A pressure type carbon fiber cable anchorage device and anchoring method

Abstract

The application discloses a pressure type carbon fiber anchor cable device and an anchoring method, relates to the technical field of anchor cable support, and comprises an anchoring section, a free section and a tensioning section. The carbon fiber bundle of the ground tensioning section is anchored by using an anchoring assembly; the steel strand bundle of the underground anchoring section is anchored in the rock-soil body by using a pressure bearing plate; the carbon fiber anchor cable body is formed into a non-bonding section by installing a PVC hard sleeve pipe and a heat shrinkable pipe; the steel strand anchor cable body is formed into a non-bonding section by installing a plastic sheath and smearing grease; and the carbon fiber bundle and the steel strand bundle are connected through a combined anchor. The carbon fiber bundle is used to replace the steel strand bundle, so that the corrosion resistance and durability of the anchor cable are improved; and the carbon fiber bundle and the steel strand bundle are connected through the combined anchor, so that the problem of poor compression shear resistance of the anchoring section of the carbon fiber anchor cable is solved.

Description

Technical Field

[0001] This invention relates to the field of anchor cable support technology, specifically to carbon fiber anchor cable solutions. Background Technology

[0002] Currently, prestressed anchor cables are commonly used for reinforcement and support of rock masses with broken piles and steep slopes. Compared with the steel strand bundles in traditional prestressed anchor cables, carbon fiber bundles have advantages such as strong corrosion resistance, high tensile strength, light weight, and stable performance. Therefore, replacing steel strands with carbon fiber bundles can significantly improve the durability of anchor cables and better meet the safety and quality requirements of slope reinforcement.

[0003] Pressure-type anchor cables effectively utilize the fact that the compressive strength of grout and soil is significantly better than its tensile strength, improving the stress environment of the anchor cable and thus enhancing its durability and anchoring effect.

[0004] However, due to the weak compressive shear resistance of carbon fiber materials, if a traditional steel strand anchor cable structure is used, the carbon fiber bundle is prone to compressive shear cracking under high stress. Summary of the Invention

[0005] In view of the problems faced by existing carbon fiber anchor cable structures, the purpose of this invention is to provide a pressure-type carbon fiber anchor cable device and a corresponding anchoring method based on the pressure-type carbon fiber anchor cable device, so as to solve the problem that carbon fiber bundles are not suitable for pressure-type anchor cable structures and realize the use of carbon fiber bundles to replace steel strand bundles.

[0006] To achieve the above objectives, the present invention provides a pressure-type carbon fiber anchor cable device, comprising: an anchoring section, a free section, and a tensioning section;

[0007] The anchoring section is composed of unbonded steel strand bundles and is anchored by a pressure plate;

[0008] The free section is composed of unbonded carbon fiber bundles, and the unbonded carbon fiber bundles in the free section are connected to the unbonded steel strand bundles in the anchoring section by a combined anchor.

[0009] The tensioning section is composed of unbonded carbon fiber bundles and is anchored using anchoring components.

[0010] Furthermore, the anchoring components in the tensioning section are anchored using an internally conical cold-cast anchor, which is filled with a filler material composed of high-temperature modified epoxy resin, steel grit, and additives; a wedge-shaped block is added between the carbon fiber bundle and the filler material for anchoring.

[0011] Furthermore, the unbonded steel strand bundles in the anchoring section are anchored through the pressure plate using extrusion anchors.

[0012] Furthermore, the unbonded steel strand bundle in the anchoring section is externally fitted with spiral reinforcing bars.

[0013] Furthermore, the unbonded carbon fiber bundles in the free segment are formed by installing PVC rigid sleeves on the outside of the body and setting heat shrink tubing at both ends.

[0014] Furthermore, the unbonded steel strand bundle in the anchoring section is formed by installing a plastic sheath on the outside of the bundle body and applying grease.

[0015] Furthermore, the combined anchorage is composed of a cold-cast anchorage for anchoring carbon fiber bundles and a wedge-type anchorage for anchoring steel strand bundles; the cold-cast anchorage is filled with high-temperature modified epoxy resin, steel grit and additives, and a wedge block is added between the carbon fiber bundles and the filler for anchoring; the wedge-type anchorage is provided with an anchor plate and a wedge-type anchorage that cooperate with each other, the anchor plate allows the steel strand bundles to pass through, and the wedge-type anchorage anchors anchor the steel strand bundles that pass through the anchor plate.

[0016] Furthermore, the clamp-type anchor is provided with a cover plate to protect the steel strand bundle outside the anchor plate.

[0017] To achieve the above objectives, the present invention provides an anchoring method based on a pressure-type carbon fiber anchor cable, comprising:

[0018] First, the steel strand bundles in the underground anchorage section of the pressure-type carbon fiber anchor cable are anchored in the rock and soil using a pressure plate;

[0019] Next, the carbon fiber bundles in the free section of the pressure-type carbon fiber anchor cable are connected to the steel strand bundles in the underground anchoring section through a modular assembly.

[0020] Finally, the carbon fiber anchor cables in the ground tensioning section of the pressure-type carbon fiber anchor cable are anchored using anchoring components and then tensioned.

[0021] Furthermore, in the anchoring method, during anchor cable tensioning, corresponding anchor plates are installed on the anchoring components in the tensioning section and are tightly attached to the concrete panel; upon completion of pre-tensioning, tensioning locking is achieved by locking nuts.

[0022] Compared with the prior art, the solution provided by the present invention has the following advantages and positive effects:

[0023] (1) In view of the poor corrosion resistance of steel strand bundles in traditional prestressed anchor cables, this solution replaces steel strands with carbon fiber bundles that are highly corrosion resistant, have high tensile strength, are lightweight and have more stable performance. This can greatly improve the durability of anchor cables and better meet the safety and quality requirements of slope reinforcement.

[0024] (2) The anchor cable structure provided by this scheme adopts the pressure type as a whole, and the anchoring section adopts the pressure plate. It effectively utilizes the characteristics that the compressive strength of the grout and the soil is significantly better than the tensile strength, improves the stress environment of the anchor cable, and thus improves the durability and anchoring effect of the anchor cable.

[0025] (3) In this scheme, the anchoring section adopts steel strand body, which avoids the carbon fiber bundle from compressive shear cracking under high stress. At the same time, the carbon fiber cable body and steel strand body are connected by a combined anchor, which gives full play to the characteristics of strong corrosion resistance and high tensile strength of carbon fiber bundle and high compressive strength of steel strand bundle, and improves the durability and anchoring effect of anchor cable. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a structural example diagram of the pressure-type carbon fiber anchor cable device in an embodiment of the present invention;

[0028] Figure 2 This is an example diagram of the carbon fiber bundle anchorage in the pressure-type carbon fiber anchor cable device of the present invention;

[0029] Figure 3 This is an example diagram of the steel strand bundle anchorage of the pressure-type carbon fiber anchor cable device in an embodiment of the present invention;

[0030] Figure 4 This is an example diagram of the combined anchor structure in the pressure-type carbon fiber anchor cable device of the present invention;

[0031] Figure 5 This is a schematic diagram of the connection between the carbon fiber bundle and the steel strand bundle in an example of the present invention. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0033] This invention provides a pressure-type carbon fiber anchor cable device, which solves the problem that carbon fiber bundles are not suitable for pressure-type anchor cable structures through an innovative structure, and uses carbon fiber bundles to replace steel strand bundles to solve the shortcomings of existing steel strand anchor cables, such as poor corrosion resistance and low durability.

[0034] Specifically, this pressure-type carbon fiber anchor cable device consists of three parts: an anchoring section, a free section, and a tensioning section.

[0035] The anchorage section is located underground and consists of unbonded steel strand bundles, which are anchored in the soil and rock mass using a bearing plate.

[0036] The tensioning section is located on the ground and consists of unbonded carbon fiber bundles, which are anchored using anchoring components.

[0037] The free section is located between the tensioning section and the anchoring section, and is specifically composed of unbonded carbon fiber bundles. The unbonded carbon fiber bundles in the free section are connected to the unbonded steel strand bundles in the anchoring section through a combined anchor, thereby forming an integral pressure-type carbon fiber anchor cable.

[0038] The pressure-type carbon fiber anchor cable device of the present invention will be described below with reference to relevant examples and accompanying drawings.

[0039] See Figure 1 The illustration shows a configuration example of a pressure-type carbon fiber anchor cable device provided in this invention. This pressure-type carbon fiber anchor cable device can be used for underground engineering support and reinforcement, improving the corrosion resistance, durability, and anchoring effect of traditional steel strand anchor cables.

[0040] Further reading Figures 2-4 ,in Figure 2 This invention illustrates an example structure of a carbon fiber bundle anchorage in a pressure-type carbon fiber anchor cable device. Figure 3 This invention illustrates an example structure of a steel strand bundle anchorage for a pressure-type carbon fiber anchor cable device. Figure 4 An example structure of a pressure-type carbon fiber anchor cable assembly connection device is shown in an embodiment of the present invention.

[0041] First, see Figure 1 The pressure-type carbon fiber anchor cable device provided in this invention mainly comprises five components: a cold-cast anchor 1 for anchoring carbon fiber bundles in the above-ground tensioning section, a free section carbon fiber bundle 3, a combined anchor consisting of the cold-cast anchor 1 and a wedge-type anchor 2, a steel strand bundle 4 for the underground anchoring section, and a pressure-bearing plate 5 for the anchoring section.

[0042] See further Figure 2 In this example, the cold-cast anchor 1 is mainly composed of components such as anchor cup 14, top cover 16, and bottom cover 15.

[0043] The anchor cup 14 here constitutes the overall structure of the cold-cast anchor 1, and is preferably an inner conical anchor cup 14. The inner conical anchor cup 14 is structured with a larger upper end and a smaller lower end, which causes the anchor cable to be under tension and the lower end to be under compression, increasing friction and effectively improving the anchoring effect.

[0044] Based on this, this example further provides a top cover 16 on the top of the anchor cup 14. The top cover 16 is fixed to the anchor cup 14 by bolts 13, and the bottom cover 15 is welded to the anchor cup 14. The inner conical anchor cup 14 is filled with a mixture of high-temperature modified epoxy resin, steel grit and additives 19. Based on this filler 19, the bonding effect can be improved, making the anchoring more secure.

[0045] As a further preferred embodiment, this example also adds a wedge block 17 and a pad block 18 between the carbon fiber bundle 3 and the filler 19 inside the anchor 1 to strengthen the anchoring. Here, the wedge block 17 cooperates with the inner conical anchor cup 14. As the wedge block 17 moves within the inner conical anchor cup 14 in a direction where the inner diameter of the anchor cup gradually decreases, the inner wall of the inner conical anchor cup 14 will gradually compress the wedge block 17, thereby gradually strengthening the anchoring effect on the carbon fiber bundle 3.

[0046] In this example, the interlocking wedge block 17 and pad block 18 can improve anchoring efficiency, increase friction when the carbon fiber bundle 3 is under tension, and as the tension increases, the wedge block 17 will be under tension due to the friction between the carbon fiber bundle 3 and the wedge block 17. After being under force, the wedge block 17 will cooperate with the inner conical anchor cup 14, and the inner conical anchor cup 14 will compress the wedge block 17, thereby achieving the effect of tightening as it is pulled.

[0047] See further Figure 3 In this example, the wedge-type anchor 2 is mainly composed of anchor cup 20, cover plate 21, anchor plate 22, and wedge-type anchor 24.

[0048] Specifically, the anchor cup 20 in this clamp-type anchor 2 constitutes the main body of the entire clamp-type anchor 2.

[0049] At the top of the anchor cup 20, the top cover 25 is fixed to the anchor cup 20 with bolts 23; the anchor cup 20 is provided with a cooperating anchor plate 22 and a wedge-type anchor 24. The anchor plate 22 allows the steel strand bundle 4 to pass through, while the wedge-type anchor 24 anchors the steel strand bundle passing through the anchor plate. In this way, the steel strand bundle 4 inside the anchor cup 20 passes through the anchor plate 22 and is anchored by the wedge-type anchor 24.

[0050] Based on this, this example further provides a corresponding cover plate 21 inside the anchor cup 20. The cover plate 21 is positioned relative to the anchor plate 22 and is used to protect the steel strand bundle 4 outside the anchor plate.

[0051] For example, the cover plate 21 is entirely round and is pressed directly into the anchor cup 20, thereby effectively covering the outer steel strand bundle 4 of the anchor plate and protecting it. This structure of the cover plate 21 is convenient to operate and fits well against the inner wall of the anchor cup 20, thus covering the outer steel strand bundle 4 of the anchor plate and protecting it from both the periphery and the top without affecting its distribution.

[0052] In this example, a combined anchorage consisting of a cold-cast anchorage 1 and a wedge-type anchorage 2 is used for the connection between the free section carbon fiber cable bundle 3 and the underground anchorage section steel strand bundle 4 (e.g., Figure 4 (As shown).

[0053] See Figure 4 and Figure 5 When constructing a combined anchor, external threads are engraved on the outside of the cold-cast anchor 1, and matching internal threads are engraved in the anchor cup of the wedge-type anchor 2. In this way, the cold-cast anchor 1 can be screwed into the anchor cup of the wedge-type anchor 2 along the threads and tightened to form a combined anchor.

[0054] In this composite anchorage, the cold-cast anchorage is structurally similar to that described above. The inner conical anchor cup is filled with high-temperature modified epoxy resin, steel grit, and additives. Wedge blocks and pads are added between the carbon fiber bundle and the filler material inside the inner conical anchor cup to anchor the carbon fiber cable bundle 3.

[0055] The clamp-type anchor 2 in this combined anchor system is structurally the same as described above. Within the area of ​​the clamp-type anchor 2 used to anchor the steel strand bundle 4, the steel strand bundle 4 passes through the anchor plate 23 and is anchored using the clamp-type anchor 24. At the same time, the steel strand bundle outside the anchor plate is protected by the cover plate 21.

[0056] Based on this, in this example, a rubber gasket 26 is provided between the cold-cast anchor 1 and the wedge-type anchor 2 in the combined anchor. The rubber gasket 26 forms a sealing structure between the cold-cast anchor 1 and the wedge-type anchor 2, improving the reliability of the fit between the two. At the same time, based on its own elasticity, it synchronously forms a buffer layer between the cold-cast anchor 1 and the wedge-type anchor 2 to avoid hard contact between the two and cause damage.

[0057] Further integration Figure 1 As shown, in this example, the free section carbon fiber anchor cable body 3 is formed into an unbonded section by installing PVC rigid sleeve 9 and heat shrink tubing 8.

[0058] Specifically, in this example, a PVC rigid sleeve 9 is installed on the outside of the carbon fiber anchor cable body 3, and heat shrink tubing 8 is set at both ends to form an unbonded section.

[0059] By installing a PVC rigid sleeve 9 on the outside of the carbon fiber anchor cable body 3, the lock body can be effectively prevented from sticking to the grout, ensuring that the free end lock body can be stretched freely; at the same time, the thermoplastic pipes set at both ends can play a sealing role, preventing the grout from flowing into the PVC rigid sleeve 9 and causing structural damage.

[0060] In this example, for the steel strand anchor cable body 4, a plastic sheath is further installed on its outer side and grease 10 is applied to form an unbonded section, thereby preventing the anchor body from sticking to the grout and allowing it to be stretched freely.

[0061] The following details the implementation process of anchoring using the pressure-type carbon fiber anchor cable device presented in this example.

[0062] See Figure 1The pressure-type carbon fiber anchor cable device formed in this example is divided into three parts: the anchoring section composed of unbonded steel strand bundles, the free section composed of unbonded carbon fiber bundles, and the tensioning section.

[0063] Therefore, the anchoring process based on this pressure-type carbon fiber anchor cable device is as follows:

[0064] First, the steel strand bundles in the underground anchoring section are anchored in the soil and rock using a bearing plate; the unbonded carbon fiber bundles in the free section are connected to the unbonded steel strand bundles in the underground anchoring section through a combined component; at the same time, the carbon fiber anchor cables in the above-ground tensioning section are anchored using an anchoring component.

[0065] Specifically, the anchoring section steel strand bundle 4 is anchored in the soil and rock mass using a bearing plate 5, and the steel strand bundle 4 passes through the bearing plate 5 and is anchored using a compression anchor 12.

[0066] To improve the compressive shear resistance of the anchorage section and prevent it from being damaged by compressive shear, this example further provides spiral steel bars 11 outside the steel strand bundle 4 in the anchorage section.

[0067] Meanwhile, for the anchoring section steel strand bundle 4, a plastic sheath is further installed on its outer side and grease 10 is applied to form an unbonded section.

[0068] Next, the carbon fiber cable bundle 3 in the free section is connected to the steel strand bundle 4 in the anchoring section through a combined anchor.

[0069] In this process, a wedge-type anchor is used in a combined anchorage to anchor the steel strand bundle 4. Specifically, the steel strand bundle 4 passes through the pressure plate in the wedge-type anchorage and is anchored using a compression anchor.

[0070] For the free section of the carbon fiber cable bundle 3, both ends are anchored using cold-cast anchors with external threads.

[0071] For carbon fiber cable bundle 3, this example also forms an unbonded section on its outer side by installing PVC rigid tubing and heat shrink tubing.

[0072] Next, the cold-cast anchorage anchored at one end of the carbon fiber cable bundle 3 is screwed into the anchor cup of the wedge anchorage along the thread, and the connection is completed by tightening to connect the carbon fiber cable bundle 3 in the free section with the steel strand bundle 4 in the anchoring section.

[0073] Next, the corresponding anchor plates 7 and locking nuts 6 are screwed onto the cold-cast anchorage anchored at the other end of the carbon fiber cable bundle 3 to form the corresponding tensioning section.

[0074] When tensioning the anchor cable, the anchor plate 7 is screwed into the cold-cast anchor 1 of the tensioning section along the thread and pressed against the concrete panel; when pre-tensioning is completed, the locking nut 6 is screwed into the anchor 1 along the thread and pressed against the anchor plate 7. After tightening the nut, the tensioning is completed and locked.

[0075] As can be seen from the above examples, the pressure-type carbon fiber anchor cable device solution provided by the present invention uses carbon fiber bundles instead of steel strand bundles to solve the shortcomings of poor corrosion resistance and low durability of existing steel strand anchor cables; at the same time, by optimizing the anchor cable structure, it solves the problem that carbon fiber bundles are not suitable for pressure-type anchor cable structures; thereby improving the durability and anchoring effect of the anchor cable.

[0076] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure-type carbon fiber anchor cable device, characterized in that, include: Anchorage section, free section and tension section; The anchoring section is composed of unbonded steel strand bundles and is anchored by a pressure plate; the unbonded steel strand bundles in the anchoring section pass through the pressure plate and are anchored by extrusion anchors; spiral steel bars are installed on the outside of the unbonded steel strand bundles in the anchoring section. The free section is composed of unbonded carbon fiber bundles, and the unbonded carbon fiber bundles in the free section are connected to the unbonded steel strand bundles in the anchoring section by a combined anchor; the combined anchor is composed of a cold-cast anchor for anchoring the carbon fiber bundles and a wedge-type anchor for anchoring the steel strand bundles. The cold-cast anchor is filled with high-temperature modified epoxy resin, steel grit, and additives, and a wedge block is added between the carbon fiber bundle and the filler for anchoring. The wedge block cooperates with the inner conical anchor cup in the cold-cast anchor. As the wedge block moves in the inner conical anchor cup along the direction where the inner diameter of the anchor cup gradually decreases, the inner wall of the inner conical anchor cup will gradually compress the wedge block, which will gradually strengthen the anchoring effect on the carbon fiber bundle. The clamp-type anchor is provided with mutually cooperating anchor plates and clamps. The anchor plate allows the steel strand bundle to pass through, and the clamp-type anchor anchor anchors anchor the steel strand bundle passing through the anchor plate. The tensioning section is composed of unbonded carbon fiber bundles and is anchored using anchoring components.

2. The pressure-type carbon fiber anchor cable device according to claim 1, characterized in that, The anchoring components in the tensioning section are anchored using an internally conical cold-cast anchor, which is filled with a filler material composed of high-temperature modified epoxy resin, steel grit and additives; a wedge-shaped block is added between the carbon fiber bundle and the filler material for anchoring.

3. The pressure-type carbon fiber anchor cable device according to claim 1, characterized in that, The unbonded carbon fiber bundles in the free section are formed by installing PVC rigid sleeves on the outside of the body and setting heat shrink tubing at both ends.

4. The pressure-type carbon fiber anchor cable device according to claim 1, characterized in that, The unbonded steel strand bundle in the anchoring section is formed by installing a plastic sheath on the outside of the bundle body and applying grease.

5. The pressure-type carbon fiber anchor cable device according to claim 1, characterized in that, The clamp-type anchor is equipped with a cover plate to protect the steel strand bundle outside the anchor plate.

6. An anchoring method based on the pressure-type carbon fiber anchor cable device according to any one of claims 1-5, characterized in that, include: First, the steel strand bundles in the underground anchorage section of the pressure-type carbon fiber anchor cable are anchored in the rock and soil using a pressure plate; Next, the carbon fiber bundles in the free section of the pressure-type carbon fiber anchor cable are connected to the steel strand bundles in the underground anchoring section through a combined anchor. Finally, the carbon fiber anchor cables in the ground tensioning section of the pressure-type carbon fiber anchor cable are anchored using anchoring components and then tensioned.

7. The anchoring method according to claim 6, characterized in that, In the anchoring method, during anchor cable tensioning, corresponding anchor plates are installed on the anchoring components in the tensioning section and are tightly attached to the concrete panel; upon completion of pre-tensioning, tensioning locking is achieved by locking nuts.

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