CN112144423B - Method for loosening and dismantling stay cable - Google Patents
Method for loosening and dismantling stay cable Download PDFInfo
- Publication number
- CN112144423B CN112144423B CN202011011228.2A CN202011011228A CN112144423B CN 112144423 B CN112144423 B CN 112144423B CN 202011011228 A CN202011011228 A CN 202011011228A CN 112144423 B CN112144423 B CN 112144423B
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- CN
- China
- Prior art keywords
- cable
- stay
- stay cable
- tower
- anchor head
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
Abstract
The invention aims to provide a method for conveniently and safely dismantling a stay cable, which comprises the following steps: the method comprises the following steps: the tower end is provided with a reducing nut and a tension rod, and then a supporting leg, a penetrating jack and a nut are sequentially arranged; step two: tensioning the stay cable by using a jack; step three: mounting cable clamps on the stay cables at the tower ends, continuously loosening the stay cables through the tower top crane, and lowering the anchor heads at the tower ends to the bridge floor after the stay cables are completely loosened; step four: when the beam end anchor head is dismantled, the stay cable is lifted by a bridge deck forklift or truck crane, then the beam end anchor head is loosened, a nut on the beam end anchor head is dismantled, and the beam end anchor head is hoisted out by the forklift or truck crane to be placed on the bridge deck; step five: the stayed-cable is removed from the bridge floor for straightening and cutting; step six: and transferring the stay cable to a specified position for stacking. When the technical scheme is adopted, the stay cable can be conveniently and safely detached.
Description
Technical Field
The invention relates to the field of stay cable dismantling, in particular to a method for loosening and dismantling a stay cable.
Background
In the process of replacing or dismantling the stay cable, the anchor head at the tower end is usually dismantled first, and then the anchor head at the upper beam end of the bridge is dismantled; because the concrete is poured into the anchor head anchored at the tower end, the anchor head is difficult to normally withdraw. If the stay cable is directly cut under the condition without protection, great impact force can be generated when the stay cable is cut off, damage can be caused to the bridge deck, and serious safety accidents can be caused seriously.
Disclosure of Invention
The invention aims to provide a method for conveniently and safely dismantling a stay cable.
In order to achieve the above purpose, the technical scheme of the invention provides a method for loosening and dismantling a stay cable, which comprises the following steps:
the method comprises the following steps: the tower end is provided with a reducing nut and a tension rod, and then a supporting leg, a penetrating jack and a nut are sequentially arranged;
step two: tensioning the stay cable by using a jack;
step three: installing a cable clamp on the stay cable at the tower end, continuously loosening the stay cable through the tower top crane, and lowering the anchor head at the tower end to the bridge floor after the stay cable is completely loosened;
step four: when the beam end anchor head is dismantled, the stay cable is lifted by a bridge deck forklift or truck crane, then the beam end anchor head is loosened, a nut on the beam end anchor head is dismantled, and the beam end anchor head is hoisted out by the forklift or truck crane to be placed on the bridge deck;
step five: the stayed-cable is removed from the bridge floor for straightening and cutting;
step six: and transferring the stay cable to a specified position for stacking.
The technical effect of the scheme is as follows: when the anchor head of the tower end is dismantled, the anchor head of the tower end can be safely lowered onto the bridge floor through the matching of the reducing nut, the tension rod, the supporting feet, the jack, the nut and the cable clamp, and the bridge floor cannot be damaged and safety accidents cannot be caused.
Further, the stroke of the jack in the second step is relaxed to 200mm each time. The technical effect of the scheme is as follows: the shaking generated by the stay cable in the tension releasing process can be reduced.
Furthermore, in the second step, the cable force of less than 20t is used as the basis for releasing the cable end at the tower end. The technical effect of the scheme is as follows: the method is favorable for judging that the stay cable is loose enough.
And further, in the second step, when the length of the tension rod is not enough, the tension rod is lengthened to perform stay cable tensioning. The technical effect of the scheme is as follows: ensuring that the stay cable does not generate very large impact force.
And further, in the fourth step, the anchor head at the beam end is loosened by pulling the chain block. The technical effect of the scheme is as follows: can comparatively easily draw loose beam-ends anchor head.
And furthermore, the length of each stay cable section cut in the fifth step is 6-7 m. The technical effect of the scheme is as follows: can improve cutting efficiency when satisfying the loading.
Furthermore, the cable clamp in the third step comprises an n-shaped buckle, an H-shaped support plate and an L-shaped locking piece, and the buckle is connected with the tower top crane; the one end of backup pad is rotated with the one end of buckle and is connected, the other end sliding connection of locking piece and backup pad, and the other end of buckle is equipped with the locking hole, and the locking piece can insert in the locking hole. The technical effect of the scheme is as follows: after the cable clamp is used for fixing the stay cables, the tower top crane is beneficial to keeping the tower top crane away from other stay cables when the detached stay cables are hoisted, and other stay cables are prevented from being damaged or broken when the tower top crane collides with other stay cables.
When adopting this cable clamp to fix the suspension cable, direct rotation backup pad grips the locking piece and inserts it in the locking hole and can accomplish the cable clamp and fix the suspension cable, and is very convenient, is favorable to improving the efficiency of demolising of suspension cable.
In addition, the locking piece can support the stay cable, the bending degree of the stay cable at the anchor head end of the tower can be reduced under the condition that the tower top crane is far away from other stay cables, namely the tower top crane is far away from the anchor head at the tower end of the stay cable for dismounting, namely the working difficulty and the working time for straightening the stay cable in the fifth step can be reduced, the stay cable can be quickly straightened and cut, the clearing time after the stay cable is dismounted is favorably reduced, and the traffic can be conveniently recovered to pass as soon as possible.
Furthermore, the locking piece comprises a horizontal part and a vertical part, and the vertical part is in a convex shape. The technical effect of the scheme is as follows: when the horizontal part supports the stay cable, the locking piece is ensured not to rotate.
Further, the horizontal part is in a shape of a round bar. The technical effect of the scheme is as follows: the abrasion of the horizontal part to the stay cable is reduced.
Furthermore, a clamping block is fixed at the free end of the vertical part, and the clamping block is matched with the locking hole in size. The technical effect of the scheme is as follows: the locking piece is prevented from falling off from the supporting plate.
Drawings
FIG. 1 is a schematic diagram of an installation apparatus in step one according to an embodiment of the present invention;
FIG. 2 is a three-dimensional view of a cord clip according to a second embodiment of the present invention;
fig. 3 is a schematic view illustrating a bending state of the stay cable.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: reducing nut 1, stretch-draw pole 2, spike 3, punching jack 4, cable clamp 5, buckle 6, backup pad 7, horizontal part 8, vertical part 9.
The first embodiment is as follows:
a method for loosening and dismantling a stay cable comprises the following steps:
the method comprises the following steps: a reducing nut 1 and a tension rod 2 shown in figure 1 are arranged at the tower end until the inner thread of an anchor head (or an anchor cup) is fully threaded, and then a supporting leg 3, a penetrating jack 4 and a tension rod nut are sequentially arranged.
Step two: and (3) releasing and tensioning the inclined pull cable by using a jack, releasing 200mm according to the stroke of the jack every time, taking the cable force less than 20t as the basis for ending the cable release at the tower end, and lengthening the tension rod 2 to release and tension the inclined pull cable when the length of the tension rod 2 is not enough.
Step three: and a cable clamp 5 is arranged on the cable at the tower end, the cable clamp 5 can be a cable clamp 5 with the model number of DIN1142, the stay cable is continuously loosened through the tower top crane until the stay cable is completely loosened, the anchor head at the beam end is not stressed any more, and finally the anchor head at the tower end is lowered to the bridge floor.
Step four: when the beam end anchor head is dismantled, the stay cable is lifted by a bridge deck forklift or a truck crane, then the beam end is pulled loose by a chain block, the anchor head nut is dismantled, and the beam end anchor head is hoisted out by the forklift or the truck crane and placed on the bridge deck.
Step five: and (4) removing the guy cable on the bridge surface, and straightening and cutting each section by 6-7 m.
Step six: and transferring the stay cable to a specified position for stacking.
Example two:
different from the first embodiment, the cable clamp 5 in the third step is shown in fig. 2, and comprises a buckle 6 in an n shape, a support plate 7 in an H shape and a locking piece in an L shape, wherein the top of the buckle 6 is fixedly connected with a steel wire rope of the tower crane.
The left end of the supporting plate 7 is rotationally connected with the left end of the buckle 6 through a pin shaft; the locking piece includes horizontal part 8 and vertical portion 9, and horizontal part 8 and vertical portion 9 weld in an organic whole, and vertical portion 9 is "protruding" font, and horizontal part 8 is round rod-shaped.
The right end of the supporting plate 7 is provided with a convex slideway, and the vertical part 9 slideway is arranged in the slideway; the right end of the buckle 6 is also provided with a convex locking hole, and the vertical part 9 can be inserted into the locking hole.
After the stay cables are fixed by the cable clamps 5 shown in fig. 2, when the tower top crane hoists the disassembled stay cables, the tower top crane is beneficial to keeping away from other stay cables, and other stay cables are prevented from being damaged or broken when the tower top crane collides with other stay cables.
When the stay cable is fixed by the cable clamp 5, the support plate 7 is directly rotated, the horizontal part 8 is held and inserted into the locking hole, and then the cable clamp 5 can be fixed to the stay cable, so that the cable clamp is very convenient and the efficiency of dismantling the stay cable is improved.
In addition, as shown in fig. 3, the vertical portion 9 can support the stay cables, and when the tower top crane is far away from other stay cables, that is, when the tower top crane is far away from the tower end anchor head of the stay cable being dismantled (the tower end anchor head is heavy), the bending degree of the stay cable at the tower end anchor head can be reduced, the work difficulty and the work time for straightening the stay cable in the fifth step can be reduced, that is, the stay cable can be quickly straightened and cut, the clearing time after the stay cable is dismantled can be reduced, and the traffic can be quickly recovered.
Example three:
different from the second embodiment, in order to prevent the vertical portion 9 from falling off from the right end of the support plate 7, a clamping block in a shape like a Chinese character 'tu' is welded at the free end of the vertical portion 9, the size of the clamping block is larger than that of the vertical portion 9, and the clamping block and the locking hole are the same in size.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.
Claims (6)
1. A method for loosening and dismantling a stay cable is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the tower end is provided with a reducing nut and a tension rod, and then a supporting leg, a penetrating jack and a nut are sequentially arranged;
step two: tensioning the stay cable by a jack;
step three: mounting cable clamps on the stay cables at the tower ends, continuously loosening the stay cables through the tower top crane, and lowering the anchor heads at the tower ends to the bridge floor after the stay cables are completely loosened; the cable clamp comprises an n-shaped buckle, an H-shaped support plate and an L-shaped locking piece, and the buckle is connected with the tower crane; one end of the support plate is rotatably connected with one end of the buckle, the locking piece is slidably connected with the other end of the support plate, a locking hole is formed in the other end of the buckle, and the locking piece can be inserted into the locking hole; the locking piece comprises a horizontal part and a vertical part, and the vertical part is in a convex shape; the horizontal part is in a round rod shape; a clamping block is fixed at the free end of the vertical part, and the clamping block is matched with the locking hole in size; when the cable clamp is used for fixing the stay cable, the support plate is directly rotated, and the horizontal part is held and inserted into the locking hole, so that the stay cable can be fixed by the cable clamp;
step four: when the beam end anchor head is dismantled, the stay cable is lifted by a bridge deck forklift or truck crane, then the beam end anchor head is loosened, a nut on the beam end anchor head is dismantled, and the beam end anchor head is hoisted out by the forklift or truck crane to be placed on the bridge deck;
step five: the stayed-cable is removed from the bridge floor for straightening and cutting;
step six: and transferring the stay cable to a specified position for stacking.
2. The method for loosening and dismantling a stay cable according to claim 1, wherein: step two, the stroke of the jack is relaxed to 200mm each time.
3. The method for loosening and dismantling a stay cable according to claim 2, wherein: and in the second step, the cable force of less than 20t is taken as the basis for releasing cable end at the tower end.
4. The method for loosening and dismantling a stay cable according to claim 3, wherein: and step two, when the length of the tension rod is not enough, the tension rod is lengthened to perform stay cable tension releasing.
5. The method for loosening and dismantling a stay cable according to claim 4, wherein: in the fourth step, the anchor head at the beam end is loosened by pulling the chain block.
6. The method for loosening and dismantling a stay cable according to claim 5, wherein: and fifthly, the length of each stay cable after cutting is 6-7 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011011228.2A CN112144423B (en) | 2020-09-23 | 2020-09-23 | Method for loosening and dismantling stay cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011011228.2A CN112144423B (en) | 2020-09-23 | 2020-09-23 | Method for loosening and dismantling stay cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112144423A CN112144423A (en) | 2020-12-29 |
| CN112144423B true CN112144423B (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011011228.2A Active CN112144423B (en) | 2020-09-23 | 2020-09-23 | Method for loosening and dismantling stay cable |
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| CN (1) | CN112144423B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509231A (en) * | 2009-03-26 | 2009-08-19 | 周孝余 | Construction method for quickly assembling and disassembling guy cable of stayed-cable bridge |
| CN203475318U (en) * | 2013-08-12 | 2014-03-12 | 中交第二航务工程局有限公司 | Cable-clamp-free hanging appliance used for anchoring stay cable at tower end in cable bent tower steel anchor beam area |
| CN107419667A (en) * | 2017-08-16 | 2017-12-01 | 中国十七冶集团有限公司 | A kind of self-anchored suspension bridge installing Cable-clamp method |
| CN107724256A (en) * | 2017-10-30 | 2018-02-23 | 重庆城建控股(集团)有限责任公司 | Suspension cable changes rope technique |
| CN208917694U (en) * | 2018-08-16 | 2019-05-31 | 广东省长大公路工程有限公司 | A kind of preload cable device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2744467B1 (en) * | 1996-02-06 | 1998-04-03 | Freyssinet Int Stup | SUSPENSION DEVICE FOR CIVIL ENGINEERING STRUCTURE AND CONSTRUCTION METHOD |
-
2020
- 2020-09-23 CN CN202011011228.2A patent/CN112144423B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101509231A (en) * | 2009-03-26 | 2009-08-19 | 周孝余 | Construction method for quickly assembling and disassembling guy cable of stayed-cable bridge |
| CN203475318U (en) * | 2013-08-12 | 2014-03-12 | 中交第二航务工程局有限公司 | Cable-clamp-free hanging appliance used for anchoring stay cable at tower end in cable bent tower steel anchor beam area |
| CN107419667A (en) * | 2017-08-16 | 2017-12-01 | 中国十七冶集团有限公司 | A kind of self-anchored suspension bridge installing Cable-clamp method |
| CN107724256A (en) * | 2017-10-30 | 2018-02-23 | 重庆城建控股(集团)有限责任公司 | Suspension cable changes rope technique |
| CN208917694U (en) * | 2018-08-16 | 2019-05-31 | 广东省长大公路工程有限公司 | A kind of preload cable device |
Non-Patent Citations (2)
| Title |
|---|
| 不中断交通条件下斜拉索更换施工关键技术;吴俊明等;《交通科技》;20150831(第4期);第94页 * |
| 吴俊明等.不中断交通条件下斜拉索更换施工关键技术.《交通科技》.2015,(第4期),第94页. * |
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| CN112144423A (en) | 2020-12-29 |
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