Steel box girder beam dropping construction system and construction method

Abstract

The application discloses a steel box girder falling girder construction system and a construction method, and relates to the technical field of bridge construction. The steel box girder falling girder construction system comprises a pier and a first support; a plurality of first cushion blocks in a stacked manner are arranged on a jack on the top surface of the first support; a plurality of second cushion blocks in a stacked manner are arranged on the support on the top surface of the pier; the system further comprises a through vertical rod for inserting and connecting all the second cushion blocks, the through vertical rod being capable of being vertically arranged in a walking channel of an operation platform beside the pier; the second cushion blocks are capable of being horizontally rotated into the walking channel, and then falling to the bottom of the walking channel and being arranged in a stacked manner. The application realizes the integration of all the second cushion blocks, which can simultaneously remove all the second cushion blocks from the bridge hole (in combination with a transverse moving vehicle), and conveniently lift all the second cushion blocks to the top of the corresponding support (in combination with the first stud) when the next girder falling operation is performed; finally, the repeated transportation in the construction process is reduced, and the operation steps are simplified.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a steel box girder lowering construction system and method. Background Technology

[0002] Steel box girders are core components of long-span bridges. They typically require lateral jacking into place before being lowered into position until they are stably pressed onto the piers. During this lowering process, spacers are used; multiple spacers are stacked on top of the piers.

[0003] By removing the pads (between the steel box girder and the pier) one by one from top to bottom, the steel box girder can be supported step by step as it falls.

[0004] In traditional techniques, the pad blocks (located between the steel box girder and the pier) are manually removed and then transported outside the bridge opening using a suspended conveying system for centralized storage. However, since there are multiple pad blocks, they need to be transported one by one after being removed, which leads to repetitive operations and cumbersome steps. Furthermore, the pre-installation, fixing, and subsequent dismantling of the suspended conveying system also require additional time and manpower, which further increases the number of operational steps and reduces construction efficiency. Summary of the Invention

[0005] In order to overcome the problem of "repetitive operation and cumbersome steps in the individual conveying of pad blocks" in the above-mentioned background technology, the present invention provides a steel box girder lowering construction system and construction method.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: The steel box girder lowering construction system includes a pier and a first support set below the steel box girder; a jack is installed on the top surface of the first support, and the top of the jack is provided with a plurality of first pads stacked in a layered manner; a support is provided on the top surface of the pier, and a plurality of second pads stacked in a layered manner are provided on the top surface of the support; it also includes a through-post for inserting and connecting all the second pads in series, the through-post being able to be erected in the walking passage of the operating platform next to the pier; the second pads are able to rotate around the through-post as a center and slide along the axial direction of the through-post; the second pads located between the support and the steel box girder are able to rotate laterally into the walking passage, and then fall to the bottom of the walking passage and are arranged in a layered manner.

[0007] As a further optimization of the present invention, the through-pole can be compressed by the steel box girder to adapt and shorten; the second pad blocks are rotated out one by one from bottom to top between the support and the steel box girder to make way for the descent of the top of the through-pole and to realize the sequential stacking of the second pad blocks after they fall.

[0008] As a further optimization of the present invention, the second pad has a horizontal strip structure and a rectangular cross-section; the through rod is inserted at a right angle at the tail end of the second pad.

[0009] As a further optimization of the present invention, the second pad has a rectangular plate structure; the through rod is inserted at a right angle at the tail end of the second pad.

[0010] As a further optimization of the present invention, the top and bottom ends of the through pole are respectively provided with stop cylinders for stopping the second pad block.

[0011] As a further optimization of the present invention, a traverse vehicle is provided in the walking channel, and the lifting plate of the traverse vehicle is used to receive the falling second pad block; a clamping structure is installed on the chassis of the traverse vehicle, and the clamping structure is used to clamp and fix the bottom end of the through pole and the stop cylinder located below.

[0012] As a further optimization of the present invention, the clamping structure includes a clamping block and a second hydraulic cylinder for applying a pushing or pulling force to the clamping block; the clamping block is provided in two parts and can be respectively disposed on both sides of the bottom end of the through-pole; the clamping block is provided with a first V-shaped groove for adapting to clamp the through-pole and a second V-shaped groove for adapting to clamp the stop cylinder.

[0013] As a further optimization of the present invention, a horizontal insert rod is inserted into the second pad block. The horizontal insert rod can extend from the tail end face of the second pad block to transmit torque to the second pad block, so that the front end of the second pad block rotates from above the pier into the walking channel.

[0014] As a further optimization of the present invention, five second pads are provided. The first second pad at the top is provided with a first screw hole; the first second pad at the bottom is provided with a second screw hole; the three second pads in the middle are respectively provided with clearance through holes; when the two ends of the first stud are screwed to the first screw hole and the second screw hole respectively, and the middle part passes through the three clearance through holes, all the second pads can be hoisted at the same time using the first stud; when all the second pads are hoisted upwards at the same time using the first stud, the through rod slides downwards relative to the second pads under its own weight.

[0015] The steel box girder lowering construction method involves using a steel box girder lowering construction system for the steel box girder lowering operation. The steps include: S1, the traversing vehicle loaded with the second pad blocks travels along the walking channel to the side of the support; S2, all the second pad blocks are hoisted and stacked on the support, and the through-pole is erected in the walking channel, with the bottom end of the through-pole fixedly connected to the traversing vehicle; S3, after the steel box girder is pushed into place, the jack and the first pad blocks are installed; S4, the steel box girder is lowered step by step, while the first pad blocks and the second pad blocks are removed one by one; the removal steps for the second pad blocks are: first, rotate horizontally by 90 degrees to enter the walking channel, and then lower it onto the lifting plate; S5, the traversing vehicle loaded with the second pad blocks travels along the walking channel until it exits the bridge arch.

[0016] In summary, the present invention has at least one of the following advantages: (1) The present invention integrates all the second pads, which can remove all the second pads from the bridge hole at the same time (requires the use of a transverse transfer vehicle), avoiding the tedious operation of lifting them one by one (using a suspension conveyor system); it can also conveniently lift all the second pads to the corresponding support at the same time during the next beam lowering operation (requires the use of a first stud), avoiding the tedious steps of lifting and placing them one by one; finally, it reduces the repetitive steps in the construction process, simplifies the operation procedures, and improves the convenience and efficiency of the operation.

[0017] (2) Compared with the suspended conveyor system, the traverse vehicle can function without pre-installation, fixing and dismantling. It can travel freely in the passageway inside the bridge hole, which further simplifies the construction steps and improves the convenience of operation.

[0018] (3) After several second pads are screwed out and dropped one by one, they can be stacked in the original order at the bottom of the walking channel (i.e., no additional stacking or sorting is required). Then, the first stud can be used to lift all the second pads at the same time, further simplifying the operation steps.

[0019] (4) The through-pole can be passively shortened as the steel box girder descends, which on the one hand avoids the descent of the steel box girder being hindered, and on the other hand avoids the through-pole from bending due to overload caused by the weight of the steel box girder. The second pad blocks are screwed out one by one from bottom to top between the support and the steel box girder to make way for the descent of the top of the through-pole (after the first second pad block at the bottom is screwed out, a gap appears between the bottom surface of the second second pad block at the bottom and the top surface of the support, which provides a space for the overall descent of the remaining second pad blocks at this gap position, as well as a space for the descent of the top of the through-pole and the stop cylinder above it).

[0020] (5) The lifting plate can support the second pad block upward and control the second pad block to descend slowly, avoiding impact damage caused by the free fall of the second pad block (which will damage itself, the transverse vehicle and the operating platform), thereby improving the service life of the present invention.

[0021] (6) The lifting side plate abuts and guides the falling second pad, so that all the second pads stacked at the bottom of the walking channel can be automatically aligned from a top view, thereby achieving automatic alignment of the first screw hole, the second screw hole and the clearance through hole. When installing the first stud and the second pad, there is no need to manually adjust the position of the second pad (for the alignment of the first screw hole, the second screw hole and the clearance through hole), thus further simplifying the operation steps.

[0022] (7) Stop cylinders are installed at both ends of the through pole. The stop cylinders are used to prevent the second pad from falling off the through pole and to prevent the bottom end of the through pole from separating from the clamping structure when the second pad is lifted upward (when the second pad is lifted upward, the second pad applies an upward frictional force to the through pole, causing the through pole to tend to move upward; however, the first V-groove of the clamping block can be adapted to clamp the bottom end of the through pole, and the second V-groove of the clamping block can be adapted to clamp the stop cylinder at the bottom end of the through pole. The first V-groove and the second V-groove form a clamping cavity with a convex cross section, thereby preventing the clamping structure from separating from the through pole / stop cylinder), which improves the stability of the invention. It can also improve the verticality of the through pole in the upright position, prevent it from tilting, and improve the smoothness of construction.

[0023] (8) If the horizontal insert can be pulled out from the second pad, the user can apply a pushing / pulling force to the end of the horizontal insert away from the second pad, which can drive the second pad to rotate more easily. If the end of the second horizontal insert at the bottom can be hung on the guardrail, the rotation of the first horizontal insert at the bottom will not drive the second horizontal insert at the bottom (and the horizontal inserts above it) to rotate, reducing the number of nodes that the user needs to manually operate, thereby improving the convenience of construction.

[0024] (9) The electric winch inside the transverse moving vehicle can pull down the end of the second transverse insert rod (away from the second pad) at the bottom, so that the end of the second pad away from the transverse insert rod at the bottom is slightly tilted upward, thereby reducing the friction between the first pad at the bottom and the second pad at the bottom, thus reducing the difficulty for the user to drive the first pad at the bottom to rotate, which has the technical advantages of reducing manpower and improving construction convenience. Attached Figure Description

[0025] The present application will be further explained below with reference to the accompanying drawings: Figure 1 This is a front view schematic diagram of the overall structure of the present invention; Figure 2A front view diagram showing the positions of the first and second pad blocks; Figure 3 Right view diagram showing the position of the first pad block; Figure 4 Right view diagram showing the position of the second pad; Figure 5 A front view diagram of the steel box girder unloading state (I); Figure 6 A front view diagram of the steel box girder unloading process (II); Figure 7 A front view diagram of the steel box girder unloading process (Part 3); Figure 8 A front view diagram of the steel box girder unloading state (IV); Figure 9 A top-down view of the installation status of the through-pole; Figure 10 This is a front-view diagram showing the rotation state of the first and second pads at the bottom. Figure 11 A front view schematic diagram of the top of the steel box girder press-fitted through-pole; Figure 12 A top-view diagram showing the rotating state of the first and second pads at the bottom; Figure 13 This is a front view diagram of the vertical section of the through-pole structure; Figure 14 This is a right-side view of the position and structure of the lateral moving vehicle; Figure 15 This is a schematic diagram showing the position of the clamping structure and a top-down view of the structure. Figure 16 This is a schematic diagram of the clamping block structure viewed from an angle. Figure 17 A top-view cross-section of the first V-groove clamping the through-pole; Figure 18 A top-view cross-section of the cylinder holding the stop in the second V-groove clamping position. Figure 19 This is a top view of the position of the horizontal insertion rod and the cross section of the structure. Figure 20 A top view of the horizontal insertion rod in its extended and rotated state; Figure 21 A front view of the vertical section showing the connection state of the first stud with the first and second threaded holes; Figure 22 A front view diagram showing the position of the lifting side panel; Figure 23 A right-side sectional view of the connection structure between the lifting side panel and the side-mounted structure; Figure 24 This is a right-side view of the steel box girder with the second anti-friction wheel in place.

[0026] Explanation of reference numerals in the attached figures: In the picture, 1. Piers; 11. Load-bearing columns; 12. Cap beams; 2. First support frame; 21. Tracked jacking device; 3. Jack; 4. First pad block; 5. Support; 6. Second pad; 60. Vertical insertion hole; 600. Chamfered structure; 601. First screw hole; 602. Second screw hole; 603. Clearance through hole; 604. First stud; 605. Hanging ring; 61. First blind hole; 62. Horizontal insertion rod; 621. Hook; 7. Steel box girder; 70. Bridge opening; 71. Guide beam; 8. Through-pole; 801. Stop cylinder; 802. Cap; 803. Second anti-friction wheel; 81. Vertical insertion rod; 811. Plunger; 812. Outward expansion; 8121. Second guide cone; 82. Hollow rod; 821. First guide cone; 83. First compression spring; 9. Operating platform; 90. Traveling aisle; 901. Lateral movement vehicle; 9011. Lifting plate; 90111. Lifting side plate; 90112. Side column; 90113. Second compression spring; 90114. Guide hole; 90115. Spring hole; 90116. First ring body; 90117. First friction-reducing wheel; 9012. Chassis; 9013. Wheel; 9014. First hydraulic cylinder; 9015. Clamping structure; 90151. Clamping block; 90152. First hydraulic cylinder; 90153. First V-groove; 90154. Second V-groove; 91. Traveling base; 92. Guardrail; 93. Diagonal brace; 6a. The first second pad at the bottom; 6b. The second second pad at the bottom; 62a, the first horizontal insert at the bottom; 62b, the second horizontal insert at the bottom. Detailed Implementation

[0027] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows: Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment provides a steel box girder lowering construction system, including piers 1, first supports 2, jacks 3, first pads 4, supports 5, second pads 6, and a steel box girder 7. Several piers 1 are provided; a pier 1 is located below each end of the steel box girder 7 (after it is jacked into place) (this pier 1 is the first pier 1 beside the opening 70), and these two piers 1 are used for the lowering construction of the steel box girder 7.

[0028] Reference Figures 1 to 8 Several first supports 2 (e.g., a frame structure spliced ​​from steel pipes, channel steel, and I-beams) are provided; a first support 2 is provided below each end of the steel box girder 7 (after being pushed into place) (this first support 2 is the first first support 2 beside the bridge opening 70). A jack 3 is installed on the top surface of the first first support 2 beside the bridge opening 70, and several first pads 4 are stacked on the top of the jack 3 (e.g., pressed layer by layer by its own weight, so as to facilitate removal); the housing of the jack 3 is detachably connected to the first support 2 (e.g., fixed by bolts), and the first pads 4 are pressed against the top end face of the output shaft of the jack 3. A support 5 is provided on the top surface of the first pier 1 beside the bridge opening 70; the pier 1 is a reinforced concrete structure; the support 5 is a reinforced concrete structure. The pier 1 includes a load-bearing column 11 and a cap beam 12, the bottom end of the load-bearing column 11 is anchored to the foundation, and the top end is anchored to the cap beam 12. The support 5 is fixedly connected (e.g., anchored) or pressed to the top surface of the cap beam 12. The top surface of the support 5 (specifically the top surface of the cap beam 12) is provided with a plurality of second pads 6 in a stacked manner.

[0029] Reference Figure 9 , Figure 10 and Figure 11 It also includes a through-post 8 for inserting and connecting all the second pads 6, the through-post 8 being able to be erected in the walking passage 90 of the operating platform 9 on the side of the pier 1 (specifically the side of the cap beam 12); the operating platform 9 is connected to the foundation by an independent support, or is fixedly connected to the cap beam 12 (and the load-bearing column 11) (e.g., anchored or clamped).

[0030] Reference Figure 10 The operating platform 9 includes a walking base 91, a guardrail 92, and diagonal braces 93. The walking base 91 is horizontally positioned beside the cap beam 12. The diagonal braces 93 are located below the walking base 91, with one end fixedly connected to the walking base 91 (e.g., detachably connected by bolts) and the other end anchored to the cap beam 12. The guardrail 92 and the cap beam 12 are located on opposite sides of the walking base 91, and the guardrail 92 is vertically connected to the walking base 91 (e.g., detachably connected by bolts). A walking passage 90 is located above the walking base 91 and between the cap beam 12 and the guardrail 92.

[0031] Reference Figure 10 and Figure 12 The second pad 6 can rotate around the through pole 8 and slide along the axis of the through pole 8; the second pad 6 located between the pier 1 and the steel box girder 7 (and arranged along the length of the steel box girder 7) can rotate laterally (around the through pole 8) into the walking channel 90, and then fall (along the axis of the through pole 8) to the bottom of the walking channel 90 and be arranged in a stacked manner.

[0032] Reference Figure 11The second pad 6 is provided with a vertical insertion hole 60, and the through rod 8 is inserted into the vertical insertion hole 60 with a clearance fit, so that the second pad 6 and the through rod 8 can rotate and slide relative to each other. The through rod 8 has a (straight) round rod structure and passes through the vertical insertion holes 60 of all the second pads 6 in sequence. The through rod 8 plays a guiding role for the falling second pads 6, so that the second pads 6, which were originally stacked, remain stacked after falling one by one; this technical solution realizes the integration of all the second pads 6, which can remove all the second pads 6 from the bridge opening 70 at the same time (requiring the use of the transverse moving vehicle 901), avoiding the cumbersome operation of lifting them one by one (using the suspension conveyor system), and can also conveniently lift all the second pads 6 to the corresponding support 5 at the same time during the next beam lowering operation (requiring the use of the first stud 604), avoiding the cumbersome steps of lifting and placing them one by one; ultimately, it reduces the overall operation steps and improves the convenience and efficiency of the operation.

[0033] Reference Figure 10 and Figure 19 The second pad 6 has a horizontal (straight) strip structure and a rectangular cross-section; the through rod 8 is inserted at a right angle at the tail end of the second pad 6. Combined with... Figure 11 The second strip-shaped pad 6 can be stacked in layers on one side of the bottom of the walking channel 90 after rotating and falling, so that the other side of the walking channel 90 can still be used by operators, thereby improving the convenience of construction.

[0034] Referring to Figure 12, the second pad 6 has a rectangular plate-like structure (and is a straight plate); the through-post 8 is inserted into the right-angle position at the tail end of the second pad 6. The rectangular plate-like second pad 6 can be stacked in layers at the bottom of the walking channel 90 after rotation and falling.

[0035] Reference Figure 11 and Figure 12 The rectangular plate-shaped second pad 6 has a larger contact area with the steel box girder 7 and the support 5, thus distributing the weight of the steel box girder 7 and reducing the pressure on the rectangular plate-shaped second pad 6. This results in a smaller number of pads required (e.g., one set of second pads 6 at each end of a cap beam 12; where one set of second pads 6 includes five pads 6), reducing operational steps. The strip-shaped second pad 6 has a smaller contact area with the steel box girder 7 and the support 5, resulting in a greater pressure load. Therefore, a larger number of pads are required (e.g., four sets of second pads 6 need to be installed on a cap beam 12; where one set of second pads 6 includes five pads 6). This is to distribute pressure, reduce stress, increase service life, and lower the probability of safety accidents caused by overload deformation of the second pad 6.

[0036] Reference Figure 11 and Figure 13The through-post 8 has stop cylinders 801 at both its top and bottom ends to stop the second pad 6. The stop cylinders 801 are fixedly connected to the ends of the through-post 8 (e.g., by bolts). The two stop cylinders 801 limit the second pad 6 to the outer periphery of the through-post 8, preventing it from detaching and thus avoiding the problem of the second pad 6 falling off. The diameter of the stop cylinders 801 is larger than the (maximum) diameter of the through-post 8. The vertical insertion holes 60 of the first second pad 6 at the top and the first second pad 6a at the bottom are countersunk holes, used to accommodate the two stop cylinders 801 respectively. Since the stop cylinders 801 are coaxially arranged with the through-post 8, they can rotate smoothly within the countersunk holes.

[0037] Reference Figure 11 and Figure 13 The through-pole 8 can be compressed by the steel box girder 7 to shorten (i.e., the through-pole 8 can extend and retract, thereby avoiding interference between the top of the through-pole 8 and the bottom surface of the steel box girder 7, thus avoiding the problem of deformation due to overload and improving the service life of the invention); during the gradual descent of the steel box girder 7, its bottom surface can press against the stop cylinder 801 at the top of the through-pole 8, thereby driving the through-pole 8 to shorten. The through-pole 8 includes a vertical insertion rod 81, a hollow rod 82, and a first compression spring 83; the vertical insertion rod 81, the hollow rod 82, and the first compression spring 83 are coaxially arranged; one end of the vertical insertion rod 81 is fixedly connected to the stop cylinder 801, and the other end is inserted into the inner cavity of the hollow rod 82 (and slidably connected); the first compression spring 83 is disposed in the inner cavity of the hollow rod 82 and one end abuts against the end face of the inner cavity of the hollow rod 82, and the other end abuts against the plunger 811; the plunger 811 is disposed in the inner cavity of the hollow rod 82 and is fixedly connected to the end of the vertical insertion rod 81 (e.g., (Fixed by bolts); the plunger 811 is cylindrical and its diameter is larger than the diameter of the opening at the end of the hollow rod 82, thereby preventing the hollow rod 82 at the end of the vertical rod 81 from coming out of the cavity; the plunger 811 can slide axially along the cavity of the hollow rod 82; under the push of the first compression spring 83, the through rod 8 has a tendency to elongate, so that the top of the through rod 8 (the top surface of the stop cylinder 801) can always abut against the bottom surface of the steel box girder 7 (i.e., the height position of the first second pad 6 at the top).

[0038] The second pad 6 and the through pole 8 can be rotated 180 degrees vertically (to improve construction convenience). When the vertical insertion pole 81 is above the hollow pole 82: refer to... Figure 11 and Figure 13The end of the hollow rod 82 away from the vertical insertion rod 81 is fixedly connected to another stop cylinder 801 (e.g., by bolts). A first guide cone surface 821 is provided on the end face of the hollow rod 82 near the vertical insertion rod 81. The first guide cone surface 821 adapts to the chamfered structure 600 at the bottom of the insertion holes of the second pad 6, guiding the falling second pad 6 and preventing it from being jammed by the end face of the hollow rod 82 and thus difficult to fall. When the vertical insertion rod 81 is below the hollow rod 82, the end face of the hollow rod 82 will not obstruct the falling of the second pad 6.

[0039] Reference Figure 10 and Figure 11 The second pad 6 is rotated out one by one from bottom to top between the support 5 and the steel box beam 7 to make way for the descent of the top of the through pole 8 (after the first second pad 6a at the bottom is rotated out, a gap appears between the bottom surface of the second second pad 6b at the bottom and the top surface of the support 5, providing space for the overall descent of the remaining second pad 6 at this gap position, and also providing space for the descent of the top of the through pole 8 and the stop cylinder 801 above it), and to realize the sequential stacking of the second pad 6 after it falls (the arrangement order of the second pad 6 fitted on the same through pole 8 cannot be changed, so the first second pad 6a at the bottom must be rotated out and fall, then the second second pad 6b at the bottom, then the third second pad 6 at the bottom, then the second second pad 6 at the top, and finally the first second pad 6 at the top, in order to avoid structural interference and complete the sequential stacking of all pads in the walking channel 90).

[0040] Reference Figure 14 and Figure 15 A transverse transfer vehicle 901 is installed within the walking channel 90 of the steel box girder 7. The transverse transfer vehicle 901 can travel back and forth along the length direction (i.e., the width direction of the steel box girder 7) within the walking channel, thereby transporting the second pad block 6 to the required position or removing it from the bridge opening 70. The transverse transfer vehicle 901 replaces the overhead conveying system to realize the function of transporting the second pad block 6: on the one hand, it does not require additional installation (while the overhead conveying system requires fixed connection to the brackets set on the outside of the bridge opening 70 at both ends), which can reduce the operation steps of the operator; on the other hand, it can realize the simultaneous transport of the entire group of second pad blocks 6, without the need for individual, sequential hoisting and transport, which further reduces the operation steps of the operator; therefore, the present invention has higher construction convenience.

[0041] Reference Figure 14The traverse vehicle 901 includes a horizontally positioned lifting plate 9011, a horizontally positioned chassis 9012 located below the lifting plate 9011, rotatable wheels 9013 mounted on the lower surface of the chassis 9012, and a first hydraulic cylinder 9014 for driving the lifting plate 9011 to rise and fall. The top end of the first hydraulic cylinder 9014 is hinged to the lifting plate 9011, and the bottom end is hinged to the chassis 9012. The first hydraulic cylinders 9014 are arranged in pairs, with the two pairs of first hydraulic cylinders 9014 arranged in an X-shape; when the two pairs of first hydraulic cylinders 9014 extend and retract synchronously, they can drive the lifting plate 9011 to rise and fall. The lifting plate 9011 and the chassis 9012 are connected by several pairs of first hydraulic cylinders 9014, thereby achieving stable support for the lifting plate 9011. Wheel 9013 has a locking function to prevent unnecessary movement of the traverse vehicle 901 when receiving the falling second pad 6; for example, a self-locking roller can be used; or it can be connected to the drive motor through a reducer, the reducer can be connected to a worm gear reducer, the output shaft of the drive motor can be connected to the worm, and the wheel axle of wheel 9013 can be connected to the worm gear. In this way, the drive motor can drive the worm to rotate, which in turn drives the worm gear and the vehicle to rotate, thereby driving the traverse vehicle 901 to move; however, wheel 9013 and worm gear cannot drive the worm to rotate, thus preventing the vehicle from slipping.

[0042] Reference Figure 14 The traverse vehicle 901 is positioned within the travel passage 90, near the pier 1 (i.e., the cap beam 12). The lifting plate 9011 of the traverse vehicle 901 is used to catch the falling second pad 6 (if the second pad 6 falls freely, it will impact and damage the travel base 91 of the operating platform 9; even if the travel base 91 is punctured, it could cause a safety accident). The lifting plate 9011 can control the slow descent of the second pad 6. The lifting plate 9011 can descend in stages; for example, when the top surface of the lifting plate 9011 is slightly lower than the top surface of the cap beam 12, the first second pad 6a at the bottom can be stably dropped onto the top surface of the lifting plate 9011 after being unscrewed; when a second pad 6 is placed on the top surface of the lifting plate 9011, and the top surface of this second pad 6 is slightly lower than the top surface of the cap beam 12, the second second pad 6b at the bottom can be stably dropped onto the top surface of the second pad 6 on the top surface of the lifting plate 9011, and so on.

[0043] Reference Figure 14 and Figure 15A clamping structure 9015 is mounted on the top surface of the chassis 9012 of the traverse vehicle 901. The clamping structure 9015 is used to clamp and fix the bottom end of the through-post 8 and the stop cylinder 801 located below it, thereby keeping the through-post 8 vertical. The clamping structure 9015 includes a clamping block 90151 and a second hydraulic cylinder for applying a pushing or pulling force to the clamping block 90151. The housing of the second hydraulic cylinder is fixedly connected to the chassis 9012 (e.g., by bolts), and the output shaft of the second hydraulic cylinder is fixedly connected to the clamping block 90151 (e.g., by bolts). The second hydraulic cylinder is used to drive the clamping block 90151 to move laterally, thereby achieving the clamping and releasing of the through-post 8 / stop cylinder 801. Two clamping blocks 90151 are provided and can be respectively located on both sides of the bottom end of the through pole 8; two second hydraulic cylinders are provided and can be respectively located on both sides of the bottom end of the through pole 8; the second hydraulic cylinder is used to drive the clamping block 90151 on the same side to move laterally.

[0044] Reference Figure 16 , Figure 17 and Figure 18 The clamping block 90151 is provided with a first V-shaped groove 90153 for adapting to clamp the through-through rod 8 and a second V-shaped groove 90154 for adapting to clamp the stop cylinder 801. The two first V-shaped grooves 90153 clamp the through-through rod 8 from the left and right sides to achieve clamping and fixing of the through-through rod 8; the two second V-shaped grooves 90154 clamp the stop cylinder 801 from the left and right sides to achieve clamping and fixing of the stop cylinder 801; so as to prevent the through-through rod 8 from tipping over and improve the stability of the invention in use.

[0045] The clamping block 90151 is connected to the chassis 9012 via a ball linear guide pair, thereby avoiding overload damage to the clamping block 90151 and the output shaft of the second hydraulic cylinder.

[0046] When a user stands within the walking aisle 90, it is difficult to grasp the front end of the second pad 6 (due to insufficient arm span). However, grasping the rear end of the second pad 6 presents a challenge in driving (including pushing / pulling) the second pad 6 to rotate as a whole (due to the force-consuming lever structure present here). To solve this problem, refer to... Figure 19 and Figure 20 A horizontal rod 62 is inserted into the second pad 6. The horizontal rod 62 can extend from the tail end of the second pad 6 to transmit torque to the second pad 6, so that the front end of the second pad 6 can rotate from above the pier 1 into the walking channel 90. During operation, the operator pulls out the horizontal rod 62, then grasps the end of the horizontal rod 62 (away from the second pad 6) and pushes / pulls it, which makes it easier to drive the second pad 6 to rotate. After the second pad 6 falls above the lifting plate 9011, the horizontal rod 62 is reinserted into the first blind hole 61 to avoid the problem of the horizontal rod 62 occupying the space of the walking channel 90 and improve the convenience of construction.

[0047] Reference Figure 19 The second pad 6 has a first blind hole 61. One end (and middle part) of the horizontal insertion rod 62 is adapted to be inserted into the first blind hole 61, and the other end is placed outside the second pad 6 (thus avoiding the user from gripping or pulling it outward). The length direction of the first blind hole 61 is set along the length direction of the second pad 6, so the horizontal insertion rod 62 can slide along the length direction of the second pad 6 to achieve insertion and removal. After the horizontal insertion rod 62 is partially pulled out from the first blind hole 61, the user can grasp the end of the horizontal insertion rod 62 (away from the second pad 6) and apply a pulling / pushing force to drive the horizontal insertion rod 62 (centered on the penetrating pole 8) to rotate; compared with the solution of directly pulling / pushing the tail end of the second pad 6 to drive the front end of the second pad 6 to rotate, it has a more labor-saving technical effect.

[0048] Correspondingly, when the user grasps and pushes / pulls the end of the first horizontal insert 62a at the bottom (away from the first second pad 6a at the bottom), the first second pad 6a at the bottom can be driven to rotate as a whole until it rotates out from between the support 5 and the steel box girder 7.

[0049] There is friction between the first bottom second pad 6a and the support 5, and there is also friction between the first bottom second pad 6a and the second bottom second pad 6b. Therefore, when the first bottom second pad 6a rotates, it easily causes the second bottom pad to rotate synchronously, resulting in the remaining second pads 6b rotating unnecessarily. To avoid this problem, refer to... Figure 20 A tension spring is installed inside the first blind hole 61, and the tension spring is arranged along the length direction of the first blind hole 61. One end of the tension spring is hooked to the end face of the first blind hole 61, and the other end is hooked to the end face of the horizontal insertion rod 62. A hook 621 (e.g., a self-locking hook) is installed at the end of the horizontal insertion rod 62 away from the tension spring. (Under the synergistic action of the tension spring) the hook 621 at the end of the second horizontal insertion rod 62b at the bottom can be hooked and pulled to the guardrail 92 on the side of the walking passage 90, thereby driving the second second pad 6b at the bottom to maintain a perpendicular state to the guardrail 92 (i.e., maintain a state set along the length direction of the steel box beam 7), thus avoiding the problem of the first second pad 6a at the bottom driving the second second pad 6b at the bottom to rotate. This operation mode has the technical advantages of being simple, convenient, and easy to operate. The tension spring can also be used to realize the automatic retraction of the horizontal insertion rod 62.

[0050] Reference Figure 20The height of the top of the guardrail 92 is adapted to the height of the second horizontal bar 62b at the bottom. When the horizontal bar 62 is pulled into the guardrail 92, the end of the horizontal bar 62 away from the second pad 6 is tilted downward, thereby driving the end of the second pad 6b (and the second pad 6 above) away from the walking channel 90 to be slightly raised upward (a gap is required between the second pad 6 and the through pole 8), thereby reducing the pressure and friction between the first second pad 6a and the second second pad 6b at the bottom (making it easier to push manually), and making it easier to rotate the first second pad 6a at the bottom. An electric winch is installed on the top surface of the chassis 9012. The casing of the electric winch is fixedly connected to the chassis 9012 by bolts. The end of the cable of the electric winch is equipped with a hook. When the hook is hung on the hook 621, the electric winch can reel in the cable, thereby pressing down the end of the horizontal bar 62 away from the second pad 6, and then slightly raising the end of the second pad 6 away from the walking channel 90. Afterwards, the user hangs the hook 621 on the guardrail 92 (for fixation and load bearing) and removes the hook from the hook 621.

[0051] Reference Figure 21 A set of five second pads 6 are provided, namely the first second pad 6 at the top, the second second pad 6b at the bottom, the third second pad 6 at the bottom, the second second pad 6 at the top, and the first second pad 6 at the top. The first second pad 6b at the top (center position) is provided with a first screw hole 601; the first second pad 6b at the bottom (center position) is provided with a second screw hole 602 (the direction of its thread is the same as the direction of the thread of the first screw hole 601); the three second pads 6 located in the middle position are respectively provided with clearance through holes 603 at their own center positions; when the first stud 604 is screwed to the first screw hole 601 and the second screw hole 602 at both ends and passes through the three clearance through holes 603 in the middle, all the second pads 6 can be hoisted at the same time using the first stud 604. When the second pads 6 in the same group are aligned (from a top-down view), the first screw hole 601, the second screw hole 602, and the clearance through hole 603 are coaxially arranged. At this time, the user can vertically screw the first stud 604 into the second pad 6 in the group, and the first screw hole 601 and the second screw hole 602 respectively engage the two ends of the first stud 604. Then, by lifting the first stud 604 upward, all the second pads 6 in the group can be lifted upward simultaneously (and then placed on the support 5 for beam lowering operations at the next construction node).

[0052] Reference Figure 21When all the second pads 6 are lifted upwards simultaneously using the first stud 604, the through-post 8 slides downwards relative to the second pads 6 under its own weight (to accommodate the traverse vehicle 901 with a constant height). A lifting ring 605 is fixedly installed at the top of the first stud 604 (e.g., by welding or by an integral fixed connection); the hook of the lifting equipment (e.g., a crawler crane) can be hooked onto the lifting ring 605 to lift the first stud 604.

[0053] Reference Figure 22 The lifting plate 9011 is provided with a lifting side plate 90111 on the side away from the pier 1; the lifting side plate 90111 is arranged in an L-shape or T-shape with the lifting plate 9011; the lifting side plate 90111 is used to laterally abut against the second pad 6 that is limited to falling, so that the second pad 6 stacked on the lifting plate 9011 (as far as possible in a top view) is aligned, even if the first screw hole 601, the second screw hole 602 and the clearance through hole 603 (as far as possible) are in a coaxial state, the user can directly install the first stud 604 without readjusting the position of the second pad 6, which simplifies the operation steps.

[0054] Reference Figure 22 and Figure 23 The height of the top of the lifting platform is matched with the height of the first second pad 6a at the bottom. The lifting platform can be lowered by the steel box girder 7 to avoid overload bending. A side column 90112 is inserted into the lifting platform, and the bottom end of the side column 90112 is vertically fixed to the chassis 9012 (e.g., by bolts); the side column 90112 and the lifting platform are connected by a second compression spring 90113. When the second compression spring 90113 only bears the weight of the lifting platform, the height of the top of the lifting platform is matched with the height of the first second pad 6a at the bottom, and the top edge of the lifting platform is lower than the first horizontal insert 62a at the bottom, which is used to limit the falling second pad 6a without hindering the extension and retraction of the horizontal insert 62.

[0055] Reference Figure 22 and Figure 23The lifting platform has a guide hole 90114 and a spring hole 90115 coaxially arranged and connected to the guide hole 90114. The bottom end of the guide hole 90114 and the spring hole 90115 are connected in a stepped manner. Both the guide hole 90114 and the spring hole 90115 are vertically arranged. The guide hole 90114 is located above the spring hole 90115. The top of the lateral column is inserted into the guide hole 90114 and can slide relative to it. The middle part of the side column 90112 is inserted through the spring hole 90115. The first compression spring 83 is arranged in the spring hole 90115 and sleeved on the outer periphery of the side column 90112. A first ring 90116 is provided at the lower part of the spring hole 90115. The first ring 90116 is fixedly sleeved on the outer periphery of the side column 90112 (e.g., by bolt connection); the diameter of the spring hole 90115 is larger than the diameter of the guide hole 90114; the top end of the first compression spring 83 abuts against the top surface of the spring hole 90115, and the bottom end abuts against the top surface of the first ring 90116. The first compression spring 83 is used to push the lifting plate upward to reset after the downward pressure of the steel box girder 7 is removed. An end cap is installed at the bottom opening of the spring hole 90115. The end cap is annular and fixedly connected to the lifting side plate 90111 by bolts; the end cap is used to prevent the first ring 90116 from coming out of the spring hole 90115.

[0056] Reference Figure 23 The top of the lifting platform is equipped with a rotatable first anti-friction wheel 90117. After the steel box girder 7 is lowered, the bottom surface of the steel box girder 7 presses against the first anti-friction wheel 90117 (under the drive of the second compression spring 90113, the first anti-friction wheel 90117 elastically abuts against the bottom surface of the steel box girder 7). At this time, the lateral moving vehicle 901 needs to move laterally out of the bridge opening 70. During this process, the first anti-friction wheel 90117 can avoid the problem of friction between the top surface of the lifting side plate 90111 and the bottom surface of the steel box girder 7 (by avoiding contact between the top surface of the lifting side plate 90111 and the bottom surface of the steel box girder 7, and changing sliding to rolling), thereby improving the smoothness of the lateral moving vehicle 901 and reducing the construction difficulty.

[0057] Reference Figure 24The cap 802 can be placed on the top of the through pole 8. The top of the cap 802 is equipped with a rotatable second friction-reducing wheel 803, which is used to reduce the friction between the top of the through pole 8 and the bottom of the steel box girder 7 during lateral movement. After the steel box girder 7 is lowered, the second friction-reducing wheel 803 elastically abuts against the bottom surface of the steel box girder 7 (driven by the first compression spring 83). At this time, the lateral moving vehicle 901 and the through pole 8 need to move laterally out of the bridge opening 70. During this process, the second friction-reducing wheel 803 can avoid the problem of friction between the upper stop cylinder 801 and the bottom surface of the steel box girder 7 (by avoiding contact between the stop cylinder 801 and the steel box girder 7, and changing sliding to rolling), thereby improving the smoothness of the lateral moving vehicle 901 and reducing the construction difficulty. When the user grasps the upper part of the through pole 8 and presses down until there is a gap between the upper stop cylinder 801 and the steel box girder 7 that is large enough to accommodate the height of the cap 802, the cap 802 can be placed on the top of the through pole 8.

[0058] Reference Figure 20 The first blind hole 61 is located beside the vertical insertion hole 60; that is, the horizontal insertion rod 62 is located beside the through rod 8, thereby avoiding interference.

[0059] The first hydraulic cylinder 9014 is connected to the oil tank via the first hydraulic pump (and oil supply pipe); the second hydraulic cylinder is connected to the oil tank via the second hydraulic pump (and oil supply pipe); the first hydraulic pump, the second hydraulic pump and the oil tank are all installed inside the transverse transfer vehicle 901 (for example, fixedly connected to the chassis 9012 by bolts).

[0060] Each group has five first pad blocks.

[0061] The present invention also includes an electrical cabinet, which is fixedly installed in the transverse trolley 901 by bolts (for example, fixedly connected to the chassis 9012 by bolts); the first hydraulic pump, the second hydraulic pump, the electric winch, and the drive motor are respectively connected to the electrical cabinet by wires and signal lines; the electrical cabinet is connected to the external power supply and the external controller (for example, a computer or a PLC programmable logic controller) by wires and signal lines, and the external controller controls the start and stop and other working states of the first hydraulic pump, the second hydraulic pump, the electric winch, and the drive motor in the present invention through the electrical cabinet.

[0062] The drive motor is a controllable motor (such as a servo motor or a stepper motor). An external controller inputs electrical signals to the controllable motor, which can control the speed, number of revolutions per rotation, angle of rotation per rotation, and start and stop timing of the controllable motor.

[0063] Both the first pad 4 and the second pad 6 adopt a box-shaped structure and are made of titanium alloy, which has the technical advantages of being lightweight and high-strength, thereby improving the convenience of construction and making it easy to operate.

[0064] The bottom end of the through pole 8 can be permanently fixed to the transverse transfer vehicle 901 (for example, by bolt fixing, rather than by clamping structure 9015), which avoids the steps of repeatedly disassembling and reassembling the bottom end of the through pole 8 to the transverse transfer vehicle 901, thereby simplifying the operation steps and improving the convenience of operation.

[0065] Reference Figure 13 The outer wall of the end of the vertical rod 81 away from the hollow rod 82 is provided with an expansion portion 812; the expansion portion 812 is cylindrical in shape and is fixedly connected to the vertical rod 81 (for example, by bolt or by an integral fixed connection); the outer diameter of the expansion portion 812 is equal to the outer diameter of the hollow rod 82, and both can be adapted and clamped by the first V-groove 90153; then, regardless of which end of the through rod 8 points downward (during transportation, in some cases, to improve convenience, the through rod 8 needs to be disassembled from the transverse moving vehicle 901 before transportation; after arriving at the construction site, the through rod 8 is re-erected on the transverse moving vehicle 901, at which point it is not necessarily that which end of the through rod 8 points downward and is clamped and fixed by the clamping structure 9015), that end can be stably clamped by the clamping structure 9015, thereby improving the convenience of construction.

[0066] Reference Figure 13 The outer expansion portion 812 is provided with a second guide cone surface 8121 near the end face of the hollow rod 82. The second guide cone surface 8121 is adapted to the chamfer structure 600 at the end of the vertical insertion hole 60 to guide the falling second pad 6, so as to avoid the problem of the second pad 6 being stuck by the end face of the outer expansion portion 812 when it falls, and improve the smoothness of operation.

[0067] The steel box girder lowering construction method, which involves using a steel box girder lowering construction system to lower the steel box girder, includes the following steps: S1. The traverse vehicle 901, loaded with the second pad 6, travels along the travel passage 90 to the side of the support 5.

[0068] S2. (Using the first stud 604) hoist all the second pad blocks 6 and place them in a stacked manner on the support 5, with the through-post 8 erected in the travel passage 90, and the bottom end of the through-post 8 fixedly connected to the transverse moving vehicle 901 (maintained). At this time, since the steel box girder 7 has not been pushed above the bridge opening 70, the second pad blocks 6 can be hoisted conveniently (that is, the top of the bridge opening 70 is open, allowing the slings of the crawler crane to pass through vertically).

[0069] After the steel box girder 7 is pushed into place, install the jack 3 and the first pad block 4.

[0070] S4. Lower the steel box girder 7 step by step, while removing the first pad 4 and the second pad 6 one by one. The removal steps for the second pad 6 are as follows: first rotate it horizontally by 90 degrees to enter the walking channel 90, and then lower it onto the lifting plate 9011.

[0071] S5. The traverse vehicle 901, loaded with the second pad block 6, travels along the passageway 90 until it exits the underpass 70.

[0072] In step S3, the specific steps for jacking up the steel box girder 7 include: M1. The steel box girder 7 is hoisted and placed on the crawler-type jacking device 21 at the top of the first support 2 using a crawler crane, with the steel box girder 7 located on one side of the bridge opening 70.

[0073] M2. The guide beam 71 is hoisted and placed on the crawler-type jacking device 21 at the top of the first support 2 using a crawler crane, with the two ends of the guide beam 71 located on both sides of the bridge opening 70.

[0074] M3. Connect the end of the steel box girder 7 to the end of the guide beam 71 (e.g., by bolting or welding).

[0075] M4 drives the tracked jacking device 21 to push the steel box girder 7 and guide beam 71 to move laterally until the steel box girder 7 moves above the bridge opening 70, with both ends of the steel box girder 7 located on both sides of the bridge opening 70.

[0076] M5. Disconnect the ends of the steel box girder 7 and the guide beam 71 (e.g., by removing bolts or by flame cutting); then remove the guide beam 71 using a crawler crane.

[0077] In step S4, the specific driving steps for the steel box girder 7 to fall in stages are as follows: A1. The lifting cylinder inside the tracked jacking device 21 installed on the top surface of the first support 2 retracts until the bottom surface of the steel box girder 7 presses against the second pad 6, and the top surface of the tracked jacking device 21 separates from the bottom surface of the steel box girder 7 (refer to...). Figure 5 Then remove the tracked jacking device 21.

[0078] A2. Using jack 3, lift the first pad block 4 until the steel box girder 7 is pressed against the first pad block 4, and the top second pad block 6 (top surface) is detached from the steel box girder 7 (bottom surface). Then remove one second pad block 6 (refer to...). Figure 6 ).

[0079] A3. Jack 3 retracts until the steel box girder 7 presses against the second pad 6, and the first pad 4 (top surface) separates from the steel box girder 7 (bottom surface). Then remove one of the first pads 4 (refer to...). Figure 7 ).

[0080] A4. Repeat steps A2 to A3 until the steel box girder 7 is pressed onto the support 5 and the output shaft of the jack 3 is disengaged from the bottom surface of the steel box girder 7 (refer to...). Figure 8 ); A5. Remove the jack 3.

[0081] This invention has a simple structure and reliable function. It integrates all the second pads 6, and can remove all the second pads 6 from the bridge opening 70 at the same time (requiring the use of the transverse moving vehicle 901), avoiding the tedious operation of lifting them one by one (using the suspension conveyor system). It can also conveniently lift all the second pads 6 to the corresponding support 5 at the same time during the next beam lowering operation (requiring the use of the first stud 604), avoiding the tedious steps of lifting and placing them one by one. Ultimately, it reduces repetitive steps in the construction process, simplifies the operation procedures, and improves the convenience and efficiency of the operation.

Claims

1. A steel box girder lowering construction system, characterized in that: It includes a pier (1) and a first support (2) set below the steel box girder (7); a jack (3) is installed on the top surface of the first support (2), and the top of the jack (3) is provided with a number of first pads (4) stacked in a layered manner; a support (5) is provided on the top surface of the pier (1), and a number of second pads (6) stacked in a layered manner are provided on the top surface of the support (5). It also includes a through pole (8) for inserting and connecting all the second pads (6), the through pole (8) being able to be erected in the walking channel (90) of the operating platform (9) next to the pier (1); the second pads (6) being able to rotate around the through pole (8) and slide along the axial direction of the through pole (8); the second pads (6) located between the support (5) and the steel box girder (7) being able to rotate laterally into the walking channel (90), and then fall to the bottom of the walking channel (90) and be arranged in a stacked manner.

2. The steel box girder lowering construction system according to claim 1, characterized in that: The through-pole (8) can be compressed by the steel box girder (7) to adapt and shorten; the second pad (6) is rotated out one by one from bottom to top between the support (5) and the steel box girder (7) to make way for the descent of the top of the through-pole (8) and to realize the sequential stacking of the second pad (6) after it falls.

3. The steel box girder lowering construction system according to claim 2, characterized in that: The second pad (6) has a horizontal strip structure and a rectangular cross section; the through rod (8) is inserted at a right angle at the tail end of the second pad (6).

4. The steel box girder lowering construction system according to claim 2, characterized in that: The second pad (6) has a rectangular plate structure; the through rod (8) is inserted at a right angle at the tail end of the second pad (6).

5. The steel box girder lowering construction system according to any one of claims 3 or 4, characterized in that: The top and bottom ends of the through pole (8) are respectively provided with stop cylinders (801) for stopping the second pad block (6).

6. The steel box girder lowering construction system according to claim 5, characterized in that: The walking channel (90) is provided with a transverse moving vehicle (901), and the lifting plate (9011) of the transverse moving vehicle (901) is used to receive the falling second pad block (6); a clamping structure (9015) is installed on the chassis (9012) of the transverse moving vehicle (901), and the clamping structure (9015) is used to clamp and fix the bottom end of the through pole (8) and the stop cylinder (801) located below.

7. The steel box girder lowering construction system according to claim 6, characterized in that: The clamping structure (9015) includes a clamping block (90151) and a second hydraulic cylinder for applying a pushing or pulling force to the clamping block (90151); the clamping block (90151) is provided in two parts and can be disposed on both sides of the bottom end of the through rod (8); the clamping block (90151) is provided with a first V-groove (90153) for adapting to clamp the through rod (8) and a second V-groove (90154) for adapting to clamp the stop cylinder (801).

8. The steel box girder lowering construction system according to claim 7, characterized in that: A horizontal rod (62) is inserted into the second pad (6). The horizontal rod (62) can extend from the tail end face of the second pad (6) to transmit torque to the second pad (6) so that the front end of the second pad (6) can rotate from above the pier (1) into the walking channel (90).

9. The steel box girder lowering construction system according to claim 8, characterized in that: Five second pads (6) are provided. The first second pad (6) at the top is provided with a first screw hole (601); the first second pad (6) at the bottom is provided with a second screw hole (602); the three second pads (6) in the middle position are respectively provided with clearance through holes (603); the two ends of the first stud (604) are respectively screwed to the first screw hole (601) and the second screw hole (602), and when the middle part passes through the three clearance through holes (603), all the second pads (6) can be hoisted at the same time using the first stud (604). When all the second pads (6) are lifted upwards simultaneously using the first stud (604), the through rod (8) slides downwards relative to the second pads (6) under its own weight.

10. A method for lowering steel box girders, characterized in that, The steel box girder (7) lowering operation is carried out using the steel box girder lowering construction system described in claim 9, and the steps include: S1. The traverse vehicle (901) loaded with the second pad (6) travels along the travel channel (90) to the side of the support (5); S2. All the second pads (6) are hoisted and stacked on the support (5), and the through pole (8) is erected in the walking channel (90), and the bottom end of the through pole (8) is fixedly connected to the transverse vehicle (901). S3. After the steel box girder (7) is pushed into place, install the jack (3) and the first pad (4). S4. The steel box girder (7) is lowered step by step, and the first pad (4) and the second pad (6) are removed one by one. The removal steps of the second pad (6) are as follows: first rotate it horizontally by 90 degrees to enter the walking channel (90), and then lower it onto the lifting plate (9011). S5. The traverse vehicle (901) loaded with the second pad (6) travels along the travel channel (90) until it exits the bridge hole (70).

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