Method and device for detecting free segment length of prestressed anchor cable and related equipment

Abstract

The application discloses a prestressed anchor cable free section length detection method and device and related equipment. The method comprises the following steps: a counterforce frame is installed on the anchor pier of the anchor cable, and the counterforce frame is used to apply counter-tension to the steel strand in the anchor cable, wherein the supporting surface of the counterforce frame is perpendicular to the axis of the anchor cable; when the anchor plate in the anchor cable is separated from the anchor plate in the anchor cable, the load value in the elastic stage and the elongation of the steel strand corresponding to the load value are recorded; and the free section length of the anchor cable is determined according to the recorded multiple sets of load values and the elongation of the steel strand corresponding to the multiple sets of load values. Thus, the free section length of the prestressed anchor cable is automatically detected, manual estimation is not required, and the accuracy of determining the free section length of the anchor cable is improved.

Description

Technical Field

[0001] This invention relates to the field of prestressed structure testing technology, and in particular to a method, apparatus and related equipment for testing the free length of prestressed anchor cables. Background Technology

[0002] Prestressed anchor cables are an important support method for improving the stability of engineering structures such as slopes, foundation pits, and tunnels by applying prestress to steel strands and transferring tension to stable soil and rock layers. Anchor cable structures typically consist of three parts: the anchorage section, the free section, and the tensioning section. The free section refers to the section between the anchorage section and the tensioning end that can freely expand and contract; its length directly affects the anchor cable's load-bearing capacity and long-term stability.

[0003] During anchor cable construction, the actual free length of the anchor cable often differs from the design value due to factors such as borehole deviation, changes in geological conditions, uneven distribution of grout, and deviations between the actual position of the anchoring section and the design. Accurately measuring the actual free length of the anchor cable is of great significance for assessing the working condition of the anchor cable, determining the degree of prestress loss, guiding supplementary tensioning operations, and verifying the rationality of the structural design.

[0004] In existing technologies, the detection of the free section length of anchor cables is mainly based on the experience estimation of construction personnel, which results in a low accuracy rate in determining the free section length. Summary of the Invention

[0005] This invention provides a method, apparatus, and related equipment for detecting the free length of a prestressed anchor cable, which automatically detects the free length of the prestressed anchor cable without requiring manual estimation, thus improving the accuracy of determining the free length of the anchor cable.

[0006] According to a first aspect of the present invention, a method for detecting the free length of a prestressed anchor cable is provided, the method comprising: A graded load loading method is adopted, and a reaction frame installed on the anchor pier in the anchor cable applies a counter-tension to the steel strands in the anchor cable respectively, wherein the support surface of the reaction frame is perpendicular to the axis of the anchor cable; When the wedge in the anchor cable disengages from the anchor plate in the anchor cable, the load value during the elastic phase and the elongation of the steel strand corresponding to the load value are recorded. The length of the free section of the anchor cable is determined based on the recorded load values ​​and the elongation of the steel strand corresponding to the load values.

[0007] According to another aspect of the present invention, a device for detecting the free length of a prestressed anchor cable is provided, the device comprising: A graded loading module is used to apply counter-tension to the steel strands in the anchor cable by means of a reaction frame installed on the anchor pier in the anchor cable, wherein the support surface of the reaction frame is perpendicular to the axis of the anchor cable. The recording module is used to start recording the load value during the elastic phase and the elongation of the steel strand corresponding to the load value when the wedge in the anchor cable disengages from the anchor plate in the anchor cable. The free segment length determination module is used to determine the free segment length of the anchor cable based on multiple sets of recorded load values ​​and the elongation of the steel strands corresponding to the multiple sets of load values.

[0008] According to another aspect of the present invention, an electronic device is provided, the electronic device including at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the free segment length detection method of the prestressed anchor cable described in the first aspect.

[0009] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions, the computer instructions being configured to cause a processor to execute and implement the method for detecting the free segment length of a prestressed anchor cable according to any embodiment of the present invention.

[0010] According to another aspect of the present invention, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps of the method for detecting the free segment length of a prestressed anchor cable as described in any embodiment of the present invention.

[0011] The technical solution of this invention employs a graded load loading method, applying counter-tension to the steel strands in the anchor cable through a reaction frame installed on the anchor pier. When the wedge in the anchor cable detaches from the anchor plate, the load value during the elastic phase and the corresponding elongation of the steel strand are recorded. Then, based on the recorded multiple sets of load values ​​and the corresponding elongations of the steel strand, the free section length of the anchor cable is determined. Therefore, this invention utilizes the elastic stress characteristic of the free section of the steel strand after the wedge detaches from the anchor plate, accurately measuring the load change and elongation to calculate the free section length, eliminating the need for manual estimation based on experience and improving the accuracy of the determined free section length of the anchor cable.

[0012] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a flowchart illustrating the method for detecting the free section length of a prestressed anchor cable according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the connection between the reaction frame and the steel strand according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the connector position provided according to an embodiment of the present invention; Figure 4 This is a flowchart illustrating the process of determining the free segment length of an anchor cable according to an embodiment of the present invention; Figure 5 This is a flowchart illustrating the method for detecting the free section length of a prestressed anchor cable according to an embodiment of the present invention. Figure 6 This is a schematic diagram of a device for detecting the free section length of a prestressed anchor cable according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0016] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0017] Currently, the detection of the free section length of anchor cables is mainly based on the experience of construction personnel, which leads to a low accuracy rate in determining the free section length.

[0018] In view of this, this application provides a method for detecting the free length of a prestressed anchor cable. By employing a graded load application method, a reaction frame installed on the anchor pier in the anchor cable applies counter-tension to the steel strands in the anchor cable. When the wedge in the anchor cable detaches from the anchor plate, the load value during the elastic phase and the corresponding elongation of the steel strand are recorded. Then, based on the recorded multiple sets of load values ​​and the corresponding elongations of the steel strand, the free length of the anchor cable is determined. Thus, this embodiment of the invention utilizes the elastic stress characteristic of the free section of the steel strand after the wedge detaches from the anchor plate, and calculates the free length by accurately measuring the load change and elongation, eliminating the need for manual estimation based on experience, thereby improving the accuracy of the determined free length of the anchor cable.

[0019] The following is a detailed description of the method for detecting the free segment length of prestressed anchor cables in the embodiments of this application. Figure 1 This is a flowchart illustrating a method for detecting the free segment length of a prestressed anchor cable according to an embodiment of the present invention. Figure 1 As can be seen from this, it may specifically include the following steps: S110: A graded load loading method is adopted, and a reaction frame installed on the anchor pier in the anchor cable applies a counter-tension to the steel strands in the anchor cable respectively, wherein the support surface of the reaction frame is perpendicular to the axis of the anchor cable; For example, such as Figure 2 The diagram shown is a schematic of the connection between the reaction frame and the steel strand. Figure 2As can be seen, the reaction frame 203 is installed in the anchor pier 205, and its supporting surface is perpendicular to the anchor cable axis. It is used to provide tension reaction force. During installation, it should be ensured that the supporting surface of the reaction frame 203 is perpendicular to the anchor cable axis to ensure that the direction of the tension force is consistent with the anchor cable axis and to avoid eccentric force. Furthermore, for cases where the cut length of the steel strand 201 is too short to directly install the tensioning equipment, the present invention uses a connector 202 to lengthen the steel strand 201, allowing the lengthened steel strand 201 to pass through the corresponding tensioning hole 204 of the reaction frame 203, forming a tensionable structure. Specifically, as shown... Figure 3 As shown, connector 202 is located between steel strand 201 and anchor 205.

[0020] In this embodiment, before performing S110, it is necessary to break the sealing concrete of the anchor head of the anchor cable, clean the anchorage and exposed steel strands, so that the steel strands to be tested in the anchor cable are fully exposed. During cleaning, avoid violent impacts or shearing of the steel strands to prevent damage. At the same time, thoroughly clean the cement slurry, rust, and oil stains from the working anchorage, wedges, and exposed steel strands to ensure that all components can move freely.

[0021] Furthermore, a load sensor is installed between the reaction frame and the tensioning equipment to monitor the tensioning load in real time. A displacement sensor is installed on the anchor or tensioning equipment to monitor the elongation of the steel strand in real time. The displacement sensor should be installed on an independent reference frame, with the probe vertically aligned with a flat point on the anchor or jack base to avoid the influence of reaction frame deformation on measurement accuracy. This invention connects the load sensor and displacement sensor to a data acquisition system. In this embodiment, the displacement sensor is installed on an independent reference frame, with the probe vertically aligned with a flat point on the anchor or jack base to avoid the influence of reaction frame deformation on measurement accuracy. This achieves synchronous acquisition and automatic recording of load and displacement data.

[0022] S120: When the wedge in the anchor cable disengages from the anchor plate in the anchor cable, start recording the load value during the elastic phase and the elongation of the steel strand corresponding to the load value; In this embodiment, the relative relationship between the steel strand and the anchor plate is closely observed during the loading process to accurately determine the timing of the wedge detaching from the anchor plate. The criterion for determining whether the wedge has detached from the anchor plate is: during the loading process, when the load increases slightly while the displacement increases significantly, it indicates that the wedge has detached from the anchor plate.

[0023] In this embodiment, after each load level is applied, the load is stabilized for a period of time. Once the load and displacement readings are stable, the load value and the corresponding elongation of the steel strand are recorded.

[0024] S130: Determine the free section length of the anchor cable based on the recorded multiple sets of load values ​​and the elongation of the steel strand corresponding to the multiple sets of load values.

[0025] The method for determining the free segment length of the anchor cable in the embodiments of this application will be described below. Figure 4 A flowchart illustrating the process for determining the free length of an anchor cable may include the following steps: S410: For any set of load values, based on the load values ​​and the previous set of load values, obtain the load value change corresponding to the load values; In one possible implementation, S410 can be specifically implemented as: subtracting the load value from the previous set of load values ​​to obtain the load value change corresponding to the load value.

[0026] Furthermore, if the load value does not exist in the previous set of load values, then the load value is determined as the load value change.

[0027] S420: Based on the change in load value and the elongation of the steel strand corresponding to the load value, the intermediate length corresponding to the load value is obtained; In one possible implementation, S420 can be specifically implemented as follows: dividing the elongation of the steel strand by the change in load value to obtain a first intermediate value; multiplying the first intermediate value, the elastic modulus of the steel strand, and the cross-sectional area of ​​the steel strand to obtain the intermediate length corresponding to the load value. The intermediate length corresponding to the load value can be determined using formula (1): ...(1); in, The intermediate length, The change in the load value, This refers to the elongation of the steel strand. The elastic modulus of the steel strand. Let be the cross-sectional area of ​​the steel strand.

[0028] S430: The free section length of the anchor cable is obtained based on the intermediate lengths corresponding to the multiple sets of load values.

[0029] In one possible implementation, S430 can be specifically implemented as: determining the average value of the intermediate lengths corresponding to the multiple sets of loads as the free end length of the anchor cable.

[0030] Therefore, in this embodiment, after the prestressed anchor cable is tensioned, the steel strand is anchored to the anchor plate by clamps. When the anchor cable is counter-tensioned, as the tension force gradually increases, the gripping force between the clamps and the anchor plate gradually decreases until the clamps detach from the anchor plate. Before the clamps detach from the anchor plate, the elongation of the steel strand is affected by the friction between the clamps and the anchor plate, and the relationship between the load and the elongation is nonlinear. After the clamps detach from the anchor plate, the free section of the steel strand is in a state of free expansion and contraction, and its stress behavior conforms to the law of elastic deformation, that is, the elongation is linearly related to the change in load and obeys Hooke's law. Therefore, based on this principle, during the counter-tensioning process, after the clamps detach from the anchor plate, the change in load and the elongation of the steel strand in the elastic stage are recorded, and the length of the free section is determined by the change in load and the elongation of the steel strand, ensuring the accuracy of determining the length of the free section.

[0031] Furthermore, the embodiments in this application do not cause structural damage. During the testing process, only tension within the elastic range is applied to the anchor cable, which will not cause destructive damage to the anchor cable structure. After the testing is completed, the sealing concrete is restored, without affecting the long-term performance of the anchor cable.

[0032] In one possible implementation, after the inspection is completed, the reaction frame and monitoring equipment are disassembled, the anchor head is treated with rust prevention, and the sealing concrete is re-poured to restore permanent protection.

[0033] To further understand the method for detecting the free segment length of a prestressed anchor cable as described in this application, Figure 5 This is a flowchart illustrating a method for detecting the free length of a prestressed anchor cable, which may include the following steps: S510: A graded load loading method is adopted, and a reaction frame installed on the anchor pier in the anchor cable applies a counter-tension to the steel strands in the anchor cable respectively, wherein the support surface of the reaction frame is perpendicular to the axis of the anchor cable; S520: When the wedge in the anchor cable disengages from the anchor plate in the anchor cable, start recording the load value during the elastic phase and the elongation of the steel strand corresponding to the load value; S530: For any set of recorded load values, based on the load values ​​and the previous set of load values, obtain the load value change corresponding to the load value; S540: Divide the elongation of the steel strand by the change in load value to obtain a first intermediate value; S550: Multiply the first intermediate value, the elastic modulus of the steel strand, and the cross-sectional area of ​​the steel strand to obtain the intermediate length corresponding to the load value; S560: The average value of the intermediate lengths corresponding to multiple loads is determined as the free end length of the anchor cable.

[0034] Based on the same inventive concept, this application also provides a device for detecting the free section length of a prestressed anchor cable. Figure 6 This is a schematic diagram of the device for detecting the free section length of the prestressed anchor cable. Figure 6 As shown, the device 600 includes: The graded loading module 610 is used to apply counter-tension to the steel strands in the anchor cable by means of a reaction frame installed on the anchor pier in the anchor cable using a graded load loading method, wherein the support surface of the reaction frame is perpendicular to the axis of the anchor cable. The recording module 620 is used to start recording the load value during the elastic phase and the elongation of the steel strand corresponding to the load value when the wedge in the anchor cable disengages from the anchor plate in the anchor cable. The free segment length determination module 630 is used to determine the free segment length of the anchor cable based on multiple sets of recorded load values ​​and the elongation of the steel strands corresponding to the multiple sets of load values.

[0035] In one possible embodiment, the free segment length determination module 630 is specifically used for: For any set of load values, based on the load values ​​and the previous set of load values, the change in load value corresponding to the load value is obtained; Based on the change in load value and the elongation of the steel strand corresponding to the load value, the intermediate length corresponding to the load value is obtained; The free segment length of the anchor cable is obtained based on the intermediate lengths corresponding to the multiple sets of load values.

[0036] In one possible embodiment, the free segment length determination module 630 is further configured to: Divide the elongation of the steel strand by the change in load value to obtain the first intermediate value; Multiply the first intermediate value, the elastic modulus of the steel strand, and the cross-sectional area of ​​the steel strand to obtain the intermediate length corresponding to the load value.

[0037] In one possible embodiment, the free segment length determination module 630 is further configured to: The intermediate length corresponding to the load is determined by the following formula: ; in, The intermediate length, The change in the load value, This refers to the elongation of the steel strand. The elastic modulus of the steel strand. Let be the cross-sectional area of ​​the steel strand.

[0038] In one possible embodiment, the free segment length determination module 630 is further configured to: The average value of the intermediate lengths corresponding to the multiple loads is determined as the free end length of the anchor cable.

[0039] The free length detection device for prestressed anchor cables provided in this embodiment of the invention can execute the free length detection method for prestressed anchor cables provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0040] The collection, storage, use, processing, transmission, provision, and disclosure of user personal information involved in the technical solution disclosed herein comply with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0041] The information collected is information and data authorized by the user or fully authorized by all parties. The collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data all comply with the relevant laws, regulations and standards of the relevant countries and regions, necessary confidentiality measures have been taken, and they do not violate public order and good morals. Corresponding operation portals are provided for users to choose to authorize or refuse.

[0042] Provide users with corresponding operation entry points, allowing them to choose to agree to or reject the automated decision results; if the user chooses to reject, the process will proceed to the expert decision-making process.

[0043] Figure 7 A schematic diagram of an electronic device 10, which can be used to implement embodiments of the present invention, is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0044] like Figure 7As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0045] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0046] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the method for detecting the free segment length of a prestressed anchor cable.

[0047] In some embodiments, the method for detecting the free length of a prestressed anchor cable can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as a storage unit. In some embodiments, part or all of the computer program can be loaded and / or installed on an electronic device via a ROM and / or communication unit. When the computer program is loaded into RAM and executed by a processor, one or more steps of the method for detecting the free length of a prestressed anchor cable can be performed. Alternatively, in other embodiments, the processor can be configured to perform the method for detecting the free length of a prestressed anchor cable by any other suitable means (e.g., by means of firmware).

[0048] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0049] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0050] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0051] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0052] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0053] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0054] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0055] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting the free section length of a prestressed anchor cable, characterized in that, The method includes: A graded load loading method is adopted, and a reaction frame installed on the anchor pier in the anchor cable applies a counter-tension to the steel strands in the anchor cable respectively, wherein the support surface of the reaction frame is perpendicular to the axis of the anchor cable; When the wedge in the anchor cable disengages from the anchor plate in the anchor cable, the load value during the elastic phase and the elongation of the steel strand corresponding to the load value are recorded. The length of the free section of the anchor cable is determined based on the recorded load values ​​and the elongation of the steel strand corresponding to the load values.

2. The method according to claim 1, characterized in that, Determining the free section length of the anchor cable based on multiple recorded load values ​​and the elongation of the steel strand corresponding to those load values ​​includes: For any set of load values, based on the load values ​​and the previous set of load values, the change in load value corresponding to the load value is obtained; Based on the change in load value and the elongation of the steel strand corresponding to the load value, the intermediate length corresponding to the load value is obtained; The free segment length of the anchor cable is obtained based on the intermediate lengths corresponding to the multiple sets of load values.

3. The method according to claim 2, characterized in that, The process of obtaining the intermediate length corresponding to the load value based on the change in load value and the elongation of the steel strand corresponding to the load value includes: Divide the elongation of the steel strand by the change in load value to obtain the first intermediate value; Multiply the first intermediate value, the elastic modulus of the steel strand, and the cross-sectional area of ​​the steel strand to obtain the intermediate length corresponding to the load value.

4. The method according to claim 3, characterized in that, The process of obtaining the intermediate length corresponding to the load value based on the change in load value and the elongation of the steel strand corresponding to the load value includes: The intermediate length corresponding to the load is determined by the following formula: ； in, The intermediate length, The change in the load value, This refers to the elongation of the steel strand. The elastic modulus of the steel strand. Let be the cross-sectional area of ​​the steel strand.

5. The method according to claim 2, characterized in that, The step of obtaining the free segment length of the anchor cable based on the intermediate lengths corresponding to the multiple sets of loads includes: The average value of the intermediate lengths corresponding to the multiple loads is determined as the free end length of the anchor cable.

6. A device for detecting the free section length of a prestressed anchor cable, characterized in that, The device includes: A graded loading module is used to apply counter-tension to the steel strands in the anchor cable by means of a reaction frame installed on the anchor pier in the anchor cable, wherein the support surface of the reaction frame is perpendicular to the axis of the anchor cable. The recording module is used to start recording the load value during the elastic phase and the elongation of the steel strand corresponding to the load value when the wedge in the anchor cable disengages from the anchor plate in the anchor cable. The free segment length determination module is used to determine the free segment length of the anchor cable based on multiple sets of recorded load values ​​and the elongation of the steel strands corresponding to the multiple sets of load values.

7. The apparatus according to claim 6, characterized in that, The free segment length determination module is specifically used for: For any set of load values, based on the load values ​​and the previous set of load values, the change in load value corresponding to the load value is obtained; Based on the change in load value and the elongation of the steel strand corresponding to the load value, the intermediate length corresponding to the load value is obtained; The free segment length of the anchor cable is obtained based on the intermediate lengths corresponding to the multiple sets of load values.

8. An electronic device, characterized in that, The electronic device includes at least one processor; and a memory communicatively connected to the at least one processor; wherein... The memory stores a computer program that is executed by the at least one processor, which enables the at least one processor to perform the method for detecting the free length of a prestressed anchor cable according to any one of claims 1-5.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method for detecting the free length of a prestressed anchor cable as described in any one of claims 1-5.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method for detecting the free length of a prestressed anchor cable according to any one of claims 1-5.

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