Expandable anchor cable structure and construction method thereof

Abstract

The invention discloses an expandable anchor cable structure and a construction method thereof. The anchor cable structure comprises a steel strand; the anchoring mechanism comprises a fixed part, a movable part and an unfolding mechanism, the fixed part is fixedly installed on the steel strand, the movable part is arranged on the steel strand in a sliding mode, the fixed part is provided with a first through hole, the movable part is provided with a second through hole, and the distances from all points or lines on the inner wall of the second through hole to the central axis of the second through hole are not completely equal; the unfolding mechanism is movably connected with the movable part, and the movable part approaches the fixed part and can drive the unfolding mechanism to unfold; the grouting pipe can penetrate through the first through hole and the second through hole, and a locking piece matched with the second through hole in shape is arranged at the end of the grouting pipe. The anchor cable structure is unfolded outwards through the unfolding mechanism, the contact area of the anchoring mechanism to a soil body can be increased, and the probability that the anchoring mechanism is disengaged from an anchor hole is reduced; and the steel strand is erected through the anchoring mechanism, so that the steel strand can be prevented from falling to the inner wall of an anchor hole. The invention relates to the technical field of slope reinforcement.

Description

Technical Field

[0001] The present application relates to the technical field of slope reinforcement, and in particular to an expandable anchor cable structure and a construction method thereof. Background Art

[0002] Anchor cable is an engineering structure commonly used to reinforce slopes. It is mainly formed by injecting cement slurry or cement mortar into the anchor section of high-strength steel strands. After the grouting material reaches the strength specified in the design tensioning, a through-hole jack is used to tension the steel strands to apply a certain prestress. The soil of the slope is further squeezed under the force of the anchor cable, thereby increasing the compactness of the soil and improving the stability of the slope.

[0003] The anchor cable structure is mainly composed of anchor heads, steel strands and anchors. After the steel strands are prestressed, the outer side of the steel strands is fixed to the slope surface through anchors, and the anchor head on the other side is anchored in the stable slope within the sliding surface. The anchor cable structure is tightened under the action of the external prestressing equipment, directly generating anti-slip resistance on the sliding surface. The application of prestress increases the anti-slip friction resistance, puts the structural surface in a compressed state, and improves the overall stability and anti-slip performance of the slope.

[0004] However, it was found in actual construction that the current anchors are cylindrical in shape, and they mainly rely on the injection of cement slurry or cement mortar to anchor with the soil, but there is still a risk of loosening under a large anchoring force. The anchor cable generally needs to install a plastic isolation bracket every two meters of the steel strand, and then manually put the anchor cable into the anchor hole by multiple people. The role of the plastic isolation bracket is to raise the steel strand to reduce its bending in the anchor hole and prevent the steel strand from straightening again during subsequent tensioning and generating lateral force on the concrete. However, the plastic isolation bracket will scratch the soil in the anchor hole, which is not convenient for construction on the one hand, and will also loosen the soil inside the anchor hole on the other hand, affecting the final anchoring effect. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an expandable anchor cable structure, which can improve the anchoring stability of the anchor cable, can raise the steel strand in the anchor hole, and is easy to construct.

[0006] The present application also proposes a construction method for the above-mentioned expandable anchor cable structure.

[0007] The expandable anchor cable structure according to the first embodiment of the present application includes:

[0008] Steel strand;

[0009] The anchoring mechanism comprises a fixed part, a movable part and an unfolding mechanism, wherein the fixed part is fixedly mounted on the steel strand, the movable part can be slidably arranged on the steel strand, the fixed part is provided with a first through hole, the movable part is provided with a second through hole, and the distances from various points or lines on the inner wall of the second through hole to the central axis of the second through hole body are not completely equal; the unfolding mechanism is movably connected to the movable part, and the movable part can drive the unfolding mechanism to unfold when it approaches the fixed part;

[0010] A grouting pipe, which can pass through the first through hole and the second through hole, and the end of the grouting pipe is provided with a locking piece adapted to the shape of the second through hole; when the locking piece is rotated to a state adapted to the second through hole, it can pass through the second through hole, and the locking piece can pass through the first through hole.

[0011] The expandable anchor cable structure according to the embodiment of the present application has at least the following beneficial effects: by expanding outwardly through the unfolding mechanism, the contact area of ​​the anchoring mechanism with the soil can be increased, thereby reducing the probability of the anchoring mechanism coming out of the anchor hole under the action of tension; and by raising the steel strand through the anchoring mechanism, it can be prevented from falling to the inner wall of the anchor hole.

[0012] According to some embodiments of the present application, both the fixing member and the movable member are provided with a slot for clamping the steel strand, and a limiting structure is provided in the slot of the fixing member to clamp with the steel strand.

[0013] According to some embodiments of the present application, the fixing member and the movable member are provided with a plurality of slots distributed in a circular array, and the steel strands are multiple in number and are respectively inserted into each of the slots.

[0014] According to some embodiments of the present application, the unfolding mechanism includes a first connecting rod, a second connecting rod and a wing plate, the first connecting rod is hinged to the fixed part, the second connecting rod is hinged to the movable part, and the first connecting rod and the second connecting rod are both hinged to the wing plate; the movable part is close to the fixed part to drive the first connecting rod and the second connecting rod to rotate and push the wing plate outward.

[0015] According to some embodiments of the present application, the number of the first connecting rod and the number of the second connecting rod are both two, the two first connecting rods are arranged parallel to each other, and the two second connecting rods are arranged parallel to each other.

[0016] According to some embodiments of the present application, the lengths of the first connecting rod and the second connecting rod are not equal, and the wing plate forms an acute angle with the central axis of the movable part after being fully pushed out.

[0017] According to some embodiments of the present application, there are multiple deployment mechanisms and they are distributed in a circular array around the central axis of the movable part.

[0018] According to some embodiments of the present application, the second through hole includes a circular hole and a square hole connected to each other, and the locking piece includes a cylindrical portion adapted to the circular hole and a locking portion adapted to the square hole; screwing the grouting pipe can cause the locking piece to rotate around the circular hole, and when the locking portion rotates to the square hole, the locking piece can pass through the second through hole.

[0019] According to some embodiments of the present application, the fixed part and the movable part are both in a frustum shape.

[0020] According to the second aspect of the present application, the construction method is used to construct the above-mentioned expandable anchor cable structure, comprising the following steps:

[0021] Inserting the steel strand and the grouting pipe into each of the anchoring mechanisms, the locking piece of the grouting pipe first passes through the first through hole of the fixing piece and then passes through the second through hole of the movable piece;

[0022] Arrange the anchoring mechanisms equidistantly, and securely connect the fixing members to the steel strands;

[0023] Put the assembled anchor cable and the grouting pipe into the anchor hole;

[0024] Opening the external grouting equipment to inject slurry into the grouting pipe, and slowly pulling the grouting pipe outward;

[0025] During the process of pulling out the grouting pipe, the locking member abuts against the second through hole of the movable member, driving the movable member to approach the fixing member, and the unfolding mechanism unfolds outward and abuts against the inner wall of the anchor hole;

[0026] Rotate the grouting pipe to rotate the locking piece to a position matching the second through hole, and continue to pull the grouting pipe outward to allow the locking piece to pass through the second through hole;

[0027] As the grouting pipe moves outward, the locking member then passes through the first through hole, and the current anchoring mechanism is deployed;

[0028] The grouting pipe continues to move outwards, driving the next anchoring mechanism to unfold, until all the anchoring mechanisms have been unfolded, and the grouting pipe is pulled out of the anchor hole;

[0029] Wait for the mud in the anchor hole to solidify and the anchoring is completed.

[0030] The construction method according to the embodiment of the present application has at least the following beneficial effects: while grouting is performed using the grouting pipe, each anchoring mechanism can be triggered in sequence and deployed during the process of pulling it outward, and the construction process is simple and efficient.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the technical solution disclosed in the present application and constitute a part of the specification. Together with the embodiments disclosed in the present application, they are used to explain the technical solution disclosed in the present application and do not constitute a limitation on the technical solution disclosed in the present application.

[0033] Figure 1 A three-dimensional diagram of the expandable anchor structure according to the first embodiment of the present application;

[0034] Figure 2 This is a schematic diagram of the expandable anchor cable structure after being deployed according to the first aspect of the present application;

[0035] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0036] Figure numerals: 100 - steel strand, 200 - anchoring mechanism, 210 - fixing part, 211 - first through hole, 220 - movable part, 221 - second through hole, 2211 - round hole, 2212 - square hole, 230 - unfolding mechanism, 231 - first connecting rod, 232 - second connecting rod, 233 - wing plate, 240 - slot, 300 - anchor head. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0038] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In the description of this application, "several" means more than one, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0041] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0042] The anchor cable structure is mainly composed of anchor heads, steel strands and anchors. After the steel strands are prestressed, the outer side of the steel strands is fixed to the slope surface through anchors, and the anchor head on the other side is anchored in the stable slope within the sliding surface. The anchor cable structure is tightened under the action of the external prestressing equipment, directly generating anti-slip resistance on the sliding surface. The application of prestress increases the anti-slip friction resistance, puts the structural surface in a compressed state, and improves the overall stability and anti-slip performance of the slope.

[0043] However, it was found in actual construction that the current anchors are cylindrical in shape, and they mainly rely on the injection of cement slurry or cement mortar to anchor with the soil, but there is still a risk of loosening under a large anchoring force. The anchor cable generally needs to install a plastic isolation bracket every two meters of the steel strand, and then manually put the anchor cable into the anchor hole by multiple people. The role of the plastic isolation bracket is to raise the steel strand to reduce its bending in the anchor hole and prevent the steel strand from straightening again during subsequent tensioning and generating lateral force on the concrete. However, the plastic isolation bracket will scratch the soil in the anchor hole, which is not convenient for construction on the one hand, and will also loosen the soil inside the anchor hole on the other hand, affecting the final anchoring effect.

[0044] In this regard, the present application proposes an expandable anchor cable structure, which can increase the contact area of ​​the anchor mechanism 200 with the soil by expanding outward through the expansion mechanism 230, and reduce the probability of the anchor mechanism 200 escaping from the anchor hole under the action of tension; and by raising the steel strand through the anchor mechanism 200, it can prevent it from falling to the inner wall of the anchor hole.

[0045] In addition, the present application also proposes a construction method for the above-mentioned expandable anchor cable structure. While grouting is performed using a grouting pipe, each anchoring mechanism 200 can be triggered in sequence and deployed during the process of pulling it outward, and the construction process is simple and efficient.

[0046] Reference Figure 1 and Figure 2 The expandable anchor cable structure in the embodiment of the first aspect of the present application comprises a steel strand 100, an anchoring mechanism 200 and a grouting pipe. The steel strand 100 is mainly used to bear tensile stress, and an anchor head 300 for inserting into the soil is installed at its end. The anchoring mechanism 200 is installed on the steel strand 100 to anchor the soil of the anchor hole. The grouting pipe passes through each anchoring mechanism 200 to perform grouting and curing in the anchor hole.

[0047] Specifically, refer to Figure 3 The anchoring mechanism 200 includes a fixed part 210, a movable part 220 and an unfolding mechanism 230. The fixed part 210 is fixedly installed on the steel strand 100, and the movable part 220 can be slidably arranged on the steel strand 100. The fixed part 210 is provided with a first through hole 211, and the movable part 220 is provided with a second through hole 221. It is worth noting that the distances from each point or line on the inner wall of the second through hole 221 to the central axis of the second through hole 221 are not completely equal, and the second through hole 221 can be elliptical, square, diamond or other irregular shapes. The unfolding mechanism 230 is movably connected to the movable part 220. The movable part 220 is close to the fixed part 210 to drive the unfolding mechanism 230 to unfold, thereby contacting the inner wall of the anchor hole to complete the anchoring function.

[0048] The grouting pipe can pass through the first through hole 211 and the second through hole 221, and the end of the grouting pipe is provided with a locking piece adapted to the shape of the second through hole 221; when the locking piece is rotated to a state adapted to the second through hole 221, it can pass through the second through hole 221, and the locking piece can pass through the first through hole 211.

[0049] The working principle of the expandable anchor cable structure is as follows: the locking piece at the end of the grouting pipe passes through the first through hole 211 of the fixed piece 210 and the second through hole 221 of the movable piece 220 in sequence, and the grouting pipe is continuously pulled outward while grouting, and the locking piece abuts against the second through hole 221 and pulls the movable piece 220 close to the fixed piece 210, driving the unfolding mechanism 230 to unfold outward. Then, the grouting pipe is rotated to rotate the locking piece to a position adapted to the second through hole 221, so that the locking piece can pass through the second through hole 221 and finally pass out of the first through hole 211, completing the separation of the grouting pipe from the anchoring mechanism 200.

[0050] Furthermore, both the fixed part 210 and the movable part 220 are provided with a slot 240 for clamping the steel strand 100, and a limiting structure is provided in the slot 240 of the fixed part 210 to clamp the steel strand 100. Moreover, the slots 240 on the fixed part 210 and the movable part 220 are provided in plurality and distributed in a circumferential array, and the number of steel strands 100 is plurality and is clamped in each slot 240 respectively.

[0051] Specifically, the specific structure of the deployment mechanism 230 includes a first connecting rod 231, a second connecting rod 232 and a wing plate 233. The first connecting rod 231 is hinged to the fixed member 210, the second connecting rod 232 is hinged to the movable member 220, and both the first connecting rod 231 and the second connecting rod 232 are hinged to the wing plate 233. The movable member 220 approaches the fixed member 210 to drive the first connecting rod 231 and the second connecting rod 232 to rotate, and push the wing plate 233 outward, thereby completing the deployment of the deployment mechanism 230.

[0052] Furthermore, there are two first connecting rods 231 and two second connecting rods 232, and the two first connecting rods 231 are arranged parallel to each other, and the two second connecting rods 232 are arranged parallel to each other. By increasing the number of the first connecting rods 231 and the second connecting rods 232, the structural stability of the deployment mechanism 230 can be improved, and the probability of damage to the deployment mechanism 230 under tensile stress during the anchoring process can be reduced.

[0053] Optionally, the lengths of the first connecting rod 231 and the second connecting rod 232 are not equal, and the wing plate 233 forms an acute angle with the central axis of the movable part 220 after being fully pushed out, so that the outward-turned wing plate 233 can be inserted into the soil on the inner wall of the anchor hole, further preventing the anchor cable from falling out.

[0054] Furthermore, there are multiple deployment mechanisms 230 and they are distributed in a circular array around the central axis of the movable part 220, so that when each deployment mechanism 230 is deployed, each steel strand 100 and grouting pipe can be installed in the center of the anchor hole.

[0055] The specific structure of the second through hole 221 includes a circular hole and a square hole connected to each other. The locking piece includes a cylindrical portion adapted to the circular hole and a locking portion adapted to the square hole. The locking piece can be rotated around the circular hole by twisting the grouting pipe, and when the locking portion is rotated to the square hole, the locking piece can pass through the second through hole 221.

[0056] Furthermore, the fixing member 210 and the movable member 220 are both truncated cone-shaped. When the anchoring mechanism 200 is placed in the anchor hole, the truncated cone-shaped fixing member 210 and the movable member 220 can reduce the scratches between their outer surfaces and the inner wall of the anchor hole, thereby facilitating installation.

[0057] A construction method in an embodiment of the second aspect of the present application is to construct the above-mentioned expandable anchor cable structure, comprising the following steps:

[0058] S100. Insert the steel strand 100 and the grouting pipe into each anchor mechanism 200, and the locking member of the grouting pipe first passes through the first through hole 211 of the fixing member 210, and then passes through the second through hole 221 of the movable member 220;

[0059] S200. Arrange the anchoring mechanisms 200 equidistantly, and fix the fixing member 210 to the steel strand 100;

[0060] S300. Place the assembled anchor cable and grouting pipe into the anchor hole;

[0061] S400. Open the external grouting equipment to inject slurry into the grouting pipe, and slowly pull the grouting pipe outward;

[0062] S500. During the process of pulling out the grouting pipe, the locking member abuts against the second through hole 221 of the movable member 220, driving the movable member 220 close to the fixing member 210, and the expansion mechanism 230 is then expanded outward and abuts against the inner wall of the anchor hole;

[0063] S600. Rotate the grouting pipe to rotate the locking member to a position that matches the second through hole 221, which means that the locking member can pass through the second through hole 221, and continue to pull the grouting pipe outward to allow the locking member to pass through the second through hole 221;

[0064] S700. As the grouting pipe moves outward, the locking member then passes through the first through hole 211, and the current anchoring mechanism 200 is deployed;

[0065] S800. The grouting pipe continues to move outward, driving the next anchoring mechanism 200 to unfold, until all anchoring mechanisms 200 have been unfolded, and the grouting pipe is pulled out from the anchor hole;

[0066] S900. Wait for the mud in the anchor hole to solidify and the anchoring is completed.

[0067] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. An expandable anchor cable structure, characterized in that: include: Steel strand; The anchoring mechanism comprises a fixed part, a movable part and an unfolding mechanism, wherein the fixed part is fixedly mounted on the steel strand, the movable part can be slidably arranged on the steel strand, the fixed part is provided with a first through hole, the movable part is provided with a second through hole, and the distances from various points or lines on the inner wall of the second through hole to the central axis of the second through hole body are not completely equal; the unfolding mechanism is movably connected to the movable part, and the movable part can drive the unfolding mechanism to unfold when it approaches the fixed part; A grouting pipe, which can pass through the first through hole and the second through hole, and the end of the grouting pipe is provided with a locking piece adapted to the shape of the second through hole; when the locking piece is rotated to a state adapted to the second through hole, it can pass through the second through hole, and the locking piece can pass through the first through hole.

2. The expandable anchor structure according to claim 1, characterized in that: The fixing member and the movable member are both provided with a slot for clamping the steel strand, and a limiting structure is provided in the slot of the fixing member to clamp the steel strand.

3. The expandable anchor cable structure according to claim 2, characterized in that: There are multiple slots on the fixed part and the movable part, which are distributed in a circular array. There are multiple steel strands, which are respectively inserted into the slots.

4. The expandable anchor cable structure according to claim 1, characterized in that: The unfolding mechanism includes a first connecting rod, a second connecting rod and a wing plate, the first connecting rod is hinged to the fixed part, the second connecting rod is hinged to the movable part, and the first connecting rod and the second connecting rod are both hinged to the wing plate; the movable part approaches the fixed part to drive the first connecting rod and the second connecting rod to rotate and push the wing plate outward.

5. The expandable anchor structure according to claim 4, characterized in that: The number of the first connecting rod and the number of the second connecting rod are both two, the two first connecting rods are arranged parallel to each other, and the two second connecting rods are arranged parallel to each other.

6. The expandable anchor cable structure according to claim 4, characterized in that: The lengths of the first connecting rod and the second connecting rod are not equal, and the wing plate forms an acute angle with the central axis of the movable part after being fully pushed out.

7. The expandable anchor structure according to any one of claims 4 to 6, characterized in that: There are multiple deployment mechanisms, which are distributed in a circular array around the central axis of the movable part.

8. The expandable anchor structure according to claim 1, characterized in that: The second through hole includes a circular hole and a square hole connected to each other, and the locking piece includes a cylindrical portion adapted to the circular hole and a locking portion adapted to the square hole; screwing the grouting pipe can cause the locking piece to rotate around the circular hole, and when the locking portion rotates to the square hole, the locking piece can pass through the second through hole.

9. The expandable anchor structure according to claim 1, characterized in that: The fixed part and the movable part are both in a truncated cone shape.

10. A construction method for the expandable anchor cable structure according to any one of claims 1 to 9, characterized in that: include: Inserting the steel strand and the grouting pipe into each of the anchoring mechanisms, the locking piece of the grouting pipe first passes through the first through hole of the fixing piece and then passes through the second through hole of the movable piece; Arrange the anchoring mechanisms equidistantly, and securely connect the fixing members to the steel strands; Put the assembled anchor cable and the grouting pipe into the anchor hole; Opening the external grouting equipment to inject slurry into the grouting pipe, and slowly pulling the grouting pipe outward; During the process of pulling out the grouting pipe, the locking member abuts against the second through hole of the movable member, driving the movable member to approach the fixing member, and the unfolding mechanism unfolds outward and abuts against the inner wall of the anchor hole; Rotate the grouting pipe to rotate the locking piece to a position matching the second through hole, and continue to pull the grouting pipe outward to allow the locking piece to pass through the second through hole; As the grouting pipe moves outward, the locking member then passes through the first through hole, and the current anchoring mechanism is deployed; The grouting pipe continues to move outwards, driving the next anchoring mechanism to unfold, until all the anchoring mechanisms have been unfolded, and the grouting pipe is pulled out of the anchor hole; Wait for the mud in the anchor hole to solidify and the anchoring is completed.

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