CN114351945B - Anchoring system and method for carbon fiber tendons - Google Patents
Anchoring system and method for carbon fiber tendons Download PDFInfo
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- CN114351945B CN114351945B CN202210010804.4A CN202210010804A CN114351945B CN 114351945 B CN114351945 B CN 114351945B CN 202210010804 A CN202210010804 A CN 202210010804A CN 114351945 B CN114351945 B CN 114351945B
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Abstract
The invention discloses an anchoring system and method for carbon fiber tendons, wherein the system comprises an extrusion type wire dividing plate, an anchor cup, epoxy iron sand, a wedge block and an aluminum protective shell. The anchor cup is penetrated through the bundled carbon fiber reinforcement bundles, the carbon fiber reinforcement bundles sequentially and correspondingly penetrate through holes corresponding to the extrusion type filament dividing plates, an aluminum protective shell is penetrated through each carbon fiber reinforcement bundle, the tail parts of the carbon fiber reinforcement bundles are inserted into wedge blocks, the aluminum protective shell is clamped to the position with larger diameter of the carbon fiber reinforcement bundles, the extrusion type filament dividing plates are pushed backwards, the aluminum protective shell and the extrusion type filament dividing plates are completely clamped, the anchor cup is moved backwards, the extrusion type filament dividing plates are tightly contacted with the inner wall of the anchor cup, sealing nuts are screwed, epoxy iron sand is filled from the front end of the anchor cup until the junction of the conical inner wall and the horizontal inner wall is reached, and low-modulus epoxy resin is filled into the horizontal end to complete the anchoring of the carbon fiber reinforcement bundles. The anchoring method of the carbon fiber tendon has the advantages of higher anchoring efficiency, simplicity in operation, economy, reasonability and wide application range.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to an anchoring system and method for carbon fiber tendons.
Background
Under the normal use environment, the components used in the traditional structure, such as beams, plates, columns and the like, steel bars in the components can be corroded under the action of air and humid environment, so that the bearing capacity of the structural components is reduced, and in addition, the concrete can be cracked due to expansion caused by corrosion, so that the normal use of the components is seriously influenced.
In order to solve the hidden trouble caused by the structural safety of reinforcement corrosion, engineers have been searching for materials capable of replacing reinforcement in recent decades. Carbon fiber reinforced composite bars have been accepted by engineers by virtue of their excellent corrosion resistance, higher tensile strength and modulus, and can be used as stressing tendons, prestressing tendons, stay cables, ground anchors, etc. in civil engineering structural members instead of reinforcing bars.
The carbon fiber tendons are poor in transverse mechanical property and cannot be anchored by using an anchoring method of the steel strand, if the excellent performance of the carbon fiber tendons is to be fully exerted, the carbon fiber tendons must be anchored by using a proper anchoring method, otherwise, the carbon fiber tendons are subjected to the phenomena of debonding or shearing and breaking, so that the anchoring efficiency is low, the excellent mechanical property of the carbon fiber tendons cannot be fully exerted, and therefore, the anchoring of the carbon fiber tendons is the biggest challenge for carbon fiber tendon application.
At present, the number of the carbon fiber tendons used in practical engineering is far more than one, so that an anchoring method suitable for carbon fiber tendons is needed.
The invention designs an anchoring method for carbon fiber tendons, which adopts an extrusion-bonding anchoring mode, wherein a wedge block, an aluminum protective shell and an extrusion type wire dividing plate are used for forming an extrusion section at the tail part of the carbon fiber tendons, and epoxy iron sand is used for pouring to form a bonding anchoring section. The anchoring method is simple in design and convenient to manufacture, can be used for effectively anchoring the carbon fiber tendons, and is wide in application range.
Disclosure of Invention
The invention aims to provide a carbon fiber tendon anchoring system and method which are high in anchoring efficiency, long-term in use, simple and reliable and wide in application range based on the defects of the existing carbon fiber tendon anchoring method.
The technical scheme adopted by the invention is as follows:
in a first aspect, an anchoring system for carbon fiber tendons, comprising:
the anchor cup comprises an anchor cup body, wherein the inner wall of the anchor cup body is provided with a conical inner wall and a straight inner wall, the contraction end of the conical inner wall is connected with one end of the straight inner wall, epoxy iron sand is filled in the conical inner wall, and epoxy resin is filled in the straight inner wall;
the extrusion type wire dividing plate is clamped at the expansion end of the conical inner wall and provided with a plurality of holes which are in one-to-one correspondence with the carbon fiber tendons;
an aluminum protective shell sleeved between each carbon fiber tendon and the hole;
and the wedge block is fixed at the end part of each carbon fiber tendon and enables the end part of each carbon fiber tendon to be clamped and fixed in the aluminum protective shell.
In some embodiments of the system of the present invention, the seal nut is further comprised of an internal thread on the port of the enlarged end of the tapered inner wall and is threadably engaged with the seal nut.
In some embodiments of the system of the present invention, the inner wall of the anchor cup is circumferentially arranged with a plurality of grooves.
In some embodiments of the system of the present invention, the wedge has a cross section of an isosceles acute triangle, and an end of each of the carbon fiber tows is split into a slit from a middle position, and the wedge is inserted into the slit and fixed by glue.
In some embodiments of the system of the present invention, the aluminum protective shell includes a sleeve section sleeved in the hole of the extruded filament dividing plate and a limiting section located outside the hole, wherein the sleeve section and the inner wall of the limiting section together form a conical through hole of the carbon fiber tendon, and the diameter of the conical through hole gradually contracts from the limiting section to the sleeve section.
In a second aspect, a method for anchoring carbon fiber tendons is realized based on an anchoring system for carbon fiber tendons as described above, comprising the steps of:
the anchor cup passes through the bundled carbon fiber tendons;
sequentially passing carbon fiber tendons through holes corresponding to the extrusion type filament dividing plates, and passing an aluminum protective shell between each carbon fiber tendon and the corresponding hole;
splitting a crack at the end part of the carbon fiber tendon from the middle position, inserting a wedge block, and coating glue to bond and fix the wedge block and the carbon fiber tendon;
the aluminum protective shell is clamped to the position with larger diameter of the carbon fiber tendon, and the extrusion type filament separating plate is pushed backwards, so that the aluminum protective shell and the extrusion type filament separating plate are completely clamped;
moving the anchor cup backwards to enable the extrusion type wire dividing plate to be clamped with the conical inner wall of the anchor cup, and screwing a sealing nut on a port of the conical inner wall;
pouring epoxy iron sand from the front end of the anchor cup until the junction of the conical inner wall and the straight inner wall;
and (5) filling epoxy resin into the straight inner wall.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the anchoring method, the tail parts of all carbon fiber tendons are inserted into the wedge blocks and bonded into a whole, and the extruded type filament dividing plate is used for clamping, so that all carbon fiber tendons can be simultaneously processed in the same tensioning state, and after being stressed, the stress levels of all carbon fiber tendons are close, so that the stress non-uniformity can be greatly reduced;
(2) An aluminum protective shell is adopted between the carbon fiber tendon and the extrusion type wire dividing plate, the modulus of the aluminum protective shell is far smaller than that of steel, and the aluminum protective shell has larger deformability, so that the carbon fiber tendon can be protected from being damaged, and the anchoring efficiency of the anchoring method can be improved;
(3) The front end of the anchor cup adopts the low-modulus epoxy resin, so that the stress concentration phenomenon at the front end of the anchor cup can be reduced, the carbon fiber tendons are prevented from being damaged in the anchor cup in advance, and the bearing capacity and the anchoring efficiency of the anchor are improved;
(4) The inner wall surface of the anchor cup is not a smooth surface, a deeper triangular groove is adopted, and the triangular groove is used for reducing the sliding quantity of the epoxy iron sand, so that the notch effect at the outlet of the anchor cup is reduced, and the aim of improving the anchoring efficiency is fulfilled;
(5) In conclusion, the anchor has reasonable form stress, simple structure, convenient processing and manufacturing, economy and reliability and stable anchoring effect, and can be used for anchoring carbon fiber tendons in various forms.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional structural view of a carbon fiber tendon-anchoring system according to an embodiment of the present invention.
Fig. 2 is a detail view of the inner wall of the anchor cup according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional structure diagram of an extrusion filament dividing plate according to an embodiment of the present invention.
Fig. 4 is a schematic front view of an aluminum protective case according to an embodiment of the present invention.
Fig. 5 is a schematic left-view structural diagram of an aluminum protective case according to an embodiment of the present invention.
Fig. 6 is a schematic front view of a wedge according to an embodiment of the present invention.
Fig. 7 is a schematic left-view structural diagram of a wedge according to an embodiment of the present invention.
In the figure: 1-extrusion type wire dividing plate, 2-anchor cup, 21-conical inner wall, 22-triangular groove, 3-epoxy iron sand, the steel plate comprises a 4-wedge block, a 5-aluminum protective shell, 6-carbon fiber tendons, 7-epoxy resin and 8-sealing nuts.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1 to 7, the invention provides an anchoring system for carbon fiber tendons, which mainly comprises an extrusion type filament dividing plate 1, an anchor cup 2, epoxy iron sand 3, a wedge block 4, an aluminum protective shell 5 and carbon fiber tendons 6.
Specifically, the inner wall of the anchor cup 2 forms a tapered inner wall 21 and a straight inner wall, the tapered inner wall 21 having a constricted end connected to one end of the straight inner wall, the tapered inner wall being filled with the iron oxide sand 3 and the straight inner wall being filled with the low modulus epoxy resin 7. The flat inner wall section of the anchor cup 2 is impregnated with a low modulus epoxy resin 7 which serves to reduce stress concentrations therein.
Further, a plurality of grooves are formed on the inner wall of the anchor cup 2 in the circumferential direction, and as shown in fig. 2, the cross section of the grooves is triangular, so that the grooves are triangular grooves 22. By processing the triangular groove 22 on the inner wall of the anchor cup 2, the friction force between the epoxy iron sand 3 and the inner wall of the anchor cup 2 can be increased, and the sliding quantity of the epoxy iron sand 3 can be reduced, so that the shearing damage of the carbon fiber tendons 6 at the anchor cup 2 is avoided.
The outer peripheral shape of the extrusion type filament dividing plate 1 is consistent with the shape of the conical inner wall 21 of the anchor cup 2, the extrusion type filament dividing plate 1 is clamped at the expansion end of the conical inner wall 21 of the anchor cup 2 when in use, and a plurality of holes which are in one-to-one correspondence with the carbon fiber tendons are formed in the extrusion type filament dividing plate 1. The extrusion type wire dividing plate 1 has the function of extruding and fixing the carbon fiber reinforced bar bundles 6 besides wire dividing, so that the stress levels of all the carbon fiber reinforced bars in the carbon fiber reinforced bar bundles 6 are close to each other, and the stress non-uniformity is reduced.
Further, the aluminum protective shell 5 is sleeved between each carbon fiber tendon 6 and the corresponding hole on the extrusion type filament dividing plate 1 in a one-to-one correspondence manner. Specifically, the aluminum protective shell 5 comprises a sleeve section sleeved in the hole of the extrusion type filament dividing plate 1 and a limiting section positioned outside the hole, wherein the sleeve section and the inner wall of the limiting section jointly form a through hole of the conical carbon fiber tendon 6, and the aperture of the conical through hole gradually contracts from the limiting section to the sleeve section. The extrusion type filament dividing plate 1 and the carbon fiber tendon 6 are separated by the aluminum protective shell 5, the carbon fiber tendon 6 is prevented from being in direct contact with the extrusion type filament dividing plate 1 by the aluminum protective shell 5, the carbon fiber tendon 6 is prevented from being damaged at the interface, and accordingly the whole anchoring bearing capacity is improved.
The wedge 4 is fixed to the end of each carbon fiber tendon 6 and the end of the carbon fiber tendon 6 is clamped in the aluminum protective shell 5. Specifically, the cross section of the wedge block 4 is in an isosceles acute triangle shape, the end part of each carbon fiber tendon 6 is split into a crack from the middle, the manufactured wedge block 4 is inserted into the crack, and the wedge block 4 and the carbon fiber tendons 6 are firmly bonded by glue.
Further, at the port of the enlarged end of the tapered inner wall 21 of the anchor cup 2, after the installation of the carbon fiber tendon 6 and the extrusion type filament dividing plate 1 is completed, sealing is performed by a sealing nut 8, preferably, an internal thread may be provided at the port of the enlarged end of the tapered inner wall, and the sealing nut 8 is screwed with the internal thread, thereby completing the connection.
The invention fully considers the defects of the existing carbon fiber tendon anchoring method, designs the carbon fiber tendon from the angles of simple design, reliable test data and wide applicability, and the specific carbon fiber tendon anchoring mode process is as follows:
fixing the bundled carbon fiber tows 6, and penetrating the anchor cup 2 through the carbon fiber tows 6;
installing extrusion type filament dividing plates 1, enabling carbon fiber tendons 6 to sequentially pass through holes corresponding to the extrusion type filament dividing plates 1, and enabling each carbon fiber tendon 6 to pass through an aluminum protective shell 5;
splitting a crack at the tail part of the carbon fiber tendon 6 from the middle position by using a blade, inserting the manufactured wedge block 4, and coating glue to tightly adhere the wedge block 4 and the carbon fiber tendon 6;
the aluminum protective shell 5 is clamped to the position with larger diameter of the carbon fiber tendon 6, and the extrusion type filament dividing plate 1 is pushed backwards, so that the aluminum protective shell 5 and the extrusion type filament dividing plate 1 are completely clamped;
the anchor cup 2 is moved backwards, so that the extrusion type wire dividing plate 1 is tightly contacted with the inner wall of the anchor cup 2;
and screwing a sealing nut 8, pouring epoxy iron sand 3 from the front end of the anchor cup 2 until the junction of the conical inner wall and the straight inner wall, and pouring low-modulus epoxy resin into the straight inner wall to finish the anchoring of the carbon fiber tendon.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the anchoring method, the tail parts of all carbon fiber tendons are inserted into the wedge blocks and bonded into a whole, and the extruded type filament dividing plate is used for clamping, so that all carbon fiber tendons can be simultaneously processed in the same tensioning state, and after being stressed, the stress levels of all carbon fiber tendons are close, so that the stress non-uniformity can be greatly reduced;
(2) An aluminum protective shell is adopted between the carbon fiber tendon and the extrusion type wire dividing plate, the modulus of the aluminum protective shell is far smaller than that of steel, and the aluminum protective shell has larger deformability, so that the carbon fiber tendon can be protected from being damaged, and the anchoring efficiency of the anchoring method can be improved;
(3) The front end of the anchor cup adopts the low-modulus epoxy resin, so that the stress concentration phenomenon at the front end of the anchor cup can be reduced, the carbon fiber tendons are prevented from being damaged in the anchor cup in advance, and the bearing capacity and the anchoring efficiency of the anchor are improved;
(4) The inner wall surface of the anchor cup is not a smooth surface, a deeper triangular groove is adopted, and the triangular groove is used for reducing the sliding quantity of the epoxy iron sand, so that the notch effect at the outlet of the anchor cup is reduced, and the aim of improving the anchoring efficiency is fulfilled;
(5) In conclusion, the anchor has reasonable form stress, simple structure, convenient processing and manufacturing, economy and reliability and stable anchoring effect, and can be used for anchoring carbon fiber tendons in various forms.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "vertical", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (4)
1. An anchoring system for carbon fiber tendons, comprising:
the anchor cup comprises an anchor cup body, wherein the inner wall of the anchor cup body is provided with a conical inner wall and a straight inner wall, the contraction end of the conical inner wall is connected with one end of the straight inner wall, epoxy iron sand is filled in the conical inner wall, and epoxy resin is filled in the straight inner wall;
the extrusion type wire dividing plate is clamped at the expansion end of the conical inner wall and provided with a plurality of holes which are in one-to-one correspondence with the carbon fiber tendons;
an aluminum protective shell sleeved between each carbon fiber tendon and the hole; the aluminum protective shell comprises a sleeve section sleeved in a hole of the extrusion type wire dividing plate and a limiting section positioned outside the hole, wherein the sleeve section and the inner wall of the limiting section jointly form a conical through hole of the carbon fiber tendon, and the diameter of the conical through hole gradually contracts from the limiting section to the sleeve section;
a wedge block fixed at the end part of each carbon fiber tendon and clamping the end part of each carbon fiber tendon in the aluminum protective shell; the cross section of the wedge block is in an isosceles acute triangle shape, the end part of each carbon fiber tendon is split into a crack from the middle position, and the wedge block is inserted into the crack and fixed by glue.
2. The anchoring system for carbon fiber tendons according to claim 1, further comprising a sealing nut, wherein a port of said enlarged end of said tapered inner wall is provided with internal threads and is screwed to said sealing nut.
3. The anchoring system for carbon fiber tendons according to claim 1, wherein the inner wall of the anchor cup is circumferentially arranged with a plurality of grooves.
4. A method for anchoring carbon fiber tows, realized based on the anchoring system for carbon fiber tows according to any one of claims 1 to 3, characterized by comprising the steps of:
the anchor cup passes through the bundled carbon fiber tendons;
sequentially passing carbon fiber tendons through holes corresponding to the extrusion type filament dividing plates, and passing an aluminum protective shell between each carbon fiber tendon and the corresponding hole;
splitting a crack at the end part of the carbon fiber tendon from the middle position, inserting a wedge block, and coating glue to bond and fix the wedge block and the carbon fiber tendon;
the aluminum protective shell is clamped to the position with larger diameter of the carbon fiber tendon, and the extrusion type filament separating plate is pushed backwards, so that the aluminum protective shell and the extrusion type filament separating plate are completely clamped;
moving the anchor cup backwards to enable the extrusion type wire dividing plate to be clamped with the conical inner wall of the anchor cup, and screwing a sealing nut on a port of the conical inner wall;
pouring epoxy iron sand from the front end of the anchor cup until the junction of the conical inner wall and the straight inner wall;
and (5) filling epoxy resin into the straight inner wall.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210010804.4A CN114351945B (en) | 2022-01-06 | 2022-01-06 | Anchoring system and method for carbon fiber tendons |
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| CN202210010804.4A CN114351945B (en) | 2022-01-06 | 2022-01-06 | Anchoring system and method for carbon fiber tendons |
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| CN114351945B true CN114351945B (en) | 2023-08-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6571518B1 (en) * | 1998-08-06 | 2003-06-03 | Anthony Donald Barley | Ground anchorage |
| CN107575257A (en) * | 2017-09-01 | 2018-01-12 | 哈尔滨工业大学 | Anchor tool system and its anchoring process for fibre-reinforced high molecular material bar |
| 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 |
| CN113802455A (en) * | 2021-08-31 | 2021-12-17 | 北京科技大学 | Anchor device for carbon fiber parallel inhaul cable and anchoring method thereof |
-
2022
- 2022-01-06 CN CN202210010804.4A patent/CN114351945B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6571518B1 (en) * | 1998-08-06 | 2003-06-03 | Anthony Donald Barley | Ground anchorage |
| CN107575257A (en) * | 2017-09-01 | 2018-01-12 | 哈尔滨工业大学 | Anchor tool system and its anchoring process for fibre-reinforced high molecular material bar |
| 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 |
| CN113802455A (en) * | 2021-08-31 | 2021-12-17 | 北京科技大学 | Anchor device for carbon fiber parallel inhaul cable and anchoring method thereof |
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| CN114351945A (en) | 2022-04-15 |
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