Steel strand tensioning and anchoring tool and using method

Abstract

The invention relates to the technical field of steel strand tensioning, in particular to a steel strand tensioning and anchoring tool and a using method thereof.The steel strand tensioning and anchoring tool comprises a front sleeve, a rear sleeve, a steel strand tensioning and anchoring device and a steel strand tensioning and anchoring device, the front sleeve is of a hollow structure, and a first notch for operation of a working anchor is formed in the pipe wall of the front sleeve in the axial direction; the rear sleeve is of a hollow structure, and a second notch for operation of the tool anchor is formed in the pipe wall of the rear sleeve; the middle connecting flange is arranged between the front sleeve and the rear sleeve; the steel strand tensioning and anchoring tool has the beneficial effects that the steel strand tensioning and anchoring tool provides continuous supporting and operation space for a working anchor and a tool anchor. Therefore, when the steel strand is subjected to multi-time grading tensioning operation, an operator does not need to repeatedly disassemble and assemble the clamping piece of the working anchor, and only needs to insert or take out the clamping piece of the tool anchor. Abrasion and damage caused by frequent disassembly and assembly of the clamping piece in the traditional process are effectively avoided, the anchoring reliability of the clamping piece anchor (working anchor) is improved, and the service life of the clamping piece anchor (working anchor) is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of steel strand tensioning, and specifically relates to a steel strand tensioning and anchoring fixture and its usage method. Background Technology

[0002] In recent years, the scale and technology of photovoltaic power plants have been developing rapidly in the renewable energy sector. To effectively improve land utilization, especially for constructing photovoltaic power plants on existing industrial land such as agriculture and fisheries, flexible photovoltaic support systems have been widely used in "agricultural-photovoltaic complementarity" and "fishery-photovoltaic complementarity" scenarios due to their large span, fewer foundations, and minimal impact on the ground. This system primarily relies on high-strength steel strands as the main load-bearing components, suspending and supporting photovoltaic modules by tensioning a cable net structure between columns.

[0003] Throughout the entire lifecycle of a flexible photovoltaic (PV) support system, the tensioning and anchoring of the steel strands is the core element determining its structural safety and stable operation. The steel strands must be tensioned to the predetermined design tension and reliably anchored to the end columns or beams using anchors. This provides sufficient rigidity and load-bearing capacity for the entire support system to resist various loads such as wind, snow, and its own weight. The accuracy of this tensioning and the reliability of the anchoring directly affect the flatness of the PV array, the safety of the modules, and even the long-term stable operation of the entire power station.

[0004] Tensioning of steel strands is a core process, and its construction quality directly determines the load-bearing capacity and service life of the structure. As a key anchoring component in the tensioning process, wedge anchors are widely used in prestressed tensioning anchoring systems, playing an important role in fixing steel strands and maintaining prestress stability.

[0005] In the existing technology, when tensioning steel strands, in order to ensure tensioning accuracy and prestress application effect, and due to the stroke limitation of the tensioning equipment, the tensioning equipment often needs to perform multiple stages of tensioning. After each tensioning is completed, the steel strands need to be reliably anchored by wedge anchors to prevent the steel strands from shrinking back and causing prestress loss.

[0006] However, the current tensioning and anchoring process has significant drawbacks: multiple tensioning operations correspond to multiple anchoring operations. Before the next tensioning operation after each anchoring is completed, the wedges on the wedge anchor must be removed. After tensioning is in place, the wedges are reinstalled to complete the anchoring, forming a cycle of repeated disassembly and installation. The wedges of the wedge anchor are mostly precision interlocking structures, and their surface tooth profile directly affects the anchoring efficiency and stability. During repeated disassembly and installation, frequent friction and collisions occur between the wedges and the anchorage and steel strands, which can easily lead to wear of the wedge teeth and surface damage. At the same time, the disassembly and installation operations may also cause abnormal clearance between the wedges and the anchor plate, thereby reducing the anchoring reliability and actual service life of the wedge anchor.

[0007] Therefore, a steel strand tensioning and anchoring fixture and its usage method are needed to overcome the above problems. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides a steel strand tensioning and anchoring fixture, thereby achieving the objective of resolving the issues raised in the background art.

[0009] To achieve the above objectives, the present invention employs the following technical solution: a steel strand tensioning and anchoring fixture, comprising:

[0010] A front sleeve, wherein the front sleeve is a hollow structure and its tube wall is provided with a notch along the axial direction for the operation of the working anchor; The rear sleeve is a hollow structure with a notch two on its wall for tool anchor operation; and The intermediate connecting flange is located between the front sleeve and the rear sleeve; The intermediate connecting flange has a central hole for the steel strand to pass through and for supporting the tool anchor. It is also used to connect the front sleeve and the rear sleeve into one unit, forming a support and operating space around the steel strand for tensioning and anchoring operations.

[0011] As a further improvement to the above technical solution: The intermediate connecting flange is welded to one end of the front sleeve, and the intermediate connecting flange is detachably connected to the rear sleeve by screws.

[0012] The notch on the front sleeve is an open groove formed by cutting along its entire length, and the width of the open groove is smaller than the diameter of the working anchor.

[0013] The second notch on the rear sleeve includes curved cut-off sections symmetrically arranged on the pipe wall.

[0014] The rear sleeve is connected to an end connecting flange at the end furthest from the intermediate connecting flange. The end connecting flange is used in conjunction with the tensioning equipment.

[0015] This invention also provides a method for using a steel strand tensioning and anchoring fixture, comprising the following steps: S1, connect the front sleeve and the rear sleeve into one unit through the intermediate connecting flange; S2, insert the working anchor into the front sleeve, insert the tool anchor into the rear sleeve and snap it into the center hole, then let the steel strand pass through the fixture, and through the working anchor and the tool anchor, and finally set the tensioning device at the end connection flange. S3, start the tensioning equipment to perform tensioning. After each tensioning to the maximum stroke of the equipment, insert the wedge into the tool anchor through notch two to temporarily anchor the steel strand. Then, unload the tensioning equipment and perform the next tensioning until the tension of the steel strand reaches the required tension. S4. After the tension reaches the design requirements, insert the wrench into the working anchor through notch one. S5, remove the wedge from the tool anchor to slowly unload the tensioning equipment, so that the tension of the steel strand is borne by the working anchor.

[0016] As a further improvement to the above technical solution: The method of use also includes a step of replacing the working anchor clip, which includes: A1, the tooling is fitted over the outside of the steel strand, so that the front sleeve is fitted over the outside of the working anchor, and a tool anchor is set at the rear sleeve as a safety anchor. A2. Use tensioning equipment to slowly tension the anchor until the working anchor's clamps loosen, then remove the clamps. A3, Insert the new clip into the working anchor through the notch of the front sleeve; A4. Remove the wedge from the tool anchor to allow the tensioning equipment to slowly release the force, so that the tension of the steel strand is borne by the working anchor.

[0017] The beneficial effects of the embodiments of the present invention are as follows: The steel strand tensioning and anchoring fixture in this embodiment integrates a front sleeve, a rear sleeve, and an intermediate connecting flange into a single unit. Two operating notches, notch one and notch two, are provided on the pipe wall to offer continuous support and operating space for the working anchor and tool anchor. Therefore, during multiple stages of tensioning of the steel strand, operators do not need to repeatedly disassemble and reassemble the working anchor wedges; they only need to insert or remove the tool anchor wedges. This effectively avoids the wear and damage caused by frequent disassembly and reassembly of the wedges in traditional processes, improving the anchoring reliability and service life of the wedge anchor (working anchor). It also significantly enhances the efficiency and safety of tensioning operations, making it particularly suitable for scenarios with high requirements for tensioning accuracy and anchoring reliability, such as flexible photovoltaic support systems. Attached Figure Description

[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the front sleeve of the present invention; Figure 3 This is a schematic diagram of the structure of the rear sleeve of the present invention; Figure 4 This is a reference diagram showing the state when the present invention is in use.

[0019] In the diagram: 1. Front sleeve; 2. Notch 1; 3. Rear sleeve; 4. Notch 2; 5. Intermediate connecting flange; 6. Center hole; 7. Screw; 8. End connecting flange; 9. Working anchor; 10. Tool anchor. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0021] In applications such as flexible photovoltaic support systems, the tensioning and anchoring of steel strands is a critical process. Current technology, when performing multiple stages of tensioning, requires repeated disassembly and reassembly of the wedge anchors for temporary anchoring after each tensioning operation. This repeated operation easily leads to wear and damage to the wedges and may cause abnormal fit clearances, thereby reducing anchoring reliability and service life.

[0022] For this, see Figures 1 to 4 This invention discloses a steel strand tensioning and anchoring fixture, comprising: a front sleeve 1, which is a hollow structure with an axial notch 2 on its tube wall for operation of a working anchor 9; a rear sleeve 3, which is a hollow structure with an axial notch 4 on its tube wall for operation of a tool anchor 10; and an intermediate connecting flange 5, disposed between the front sleeve 1 and the rear sleeve 3; wherein the intermediate connecting flange 5 has a central hole 6 for the steel strand to pass through and for supporting the tool anchor 10, and is used to connect the front sleeve 1 and the rear sleeve 3 into one unit, forming a support and operating space for steel strand tensioning and anchoring operations on the outer periphery of the steel strand.

[0023] For ease of understanding, the following explains some key terms in this embodiment: A steel strand tensioning and anchoring fixture is a specialized piece of equipment used to assist in the tensioning and anchoring of steel strands. Its main function is to provide support, protection, and operating space for the working anchor 9 and tool anchor 10 during the tensioning process, ensuring the smooth progress of the tensioning operation.

[0024] The front sleeve 1 refers to the cylindrical component in the tooling near the steel strand and frame. Its internal space is used to accommodate the working anchor 9 and to provide support and protection for the working anchor 9.

[0025] The rear sleeve 3 refers to the cylindrical component in the tooling that is located away from the steel strand and frame. Its internal space is used to accommodate the tool anchor 10 and to provide support and protection for the tool anchor 10.

[0026] The intermediate connecting flange 5 refers to the disc-shaped or ring-shaped component that connects the front sleeve 1 and the rear sleeve 3. This flange not only serves as a structural connection but also provides a passage for the steel strands to pass through and provides support for the tool anchor 10.

[0027] Working anchor 9 refers to the anchor used to permanently anchor the steel strand to withstand the design tension force after the steel strand tensioning operation is completed.

[0028] Tool anchor 10 refers to an anchor used to temporarily anchor the steel strand during the graded tensioning process to prevent it from retracting.

[0029] Notch 2 refers to an opening made in the wall of the front sleeve 1. This opening is designed to provide a passage so that the working anchor 9 can still be operated on, such as inserting or removing the clamping piece, while it is covered by the front sleeve 1.

[0030] Notch 2, 4, refers to the opening made in the wall of the rear sleeve 3. This opening is designed to provide a passage so that the tool anchor 10 can still be operated on, such as inserting or removing the clips, while it is covered by the rear sleeve 3.

[0031] The center hole 6 refers to the through hole opened in the intermediate connecting flange 5. This hole is used for the steel strand to pass through and provides axial support for the tool anchor 10.

[0032] The tooling includes a front sleeve 1, which is constructed as a hollow cylindrical structure for fitting over the working anchor 9. An axial notch 2 is provided on the wall of the front sleeve 1. This notch 2 is designed to provide an operating channel, allowing operation of the working anchor 9 even when it is enclosed by the front sleeve 1. For example, the notch 2 can be a circular or rectangular hole, sized to allow an operator's hand or tools to be inserted or removed from the working anchor 9 for operations such as inserting or removing clamps.

[0033] The tooling also includes a rear sleeve 3, which is also constructed as a hollow cylindrical structure for fitting over the tool anchor 10. The rear sleeve 3 has a notch 4 on its wall, designed to provide an operating channel so that the tool anchor 10 can still be operated while enclosed by the rear sleeve 3. For example, the notch 4 can be a circumferentially distributed slot, its position and size designed to facilitate operation of the clamps of the tool anchor 10 during tensioning.

[0034] An intermediate connecting flange 5 is disposed between the front sleeve 1 and the rear sleeve 3. The intermediate connecting flange 5 can be connected to the front sleeve 1 and the rear sleeve 3 in various ways, such as by threaded connection, pin connection or press fit, to connect the front sleeve 1 and the rear sleeve 3 into a whole.

[0035] Furthermore, the intermediate connecting flange 5 is provided with a central hole 6. The diameter of the central hole 6 is designed to allow the steel strand to pass through smoothly, while its inner wall can provide support for the tool anchor 10. For example, the central hole 6 can be a smooth circular hole with an inner diameter slightly larger than the diameter of the steel strand, and it matches the shape of the tool anchor 10 to stabilize the position of the tool anchor 10 during tensioning. Through this integrated connection, the front sleeve 1, the rear sleeve 3, and the intermediate connecting flange 5 together form a closed or semi-closed support and operating space around the steel strand, which provides the necessary protection and convenience for the tensioning and anchoring operation of the steel strand.

[0036] The steel strand tensioning and anchoring fixture of this embodiment integrates the front sleeve 1, the rear sleeve 3, and the intermediate connecting flange 5 into a single unit. Operating notches 2 and 4 are provided on its wall, providing continuous support and operating space for the working anchor 9 and the tool anchor 10. Therefore, during multiple staged tensioning operations of the steel strand, operators do not need to repeatedly disassemble and install the clamps of the working anchor 9; they only need to insert or remove the clamps of the tool anchor 10. This effectively avoids the wear and damage caused by frequent disassembly and assembly of the clamps in traditional processes, improving the anchoring reliability and service life of the clamp anchor (working anchor 9), while significantly enhancing the efficiency and safety of tensioning operations. It is particularly suitable for scenarios with high requirements for tensioning accuracy and anchoring reliability, such as flexible photovoltaic support systems.

[0037] This application further proposes that the intermediate connecting flange 5 is welded to one end of the front sleeve 1, and the intermediate connecting flange 5 is detachably connected to the rear sleeve 3 by screws 7.

[0038] Specifically, the intermediate connecting flange 5 and the front sleeve 1 are connected by welding. This connection method provides extremely high structural strength and sealing performance, ensuring that the intermediate connecting flange 5 and the front sleeve 1 form a strong and non-removable whole. The advantage of welding is its durability and reliability, effectively resisting the huge axial and radial forces generated during the tensioning of the steel strand, ensuring the stable positioning of the front sleeve 1 in the tooling, and providing a solid foundation for the reliable operation of the working anchor 9.

[0039] Meanwhile, the intermediate connecting flange 5 and the rear sleeve 3 are detachably connected by screws 7. Screws 7 are screwed into pre-drilled through holes on both the intermediate connecting flange 5 and the rear sleeve 3, thus securing them tightly together. The characteristic of this connection method is its detachability; the components can be separated by loosening or unscrewing the screws 7 when needed, and can be easily reassembled using the screws 7. The number, diameter, length, and material selection of the screws 7 should be designed according to the load the tooling will bear and the working environment to ensure the strength and reliability of the connection.

[0040] Through the above technical solution, the intermediate connecting flange 5 and the front sleeve 1 are welded together, ensuring the robustness and overall rigidity of this connection and providing a stable support foundation for the operation of the working anchor 9. Simultaneously, the intermediate connecting flange 5 and the rear sleeve 3 are detachably connected using screws 7, allowing the rear half of the tooling to be easily separated from the front half. This combined connection method significantly improves the modularity and maintenance convenience of the tooling while ensuring the overall structural stability and reliability. When it is necessary to inspect, repair, or replace the rear sleeve 3 or the tool anchor 10, or to adjust the tooling configuration according to different tensioning equipment and construction requirements, there is no need for complete disassembly; simply loosening the screws 7 is sufficient for quick completion, greatly simplifying on-site operations, shortening maintenance time, and improving the adaptability and efficiency of the tooling.

[0041] This application further proposes that the notch 2 on the front sleeve 1 is an open groove formed by cutting along its entire length, and the width of the open groove is smaller than the diameter of the working anchor 9.

[0042] Specifically, the notch 2 on the front sleeve 1 is designed as an open groove cut along its entire length, meaning the groove is open to the outside and has sufficient axial length to typically cover the entire operating area of ​​the working anchor 9. This open and continuous design aims to provide maximum accessibility for the clamping operation of the working anchor 9, allowing operators to directly and conveniently insert, remove, or inspect the clamps from the outside without additional disassembly or adjustment. Simultaneously, the width of the open groove is precisely limited to be less than the diameter of the working anchor 9. This dimensional limitation is crucial, ensuring that although the groove is open, its opening size is insufficient to allow the entire working anchor 9 to accidentally detach from the side or undergo significant displacement. This design provides the necessary operating space while effectively constraining and supporting the working anchor 9 laterally, preventing unnecessary tilting or displacement during tensioning, thus ensuring the stability and safety of the tensioning operation.

[0043] Through the above technical solution, the notch 2 on the front sleeve 1 is designed as an open groove cut along its entire length, which greatly improves the ease of operation of the working anchor 9, allowing operators to easily and quickly insert and remove the clamps. At the same time, the width of this open groove is precisely limited to be less than the diameter of the working anchor 9, providing good lateral support and limiting for the working anchor 9, ensuring its stability and positioning accuracy during tensioning, thereby improving the efficiency and safety of the entire steel strand tensioning and anchoring operation.

[0044] This application further proposes that the notch 2 4 on the rear sleeve 3 includes symmetrically arranged curved cut-off portions on the pipe wall. The curved cut-off portions refer to the fact that the notch 2 4 on the rear sleeve 3 is not a simple straight cut or an irregular shape, but is formed by curved cut-off on the pipe wall. Here, "curved cut-off portion" means that the opening has a smooth arc or curved edge, rather than a sharp right angle or acute angle. This curved design can effectively reduce stress concentration and improve the structural strength and fatigue life of the rear sleeve 3. At the same time, "symmetrical arrangement" indicates that the curved cut-off portions are arranged symmetrically on the pipe wall of the rear sleeve 3, for example, there may be two or more cut-off portions symmetrically distributed about an axis. This symmetry helps maintain the overall balance and stability of the rear sleeve 3, while providing convenience for operators to operate the tool anchor 10 from different directions or angles.

[0045] This application further proposes that an end connecting flange 8 is connected to the end of the rear sleeve 3 furthest from the intermediate connecting flange 5. The end connecting flange 8 is used in conjunction with the tensioning equipment. Specifically, the end connecting flange 8 is a disc-shaped or ring-shaped structure located at the end of the rear sleeve 3. Its connection method can be varied; for example, it can be fixed to the rear sleeve 3 by welding, screw connection, pin connection, or flange bolt connection. The size and shape of this flange should match the end of the rear sleeve 3 and provide sufficient strength and rigidity to withstand the force applied by the tensioning equipment. Its main function is to provide a standardized and robust connection interface for the tensioning equipment. As the interface between the tensioning equipment and the tooling, the design of the end connecting flange 8 should consider compatibility with various standard or specific tensioning equipment.

[0046] This application proposes a method for using a steel strand tensioning and anchoring fixture, the method comprising the following steps: First, the tooling is assembled. The front sleeve 1 and the rear sleeve 3 are connected as a single unit via the intermediate connecting flange 5. This step aims to assemble the main components of the steel strand tensioning and anchoring tooling into a complete, hollow cylindrical structure. The front sleeve 1, the intermediate connecting flange 5, and the rear sleeve 3 are tightly connected using a pre-defined connection method (e.g., the intermediate connecting flange 5 is welded to one end of the front sleeve 1 and detachably connected to the rear sleeve 3 via screws 7), ensuring that the tooling can withstand prestress and provide stable support during tensioning. This assembly process lays the foundation for subsequent steel strand threading, anchor installation, and tensioning operations, ensuring the integrity and stability of the tooling.

[0047] Next, the anchorage and steel strand are installed, and the tensioning equipment is connected. The working anchor 9 is inserted into the front sleeve 1, and the tool anchor 10 is inserted into the rear sleeve 3 and engaged in the center hole 6. The steel strand is then passed through the fixture, the working anchor 9, and the tool anchor 10. Finally, the tensioning equipment is positioned at the end connecting flange 8. This step details the preparations before the tensioning operation. First, the working anchor 9, used for permanent anchoring of the steel strand, is placed inside the front sleeve 1 in its anchoring position. Next, the tool anchor 10, used for temporary anchoring during tensioning, is inserted into the rear sleeve 3, aligned with and engaged in the center hole 6 of the intermediate connecting flange 5. Then, the steel strand to be tensioned is passed sequentially through the fixture, the working anchor 9, and the tool anchor 10, ensuring smooth tensioning. Finally, the tensioning equipment (such as a jack) is connected to the end connecting flange 8 of the fixture, preparing for the subsequent tensioning operation. The design of the end connection flange 8 ensures that the tensioning equipment can be stably and reliably connected to the tooling and transmit the tension force.

[0048] Next, the steel strands are tensioned and temporarily anchored. The tensioning equipment is started for tensioning. After each tensioning to the maximum stroke of the equipment, wedges are inserted into the tool anchor 10 through notch 24 to temporarily anchor the steel strand. Then, the tensioning equipment is unloaded and the next tensioning cycle begins until the required tension force on the steel strand is achieved. This step illustrates the core process of graded tensioning of the steel strands. After the tensioning equipment is started, the steel strands begin to be tensioned. When the tensioning equipment reaches its maximum stroke, in order to achieve graded tensioning and maintain the applied tension force, the operator inserts wedges into the tool anchor 10 through notch 24 on the rear sleeve 3. Under the action of the tension force, the wedges of the tool anchor 10 wed the steel strand, thus achieving temporary anchoring. After temporary anchoring, the tensioning equipment can be unloaded and reset, preparing for the next tensioning cycle. This process is repeated until the accumulated tension force on the steel strand reaches the design requirements. The design of notch 24 allows for convenient operation of the clamping plates of tool anchor 10 without disassembling the tooling during the tensioning process, thus improving operational efficiency.

[0049] Subsequently, the permanent anchoring of the steel strand is performed. After the tension reaches the design requirement, the wedge is inserted into the working anchor 9 through notch 2. This step describes the permanent anchoring operation after the steel strand reaches the design tension. Once the tension of the steel strand accumulates to the preset design requirement through the above steps, the operator inserts the wedge into the working anchor 9 through notch 2 on the front sleeve 1. Under the action of tension, the wedge of the working anchor 9 weaves the steel strand tightly, thereby permanently anchoring the steel strand to the structure. The notch 2 allows for convenient wedge installation of the working anchor 9 without disassembling the tooling, ensuring the smooth progress of permanent anchoring.

[0050] Finally, the tension force is transferred. The wedges in tool anchor 10 are removed, allowing the tensioning equipment to slowly unload, so that the tension force of the steel strand is borne by working anchor 9. This step is the final stage of the tensioning operation, namely the process of transferring the tension force from temporary anchoring to permanent anchoring. After the wedges of working anchor 9 have firmly anchored the steel strand, the operator removes the temporary wedges from tool anchor 10. Subsequently, the tensioning equipment is slowly unloaded, at which point all the tension force on the steel strand will be gradually and smoothly transferred and borne by working anchor 9 with the wedges already installed. This process ensures a smooth transition of tension force, avoiding potential impact on the steel strand or structure due to sudden unloading, thereby ensuring the reliability of the anchoring and the safety of the structure.

[0051] This application provides a clear, efficient, and safe process for tensioning and anchoring prestressed steel strands using the above method. This method utilizes a specific structure of the tooling to achieve graded tensioning and temporary anchoring of the steel strands without disassembling the tooling. The clamps of the tool anchor 10 can be easily operated via notch 24, effectively solving the problem of inconvenient temporary anchoring during graded tensioning. Simultaneously, after the required tension is reached, the clamps are inserted into the working anchor 9 via notch 12 for permanent anchoring, ultimately smoothly transferring the tension force from the tool anchor 10 to the working anchor 9, ensuring accurate transmission of tension force and reliable anchoring. This significantly improves the efficiency and safety of tensioning operations, reduces construction difficulty, and guarantees the tensioning quality of the prestressed steel strands.

[0052] In steel strand tensioning and anchoring operations, the wedges of the working anchor 9 may need to be replaced due to long-term stress, wear, or accidental damage. However, replacing the wedges while the steel strand is already under tension often requires completely unloading the tension of the steel strand using traditional methods. This is not only time-consuming but also poses safety hazards and affects construction efficiency. Existing tensioning and anchoring methods mainly focus on the initial tensioning process, lacking a safe and efficient solution for replacing the wedges of the working anchor 9 after the steel strand has been anchored.

[0053] In this regard, this application further proposes a method for using a steel strand tensioning and anchoring fixture, which also includes a step of replacing the working anchor 9 clamp, specifically including: First, the fixture is fitted over the steel strand, so that the front sleeve 1 is fitted over the working anchor 9, and the tool anchor 10 is set at the rear sleeve 3 as a safety anchor. This step aims to provide a safe operating environment and temporary anchoring guarantee for the replacement of the working anchor 9's wedges. The entire steel strand tensioning and anchoring fixture is fitted over the steel strand, ensuring that the front sleeve 1 can completely cover the working anchor 9, thus utilizing the notch 2 on the front sleeve 1 to provide a convenient passage for subsequent wedge operations. At the same time, the tool anchor 10 is set at the rear sleeve 3 and placed in a state where it can bear force at any time, serving as a safety barrier, i.e., a safety anchor. The tool anchor 10 does not bear the main tension force at this stage, but its presence ensures that in the event of an accident during the replacement of the working anchor 9's wedges, the tension of the steel strand can be taken over by the tool anchor 10 in time, preventing the steel strand from retracting uncontrollably, thereby ensuring the safety of the operators and the stability of the structure.

[0054] Secondly, the tensioning equipment is used to slowly tension the strand until the clamps of working anchor 9 loosen, at which point the clamps are removed. This step applies a slow and controlled tension force to the steel strand using the tensioning equipment, the purpose of which is to temporarily relieve the tension on the clamps of working anchor 9. As the force applied by the tensioning equipment gradually increases and exceeds the frictional force maintained by the clamps of working anchor 9, the clamps of working anchor 9 will loosen. At this point, the operator can safely remove the old clamps from working anchor 9 without completely unloading the tension of the steel strand. This method avoids the complex operation and potential risks associated with the complete release of tension in the steel strand, improving replacement efficiency.

[0055] Subsequently, the new clamping piece is inserted into the working anchor 9 through the notch 2 of the front sleeve 1. After the old clamping piece is removed, the new clamping piece needs to be installed into the working anchor 9. The notch 2 provided on the front sleeve 1, with its design (e.g., an open groove cut along the entire length of the pipe wall), provides a direct and spacious channel for the insertion of the clamping piece. The operator can use this notch 2 to accurately and conveniently insert the new clamping piece into the tapered hole of the working anchor 9, ensuring the correct fit between the clamping piece and the steel strand and the tapered hole of the anchor, preparing for subsequent load-bearing.

[0056] Finally, the wedges in tool anchor 10 are removed, allowing the tensioning equipment to slowly release the force, so that the tension force of the steel strand is borne by working anchor 9. After the new wedges are successfully installed in working anchor 9 and their correct position is confirmed, tool anchor 10, acting as a safety anchor, completes its temporary protection task. At this point, the wedges in tool anchor 10 are first removed, so that it no longer applies anchoring force to the steel strand. Subsequently, the tensioning equipment begins to slowly release the applied tension force. As the tension force gradually decreases, the tension force on the steel strand is smoothly transferred to the newly installed wedges in working anchor 9 until working anchor 9 fully bears the tension force of the steel strand. This slow unloading process ensures the smoothness of load transfer, avoids damage to the anchor and steel strand caused by impact loads, and verifies the reliability of the new wedges.

[0057] Through the aforementioned wedge replacement steps, this application provides a method for safely and efficiently replacing the working anchor 9 wedges while the steel strand is under tension. This method utilizes the tool anchor 10 as a safety anchor, providing temporary safety during the replacement process and effectively avoiding the risk of uncontrolled tension in the steel strand. Simultaneously, the controlled, slow tensioning and unloading of the steel strand using tensioning equipment enables the loosening and installation of the working anchor 9 wedges under load, greatly simplifying the operation process and avoiding the complexity and time costs associated with completely unloading the steel strand tension in traditional methods. The notch 2 of the front sleeve 1 provides a convenient channel for the removal and insertion of the wedges. Overall, this method significantly improves the safety, convenience, and efficiency of the steel strand tensioning and anchoring fixture during maintenance operations, ensuring the continuous stability of the engineering structure and the continuity of construction.

[0058] The following specific example further illustrates the above technical solution: First, the construction workers assemble the steel strand tensioning and anchoring fixture. This fixture includes a front sleeve 1, a rear sleeve 3, and an intermediate connecting flange 5. Both the front sleeve 1 and the rear sleeve 3 are hollow structures, and the intermediate connecting flange 5 is positioned between them. Specifically, one end of the intermediate connecting flange 5 is fixedly connected to one end of the front sleeve 1 by welding, while the other end is detachably connected to the rear sleeve 3 by screws 7. This connection method allows for easy disassembly and maintenance of the fixture when needed. The intermediate connecting flange 5 has a central hole 6, which not only allows the steel strand to pass through but also provides support for the subsequently inserted tool anchor 10. The front sleeve 1 has an axially oriented notch 2, which is an open groove cut along the entire length of the tube wall. Its width is smaller than the diameter of the working anchor 9, and it is used to operate the working anchor 9 during tensioning. The rear sleeve 3 has symmetrically arranged curved cut-off notches 4 on its tube wall for operating the tool anchor 10. Furthermore, an end connecting flange 8 is connected to the end of the rear sleeve 3 furthest from the intermediate connecting flange 5; this end connecting flange 8 is used to cooperate with the tensioning equipment. Through the above assembly, the front sleeve 1, rear sleeve 3, and intermediate connecting flange 5 are connected as a whole, forming a support and operating space around the steel strand for tensioning and anchoring operations.

[0059] Next, the construction workers will carry out the tensioning operation according to the following steps: First, insert the working anchor 9 into the front sleeve 1 and the tool anchor 10 into the rear sleeve 3, securing it into the center hole 6 of the intermediate connecting flange 5. Then, pass the steel strand to be tensioned through the entire fixture, sequentially through the working anchor 9 and the tool anchor 10. Finally, place the tensioning device at the end connecting flange 8, ensuring a reliable connection between the tensioning device and the fixture.

[0060] The second step is to start the tensioning equipment for tensioning. Once the tensioning equipment reaches its maximum stroke, the construction personnel do not need to disassemble the tool anchor 10. Instead, they directly insert the wedges into the tool anchor 10 through the notch 2 4 on the rear sleeve 3 to temporarily anchor the steel strand. After temporary anchoring, the tensioning equipment releases pressure and returns to its original position, ready for the next tensioning operation. This process avoids the tedious operation of repeatedly disassembling the working anchor 9 wedges in traditional methods, significantly reducing friction and collision between the wedges and the working anchor 9, thereby effectively protecting the teeth and surface of the wedges and extending their service life.

[0061] The third step is to repeat the tensioning and temporary anchoring steps described above until the tension of the steel strands reaches the design requirements.

[0062] Fourthly, after the tension of the steel strand reaches the design requirements, the construction personnel insert the clamp into the working anchor 9 through the notch 2 on the front sleeve 1 to complete the permanent anchoring of the steel strand. The open groove design of the notch 2 makes the installation of the clamp convenient and efficient.

[0063] Fifth, after permanent anchoring is completed, the construction workers remove the wedges from the tool anchor 10 and then slowly unload the tensioning equipment. At this point, the tension of the steel strand will be borne by the working anchor 9, completing the entire tensioning and anchoring operation.

[0064] Furthermore, this fixture provides a convenient method for replacing the wedges of the working anchor 9. Workers can place the fixture over the outside of the steel strand, with the front sleeve 1 fitted over the working anchor 9, and a tool anchor 10 placed at the rear sleeve 3 as a safety anchor. Then, the tensioning equipment is used to slowly tension the strand until the wedges of the working anchor 9 loosen and are removed. Through the notch 2 of the front sleeve 1, workers can directly insert the new wedges into the working anchor 9. Finally, the wedges in the tool anchor 10 are removed, allowing the tensioning equipment to slowly release the tension, so that the tension force of the steel strand is borne by the working anchor 9. The entire wedge replacement process does not require disassembly of the fixture or the working anchor 9, greatly improving maintenance efficiency and further reducing potential damage to the wedges during disassembly and assembly.

[0065] This steel strand tensioning and anchoring fixture and its usage method, through the operation notches (notch 2 and notch 4) on the front sleeve 1 and the rear sleeve 3, and the supporting role of the intermediate connecting flange 5, eliminates the need for repeated disassembly and installation of the working anchor 9's wedges during multiple staged tensioning processes. Compared with existing technologies, this solution effectively avoids problems such as wear, damage, and abnormal fit clearances caused by frequent disassembly and assembly of the wedges, significantly improving the anchoring reliability and service life of the wedge anchor, while simplifying construction operations and improving work efficiency. All components work together to construct an efficient and reliable steel strand tensioning and anchoring solution.

[0066] The terms “first” and “second” are used to distinguish similar objects, rather than to describe or indicate a specific order or sequence.

[0067] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0068] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A steel strand tensioning and anchoring fixture, characterized in that, include: The front sleeve (1) is a hollow structure, and its tube wall is provided with a notch (2) along the axial direction for the operation of the working anchor (9). The rear sleeve (3) is a hollow structure with a notch (4) on its wall for the tool anchor (10) to operate; and The intermediate connecting flange (5) is located between the front sleeve (1) and the rear sleeve (3); The intermediate connecting flange (5) is provided with a central hole (6) for the steel strand to pass through and for supporting the tool anchor (10), and is used to connect the front sleeve (1) and the rear sleeve (3) into one unit, forming a support and operating space for the tensioning and anchoring operation of the steel strand on the outer periphery of the steel strand.

2. The steel strand tensioning and anchoring fixture according to claim 1, characterized in that, The intermediate connecting flange (5) is welded to one end of the front sleeve (1), and the intermediate connecting flange (5) is detachably connected to the rear sleeve (3) by screws (7).

3. The steel strand tensioning and anchoring fixture according to claim 1, characterized in that, The notch 1 (2) on the front sleeve (1) is an open groove formed by cutting along its entire length. The width of the open groove is smaller than the diameter of the working anchor (9).

4. The steel strand tensioning and anchoring fixture according to claim 1, characterized in that, The notch 2 (4) on the rear sleeve (3) includes curved cut-off sections symmetrically arranged on the pipe wall.

5. The steel strand tensioning and anchoring fixture according to claim 1, characterized in that, The rear sleeve (3) is connected to an end connecting flange (8) at the end away from the intermediate connecting flange (5), and the end connecting flange (8) is used in conjunction with the tensioning equipment.

6. A method of using the steel strand tensioning and anchoring fixture as described in any one of claims 1-5, characterized in that, Includes the following steps: S1, connect the front sleeve (1) and the rear sleeve (3) into one unit through the intermediate connecting flange (5); S2, insert the working anchor (9) into the front sleeve (1), insert the tool anchor (10) into the rear sleeve (3) and insert it into the center hole (6), then let the steel strand pass through the tooling and through the working anchor (9) and the tool anchor (10), and finally set the tensioning device at the end connecting flange (8); S3, start the tensioning equipment to tension. After each tensioning to the maximum stroke of the equipment, insert the wedge into the tool anchor (10) through the notch 2 (4) to temporarily anchor the steel strand. Then, unload the tensioning equipment and perform the next tensioning until the tension of the steel strand reaches the required level. S4, after the tension reaches the design requirements, insert the wedge into the working anchor (9) through notch one (2); S5, remove the wedge from the tool anchor (10) to allow the tensioning equipment to slowly release the force, so that the tension of the steel strand is borne by the working anchor (9).

7. The method of using the steel strand tensioning and anchoring fixture according to claim 6, characterized in that, The method of use also includes a step of replacing the working anchor (9) clip, which includes: A1, the tooling is fitted outside the steel strand so that the front sleeve (1) is fitted outside the working anchor (9) and the tool anchor (10) is set at the rear sleeve (3) as a safety anchor. A2, use tensioning equipment to slowly tension until the clips of the working anchor (9) loosen, then remove the clips; A3, insert the new clip into the working anchor (9) through the notch (2) of the front sleeve (1); A4, remove the clips from the tool anchor (10) to allow the tensioning equipment to slowly release the force, so that the tension of the steel strand is borne by the working anchor (9).

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