A method for controlling self-balanced tension and tower deviation of a long-span steel pipe arch bridge by cable-stayed and buckle hanging

Abstract

The present application relates to the field of bridge construction technology, especially relates to a large-span steel pipe arch bridge cable-stayed buckle hanging self-balancing tensioning and tower deviation control method, the method comprises the following steps: arranging a buckle hanging cable between a buckle hanging force structure and an arch rib segment to be installed, and arranging a balance cable for balancing the horizontal action of the buckle hanging cable; obtaining the cable force and geometric parameters of the buckle hanging cable and the balance cable; determining the horizontal action amount of the buckle hanging cable and the balance cable acting on the buckle hanging force structure according to the cable force and the geometric parameters, and determining the cable system tensioning control amount according to the horizontal action amount; tensioning the buckle hanging cable and the balance cable according to the cable system tensioning control amount, so that the horizontal resultant force of the buckle hanging cable and the balance cable acting on the buckle hanging force structure meets the preset horizontal balance condition. The present application provides continuous and consistent control basis for different construction stages, reduces the difficulty of repeated adjustment in the construction process, improves the controllability of the arch rib segment cable-stayed buckle hanging construction, and thus improves the overall stability of the large-span steel pipe arch bridge cable-stayed buckle hanging construction process.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for self-balancing tensioning and tower deflection control of cable-stayed bridges with long-span steel pipe arch bridges. Background Technology

[0002] Large-span steel pipe arch bridges typically have characteristics such as large span, heavy arch rib segments, and significant limitations imposed by terrain on the construction site. In complex terrain conditions such as canyons and deep ravines, the main arch rib construction often adopts the inclined cable-stayed method for segment installation. This construction method generally uses cable-stayed cables to temporarily fasten the arch rib segments to be installed, and uses corresponding balance cables or anchoring systems to balance the horizontal forces during construction, so as to ensure that the arch rib segments are in a controlled state before forming a complete arch ring.

[0003] During the construction of the cable-stayed structure, as the arch rib segments are installed one by one, the cable force, spatial position, and direction of force of the cable-stayed and balancing cables will change with the construction stage. The cable-stayed structure is simultaneously subjected to horizontal forces from different cable systems. If the tension control and coordination between the cable systems are insufficient, the cable-stayed structure is prone to being in an unbalanced stress state, thereby increasing the difficulty of controlling the installation alignment and construction stress state of the arch rib segments.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a method for self-balancing tensioning and tower deflection control of cable-stayed bridges with long-span steel pipe arch bridges, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A self-balancing tensioning method for cable-stayed long-span steel pipe arch bridges, the method comprising: A fastening cable is arranged between the fastening load-bearing structure and the arch rib segment to be installed, and a balancing cable is arranged to balance the horizontal action of the fastening cable. Obtain the cable force and geometric parameters of the fastening cable and the balancing cable; Based on the cable force and the geometric parameters, determine the horizontal action of the fastening cable and the balancing cable on the fastening force-bearing structure, and determine the cable tension control amount based on the horizontal action amount; The fastening cable and the balance cable are tensioned according to the cable tension control amount, so that the horizontal resultant force of the fastening cable and the balance cable acting on the fastening force-bearing structure satisfies the preset horizontal balance condition. The tension control amount of the cable system is repeatedly determined and tensioned for the subsequent arch rib segments to be installed until the inclined cable-stayed construction of the predetermined arch rib segments is completed.

[0007] Furthermore, the horizontal action amount includes a first horizontal action amount of the fastening cable acting on the fastening force-bearing structure, and a second horizontal action amount of the balancing cable acting on the fastening force-bearing structure, and the preset horizontal balance condition includes the difference between the first horizontal action amount and the second horizontal action amount being within a preset difference range.

[0008] Furthermore, the first horizontal action amount is determined based on the cable force of the hooking cable and the components of the geometric parameters of the hooking cable in the horizontal action direction, and the second horizontal action amount is determined based on the cable force of the balancing cable and the components of the geometric parameters of the balancing cable in the horizontal action direction.

[0009] Furthermore, the preset horizontal balance conditions include: Based on the cable force and geometric parameters of the fastening cable and the balancing cable, the horizontal resultant force control value of the fastening force-bearing structure is determined according to the following formula: ; in, Let be the tension of the i-th lashing cable. Let be the angle between the i-th hooking cable and the direction of the horizontal component of the force. Let J be the tension in the j-th balancing cable. Let R be the angle between the j-th balancing cable and the direction of the horizontal component force, and R be the horizontal resultant force control value of the fastening force-bearing structure. When the horizontal resultant force control value R exceeds the preset allowable range, the cable tension control amount is corrected according to the horizontal resultant force control value R.

[0010] Further, tensioning the fastening cable and the balance cable according to the aforementioned cable tension control amount includes: The tension control quantity of the cable system is decomposed into multiple tension stages; In each tensioning stage, the tensioning component of the fastening cable corresponding to the fastening cable and the tensioning component of the balance cable corresponding to the balance cable are determined respectively. The fastening cable and the balance cable are tensioned in a coordinated manner according to the tensioning component of the fastening cable and the tensioning component of the balance cable, and the horizontal resultant force is re-determined after the current tensioning stage is completed; When the re-determined horizontal resultant force satisfies the preset horizontal balance condition, the next tensioning stage is entered; when the re-determined horizontal resultant force does not satisfy the preset horizontal balance condition, the tensioning component of the fastening cable and / or the tensioning component of the balancing cable corresponding to the current tensioning stage is corrected.

[0011] Furthermore, the tension components of the anchor cable and / or the tension components of the balancing cable corresponding to the current tension level are corrected, including: The deviation of the horizontal resultant force is determined based on the difference between the newly determined horizontal resultant force at the current tensioning stage and the preset horizontal equilibrium condition. Based on the degree of influence of the fastening cable and the balancing cable on the horizontal resultant force, the deviation of the horizontal resultant force is distributed to the fastening cable and / or the balancing cable; The tension component of the fastening cable and / or the tension component of the balancing cable are adjusted according to the allocation results.

[0012] Furthermore, the fastening force-bearing structure includes a junction pier, and the tensioning ends of the fastening cable and the balance cable are both located on the junction pier.

[0013] Furthermore, the feature is that, before tensioning the hook cable and the balance cable according to the cable tension control amount, at least one of the hook cable and the balance cable is pre-tensioned synchronously.

[0014] Furthermore, when the arch rib segments on both sides of the hook-and-hold structure are not in asymmetrical hoisting state, the stabilizing cable used to compensate for the unbalanced horizontal action is used as at least part of the balancing cable, and the stabilizing cable is tensioned or relaxed according to the tension control amount of the cable system.

[0015] A tower deflection control method is applied to the junction pier during the cable-stayed construction of an arch rib segment of a steel pipe arch bridge equipped with a fastening cable and a balancing cable. The fastening cable connects the junction pier to the arch rib segment to be installed, and the balancing cable is used to balance the horizontal force of the fastening cable on the junction pier. The method includes: Obtain the cable force and geometric parameters of the hanging cable and the balance cable, and obtain the measured tower deflection of the junction pier; The horizontal force of the cable and the balance cable acting on the junction pier is determined based on the cable force and the geometric parameters, and the tension control amount of the cable system is determined based on the horizontal force and the measured tower deflection. According to the tension control amount of the cable system, at least one of the fastening cable and the balance cable is tensioned and adjusted so that the horizontal resultant force of the fastening cable and the balance cable acting on the junction pier satisfies the preset horizontal balance condition, and the measured tower deviation is within the preset allowable range. During the subsequent construction of the arch rib segments to be installed, the tension control amount of the cable system is repeatedly determined and tension is adjusted until the inclined cable-stayed construction of the predetermined arch rib segments is completed.

[0016] The technical solution of this invention can achieve the following technical effects: During the construction of the cable-stayed arch rib segments of a long-span steel pipe arch bridge, improving the coordination of the horizontal forces acting on the cable-stayed structure reduces stress deviations caused by imbalances in horizontal forces during construction, making the structural stress state of the arch rib segments more stable during installation. It also provides a continuous and consistent control basis for different construction stages, reducing the difficulty of repeated adjustments during construction, improving the controllability of the cable-stayed arch rib segment construction, and thus enhancing the overall stability of the cable-stayed construction process for long-span steel pipe arch bridges.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the process for the self-balancing tensioning method of cable-stayed bridges with long spans of steel pipe arches; Figure 2 Logic diagram for determining horizontal action quantity and cable tension control quantity; Figure 3 Flowchart for stabilizing cable compensation under asymmetrical hoisting conditions; Figure 4 This is a flowchart of the tower deflection control method. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] Example 1: like Figure 1As shown, this application provides a self-balancing tensioning method for cable-stayed bridges with long spans of steel pipe arches. The method includes: In this embodiment, the fastening load-bearing structure can be a junction pier, fastening tower, pier anchorage structure, or other temporary or permanent load-bearing structure used to bear the tension reaction force of the fastening cable and the balancing cable. The fastening cable is used to connect the fastening load-bearing structure to the arch rib segment to be installed for temporary fastening. The balancing cable is used to balance the horizontal force exerted by the fastening cable on the fastening load-bearing structure. The balancing cable can be connected to the ground anchor, anchorage structure, adjacent arch rib segment, or other structure that can provide the opposite horizontal force.

[0023] S10: Arrange the fastening cable between the fastening load-bearing structure and the arch rib segment to be installed, and arrange the balancing cable for the horizontal action of the fastening cable. Specifically, before the arch rib segment to be installed is hoisted, the arrangement of the hanging cable and the balance cable is determined according to the designed installation position of the arch rib segment, the position of the hook-on load-bearing structure, and the stress requirements of the construction stage. One end of the hanging cable is connected to the hook-on load-bearing structure, and the other end is used to connect to the hook-on connection position of the arch rib segment to be installed. One end of the balance cable is connected to the hook-on load-bearing structure, and the other end is connected to the position that can provide a balancing reaction force.

[0024] When arranging the fastening cables and balancing cables, the horizontal force exerted by the fastening cables on the fastened structure should have at least opposite horizontal components to the horizontal force exerted by the balancing cables on the fastened structure. Thus, the fastening cables and balancing cables can together form a cable system for controlling the horizontal stress state of the fastened structure.

[0025] S20: Obtain the cable force and geometric parameters of the sling and balance cable; Specifically, after the fastening cables and balance cables are arranged, the current cable force of the fastening cables and balance cables is obtained. The cable force can be obtained by force measuring devices set on the tensioning end, anchoring end or cable body, or it can be calculated from the tensioning force data of the tensioning equipment.

[0026] Simultaneously, the geometric parameters of the anchoring cable and the balancing cable are obtained. These geometric parameters are used to determine the component of the corresponding cable force in the horizontal direction and may include the spatial coordinates of the two ends of the anchoring cable and the balancing cable, the spatial direction of the cable body, the cable length, the cable angle, or other parameters that can determine the horizontal component of the cable force.

[0027] S30: Based on the cable force and geometric parameters, determine the horizontal action of the fastening cable and the balancing cable on the fastening load-bearing structure, and determine the cable tension control amount based on the horizontal action amount; Specifically, based on the cable force and geometric parameters of the sling, the horizontal action of the sling on the sling-loaded structure is determined; based on the cable force and geometric parameters of the balance cable, the horizontal action of the balance cable on the sling-loaded structure is determined; for multiple slings and multiple balance cables, the horizontal action of each sling and each balance cable can be calculated separately, and the horizontal action in the same direction can be summed.

[0028] S40: Tension the fastening cable and the balance cable according to the cable tension control amount, so that the horizontal resultant force of the fastening cable and the balance cable acting on the fastening force-bearing structure meets the preset horizontal balance condition. Specifically, based on the cable tension control amount obtained in step S3, the fastening cable and the balance cable are tensioned or adjusted. During the tensioning process, the fastening cable and the balance cable can be tensioned synchronously or in stages according to a predetermined sequence. After each tensioning or tensioning stage is completed, the actual cable force of the fastening cable and the balance cable is reacquired, and the horizontal resultant force is re-determined in combination with the corresponding geometric parameters.

[0029] When the newly determined horizontal resultant force is within the preset allowable range, it is determined that the horizontal resultant force of the fastening cable and the balance cable acting on the fastening load-bearing structure meets the preset horizontal balance condition. At this time, the tension state of the corresponding cable can be locked, or the next construction stage can be entered.

[0030] When the redefined horizontal resultant force is not within the preset allowable range, the cable tension control amount is corrected according to the deviation of the horizontal resultant force, and at least one of the fastening cable and the balance cable is tensioned again until the horizontal resultant force meets the preset horizontal balance condition.

[0031] The preset horizontal balance conditions can be determined based on the allowable deviation of the hanging load-bearing structure, the allowable stress state, construction monitoring requirements, or design control requirements.

[0032] S50: Repeat the determination of cable tension control for subsequent arch rib segments to be installed and tension them until the inclined cable-stayed construction of the predetermined arch rib segments is completed.

[0033] Specifically, after the current arch rib segment to be installed is completed with the inclined cable fastening and meets the preset control requirements, the construction of the subsequent arch rib segments to be installed continues. For each subsequent arch rib segment to be installed, the corresponding horizontal action and cable tension control amount are re-determined based on the actual cable force and geometric parameters of the fastening cable and balance cable at this construction stage, and tension control is carried out according to the cable tension control amount.

[0034] As the cable force state, spatial direction, and horizontal force on the hanging structure change with each construction stage during the segmental installation of the arch rib, repeating the above control process in subsequent construction can ensure that the resultant horizontal force at different construction stages meets the preset horizontal equilibrium conditions.

[0035] The technical solution of this invention improves the coordination of the horizontal forces on the hanging structure, reduces the stress deviation caused by the imbalance of horizontal forces during the construction stage, reduces the difficulty of repeated adjustments during the construction process, and improves the controllability of the cable-stayed hanging construction of the arch rib segment, thereby improving the overall stability of the cable-stayed hanging construction process of large-span steel pipe arch bridges.

[0036] Furthermore, the horizontal action includes the first horizontal action of the sling acting on the sling-loaded structure, and the second horizontal action of the balancing cable acting on the sling-loaded structure. The preset horizontal balance condition includes the difference between the first horizontal action and the second horizontal action being within a preset difference range.

[0037] Specifically, first, the horizontal action control direction of the anchoring structure is determined. Then, based on the cable force and geometric parameters of the anchoring cable and the balancing cable, the components of the anchoring cable and the balancing cable in this horizontal action control direction are calculated respectively. The horizontal component corresponding to the anchoring cable is taken as the first horizontal action quantity, and the horizontal component corresponding to the balancing cable is taken as the second horizontal action quantity. When there are multiple anchoring cables, the first horizontal action quantity is the sum of the horizontal components of each anchoring cable; when there are multiple balancing cables, the second horizontal action quantity is the sum of the horizontal components of each balancing cable. The preset horizontal balance condition is that the difference between the first and second horizontal action quantities is within a preset difference range. The preset difference range can be determined according to the allowable horizontal force, allowable deviation, or construction control requirements of the anchoring structure. When the difference between the first and second horizontal action quantities is within the preset difference range, it is determined that the horizontal action of the anchoring cable and the balancing cable on the anchoring structure meets the balance requirements. When the difference exceeds the preset difference range, the cable tension control quantity is determined or corrected based on the difference.

[0038] Furthermore, the first horizontal force is determined based on the cable force of the sling and the components of the sling's geometric parameters in the horizontal direction, while the second horizontal force is determined based on the cable force of the balancing cable and the components of the balancing cable's geometric parameters in the horizontal direction.

[0039] In one implementation, the horizontal direction of the force-bearing structure is first determined. The horizontal direction can be the direction in which the hooking cable exerts the main horizontal force on the hooking structure, or it can be the direction in which horizontal balance control is required during construction. The geometric parameters are used to characterize the spatial attitude of the hooking cable and the balance cable relative to the horizontal direction. They can be the angle between the cable body and the horizontal direction, or they can be the direction parameters obtained by converting the spatial coordinates of the two ends of the cable body.

[0040] When the geometric parameter is an included angle, the force of the sling is decomposed into the horizontal direction according to the included angle, and the horizontal component corresponding to the sling is obtained. This horizontal component is used as the first horizontal force. The force of the balancing cable is decomposed into the horizontal direction according to the included angle, and the horizontal component corresponding to the balancing cable is obtained. This horizontal component is used as the second horizontal force. When there are multiple slings or balancing cables, the components of each sling and each balancing cable in the horizontal direction are calculated separately, and the horizontal components of each sling are summed to obtain the first horizontal force. The horizontal components of each balancing cable are summed to obtain the second horizontal force.

[0041] In this way, the actual cable forces of the sling and balance cables can be converted into horizontal forces acting on the sling structure, providing a calculation basis for subsequent judgment of whether the horizontal forces are balanced and for determining the tension control of the cable system.

[0042] Furthermore, such as Figure 2 As shown, the preset horizontal balance conditions include: Based on the cable forces and geometric parameters of the anchoring cables and balancing cables, the horizontal resultant force control value of the anchoring structure is determined according to the following formula: ; in, Let be the tension of the i-th lashing cable. Let be the angle between the i-th hooking cable and the direction of the horizontal component of the force. Let J be the tension in the j-th balancing cable. Let be the angle between the j-th balancing cable and the direction of the horizontal component force, and R be the control value of the horizontal resultant force of the hanging force-bearing structure; When the horizontal resultant force control value R exceeds the preset allowable range, the cable tension control amount is adjusted according to the horizontal resultant force control value R.

[0043] Based on the above embodiments, the preset horizontal balance condition is represented by the horizontal resultant force control value R, which reflects the difference in the horizontal action of the fastening cable and the balance cable on the fastening force structure.

[0044] Specifically, first determine the direction of the horizontal component force, and obtain the force of each hooking cable and each balancing cable and the angle between them and the direction of the horizontal component force. The subscript k represents the hooking cable and the subscript b represents the balancing cable. For the i-th hooking cable, its force is T_k,i and the angle is α_k,i; for the j-th balancing cable, its force is T_b,j and the angle is α_b,j.

[0045] In the formula, ∑T_k,i cosα_k,i represents the sum of the forces exerted by each hooking cable in the direction of the horizontal component force, and ∑T_b,jcosα_b,j represents the sum of the forces exerted by each balancing cable in the direction of the horizontal component force.

[0046] When R is within the preset allowable range, it is determined that the horizontal action of the fastening cable and the balance cable on the fastened force-bearing structure meets the balance requirements; when R exceeds the preset allowable range, the cable tension control amount is adjusted according to the value and direction of R. For example, if R is positive and exceeds the preset allowable range, it indicates that the horizontal action on the fastening cable side is too large, and the tension of the balance cable can be increased or decreased; if R is negative and exceeds the preset allowable range, it indicates that the horizontal action on the balance cable side is too large, and the tension of the fastening cable can be increased or decreased.

[0047] Furthermore, tensioning the anchor cables and balance cables according to the cable tension control amount includes: The tension control quantity of the cable system is decomposed into multiple tension stages; In each tensioning stage, the tension component of the sling cable corresponding to the sling cable and the tension component of the balance cable corresponding to the balance cable are determined respectively; The fastening cable and the balance cable are tensioned in a coordinated manner according to the tensioning components of the fastening cable and the balance cable, and the horizontal resultant force is re-determined after the current tensioning stage is completed. When the redefined horizontal resultant force meets the preset horizontal equilibrium condition, proceed to the next tensioning stage; when the redefined horizontal resultant force does not meet the preset horizontal equilibrium condition, correct the tensioning component of the fastening cable and / or the tensioning component of the balancing cable corresponding to the current tensioning stage.

[0048] In this embodiment, based on the target cable force, current cable force, and construction stage control requirements of the anchoring cable and balancing cable, the cable tension control quantity is decomposed into multiple tension levels. Each tension level corresponds to one tension adjustment. The number of tension levels can be determined based on the allowable tension amount per instance, the capacity of the tensioning equipment, and construction monitoring requirements. In each tension level, the anchoring cable tension component and the balancing cable tension component are determined respectively. The anchoring cable tension component is used to control the cable force change of the anchoring cable in the current tension level, and the balancing cable tension component is used to control the cable force change of the balancing cable in the current tension level. The two are determined based on the horizontal resultant force control target corresponding to the current tension level.

[0049] During tensioning, the sling and balance cables are tensioned in tandem according to the tensioning components of the sling and balance cables. The tandem tensioning can be synchronous tensioning or step-by-step tensioning in a predetermined order, as long as the horizontal action of the sling and balance cables tends to be balanced after the current tensioning stage is completed.

[0050] After the current tensioning stage is completed, the actual cable forces of the anchor cable and balance cable are reacquired, and the horizontal resultant force is re-determined based on the geometric parameters. If the re-determined horizontal resultant force meets the preset horizontal balance condition, the next tensioning stage is started; if the horizontal resultant force does not meet the preset horizontal balance condition, the tensioning components of the anchor cable and / or balance cable in the current tensioning stage are corrected according to the deviation of the horizontal resultant force, and tensioning adjustment is performed again.

[0051] Furthermore, the correction of the tension components of the anchor cable and / or the tension components of the balancing cable corresponding to the current tension level includes: The deviation of the horizontal resultant force is determined based on the difference between the newly determined horizontal resultant force at the current tensioning stage and the preset horizontal equilibrium condition. Based on the degree of influence of the anchoring cable and the balancing cable on the horizontal resultant force, the deviation of the horizontal resultant force is distributed to the anchoring cable and / or the balancing cable; Adjust the tension components of the clasp cable and / or the tension components of the balance cable based on the allocation results.

[0052] Specifically, the horizontal resultant force deviation is first determined based on the difference between the horizontal resultant force after the current tensioning stage is completed and the preset horizontal equilibrium condition. The preset horizontal equilibrium condition can correspond to the target horizontal resultant force or the allowable deviation range. When the preset horizontal equilibrium condition corresponds to the target horizontal resultant force, the horizontal resultant force deviation is the difference between the current horizontal resultant force and the target horizontal resultant force; when the preset horizontal equilibrium condition corresponds to the allowable deviation range, the horizontal resultant force deviation is the portion of the current horizontal resultant force that exceeds the allowable deviation range.

[0053] After determining the horizontal resultant force deviation, assess the influence of the anchoring cables and balancing cables on the horizontal resultant force. The degree of influence can be determined based on the contribution of each cable's force change to the change in the horizontal component force, or based on the spatial direction of each cable, the horizontal component coefficient, or the current adjustable cable force range. Based on the degree of influence, allocate the horizontal resultant force deviation to the anchoring cables and / or balancing cables. Cables with a greater impact on the horizontal resultant force can be allocated larger correction amounts; cables with a smaller adjustable range or close to the control limit can be allocated smaller correction amounts. After completing the deviation allocation, adjust the anchoring cable tension component and / or balancing cable tension component of the current tensioning stage according to the allocation results, and then perform tension adjustment again according to the corrected tension components. After adjustment, redetermine the horizontal resultant force; if the horizontal resultant force meets the preset horizontal balance condition, proceed to the next tensioning stage.

[0054] Furthermore, the load-bearing structure includes the junction pier, and the tensioning ends of the hanging cable and the balance cable are all located on the junction pier.

[0055] Specifically, the boundary pier serves as the load-bearing structure for the tension reaction forces of the anchor cables and balance cables. One end of the anchor cable connects to the arch rib segment to be installed, and the other end leads to the boundary pier to form the tensioning end. One end of the balance cable connects to the ground anchor, adjacent arch rib segment, or other balancing anchorage location, and the other end leads to the boundary pier to form the tensioning end. The tensioning ends of the anchor cables and balance cables can be respectively located in the anchorage zone, anchor beam, pre-embedded anchorage component, or tensioning platform on the boundary pier. The tensioning equipment applies tension force to the anchor cables and balance cables through the tensioning ends, concentrating the tensioning operation of both types of cables at the boundary pier.

[0056] When this arrangement is adopted, the horizontal action of the suspending cable and the balancing cable on the junction pier can be coordinated and controlled on the same stress structure, which makes it easy to determine the amount of horizontal action based on the cable force and geometric parameters, and adjust the tension control amount of the cable system accordingly.

[0057] Furthermore, before tensioning the anchor cable and the balance cable according to the cable tension control amount, at least one of the anchor cable and the balance cable shall be pre-tensioned simultaneously.

[0058] In one implementation, at least one of the fastening cable and the balance cable is pre-tensioned synchronously before formal tensioning is performed according to the cable tension control amount.

[0059] Specifically, when the anchoring cable or balance cable is composed of multiple steel strands, after anchoring, initial tension is simultaneously applied to the multiple steel strands within the same cable bundle to bring each steel strand to a preset initial tension range. Synchronous pre-tensioning can be performed on the anchoring cable, the balance cable, or both separately.

[0060] After synchronous pretensioning is completed, the initial cable force of the corresponding cable bundle is obtained. If the initial cable force meets the preset initial tension requirement, the formal tensioning process corresponding to the cable tensioning control amount is entered; if the initial cable force does not meet the preset initial tension requirement, the pretensioning force of the corresponding cable bundle is adjusted.

[0061] Furthermore, such as Figure 3 As shown, when the arch rib segments on both sides of the load-bearing structure are not in asymmetrical hoisting state, the stabilizing cable used to compensate for the unbalanced horizontal action is used as at least part of the balancing cable, and the stabilizing cable is tensioned or relaxed according to the cable tension control amount.

[0062] Specifically, asymmetrical hoisting conditions can include differences in the number of installed arch rib segments on both sides, differences in segment weight, differences in cantilever length, or differences in the horizontal forces generated by the anchoring cables on both sides. When these conditions occur, the anchored load-bearing structure is prone to unbalanced horizontal forces. One end of the stabilizing cable is connected to the anchored load-bearing structure, and the other end is connected to the ground anchor, anchorage foundation, or other structures that can provide reverse constraints. When calculating the cable tension control, the cable force and geometric parameters of the stabilizing cable are included in the calculation of the horizontal force corresponding to the balancing cable. When the unbalanced horizontal force needs to be compensated by the stabilizing cable providing a reverse horizontal component, the stabilizing cable is tensioned according to the cable tension control. When the unbalanced horizontal force decreases or its direction changes, the stabilizing cable is relaxed according to the cable tension control. After tensioning or relaxing, the cable force and geometric parameters of the anchoring cable, balancing cable, and stabilizing cable are re-acquired, and it is re-determined whether the resultant horizontal force meets the preset horizontal balance conditions.

[0063] Example 2: Based on the same inventive concept as the self-balancing tensioning method for cable-stayed long-span steel pipe arch bridges described in the foregoing embodiments, this invention also provides a tower deflection control method, such as... Figure 4 As shown, this method is applied to the junction pier in the construction of a steel pipe arch bridge arch rib segment with cable-stayed connection and balancing cable. The cable-stayed connection connects the junction pier to the arch rib segment to be installed, and the balancing cable is used to balance the horizontal force of the cable-stayed connection on the junction pier. The method includes: Obtain the cable force and geometric parameters of the suspending cable and the balancing cable, and obtain the measured tower deflection of the junction pier; The horizontal force of the suspending cable and the balancing cable on the junction pier is determined based on the cable force and geometric parameters, and the tension control amount of the cable system is determined based on the horizontal force and the measured tower deflection. According to the tension control amount of the cable system, at least one of the hanging cable and the balance cable is tensioned and adjusted so that the horizontal resultant force of the hanging cable and the balance cable acting on the junction pier meets the preset horizontal balance condition and the measured tower deviation is within the preset allowable range. During the subsequent construction of the arch rib segments to be installed, the tension control amount of the cable system was repeatedly determined and the tension was adjusted until the inclined cable-stayed installation of the predetermined arch rib segments was completed.

[0064] The technical effects achieved by the method described above in this invention are as described in the above embodiments, and will not be repeated here.

[0065] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A self-balancing tensioning method for cable-stayed suspension of a large-span steel pipe arch bridge, applied to the cable-stayed suspension construction of the arch rib segment of a steel pipe arch bridge, characterized in that... The method includes: A fastening cable is arranged between the fastening load-bearing structure and the arch rib segment to be installed, and a balancing cable is arranged to balance the horizontal action of the fastening cable. Obtain the cable force and geometric parameters of the fastening cable and the balancing cable; Based on the cable force and the geometric parameters, determine the horizontal action of the fastening cable and the balancing cable on the fastening force-bearing structure, and determine the cable tension control amount based on the horizontal action amount; The fastening cable and the balance cable are tensioned according to the cable tension control amount, so that the horizontal resultant force of the fastening cable and the balance cable acting on the fastening force-bearing structure satisfies the preset horizontal balance condition. The tension control amount of the cable system is repeatedly determined and tensioned for the subsequent arch rib segments to be installed until the inclined cable-stayed construction of the predetermined arch rib segments is completed.

2. The self-balancing tensioning method for cable-stayed bridges of large span steel pipe arches according to claim 1, characterized in that, The horizontal action includes a first horizontal action of the fastening cable acting on the fastening force-bearing structure and a second horizontal action of the balancing cable acting on the fastening force-bearing structure. The preset horizontal balance condition includes the difference between the first horizontal action and the second horizontal action being within a preset difference range.

3. The self-balancing tensioning method for cable-stayed bridges with long spans of steel pipe arches according to claim 2, characterized in that, The first horizontal action amount is determined based on the cable force of the hooking cable and the components of the geometric parameters of the hooking cable in the horizontal action direction, and the second horizontal action amount is determined based on the cable force of the balancing cable and the components of the geometric parameters of the balancing cable in the horizontal action direction.

4. The self-balancing tensioning method for cable-stayed bridges with large spans of steel pipe arches according to claim 3, characterized in that, The preset horizontal balance conditions include: Based on the cable force and geometric parameters of the fastening cable and the balancing cable, the horizontal resultant force control value of the fastening force-bearing structure is determined according to the following formula: ； in, Let be the tension of the i-th lashing cable. Let be the angle between the i-th hooking cable and the direction of the horizontal component of the force. Let J be the tension in the j-th balancing cable. Let R be the angle between the j-th balancing cable and the direction of the horizontal component force, and R be the horizontal resultant force control value of the fastening force-bearing structure. When the horizontal resultant force control value R exceeds the preset allowable range, the cable tension control amount is corrected according to the horizontal resultant force control value R.

5. The self-balancing tensioning method for cable-stayed bridges with large spans of steel pipe arch bridges according to claim 1, characterized in that, Tensioning the fastening cable and the balance cable according to the aforementioned cable tension control amount includes: The tension control quantity of the cable system is decomposed into multiple tension stages; In each tensioning stage, the tensioning component of the fastening cable corresponding to the fastening cable and the tensioning component of the balance cable corresponding to the balance cable are determined respectively. The fastening cable and the balance cable are tensioned in a coordinated manner according to the tensioning component of the fastening cable and the tensioning component of the balance cable, and the horizontal resultant force is re-determined after the current tensioning stage is completed; When the re-determined horizontal resultant force satisfies the preset horizontal balance condition, the next tensioning stage is entered; when the re-determined horizontal resultant force does not satisfy the preset horizontal balance condition, the tensioning component of the fastening cable and / or the tensioning component of the balancing cable corresponding to the current tensioning stage is corrected.

6. The self-balancing tensioning method for cable-stayed bridges with large spans of steel pipe arch bridges according to claim 5, characterized in that, Correct the tension components of the anchor cable and / or the balance cable corresponding to the current tension level, including: The deviation of the horizontal resultant force is determined based on the difference between the newly determined horizontal resultant force at the current tensioning stage and the preset horizontal equilibrium condition. Based on the degree of influence of the fastening cable and the balancing cable on the horizontal resultant force, the deviation of the horizontal resultant force is distributed to the fastening cable and / or the balancing cable; The tension component of the fastening cable and / or the tension component of the balancing cable are adjusted according to the allocation results.

7. The self-balancing tensioning method for cable-stayed bridges with long spans of steel pipe arches according to claim 1, characterized in that, The fastening and load-bearing structure includes a junction pier, and the tensioning ends of the fastening cable and the balance cable are both located on the junction pier.

8. The self-balancing tensioning method for cable-stayed bridges of large span steel pipe arches according to claim 1, characterized in that, Before tensioning the hook cable and the balance cable according to the tension control amount, at least one of the hook cable and the balance cable shall be pre-tensioned synchronously.

9. The self-balancing tensioning method for cable-stayed bridges of large span steel pipe arches according to claim 1, characterized in that, When the arch rib segments on both sides of the hook-and-hold structure are not in asymmetrical hoisting state, the stabilizing cable used to compensate for the unbalanced horizontal action is used as at least part of the balancing cable, and the stabilizing cable is tensioned or relaxed according to the tension control amount of the cable system.

10. A tower deflection control method, applied to the junction pier during the cable-stayed construction of an arch rib segment of a steel pipe arch bridge equipped with a fastening cable and a balancing cable, wherein the fastening cable connects the junction pier to the arch rib segment to be installed, and the balancing cable is used to balance the horizontal force of the fastening cable on the junction pier, characterized in that... The method includes: Obtain the cable force and geometric parameters of the hanging cable and the balance cable, and obtain the measured tower deflection of the junction pier; The horizontal force of the cable and the balance cable acting on the junction pier is determined based on the cable force and the geometric parameters, and the tension control amount of the cable system is determined based on the horizontal force and the measured tower deflection. According to the tension control amount of the cable system, at least one of the fastening cable and the balance cable is tensioned and adjusted so that the horizontal resultant force of the fastening cable and the balance cable acting on the junction pier satisfies the preset horizontal balance condition, and the measured tower deviation is within the preset allowable range. During the subsequent construction of the arch rib segments to be installed, the tension control amount of the cable system is repeatedly determined and tension is adjusted until the inclined cable-stayed construction of the predetermined arch rib segments is completed.

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