Prestressed anchorage device

Abstract

The utility model discloses a prestressed anchorage device which comprises an anchor backing plate and a plurality of steel strands, a working anchor plate is installed on one side of the anchor backing plate, a sleeve is installed on the other side of the anchor backing plate, a corrugated pipe is arranged on one side of the sleeve, spiral bars are arranged on the outer wall of the corrugated pipe and the outer wall of the sleeve in a sleeved mode, the sleeve is conical, and the anchor backing plate is fixedly connected with the large end of the sleeve. The corrugated pipe is connected with the small end of the sleeve through a connecting assembly; a plurality of conical through holes are formed in the working anchor plate, working clamping pieces are arranged in the conical through holes, a limiting assembly is arranged on one side of each working clamping piece and comprises a mounting ring and a baffle, a plurality of groove holes are formed in the mounting ring, clamping grooves are formed in the upper end and the lower end of the inner ring face of the mounting ring, and a sliding block is arranged on the outer wall of the baffle. And springs are arranged in the two clamping grooves. The working clamping piece is prevented from moving out of the working anchor plate along with the steel strand, so that the working clamping piece is prevented from falling off, and the anti-falling effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor equipment, in particular to a prestressed anchor. Background Art

[0002] Anchors are permanent anchoring devices used in prestressed concrete. They are used in post-tensioned structures or components to maintain the tension of prestressed tendons and transfer it to the concrete. They are also called prestressed anchors. Prestressed anchors are widely used in various engineering projects, including highway bridges, railway bridges, urban interchanges, urban light rail, and high-rise buildings. China's anchor production bases are primarily in cities such as Liuzhou, Hangzhou, Tianjin, Chengdu, and Kaifeng. Prestressed production companies in these cities have made significant contributions to the vigorous construction of prestressed structural projects in my country, primarily new high-speed railways, expressways, and intercity railways.

[0003] Steel strands are mainly anchored by clip-type anchors, which are currently the most commonly used and most reliable prestressed anchors. According to the national standard GB / T14370-2015 "Anchors, clamps and connectors for prestressed tendons", the clip-type anchors used for steel strands in my country, unless otherwise specified, are all 1860MPa grade, which is the highest strength grade implemented internationally. Figure 10 As shown, the clip-type anchor mainly includes a working clip, an anchor plate, and an anchor pad. The working clip engages the steel strand through its internal engaging surface. When the steel strand retracts under the action of an external force, the working clip is displaced within the tapered through-hole of the anchor plate. The radial clamping force of the anchor plate on the working clip increases accordingly, ultimately achieving the purpose of anchoring the steel strand. However, the above-mentioned prestressed anchor has the following shortcomings: when the steel strand is tensioned, due to the action of friction, the working clip may move out of the anchor plate along with the steel strand, causing it to fall off, affecting the tensioning process. It is not stable and reliable, and further improvements can be made. Summary of the Invention

[0004] In order to solve the problems pointed out in the background technology, the utility model proposes a prestressed anchor. Under the action of the spring in the limit assembly, the baffle always pushes the working clip to prevent the working clip from moving out of the working anchor plate following the steel strand, thereby preventing the working clip from falling off and playing a role in preventing it from falling off.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] The utility model discloses a prestressed anchor, comprising an anchor plate and a plurality of steel strands, wherein a working anchor plate is installed on one side of the anchor plate, a sleeve is installed on the side of the anchor plate away from the working anchor plate, a corrugated tube is provided on the side of the sleeve away from the anchor plate, spiral ribs are provided on the outer walls of the corrugated tube and the sleeve, the anchor plate and the sleeve are hollow, the sleeve is tapered, the anchor plate is fixedly connected to the large end of the sleeve, and the corrugated tube is connected to the small end of the sleeve via a connecting assembly;

[0007] The working anchor plate is provided with a plurality of conical through holes connected with the anchor plate, and a working clip is provided inside the conical through holes, and a limit assembly is provided on the side of the working clip away from the working anchor plate, and the limit assembly includes a mounting ring and a baffle, and a plurality of slots are provided inside the mounting ring, and the inner ring surface diameter of the mounting ring is not larger than the outer diameter of the working anchor plate, and the inner ring surface of the mounting ring is provided with a card slot at both upper and lower ends, and the outer wall of the baffle is provided with a slider, and the slider is slidably connected with the card slot, and a spring is provided in each of the two card slots, and the spring is located on the side of the baffle away from the working anchor plate, one end of the spring is in contact with the slider, and the other end of the spring is fixedly connected to the inner wall of the card slot;

[0008] A threaded rod is installed at one end of the anchor plate, and one end of the threaded rod passes through the mounting ring and is threadedly sleeved with a nut.

[0009] Preferably, the corrugated pipe is a hollow cylindrical structure, and one end of the steel strand passes through the working anchor plate, the anchor pad and the sleeve in sequence and is located inside the corrugated pipe.

[0010] Preferably, the conical outer surface of the sleeve is provided with a plurality of annular protrusions, and the cross-section of the annular protrusions is triangular.

[0011] Preferably, the connecting assembly includes flange 1 and flange 2, flange 1 is arranged on the side of the sleeve away from the anchor plate, and flange 2 is arranged at one end of the corrugated pipe. Both flange 1 and flange 2 are provided with connecting holes, and bolts are arranged inside the connecting holes. There are multiple bolts and connecting holes and they are distributed in a circular shape.

[0012] Preferably, one end of the sleeve is provided with an inner conical surface, and one end of the bellows is provided with an outer conical surface, the outer conical surface is inserted into the inner conical surface, and the inner and outer conical surfaces have the same inclination.

[0013] Preferably, an annular groove is formed on the flange 1 and the flange 2, and a sealing ring is provided inside the annular groove.

[0014] Preferably, the three corners of the anchor plate are provided with mounting holes, the other corner of the anchor plate is provided with a grouting hole, the grouting hole is provided with a grouting pipe at the opening close to one side of the casing, and the lumen of the grouting pipe is connected with the lumen of the casing.

[0015] Preferably, the inner wall of the working clamp is provided with an internal thread, and the outer wall of the working clamp is in a conical shape matching the conical through hole.

[0016] Preferably, two threaded rods are provided, and the two threaded rods are symmetrically distributed up and down about the center line of one end of the anchor plate, and the threaded rod and the anchor plate are an integrated structure.

[0017] The beneficial effects of the utility model are:

[0018] The present invention can be used to fix the steel strands in the work anchor plate by installing the working clip into the inside of the tapered through hole, and making the steel strands pass through the middle position of the two working clips, and then making the working clips clamp the steel strands, and then the corresponding mounting ring is installed on one side of the anchor plate. After the limiting assembly is installed in place, one end of the baffle contacts the working clip, so that the working clip can be limited in the inside of the tapered through hole, and the working clip will not fall off during the installation of the prestressed anchor. And by arranging a spring in the limiting assembly, in the process of pulling the steel strands outward, the baffle always pushes the working clip under the action of the spring, so as to prevent the working clips from following the steel strands to move out of the working anchor plate, thereby preventing the working clips from falling off, and playing the role of preventing them from falling off. The structure is simple and practical, the cost is low, and it is suitable for large-scale promotion and application.

[0019] Secondly, the utility model arranges a sleeve and flange one on the anchor plate, and arranges flange two on the bellows, so that the staff can first connect flange one and flange two, and then fix and install them with bolts. This design structure is simple and easy to install; and by arranging an inner conical surface at one end of the sleeve and an outer conical surface at one end of the bellows, the staff can insert the outer conical surface into the interior of the inner conical surface. Furthermore, an annular groove and a sealing ring are also arranged between flange one and flange two, which can further enhance the sealing between the anchor plate and the bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional prestressed anchor of the utility model. Figure 1 .

[0021] Figure 2 This is a three-dimensional prestressed anchor of the utility model. Figure 2 .

[0022] Figure 3 It is a cross-sectional view of a prestressed anchor of the utility model.

[0023] Figure 4 This utility model is a prestressed anchor Figure 3 Enlarged schematic diagram of point A in the middle.

[0024] Figure 5 It is a schematic diagram of a working anchor plate and a limiting component in a prestressed anchor of the utility model.

[0025] Figure 6 The utility model is a schematic diagram of a sleeve and a flange in a prestressed anchor.

[0026] Figure 7 It is a schematic diagram of a bellows and flange 2 in a prestressed anchor of the utility model.

[0027] Figure 8 It is a cross-sectional view of a sleeve in a prestressed anchor of the utility model.

[0028] Figure 9 It is a cross-sectional view of a corrugated pipe in a prestressed anchor of the utility model.

[0029] Figure 10 It is a schematic diagram of a clip-type anchor in the prior art. DETAILED DESCRIPTION

[0030] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0031] like Figures 1 to 9 As shown, a prestressed anchor comprises an anchor plate 1 and a plurality of steel strands 2, a working anchor plate 3 is installed on one side of the anchor plate 1, a sleeve 4 is installed on the side of the anchor plate 1 away from the working anchor plate 3, a corrugated tube 5 is provided on the side of the sleeve 4 away from the anchor plate 1, the outer walls of the corrugated tube 5 and the sleeve 4 are provided with spiral ribs 6, the anchor plate 1 and the sleeve 4 are hollow, the sleeve 4 is conical, the anchor plate 1 is fixedly connected to the large end of the sleeve 4, and the corrugated tube 5 is connected to the small end of the sleeve 4 through a connecting assembly; a plurality of conical through holes 7 connected to the anchor plate 1 are opened inside the working anchor plate 3, a working clip 8 is provided inside the conical through hole 7, and a limiting assembly is provided on the side of the working clip 8 away from the working anchor plate 3.

[0032] Specifically, the limiter assembly includes a mounting ring 9 and a baffle 10. The mounting ring 9 has multiple slots 11 formed inside. The inner diameter of the mounting ring 9 is no larger than the outer diameter of the working anchor plate 3. Slots 12 are formed at both the upper and lower ends of the inner surface of the mounting ring 9. The outer wall of the baffle 10 is provided with sliders 13, which are slidably connected to the corresponding slots 12. A spring 14 is provided in each of the two slots 12. The spring 14 is located on the side of the baffle 10 away from the working anchor plate 3. One end of the spring 14 contacts the slider 13, and the other end is fixedly connected to the inner wall of the slot 12. A threaded rod 15 is mounted on one end of the anchor plate 1. One end of the threaded rod 15 passes through the mounting ring 9 and is threadedly fitted with a nut 16. The limiter assembly can be removed by removing the nut 16, making installation and disassembly convenient and easy.

[0033] Please refer again Figure 3-Figure 5 A threaded rod 15 is installed at one end of the anchor plate 1, and then a mounting ring 9 is installed on one side of the working anchor plate 3. One end of the threaded rod 15 passes through the mounting ring 9 and is fixed by a nut 16. After the mounting ring 9 is installed in place, one end of the baffle 10 in the limit assembly contacts one end of the clip.

[0034] In this embodiment, the bellows 5 is a hollow cylindrical structure, and one end of the steel strand 2 passes through the working anchor plate 3, the anchor pad 1 and the sleeve 4 in sequence and is located inside the bellows 5. The installed bellows 5 can effectively protect the steel strand 2.

[0035] In this embodiment, the conical outer surface of the sleeve 4 is provided with a plurality of annular protrusions 17, each of which has a triangular cross section. The annular protrusions 17 can increase the bite force between the sleeve 4 and the concrete, preventing the anchor plate 1 from slipping when under pressure.

[0036] The connection assembly includes flange 18 and flange 2 19. Flange 18 is located on the side of the casing 4 away from the anchor plate 1, and flange 2 19 is located at one end of the bellows 5. Both flange 18 and flange 2 19 have connection holes 20 formed therein. Bolts 21 are disposed within the connection holes 20. Multiple bolts 21 and connection holes 20 are provided and distributed in a circular pattern. The bolts 21 securely mount the bellows 5 to the casing 4.

[0037] Please refer again Figure 6-Figure 9One end of the sleeve 4 is provided with an inner conical surface 22, and one end of the bellows 5 is provided with an outer conical surface 23. The outer conical surface 23 is inserted into the inner conical surface 22, and the inner and outer conical surfaces 22 and 23 have the same inclination. The matching outer and inner conical surfaces 23 and 22 facilitate the insertion of the bellows 5 into the sleeve 4. Furthermore, an annular groove 24 is formed on both flange 18 and flange 2 19, and a sealing ring 25 is disposed inside the annular groove 24.

[0038] In this embodiment, the three corners of the anchor plate 1 are provided with mounting holes 26, and the other corner of the anchor plate 1 is provided with a grouting hole 27. The grouting hole 27 is provided with a grouting pipe 28 at the opening of the hole near the side of the casing 4. The lumen of the grouting pipe 28 is connected to the lumen of the casing 4. Cement slurry is injected through the grouting hole 27 and the grouting pipe 28.

[0039] It is worth mentioning that the inner wall of the working clamp 8 is provided with an internal thread, and the outer wall of the working clamp 8 is tapered to match the tapered through hole 7. On the one hand, the internal thread on the working clamp 8 and the steel strand 2 increase the friction between them, which helps to secure the clamp. On the other hand, the tapered shape of the working clamp 8 facilitates the insertion of the working clamp 8 into the tapered through hole 7.

[0040] As an implementable embodiment, two threaded rods 15 are provided, and the two threaded rods 15 are symmetrically distributed up and down about the center line of one end of the anchor plate 1, and the threaded rod 15 and the anchor plate 1 are an integral structure.

[0041] The applicant would like to explain that when the existing prestressed anchor is in use, during the assembly process of the prestressed anchor, the bellows 5 and the anchor plate 1 are in a locked state and there is no connecting structure between the two, which makes it easy for the two to separate during operation.

[0042] The utility model arranges a sleeve 4 and a flange 18 on the anchor plate 1, and arranges a flange 2 19 on the bellows 5, so that the staff can first connect the flange 18 and the flange 2 19, and then use bolts 21 to fix and install them. This design structure is simple and easy to install; and an inner conical surface 22 is arranged at one end of the sleeve 4, and an outer conical surface 23 is arranged at one end of the bellows 5, so that the staff can insert the outer conical surface 23 into the interior of the inner conical surface 22. Furthermore, an annular groove 24 and a sealing ring 25 are also arranged between the flange 18 and the flange 2 19, which can further enhance the sealing between the anchor plate 1 and the bellows 5.

[0043] How to use this product:

[0044] When in use, first install the bellows 5 on one side of the sleeve 4. The staff can first connect the flange 18 on the bellows 5 with the flange 2 19 on the sleeve 4, and then screw the bolt 21 into the inside of the connecting hole 20. At this time, the fixed installation of the sleeve 4 and the bellows can be completed, and an inner conical surface 22 and an outer conical surface 23 are set at the connection between the flange 18 and the flange 2 19, so that the staff can insert the outer conical surface 23 into the inside of the inner conical surface 22, and an annular groove 24 and a sealing ring 25 are also set between the sleeve 4 and the bellows 5, which can further enhance the sealing between the sleeve 4 and the bellows 5; then install the spiral rib 6 on the outside of the sleeve 4 and the bellows 5, and pass the steel strand 2 through the bellows 5, the sleeve 4 and the anchor plate 1 in turn, and the installed bellows 5 can effectively protect the steel strand 2.

[0045] When the staff passes the steel strand 2 through the working anchor plate 3, they install the working clip 8 into the inside of the tapered through hole 7 and make the steel strand 2 pass through the middle position of the two working clips 8, then make the working clip 8 clamp the steel strand 2, and then install the corresponding mounting ring 9 on one side of the anchor plate 1, make the threaded rod 15 installed at one end of the anchor plate 1 pass through the mounting ring 9, and then fix it with a nut 16. In this way, after the limit assembly is installed in place, one end of the baffle 10 can contact the working clip 8, so that the working clip 8 can be limited to the inside of the tapered through hole 7, and the staff will not fall off during the installation of the prestressed anchor; and by arranging a spring 14 in the limit assembly, in the process of pulling the steel strand 2 outward, the baffle 10 always pushes the working clip 8 under the action of the spring 14, preventing the working clip 8 from following the steel strand 2 to move out of the working anchor plate 3, thereby preventing the working clip 8 from falling off, playing an anti-falling effect. The structure is simple and practical, the cost is low, and it is suitable for large-scale promotion and application.

[0046] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A prestressed anchor, comprising an anchor plate (1) and a plurality of steel strands (2), wherein a working anchor plate (3) is installed on one side of the anchor plate (1), characterized in that: A sleeve (4) is installed on the side of the anchor plate (1) away from the working anchor plate (3), a bellows (5) is provided on the side of the sleeve (4) away from the anchor plate (1), spiral ribs (6) are provided on the outer walls of the bellows (5) and the sleeve (4), the anchor plate (1) and the sleeve (4) are hollow, the sleeve (4) is conical, the anchor plate (1) is fixedly connected to the large end of the sleeve (4), and the bellows (5) is connected to the small end of the sleeve (4) via a connecting assembly; The working anchor plate (3) is provided with a plurality of tapered through holes (7) in communication with the anchor pad (1), the tapered through holes (7) are provided with working clips (8), a limiting assembly is provided on the side of the working clip (8) away from the working anchor plate (3), the limiting assembly comprises a mounting ring (9) and a baffle (10), a plurality of slots (11) are provided inside the mounting ring (9), the inner ring surface diameter of the mounting ring (9) is not larger than the outer diameter of the working anchor plate (3), the inner ring surface of the mounting ring (9) is provided with slots (12) at both upper and lower ends, and a slider (13) is provided on the outer wall of the baffle (10). The slider (13) is slidably connected to the slot (12), and a spring (14) is provided in each of the two slots (12). The spring (14) is located on a side of the baffle (10) away from the working anchor plate (3). One end of the spring (14) is in contact with the slider (13), and the other end of the spring (14) is fixedly connected to the inner wall of the slot (12). A threaded rod (15) is installed at one end of the anchor plate (1), and one end of the threaded rod (15) passes through the mounting ring (9) and is threadedly sleeved with a nut (16).

2. The prestressed anchor according to claim 1, characterized in that: The bellows (5) is a hollow cylindrical structure, and one end of the steel strand (2) passes through the working anchor plate (3), the anchor pad (1), and the sleeve (4) in sequence and is located inside the bellows (5).

3. The prestressed anchor according to claim 1, characterized in that: The conical outer surface of the sleeve (4) is provided with a plurality of annular protrusions (17), and the cross-section of the annular protrusions (17) is triangular.

4. The prestressed anchor according to claim 1, characterized in that: The connecting assembly comprises flange 1 (18) and flange 2 (19), wherein flange 1 (18) is arranged on a side of the sleeve (4) away from the anchor plate (1), and flange 2 (19) is arranged at one end of the bellows (5), and connecting holes (20) are both provided on flange 1 (18) and flange 2 (19), and bolts (21) are provided inside the connecting holes (20), and a plurality of bolts (21) and connecting holes (20) are provided and distributed in a circular shape.

5. The prestressed anchor according to claim 1, characterized in that: One end of the sleeve (4) is provided with an inner conical surface (22), and one end of the bellows (5) is provided with an outer conical surface (23). The outer conical surface (23) is inserted into the interior of the inner conical surface (22), and the inner conical surface (22) and the outer conical surface (23) have the same inclination.

6. The prestressed anchor according to claim 4, characterized in that: An annular groove (24) is provided on the flange 1 (18) and the flange 2 (19), and a sealing ring (25) is provided inside the annular groove (24).

7. The prestressed anchor according to claim 1, characterized in that: The anchor plate (1) has mounting holes (26) at three corners, and a grouting hole (27) is provided at another corner of the anchor plate (1). A grouting pipe (28) is provided at the opening of the grouting hole (27) near one side of the casing (4), and the lumen of the grouting pipe (28) is communicated with the lumen of the casing (4).

8. The prestressed anchor according to claim 1, characterized in that: An inner wall of the working clamp (8) is provided with an internal thread, and an outer wall of the working clamp (8) is in a conical shape that matches the conical through hole (7).

9. The prestressed anchor according to claim 1, characterized in that: Two threaded rods (15) are provided, and the two threaded rods (15) are symmetrically distributed up and down about the center line of one end of the anchor plate (1), and the threaded rod (15) and the anchor plate (1) are an integrated structure.

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