A prestressed cable anchor device convenient to disassemble

Abstract

This utility model discloses a prestressed cable anchor that is easy to disassemble, belonging to the technical field of prestressed cable anchors. The prestressed cable anchor includes a fixed bushing and an anchor assembly, with an anchor cable connected to the anchor assembly. The fixed bushing is fixed to the rock mass through an anchor pile hole, and its inner wall has internal threads. The anchor assembly includes an inner anchor and an outer anchor, which are rotatably connected by a thrust bearing. The outer wall of the outer anchor has external threads and is screwed onto the inner wall of the fixed bushing through these threads. The inner anchor has multiple tapered holes, and tapered elastic clips are fitted inside these holes. The anchor cable passes through the inner wall of the elastic clips and is connected to the inner anchor through the elastic clips. Because the anchor assembly is threadedly connected to the fixed bushing, it is easier to remove the anchor assembly from the fixed bushing, avoiding the situation where the clamping device is damaged under high stress, making the anchor impossible to remove. It also makes it easier to adjust the stress of the anchor cable.

Description

Technical Field

[0001] This utility model belongs to the field of prestressed anchor cable anchorage technology, specifically a prestressed anchor cable anchorage that is easy to disassemble. Background Technology

[0002] Prestressed anchor cables are devices that apply additional stress to rock masses to enhance their stability. Prestressed anchor cables are anchored inside the rock mass using a prestressing method to reinforce slopes. The anchor cables are anchored into the rock mass through anchorages, connecting the sliding body with the stable rock layer, thereby changing the stress state of the slope rock mass.

[0003] Current prestressed anchor cables are generally installed in a single, cement-filled installation, making them difficult to remove and impossible to reuse. To address this, Chinese utility model patent CN214993809U discloses a detachable and recyclable prestressed anchor cable. This includes a protective cover, an anchor plate fixedly installed on the inner bottom wall of the cover, four first steel strands fixedly installed on the top of the anchor plate, an anchor fixture placed on top of the cover, and limiting chambers fixedly installed on both sides of the cover. The anchor fixture has two perforations inside. This detachable and recyclable prestressed anchor cable allows for disassembly by pulling a pull plate relative to a horizontal plate, causing the limiting plate to disengage from its limiting groove. The user then moves the pull plate upwards to disengage the horizontal plate from the limiting chamber, releasing the horizontal plate. The compression spring, due to its own rebound force, moves the horizontal plate into the perforation, completing the disassembly of the anchor fixture. Further upward movement of the anchor fixture allows the user to twist the first and second steel strands to separate them, enabling the second steel strand to be disassembled and reused. This significantly reduces disassembly difficulty and saves on project costs.

[0004] The aforementioned prestressed anchor cables have largely solved the problem of anchor cable recycling and reuse. However, there are still some shortcomings in the use of these prestressed anchor cables. The main problem is that when the anchor cable is subjected to upward stress, it will transfer the stress through the anchor, causing the clamping mechanism between the anchor and the protective cover to also have a large stress, which can easily lead to damage to the clamping mechanism and make the anchor difficult to remove. Utility Model Content

[0005] This invention proposes a prestressed anchor cable anchor that is easy to disassemble, aiming to solve the problem that existing detachable and recyclable prestressed anchor cables are difficult to disassemble due to jamming damage under stress.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A prestressed cable anchorage that is easy to disassemble includes a fixed bushing and an anchorage assembly, wherein an anchor cable is connected to the anchorage assembly; The fixed bushing is fixed to the rock mass through the anchor pile hole. The inner wall of the fixed bushing is provided with internal threads. The anchor assembly includes an inner anchor and an outer anchor. The inner anchor and the outer anchor are rotatably connected by a thrust bearing. The outer wall of the outer anchor is provided with external threads and is screwed onto the inner wall of the fixed bushing through the external threads. The inner anchor is provided with multiple tapered holes. Tapered elastic clips are fitted inside the tapered holes. The anchor cable passes through the inner wall of the elastic clip and is connected to the inner anchor through the elastic clip.

[0007] Preferably, a first step is provided on the inner wall of the outer anchor, a second step is provided on the outer wall of the inner anchor, the upper end face of the outer ring of the thrust bearing contacts the first step, and the lower end face of the inner ring of the thrust bearing contacts the second step.

[0008] Preferably, the upper end face of the outer anchor is provided with multiple blind holes at equal intervals.

[0009] Preferably, the upper part of the fixing bushing is provided with a fixing end face, and the lower end of the outer wall of the fixing bushing is provided with a fixing head. The upper part of the fixing head is a frustum structure with a smaller upper part and a larger lower part, and the outer diameter of the fixing end face is larger than the outer diameter of the fixing head.

[0010] Preferably, a filling hole is provided on the fixed end face, and the distance from the axis of the filling hole to the axis of the fixed bushing is not less than the outer diameter of the fixed end.

[0011] Preferably, it also includes a protective cover, which is snapped onto the upper edge of the fixed bushing. The top of the protective cover is provided with an opening, and a movable cover is provided above the opening. The movable cover is hinged to the top of the protective cover. The outer diameter of the movable cover is larger than the inner diameter of the opening, and the inner diameter of the opening is not smaller than the outer diameter of the outer anchor.

[0012] Preferably, it also includes a protective cover, which is snapped into the opening. The protective cover has through holes in the same number as the conical holes of the inner anchor, and the anchor cable passes through the through holes.

[0013] Beneficial effects: Compared with the prior art, the present invention can achieve at least the following technical effects: 1. The anchor assembly and the fixed bushing of this utility model are connected by threads, which makes it easier to remove the anchor assembly from the fixed bushing and recycle the anchor cable and the anchor assembly. At the same time, the threaded connection can withstand greater axial stress. Compared with the anchor cable and anchor fixed by the clamping device in the prior art, it avoids the situation where the clamping device is damaged under great stress, making the anchor unable to be removed.

[0014] 2. Since the anchor cable and anchor assembly are connected by threads in this utility model, the stress or tightness of the anchor cable can also be adjusted by adjusting the depth of the anchor assembly screwed into the fixed bushing, which makes it more flexible to use. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is an exploded view of the anchor assembly of this utility model.

[0017] Figure 3 This is a schematic diagram of the fixed bushing structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the protective cover structure of this utility model.

[0019] Figure 5 This is a schematic diagram of the protective cover structure of this utility model.

[0020] Figure 6 This utility model Figure 1 Enlarged view of point A in the middle.

[0021] In the diagram: 1. Fixed bushing; 101. Fixed end face; 102. Grouting hole; 103. Fixed end; 2. External anchor; 201. Blind hole; 202. First step; 3. Thrust bearing; 4. Internal anchor; 401. Second step; 402. Conical hole; 5. Anchor cable; 6. Protective cover; 601. Through hole; 7. Protective cover; 701. Opening; 702. Movable cover; 8. Conical elastic clip; 9. Anchor pile hole. Detailed Implementation

[0022] The present invention will be further explained below with reference to specific implementation examples.

[0023] Please see Figure 1-6 This utility model proposes a prestressed anchor cable anchor that is easy to disassemble, including a fixed bushing 1 and an anchor assembly, wherein an anchor cable 5 is connected to the anchor assembly; The fixed bushing 1 is fixed to the rock mass through the anchor pile hole 9. The inner wall of the fixed bushing 1 is provided with internal threads. The anchor assembly includes an inner anchor 4 and an outer anchor 2. The inner anchor 4 and the outer anchor 2 are rotatably connected by a thrust bearing 3. The outer wall of the outer anchor 2 is provided with external threads and is screwed onto the inner wall of the fixed bushing 1 through the external threads. The inner anchor 4 is provided with a plurality of tapered holes 402. A tapered elastic clip 8 is fitted inside the tapered holes 402. The anchor cable 5 passes through the inner wall of the elastic clip 8 and is connected to the inner anchor 4 through the elastic clip 8.

[0024] like Figure 1 , Figure 2As shown, the fixed bushing 1 is fixed to the rock surface through the pre-drilled anchor pile hole 9. When installing the anchor cable and anchor, the anchor cable 5 is first passed through the elastic clamp 8. When the anchor cable 5 is subjected to an upward tension, the anchor cable 5 drives the conical elastic clamp 8 to move upward in the conical hole 402 of the inner anchor 4 through friction. The conical hole 402 squeezes the conical elastic clamp 8 to clamp the anchor cable 5, thereby achieving the fixation between the anchor cable 5 and the anchor assembly. Since a thrust bearing 3 is installed between the inner anchor 4 and the outer anchor 2 in this embodiment, the inner anchor 4 and the outer anchor 2 can rotate relative to each other. Therefore, while keeping the inner anchor 4 from rotating, the outer anchor 2 can be rotated by a tool to screw the anchor assembly into the inner wall of the fixed bushing 1, thereby achieving the fixation between the anchor cable 5, i.e. the anchor assembly, and the rock mass.

[0025] When it is necessary to locate the anchor cable 5 and the anchor assembly, simply rotate the outer anchor 2 with a tool to unscrew it from the inner wall of the fixed bushing 1.

[0026] In addition, the position of the anchor assembly within the fixed bushing 1 can be adjusted by rotating the outer anchor, thereby adjusting the tension or tightness of the anchor cable 5.

[0027] In this embodiment, the inner wall of the outer anchor 2 is provided with a first step 202, the outer wall of the inner anchor 4 is provided with a second step 401, the upper end face of the outer ring of the thrust bearing 3 contacts the first step 202, and the lower end face of the inner ring of the thrust bearing 3 contacts the second step 401.

[0028] like Figure 6 As shown, in this embodiment, the inner ring and outer ring of the thrust bearing 3 are connected to the outer wall of the inner anchor 4 and the inner wall of the outer anchor 2 respectively by interference fit. The frictional force of the interference fit keeps the relative axial position of the inner anchor 4 and the outer anchor 2 fixed. In addition, by setting the first step 202 and the second step 401, the thrust bearing is fixed to the first step 202 and the second step 401, which plays a role in limiting the thrust bearing 3 and further improves the stability of the axial position of the inner anchor 4 and the outer anchor 2.

[0029] In this embodiment, the upper end face of the outer anchor 2 is provided with a plurality of blind holes 201 at equal intervals.

[0030] When disassembling or assembling the outer anchor 2, the stud of the double-ended stud wrench can be inserted into the blind hole 201, and then the outer anchor 2 can be rotated by the double-ended stud wrench.

[0031] In this embodiment, the upper part of the fixed bushing 1 is provided with a fixed end face 101, and the lower end of the outer wall of the fixed bushing 1 is provided with a fixed end head 103. The upper part of the fixed end head 103 is a frustum structure with a smaller upper part and a larger lower part. The outer diameter of the fixed end face 101 is larger than the outer diameter of the fixed end head 103.

[0032] An injection hole 102 is provided on the fixed end face 101, and the distance from the axis of the injection hole 102 to the axis of the fixed bushing 1 is not less than the outer diameter of the fixed end 103.

[0033] like Figure 1 , Figure 3 As shown, when installing the fixing bushing 1, an anchoring pile hole 9 needs to be drilled on the rock surface first. The inner diameter of the anchoring pile hole 9 is larger than the outer diameter of the fixing end 103 and smaller than the outer diameter of the fixing end face 101, so that the lower end face of the fixing end face 101 can be opened at the upper edge of the anchoring pile hole 9. Then, concrete is poured into the gap between the fixing bushing 1 and the anchoring pile hole 9 through the grouting hole 102. After the concrete solidifies, the fixing bushing 1 can be fixed to the rock mass. Since the distance from the axis of the grouting hole 102 to the axis of the fixing bushing 1 is not less than the outer diameter of the fixing end 103, it can be ensured that the concrete can be smoothly poured into the gap between the fixing bushing 1 and the anchoring pile hole 9.

[0034] This embodiment is further configured to include a protective cover 7, which is snapped onto the upper edge of the fixed bushing 1. The top of the protective cover 7 is provided with an opening 701, and a movable cover 702 is provided above the opening 701. The movable cover 702 is hinged to the top of the protective cover 7. The outer diameter of the movable cover 702 is larger than the inner diameter of the opening 701, and the inner diameter of the opening 701 is not smaller than the outer diameter of the outer anchor 2.

[0035] By installing the protective cover 7, debris can be prevented from entering the fixed bushing.

[0036] This embodiment is further configured to include a protective cover 6, which is snapped into the opening 701. The protective cover 6 is provided with through holes 601 in the same number as the conical holes 402 of the inner anchor 4, and the anchor cable 5 passes through the through holes 601.

[0037] The protective cover 6 is pre-installed on the anchor cable 5 before connecting the anchor cable 5 and the anchor assembly. When connecting the anchor assembly to the fixed bushing 1, the movable cover 702 is opened first, so that the anchor assembly passes through the opening 701 and extends into the fixed bushing 1. After the anchor assembly is fixed, the protective cover 6 is then snapped into the inner wall of the opening 701 to prevent debris from entering the gap between the inner anchor 4 and the outer anchor.

[0038] In summary, by threading the anchor assembly to the fixed bushing 1, it is easier to remove the anchor assembly from the fixed bushing 1 and recycle the anchor cable and the anchor assembly; the threaded connection can withstand greater axial stress. When the anchor cable is under stress or tension, the stability of the anchor structure can be maintained. Furthermore, by adjusting the position of the anchor assembly within the fixed bushing 1, the tension or looseness of the anchor cable 5 can also be adjusted.

[0039] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0040] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A prestressed cable anchorage that is easy to disassemble, characterized in that, It includes a fixed bushing (1) and an anchor assembly, on which an anchor cable (5) is connected; The fixed bushing (1) is fixed to the rock mass through the anchor pile hole (9). The inner wall of the fixed bushing (1) is provided with internal threads. The anchor assembly includes an inner anchor (4) and an outer anchor (2). The inner anchor (4) and the outer anchor (2) are rotatably connected by a thrust bearing (3). The outer wall of the outer anchor (2) is provided with external threads and is screwed onto the inner wall of the fixed bushing (1) through the external threads. The inner anchor (4) is provided with multiple conical holes (402). A conical elastic clip (8) is fitted inside the conical hole (402). The anchor cable (5) passes through the inner wall of the elastic clip (8) and is connected to the inner anchor (4) through the elastic clip (8).

2. The prestressed cable anchorage that is easy to disassemble according to claim 1, characterized in that, The outer anchor (2) has a first step (202) on its inner wall and the inner anchor (4) has a second step (401) on its outer wall. The upper end face of the outer ring of the thrust bearing (3) is in contact with the first step (202) and the lower end face of the inner ring of the thrust bearing (3) is in contact with the second step (401).

3. The prestressed cable anchorage that is easy to disassemble according to claim 1, characterized in that, The upper end face of the external anchor (2) is provided with multiple blind holes (201) at equal intervals.

4. A prestressed cable anchorage that is easy to disassemble according to claim 1, characterized in that, The upper part of the fixed bushing (1) is provided with a fixed end face (101), and the lower end of the outer wall of the fixed bushing (1) is provided with a fixed end head (103). The upper part of the fixed end head (103) is a frustum structure with a smaller upper part and a larger lower part. The outer diameter of the fixed end face (101) is larger than the outer diameter of the fixed end head (103).

5. A prestressed cable anchorage that is easy to disassemble according to claim 4, characterized in that, A filling hole (102) is provided on the fixed end face (101), and the distance from the axis of the filling hole (102) to the axis of the fixed bushing (1) is not less than the outer diameter of the fixed end (103).

6. A prestressed cable anchorage that is easy to disassemble according to claim 1, characterized in that, It also includes a protective cover (7), which is snapped onto the upper edge of the fixed bushing (1). The top of the protective cover (7) is provided with an opening (701), and a movable cover (702) is provided above the opening (701). The movable cover (702) is hinged to the top of the protective cover (7). The outer diameter of the movable cover (702) is larger than the inner diameter of the opening (701), and the inner diameter of the opening (701) is not smaller than the outer diameter of the outer anchor (2).

7. A prestressed cable anchorage that is easy to disassemble according to claim 1, characterized in that, It also includes a protective cover (6), which is snapped into the opening (701). The protective cover (6) has a number of through holes (601) equal to the number of tapered holes (402) of the inner anchor (4), and the anchor cable (5) passes through the through holes (601).

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