Pushing support for steel box girder construction and construction method thereof

Abstract

The invention relates to the technical field of bridge construction, and particularly discloses a pushing support for steel box girder construction and a construction method thereof.The pushing support for steel box girder construction comprises a main frame body; two longitudinal beams are arranged at the top of the main frame body, and cross beams are arranged on the longitudinal beams; the pushing mechanism is arranged on the cross beam and used for lifting in the vertical direction and pushing the steel box girder in the horizontal direction; the balance mechanism comprises a balance block arranged on the longitudinal beam in a sliding mode, a driving assembly used for driving the balance block to move and an adjusting assembly used for assembling and adjusting the moving direction of the balance block. The device has the effects that the instantaneous internal force peak value transmitted to the main frame body is reduced through the movement of the balance block, so that inertia moment compensation is achieved, and the transverse bending moment borne by the main frame body is reduced.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a jacking support for steel box girder construction and its construction method. Background Technology

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges, named for their box-shaped cross-section. Their main body is constructed using a fully welded process, consisting of a top plate, bottom plate, web, and transverse and longitudinal diaphragms. The top plate often employs an orthotropic bridge deck design with longitudinal stiffeners, characterized by its wide, flat shape and strong bending and torsional resistance.

[0003] The jacking process involves placing a steel box girder on a jacking mechanism mounted on supports. Hydraulic cylinders and other equipment within the jacking mechanism then push the girder segment by segment, moving it forward along a predetermined path. Multiple sets of supports are required for jacking the steel box girder to bear and guide its weight, horizontal thrust, and attitude control during the jacking process. Supports can be categorized as temporary or permanent based on their service life and structural requirements. Temporary supports are primarily used during the construction phase and typically require high detachability, flexible structural arrangement, and a degree of reusability. Permanent supports are generally fixed components of the bridge structure, requiring long-term load-bearing capacity, high structural strength and rigidity, and can work in conjunction with temporary supports during the jacking process.

[0004] In the process of jacking small-curvature steel box girders, longitudinal jacking combined with lateral jacking for correction is often used. However, when the construction site is limited and equipment layout is restricted, the longitudinal plus lateral method is cumbersome and affects construction efficiency. In this case, differential jacking can be used, which creates a curved path by changing the speed difference between the inner and outer curves of the steel box girder. However, the longitudinal speed difference and the weight difference on both sides of the steel box girder in differential jacking will generate a lateral bending moment on the support (the jacking direction is longitudinal, and the width direction of the steel box girder is lateral). The support usually has a larger load-bearing capacity in the vertical direction and a weaker ability to resist lateral bending moments. In this case, it is necessary to strengthen the support. Alternatively, a counterweight structure (such as a water tank) can be placed on the steel box girder to change the center of gravity of the steel box girder, thereby reducing the momentum difference between the supports on the inner and outer curve sides of the same row when the steel box girder accelerates / decelerates, and thus reducing the lateral bending moment of the steel box girder.

[0005] Regarding the aforementioned technologies, the inventors believe that the following drawbacks exist: the process of placing counterweight structures on steel box girders is cumbersome, and the position of the counterweight structures needs to be constantly adjusted as the steel box girders move. Furthermore, if the support structure is significantly increased and the safety factor is excessively raised, the requirements for the installation environment and geological conditions are high, and disassembly and assembly are difficult, resulting in an increase in non-reusable structural components. Summary of the Invention

[0006] To address the problem of difficulty in reducing the lateral bending moment of the support in the differential jacking method, this application provides a jacking support for steel box girder construction and its construction method.

[0007] This application provides a jacking support for steel box girder construction and its construction method, which adopts the following technical solution: A jacking support for steel box girder construction includes a main frame; two longitudinal beams are provided on the top of the main frame, and cross beams are provided on the longitudinal beams; The jacking mechanism, mounted on the crossbeam, is used for vertical lifting and horizontal pushing of the steel box girder; The balancing mechanism includes a balance block slidably disposed on the longitudinal beam, a drive assembly for driving the balance block to move, and an adjustment assembly for assembling and adjusting the direction of movement of the balance block.

[0008] Optionally, the adjustment assembly includes guide rails disposed on the two longitudinal beams, a plurality of bolts threadedly connected to the guide rails, ball heads disposed on the bolts, an assembly frame slidably connected to the guide rails, and a connector for connecting the balance block to the assembly frame. The bolts pass through the guide rails and are evenly distributed on both sides of the guide rails. An inclined surface corresponding to the ball head is disposed inside the guide rails, and the inclined surface is inclined in a way that gradually decreases in distance from the guide rails from top to bottom.

[0009] Optionally, the drive assembly includes a support frame fixed to the longitudinal beam, an active rope connected to the jacking mechanism, a driven rope connected to the assembly frame, a movable pulley group connected to the active rope, and a plurality of fixed pulleys arranged on the support frame. The fixed pulleys are used to reverse the direction of the driven rope, and the other end of the driven rope is also connected to the support frame.

[0010] Optionally, the movable pulley block includes a pulley frame and several movable pulley bodies, the pulley frame is fixedly connected to the driving rope, and the driven rope is wound around the movable pulley bodies.

[0011] Optionally, the connecting component is a locking block fixed to both sides of the balance block, and the inner peripheral wall of the assembly frame is provided with a locking groove that is adapted to the locking block for insertion.

[0012] Optionally, a number of lifting rings are fixed to the top of the balance block, and when the balance block is assembled into the assembly frame, two adjacent balance blocks fit together.

[0013] Optionally, there are two crossbeams, and the jacking mechanism includes a slide block disposed on one of the crossbeams, a jacking slide box slidably connected to the slide block, and a jacking jack disposed on the other crossbeam. The output end of the jacking slide box is fixedly connected to the slide block.

[0014] A construction method for a jacking support for steel box girder construction includes the following steps: S1. Main frame construction: Construct the main frame at the designated location and erect longitudinal beams on the main frame; S2. Install the balancing mechanism: Install the adjustment component on the longitudinal beam, then install the drive component on the main frame, and finally assemble the corresponding weight of the balance block on the adjustment component. S3. Installation of the jacking mechanism: Install the crossbeam on the longitudinal beam, install the jacking mechanism on the crossbeam, and test and run the jacking mechanism.

[0015] In summary, this application includes at least one of the following beneficial technical effects: 1. The jacking mechanism gradually pushes the steel box girder forward. During this process, the counterweight is driven by the drive component, so that the counterweight has a component velocity in both the longitudinal and transverse directions. That is, during the acceleration and deceleration phases of the steel box girder, it generates an inertial moment opposite to the direction of the inertial moment of the steel box girder, thereby reducing the peak value of the instantaneous internal force transmitted to the main frame, so as to achieve inertial moment compensation, reduce the transverse and longitudinal bending moments of the main frame, and, together with the combined action of scissor struts and horizontal connecting rods, greatly improve the stability of the main frame. 2. When the direction of the guide rail needs to be adjusted, first loosen the bolts on one side of the guide rail, then tighten the bolts on the other side to the corresponding pitch, so that the ball head presses down on the inclined surface inside the guide rail. Because the ball head on each bolt on the same side presses down to different depths on the inclined surface inside the guide rail, the direction of the guide rail in the horizontal plane is changed. Finally, tighten the bolts that were loosened first to complete the direction adjustment of the guide rail, that is, to change the angle between the moving direction of the push slide box and the moving direction of the assembly frame. The adjustment method is simple and the stability of the guide rail is high. 3. Although the total weight of the assembly frame and the counterweight is still less than the weight borne by the corresponding jacking slide box, the variable speed structure of the moving pulley block enables the assembly frame to have a speed several times higher than that of the jacking slide box, thereby increasing the moment of inertia generated by the assembly frame and reducing the overturning moment transmitted to the main frame when the steel box girder is jacked. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle; Figure 3 This application is primarily used to illustrate the cross-sectional structural diagram of the longitudinal beam, counterweight, lifting ring, and adjustment assembly.

[0017] Reference numerals: 1. Main frame; 11. Steel pipe pile; 12. Pile foundation; 13. Steel column; 14. Scissor brace; 15. Horizontal connecting rod; 21. Longitudinal beam; 22. Cross beam; 3. Jacking mechanism; 31. Slide seat; 32. Jacking slide box; 33. Lifting jack; 34. Pad block; 4. Balancing mechanism; 41. Balance block; 411. Lifting ring; 42. Drive assembly; 421. Support frame; 422. Drive rope; 423. Driven rope; 424. Moving pulley block; 4241. Pulley frame; 4242. Moving pulley body; 425. Fixed pulley; 43. Adjustment assembly; 431. Guide rail; 432. Bolt; 433. Ball head; 434. Assembly frame; 435. Locking block; 436. Locking groove. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0019] Example 1 This application discloses a jacking support for the construction of steel box girders. (Refer to...) Figures 1-3 The jacking support for steel box girder construction includes a main frame 1. The main frame 1 consists of steel pipe piles 11, pile foundations 12, and steel columns 13, arranged from bottom to top. In this application, one main frame 1 corresponds to each inner and outer bend of the same row of steel box girders. Each main frame 1 has four steel pipe piles 11 and four steel columns 13. Multiple scissor braces 14 are intermittently connected from bottom to top between adjacent steel columns 13. A horizontal connecting rod 15 is connected to the end of each scissor brace 14. In addition, scissor bracing 14 and horizontal connecting rods 15 can be added according to the actual working conditions. Two longitudinal beams 21 are set on the top of the main frame 1, and a crossbeam 22 is set on the longitudinal beams 21. The jacking mechanism 3 is set on the crossbeam 22 and is used for vertical lifting and horizontal pushing of the steel box girder. The balancing mechanism 4 includes a balance block 41 slidably set on the longitudinal beam 21, a drive component 42 for driving the balance block 41 to move, and an adjustment component 43 for assembling and adjusting the moving direction of the balance block 41.

[0020] First, install the gantry crane and main frame 1 in the corresponding positions. Then, install the longitudinal beam 21, balance mechanism 4, balance block 41, cross beam 22, and jacking mechanism 3 on the main frame 1. Adjust the adjustment component 43 in advance to adjust the moving direction of the balance block 41. During the construction of the steel box girder, the guide beam and steel box girder are first hoisted onto the temporary main frame 1 using a gantry crane, and then welded together. The jacking mechanism 3 then gradually pushes the steel box girder forward. During this process, the balance block 41 is driven by the drive component 42, so that the balance block 41 has a component velocity in both the longitudinal and transverse directions. That is, during the acceleration and deceleration phases of the steel box girder, an inertial moment opposite to the direction of the inertial moment of the steel box girder is generated, thereby reducing the peak value of the instantaneous internal force transmitted to the main frame 1 to achieve inertial moment compensation and reduce the transverse bending moment on the main frame 1. In addition, with the combined action of the scissor strut 14 and the parallel connecting rod 15, the stability of the main frame 1 is greatly improved. Compared with directly over-strengthening the main frame 1, this method only requires an appropriate strengthening of the main frame 1, and has lower requirements for geological conditions and environment. The dismantling of the steel box girder after construction is also more convenient. In this invention, inertial torque compensation can be understood as compensation for the torque generated by instantaneous inertial force, or equivalently as compensation for the impulse torque generated by the change in momentum (impulse) during acceleration / deceleration. Both are used equally in the implementation of this invention for calculation and verification.

[0021] Specifically, this application preferably describes a bridge whose plane lies on a right-hand circular curve with radius R = 3000m. The bridge is a (57+4×90+57)m continuous steel box girder bridge, and the steel pipe piles 11 are Φ820. 10. Steel column 13 is Φ630 10. Scissor brace 14 and tie rod 15 are 14a, and longitudinal beam 21 is 2HN700. 300, all the above specifications are in mm, and multiple stiffening plates are additionally fixed to both the crossbeam 22 and the longitudinal beam 21. The stiffening plates are 12 mm thick. Multiple ribs are fixed to both the crossbeam 22 and the longitudinal beam 21 along their lengths. The ribs are 652 mm in size. 134 12 (not shown in the figure). Before the actual jacking, a curve radius of 30,000 mm is simulated using the actual alignment. The centerline length of the steel box girder is 474,000 mm, the length of the inner bend of the bottom plate of the steel box girder is 473,486.5 mm, and the length of the outer bend of the bottom plate of the steel box girder is 474,513.5 mm. The balance block 41 is a concrete block with various heights to correspond to various weights. The differential jacking method is adopted. The jacking mechanism 3 has a displacement of 500 mm in each horizontal direction, with a stroke of 499.458 mm at the inner bend and 500.54 mm at the outer bend. Each stroke of the jacking mechanism 3 at each inner and outer bend is a fixed value to ensure that the steel box girder follows the curve at the designed position during the jacking process.

[0022] Reference Figure 1 There are two crossbeams 22. The jacking mechanism 3 includes a slide block 31 mounted on one of the crossbeams 22, a jacking slide box 32 slidably connected to the slide block 31, and a lifting jack 33 mounted on the other crossbeam 22. The output end of the jacking slide box 32 is fixedly connected to the slide block 31. The crossbeam 22 supporting the slide block 31 has a specification of 4HN700. 300, the 33-type jack with lifting capacity is 3HN700. 300. The jacking slide box 32 consists of a box body and multiple horizontal jacks fixed inside the box body. The output end of the jacks is fixed to the slide block 31. The top of the jacking slide box 32 and the lifting jack 33 can be equipped with pads 34 according to the actual working conditions. The pads 34 can be fixed to the jacking mechanism 3, and the pads 34 can be fixed to each other by threaded connection or snap-fit. When the number of pads 34 is small, they can also be fixed by friction.

[0023] Before hoisting the steel box girder, corresponding pads 34 are installed on the top of both the jacking slide box 32 and the jacking jack 33. When jacking is performed, the jacking jack 33 is raised so that the pads 34 on the jacking jack 33 are at their highest position. Then, the steel box girder is hoisted onto the pads 34 on the jacking jack 33. The jacking jack 33 is then lowered until the steel box girder separates from the pads 34 on the jacking jack 33 and abuts against the pads 34 on the top of the jacking slide box 32. Then, the jacking slide box 32 moves on the slide block 31 via a hydraulic cylinder. During this process, the steel box girder moves horizontally. Finally, the jacking jack 33 extends and lifts the steel box girder so that the jacking slide box 32 is reset. The jacking process is stable, fast, and relatively simple in structure.

[0024] Reference Figure 3 The adjusting assembly 43 includes guide rails 431 mounted on the two longitudinal beams 21, multiple bolts 432 threaded onto the guide rails 431, ball heads 433 mounted on the bolts 432, an assembly frame 434 slidably connected to the guide rails 431, and a connector for connecting the balance block 41 to the assembly frame 434. The bolts 432 pass through the guide rails 431 and are evenly distributed on both sides of the guide rails 431. The guide rails 431 have inclined surfaces corresponding to the ball heads 433, with the inclined surfaces gradually decreasing in distance from the guide rails 431 from top to bottom. The ball heads 433 can be rotatably connected to the bolts 432 or fixedly connected to the bolts 432. If a fixed connection is used, the structure is simple and reliable. If a rotatable connection is used, such as fixing two limiting rings at both ends of the ball heads 433 to the bolts 432, with an end face bearing fixed to the end of the limiting rings near the ball heads 433, it is easier to tighten the bolts 432, but the reliability is not as good as the fixed connection.

[0025] When the direction of the guide rail 431 needs to be adjusted, first loosen the bolts 432 on one side of the guide rail 431, and then tighten the bolts 432 on the other side to the corresponding pitch. This causes the ball head 433 to press down on the inclined surface inside the guide rail 431. Because the ball head 433 on each bolt 432 on the same side presses down to different depths with the inclined surface inside the guide rail 431, the direction of the guide rail 431 in the horizontal plane changes. Finally, tightening the bolts 432 that were loosened first completes the direction adjustment of the guide rail 431, that is, it changes the angle between the moving direction of the push-pull slide box 32 and the moving direction of the assembly frame 434. The adjustment method is simple and the guide rail 431 has high stability.

[0026] Reference Figure 3 The connecting parts are locking blocks 435 fixed to both sides of the balance block 41. The inner peripheral wall of the assembly frame 434 has a locking groove 436 that is adapted to the locking blocks 435 for insertion. Several lifting rings 411 are fixed to the top of the balance block 41. When the balance block 41 is assembled into the assembly frame 434, the adjacent balance blocks 41 fit together. Before installing the crossbeam 22, the lifting rings 411 are hooked by a crane / gantry crane / electric hoist to lift the balance block 41 into the assembly frame 434, and the locking blocks 435 are inserted into the locking grooves 436. During this process, the total weight borne by the assembly frame 434 is changed by changing the number of balance blocks 41 in the assembly frame 434, thereby changing the inertia generated by the assembly frame 434. This adjustment method is simple and low in cost.

[0027] Reference Figure 1 and Figure 2 The drive assembly 42 includes two support frames 421 fixed to both ends of the longitudinal beam 21, an active rope 422 connected to the jacking mechanism 3, a driven rope 423 connected to the assembly frame 434, a movable pulley group 424 connected to the active rope 422, and two fixed pulleys 425 rotatably connected to the support frames 421. The other end of the driven rope 423 is also connected to the support frame 421. The heights of the two fixed pulleys 425 are the same as the connection points between the driven rope 423 and the assembly frame 434, and between the active rope 422 and the jacking slide box 32, respectively. In this application, the support frame 421 includes a horizontal bar and a vertical bar. The horizontal bar is inserted into the gap at the end of the longitudinal beam 21 and fixed by threaded connection or welding. The horizontal bar is HN600. 200 steel. The movable pulley block 424 includes a pulley frame 4241 and several movable pulley bodies 4242. The pulley frame 4241 is fixedly connected to the driving rope 422, and the driven rope 423 is wound around the movable pulley body 4242. Multiple movable pulley bodies 4242 can be arranged coaxially side by side to change the stroke conversion ratio. For ease of illustration, the attached drawings of this application only show two movable pulley bodies 4242 of a movable pulley block 424.

[0028] When the push-pull slide box 32 is pushed forward, it pulls the active rope 422 on the back side of the push-pull slide box 32 in the forward direction. The active rope 422 drives the pulley frame 4241 to move. The movable pulley group 424 pulls the driven rope 423 to move. After the driven rope 423 is reversed by the fixed pulley 425, it drives the assembly frame 434 to move. The longitudinal direction of the assembly frame 434 is opposite to the direction of the push-pull slide box 32. The assembly frame 434 then drives another driven rope 423 to move, which in turn drives another movable pulley group 424 to move. When the push-pull slide box 32 is reset, it pulls the active rope 422 on the back side of the push-pull slide box 32 in the reset direction, which in turn drives the assembly frame 434 to reset. The structure is simple and stable. The moment of inertia is proportional to both speed and mass. Although the total weight of the assembly frame 434 and the counterweight 41 is still less than the weight borne by the corresponding jacking slide box 32, the variable speed structure of the moving pulley block 424 enables the assembly frame 434 to have a speed several times higher than that of the jacking slide box 32, thereby increasing the moment of inertia generated by the assembly frame 434 and reducing the overturning moment transmitted to the main frame 1 when the steel box beam is jacked.

[0029] The implementation principle of a jacking support for steel box girder construction according to an embodiment of this application is as follows: When performing jacking operations, the jacking jack 33 is first raised so that the pad 34 on the jacking jack 33 is at its highest position. Then, the steel box girder is hoisted onto the pad 34 on the jacking jack 33. The jacking jack 33 is then lowered until the steel box girder disengages from the pad 34 on the jacking jack 33 and abuts against the pad 34 on the top of the jacking slide box 32. Then, the jacking slide box 32 moves on the slide block 31 via a hydraulic cylinder. During this process, the jacking slide box 32 pulls the active rope 422 on the back side of the jacking slide box 32 in the forward direction. The active rope 422 drives the pulley frame 4241 to move, and the movable pulley block 424 pulls the driven rope 42. 3. Movement: After the driven rope 423 changes direction via the fixed pulley 425, it drives the assembly frame 434 to move. The longitudinal direction of the assembly frame 434 is opposite to the direction of the jacking slide box 32. The assembly frame 434 then drives another driven rope 423 to move, which in turn drives another movable pulley group 424 to move. This allows the balance block 41 to have component velocities in both the longitudinal and transverse directions. That is, during the acceleration and deceleration phases of the steel box girder, it generates an inertial moment opposite to the direction of the inertial moment of the steel box girder. This reduces the peak value of the instantaneous internal force transmitted to the main frame 1, thereby achieving inertial moment compensation and reducing the transverse bending moment on the main frame 1. Finally, the lifting jack 33 extends and lifts the steel box girder, allowing the jacking slide box 32 to reset, and the next round of jacking can begin.

[0030] Example 2 This application discloses a construction method for a jacking support for steel box girder construction, referring to... Figures 1-3 The construction method for the jacking support used in the construction of steel box girders includes the following steps: S1. Construction of the main frame 1: steel pipe piles 11 are buried at the designated location, pile bases 12 are welded on the steel pipe piles 11, steel columns 13 are erected and welded on the pile bases 12, scissor braces 14 and horizontal connecting rods 15 are welded or threaded between the steel columns 13, and longitudinal beams 21 are welded on two adjacent steel columns 13 in the same longitudinal direction. S2. Install the balancing mechanism 4. Place the guide rail 431 on the longitudinal beam 21, fix the guide rail 431 with bolts 432 and adjust the direction of the guide rail 431. Then place the assembly frame 434 on the guide rail 431 and install the support frame 421 on the longitudinal beam 21. Then hoist the balance block 41 into the assembly frame 434. Install the driven rope 423 on the fixed pulley 425 of the support frame 421. Wrap the moving pulley group 424 around the driven rope 423. Fix the two ends of the driven rope 423 to the assembly frame 434 and the support frame 421 respectively. S3. Install the jacking mechanism 3. Install two crossbeams 22 on the longitudinal beam 21. Place the sliding block 31 and the lifting jack 33 on the two crossbeams 22 respectively. Connect the active rope 422 to the jacking slide box 32 and test and run the jacking mechanism 3.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A jacking support for steel box girder construction, characterized in that: include: Main frame (1); Two longitudinal beams (21) are provided on the top of the main frame (1), and a crossbeam (22) is provided on the longitudinal beams (21); The jacking mechanism (3) is installed on the crossbeam (22) and is used for vertical lifting and horizontal pushing of the steel box girder; The balancing mechanism (4) includes a balancing block (41) slidably disposed on the longitudinal beam (21), a driving component (42) for driving the balancing block (41) to move, and an adjusting component (43) for assembling and adjusting the moving direction of the balancing block (41).

2. The jacking support for steel box girder construction according to claim 1, characterized in that: The adjustment assembly (43) includes a guide rail (431) disposed on the two longitudinal beams (21), a plurality of bolts (432) threadedly connected to the guide rail (431), a ball head (433) disposed on the bolt (432), an assembly frame (434) slidably connected to the guide rail (431), and a connector for connecting the balance block (41) and the assembly frame (434). The bolt (432) passes through the guide rail (431) and is evenly distributed on both sides of the guide rail (431). The guide rail (431) is provided with an inclined surface corresponding to the ball head (433), and the inclined surface is inclined in a way that gradually decreases in distance from the guide rail (431) from top to bottom.

3. The jacking support for steel box girder construction according to claim 2, characterized in that: The drive assembly (42) includes a support frame (421) fixed to the longitudinal beam (21), an active rope (422) connected to the jacking mechanism (3), a driven rope (423) connected to the assembly frame (434), a movable pulley group (424) connected to the active rope (422), and a plurality of fixed pulleys (425) arranged on the support frame (421). The fixed pulleys (425) are used to reverse the direction of the driven rope (423), and the other end of the driven rope (423) is also connected to the support frame (421).

4. The jacking support for steel box girder construction according to claim 3, characterized in that: The movable pulley block (424) includes a pulley frame (4241) and a plurality of movable pulley bodies (4242). The pulley frame (4241) is fixedly connected to the driving rope (422), and the driven rope (423) is wound around the movable pulley body (4242).

5. A jacking support for steel box girder construction according to claim 2, characterized in that: The connector is a locking block (435) fixed to both sides of the balance block (41), and the inner peripheral wall of the assembly frame (434) is provided with a locking groove (436) that is compatible with the locking block (435) for insertion.

6. The jacking support for steel box girder construction according to claim 2, characterized in that: The top of the balance block (41) is fixed with several lifting rings (411). When the balance block (41) is assembled into the assembly frame (434), the two adjacent balance blocks (41) fit together.

7. The jacking support for steel box girder construction according to claim 1, characterized in that: There are two crossbeams (22). The jacking mechanism (3) includes a slide (31) on one of the crossbeams (22), a jacking slide box (32) slidably connected to the slide (31), and a jacking jack (33) on the other crossbeam (22). The output end of the jacking slide box (32) is fixedly connected to the slide (31).

8. A construction method for a jacking support for steel box girder construction, based on the jacking support for steel box girder construction according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Construction of the main frame (1): The main frame (1) is constructed at the designated location, and longitudinal beams (21) are erected on the main frame (1). S2. The balancing mechanism (4) is installed. An adjustment component (43) is installed on the longitudinal beam (21), and then a drive component (42) is installed on the main frame (1). Finally, a balance block (41) of the corresponding weight is assembled on the adjustment component (43). S3. Install the jacking mechanism (3), install the crossbeam (22) on the longitudinal beam (21), install the jacking mechanism (3) on the crossbeam (22), and debug and run the jacking mechanism (3).

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