A sliding structure for steel box girder installation and a construction method thereof

Abstract

The present application relates to a kind of sliding structure for steel box girder installation and its construction method, including track being arranged on sliding beam, clamping seat and slide shoe being respectively slidably arranged on the track, respectively with the clamping seat and the slide shoe hinged crawling oil cylinder, clamping mechanism being arranged in the clamping seat and being used to control the locking state of the clamping seat and the track, control mechanism being arranged in the slide shoe and being used to control the sliding distance of the slide shoe;With computer displacement follow-up synchronous control, with the start mode of hierarchical loading, combined with twice differentiating travel correction algorithm, the travel deviation of multiple groups of sliding structure is quickly converged, and the synchronization error is eliminated;The overall structure of the present application is firm, convenient to disassemble and maintain, has strong automatic correction ability, can realize the stable, high-precision long-distance sliding of steel box girder, reduces the cost of manual intervention, adapts to large-tonnage steel box girder installation construction, and has strong versatility.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a sliding structure for installing steel box girders and its construction method. Background Technology

[0002] Currently, in the construction of steel box girder bridges, the sliding jacking method is commonly used to complete the placement and installation of the girder. Most existing sliding jacking structures use hydraulic cylinder jacking structures with fixed strokes, which are simple in structure but have poor adjustment capabilities. When multiple sets of sliding devices are constructed simultaneously, stroke deviations are prone to occur, which can lead to long-term accumulation and cause the steel box girder to shift and twist, resulting in low precision in construction synchronization control. At the same time, traditional sliding clamping structures have poor self-locking stability, are prone to slippage and lateral movement during the sliding process, and have weak resistance to eccentric loads. Moreover, conventional sliding mechanisms cannot correct the sliding stroke in real time according to errors, and mostly rely on manual fine-tuning for correction, which is cumbersome and inefficient, making it difficult to meet the construction requirements of high-precision and stable sliding of large-tonnage, long-distance steel box girders. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the existing technology, the present invention aims to provide a sliding structure for steel box girder installation and its construction method.

[0004] The technical solution adopted in this invention is as follows: A sliding structure for installing a steel box girder includes a track on the sliding beam, a clamping seat and a sliding shoe slidably mounted on the track, a crawling cylinder hinged to the clamping seat and the sliding shoe, a clamping mechanism disposed inside the clamping seat and used to control the locking state of the clamping seat and the track, and a control mechanism disposed inside the sliding shoe and used to control the sliding distance of the sliding shoe. The clamping mechanism includes a wedge block disposed inside the clamping seat. When the piston rod of the crawling cylinder extends, the wedge block squeezes the track to lock the two together. When the piston rod of the crawling cylinder retracts, the two are unlocked. The control mechanism includes a lead screw 1 rotatably mounted on the inner wall of the slipper, a control block threadedly engaged with the lead screw 1, and a sliding seat detachably mounted on the control block and slidably connected to the side wall of the slipper. The sliding seat is hinged to one end of the crawling cylinder. By controlling the movement of the control block, the height of the sliding seat relative to the slipper is changed, thereby controlling the single sliding distance of the slipper.

[0005] Advantageously, the track includes an integrally formed base plate, top plate, and web plate. Multiple pressure plates are provided at equal intervals on both sides of the base plate along the length of the track. The pressure plates are fixedly connected to the base plate and the sliding beam, respectively. A first sliding groove is formed on the side of the clamping seat near the track, and the first sliding groove cooperates with the top plate. A second sliding groove is formed on the side of the sliding shoe near the track, and the second sliding groove cooperates with the track.

[0006] Advantageously, the sliding shoe is fixedly provided with two bottom skids located on both sides of the track at one end near the track, and a side skid is fixedly provided on the side of the two bottom skids that are far away from each other. The second sliding groove is located between the two bottom skids. A pad is fixedly provided on the side of the sliding shoe that is far away from the track.

[0007] Advantageously, the clamping seat has a through hole three at the end away from the track, which penetrates the inner wall of the clamping seat. The clamping mechanism also includes a square pin one fixedly disposed in the through hole three and a cylindrical pin one fixedly disposed at the end of the square pin one near the track. The wedge block has a through groove in the middle and a through hole four penetrating the through groove on the side of the wedge block. The square pin one corresponds to the through groove, and the cylindrical pin one is rotatably engaged with the through hole four.

[0008] Advantageously, each side of the first slide groove is provided with a floating groove that penetrates the inner wall of the clamping seat. A floating block is slidably provided in each floating groove. A floating seat located outside the clamping seat is fixed on one side of each floating block. The floating seat near the side of the slipper is hinged to one end of the crawling cylinder.

[0009] Advantageously, the floating block is slidably mounted on the cylindrical pin two, with both ends of the cylindrical pin two fixedly connected to the inner wall of the clamping seat. A floating spring is provided on each side of the floating block, with one end of the floating spring abutting against the floating block and the other end of the floating spring abutting against the inner wall of the clamping seat. A mounting groove is provided on each side of the multiple floating blocks that are close to each other. A synchronization frame is provided inside the clamping seat, with multiple ends of the synchronization frame being detachably mounted in the multiple mounting grooves. A clamping groove is fixedly provided at the middle position of the synchronization frame near the track. A transmission rod is provided on each side of the clamping groove, and a through hole five is provided at the end of the transmission rod. Multiple wedge blocks are provided, with a cylindrical pin three fixedly provided on each side of each wedge block. The through hole five is rotatably engaged with the cylindrical pin three.

[0010] Advantageously, the control mechanism further includes a control motor, a mounting plate fixedly connected to the control motor, a cylindrical pin four fixedly connected to the mounting plate and the inner wall of the slipper respectively, a drive pulley fixedly mounted on the output shaft of the control motor, and a reduction pulley driven by a synchronous belt, the reduction pulley being fixedly mounted at one end of the lead screw.

[0011] As a preferred embodiment of the present invention, an adjusting block is slidably provided on the side of the control block near the clamping seat. Wave grooves are respectively provided on the sides of the adjusting block and the control block that are close to each other. An adjusting motor is provided on one side of the adjusting block and is fixedly connected to the inner wall of the slipper. A second lead screw is fixedly provided on the output shaft of the adjusting motor. The second lead screw is threadedly engaged with the adjusting block. The axes of the second lead screw and the first lead screw are perpendicular to each other. An inclined groove is fixedly provided on the side of the adjusting block away from the control block. A positioning groove is provided on one side of the adjusting block and the control block respectively. An electromagnetic switch is fixedly provided on one inner wall of the slipper. A square pin is fixedly provided at one end of the electromagnetic switch. The square pin engages with the two positioning grooves.

[0012] As a preferred embodiment of the present invention, the inner wall of the sliding shoe near the clamping seat is provided with a sliding groove three, and the sliding seat is fixedly provided with a sliding plate on the side away from the clamping seat. The sliding seat passes through the sliding groove three and is slidably connected to the sliding groove three. The sliding plate is located inside the sliding shoe, and a plurality of sliding columns are fixedly provided at the end of the sliding plate away from the sliding seat. The plurality of sliding columns are slidably connected to the inclined groove respectively.

[0013] A construction method for a sliding structure used in the installation of a steel box girder includes the following steps: S1. Construction preparation: Erect the sliding support system and sliding beam, clear the sliding channel, complete the measurement and layout positioning, lay two tracks as described, and install two sets of the sliding structure as described under the target steel box girder, with two in each set; S2. The jacking and sliding mechanism is controlled synchronously by a computer. It has a master command point and a slave command point. Synchronous jacking is achieved in a displacement following mode. The clamping seat clamps the rail to form a self-locking mechanism. The crawling cylinder extends to push the steel box girder forward by one stroke. When the cylinder retracts, the clamping seat releases the rail and resets. The jacking stroke is executed cyclically. Sliding is started by a graded loading method. The ideal stroke is set to L. S3. Measurement error: Mark the current cycle as the first cycle. During the first cycle, compare the difference between the actual stroke and the ideal stroke L of the two sets of sliding structures. Select the smaller difference as the standard stroke l1 and the larger difference as the stroke to be adjusted l2. The single stroke difference x = + (l1 - l2) is obtained. If x is greater than the set parameter, proceed to step S4; otherwise, proceed to step S5. S4. Correcting parameters: In the second cycle, for a set of sliding structures corresponding to the stroke l2 to be adjusted, the height of the sliding seat is adjusted by the control mechanism to control the stroke of the sliding shoe, so that l2'=l2-2(l1-l2), l1'=l1; In the third and subsequent cycles, l2''=l2-(l1-l2), l1''=l1; S5. Repeat the push-up process. In subsequent cycles, repeat steps S2 and S3. S6. Replacement support installation: After the steel box girder slides into place, the elevation and plane position of the steel box girder are finely adjusted by three-way jacks and matched with the previous section of steel box girder. Replacement support short rods are then installed on the sliding beam below the steel box girder. After the replacement support is completed, other operations are carried out on the steel box girder.

[0014] The beneficial effects of this invention are as follows: As a sliding structure and construction method for steel box girder installation, this invention sets up a sliding and pushing unit composed of a clamping seat, a sliding shoe, and a crawling cylinder. Combined with the wedge blocks inside the clamping mechanism, it achieves self-adaptive mechanical self-locking, eliminating the need for manual locking, providing strong clamping stability, effectively preventing slippage and backward movement, and improving construction safety. The sliding shoe has an internal control mechanism that uses multi-stage screw transmission to adjust the height of the sliding seat, changing the position of the cylinder hinge fulcrum, precisely controlling the single sliding stroke, and resulting in a compact adjustment structure and high transmission accuracy. A synchronous frame, floating springs, and floating blocks are used to synchronously clamp multiple sets of wedge blocks, ensuring uniform force distribution, buffering and offsetting lateral stress, and reducing structural wear and jamming. Computer displacement following synchronous control, combined with a graded loading start mode and two differentiated stroke correction algorithms, quickly converges the stroke deviations of multiple sets of sliding structures, eliminating synchronization errors. This invention has a robust overall structure, is easy to disassemble and maintain, has strong automated correction capabilities, and can achieve stable, high-precision, long-distance sliding of steel box girders, reducing manual intervention costs. It is suitable for the installation and construction of large-tonnage steel box girders and has strong versatility. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0016] Figure 1 This is an exploded structural diagram of the present invention; Figure 2 This is the present invention. Figure 1 A schematic diagram of the clamping mechanism; Figure 3 This is the present invention. Figure 1 A schematic diagram of the control mechanism structure; Figure 4 This is the present invention. Figure 1 A schematic diagram of the assembly structure; Figure 5 This is the present invention. Figure 4 A cross-sectional structural diagram. Detailed Implementation

[0017] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0018] Combination Figures 1-5A sliding structure for installing a steel box girder includes a track 26 mounted on a sliding beam, a clamping seat 14 and a sliding shoe 21 slidably mounted on the track 26, a crawling cylinder 25 hinged to the clamping seat 14 and the sliding shoe 21, a clamping mechanism 15 disposed inside the clamping seat 14 and used to control the locking state of the clamping seat 14 and the track 26, and a control mechanism 17 disposed inside the sliding shoe 21 and used to control the sliding distance of the sliding shoe 21. The clamping mechanism 15 includes a wedge block 40 disposed inside the clamping seat 14. When the piston rod of the crawling cylinder 25 extends, the wedge block 40 presses the track 26 to lock the two together. When the piston rod of the crawling cylinder 25 retracts, the two together unlock. The control mechanism 17 includes a lead screw 43 rotatably mounted on the inner wall of the slipper 21, a control block 53 threadedly engaged with the lead screw 43, and a sliding seat 16 detachably mounted on the control block 53 and slidably connected to the side wall of the slipper 21. The sliding seat 16 is hinged to one end of the crawling cylinder 25. By controlling the movement of the control block 53, the height of the sliding seat 16 relative to the slipper 21 is changed, thereby controlling the single sliding distance of the slipper 21. The control mechanism 17 inside the slipper 21 uses the lead screw 43 as the transmission core. Through the threaded transmission of the lead screw, the control block 53 is driven to move horizontally, which in turn adjusts the vertical height of the sliding seat 16, changes the hinged fulcrum position of the crawling cylinder 25, and precisely controls the single sliding stroke. The sliding stroke can be mechanically adjusted through the control mechanism 17, solving the problems of fixed sliding and pushing stroke, poor synchronization, and insufficient locking stability in traditional steel box girder sliding and pushing systems. It has a high degree of automation and is adaptable to different sliding construction conditions.

[0019] Advantageously, the track 26 includes an integrally formed base plate, top plate, and web plate. Multiple pressure plates 24 are evenly spaced on both sides of the base plate along the length of the track 26. The pressure plates 24 are fixedly connected to the base plate and the sliding beam, respectively. A first groove 11 is formed on the side of the clamping seat 14 near the track 26, and the first groove 11 cooperates with the top plate. A second groove 57 is formed on the side of the sliding shoe 21 near the track 26, and the second groove 57 cooperates with the track 26. The integral track 26 structure has strong load-bearing capacity, the uniform fixing method of the pressure plates 24 improves the laying stability of the track 26, and the nested limiting structure of the first groove 11 and the second groove 57 reduces the swaying and offset during the sliding process, ensuring smooth sliding of the steel box girder and extending the service life of the track 26 and the sliding components.

[0020] Advantageously, two bottom skids 19 are fixedly provided at one end of the slipper 21 near the track 26, respectively located on both sides of the track 26. A side skid 20 is fixedly provided on the side of the two bottom skids 19 that are far apart from each other. The second sliding groove 57 is located between the two bottom skids 19. A pad 18 is fixedly provided on the side of the slipper 21 away from the track 26. The pad 18 is fixedly mounted on the upper surface of the slipper 21. The pad 18 is made of high-strength wear-resistant alloy material and directly contacts the bottom surface of the steel box girder. The bottom skids 19 and the side skids 20 form a double anti-detachment limiting structure, which improves the sliding safety of the slipper 21. The pad 18 can distribute the heavy pressure of the steel box girder and prevent the slipper 21 from directly wearing or damaging the bottom surface of the steel box girder. It has excellent protective and load-bearing performance.

[0021] Advantageously, the clamping seat 14 has a through hole 13 penetrating the inner wall of the clamping seat 14 at one end away from the track 26. The clamping mechanism 15 also includes a square pin 27 fixedly disposed in the through hole 13 and a cylindrical pin 32 fixedly disposed at one end of the square pin 27 near the track 26. The wedge block 40 has a through groove 29 in the middle and a through hole 30 penetrating the through groove 29 on the side. The square pin 27 corresponds to the through groove 29, and the cylindrical pin 32 rotatably engages with the through hole 30. The wedge block 40 has a rectangular through groove 29 in the middle and a through hole 30 penetrating the through groove 29 on the side. During assembly, the square pin 27 is inserted into the through groove 29, and the cylindrical pin 32 is rotatably fitted into the through hole 30, allowing the wedge block 40 to rotate slightly around the cylindrical pin 32. The wedge block 40 is rotatably connected by a split pin assembly structure consisting of square pin 27 and cylindrical pin 32. This ensures that the wedge block 40 can flexibly deflect and fit the surface of the track 26 when subjected to force, thereby improving the clamping and locking fit. At the same time, the pin is detachable, which facilitates the inspection and replacement of internal parts of the clamping seat 14 in the later stage, making disassembly and maintenance convenient.

[0022] Advantageously, each side of the slide groove 11 is provided with a floating groove 12 that penetrates the inner wall of the clamping seat 14. A floating block 41 is slidably disposed in each floating groove 12, and a floating seat 31 located on the outer side of the clamping seat 14 is fixedly disposed on one side of each floating block 41. The floating seat 31 near the side shoe 21 is hinged to one end of the crawling cylinder 25. The sliding engagement between the floating block 41 and the floating groove 12 can adapt to the angular deviation caused by the extension and retraction of the crawling cylinder 25, offset the lateral stress during the mechanical transmission process, avoid hard wear at the hinge of the crawling cylinder 25, improve the transmission flexibility of the floating seat 31, and reduce the structural jamming failure rate.

[0023] Advantageously, the floating block 41 is slidably mounted on the cylindrical pin 34, with both ends of the cylindrical pin 34 fixedly connected to the inner wall of the clamping seat 14. A floating spring 35 is provided on each side of the floating block 41, with one end of the floating spring 35 abutting against the floating block 41 and the other end abutting against the inner wall of the clamping seat 14. A mounting groove 33 is provided on each side of the multiple floating blocks 41 that are close to each other. A synchronization frame 28 is provided inside the clamping seat 14, with multiple ends of the synchronization frame 28 being detachably mounted in the multiple mounting grooves 33. A clamping groove 38 is fixedly provided at the middle position of the synchronization frame 28 near the track 26. A transmission rod 37 is provided on each side of the clamping groove 38, and a through hole 36 is provided at the end of the transmission rod 37. Multiple wedge blocks 40 are provided, with a cylindrical pin 39 fixedly provided on each side of each wedge block 40. The through hole 36 is rotatably engaged with the cylindrical pin 39. An installation groove 33 is provided on the inner side of the floating block 41, and the end of the synchronization frame 28 is snapped into the installation groove 33 to achieve detachable assembly; the end of the transmission rod 37 is rotatably connected to the cylindrical pin 39 on the side of the wedge block 40 through the through hole 36, and multiple sets of wedge blocks 40 achieve linkage rotation based on the synchronization frame 28. The floating spring 35 buffer structure reduces mechanical collision loss, and the linkage structure of the synchronization frame 28 can control the synchronous clamping and loosening of multiple sets of wedge blocks 40 through the transmission rod 37 to ensure uniform clamping force, avoid unilateral squeezing and wear of the track 26, and improve the overall synchronization and stability of the clamping mechanism inside the clamping seat 14.

[0024] Advantageously, the control mechanism 17 further includes a control motor 51, a mounting plate 49 fixedly connected to the control motor 51, cylindrical pins 50 fixedly connected to the mounting plate 49 and the inner wall of the slipper 21 respectively, a drive pulley 58 fixedly mounted on the output shaft of the control motor 51, and a reduction pulley 42 driven by a synchronous belt 48. The reduction pulley 42 is fixedly mounted at one end of the lead screw 43. The drive pulley 58 is coaxially fixed to the output shaft of the control motor 51, and the reduction pulley 42 is fixed to the end of the lead screw 43. A synchronous belt 48 is sleeved between the drive pulley 58 and the reduction pulley 42 to form a pulley reduction transmission structure. By using the control motor 51 in conjunction with the synchronous belt 48 for reduction transmission, the output speed of the motor is reduced, the transmission torque of the lead screw 43 is increased, the lead screw rotation is smooth and without jamming, the displacement of the control block 53 is precisely controlled, and the damage to the internal control mechanism of the slipper 21 is reduced due to the start-stop impact of the control motor 51. The transmission accuracy is high and the noise is low.

[0025] Advantageously, an adjusting block 46 is slidably provided on the side of the control block 53 near the clamping seat 14. Wave grooves 52 are respectively provided on the sides of the adjusting block 46 and the control block 53 that are close to each other. An adjusting motor 44 is provided on one side of the adjusting block 46 and is fixedly connected to the inner wall of the slipper 21. A second lead screw 45 is fixedly provided on the output shaft of the adjusting motor 44. The second lead screw 45 is threadedly engaged with the adjusting block 46. The axes of the second lead screw 45 and the first lead screw 43 are perpendicular to each other. An inclined groove 47 is fixedly provided on the side of the adjusting block 46 away from the control block 53. A positioning groove 54 is respectively provided on one side of the adjusting block 46 and the control block 53. An electromagnetic switch 55 is fixedly provided on one inner wall of the slipper 21. A square pin 56 is fixedly provided at one end of the electromagnetic switch 55. The square pin 56 engages with the two positioning grooves 54. The electromagnetic switch 55 is fixed to the inner wall of the slipper 21, and the square pin 56 connected to its end can be extended and inserted into the positioning groove 54 to lock the control block 53 and the adjusting block 46. The lead screw 43 and the lead screw 45 are bidirectional vertical lead screws to achieve two-dimensional adjustment. The wave groove 52 improves the stability of the transmission between the control block 53 and the adjusting block 46. The electromagnetic switch 55, together with the square pin 56, achieves automatic locking, keeping the components fixed under normal conditions. When correcting deviations, it is unlocked for adjustment, taking into account both the internal structural stability of the slipper 21 and the adjustment flexibility, and accurately completing the stroke compensation correction.

[0026] Advantageously, a sliding groove 59 is provided through the inner wall of the sliding shoe 21 near the clamping seat 14. A sliding plate 23 is fixedly provided on the side of the sliding seat 16 away from the clamping seat 14. The sliding seat 16 passes through the sliding groove 59 and is slidably connected to the sliding groove 59. The sliding plate 23 is located inside the sliding shoe 21. Multiple sliding posts 22 are fixedly provided at the end of the sliding plate 23 away from the sliding seat 16. The multiple sliding posts 22 are slidably connected to the inclined groove 47 respectively. The sliding plate 23 is fixed to the inner end of the sliding seat 16. Multiple sets of sliding posts 22 are fixed in an array inside the sliding plate 23. The ends of the sliding posts 22 are embedded in the inclined groove 47 and slide along the trajectory of the inclined groove 47. Utilizing the inclined plane transmission principle of the inclined groove 47 and the sliding posts 22, the horizontal displacement of the adjusting block 46 is converted into the vertical lifting displacement of the sliding seat 16. The transmission structure is simple and compact, with high space utilization, and the displacement conversion is accurate with no transmission gap, further improving the stroke adjustment accuracy of the sliding shoe 21.

[0027] A construction method for a sliding structure used in the installation of a steel box girder includes the following steps: S1. Construction preparation: Erect the sliding support system and sliding beam, clear the sliding channel, complete the measurement and layout positioning, lay two tracks 26, and install two sets of the sliding structure under the target steel box girder, two in each set; S2. The jacking and sliding mechanism is controlled synchronously by a computer. A master and slave command point are established, and synchronous jacking is achieved in a displacement-following mode. The clamping seat 14 clamps the rail 26 to form a self-locking mechanism. The crawling cylinder 25 extends to push the steel box girder forward one stroke. When the cylinder retracts, the clamping seat 14 releases the rail 26 and resets. The jacking stroke is executed cyclically, and sliding is initiated using a graded loading method. The ideal stroke is set to L. S3. Measurement error: Mark the current cycle as the first cycle. During the first cycle, compare the difference between the actual stroke and the ideal stroke L of the two sets of sliding structures. Select the smaller difference as the standard stroke l1 and the larger difference as the stroke to be adjusted l2. The single stroke difference x = + (l1 - l2) is obtained. If x is greater than the set parameter, proceed to step S4; otherwise, proceed to step S5. S4. Correcting parameters: In the second cycle, for a set of sliding structures corresponding to the stroke l2 to be adjusted, the height of the sliding seat 16 is adjusted by the control mechanism 17 to control the stroke of the sliding shoe 21, so that l2'=l2-2(l1-l2), l1'=l1; In the third and subsequent cycles, l2''=l2-(l1-l2), l1''=l1; S5. Repeat the push-up process. In subsequent cycles, repeat steps S2 and S3. S6. Replacement support installation: After the steel box girder slides into place, the elevation and plane position of the steel box girder are finely adjusted by three-way jacks and matched with the previous section of steel box girder. Replacement support short rods are then installed on the sliding beam below the steel box girder. After the replacement support is completed, other operations are carried out on the steel box girder.

[0028] Working principle of this invention: The site was leveled and obstacles were cleared. According to the design drawings and survey results, the sliding support system and sliding beam were erected to ensure that the support system has sufficient strength, rigidity and stability to withstand the self-weight of the steel box girder, sliding load and additional forces.

[0029] The sliding channel was thoroughly cleaned to ensure that the sliding path was straight, without protrusions or blockages, thus providing smooth conditions for the continuous sliding of the steel box girder.

[0030] Total station and level were used to complete the surveying and layout, and to accurately mark the center line of the sliding track, the position of the support column, the location of the sliding shoe, and the positioning axis of the steel box girder.

[0031] Two parallel tracks 26 are laid above the sliding beam. The tracks 26 are fixed by pressure plates 24 with uniform spacing. The horizontality of the top surface of the tracks 26 and the height difference of the joints meet the design accuracy requirements. Limiting baffles are set at both ends of the tracks 26 to prevent track displacement or overtravel of the steel box girder during the sliding process.

[0032] Two sets of sliding structures are installed at the corresponding positions at the bottom of the steel box girder to be slid. Each set contains two sliding structures. The sliding shoe is reliably connected to the bottom of the steel box girder, and the bottom of the sliding shoe fits against the sliding beam to form a stable sliding support.

[0033] Complete the installation and wiring of the crawler cylinder 25, hydraulic pump station, computer synchronous control system and displacement and pressure sensors. Perform no-load debugging and pre-load check on the entire system to confirm that the equipment is operating normally and the signal feedback is accurate.

[0034] The computer synchronous control system is started, and the crawling cylinder 25 corresponding to one set of sliding structures is set as the master command point, and the crawling cylinder 25 corresponding to the other set of sliding structures is set as the slave command point. The displacement following mode is used to realize the dual-group synchronous pushing control.

[0035] The clamping mechanism 15 automatically clamps the track 26 to form a one-way self-locking mechanism, preventing backward movement during sliding. The crawling cylinder 25 extends, and the thrust along the axis of the crawling cylinder 25 is decomposed into downward and backward forces at the floating seat 31. The downward force acts on the floating seat 31, forcing it to slide downward. The floating block 41 moves with the floating seat 31, and the floating block 41 and the cylindrical pin 34 slide together. The floating spring 35 adaptively extends and retracts. The synchronous frame 28, the clamping groove 38, and the transmission rod 37 move synchronously with the floating block 41. The transmission rod 37 drives one end of the wedge block 40 to rotate around the cylindrical pin 32, causing its downward protruding part to further downward to contact the top plate of the track 26, thereby increasing the pressure between the top plate and the wedge block 40, thus increasing the friction and achieving self-locking of the clamping seat 14. The thrust is transmitted to the steel box girder through the pusher shoe 21, pushing the steel box girder forward along the track 26 by a set stroke.

[0036] After the slipper 21 is in place, the crawling cylinder 25 retracts, and the pulling force along the axis of the crawling cylinder 25 is decomposed into upward and forward forces at the floating seat 31. The same principle as above, the upward force causes the wedge block 40 to reset, and after reducing friction, the clamping seat 14 can slide freely. The forward force pulls the clamping seat 14 to reset, completing one push cycle.

[0037] The sliding start-up phase adopts a graded loading method, gradually increasing the cylinder pressure to avoid structural misalignment or equipment damage caused by instantaneous impact; the system is set to an ideal single jacking stroke of L, and propels the system in a fixed stroke cycle.

[0038] During the jacking process, the thrust, displacement, and attitude at each point are monitored in real time to ensure smooth sliding without jamming or significant deviation.

[0039] The current jacking cycle is marked as the first cycle. After the first cycle ends, the actual jacking stroke of the two sliding structures is collected by the displacement sensor.

[0040] Compare the two sets of actual strokes with the ideal stroke L set by the system, and calculate their respective deviations: select the set of actual strokes with smaller deviations as the standard stroke l1, and the set of actual strokes with larger deviations as the stroke to be adjusted l2; calculate the single stroke difference between the two sets of sliding structures x = + (l1 - l2).

[0041] Compare the travel difference x with the system's preset allowable parameter: if x is greater than the preset allowable value, it means that the two sets of sliding are not synchronized and the parameter needs to be corrected; if x is less than or equal to the preset allowable value, it means that the synchronization requirement is met and the loop push can be repeated directly.

[0042] When the stroke deviation exceeds the tolerance, the second jacking cycle is entered, and the actual jacking stroke of the set of sliding structures corresponding to the stroke l2 to be adjusted is adjusted.

[0043] The goal of the second cycle correction is to correct the stroke to be adjusted to l2'=l2-2(l1-l2), while keeping the standard stroke l1'=l1 unchanged, and to compensate for the difference in the first cycle through double compensation.

[0044] After the second cycle correction is completed, the third push cycle begins. A gradual correction strategy is adopted to correct the stroke to be adjusted to l2''=l2-(l1-l2), while the standard stroke remains l1''=l1, achieving precise convergence of the deviation. In subsequent cycles, this correction data is maintained and cyclically repeated until the stroke deviation exceeds the tolerance, at which point the parameters are corrected again.

[0045] During the correction of stroke parameters, the control motor 51 starts and controls its output shaft to rotate, which drives the reduction belt pulley 42 to rotate through the synchronous belt 48. The lead screw 43 rotates together with the reduction belt pulley 42. The floating groove 12 of the control block 53 restricts it to only move horizontally, so the control block 53 is forced to move. The adjusting block 46 moves synchronously with the control block 53. The inclined groove 47 restricts the sliding column 22, so that the sliding column 22 is forced to move up and down. The sliding plate 23 and the sliding seat 16 move synchronously with the sliding column 22, thereby adjusting the height of the hinge point of the crawling cylinder 25 and the sliding shoe 21, thus changing the actual stroke of the sliding shoe 21. During the entire sliding construction process, the number of times the second cycle of parameter doubling is required is far less than the number of other cycles of parameter doubling. Therefore, when parameter doubling is required, the adjusting motor 44 starts synchronously, controlling the lead screw 45 to rotate. Under the action of the thread, the adjusting block 46 is forced to move up and down, causing the sliding seat 16, sliding plate 23, and sliding column 22 to move again on the basis of the above-mentioned up and down movement, so as to achieve parameter doubling and compensate for the difference generated in the first cycle.

[0046] During the second cycle, the electromagnetic switch 55 needs to be activated in advance. After the electromagnet inside the electromagnetic switch 55 is energized, it controls the retraction of the square pin 56 at its execution end. The spring inside is further compressed, and the square pin 56 and the positioning groove 54 no longer cooperate, allowing the adjusting block 46 and the control block 53 to slide relative to each other. In other cycles, the electromagnet inside the electromagnetic switch 55 is de-energized, and the spring inside resets, causing the square pin 56 to extend and engage with the two positioning grooves 54, so that the control block 53 and the adjusting block 46 remain relatively stationary in most cases. In particular, in non-second cycles, when the control block 53 and the adjusting block 46 move synchronously, the spring inside the electromagnetic switch 55 adaptively expands and contracts within a certain range, so that the square pin 56 can always be inserted into the positioning groove 54.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sliding structure for installing steel box girders, characterized in that: It includes a track mounted on a sliding beam, a clamping seat and a sliding shoe slidably mounted on the track, a crawling cylinder hinged to the clamping seat and the sliding shoe, a clamping mechanism located inside the clamping seat and used to control the locking state of the clamping seat and the track, and a control mechanism located inside the sliding shoe and used to control the sliding distance of the sliding shoe. The clamping mechanism includes a wedge block disposed inside the clamping seat. When the piston rod of the crawling cylinder extends, the wedge block squeezes the track to lock the two together. When the piston rod of the crawling cylinder retracts, the two are unlocked. The control mechanism includes a lead screw 1 rotatably mounted on the inner wall of the slipper, a control block threadedly engaged with the lead screw 1, and a sliding seat detachably mounted on the control block and slidably connected to the side wall of the slipper. The sliding seat is hinged to one end of the crawling cylinder. By controlling the movement of the control block, the height of the sliding seat relative to the slipper is changed, thereby controlling the single sliding distance of the slipper. The track includes an integrally formed base plate, top plate, and web plate. Multiple pressure plates are provided at equal intervals on both sides of the base plate along the length of the track. The pressure plates are fixedly connected to the base plate and the sliding beam, respectively. The clamping seat forms a first groove on the side near the track, which cooperates with the top plate. The sliding shoe forms a second groove on the side near the track, which cooperates with the track. Two bottom pry bars are fixedly provided at one end of the slipper near the track, respectively located on both sides of the track. A side pry bar is fixedly provided on the side of the two bottom pry bars that are far apart from each other. The second sliding groove is located between the two bottom pry bars. A pad is fixedly provided on the side of the slipper away from the track. The clamping seat is provided with a through hole three at one end away from the track, which penetrates the inner wall of the clamping seat. The clamping mechanism also includes a square pin one fixedly disposed in the through hole three and a cylindrical pin one fixedly disposed at one end of the square pin one near the track. The wedge block is provided with a through groove in the middle and a through hole four penetrating the through groove on the side of the wedge block. The square pin one corresponds to the through groove and the cylindrical pin one is rotatably engaged with the through hole four. Each side of the first slide groove is provided with a floating groove that penetrates the inner wall of the clamping seat. A floating block is slidably provided in each floating groove. A floating seat located outside the clamping seat is fixed on one side of each floating block. The floating seat near the sliding shoe is hinged to one end of the crawling cylinder. The floating block is slidably mounted on the cylindrical pin 2. Both ends of the cylindrical pin 2 are fixedly connected to the inner wall of the clamping seat. A floating spring is provided on each side of the floating block. One end of the floating spring abuts against the floating block, and the other end of the floating spring abuts against the inner wall of the clamping seat. A mounting groove is provided on each side of the multiple floating blocks that are close to each other. A synchronization frame is provided inside the clamping seat. Multiple ends of the synchronization frame are detachably mounted in the multiple mounting grooves. A clamping groove is fixedly provided at the middle position of the synchronization frame near the track. A transmission rod is provided on each side of the clamping groove. A through hole 5 is provided at the end of the transmission rod. Multiple wedge blocks are provided. A cylindrical pin 3 is fixedly provided on each side of each wedge block. The through hole 5 is rotatably engaged with the cylindrical pin 3.

2. The sliding structure for installing a steel box girder according to claim 1, characterized in that: The control mechanism further includes a control motor, a mounting plate fixedly connected to the control motor, a cylindrical pin fixedly connected to the mounting plate and the inner wall of the slipper respectively, a drive pulley fixedly mounted on the output shaft of the control motor, and a reduction pulley driven by a synchronous belt, the reduction pulley being fixedly mounted at one end of the lead screw.

3. The sliding structure for installing a steel box girder according to claim 1, characterized in that: An adjusting block is slidably provided on the side of the control block near the clamping seat. Wave grooves are provided on the sides of the adjusting block and the control block that are close to each other. An adjusting motor is fixedly connected to the inner wall of the slipper on one side of the adjusting block. A second lead screw is fixedly provided on the output shaft of the adjusting motor. The second lead screw is threadedly engaged with the adjusting block. The axes of the second lead screw and the first lead screw are perpendicular to each other. An inclined groove is fixedly provided on the side of the adjusting block away from the control block. A positioning groove is provided on one side of the adjusting block and the control block respectively. An electromagnetic switch is fixedly provided on one inner wall of the slipper. A square pin is fixedly provided at one end of the electromagnetic switch. The square pin engages with the two positioning grooves.

4. The sliding structure for installing a steel box girder according to claim 3, characterized in that: The inner wall of the slip shoe near the clamping seat is provided with a sliding groove three. The sliding seat is fixedly provided with a sliding plate on the side away from the clamping seat. The sliding seat passes through the sliding groove three and is slidably connected to the sliding groove three. The sliding plate is located inside the slip shoe. Multiple sliding columns are fixedly provided at the end of the sliding plate away from the sliding seat. The multiple sliding columns are slidably connected to the inclined groove respectively.

5. A construction method for a sliding structure for installing a steel box girder, using a sliding structure for installing a steel box girder as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Construction preparation: Erect the sliding support system and sliding beam, clear the sliding channel, complete the measurement and layout positioning, lay two tracks as described, and install two sets of the sliding structure as described under the target steel box girder, with two in each set; S2. The jacking and sliding mechanism is controlled synchronously by a computer. It has a master command point and a slave command point. Synchronous jacking is achieved in a displacement following mode. The clamping seat clamps the rail to form a self-locking mechanism. The crawling cylinder extends to push the steel box girder forward by one stroke. When the cylinder retracts, the clamping seat releases the rail and resets. The jacking stroke is executed cyclically. Sliding is started by a graded loading method. The ideal stroke is set to L. S3. Measurement error: Mark the current cycle as the first cycle. During the first cycle, compare the difference between the actual stroke and the ideal stroke L of the two sets of sliding structures. Select the smaller difference as the standard stroke l1 and the larger difference as the stroke to be adjusted l2. The single stroke difference x = + (l1 - l2) is obtained. If x is greater than the set parameter, proceed to step S4; otherwise, proceed to step S5. S4. Correcting parameters: In the second cycle, for a set of sliding structures corresponding to the stroke l2 to be adjusted, the height of the sliding seat is adjusted by the control mechanism to control the stroke of the sliding shoe, so that l2'=l2-2(l1-l2), l1'=l1; In the third and subsequent cycles, l2''=l2-(l1-l2), l1''=l1; S5. Repeat the push-up process. In subsequent cycles, repeat steps S2 and S3. S6. Replacement support installation: After the steel box girder slides into place, the elevation and plane position of the steel box girder are finely adjusted by three-way jacks and matched with the previous section of steel box girder. Replacement support short rods are then installed on the sliding beam below the steel box girder. After the replacement support is completed, other operations are carried out on the steel box girder.

Images