A construction and installation system and method for steel truss bridges

Abstract

This invention relates to the field of steel truss bridge installation technology, and proposes a steel truss bridge construction and installation system for installing steel trusses onto bridge piers. The system includes hoisting equipment, temporary supports, a movable lifting support, a movable adjustment frame, and a limiting bracket. Two rows of bridge piers are constructed across a river, with multiple temporary supports spaced apart between two piers in the same row. A movable lifting support is positioned between the two rows of temporary supports, and its lifting is achieved through a scissor mechanism. Several movable adjustment frames are movably mounted on both sides of the upper end of the movable lifting support. A limiting bracket is located on the upper end of the temporary supports, away from the movable lifting support, and moves up and down through a limiting plate to abut against the steel truss. This invention achieves rapid positioning through the movable lifting support, movable adjustment frame, temporary supports, and limiting bracket, simplifying the positioning operation and improving construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel truss bridge installation and construction technology, and specifically discloses a steel truss bridge construction and installation system and construction method. Background Technology

[0002] Some steel truss bridges are constructed using a steel structure assembly and hoisting method. The steel truss is mainly composed of the main truss and the main truss connection system. The main truss includes the upper and lower chords and web members, while the main truss connection system includes crossbeams and cross braces. The steel truss segment hoisting process sequence is as follows: hoisting → alignment → temporary fixing → adjustment → positioning welding → adjustment → formal welding closure → flaw detection.

[0003] The segmented hoisting of the steel truss involves using hoisting equipment to lift the segmented steel truss sections into place and then connecting them. The installation platform for the steel truss uses a crane with a hanging basket, where construction workers stand to assist in adjusting the steel truss. In actual construction, this method makes it difficult to position the steel truss, and the positioning process is cumbersome and complex. It requires precise adjustment of the hoisting equipment's position before the next segment can be hoisted and installed. The positioning and adjustment process for the hoisting equipment requires a significant amount of time and manpower, which prolongs the construction period, reduces overall construction efficiency, and poses significant safety risks and inconveniences for high-altitude operations. Summary of the Invention

[0004] The purpose of this invention is to provide a steel truss bridge construction and installation system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] Firstly, this application provides a steel truss bridge construction and installation system, which adopts the following technical solution:

[0007] A steel truss bridge construction and installation system is disclosed for installing steel trusses onto bridge piers. The system includes hoisting equipment, temporary supports, a movable lifting support, a movable adjustment frame, and a limiting bracket. Two rows of piers are constructed across a river. Multiple temporary supports are spaced between two piers in the same row. A movable lifting support is positioned between the two rows of temporary supports. The movable lifting support is raised and lowered via a scissor mechanism. Several movable adjustment frames are movably mounted on both sides of the upper end of the movable lifting support. Each movable adjustment frame includes a longitudinal movement cylinder, a vertical cylinder, a rotary motor, and a support bracket. The system includes a cross brace, a telescopic plate base, a telescopic plate, and a fixed hydraulic cylinder. The telescopic end of the longitudinal hydraulic cylinder is equipped with a rotating motor, and the fixed end of the vertical hydraulic cylinder is fixedly connected to the output shaft of the rotating motor. The telescopic plate is movably connected to the telescopic plate base. A fixed hydraulic cylinder is installed on one side of the vertical hydraulic cylinder. The piston rod of the vertical hydraulic cylinder is connected to the cross brace, and the piston rod of the fixed hydraulic cylinder is connected to a roller frame. Several supporting hydraulic cylinders are installed at the upper end of the temporary support. A limit bracket is installed on the side of the upper end of the temporary support away from the movable lifting support. The limit bracket moves up and down through the limit plate frame to abut against the steel truss.

[0008] Furthermore, the movable lifting support includes a scissor lift, a lateral rack, and lateral guide rails. The scissor lift includes a support platform, with lateral racks fixed on both sides along the length of the steel truss. Several lateral guide rails are provided on the support platform along its length, and a movable pulley is provided at the lower end of the scissor lift.

[0009] Furthermore, the movable adjustment frame also includes rollers, a telescopic rack, a telescopic motor, and a telescopic gear. Roller tracks are provided on both sides of the telescopic plate base. Several rollers are installed on both sides inside the telescopic plate. The rollers roll within the roller tracks of the telescopic plate base. A telescopic rack is installed at the lower part of the roller track on at least one side of the telescopic plate base. A telescopic motor is installed inside the telescopic plate. The output shaft of the telescopic motor is fixedly connected to the telescopic gear. The telescopic gear meshes with the telescopic rack for transmission. A side-moving pulley is installed at the bottom of the telescopic plate base. The side-moving pulley is rolled on the side-moving guide rail.

[0010] Furthermore, the movable adjustment frame also includes a lateral motor support, a lateral motor, and a lateral gear. The telescopic plate base has a mounting groove at one end near the lateral rack. The lateral motor support is fixed in the mounting groove, and the lateral motor is fixed in the lateral motor support. The output shaft of the lateral motor is fixedly connected to the lateral gear, and the lateral gear is meshed with the lateral rack for transmission.

[0011] Furthermore, the movable adjustment frame also includes a side shift chamber, a support seat, and a top push guide rail. A top push guide rail is provided at one end of the bottom surface inside the side shift chamber, and the top push guide rail extends to the other end of the side shift chamber. A support seat is slidably arranged on the top push guide rail. The support seat is fixedly connected to the telescopic end of the longitudinal shift cylinder. A fixed cylinder is provided at the other end of the bottom surface inside the side shift chamber. The cylinder body of the longitudinal shift cylinder is fixed to the side of the side shift chamber, and the piston rod of the longitudinal shift cylinder is inserted into the side shift chamber. The support seat includes a vertical support plate and a bottom support plate arranged perpendicularly to each other. The piston rod of the longitudinal shift cylinder is fixed on the vertical support plate of the support seat, and the rotating motor is installed on the bottom support plate of the support seat.

[0012] Furthermore, the limiting bracket includes a guide rod, a connecting plate, a limiting plate frame, and a limiting cylinder. The guide rod is vertically arranged, the connecting plate is slidably connected to the guide rod, and a limiting cylinder is provided in the middle of one side of the connecting plate. The piston end of the limiting cylinder is connected to the limiting plate frame, and both ends of the limiting plate frame are connected to both ends of the connecting plate through telescopic cylinders.

[0013] Furthermore, the limiting bracket is provided with two connecting horizontal plates at the top and bottom, and the two connecting horizontal plates are connected by a guide rod. The two connecting horizontal plates are connected by a motor screw structure to drive the connecting plate to move up and down, or by a chain structure to drive the connecting plate to move up and down.

[0014] Secondly, this application provides a construction method for a steel truss bridge construction and installation system, which includes the following steps:

[0015] S1: Install the mobile lifting support, mobile adjustment frame, temporary support and limit bracket. Install the mobile adjustment frame on the mobile lifting support. Set multiple temporary supports at intervals between two piers in the same row. Install the limit bracket on the temporary supports. Push the mobile lifting support between the two rows of temporary supports.

[0016] S2: Adjust the height of the support platform to a suitable position, adjust the movable adjustment frame to a suitable position, adjust the support cylinder so that the support cylinder extends slightly higher than the embedded steel plate, adjust the height of the vertical cylinder and the fixed cylinder so that the support cross frame and the roller frame are flush with the piston rod end of the support cylinder, drive the limit lifting motor one, adjust the limit plate frame to the installation position of the lower chord section, and drive the limit cylinder to extend the limit plate frame to a suitable position;

[0017] S3: The steel truss is set with two sections. The lower chord segments at the ends of the two steel trusses are installed respectively. The hoisting equipment hoists the lower chord segments onto the support crossbeams of the vertical cylinders near the same row of temporary supports. The drive motor adjusts the placement angle of the lower chord segments. The side motor drives the side-moving gear to move along the side-moving rack and adjusts the position of the telescopic plate base. One end of the lower chord segment is aligned with the pier installation position. The telescopic plate is moved towards the temporary support. The drive cylinder pushes the lower chord segment onto the support cylinder until the side of the lower chord segment abuts against the limit plate frame. The support cylinder retracts to be flush with the embedded steel plate, so that one end of the lower chord segment is located at the pier installation position, and the pier and the lower chord segment are fixedly connected.

[0018] S4: Move the telescopic plate away from the temporary support, and drive the side motor to move the moving adjustment frames on both sides to the ends of the lower chord segment near the pier.

[0019] S5: Install the middle and end crossbeams located between the two steel trusses. The hoisting equipment hoists the end crossbeams onto the movable adjustment frames on both sides. Drive the vertical cylinder and the rotary motor to adjust the placement height and angle of the end crossbeams. Adjust the position of the telescopic plate base. Connect the end crossbeams to the lower chord sections on both sides. Adjust the position of the movable adjustment frames. Similarly, install the middle crossbeams.

[0020] S6: Raise the scissor lift closer to the installation position of the web member, drive the side motor to move the two movable adjustment frames on both sides to the installation position of the web member respectively, move the telescopic plate closer to the lower chord section, and drive the corresponding limit lifting motor to raise the limit plate frame to the appropriate position.

[0021] S7: Pre-connect the web members at the end of the steel truss with the upper chord segment at the end as a combined segment, install the combined segment, hoist the combined segment onto the movable adjustment frame, drive the rotary motor to adjust the placement angle of the combined segment, adjust the telescopic plate base and telescopic plate, operate the longitudinal movement cylinder to align the combined segment with the lower chord segment, limit the combined segment with the lower chord segment, and fix the combined segment to the lower chord segment.

[0022] S8: Move the telescopic plate away from the lower chord section, raise the scissor lift towards the installation position of the cross brace, and drive the side motor to move the moving adjustment frames on both sides to the ends of the upper chord section respectively;

[0023] S9: Install the cross bracing between the combined rod segments. Use hoisting equipment to hoist the cross bracing between the combined rod segments onto the movable adjustment frame. Drive the vertical cylinder and the rotary motor to adjust the placement height and angle of the cross bracing between the combined rod segments. Adjust the telescopic plate base to fix the cross bracing between the combined rod segments to the combined rod segments.

[0024] S10: Push the movable lifting support and adjust the movable adjustment frame and limit bracket, and continue to install other lower chord segments, web members, upper chord segments, middle crossbeams and cross braces.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This invention provides a steel truss bridge construction and installation system. The hoisting equipment lifts segmented steel truss structures onto a movable adjustment frame. The segmented steel truss is quickly adjusted and positioned using movable lifting supports, the movable adjustment frame, temporary supports, and limiting brackets. This simplifies the positioning operation and eliminates the need for multiple precise adjustments to the hoisting position during the hoisting process. Furthermore, while the movable lifting supports, movable adjustment frames, temporary supports, and limiting brackets are in operation, the hoisting equipment can prepare for the hoisting of the next segment of the steel truss structure. This shortens the positioning time, accelerates the construction process, reduces the number of high-altitude work procedures for construction personnel, reduces labor intensity, and improves construction efficiency.

[0027] 2. The present invention provides a steel truss bridge construction and installation system. By pushing a movable lifting support, segmented steel trusses can be installed more conveniently. The movable adjustment frame can move the segmented steel trusses along the length direction of the steel truss through a lateral rack and lateral gear. The segmented steel trusses are pushed and conveyed along the width direction of the steel truss through a longitudinal cylinder, a vertical cylinder, a fixed cylinder, and a telescopic plate. The limiting plate limits the width direction of the steel truss. The steel truss is supported by a vertical cylinder, a fixed cylinder, and a support cylinder. The cooperation of each structure enables more accurate, convenient, and rapid positioning and installation of the steel truss. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of a steel truss bridge construction and installation system according to Embodiment 1 of the present invention;

[0029] Figure 2 This is a structural schematic diagram of a steel truss bridge construction and installation system, including a movable lifting support, a movable adjustment frame, and a temporary support pier, according to Embodiment 1 of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of a movable adjustment frame for a steel truss bridge construction and installation system according to Embodiment 1 of the present invention;

[0031] Figure 4 This is a structural schematic diagram of the connection state between the movable lifting support and the movable adjustment frame in Embodiment 1 of the present invention;

[0032] Figure 5 For the present invention Figure 4 Enlarged view at point M;

[0033] Figure 6 For the present invention Figure 3Enlarged view of N points;

[0034] Figure 7 This is a structural schematic diagram of the connection state between the telescopic plate base and the telescopic plate in a steel truss bridge construction and installation system according to Embodiment 1 of the present invention;

[0035] Figure 8 This is a structural schematic diagram of the telescopic plate base and the telescopic plate in an exploded state of a steel truss bridge construction and installation system according to Embodiment 1 of the present invention;

[0036] Figure 9 For the present invention Figure 8 Enlarged view of point Q;

[0037] Figure 10 This is a structural schematic diagram of a limiting bracket for a steel truss bridge construction and installation system according to Embodiment 1 of the present invention;

[0038] Figure 11 This is an exploded view of the lifting nut and limit cylinder of a steel truss bridge construction and installation system according to Embodiment 1 of the present invention.

[0039] Figure 12 This is a structural schematic diagram of a limiting bracket for a steel truss bridge construction and installation system according to Embodiment 2 of the present invention;

[0040] Figure 13 For the present invention Figure 12 Enlarged view of point R.

[0041] In the diagram: 1. Mobile lifting support; 2. Mobile adjustment frame; 3. Temporary support; 4. Limiting bracket; 5. Steel truss; 6. Pier; 11. Scissor lift; 12. Lateral rack; 13. Lateral guide rail; 21. Longitudinal cylinder; 22. Vertical cylinder; 23. Rotary motor; 24. Support crossbeam; 25. Lateral compartment; 26. Support seat; 27. Pushing guide rail; 28. Lateral motor support; 29. ​​Lateral motor; 31. Support cylinder; 41. Screw; 42. Guide rod; 43. Lifting nut; 44. Sliding sleeve; 45. Support plate; 46. Limiting plate frame; 47. Limiting cylinder; 48. Limiting lifting motor one; 49. Connection. 51. Horizontal plate; 52. Lower chord segment; 53. Web member; 54. Upper chord segment; 55. Middle crossbeam; 56. End crossbeam; 61. Horizontal brace; 210. Embedded steel plate; 211. Lateral shift gear; 212. Telescopic plate base; 213. Roller; 214. Telescopic rack; 215. Telescopic motor; 216. Telescopic gear; 217. Fixed cylinder; 218. Roller frame; 111. Support platform; 410. Telescopic cylinder; 411. Fixed plate; 412. Limit lifting motor II; 413. Drive sprocket; 414. Driven sprocket; 415. Chain; 416. Fixing component; 431. Front support plate; 461. Rear support. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the following description of the invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" simply indicates a connection between devices and has no special meaning.

[0044] Furthermore, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Specific Implementation Example 1: Please refer to Figures 1-11 A steel truss bridge construction and installation system is disclosed for installing steel trusses 5 onto bridge piers 6. The system includes hoisting equipment, temporary supports 3, a movable lifting support 1, a movable adjustment frame 2, and a limiting bracket 4. Two rows of bridge piers 6 are installed across a river. Multiple temporary supports 3 are spaced apart between two piers 6 in the same row. A movable lifting support 1 is installed between the two rows of temporary supports 3. The movable lifting support 1 is raised and lowered via a scissor mechanism. Several movable adjustment frames 2 are movably installed on both sides of the upper end of the movable lifting support 1. Each movable adjustment frame 2 includes a longitudinal movement cylinder 21, a vertical cylinder 22, a rotary motor 23, a support crossbeam 24, a telescopic plate base 211, a telescopic plate 212, and a fixed cylinder 217. A rotating motor 23 is installed at the telescopic end of 21. The fixed end of the vertical cylinder 22 is fixedly connected to the output shaft of the rotating motor 23. The telescopic plate 212 is movably connected to the telescopic plate base 211. A fixed cylinder 217 is installed on one side of the vertical cylinder 22. The piston rod of the vertical cylinder 22 is connected to a support crossbeam 24. The piston rod of the fixed cylinder 217 is connected to a roller frame 218. Multiple rollers are rotatably arranged on the roller frame 218. The multiple rollers are evenly distributed at intervals along a direction parallel to the support crossbeam 24. Several support cylinders 31 are installed at the upper end of the temporary support 3. A limit bracket 4 is installed on the side of the upper end of the temporary support 3 away from the movable lifting support 1. The limit bracket 4 moves up and down through the limit plate frame 46 and abuts against the steel truss 5.

[0046] The steel truss 5 includes a lower chord segment 51, which is placed on the support crossbeam 24 and roller frame 218 by hoisting equipment. The lower chord segment 51 located at the end of the steel truss 5 is transferred to the temporary support 3 and the bridge pier 6 by the movable adjustment frame 2. The bridge pier 6 is provided with a pre-embedded steel plate 61. One end of the lower chord segment 51 located at the end of the steel truss 5 is fixedly connected to the pre-embedded steel plate 61, and the other end is placed on the temporary support 3.

[0047] The movable lifting support 1 includes a scissor lift 11, a side-shifting rack 12, and a side-shifting guide rail 13. The scissor lift 11 includes a support platform 111. Side-shifting racks 12 are fixed on both sides of the support platform 111 along the length of the steel truss 5. Several side-shifting guide rails 13 are provided on the upper surface of the support platform 111 along its length. The lower end of the scissor lift 11 is provided with a movable pulley.

[0048] The movable adjustment frame 2 also includes a side shift chamber 25, a support seat 26, a push guide rail 27, a side shift motor support 28, a side drive motor 29, and a side shift gear 210. The push guide rail 27 is provided at one end of the bottom surface inside the side shift chamber 25 and extends to the other end of the side shift chamber 25. The support seat 26 is slidably arranged on the push guide rail 27. The fixed oil cylinder 217 is provided at the other end of the bottom surface inside the side shift chamber 25. The cylinder body of the longitudinal shift oil cylinder 21 is fixed to the side of the side shift chamber 25, and the piston rod of the longitudinal shift oil cylinder 21 is inserted into the side shift chamber 25. The support seat 26 is L-shaped and includes a vertical support plate and a bottom support plate arranged perpendicularly to each other. The piston rod of the longitudinal shift oil cylinder 21 passes through the side shift chamber 25 and is fixed on the vertical support plate of the support seat 26. The rotating motor 23 is installed on the bottom support plate of the support seat 26.

[0049] The movable adjustment frame 2 also includes a side-moving motor support 28, a side-moving motor 29, a side-moving gear 210, rollers 213, a telescopic rack 214, a telescopic motor 215, and a telescopic gear 216. Roller tracks are provided on both sides of the telescopic plate base 211. Several rollers 213 are installed on both sides inside the telescopic plate 212, and the rollers 213 roll within the roller tracks of the telescopic plate base 211. A telescopic rack 214 is installed at the lower part of the roller track on at least one side of the telescopic plate base 211. A telescopic motor 215 is installed inside the telescopic plate 212. The output shaft of 15 is fixedly connected to the telescopic gear 216. The telescopic gear 216 is meshed with the telescopic rack 214 for transmission. A side-moving pulley is installed at the bottom of the telescopic plate base 211. The side-moving pulley is rolled on the side-moving guide rail 13. A mounting groove is provided at one end of the telescopic plate base 211 near the side-moving rack 12. A side-moving motor support 28 is fixed in the mounting groove. A side-moving motor 29 is fixed in the side-moving motor support 28. The output shaft of the side-moving motor 29 is fixedly connected to the side-moving gear 210. The side-moving gear 210 is meshed with the side-moving rack 12 for transmission.

[0050] The telescopic plate 212 can move on the telescopic plate base 211. The lateral shift gear 210 drives the moving adjustment frame 2 to move along the lateral shift rack 12. The lateral shift pulley moves along the lateral shift guide rail 13. The longitudinal shift cylinder 21 pushes the support guide seat 26 to move along the top push guide rail 27. The rotating motor 23 can rotate the vertical cylinder 22, which drives the support crossbeam 24 to rotate. When the various components of the steel truss 5 are placed on the support crossbeam 24 and the roller frame 218, the rotating motor 23 can adjust their placement angle. The roller frame 218 can reduce the friction with the various components of the steel truss 5. The vertical cylinder 22 can adjust its placement angle. Initially, the support crossbeam 24 and the roller frame 218 are at the same height. The longitudinal movement cylinder 21 pushes the guide seat 26 towards the fixed cylinder 217. Then, the vertical cylinder 22 lowers the support crossbeam 24, and the piston rod of the longitudinal movement cylinder 21 retracts. The support crossbeam 24 rises again to support the components of the steel truss 5. The piston rod of the longitudinal movement cylinder 21 extends and pushes the components of the steel truss 5 to move along the width of the steel truss 5. This action is repeated to complete the jacking motion and transfer the components of the steel truss 5 to the temporary support 3. The rollers on the roller frame 218 facilitate the transfer of the components of the steel truss 5.

[0051] The limiting bracket 4 includes a screw 41, guide rods 42, lifting nuts 43, sliding sleeves 44, a connecting plate 45, a limiting plate frame 46, a limiting cylinder 47, a limiting lifting motor 48, and a connecting horizontal plate 49. Two connecting horizontal plates 49 are arranged vertically. The lower connecting horizontal plate 49 is fixed to a temporary support 3. The screw 41 and two guide rods 42 are arranged between the two connecting horizontal plates 49. The limiting lifting motor 48 is fixed on the upper connecting horizontal plate 49. The output shaft of the limiting lifting motor 48 is fixedly connected to the screw 41. The two guide rods 42 are located on both sides of the screw 41. A lifting nut 4 is threaded onto the screw 41. 3. A sliding sleeve 44 is fitted on the guide rod 42. The support plate 45 is connected to the lifting nut 43 and the sliding sleeve 44 and extends to both ends. A front support plate 431 is fixed in the middle of one side of the support plate 45. The cylinder body of the limiting cylinder 47 is fixedly connected to the front support plate 431. The piston rod of the limiting cylinder 47 is fixedly connected to the limiting plate frame 46. The limiting plate frame 46 is used to limit the side of the steel truss 5 when the moving adjustment frame 2 pushes the various parts of the steel truss 5 onto the temporary support 3. Rear supports 461 are fixed at both ends of the limiting plate frame 46. A telescopic cylinder 410 is provided on the support plate 45. The telescopic cylinder 410 is connected to the rear support 461.

[0052] The steel truss 5 also includes web members 52, upper chord segments 53, middle crossbeams 54, end crossbeams 55, and cross braces 56. The lower part of the web members 52 is set on the lower chord segments 51, and the upper end of the web members 52 is connected to the upper chord segments 53. The lower chord segments 51 on both sides of the ends of the steel truss 5 are connected by the middle crossbeams 54 and the end crossbeams 55. The lower chord segments 51 on both sides of the middle part of the steel truss 5 are connected by the middle crossbeams 54. The web members 52 and upper chord segments 53 on both sides of the steel truss 5 are connected by cross braces 56. Several middle crossbeams 54 are evenly arranged, and two end crossbeams 55 are provided. The two end crossbeams 55 are respectively set at the two ends of the steel truss 5. The lower chord segments 51, web members 52, upper chord segments 53, middle crossbeams 54, end crossbeams 55, and cross braces 56 are connected by welding or bolting.

[0053] This application provides a construction method for a steel truss bridge construction and installation system, applicable to the aforementioned steel truss bridge construction and installation system, comprising the following steps:

[0054] S1: Install the mobile lifting support 1, the mobile adjustment frame 2, the temporary support 3 and the limiting bracket 4. Install the mobile adjustment frame 2 onto the mobile lifting support 1. Set multiple temporary supports 3 at intervals between two bridge piers 6 in the same row. Install the limiting bracket 4 on the temporary supports 3. Push the mobile lifting support 1 between the two rows of temporary supports 3.

[0055] S2: Adjust the height of the support platform 111 to a suitable position, adjust the movable adjustment frame 2 to a suitable position, adjust the support cylinder 31 so that the support cylinder 31 extends slightly higher than the embedded steel plate 61, adjust the height of the vertical cylinder 22 and the fixed cylinder 217 so that the support cross frame 24 and the roller frame 218 are flush with the piston rod end of the support cylinder 31, drive the limit lifting motor 48 to adjust the limit plate frame 46 to the installation position of the lower chord section 51, and drive the limit cylinder 47 to extend the limit plate frame 46 to a suitable position;

[0056] S3: Two steel trusses 5 are provided, and the lower chord segments 51 at the ends of the two steel trusses 5 are installed respectively. The hoisting equipment hoists the lower chord segments 51 onto the support crossbeams 24 of the vertical hydraulic cylinders 22 near the same row of temporary supports 3. The drive motor 23 adjusts the placement angle of the lower chord segments 51 so that the angle of the lower chord segments 51 is consistent with the angle after installation. The side-moving motor 29 drives the side-moving gear 210 to move along the side-moving rack 12, adjusting the position of the telescopic plate base 211. One end of the lower chord segment 51 at the end of the steel truss 5 is aligned with the installation position of the pier 6. The telescopic plate 212 is moved towards the temporary support 3, and the longitudinal cylinder 21 is driven to push the lower chord segment 51 to the support cylinder 31 until the side of the lower chord segment 51 abuts against the limit plate frame 46. The support cylinder 31 is then retracted to be flush with the embedded steel plate 61, so that one end of the lower chord segment 51 at the end of the steel truss 5 is located at the installation position of the pier 6, and the pier 6 and the lower chord segment 51 are fixedly connected.

[0057] S4: Move the telescopic plate 212 away from the temporary support 3, and drive the side motor 29 to move the two sides of the moving adjustment frame 2 to the end of the lower chord segment 51 near the pier 6 respectively;

[0058] S5: Install the middle crossbeam 54 and end crossbeam 55 located between the two steel trusses 5. The hoisting equipment hoists the end crossbeam 55 onto the movable adjustment frame 2 on both sides. Drive the vertical cylinder 22 and the rotary motor 23 to adjust the placement height and placement angle of the end crossbeam 55. Adjust the position of the telescopic plate base 211. Connect the end crossbeam 55 to the lower chord section 51 on both sides. Adjust the position of the movable adjustment frame 2. Similarly, install the middle crossbeam 54.

[0059] S6: Raise the scissor lift 11 toward the installation position of the web member 52, drive the side motor 29 to move the two movable adjustment frames 2 to the installation positions of the web member 52 respectively, move the telescopic plate 212 toward the direction of the lower chord section 51, and drive the corresponding limit lifting motor 48 to raise the limit plate frame 46 to the appropriate position.

[0060] S7: Pre-connect the web member 52 at the end of the steel truss 5 with the upper chord member 53 at the end as a combined member segment, install the combined member segment, the hoisting equipment hoists the combined member segment onto the movable adjustment frame 2, drive the rotary motor 23 to adjust the placement angle of the combined member segment, adjust the telescopic plate base 211 and telescopic plate 212, operate the longitudinal movement cylinder 21 to align the combined member segment with the lower chord member 51, limit the combined member segment with the limit plate frame 46, and fix the combined member segment with the lower chord member 51.

[0061] S8: Move the telescopic plate 212 away from the lower chord section 51, raise the scissor lift 11 to approach the installation position of the cross brace 56, and drive the side motor 29 to move the two side adjustment frames 2 to the ends of the upper chord section 53 respectively.

[0062] S9: Install the cross brace 56 between the combined rod segments, use hoisting equipment to hoist the cross brace 56 between the combined rod segments onto the movable adjustment frame 2, drive the vertical cylinder 22 and the rotating motor 23 to adjust the placement height and placement angle of the cross brace 56 between the combined rod segments, adjust the telescopic plate base 211, and fix the cross brace 56 between the combined rod segments to the combined rod segments.

[0063] S10: Push the movable lifting support 1 and adjust the movable adjustment frame 2 and the limit bracket 4, and continue to install other lower chord segments 51, web members 52, upper chord segments 53, middle crossbeams 54 and cross braces 56.

[0064] When installing other lower chord segments 51, the position of the telescopic plate base 211 needs to be moved and adjusted so that the end of the lower chord segment 51 is aligned with the end of the previous adjacent lower chord segment 51. When installing other upper chord segments 53 and corresponding web member 52 combination segments, the position of the telescopic plate base 211 needs to be moved and adjusted so that the end of the upper chord segment 53 is aligned with the end of the previous adjacent upper chord segment 53.

[0065] The steel truss 5 achieves rapid positioning through the movable lifting support 1, movable adjustment frame 2, temporary support 3, and limiting bracket 4. The positioning method is simple, shortens the positioning time, and improves construction efficiency.

[0066] Specific Implementation Example 2: Please refer to Figure 12 and Figure 13 In Embodiment 1, the limiting bracket 4 uses a screw 41 and a lifting nut 43 for transmission. This transmission method has poor working speed, high wear, and short life. Therefore, the screw and nut structure is changed to a sprocket and chain structure. In this embodiment, the limiting bracket 4 includes a guide rod 42, a sliding sleeve 44, a support plate 45, a limiting plate frame 46, a limiting cylinder 47, and a connecting horizontal plate 49. It also includes a fixing plate 411, a limiting lifting motor 412, a driving sprocket 413, a driven sprocket 414, a chain 415, and a fixing member 416. Fixing plates 411 are installed on both sides of the connecting horizontal plate 49. One of the fixing plates 411 of the connecting horizontal plate 49 is equipped with a... Limiting lifting motor 2 412, the output shaft of limit lifting motor 2 412 is fixedly connected to driving sprocket 413, another driving sprocket 414 is rotatably connected between the fixed plates 411 on both sides of the connecting horizontal plate 49, the driving sprocket 413 and the driving sprocket 414 are connected by the meshing transmission of chain 415, the two sliding sleeves 44 are connected by support plate 45, and the chain 415 and support plate 45 are fixedly connected by fastener 416. This setting is reliable, accurate in transmission, efficient, has a large power transmission capacity, strong overload capacity, can work in harsh environments such as high temperature, humidity, dust, and pollution, and has a longer service life. Other settings are the same as in embodiment 1.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel truss bridge construction and installation system for installing steel trusses (5) onto bridge piers (6), comprising hoisting equipment and temporary supports (3), characterized in that: It also includes a movable lifting support (1), a movable adjustment frame (2), and a limiting bracket (4). Two rows of bridge piers (6) are set across the river. Multiple temporary supports (3) are set between the two bridge piers (6) in the same row. A movable lifting support (1) is set between the two rows of temporary supports (3). The movable lifting support (1) is lifted and lowered by a scissor mechanism. Several movable adjustment frames (2) are movably set on both sides of the upper end of the movable lifting support (1). The movable adjustment frame (2) includes a longitudinal movement cylinder (21), a vertical cylinder (22), a rotating motor (23), a support crossbeam (24), a telescopic plate base (211), a telescopic plate (212), and a fixed cylinder (217). The longitudinal movement cylinder (211) The telescopic end of the vertical cylinder (22) is equipped with a rotating motor (23), the fixed end of the vertical cylinder (22) is fixedly connected to the output shaft of the rotating motor (23), the telescopic plate (212) is movably connected to the telescopic plate base (211), a fixed cylinder (217) is installed on one side of the vertical cylinder (22), the piston rod of the vertical cylinder (22) is connected to a support crossbeam (24), the piston rod of the fixed cylinder (217) is connected to a roller frame (218), a number of support cylinders (31) are set on the upper end of the temporary support (3), a limit bracket (4) is set on the side of the upper end of the temporary support (3) away from the movable lifting support (1), and the limit bracket (4) moves up and down through the limit plate frame (46) to abut against the steel truss (5); The movable lifting support (1) includes a scissor lift (11), a side-shifting rack (12), and a side-shifting guide rail (13). The scissor lift (11) includes a support platform (111). Side-shifting racks (12) are fixed on both sides of the support platform (111) along the length of the steel truss (5). Several side-shifting guide rails (13) are provided on the support platform (111) along its length. A movable pulley is provided at the lower end of the scissor lift (11). The movable adjustment frame (2) also includes rollers (213), telescopic racks (214), telescopic motors (215) and telescopic gears (216). Roller tracks are provided on both sides of the telescopic plate base (211). Several rollers (213) are installed on both sides inside the telescopic plate (212). The rollers (213) roll in the roller tracks of the telescopic plate base (211). A telescopic rack (214) is installed at the bottom of the roller track on at least one side of the telescopic plate base (211). A telescopic motor (215) is installed inside the telescopic plate (212). The output shaft of the telescopic motor (215) is fixedly connected to the telescopic gear (216). The telescopic gear (216) is meshed with the telescopic rack (214) for transmission. A side-moving pulley is installed at the bottom of the telescopic plate base (211). The side-moving pulley is rolled on the side-moving guide rail (13). The movable adjustment frame (2) also includes a side-moving motor support (28), a side-moving motor (29), and a side-moving gear (210). The telescopic plate base (211) has an installation groove at one end near the side-moving rack (12). The side-moving motor support (28) is fixed in the installation groove. The side-moving motor (29) is fixed in the side-moving motor support (28). The output shaft of the side-moving motor (29) is fixedly connected to the side-moving gear (210). The side-moving gear (210) is meshed with the side-moving rack (12) for transmission. The movable adjustment frame (2) also includes a side shift chamber (25), a support seat (26), and a top push guide rail (27). A top push guide rail (27) is provided at one end of the bottom surface inside the side shift chamber (25), extending towards the other end of the side shift chamber (25). A support seat (26) is slidably mounted on the top push guide rail (27), and the support seat (26) is fixedly connected to the telescopic end of the longitudinal movement cylinder (21). The side shift chamber (25) is located inside... A fixed cylinder (217) is provided at the other end of the bottom surface. The cylinder body of the longitudinal displacement cylinder (21) is fixed to the side of the side displacement chamber (25). The piston rod of the longitudinal displacement cylinder (21) is inserted into the side displacement chamber (25). The support seat (26) includes a vertical support plate and a bottom support plate arranged perpendicularly to each other. The piston rod of the longitudinal displacement cylinder (21) is fixed on the vertical support plate of the support seat (26). The rotating motor (23) is installed on the bottom support plate of the support seat (26).

2. The steel truss bridge construction and installation system according to claim 1, characterized in that: The limiting bracket (4) includes a guide rod (42), a connecting plate (45), a limiting plate frame (46), and a limiting cylinder (47). The guide rod (42) is vertically arranged, and the connecting plate (45) is slidably connected to the guide rod (42). A limiting cylinder (47) is provided in the middle of one side of the connecting plate (45). The piston end of the limiting cylinder (47) is connected to the limiting plate frame (46). The two ends of the limiting plate frame (46) are connected to the two ends of the connecting plate (45) respectively through telescopic cylinders (410).

3. The steel truss bridge construction and installation system according to claim 2, characterized in that: The limiting bracket (4) is provided with two connecting horizontal plates (49) on the top and bottom. The two connecting horizontal plates (49) are connected by a guide rod (42). The two connecting horizontal plates (49) are connected by a motor screw structure to drive the connecting plate (45) to move up and down, or the two connecting horizontal plates (49) are connected by a chain structure to drive the connecting plate (45) to move up and down.

4. A construction method for a steel truss bridge construction and installation system, applied to the steel truss bridge construction and installation system described in claim 3, characterized in that: Includes the following steps: S1: Install the mobile lifting support (1), the mobile adjustment frame (2), the temporary support (3) and the limiting bracket (4), install the mobile adjustment frame (2) on the mobile lifting support (1), set multiple temporary supports (3) at intervals between two bridge piers (6) in the same row, install the limiting bracket (4) on the temporary supports (3), and push the mobile lifting support (1) between the two rows of temporary supports (3); S2: Adjust the height of the support platform (111) to a suitable position, adjust the movable adjustment frame (2) to a suitable position, adjust the support cylinder (31) so that the support cylinder (31) extends slightly higher than the embedded steel plate (61), adjust the height of the vertical cylinder (22) and the fixed cylinder (217) so that the support cross frame (24) and the roller frame (218) are flush with the piston rod end of the support cylinder (31), drive the limit lifting motor (48) to adjust the limit plate frame (46) to the installation position of the lower chord section (51), drive the limit cylinder (47) to extend the limit plate frame (46) to a suitable position; S3: The steel truss (5) is provided with two sections, and the lower chord segments (51) at the ends of the two steel trusses (5) are installed respectively. The hoisting equipment hoists the lower chord segments (51) onto the support crossbeams (24) of the vertical cylinders (22) near the same row of temporary supports (3). The drive motor (23) adjusts the placement angle of the lower chord segments (51). The side-moving motor (29) drives the side-moving gear (210) to move along the side-moving rack (12) to adjust the position of the telescopic plate base (211) and place the lower chord segments (51) 51) Align one end with the installation position of the pier (6), move the telescopic plate (212) towards the temporary support (3), drive the longitudinal cylinder (21) to push the lower chord segment (51) to the support cylinder (31) until the side of the lower chord segment (51) abuts against the limit plate frame (46), and the support cylinder (31) retracts to be flush with the embedded steel plate (61), so that one end of the lower chord segment (51) is located at the installation position of the pier (6), and fix the pier (6) and the lower chord segment (51) in place; S4: Move the telescopic plate (212) away from the temporary support (3) and drive the side motor (29) to move the two sides of the moving adjustment frame (2) to the end of the lower chord segment (51) near the pier (6); S5: Install the middle crossbeam (54) and end crossbeam (55) located between the two steel trusses (5). The hoisting equipment hoists the end crossbeam (55) onto the movable adjustment frame (2) on both sides. Drive the vertical cylinder (22) and the rotary motor (23) to adjust the placement height and placement angle of the end crossbeam (55). Adjust the position of the telescopic plate base (211). Connect the end crossbeam (55) to the lower chord section (51) on both sides. Adjust the position of the movable adjustment frame (2). Similarly, install the middle crossbeam (54). S6: Raise the scissor lift (11) to approach the installation position of the web member (52), drive the side motor (29) to move the two movable adjustment frames (2) to the installation positions of the web member (52) respectively, move the telescopic plate (212) to approach the lower chord section (51), drive the corresponding limit lifting motor (48) to raise the limit plate frame (46) to the appropriate position; S7: Pre-connect the web members (52) at the end of the steel truss (5) with the upper chord segment (53) at the end as a combined segment, install the combined segment, hoist the combined segment onto the movable adjustment frame (2) using the hoisting equipment, drive the rotating motor (23) to adjust the placement angle of the combined segment, adjust the telescopic plate base (211) and telescopic plate (212), operate the longitudinal movement cylinder (21) to align the combined segment with the lower chord segment (51), limit the combined segment with the limiting plate frame (46), and fix the combined segment with the lower chord segment (51). S8: Move the telescopic plate (212) away from the lower chord section (51), raise the scissor lift (11) to the installation position of the cross brace (56), and drive the side motor (29) to move the two side adjustment frames (2) to the ends of the upper chord section (53) respectively. S9: Install the cross brace (56) between the combined rod segments, use hoisting equipment to hoist the cross brace (56) between the combined rod segments onto the movable adjustment frame (2), drive the vertical cylinder (22) and the rotating motor (23) to adjust the placement height and placement angle of the cross brace (56) between the combined rod segments, adjust the telescopic plate base (211), and fix the cross brace (56) between the combined rod segments to the combined rod segments; S10: Push the movable lifting support (1) and adjust the movable adjustment frame (2) and the limit bracket (4), and continue to install other lower chord segments (51), web members (52), upper chord segments (53), middle crossbeams (54) and cross braces (56).

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