An anchor cable construction structure using a galvanized anchor pad and grouting material to cast an anchor pier

Abstract

The utility model provides a kind of anchor cable construction structure using galvanized anchor pad and grouting material to pour anchor pier, including anchor cable, anchor pier, anchor pad, anchor plate assembly;The end of the anchor cable is locked and fixed on anchor pier by the anchor plate assembly, anchor pad is arranged between the anchor plate assembly and anchor pier;The surface of the anchor pad is provided with zinc plating layer, the zinc plating layer is coated with a layer of epoxy waterproof paint;The anchor pier is the anchor pier poured by high early-strength premixed shrinkage-compensating cement-based material. This structure solves the systemic anticorrosion problem of anchor cable, optimizes construction progress, and improves construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of hydropower station construction technology, specifically to an anchor cable construction structure that uses galvanized anchor plates and grouting material to cast anchor blocks. Background Technology

[0002] Prestressed anchor cables are widely used in large-scale engineering projects both domestically and internationally, including slope protection, tunnel rock mass reinforcement, underground engineering, foundation treatment, retaining wall construction, and bridge construction. The related anchor cable tensioning technology is relatively mature. To help projects withstand increasingly complex and extreme climate changes and ensure good performance in increasingly harsh working environments in the future, more attention is being paid to corrosion protection measures during the construction of prestressed anchor cables.

[0003] Prestressed anchor cables are extensively used to reinforce rock masses in the walls of underground powerhouses and tailrace surge chambers of hydroelectric power stations. After the power station is built, these areas will be constantly submerged or damp. Over time, water erosion will cause corrosive agents such as SO4-, Cl-, NO3-, HCO3-, and corrosive microorganisms to penetrate the anchor structure, corroding internal components such as the steel strands. Currently, conventional anchor cable construction has two main drawbacks:

[0004] (1) Conventional anchor cable corrosion prevention measures focus on the corrosion prevention of steel strands, mainly by coating or wrapping the steel strands with anti-corrosion materials such as epoxy resin. Corresponding research on anchor cable corrosion has received widespread attention in engineering practices such as cross-sea bridge construction and underground coal mine construction at home and abroad. In fact, in relatively complex and harsh working environments, especially in prestressed anchor cables working in areas with changing water levels such as underground powerhouses of hydropower stations, the corrosion is often most severe at the joint between the anchor plate and the steel strand. Correspondingly, the corrosion prevention measures pay less attention to the corrosion prevention of the anchor plate. As a key component in anchor cable construction, the anchor plate is mainly made of iron or steel. Affected by corrosive factors, rust pits are easily generated at the joint between the anchor plate and the steel strand. This will lead to a significant decrease in the compressive and tensile strength of the overall anchor cable structure, a reduction in plasticity, and ultimately the failure of the anchor cable structure, causing great safety hazards to the project.

[0005] (2) The conventional anchor pier pouring process takes a long time to allow the anchor pier to develop strength, which may cause on-site personnel and equipment to stagnate, seriously affecting the construction schedule, resulting in waste of personnel and equipment, and reducing construction organization efficiency. For example, in the construction of prestressed anchor cables in the water level change area of ​​the underground powerhouse, it is necessary to continuously excavate the silt material formed by the flood impact in the powerhouse. If the anchor cable construction above has not been completed, the subsequent excavation and shotcrete support, concrete pouring and other construction links will be hindered.

[0006] To address the systemic corrosion issues of anchor cables and to optimize construction progress, a new construction structure is proposed. Utility Model Content

[0007] The purpose of this utility model is to address the shortcomings of existing technologies by providing an anchor construction structure that uses galvanized anchor plates and grouting material to cast anchor blocks, thereby solving the systematic corrosion problem of anchor cables and optimizing the construction progress.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: an anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks, including anchor cables, anchor blocks, anchor plates, and anchor plate assemblies; the end of the anchor cable is locked and fixed to the anchor block by the anchor plate assembly, and an anchor plate is provided between the anchor plate assembly and the anchor block;

[0009] The surface of the anchor plate is provided with a galvanized layer, and the galvanized layer is coated with an epoxy waterproof paint.

[0010] The anchor pier is an anchor pier cast from high early strength premixed shrinkage-compensating cement-based material.

[0011] Preferably, the anchor plate assembly includes an anchor plate, an extrusion sleeve, a concrete protective head, and a PVC protective sleeve. The anchor plate and the extrusion sleeve cooperate to lock the end of the anchor cable. The concrete protective head wraps around the anchor plate to protect the anchor plate, and the PVC protective sleeve wraps around the concrete protective head to serve as an anti-corrosion layer.

[0012] Preferably, the outer peripheral surface of the anchor block is an inclined surface, and the side of the inclined surface near the anchor plate has a reduced dimension.

[0013] Preferably, the anchor plate is a prefabricated accessory with multiple specifications. The specifications of a set of anchor plates include at least one of 600mm×600mm×50mm, 600mm×600mm×38mm, and 310mm×310mm×50mm.

[0014] Preferably, the base material of the anchor block is SikaGrout212.

[0015] Preferably, a pouring pipe is provided at the anchor pier.

[0016] Preferably, the flowability of the SikaGrout212 material satisfies an initial value ≥290mm and a 30-minute retention value ≥260mm.

[0017] Preferably, the compressive strength of the SikaGrout212 material meets the following requirements: ≥45MPa after 1 day, ≥70MPa after 3 days, and ≥90MPa after 28 days.

[0018] Preferably, the narrow end of the anchor block is equal in size to the anchor plate.

[0019] Preferably, the thickness of the anchor block is at least three times the thickness of the anchor plate.

[0020] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model targets the parts of the prestressed anchor cable that are most susceptible to corrosion in areas with fluctuating water levels, and can achieve twice the result with half the effort.

[0021] Specifically, galvanizing the anchor plates of prestressed anchor cables and applying epoxy waterproof paint will better protect the performance of the prestressed anchor cables, which will effectively reduce the inspection and maintenance costs of prestressed anchor cables during the operation of hydropower stations.

[0022] The use of high-early-strength premixed shrinkage-compensating cement-based materials for anchor piers results in rapid strength formation, significantly shortening the construction period for anchor pier treatment, improving the organizational efficiency of personnel and machinery on the construction site, avoiding the idleness of related human and material resources, saving human and material costs, and promoting the improvement of on-site management and scheduling. Attached Figure Description

[0023] Figure 1 This is an exploded schematic diagram of an anchor cable construction structure that uses galvanized anchor plates and grouting material to cast anchor blocks, according to this utility model.

[0024] Figure 2 This is a partial schematic diagram of an anchor cable construction structure that uses galvanized anchor plates and grouting material to cast anchor blocks, according to this utility model.

[0025] Figure 3 This is an overall schematic diagram of an anchor cable construction structure that uses galvanized anchor plates and grouting material to cast anchor blocks, according to this utility model.

[0026] In the diagram: 1. Anchor cable; 2. Anchor block; 3. Anchor plate; 4. Anchor plate assembly; 5. Casting pipe; 41. Anchor plate; 42. Extrusion sleeve; 43. Concrete protective head; 44. PVC protective sleeve. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0028] like Figures 1-3 As shown, an anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks includes an anchor cable 1, an anchor block 2, an anchor plate 3, and an anchor plate assembly 4.

[0029] In this embodiment, the end of the anchor cable 1 is locked and fixed to the anchor block 2 by the anchor plate assembly 4. An anchor pad 3 is provided between the anchor plate assembly 4 and the anchor block 2. The basic structure of the anchor plate assembly 4 is the structure of a conventional anchor plate, including an anchor plate 41 and a compression sleeve 42. After the compression sleeve wraps around the anchor cable, it is inserted into each mounting hole of the anchor plate 41. The end of the anchor cable 2 is pressed and fixed by the tensile force and the deformation of the compression sleeve 42.

[0030] The anchor plate 3 has a galvanized layer on its surface, and an epoxy waterproof paint is applied over the galvanized layer. After galvanizing, the galvanized layer reacts with air to form a ZnO and Zn(OH)2 passivation film. This film significantly reduces the impact of corrosive agents on the joint between the steel strand and the anchor plate, thus protecting the joint from large-scale rust and pitting corrosion and ensuring the effectiveness of the anchor cable. The epoxy waterproof paint coating further improves the corrosion resistance of the anchor plate.

[0031] The anchor pier 2 is an anchor pier cast from high early strength premixed shrinkage-compensating cement-based material, and the foundation material of the anchor pier is SikaGrout212.

[0032] SikaGrout212 offers advantages such as convenient construction, good fluidity, high early strength, allowable early load-bearing capacity, rapid strength gain, high final strength, two-stage shrinkage compensation, non-corrosiveness, and absence of iron and chloride ions. SikaGrout212's fluidity meets the following requirements: initial value ≥290mm, 30-minute retention value ≥260mm; compressive strength meets the following requirements: 1 day ≥45MPa, 3 days ≥70MPa, 28 days ≥90MPa. Using SikaGrout212 to cast anchor blocks will achieve high strength within 1-3 days, facilitating subsequent construction arrangements and improving on-site organizational efficiency.

[0033] To further protect the ends of the anchor cables, a concrete protective head 43 and a PVC protective sleeve 44 are provided. The concrete protective head 43 is wrapped around the anchor plate 41 to protect the anchor plate, and the PVC protective sleeve 44 is wrapped around the concrete protective head 43 to serve as an anti-corrosion layer.

[0034] In terms of structural design, the outer periphery of the anchor block 2 is a slope, the size of the slope is reduced on the side near the anchor plate 3, the size of the narrow end of the anchor block is equal to the size of the anchor plate, the thickness of the anchor block is at least 3 times the thickness of the anchor plate, and a pouring pipe 5 is provided at the anchor block to facilitate the pouring operation.

[0035] In this embodiment, the galvanized anchor plates used in the project are designed in different models according to different uses, namely 600mm×600mm×50mm, 600mm×600mm×38mm and 310mm×310mm×50mm. The model used for the through anchor cable construction in the water level change area of ​​the underground powerhouse and tailrace surge chamber is the first type, 600mm×600mm×50mm.

[0036] In the construction of prestressed anchor cables in areas with fluctuating water levels, preparing relevant personnel, machinery, and materials in advance, and setting up reasonable construction procedures will effectively reduce construction costs and reasonably shorten the construction period.

[0037] In some embodiments, to enhance the performance of the anchor block, a mixing material may be designed, such as a mix ratio of 15kg SikaGrout212, 4L of water, and 10kg of 9.5mm gravel.

[0038] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. An anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks, comprising anchor cables, anchor blocks, anchor plates, and anchor plate assemblies; characterized in that: The end of the anchor cable is locked and fixed to the anchor block by the anchor plate assembly, and an anchor pad is provided between the anchor plate assembly and the anchor block; The surface of the anchor plate is provided with a galvanized layer, and the galvanized layer is coated with an epoxy waterproof paint. The anchor is a high-early-strength premixed shrinkage-compensating cement-based material.

2. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 1, characterized in that: The anchor plate assembly includes an anchor plate, an extrusion sleeve, a concrete protective head, and a PVC protective sleeve. The anchor plate and the extrusion sleeve are used to lock the end of the anchor cable. The concrete protective head is wrapped around the anchor plate to protect the anchor plate, and the PVC protective sleeve is wrapped around the concrete protective head to serve as an anti-corrosion layer.

3. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 1, characterized in that: The outer periphery of the anchor block is a slope, and the slope is reduced in size on the side closest to the anchor plate.

4. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 1, characterized in that: The anchor plate is a prefabricated component with multiple specifications. A set of the anchor plate includes at least one of the following specifications: 600mm×600mm×50mm, 600mm×600mm×38mm, and 310mm×310mm×50mm.

5. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 1, characterized in that: The foundation material of the anchor is SikaGrout212.

6. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 1, characterized in that: A pouring pipe is installed at the anchor pier.

7. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 5, characterized in that: The flowability of the SikaGrout212 material meets the following requirements: initial value ≥290mm, 30-minute retention value ≥260mm.

8. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 5, characterized in that: The compressive strength of the SikaGrout212 material meets the following requirements: ≥45MPa after 1 day, ≥70MPa after 3 days, and ≥90MPa after 28 days.

9. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 3, characterized in that: The narrow end of the anchor block has the same dimensions as the anchor plate.

10. The anchor cable construction structure using galvanized anchor plates and grouting material to cast anchor blocks according to claim 9, characterized in that: The thickness of the anchor block is at least three times the thickness of the anchor plate.

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