Anchorage device of carbon fiber reinforced composite inhaul cable and anchoring method of anchorage device

Abstract

The invention provides an anchorage device of a carbon fiber reinforced composite inhaul cable and an anchoring method of the anchorage device. The anchorage device comprises a first anchor cup, the first anchor cup is filled with an adhesive, and the adhesive is used for anchoring a plurality of inhaul cables penetrating through the adhesive in the first anchor cup; the second anchor cup is connected with the first anchor cup, the plurality of inhaul cables penetrate through the second anchor cup, a plurality of wedge-shaped clamping pieces are arranged in the second anchor cup, and the plurality of wedge-shaped clamping pieces are used for anchoring the plurality of inhaul cables penetrating through the plurality of wedge-shaped clamping pieces in the second anchor cup.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to an anchor of a carbon fiber reinforced composite cable and an anchoring method thereof. Background Art

[0002] Carbon Fibre-reinforced Polymer (CFRP) cables are increasingly being used in the field of bridge engineering due to their ultra-high strength, high elastic modulus, light weight and durability. Compared with traditional high-strength steel wire cables, CFRP cables not only have the advantages of light weight and high strength, but also have excellent corrosion resistance and fatigue resistance, which can also ensure the performance and service life of bridges under harsh natural environments and long-term reciprocating loads.

[0003] Due to the obvious anisotropic characteristics of CFRP materials, CFRP cables have high axial tensile strength, but their lateral shear resistance is relatively poor. The existing anchoring methods are still immature for the anchoring system of large-tonnage CFRP cables, and it is urgent to develop a new composite anchoring system for anchoring CFRP cables. Summary of the invention

[0004] In view of this, the present invention provides an anchor for a carbon fiber reinforced composite cable and an anchoring method thereof, so as to solve the problems of insufficient utilization of the bearing capacity of the CFRP cable and low cable anchoring efficiency.

[0005] On one hand, the present invention provides an anchor for a carbon fiber reinforced composite cable, comprising: a first anchor cup, the first anchor cup is filled with an adhesive, the adhesive is used to anchor multiple cables passing through the adhesive in the first anchor cup; a second anchor cup, the second anchor cup is connected to the first anchor cup, multiple cables pass through the second anchor cup, the second anchor cup is provided with multiple wedge-shaped clips, and the multiple wedge-shaped clips are used to anchor multiple cables passing through the multiple wedge-shaped clips in the second anchor cup.

[0006] According to an embodiment of the present invention, the first anchor cup comprises a first inner wall section, and the inner cross-sectional area of ​​the first inner wall section gradually decreases along the tension direction of the cable in the first anchor cup.

[0007] According to an embodiment of the present invention, the first anchor cup includes a second inner wall segment, the second inner wall segment is connected to the first inner wall segment, the inner cross-sectional areas of the second inner wall segments are equal, and the inner cross-sectional area of ​​the second inner wall segment is equal to the minimum inner cross-sectional area of ​​the first inner wall segment.

[0008] According to an embodiment of the present invention, the first inner wall segment includes an arc segment and a first straight cone segment, the arc segment connects the first straight cone segment, and the maximum inner cross-sectional area of ​​the arc segment is equal to the minimum inner cross-sectional area of ​​the first straight cone segment.

[0009] According to an embodiment of the present invention, the inner wall of the second anchor cup includes a second straight cone section, a plurality of wedge-shaped clips are spliced ​​into a truncated cone shape and arranged in the second straight cone section, and each cable is clamped between the side walls of two wedge-shaped clips.

[0010] According to an embodiment of the present invention, a circular arc notch is provided on the side wall of each wedge-shaped clip, the radius of the circular arc notch is equal to the outer diameter of the cable, and the radian of the circular arc notch is less than π.

[0011] According to an embodiment of the present invention, an internal thread is provided on the outlet end of the first anchor cup, and an external thread is provided on the inlet end of the second anchor cup, and the internal thread matches the external thread.

[0012] According to an embodiment of the present invention, the anchor also includes: a first wire dividing plate, which is arranged at the inlet end of the first anchor cup, the first wire dividing plate includes a plurality of first through holes, and the first wire dividing plate is used to divide the cable bundle to be anchored into a plurality of cables through the first through holes; a second wire dividing plate, which is arranged at the outlet end of the first anchor cup, the second wire dividing plate includes a plurality of second through holes, and the plurality of cables pass from the first anchor cup through the second through holes into the second anchor cup.

[0013] According to an embodiment of the present invention, the second wire dividing plate further includes a third through hole, and the third through hole is used to discharge the gas mixed in the adhesive to the outside of the first anchor cup.

[0014] On the other hand, the present invention also provides a method for anchoring a carbon fiber reinforced composite cable, comprising: passing multiple cables through a first anchor cup and a second anchor cup, and connecting the second anchor cup to the first anchor cup; injecting adhesive into the first anchor cup so that the adhesive wraps the multiple cables in the first anchor cup; installing multiple wedge-shaped clips in the second anchor cup so that the multiple wedge-shaped clips clamp the multiple cables in the second anchor cup.

[0015] According to the anchor of the carbon fiber reinforced composite cable and the anchoring method thereof provided by the embodiment of the present invention, the cable to be anchored is bonded and anchored by an adhesive, and is also clamped and anchored by a wedge-shaped clip, which has a double anchoring effect, fully utilizing the advantages of bonding anchoring and friction anchoring, and can improve the anchoring reliability and anchoring efficiency of the CFRP cable. The anchor of the carbon fiber reinforced composite cable and the anchoring method thereof provided by the embodiment of the present invention have the characteristics of strong operability of the anchoring method, simple structure, reasonable force, good safety, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 A cross-sectional view schematically shows an anchor of a carbon fiber reinforced composite cable according to an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of a cross-sectional view of an inner wall of a first anchor cup according to an embodiment of the present invention is shown;

[0019] Figure 3 Schematically shows a side view of a second anchor cup according to an embodiment of the present invention;

[0020] Figure 4 The flowchart schematically shows a method for anchoring a carbon fiber reinforced composite cable according to an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1-first anchor cup; 2-second anchor cup; 3-adhesive; 4-pull cable; 5-tightening ring; 6-first wire dividing plate; 7-second wire dividing plate; 8-wedge-shaped clip; 11-first inner wall section; 12-second inner wall section; 11a-inner wall of arc section; 11b-inner wall of straight cone section; 21-straight cone section; 211, 211'-arc notches; X-direction. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details do not have to be adopted to implement the present invention. In other examples, in order to avoid confusing the present invention, known structures, materials or methods are not specifically described.

[0024] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "in one embodiment," "in an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. In addition, it should be understood by those of ordinary skill in the art that the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0026] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0027] It should be emphasized that the anchor and anchoring method provided by the present invention can be used not only for carbon fiber reinforced composite cables, but also for cables made of other materials. Cables made of other materials using the anchor and anchoring method provided by the present invention should also be included in the protection scope of the present invention.

[0028] Figure 1 A cross-sectional view of an anchor of a carbon fiber reinforced composite cable according to an embodiment of the present invention is schematically shown.

[0029] like Figure 1 As shown, the anchor for the carbon fiber reinforced composite cable may include a first anchor cup 1 and a second anchor cup 2 .

[0030] The first anchor cup 1 is filled with adhesive 3. Adhesive 3 can be used to anchor multiple cables 4 passing through adhesive 3 in the first anchor cup 1. Adhesive 3 can be, for example, epoxy resin adhesive, which can be well bonded to CFRP cables. The second anchor cup 2 is connected to the first anchor cup 1, and multiple cables 4 pass through the second anchor cup 2. Multiple wedge-shaped clips 8 are provided in the second anchor cup 2. The multiple wedge-shaped clips 8 can be used to anchor multiple cables 4 passing through the multiple wedge-shaped clips 8 in the second anchor cup 2.

[0031] According to the anchor provided in the embodiment of the present invention, the cable 4 to be anchored is bonded and anchored by the adhesive 3, and is also clamped and anchored by the wedge-shaped clip 8, thereby achieving a double anchoring effect, making full use of the advantages of bonding anchoring and friction anchoring, and improving the anchoring reliability and anchoring efficiency of the CFRP cable 4.

[0032] Figure 2 The inner wall cross-sectional view of the first anchor cup 1 according to the embodiment of the present invention is schematically shown. It should be noted that in the present invention, the same parts in each figure are numbered the same.

[0033] like Figure 1 and Figure 2As shown, in some embodiments, the first anchor cup 1 may include a first inner wall segment 11, and the inner cross-sectional area of ​​the first inner wall segment 11 gradually decreases along the tension direction X of the cable 4 in the first anchor cup 1. In other words, at least one section of the cavity inside the first anchor cup 1 gradually shrinks along the tension direction X. From the opposite direction, it is a gradual expansion. When the cable 4 is pulled along the direction X, the force can be transmitted to the inner wall of the first anchor cup 1 through the adhesive 3, and a reaction force is provided by the continuously shrinking inner wall. The gradual reduction of the inner cross-sectional area can avoid the failure problem of the bonding surface between the inner wall of the first anchor cup 1, the adhesive 3 and the zipper 4, and improve the bonding reliability.

[0034] like Figure 1 and Figure 2 As shown, in some embodiments, the first anchor cup 1 may further include a second inner wall section 12, the second inner wall section 12 is connected to the first inner wall section 11, the inner cross-sectional areas of the second inner wall section 12 are equal, and the inner cross-sectional area of ​​the second inner wall section 12 is equal to the minimum inner cross-sectional area of ​​the first inner wall section 11. The second inner wall section 12 can be regarded as a straight section inner wall, that is, from a cross-sectional view, the straight section inner wall is parallel to the axis of the anchor and also parallel to the cable 4. The straight section inner wall can alleviate the stress concentration problem of the cable 4 in the first inner wall section 11.

[0035] like Figure 1 and Figure 2 As shown, in some embodiments, the first inner wall section 11 may include an arc segment inner wall 11a and a straight cone segment inner wall 11b. The arc segment inner wall 11a is connected to the straight cone segment inner wall 11b, and the maximum inner cross-sectional area of ​​the arc segment inner wall 11a is equal to the minimum inner cross-sectional area of ​​the straight cone segment inner wall 11b. That is to say, in this embodiment, the bonding anchoring area, that is, the inner wall of the first anchor cup 1, along the direction X of the cable 4, adopts a continuously changing three-section inner wall composed of an inner cone (straight cone segment inner wall 11b), an arc (arc segment inner wall 11a) and a cylinder (straight segment inner wall 12). Compared with the inner wall of the anchor being an inner cone or a straight cylinder, this embodiment can reduce the radial force on the CFRP tendons, is conducive to the uniform distribution of the radial force on the CFRP tendons, and alleviates the stress concentration problem of the CFRP tendons.

[0036] The arc radius of the arc segment inner wall 11a and the inclination angle of the straight cone segment inner wall 11b can be set according to actual conditions, and the present invention does not make specific limitations.

[0037] Figure 3 A side view of a second anchor cup 2 according to an embodiment of the present invention is schematically shown.

[0038] like Figure 1 and Figure 3As shown, the inner wall of the second anchor cup 2 includes a straight cone section 21. The straight cone section 21 of the second anchor cup 2 can be regarded as the second straight cone section, and the straight cone section 11b of the first anchor cup 1 can be regarded as the first straight cone section to avoid confusion. A plurality of wedge-shaped clips 8 are spliced ​​into a truncated cone shape and arranged in the straight cone section 21, and each cable 4 is clamped between the side walls of two wedge-shaped clips 8. Figure 1 From the cross-sectional view shown, the cross-sectional shape of each wedge-shaped clip 8 can be a trapezoid, with the narrow side of the trapezoid close to the first anchor cup 1 and the hypotenuse in contact with the straight tapered section 21 of the second anchor cup 2. The inclination angle of the hypotenuse of the trapezoid can be set to 10°, for example, but the present invention is not limited thereto. Figure 3 From the cross-sectional view shown, the cross-sectional shape of each wedge-shaped clip 8 can be a sector. The cable 4 is clamped between two sectors. When the cable 4 is pulled, the wedge-shaped clip 8 clamps the cable 4, and transmits the force to the straight tapered section 21 of the second anchor cup 2 through the hypotenuse of the wedge-shaped clip 8, thereby achieving the anchoring of the cable 4 in the second anchor cup 2.

[0039] The number of wedge-shaped clamps 8 can be determined according to the number of cables 4 to be clamped. To ensure good clamping and force-bearing effects, the number of wedge-shaped clamps 8 can be equal to the number of cables 4, thereby ensuring that there is only one cable 4 between every two wedge-shaped clamps 8.

[0040] Please continue reading Figure 3 In some embodiments, each wedge-shaped clamp 8 is provided with an arc notch 211, 211' on its side wall, the radius of the arc notch 211, 211' is equal to the outer diameter of the cable 4, and the arc of the arc notch 211, 211' is less than π. In this way, the cable 4 can fit tightly in the arc notch 211, 211', and a certain size of gap can be formed between the arc notches 211, 211'. The tighter the cable 4 is pulled, the smaller the spacing of the gap is, and the arc notches 211, 211' can clamp the cable 4 more firmly.

[0041] Please continue reading Figure 1 In some embodiments, an internal thread is provided on the outlet end of the first anchor cup 1, and an external thread is provided on the inlet end of the second anchor cup 2, and the internal thread matches the external thread. The first anchor cup 1 and the second anchor cup 2 can be regarded as a whole, the first anchor cup 1 can be used as the front part of the anchor cup, and the second anchor cup 2 can be used as the rear part of the anchor cup. The rear part of the anchor cup and the front part of the anchor cup are connected together by external threads and internal threads, which is convenient for installation, can ensure the reliability of the connection between the two, and can also reduce the number of parts.

[0042] Please continue reading Figure 1The anchor may further include a first wire dividing plate 6 and a second wire dividing plate 7. The first wire dividing plate 6 may be disposed at the inlet end of the first anchor cup 1, and the first wire dividing plate 6 includes a plurality of first through holes (not shown in the figure), and the first wire dividing plate 6 is used to divide the cable bundle to be anchored into a plurality of cables 4 through the first through holes. For example, a cable bundle is composed of three cables, and the three first through holes on the first wire dividing plate 6 may be used to disperse the cable bundle into three independent cables and pass them into the anchor cup. The number of the first through holes may be equal to the number of cables 4 in the first anchor cup 1, and the aperture of the first through hole may be slightly larger than the outer diameter of a single cable, so as to facilitate the cable to pass through the through hole.

[0043] The second wire splitter plate 7 is arranged at the outlet end of the first anchor cup 1, and the second wire splitter plate 7 includes a plurality of second through holes (not shown in the figure), and a plurality of cables 4 pass through the second through holes from the first anchor cup 1 into the second anchor cup 2. The number of the second through holes can be equal to the number of cables 4 in the first anchor cup, and the aperture of the second through hole can be slightly larger than the outer diameter of a single cable, so that the cable can pass through the through hole. The second through hole has a one-to-one correspondence with the first through hole, ensuring that each cable 4 in the first anchor cup 1 is parallel to the axis of the first anchor cup 1.

[0044] In some embodiments, the second wire dividing plate 7 may further include a third through hole (not shown in the figure), which is used to discharge the gas mixed in the adhesive 3 to the outside of the first anchor cup 1, thereby ensuring that the adhesive 3 fully wraps each cable 4 and improves the bonding reliability. The aperture of the third through hole does not need to be too large, as long as it can discharge air. An excessively large aperture may cause the adhesive 3 to be squeezed out of the third through hole.

[0045] Please continue reading Figure 1 The anchor may further include a clamping ring 5, which may be used to clamp the first wire dividing plate 6 and the adhesive 3 in the first anchor cup 1.

[0046] Based on the anchor of the carbon fiber reinforced composite cable of the above embodiment, the present invention also provides an anchor method of the anchor. The anchor method has the same technical features and beneficial effects as the anchor, which will not be described in detail here.

[0047] Figure 4 The flowchart schematically shows a method for anchoring a carbon fiber reinforced composite cable according to an embodiment of the present invention.

[0048] like Figure 4 As shown, the method for anchoring a carbon fiber reinforced composite cable may include steps S10 to S30.

[0049] In step S10 , a plurality of cables 4 are passed through the first anchor cup 1 and the second anchor cup 2 , and the second anchor cup 2 is connected to the first anchor cup 1 .

[0050] In step S20 , the adhesive 3 is injected into the first anchor cup 1 , so that the adhesive 3 wraps the plurality of cables 4 in the first anchor cup 1 .

[0051] In step S30 , a plurality of wedge-shaped clips 8 are installed in the second anchor cup 2 , so that the plurality of wedge-shaped clips 8 clamp the plurality of cables 4 in the second anchor cup 2 .

[0052] As an example, the above steps S10 to S30 can be implemented as follows: It can be understood that the following specific operation steps are only examples to facilitate understanding of the anchoring process of the anchor provided by the present invention, and do not constitute further limitation of the present invention.

[0053] like Figure 1 As shown, first, the ends of the carbon fiber reinforced composite cable bundle can be untied, and a single cable 4 passes through the clamping ring 5 and the first wire dividing plate 6 in sequence, and the other end of the cable 4 is anchored on the second wire dividing plate 7. After the carbon fiber composite cable 4 is arranged, the first anchor cup 1 can be kept in an upright state, and the epoxy resin adhesive 3 can be injected from the injection hole on the first wire dividing plate 6, and slightly vibrated to compact, and the air is discharged from the pores of the second wire dividing plate 7, so that the epoxy resin adhesive 3 fully wraps the carbon fiber composite cable 4. After the bonding anchoring area in the first anchor cup 1 is filled with adhesive 3, the clamping ring 5 can be pressed to wait for the epoxy resin adhesive 3 in the first anchor cup 1 to solidify. Finally, tighten the second anchor cup 2, install the wedge-shaped clip 8, and complete the anchoring.

[0054] In summary, the present invention proposes an anchoring system for a carbon fiber composite cable, which makes full use of the advantages of bonding anchoring and friction anchoring, and further improves the anchoring efficiency through double anchoring. The inner wall of the bonding anchoring area adopts a continuously changing three-section inner wall composed of an inner cone, an arc and a cylinder along the direction of the cable. Compared with the inner wall of the anchor being in the form of an inner cone or a straight cylinder, the radial force on the CFRP tendons can be reduced, which is beneficial to the uniform distribution of the radial force on the CFRP tendons and alleviates the stress concentration problem of the CFRP tendons. The CFRP cable anchoring system provided by the present invention has the characteristics of strong operability of the anchoring method, simple structure, reasonable force, good safety and high reliability.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and the scope of the present invention is defined by the claims and their equivalents. It will be understood by those skilled in the art that the features described in the various embodiments of the present invention and / or the claims may be combined in various combinations and / or combinations, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments of the present invention and / or the claims may be combined in various combinations and / or combinations without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. An anchor for a carbon fiber reinforced composite cable, characterized in that: include: a first anchor cup, wherein the first anchor cup is filled with an adhesive, and the adhesive is used to anchor a plurality of cables passing through the adhesive in the first anchor cup; A second anchor cup, wherein the second anchor cup is connected to the first anchor cup, the plurality of cables pass through the second anchor cup, and a plurality of wedge-shaped clips are arranged in the second anchor cup, and the plurality of wedge-shaped clips are used to anchor the plurality of cables passing through the plurality of wedge-shaped clips in the second anchor cup.

2. The anchor according to claim 1, characterized in that: The first anchor cup comprises a first inner wall section, and along the tension direction of the cable in the first anchor cup, the inner cross-sectional area of ​​the first inner wall section gradually decreases.

3. The anchor according to claim 2, characterized in that: The first anchor cup includes a second inner wall segment, the second inner wall segment is connected to the first inner wall segment, the inner cross-sectional areas of the second inner wall segments are equal, and the inner cross-sectional area of ​​the second inner wall segment is equal to the minimum inner cross-sectional area of ​​the first inner wall segment.

4. The anchor according to claim 2, characterized in that: The first inner wall section includes an arc section and a first straight cone section, the arc section connects the first straight cone section, and the maximum inner cross-sectional area of ​​the arc section is equal to the minimum inner cross-sectional area of ​​the first straight cone section.

5. The anchor according to claim 1, characterized in that: The inner wall of the second anchor cup includes a second straight cone section, the plurality of wedge-shaped clips are spliced ​​into a truncated cone shape and arranged in the second straight cone section, and each of the cables is clamped between the side walls of two of the wedge-shaped clips.

6. The anchor according to claim 5, characterized in that: A circular arc notch is arranged on the side wall of each of the wedge-shaped clips, the radius of the circular arc notch is equal to the outer diameter of the cable, and the radian of the circular arc notch is less than π.

7. The anchor according to claim 1, characterized in that: The outlet end of the first anchor cup is provided with an internal thread, and the inlet end of the second anchor cup is provided with an external thread, and the internal thread matches the external thread.

8. The anchor according to claim 1, characterized in that: The anchor also includes: A first wire dividing plate, arranged at the inlet end of the first anchor cup, the first wire dividing plate comprising a plurality of first through holes, and the first wire dividing plate is used to divide the cable bundle to be anchored into the plurality of cables through the first through holes; The second wire dividing plate is arranged at the outlet end of the first anchor cup. The second wire dividing plate comprises a plurality of second through holes. The plurality of cables pass through the second through holes from the first anchor cup and enter the second anchor cup.

9. The anchor according to claim 8, characterized in that The second wire dividing plate further includes a third through hole, and the third through hole is used to discharge the gas mixed in the adhesive to the outside of the first anchor cup.

10. A method for anchoring a carbon fiber reinforced composite cable, characterized in that: include: Passing a plurality of cables through a first anchor cup and a second anchor cup, wherein the second anchor cup is connected to the first anchor cup; Injecting adhesive into the first anchor cup so that the adhesive wraps the plurality of cables in the first anchor cup; A plurality of wedge-shaped clips are installed in the second anchor cup so that the plurality of wedge-shaped clips clamp the plurality of cables in the second anchor cup.

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