Secondary anchoring type anchorage device for FRP rib

Abstract

The utility model discloses a secondary anchoring type anchorage device for an FRP (fiber reinforced plastic) rib, which comprises an anchorage device sleeve and an end anchor plate, a clamping piece through hole for mounting the FRP rib is arranged in the anchorage device sleeve, and a plurality of clamping pieces are arranged between the anchorage device sleeve and the FRP rib; radial bolts matched with the clamping pieces are arranged on the anchorage device sleeve; an end anchor plate is fixed to the end of the anchorage device sleeve, the end anchor plate is provided with axial bolts matched with the multiple clamping pieces, and the end anchor plate is further provided with axial holes matched with the FRP ribs. The anchor device comprises an anchor device sleeve, an end anchor plate, a plurality of clamping pieces, a plurality of radial bolts and a plurality of axial bolts. The radial threaded holes apply radial jacking force to the clamping pieces, so that the clamping effect of the clamping pieces on the FRP rib is improved; the axial bolt exerts axial jacking force on the clamping piece, and the clamping effect of the clamping piece on the FRP rib is improved; and through the combined action of the radial bolts and the axial bolts, a better anchoring effect on the prestressed FRP ribs is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchors, in particular to a secondary anchoring type anchor for FRP bars. Background Art

[0002] Fiber-reinforced composites (FRPs) are composite materials formed by processing reinforced fiber materials through various molding processes. Compared to traditional steel bars, FRP composites offer higher specific density, greater specific modulus, improved designability, and enhanced corrosion resistance. Furthermore, because their coefficient of thermal expansion is similar to that of concrete, FRP concrete structures offer higher temperature performance than reinforced concrete structures, enabling more stable application in large buildings under harsh conditions.

[0003] Existing FRP bar clamping anchors are primarily primary anchors, relying on clips or tapered plugs to generate annular pressure on the FRP bar, thereby clamping it and securing the prestressed FRP bar. However, tests have shown that when significant tensile forces act on the prestressed FRP bar, the bar tends to slip outward, causing the anchor to lose its anchoring function. Therefore, it is necessary to develop a secondary anchor for FRP bars with improved anchoring performance. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a secondary anchoring anchor for FRP bars with better anchoring effect.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the utility model is as follows: it includes an anchor sleeve and an end anchor plate, the anchor sleeve is provided with a clip through hole for installing FRP reinforcement, a plurality of clips are provided between the anchor sleeve and the FRP reinforcement, the plurality of clips form a straight bevel gear shape, and a clip gap is left between adjacent clips; radial threaded holes are provided on the anchor sleeve to cooperate with the plurality of clips, and a radial bolt is threadedly connected to each radial threaded hole; the end of the anchor sleeve is fixed with an end anchor plate, and the end anchor plate is fixed to the anchor sleeve by a plurality of connecting bolts, the end anchor plate is provided with an axial threaded hole to cooperate with the plurality of clips, an axial bolt is provided in the axial threaded hole, the bottom of the axial bolt is in contact with the large end of the clip, and the end anchor plate is also provided with an axial hole to cooperate with the FRP reinforcement.

[0006] Furthermore, the clip includes a clip body, an arc-shaped portion cooperating with the FRP reinforcement is provided on the inner side of the clip body, two clip limiting strips are provided on the outer side of the clip body, a clip limiting groove corresponding to the clip limiting strip is provided in the anchor sleeve, and the clip limiting strips on two adjacent clip bodies are installed in the same clip limiting groove.

[0007] Furthermore, the end anchor plate is fixed to the anchor sleeve by a plurality of connecting bolts. The end anchor plate is provided with connecting holes for installing the connecting bolts, and the anchor sleeve is provided with mounting threaded holes that cooperate with the connecting bolts.

[0008] Furthermore, the exterior of the anchor sleeve is in the shape of a straight polygonal column.

[0009] Furthermore, the large ends of the plurality of clips are close to the end anchor plate, and the small ends of the clips are far away from the end anchor plate.

[0010] Furthermore, the anchor sleeve, the end anchor plate and the clip are all made of carbon fiber reinforced composite material.

[0011] Furthermore, the radial bolts and the axial bolts are made of corrosion-resistant aluminum alloy.

[0012] The beneficial effects of the utility model are:

[0013] The utility model comprises an anchor sleeve, end anchor plates, a plurality of clips, a plurality of radial bolts, and a plurality of axial bolts. The radial threaded holes exert radial thrust on the clips, thereby increasing their grip on the FRP bars. The axial bolts exert axial thrust on the clips, thereby increasing their grip on the FRP bars. The combined action of the radial and axial bolts provides a better anchoring effect on the prestressed FRP bars.

[0014] Compared with the existing prestressed FRP tendon anchoring device, the utility model is provided with a plurality of axial bolts at the end of the axis. The friction between the clip and the FRP tendon is increased by squeezing the clip by the plurality of axial bolts, which prevents the FRP tendon from slipping under the action of large tensile force to a certain extent, thereby improving the anchoring effect of the anchor.

[0015] The utility model provides a plurality of clips between the FRP reinforcement and the anchor sleeve, and the plurality of clips are combined to form a structure similar to a spur bevel gear. After the end anchor plate on the anchor sleeve is removed, the plurality of clips can be installed in the clip through-holes through the large ends of the end anchor plates; a clip gap is left between adjacent clips, so that the clips can be pushed by radial bolts to extrude and fix the FRP reinforcement in the radial direction; clip limiting strips are provided on the plurality of clips, and the clip limiting strips of adjacent clips are located in the same clip limiting groove on the anchor sleeve, so that the plurality of clips can move axially, so that the clips can be pushed by axial bolts to extrude and fix the FRP reinforcement in the axial direction.

[0016] The utility model passes the FRP bar through the arc-shaped portion of several clips, uses a jack to apply a preliminary pre-tightening force to the clips, and uses the clamping force of the clips to anchor the anchor sleeve and FRP bar. After the anchoring reaches stability, the end anchor plate is fixed, and the axial bolts are rotated at the same time. Each axial bolt presses against a clip, increasing the extrusion force between the clip, the anchor sleeve, and the FRP bar as a whole. At this time, the friction between the clip and the anchor sleeve, and between the anchor sleeve and the FRP bar increases, achieving the first anchoring. After the first anchoring is stable, the radial bolts are rotated. Each radial bolt presses against a clip, further increasing the friction between the FRP bar and the anchor sleeve, and thus obtaining a secondary anchoring type anchor for the FRP bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the overall structure of another direction of the utility model;

[0019] Figure 3 It is a rear view of the utility model;

[0020] Figure 4 It is a front view of the utility model;

[0021] Figure 5 for Figure 4 AA section view in;

[0022] Figure 6 Schematic diagram of the overall structure of the clip;

[0023] Figure 7 is a schematic diagram of the structure of the clip;

[0024] Figure 8 Schematic diagram of the structure of the anchor sleeve Figure 1 ;

[0025] Figure 9 Schematic diagram of the structure of the anchor sleeve Figure 2 ;

[0026] Figure 10 It is a front view of the anchor sleeve;

[0027] Figure 11 for Figure 10 BB cross-sectional view in;

[0028] The symbols of the components are as follows:

[0029] 1. Anchor sleeve; 11. Clip through hole; 111. Clip limiting groove; 12. Radial threaded hole; 13. Radial bolt;

[0030] 2. End anchor plate; 21. Connection hole; 22. Connection bolt; 23. Axial threaded hole; 24. Axial bolt; 25. Axial hole;

[0031] 3. Clip; 31. Clip body; 32. Clip limit strip; 33. Arc-shaped portion; 4. FRP reinforcement; 5. Clip gap. DETAILED DESCRIPTION

[0032] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.

[0033] like Figure 1 、 2 As shown in , 3, 4 and 5, the secondary anchorage type anchor for FRP bars is used in conjunction with the FRP bars 4. The secondary anchorage type anchor for FRP bars includes an anchor sleeve 1 and an end anchor plate 2. The outer portion of the anchor sleeve 1 is in the shape of a straight polygonal column, as shown in FIG. Figure 1 The anchor sleeve 1 is in the shape of a hexagonal prism. A clip through hole 11 for installing the FRP bar 4 is provided in the anchor sleeve 1. A number of clips 3 are provided between the anchor sleeve 1 and the FRP bar 4. The clips 3 form a straight bevel gear shape. The large ends of the clips 3 are close to the end anchor plate 2, and the small ends of the clips 3 are away from the end anchor plate 2. A clip gap is left between adjacent clips 3; preferably, there are six clips 3, and the six clips 3 are combined to form a straight bevel gear shape with six teeth. The anchor sleeve 1 is provided with radial threaded holes 12 that cooperate with the six clips 3. A radial bolt 13 is threadedly connected to each radial threaded hole 12. The radial bolt 13 is preferably made of corrosion-resistant aluminum alloy. The clip gap 5 between adjacent clips 3 allows the clip 3 to perform secondary extrusion and fixation on the FRP4 bar in the radial direction under the push of the radial bolt 13. The anchor sleeve 1, the end anchor plate 2 and the clip 3 are preferably made of carbon fiber reinforced composite material.

[0034] like Figure 6 and 7 As shown, the clip 3 includes a clip body 31, an arc-shaped portion 33 cooperating with the FRP reinforcement 4 is provided on the inner side of the clip body 31, two clip limiting strips 32 are provided on the outer side of the clip body 31, and a clip limiting groove 111 corresponding to the clip limiting strip 32 is provided in the anchor sleeve 1, and the clip limiting strips 32 on two adjacent clip bodies 31 are installed in the same clip limiting groove 111.

[0035] like Figure 8 、 9As shown in Figures 10 and 11, an end anchor plate 2 is fixed to the end of the anchor sleeve 1. The end anchor plate 2 is provided with axial threaded holes 23 that cooperate with the six clips 3. Axial bolts 24 are provided in the axial threaded holes 23. The axial bolts 24 are preferably made of corrosion-resistant aluminum alloy. The bottom of the axial bolts 24 contacts and cooperates with the large end of the clip 3. The end anchor plate 2 is also provided with an axial hole 25 that cooperates with the FRP bar 4. The end anchor plate 2 is fixed to the anchor sleeve 1 by six connecting bolts 22. The end anchor plate 2 is provided with connecting holes 21 for installing the connecting bolts 22. The anchor sleeve 1 is provided with mounting threaded holes that cooperate with the connecting bolts 22. Several clips 3 are provided with clip limiting strips 32, and the clip limiting strips 32 of adjacent clips 2 are located in the same clip limiting groove 111 on the anchor sleeve 1, so that several clips 3 can move axially, so that the clips 3 can be pushed by the axial bolts 24 and combined with the pushing action of the jack on the clips to perform a single extrusion and fixation of the FRP reinforcement 4 in the axial direction.

[0036] The preparation and installation method of the utility model is as follows:

[0037] S1. Create a three-dimensional solid model of the anchor sleeve 1, the end anchor plate 2, and the clip 3, import it into a slicing software for slicing, and print the sliced ​​data using a 3D printer to obtain the anchor sleeve 1, the end anchor plate 2, and the clip 3;

[0038] S2. First, install several clips 3 into the anchor sleeve 1 through the clip through holes 11, then install the end anchor plate 2 on the end of the anchor sleeve 1 with six connecting bolts 22, and then evenly install six axial bolts 24 on the end anchor plate 2;

[0039] S3, pass the FRP bar 4 through the arc-shaped portion 33 of the plurality of clips 3, apply a preliminary pre-tightening force to the anchor sleeve 1 through a jack, and anchor the anchor sleeve 1 and the FRP bar 4 using the clamping force of the clips 3;

[0040] S4. After the anchoring reaches stability, the axial bolts 24 are rotated simultaneously. Each axial bolt 24 has a clip 3, which increases the extrusion force between the clip 3, the anchor sleeve 1, and the FRP bar 4. At this time, the friction between the clip 3 and the anchor sleeve 1, and between the anchor sleeve 1 and the FRP bar 4 increases, and the first anchoring is achieved overall.

[0041] S5. After the primary anchoring is stable, rotate the radial bolts 13. Each radial bolt 13 squeezes a clip 3, further increasing the squeezing force between the clip 3, the anchor sleeve 1 and the FRP bar 4 as a whole, completing the installation of the FRP bar secondary anchorage.

[0042] Each component of the anchor of the utility model can be prepared by 3D printing, which can realize the integrated molding of complex structures. The printing material uses carbon fiber composite material, which has the advantages of light weight, high strength, corrosion resistance, and aging resistance. The stiffness is similar to that of FRP bars, which can prevent the FRP bars from being pinched off.

Claims

1. A secondary anchorage type anchor for FRP bars, used in conjunction with FRP bars (4), characterized in that: The invention comprises an anchor sleeve (1) and an end anchor plate (2); a clip through hole (11) for installing an FRP rib (4) is provided in the anchor sleeve (1); a plurality of clips (3) are provided between the anchor sleeve (1) and the FRP rib (4); the plurality of clips (3) form a straight bevel gear shape, and a clip gap (5) is left between adjacent clips (3); The anchor sleeve (1) is provided with radial threaded holes (12) that cooperate with a plurality of clips (3), and each radial threaded hole (12) is internally threadedly connected to a radial bolt (13); An end anchor plate (2) is fixed to the end of the anchor sleeve (1), and the end anchor plate (2) is provided with an axial threaded hole (23) that cooperates with a plurality of clips (3). An axial bolt (24) is provided in the axial threaded hole (23), and the bottom of the axial bolt (24) contacts and cooperates with the large end of the clip (3). The end anchor plate (2) is also provided with an axial hole (25) that cooperates with the FRP rib (4).

2. The secondary anchorage type anchor for FRP bars according to claim 1, characterized in that: The clip (3) includes a clip body (31), an arc-shaped portion (33) cooperating with the FRP rib (4) is provided on the inner side of the clip body (31), two clip limiting strips (32) are provided on the outer side of the clip body (31), a clip limiting groove (111) corresponding to the clip limiting strip (32) is provided in the anchor sleeve (1), and the clip limiting strips (32) on two adjacent clip bodies (31) are installed in the same clip limiting groove (111).

3. The secondary anchorage type anchor for FRP bars according to claim 1, characterized in that: The end anchor plate (2) is fixed to the anchor sleeve (1) via a plurality of connecting bolts (22); the end anchor plate (2) is provided with connecting holes (21) for installing the connecting bolts (22); and the anchor sleeve (1) is provided with mounting threaded holes that cooperate with the connecting bolts (22).

4. The secondary anchorage type anchor for FRP bars according to claim 1, characterized in that: The exterior of the anchor sleeve (1) is in the shape of a straight polygonal column.

5. The secondary anchorage type anchor for FRP bars according to claim 1, characterized in that: The large ends of the plurality of clips (3) are close to the end anchor plate (2), and the small ends of the clips (3) are far away from the end anchor plate (2).

6. The secondary anchorage type anchor for FRP bars according to claim 1, characterized in that: The anchor sleeve (1), the end anchor plate (2) and the clip (3) are all made of carbon fiber reinforced composite material.

7. The secondary anchorage type anchor for FRP bars according to claim 1, characterized in that: The radial bolts (13) and the axial bolts (24) are both made of corrosion-resistant aluminum alloy.

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