Continuous catwalk linear fine adjustment method

Abstract

The invention discloses a continuous catwalk line shape fine adjustment method, which comprises the following steps of: temporarily fixing a catwalk with a first main tower and a second main tower after the catwalk is erected, measuring the line shape of the catwalk and the deviation of the main towers through a measuring device, and carrying out catwalk line shape adjustment calculation analysis after the measured data is sorted; adjusting the small stake number side span bearing cable by using the adjusting system, adjusting the middle span bearing cable by using the first counter-pull system, adjusting the large stake number side span bearing cable by using the second counter-pull system, and repeatedly adjusting the side span and the middle span until the catwalk line shape reaches the designed line shape. And the deviation of the tops of the first main tower and the second main tower is not more than 1cm. According to the method, the catwalk line shape and the tower column deviation can be accurately adjusted, the final deviation error of a main tower after a bridge is formed is reduced, the construction efficiency and safety are improved, meanwhile, the construction quality is guaranteed, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering construction, and more specifically, relates to a method for precisely adjusting the alignment of a continuous catwalk. Background Art

[0002] The catwalk is an important temporary facility in the construction of the upper structure of a suspension bridge, consisting of load-bearing cables, handrails, rigid hangers, deck panels, wire meshes, etc., and its structural form needs to meet the requirements of strength and stiffness. It mainly provides a platform for construction operations such as main cable traction, adjustment, tightening, protection, installation of cable clamps and suspension ropes, serves as a transportation passage for construction personnel and equipment, runs through the entire construction process of the upper structure of the suspension bridge, provides a safe passage and operating platform for construction personnel, and is equipped with handrails and railings to prevent personnel from falling.

[0003] The erection accuracy of the catwalk directly affects the construction quality and final state of the suspension bridge. Its surface alignment should be parallel to the no-load alignment of the main cable and maintain a certain distance (usually about 1.5 meters) to meet the operating space requirements of construction personnel during the erection of the main cable.

[0004] The accuracy of the catwalk alignment directly affects the construction accuracy of the main cable. If the catwalk alignment is inaccurate, it may lead to deviations during the traction, adjustment, and installation of the main cable, affecting the alignment and stress state of the main cable. For example, the main cable strands may twist, bulge, or loosen, thereby affecting the stress performance of the main cable after the bridge is completed; the catwalk is an important high-altitude operating platform during the construction of the suspension bridge, and its alignment deviation may cause discomfort for construction personnel when walking or working on the catwalk, and may even lead to safety accidents such as falls from heights; in addition, inaccurate alignment may result in insufficient wind resistance of the catwalk, making it prone to vibration or displacement in strong wind weather, further endangering construction safety; inaccurate catwalk alignment will cause construction personnel to frequently adjust equipment or construction positions during the operation process, increasing the construction difficulty and time cost, and reducing construction efficiency; catwalk alignment deviation may cause uneven stress on the main tower and anchor structure, increasing the additional stress of the structure; in addition, the relative position between the catwalk and the main cable is inaccurate, which may affect the installation accuracy of the main cable, and thus have an adverse impact on the structural performance of the entire bridge; inaccurate catwalk alignment may cause construction personnel to feel significant vibration or instability when walking or working, affecting the comfort of construction personnel. For example, when the vertical acceleration response of the catwalk exceeds 1 m / s 2 ², construction personnel will feel obvious discomfort; inaccurate catwalk alignment may cause subsequent construction steps (such as installation of cable clamps and suspension ropes, hoisting of steel box girders, etc.) to not proceed smoothly; for example, the relative position deviation between the catwalk and the main cable may affect the installation accuracy of the suspension ropes. Summary of the Invention

[0005] In view of the above deficiencies or improvement requirements of the prior art, the present invention provides a method for precisely adjusting the alignment of a continuous catwalk. By setting an adjustment system on the anchor block, the alignment of the side span with a small mileage and the deviation of the top of the first main tower are adjusted. By setting a first anti-pulling system and a second anti-pulling system on the tops of the first main tower and the second main tower, the alignment of the middle span and the side span with a large mileage, as well as the deviation of the top of the second main tower, are adjusted to ensure that the alignment of the catwalk and the deviation of the main tower meet the design requirements, avoid excessive deviation of the main tower due to uneven stress, and reduce the final deviation error of the main tower after the completion of the bridge. By controlling the contraction amount of the load-bearing cable adjusted each time, the alignment of the catwalk is gradually made to reach the design alignment. After each cycle of adjustment is completed, the alignment of the catwalk and the deviation of the tower column are measured in a timely manner, ensuring the structural safety of the main tower, and being able to avoid too rapid change in the sag of the load-bearing cable of the catwalk, making it difficult to control the adjustment accuracy of the catwalk, resulting in difficulty in reaching the design requirements even after multiple adjustments, which will not only increase the construction time and cost, but also affect the progress of the entire bridge construction.

[0006] To achieve the above object, according to the present invention, a method for precisely adjusting the alignment of a continuous catwalk is provided, including the following steps:

[0007] S100: After the catwalk is erected and temporarily fixed to the first main tower and the second main tower, the alignment of the catwalk and the deviations of the first main tower and the second main tower are measured by a measuring device, and after the measurement data is sorted out, calculation and analysis of the catwalk alignment adjustment are carried out;

[0008] S200: The adjustment system is set on the anchor block of the catwalk, the temporary fixation of the load-bearing cable on the side span of the first main tower is released, and the load-bearing cable on the side span with a small mileage is adjusted by the adjustment system, so that the load-bearing cable on the side span with a small mileage moves towards the anchor block to adjust the alignment of the catwalk and the deviation of the top of the first main tower;

[0009] S300: After the alignment adjustment of the catwalk on the side span with a small mileage is completed, the temporary fixation on the middle span side of the first main tower is released, and the middle span load-bearing cable is adjusted by the first anti-pulling system, so that the middle span load-bearing cable moves towards the side span with a small mileage to adjust the alignment of the catwalk and the deviation of the top of the first main tower;

[0010] S400: Steps S200 and S300 are repeated until the alignments of the catwalks on the side spans with small and middle mileages reach the design alignments and the deviation of the top of the first main tower is not greater than 1 cm, and then the temporary fixation of the load-bearing cable to the first main tower is restored;

[0011] S500: The alignment of the catwalk on the side span with a large mileage and the deviation of the top of the second main tower are measured. If the deviation of the second main tower is not greater than 1 cm, there is no need to adjust the alignment of the catwalk and the deviation of the top of the second main tower. If the deviation of the second main tower is greater than 1 cm, it is necessary to adjust the alignment of the catwalk and the deviation of the top of the second main tower;

[0012] S600: After all catwalk alignments are adjusted, re-measure the top offsets of the first and second main towers and the alignment of the catwalks to determine whether repeated adjustments are required.

[0013] Furthermore, the adjustment system includes multiple anchor seats, through holes are provided on both sides of the anchor seats, anchor heads are fixedly installed on the ends of the load-bearing cables, the anchor heads are rotatably connected to the anchor seats, and reaction beams are provided on the ends of the anchor heads. The reaction beams, anchor seats and anchors are connected by fine-rolled threaded steel bars, one end of which is fixedly installed on the anchor, and the other end is connected to the jack, and the load-bearing cables are driven by tensioning or relaxing the fine-rolled threaded steel bars through the jack.

[0014] Furthermore, the first counter-pull system includes a first main tower gantry arranged at the top of the first main tower, and a first winch and a second winch are provided on the top of the first main tower gantry. The first winch and the second winch are fixedly connected to the load-bearing cable through a first pulley group.

[0015] Furthermore, the second counter-pull system includes a first main tower gantry arranged at the top of the first main tower, and the first main tower gantry is provided with a third winch and a fourth winch, and the third winch and the fourth winch are fixedly connected to the load-bearing cable through a second pulley group.

[0016] Furthermore, step S500 specifically includes the following steps:

[0017] S510: If the deviation of the second main tower top is no more than 1 cm, the alignment of the large pile side span catwalk and the deviation of the second main tower top will not be adjusted. If the deviation of the second main tower top is more than 1 cm, the temporary fixation of the second main tower top mid-span side will be released. After a certain period of time, the deformation of the load-bearing cables will be completed, and then the temporary fixation of the second main tower top mid-span side will be restored.

[0018] S520: The temporary fixation on the side span of the second main tower top is released, and after a certain period of time, the deformation of the load-bearing cables is completed, the deflection of the second main tower top is measured to see whether it has recovered.

[0019] S530: If the deviation of the top of the second main tower has not been restored, and the temporary fixations on both sides of the top of the second main tower are contacted, the large pile side span load-bearing cables are adjusted through the second counter-tension system until the deviation of the top of the second main tower meets the requirements, and then the temporary fixations on both sides of the second main tower are restored.

[0020] Furthermore, when using the adjustment system to tension the load-bearing cables, pay close attention to the straight force conditions of the high-quality rolled threaded steel bars. If the high-quality rolled threaded steel bars are found to have a bending tendency, stop tensioning immediately and take appropriate measures.

[0021] Further, the first adjustment shrinkage of the side span and mid-span load-bearing cables is 5 cm, and the subsequent adjustment shrinkage for each time should be 5 - 10 cm according to the measurement of the previous adjustment shrinkage for each adjustment magnitude.

[0022] Further, when installing the first and second pulley blocks and the catwalk load-bearing cable, use a chain block to tighten each root one by one and then fix it to the load-bearing cable with a rope clamp.

[0023] Further, during the linear adjustment of the side span catwalk on the small mileage side, the states of the handrail cable, side net, and gantry support cable should be observed. If it is found that the side net and gantry are significantly skewed, adjust them in time and anchor them firmly.

[0024] Further, after each cycle of adjustment is completed, it is necessary to measure the catwalk alignment and the deviation of the top of the first main tower, and compare and analyze it with the designed catwalk alignment.

[0025] Generally speaking, compared with the prior art by the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0026] 1. The catwalk alignment fine-tuning method of the present invention uses the condition of stable night temperature for measurement, improves the measurement accuracy, improves the adjustment effect, realizes the precise adjustment of the catwalk alignment through calculation and analysis of the measured data, improves the construction efficiency and safety, ensures the construction quality at the same time, reduces the maintenance cost, and improves the structural stability.

[0027] 2. The catwalk alignment fine-tuning method of the present invention adjusts the side span alignment of the small mileage side and the deviation of the top of the first main tower by setting an adjustment system on the anchor block, and adjusts the mid-span and the side span alignment of the large mileage side, as well as the deviation of the top of the second main tower by setting a first anti-pulling system and a second anti-pulling system on the tops of the first main tower and the second main tower, ensuring that the catwalk alignment and the main tower deviation meet the design requirements, avoiding excessive deviation of the main tower due to uneven stress, and reducing the final deviation error of the main tower after the bridge is completed.

[0028] 3. The catwalk alignment fine-tuning method of the present invention gradually makes the catwalk alignment reach the designed alignment by controlling the shrinkage of the load-bearing cable for each adjustment. After each cycle of adjustment is completed, the catwalk alignment and the tower column deviation are measured in time, ensuring the structural safety of the main tower, and being able to avoid the rapid change of the sag of the catwalk load-bearing cable, making it difficult to control the adjustment accuracy of the catwalk, resulting in difficulty in meeting the design requirements even after multiple adjustments, which will not only increase the construction time and cost, but also affect the progress of the entire bridge construction.

[0029] 4. The catwalk alignment fine-tuning method of the present invention can adapt to different tower deviation situations and has strong adaptability and flexibility. Description of the Drawings

[0030] Figure 1 Schematic flow chart of a method for precisely adjusting the alignment of a continuous catwalk according to an embodiment of the present invention;

[0031] Figure 2 Schematic flow chart of step S500 in a method for precisely adjusting the alignment of a continuous catwalk according to an embodiment of the present invention;

[0032] Figure 3 Schematic structural diagram of a continuous catwalk according to an embodiment of the present invention;

[0033] Figure 4 Schematic diagram of an adjustment system for a continuous catwalk according to an embodiment of the present invention;

[0034] Figure 5 Schematic diagram of a first anti-pulling system for a continuous catwalk according to an embodiment of the present invention;

[0035] Figure 6 Schematic diagram of a second anti-pulling system for a continuous catwalk according to an embodiment of the present invention.

[0036] In all the drawings, the same reference numerals represent the same technical features, specifically: 1 - first main tower, 2 - second main tower, 3 - anchor, 4 - catwalk load-bearing cable, 5 - adjustment system, 51 - anchor seat, 52 - anchor head, 53 - precision rolled threaded steel bar, 54 - reaction beam, 55 - nut, 56 - jack, 6 - first anti-pulling system, 61 - first main tower gantry, 62 - first winch, 63 - second winch, 64 - first pulley block, 7 - second anti-pulling system, 71 - first main tower gantry, 72 - third winch, 73 - fourth winch, 74 - second pulley block. Detailed implementation manners

[0037] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present invention, these descriptions of "first", "second", etc. are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] In this patent, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, the elements defined by the statement "comprising..." do not preclude the presence of additional identical elements in the process, method, article or apparatus comprising the said elements.

[0041] Embodiment 1

[0042] As Figure 1-4 shown, an embodiment of the present invention provides a method for precisely adjusting the alignment of a continuous catwalk, comprising the following steps:

[0043] S100: After the catwalk erection is completed and temporarily fixed to the first main tower 1 and the second main tower 2, measure the alignment of the catwalk and the offsets of the first main tower 1 and the second main tower 2 using a measuring device, and perform calculation and analysis of the catwalk alignment adjustment after organizing the measurement data;

[0044] After the catwalk erection work is completed and temporarily fixed to the first main tower 1 and the second main tower 2, and ensuring the structural stability, comprehensively and carefully measure the alignment of the catwalk (i.e., its spatial position and shape) and the offsets of the tops of the first main tower 1 and the second main tower 2 (the degree of deviation from the designed position) using a high-precision measuring device.

[0045] When measuring the alignment of the catwalk and the offsets of the tops of the first main tower 1 and the second main tower 2, the offsets of the tops of the first main tower 1 and the second main tower 2 and the alignment of the catwalk should be measured under the condition of relatively stable night temperature, and the measurement time, ambient temperature and working conditions should be recorded simultaneously.

[0046] After the measurement is completed, relevant data are collected and organized. These data are the basis for evaluating the degree of compliance between the current status of the catwalk and the design requirements. Using computing software and mathematical models, these measurement data are deeply analyzed, the deviation between the catwalk alignment and the ideal state is calculated, and a plan for adjusting the catwalk alignment is formulated.

[0047] This adjustment calculation and analysis process not only includes adjustments to the catwalk's own alignment, but also involves fine-tuning the tower column offset, thereby avoiding excessive displacement of the main tower due to uneven force, and reducing the final displacement error of the main tower after the bridge is completed, to ensure the stability, safety and construction efficiency of the entire structure. Through analysis and adjustment measures, construction errors can be minimized, project quality can be improved, and a solid foundation can be laid for subsequent bridge construction or other high-altitude operations.

[0048] S200: Installing the adjustment system 5 on the anchor 3 of the catwalk, releasing the temporary fixation of the side span bearing cables 4 of the first main tower 1, and adjusting the small pile side span bearing cables 4 through the adjustment system 5 so that the small pile side span bearing cables 4 move toward the anchor 3, thereby adjusting the catwalk alignment and the offset of the top of the first main tower 1;

[0049] Before adjusting the catwalk, the entrance and exit of the catwalk should be temporarily closed, and special personnel should be arranged to be on duty, and strict safety measures should be implemented to ensure the safety of construction workers.

[0050] The anchor 3 is an important anchoring point of the catwalk's load-bearing cable 4. By arranging an adjustment system 5 on the anchor 3, the tension and position of the load-bearing cable 4 can be effectively controlled, thereby realizing the adjustment of the overall linear shape of the catwalk. The adjustment system 5 includes a plurality of anchor seats 51, and through holes are provided on both sides of the anchor seat 51. An anchor head 52 is fixedly installed at the end of the load-bearing cable 4, and the anchor head 52 is rotatably connected to the anchor seat 51. A reaction beam 54 is provided at the end of the anchor head 52. The reaction beam 54, the anchor seat 51 and the anchor 3 are connected by a high-pressure rolled threaded steel bar 53, one end of which is fixedly installed on the anchor 3, and the other end is connected to the jack 56. The high-pressure rolled threaded steel bar 53 is tensioned or relaxed by the jack 56 to drive the load-bearing cable 4 to realize precise adjustment operation. By using a jack to tension or relax the fine-rolled threaded steel bars 53, the length of the load-bearing cable 4 can be accurately adjusted. The rotational connection between the anchor head 52 and the anchor seat 51 can enable the load-bearing cable 4 to adapt to its different angles while adjusting. The reaction beam 54 can enhance the tensile strength of the anchor point and play a role of reverse support during the adjustment process.

[0051] The finished rolled threaded steel bar 53 is connected to the anchor seat 51 through a nut 55. The surface of the finished rolled threaded steel bar 53 is provided with an external thread that matches the nut 55. After the load-bearing cable 4 is tensioned, it can be fixed to the anchor seat 51 through the nut 55.

[0052] A steel backing plate is provided between the nut 55 and the anchor seat 51, and a steel backing plate is provided between the jack 56 and the reaction beam 54. The steel backing plate can effectively disperse the local stress and avoid local deformation caused by the direct action of the jack on the reaction beam.

[0053] Before the formal adjustment, it is necessary to first release the temporary fixation of the side-span load-bearing cable 4 on the side of the first main tower 1. The temporary fixation is to ensure the stability of the catwalk load-bearing cable 4 during the erection process and avoid accidental deformation or damage caused by external factors (such as wind force, construction load, etc.). After releasing the temporary fixation, the load-bearing cable 4 can move freely, providing conditions for subsequent adjustment operations.

[0054] Through the action of the adjustment system 5, the side-span load-bearing cable 4 on the small-station side is moved towards the anchor block 3, which is realized by the pushing and pulling action of the hydraulic jack. The specific operation is to control the displacement of the load-bearing cable 4 by adjusting the stroke of the jack. At the same time, the cable force sensor is used to monitor the cable force change of the load-bearing cable in real time to ensure the accuracy and safety of the adjustment process.

[0055] The alignment of the load-bearing cable 4 is adjusted through the adjustment system 5 to meet the design requirements. At the same time, by adjusting the tension and position of the load-bearing cable 4, the deviation of the first main tower 1 can be corrected, and the phenomenon that the top of the tower deviates from the designed position due to the unbalanced force on both sides of the cable can be eliminated.

[0056] S300: After the alignment adjustment of the side-span catwalk on the small-station side is completed, release the temporary fixation on the mid-span side of the first main tower 1, and adjust the mid-span load-bearing cable 4 through the first counter-pulling system 6 to make the mid-span load-bearing cable move towards the side-span on the small-station side, and adjust the catwalk alignment and the deviation of the top of the first main tower 1;

[0057] After the alignment adjustment of the side-span catwalk on the small-station side is completed, release the temporary fixation on the mid-span side of the first main tower 1. The temporary fixation is to ensure the stability of the catwalk load-bearing cable 4 during the erection process. After the alignment adjustment of the side-span catwalk is completed, these fixations need to be released to make the load-bearing cable 4 move freely for adjusting the mid-span load-bearing cable 4. After releasing the temporary fixation, the mid-span load-bearing cable 4 is adjusted through the first counter-pulling system 6.

[0058] The first counter-pulling system 6 includes a first main tower gantry 61 provided at the top of the first main tower 1. A first winch 62 and a second winch 63 are provided on the first main tower gantry 61. The first winch 62 and the second winch 63 are fixedly connected to the load-bearing cable 4 through a first pulley block 64. A pulling force is applied to the mid-span load-bearing cable 4 through the first counter-pulling system 6 to make it move towards the side-span on the small-station side. During the adjustment process, it is necessary to accurately control the magnitude and direction of the pulling force to ensure that the alignment adjustment of the mid-span load-bearing cable 4 meets the design requirements.

[0059] Adjust the alignment of the load-bearing cable 4 through the first reverse tensioning system 6 to meet the design requirements. At the same time, correct the deviation of the first main tower 1 to eliminate the phenomenon that the top of the tower deviates from the designed position due to the unbalanced forces on both sides of the cable.

[0060] S400: Repeat steps S200 and S300 until the catwalk alignment of the side span and mid-span at the small station number reaches the designed alignment, and the deviation of the top of the first main tower 1 is not greater than 1 cm. Then restore the temporary fixation of the load-bearing cable 4 and the first main tower 1.

[0061] The first adjustment shrinkage of the load-bearing cables 4 in the side span and mid-span is 5 cm, and the subsequent adjustment shrinkage for each time should be 5 - 10 cm according to the measurement of the previous adjustment shrinkage. It is often difficult to achieve the design requirements for the catwalk alignment through one adjustment, and repeated adjustments are needed to gradually make the catwalk alignment reach the designed alignment. After each cycle of adjustment is completed, measure the catwalk alignment and the deviation of the tower column in a timely manner.

[0062] The adjustment amount of the catwalk load-bearing cable each time cannot be too large, otherwise the load-bearing cable 4 will generate a large horizontal force on the main tower, resulting in the deviation of the tower column exceeding the allowable range of the design. Excessive deviation of the tower column will not only affect the structural safety of the bridge tower, but may also cause difficulties in the subsequent erection of the main cable and installation of the suspenders; it will also cause the sag of the catwalk load-bearing cable 4 to change too quickly, making it difficult to control the adjustment accuracy of the catwalk, resulting in difficulty in reaching the design requirements even after multiple adjustments, which will not only increase the construction time and cost, but also affect the progress of the entire bridge construction.

[0063] During the adjustment process, pay attention to observing the tension change of the load-bearing cable 4 to ensure the smoothness and safety of the adjustment process. When both the catwalk alignment and the deviation of the tower column reach the design requirements, stop the adjustment; after the last adjustment is completed, conduct a comprehensive measurement again to ensure the accuracy and stability of the adjustment results.

[0064] S500: Measure the catwalk alignment of the side span at the large station number and the deviation of the top of the second main tower 2. If the deviation of the second main tower 2 is not greater than 1 cm, there is no need to adjust the catwalk alignment and the deviation of the top of the second main tower 2. If the deviation of the second main tower 2 is greater than 1 cm, it is necessary to adjust the catwalk alignment and the deviation of the top of the second main tower 2.

[0065] If the deviation of the second main tower 2 is not greater than 1 cm, the position error of the structure is very small and within the acceptable range. In this case, there is no need to make additional adjustments to the catwalk alignment or the deviation of the top of the second main tower 2. The current setting already meets the design requirements, and the next construction plan can be continued.

[0066] If the deviation of the second main tower 2 is greater than 1 cm, there is a certain degree of deviation in the structure, exceeding the allowable error range. To ensure the safety and stability of the bridge, it is necessary to adjust the catwalk alignment and the deviation of the top of the second main tower 2.

[0067] The main tower and catwalk are key structural parts of the bridge. If the deviation of the main tower exceeds the allowable range, it will affect the overall stability of the bridge and even cause structural safety hazards. Through timely adjustments, the main tower can be prevented from excessive deviation due to uneven force, and the final deviation error of the main tower after the bridge is completed can be reduced, thereby ensuring the safety and durability of the bridge structure.

[0068] S600: After all catwalk alignments are adjusted, the top deflections of the first main tower 1 and the second main tower 2 and the catwalk alignments are re-measured to determine whether repeated adjustments are required.

[0069] After the catwalk alignment has been comprehensively adjusted, in order to ensure the accuracy of the adjustment effect and the ultimate stability of the structure, the column offsets of the first main tower 1 and the second main tower 2 and the alignment of the entire catwalk need to be re-measured to see if they meet the design requirements, thereby ensuring that the bridge structure is subjected to reasonable stress.

[0070] If the re-measurement results show that the tower column deviations and catwalk alignments of the first main tower 1 and the second main tower 2 are within the allowable error range and meet the design requirements, no repeated adjustments are required; if the re-measurement finds that there are still deviations or non-compliance with the requirements, readjustments are required until the tower column deviations and catwalk alignments of the first main tower 1 and the second main tower 2 meet the design requirements.

[0071] Furthermore, step S500 specifically includes the following steps:

[0072] S510: If the top of the second main tower 2 is offset by no more than 1 cm, the alignment of the catwalk on the large pile side span and the top offset of the second main tower 2 are not adjusted. If the top of the second main tower 2 is offset by more than 1 cm, the temporary fixation on the mid-span side of the top of the second main tower 2 is released. After a certain period of time, the deformation of the load-bearing cable 4 is completed, and then the temporary fixation on the mid-span side of the top of the second main tower 2 is restored.

[0073] S520: Release the temporary fixation on the side span of the top of the second main tower 2, wait for a certain period of time, and after the deformation of the load-bearing cable 4 is completed, measure whether the deflection of the top of the second main tower 2 has been restored;

[0074] S530: If the top deviation of the second main tower 2 is not restored, and the temporary fixations on both sides of the top of the second main tower 2 are contacted, the large pile side span load-bearing cables 4 are adjusted through the second counter-tension system 7 until the top deviation of the second main tower 2 meets the requirements, and then the temporary fixations on both sides of the second main tower 2 are restored.

[0075] The second counter-tensioning system 7 includes a first main tower gantry 71 arranged at the top of the first main tower 2, and a third winch 72 and a fourth winch 73 are provided on the first main tower gantry 71. The third winch 72 and the fourth winch 73 are fixedly connected to the load-bearing cable 4 through a second pulley group 74.

[0076] Apply a tensile force to the mid-span load-bearing cable 4 through the second reverse pulling system 7 to make it move towards the mid-span side. During the adjustment process, it is necessary to precisely control the magnitude and direction of the tensile force to ensure that the deviation of the top of the second main tower 2 meets the design requirements.

[0077] When installing the first pulley block 64, the second pulley block 74 and the catwalk load-bearing cable 4, use a chain block to tighten each one by one and then fix it to the load-bearing cable 4 with rope clamps. By tightening each one with a chain block, the tension of each load-bearing cable can be precisely controlled, avoiding the deviation of the catwalk line shape caused by uneven tension. At the same time, using rope clamps for fixed connection can ensure the firmness and stability of the connection point, preventing loosening or slipping during the construction process, thus ensuring the overall structural accuracy of the catwalk. The operation of tightening with a chain block is relatively simple and easy to control, reducing the installation time and improving the construction efficiency. At the same time, the rope clamp fixed connection method is convenient for construction workers to operate, reducing the installation time and improving the construction efficiency.

[0078] Furthermore, during the process of using the adjustment system 5 to tension the load-bearing cable 4, closely monitor the straight and stressed condition of the high-strength threaded steel bar 53. If it is found that the high-strength threaded steel bar 53 has a tendency to bend, immediately stop the tensioning and handle it; if the high-strength threaded steel bar 53 bends during the tensioning process, it may cause local stress concentration, which may further lead to the fracture of the high-strength threaded steel bar 53. The fracture of the high-strength threaded steel bar 53 will not only damage the construction materials, but also may cause serious harm to the construction workers and equipment. The straight and stressed condition of the high-strength threaded steel bar 53 is the key to ensuring the construction quality. If the steel bar bends, it may cause uneven stress and affect the overall performance of the structure. Handling the bending tendency in a timely manner can prevent the structural deviation caused by the deformation of the high-strength threaded steel bar 53 and ensure that the construction accuracy meets the design requirements.

[0079] Furthermore, during the process of adjusting the catwalk line shape on the side span with a small mileage, observe the states of the handrail cable, side net and gantry support cable. If it is found that the side net and gantry are significantly skewed, adjust them in a timely manner and anchor them firmly.

[0080] The handrail cable, side net and gantry support cable of the catwalk are important components of the catwalk structure, jointly maintaining the stability and safety of the catwalk. The handrail cable, as the key guarantee for the safety of walking on the catwalk, its tightness and stability are crucial. Any slack or abnormal swing may indicate potential safety hazards. At the same time, the side net, as a protective facility, its integrity and firmness are directly related to the safety of construction workers. Especially in the high-altitude operation environment, any damage or skew of the side net may cause serious consequences.

[0081] In addition, as an important support part of the catwalk structure, the portal support cables cannot be ignored either. The stability of the portal depends on the correct installation and tensioning of the support cables. Once the support cables become slack or skewed, it will directly affect the overall stability of the portal, and may even pose a threat to the safety of the entire catwalk.

[0082] During the construction process, once obvious skewing phenomena are found in the side net and the portal, the construction personnel should immediately take actions to make necessary adjustments. This includes but is not limited to re-tensioning the slack rigging, adjusting the skewed components, and strengthening the connection parts, etc. After the adjustment is completed, anchoring operations are also required to ensure that all adjusted components can be firmly fixed in the predetermined positions to prevent displacement or loosening during the subsequent construction process.

[0083] The adjustment of the catwalk alignment is a key link to ensure the construction accuracy of the main cable. The states of the side net and the portal support cables directly affect the overall alignment of the catwalk. Timely adjustment of the skewed components can ensure that the catwalk alignment meets the design requirements, thus providing reliable support for the subsequent main cable construction.

[0084] Furthermore, after each cycle of adjustment, it is necessary to measure the catwalk alignment and the deviation of the top of the first main tower 1, and compare and analyze them with the designed catwalk alignment. By measuring the catwalk alignment and the deviation of the main tower top and comparing and analyzing them with the designed alignment, it is possible to timely detect the possible deviations during the construction process and correct these deviations, which can ensure that the construction accuracy meets the design requirements and avoid structural safety problems or difficulties in subsequent construction due to excessive deviations; conducting measurements and comparative analysis can form a dynamic monitoring record of the construction process. These records provide real-time and accurate information for construction management personnel, facilitating their comprehensive monitoring and management of construction progress, quality, safety, etc. Once problems are found, measures can be quickly taken to solve them to avoid the expansion of problems.

[0085] The method for precise adjustment of the catwalk alignment of the present invention can adapt to different tower deviation situations, and has strong adaptability and flexibility; by using the condition of stable night temperature for measurement, the accuracy of measurement is improved, the adjustment effect is enhanced, the data obtained from the measurement is analyzed through calculation, the precise adjustment of the catwalk alignment is realized, the construction efficiency and safety are improved, the construction quality is ensured at the same time, the maintenance cost is reduced, and the structural stability is enhanced; by setting an adjustment system 5 on the anchor block, the alignment of the side span with a small mileage and the deviation of the top of the first main tower 1 are adjusted, and by setting a first anti-pulling system 6 and a second anti-pulling system 7 on the tops of the first main tower 1 and the second main tower 2, the alignment of the middle span and the side spans with a large mileage is adjusted, as well as the deviation of the top of the second main tower 2, to ensure that the catwalk alignment and the deviation of the top of the main tower meet the design requirements, avoid excessive deviation of the main tower due to uneven stress, and reduce the final deviation error of the main tower after the completion of the bridge; by controlling the shrinkage amount of the load-bearing cable 4 for each adjustment, the catwalk alignment is gradually made to reach the design alignment. After each cycle of adjustment is completed, the catwalk alignment and the deviation of the tower column are measured in a timely manner, ensuring the structural safety of the main tower, avoiding too rapid change in the sag of the catwalk load-bearing cable 4, making it difficult to control the adjustment accuracy of the catwalk, and resulting in difficulty in reaching the design requirements even after multiple adjustments, which will not only increase the construction time and cost and affect the progress of the entire bridge construction.

[0086] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for precisely adjusting the alignment of a continuous catwalk, characterized in that, The following steps are involved: S100: After the catwalk is erected and temporarily fixed to the first main tower (1) and the second main tower (2), the catwalk alignment and the deviation of the first main tower (1) and the second main tower (2) are measured by a measuring device, and the measurement data are collated and then the catwalk alignment adjustment calculation and analysis are performed; S200: The adjustment system (5) is set on the anchor (3) of the catwalk, and the temporary fixation of the side span bearing cable (4) of the first main tower (1) is released. The small pile side span bearing cable (4) is adjusted by the adjustment system (5), so that the small pile side span bearing cable (4) moves toward the anchor (3), and the catwalk line shape and the tower top deviation of the first main tower (1) are adjusted; S300: After the alignment adjustment of the catwalk for measuring the side span of the small pile number is completed, the temporary fixation on the middle span side of the first main tower (1) is released, and the middle span load-bearing cable (4) is adjusted through the first reverse pull system (6) so that the middle span load-bearing cable moves toward the side span of the small pile number, and the alignment of the catwalk and the offset of the top of the first main tower (1) are adjusted; S400: Repeat steps S200 and S300 until the alignment of the side span and the mid-span catwalk of the small pile number reaches the designed alignment, and the deviation of the top of the first main tower (1) is not greater than 1 cm, and then restore the temporary fixation of the load-bearing cable (4) and the first main tower (1); S500: Measure the alignment of the side span catwalk and the deviation of the top of the second main tower (2) measured by the large pile number. If the deviation of the second main tower (2) is not greater than 1 cm, there is no need to adjust the alignment of the catwalk and the deviation of the top of the second main tower (2). If the deviation of the second main tower (2) is greater than 1 cm, it is necessary to adjust the alignment of the catwalk and the deviation of the top of the second main tower (2); S600: After all adjustments to the catwalk alignment are completed, the top deviations of the first main tower (1) and the second main tower (2) and the catwalk alignment are re-measured to determine whether repeated adjustments are required.

2. The continuous catwalk alignment fine-tuning method according to claim 1, wherein The adjustment system (5) includes a plurality of anchor seats (51), through holes are provided on both sides of the anchor seats (51), an anchor head (52) is fixedly installed at the end of the load-bearing cable (4), the anchor head (52) is rotatably connected to the anchor seat (51), a reaction beam (54) is provided at the end of the anchor head (52), the reaction beam (54), the anchor seat (51) and the anchor (3) are connected through a fine-rolled threaded steel bar (53), one end of which is fixedly installed on the anchor (3), and the other end is connected to a jack (56), and the load-bearing cable (4) is driven by tensioning or relaxing the fine-rolled threaded steel bar (53) through the jack (56).

3. A continuous catwalk linearity fine-tuning method according to claim 1, characterized in that The first counter-pull system (6) comprises a first main tower gantry (61) arranged at the top of the first main tower (1); a first hoist (62) and a second hoist (63) are provided at the top of the first main tower gantry (61); the first hoist (62) and the second hoist (63) are fixedly connected to the load-bearing cable (4) via a first pulley group (64).

4. A continuous catwalk linear precise adjustment method according to claim 1, characterized in that The second counter-tensioning system (7) comprises a first main tower gantry (71) arranged at the top of the first main tower (2); a third hoist (72) and a fourth hoist (73) are provided on the first main tower gantry (71); the third hoist (72) and the fourth hoist (73) are fixedly connected to the load-bearing cable (4) via a second pulley group (74).

5. A continuous catwalk alignment fine-tuning method according to any one of claims 1-4, characterized in that In step S500, the following steps are specifically included: S510: If the deviation of the top of the second main tower (2) is not greater than 1 cm, the alignment of the catwalk on the side span with the larger mileage and the deviation of the top of the second main tower (2) are not adjusted this time. If the deviation of the top of the second main tower (2) is greater than 1 cm, the temporary fixation on the mid-span side of the top of the second main tower (2) is released, wait for a certain period of time until the deformation of the load-bearing cable (4) is completed, and then restore the temporary fixation on the mid-span side of the top of the second main tower (2); S520: Then release the temporary fixation on the side span side of the top of the second main tower (2), wait for a certain period of time until the deformation of the load-bearing cable (4) is completed, and then measure whether the deviation of the top of the second main tower (2) is restored; S530: If the deviation of the top of the second main tower (2) is not restored, simultaneously release the temporary fixations on both sides of the top of the second main tower (2), and adjust the load-bearing cable (4) on the side span with the larger mileage through the second anti-pulling system (7) until the deviation of the top of the second main tower (2) meets the requirements, and then restore the temporary fixations on both sides of the second main tower (2).

6. A method for precisely adjusting the alignment of a continuous catwalk according to claim 5, characterized in that During the process of using the adjustment system (5) to tension the load-bearing cable (4), closely monitor the straight and stressed condition of the high-strength threaded steel bar (53). If it is found that the high-strength threaded steel bar (53) has a tendency to bend, immediately stop the tensioning and handle it.

7. A continuous catwalk linearity fine-tuning method according to any one of claims 1-4, characterized in that, The first adjustment shrinkage of the side span and mid-span load-bearing cables (4) is 5 cm, and the shrinkage for each subsequent adjustment should be 5 - 10 cm according to the measurement of the shrinkage in the previous adjustment.

8. A method for precisely adjusting the alignment of a continuous catwalk according to any one of claims 1-4, characterized in that When installing the first pulley block (64) and the second pulley block (74) on the catwalk load-bearing cable (4), use a chain block to tighten each one by one and then fix it to the load-bearing cable (4) with rope clamps.

9. A continuous catwalk linear fine-tuning method according to any one of claims 1-4, characterized in that, During the adjustment of the catwalk alignment on the side span with the smaller mileage, the states of the handrail cable, side net, and gantry support cable should be observed. If it is found that the side net and gantry are significantly skewed, adjust them in a timely manner and anchor them firmly.

10. A method for precisely adjusting the alignment of a continuous catwalk according to any one of claims 1-4, characterized in that, After each cycle of adjustment is completed, it is necessary to measure the catwalk alignment and the deviation of the top of the first main tower (1), and compare and analyze them with the designed catwalk alignment.

Images