Pre-stressed anchor cable structure and pre-stressed anchor cable system

Abstract

The utility model belongs to the technical field of anchor cable engineering safety monitoring, and particularly relates to a pre-stressed anchor cable structure and a pre-stressed anchor cable system. The pre-stressed anchor cable structure comprises an anchor cable, a sensing optical cable and an anchor plate, the anchor plate is provided with an anchor cable mounting hole and a sensing optical cable mounting hole, a first fixing sleeve is arranged in the sensing optical cable mounting hole in a penetrating mode, the first fixing sleeve is fixedly connected with the anchor plate, the sensing optical cable is arranged in the first fixing sleeve in a penetrating mode, and a filling piece is arranged in the first fixing sleeve. The filling piece is in extrusion contact with the outer wall of the sensing optical cable, an anchor cable penetrates through the anchor cable mounting hole, and the anchor cable and the sensing optical cable are anchored into a rock-soil body. By using the pre-stressed anchor cable structure in the technical scheme, the sensing optical cable and the anchor plate can be assembled, and the sensing optical cable and the anchor cable synchronously generate tensile deformation, so that an accurate monitoring result can be obtained, and long-distance long-term dynamic monitoring of the strain of the anchor cable is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor cable engineering safety monitoring, in particular to a prestressed anchor cable structure and a prestressed anchor cable system. Background Art

[0002] Prestressed anchor cables refer to cable-shaped brackets that are anchored inside the rock and soil body by prestressing methods, and are used to reinforce slopes. The anchor cables are anchored into the rock and soil body through the holes on the weak structural surface of the rock and soil body by the anchor head, connecting the sliding body and the stable rock layer together, thereby changing the stress state of the rock and soil body of the slope and improving the integrity and strength of the unstable rock and soil body of the slope. In order to ensure the internal stability of the rock and soil body, prestressed anchor cables usually need to operate stably for a long time. Therefore, it is necessary to monitor the strain of prestressed anchor cables in real time. By real-time monitoring of the internal deformation of the rock and soil body, it is possible to understand the state of the rock and soil body in a timely manner, and to provide timely warnings for possible hidden dangers, effectively avoiding casualties and property losses.

[0003] At present, the main monitoring methods for prestressed anchor cables in geotechnical engineering include traditional resistance strain gauges, differential resistance strain gauges, steel string frequency sensors, etc. However, traditional resistance strain gauges need to be pasted on the deformable body, which is easily damaged during construction, installation and later use; differential resistance strain gauges output analog signals, which cannot meet the needs of long-distance transmission and monitoring; steel string frequency sensors have limited sensitivity and cannot perform long-term dynamic monitoring. Optical fiber sensing technology monitors the strain of anchor cables, which can not only achieve long-term dynamic monitoring over long distances, but also is not affected by the electromagnetic environment, has high accuracy and good stability. However, the prestressed anchor cable anchor plates currently used in actual engineering applications are not suitable for the installation of sensing optical cables.

[0004] Therefore, it is urgent to propose a prestressed anchor cable structure and a strain monitoring method to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to at least solve the problem that the existing anchor plate cannot be equipped with a sensor optical cable. This purpose is achieved through the following technical solutions:

[0006] The first aspect of the utility model provides a prestressed anchor cable structure, comprising:

[0007] Anchor cable, sensor optical cable and anchor plate, the anchor plate is provided with an anchor cable mounting hole and a sensor optical cable mounting hole, a first fixing sleeve is passed through the sensor optical cable mounting hole, the first fixing sleeve and the anchor plate are fixedly connected, the sensor optical cable is passed through the first fixing sleeve, a filling piece is provided in the first fixing sleeve, the filling piece and the outer wall of the sensor optical cable are in extrusion contact, the anchor cable mounting hole is used for passing the anchor cable, and the anchor cable and the sensor optical cable are both used for anchoring into the interior of the rock and soil body.

[0008] By using the prestressed anchor cable structure in the present technical solution, the sensing optical cable is passed through the sensing optical cable installation hole, and the anchor cable is passed through the anchor cable installation hole, so as to realize the installation of the sensing optical cable and the anchor cable on the anchor plate. The sensing optical cable is passed through the first fixing sleeve, and a filling member is filled in the first fixing sleeve, so that the filling member is in close contact with the sensing optical cable, and a large frictional force is formed between the two. The anchor cable and the sensing optical cable are simultaneously anchored into the interior of the rock and soil mass. The sensing optical cable can undergo tensile deformation synchronously with the anchor cable. However, due to the tangential frictional force between the sensing optical cable and the filling member, the sensing optical cable will not undergo deformations that affect the detection effect other than stretching, such as torsion or sliding, so as to obtain accurate monitoring results and realize long-distance long-term dynamic monitoring of the anchor cable strain.

[0009] In addition, according to the prestressed anchor cable structure of the present utility model, the following additional technical features may also be provided:

[0010] In some embodiments of the present utility model, an external thread is provided on the outer wall of the first fixing sleeve, an internal thread is provided in the sensing optical cable installation hole, and the first fixing sleeve and the sensing optical cable installation hole are threadedly connected through the external thread and the internal thread.

[0011] In some embodiments of the present utility model, the first fixing sleeve has a first port, a reduced-diameter section, and a second port that are sequentially communicated. The inner diameter of the first port is smaller than the inner diameter of the second port. Along the direction from the second port to the first port, the inner diameter of the reduced-diameter section gradually decreases, and the filling member is located inside the reduced-diameter section.

[0012] In some embodiments of the present utility model, the prestressed anchor cable structure further includes a second fixing sleeve. The second fixing sleeve includes a connecting sleeve and an elastic sleeve that are connected to each other. The open end of the elastic sleeve faces the first fixing sleeve and is inserted into the interior of the reduced-diameter section. The filling member is located inside the elastic sleeve. The inner wall of the reduced-diameter section is in pressing contact with the outer wall of the elastic sleeve, and the inner wall of the elastic sleeve is in pressing contact with the outer wall of the filling member. The connecting sleeve and the first fixing sleeve are fixedly connected.

[0013] In some embodiments of the present utility model, the elastic sleeve includes a plurality of elastic teeth, and the elastic teeth are arranged at intervals along the circumferential direction of the port of the connecting sleeve.

[0014] In some embodiments of the present utility model, an external thread is provided on the outer wall of the connecting sleeve, an internal thread is provided on the inner wall of the first fixing sleeve, and the connecting sleeve and the first fixing sleeve are threadedly connected through the external thread and the internal thread.

[0015] In some embodiments of the present utility model, the connecting sleeve includes a first section and a second section connected to each other. The outer diameter of the first section is smaller than that of the second section. A stepped surface is formed between the first section and the second section. The elastic sleeve is connected to the first section. The first section is threadedly connected to the first fixing sleeve. The stepped surface abuts against the port of the first fixing sleeve. The second section is threadedly connected to the cable anchor installation hole.

[0016] In some embodiments of the present utility model, the prestressed cable anchor structure further includes a first connecting member and a second connecting member. The first connecting member is connected to one end of the first fixing sleeve extending out of the anchor plate. The second connecting member is connected to one end of the second fixing sleeve extending out of the anchor plate. The first connecting member and the second connecting member respectively abut against two end faces of the anchor plate.

[0017] In some embodiments of the present utility model, both the first connecting member and the second connecting member include two nuts with opposite internal thread helix directions. Opposite threads are respectively provided on the outer walls of the first fixing sleeve and the second fixing sleeve for threaded connection with the nuts.

[0018] The present utility model also provides a prestressed cable anchor system, which includes an optical modem and the prestressed cable anchor structure in the above embodiments. The sensing optical cable is connected to the optical modem. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0020] Figure 1 is a partial structural schematic diagram of the prestressed cable anchor structure provided by the present utility model;

[0021] Figure 2 is a partial structural exploded view of the prestressed cable anchor structure provided by the present utility model;

[0022] Figure 3 is a structural schematic diagram of the prestressed cable anchor structure provided by the present utility model in the working state.

[0023] In the figure:

[0024] 10. Rock and soil mass; 100. Anchor cable; 200. Sensing optical cable; 300. Anchor plate; 310. Anchor cable installation hole; 320. Sensing optical cable installation hole; 400. First fixing sleeve; 410. First port; 420. Second port; 430. Reducing section; 440. First fixing sleeve connection section; 500. Filler; 600. Second fixing sleeve; 610. Connecting sleeve; 611. First section; 612. Second section; 620. Elastic sleeve; 700. First connecting piece; 800. Second connecting piece; 900. Anchor backing plate. Detailed implementation manners

[0025] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0026] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless otherwise clearly specified in the context, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing" and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the execution order is clearly stated. It should also be understood that additional or alternative steps may be used.

[0027] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless clearly specified in the context, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used herein. Therefore, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0028] For ease of description, spatial relative relationship terms may be used in the text to describe the relationship of one element or feature shown in the figure relative to another element or feature. These relative relationship terms are, for example, "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation in addition to the orientations depicted in the figure. For example, if the device in the figure is flipped, the element described as "below other elements or features" or "beneath other elements or features" will then be oriented as "above other elements or features" or "over other elements or features". Thus, the exemplary term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are accordingly interpreted.

[0029] See Figure 1 and Figure 2 Referring to Figure 1 and Figure 2 , this embodiment provides a prestressed anchor cable structure, which includes an anchor cable 100, a sensing optical cable 200, and an anchor plate 300. An anchor cable installation hole 310 and a sensing optical cable installation hole 320 are provided on the anchor plate 300. A first fixing sleeve 400 is inserted into the sensing optical cable installation hole 320. The first fixing sleeve 400 is fixedly connected to the anchor plate 300. The sensing optical cable 200 is inserted into the first fixing sleeve 400. A filling member 500 is arranged in the first fixing sleeve 400. The filling member 500 is in extrusion contact with the outer wall of the sensing optical cable 200. The anchor cable installation hole 310 is used for inserting the anchor cable 100. Both the anchor cable 100 and the sensing optical cable 200 are used for being anchored into the interior of the rock and soil mass 10.

[0030] The above prestressed anchor cable structure realizes the installation of the sensing optical cable 200 and the anchor cable 100 on the anchor plate 300 by providing a sensing optical cable installation hole 320 and an anchor cable installation hole 310 on the anchor plate 300, passing the sensing optical cable 200 through the sensing optical cable installation hole 320, and passing the anchor cable 100 through the anchor cable installation hole 310. The sensing optical cable 200 is passed through the first fixing sleeve 400, and the filling member 500 is filled in the first fixing sleeve 400, so that the filling member 500 is in close contact with the sensing optical cable 200, and a large frictional force is formed between the two. The anchor cable 100 and the sensing optical cable 200 are simultaneously anchored into the interior of the rock and soil mass. The sensing optical cable 200 can undergo tensile deformation synchronously with the anchor cable 100. However, due to the tangential frictional force between the sensing optical cable 200 and the filling member 500, the sensing optical cable 200 will not undergo deformations such as torsion or sliding that affect the detection effect other than stretching, so that accurate monitoring results can be obtained, and long-distance long-term dynamic monitoring of the strain of the anchor cable 100 can be realized.

[0031] Continue to refer to Figure 1 and Figure 2, in this embodiment, the anchor plate 300 is a circular plate-like structure, and both the cable anchor installation hole 310 and the sensing optical cable installation hole 320 are circular holes. Optionally, the sensing optical cable installation hole 320 is located at the center of the anchor plate 300, and there are multiple cable anchor installation holes 310. The multiple cable anchor installation holes 310 are distributed in a circular array around the sensing optical cable installation hole 320. In this embodiment, the number of cable anchor installation holes 310 is 4. In other embodiments, the number of cable anchor installation holes 310 can be 1, 2, 3, 5, 6, etc., which can be set according to actual usage needs. The intervals between adjacent two cable anchor installation holes 310 can be the same or different, and no specific limitation is made here. Optionally, the bottom of the anchor plate 300 is supported by an anchor backing plate 900.

[0032] See Figure 2 and Figure 3 , in this embodiment, the filler 500 is a columnar tube sleeve structure. Optionally, the filler 500 can be a silica gel sleeve or a rubber sleeve, so that it will deform when being extruded and be in close contact with the sensing optical cable 200. It can be understood that the filler 500 is made of silica gel or rubber, which can make the filler 500 have a large friction coefficient. After the filler 500 and the sensing optical cable 200 are in close contact, there is sufficient tangential frictional force between the two, which can effectively prevent the sensing optical cable 200 from undergoing deformations such as torsion or sliding that affect the detection effect except for stretching.

[0033] Furthermore, an external thread is provided on the outer wall of the first fixing sleeve 400, and an internal thread is provided in the sensing optical cable installation hole 320. The first fixing sleeve 400 and the sensing optical cable installation hole 320 are threadedly connected through the external thread and the internal thread. By threadedly connecting the first fixing sleeve 400 to the sensing optical cable installation hole 320, the rotation or axial movement of the first fixing sleeve 400 during operation is prevented, ensuring the stability of the structure.

[0034] Furthermore, see Figure 2 , the first fixing sleeve 400 has a first port 410, a reduced-diameter section 430, and a second port 420 that are sequentially communicated. The inner diameter of the first port 410 is smaller than the inner diameter of the second port 420. Along the direction from the second port 420 to the first port 410, the inner diameter of the reduced-diameter section 430 gradually decreases, and the filler 500 is located inside the reduced-diameter section 430.

[0035] Understandably, the inner diameter of the second port 420 is larger than that of the first port 410, facilitating the insertion of the first fixing sleeve 400 into the second fixing sleeve 600. By providing a reduced-diameter section 430 on the first fixing sleeve 400, the filling member 500 deforms according to the shape inside the reduced-diameter section 430 after being inserted into the first fixing sleeve 400, that is, the bottom of the filling member 500 undergoes radial deformation to tightly press the sensing optical cable 200. Optionally, in some embodiments, the inside of the reduced-diameter section 430 is a frustum-shaped cavity, and in other embodiments, the inside of the reduced-diameter section 430 can be a stepped cavity. Understandably, the inner diameter of the filling member 500 and the inner diameter of the reduced-diameter section 430 are set according to the thickness of the sensing optical cable 200 to ensure that the filling member 500 can tightly sleeve the sensing optical cable 200 after assembly.

[0036] Furthermore, the prestressed anchor cable structure further includes a second fixing sleeve 600. The second fixing sleeve 600 includes a connecting sleeve 610 and an elastic sleeve 620 that are connected to each other. The open end of the elastic sleeve 620 faces the first fixing sleeve 400 and is inserted into the reduced-diameter section 430. The filling member 500 is located inside the elastic sleeve 620. The inner wall of the reduced-diameter section 430 and the outer wall of the elastic sleeve 620 are in extrusion contact, and the inner wall of the elastic sleeve 620 and the outer wall of the filling member 500 are in extrusion contact. The connecting sleeve 610 is fixedly connected to the first fixing sleeve 400. After the elastic sleeve 620 is inserted into the reduced-diameter section 430, the inner diameter of the reduced-diameter section 430 gradually decreases from the direction of the second port 420 to the first port 410. Therefore, the elastic sleeve 620 is subjected to the pressure of the reduced-diameter section 430, and its shape changes according to the inner diameter of the reduced-diameter section 430. Furthermore, the elastic sleeve 620 squeezes the filling member 500 to tightly sleeve the filling member 500 on the sensing optical cable 200.

[0037] As Figure 2 and Figure 3 shown, in some embodiments, the elastic sleeve 620 includes a plurality of elastic teeth, and the elastic teeth are arranged at intervals along the circumference of the port of the connecting sleeve 610. The elastic teeth have the ability of elastic deformation, and each elastic tooth can undergo a radial retraction displacement without being damaged. Understandably, when the elastic sleeve 620 is inserted into the reduced-diameter section 430, the free ends of the elastic teeth gradually contract towards the center until the filling member 500 and the sensing optical cable 200 are tightly pressed. Exemplarily, the material of the elastic teeth can be rubber, plastic, or deformable metal material, etc., as long as it can deform under the extrusion of the reduced-diameter section 430. Optionally, the width, length, and number of the elastic teeth are set according to the usage needs and are not specifically limited here. The elastic teeth can be connected to the connecting sleeve 610 by bonding or welding.

[0038] Further, an external thread is provided on the outer wall of the connecting sleeve 610, and an internal thread is provided on the inner wall of the first fixing sleeve 400. The connecting sleeve 610 and the first fixing sleeve 400 are threadedly connected through the external thread and the internal thread. By threadedly connecting the connecting sleeve 610 and the first fixing sleeve 400, the fixation of the first fixing sleeve 400 and the second fixing sleeve 600 is realized, which is convenient for connection, has high stability, and effectively avoids relative rotation or movement between the second fixing sleeve 600 and the first fixing sleeve 400.

[0039] Further, the connecting sleeve 610 includes a first section 611 and a second section 612 that are connected to each other. The outer diameter of the first section 611 is smaller than the outer diameter of the second section 612. A stepped surface is formed between the first section 611 and the second section 612. The elastic sleeve 620 is connected to the first section 611. The first section 611 is threadedly connected to the first fixing sleeve 400. The stepped surface abuts against the port of the first fixing sleeve 400. The second section 612 is threadedly connected to the anchor cable installation hole 310. By setting the connecting sleeve 610 in a structural form with a first section 611 and a second section 612 having different outer diameters, a stepped surface that abuts against the first fixing sleeve 400 can be generated, so that the overall structure is more compact and the structural stability is better. Optionally, a first fixing sleeve connection section 440 is provided between the reduced diameter section 430 and the second port 420. The reduced diameter section 430 and the second port 420 communicate through the first fixing sleeve connection section 440. An internal thread is provided on the inner wall of the first fixing sleeve connection section 440. The first section 611 is threadedly connected to the first fixing sleeve connection section 440. Optionally, the first section 611 and the second section 612 are of an integrally formed structural form, and the inner diameters of the first section 611 and the second section 612 can be the same or different.

[0040] Further, the prestressed anchor cable structure further includes a first connecting member 700 and a second connecting member 800. The first connecting member 700 is connected to one end of the first fixing sleeve 400 extending out of the anchor plate 300. The second connecting member 800 is connected to one end of the second fixing sleeve 600 extending out of the anchor plate 300. The first connecting member 700 and the second connecting member 800 respectively abut against the two end faces of the anchor plate 300. By connecting the first connecting member 700 and the second connecting member 800 to the first fixing sleeve 400 and the second fixing sleeve 600 respectively, and the first connecting member 700 and the second connecting member 800 respectively abut against the two end faces of the anchor plate 300, the first fixing sleeve 400 and the second fixing sleeve 600 are locked to the anchor plate 300, preventing the first fixing sleeve 400 and the second fixing sleeve 600 from axially moving relative to the anchor plate 300 and ensuring the stability of the structure.

[0041] Further, both the first connecting member 700 and the second connecting member 800 include two nuts with opposite internal thread helix directions, and external walls of the first fixing sleeve 400 and the second fixing sleeve 600 are respectively provided with double-threads threadedly connected to the nuts. Further, the double-threads on the second fixing sleeve 600 are provided on the second section 612 of the second fixing sleeve 600. Optionally, in some embodiments, a part of the double-threads on the first fixing sleeve 400 is used for threadedly connecting to the sensing optical cable installation hole 320, and a part is used for threadedly connecting to the first connecting member 700; a part of the double-threads on the second section 612 of the second fixing sleeve 600 is used for threadedly connecting to the sensing optical cable installation hole 320, and a part is used for threadedly connecting to the second connecting member 800. By using double-threads, it is possible to prevent relative rotation between the first fixing sleeve 400 and the anchor plate 300, or relative rotation between the second fixing sleeve 600 and the first fixing sleeve 400 during the process of screwing the nuts.

[0042] During the actual assembly process of the prestressed anchor cable structure provided in this embodiment, first, screw the first fixing sleeve 400 onto the sensing optical cable installation hole 320, and screw the first connecting member 700 onto the first fixing sleeve 400. Then, pass the sensing optical cable 200 through the first fixing sleeve 400. Subsequently, place the filling member 500 into the second fixing sleeve 600, pass the sensing optical cable 200 through the filling member 500 and the second fixing sleeve 600, tighten the second fixing sleeve 600, the first fixing sleeve 400, and the sensing optical cable installation hole 320, and finally tighten the second connecting member 800 onto the second fixing sleeve 600.

[0043] This embodiment also provides a prestressed anchor cable system, including an optical modem and the above-mentioned prestressed anchor cable structure, wherein the sensing optical cable 200 is connected to the optical modem. Integrating the sensing optical cable 200 with the optical modem and using the optical modem to perform physical property tests in the field of civil engineering construction is a mature prior art in this field and will not be elaborated here.

[0044] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A prestressed anchor cable structure, characterized in that: include: An anchor cable (100), a sensing optical cable (200) and an anchor plate (300), wherein the anchor plate (300) is provided with an anchor cable mounting hole (310) and a sensing optical cable mounting hole (320), wherein a first fixing sleeve (400) is inserted into the sensing optical cable mounting hole (320), wherein the first fixing sleeve (400) and the anchor plate (300) are fixedly connected, wherein the sensing optical cable (200) is inserted into the first fixing sleeve (400), wherein a filling piece (500) is arranged in the first fixing sleeve (400), wherein the filling piece (500) and the outer wall of the sensing optical cable (200) are in compression contact, wherein the anchor cable mounting hole (310) is used for inserting the anchor cable (100), wherein the anchor cable (100) and the sensing optical cable (200) are both used for being anchored into the interior of a rock mass (10).

2. The prestressed anchor cable structure according to claim 1, characterized in that: The outer wall of the first fixing sleeve (400) is provided with an external thread, the sensing optical cable installation hole (320) is provided with an internal thread, and the first fixing sleeve (400) and the sensing optical cable installation hole (320) are threadedly connected via the external thread and the internal thread.

3. The prestressed anchor cable structure according to claim 1 or 2, characterized in that: The first fixed sleeve (400) comprises a first port (410), a reducing section (430) and a second port (420) which are connected in sequence, the inner diameter of the first port (410) is smaller than the inner diameter of the second port (420), and the inner diameter of the reducing section (430) gradually decreases along the direction from the second port (420) to the first port (410), and the filling piece (500) is located inside the reducing section (430).

4. The prestressed anchor cable structure according to claim 3, characterized in that: The prestressed anchor cable structure further comprises a second fixing sleeve (600), the second fixing sleeve (600) comprising a connecting sleeve (610) and an elastic sleeve (620) which are connected to each other, the opening end of the elastic sleeve (620) is inserted into the reducing section (430) towards the first fixing sleeve (400), the filling piece (500) is located in the elastic sleeve (620), the inner wall of the reducing section (430) and the outer wall of the elastic sleeve (620) are in compression contact, the inner wall of the elastic sleeve (620) and the outer wall of the filling piece (500) are in compression contact, and the connecting sleeve (610) and the first fixing sleeve (400) are fixedly connected.

5. The prestressed anchor cable structure according to claim 4, characterized in that: The elastic sleeve (620) comprises a plurality of elastic teeth, and the elastic teeth are arranged at intervals along the circumference of the port of the connecting sleeve (610).

6. The prestressed anchor cable structure according to claim 4 or 5, characterized in that: The outer wall of the connecting sleeve (610) is provided with an external thread, and the inner wall of the first fixing sleeve (400) is provided with an internal thread. The connecting sleeve (610) and the first fixing sleeve (400) are threadedly connected via the external thread and the internal thread.

7. The prestressed anchor cable structure according to claim 6, characterized in that: The connecting sleeve (610) comprises a first section (611) and a second section (612) which are connected to each other, the outer diameter of the first section (611) is smaller than the outer diameter of the second section (612), a step surface is formed between the first section (611) and the second section (612), the elastic sleeve (620) is connected to the first section (611), the first section (611) and the first fixing sleeve (400) are threadedly connected, the step surface abuts against a port of the first fixing sleeve (400), and the second section (612) and the anchor cable mounting hole (310) are threadedly connected.

8. The prestressed anchor cable structure according to claim 4, characterized in that: The prestressed anchor cable structure further comprises a first connecting member (700) and a second connecting member (800), wherein the first connecting member (700) is connected to one end of the first fixing sleeve (400) extending out of the anchor plate (300), and the second connecting member (800) is connected to one end of the second fixing sleeve (600) extending out of the anchor plate (300), and the first connecting member (700) and the second connecting member (800) are respectively abutted against two end surfaces of the anchor plate (300).

9. The prestressed anchor cable structure according to claim 8, characterized in that: The first connecting member (700) and the second connecting member (800) each comprise two nuts with internal threads in opposite directions, and the outer walls of the first fixing sleeve (400) and the second fixing sleeve (600) are respectively provided with bidirectional threads threadedly connected to the nuts.

10. A prestressed anchor cable system, characterized in that: It comprises an optical modem and the prestressed anchor cable structure as claimed in any one of claims 1 to 9, wherein the sensing optical cable (200) is signal-connected to the optical modem.

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