CN114214938A - Anchoring strength improving method of carbon fiber inhaul cable - Google Patents
Anchoring strength improving method of carbon fiber inhaul cable Download PDFInfo
- Publication number
- CN114214938A CN114214938A CN202111397112.1A CN202111397112A CN114214938A CN 114214938 A CN114214938 A CN 114214938A CN 202111397112 A CN202111397112 A CN 202111397112A CN 114214938 A CN114214938 A CN 114214938A
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- Prior art keywords
- carbon fiber
- anchoring
- fixed end
- fiber rod
- shaft hole
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Links
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 117
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 117
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 238000004873 anchoring Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000010410 layer Substances 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 9
- 239000011241 protective layer Substances 0.000 claims description 9
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 239000004760 aramid Substances 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The anchor strength improving method of the carbon fiber inhaul cable comprises the steps of providing an anchor cup, wherein the anchor cup comprises an anchor cup main body and a shaft hole, providing at least one carbon fiber rod, and enabling the carbon fiber rod to comprise a carbon fiber rod main body, a fixed end, a mounting hole and a wedge nail. The carbon fiber rod is in an unstressed state and is placed in the shaft hole in a straight line mode, and one end, facing the fixed end, of the carbon fiber rod is contained in the shaft hole. And injecting anchoring materials into the shaft hole so as to enable the shaft hole to be back to one end of the fixed end to form a first anchoring part. And a bearing assembly is arranged on one side of the first anchoring piece, which faces the fixed end. And injecting anchoring materials into one end of the bearing assembly, which is back to the first anchoring part, so as to enable the shaft hole to face one end of the fixed end to form a second anchoring part. According to the method for improving the anchoring strength of the carbon fiber inhaul cable, the whole axial pressure of the anchoring material is reduced, the anchoring material is prevented from being cracked radially in the stress process, and the service life is prolonged.
Description
Technical Field
The invention belongs to the technical field of carbon fiber inhaul cables, and particularly relates to a method for improving the anchoring strength of a carbon fiber inhaul cable.
Background
Along with the development of a bridge structure to an ultra-large span, the traditional steel stay cable has the problems of limited limit span, large sag, low bearing efficiency and the like. The inhaul cable is in service under a high stress state for a long time, and stress corrosion is easy to generate. In recent years, the cable of the bridge with the built cable bearing system is inspected at home and abroad, and the corrosion of steel wires in a main cable and a stay cable is found to be very serious, so that the bridge cable faces the threat and the serious challenge of durability. At present, the strength grade of the steel wire for the bridge cable reaches 2100MPa, is limited by steel materials and anchoring materials, and the strength of the steel wire inhaul cable is improved to the limit.
The weight of the carbon fiber inhaul cable material is only about 1/5 of that of a steel wire, the tensile strength can reach 3000MPa, and the carbon fiber inhaul cable material has excellent performances of corrosion resistance, fatigue resistance and the like, and is very suitable for replacing the traditional steel inhaul cable. The problems of replacement and potential safety hazards caused by the fact that a traditional inhaul cable is prone to corrosion, vibration fatigue and the like can be fundamentally solved. The carbon fiber inhaul cable is adopted to replace a steel inhaul cable, and the carbon fiber inhaul cable has important significance for improving the carrying capacity of the inhaul cable and reducing the economic indexes of the large-span cable bearing bridge.
But the research and development of carbon fiber inhaul cables in the industry at present have met the difficult problem that the anchoring strength is difficult to match with the strength of the carbon fiber rods. Due to the low friction coefficient and low elastic modulus of the carbon fiber rod, the carbon fiber rod is often pulled out of the anchoring material when the carbon fiber rod is stretched to about 1000 MPa. After the wedge nail is additionally arranged at the rear end of the carbon fiber rod, the problem that the carbon fiber rod is easy to pull out is solved, but due to the fact that the angle of the rear end is increased, the anchoring material is easy to crack when bearing radial outward load, and anchoring strength is affected.
Disclosure of Invention
In view of the above, the invention provides a method for improving the anchoring strength of a carbon fiber inhaul cable for reducing the stress of an anchoring material, so as to meet the industrial requirements.
A method for improving the anchoring strength of a carbon fiber inhaul cable comprises the following specific steps:
step S100: providing an anchor cup, wherein the anchor cup comprises an anchor cup main body and an axle hole arranged on the axial direction of the anchor cup main body, and the outer contour of the axle hole is tapered;
step S110: providing at least one carbon fiber rod inserted into the shaft hole, wherein the carbon fiber rod comprises a carbon fiber rod main body, a fixed end arranged at one end of the carbon fiber rod main body, a mounting hole arranged at the free end of the fixed end, and a wedge nail arranged in the mounting hole, the outer contours of the fixed end, the mounting hole and the wedge nail are all tapered, and the directions of the taper angles of the shaft hole, the fixed end, the mounting hole and the wedge nail are consistent;
step S120: the carbon fiber rod is in an unstressed state and is placed in the shaft hole in a straight line, and one end, facing the fixed end, of the carbon fiber rod is accommodated in the shaft hole;
step S130: injecting anchoring materials into the shaft hole so as to enable the shaft hole to be back to one end of the fixed end to form a first anchoring piece;
step S140: a pressure bearing assembly is arranged on one side, facing the fixed end, of the first anchoring piece;
step S150: and injecting anchoring materials into one end of the bearing assembly, which is back to the first anchoring part, so as to enable the shaft hole to face one end of the fixed end to form a second anchoring part.
Further, step S160: and a composite protective layer is arranged on the side wall of the carbon fiber rod.
Furthermore, the composite protective layer comprises a steel wire layer arranged on the carbon fiber rod and a wear-resistant layer sleeved on the steel wire layer.
Further, the wear-resistant layer is made of one of basalt fiber filaments, aramid fibers and glass fibers.
Further, the taper angle of the wedge nail is 5-10 degrees.
Further, one end, facing the bearing assembly, of the wedge nail is flush with one end, facing the fixed end, of the bearing assembly.
Further, one end, facing the bearing assembly, of the wedge nail is flush with one end, facing the fixed end, of the bearing assembly.
Further, the carbon fiber rod central shaft and the anchor cup central shaft are superposed with the pressure-bearing assembly.
Further, the bearing assembly comprises two bearing plates which are arranged in the shaft hole at intervals, and a spring which is clamped between the bearing plates.
Further, when no tensile force is applied to the carbon fiber rod, the bearing assembly, the first anchoring piece, the second anchoring piece and the anchor cup are in clearance fit.
Compared with the prior art, the anchoring strength improving method of the carbon fiber inhaul cable provided by the invention has the advantages that the carbon fiber rod is in an unstressed state and is linearly placed in the shaft hole of the anchor cup, and one end, facing the fixed end, of the carbon fiber rod is accommodated in the shaft hole of the anchor cup. The carbon fiber rod comprises a carbon fiber rod main body, a fixed end, a mounting hole and a wedge nail, wherein the fixed end is arranged at one end of the carbon fiber rod main body, the mounting hole is arranged at the free end of the fixed end, and the wedge nail is arranged in the mounting hole. And injecting an anchoring material into the shaft hole so as to enable one end of the shaft hole, which faces away from the fixed end, to form a first anchoring part, arranging a pressure-bearing assembly on one side, which faces towards the fixed end, of the first anchoring part, and injecting the anchoring material into one end, which faces away from the first anchoring part, of the pressure-bearing assembly so as to enable one end of the shaft hole, which faces towards one end of the fixed end, to form a second anchoring part. The outer contours of the fixed end, the mounting hole and the wedge nail are tapered, and the taper angle directions of the shaft hole, the fixed end, the mounting hole and the wedge nail are consistent. The outer contours of the shaft hole, the fixed end, the mounting hole and the wedge nail are all tapered, the directions of taper angles of the shaft hole, the fixed end, the mounting hole and the wedge nail are consistent, so that the position of the carbon fiber rod in the anchor cup is limited, when the carbon fiber rod is stressed, the fixed end synchronously moves towards one side of the pressure bearing assembly, the fixed end transmits the axial bearing force to the pressure bearing assembly, the pressure bearing assembly can buffer the force on the fixed end, the pressure bearing assembly transmits the reaction force to the second anchoring member, and after the second anchoring member bears the whole extrusion, the friction force between the second anchoring member and the carbon fiber rod is improved, so that the axial bearing capacity of the carbon fiber rod is improved. Therefore, the anchoring strength of the carbon fiber inhaul cable is improved by reducing the whole axial pressure on the anchoring material, the anchoring material is prevented from being cracked radially in the stress process, and the service life is prolonged.
Drawings
Fig. 1 is a flowchart of a method for improving the anchoring strength of a carbon fiber cable according to the present invention.
Fig. 2 is a schematic structural view of an anchoring device using a carbon fiber cable in the method for improving the anchoring strength of the carbon fiber cable of fig. 1.
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
Fig. 1 is a flowchart of a method for improving the anchoring strength of a carbon fiber cable according to the present invention. The method for improving the anchoring strength of the carbon fiber inhaul cable comprises the following specific steps:
step S100: providing an anchor cup 10, wherein the anchor cup comprises an anchor cup main body 11 and an axial hole 12 arranged on the axial direction of the anchor cup main body 11, and the outer contour of the axial hole 12 is tapered;
step S110: providing at least one carbon fiber rod 20 inserted into the shaft hole 12, wherein the carbon fiber rod 20 comprises a carbon fiber rod main body 21, a fixed end 22 arranged at one end of the carbon fiber rod main body 21, a mounting hole 23 arranged at the free end of the fixed end 22, and a wedge nail 24 arranged in the mounting hole 23. The outer contours of the fixed end 22, the mounting hole 23 and the wedge nail 24 are all tapered, and the directions of the taper angles of the shaft hole 12, the fixed end 22, the mounting hole 23 and the wedge nail 24 are consistent;
step S120: the carbon fiber rod 20 is in an unstressed state and is linearly placed in the shaft hole 12, and one end, facing the fixed end 22, of the carbon fiber rod 20 is accommodated in the shaft hole 12;
step S130: injecting anchoring materials into the shaft hole 12 to enable one end of the shaft hole 12, which faces away from the fixed end 22, to form a first anchoring piece 30;
step S140: a bearing assembly 40 is arranged on one side of the first anchoring piece 30 facing the fixed end 22;
step S150: injecting anchoring material into the end of the bearing assembly 40 opposite to the first anchoring member 30 to form a second anchoring member 50 from the shaft hole 12 toward the fixed end 22;
step S160: a composite protective layer 60 is arranged on the side wall of the carbon fiber rod 10.
As shown in fig. 2, it is a schematic structural view of an anchoring device using a carbon fiber cable in the method for improving anchoring strength of a carbon fiber cable provided by the present invention. The anchoring device of the carbon fiber inhaul cable comprises an anchor cup 10, a carbon fiber rod 20 inserted in the anchor cup 10, a first anchoring part 30, a pressure-bearing assembly 40, a second anchoring part 50 and a composite protective layer 60, wherein the first anchoring part 30, the pressure-bearing assembly 40 and the second anchoring part 50 are sequentially accommodated in the anchor cup 10, and the composite protective layer is sleeved on the side wall of the carbon fiber rod 20. The anchoring device for the carbon fiber cable further includes other functional modules, such as assembling components and the like, which are well known to those skilled in the art and will not be described in detail herein.
The anchor cup 10 includes an anchor cup body 11, and an axial hole 12 provided in an axial direction of the anchor cup body 11. The outer profile of the shaft hole 12 is tapered.
The carbon fiber rod 20 comprises a carbon fiber rod main body 21, a fixed end 22 arranged at one end of the carbon fiber rod main body 21, a mounting hole 23 arranged at the free end of the fixed end 22, and a wedge nail 24 arranged in the mounting hole 23, wherein the outer contours of the fixed end 22, the mounting hole 23 and the wedge nail 24 are all tapered, the taper angle of the wedge nail 24 is 5-10 degrees, the carbon fiber rod main body 21 and the wedge nail 24 are fixedly connected through a bonding agent, so that the carbon fiber rod main body 21 and the wedge nail 24 form a whole, and the fixed end 22 can keep a tapered state under the support of the wedge nail 24. The taper angles of the shaft hole 12, the fixed end 22, the mounting hole 23 and the wedge nail 24 are consistent in direction, when the carbon fiber rod 20 is pulled under axial stress, the fixed end 22, the wedge nail 24, the first anchoring member 30, the pressure-bearing assembly 40 and the second anchoring member 50 are gradually tightened in the shaft hole along with the pulling of the carbon fiber rod 20, so that the friction force between the carbon fiber rod 20 and the second anchoring member 50 is increased, and the position of the carbon fiber rod 20 in the anchor cup 10 is stable. The wedge pin 24 is flush with the end of the bearing assembly 40 facing the fixed end 22, so that the fixed end 22 deforms and keeps the outer contour tapered to limit the position of the bearing assembly 40 under the support of the wedge pin 24.
The central axis of the carbon fiber rod 20 coincides with the central axis of the anchor cup 10, and when the carbon fiber rod 20 is stressed, the carbon fiber rod 20 uniformly transmits the force to the anchor cup 10.
The first anchoring member 30 and the second anchoring member 50 are formed by injecting anchoring material into the shaft hole 12, and the anchoring material is a prior art. The first anchor 30 and the second anchor 50 have the same shape as the gap between the carbon fiber rod 20 and the anchor cup body 11, thereby supporting the carbon fiber rod 20.
The bearing assembly 40 includes two bearing plates 41 disposed in the shaft hole 12 at intervals, and a spring 42 interposed between the bearing plates 41.
When the carbon fiber rod 20 is stressed, the fixed end 22 moves towards one side of the pressure bearing assembly 40 synchronously, the fixed end 22 transmits the axial bearing force to the pressure bearing assembly 40, the pressure bearing assembly 40 is buffered by the spring 42, the pressure bearing assembly 40 transmits the reaction force to the second anchoring member 50, and after the second anchoring member 50 bears the integral extrusion, the friction force between the second anchoring member 50 and the carbon fiber rod 20 is improved, so that the axial bearing capacity of the carbon fiber rod 20 is improved. When there is no pulling force on the carbon fiber rod 20, the pressure-bearing assembly 40, the first anchoring member 30, the second anchoring member 50 and the anchor cup 10 are in clearance fit, and when the carbon fiber rod 20 is pulled under a force, the pressure-bearing assembly 40, the first anchoring member 30 and the second anchoring member 50 all slide along the shaft hole 12 of the anchor cup 10, so that a buffer zone exists when the pressure-bearing assembly 40, the first anchoring member 30 and the second anchoring member 50 are pulled under a force, and the pulling process of the carbon fiber rod 20 under a force is stable.
The composite protective layer 60 comprises a steel wire layer 61 arranged on the carbon fiber rod 20, and a wear-resistant layer 62 sleeved on the steel wire layer 61. The wear-resistant layer 62 is made of one of basalt fiber filaments, aramid fibers and glass fibers. The composite protective layer 60 serves to protect the carbon fiber rod 20 from damage.
Compared with the prior art, the anchoring strength of the carbon fiber inhaul cable provided by the invention is improved by placing the carbon fiber rod 20 in the shaft hole 12 of the anchor cup 10 in a stress-free state in a straight line, and accommodating one end of the carbon fiber rod 20 facing the fixed end 22 in the shaft hole 12 of the anchor cup 10. The carbon fiber rod 20 comprises a carbon fiber rod main body 21, a fixed end 22 arranged at one end of the carbon fiber rod main body 21, a mounting hole 23 arranged at the free end of the fixed end 22, and a wedge nail 24 arranged in the mounting hole 23. And injecting an anchoring material into the shaft hole 12 to enable one end of the shaft hole 12, which faces away from the fixed end 22, to form a first anchoring member 30, arranging a pressure-bearing assembly 40 on one side, which faces towards the fixed end 22, of the first anchoring member 30, and injecting the anchoring material into one end, which faces away from the first anchoring member 30, of the pressure-bearing assembly 40 to form a second anchoring member 50 on one end, which faces towards the fixed end 22, of the shaft hole 12. The outer contours of the fixing end 22, the mounting hole 23 and the wedge nail 24 are tapered, and the taper angles of the shaft hole 12, the fixing end 22, the mounting hole 23 and the wedge nail 24 are consistent in direction. The outer contours of the shaft hole 12, the fixing end 22, the mounting hole 23, and the wedge pins 24 are tapered, and the directions of the taper angles of the shaft hole 12, the fixed end 22, the mounting hole 23 and the wedge nail 24 are consistent, so as to limit the position of the carbon fiber rod 20 in the anchor cup 10, when the carbon fiber rod 20 is stressed, the fixed end 22 moves towards the side of the bearing component 40 synchronously, the fixed end 22 transmits the axial bearing force to the bearing assembly 40, the bearing assembly 40 can buffer the force on the fixed end 22, and the bearing assembly 40 transmits the reaction force to the second anchoring member 50, and after the second anchoring member 50 is subjected to the integral extrusion, the friction between the second anchor 50 and the carbon fiber rod 20 is increased, thereby increasing the axial load-bearing capacity of the carbon fiber rod 20. Therefore, the anchoring strength of the carbon fiber inhaul cable is improved by reducing the whole axial pressure on the anchoring material, the anchoring material is prevented from being cracked radially in the stress process, and the service life is prolonged.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (10)
1. A method for improving the anchoring strength of a carbon fiber inhaul cable comprises the following specific steps:
step S100: providing an anchor cup, wherein the anchor cup comprises an anchor cup main body and an axle hole arranged on the axial direction of the anchor cup main body, and the outer contour of the axle hole is tapered;
step S110: providing at least one carbon fiber rod inserted into the shaft hole, wherein the carbon fiber rod comprises a carbon fiber rod main body, a fixed end arranged at one end of the carbon fiber rod main body, a mounting hole arranged at the free end of the fixed end, and a wedge nail arranged in the mounting hole, the outer contours of the fixed end, the mounting hole and the wedge nail are all tapered, and the directions of the taper angles of the shaft hole, the fixed end, the mounting hole and the wedge nail are consistent;
step S120: the carbon fiber rod is in an unstressed state and is placed in the shaft hole in a straight line, and one end, facing the fixed end, of the carbon fiber rod is accommodated in the shaft hole;
step S130: injecting anchoring materials into the shaft hole so as to enable the shaft hole to be back to one end of the fixed end to form a first anchoring piece;
step S140: a pressure bearing assembly is arranged on one side, facing the fixed end, of the first anchoring piece;
step S150: and injecting anchoring materials into one end of the bearing assembly, which is back to the first anchoring part, so as to enable the shaft hole to face one end of the fixed end to form a second anchoring part.
2. The method for improving anchoring strength of the carbon fiber rope according to claim 1, further comprising the steps of: step S160: and a composite protective layer is arranged on the side wall of the carbon fiber rod.
3. The method for improving the anchoring strength of a carbon fiber cable according to claim 1, wherein: the composite protective layer comprises a steel wire layer arranged on the carbon fiber rod and a wear-resistant layer sleeved on the steel wire layer.
4. The method of improving the anchoring strength of the carbon fiber cable according to claim 3, wherein: the wear-resistant layer is made of one of basalt fiber filaments, aramid fibers and glass fibers.
5. The method for improving the anchoring strength of a carbon fiber cable according to claim 1, wherein: the taper angle of the wedge nail is 5-10 degrees.
6. The method for improving the anchoring strength of a carbon fiber cable according to claim 1, wherein: one end, facing the pressure bearing assembly, of the wedge nail is flush with one end, facing the fixed end, of the pressure bearing assembly.
7. The method for improving the anchoring strength of a carbon fiber cable according to claim 1, wherein: the carbon fiber rod main body and the wedge nail are fixedly connected by adopting a bonding agent.
8. The method for improving the anchoring strength of a carbon fiber cable according to claim 1, wherein: the carbon fiber rod central shaft and the anchor cup central shaft are superposed with the pressure-bearing assembly.
9. The method for improving the anchoring strength of a carbon fiber cable according to claim 1, wherein: the bearing assembly comprises two bearing plates which are arranged in the shaft hole at intervals and a spring which is clamped between the bearing plates.
10. The method for improving the anchoring strength of a carbon fiber cable according to claim 1, wherein: when no tension is applied to the carbon fiber rod, the pressure bearing assembly, the first anchoring piece, the second anchoring piece and the anchor cup are in clearance fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111397112.1A CN114214938B (en) | 2021-11-23 | 2021-11-23 | Anchoring strength improving method for carbon fiber inhaul cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111397112.1A CN114214938B (en) | 2021-11-23 | 2021-11-23 | Anchoring strength improving method for carbon fiber inhaul cable |
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| Publication Number | Publication Date |
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| CN114214938A true CN114214938A (en) | 2022-03-22 |
| CN114214938B CN114214938B (en) | 2023-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111397112.1A Active CN114214938B (en) | 2021-11-23 | 2021-11-23 | Anchoring strength improving method for carbon fiber inhaul cable |
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| CN108035254A (en) * | 2017-12-26 | 2018-05-15 | 浙锚科技股份有限公司 | Carbon fiber cable-cabin structure |
| CN113585631A (en) * | 2021-07-30 | 2021-11-02 | 哈尔滨工业大学 | Continuous curved conical composite anchor device and method for multi-beam carbon fiber parallel inhaul cable |
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2021
- 2021-11-23 CN CN202111397112.1A patent/CN114214938B/en active Active
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| US5713169A (en) * | 1994-04-25 | 1998-02-03 | Eidgenossische Materialprufungsund Forschungsanstalt EMPA | Anchorage device for high-performance fiber composite cables |
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|---|---|
| CN114214938B (en) | 2023-11-14 |
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