CN114214938B - Anchoring strength improving method for carbon fiber inhaul cable - Google Patents
Anchoring strength improving method for carbon fiber inhaul cable Download PDFInfo
- Publication number
- CN114214938B CN114214938B CN202111397112.1A CN202111397112A CN114214938B CN 114214938 B CN114214938 B CN 114214938B CN 202111397112 A CN202111397112 A CN 202111397112A CN 114214938 B CN114214938 B CN 114214938B
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- carbon fiber
- anchoring
- shaft hole
- fixed end
- fiber rod
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 114
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 114
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000004873 anchoring Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 8
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010420 art technique Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 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
- 238000006467 substitution reaction Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A method for improving the anchoring strength of a carbon fiber inhaul cable provides an anchor cup, wherein the anchor cup comprises an anchor cup main body and a shaft hole, and at least one carbon fiber rod is provided, and comprises 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, and one end of the carbon fiber rod, which faces the fixed end, is accommodated in the shaft hole. And injecting an anchoring material into the shaft hole so as to form a first anchoring piece at one end of the shaft hole, which is opposite to the fixed end. And a pressure-bearing component is arranged on one side of the first anchoring piece, which faces the fixed end. And injecting anchoring material into one end of the pressure-bearing assembly, which is opposite to the first anchoring member, so as to enable the shaft hole to face one end of the fixed end to form a second anchoring member. According to the method for improving the anchoring strength of the carbon fiber inhaul cable, the integral axial pressure of the anchoring material is reduced, the anchoring material is prevented from being cracked in the radial direction 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 an anchoring strength improving method of a carbon fiber inhaul cable.
Background
With the development of the bridge structure to ultra-large span, the adoption of the traditional steel inhaul cable can face the problems of limited limiting span, large inhaul cable sag, low bearing efficiency and the like due to larger specific gravity of steel. The inhaul cable is easy to generate stress corrosion when being in a high-stress state for a long time. In recent years, cables of bridges with built cable bearing systems are inspected at home and abroad, and the main cable and steel wires in stay cables are seriously corroded, so that the bridge cables are in face of threat and serious challenge of durability. At present, the strength grade of the steel wire for the bridge cable reaches 2100MPa, and the strength of the steel wire cable is limited by the factors of steel materials and anchoring materials, so that the strength of the steel wire cable is improved to the limit.
The weight of the carbon fiber inhaul cable material is only about 1/5 of that of the 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. Can fundamentally solve the problems of replacement and potential safety hazard caused by easy corrosion, vibration fatigue and the like of the traditional inhaul cable. The carbon fiber inhaul cable is adopted to replace the steel inhaul cable, and has important significance for improving the inhaul cable bearing capacity and reducing the economic index of the large-span cable bearing bridge.
However, the research and development of the carbon fiber inhaul cable in the industry at present all encounters the problem that the anchoring strength is difficult to match with the strength of the carbon fiber rod. Because the carbon fiber rod has a low friction coefficient and a low elastic modulus, the carbon fiber rod is pulled out from the anchoring material when the carbon fiber rod is stretched to about 1000 MPa. After the wedge nail is added at the rear end of the carbon fiber rod, the problem that the wedge nail is easy to pull out is solved, but because the angle of the rear end is increased, the anchoring material is easy to crack when bearing radial outward load, and the anchoring strength is influenced.
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.
The method for improving the anchoring strength of the 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 a shaft hole arranged on the axial direction of the anchor cup main body, and the outer contour of the shaft hole is conical;
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 on 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 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 of the carbon fiber rod, which faces the fixed end, is accommodated in the shaft hole;
step S130: injecting an anchoring material into the shaft hole so as to form a first anchoring piece at one end of the shaft hole, which is opposite to the fixed end;
step S140: a pressure-bearing component is arranged on one side of the first anchoring piece, which faces the fixed end;
step S150: and injecting anchoring material into one end of the pressure-bearing assembly, which is opposite to the first anchoring member, so as to enable the shaft hole to face one end of the fixed end to form a second anchoring member.
Further, step S160: and a composite protective layer is arranged on the side wall of the carbon fiber rod.
Further, 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 yarns, aramid fiber yarns and glass fiber yarns.
Further, the taper angle of the wedge nail is 5-10 degrees.
Further, one end of the wedge nail facing the pressure-bearing component is flush with one end of the pressure-bearing component facing the fixed end.
Further, one end of the wedge nail facing the pressure-bearing component is flush with one end of the pressure-bearing component facing the fixed end.
Further, the central shaft of the carbon fiber rod coincides with the central shaft of the anchor cup.
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 there is no tension on the carbon fiber rod, the bearing assembly, the first anchoring member, the second anchoring member and the anchor cup are in clearance fit.
Compared with the prior art, the anchoring strength improving method of the carbon fiber inhaul cable is characterized in that the carbon fiber rod is in a stress-free state and is placed in the shaft hole of the anchor cup in a straight line, 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 arranged at one end of the carbon fiber rod main body, a mounting hole arranged on the free end of the fixed end, and a wedge nail arranged in the mounting hole. And an anchoring material is injected 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 piece, a pressure-bearing component is arranged on one side of the first anchoring piece, which faces towards the fixed end, and an anchoring material is injected into one end of the pressure-bearing component, which faces away from the first anchoring piece, so that a second anchoring piece is formed on one end of the shaft hole, which faces towards the fixed end. 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 tapered, the taper angle directions 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 axially borne 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 integral 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, in 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 easily, and the service life is prolonged.
Drawings
Fig. 1 is a flowchart of a method for improving the anchoring strength of a carbon fiber inhaul cable.
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 embodiments of the present invention are described in further detail below. It should be understood that the description herein of the 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 inhaul 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 a shaft hole 12 arranged on the axial direction of the anchor cup main body 11, and the outer contour of the shaft hole 12 is tapered;
step S110: at least one carbon fiber rod 20 inserted into the shaft hole 12 is provided, the carbon fiber rod 20 includes a carbon fiber rod body 21, a fixed end 22 disposed at one end of the carbon fiber rod body 21, a mounting hole 23 disposed at a free end of the fixed end 22, and a wedge 24 disposed in the mounting hole 23. The outer contours of the fixed end 22, the mounting hole 23 and the wedge nail 24 are tapered, and 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 placed in the shaft hole 12 in a straight line, and one end of the carbon fiber rod 20, which faces the fixed end 22, is accommodated in the shaft hole 12;
step S130: injecting an anchoring material into the shaft hole 12 to form a first anchoring member 30 at one end of the shaft hole 12 facing away from the fixed end 22;
step S140: a pressure-bearing member 40 is provided at a side of the first anchor 30 toward the fixed end 22;
step S150: injecting anchoring material into the end of the bearing assembly 40 facing away from the first anchoring member 30 to form a second anchoring member 50 at the end of the shaft bore 12 facing the fixed end 22;
step S160: a composite protective layer 60 is provided on the side wall of the carbon fiber rod 20.
Fig. 2 is a schematic structural diagram of an anchoring device using a carbon fiber cable in the method for improving the anchoring strength of a carbon fiber cable according to the present invention. The anchoring device of the carbon fiber inhaul cable comprises an anchor cup 10, a carbon fiber rod 20 inserted into the anchor cup 10, a first anchoring member 30, a pressure-bearing assembly 40, a second anchoring member 50 which are sequentially contained in the anchor cup 10, and a composite protective layer 60 sleeved on the side wall of the carbon fiber rod 20. The anchoring device of the carbon fiber cable also comprises other functional modules, such as assembly components and the like, which should be known to those skilled in the art, and will not be described in detail here.
The anchor cup 10 includes an anchor cup body 11, and a shaft hole 12 provided in an axial direction of the anchor cup body 11. The outer contour of the shaft hole 12 is tapered.
The carbon fiber rod 20 includes a carbon fiber rod body 21, a fixed end 22 disposed at one end of the carbon fiber rod body 21, a mounting hole 23 disposed at a free end of the fixed end 22, and a wedge nail 24 disposed in the mounting hole 23, wherein the outer contours of the fixed end 22, the mounting hole 23, and the wedge nail 24 are tapered, the taper angle of the wedge nail 24 is 5-10 degrees, and the carbon fiber rod body 21 is fixedly connected with the wedge nail 24 by an adhesive, so that an integral body is formed between the carbon fiber rod body 21 and the wedge nail 24, and the fixed end 22 can maintain 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, when the carbon fiber rod 20 is pulled by axial force, 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. One end of the wedge pin 24 facing the pressure-bearing assembly 40 is flush with one end of the pressure-bearing assembly 40 facing the fixed end 22, so that the fixed end 22 is deformed and the outer contour is kept tapered under the support of the wedge pin 24, and the position of the pressure-bearing assembly 40 is limited.
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 force to the anchor cup 10.
The first anchoring member 30 and the second anchoring member 50 are both formed by injecting an anchoring material, which is a prior art technique, into the shaft hole 12. 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 spaced apart from each other in the shaft hole 12, 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 bearing assembly 40 synchronously, the fixed end 22 transmits the force borne by the axial direction to the bearing assembly 40, the bearing assembly 40 utilizes the spring 42 to buffer, the 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 tension on the carbon fiber rod 20, the 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 force, the bearing assembly 40, the first anchoring member 30 and the second anchoring member 50 slide along the shaft hole 12 of the anchor cup 10, so that a buffer zone exists when the bearing assembly 40, the first anchoring member 30 and the second anchoring member 50 are pulled under force, and the forced pulling process of the carbon fiber rod 20 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 yarn, aramid fiber and glass fiber. The composite protective layer 60 serves to protect the carbon fiber rod 20 from damage.
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 rods 20 are in an unstressed state and are placed in the shaft holes 12 of the anchor cup 10 in a straight line, and one ends of the carbon fiber rods 20, which face the fixed ends 22, are accommodated in the shaft holes 12 of the anchor cup 10. The carbon fiber rod 20 includes a carbon fiber rod body 21, a fixed end 22 disposed at one end of the carbon fiber rod body 21, a mounting hole 23 disposed at a free end of the fixed end 22, and a wedge 24 disposed in the mounting hole 23. And injecting anchoring material into the shaft hole 12 to form a first anchoring member 30 at the end of the shaft hole 12 facing away from the fixed end 22, arranging a bearing assembly 40 at the side of the first anchoring member 30 facing towards the fixed end 22, and injecting anchoring material at the end of the bearing assembly 40 facing away from the first anchoring member 30 to form a second anchoring member 50 at the end of the shaft hole 12 facing towards the fixed end 22. The outer contours of the fixed end 22, the mounting hole 23 and the wedge nail 24 are tapered, and the taper angles of the shaft hole 12, the fixed end 22, the mounting hole 23 and the wedge nail 24 are consistent. The outer contours of the shaft hole 12, the fixed end 22, the mounting hole 23 and the wedge nail 24 are tapered, and 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 synchronously moves towards one side of the pressure-bearing assembly 40, the fixed end 22 transmits the axially borne force to the pressure-bearing assembly 40, the pressure-bearing assembly 40 can buffer the force on the fixed end 22, the pressure-bearing assembly 40 transmits the reactive force to the second anchoring member 50, and after the second anchoring member 50 bears the whole 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. Therefore, in 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 easily, and the service life is prolonged.
The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions or improvements within the spirit of the present invention are intended to be covered by the claims of the present invention.
Claims (10)
1. The method for improving the anchoring strength of the 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 a shaft hole arranged on the axial direction of the anchor cup main body, and the outer contour of the shaft hole is conical;
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 on 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 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 of the carbon fiber rod, which faces the fixed end, is accommodated in the shaft hole;
step S130: injecting an anchoring material into the shaft hole so as to form a first anchoring piece at one end of the shaft hole, which is opposite to the fixed end;
step S140: a pressure-bearing component is arranged on one side of the first anchoring piece, which faces the fixed end;
step S150: and injecting anchoring material into one end of the pressure-bearing assembly, which is opposite to the first anchoring member, so as to enable the shaft hole to face one end of the fixed end to form a second anchoring member.
2. The anchoring strength improving method of a carbon fiber cable 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 anchoring strength improving method of a carbon fiber inhaul cable according to claim 2, 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 anchoring strength improving method of a carbon fiber inhaul cable according to claim 3, wherein: the wear-resistant layer is made of one of basalt fiber yarns, aramid fiber yarns and glass fiber yarns.
5. The anchoring strength improving method of a carbon fiber inhaul cable according to claim 1, wherein: the taper angle of the wedge nail is 5-10 degrees.
6. The anchoring strength improving method of a carbon fiber inhaul cable according to claim 1, wherein: one end of the wedge nail, which faces the pressure-bearing component, is flush with one end of the pressure-bearing component, which faces the fixed end.
7. The anchoring strength improving method of a carbon fiber inhaul cable according to claim 1, wherein: the carbon fiber rod main body is fixedly connected with the wedge nail through an adhesive.
8. The anchoring strength improving method of a carbon fiber inhaul cable according to claim 1, wherein: the central shaft of the carbon fiber rod coincides with the central shaft of the anchor cup.
9. The anchoring strength improving method of a carbon fiber inhaul cable according to claim 1, wherein: the pressure-bearing assembly comprises two pressure-bearing plates which are arranged in the shaft hole at intervals, and a spring which is clamped between the pressure-bearing plates.
10. The anchoring strength improving method of a carbon fiber inhaul cable according to claim 1, wherein: when no tension exists on the carbon fiber rod, the pressure-bearing component, 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 CN114214938A (en) | 2022-03-22 |
| CN114214938B true 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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| NO322852B1 (en) * | 2000-05-31 | 2006-12-11 | Aker Kvaerner Subsea As | Termination of tension body |
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| CN114214938A (en) | 2022-03-22 |
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