CN111155415A - Stay cable lower anchor head dehumidification structure - Google Patents
Stay cable lower anchor head dehumidification structure Download PDFInfo
- Publication number
- CN111155415A CN111155415A CN202010067361.3A CN202010067361A CN111155415A CN 111155415 A CN111155415 A CN 111155415A CN 202010067361 A CN202010067361 A CN 202010067361A CN 111155415 A CN111155415 A CN 111155415A
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- air
- pipe
- cable
- cable guide
- guide pipe
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a dehumidifying structure for a lower anchor head of a stay cable, which comprises a fixed end anchorage device, an anchor backing plate and a plurality of steel stranded wires, wherein the steel stranded wires are arranged on the fixed end anchorage device, the fixed end anchorage device is positioned in the anchor backing plate, one end of a cable guide pipe is hermetically connected with the anchor backing plate, the other end of the cable guide pipe realizes internal sealing through a sealing element, the fixed end anchorage device and the steel stranded wires are partially accommodated in the cable guide pipe, the steel stranded wires penetrate through the sealing element and extend out of the cable guide pipe, an air pipe structure is pre-embedded in the fixed end anchorage device and inputs dry air into the cable guide pipe, the dry air is mixed with the original air in the cable guide pipe and flows, and then the dry air returns to an inner cavity of an outer protective cover from a gap between the pre-embedded air pipe structure and the fixed end anchorage device and the cable guide pipe to, the gas has shorter path, relatively less energy loss and lower requirement on air supply equipment.
Description
Technical Field
The invention relates to a stay cable, in particular to a dehumidifying structure for an anchor head under the stay cable.
Background
The cable-stayed bridge, also called a tension bridge, has large span and beautiful shape, and is a bridge type widely applied at present. The stay cable is a main bearing force transmission structural component of the cable-stayed bridge and mainly comprises a high-strength steel wire and an anchoring device. Because the steel wire and the anchor cable structural member are placed in adverse external conditions of rivers, lakes and seas for a long time, the steel wire and the anchor cable structural member are extremely easy to corrode, and the attractiveness and the service life of the bridge are seriously affected. Therefore, the corrosion prevention of the stay cable is an important component in bridge engineering. Although a plurality of anticorrosion measures are adopted in engineering, the effect is obvious, but the corrosion condition of the lower anchor head of the stay cable is still very serious.
In order to prevent corrosion of the stay cables, the structure of the stay cables has been modified several times, for example, the stay cables described in the patent application No. CN201810653704.7 and the patent application No. CN 201910639676.8. The two improved schemes for the structure of the stay cable body are both designed according to the integral dehumidification angle that the dry air is sent to the anchor head on the stay cable from the anchor head under the stay cable through the gap between the stay cable body and the protective sleeve. However, the corrosion prevention of the lower anchor head is the key point of the corrosion prevention of the stay cable from the viewpoint of the corrosion prevention of the whole stay cable.
The problem of the stay cable in patent application No. CN201810653704.7 is: because the anchoring devices at the two ends of the stay cable, the anchor backing plate, the bolts for connection and the like are all made of metal materials, if the stay cable is extremely easy to corrode in a humid environment for a long time, in the steel strand stay cable, the anchoring devices are exposed out of the stay cable body, so that the anchoring devices still have the problem of easy corrosion, the anchoring devices realize the key parts for fixedly connecting the stay cable body with the bridge floor and the tower, and the anchoring devices are easy to corrode, so that the problem of unstable connection between the stay cable body and the bridge floor and the tower is easily caused.
The problem of the stay cable in patent application No. CN201910639676.8 is: the sealing of a plurality of positions of the stay cable is required, certain difficulty is brought to the stability of the sealing, and particularly the sealing of a gap between an outer sheath pipe of a steel strand and a tower end PE pipe connecting device is realized. In addition, the stay cables are generally long, and there are large on-way resistance and energy loss when air is fed from the lower anchor head of the stay cable and air is discharged from the upper anchor head of the stay cable, which makes high demands on the air supply equipment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the dehumidifying structure for the lower anchor head of the stay cable, which can prevent corrosion of the stay cable and the lower anchor head, has a simple structure, is easy to realize sealing at each position, saves energy and has low requirements on equipment.
The purpose of the invention is realized by adopting the following technical scheme:
a dehumidifying structure for anchor head under stay cable comprises a fixed end anchor, an anchor backing plate and a plurality of steel strands, wherein the steel strands are installed on the fixed end anchor, the fixed end anchor is positioned in the anchor backing plate, the dehumidifying structure for anchor head under stay cable further comprises a cable guide pipe, a sealing piece and a wind pipe structure, one end of the cable guide pipe is in sealing connection with the anchor backing plate, the other end of the cable guide pipe is internally sealed through the sealing piece, the fixed end anchor and the steel strands are partially contained in the cable guide pipe, the steel strands penetrate through the sealing piece and stretch out from the cable guide pipe, the wind pipe structure is pre-buried in the fixed end anchor and inputs dry air into the cable guide pipe, the dry air and the original air in the cable guide pipe are mixed and flow and then return to an inner cavity of an outer protective cover from a gap between the pre-buried wind pipe structure and the fixed end, and reducing the internal environment humidity, thereby performing anticorrosion protection on the fixed end anchorage device and the exposed part of the steel strand.
Furthermore, the anchor backing plate is provided with an air hole, the interior of the cable guide pipe is communicated with the exterior of the cable guide pipe through the air hole, a gap is formed between the fixed end anchorage device and the cable guide pipe, and backflow air flows out of the cable guide pipe through the air hole through the gap.
Furthermore, anchor head dehumidification structure includes the tuber pipe structure under the suspension cable, the tuber pipe structure includes the return air pipe, the return air pipe is pre-buried to be located the stiff end ground tackle, the dry air of backward flow is followed the return air pipe flows out the cable pipe.
Furthermore, the air pipe structure further comprises an air supply pipe, wherein the air supply pipe is pre-buried in the fixed end anchorage device and conveys dry air to the inside of the cable guide pipe.
Further, anchor head dehumidification structure still includes interior safety cover under the suspension cable, the stiff end ground tackle with interior safety cover is connected, steel strand wires tip accept in interior safety cover.
Furthermore, two through holes are formed in the end portion of the inner protection cover, one end of the air return pipe and one end of the air supply pipe penetrate through the through holes, and the other end of the air return pipe and the other end of the air supply pipe extend into the cable guide pipe.
Further, anchor head dehumidification structure still includes outer safety cover under the suspension cable, outer safety cover with anchor backing plate sealing connection, interior safety cover is located in the outer safety cover.
Further, outer safety cover is equipped with the exhaust hole, outer safety cover with there is the space between the interior safety cover, the anchor backing plate is equipped with the gas pocket, the cable pipe is inside to be passed through the gas pocket with the outside intercommunication of cable pipe, the stiff end ground tackle with there is the clearance between the cable pipe, and the dry air of backward flow is followed through the clearance the gas pocket flows out the cable pipe, the warp the space flows to exhaust hole is discharged.
Furthermore, the air pipe structure further comprises an air supply hose, the outer protective cover is provided with an air inlet, one end of the air supply hose is communicated with the air inlet, and the other end of the air supply hose is communicated with the air supply pipe.
Furthermore, the stay cable lower anchor head dehumidification structure further comprises a shock absorber, the sealing elements are rubber sheets, the number of the sealing elements is two, the two rubber sheets are respectively located on two sides of the shock absorber, the outer edge of each rubber sheet is sealed with the inner wall of the cable guide pipe, the inner edge of each rubber sheet is sealed with the outer wall of the steel strand, and the steel strand penetrates through the rubber sheets and the shock absorber.
Compared with the prior art, the stay cable lower anchor head dehumidifying structure comprises a steel strand which is arranged on a fixed end anchor, the fixed end anchor is positioned in an anchor backing plate, the stay cable lower anchor head dehumidifying structure also comprises a cable guide pipe, a sealing element and an air pipe structure, one end of the cable guide pipe is connected with the anchor backing plate in a sealing way, the other end of the cable guide pipe realizes internal sealing through the sealing element, the fixed end anchor and the steel strand are partially contained in the cable guide pipe, the steel strand penetrates through the sealing element and extends out of the cable guide pipe, the air pipe structure is pre-embedded in the fixed end anchor and inputs dry air into the cable guide pipe, and the dry, the fixed end anchorage device and the exposed part of the steel strand are dried and then flow out of the cable guide pipe, through the design, dry air enters from the air inlet of the lower anchor head and then is discharged from the exhaust hole of the lower anchor head, the path of the gas is short, the energy loss is relatively less, and the requirement on air supply equipment is lower.
Drawings
FIG. 1 is a schematic structural view of a dehumidifying structure for anchor heads under stay cables according to the present invention;
FIG. 2 is a schematic view of an airflow dehumidification of the lower anchor head dehumidification structure of the stay cable of FIG. 1;
FIG. 3 is a schematic structural view of an outer protective cover of the dehumidifying structure of the stay cable lower anchor head of FIG. 1;
fig. 4 is a schematic structural view of an inner protective cover of the stay cable lower anchor head dehumidifying structure of fig. 1.
In the figure: 10. an outer protective cover; 11. an air inlet; 12. an exhaust hole; 13. an air supply pipe connecting piece; 14. an exhaust pipe connecting piece; 21. a fixed end; 22. an anchor backing plate; 30. an air cavity; 40. a cable guide tube; 50. steel strand wires; 60. an inner protective cover; 61. a through hole; 70. a seal member; 80. a shock absorber; 90. an air duct structure; 91. an air supply hose; 92. an air supply pipe; 93. and a return air pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, 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 belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 4, the dehumidifying structure for lower anchor head of stay cable according to the present invention includes an outer protective cover 10, a fixed-end anchorage 21, an anchor backing plate 22, a cable guide 40, a steel strand 50, an inner protective cover 60, a sealing member 70, a damper 80, and a duct structure 90.
The outer protective cover 10 is provided with an air inlet hole 11, an air outlet hole 12, a blast pipe connector 13, and a blast pipe connector 14. The air inlet 11 and the air outlet 12 are located at the end of the outer protection cover 10 and on the same side. The air supply pipe connecting piece 13 is a steel pipe with external threads and can be connected with an air supply pipe matched with dehumidification equipment. The air supply pipe connecting piece 13 is welded on the air inlet hole 11 and used for conveying dry air for the stay cable lower anchor head dehumidifying structure. The exhaust pipe connecting piece 14 is a special pipe fitting, and the exhaust pipe connecting piece 14 can be connected with a temperature and humidity sensor and a silica gel constant pressure valve. The exhaust pipe connection member 14 is welded to the exhaust hole 12.
The fixed end anchorage 21 is provided with two mounting holes on the basis of the original hole system, and the diameter of each mounting hole is 10-12 mm. One mounting hole is used for pre-burying the blast pipe 92, and the other mounting hole is used for pre-burying the return air pipe 93. The anchor backing plate 22 is provided with air holes.
The inner protecting cover 60 is provided with two through holes 61, and the two through holes 61 are located at the end of the inner protecting cover 60 and at the same side of the inner protecting cover 60. One through hole 61 is determined according to the position of the pre-buried blast pipe 92, and the inner diameter of the through hole is slightly larger than the outer diameter of the blast pipe 92; the other through hole 61 is determined according to the position of the pre-buried air return pipe 93, and the inner diameter of the through hole is slightly larger than that of the air return pipe 93.
The number of the sealing members 70 is two. The seal 70 is a rubber sheet in this embodiment. The thickness of the rubber sheet is 1.5mm-2 mm. The outer diameter of the seal 70 is 5mm larger than the inner diameter of the cable guide 40. The sealing element 70 is pre-processed with corresponding hole sites according to the straightened position of the steel strand 50, and the diameter size of the hole is 1mm smaller than that of the steel strand 50.
The duct structure 90 includes an air supply hose 91, an air supply duct 92, and a return duct 93. The length of the air supply hose 91 is slightly longer than that of the outer protective cover 10. The inner diameters of the blast pipe 92 and the return air pipe 93 are 8mm-10 mm.
When the dehumidifying structure for the lower anchor head of the stay cable is assembled, one end of the steel strand 50 is fixedly installed on the fixed-end anchorage 21. The blast pipe 92 and the return air pipe 93 are pre-embedded on two mounting holes of the fixed end anchorage 21. In this case, the blower duct 92 and the return duct 93 are parallel to each other. The inner protective cover 60 is hermetically connected to the fixed end anchorage 21, and the end portions of the blast pipe 92 and the return pipe 93 extend from the through hole 61. The fixed end anchorage 21 and the steel strand 50 are now partially received in the inner protective cover 60. The outer protective cover 10 is sealingly connected to the anchor backing plate 22. The inner protective cover 60 is located inside the outer protective cover 10. The diameter of the outer protective cover 10 is larger than that of the inner protective cover 60, a gap exists between the outer protective cover 10 and the inner protective cover 60, and an air cavity 30 is formed between the inner protective cover 60 and the outer protective cover 10. The air cavity 30 communicates with the cable guide 40 through air holes in the anchor pad 22. When the steel strand 50 is threaded, the two sealing elements 70 are threaded together according to the corresponding sequence of hole positions, after all the steel strands 50 are threaded, the two sealing elements 70 are moved to proper positions, the two sealing elements 70 are separated, the shock absorber 80 is sleeved into the steel strand 50, and then the shock absorber is pressed into the rope guide tube 40. The cable guide tube 40 is hermetically fixed on the anchor backing plate 22, and a gap exists between the cable guide tube 40 and the fixed-end anchorage 21. The cable guide 40 communicates with the air cavity 30 through the air holes in the anchor pad 22.
When the dehumidifying structure for the anchor head under the stay cable is used, the processed dry air enters through the air inlet hole 11 of the outer protective cover 10, enters into the cable guide tube 40 through the air supply hose 91 and the air supply tube 92, is mixed with the humid air inside the cable guide tube 40, and flows back after encountering the sealing element 70, part of the mixed air flows back to the air cavity 30 through the air return pipe 93, and the other part of the mixed air flows back to the air cavity 30 through the gap between the cable guide tube 40 and the fixed end anchorage 21, the air hole of the anchor backing plate 22 and the gap between the outer protective cover 10 and the inner protective cover 60. And then discharged from the discharge hole 12. And the internal environment humidity is reduced, so that the exposed parts of the fixed end anchorage 21 and the steel strand 50 are protected from corrosion.
In the present embodiment, since the gap between the fixed end anchor 21 and the cable guide 40 is small, delay resistance is large when exhausting, and therefore, the return duct 93 is provided.
Through the design, dry air enters from the lower anchor head air inlet hole 11 and then is discharged from the lower anchor head air outlet hole 12, the path of the air is short, the energy loss is relatively less, and the requirement on air supply equipment is lower.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides an anchor head dehumidification structure under suspension cable, includes stiff end ground tackle, anchor backing plate and a plurality of steel strand wires, its characterized in that: the steel strands are arranged on the fixed-end anchorage device, the fixed-end anchorage device is positioned in the anchor backing plate, the lower anchor head dehumidifying structure for the stay cable further comprises a cable guide pipe, a sealing element and an air pipe structure, wherein one end of the cable guide pipe is connected with the anchor backing plate in a sealing manner, the other end of the cable guide pipe realizes internal sealing through the sealing element, the fixed end anchorage and the steel strand part are accommodated in the cable guide pipe, the steel strand penetrates through the sealing element and extends out of the cable guide pipe, the air pipe structure is pre-buried in the fixed end anchorage device, dry air is input into the cable guide pipe, the dry air and the original air in the cable guide pipe flow in a mixed mode and then return to the inner cavity of the outer protective cover from the pre-buried air pipe structure and the gap between the fixed end anchorage device and the cable guide pipe, internal environment humidity is reduced, and therefore corrosion prevention protection is conducted on the fixed end anchorage device and the exposed part of the steel strand.
2. The stay cable lower anchor head dehumidifying structure according to claim 1, wherein: the anchor backing plate is provided with an air hole, the interior of the cable guide pipe is communicated with the exterior of the cable guide pipe through the air hole, a gap exists between the fixed end anchorage device and the cable guide pipe, and backflow air flows out of the cable guide pipe through the air hole through the gap.
3. The stay cable lower anchor head dehumidifying structure according to claim 1, wherein: the lower anchor head dehumidifying structure of the stay cable comprises an air pipe structure, the air pipe structure comprises an air return pipe, the air return pipe is pre-buried in the fixed end anchorage device, and the returned dry air flows out of the air return pipe to form the cable guide pipe.
4. A dehumidifying structure for a stay cable lower anchor head according to claim 3, wherein: the air pipe structure further comprises an air supply pipe, the air supply pipe is pre-buried in the fixed end anchorage device, and the air supply pipe conveys dry air to the inside of the cable guide pipe.
5. The stay cable lower anchor head dehumidifying structure according to claim 4, wherein: the lower anchor head dehumidifying structure of the stay cable further comprises an inner protective cover, the fixed end anchor is connected with the inner protective cover, and the end part of the steel strand is contained in the inner protective cover.
6. The stay cable lower anchor head dehumidifying structure according to claim 5, wherein: the end part of the inner protection cover is provided with two through holes, one end of the return air pipe and one end of the blast pipe penetrate through the through holes, and the other end of the return air pipe extends into the cable guide pipe.
7. The stay cable lower anchor head dehumidifying structure according to claim 5, wherein: anchor head dehumidification structure still includes outer safety cover under the suspension cable, outer safety cover with anchor backing plate sealing connection, interior safety cover is located in the outer safety cover.
8. The stay cable lower anchor head dehumidifying structure according to claim 7, wherein: the outer safety cover is equipped with the exhaust hole, the outer safety cover with there is the space between the interior safety cover, the anchor backing plate is equipped with the gas pocket, the inside air pocket that passes through of cable pipe with the outside intercommunication of cable pipe, the stiff end ground tackle with there is the clearance between the cable pipe, and the dry air of backward flow is followed through the clearance the gas pocket flows out cable pipe, warp the space flows extremely exhaust hole is discharged.
9. The stay cable lower anchor head dehumidifying structure according to claim 7, wherein: the air pipe structure further comprises an air supply hose, the outer protective cover is provided with an air inlet, one end of the air supply hose is communicated with the air inlet, and the other end of the air supply hose is communicated with the air supply pipe.
10. The stay cable lower anchor head dehumidifying structure according to claim 1, wherein: the lower anchor head dehumidifying structure of the stay cable further comprises a shock absorber, the sealing elements are rubber sheets, the number of the sealing elements is two, the two rubber sheets are respectively located on two sides of the shock absorber, the outer edge of each rubber sheet is sealed with the inner wall of the cable guide pipe, the inner edge of each rubber sheet is sealed with the outer wall of the steel strand, and the steel strand penetrates through the rubber sheets and the shock absorber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067361.3A CN111155415A (en) | 2020-01-20 | 2020-01-20 | Stay cable lower anchor head dehumidification structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067361.3A CN111155415A (en) | 2020-01-20 | 2020-01-20 | Stay cable lower anchor head dehumidification structure |
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| Publication Number | Publication Date |
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| CN111155415A true CN111155415A (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010067361.3A Pending CN111155415A (en) | 2020-01-20 | 2020-01-20 | Stay cable lower anchor head dehumidification structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111778852A (en) * | 2020-06-18 | 2020-10-16 | 中建三局第二建设工程有限责任公司 | Installation method of stay cable dehumidification system |
| CN113463515A (en) * | 2021-07-18 | 2021-10-01 | 广西路建工程集团有限公司 | Construction method of double-sealing inhaul cable anchorage device |
| CN113818346A (en) * | 2021-09-13 | 2021-12-21 | 上海浦江缆索股份有限公司 | Stay cable auxiliary mechanism based on dehumidification system and dehumidification method |
| CN114075808A (en) * | 2020-08-17 | 2022-02-22 | 比亚迪股份有限公司 | Cable-stayed bridge structure |
-
2020
- 2020-01-20 CN CN202010067361.3A patent/CN111155415A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111778852A (en) * | 2020-06-18 | 2020-10-16 | 中建三局第二建设工程有限责任公司 | Installation method of stay cable dehumidification system |
| CN114075808A (en) * | 2020-08-17 | 2022-02-22 | 比亚迪股份有限公司 | Cable-stayed bridge structure |
| CN113463515A (en) * | 2021-07-18 | 2021-10-01 | 广西路建工程集团有限公司 | Construction method of double-sealing inhaul cable anchorage device |
| CN113818346A (en) * | 2021-09-13 | 2021-12-21 | 上海浦江缆索股份有限公司 | Stay cable auxiliary mechanism based on dehumidification system and dehumidification method |
| CN113818346B (en) * | 2021-09-13 | 2023-05-02 | 上海浦江缆索股份有限公司 | Stay cable auxiliary mechanism based on dehumidification system and dehumidification method |
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Effective date of registration: 20210622 Address after: Room 1008, Tianli Central Business Plaza, Yuehai street, Nanshan District, Shenzhen City, Guangdong Province Applicant after: SHENZHEN KELANDE INDUSTRIAL DEVELOPMENT Co.,Ltd. Applicant after: Liuzhou Ouweimu Machinery Co.,Ltd. Address before: Room 1008, Tianli Central Business Plaza, Yuehai street, Nanshan District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN KELANDE INDUSTRIAL DEVELOPMENT Co.,Ltd. |