Continuous bridge cantilever linear control method applying suspension grouting bridge fabrication machine

Abstract

The invention belongs to the technical field of bridge construction, and particularly relates to a continuous bridge cantilever linear control method applying a suspended grouting bridge fabrication machine, and the linear control method comprises the following steps: S2, BIM technology and simulation analysis: building a three-dimensional model of a bridge through a BIM platform, integrating the design parameters, construction progress and structure change information of the bridge in the model, and utilizing a BIM simulation technology to construct a linear model of the bridge; the states of the bridge in different construction stages are simulated, so that potential construction problems are recognized in advance, the construction sequence and method are adjusted, and the stability of the bridge line shape is ensured. According to the continuous bridge cantilever linear control method applying the suspension grouting bridge fabrication machine, under the application of the suspension grouting bridge fabrication machine, through accurate mechanical prediction, dynamic construction simulation and intelligent real-time adjustment, the linear change of a bridge in the cantilever construction process can be effectively controlled, and the high efficiency, precision and safety of bridge construction are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a method for controlling the linear shape of a continuous bridge cantilever using a suspended grouting bridge-building machine. Background Art

[0002] In modern bridge construction, especially in the construction of large-span bridges, the cantilever bridge-building machine, as an important construction equipment, is widely used in the cantilever construction of continuous bridges. The cantilever bridge-building machine has high flexibility and efficiency, and can realize precise lifting and pouring operations of structural components during cantilever operation, which is especially suitable for complex terrain and traffic environments. With the continuous development of bridge construction technology, especially in the design and construction of ultra-large span, ultra-high and complex bridges, the cantilever construction method has gradually become one of the main construction methods.

[0003] During the cantilever construction of continuous beam bridges, ensuring accurate linear shape, prestressed pipe installation specifications and improving construction efficiency are the keys to project quality. However, during the cantilever construction process, due to the influence of factors such as load, temperature change, construction sequence and the deadweight of bridge materials, the cantilever section will undergo certain deformation, which makes the linear control of the bridge more complicated and seriously affects the safety and economy of the bridge. Especially in long span bridge projects, how to effectively control the linear shape of each section of the bridge to avoid tilt, deviation or uneven settlement during construction has become a key issue. Therefore, the present invention solves the shortcomings of the above technical problems. Summary of the invention

[0004] Based on the above-mentioned existing technical problems, the present invention proposes a method for controlling the cantilever linearity of a continuous bridge using a suspended cast-in-place bridge-building machine.

[0005] The present invention proposes a method for controlling the linear shape of a continuous bridge cantilever using a suspended concrete bridge-building machine, the linear shape control method comprising the following steps:

[0006] S1. Establishment of mechanical analysis model: The mechanical modeling method of finite element analysis is adopted, considering the influence of concrete self-weight, prestressed steel tension, construction load, and temperature and humidity changes on bridge deformation. The vertical deflection, lateral deformation and settlement of the bridge are predicted according to the mechanical model at different stages of construction, and a dynamic linear correction strategy is provided.

[0007] S2. BIM technology and simulation analysis: A three-dimensional model of the bridge is created through the BIM platform. The model integrates the design parameters, construction progress, and structural change information of the bridge, providing basic data for linear control during the construction process. BIM simulation technology is used to simulate the status of the bridge at different construction stages, analyze the impact of factors such as concrete pouring, prestressing, and temperature changes on the linear shape, and optimize the construction plan. Through BIM simulation, potential construction problems can be identified in advance, and the construction sequence and methods can be adjusted to ensure the stability of the bridge linear shape.

[0008] S3. Intelligent control and real-time monitoring: By installing displacement sensors, strain gauges, inclinometers, and laser scanners, the displacement, stress, and deformation data of the bridge are collected in real time. The collected data will be transmitted to the central control system in real time. The system analyzes the data through intelligent algorithms. When the control system detects linear deviations, it automatically adjusts the vertical and lateral movement speeds of the bridge and the tensioning strength of the prestressed steel bars to achieve closed-loop control and ensure the accuracy of the bridge line.

[0009] S4. Prestress control and adjustment: At different construction stages, strain sensors are installed to monitor the actual strain of the prestressed steel bars and compare them with the design values. The tensioning timing and tensioning intensity of the prestressed steel bars are controlled by tensioning equipment to compensate for bridge deformation caused by concrete hardening and temperature changes during construction.

[0010] Wherein, the tensioning equipment includes an anchor tensioning jack, the outer surface of the anchor tensioning jack is provided with a rotation adjustment mechanism, the outer surface of the bridge is fixedly mounted with a bridge-building machine main beam, and a displacement adjustment mechanism is provided below the bridge-building machine main beam.

[0011] Wherein, the rotation adjustment mechanism drives the anchor cable tensioning jack to rotate, so that the prestressed steel bar corresponds to the clamping hole of the anchor cable tensioning jack.

[0012] Wherein, the displacement adjustment mechanism drives the anchor cable tensioning jack to move laterally and radially in the horizontal plane, so that the prestressed steel bar is aligned with the clamping hole of the anchor cable tensioning jack.

[0013] Preferably, a corrugated pipe is pre-buried inside the bridge during casting, and when the concrete strength of the bridge reaches more than 75%, the prestressed steel bars are inserted into the corrugated pipe, and load-bearing plates are installed at both ends of the corrugated pipe, and spiral steel bars are sleeved on the outer surface of the load-bearing plates for buffering the corrugated pipe when it is tensioned. An anchor crown is installed on one side of the load-bearing plate, and a wedge is slidably clamped on the perforated inner wall of the anchor crown, and is sleeved on the outer surface of the prestressed steel bar.

[0014] Through the above technical scheme, in order to compensate for the deformation of the bridge caused by the factors of concrete hardening and temperature changes during the construction process, when the bridge is cast, multiple corrugated pipes are pre-buried inside the bridge to facilitate the passage of prestressed steel bars, and the prestressed steel bars are fixed by anchor crowns and wedges. Then, when the concrete strength of the bridge reaches more than 75%, the prestressed steel bars are pulled, and the tensioning timing and tensioning strength of the prestressed steel bars can be controlled under the monitoring of the strain sensor, and the deformation of the bridge can be further realized, so that the cantilever linear shape of the bridge can be controlled.

[0015] Preferably, a connecting steel plate is fixedly connected to the outer surface of one end of the plurality of prestressed steel bars, and the strain sensor is fixedly mounted on the upper surface of the connecting steel plate.

[0016] Through the above technical solution, strain sensors are installed on prestressed steel bars to monitor the strain changes of the prestressed steel bars in real time. The working principle of the strain sensor is to detect the slight deformation of the steel bars and infer the actual tensioning force and prestress distribution, so that multiple prestressed steel bars can be integrated by connecting steel plates.

[0017] Preferably, the rotation adjustment mechanism includes a gantry frame rotatably connected to the outer surface of the anchor tensioning jack cylinder through a bearing, a connecting block is fixedly connected to the upper surface of the gantry frame, a lifting platform is arranged above the connecting block, and a hydraulic pump is installed on the upper surface of the lifting platform.

[0018] Through the above technical scheme, in order to support the anchor tensioning jack when it rotates, a gantry is rotated on the outer surface of the anchor tensioning jack to realize its rotation, and the anchor tensioning jack is hoisted by hoisting the gantry. In order to control the anchor tensioning jack to realize the tensioning of the prestressed steel bars, the hydraulic pump on the hoisting platform is connected to the hydraulic interface of the anchor tensioning jack through a hydraulic oil pipe. After the anchor tensioning jack fixes the prestressed steel bars, the hydraulic pump completes the tensioning of the prestressed steel bars by the anchor tensioning jack by delivering hydraulic oil.

[0019] Preferably, the rotation adjustment mechanism also includes a driven gear ring fixedly sleeved on the outer surface of both ends of the cylinder of the anchor tensioning jack, one end surface of the portal frame is rotatably connected to a driving shaft through a bearing, and driving gears are fixedly sleeved on the outer surfaces of both ends of the driving shaft, and the driving gear is meshed with the driven gear ring.

[0020] Through the above technical scheme, in order to drive the anchor cable tensioning jack to rotate and realize the correspondence between the prestressed steel bars and the clamping holes of the anchor cable tensioning jack, an infrared sensor is installed on the surface of the side of the gantry opposite to the bridge to monitor the positions of the prestressed steel bars and the anchor cable tensioning jack, and then the driving shaft is controlled to rotate so that it drives the two active gears to rotate synchronously, so that the driven gear ring engaged with it drives the anchor cable tensioning jack to rotate stably, thereby realizing the correspondence between the prestressed steel bars and the clamping holes of the anchor cable tensioning jack.

[0021] Preferably, the lower surface of the gantry is fixedly connected to a mounting base plate, the upper surface of the mounting base plate is fixedly connected to a reduction motor, and the outer surface of the output shaft of the reduction motor is transmission-connected to the outer surface of the drive shaft via a pulley assembly.

[0022] Through the above technical solution, in order to control the rotation of the driving shaft to drive the anchor cable tensioning jack, the reduction motor is controlled to operate so that it controls the driving shaft to rotate under the linkage of the pulley assembly.

[0023] Preferably, the displacement adjustment mechanism comprises a radial hole and an axial hole which are opened through the surface of the connection block, and a movable shaft is slidably sleeved on the inner walls of the radial hole and the axial hole.

[0024] Through the above technical scheme, in order to achieve the position alignment of the anchor cable tensioning jack and the prestressed steel bar, after the bridge-building machine lowers the anchor cable tensioning jack, its position is accurately adjusted through the displacement adjustment mechanism, that is, the radial moving shaft and the axial moving shaft are driven to move horizontally in turn, thereby driving the connecting block to move horizontally, and then the anchor cable tensioning jack on the surface of the gantry can be driven and after alignment, the anchor cable tensioning jack is driven to rotate through the rotation adjustment mechanism to make it correspond to the position of the prestressed steel bar.

[0025] Preferably, the displacement adjustment mechanism also includes two radial screws and two axial screws rotatably connected to the lower surface of the lifting platform through support blocks with inconsistent heights, and the two end surfaces of the two movable shafts are respectively fixedly connected with threaded pipe blocks, and the threaded pipe blocks are threadedly sleeved on the outer surfaces of the corresponding radial screws and the axial screws.

[0026] Through the above technical scheme, in order to drive the stable horizontal movement of the anchor cable tensioning jack under the connecting block, when the two radial screws are driven to rotate synchronously, the threaded pipe blocks at both ends of the upper axial movable shaft move radially on the outer surface of the radial screw, and then the connecting block slides on the outer surface of the radial screw to achieve radial horizontal movement. Similarly, when the two axial screws rotate, the axial horizontal movement of the connecting block can be finally achieved, thereby realizing the horizontal displacement adjustment of the anchor cable tensioning jack.

[0027] Preferably, the displacement adjustment mechanism also includes a radial motor and an axial motor fixedly connected to the lower surface of the lifting platform, the outer surface of the output shaft of the radial motor is fixedly connected to the outer surface of one of the radial screws through a coupling, the outer surface of the output shaft of the axial motor is fixedly connected to the outer surface of one of the axial screws through a coupling, and the outer surfaces of the two radial screws and the outer surfaces of the two axial screws are both transmission-connected with a transmission assembly.

[0028] Through the above technical scheme, in order to drive the two radial screws to rotate synchronously with the two axial screws, the transmission assembly includes a transmission wheel fixedly connected to the outer surface of the screw and a transmission belt sleeved on the outer surface of the transmission wheel. Then, the radial motor and the axial motor are respectively actuated, and the two radial screws and the two axial screws can be rotated synchronously under the linkage of the transmission assembly, so that the connecting block can be controlled to drive the anchor cable tensioning jack to realize displacement adjustment.

[0029] Preferably, the upper surface of the lifting platform is symmetrically distributed and fixedly connected with hooks, the upper surface of the hooks is fixedly connected with hydraulic booms, and the hydraulic booms are installed on the upper surface of the main beam of the bridge-building machine.

[0030] Through the above technical solution, in order to achieve the alignment of the anchor tensioning jack and the prestressed steel bar, the lifting platform is lowered through the hydraulic hanger to adjust the vertical displacement of the anchor tensioning jack, thereby ensuring the accuracy of the prestressing.

[0031] The beneficial effects of the present invention are:

[0032] 1. By combining mechanical analysis models, BIM technology simulation analysis and intelligent control technology, a comprehensive cantilever linear control method is provided. With the application of the cantilever bridge construction machine, through accurate mechanical prediction, dynamic construction simulation and intelligent real-time adjustment, the bridge linear change during the cantilever construction process can be effectively controlled to ensure the efficiency, accuracy and safety of bridge construction. This comprehensive technical solution can improve construction efficiency, reduce errors and risks during the construction process, and provide reliable technical support for large-scale bridge projects such as high-speed railways.

[0033] 2. By setting a rotation adjustment mechanism, the anchor cable tensioning jack can be rotated to make the prestressed steel bar correspond to the clamping hole of the anchor cable tensioning jack. During the adjustment process, the reduction motor is operated to control the driving shaft to rotate under the linkage of the pulley assembly, so that the two driving gears are driven to rotate synchronously, so that the driven gear ring engaged with it drives the anchor cable tensioning jack to rotate stably, so that the prestressed steel bar corresponds to the clamping hole of the anchor cable tensioning jack, and then the prestressed steel bar is tensioned to control the linear shape of the bridge cantilever.

[0034] 3. By setting up a displacement adjustment mechanism, the anchor cable tensioning jack can be driven to move laterally and radially in the horizontal plane, so that the prestressed steel bar and the clamping hole of the anchor cable tensioning jack are aligned. During the adjustment process, the radial motor and the axial motor are respectively operated, and the two radial screws and the two axial screws can be rotated synchronously under the linkage of the transmission component, so that the connecting block is controlled to drive the anchor cable tensioning jack to achieve displacement adjustment, thereby ensuring the accuracy of prestressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a method for controlling the linear shape of a continuous bridge cantilever using a suspended cast-in-place bridge-building machine proposed by the present invention;

[0036] Figure 2 A three-dimensional diagram of a prestressed steel bar structure using a method for controlling the linear shape of a continuous bridge cantilever using a suspended cast-in-place bridge-building machine proposed by the present invention;

[0037] Figure 3 A three-dimensional diagram of the structure of a strain sensor for a method of controlling the linear shape of a continuous bridge cantilever using a suspended concrete bridge-building machine proposed by the present invention;

[0038] Figure 4 A three-dimensional diagram of the structure of a corrugated pipe in a method for controlling the linear shape of a continuous bridge cantilever using a suspended grouting bridge-building machine proposed by the present invention;

[0039] Figure 5 A stereoscopic diagram of an anchor crown structure of a method for controlling the linear shape of a continuous bridge cantilever using a suspended grouting bridge-building machine proposed by the present invention;

[0040] Figure 6 A three-dimensional diagram of a gantry structure of a method for controlling the linear shape of a continuous bridge cantilever using a suspended grouting bridge-building machine proposed by the present invention;

[0041] Figure 7 A three-dimensional diagram of the driving shaft structure of a method for controlling the linear shape of a continuous bridge cantilever using a suspended concrete bridge-building machine proposed by the present invention;

[0042] Figure 8 A three-dimensional diagram of the driven gear ring structure of a method for linear control of a continuous bridge cantilever using a suspended concrete bridge-building machine proposed by the present invention;

[0043] Fig. 9 A three-dimensional diagram of the hydraulic pump structure of a method for controlling the linear shape of a continuous bridge cantilever using a suspended grouting bridge-building machine proposed by the present invention;

[0044] Fig.10 A three-dimensional diagram of the axial screw structure of a method for controlling the linear shape of a continuous bridge cantilever using a suspended grouting bridge-building machine proposed by the present invention;

[0045] Fig.11A three-dimensional diagram of the connection block structure of a method for controlling the linear shape of a continuous bridge cantilever using a suspended cast-in-place bridge-building machine proposed in the present invention.

[0046] In the figure: 1. prestressed steel bar; 2. anchor cable tensioning jack; 3. main beam of bridge-building machine; 4. rotation adjustment mechanism; 41. portal frame; 42. connecting block; 43. lifting platform; 44. hydraulic pump; 45. driven gear ring; 46. driving shaft; 47. driving gear; 48. mounting base plate; 49. reduction motor; 491. pulley assembly; 5. corrugated pipe; 51. load-bearing plate; 52. spiral steel bar; 53. anchor crown; 54. wedge; 55. connecting steel plate; 56. strain sensor; 6. displacement adjustment mechanism; 61. radial hole; 62. axial hole; 63. moving shaft; 64. radial screw; 65. axial screw; 66. threaded pipe block; 67. radial motor; 68. axial motor; 69. transmission assembly; 70. hook; 71. hydraulic boom. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0048] A method for controlling the linear shape of a continuous bridge cantilever using a suspended concrete bridge-building machine, the linear shape control method comprising the following steps:

[0049] S1. Establishment of mechanical analysis model: The mechanical modeling method of finite element analysis is adopted, considering the influence of concrete self-weight, prestressed steel bar tension, construction load, and temperature and humidity changes on bridge deformation. The vertical deflection, lateral deformation and settlement of the bridge are predicted according to the mechanical model at different stages of construction, and a dynamic linear correction strategy is provided.

[0050] S2. BIM technology and simulation analysis: A three-dimensional model of the bridge is created through the BIM platform. The model integrates the design parameters, construction progress, and structural change information of the bridge, providing basic data for linear control during the construction process. BIM simulation technology is used to simulate the status of the bridge at different construction stages, analyze the impact of factors such as concrete pouring, prestressing, and temperature changes on the linear shape, and optimize the construction plan. Through BIM simulation, potential construction problems can be identified in advance, and the construction sequence and methods can be adjusted to ensure the stability of the bridge linear shape.

[0051] S3. Intelligent control and real-time monitoring: By installing displacement sensors, strain gauges, inclinometers, and laser scanners, the displacement, stress, and deformation data of the bridge are collected in real time. The collected data will be transmitted to the central control system in real time. The system analyzes the data through intelligent algorithms. When the control system detects linear deviations, it automatically adjusts the vertical and lateral movement speeds of the bridge and the tensioning strength of the prestressed steel bars to achieve closed-loop control and ensure the accuracy of the bridge line.

[0052] S4. Prestress control and adjustment: At different construction stages, strain sensors 56 are installed to monitor the actual strain of the prestressed steel bars 1 and compare them with the design values. The tensioning timing and tensioning intensity of the prestressed steel bars 1 are controlled by tensioning equipment to compensate for bridge deformation caused by concrete hardening and temperature changes during construction.

[0053] Reference Figure 1-Figure 11 In order to compensate for the deformation of the bridge caused by the hardening of concrete and temperature changes during the construction process, a corrugated pipe 5 is pre-buried inside the bridge during pouring. When the concrete strength of the bridge reaches more than 75%, the prestressed steel bar 1 is inserted into the corrugated pipe 5. Both ends of the corrugated pipe 5 are installed with a load-bearing plate 51, and the outer surface of the load-bearing plate 51 is sleeved with a spiral steel bar 52 for buffering the corrugated pipe 5 when it is tensioned. An anchor crown 53 is installed on one side of the load-bearing plate 51, and the perforated inner wall sliding card of the anchor crown 53 A wedge 54 is connected and sleeved on the outer surface of the prestressed steel bar 1. When the bridge is cast, a plurality of corrugated pipes 5 are embedded inside the bridge to facilitate the passage of the prestressed steel bar 1, and the prestressed steel bar 1 is fixed by the anchor crown 53 and the wedge 54. When the concrete strength of the bridge reaches more than 75%, the prestressed steel bar 1 is pulled, and the tensioning timing and tensioning strength of the prestressed steel bar 1 can be controlled under the monitoring of the strain sensor 56, and the deformation of the bridge can be further realized, so that the cantilever linear shape of the bridge can be controlled.

[0054] A connecting steel plate 55 is fixedly connected to the outer surface of one end of the plurality of prestressed steel bars 1, and a strain sensor 56 is fixedly installed on the upper surface of the connecting steel plate 55. The strain sensor 56 is installed on the prestressed steel bar 1 to monitor the strain changes of the prestressed steel bar 1 in real time. The working principle of the strain sensor 56 is to detect the slight deformation of the steel bar and infer the actual tensioning force and prestress distribution, so that the connecting steel plate 55 can integrate the plurality of prestressed steel bars 1.

[0055] By combining mechanical analysis models, BIM technology simulation analysis and intelligent control technology, a comprehensive cantilever linear control method is provided. With the application of the cantilever bridge construction machine, through accurate mechanical prediction, dynamic construction simulation and intelligent real-time adjustment, the bridge linear change during the cantilever construction process can be effectively controlled to ensure the efficiency, accuracy and safety of bridge construction. This comprehensive technical solution can improve construction efficiency, reduce errors and risks during the construction process, and provide reliable technical support for large-scale bridge projects such as high-speed railways.

[0056] Among them, the tensioning equipment includes an anchor tensioning jack 2, the outer surface of which is provided with a rotation adjustment mechanism 4, a bridge-building machine main beam 3 is fixedly installed on the outer surface of the bridge, and a displacement adjustment mechanism 6 is provided below the bridge-building machine main beam 3.

[0057] The rotation adjustment mechanism 4 drives the anchor cable tensioning jack 2 to rotate, so that the prestressed steel bar 1 corresponds to the clamping hole of the anchor cable tensioning jack 2.

[0058] In order to support the anchor tensioning jack 2 when it rotates, the rotation adjustment mechanism 4 includes a gantry 41 which is rotatably connected to the outer surface of the cylinder of the anchor tensioning jack 2 through a bearing. The gantry 41 is rotatably sleeved on the outer surface of the anchor tensioning jack 2 to realize its rotation, and the lifting of the anchor tensioning jack 2 is realized by lifting the gantry 41. In order to control the anchor tensioning jack 2 to achieve the tensioning of the prestressed steel bar 1, a connecting block 42 is fixedly connected to the upper surface of the gantry 41, and a lifting platform 43 is arranged above the connecting block 42. A hydraulic pump 44 is installed on the upper surface of the lifting platform 43. The hydraulic pump 44 on the lifting platform 43 is connected to the hydraulic interface of the anchor tensioning jack 2 through a hydraulic oil pipe. Therefore, after the anchor tensioning jack 2 fixes the prestressed steel bar 1, the hydraulic pump 44 completes the tensioning of the prestressed steel bar 1 driven by the anchor tensioning jack 2 by conveying hydraulic oil.

[0059] In order to drive the anchor cable tensioning jack 2 to rotate and realize the correspondence between the prestressed steel bar 1 and the clamping hole of the anchor cable tensioning jack 2, the rotation adjustment mechanism 4 also includes a driven gear ring 45 fixedly sleeved on the outer surface of the two ends of the cylinder of the anchor cable tensioning jack 2, and one end surface of the portal frame 41 is rotatably connected with a driving shaft 46 through a bearing, and the outer surfaces of both ends of the driving shaft 46 are fixedly sleeved with driving gears 47, and the driving gear 47 is meshed with the driven gear ring 45. An infrared sensor is installed on the surface of the side of the portal frame 41 opposite to the bridge to monitor the positions of the prestressed steel bar 1 and the anchor cable tensioning jack 2, and then the driving shaft 46 is controlled to rotate so that it drives the two driving gears 47 to rotate synchronously, so that the driven gear ring 45 meshed with it drives the anchor cable tensioning jack 2 to rotate stably, so that the prestressed steel bar 1 and the clamping hole of the anchor cable tensioning jack 2 correspond.

[0060] In order to control the rotation of the driving shaft 46 and realize the driving of the anchor cable tensioning jack 2, the lower surface of the gantry 41 is fixedly connected with a mounting base 48, and the upper surface of the mounting base 48 is fixedly connected with a reduction motor 49. The outer surface of the output shaft of the reduction motor 49 and the outer surface of the driving shaft 46 are transmission-connected by a pulley assembly 491. The reduction motor 49 is controlled to rotate so that it controls the driving shaft 46 to realize rotation under the linkage of the pulley assembly 491.

[0061] By setting up the rotation adjustment mechanism 4, the anchor cable tensioning jack 2 can be rotated to make the prestressed steel bar 1 correspond to the clamping hole of the anchor cable tensioning jack 2. During the adjustment process, the reduction motor 49 is actuated to control the driving shaft 46 to rotate under the linkage of the pulley assembly 491, so that it drives the two driving gears 47 to rotate synchronously, so that the driven gear ring 45 engaged therewith drives the anchor cable tensioning jack 2 to rotate stably, so that the prestressed steel bar 1 corresponds to the clamping hole of the anchor cable tensioning jack 2, and then the prestressed steel bar 1 is tensioned, so that it can control the linear shape of the bridge cantilever.

[0062] The displacement adjustment mechanism 6 drives the anchor cable tensioning jack 2 to move laterally and radially in the horizontal plane, so that the prestressed steel bar 1 is aligned with the clamping hole of the anchor cable tensioning jack 2.

[0063] In order to achieve the position alignment of the anchor tensioning jack 2 and the prestressed steel bar 1, the displacement adjustment mechanism 6 includes a radial hole 61 and an axial hole 62 which are penetrated and opened on the surface of the connecting block 42. The inner walls of the radial hole 61 and the axial hole 62 are slidably sleeved with a moving shaft 63. After the bridge-building machine lowers the anchor tensioning jack 2, its position is accurately adjusted by the displacement adjustment mechanism 6, that is, the radial moving shaft 63 and the axial moving shaft 63 are driven horizontally in turn, thereby driving the connecting block 42 to move horizontally, and then the anchor tensioning jack 2 on the surface of the gantry 41 can be driven and after alignment, the anchor tensioning jack 2 is driven to rotate by the rotation adjustment mechanism 4 to make it correspond to the position of the prestressed steel bar 1.

[0064] In order to drive the stable horizontal movement of the anchor cable tensioning jack 2 under the connecting block 42, the displacement adjustment mechanism 6 also includes two radial screws 64 and two axial screws 65 which are rotatably connected to the lower surface of the lifting platform 43 through support blocks with inconsistent heights. The two end surfaces of the two moving shafts 63 are respectively fixedly connected with threaded pipe blocks 66, and the threaded pipe blocks 66 are threadedly sleeved on the outer surfaces of the corresponding radial screws 64 and axial screws 65. When the two radial screws 64 are driven to rotate synchronously, the threaded pipe blocks 66 at both ends of the upper axial moving shaft 63 move radially on the outer surface of the radial screw 64, and then the connecting block 42 slides on the outer surface of the radial screw 64 to achieve radial horizontal movement. Similarly, when the two axial screws 65 rotate, the axial horizontal movement of the connecting block 42 can be finally achieved, thereby realizing the horizontal displacement adjustment of the anchor cable tensioning jack 2.

[0065] In order to drive the two radial screws 64 and the two axial screws 65 to rotate synchronously, the displacement adjustment mechanism 6 also includes a radial motor 67 and an axial motor 68 fixedly connected to the lower surface of the lifting platform 43. The outer surface of the output shaft of the radial motor 67 is fixedly connected to the outer surface of one of the radial screws 64 through a coupling, and the outer surface of the output shaft of the axial motor 68 is fixedly connected to the outer surface of one of the axial screws 65 through a coupling. The outer surfaces of the two radial screws 64 and the outer surfaces of the two axial screws 65 are both transmission-connected with a transmission assembly 69. The transmission assembly 69 includes a transmission wheel fixedly connected to the outer surface of the screw and a transmission belt sleeved on the outer surface of the transmission wheel. Then, the radial motor 67 and the axial motor 68 are respectively actuated, and the two radial screws 64 and the two axial screws 65 can be rotated synchronously under the linkage of the transmission assembly 69, so that it controls the connecting block 42 to drive the anchor cable tensioning jack 2 to achieve displacement adjustment.

[0066] In order to achieve the alignment of the anchor cable tensioning jack 2 and the prestressed steel bar 1, the upper surface of the lifting platform 43 is symmetrically distributed and fixedly connected with hooks 70, and the upper surface of the hooks 70 is fixedly connected with a hydraulic boom 71. The hydraulic boom 71 is installed on the upper surface of the main beam 3 of the bridge-building machine. The lifting platform 43 is lowered by the hydraulic boom 71 to adjust the displacement of the anchor cable tensioning jack 2 in the vertical direction, thereby ensuring the accuracy of prestressing.

[0067] By setting up a displacement adjustment mechanism 6, the anchor cable tensioning jack 2 can be driven to move laterally and radially in the horizontal plane, so that the prestressed steel bar 1 is aligned with the clamping hole of the anchor cable tensioning jack 2. During the adjustment process, the radial motor 67 and the axial motor 68 are respectively operated, and the two radial screws 64 and the two axial screws 65 can be rotated synchronously under the linkage of the transmission component 69, so that the connecting block 42 is controlled to drive the anchor cable tensioning jack 2 to achieve displacement adjustment, thereby ensuring the accuracy of prestressing.

[0068] Working principle: In a specific embodiment of the present invention, when the concrete strength of the bridge reaches more than 75%, the cantilever section will be deformed to a certain extent due to the influence of factors such as load, temperature change, construction sequence and the deadweight of the bridge material. At this time, the actual strain of the prestressed steel bar 1 is monitored by the strain sensor 56 connected to the steel plate 55, and compared with the design value. The tensioning timing and tensioning strength of the prestressed steel bar 1 are controlled by the tensioning equipment to compensate for the deformation of the bridge caused by the factors of concrete hardening and temperature change during the construction process;

[0069] When the tensioning equipment is tensioning the prestressed steel bar 1, the lifting platform 43 is lowered through the hydraulic suspender 71 to adjust the displacement of the anchor tensioning jack 2 in the vertical direction so that the anchor tensioning jack 2 and the prestressed steel bar 1 are on the same horizontal line;

[0070] Then, the horizontal position of the anchor cable tensioning jack 2 is adjusted, that is, when the radial motor 67 synchronously drives the two radial screws 64 to rotate through the transmission assembly 69, the threaded tube blocks 66 at both ends of the upper axial movable shaft 63 radially move on the outer surface of the radial screw 64, and then the connecting block 42 slides on the outer surface of the radial screw 64 to achieve radial horizontal movement. Similarly, when the two axial screws 65 rotate, the axial horizontal movement of the connecting block 42 can be finally achieved, thereby achieving the horizontal displacement adjustment of the anchor cable tensioning jack 2, so that the prestressed steel bar 1 is aligned with the clamping hole of the anchor cable tensioning jack 2;

[0071] Finally, the reduction motor 49 is activated to control the driving shaft 46 to rotate under the linkage of the pulley assembly 491, so that it drives the two driving gears 47 to rotate synchronously, so that the driven gear ring 45 meshing therewith drives the anchor cable tensioning jack 2 connected to the surface of the portal frame 41 to rotate stably, so that the prestressed steel bar 1 corresponds to the clamping hole of the anchor cable tensioning jack 2, and then the prestressed steel bar 1 is tensioned, so that it can control the linear shape of the bridge cantilever.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for controlling the cantilever linearity of a continuous bridge using a suspended concrete bridge-building machine, characterized in that: The linear control method comprises the following steps: S1. Establishment of mechanical analysis model: The mechanical modeling method of finite element analysis is adopted, taking into account the influence of concrete deadweight, prestressed steel bar (1) tension, construction load, and temperature and humidity changes on bridge deformation. The vertical deflection, lateral deformation and settlement of the bridge are predicted according to the mechanical model at different stages of construction, and a dynamic linear correction strategy is provided; S2. BIM technology and simulation analysis: Create a three-dimensional model of the bridge through the BIM platform. The model integrates the design parameters, construction progress, and structural change information of the bridge, providing basic data for linear control during the construction process. Use BIM simulation technology to simulate the state of the bridge at different construction stages, analyze the impact of factors such as concrete pouring, prestressing, and temperature changes on the linear shape, and optimize the construction plan. Through BIM simulation, identify potential construction problems in advance, and adjust the construction sequence and methods to ensure the stability of the bridge linear shape; S3. Intelligent control and real-time monitoring: By installing displacement sensors, strain gauges, inclinometers, and laser scanners, the displacement, stress, and deformation data of the bridge are collected in real time. The collected data will be transmitted to the central control system in real time. The system analyzes the data through intelligent algorithms. When the control system detects linear deviation, it automatically adjusts the vertical and lateral movement speed of the bridge and the tensioning force of the prestressed steel bars (1) to achieve closed-loop control and ensure the accuracy of the bridge linear shape. S4, prestress control and adjustment: at different construction stages, a strain sensor (56) is installed to monitor the actual strain of the prestressed steel bar (1), and the actual strain is compared with the design value. The tensioning timing and tensioning strength of the prestressed steel bar (1) are controlled by tensioning equipment to compensate for the deformation of the bridge caused by factors such as concrete hardening and temperature changes during the construction process; The tensioning equipment comprises an anchor cable tensioning jack (2), the outer surface of the anchor cable tensioning jack (2) is provided with a rotation adjustment mechanism (4), the outer surface of the bridge is fixedly mounted with a bridge-building machine main beam (3), and a displacement adjustment mechanism (6) is provided below the bridge-building machine main beam (3); The rotation adjustment mechanism (4) drives the anchor cable tensioning jack (2) to rotate, so that the prestressed steel bar (1) corresponds to the clamping hole of the anchor cable tensioning jack (2); The displacement adjustment mechanism (6) drives the anchor cable tensioning jack (2) to move laterally and radially in a horizontal plane, so that the prestressed steel bar (1) is aligned with the clamping hole of the anchor cable tensioning jack (2).

2. The method for controlling the cantilever line shape of a continuous bridge using a suspended concrete bridge-building machine according to claim 1, characterized in that: When the bridge is cast, a corrugated pipe (5) is embedded in the bridge. When the concrete strength of the bridge reaches 75% or more, the prestressed steel bar (1) is inserted into the corrugated pipe (5). Both ends of the corrugated pipe (5) are provided with load-bearing plates (51), and spiral steel bars (52) are sleeved on the outer surface of the load-bearing plates (51) for buffering the corrugated pipe (5) when the corrugated pipe (5) is tensioned. An anchor crown (53) is installed on one side of the load-bearing plates (51). A wedge (54) is slidably engaged with the perforated inner wall of the anchor crown (53), and is sleeved on the outer surface of the prestressed steel bar (1).

3. The method for controlling the cantilever linearity of a continuous bridge using a suspended concrete bridge-building machine according to claim 1, characterized in that: A connecting steel plate (55) is fixedly connected to the outer surface of one end of the plurality of prestressed steel bars (1), and the strain sensor (56) is fixedly mounted on the upper surface of the connecting steel plate (55).

4. The method for controlling the cantilever linearity of a continuous bridge using a suspended concrete bridge-building machine according to claim 1, characterized in that: The rotation adjustment mechanism (4) comprises a gantry (41) rotatably connected to the outer surface of the cylinder of the anchor cable tensioning jack (2) via a bearing, a connecting block (42) being fixedly connected to the upper surface of the gantry (41), a lifting platform (43) being arranged above the connecting block (42), and a hydraulic pump (44) being installed on the upper surface of the lifting platform (43).

5. The method for controlling the cantilever linearity of a continuous bridge using a suspended concrete bridge-building machine according to claim 4, characterized in that: The rotation adjustment mechanism (4) also includes a driven gear ring (45) fixedly sleeved on the outer surfaces of both ends of the cylinder of the anchor cable tensioning jack (2); one end surface of the gantry (41) is rotatably connected to a driving shaft (46) via a bearing; both ends of the driving shaft (46) are fixedly sleeved with driving gears (47); the driving gear (47) is meshed with the driven gear ring (45).

6. A method for controlling the cantilever line shape of a continuous bridge using a suspended concrete bridge-building machine according to claim 5, characterized in that: The lower surface of the gantry (41) is fixedly connected to a mounting base plate (48), the upper surface of the mounting base plate (48) is fixedly connected to a reduction motor (49), and the outer surface of the output shaft of the reduction motor (49) and the outer surface of the driving shaft (46) are transmission-connected via a pulley assembly (491).

7. A method for controlling the cantilever line shape of a continuous bridge using a suspended concrete bridge-building machine according to claim 6, characterized in that: The displacement adjustment mechanism (6) comprises a radial hole (61) and an axial hole (62) which are opened through the surface of the connection block (42); the inner walls of the radial hole (61) and the axial hole (62) are both slidably sleeved with a moving shaft (63).

8. The method for controlling the cantilever line shape of a continuous bridge using a suspended concrete bridge-building machine according to claim 7, characterized in that: The displacement adjustment mechanism (6) also includes two radial screws (64) and two axial screws (65) which are rotatably connected to the lower surface of the lifting platform (43) through support blocks with inconsistent heights. The two end surfaces of the two movable shafts (63) are respectively fixedly connected with threaded pipe blocks (66), and the threaded pipe blocks (66) are threadedly sleeved on the outer surfaces of the corresponding radial screws (64) and the axial screws (65).

9. A method for controlling the cantilever line shape of a continuous bridge using a suspended concrete bridge-building machine according to claim 8, characterized in that: The displacement adjustment mechanism (6) also includes a radial motor (67) and an axial motor (68) fixedly connected to the lower surface of the lifting platform (43); the outer surface of the output shaft of the radial motor (67) is fixedly connected to the outer surface of one of the radial screws (64) through a coupling; the outer surface of the output shaft of the axial motor (68) is fixedly connected to the outer surface of one of the axial screws (65) through a coupling; the outer surfaces of the two radial screws (64) and the outer surfaces of the two axial screws (65) are both transmission-connected with a transmission assembly (69).

10. The method for controlling the cantilever linearity of a continuous bridge using a suspended concrete bridge-building machine according to claim 9, characterized in that: The upper surface of the lifting platform (43) is symmetrically distributed and fixedly connected with hooks (70), and the upper surface of the hooks (70) is fixedly connected with hydraulic booms (71), and the hydraulic booms (71) are installed on the upper surface of the main beam (3) of the bridge-building machine.

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