12-1. The roller assembly 14 includes a bearing and a roller, and is installed on the inner surface of the base plate 12-1; the lifting beam 21 is nested inside the adjustable nested member 12 and is slidably connected to the roller. The upper surface of the base plate 12-1 of the adjustable nested member 12 is welded with upper lifting lugs 13. The number of the upper lifting lugs 13 is 4, and the upper lifting lugs 13 are formed by punching holes in a steel plate and are used for connecting a hoisting machine.

[0039] Embodiment 4

[0040] The main structure of this embodiment is the same as that of Embodiment 3, and the difference lies in that: the structure of the adjustable locking device 3 is defined in this embodiment.

[0041] Specifically, referring to Figure 5 , the adjustable locking device 3 includes two groups of screw fixing members. Fixed blocks 12-3 are respectively arranged on the inner sides of the two side plates 12-2 of the adjustable nested member 12. The two groups of fixed blocks 12-3 are symmetrically arranged, and through holes are formed in the fixed blocks 12-3. The two groups of screw fixing members are respectively arranged at the two fixed blocks 12-3. The screw fixing member includes a screw 31 and a nut 32. The screw 31 passes through the through hole of the fixed block 12-3 and is fixedly connected to the lifting beam 21 by the nut 32.

[0042] An installation block 4 is arranged below the lifting beam 21, and a through hole adapted to the screw 31 is arranged on the installation block 4. The screw 31 passes through the through holes of the fixed block 12-3 and the installation block 4 at the same time, and is fixed by screwing the nut 32.

[0043] During application, first, the adjustable nested member 12 moves relative to the balance beam 21, thereby adjusting the position of the adjustable nested member 12 to make the center of gravity of the steel box girder coincide with the position of the lifting point. After the adjustment is completed, the screw 31 is simultaneously passed through the through holes of the fixed block 12-3 and the mounting block 4, and each set of nuts 32 is screwed to move towards the fixed block 12-3 / mounting block 4 and press against it, realizing the relative fixation of the adjustable member 1 and the main load-bearing member 2. When readjustment is needed, each set of nuts 32 is screwed to move away from the fixed block 12-3 / mounting block 4, and then the position of the adjustable nested member 12 is adjusted. After the adjustment is completed, it is locked and fixed again through the adjustable locking device 3, thereby ensuring the stability of the center of gravity during the hoisting process.

[0044] In this technical solution, according to the actual gravity distribution of the variable cross-section steel box girder, the special lifting tool realizes the more stable and efficient hoisting of the variable cross-section steel box girder by adjusting the relative position of the adjustable member on the main load-bearing member.

[0045] The above is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above embodiments. Any technical solution falling within the idea of the present invention belongs to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder, characterized in that it includes an adjustable component (1), a main load-bearing component (2), and an adjustable locking device (3); The adjustable component (1) includes a moving frame (11), an adjustable nested component (12), and a roller assembly (14); The adjustable nested component (12) is nested on the main load-bearing component (2), and the moving frame (11) is fixedly connected to the adjustable nested component (12); The roller assembly (14) is arranged inside the adjustable nested component (12), and the adjustable nested component (12) is slidably connected to the main load-bearing component (2) through the roller assembly (14); The adjustable locking device (3) is detachably installed on the adjustable component (1) and the main load-bearing component (2) for locking the adjustable component (1) and the main load-bearing component (2) after adjusting the center of gravity.

2. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 1, characterized in that The main load-bearing component (2) includes a crossbeam (21), a connecting beam (22), and a distribution beam (23); Two groups of crossbeams (21) are provided, and the two groups of crossbeams (21) are arranged in parallel; Several groups of connecting beams (22) are provided and fixedly arranged between the two groups of crossbeams (21); Several groups of distribution beams (23) are provided, arranged above the crossbeams (21) and fixedly connected to the two groups of crossbeams (21); The adjustable nested component (12) is slidably connected to the crossbeam (21) through the roller assembly (14).

3. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 2, characterized in that Four groups of adjustable nested components (12) are provided and are respectively fixedly connected to the moving frame (11); The cross-section of the adjustable nested member (12) is in the shape of " " structure, including a base plate (12-1) and two side plates (12-2), and the two side plates (12-2) are symmetrically and fixedly arranged on both sides of the base plate (12-1); The roller assembly (14) includes a bearing and a roller, and is installed on the inner surface of the base plate (12-1); The crossbeam (21) is nested inside the adjustable nested component (12) and is slidably connected to the roller.

4. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 3, characterized in that An upper lifting lug (13) is provided on the upper surface of the base plate (12-1) of the adjustable nested component (12).

5. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 3, characterized in that The adjustable locking device (3) includes two groups of screw fixing parts; Fixed blocks (12-3) are respectively arranged on the inner sides of the two side plates (12-2) of the adjustable nested component (12), the two groups of fixed blocks (12-3) are symmetrically arranged, and through holes are provided in the fixed blocks (12-3); Two groups of screw fixing parts are respectively arranged at the two fixed blocks (12-3); The screw fixing part includes a screw (31) and a nut (32); The screw (31) passes through the through hole of the fixed block (12-3) and is fixedly connected to the crossbeam (21) through the nut (32).

6. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 5, characterized in that An installation block (4) is provided below the balance beam (21), and a through hole adapted to the screw (31) is provided on the installation block (4); the screw (31) simultaneously passes through the through holes of the fixing block (12-3) and the installation block (4), and is fixed by screwing the nut (32).

7. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 1, characterized in that The moving frame (11) is in a rectangular frame structure, and four groups of adjustable nested components (12) are fixedly installed at the four corners of the moving frame (11).

8. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 2, characterized in that The balance beam (21) is made of H-shaped steel and presents an "I" - shaped structure; steel plates or angle steels are welded on both sides of the balance beam (21) to increase the strength of the balance beam (21); The connecting beam (22) includes a steel pipe and a steel plate, the steel plate is welded at both ends of the steel pipe, and the steel plate is fixedly connected to the balance beam (21) through bolts and nuts; The distribution beam (23) is arranged in parallel with the connecting beam (22), and includes an H-shaped steel and a lower connecting member. The top of the lower connecting member is fixedly connected to the bottom of the H-shaped steel, and the bottom of the lower connecting member is fixedly connected to the balance beam (21).

9. The special lifting tool for an adjustable center-of-gravity variable cross-section steel box girder according to claim 8, characterized in that A number of lower lifting lugs (24) are fixedly installed on the distribution beam (23), the lower lifting lugs (24) are welded at the bottom end of the H-shaped steel of the distribution beam (23), and the lower lifting lugs (24) are distributed outside the lower connecting member.

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