CN-121992735-A - Cable replacement device with stress at single preformed hole of lower lug plate of suspension bridge sling and cable replacement method thereof

CN121992735ACN 121992735 ACN121992735 ACN 121992735ACN-121992735-A

Abstract

The application relates to a device and a method for replacing a single preformed hole of a lug plate under a sling of a suspension bridge with stress, and belongs to the technical field of suspension bridges. The novel cable comprises a main cable, wherein a box girder ear plate is arranged below the main cable, a reserved hole is formed in the box girder ear plate, a temporary sling unit is arranged between the main cable and the reserved hole, a pushing unit is arranged on the sling to be replaced, a vertically arranged counter-force beam is arranged outside the box girder ear plate, the bottom end of the counter-force beam is supported on a girder surface, the counter-force beam and the pushing unit are arranged on two sides of the temporary sling unit, a counter-force pull rod is arranged at the top of the counter-force beam in a penetrating mode and fixedly connected with the counter-force pull rod, 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. According to the application, the counterforce beam is arranged on the beam surface as an auxiliary supporting point, so that the replacement of the single preformed hole stress sling is realized. In the sling replacement process, the sum of the forces of three slings at the same suspension point is kept unchanged.

Inventors

JIN PING
YU YANYING
KUANG JIANGUO
CHEN JUN
ZHOU QIANGSHENG
JIANG HUA
TANG WEIXING

Assignees

江苏法尔胜缆索有限公司

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (7)

1. A stress cable replacement device for a single reserved hole of a lower lug plate of a suspension bridge sling is characterized by comprising a main cable, wherein a permanent cable clamp is arranged on the main cable, the top end of the sling is connected with the permanent cable clamp, a box girder lug plate is arranged below the main cable, the bottom end of the sling is connected with a box Liang Erban, a reserved hole is formed in the box girder lug plate, a temporary sling unit is arranged between the main cable and the reserved hole, the temporary sling unit comprises a temporary sling, temporary sling anchor cups are respectively arranged at the upper end and the lower end of the temporary sling, one temporary sling anchor cup is fixed on the main cable through the temporary cable clamp, the other temporary sling anchor cup is connected with the reserved hole in the box girder lug plate through the temporary tensioning unit, a counter-force beam which is to be replaced is arranged on the sling, counter-force beams which are vertically arranged are arranged on the outer sides of the box girder lug plate, a pull rod is arranged on the two sides of the temporary girder unit in a penetrating mode, the top of the temporary sling unit is fixedly connected with the temporary sling unit, a horizontal sling unit is arranged between the temporary sling unit and the temporary sling unit, and the counter-force beam unit is fixedly connected with the counter-force beam.
2. The single reserved hole stress cable replacement device for the lower lug plate of the suspension bridge sling is characterized in that the temporary tensioning unit comprises a temporary tensioning rod, a temporary fork-shaped lug plate is arranged at the lower end of the temporary tensioning rod and connected with the reserved hole of the box Liang Erban through a pin shaft, the upper end of the temporary tensioning rod penetrates through a temporary sling anchor cup and a cross beam, the upper end of the temporary tensioning rod is fixedly connected with the cross beam, and a temporary jack and a temporary supporting leg are arranged on the temporary tensioning rod between the cross beam and the temporary sling anchor cup.
3. The device for replacing a cable with stress in a single reserved hole of a lower lug plate of a sling of a suspension bridge according to claim 1, wherein the pushing unit comprises a pushing reaction frame, the pushing reaction frame is arranged on a lower anchor cup of the sling, pushing pull rods are symmetrically arranged on the pushing reaction frame in a penetrating mode, the lower ends of the pushing pull rods are fixedly connected with the pushing reaction frame, a cross beam is arranged at the upper ends of the pushing pull rods in a penetrating mode, the upper ends of the pushing pull rods are fixedly connected with the cross beam, and pushing jacks and pushing supporting feet are arranged on the pushing pull rods between the pushing reaction frame and the cross beam.
4. The device for replacing a cable of a suspension bridge with a single preformed hole in a lower lug plate of a sling of the suspension bridge according to claim 1, wherein the upper surface of the middle part of the cross beam is higher than the two ends of the cross beam.
5. The method for replacing the cable with stress based on the single preformed hole of the lower lug plate sling of the suspension cable bridge is characterized by comprising the following steps of: Step one: a temporary sling unit is arranged between the main cable and the reserved hole of the box girder lug plate; The reaction beam is arranged outside the box Liang Erban, and the bottom end of the reaction pull rod penetrates through the reaction beam and is fixedly connected with the reaction beam; step three, installing a pushing unit on the sling to be replaced, pushing the sling to be replaced until the lower end pin shaft reaches a detachable state, and detaching the lower end pin shaft; Step four, carrying out grading tensioning on the temporary rope, simultaneously releasing pressure of the sling to be replaced, lifting the sling to be replaced until the cable force of the sling to be replaced is 0, and removing the pin shaft at the upper end; step five, dismantling a sling to be replaced; Step six, installing a new sling, stretching the new sling in a grading way, and simultaneously releasing pressure of the temporary sling until the new sling is completely stretched; And seventhly, removing the temporary sling.
6. The method for replacing a suspension cable with a single preformed hole of an ear plate sling under a suspension cable bridge according to claim 5, wherein the distance between the counter-force beam and the temporary cable is larger than or equal to the distance between the temporary cable and the sling to be replaced.
7. The method for replacing a cable with stress on a single reserved hole of a suspension cable bridge lower lug plate sling according to claim 5, wherein the safety coefficient of the cross beam is larger than 2.

Description

Cable replacement device with stress at single preformed hole of lower lug plate of suspension bridge sling and cable replacement method thereof Technical Field The invention relates to a device and a method for replacing a single preformed hole of a lug plate under a sling of a suspension bridge with stress, and belongs to the technical field of suspension bridges. Background The sling is used as a main force transmission component of a suspension bridge, and is subjected to dynamic actions such as vehicle load, wind and rain vibration and the like for a long time, and along with the increase of the operation time of the bridge, the sling steel wire can be subjected to fatigue damage due to the action of cyclic load. Meanwhile, the sling is affected by the structural design of the sling, the damage of the PE sheath, the failure of the waterproof system and the like, so that the steel wire is corroded or broken. In addition, the sling may have accidents such as vehicle collision, fire damage and the like, and the steel wire is damaged. When the sling performance cannot meet the design use requirements, the sling must be replaced. The suspension bridge is generally reserved with 1-2 lug holes, the suspension bridge box girder is usually replaced by installing auxiliary ropes on the reserved lug holes, and the cable force conversion is completed by synchronously unloading the cable force of the suspension bridge to be replaced by stretching the auxiliary ropes. The patent number CN210134348U discloses a sling replacement method suitable for a suspension bridge box girder lug plate with only one reserved lug plate hole. According to the method, temporary slings are respectively arranged at the replacement hanging point and a plurality of hanging points adjacent to the replacement hanging point, the rope force of the replacement slings is shared through the temporary slings, the load of a single temporary sling is reduced, and the construction risk of sling replacement is reduced. The method is high in safety, but the construction operation surface is more, the occupied road construction time is long, the cost is high, meanwhile, when the sling wire is replaced without stress, the vertical line shape of the steel box girder is gradually changed, the whole lifting points are lifted, and the relative displacement exists between the cable girders. The patent number CN509584874U discloses a suspension bridge sling replacement device, which is characterized in that a temporary riding type rope clamp is arranged above a to-be-replaced sling clamp, the temporary sling rides on the temporary rope clamp and extends downwards to be connected with a shoulder pole beam, a fork lug plate and a tension rod are arranged at a reserved lug plate hole, and the tension rod is connected with the shoulder pole beam. Fork-shaped lug plates and tension rods are arranged on the holes of the suspension cable reserved lug plates of the adjacent suspension points and are also connected with the shoulder pole beams, and two reaction frames are connected between the two shoulder pole beams. And a tensioning shoulder pole beam is arranged above the anchor cup of the sling to be replaced, and a back counter-force beam is arranged above the tensioning shoulder pole beam to be connected with the jack. Compared with a multi-hanging-point temporary sling tensioning system, the replacing method has the advantages that the working face, the occupied construction time and the cost are reduced. However, in the sling replacement process, as the shoulder pole beam is arranged above the reaction frame, when the temporary sling is tensioned, acting force exists between the shoulder pole beam and the reaction frame, the jacking force of the sling to be replaced is affected when the temporary sling is tensioned, the difficulty in controlling the cable force is increased, and relative displacement exists between the cable beams. Disclosure of Invention The invention aims to solve the technical problem of providing a single preformed hole stress cable replacing device and a cable replacing method for a lower lug plate single preformed hole of a suspension bridge cable, and the single preformed hole stress cable replacing is realized by arranging a counter-force beam on a beam surface as an auxiliary supporting point. In the sling replacement process, the sum of the sling forces of three slings at the same suspension point is kept unchanged, and the relative spatial position between the cable beams is not influenced. The technical scheme includes that the single reserved hole of the lower lug plate of the suspension bridge sling is provided with a stress cable replacement device, the stress cable replacement device comprises a main cable, a permanent cable clamp is arranged on the main cable, the top end of the sling is connected with the permanent cable clamp, a box girder ear plate is arranged below the main cable, the bottom end of the sling is connected