Self-cleaning reusable general anchoring sleeve for composite material ribs and working method of self-cleaning reusable general anchoring sleeve

Abstract

The invention relates to the technical field of rib material connection, in particular to a self-cleaning reusable composite material rib general anchoring sleeve and a working method. Comprising a first sleeve, a second sleeve and a third sleeve, a cavity is formed in the first sleeve, through holes penetrating through the cavity are formed in the two ends of the first sleeve, an FRP rib penetrates into the cavity from one through hole, and the other through hole is connected with an end anchorage device through a bolt; and the connecting sleeve is detachably connected with the first sleeve and the FRP rib in the inserting direction. According to the invention, by utilizing the arranged drawing device, the composite material rib material in the first sleeve and the connecting sleeve can be separated from the anchoring colloid, the first sleeve and the connecting sleeve can be repeatedly used after being cleaned, and compared with the traditional technology, the material consumption and the experiment cost are obviously reduced. According to the invention, the first sleeve is combined with the connecting sleeve, so that the glue injection anchoring length can be flexibly adjusted according to the diameter and the type of a to-be-tested composite material rib material, and diversified test requirements can be met.

Description

Technical Field

[0001] The invention relates to the technical field of reinforcement connection, and in particular to a self-cleaning and reusable universal anchor sleeve for composite reinforcement and a working method. Background Art

[0002] Fiber reinforced composite bars (FRP) are a new type of material that is lightweight, high-strength, and corrosion-resistant. They can eliminate structural damage caused by corrosion by chloride ions and chemicals in harsh environments. Currently, FRP materials have gradually replaced steel bars and are used in coastal structures and bridge projects. Compared with traditional steel bars, the tensile strength of FRP bars has been significantly improved and the failure characteristics are completely different. Therefore, special experimental equipment is often required to test the tensile strength of FRP bars.

[0003] The existing FRP tendon tensile test equipment is not universal, and most of the experiments are disposable consumables. In the test, the colloid and the tendon often fall out due to insufficient anchoring length. Therefore, a universal glue anchor sleeve for various FRP tendons is designed to be reusable to greatly reduce the experimental cost. Summary of the invention

[0004] In view of the problems mentioned in the prior art, the present invention proposes a self-cleaning and reusable universal anchor sleeve for composite material bars and a working method, which can be reused and can adapt to FRP bars of different diameters.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: The present invention discloses a self-cleaning and reusable universal anchor sleeve for composite reinforcement, comprising: The first sleeve has a chamber formed inside and through holes penetrating the chamber are provided at both ends. The FRP bar is inserted into the chamber through one of the through holes, and the other through hole is connected to the end anchor; A connecting sleeve is detachably connected to the first sleeve and the direction in which the FRP reinforcement is inserted, wherein a plurality of connecting sleeves may be provided.

[0006] As a further improvement of the present invention, the first sleeve is provided with a heating element and a memory metal layer in sequence from the outside to the inside, wherein the memory metal layer is provided with a memory metal thread.

[0007] As a further improvement of the present invention, a glue injection hole is further provided on the first sleeve, and a glue injection cap is provided on the glue injection hole.

[0008] As a further improvement of the present invention, it also includes a centering pad, wherein the centering pad is arranged in the first sleeve and connected to the sleeve bolt, and the sleeve bolt is connected to the end anchor.

[0009] As a further improvement of the present invention, a fixing plug-in is provided at one end of the connecting sleeve to realize the connection between the first sleeve and the connecting sleeve, wherein the connecting sleeve is provided with a heating element and a memory metal layer from the outside to the inside, and the memory metal layer is provided with a memory metal thread; the memory metal layer is also provided with a lock for connecting the connecting sleeve to the first sleeve.

[0010] As a further improvement of the present invention, both the first sleeve and the connecting sleeve are provided with connecting fixing holes.

[0011] As a further improvement of the present invention, it also includes a centering cap, and the end of the connecting sleeve away from the first sleeve is detachably connected to the centering cap.

[0012] As a further improvement of the present invention, the end anchor is a wedge-shaped block, wherein an anchor through hole is opened in the middle of the end anchor.

[0013] As a further improvement of the present invention, it also includes a pulling device, which is used to separate the colloid and the memory metal layer in the first sleeve and the connecting sleeve after the experiment is completed, and pull out the FRP tendon.

[0014] A working method of a self-cleaning and reusable universal anchor sleeve for composite reinforcements: connecting a first sleeve with a connecting sleeve, inserting an FRP reinforcement into the first sleeve and connecting the connecting sleeve with a centering pad, installing a centering cap on the end of the connecting sleeve to achieve sealing; injecting colloid into the first sleeve through a glue injection hole, and starting a pulling test after curing for several days; installing an end anchor on the end of the first sleeve through bolts, pulling a memory metal layer by a pulling device, pulling the memory metal thread of the memory metal layer into a flat state, so that the colloid in the first sleeve and the connecting sleeve is separated from the memory metal layer, cleaning the residual colloid in the first sleeve and the connecting sleeve, heating the first sleeve and the inside of the connecting sleeve by a heating element, restoring the memory metal layer to its original state, so as to achieve reuse.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: The present invention utilizes a pulling device to separate the colloid and the memory metal layer in the first sleeve and the connecting sleeve. The first sleeve and the connecting sleeve can be reused after being cleaned. Compared with traditional technologies, material consumption and experimental costs are significantly reduced.

[0016] The present invention combines the first sleeve with the connecting sleeve, and can flexibly adjust the injection anchoring length according to the diameter and type of the FRP bar to be tested to meet diverse experimental needs; the centering pad and the centering cap can ensure that the FRP bar is always centered with the first sleeve, effectively eliminating position deviation and improving the accuracy and reliability of experimental data. In addition, the centering pad can be adjusted according to the diameter of the FRP bar to adapt to FRP bars of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the first sleeve structure of the present invention; Figure 2 It is a schematic diagram of the connecting sleeve of the present invention; Figure 3 It is a schematic diagram of the centering gasket of the present invention; Figure 4 It is a schematic diagram of the sleeve cap of the present invention; Figure 5 It is a schematic diagram of the overall assembly of the present invention; Figure 6 It is a schematic diagram of the lock structure of the present invention; Figure 7 It is a schematic diagram of the end anchor of the present invention; Figure 8 It is a schematic diagram of the experimental process of the present invention; Fig. 9 This is a schematic diagram of the card structure of the present invention; Fig.10 It is a schematic diagram of the post-experimental drawing device of the present invention; Fig.11 Another structural schematic diagram of the centering gasket of the present invention; Fig.12 This is a structural schematic diagram of Example 2 of the present invention.

[0018] Reference numerals: 1, sleeve bolt; 2, centering pad; 3, glue injection hole; 4, glue injection cap; 5, heating element; 6, connection and fixing hole; 7, memory metal interface; 8, memory metal layer; 9, memory metal thread; 10, first sleeve; 11, centering bolt; 12, fixing plug-in; 13, lock; 14, connecting sleeve; 15, centering screw hole; 16, centering cap; 17, FRP rib passing hole; 18, thread; 22, first spring; 23. Second spring; 24. Baffle; 25. Lock pin; 26. Shell; 27. Connecting block; 28. End anchor; 29. ​​Anchor through hole; 30. Sleeve nut; 31. Base; 32. Fixing plate; 33. Card; 34. Pull rope; 35. Winch; 36. Disposable inner cavity; 37. Outer wall of sleeve; 38. High-strength spring; 39. Protrusion; 40. Memory metal layer passing through layer; 41. Hook; 42. Groove; 43. Locking rod. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0027] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1 The present invention discloses a self-cleaning and reusable universal anchor sleeve for composite reinforcement, comprising: a first sleeve 10, wherein a chamber is formed inside the first sleeve 10, through holes penetrating the chamber are provided at both ends, an FRP reinforcement is inserted into the chamber through one of the through holes, and the other through hole is connected to an end anchor 28 through a sleeve bolt 1; a connecting sleeve 14, wherein the connecting sleeve 14 is detachably connected to the first sleeve 10 and the direction in which the FRP reinforcement is inserted, wherein a plurality of connecting sleeves 14 may be provided, or the connecting sleeve 14 may be provided or not provided according to actual needs.

[0030] Reference Figure 1 It is a structural diagram of the first sleeve 10 in the embodiment. Through holes are provided at both ends of the first sleeve 10. One of the through holes is provided with a threaded channel along the internal chamber. The threaded channel is connected to the sleeve bolt 1. The function of the sleeve bolt 1 in the embodiment is to connect the first sleeve 10 with the end anchor 28; the bottom of the sleeve bolt 1 is in tight contact with the centering pad 2 provided in the first sleeve 10. When the FRP bar is inserted into the first sleeve 10, the centering pad 2 can be used to achieve complete centering of the FRP bar in the first sleeve 10 to prevent position deviation.

[0031] In the embodiment, a bolt hole is provided at the position where the centering pad 2 is provided in the first sleeve 10, wherein the bolt hole is used for inserting a centering bolt 11 connected to the centering pad 2. Figure 3 As shown, the centering pad 2 in the embodiment is annular and is preferably made of hard rubber.

[0032] There are two structures of the centering pad in the embodiment, such as Figure 3 As shown, the centering pad 2 is preferably provided with four centering screw holes 15 along the radial direction of the circular ring, and the centering screw holes 15 match the centering bolts 11. When the FRP bar is inserted into the centering pad 2 through the first sleeve 10, the centering bolts 11 are screwed into the first sleeve 10 through the centering screw holes 15 to realize the centering of the FRP bar in the first sleeve 10. At the same time, the screwing depth of the centering bolts 11 can be adjusted according to the diameter of the FRP bar, so that the screwing depths of the four centering bolts 11 are the same, thereby achieving a centering effect, thereby adapting to FRP bars of different diameters.

[0033] Implementation example Fig.11 As shown, three identical high-strength springs 38 are provided in the centering pad 2, and a hook 41 is connected to the end of each high-strength spring 38. When the FRP tendon is inserted into the centering pad, the three high-strength springs 38 with the same structure in a compressed state are stretched so that the hooks 41 connected to their respective ends hook the FRP tendon and stretch the three high-strength springs 38. The tension of the three high-strength springs 38 causes the FRP tendon to move to the center position.

[0034] Figure 1 As shown, in the embodiment, a glue injection hole 3 is opened on the first sleeve 10, wherein the glue injection hole 3 is specifically arranged on the bolt side of the first sleeve 10, and the glue injection hole 3 is provided to facilitate the injection of glue into the first sleeve 10, and the glue injection hole 3 is connected with a glue injection cap 4, and the glue injection cap 4 in the embodiment has two functions, the first is that when the heating element 5 is heated, it can seal and insulate the inner cavity of the first sleeve 10; the second is that when the equipment is in the storage state, the glue injection cap 4 is covered on the glue injection hole 3 to achieve sealing, so as to prevent dust from entering the first sleeve 10.

[0035] like Figure 1As shown, in the embodiment, a memory metal layer 8 is provided on the inner wall of the first sleeve 10 near one end of the internal cavity, and the side of the memory metal layer 8 near the centering pad 2 is fixedly connected to the inner cavity wall of the first sleeve 10, and a memory metal thread 9 is provided along the length direction of the memory metal layer 8; a heating element 5 is provided between the inner wall of the first sleeve 10 and the outer wall of the first sleeve 10, and the memory metal layer 8 and the memory metal thread 9 are heated by the heating element 5, so that the memory metal layer 8 and the memory metal thread 9 are restored to their original state. After the experiment is completed, the memory metal thread 9 and the memory metal layer 8 are flattened by a drawing device, and after cleaning, they are heated by the heating element 5. When the temperature rises, the memory metal thread 9 and the memory metal layer 8 are restored to their original state and can be reused for the next experiment; in the embodiment, the right end of the memory metal layer 8 extends out of the first sleeve 10, and a memory metal interface 7 is provided on the extended part, which is used in conjunction with the lock buckle 13 to connect the memory metal layer 8 in the first sleeve 10 with the memory metal layer 8 in the connecting sleeve 14; in the embodiment, the heating element 5 is preferably a heating resistance wire.

[0036] In the embodiment, the through hole at the right end of the first sleeve 10 is connected to the fixing plug-in 12 on the connecting sleeve 14 through the connecting fixing hole 6, wherein the connecting fixing hole 6 and the fixing plug-in 12 are both provided with vertical threaded holes, and the fixing plug-in 12 is inserted into the connecting fixing hole 6, and the two are connected by bolts, so that the first sleeve 10 is connected to the connecting sleeve 14. After the experiment is completed and the inside of the sleeve is cleaned, the bolts are removed to separate the first sleeve 10 from the connecting sleeve 14; in the embodiment, the connecting sleeve 14 can be connected to different numbers of connecting sleeves 14 according to the different lengths of the FRP bars, and the end of the last connecting sleeve 14 is connected to a centering cap.

[0037] Figure 2 FIG. 1 is a schematic diagram of a connecting sleeve. In the embodiment, the length of the connecting sleeve 14 is less than the length of the first sleeve 10. In the embodiment, the connecting sleeve 14 can be connected to multiple sleeves for use. The number of connecting sleeves 14 is set according to actual needs. The structure of the connecting sleeve 14 is basically the same as that of the first sleeve 10. The difference is that, first, a fixing plug-in 12 is provided at the left end of the connecting sleeve 14 for connecting with the first sleeve 10, and second, a lock buckle 13 is provided inside the connecting sleeve 14. The specific structure of the lock buckle 13 in the embodiment is as shown in FIG. Figure 6As shown, the lock buckle 13 includes a first spring 22, a second spring 23, a baffle 24, a lock pin 25, and a shell 26, wherein the first spring 22 is vertically connected to the top of the lock buckle 13 body, and the other end of the first spring 22 is connected to the lock pin 25 through a connecting block 27. The lock pin 25 is contacted with the baffle 24, and the baffle 24 provides support for the lock pin 25. In the embodiment, the size of the lock pin 25 matches the diameter of the memory metal interface 7. The right end of the baffle 24 is connected to the lock buckle 13 body through the second spring 23, and the left end of the baffle 24 is provided with a shell 26. An entry hole for the memory metal interface 7 to extend into the lock buckle 13 is provided between the shells 26, and the first spring 22 is made of memory metal material.

[0038] The specific usage is: when the first sleeve 10 is connected to the connecting sleeve 14, the memory metal interface 7 of the first sleeve 10 enters into the main body of the lock buckle 13 from the entry hole, and the memory metal interface 7 pushes the baffle 24. At this time, the second spring 23 will be compressed. During the pushing process, the baffle 24 cannot provide support for the locking pin 25, so that the first spring 22 pops out and pushes the locking pin 25 down, so that the locking pin 25 falls into the hole opened on the memory metal interface 7, thereby connecting the first sleeve 10 with the connecting sleeve 14. After the test is completed, the heating element 5 heats the inner cavity of the first sleeve 10 and the connecting sleeve 14 to retract the first spring 22, pull the locking pin 25 and the baffle 24 to reset, and then make the device reusable.

[0039] like Figure 4 As shown, the centering cap 16 in the embodiment is provided with an FRP rib passing hole 17 and a thread 18 on the surface. When in use, the FRP rib is passed through the FRP rib passing hole 17, and the centering cap is connected to the memory metal interface 7 of the connecting sleeve 14 through the thread 18, and acts simultaneously with the centering pad 2, so that the FRP rib is completely centered inside the sleeve.

[0040] like Figure 7 As shown, the end anchor 28 in the embodiment is wedge-shaped and is preferably made of steel. An anchor through hole 29 is provided in the middle of the end anchor 28. The first sleeve 10 passes through the anchor through hole 29. The end anchor 28 and the first sleeve 10 are connected as a whole by using a sleeve bolt 1 and a sleeve nut 30.

[0041] like Fig. 9 and Fig.10As shown, the pulling device in the embodiment is composed of a fixing plate 32, a base 31, a winch 35, and a card 33, wherein the fixing plate 32 is fixedly arranged on the base 31, the fixing plate 32 and the base 31 are connected by a fixing bolt, the fixing plate 32 is provided with a through hole for the sleeve bolt 1 of the first sleeve 10 to pass through, the first sleeve 10 and the connecting sleeve 14 connected to the first sleeve 10 are fixed to the fixing plate 32 by matching bolts and nuts, a winch 35 is provided at one end of the base 31 away from the fixing plate 32, the winch 35 is connected to a pull rope 34, the pull rope 34 is connected to the card 33, and is connected to the first sleeve 10 (the connecting sleeve 14 is not provided) or the outermost connecting sleeve 14 through the card 33.

[0042] In the embodiment, the card 33 is structured as follows Fig. 9 As shown, the card 33 is made of steel, the card 33 is a round steel sheet, and is also provided with a memory metal layer passing through the layer 40. The outer surface of the card 33 is provided with a hanging ring (not shown in the figure), which is connected to the pull rope 34 through the hanging ring; the card 33 is radially provided with a locking rod 43, and preferably 4 locking rods 43 are provided in the embodiment. The locking rod 43 is connected to the memory metal interface 7 on the connecting sleeve 14. When the memory metal interface 7 passes through the memory metal layer passing through the layer 40, the memory metal layer 8 is connected to the card 33 as a whole through the locking rod 43.

[0043] When the embodiment is used, one end of the first sleeve 10 is fixed on the fixing plate 32, and the other end of the first sleeve 10 is connected to the connecting sleeve 14. The last connecting sleeve 14 is connected to the card 33, and is connected to the memory metal interface 7 on the connecting sleeve 14 through the locking rod 43 provided on the card 33 to achieve fixation. The winch 35 is opened, and the pull rope 34 is driven by the winch 35. The pull rope 34 drives the card 33 and the memory metal layer 8 connected to the card 33, so that the memory metal layer 8 is in a flat state, which can destroy the bonding colloid between the FRP tendon and the memory metal layer 8, so that the FRP tendon can be removed from the first sleeve 10 and the connecting sleeve 14.

[0044] The use process of the present invention is: insert the fixing plug-in 12 of the connecting sleeve 14 into the connecting fixing hole 6 of the first sleeve 10, and use bolts to connect the connecting sleeve 14 to the first sleeve 10; in addition, the memory metal interface 7 provided on the memory metal layer 8 in the first sleeve 10 is connected to the lock buckle 13 in the connecting sleeve 14, when the memory metal interface 7 enters the lock buckle 13 from the entry hole, the memory metal interface 7 pushes the baffle 24, at this time the second spring 23 will be compressed, and during the pushing process, the baffle 24 cannot provide support for the lock pin 25, so that the first spring 22 pops out and pushes the lock pin 25 down, so that the lock pin 25 falls into the memory metal interface 7, thereby connecting the first sleeve 10 and the connecting sleeve 14 as a whole, and the connected state is as follows: Figure 5 shown.

[0045] Insert one end of the FRP bar into the first sleeve 10 and the connecting sleeve 14, and the other end into another first sleeve 10 and the connecting sleeve 14. The middle part of the FRP bar outside the first sleeve 10 and the connecting sleeve 14 is the test section, and the length of the test section is not less than 380 mm and 40 times the effective diameter of the bar.

[0046] Insert the FRP rib into the centering pad 2 in the first sleeve 10 to center it, install the centering cap 16 on the end of the connecting sleeve 14, open the glue injection cap 4 on the first sleeve 10, and inject colloid (preferably epoxy resin) into the first sleeve 10 through the glue injection hole 3. When the colloid is filled, cover the glue injection cap 4 to seal it and perform curing. After the curing is completed, prepare for the pulling test.

[0047] like Figure 8 As shown, the end anchors 28 are installed at both ends of the two first sleeves 10, and the end anchors 28 are fixed by sleeve bolts 1 and matching sleeve nuts 30 provided at both ends of the first sleeves 10, and the equipment is placed in the testing machine to start the pull-out test.

[0048] During the pull-out test, the FRP bar test section will be broken under the action of external force, and the test result of the FRP bar will be obtained. When the pull-out test is completed, one of the two broken sections, the first sleeve 10, is installed on the fixing plate 32 through the sleeve bolt 1 and fixedly connected by nuts and bolts. The memory metal interface 7 of the connecting sleeve 14 is connected to the card 33 through the locking rod 43, so that the memory metal layer 8 of the connecting sleeve 14 is connected to the card 33. The winch 35 is turned on, and the winch 35 pulls the pull rope 34, and the pull rope 34 pulls the memory metal layer 8 in the connecting sleeve 14 to a flat state. The connecting sleeve 14 is connected to the first sleeve 10, and the memory metal layer 8 in the first sleeve 10 is also pulled into a flat state. At this time, the colloid material in the inner cavity of the connecting sleeve 14 and the first sleeve 10 is broken, the FRP tendons and residual colloid are pulled out, and the residual colloid in the first sleeve 10 and the connecting sleeve 14 is cleaned. After cleaning, the heating element 5 is turned on, so that the memory metal layer 8 in the first sleeve 10 and the connecting sleeve 14 is restored to its original state with the first spring 22 in the lock buckle 13 at high temperature, and the memory metal layer 8 forms the memory metal thread 9 again, and the first spring 22 retracts, so that the lock buckle 13 is reset.

[0049] The first sleeve 10 and the connecting sleeve 14 are cleaned again, and the above experiment is repeated to achieve reuse.

[0050] Example 2 This embodiment is basically the same as the first embodiment, except that this embodiment proposes another new structure of the first sleeve and the connecting sleeve, such as Fig.12As shown, the first sleeve and the connecting sleeve are composed of a sleeve outer wall 37 and a disposable inner cavity 36 arranged in the sleeve outer wall 37, wherein four grooves 42 are radially spaced on the sleeve outer wall 37, and the disposable inner cavity 36 is provided with four protrusions 39 corresponding to the sleeve outer wall 37, and the protrusions 39 are connected to the grooves 42 by bolts. When in use, it is only necessary to insert the disposable inner cavity 36 along the grooves 42 of the sleeve outer wall 37 and connect the grooves 42 with the protrusions 39 by bolts. When the experiment is over, the bolts are unscrewed and the disposable inner cavity 36 is taken out, so that the sleeve outer wall 37 can be recycled for multiple times.

[0051] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0052] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A self-cleaning and reusable universal anchor sleeve for composite reinforcement, characterized in that: include: A first sleeve (10) has a chamber formed inside thereof, through holes penetrating the chamber are provided at both ends, the FRP bar penetrates into the chamber through one of the through holes, and the other through hole is connected to an end anchor (28); A connecting sleeve (14) is detachably connected to the first sleeve (10) and the direction in which the FRP bar is inserted, wherein a plurality of connecting sleeves (14) may be provided.

2. According to claim 1, a self-cleaning and reusable universal anchor sleeve for composite reinforcement, characterized in that: The first sleeve (10) is provided with a heating element (5) and a memory metal layer (8) in sequence from the outside to the inside, wherein the memory metal layer (8) is provided with a memory metal thread (9).

3. The self-cleaning and reusable universal anchor sleeve for composite reinforcement according to claim 2, characterized in that: The first sleeve (10) is also provided with a glue injection hole (3), and the glue injection hole (3) is provided with a glue injection cap (4).

4. The self-cleaning and reusable universal anchor sleeve for composite reinforcement according to claim 3, characterized in that: It also includes a centering pad (2), wherein the centering pad (2) is arranged in the first sleeve (10) and connected to the sleeve bolt (1), and the sleeve bolt (1) is connected to the end anchor (28).

5. The self-cleaning and reusable universal anchor sleeve for composite reinforcement according to claim 1, characterized in that: A fixing plug-in (12) is provided at one end of the connecting sleeve (14), wherein the connecting sleeve (14) is provided with a heating element (5) and a memory metal layer (8) in sequence from the outside to the inside, and a memory metal thread (9) is provided on the memory metal layer (8); The memory metal layer (8) is also provided with a lock buckle (13) for connecting the connecting sleeve (14) to the first sleeve (10).

6. The self-cleaning and reusable universal anchor sleeve for composite reinforcement according to claim 1, characterized in that: The first sleeve (10) and the connecting sleeve (14) are both provided with connecting fixing holes (6).

7. The self-cleaning and reusable universal anchor sleeve for composite reinforcement according to claim 1, characterized in that: It also includes a centering cap (16), and one end of the connecting sleeve (14) away from the first sleeve (10) is detachably connected to the centering cap.

8. The self-cleaning and reusable universal anchor sleeve for composite reinforcement according to claim 1, characterized in that: The end anchor (28) is a wedge-shaped block, wherein an anchor through hole (29) is provided in the middle of the end anchor (28).

9. The self-cleaning and reusable universal anchor sleeve for composite reinforcement according to claim 1, characterized in that: It also includes a pulling device, which is used to separate the colloid and the memory metal layer in the first sleeve (10) and the connecting sleeve (14) after the experiment is completed, and to pull out the FRP tendon.

10. The method for operating the self-cleaning and reusable universal anchor sleeve for composite reinforcement according to any one of claims 1 to 9, characterized in that: Connect the first sleeve with the connecting sleeve, insert the FRP bar into the first sleeve and the connecting sleeve, align and connect them with the centering pad, and then install the centering cap on the end of the connecting sleeve to achieve sealing; inject colloid into the first sleeve through the injection hole, and start the pull-out test after curing for several days; After the experiment is completed, the end anchor is installed on the end of the first sleeve by bolts, and the memory metal layer is pulled by a pulling device to pull the memory metal thread of the memory metal layer into a flat state, so that the colloid and the memory metal layer in the first sleeve and the connecting sleeve are separated, and the residual colloid in the first sleeve and the connecting sleeve is cleaned. The first sleeve and the connecting sleeve are heated by a heating element to restore the memory metal layer to its original state so that it can be used again.

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