Distributed fiber cable installation hole-in-lay landfill method

Abstract

The application discloses a distributed optical fiber cable installation hole laying and filling method, which comprises the following steps: manufacturing a first section of optical fiber cable fixing assembly, fixing a branch optical fiber cable or two branch optical fiber cables on one side of the section of optical fiber cable fixing assembly; vertically placing the first section of optical fiber cable fixing assembly into a preformed installation hole and fixing the first section of optical fiber cable fixing assembly; then, successively manufacturing optical fiber cable fixing assembly branch optical fiber cable on the uppermost optical fiber cable fixing assembly upper end and conveying the optical fiber cable fixing assembly into the installation hole until a predetermined depth is reached; putting filler into the installation hole and tamping it to make the distributed optical fiber cable adhere to the hole wall of the installation hole. In the application, the optical fiber cable fixing assembly can not only protect the branch optical fiber cable, but also make the branch optical fiber cable adhere to the hole wall of the installation hole under the extrusion of the filler, so that the temperature measurement precision of the distributed optical fiber cable is improved.

Description

Technical Field

[0001] This invention belongs to the field of distributed optical fiber cable deployment, and in particular relates to a method for laying and burying distributed optical fiber cables inside installation holes. Background Technology

[0002] Distributed optical fiber is a type of optical fiber that serves as both a sensing element and a signal transmission medium. Sensing systems using distributed optical fiber can simultaneously utilize the optical fiber as both a sensing element and a signal transmission medium. Employing advanced OTDR technology, they can detect changes in temperature and strain at different locations along the optical fiber, achieving distributed measurement. This technology has been widely applied in various temperature measurement systems.

[0003] like Figure 1 As shown, the distributed optical fiber cable 200 is an optical cable using distributed optical fibers. When using the distributed optical fiber cable 200 to measure underground temperature, a vertical installation hole 300 is drilled beforehand. Then, the middle part of the distributed optical fiber cable 200 is bent into a "U" shape to form two branch optical fiber cables, branch optical fiber cable 210 and branch optical fiber cable 220. The "U"-shaped part 230 formed by bending the distributed optical fiber cable 200 is connected to the drill bit 400. Since the drill bit 400 is not removed after being inserted into the installation hole 300, but is buried together with the distributed optical fiber cable 200, a discarded drill bit 400 is generally used. The drill bit 400 is lowered into the installation hole 300 using equipment such as a winch 500, and gradually sinks, thereby lowering the two branch optical fiber cables into the installation hole 300. Figure 2 As shown, when the drill bit 400 reaches the bottom of the mounting hole 300, the wire rope 510 of the winch 500 is detached from the drill bit 400 and removed. Then, the mounting hole 300 is backfilled, and temperature measurement can be performed through the distributed optical fiber cable 200.

[0004] However, using the aforementioned fiber optic cable laying and burial method, it is difficult for the distributed fiber optic cable 200 to fit snugly against the wall of the mounting hole 300, which may lead to significant deviations in the measurement results. Furthermore, because the distributed fiber optic cable 200 is very thin, the above method cannot protect it during the burial process and is easily damaged, rendering it unusable. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a method for laying and burying distributed optical fiber cables in the installation holes.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A method for laying and burying distributed optical fiber cables inside installation holes includes the following steps:

[0008] S100. Fabricate the first fiber optic cable fixing assembly, and bend the middle part of the distributed fiber optic cable to form a "U" shape. Form two branch fiber optic cables at both ends of the "U" shape. Fix one branch fiber optic cable near the "U" shape to one side of the first fiber optic cable fixing assembly, or fix one or both branch fiber optic cables near the "U" shape to one side of the first fiber optic cable fixing assembly.

[0009] S200: The first fiber optic cable fixing assembly is inserted into the pre-formed mounting hole with one end of the "U"-shaped part of the corresponding distributed fiber optic cable facing down by the feeding mechanism, and the first fiber optic cable fixing assembly is fixed.

[0010] S300. Continue to manufacture a fiber optic cable fixing assembly at the upper end of the first fiber optic cable fixing assembly and fix it to the newly manufactured fiber optic cable fixing assembly. Straighten the branch fiber optic cable fixed to the fiber optic cable fixing assembly in the vertical direction for a while and then fix it to the newly manufactured fiber optic cable fixing assembly.

[0011] S400: The fiber optic cable fixing assembly is moved into the mounting hole by the feeding mechanism. The distance moved is equal to the length of a section of the fiber optic cable fixing assembly. Then, the uppermost section of the fiber optic cable fixing assembly is fixed.

[0012] S500, repeat steps S300 and S400, continue to make fiber optic cable fixing assembly fixing branch fiber optic cable at the uppermost fiber optic cable fixing assembly, and feed the fiber optic cable fixing assembly into the mounting hole until the "U" shaped part of the distributed fiber optic cable reaches the predetermined depth, then the feeding mechanism is withdrawn from the mounting hole.

[0013] S600. Place filler into the mounting hole and tamp it down so that the distributed optical fiber cable is tightly attached to the wall of the mounting hole.

[0014] Furthermore, step S100 includes the following sub-steps:

[0015] S110. Take a long strip of metal fixing bar, the metal fixing bar having a first side and a second side that are arranged opposite to each other, and fix a section of a branch optical fiber cable near the "U"-shaped part along the axial direction of the metal fixing bar to the first side of the metal fixing bar.

[0016] S120. Take an arc-shaped strip, attach the outer arc surface of the arc-shaped strip to the second side of the metal fixing strip, and align the axis of the arc-shaped strip with the axis of the metal fixing strip before fixing the metal fixing strip onto the arc-shaped strip.

[0017] S130. An abutment portion is provided on the second side of the metal fixing strip to form a first section of optical fiber cable fixing assembly; the length of the abutment portion is greater than or equal to the radius of the mounting hole and less than the diameter of the mounting hole.

[0018] Furthermore, the metal fixing strip has multiple small holes drilled in pairs, with equal spacing between adjacent pairs of holes; each pair of holes is symmetrically arranged on both sides of the axis of the metal fixing strip, and the spacing between the two holes is adapted to the diameter of the distributed optical fiber cable.

[0019] Furthermore, the method for fixing the distributed optical fiber cable to the first side of the metal fixing strip is as follows:

[0020] The distributed optical fiber cable is attached to the first side along the axis of the metal fixing strip, and a cable tie is used to bind and fix the distributed optical fiber cable to the metal fixing strip through two small holes at each pair of small holes.

[0021] Furthermore, the outer diameter of the arc-shaped strip is adapted to the inner diameter of the mounting hole; the length of the arc-shaped strip is equal to the length of the metal fixing strip, or the length of the arc-shaped strip is an integer multiple of the length of the metal fixing strip; when fixing the metal fixing strip to the arc-shaped strip, the second side of the metal fixing strip is attached to the outer arc surface of the arc-shaped strip, and the axis of the arc-shaped strip is aligned with the axis of the metal fixing strip, and then the metal fixing strip is firmly glued to the arc-shaped strip, or the metal fixing strip is screwed and fixed to the arc-shaped strip with a miniature double-ended flat bolt.

[0022] Furthermore, in step S120, one end of the metal fixing strip extends outward to the end face of the corresponding end of the arc-shaped strip to form a suspended section; in step S130, the suspended section is bent 90° toward the second side of the metal fixing strip to form an "L"-shaped structure, and the suspended section of the metal fixing strip forms an abutment part after bending.

[0023] Furthermore, the feeding mechanism is a drilling rig; step S200 includes the following sub-steps:

[0024] S210. A pulley is installed directly above the mounting hole. The steel wire rope wound on the winch or manual drum is connected to the pulley and then vertically downwards to be connected to the metal fixing strip of the first section of the optical fiber cable fixing assembly, thereby suspending the first section of the optical fiber cable fixing assembly.

[0025] S220, the drilling rig delivers the drill rod downwards, so that the drill bit of the drilling rig extends vertically downwards into the installation hole and abuts against the contact part of the first section of the optical fiber cable fixing assembly, and then pushes the first section of the optical fiber cable fixing assembly to move into the installation hole. At the same time, the winch or manual drum cooperates to release the steel wire rope downwards.

[0026] S230. When the moving distance reaches the predetermined distance, the drilling rig stops conveying the drill rod, locks the winch or manual drum, or uses a tool to clamp the metal fixing strip of the first fiber optic cable fixing assembly.

[0027] Furthermore, step S300 includes the following sub-steps:

[0028] S310. Take another long strip of metal fixing strip, place the metal fixing strip vertically on the upper end of the first fiber optic cable fixing assembly, and weld the lower end of the metal fixing strip to the upper end of the metal fixing strip of the first fiber optic cable fixing assembly.

[0029] S320. After straightening the next section of the distributed optical fiber cable in the vertical direction, fix it to the first side of the uppermost metal fixing strip.

[0030] S330. Take an arc-shaped strip, attach the outer arc surface of the arc-shaped strip to the second side of the uppermost metal fixing strip, and fix it after aligning the axis of the arc-shaped strip with the axis of the metal fixing strip to form another section of fiber optic cable fixing assembly.

[0031] Furthermore, in step S330, the arc-shaped strip and the metal fixing strip are offset by a certain distance in the vertical direction, so that the two ends of the arc-shaped strip are respectively connected to the two metal fixing strips.

[0032] Furthermore, in step S500, the filler is pre-made clay balls. When filling the mounting hole, a predetermined number of clay balls are placed into the mounting hole each time, and the clay balls are tamped by the drill bit of the drilling machine. Then, a predetermined number of clay balls are placed into the mounting hole and tamped by the drill bit until the mounting hole is filled.

[0033] In this invention, by fixing the branch optical fiber cable to the optical fiber cable fixing assembly, the filling material can compress the optical fiber cable fixing assembly against the wall of the mounting hole during burial, ensuring the branch optical fiber cable is tightly fitted to or even embedded in the hole wall. This achieves close contact between the distributed optical fiber cable and the ground, improving the temperature measurement accuracy of the distributed optical fiber cable. Furthermore, the optical fiber cable fixing assembly can protect the branch optical fiber cable, preventing it from being stretched, deformed, or damaged during deployment. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This is a schematic diagram of the existing technology for laying distributed optical fiber cables into mounting holes.

[0036] Figure 2 This is a schematic diagram of the completed distributed optical fiber cable deployment in the existing technology.

[0037] Figure 3 This is a flowchart of an embodiment of the distributed optical fiber cable installation hole laying and burying method of the present invention.

[0038] Figure 4 This is a front view of the first fiber optic cable fixing assembly when only one branch fiber optic cable is fixed.

[0039] Figure 5 The side view of the suspended section of the first fiber optic cable fixing assembly after bending to form the abutment part.

[0040] Figure 6 This is a cross-sectional schematic diagram of the fiber optic cable fixing assembly.

[0041] Figure 7 The front view of the first fiber optic cable fixing assembly when fixing two branch fiber optic cables.

[0042] Figure 8 This is a schematic diagram showing the vertical insertion of one end of the first fiber optic cable fixing assembly into the mounting hole.

[0043] Figure 9 This is a schematic diagram showing the connection of the two ends of the arc-shaped strip to two metal fixing strips.

[0044] Figure 10 This is a cross-sectional diagram showing the completed deployment of a distributed optical fiber cable when only one branch optical fiber cable is fixed.

[0045] Figure 11 A cross-sectional view of the distributed optical fiber cable after its deployment is completed, with two branch optical fiber cables in place.

[0046] The diagrams in the instruction manual are labeled as follows:

[0047] Fiber optic cable fixing assembly-100; metal fixing strip-110; abutment part-111; suspended section-111'; small hole-112; binding strap-121; miniature double-ended flat bolt-122; arc-shaped strip-150;

[0048] Distributed fiber optic cable - 200; Branch fiber optic cable - 210, 220; "U" shaped section - 230; Mounting hole - 300; Filler - 310; Drill bit - 400; Winch - 500; Wire rope - 510; Pulley - 520. Detailed Implementation

[0049] The following specific examples illustrate the implementation of the present invention. The illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0050] Please see Figure 3 , Figure 3This is a flowchart illustrating an embodiment of the distributed optical fiber cable installation hole laying and burying method of the present invention. The distributed optical fiber cable installation hole laying and burying method of this embodiment includes the following steps:

[0051] S100, please refer to Figure 4 , Figure 5 and Figure 6 The first fiber optic cable fixing assembly 100 is fabricated, and the middle part of the distributed fiber optic cable 200 is bent to form a "U"-shaped portion 230. Branch fiber optic cables 210 and 220 are formed at both ends of the "U"-shaped portion 230, and a section of the branch fiber optic cable 210 adjacent to the "U"-shaped portion 230 is fixed to one side of the first fiber optic cable fixing assembly 100. Since it is only necessary to keep one section of the distributed fiber optic cable 200 close to the wall of the mounting hole 300 to ensure the accuracy of temperature measurement, the branch fiber optic cable 220 does not need to be close to the wall, that is, it does not need to be fixed to the fiber optic cable fixing assembly 100. This step may include the following sub-steps:

[0052] S110. Take a long strip of metal fixing strip 110. The metal fixing strip 110 has a first side and a second side that are arranged opposite to each other. Fix a section of the branch optical fiber cable 210 near the "U"-shaped part 230 along the axial direction of the metal fixing strip 110 to the first side of the metal fixing strip 110. The metal fixing strip 110 can be a miniature flat steel with a length of 3m to 4.5m. Of course, other flat metal strips can also be used.

[0053] To facilitate the fixing of the distributed optical fiber cable 200, multiple small holes 112 can be pre-drilled on the metal fixing strip 110. These holes 112 are arranged in pairs, with equal spacing between adjacent pairs. Each pair of holes 112 is symmetrically arranged on both sides of the axis of the metal fixing strip 110, and the spacing between the two holes 112 is adapted to the diameter of the distributed optical fiber cable 200, so that the distributed optical fiber cable 200 can be secured to the metal fixing strip 110 using the binding strap 121.

[0054] The specific method for fixing the distributed optical fiber cable 200 is as follows: the distributed optical fiber cable 200 is attached to the first side along the axial direction of the metal fixing strip 110, and the distributed optical fiber cable 200 is tied and fixed to the metal fixing strip 110 by passing the binding strap 121 through the two small holes 112 at each pair of small holes 112.

[0055] S120. Take an arc-shaped strip 150, align the outer arc surface of the arc-shaped strip 150 with the second side of the metal fixing strip 110, and align the axis of the arc-shaped strip 150 with the axis of the metal fixing strip 110. Then fix the metal fixing strip 110 onto the arc-shaped strip 150 to form the first fiber optic cable fixing assembly 100. To ensure that the deployed distributed fiber optic cable 200 fits tightly against the wall of the mounting hole 300, the outer diameter D1 of the arc-shaped strip 150 can be approximately equal to the inner diameter D2 of the mounting hole 300.

[0056] In this embodiment, the length of the arc-shaped strip 150 is equal to the length of the metal fixing strip 110; of course, the length of the arc-shaped strip 150 can also be an integer multiple of the length of the metal fixing strip 110. The arc-shaped strip 150 can be obtained by cutting a PVC pipe whose outer diameter matches the inner diameter of the mounting hole 300 into four or six equal parts. That is, a PVC pipe whose outer diameter matches the inner diameter of the mounting hole 300 and whose length is equal to that of the metal fixing strip 110 can be cut into four parts to obtain four arc-shaped strips 150; or cut into six parts to obtain six arc-shaped strips 150.

[0057] When fixing the metal fixing strip 110 to the arc-shaped strip 150, the second side of the metal fixing strip 110 is fitted against the outer arc surface of the arc-shaped strip 150, and the axis of the arc-shaped strip 150 is aligned with the axis of the metal fixing strip 110. Then, the metal fixing strip 110 is screwed and fixed to the arc-shaped strip 150 using miniature double-ended flat bolts 122. Alternatively, the metal fixing strip 110 can be firmly glued to the arc-shaped strip 150.

[0058] Please see Figure 7 If both branch fiber optic cables are to be fixed on the fiber optic cable fixing assembly 100, the fiber optic cable fixing assembly 100 needs two metal fixing strips 110. First, fix the two branch fiber optic cables on the two metal fixing strips 110 respectively, and then fix the two metal fixing strips 110 together on the outer arc surface of the arc-shaped strip 150.

[0059] S130. An abutment portion 111 is provided on the second side of the metal fixing strip 110, thus completing the fabrication of the first fiber optic cable fixing assembly 100. The length L1 of the abutment portion 111 is greater than or equal to the radius of the mounting hole 300 (i.e., D2 / 2) and less than the diameter D2 of the mounting hole 300, preferably two-thirds of the diameter D2 of the mounting hole 300, i.e.: L1 = 2 * D2 / 3.

[0060] During the deployment of the distributed optical fiber cable 200, the optical fiber cable fixing assembly 100 can be stably delivered into the mounting hole 300 by the drill bit 400 of the drilling rig abutting part 111. Therefore, only the first section of the optical fiber cable fixing assembly 100 needs to have the abutting part 111 made, and subsequent optical fiber cable fixing assemblies 100 no longer need the abutting part 111.

[0061] Please continue reading. Figure 4 In this embodiment, in step S120, one end of the metal fixing strip 110 extends outward to the end face of the corresponding end of the arc-shaped strip 150 to form a suspended segment 111'. Please continue reading. Figure 5 In this step, the suspended section 111' is bent 90° toward the second side of the metal fixing strip 110 to form an "L" shape. After bending, the suspended section 111' of the metal fixing strip 110 forms the abutment part 111. Of course, other methods can also be used to form the abutment part 111. For example, an object of suitable size, such as an old drill bit 400, can be fixed to the second side of the metal fixing strip 110 by binding or other means, and the object can be used as the abutment part 111.

[0062] S200, please refer to Figure 8 The first fiber optic cable fixing assembly 100 is vertically inserted, with one end of the "U"-shaped portion 230 corresponding to the distributed fiber optic cable 200, into the pre-formed mounting hole 300 via a feeding mechanism, and the first fiber optic cable fixing assembly 100 is then fixed. The feeding mechanism can be a drilling rig. This step may include the following sub-steps:

[0063] S210. A pulley 520 is set directly above the mounting hole 300. The wire rope 510 wound on the winch 500 or manual drum is connected to the pulley 520 and then vertically downwards to be connected to the metal fixing strip 110 of the first fiber optic cable fixing assembly 100, thereby suspending the first fiber optic cable fixing assembly 100.

[0064] S220, the drilling rig delivers the drill rod downwards, so that the drill bit 400 of the drilling rig extends vertically downwards into the installation hole 300 and abuts against the contact part 111 of the first section of optical fiber cable fixing assembly 100, and pushes the first section of optical fiber cable fixing assembly 100 into the installation hole 300. At the same time, the winch 500 or the manual drum cooperates to release the steel wire rope 510 downwards.

[0065] S230. When the moving distance reaches the predetermined distance, the drilling rig stops conveying the drill rod and locks the winch 500 or the manual drum, thereby suspending the metal fixing strip 110 of the first fiber optic cable fixing assembly 100 so that it no longer moves; alternatively, a tool can be used to clamp the metal fixing strip 110 of the first fiber optic cable fixing assembly 100 to prevent the first fiber optic cable fixing assembly 100 from moving.

[0066] S300: Continue fabricating another section of fiber optic cable fixing assembly 100 at the upper end of the first section of fiber optic cable fixing assembly 100, and then straighten the branch fiber optic cable fixed to the fiber optic cable fixing assembly 100 in the vertical direction for a section before fixing it to the newly fabricated fiber optic cable fixing assembly 100. This step may include the following sub-steps:

[0067] S310. Take a long strip of metal fixing strip 110 and place the metal fixing strip 110 vertically on the upper end of the first fiber optic cable fixing assembly to prevent the metal fixing strip 110 from being tilted; and weld the lower end of the metal fixing strip 110 to the upper end of the metal fixing strip 110 of the first fiber optic cable fixing assembly 100.

[0068] S320. After straightening the next section of the distributed optical fiber cable 200 in the vertical direction, fix it to the first side of the uppermost metal fixing strip 110.

[0069] S330. Take an arc-shaped strip 150, attach the outer arc surface of the arc-shaped strip 150 to the second side of the uppermost metal fixing strip 110, and fix it after aligning the axis of the arc-shaped strip 150 with the axis of the metal fixing strip 110 to form another section of fiber optic cable fixing assembly 100.

[0070] Please see Figure 9 To facilitate the connection between the fiber optic cable fixing assemblies 100, in this step, the arc-shaped strip 150 and the metal fixing strip 110 are generally offset by a certain distance in the vertical direction, so that the two ends of the arc-shaped strip 150 are respectively connected to the two metal fixing strips 110. Of course, please continue to refer to Figure 4 In step S120, the arc-shaped strip 150 and the metal fixing strip 110 can also be offset by a certain distance in the vertical direction; the offset distance between the arc-shaped strip 150 and the metal fixing strip 110 can be equal to the length L1 of the abutment portion 111, so that the offset distance of the first metal fixing strip 110 just forms the suspended segment 111'.

[0071] S400: The fiber optic cable fixing assembly 100 is moved into the mounting hole 300 by the feeding mechanism. The distance moved is equal to the length of a section of the fiber optic cable fixing assembly 100. Then, the uppermost section of the fiber optic cable fixing assembly 100 is fixed. For specific methods, please refer to step S200.

[0072] S500, repeat steps S300 and S400, continue to manufacture the fiber optic cable fixing assembly 100 fixing branch fiber optic cable at the uppermost fiber optic cable fixing assembly 100, and continue to deliver the fiber optic cable fixing assembly 100 into the mounting hole 300 by the drilling rig until the "U" shaped part 230 of the distributed fiber optic cable 200 reaches the predetermined depth, then remove the drill rod and drill bit 400 of the drilling rig from the mounting hole 300.

[0073] S600: Filler 310 is placed into the mounting hole 300 and compacted to ensure the distributed optical fiber cable 200 is tightly attached to the hole wall of the mounting hole 300. In this embodiment, clay balls are prefabricated as filler 310. When placing filler 310 into the mounting hole 300, a predetermined number of clay balls (e.g., the number of clay balls required for a burial depth of 1m) are placed into the mounting hole 300 each time. Then, the clay balls are compacted by the conical drill bit 400 of the drilling rig, thereby squeezing the arc-shaped strip 150 outward through the clay balls, so that the outer arc surface of the arc-shaped strip 150 is attached to the hole wall of the mounting hole 300. After that, clay balls required for a burial depth of 1m are continuously placed into the mounting hole 300 and compacted by the drill bit 400 until the mounting hole 300 is filled.

[0074] Please see Figure 10 When only branch fiber optic cable 210 is fixed to the fiber optic cable fixing assembly 100, after the distributed fiber optic cable 200 is laid, branch fiber optic cable 210 is flush against the wall of the mounting hole 300, while branch fiber optic cable 220 is not flush against the wall of the mounting hole 300. Please refer to [link / reference]. Figure 11 When both branch fiber optic cable 210 and branch fiber optic cable 220 are fixed to the fiber optic cable fixing assembly 100, after the distributed fiber optic cable 200 is laid, both branch fiber optic cable 210 and branch fiber optic cable 220 will be tightly attached to the wall of the mounting hole 300.

[0075] In this embodiment, the distributed optical fiber cable 200 is laid by fixing it to the optical fiber cable fixing assembly 100. During burial, the filling material 310 can compress the optical fiber cable fixing assembly 100 to adhere it to the wall of the mounting hole 300. This ensures that the branch optical fiber cable is tightly fitted to or even embedded in the wall of the mounting hole 300, thereby achieving close contact between the distributed optical fiber cable 200 and the ground and improving the temperature measurement accuracy of the distributed optical fiber cable 200. Furthermore, the optical fiber cable fixing assembly 100 can also protect the distributed optical fiber cable 200, preventing it from being stretched, deformed, or damaged during the laying process.

[0076] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A method for laying and burying distributed optical fiber cables inside installation holes, characterized in that, Includes the following steps: S100. Fabricate the first fiber optic cable fixing assembly, and bend the middle part of the distributed fiber optic cable to form a "U" shape. Form two branch fiber optic cables at both ends of the "U" shape. Fix one branch fiber optic cable near the "U" shape to one side of the first fiber optic cable fixing assembly, or fix one or both branch fiber optic cables near the "U" shape to one side of the first fiber optic cable fixing assembly. S200: The first fiber optic cable fixing assembly is inserted into the pre-formed mounting hole with one end of the "U"-shaped part of the corresponding distributed fiber optic cable facing down by the feeding mechanism, and the first fiber optic cable fixing assembly is fixed. S300. Continue to manufacture a fiber optic cable fixing assembly at the upper end of the first fiber optic cable fixing assembly and fix it to the newly manufactured fiber optic cable fixing assembly. Straighten the branch fiber optic cable fixed to the fiber optic cable fixing assembly in the vertical direction for a while and then fix it to the newly manufactured fiber optic cable fixing assembly. S400: The fiber optic cable fixing assembly is moved into the mounting hole by the feeding mechanism. The distance moved is equal to the length of a section of the fiber optic cable fixing assembly. Then, the uppermost section of the fiber optic cable fixing assembly is fixed. S500, repeat steps S300 and S400, continue to make fiber optic cable fixing assembly fixing branch fiber optic cable at the uppermost fiber optic cable fixing assembly, and feed the fiber optic cable fixing assembly into the mounting hole until the "U" shaped part of the distributed fiber optic cable reaches the predetermined depth, then the feeding mechanism is withdrawn from the mounting hole. S600. Place filler into the mounting hole and tamp it down so that the distributed optical fiber cable is tightly attached to the wall of the mounting hole.

2. The method for laying and burying distributed optical fiber cables inside installation holes as described in claim 1, characterized in that, Step S100 includes the following sub-steps: S110. Take a long strip of metal fixing bar, the metal fixing bar having a first side and a second side that are arranged opposite to each other, and fix a section of a branch optical fiber cable near the "U"-shaped part along the axial direction of the metal fixing bar to the first side of the metal fixing bar. S120. Take an arc-shaped strip, attach the outer arc surface of the arc-shaped strip to the second side of the metal fixing strip, and align the axis of the arc-shaped strip with the axis of the metal fixing strip before fixing the metal fixing strip onto the arc-shaped strip. S130. An abutment portion is provided on the second side of the metal fixing strip to form a first section of optical fiber cable fixing assembly; the length of the abutment portion is greater than or equal to the radius of the mounting hole and less than the diameter of the mounting hole.

3. The method for laying and burying distributed optical fiber cables in installation holes as described in claim 2, characterized in that: The metal fixing strip has multiple small holes drilled in pairs, with equal spacing between adjacent pairs of holes; each pair of holes is symmetrically arranged on both sides of the axis of the metal fixing strip, and the spacing between the two holes is adapted to the diameter of the distributed optical fiber cable.

4. The method for laying and burying distributed optical fiber cables in installation holes as described in claim 3, characterized in that, The method for fixing the distributed optical fiber cable to the first side of the metal fixing strip is as follows: The distributed optical fiber cable is attached to the first side along the axis of the metal fixing strip, and a cable tie is used to bind and fix the distributed optical fiber cable to the metal fixing strip through two small holes at each pair of small holes.

5. The method for laying and burying distributed optical fiber cables in installation holes as described in claim 2, characterized in that: The outer diameter of the arc-shaped strip is adapted to the inner diameter of the mounting hole; the length of the arc-shaped strip is equal to the length of the metal fixing strip, or the length of the arc-shaped strip is an integer multiple of the length of the metal fixing strip; when fixing the metal fixing strip to the arc-shaped strip, the second side of the metal fixing strip is attached to the outer arc surface of the arc-shaped strip, and the axis of the arc-shaped strip is aligned with the axis of the metal fixing strip, and then the metal fixing strip is firmly glued to the arc-shaped strip, or the metal fixing strip is screwed and fixed to the arc-shaped strip with a miniature double-ended flat bolt.

6. The method for laying and burying distributed optical fiber cables in installation holes as described in claim 2, characterized in that: In step S120, one end of the metal fixing strip extends outward to the end face of the corresponding arc-shaped strip to form a suspended section; in step S130, the suspended section is bent 90° toward the second side of the metal fixing strip to form an "L"-shaped structure, and the suspended section of the metal fixing strip forms an abutment part after bending.

7. The method for laying and burying distributed optical fiber cables in installation holes as described in claims 2 to 6, characterized in that, The feeding mechanism is a drilling rig; step S200 includes the following sub-steps: S210. A pulley is installed directly above the mounting hole. The steel wire rope wound on the winch or manual drum is connected to the pulley and then vertically downwards to be connected to the metal fixing strip of the first section of the optical fiber cable fixing assembly, thereby suspending the first section of the optical fiber cable fixing assembly. S220, the drilling rig delivers the drill rod downwards, so that the drill bit of the drilling rig extends vertically downwards into the installation hole and abuts against the contact part of the first section of the optical fiber cable fixing assembly, and then pushes the first section of the optical fiber cable fixing assembly to move into the installation hole. At the same time, the winch or manual drum cooperates to release the steel wire rope downwards. S230. When the moving distance reaches the predetermined distance, the drilling rig stops conveying the drill rod, locks the winch or manual drum, or uses a tool to clamp the metal fixing strip of the first fiber optic cable fixing assembly.

8. The method for laying and burying distributed optical fiber cables in installation holes as described in claims 1 to 6, characterized in that, The S300 step includes the following sub-steps: S310. Take another long strip of metal fixing strip, place the metal fixing strip vertically on the upper end of the first fiber optic cable fixing assembly, and weld the lower end of the metal fixing strip to the upper end of the metal fixing strip of the first fiber optic cable fixing assembly. S320. After straightening the next section of the distributed optical fiber cable in the vertical direction, fix it to the first side of the uppermost metal fixing strip. S330. Take an arc-shaped strip, attach the outer arc surface of the arc-shaped strip to the second side of the uppermost metal fixing strip, and fix it after aligning the axis of the arc-shaped strip with the axis of the metal fixing strip to form another section of fiber optic cable fixing assembly.

9. The method for laying and burying distributed optical fiber cables in installation holes as described in claim 8, characterized in that: In step S330, the arc-shaped strip and the metal fixing strip are offset by a certain distance in the vertical direction, so that the two ends of the arc-shaped strip are respectively connected to the two metal fixing strips.

10. The method for laying and burying distributed optical fiber cables in installation holes as described in claim 1, characterized in that: In step S500, the filler is pre-made clay balls. When filling the mounting hole, a predetermined number of clay balls are placed into the mounting hole each time, and the clay balls are tamped by the drill bit of the drilling machine. Then, a predetermined number of clay balls are placed into the mounting hole and tamped by the drill bit until the mounting hole is filled.

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