Direct-buried cable stake with visible burial depth and burial depth monitoring method

Abstract

The invention provides a buried-depth-visible directly-buried cable stake and a buried-depth monitoring method, the buried-depth-visible directly-buried cable stake comprises a stake body, a scale mechanism and a depth measuring scale, and the stake body is hollow to form a cavity; the scale mechanism is arranged in the cavity and detachably connected with the stake. The scale mechanism comprises an automatic winding mechanism mounted in an inner cavity of the scale mechanism; the depth measuring scale comprises a cable connecting end and a telescopic end, the cable connecting end of the depth measuring scale is connected with the cable, and the telescopic end of the depth measuring scale extends into the scale mechanism to be connected with the automatic winding mechanism. A scale structure and a depth measuring scale are arranged in the stake, the stake can automatically stretch and display the cable burial depth in the landfill process, construction and maintenance personnel can directly read burial depth data, and mechanical selection and construction strategies can be effectively guided in subsequent cross construction and third-party operation by accurately mastering the cable burial depth; cable damage caused by mistaken digging and digging is avoided, and safety accidents such as power failure and communication interruption are reduced.

Description

Technical Field

[0001] This application belongs to the field of underground pipeline facilities technology, specifically relating to a direct-buried cable marker with visible burial depth and a method for monitoring burial depth. Background Technology

[0002] Direct-buried cables (such as optical fibers and electrical cables) are widely laid underground. Accurately determining the burial depth of these cables is crucial for subsequent construction, maintenance, emergency repairs, and urban planning. Traditional cable markers can only mark the underground route of the cable and cannot provide burial depth information. Construction and maintenance personnel typically rely on as-built drawings or experience to estimate the burial depth, but drawings may not match reality, and factors such as soil settlement and subsequent backfilling can also change the original burial depth, leading to a significant risk of damaging the cable during excavation operations. Therefore, there is an urgent need for a type of direct-buried cable marker that can directly and reliably display the cable's location and visual burial depth. Summary of the Invention

[0003] Therefore, the purpose of this application is to provide a direct-buried cable marker with visible burial depth and a method for monitoring burial depth, thereby solving at least one of the technical problems mentioned in the background art.

[0004] To address the aforementioned issues, the first aspect of this application provides a directly buried cable marker with visible burial depth, comprising a marker, a measuring mechanism, and a depth measuring scale. The marker has a hollow interior forming a cavity. The measuring mechanism is disposed within the cavity and detachably connected to the marker. The measuring mechanism includes an automatic winding mechanism installed within its cavity. The depth measuring scale includes a cable connection end and a telescopic end. The cable connection end of the depth measuring scale is connected to a cable, and the telescopic end of the depth measuring scale extends into the measuring mechanism and connects to the automatic winding mechanism.

[0005] Optionally, an observation window is provided at the top of the marker to read the scale value of the depth measuring rod.

[0006] Optionally, the automatic winding mechanism includes a spring core, a spring, and a scale reel. The spring core has marker connecting blocks at both ends. The spring core is fixed to the inner wall of the scale mechanism via the marker connecting blocks. The scale reel is sleeved on the marker connecting blocks and positioned by their shoulders, so that a spring mounting cavity is formed between the scale reel and the spring core. The spring is sleeved on the spring core and located within the spring mounting cavity. The inner end of the spring is fixed to the spring core, and the outer end of the spring is engaged with the inner wall of the scale reel. The telescopic end of the depth measuring scale is connected to the scale reel.

[0007] Optionally, the spring constant is in the range of 5N / mm to 8N / mm, so that the depth gauge can be reliably retracted by the spring in its natural state, and can remain straight under the weight of the cable and soil pressure.

[0008] Optionally, the buried cable marker also includes a quick-release locking structure, which includes a locking block disposed on the side wall of the ruler mechanism and a slot disposed on the side wall of the marker; or a slot disposed on the side wall of the ruler mechanism and a locking block disposed on the side wall of the marker, wherein the locking block is at least partially engaged in the slot so that the ruler mechanism is installed on the marker.

[0009] Optionally, the cable connection end of the depth measuring scale is provided with a multi-adaptive interface. When the binding and fixing method is adopted, the cable connection end is provided with a ring buckle for threading the binding strap; when the clamp fixing method is adopted, the cable connection end is provided with a clamp. The clamp is an adjustable clamp composed of at least two arc-shaped clips and an adjusting bolt. One end of the two arc-shaped clips is rotatably connected, and the other end is connected through the adjusting bolt.

[0010] Optionally, the buried cable marker also includes a guide assembly disposed in the chamber of the marker (1) and located directly below the measuring scale mechanism (2), the guide assembly including at least a pair of guide wheels, and the depth measuring scale passing between the pair of guide wheels.

[0011] Optionally, the guide wheel has an annular limiting groove on its rim that matches the thickness of the depth measuring scale, for guiding and limiting the extension and retraction of the depth measuring scale.

[0012] Optionally, the stake includes a stake body and a top cover. The bottom end of the stake body is provided with an outlet for the cable connection end of the depth measuring scale to extend out. The top end of the stake body is an open end, and the top cover is placed on the open end of the stake body.

[0013] The second aspect of this application provides a method for monitoring the burial depth of directly buried cable markers based on the visible burial depth described in any one of the above-mentioned methods, comprising the following steps: During installation, the cable connection end of the depth measuring scale is fixed to the cable. As the backfill soil increases, the stake is raised, and the depth measuring scale extends out of the scale mechanism under the traction force of the cable fixing end. After the backfill is completed, the winding force of the automatic winding mechanism straightens the depth measuring scale, and the scale reading at this time is the current burial depth. When soil settlement occurs, the marker stake sinks with the soil, and the automatic rewinding mechanism retracts the excess depth gauge. The reading at this time is the burial depth after settlement.

[0014] By employing the above technical solution, the present invention has at least the following beneficial effects: This application provides a method for monitoring the burial depth of directly buried cables by providing a visible burial depth marker. By embedding a ruler structure and a depth measuring ruler inside the marker, the marker can automatically stretch and display the cable burial depth during the backfilling process. Construction and maintenance personnel can directly read the burial depth data. By accurately grasping the cable burial depth, it can effectively guide the selection of machinery and construction strategies in subsequent cross-construction and third-party operations, avoid cable damage caused by accidental digging or excavation, and reduce the occurrence of safety accidents such as power outages and communication interruptions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a directly buried cable marker with visible burial depth according to an embodiment of this application. Figure 2 This is a schematic diagram of a marker stake according to an embodiment of this application; Figure 3 This is a schematic diagram of the scale mechanism in an embodiment of this application; Figure 4 This is a top view of the top cover according to an embodiment of this application; Figure 5 This is a front view of the top cover according to an embodiment of this application; Figure 6 This is a schematic diagram of an automatic winding mechanism according to an embodiment of this application; Figure 7 This is a partial cross-sectional view of the automatic winding mechanism according to an embodiment of this application.

[0016] The reference numerals in the attached figures are as follows: 1. Marker stake; 101. Stake body; 102. Top cap; 2. Scale mechanism; 201. Spring spindle; 202. Spring; 203. Scale reel; 204. Marker connecting block; 205. Spring embedding groove; 3. Depth gauge; 4. Hoop; 5. Card slot; 6. Locking block; 7. Observation window. Detailed Implementation

[0017] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] See also Figures 1 to 7 As shown, according to a first aspect of the embodiments of this application, a direct-buried cable marker with visible burial depth is provided, including a marker 1, a ruler mechanism 2, and a depth measuring ruler 3. The marker 1 has a hollow interior forming a cavity; the ruler mechanism 2 is disposed in the cavity and is detachably connected to the marker 1; the ruler mechanism 2 includes an automatic winding mechanism installed in its inner cavity; the depth measuring ruler 3 includes a cable connection end and a telescopic end, the cable connection end of the depth measuring ruler 3 is connected to a cable, and the telescopic end of the depth measuring ruler 3 extends into the interior of the ruler mechanism 2 and is connected to the automatic winding mechanism.

[0022] By incorporating a ruler structure 2 and a depth measuring ruler 3 within the marker 1, the marker 1 can automatically stretch and display the cable burial depth during the backfilling process. Construction and maintenance personnel can directly read the burial depth data. By accurately grasping the cable burial depth, it can effectively guide the selection of machinery and construction strategies in subsequent cross-construction and third-party operations, avoid cable damage caused by accidental digging or excavation, and reduce the occurrence of safety accidents such as power outages and communication interruptions.

[0023] The depth measuring rod 3 includes a cable connection end and a telescopic end. The cable connection end of the depth measuring rod 3 is connected to the cable, and the telescopic end of the depth measuring rod 3 extends into the inside of the measuring rod mechanism 2 and is connected to the automatic winding mechanism. That is, the measuring rod mechanism 2 is provided with an inlet, and the telescopic end of the depth measuring rod 3 passes through the inlet and is connected to the automatic winding mechanism located inside the measuring rod mechanism 2. The cable connection end of the depth measuring rod 3 extends out from the bottom of the stake 1 and is connected to the cable.

[0024] Specifically, the depth measuring rod 3 is a flexible strip-shaped rod.

[0025] The scale mechanism 2 has an automatic winding mechanism built in. The automatic winding mechanism provides a continuous winding force to the depth measuring scale 3, which is directed toward the inside of the scale mechanism 2. The automatic winding of the depth measuring scale 3 can be achieved without the need for external force.

[0026] Among them, the direct-buried cable marker also includes a coding plate, which is set on the inner wall of the ruler mechanism 2. The current burial depth after backfilling is printed on the coding plate so that construction and maintenance personnel can directly read the burial depth data, which can effectively guide the selection of machinery and construction strategies in subsequent cross-construction and third-party operations.

[0027] The inkjet tag can also serve as a physical identifier (ID) for directly buried cables. On the one hand, it can be used to build electronic files for this type of cable, and on the other hand, it can serve as a reference for querying cable asset management. Through this inkjet tag, various management data such as cable asset information, cable start and end locations, cable laying paths, and cable model specifications can be quickly viewed and retrieved.

[0028] In another embodiment, an observation window 7 is provided on the top of the stake 1, through which the scale value of the depth measuring rod 3 is read.

[0029] Among them, the top of the marker 1 is provided with an observation window 7, which is sealed to the top of the marker 1.

[0030] The observation window 7 is made of transparent and wear-resistant material. The current burial depth value on the depth measuring scale 3 can be read directly through the observation window 7, thereby determining the actual burial depth of the cable and providing depth data support for subsequent construction, maintenance and emergency repair.

[0031] Specifically, the lead-out end of the depth measuring scale 3 of the scale mechanism 2 faces the top of the stake 1, ensuring that the reading on the depth measuring scale 3 can be accurately read through the observation window 7.

[0032] In another embodiment, the automatic winding mechanism includes a spring core 201, a spring 202, and a scale reel 203. The spring core 201 has marker connecting blocks 204 at both ends. The spring core 201 is fixed to the inner wall of the scale mechanism 2 via the marker connecting blocks 204. The scale reel 203 is sleeved on the marker connecting blocks 204 and positioned by their shoulders, forming a spring mounting cavity between the scale reel 203 and the spring core 201. The spring 202 is sleeved on the spring core 201 and located within the spring mounting cavity. The inner end of the spring 202 is fixed to the spring core 201, and the outer end of the spring 202 is engaged with the inner wall of the scale reel 203. The telescopic end of the depth measuring scale 3 is connected to the scale reel 203. The spring 201 always provides a rebound force pointing inwards towards the scale mechanism 2 for the depth measuring scale 3. This force ensures that the depth gauge 3 remains taut after being pulled out, effectively avoiding reading errors caused by gauge slackness or bending, and ensuring the accuracy and reliability of the minimum burial depth data display. Simultaneously, the automatic rewind mechanism gives the depth gauge 3 dynamic response capability. When the backfill soil around the marker 1 settles, the marker 1 descends accordingly. At this time, under the action of the spring's rebound force, the depth gauge 3 will automatically retract partially, thus always indicating the real-time, accurate minimum burial depth between the cable and the marker 1 base (i.e., the ground reference).

[0033] The spring core 201 is provided with marker connecting blocks 204 at both ends. The marker connecting blocks 204 are used to install the spring core 201 on the inner wall of the scale mechanism 2, and to install the scale roll 203, so that the scale roll 203 is coaxial with the spring core 201 and the scale roll 203 is relative to the spring core 201.

[0034] The scale roll 203 consists of a hollow cylinder and discs at both ends of the hollow cylinder. A spring mounting cavity is formed between the hollow cylinder and the spring core 201. A spring embedding groove 205 is provided on the inner wall of the hollow cylinder. The telescopic end of the depth measuring scale 3 is locked in the spring embedding groove 205 and wound around the scale roll 203.

[0035] The specific implementation process is as follows: When the sounding scale 3 is pulled out (energy storage process), the pulling force causes the scale reel 203 to rotate, forcing the spring 202 to tighten. During this process, the elastic potential energy (mechanical energy) of the spring 202 continuously increases, storing power for automatic retraction. When the sounding scale 3 retracts (energy release process), after the external force is released, the tightened spring 202 releases its stored elastic potential energy, driving the scale reel 203 to rotate in the opposite direction, automatically rewinding the sounding scale 3 and retracting it into the scale mechanism 2 until the tension is balanced.

[0036] In another embodiment, the spring constant is in the range of 5N / mm to 8N / mm, so that the depth measuring scale 3 can be reliably retracted by the spring in its natural state, and can remain straight under the weight of the cable and soil pressure.

[0037] The limited spring constant provides sufficient and appropriate rebound force. In its natural state, i.e., when no external force is applied to the depth measuring scale 3, this rebound force can overcome the weight of the depth measuring scale 3 itself and the friction within the mechanism, driving the scale reel 203 to reverse and completely and smoothly retract the depth measuring scale 3 into the scale mechanism 2, avoiding problems such as scale jamming and inability to reset caused by insufficient retraction.

[0038] When the sounding gauge 3 is pulled out and bears the weight of the cable and the pressure of the surrounding soil, the rebound force provided by this elastic coefficient range can effectively counteract the aforementioned sag and external pressure, keeping the sounding gauge 3 in a taut and straight state. This prevents the sounding gauge 3 from bending due to slack under stress, ensuring that the scale value read through the observation window 7 accurately reflects the actual burial depth of the cable, fundamentally eliminating measurement errors caused by the bending of the sounding gauge 3.

[0039] In another embodiment, the buried cable marker also includes a quick-release locking structure, which includes a locking block 6 disposed on the side wall of the ruler mechanism 2 and a slot 5 disposed on the side wall of the marker 1; or a slot 5 disposed on the side wall of the ruler mechanism 2 and a locking block 6 disposed on the side wall of the marker 1, wherein the locking block 6 is at least partially engaged with the slot 5, so that the ruler mechanism 2 is installed on the marker 1. By using the quick-release locking mechanism to detachably install the ruler mechanism 2 on the marker 1, when precision components such as the coil spring and depth gauge 3 inside the ruler mechanism 2 need maintenance or are damaged due to long-term use, it is not necessary to replace the entire marker 1; the old mechanism can be quickly removed by hand and replaced with the new mechanism, which greatly reduces maintenance time, difficulty and cost.

[0040] In this design, the slot 5, whether on the marking mechanism 2 or the marker 1, is not a single hole on the side wall of either device. Instead, it is a separate slot fixed to the outer wall of the marking mechanism 2 or the inner wall of the marker 1 by bolts, rivets, or welding. Similarly, the locking block 6 is also fixed to the outer wall of the marking mechanism 2 or the inner wall of the marker 1 by bolts, rivets, or welding. The slot 5 or locking block 6 enables a quick and detachable connection between the ruler mechanism 2 and the marker 1, facilitating future maintenance.

[0041] The ruler mechanism 2 has locking blocks 6 or slots 5 on its opposite sidewalls, and the marker stake 1 has slots 5 or locking blocks 6 on its opposite inner sidewalls. This symmetrical arrangement ensures that the ruler mechanism 2 is subjected to uniform force on the marker stake 1, resulting in better installation stability.

[0042] Specifically, the inlet end of the slot 5 is trumpet-shaped to facilitate the installation of the locking block 6 on the slot 5.

[0043] The specific implementation process is as follows: During installation, align the scale mechanism 2 with the mounting opening at the top of the stake 1, and apply downward pressure vertically. This causes the locking block 6 to contact the edge of the slot 5 and undergo slight elastic deformation until the locking block 6 clicks and slides completely into the slot 5, achieving self-locking. No tools are required during the installation process. During disassembly, when maintenance or replacement is needed, the worker simply pulls the scale mechanism 2 upwards by hand to overcome the friction and slight deformation of the locking surface, allowing the locking block 6 to slide out of the slot 5, thus achieving quick separation.

[0044] In another embodiment, the cable connection end of the depth gauge 3 is equipped with a multi-adaptive interface. When the binding method is used, the cable connection end is provided with a ring buckle for threading the binding strap; when the clamp 4 method is used, the cable connection end is provided with a clamp 4, which is an adjustable clamp 4 consisting of at least two arc-shaped clips and an adjusting bolt. One end of the two arc-shaped clips is rotatably connected, and the other end is connected through the adjusting bolt. By using either the binding or clamp 4 connection method, the overall applicability is improved. At the same time, both connection methods have the advantages of simple structure and convenient operation. Construction personnel can quickly select the appropriate fixing method according to the site conditions and complete the installation without special tools or complicated procedures, effectively improving the overall efficiency of cable laying and gauge 1 installation.

[0045] When using a binding method, at least two loop fasteners are required. Using at least two loop fasteners in the binding method effectively distributes the force on the binding tape, preventing loosening or detachment caused by single-point stress, and enhancing the reliability of the connection.

[0046] When using clamp 4 for fixing, one end of the two arc-shaped clips is rotatably connected, meaning clamp 4 connects to the cable connection end through the rotating end of the arc-shaped clips without affecting the rotation function of the two arc-shaped clips. The other end is connected via an adjusting bolt, which changes the distance between the two arc-shaped clips to accommodate cables with diameters ranging from 50mm to 200mm. Clamp 4's fixing method features an adjustable design; the clamping force can be precisely controlled via the adjusting bolt, ensuring a tight fit with the cable body and providing a more robust and mechanically strong connection.

[0047] Specifically, the inner wall of the arc-shaped clip is equipped with a rubber pad to prevent damage to the cable during clamping.

[0048] In another embodiment, the buried cable marker also includes a guide assembly disposed in the cavity of the marker (1) and located directly below the scale mechanism 2, the guide assembly including at least a pair of guide wheels, through which the depth measuring scale 3 passes.

[0049] The guide assembly is located directly below the scale mechanism 2. The guide assembly is fixed to the inner wall of the stake 1 by the wheel frame of the guide wheel. The gap between a pair of guide wheels forms the passage path of the depth measuring scale 3. The guide wheels clamp the depth measuring scale 3 from two opposite directions, constraining it to move only on a preset straight path, effectively preventing the depth measuring scale 3 from lateral deviation or swinging when it extends or retracts.

[0050] In another embodiment, the guide wheel has an annular limiting groove on its rim that matches the thickness of the depth measuring scale 3, which is used to guide and limit the extension and retraction movement of the depth measuring scale 3.

[0051] The annular limiting groove ensures that the groove walls on both sides firmly lock the depth measuring scale 3 on the correct track, ensuring the reliability of the continuous operation of the scale mechanism 2 and preventing the depth measuring scale 3 from easily slipping off the guide wheel when it is rewinding at high speed or under uneven force, thus preventing it from getting caught inside the scale mechanism 2 and causing a malfunction.

[0052] In another embodiment, the marker 1 includes a marker body 101 and a top cover 102. The bottom end of the marker body 101 has an outlet for the cable connection end of the depth measuring scale 3. The top end of the marker body 101 is open, and the top cover 102 is placed on the open end of the marker body 101. The top cover 102 is fixed to the marker body 101 with screws. The scale mechanism 2 is placed on the top of the marker body 1 chamber for easy maintenance.

[0053] The pile body 101 is made of high-strength composite material, which is made by mixing and pressing glass fiber and epoxy resin in a mass ratio of 3:1. The pile height is 80cm~120cm. The outer wall of the pile body 101 is provided with reinforcing ribs, and four reinforcing ribs are evenly distributed along the circumference of the pile body to enhance the bending resistance and settlement resistance of the pile body 101.

[0054] The top cover 102 has an observation window 7 at its center to ensure that the observation window 7 can accurately read the readings on the depth measuring scale 3.

[0055] The top cover 102 is made of the same high-strength composite material as the pile body 101. The top of the top cover 102 has a marking area except for the observation window 7. The marking area is printed with the words "direct buried cable marker" and warning patterns. The surface of the marking area is covered with reflective film to ensure that construction personnel can quickly identify the location of the marker 1 at night or in low light conditions. The connection between the top cover 102 and the pile body 101 is equipped with a sealing ring. The sealing ring is made of nitrile rubber, which can effectively prevent rainwater and mud from entering the interior of the marker 1 and protect the ruler mechanism 2 from damage.

[0056] A second aspect of this application provides a method for monitoring the burial depth of directly buried cable markers based on any of the above-mentioned visible burial depths, comprising the following steps: During installation, the cable connection end of the depth measuring ruler 3 is fixed to the cable. As the backfill soil increases, the stake 1 is lifted, and the depth measuring ruler 3 extends out of the ruler mechanism 2 under the traction force of the cable fixing end. After the backfill is completed, the winding force of the automatic winding mechanism straightens the depth measuring ruler 3, and the scale reading at this time is the current burial depth. When soil settlement occurs, stake 1 sinks with the soil, and the automatic rewinding mechanism retracts the excess depth measuring rod 3. The reading at this time is the burial depth after settlement.

[0057] The direct-buried cable markers with visible burial depth proposed in this application have the advantages of simple structure, reliable device and firm installation, solving the difficulties and pain points of existing direct-buried cables in accurately and simply grasping the burial depth data.

[0058] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A visual depth of direct buried cable marker, characterized by, The utility model relates to a kind of direct-buried cable pegs, including: Stake (1), the stake (1) is hollow in the inside chamber is formed; Ruler mechanism (2), the ruler mechanism (2) is set in the chamber, with the stake (1) detachable connection;The ruler mechanism (2) includes automatic winding mechanism installed in its inner cavity; Depth gauge (3), the depth gauge (3) includes cable connection end and telescopic end, the cable connection end of the depth gauge (3) is connected with cable, the telescopic end of the depth gauge (3) is inserted into the inside of the ruler mechanism (2) and is connected with the automatic winding mechanism.

2. The visual depth of burial direct-buried cable marker of claim 1, wherein, The stake (1) top is provided with observation window (7), the scale value of the depth gauge (3) is read through the observation window (7).

3. The visual depth of burial direct-buried cable marker stake of claim 1, wherein, The automatic winding mechanism includes spring winding shaft (201), spring (202) and ruler spool (203), the both ends of the spring winding shaft (201) are provided with the stake connecting block (204), the spring winding shaft (201) is fixed on the inside wall of the ruler mechanism (2) by the stake connecting block (204), the ruler spool (203) is sleeved on the stake connecting block (204), and is positioned by its shaft shoulder, so that the ruler spool (203) and the spring winding shaft form spring installation cavity, the spring (202) is sleeved on the spring winding shaft (201), and is located in the spring installation cavity, the inner end of the spring (202) is fixed with the spring winding shaft (201), the outer end of the spring (202) is clamped on the outside wall of the ruler spool (203), and the telescopic end of the depth gauge (3) is connected with the ruler spool (203).

4. The visual depth of burial direct-buried cable marker stake of claim 3, wherein, The spring coefficient of the spring is 5N / mm~8N / mm, so that the depth gauge (3) can be reliably retracted by the spring in the natural state, and can also maintain the straight state under the gravity of the cable and the soil pressure.

5. The visual depth of burial direct-buried cable marker stake of claim 1, wherein, The direct-buried cable peg further includes a quick-release locking structure, the quick-release locking structure includes a locking block (6) disposed on a side wall of the ruler mechanism (2) and a clamping groove (5) disposed on a side wall of the stake (1), or a clamping groove (5) disposed on a side wall of the ruler mechanism (2) and a locking block (6) disposed on a side wall of the stake (1), the locking block (6) is at least partially clamped into the clamping groove (5), so that the ruler mechanism (2) is installed on the stake (1).

6. The visual depth of burial direct-buried cable marker stake of claim 1, wherein, The cable connection end of the depth gauge (3) is provided with a diversified adaptive interface, when a binding fixing method is used, the cable connection end is provided with a ring-shaped buckle for penetrating a binding belt, when a hoop (4) fixing method is used, the cable connection end is provided with a hoop (4), the hoop (4) is an adjustable hoop (4) composed of at least two arc-shaped clamping pieces and an adjusting bolt, one end of the two arc-shaped clamping pieces is rotatably connected, and the other end is connected through the adjusting bolt.

7. The visual depth of burial direct-buried cable marker stake of claim 1, wherein, The direct-buried cable peg further includes a guide assembly disposed in the chamber of the stake (1) and located directly below the ruler mechanism (2), the guide assembly includes at least one pair of guide wheels, and the depth gauge (3) passes between the pair of guide wheels.

8. The visual depth of burial direct-buried cable marker stake of claim 7, wherein, The rim of the guide wheel is provided with an annular limiting groove matching the thickness of the depth gauge (3) for guiding and limiting the extension and contraction of the depth gauge (3).

9. The visual depth of burial direct-buried cable marker stake of claim 1, wherein, The stake (1) comprises a stake body (101) and a top cover (102), the bottom end of the stake body (101) is provided with an outlet for the cable connecting end of the depth gauge (3) to extend out, the top end of the stake body (101) is an open end, and the top cover (102) is arranged on the open end of the stake body (101).

10. A method of monitoring the depth of a direct-buried cable marker according to any one of claims 1 to 9, wherein The method comprises the following steps: During installation, the cable connecting end of the depth gauge (3) is fixed on the cable, as the backfilling soil increases, the stake (1) is lifted, and the depth gauge (3) is extended from the gauge mechanism (2) under the traction of the fixed end of the cable; after the backfilling is completed, the winding force of the automatic winding mechanism makes the depth gauge (3) straight, and the scale read at this time is the current burial depth; When soil settlement occurs, the stake (1) sinks with the soil, the automatic winding mechanism retracts the excess depth gauge (3), and the scale read at this time is the burial depth after settlement.

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