Cable-stayed bridge catwalk bearing cable linear adjustment device and linear adjustment method

Abstract

This invention discloses a device and method for adjusting the alignment of the catwalk load-bearing cables of a suspension bridge. The alignment adjustment device includes a side-span cable adjustment mechanism installed on the side-span anchorage, a tower-top cable adjustment mechanism installed on the tower, and a main control box electrically connected to the side-span and tower-top cable adjustment mechanisms. This invention uses the side-span and tower-top cable adjustment mechanisms to adjust the anchorage ends and mid-span sections of the catwalk load-bearing cables, respectively. The side-span and tower-top cable adjustment mechanisms determine the adjustment data by comparing model data and measured data of the catwalk load-bearing cables. By tightening or loosening the catwalk load-bearing cables, the alignment of the catwalk load-bearing cables is changed, effectively improving the accuracy of the adjustment work, reducing labor costs, and increasing the efficiency of the adjustment work. This ensures that the alignment of the catwalk and the main cable remains consistent throughout the entire construction process from initial installation to completion, effectively improving the safety and convenience of suspension bridge construction.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering construction technology, and in particular to a device for adjusting the alignment of the catenary load-bearing cables of a suspension bridge and a method for adjusting the alignment of the catenary load-bearing cables of a suspension bridge. Background Technology

[0002] Catwalks are aerial work platforms and passageways used in the construction of suspension bridges. They are large-scale temporary works for the construction of the suspension bridge's superstructure. The catwalk load-bearing cables are the most important load-bearing cable structure of the catwalk, directly affecting its overall alignment. The overall alignment of the catwalk system is directly related to the construction safety and convenience of the suspension bridge's superstructure. The forming precision of the catwalk load-bearing cables plays a decisive role in the catwalk's functionality. For example... Figure 1 As shown, the alignment of the catwalk load-bearing cable is affected by factors such as deviations in material mechanical properties, cutting errors, installation errors, structural load deviations, anchorage tension, and ambient temperature. This results in a certain degree of deviation between the actual alignment of the catwalk load-bearing cable after erection and its designed alignment, which can significantly impact construction safety and convenience.

[0003] Chinese invention application CN104631329A discloses a method for adjusting the overall alignment of a continuous catwalk for a suspension bridge. The method includes: after the entire catwalk is erected, installing several jacks at the connection points between each catwalk load-bearing cable and the anchorage; then using the jacks to tension or relax each catwalk load-bearing cable multiple times; next, installing a guide chain at the top of each catwalk load-bearing cable on the main tower, and simultaneously manually pulling all guide chains to adjust the overall alignment of each catwalk load-bearing cable in the desired direction; continuing this alternating adjustment process multiple times until the overall alignment of the catwalk reaches the designed alignment. The technical solution disclosed in this patent application requires manual pulling of the guide chains, which still involves human error, resulting in low adjustment accuracy and a high labor cost.

[0004] Chinese utility model patent document CN206986721U discloses a catwalk load-bearing cable adjustment device at the catwalk cable saddle at the top of a tower. The catwalk load-bearing cable has two catwalk cable saddles at the top of the tower, each with a clamp. The catwalk load-bearing cable is mounted on the saddles. The device includes a first clamp fixed to the catwalk load-bearing cable. The upper part of the first clamp is located between the two catwalk cable saddles, and the lower part passes through a steel bar, connecting to the two catwalk cable saddles at both ends of the steel bar. A jack is mounted on the steel bar, installed between the catwalk cable saddle near the side span and the first clamp. This utility model's disclosed technical solution only allows for linear adjustment at the top of the tower, and the anchoring ends of the catwalk load-bearing cable are all manually adjusted. However, the anchoring ends of the catwalk load-bearing cable bear a large load, and the frictional resistance during adjustment is high, making manual adjustment difficult and causing significant wear to the catwalk load-bearing cable.

[0005] The technical solutions disclosed in the above patents all require manual cable adjustment, which is difficult and the accuracy of cable adjustment is affected by human operation errors. They fail to solve the technical problem that the actual shape of the catwalk load-bearing cable deviates from the design shape. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a suspension bridge catwalk load-bearing cable alignment adjustment device that is convenient to adjust and has accurate cable alignment.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a linear adjustment device for the catwalk load-bearing cables of a suspension bridge, wherein the suspension bridge includes catwalk load-bearing cables, towers and side span anchorages, multiple catwalk load-bearing cables are parallel and suspended between two sets of side span anchorages, the two ends of the catwalk load-bearing cables are fixedly connected to the two sets of side span anchorages respectively, two towers are located between the two sets of side span anchorages and support the catwalk load-bearing cables, and also includes a side span cable adjustment mechanism set on the side span anchorages, a tower top cable adjustment mechanism set on the towers, and a main control box electrically connected to the side span cable adjustment mechanism and the tower top cable adjustment mechanism;

[0008] The side span cable adjustment mechanism includes a connecting rod and a jacking drive component. The connecting rod is fixed on the side span anchorage, and the jacking drive component is fixed on the connecting rod. The output end of the jacking drive component is connected to the catwalk load-bearing cable. The jacking drive component can drive the catwalk load-bearing cable to extend and retract in the extension direction of the connecting rod.

[0009] The tower top cable adjustment mechanism includes at least two cable saddles fixed to the top of the tower and spaced apart along the extension direction of the catwalk load-bearing cable. The cable saddles support the catwalk load-bearing cable and are equipped with lifting parts that can be raised to vertically lift the catwalk load-bearing cable. Between adjacent cable saddles are sliding push-pull parts that can be moved to push and pull the catwalk load-bearing cable along its length.

[0010] As an improvement to the above scheme: the side span cable adjustment mechanism further includes an anchoring lug plate and a connecting plate. The anchoring lug plate is anchored on the side span anchor and is detachably connected to the connecting rod through the connecting plate. The connecting plate is connected to the connecting rod, and the output end of the jacking drive component is detachably connected to the catwalk load-bearing cable through the connecting plate.

[0011] As an improvement to the above solution: the tower top cable adjustment mechanism also includes a limit lock corresponding to the cable saddle. The limit lock includes a fixing part fixed on the corresponding cable saddle and a locking part detachably connected to the fixing part by a locking screw. Multiple catwalk load-bearing cables pass side by side between the fixing part and the locking part.

[0012] As an improvement to the above solution: the top surface of the cable saddle is an arc surface, and the top of the cable saddle is provided with a limiting groove corresponding to the catwalk load-bearing cable. The limiting grooves are evenly distributed along the length direction of the catwalk load-bearing cable, and the catwalk load-bearing cable passes through the corresponding limiting groove. The cable saddle is also provided with an installation groove, in which a lifting drive component is fixed. The output end of the lifting drive component is connected to the lifting part. When the lifting drive component is not activated, the top of the lifting part is flush with the bottom of the limiting groove. It also includes a push-pull drive component. A connecting slide rod is fixed between adjacent cable saddles. The push-pull drive component is slidably mounted on the connecting slide rod, and the output end of the push-pull drive component is connected to the push-pull part.

[0013] As an improvement to the above solution: the lifting part is provided with multiple rotatable lifting guide wheels, and the circumference of the lifting guide wheels is provided with radially concave sliding grooves. The lifting guide wheels correspond one-to-one with the catwalk load-bearing cables, and the catwalk load-bearing cables slide in cooperation with the corresponding lifting guide wheels. When the lifting drive is not activated, the top of the lifting guide wheel is flush with the bottom of the limiting groove. The push-pull part includes two cable clamps that are stacked vertically and detachably connected by locking screws. The catwalk load-bearing cables are locked between the two cable clamps, and the lower cable clamp is fixedly connected to the output end of the push-pull drive.

[0014] This invention also discloses a method for adjusting the cable alignment of a suspension bridge catwalk using the aforementioned cable alignment adjustment device, which is carried out according to the following steps:

[0015] S1. Based on the construction drawings of the suspension bridge, obtain the span, tower top elevation, side span anchorage elevation, material properties and mechanical parameters of the catenary load-bearing cables, as well as the basic calculation parameters of the catenary's dead load, live load, temperature load, and wind load. Use modeling software to establish a finite element model of the main cable of the suspension bridge through the catenary theory. Extract the linear data of the main cable of the suspension bridge in the empty cable state from the model. Use this data to move the parallel vertical distance d downward as the target linear shape of the catenary load-bearing cables after the bridge is completed. d is the design spacing between the catenary load-bearing cables and the main cable. Obtain the corresponding length of the catenary load-bearing cables under this model.

[0016] S2. Based on the design drawings of the suspension bridge and the design parameters of the catwalk, establish the overall finite element model of the catwalk to obtain the shape and installation length of the catwalk and the catwalk load-bearing cable in the empty cable state, as well as the length of the catwalk load-bearing cable in the stress-free state, thus obtaining the cutting length of the catwalk load-bearing cable.

[0017] S3. Install the alignment adjustment device for the catwalk load-bearing cable of the suspension bridge on the completed suspension bridge, that is, install the tower top cable adjustment mechanism at the top of the tower and the side span cable adjustment mechanism at the side span anchorages at both ends of the suspension bridge.

[0018] S4. Complete the initial installation of the catwalk load-bearing cables;

[0019] S5. Use point cloud forming technology to obtain the actual shape of the catwalk load-bearing cable and the actual mid-span length Lr of the catwalk load-bearing cable. 中 The actual length Lr of the two side spans of the catwalk load-bearing cable 边1 and Lr 边2 The design alignment of the catwalk load-bearing cable and the design length Ls of the mid-span of the catwalk load-bearing cable are calculated using a finite metadata model. 中 The design length Ls of the two side spans of the catwalk load-bearing cable 边1 and Ls 边2 ;

[0020] S6. Determine the mid-span adjustment cable length △ of the catwalk load-bearing cable according to the following formula. 中 and the lengths of the two side spans of the cable adjustment △ 边1 and △ 边2 △ 中 =Ls 中 -Lr 中 , △ 边1 =Ls 边1 -Lr 边1 +△ 中1 , △ 边2 =Ls 边2 -Lr 边2+ +△ 中2 , △ 中 =△ 中1 +△ 中2 , △ 中1 and △ 中2 These are the mid-span cable adjustment lengths of the cable adjustment mechanisms at the top of the two towers. After calculating and obtaining the cable adjustment lengths, the main control box sends mid-span cable adjustment commands to the tower top cable adjustment mechanisms and side-span cable adjustment commands to the side-span cable adjustment mechanisms.

[0021] S7. After receiving the mid-span cable adjustment command, the tower top cable adjustment mechanism controls the lifting drive to drive the lifting part to rise vertically and lift the catwalk load-bearing cable. After receiving the side-span cable adjustment command, the side-span cable adjustment mechanism controls the jacking drive to drive the catwalk load-bearing cable to extend and retract in the extension direction of the catwalk load-bearing cable.

[0022] In this step, the adjustment methods for the catwalk load-bearing cables include adjusting a single catwalk load-bearing cable and adjusting the entire catwalk load-bearing cable.

[0023] When adjusting the load-bearing cable of a single catwalk, follow these steps:

[0024] S71. The limit lock of the cable adjustment mechanism at the top of the tower is used to lock only the catwalk load-bearing cable that needs to be adjusted, and the rest of the catwalk load-bearing cables are released.

[0025] S72. The cable adjustment mechanisms at the top of the two towers move their respective push-pull drives towards the side span or the middle span, adjusting the alignment of the middle span section of the catwalk support cable by tightening or loosening the latter. The moving distance is Δ. 中1 or △ 中2 Then lock the limit lock.

[0026] S73. The side span cable adjustment mechanisms on the two side span anchorages drive the catwalk load-bearing cables to move towards the side span or the middle span direction through their respective jacking drive components. The linear adjustment of the side span section of the catwalk load-bearing cables is achieved by tightening or loosening the side span section, with a moving distance of Δ. 边1 or △ 边2 ;

[0027] When adjusting the load-bearing cables of the entire catwalk, follow these steps:

[0028] S74. Lock all the catwalk load-bearing cables by using the cable clamps in the push-pull section of the tower top cable adjustment mechanism. The lifting drive unit drives the lifting section to rise, raising the catwalk load-bearing cables to slightly above the top surface of the cable saddle. The push-pull drive unit drives the push-pull section to move horizontally, causing the catwalk load-bearing cables to move horizontally by △. 中 Then the lifting drive unit drives the lifting part to descend back to its original position, and the limit lock locks lock all the catwalk load-bearing cables to fix the position of the catwalk load-bearing cables.

[0029] S75. The catenary load-bearing cable is moved towards the side span or the middle span by the jacking drive component in the two side span cable adjustment mechanisms, and the moving distance is △. 边1 or △ 边2 ;

[0030] S8. After the cable adjustment is completed, the actual shape and measured length of the catwalk load-bearing cable after adjustment are obtained using the point cloud forming technology in step S5, and used as the measured data for subsequent cable adjustment work.

[0031] S9. After obtaining the actual alignment and measured length of the catwalk load-bearing cable after adjustment, check the sag of the catwalk load-bearing cable and determine whether the measured mid-span sag of the adjusted catwalk load-bearing cable meets the design requirements. If the measured alignment of the catwalk load-bearing cable does not meet the design requirements, repeat steps S5 to S8 above using the measured data of the catwalk load-bearing cable after adjustment in step S7 as parameters. If the measured alignment of the catwalk load-bearing cable meets the design requirements, the alignment adjustment of the catwalk load-bearing cable is completed.

[0032] The beneficial effects of this invention are:

[0033] 1. This invention uses a side-span cable adjustment mechanism and a tower-top cable adjustment mechanism to adjust the anchorage end and mid-span of the catwalk load-bearing cable, respectively. The side-span and tower-top cable adjustment mechanisms determine the adjustment data by comparing the model data and measured data of the catwalk load-bearing cable. By tightening or loosening the catwalk load-bearing cable, the alignment of the catwalk load-bearing cable is changed, realizing automatic adjustment of the alignment of the catwalk load-bearing cable. This effectively improves the accuracy of the cable adjustment work, reduces labor costs, and increases the efficiency of the cable adjustment work. It ensures that the alignment of the catwalk and the main cable remains consistent throughout the entire process from initial installation to construction, and that the distance between the catwalk and the main cable meets the construction operation requirements, effectively improving the safety and convenience of suspension bridge construction.

[0034] 2. This invention uses point cloud forming technology to measure and obtain the linear position coordinates and length of the catwalk load-bearing cable after installation. The empty cable alignment of the catwalk load-bearing cable is simulated and compared using a finite element model, and the cable adjustment data is calculated and analyzed. This realizes digital automatic control of the entire construction process of the catwalk alignment of the suspension bridge. Compared with the manual cable adjustment method in the prior art, it greatly improves the efficiency of obtaining cable adjustment parameters and can more accurately determine the cable adjustment data of the mid-span and side-span parts of the catwalk load-bearing cable.

[0035] 3. The tower top cable adjustment mechanism used in this invention uses a lifting part with a lifting guide wheel to lift the catwalk load-bearing cable for cable adjustment. The catwalk load-bearing cable and the lifting guide wheel form a sliding fit, which reduces the frictional resistance during the cable adjustment process, increases the cable adjustment speed, and solves the problem of uneven tension during the cable adjustment process, which can easily lead to damage to the catwalk load-bearing cable.

[0036] 4. The tower top cable adjustment mechanism adopted in this invention can not only adjust the overall alignment of all catwalk load-bearing cables used in the suspension bridge, but also adjust individual catwalk load-bearing cables. The adjustment of a single catwalk load-bearing cable can be carried out independently, and the alignment of other catwalk load-bearing cables will not be affected when adjusting a single catwalk load-bearing cable, thereby further improving the accuracy of the catwalk load-bearing cable alignment adjustment. The tower top cable adjustment mechanism and the side span cable adjustment mechanism adopted in this invention are detachable and reusable, with wide applicability and strong economy. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the catwalk support cable of the suspension bridge in this invention;

[0038] Figure 2 This is a schematic diagram of the top cable adjustment mechanism in this invention;

[0039] Figure 3 A schematic diagram of the cooperation structure between the lifting drive component and the lifting part in the top cable adjustment mechanism;

[0040] Figure 4 This is a schematic diagram of the side span cable adjustment mechanism in this invention;

[0041] Figure 5 This is a flowchart of the method for adjusting the alignment of the catenary support cables of a suspension bridge in this invention.

[0042] The markings in the diagram are as follows: 100-Catway load-bearing cable, 200-Tower, 300-Side span anchorage, 400-Side span cable adjustment mechanism, 410-Connecting rod, 420-Pushing drive component, 430-Anchoring lug plate, 440-Connecting plate, 500-Tower top cable adjustment mechanism, 510-Cable saddle, 511-Limiting groove, 512-Installation groove, 520-Pushing part, 521-Pushing guide wheel, 530-Push-pull part, 531-Cable clamp plate, 540-Limiting lock, 541-Fixing part, 542-Locking part, 550-Pushing drive component, 560-Push-pull drive component, 570-Connecting slide rod. Detailed Implementation

[0043] To facilitate understanding of the present invention, the invention will be further described below with reference to the accompanying drawings.

[0044] In the description of this invention, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", 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 description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0045] like Figure 1 As shown, the catwalk load-bearing cable 100 of the suspension bridge is anchored at both ends by two sets of side span anchorages 300 and supported by two pylons 200. The two pylons 200 are located between the two sets of side span anchorages 300, giving the catwalk load-bearing cable 100 a three-section cable structure consisting of the mid-span and two side spans. After installation, the catwalk load-bearing cable 100's alignment is affected by various factors, which may cause a deviation between its actual alignment and the design alignment. In this case, it is necessary to adjust the alignment of the catwalk load-bearing cable 100 to meet the design alignment requirements. This invention adjusts the alignment of the catwalk load-bearing cable 100 using an alignment adjustment device consisting of a side span cable adjustment mechanism 400, a tower top cable adjustment mechanism 500, and a main control box. The main control box serves as the installation component of the control system, and its control system is electrically connected to the side span cable adjustment mechanism 400 and the tower top cable adjustment mechanism 500. The main control box issues working instructions to the side span cable adjustment mechanism 400 and the tower top cable adjustment mechanism 500.

[0046] Specifically, such as Figure 1 and Figure 4As shown, the side span cable adjustment mechanism 400 of the present invention includes a connecting rod 410 and a jacking drive 420. One end of the connecting rod 410 is fixedly connected to the side span anchor 300, and the other end of the connecting rod 410 is fixedly connected to the jacking drive 420. The output end of the jacking drive 420 is connected to the catwalk load-bearing cable 100. The anchoring end of the catwalk load-bearing cable 100 is tightened by the jacking drive 420. When the jacking drive 420 is working, it can drive the catwalk load-bearing cable 100 to extend and retract in the extension direction of the connecting rod 410 to achieve tightening or loosening of the catwalk load-bearing cable 100.

[0047] To facilitate the assembly and connection between the connecting rod 410 and the side span anchorage 300, and between the jacking drive component 420 and the catwalk load-bearing cable 100, this invention adds anchoring lugs 430 and connecting plates 440 as relay components. For example... Figure 4 As shown, one end of the anchoring lug 430 is anchored in the side span anchorage 300, and the other end of the anchoring lug 430 is connected to the connecting rod 410 through the connecting plate 440. The anchoring lug 430 can be pre-embedded in the side span anchorage 300 during the construction stage, and the anchoring lug 430 and the connecting plate 440 are detachably connected by fasteners. The connecting rod 410 is fixedly connected to the connecting plate 440. The output end of the jacking drive component 420 is also detachably connected to the catwalk load-bearing cable 100 through the assembly structure composed of the connecting plate 440 and fasteners. When the jacking drive component 420 is working, it can perform a reciprocating jacking motion along the length direction of the connecting rod 410.

[0048] Specifically, such as Figure 1 and Figure 2As shown, the tower top cable adjustment mechanism 500 of this invention includes at least two cable saddles 510. The cable saddles 510 are fixed to the top of the tower 200 and spaced apart along the length of the catwalk support cable 100. The cable saddles 510 support the catwalk support cable 100, and their top surfaces are arc-shaped to allow the catwalk support cable 100 to transition smoothly at the cable saddles 510. This invention provides a lifting section 520 on the cable saddles 510, which can rise and fall vertically. The cable saddles 510 are provided with mounting grooves 512 to accommodate the lifting section 520. When the lifting section 520 is not raised, it is hidden within the mounting grooves 512, and at this time, the top of the lifting section 520 does not exceed the top of the cable saddle 510. When the lifting section 520 rises, it can lift the catwalk support cable 100 upwards, thereby tightening the catwalk support cable 100. A movable push-pull section 530 is also provided between the two saddles 510. The push-pull section 530 is fixedly connected to the part of the catwalk load-bearing cable 100 located between the two saddles 510. When the push-pull section 530 moves, it drives the part connected to the catwalk load-bearing cable 100 to move together, thereby pushing and pulling the catwalk load-bearing cable 100 along its length to tighten or loosen the catwalk load-bearing cable 100, thus adjusting the alignment of the catwalk load-bearing cable 100. For example, if the push-pull section 530 moves towards the middle span of the catwalk load-bearing cable 100, the side span part of the catwalk load-bearing cable 100 will be tightened and the middle span part will be loosened.

[0049] To ensure that the catwalk load-bearing cable 100 maintains its adjusted alignment after alignment adjustments and to prevent it from retracting after adjustment, it needs to be secured. This invention incorporates a limiting lock 540 that secures the catwalk load-bearing cable 100 through a locking mechanism. Figure 2 As shown, a limit lock 540 is provided on each of the two cable saddles 510, and the limit lock 540 is fixed to the opposite surfaces of the two cable saddles 510. The limit lock 540 consists of a fixing part 541, a locking part 542, and a locking screw. The fixing part 541 is fixedly installed on the corresponding cable saddle 510, and the locking part 542 is detachably connected to the fixing part 541 by the locking screw. Multiple catwalk load-bearing cables 100 pass side by side between the fixing part 541 and the locking part 542, and are secured by a lock. The tightening screws press the catwalk load-bearing cable 100 between the fixing part 541 and the locking part 542. By adjusting the tightening screws, the degree of tightening between the locking part 542 and the fixing part 541 can be changed, thereby achieving the tightening or loosening of the catwalk load-bearing cable 100. The number of tightening screws can be set to multiple, with corresponding tightening screws set on both sides of each catwalk load-bearing cable 100. Then, the tightening or loosening of a single catwalk load-bearing cable 100 can be achieved by adjusting the corresponding tightening screws.

[0050] Furthermore, in order to ensure that the catwalk load-bearing cables 100 do not shift during the adjustment process and to maintain a uniformly spaced arrangement, the present invention provides a limiting groove 511 corresponding to each catwalk load-bearing cable 100 on the top of the saddle 510. The limiting grooves 511 are evenly spaced along the length of the catwalk load-bearing cables 100, and the width of the limiting grooves 511 is adapted to the outer diameter of the catwalk load-bearing cables 100. The catwalk load-bearing cables 100 pass through the corresponding limiting grooves 511. The bottom of the limiting grooves 511 is set as an arc surface adapted to the top surface of the saddle 510 to achieve an arc transition of the catwalk load-bearing cables 100.

[0051] The lifting and lowering action of the lifting unit 520 is achieved by the lifting drive component 550, such as... Figure 2 and Figure 3 As shown, the lifting drive 550 is fixed in the mounting groove 512 of the cable saddle 510. The output end of the lifting drive 550 is connected to the lifting part 520 to drive the lifting part 520 to move up and down in the vertical direction. When the lifting drive 550 is not activated, the top of the lifting part 520 is flush with the bottom of the limiting groove 511. The translational movement of the push-pull part 530 is achieved by the push-pull drive 560, as shown in the figure. Figure 2 As shown, a connecting slide rod 570 parallel to the length direction of the catwalk load-bearing cable 100 is fixedly connected between the two cable saddles 510. A push-pull drive component 560 is slidably mounted on the connecting slide rod 570, and the output end of the push-pull drive component 560 is connected to the push-pull part 530. Alternatively, a slidable sleeve can be fitted onto the connecting slide rod 570, connecting the output end of the push-pull drive component 560 to the sleeve and the sleeve to the push-pull part 530. The push-pull drive component 560 drives the sleeve to slide on the connecting slide rod 570, thereby causing the push-pull part 530 connected to the sleeve to translate. The jacking drive component 420, the lifting drive component 550, and the push-pull drive component 560 in this invention can be hydraulic cylinders, pneumatic cylinders, or jacks, with a jack having a self-locking function being the preferred option. The self-locking function of the jack prevents the catwalk load-bearing cable 100 from retracting.

[0052] Furthermore, such as Figure 2 As shown, the push-pull part 530 consists of two cable clamps 531 that are stacked vertically and detachably connected by locking screws. The catwalk load-bearing cable 100 passes through the two cable clamps 531 side by side, and the connection effect of the locking screws is used to press the catwalk load-bearing cable 100 between the two cable clamps 531.

[0053] To reduce the friction between the catwalk load-bearing cable 100 and the saddle cable 510, such as Figure 3As shown, the present invention provides a plurality of rotatable lifting guide wheels 521 on the lifting section 520, each corresponding to a catwalk support cable 100. The lifting guide wheels 521 are connected to the cable saddle 510 via rotating shafts. When the lifting section 520 is not in the raised state, the top of the catwalk support cable 100 is in contact with the top of the lifting guide wheels 521. When the lifting section 520 rises to lift and adjust the catwalk support cable 100, the catwalk support cable 100 rolls on the lifting guide wheels 521, thereby significantly reducing the friction experienced by the catwalk support cable 100 during movement. This effectively reduces the power requirement for cable adjustment, improves adjustment efficiency, and reduces wear on the catwalk support cable 100.

[0054] This invention also discloses a method for adjusting the alignment of the catwalk load-bearing cables of a suspension bridge using the aforementioned alignment adjustment device, such as... Figure 5 As shown, the method for adjusting the line shape is as follows:

[0055] S1. Based on the construction drawings of the suspension bridge, obtain the span, tower top elevation, side span anchorage elevation, material properties and mechanical parameters of the catenary load-bearing cables, as well as the basic calculation parameters of the catenary's dead load, live load, temperature load, and wind load. Use modeling software to establish a finite element model of the main cable of the suspension bridge through the catenary theory. Extract the alignment data of the main cable of the suspension bridge in the empty cable state from the model. Use this data to move the parallel vertical distance d downward as the target alignment of the catenary load-bearing cables after the bridge is completed. d is the design spacing between the catenary load-bearing cables and the main cable. The value of this design spacing is generally in the range of 1.5 to 1.7m. Obtain the corresponding length of the catenary load-bearing cables under this model.

[0056] S2. Based on the design drawings of the suspension bridge and the design parameters of the catwalk, establish the overall finite element model of the catwalk to obtain the shape and installation length of the catwalk and the catwalk load-bearing cable in the empty cable state, as well as the length of the catwalk load-bearing cable in the stress-free state, thus obtaining the cutting length of the catwalk load-bearing cable.

[0057] S3. Install the alignment adjustment device for the catwalk load-bearing cable of the suspension bridge on the completed suspension bridge, that is, install the tower top cable adjustment mechanism at the top of the tower and the side span cable adjustment mechanism at the side span anchorages at both ends of the suspension bridge.

[0058] S4. Complete the initial installation of the catwalk load-bearing cables;

[0059] S5. Use point cloud forming technology to obtain the actual shape of the catwalk load-bearing cable and the actual mid-span length Lr of the catwalk load-bearing cable. 中 The actual length Lr of the two side spans of the catwalk load-bearing cable 边1 and Lr 边2 The design alignment of the catwalk load-bearing cable and the design length Ls of the mid-span of the catwalk load-bearing cable are calculated using a finite metadata model. 中The design length Ls of the two side spans of the catwalk load-bearing cable 边1 and Ls 边2 ;

[0060] S6. Determine the mid-span adjustment cable length △ of the catwalk load-bearing cable according to the following formula. 中 and the lengths of the two side spans of the cable adjustment △ 边1 and △ 边2 △ 中 =Ls 中 -Lr 中 , △ 边1 =Ls 边1 -Lr 边1 +△ 中1 , △ 边2 =Ls 边2 -Lr 边2+ +△ 中2 , △ 中 =△ 中1 +△ 中2 , △ 中1 and △ 中2 These are the mid-span cable adjustment lengths of the cable adjustment mechanisms at the top of the two towers. After calculating and obtaining the cable adjustment lengths, the main control box sends mid-span cable adjustment commands to the tower top cable adjustment mechanisms and side-span cable adjustment commands to the side-span cable adjustment mechanisms.

[0061] S7. After receiving the mid-span cable adjustment command, the tower top cable adjustment mechanism controls the lifting drive to drive the lifting part to rise vertically and lift the catwalk load-bearing cable. After receiving the side-span cable adjustment command, the side-span cable adjustment mechanism controls the jacking drive to drive the catwalk load-bearing cable to extend and retract in the extension direction of the catwalk load-bearing cable.

[0062] In this step, the adjustment methods for the catwalk load-bearing cables include adjusting a single catwalk load-bearing cable and adjusting the entire catwalk load-bearing cable.

[0063] When adjusting the load-bearing cable of a single catwalk, follow these steps:

[0064] S71. The limit lock of the cable adjustment mechanism at the top of the tower is used to lock only the catwalk load-bearing cable that needs to be adjusted, and the rest of the catwalk load-bearing cables are released.

[0065] S72. The cable adjustment mechanisms at the top of the two towers move their respective push-pull drives towards the side span or the middle span, adjusting the alignment of the middle span section of the catwalk support cable by tightening or loosening the latter. The moving distance is Δ. 中1 or △ 中2 Then lock the limit lock.

[0066] S73. The side span cable adjustment mechanisms on the two side span anchorages drive the catwalk load-bearing cables to move towards the side span or the middle span direction through their respective jacking drive components. The linear adjustment of the side span section of the catwalk load-bearing cables is achieved by tightening or loosening the side span section, with a moving distance of Δ. 边1 or △ 边2 ;

[0067] When adjusting the load-bearing cables of the entire catwalk, follow these steps:

[0068] S74. Lock all the catwalk load-bearing cables by using the cable clamps in the push-pull section of the tower top cable adjustment mechanism. The lifting drive unit drives the lifting section to rise, raising the catwalk load-bearing cables to slightly above the top surface of the cable saddle. The push-pull drive unit drives the push-pull section to move horizontally, causing the catwalk load-bearing cables to move horizontally by △. 中 Then the lifting drive unit drives the lifting part to descend back to its original position, and the limit lock locks lock all the catwalk load-bearing cables to fix the position of the catwalk load-bearing cables.

[0069] S75. The catenary load-bearing cable is moved towards the side span or the middle span by the jacking drive component in the two side span cable adjustment mechanisms, and the moving distance is △. 边1 or △ 边2 ;

[0070] S8. After the cable adjustment is completed, the actual shape and measured length of the catwalk load-bearing cable after adjustment are obtained using the point cloud forming technology in step S5, and used as the measured data for subsequent cable adjustment work.

[0071] S9. After obtaining the actual alignment and measured length of the catwalk load-bearing cable after adjustment, check the sag of the catwalk load-bearing cable and determine whether the measured mid-span sag of the adjusted catwalk load-bearing cable meets the design requirements. If the measured alignment of the catwalk load-bearing cable does not meet the design requirements, repeat steps S5 to S8 above using the measured data of the catwalk load-bearing cable after adjustment in step S7 as parameters. If the measured alignment of the catwalk load-bearing cable meets the design requirements, the alignment adjustment of the catwalk load-bearing cable is completed.

Claims

1. A linear adjustment device for the catwalk support cables of a suspension bridge, the suspension bridge comprising catwalk support cables (100), towers (200), and side span anchorages (300), wherein multiple catwalk support cables (100) are parallel and suspended between two sets of side span anchorages (300), the two ends of the catwalk support cables (100) are fixedly connected to the two sets of side span anchorages (300) respectively, and two towers (200) are located between the two sets of side span anchorages (300) and support the catwalk support cables (100), characterized in that: It also includes a side span cable adjustment mechanism (400) installed on the side span anchorage (300), a tower top cable adjustment mechanism (500) installed on the tower (200), and a main control box electrically connected to the side span cable adjustment mechanism (400) and the tower top cable adjustment mechanism (500); The side span cable adjustment mechanism (400) includes a connecting rod (410) and a jacking drive (420). The connecting rod (410) is fixed on the side span anchor (300), and the jacking drive (420) is fixed on the connecting rod (410). The output end of the jacking drive (420) is connected to the catwalk load-bearing cable (100). The jacking drive (420) can drive the catwalk load-bearing cable (100) to extend and retract in the extension direction of the connecting rod (410). The tower top cable adjustment mechanism (500) includes at least two cable saddles (510) fixed to the top of the tower (200) and spaced apart along the extension direction of the catwalk load-bearing cable (100). The cable saddles (510) support the catwalk load-bearing cable (100). The cable saddles (510) are provided with liftable lifting parts (520). The lifting parts (520) can rise to vertically lift the catwalk load-bearing cable (100). There are translatable push-pull parts (530) between adjacent cable saddles (510). The push-pull parts (530) can translate to push and pull the catwalk load-bearing cable (100) along the length direction of the catwalk load-bearing cable (100). The top surface of the cable saddle (510) is an arc surface. The top of the cable saddle (510) is provided with limiting grooves (511) corresponding to the catwalk load-bearing cables (100). The limiting grooves (511) are evenly distributed along the length direction of the catwalk load-bearing cables (100), and the catwalk load-bearing cables (100) pass through the corresponding limiting grooves (511). The cable saddle (510) is also provided with mounting grooves (512), and a lifting drive component (550) is fixed in the mounting groove (512) for lifting. The output end of the drive unit (550) is connected to the lifting part (520). When the lifting drive unit (550) is not activated, the top of the lifting part (520) is flush with the bottom of the limiting groove (511). It also includes a push-pull drive unit (560). A connecting slide rod (570) is fixed between adjacent rotating cable saddles (510). The push-pull drive unit (560) is slidably mounted on the connecting slide rod (570) and the output end of the push-pull drive unit (560) is connected to the push-pull part (530). The lifting part (520) is provided with multiple rotatable lifting guide wheels (521). The circumferential surface of the lifting guide wheel (521) is provided with a radially concave sliding groove. The lifting guide wheel (521) corresponds one-to-one with the catwalk load-bearing cable (100). The catwalk load-bearing cable (100) slides in cooperation with the corresponding lifting guide wheel (521). When the lifting drive (550) is not activated, the top of the lifting guide wheel (521) is flush with the bottom of the limiting groove. The push-pull part (530) includes two cable clamps (531) that are stacked vertically and detachably connected by locking screws. The catwalk load-bearing cable (100) is locked between the two cable clamps (531). The lower cable clamp (531) is fixedly connected to the output end of the push-pull drive (560).

2. The alignment adjustment device for the catenary support cable of a suspension bridge as described in claim 1, characterized in that: The side span cable adjustment mechanism (400) also includes an anchoring ear plate (430) and a connecting plate (440). The anchoring ear plate (430) is anchored on the side span anchor (300) and is detachably connected to the connecting rod (410) through the connecting plate (440). The connecting plate (440) is connected to the connecting rod (410). The output end of the jacking drive component (420) is detachably connected to the catwalk load-bearing cable (100) through the connecting plate (440).

3. The alignment adjustment device for the catenary support cable of a suspension bridge as described in claim 1, characterized in that: The tower top cable adjustment mechanism (500) also includes a limit lock (540) corresponding to the cable saddle (510). The limit lock (540) includes a fixing part (541) fixed on the corresponding cable saddle (510) and a locking part (542) detachably connected to the fixing part (541) by a locking screw. Multiple catwalk load-bearing cables (100) pass side by side between the fixing part (541) and the locking part (542).

4. A method for adjusting the cable alignment of the catwalk load-bearing structure of a suspension bridge, characterized in that: The alignment adjustment device for the catenary load-bearing cable of a suspension bridge as described in any one of claims 1 to 3 is used, and the following steps are performed: S1. Based on the construction drawings of the suspension bridge, obtain the span, tower top elevation, side span anchorage elevation, material properties and mechanical parameters of the catenary load-bearing cables, as well as the basic calculation parameters of the catenary's dead load, live load, temperature load, and wind load. Use modeling software to establish a finite element model of the main cable of the suspension bridge through the catenary theory. Extract the linear data of the main cable of the suspension bridge in the empty cable state from the model. Use this data to move the parallel vertical distance d downward as the target linear shape of the catenary load-bearing cables after the bridge is completed. d is the design spacing between the catenary load-bearing cables and the main cable. Obtain the corresponding length of the catenary load-bearing cables under this model. S2. Based on the design drawings of the suspension bridge and the design parameters of the catwalk, establish the overall finite element model of the catwalk to obtain the shape and installation length of the catwalk and the catwalk load-bearing cable in the empty cable state, as well as the length of the catwalk load-bearing cable in the stress-free state, thus obtaining the cutting length of the catwalk load-bearing cable. S3. Install the alignment adjustment device for the catwalk load-bearing cable of the suspension bridge on the completed suspension bridge, that is, install the tower top cable adjustment mechanism at the top of the tower and the side span cable adjustment mechanism at the side span anchorages at both ends of the suspension bridge. S4. Complete the initial installation of the catwalk load-bearing cables; S5. Use point cloud forming technology to obtain the actual shape of the catwalk load-bearing cable and the actual mid-span length Lr of the catwalk load-bearing cable. 中 The actual length Lr of the two side spans of the catwalk load-bearing cable 边1 and Lr 边2 The design alignment of the catwalk load-bearing cable and the design length Ls of the mid-span of the catwalk load-bearing cable are calculated using a finite metadata model. 中 The design length Ls of the two side spans of the catwalk load-bearing cable 边1 and Ls 边2 ; S6. Determine the mid-span adjustment cable length △ of the catwalk load-bearing cable according to the following formula. 中 and the lengths of the two side spans of the cable adjustment △ 边1 and △ 边2 △ 中 =Ls 中 -Lr 中 , △ 边1 =Ls 边1 -Lr 边1 +△ 中1 , △ 边2 =Ls 边2 -Lr 边2+ +△ 中2 , △ 中 =△ 中1 +△ 中2 , △ 中1 and △ 中2 These are the mid-span cable adjustment lengths of the cable adjustment mechanisms at the top of the two towers. After calculating and obtaining the cable adjustment lengths, the main control box sends mid-span cable adjustment commands to the tower top cable adjustment mechanisms and side-span cable adjustment commands to the side-span cable adjustment mechanisms. S7. After receiving the mid-span cable adjustment command, the tower top cable adjustment mechanism controls the lifting drive to drive the lifting part to rise vertically and lift the catwalk load-bearing cable. After receiving the side-span cable adjustment command, the side-span cable adjustment mechanism controls the jacking drive to drive the catwalk load-bearing cable to extend and retract in the extension direction of the catwalk load-bearing cable. In this step, the adjustment methods for the catwalk load-bearing cables include adjusting a single catwalk load-bearing cable and adjusting the entire catwalk load-bearing cable. When adjusting the load-bearing cable of a single catwalk, follow these steps: S71. The limit lock of the cable adjustment mechanism at the top of the tower is used to lock only the catwalk load-bearing cable that needs to be adjusted, and the rest of the catwalk load-bearing cables are released. S72. The cable adjustment mechanisms at the top of the two towers move their respective push-pull drives towards the side span or the middle span, adjusting the alignment of the middle span section of the catwalk support cable by tightening or loosening the latter. The moving distance is Δ. 中1 or △ 中2 Then lock the limit lock. S73. The side span cable adjustment mechanisms on the two side span anchorages drive the catwalk load-bearing cables to move towards the side span or the middle span direction through their respective jacking drive components. The linear adjustment of the side span section of the catwalk load-bearing cables is achieved by tightening or loosening the side span section, with a moving distance of Δ. 边1 or △ 边2 ; When adjusting the load-bearing cables of the entire catwalk, follow these steps: S74. Lock all the catwalk load-bearing cables by using the cable clamps in the push-pull section of the tower top cable adjustment mechanism. The lifting drive unit drives the lifting section to rise, raising the catwalk load-bearing cables to slightly above the top surface of the cable saddle. The push-pull drive unit drives the push-pull section to move horizontally, causing the catwalk load-bearing cables to move horizontally by △. 中 Then the lifting drive unit drives the lifting part to descend back to its original position, and the limit lock locks lock all the catwalk load-bearing cables to fix the position of the catwalk load-bearing cables. S75. The catenary load-bearing cable is moved towards the side span or the middle span by the jacking drive component in the two side span cable adjustment mechanisms, and the moving distance is △. 边1 or △ 边2 ; S8. After the cable adjustment is completed, the actual shape and measured length of the catwalk load-bearing cable after adjustment are obtained using the point cloud forming technology in step S5, and used as the measured data for subsequent cable adjustment work. S9. After obtaining the actual alignment and measured length of the catwalk load-bearing cable after adjustment, check the sag of the catwalk load-bearing cable and determine whether the measured mid-span sag of the adjusted catwalk load-bearing cable meets the design requirements. If the measured alignment of the catwalk load-bearing cable does not meet the design requirements, repeat steps S5 to S8 above using the measured data of the catwalk load-bearing cable after adjustment in step S7 as parameters. If the measured alignment of the catwalk load-bearing cable meets the design requirements, the alignment adjustment of the catwalk load-bearing cable is completed.

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