Stress cable replacing device for single preformed hole of lower lug plate of suspension bridge sling and cable replacing method of stress cable replacing device

Abstract

The invention relates to a stress cable changing device for a single preformed hole of a lower lug plate of a suspension bridge sling and a cable changing method thereof, and belongs to the technical field of suspension bridges. Comprising a main cable, a box girder lug plate is arranged below the main cable, and a preformed hole is formed in the box girder lug plate; a temporary sling unit is arranged between the main cable and the preformed hole; a pushing unit is arranged on the sling to be replaced; a vertically-arranged counter-force beam is arranged on the outer side of the box girder lug plate, the bottom end of the counter-force beam is supported on the girder surface, and the counter-force beam and the pushing unit are arranged on the two sides of the temporary sling unit. A counter-force pull rod penetrates through the top of the counter-force beam and is fixedly connected with the counter-force beam; a horizontally-arranged cross beam is arranged among the counter-force pull rod, the temporary cable unit and the pushing unit, and the cross beam is fixedly connected with the counter-force pull rod, the temporary cable unit and the pushing unit. The counter-force beam is arranged on the beam face to serve as an auxiliary supporting point, and replacement of the single-preformed-hole stress sling is achieved. In the sling replacement process, the sum of the cable forces of the three slings at the same lifting point is kept unchanged.

Description

Technical Field

[0001] This invention relates to a stress-induced cable replacement device and method with a single pre-drilled hole in the lower ear plate of a suspension bridge cable, belonging to the field of suspension bridge technology. Background Technology

[0002] As the main force-transmitting component of a suspension bridge, the suspenders are subjected to dynamic forces such as vehicle loads and wind and rain vibrations over a long period of time. With the increase in bridge operating time, the suspender wires will suffer fatigue damage due to cyclic loads. Simultaneously, the suspenders are susceptible to corrosion or breakage due to their own structural design, damage to the PE sheath, and failure of the waterproofing system. Furthermore, the suspenders may be damaged by accidents such as vehicle collisions or fires. When the performance of the suspenders no longer meets the design requirements, they must be replaced. Suspension bridges typically have 1-2 pre-drilled ear plate holes. Suspension cable replacement usually involves installing auxiliary cables on the pre-drilled ear plate holes in the suspension bridge box girder. By tensioning the auxiliary cables, the cable force of the suspender to be replaced is simultaneously unloaded, thus completing the force conversion for replacement.

[0003] A patent (CN210134348U) discloses a method for replacing suspension cables in suspension bridge box girders where only one ear plate hole is pre-drilled. This method involves setting temporary cables at the replacement suspension point and multiple adjacent suspension points. These temporary cables distribute the cable force of the replacement cable, reducing the load on a single temporary cable and minimizing construction risks. While this method offers high safety, it involves multiple work areas, long construction time, and high costs. Furthermore, when the cable is replaced without stress, the vertical alignment of the steel box girder gradually changes, resulting in overall lifting at multiple suspension points and relative displacement between the cable and girder.

[0004] Patent CN509584874U discloses a suspension bridge cable replacement device using a one-sided straddle-type temporary cable self-balancing jacking mechanism. This method involves installing a temporary straddle-type cable clamp above the cable clamp of the cable to be replaced. The temporary cable straddles the temporary cable clamp and extends downwards to connect with a spreader beam. Forked ear plates and tension rods are installed in pre-drilled ear plate holes, and the tension rods are connected to the spreader beam. Forked ear plates and tension rods are also installed in the pre-drilled ear plate holes of cables at adjacent lifting points, similarly connected to the spreader beam. Two reaction frames connect the two spreader beams. A tension spreader beam is installed above the anchor cup of the cable to be replaced, and a jack is installed above it for connection with the reaction beam. Compared to a multi-lifting-point temporary cable tensioning system, this replacement method reduces the working area, road occupancy time, and cost. However, during the replacement of the slings, since the spreader beam is placed above the reaction frame, there is an interaction force between the spreader beam and the reaction frame when the temporary slings are tensioned. The tensioning of the temporary slings affects the jacking force of the slings to be replaced, which increases the difficulty of controlling the cable force and causes relative displacement between the cable beams. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a stress-replacing cable replacement device and method with a single pre-drilled hole in the lower ear plate of a suspension bridge cable, which addresses the aforementioned prior art. By arranging a reaction beam on the beam surface as an auxiliary support point, the stress-replacing cable with a single pre-drilled hole is replaced. During the cable replacement process, the total force of the three cables at the same lifting point remains unchanged, without affecting the relative spatial position between the cable beams.

[0006] The technical solution adopted by this invention to solve the above problems is as follows: a stress-replacing cable replacement device with a single reserved hole in the lower ear plate of a suspension bridge cable, comprising a main cable, a permanent cable clamp on the main cable, the top end of the cable being connected to the permanent cable clamp, a box girder ear plate below the main cable, the bottom end of the cable being connected to the box girder ear plate, and a reserved hole in the box girder ear plate; a temporary cable unit is provided between the main cable and the reserved hole, the temporary cable unit comprising a temporary cable, and temporary cable anchor cups being provided at the upper and lower ends of the temporary cable, one of the temporary cable anchor cups being connected to a temporary cable anchor cup via a temporary cable anchor cup. The cable clamp is fixed to the main cable, and the other temporary suspender cable anchor cup is connected to the reserved hole on the box girder ear plate through the temporary tensioning unit; the suspender cable to be replaced is equipped with a jacking unit; a vertically arranged reaction beam is provided on the outer side of the box girder ear plate, the bottom end of the reaction beam is supported on the beam surface, and the reaction beam and the jacking unit are located on both sides of the temporary suspender cable unit; a reaction tie rod is passed through the top of the reaction beam, and the two are fixedly connected; a horizontally arranged crossbeam is provided between the reaction tie rod, the temporary cable unit and the jacking unit, and the crossbeam is fixedly connected to the reaction tie rod, the temporary cable unit and the jacking unit.

[0007] The temporary tensioning unit includes a temporary tensioning rod, the lower end of which is provided with a temporary fork-shaped lug plate, which is connected to the pre-reserved hole of the box girder lug plate by a pin; the upper end of the temporary tensioning rod passes through the temporary cable anchor cup and the crossbeam, and the upper end of the temporary tensioning rod is fixedly connected to the crossbeam; a temporary jack and a temporary support foot are provided on the temporary tensioning rod between the crossbeam and the temporary cable anchor cup.

[0008] The jacking unit includes a jacking reaction frame, which is mounted on the anchor cup under the sling. Jacking rods are symmetrically inserted through the jacking reaction frame, and the lower end of each jacking rod is fixedly connected to the jacking reaction frame. A crossbeam is inserted through the upper end of each jacking rod, and the upper end of each jacking rod is fixedly connected to the crossbeam. Jacking jacks and jacking support feet are installed on the jacking rod between the jacking reaction frame and the crossbeam.

[0009] The height of the upper surface of the middle part of the crossbeam is higher than the height of both ends of the crossbeam.

[0010] A method for replacing a cable under stress in a single pre-drilled hole in the under-ear plate of a suspension bridge, the method comprising the following steps: Step 1: Install temporary sling units between the main cable and the reserved holes in the box girder ear plates. Step 2: Place the reaction beam on the outside of the box girder ear plate; pass the bottom end of the reaction tie rod through the reaction beam and fix it to the beam; pass the top end of the reaction tie rod through the crossbeam and fix it to the crossbeam. Step 3: Install the jacking unit on the sling to be replaced. The jacking unit pushes the sling until the lower pin is removable. Then remove the lower pin. Step 4: Tension the temporary cable in stages, and at the same time depressurize the cable to be replaced until the cable tension of the cable to be replaced is 0. Then remove the upper pin of the cable. Step 5: Remove the slings to be replaced; Step Six: Install the new slings, tension them in stages, and simultaneously depressurize the temporary slings until the new slings are fully tensioned; Step 7: Remove the temporary slings.

[0011] The distance between the reaction beam and the temporary cable is greater than or equal to the distance between the temporary cable and the cable to be replaced.

[0012] The safety factor of the crossbeam is greater than 2.

[0013] Compared with the prior art, the advantages of the present invention are as follows: a stress-replacing cable replacement device and method for a single reserved hole in the lower ear plate of a suspension bridge cable, wherein a reaction beam is provided on the beam surface, and the reaction beam is connected to the crossbeam by a reaction tie rod, which serves as the fulcrum for jacking the cable. It is applicable to the case of single or double ear plate holes reserved in the box girder of a suspension bridge; no welding fixation is required on site, which reduces the cumbersomeness of the cable replacement process.

[0014] This application employs a jacking device to push the sling to the exit pin, transferring the sling force to a temporary sling to complete the sling replacement. Throughout the entire sling replacement process, the total sling force at the sling's lifting point remains constant, without affecting the relative spatial position between the cable beams.

[0015] As one of the load-bearing components in the entire sling replacement system, the crossbeam is heightened in the middle to increase the bending modulus of the crossbeam section, making the safety factor of the crossbeam greater than 2, thus ensuring that the bending strength of the crossbeam section meets the requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a stress-replacing cable replacement device with a single pre-drilled hole in the lower ear plate of a suspension bridge cable according to an embodiment of the present invention; Figure 2 for Figure 1 Sectional view of AA; Figure 3 for Figure 1 BB section view; Figure 4 for Figure 1 CC section view; Figure 5This is a schematic diagram of the crossbeam moment of a stress-replacing cable replacement device with a single pre-reserved hole in the lower ear plate of a suspension bridge cable according to an embodiment of the present invention; Figure 6 A schematic diagram illustrating the force conversion during the removal of old cables; Figure 7 A diagram illustrating the cable force conversion process for installing the new cable; In the diagram: 1. Reaction beam, 2. Reaction tie rod, 3. Crossbeam, 4. Box girder ear plate, 5. Temporary fork-shaped ear plate, 6. Temporary tension rod, 7. Temporary sling lower anchor cup, 8. Temporary support foot, 9. Temporary jack, 10. Connecting nut, 11. Temporary sling, 12. Temporary sling upper anchor cup, 13. Temporary cable clamp, 14. Permanent cable clamp, 15. Main cable, 16. Sling, 17. Push rod, 18. Push jack, 19. Push reaction frame. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 , 2 As shown in Figures 3 and 4, this embodiment of a suspension bridge cable replacement device with a single pre-drilled hole in the lower ear plate includes a main cable 15, on which a permanent cable clamp 14 is installed. The top end of the cable 16 is connected to the permanent cable clamp 14. A box girder ear plate 4 is provided below the main cable 15, and the bottom end of the cable 16 is connected to the box girder ear plate 4. A pre-drilled hole is provided on the box girder ear plate 4. A temporary cable unit is provided between the main cable 15 and the pre-drilled hole. The temporary cable unit includes a temporary cable 11, with temporary cable anchor cups (upper anchor cup 12 and lower anchor cup 7) at its upper and lower ends. The upper anchor cup 12 is fixed to the main cable 15 by a temporary cable clamp 13, and the lower anchor cup 7 is connected to the pre-drilled hole on the box girder ear plate 4 by a temporary tensioning unit. A jacking unit is provided on the cable to be replaced. When the cable is replaced, the jacking unit smoothly removes the pin on the cable to be replaced. A vertically arranged reaction beam 1 is provided on the outer side of the girder box truss 4. The bottom end of the reaction beam 1 is supported on the beam surface. The reaction beam and the jacking unit are located on both sides of the temporary sling unit. A reaction tie rod is passed through the top of the reaction beam, and the two are fixedly connected. A horizontally arranged crossbeam is provided between the reaction tie rod, the temporary sling unit and the jacking unit. The crossbeam is fixedly connected to the reaction tie rod, the temporary sling unit and the jacking unit. The reaction beam and the reaction tie rod serve as auxiliary support points for the crossbeam.

[0019] The temporary tensioning unit includes temporary tension rods 6, which are symmetrically arranged on both sides of the temporary sling 11. Temporary fork-shaped lugs 5 pass through the lower ends of the two temporary tension rods 6, and the temporary tension rods 6 and temporary fork-shaped lugs 5 are fixedly connected by connecting nuts 10. The temporary fork-shaped lugs 5 are connected to the pre-drilled holes in the box girder lugs 4 via pins. The upper ends of the temporary tension rods 6 pass through the lower anchor cup 7 of the temporary sling and the crossbeam 3, and the upper ends of the temporary tension rods 6 are fixedly connected to the crossbeam 3 by connecting nuts 10. Temporary jacks 9 and temporary support feet 8 are installed on the temporary tension rods 6 between the crossbeam 3 and the lower anchor cup 7 of the temporary sling.

[0020] The jacking unit includes a jacking reaction frame 19, which is mounted on the lower anchor cup of the sling. Jacking rods 17 are symmetrically mounted on the jacking reaction frame 19, and the lower end of the jacking rods 17 is fixedly connected to the jacking reaction frame 19. A crossbeam 3 is mounted on the upper end of the jacking rods 17, and the upper end of the jacking rods 17 is fixedly connected to the crossbeam 3. Jacking jacks 18 and jacking support feet are mounted on the jacking rods 17 between the jacking reaction frame 19 and the crossbeam 3.

[0021] Parallel wire slings are selected as temporary slings. Taking into account the effect of elastic elongation of the slings during replacement, they are applicable to the replacement of slings of different lengths and have a wide range of applications.

[0022] At auxiliary support points, such as Figure 5 As shown, the crossbeam provides downward pressure to the reaction beam, which is then transmitted to the beam surface. The crossbeam also bears the upward reaction force from the reaction beam. When replacing two slings at the same lifting point, replacing the left sling results in a larger bending moment in the crossbeam compared to replacing the right sling. Therefore, taking the replacement of the left sling as an example, the stress on the crossbeam during sling replacement is as follows: F1 + F2 = F M1=M2 Where: M1=F1*L1 M2=F2*L2 F1 is the upward reaction force of the jacking force at the lower end of the sling on the crossbeam; F2 is the upward reaction force of the reaction beam on the crossbeam; F is the downward tension force exerted by the temporary tension rod on the crossbeam; M1 is the bending moment generated at the stress point in the middle of the beam by the upward reaction force of the jacking force at the lower end of the sling on the beam. M2 is the bending moment generated at the midpoint of the crossbeam by the upward reaction force of the reaction beam on the crossbeam. L1 is the lever arm from the line of action of the upward reaction force of the jacking force at the lower end of the sling to the crossbeam to the point of force application in the middle of the crossbeam; L2 is the lever arm from the line of action of the upward reaction force of the reaction beam on the crossbeam to the point of force application at the middle of the crossbeam.

[0023] The spacing between the reaction beam and the temporary cable is equal to the spacing between the temporary cable and the cable to be replaced.

[0024] The safety factor verification results for the crossbeam are as follows: M=F1*L1 W Z =bh 2 / 6 σ max =M / W Z Safety factor = σ max / Yield strength in: M is the bending moment at the middle of the beam; W Z The flexural modulus of the beam section; σ max This represents the maximum bending normal stress of the beam. b is the width of the beam section; h is the height of the beam section.

[0025] In the design of the crossbeam, the structural form of the crossbeam was optimized to ensure that the bending strength of the crossbeam section met the requirements. By increasing the height of the middle part of the crossbeam, the crossbeam shape was made into a trapezoid. After increasing the height of the crossbeam section, the bending modulus of the section increased, ensuring that the safety factor was greater than 2.

[0026] A method for stress-induced cable replacement with a single pre-drilled hole in the under-ear plate of a suspension bridge includes the following steps: Step 1: Install the temporary sling unit; install the temporary sling clamp on the main cable, and fix the upper end of the temporary sling to the temporary sling clamp via the temporary sling upper anchor cup; the lower end of the temporary sling is anchored inside the temporary sling lower anchor cup, and temporary tension rods are symmetrically inserted through the temporary sling lower anchor cup. A forked lug plate is provided below the temporary sling lower anchor cup, and the bottom end of the temporary tension rod is fixedly connected to the forked lug plate. The forked lug plate is fixedly connected to the pre-drilled hole in the box girder lug plate via a pin. A crossbeam is provided at the top of each temporary tension rod, and the crossbeam is fixedly connected to the temporary tension rod via a connecting nut. Temporary jacks and temporary supports are respectively installed on the temporary tension rod between the temporary sling lower anchor cup and the crossbeam.

[0027] Step 2: Place the reaction beam on the outside of the box girder ear plate, ensuring the spacing between the reaction beam and the temporary cable is equal to the spacing between the temporary cable and the cable to be replaced. The bottom end of the reaction tie rod passes through the reaction beam and is fixedly connected to it. The top end of the reaction tie rod passes through the crossbeam and is fixedly connected to it. The reaction beam and reaction tie rod serve as auxiliary support points for the crossbeam.

[0028] Step 3: Install the jacking unit on the sling to be replaced; the jacking reaction frame is set on the lower anchor cup of the sling, and jacking pull rods are symmetrically inserted through the jacking reaction frame, with the lower end of the jacking pull rods fixedly connected to the jacking reaction frame; a crossbeam is inserted through the upper end of the jacking pull rod, and the upper end of the jacking pull rod is fixedly connected to the crossbeam; jacking jacks and jacking support feet are installed on the jacking pull rods between the jacking reaction frame and the crossbeam. The jacking unit jacks the sling to be replaced until the lower pin of the sling to be replaced is in a removable state, then remove the lower pin.

[0029] Step 4: Tension the temporary cable in stages, and at the same time depressurize the cable to be replaced until the cable tension of the cable to be replaced is 0. Then lift the cable to be replaced and remove the pin at the upper end of the cable to be replaced.

[0030] Step 5: Remove the slings to be replaced.

[0031] Step Six: Install the new slings, tension them in stages, and simultaneously depressurize the temporary slings until the new slings are fully tensioned; Step 7: Remove the temporary slings.

[0032] like Figure 6 , 7 As shown, the cable force conversion during cable replacement is as follows: 1. Before replacing the sling, the initial tension of the sling to be replaced is F. 初 The sum of the tensions of the two slings at the same lifting point is 2F. 初 ; 2. During the sling replacement process, the sling force to be replaced is converted through a temporary tensioning unit, and the sling force F to be replaced is... a The tension F of another sling at the same lifting point b and temporary sosoli F c The sum is 2F 初 That is, F a +F b +F c =2F 初 ; 3. After the temporary cable is installed, it should be pre-tightened and straightened. The pre-tightening force is F. 预 At this time, F c =F 预 F a +F b =2F 初 -F 预 That is, F a =F b =F 初 -F 预 / 2; 4. Push the anchor cup of the sling to be replaced out of the pin. At this time, the pushing force F1 = F 初 -F 预 / 2; 5. Temporary cables are tensioned in stages (each stage tension force is ΔF), and the cable force of the cable to be replaced is unloaded simultaneously. During this process, F c =F 预 +ΣΔF,F a =F 初 -F 预 / 2-ΣΔF,F b =F 初 -F 预 / 2; 6. Tensioning in stages until F a When F = 0, lift the removal pin of the sling to be replaced, completing the removal of the sling to be replaced. b =F 初 -F 预 / 2, F c =F 初 +F 预 / 2; 7. Install the new cable, tension the new cable in stages (each stage tension force is ΔF), and simultaneously unload the temporary cable force. During this process, the new cable force F a =ΣΔF,F b =F 初 -F 预 / 2, F c =F 初 +F 预 / 2-ΣΔF; 8. Graded tensioning until F a '=F 初 -F 预 / 2, Install the new lower pin, at this time F b =F 初 -F 预 / 2, F c =F 预 ; 9. Unload the temporary slings until F c =0, remove the temporary sling, the new sling is installed, and F is now complete. a =F b =F 初 .

[0033] This application features a reaction beam on the beam surface, which is connected to the crossbeam by a reaction tie rod, serving as a fulcrum for the jacking cable. This is applicable to both single and double ear plate holes reserved in the box girder of suspension bridges. On-site welding and fixing are not required, reducing the complexity of cable replacement.

[0034] This application employs a jacking device to push the sling to the exit pin, transferring the sling force to a temporary sling to complete the sling replacement. Throughout the entire sling replacement process, the total sling force at the sling's lifting point remains constant, without affecting the relative spatial position between the cable beams.

[0035] As one of the load-bearing components in the entire sling replacement system, the crossbeam is heightened in the middle to increase the bending modulus of the crossbeam section, making the safety factor of the crossbeam greater than 2, thus ensuring that the bending strength of the crossbeam section meets the requirements.

[0036] Taking the Jiangyin Yangtze River Bridge as an example, considering the height difference between the box girder ear plate and the beam surface, in order to ensure the stability of the reaction beam under stress, a base with a matching slope is designed according to the actual height difference. The base is fixed on the reaction beam, so that the entire base is on an inclined surface, ensuring the stability of the reaction beam supported on the maintenance passage.

[0037] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A stress-replacing cable replacement device with a single pre-drilled hole in the lower ear plate of a suspension bridge cable, characterized in that: The system includes a main cable with a permanent cable clamp. The top end of a suspender cable is connected to the permanent cable clamp. A box girder ear plate is located below the main cable, and the bottom end of the suspender cable is connected to the box girder ear plate. A pre-drilled hole is provided on the box girder ear plate. A temporary suspender cable unit is provided between the main cable and the pre-drilled hole. The temporary suspender cable unit includes a temporary suspender cable. Temporary suspender cable anchor cups are provided at both ends of the temporary suspender cable. One temporary suspender cable anchor cup is fixed to the main cable by a temporary cable clamp, and the other temporary suspender cable anchor cup is connected to the pre-drilled hole on the box girder ear plate by a temporary tensioning unit. A jacking unit is provided on the suspender cable to be replaced. A vertically arranged reaction beam is provided on the outside of the box girder ear plate. The bottom end of the reaction beam is supported on the beam surface. The reaction beam and the jacking unit are located on both sides of the temporary suspender cable unit. A reaction tie rod is passed through the top of the reaction beam and the two are fixedly connected. A horizontally arranged crossbeam is provided between the reaction tie rod, the temporary cable unit, and the jacking unit. The crossbeam is fixedly connected to the reaction tie rod, the temporary cable unit, and the jacking unit.

2. The stress-replacing cable replacement device with a single pre-drilled hole in the lower ear plate of a suspension bridge cable according to claim 1, characterized in that: The temporary tensioning unit includes a temporary tensioning rod, the lower end of which is provided with a temporary fork-shaped lug plate, which is connected to the pre-reserved hole of the box girder lug plate by a pin; the upper end of the temporary tensioning rod passes through the temporary cable anchor cup and the crossbeam, and the upper end of the temporary tensioning rod is fixedly connected to the crossbeam; a temporary jack and a temporary support foot are provided on the temporary tensioning rod between the crossbeam and the temporary cable anchor cup.

3. A stress-replacing cable replacement device with a single pre-drilled hole in the lower ear plate of a suspension bridge cable according to claim 1, characterized in that: The jacking unit includes a jacking reaction frame, which is mounted on the anchor cup under the sling. Jacking rods are symmetrically inserted through the jacking reaction frame, and the lower end of each jacking rod is fixedly connected to the jacking reaction frame. A crossbeam is inserted through the upper end of each jacking rod, and the upper end of each jacking rod is fixedly connected to the crossbeam. Jacking jacks and jacking support feet are installed on the jacking rod between the jacking reaction frame and the crossbeam.

4. A stress-replacing cable replacement device with a single pre-drilled hole in the lower ear plate of a suspension bridge cable according to claim 1, characterized in that: The height of the upper surface of the middle part of the crossbeam is higher than the height of both ends of the crossbeam.

5. A method for stress-induced cable replacement with a single pre-drilled hole in the under-ear plate of a suspension bridge according to any one of claims 1-4, characterized in that: The rope-changing method includes the following steps: Step 1: Install temporary sling units between the main cable and the reserved holes in the box girder ear plates. Step 2: Place the reaction beam on the outside of the box girder ear plate; pass the bottom end of the reaction tie rod through the reaction beam and fix it to the beam; pass the top end of the reaction tie rod through the crossbeam and fix it to the crossbeam. Step 3: Install the jacking unit on the sling to be replaced, and jack the sling to be replaced until the lower pin is removable, then remove the lower pin; Step 4: Tension the temporary cable in stages, and at the same time depressurize the cable to be replaced until the cable tension of the cable to be replaced is 0. Then lift the cable to be replaced and remove the upper pin. Step 5: Remove the slings to be replaced; Step Six: Install the new slings, tension them in stages, and simultaneously depressurize the temporary slings until the new slings are fully tensioned; Step 7: Remove the temporary slings.

6. A method for stress-induced cable replacement with a single pre-drilled hole in the under-ear plate of a suspension bridge according to claim 5, characterized in that: The distance between the reaction beam and the temporary cable is greater than or equal to the distance between the temporary cable and the cable to be replaced.

7. A method for stress-induced cable replacement with a single pre-drilled hole in the under-ear plate of a suspension bridge according to claim 5, characterized in that: The safety factor of the crossbeam is greater than 2.

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