A box girder hoisting device and its hoisting method

Abstract

The present invention relates to the technical field of box girder hoisting, and specifically discloses a box girder hoisting device and a hoisting method thereof. The box girder hoisting device includes a hoisting frame and a hoisting assembly. The extending direction of the hoisting frame is defined as the front-back direction, and the hoisting assembly is arranged on the hoisting frame at intervals in the front-back direction. The hoisting assembly includes two hoisting members symmetrically arranged on the left and right of the hoisting frame. The hoisting member includes a support rod and a sliding rod; one end of the support rod is rotatably connected to the hoisting frame, and a driving assembly for driving the support rod to rotate is provided on the hoisting frame. The sliding rod is slidably connected to the other end of the support rod, and a driving member for driving the sliding rod to move is provided on the support rod; when the driving assembly drives the support rod to rotate by a preset angle, the driving member drives the sliding rod to extend out until the two symmetrically arranged sliding rods on the left and right are both abutted against the box girder. The box girder hoisting device and the hoisting method thereof of the present invention can effectively prevent the phenomenon of the box girder from tilting and ensure that the box girder can be accurately placed and installed.

Description

Technical Field

[0001] The invention relates to the technical field of box girder hoisting, and in particular to a box girder hoisting device and a hoisting method thereof. Background Art

[0002] As an important building structural component, the accuracy and integrity of the box girder are crucial for subsequent installation and use. In order to ensure that the box girder is not damaged during the hoisting process, maintain its original shape and size, and that the hoisting process can be carried out more smoothly and efficiently, it is necessary to ensure the balance between the box girder and the hoisting device when hoisting the box girder.

[0003] A Chinese patent with announcement number CN117163817B discloses a prefabricated box girder lifting device and method, wherein the prefabricated box girder lifting device includes a positioning assembly, a connecting assembly, a limiting assembly, an angle adjustment assembly, a locking assembly and a moving assembly, the positioning assembly includes a box body, a first limiting block, a second limiting block, a gear and a motor, the angle adjustment assembly includes an angle adjustment unit, the angle adjustment unit includes a support arm, an adjustment rod and a second hydraulic cylinder, and the moving assembly includes a moving seat, a fourth hydraulic cylinder, a fixed plate, a counterweight and a lifting lug.

[0004] The above patent drives the fixed plate to move by the fourth hydraulic cylinder, and the fixed plate drives the box of the adjustment assembly to move so that the box can correspond to the center line of the box beam. However, the lifting lug is set on the moving seat. When the fixed plate drives the box to move and adjust the position, the center line position of the box and the moving seat will be offset. Although the box clamps the box beam by the first limit block, the second limit block and the support arm symmetrically arranged on both sides of the box beam to center the box beam and the box, the center lines of the box beam and the moving seat may be staggered, and the lifting lug corresponds to the center line of the moving seat. Therefore, when lifting through the lifting lug, the box beam may tilt, affecting the accurate installation of the box beam.

[0005] Therefore, the art needs a box girder hoisting device and a hoisting method thereof to solve the above problems. Summary of the invention

[0006] The present invention provides a box girder hoisting device and a hoisting method thereof, aiming to solve the problem that the hoisting device in the related art cannot ensure that the center line is aligned with the center line of the box girder, resulting in the box girder being easily skewed during hoisting.

[0007] On the one hand, the present invention provides a box girder hoisting device, comprising a hoisting frame and a hoisting assembly arranged on the hoisting frame, wherein the hoisting frame extends along the length direction of the box girder, and the extension direction of the hoisting frame is defined as the front-to-back direction, and the hoisting assembly is arranged on the hoisting frame at intervals along the front-to-back direction, and the hoisting assembly comprises two hoisting members arranged on the hoisting frame in a left-right symmetrical manner, and the hoisting member comprises a support rod and a sliding rod;

[0008] One end of the support rod is rotatably connected to the lifting frame, and a driving assembly for driving the support rod to rotate is arranged on the lifting frame. The sliding rod is slidably connected to the other end of the support rod, and a driving member for driving the sliding rod to move along the extending direction of the support rod is arranged on the support rod.

[0009] When the driving assembly drives the support rod to rotate a preset angle towards the box girder, the driving member drives the sliding rod to extend until the two symmetrically arranged sliding rods on the left and right are both in contact with the box girder.

[0010] By deploying the lifting members symmetrically on the left and right on the lifting frame, first, a stable balance state between the lifting frame and the lifting members is ensured. By synchronously rotating the support rod to an inclined state and extending the sliding rod, the relative position between the lifting frame and the box girder is adjusted to achieve precise centering, ensuring that the center lines on the left and right sides of the lifting frame are exactly aligned vertically with the center lines on the left and right sides of the box girder. Thus, the balance state between the entire lifting frame and the box girder is maintained during the lifting operation, effectively preventing the box girder from tilting, which is beneficial for the precise placement and installation of the box girder.

[0011] Preferably, a clamping rod is rotatably connected to the rotating shaft where the support rod is rotatably connected to the lifting frame. A torsion spring is arranged at the rotating connection between the clamping rod and the rotating shaft. When the torsion spring is in a natural state, the included angle between the clamping rod and the support rod is an acute angle. When the two symmetrically arranged sliding rods on the left and right are both in contact with the box girder, the clamping rod abuts against the left and right sides of the box girder.

[0012] The clamping rod cooperates with the sliding rod and the support rod to fix the position of the box girder, improving the stability of the box girder during the lifting process.

[0013] Preferably, a limiting assembly is arranged on the lifting frame. When the support rod rotates to a horizontal state, the driving member drives the sliding rod to extend to support the bottom of the box girder, the clamping rod abuts against the left and right sides of the box girder, and the limiting assembly restricts the movement of the clamping rod.

[0014] By restricting the movement of the clamping rod through the limiting assembly, the clamping rod is kept in a position where it tightly abuts against the left and right sides of the box girder, forming a fixation for the box girder in the left - right direction. At the same time, when the support rod rotates to a horizontal state, the automatic telescopic cylinder two is controlled to drive the sliding rod to extend, so that the sliding rod supports the bottom of the box girder, thereby further improving the stability during the lifting of the box girder.

[0015] Preferably, the driving assembly includes a first telescopic cylinder and a connecting rod. The first telescopic cylinder extends vertically and is fixedly installed on the lifting frame. Two ends of the connecting rod are respectively hinged to the driving end of the first telescopic cylinder and the rod body of the support rod. The first telescopic cylinder drives the connecting rod to drive the support rod to rotate.

[0016] Preferably, the connecting rod is hinged to the first telescopic cylinder through a rotating shaft. A guiding groove extending vertically is formed on the lifting frame. The rotating shaft extends into the guiding groove and is in sliding fit with the guiding groove vertically.

[0017] Driving the connecting rod by the first telescopic cylinder to drive the support rod to rotate ensures the stability of the support rod during the rotation process. Moreover, when the support rod and the sliding rod support and lift the box girder, the cooperation between the guiding groove and the rotating shaft provides stable support for the support rod, improving the reliability of the lifting device.

[0018] Preferably, the limiting assembly includes a limiting post and a limiting groove. The limiting post is fixedly connected to the clamping rod. The limiting groove is formed on the connecting rod. When the support rod rotates to the horizontal state, the limiting post is clamped in the limiting groove.

[0019] Preferably, plugging structures are arranged at the ends of two symmetrically arranged sliding rods on the left and right. After the support rod rotates to the horizontal state, the driving member drives the two sliding rods to move towards each other until the plugging structures are plugged together.

[0020] Through the cooperation of the plugging structures, the support stability and reliability of the support rod and the sliding rod for the box girder can be further improved.

[0021] Preferably, a receiving groove for receiving the connecting rod, the support rod and the clamping rod is formed on the lifting frame.

[0022] In the initial state, the support rod, the connecting rod and the clamping rod are all located in the receiving groove, ensuring that there is no extra structure protruding between the mounting rods. When the lifting frame is lifted above the box girder for installation, it can effectively prevent the support rod, the connecting rod and the clamping rod from accidentally touching the box girder, thus ensuring that the lifting frame can be placed in place smoothly and steadily.

[0023] Preferably, a supporting plate is arranged below the support rod on the lifting frame. When the support rod rotates to the horizontal state, the support rod is in contact with the supporting plate.

[0024] When the support rod rotates to the horizontal state, the support rod is in contact with the supporting plate, enabling the supporting plate to also support the support rod and the sliding rod, further improving the support stability and reliability for the box girder.

[0025] On the other hand, the present invention also provides a method for hoisting a box girder, using the box girder hoisting device described in any one of the above preferred technical solutions. The method for hoisting a box girder includes the following steps:

[0026] Hoist the hoisting frame so that it is located above the box girder, and the hoisting members are located on the left and right sides of the box girder;

[0027] Control the driving assembly to drive the support rod to rotate towards the box girder. When it rotates a preset angle, the driving member drives the sliding rod to extend. When the two symmetrically arranged sliding rods on the left and right both abut against the box girder, the midline between the left and right sides of the hoisting frame is aligned with the midline between the left and right sides of the box girder;

[0028] Hoist the hoisting frame, and the hoisting frame hoists the box girder through the sliding rod and the support rod.

[0029] The beneficial effects of the method for hoisting a box girder of the present invention are the same as those of the box girder hoisting device of the present invention, and will not be elaborated here.

[0030] The beneficial effects of the present invention are as follows: By deploying the hoisting members symmetrically on the left and right sides of the hoisting frame, the present invention ensures a stable balance state between the hoisting frame and the hoisting members. By synchronously rotating the support rod to an inclined state and extending the sliding rod, the relative position between the hoisting frame and the box girder is adjusted to achieve precise centering, ensuring that the midline between the left and right sides of the hoisting frame completely coincides with the midline between the left and right sides of the box girder in the vertical direction. Thus, the balance state between the entire hoisting frame and the box girder is maintained during the hoisting operation, effectively preventing the box girder from tilting, which is beneficial for the precise placement and installation of the box girder. Description of the Drawings

[0031] Figure 1 is a state diagram of the box girder hoisting device of the present invention when hoisting a box girder.

[0032] Figure 2 is a front view of the box girder hoisting device of the present invention when hoisting a box girder.

[0033] Figure 3 is a right view of the box girder hoisting device of the present invention when hoisting a box girder.

[0034] Figure 4 is Figure 3 a cross-sectional view of the middle section A-A.

[0035] Figure 5 is a schematic diagram of the driving assembly and the support rod of the box girder hoisting device of the present invention from the first perspective.

[0036] Figure 6 is a schematic diagram of the driving assembly and the support rod of the box girder hoisting device of the present invention from the second perspective.

[0037] Figure 7 It is a cross-sectional view of the lifting frame of a box girder lifting device of the present invention.

[0038] Reference numerals:

[0039] 1. Lifting frame; 11. Top plate; 12. Mounting rod; 13. Suspension ring; 14. Guide groove; 15. Accommodating groove; 16. Avoidance groove; 17. Support plate; 2. Support rod; 21. Mounting groove; 3. Sliding rod; 31. Insertion column; 32. Insertion slot; 33. Accommodating hole; 34. Spring; 4. Box girder; 5. Clamping rod; 51. Limit column; 6. First automatic telescopic cylinder; 61. Link rod; 62. Rotating shaft; 63. Limit groove; 7. Second automatic telescopic cylinder. Detailed implementation manners

[0040] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0041] As Figures 1 to 7 shown, a box girder lifting device of the present invention includes a lifting frame 1 and a lifting assembly provided on the lifting frame 1. The lifting frame 1 includes a top plate 11 and a mounting rod 12 integrally formed with the top plate 11. The top plate 11 extends along the length direction of the box girder 4. The extending direction of the top plate 11 is defined as the front-back direction. Four suspension rings 13 are fixedly connected to the top of the top plate 11. The four suspension rings 13 are arranged in a matrix, and the center of the rectangle formed by the connection lines between the four suspension rings 13 and the center of the top plate 11 are located on the same vertical line. The cross-section of the top plate 11 is rectangular. The mounting rod 12 extends vertically and is connected to the bottom of the top plate 11 near the four corners.

[0042] Two groups of lifting assemblies are provided and are arranged on the lifting frame 1 at intervals in the front-back direction. The lifting assembly includes two lifting members symmetrically arranged on the left and right on the lifting frame 1. The lifting member includes a support rod 2 and a sliding rod 3. One end of the support rod 2 is rotatably connected to the mounting rod 12 of the lifting frame 1. A driving assembly for driving the support rod 2 to rotate is provided on the lifting frame 1. The sliding rod 3 is slidably connected to the other end of the support rod 2. A driving member for driving the sliding rod 3 to move along the extending direction of the support rod 2 is provided on the support rod 2.

[0043] When hoisting the box girder 4, the box girder 4 is placed on the support pier for supporting the box girder 4. The hoisting frame 1 is lifted so that the top plate 11 of the hoisting frame 1 is located above the box girder 4, and the hoisting members are located on the left and right sides of the box girder 4. In the initial state, the support rod 2 is in a vertical state, and the bottom end of the support rod 2 is rotatably connected to the mounting rod 12. Then, all the drive components are controlled to synchronously drive the support rod 2 to rotate towards the box girder 4, and the rotation stops when a preset angle is rotated. All the driving members are controlled to drive the sliding rod 3 to extend. If there is a deviation in the position between the hoisting frame 1 and the box girder 4, then one of the sliding rods 3 will first contact the inclined side of the box girder 4, and during the continuous extension process, it will push the hoisting frame 1 to move. When both sliding rods 3 are in contact with the box girder 4, the positions of the hoisting frame 1 and the box girder 4 are aligned. After that, the hoisting ring 13 is hoisted, and the hoisting frame 1 supports through the sliding rod 3 and the support rod 2 to hoist the box girder 4.

[0044] In the present invention, by symmetrically arranging the hoisting members on the left and right sides of the hoisting frame 1, first, the balance between the hoisting frame 1 and the hoisting members is ensured. Then, by synchronously rotating the support rod 2 to an inclined state and extending the sliding rod 3, the position between the hoisting frame 1 and the box girder 4 is adjusted and aligned, ensuring that the midline position between the left and right sides of the hoisting frame 1 is vertically aligned with the midline position between the left and right sides of the box girder 4, thereby realizing the balance between the entire hoisting frame 1 and the box girder 4 during the hoisting process, avoiding the box girder 4 from being skewed, and being beneficial to accurately placing and installing the box girder 4.

[0045] As Figure 4 shown, a clamping rod 5 is rotatably connected to the rotating shaft where the support rod 2 is rotatably connected to the hoisting frame 1. A torsion spring (not shown in the figure) is provided at the rotating connection of the clamping rod 5 and the rotating shaft. When the torsion spring is in a natural state, the included angle between the clamping rod 5 and the support rod 2 is an acute angle. During the process of the support rod 2 rotating from a vertical state towards the box girder 4, the clamping rod 5 follows the support rod 2 to rotate. After the support rod 2 rotates a preset angle, the clamping rod 5 abuts against the box girder 4. When both symmetrically arranged sliding rods 3 are in contact with the box girder 4, both symmetrically arranged clamping rods 5 are tightly abutted against the box girder 4 under the elastic force of the torsion spring, and the clamping rod 5 cooperates with the sliding rod 3 and the support rod 2 to fix the position of the box girder 4.

[0046] As Figures 4 to 7As shown in the figure, the driving assembly includes a first telescopic cylinder 6 and a connecting rod 61. The first telescopic cylinder 6 extends vertically and is fixedly installed on the mounting rod 12. There are two connecting rods 61 symmetrically arranged in the front-rear direction. One end of the connecting rod 61 is hinged to the driving end of the first telescopic cylinder 6 through a rotating shaft 62, and the other end is hinged to the rod body of the support rod 2. As an example, the first telescopic cylinder 6 is an electric telescopic cylinder. A guiding groove 14 extending vertically is formed on the mounting rod 12. The rotating shaft 62 extends into the guiding groove 14 and is slidably matched with the guiding groove 14 vertically. When controlling the first telescopic cylinder 6 to extend, the first telescopic cylinder 6 drives the rotating shaft 62 to drive one end of the connecting rod 61 to move downward, and the other end of the connecting rod 61 drives the support rod 2 to rotate downward towards the box girder 4. When controlling the first telescopic cylinder 6 to contract, the first telescopic cylinder 6 drives the rotating shaft 62 to drive one end of the connecting rod 61 to move upward, and the other end of the connecting rod 61 drives the support rod 2 to rotate upward.

[0047] Continue to refer to Figure 4 , the driving member is a second telescopic cylinder 7. As an example, the second telescopic cylinder 7 is an electric telescopic cylinder. An installation groove 21 for accommodating the second telescopic cylinder 7 is formed in the support rod 2. The second telescopic cylinder 7 is fixedly installed in the installation groove 21, and the sliding rod 3 is fixedly connected to the driving end of the second telescopic cylinder 7.

[0048] Continue to refer to Figures 4 to 6 , a limiting assembly is arranged on the lifting frame 1. The limiting assembly includes a limiting column 51 and a limiting groove 63. The limiting column 51 is fixedly connected to the clamping rod 5, and the limiting groove 63 is formed on the connecting rod 61. To improve the stability during the lifting of the box girder 4, after the two symmetrically arranged sliding rods 3 on the left and right extend and all abut against the box girder 4, control the first telescopic cylinder 6 to continue to drive the connecting rod 61 to drive the support rod 2 to rotate downward, and at the same time control the second telescopic cylinder 7 to drive the sliding rod 3 to contract into the support rod 2, so as to avoid interference with the rotation of the support rod 2 when the sliding rod 3 abuts against the box girder 4 during the downward rotation of the support rod 2. Since the clamping rod 5 tightly abuts against both sides of the box girder 4 under the elastic force of the torsion spring, therefore, after the sliding rod 3 contracts and disengages from the contact with the box girder 4, the relative position between the box girder 4 and the lifting frame 1 will not change. When the support rod 2 rotates to the horizontal state, the limiting groove 63 on the connecting rod 61 is engaged with the limiting column 51 on the clamping rod 5. The cooperation of the limiting groove 63 and the limiting column 51 restricts the movement of the clamping rod 5, so that the clamping rod 5 remains in the position of tightly abutting against both sides of the box girder 4 in the left-right direction, and fixes the box girder 4 in the left-right direction. At the same time, when the support rod 2 rotates to the horizontal state, control the second telescopic cylinder 7 to drive the sliding rod 3 to extend, so that the sliding rod 3 supports the bottom of the box girder 4, thereby ensuring the stability during the process of lifting the box girder 4.

[0049] As Figure 2 and Figure 4As shown, when the support rod 2 rotates to the horizontal state, the rotating shaft 62 where the connecting rod 61 is rotatably connected to the first automatic telescopic cylinder 6 just moves to the bottom end of the guide groove 14. When the support rod 2 and the sliding rod 3 support and hoist the bottom of the box girder 4, the rotating shaft 62 cooperates with the guide groove 14 to support the support rod 2, ensuring the stability and reliability of the support rod 2.

[0050] The ends of the two symmetrically arranged left and right sliding rods 3 are provided with a plugging structure. The plugging structure includes a plugging post 31 and a plugging groove 32. The plugging groove 32 is opened at the end of the left sliding rod 3, and a receiving hole 33 is opened at the end of the right sliding rod 3. The plugging post 31 is inserted into the receiving hole 33 and is elastically connected to the receiving hole 33 through a spring 34. It should be noted that the elastic potential energy of the spring 34 is relatively large. When the sliding rod 3 extends to perform centering positioning on the box girder 4 and the hoisting frame 1, the plugging post 31 can be compressed into the receiving hole 33 without affecting the centering positioning of the box girder 4 and the hoisting frame 1. Through the cooperation of the plugging structure, the support stability and reliability of the support rod 2 and the sliding rod 3 for the box girder 4 can be further improved.

[0051] As Figure 4 and Figure 7 shown, a receiving groove 15 is opened in the mounting rod 12. When the first automatic telescopic cylinder 6 drives the connecting rod 61 to drive the support rod 2 to rotate upward to the vertical state, the support rod 2, the connecting rod 61, and the clamping rod 5 are all located in the receiving groove 15, ensuring that there is no other structure protruding between the mounting rods 12. When hoisting the hoisting frame 1 onto the box girder 4, it is avoided that the support rod 2, the connecting rod 61, and the clamping rod 5 accidentally touch the box girder 4, which is beneficial to the smooth placement of the hoisting frame 1. In addition, an avoidance groove 16 for avoiding the limit post 51 on the clamping rod 5 is opened on the receiving groove 15, facilitating the smooth storage of the clamping rod 5 into the receiving groove 15.

[0052] A support plate 17 is provided at the bottom of the receiving groove 15. When the support rod 2 rotates to the horizontal state, the support rod 2 fits with the support plate 17. The support plate 17 forms a stop for the downward rotation of the support rod 2 and the sliding rod 3, and at the same time has a certain supporting force on the support rod 2, further improving the support stability and reliability for the box girder 4.

[0053] A method for hoisting a box girder, using the box girder hoisting device in the above embodiment, the box girder hoisting device method includes the following steps:

[0054] Hoist the hoisting frame 1 onto the box girder 4 through the lifting ring 13, so that the top plate 11 of the hoisting frame 1 is located above the box girder 4, and the hoisting members are located on the left and right sides of the box girder 4;

[0055] Control the automatic telescopic cylinder 1 to drive the support rod 2 to rotate towards the box girder 4. Stop driving when it rotates a preset angle. At this time, the clamping rod 5 rotates out of the accommodation groove 15 and abuts against both sides of the box girder 4. Control the automatic telescopic cylinder 2 to drive the sliding rod 3 to extend. When the two symmetrically arranged sliding rods 3 on the left and right both abut against the box girder 4, the midline between the left and right sides of the lifting frame 1 is aligned with the midline between the left and right sides of the box girder 4 in the vertical direction. The clamping rod 5 tightly abuts against both sides of the box girder 4 under the elastic force of the torsion spring, forming a preliminary positioning of the box girder 4 in the left and right directions.

[0056] Control the automatic telescopic cylinder 1 to continue driving the connecting rod 61 to drive the support rod 2 to rotate downward. At the same time, control the automatic telescopic cylinder 2 to drive the sliding rod 3 to contract into the support rod 2. When the support rod 2 rotates to the horizontal state, control the automatic telescopic cylinder 2 to drive the sliding rod 3 to extend, so that the sliding rod 3 supports the bottom of the box girder 4. At the same time, the limiting groove 63 on the connecting rod 61 is engaged with the limiting post 51 on the clamping rod 5, so that the clamping rod 5 remains in the position of tightly abutting against both sides of the box girder 4, forming a fixation of the box girder 4 in the left and right directions.

[0057] Lift the lifting frame 1, and the lifting frame 1 lifts the box girder 4 through the sliding rod 3 and the support rod 2.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A box girder hoisting device, comprising a hoisting frame and a hoisting assembly arranged on the hoisting frame, characterized in that, The hoisting frame extends along the length direction of the box girder. The extending direction of the hoisting frame is defined as the front-back direction. The hoisting components are arranged on the hoisting frame at intervals in the front-back direction. The hoisting components include two hoisting members symmetrically arranged left and right on the hoisting frame. The hoisting member includes a support rod and a sliding rod. One end of the support rod is rotatably connected to the hoisting frame, and a driving assembly for driving the support rod to rotate is arranged on the hoisting frame. The sliding rod is slidably connected to the other end of the support rod, and a driving member for driving the sliding rod to move along the extending direction of the support rod is arranged on the support rod. When the driving assembly drives the support rod to rotate a preset angle towards the direction close to the box girder, the driving member drives the sliding rod to extend until both of the symmetrically arranged left and right sliding rods abut against the box girder. A clamping rod is rotatably connected to the rotating shaft of the support rod and the hoisting frame. A torsion spring is arranged at the rotating connection of the clamping rod and the rotating shaft. When the torsion spring is in a natural state, the included angle between the clamping rod and the support rod is an acute angle. When both of the symmetrically arranged left and right sliding rods abut against the box girder, the clamping rod abuts against the left and right sides of the box girder. The driving assembly includes a first automatic telescopic cylinder and a connecting rod. The first automatic telescopic cylinder extends vertically and is fixedly installed on the hoisting frame. The two ends of the connecting rod are respectively hinged to the driving end of the first automatic telescopic cylinder and the rod body of the support rod. The first automatic telescopic cylinder drives the connecting rod to drive the support rod to rotate. The connecting rod is hinged to the first automatic telescopic cylinder through a rotating shaft. A guiding groove extending vertically is formed on the hoisting frame. The rotating shaft extends into the guiding groove and is slidably matched with the guiding groove vertically. A limiting assembly is arranged on the hoisting frame. When the support rod rotates to a horizontal state, the driving member drives the sliding rod to extend to support the bottom of the box girder, and the clamping rod abuts against the left and right sides of the box girder. The limiting assembly limits the movement of the clamping rod. The limiting assembly includes a limiting column and a limiting groove. The limiting column is fixedly connected to the clamping rod, and the limiting groove is formed on the connecting rod. When the support rod rotates to a horizontal state, the limiting column is clamped in the limiting groove. Plugging structures are arranged at the ends of the two symmetrically arranged left and right sliding rods. After the support rod rotates to a horizontal state, the driving member drives the two sliding rods to move towards each other until the plugging structures are plugged together.

2. The box girder hoisting device according to claim 1, characterized in that, A receiving groove for receiving the connecting rod, the support rod and the clamping rod is formed on the hoisting frame.

3. The box girder hoisting device according to claim 2, characterized in that, A support plate is arranged below the support rod on the hoisting frame. When the support rod rotates to a horizontal state, the support rod fits with the support plate.

4. A method for hoisting a box girder, characterized in that, When using the box girder hoisting device according to any one of claims 1 to 3, the box girder hoisting method includes the following steps: Hoist the hoisting frame so that it is located above the box girder, and the hoisting members are located on the left and right sides of the box girder. Control the driving assembly to drive the support rod to rotate towards the direction close to the box girder. When rotating a preset angle, the driving member drives the sliding rod to extend. When both of the symmetrically arranged left and right sliding rods abut against the box girder, the midline between the left and right sides of the hoisting frame is aligned with the midline between the left and right sides of the box girder. Hoist the hoisting frame, and the hoisting frame hoists the box girder through the sliding rod and the support rod.

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