Fiber optic cable ground laying fiber protection device

Abstract

This invention relates to a fiber optic cable ground-laying protection device. It solves the problem of poor protection effect of existing fiber optic protective sleeves. It includes a protective outer tube, with a protective inner tube for loading the optical fiber located circumferentially inside the outer tube. A support gap exists between the inner and outer tubes. Within the support gap are several elastic pressure-relieving mechanisms, each with one end fixed to the inner wall of the outer tube and the other end connected to the inner tube via a plug-in connection assembly. Furthermore, several pressure-resistant and shock-absorbing components are spirally arranged along the outer wall of the outer tube. A pressure transmission mechanism is located between adjacent pressure-resistant and shock-absorbing components on the outer wall of the outer tube. The advantages of this invention are: good protection effect, effectively reducing damage to the optical fiber from external pressure.

Description

Technical Field

[0001] This invention relates to the field of optical fiber protection technology, specifically to an optical fiber protection device for ground-laid optical cables. Background Technology

[0002] Optical fiber, short for optical waveguide fiber, is a type of fiber made of glass or plastic used as a means of light transmission. Due to its unique advantages such as strong resistance to chemical corrosion, good electrical insulation, small size, light weight, strong adaptability, and low cost, optical fiber is widely used in various engineering fields. Laying optical cables is the first and crucial step in engineering applications, making the protection of the optical fiber cable during the laying process paramount. Currently, most optical cable ground laying sites rely on manual alignment, placing the cable in pre-drilled slots filled with bricks, and then compacting the bricks to the ground from above. Existing optical fibers typically require protective sleeves during laying; however, these sleeves are inconvenient to install and remove quickly after connection, making them difficult to use. Furthermore, in some special optical fiber ground laying sites, the fiber inevitably encounters excessive vertical pressure, rendering the protective sleeves insufficient. Moreover, the fiber itself is too fragile and easily breaks, and under significant stress, it is prone to damage, affecting communication and resulting in poor protection.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a fiber optic communication power protection sleeve [CN201920917648.3], which includes a tube body, a connecting flange, a fixed flange, a fixing rod, and a fixing device. The connecting flange and the fixed flange are fixedly installed on both sides of the tube body, respectively. Four fixing rails are provided on one side of the fixed flange. Two first slide rails are provided at the top and bottom of one side of the fixed flange, and two second slide rails are provided at the top and bottom of the fixed flange, respectively. Four fixing rods are provided on one side of the connecting flange. Two fixing devices are fixedly installed at the top and bottom of one side of the fixed flange, respectively. The fixing device includes a fixing block, a snap-fit ​​spring, and a push rod. Two fixing blocks are respectively arranged in the two fixing rails.

[0004] The above solution has solved to some extent the problem that the fiber optic protective sleeve is not easy to flexibly disassemble and assemble after connection, and is inconvenient to use. However, the solution still has many shortcomings. For example, the protective sleeve is difficult to withstand the vertical pressure in special application scenarios, and the optical fiber itself is too fragile and easily broken. The optical fiber is easily damaged by large pressure, which affects communication and results in poor protection. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed and effective optical fiber protection device for ground-laid optical cables.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This optical fiber protection device for ground-laid optical cables includes a protective outer tube, an inner protective tube for loading optical fibers located on the inner circumferential side of the outer protective tube, and a support gap between the inner and outer protective tubes. Within the support gap are several elastic pressure-relieving mechanisms, one end of which is fixedly connected to the inner circumferential wall of the outer protective tube, and the other end of which is connected to the inner protective tube via a plug-in connection assembly. The outer circumferential wall of the outer protective tube is provided with several pressure-resistant and shock-absorbing components arranged spirally along its outer wall. A pressure transmission mechanism is located between adjacent pressure-resistant and shock-absorbing components on the outer wall of the outer protective tube. By separately setting up a protective inner tube and an outer protective tube on the outside of the optical fiber, and by setting up elastic pressure-relieving mechanisms between the outer and inner protective tubes to offset strong external pressure, while simultaneously setting up pressure-resistant and shock-absorbing components on the outer wall of the outer protective tube to alleviate stacking pressure, and utilizing the pressure transmission mechanism to conduct and disperse vertical pressure circumferentially, the internal optical fiber is prevented from being directly subjected to force, resulting in good protection and effective protection of the optical fiber.

[0007] In the aforementioned fiber optic cable ground-laying protection device, three elastic pressure-relieving mechanisms are equidistantly distributed along the circumferential direction of the support gap. A filling plug-in gap is provided between adjacent elastic pressure-relieving mechanisms. Both ends of the protective outer tube are sealed by plug-in connecting covers, and several protective outer tubes are connected end-to-end through plug-in connecting covers to form a fiber optic protection pipeline. This arrangement provides effective support, and the plug-in connecting covers ensure a seamless seal between each protective outer tube and the protective inner tube, effectively preventing rainwater intrusion.

[0008] In the aforementioned fiber optic cable ground-laying fiber protection device, the elastic pressure-relieving mechanism includes a pressure-relieving rubber. The pressure-relieving rubber has concave grooves on both sides facing the inner wall, forming arc-shaped pressure grooves. The inner side of the pressure-relieving rubber has several top-pressure buffer grooves arranged along the axial direction of the rubber and with an elliptical cross-section. Rigid support blocks are filled within these top-pressure buffer grooves, and the volume of the top-pressure buffer grooves gradually decreases from the outer protective tube to the inner protective tube. The volume of the rigid support blocks changes synchronously with the volume of the top-pressure buffer grooves. The top-pressure buffer grooves are horizontally arranged from top to bottom within the pressure-relieving rubber, with an elastic reset gap between adjacent grooves. A snap-fit ​​connection structure is provided at the end of the pressure-relieving rubber away from the outer protective tube. The elastic pressure-relieving mechanism can withstand greater pressure, reducing the force transmitted to the optical fiber, thus achieving a protective effect. Furthermore, the rigid support blocks provide better support for the pressure-relieving rubber, preventing damage to the inner protective tube and further increasing the load-bearing capacity.

[0009] In the aforementioned fiber optic cable ground-laying protection device, the snap-fit ​​connection structure includes an arc-shaped snap-fit ​​part with an arc-shaped snap-fit ​​groove. The arc-shaped snap-fit ​​groove has an insertion opening, and the ends of two adjacent arc-shaped snap-fit ​​parts are connected by a protective sleeve located on the outer circumference of the inner protective tube. The protective sleeve is made of flexible material and has connecting grooves at both ends. The snap-fit ​​connection structure makes the installation and removal of the inner protective tube more convenient.

[0010] In the aforementioned optical fiber protection device for ground-laid optical cables, the plug-in connection assembly includes a connection groove set on the protective outer tube, a connecting slider arranged in an arc shape in the connection groove, and a sliding plug part connected to the connecting slider and inserted into the arc-shaped snap-fit ​​groove. The sliding plug part and the connecting slider are connected by a fixed connection part, and the fixed connection part is set at the plug opening and there is an adjustable gap between the fixed connection part and the plug opening. The sliding plug part, the fixed connection part and the connecting slider are integrally formed.

[0011] In the aforementioned fiber optic cable ground-laying protection device, the number of pressure-resistant and shock-absorbing components is at least three, and there is a pressure transmission gap between two adjacent pressure-resistant and shock-absorbing components. The pressure transmission mechanism is set within the pressure transmission gap, and the pressure-resistant and shock-absorbing components have connecting slots on both sides for connecting the pressure transmission mechanism. The pressure transmission gap is not subjected to vertical pressure, and can realize the transmission of force to the pressure-resistant and shock-absorbing components, thus dispersing the force.

[0012] In the aforementioned fiber optic cable ground-laying protection device, the pressure-resistant and shock-absorbing component includes an arc-shaped pressure-resistant and shock-absorbing block disposed on the outer wall of the protective outer tube. The outer wall of the pressure-resistant and shock-absorbing block has a flexible outer structural layer, and the inner wall of the pressure-resistant and shock-absorbing block has an elastic shock-absorbing inner layer that fits tightly against the outer wall of the protective outer tube. There is a shock-absorbing gap between the elastic shock-absorbing inner layer and the flexible outer structural layer, and a sliding top-pressure structure is provided within the shock-absorbing gap. The pressure-resistant and shock-absorbing component can effectively relieve external pressure and provide initial support and top pressure.

[0013] In the aforementioned optical fiber protection device for ground-laid optical cables, the sliding top-pressure structure includes fixed sealing parts at both ends of the pressure-resistant and shock-absorbing block. The upper end of the fixed sealing part, facing the outer layer of the flexible structure, has a buffer groove. Both ends of the outer layer of the flexible structure have sliding connecting blocks slidably disposed within the buffer grooves. A sliding connecting part is provided within the shock-absorbing gap, and both ends of the sliding connecting part are slidably disposed within limiting grooves located below the buffer grooves. Several elastic top-pressure parts are located on both sides of the sliding connecting part. The elastic top-pressure part on one side of the sliding connecting part is connected to the inner wall of the outer layer of the flexible structure, and the elastic top-pressure part on the other side of the sliding connecting part is connected to the outer wall of the elastic shock-absorbing inner layer. The sliding top-pressure structure can provide a buffering force, avoiding damage caused by direct rigid contact with external pressure.

[0014] In the aforementioned fiber optic cable ground-laying fiber protection device, the pressure transmission mechanism includes a flexible pull plate made of rubber. Several orderly arranged air cushion columns are vertically positioned on both sides of the flexible pull plate, and each air cushion column has air holes. Flexible pull ropes are arranged in a matrix on both sides of the flexible pull plate, with the surface of the flexible pull ropes on the upper side of the flexible pull plate covered with a protective film. A waterproof layer is provided between the flexible pull ropes on the lower side of the flexible pull plate and the protective outer tube. The pressure transmission mechanism effectively protects against pressure transmission gaps while dispersing the force of the pressure-resistant and shock-absorbing components.

[0015] In the aforementioned fiber optic cable ground-laying fiber protection device, the plug-in connection cover includes an annular connection cover. The annular connection cover has several connection protrusions on both sides that correspond one-to-one with the connection slots. Plug-in connection parts are provided on the outer circumference of the connection protrusions, which are inserted into the filling plug-in gaps. The annular connection cover has a flexible adjustment part in the middle that can be bent arbitrarily. The flexible adjustment part facilitates bending during pipeline installation.

[0016] Compared with existing technologies, the advantages of this invention are: reasonable design, simple structure, easy to mass-produce and manufacture, and more convenient to assemble and disassemble. First, the external pressure is relieved by the pressure-resistant and shock-absorbing components set on the outer wall of the protective outer tube, and the pressure is dispersed by the pressure transmission mechanism. At the same time, the elastic pressure-relieving mechanism set between the protective outer tube and the protective inner tube effectively offsets part of the pressure transmitted to the inside, reducing the pressure damage of vertical pressure on the optical fiber in the protective inner tube, and the protection effect is good. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a partial structural cross-sectional view of the present invention;

[0019] Figure 3 This is a schematic diagram of the elastic pressure-relieving mechanism in this invention;

[0020] Figure 4 This is an exploded view of the pressure transmission mechanism in this invention;

[0021] Figure 5 This is a front view of the present invention;

[0022] Figure 6 This is a cross-sectional view of the anti-compression and shock-absorbing component in this invention;

[0023] Figure 7 This is a front view of the plug-in connection cover in this invention;

[0024] Figure 8 This is a side view of the plug-in connection cover in this invention.

[0025] In the diagram, the components are: 1. Protective outer tube; 2. Protective inner tube; 3. Support gap; 31. Filling insertion gap; 4. Insertion connection assembly; 41. Connecting slide; 42. Connecting slider; 43. Sliding insertion part; 44. Fixed connection part; 45. Adjustable gap; 5. Elastic pressure relief mechanism; 51. Pressure relief rubber; 52. Top pressure buffer groove; 53. Rigid support block; 54. Elastic reset gap; 55. Snap-fit ​​connection structure; 55. Arc-shaped snap-fit ​​part; 552. Arc-shaped snap-fit ​​groove; 553. Insertion opening; 554. Protective sleeve; 555. Connecting groove; 6. Pressure-resistant shock-absorbing assembly; and 7. Pressure transmission. 61. Gap, 63. Compression-resistant and shock-absorbing block, 64. Flexible outer structure, 65. Elastic shock-absorbing inner layer, 66. Shock-absorbing gap, 7. Pressure transmission mechanism, 71. Flexible pull plate, 72. Air cushion column, 73. Air hole, 74. Flexible pull rope, 75. Protective membrane, 76. Waterproof layer, 8. Sliding top pressure structure, 81. Fixed sealing part, 82. Buffer groove, 83. Sliding connecting block, 84. Sliding connecting part, 85. Limiting groove, 86. Elastic top pressure part, 9. Insertion connecting cover, 91. Annular connecting cover, 92. Connecting protrusion, 93. Insertion connecting part, 94. Flexible adjustment part. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-8 As shown, the optical fiber protection device for ground-laid optical cables includes a protective outer tube 1. A protective inner tube 2 for loading optical fibers is located on the inner circumference of the outer tube 1. A support gap 3 is provided between the inner tube 2 and the outer tube 1. Several elastic pressure-relieving mechanisms 5 are installed within the support gap 3, each with one end fixed to the inner circumference of the outer tube 1 and the other end connected to the inner tube 2 via a plug-in connection assembly 4. Several pressure-resistant and shock-absorbing components 6 are spirally arranged along the outer circumference of the outer tube 1. A pressure transmission mechanism 7 is provided between adjacent pressure-resistant and shock-absorbing components 6 located on the outer wall of the outer tube 1. The pressure-resistant and shock-absorbing components 6 on the outer wall of the outer tube 1 relieve external pressure, and the pressure transmission mechanism 7 disperses and transmits vertical pressure to other pressure-resistant and shock-absorbing components 6 that are not directly subjected to force. Simultaneously, the elastic pressure-relieving mechanisms 5 between the inner tube 2 and the outer tube 1 offset the pressure, reducing the stress on the inner tube 2, thereby effectively protecting the optical fibers located within the inner tube 2.

[0028] The elastic pressure-relieving mechanism 5 consists of three parts, equidistantly distributed along the circumference of the support gap 3. A filling insertion gap 31 is provided between adjacent elastic pressure-relieving mechanisms 5. Both ends of the protective outer tube 1 are sealed by insertion connecting caps 9, and several protective outer tubes 1 are connected end-to-end by insertion connecting caps 9 to form an optical fiber protective conduit. The filling insertion gap 31 is used to fill flexible rubber or rigid support strips to improve the pressure-reducing effect.

[0029] As can be seen, the elastic pressure-relieving mechanism 5 includes a pressure-relieving rubber 51. The pressure-relieving rubber 51 has concave arch-shaped pressure grooves on both sides facing the inner wall. Several pressure-relief grooves 52, arranged axially along the pressure-relieving rubber 51 and with elliptical cross-sections, are provided inside the pressure-relieving rubber 51. Rigid support blocks 53 are filled within the pressure-relief grooves 52. The volume of the pressure-relief grooves 52 gradually decreases from the outer protective tube 1 to the inner protective tube 2. The volume of the rigid support blocks 53 changes synchronously with the volume of the pressure-relief grooves 52. The pressure-relief grooves 52 are horizontally arranged from top to bottom within the pressure-relieving rubber 51, and there is an elastic reset gap 54 between adjacent grooves. A snap-fit ​​connection structure 55 is provided at the end of the pressure-relieving rubber 51 away from the outer protective tube 1. The rigid support blocks 53 within the pressure-relief grooves 52 enhance support, and the elastic reset gaps 54 allow the pressure-relieving rubber 51 to quickly reset, providing a pressure-relief force.

[0030] Furthermore, the snap-fit ​​connection structure 55 includes an arc-shaped snap-fit ​​portion 551, an arc-shaped snap-fit ​​groove 552 on the arc-shaped snap-fit ​​portion 551, and an insertion opening 553 on the arc-shaped snap-fit ​​groove 552. The ends of two adjacent arc-shaped snap-fit ​​portions 551 are connected by a protective sleeve 554 disposed around the outer periphery of the protective inner tube 2. The protective sleeve 554 is made of a flexible material and has a connecting groove 555. The connecting groove 555 is used to connect the connecting protrusion 92 on the insertion connecting cover 9, and the snap-fit ​​connection structure 55 facilitates the insertion and installation of the protective inner tube 2.

[0031] Obviously, the plug-in connection assembly 4 includes a connection groove 41 provided on the protective outer tube 1. The connection groove 41 is provided with an arc-shaped connection slider 42. The connection slider 42 is connected to a sliding plug part 43 that is plugged into the arc-shaped snap-fit ​​groove 552. The sliding plug part 43 and the connection slider 42 are connected by a fixed connection part 44. The fixed connection part 44 is provided at the plug-in opening 553 and there is an adjustable gap 45 between the fixed connection part 44 and the plug-in opening 553. The sliding plug part 43, the fixed connection part 44 and the connection slider 42 are integrally formed.

[0032] Specifically, the number of compression-resistant damping components 6 is at least three, and there is a pressure transmission gap 61 between two adjacent compression-resistant damping components 6. The pressure transmission mechanism 7 is disposed within the pressure transmission gap 61, and the compression-resistant damping components 6 have connecting slots on both sides for connecting the pressure transmission mechanism 7. The width of the pressure transmission gap 61 is smaller than the width of the compression-resistant damping components 6.

[0033] Furthermore, the pressure-resistant and shock-absorbing component 6 includes a pressure-resistant and shock-absorbing block 63 that is arc-shaped and disposed on the outer wall of the protective outer tube 1. The outer wall of the pressure-resistant and shock-absorbing block 63 has a flexible outer structure layer 64, and the inner wall of the pressure-resistant and shock-absorbing block 63 is provided with an elastic damping inner layer 65 that is tightly fitted to the outer wall of the protective outer tube 1. There is a damping gap 66 between the elastic damping inner layer 65 and the flexible outer structure layer 64, and a sliding top pressure structure 8 is provided in the damping gap 66.

[0034] More specifically, the sliding top-pressure structure 8 includes fixed sealing portions 81 disposed at both ends of the compression-resistant damping block 63. The fixed sealing portion 81 has a buffer groove 82 on its upper end facing the flexible outer layer 64. The flexible outer layer 64 has sliding connecting blocks 83 slidably disposed within the buffer grooves 82 at both ends. A sliding connecting portion 84 is disposed within the damping gap 66, and both ends of the sliding connecting portion 84 are slidably disposed within limiting grooves 85 located below the buffer grooves 82. The sliding connecting portion 84 has several elastic top-pressure portions 86 on both sides. The elastic top-pressure portion 86 on one side of the sliding connecting portion 84 is connected to the inner wall of the flexible outer layer 64, and the elastic top-pressure portion 86 on the other side of the sliding connecting portion 84 is connected to the outer wall of the elastic damping inner layer 65. The sliding connecting portion 84 and the elastic top-pressure portion 86 provide resistance to downward sliding of the flexible outer layer 64.

[0035] In detail, the pressure transmission mechanism 7 includes a flexible pull plate 71 made of rubber, with several orderly arranged air cushion columns 72 vertically arranged on both sides of the flexible pull plate 71, and air holes 73 on the air cushion columns 72. Flexible pull ropes 74 arranged in a matrix are provided on both sides of the flexible pull plate 71, and the surface of the flexible pull ropes 74 located on the upper side of the flexible pull plate 71 is covered with a protective film 75. A waterproof layer 76 is provided between the flexible pull ropes 74 located on the lower side of the flexible pull plate 71 and the protective outer tube 1. The pressure transmission mechanism 7 is mainly used to transmit the force on the vertically stressed anti-compression and shock-absorbing component 6 to the non-vertically stressed anti-compression and shock-absorbing component 6, thereby dispersing the vertical force.

[0036] Preferably, the plug-in connection cover 9 includes an annular connection cover 91. The annular connection cover 91 has several connection protrusions 92 on both sides that correspond one-to-one with the connection grooves 555. The connection protrusions 92 are provided with plug-in connection parts 93 that are inserted into the filling plug-in gap 31 on the outer side of the periphery. The annular connection cover 91 has a flexible adjustment part 94 that can be bent arbitrarily in the middle.

[0037] In summary, the principle of this embodiment is as follows: when subjected to a vertical force, the flexible outer layer 64 slides towards the sliding connection block 83. During the sliding process, the elastic top pressure part 86 provides resistance, and the pressure transmission mechanism 7 transmits the vertical force to the non-vertically subjected pressure-resistant and shock-absorbing component 6 to disperse the vertical force. At the same time, the pressure-relieving rubber 51 set between the protective outer tube 1 and the protective inner tube 2 reduces the vertical force, and the rigid support block 53 set in the top pressure buffer groove 52 provides support force, effectively preventing damage to the optical fiber located in the protective inner tube 2, resulting in good performance.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0039] Although this article extensively uses protective outer tube 1, protective inner tube 2, support gap 3, filling insertion gap 31, insertion connection assembly 4, connecting slide 41, connecting slider 42, sliding insertion part 43, fixed connection part 44, movable adjustment gap 45, elastic pressure relief mechanism 5, pressure relief rubber 51, top pressure buffer groove 52, rigid support block 53, elastic reset gap 54, snap-fit ​​connection structure 55, arc-shaped snap-fit ​​part 551, arc-shaped snap-fit ​​groove 552, insertion opening 553, protective sleeve 554, connecting groove 555, pressure-resistant and shock-absorbing assembly 6, pressure transmission gap 61, and anti- The terms used include: 63, shock-absorbing block; 64, flexible outer structure; 65, elastic shock-absorbing inner layer; 66, shock-absorbing gap; 7, pressure transmission mechanism; 71, flexible pull plate; 72, air cushion column; 73, air hole; 74, flexible pull rope; 75, protective membrane; 76, waterproof layer; 8, sliding top-pressure structure; 81, fixed sealing part; 82, buffer groove; 83, sliding connecting block; 84, sliding connecting part; 85, limiting groove; 86, elastic top-pressure part; 9, plug-in connecting cover; 91, annular connecting cover; 92, connecting protrusion; 93, plug-in connecting part; and 94, flexible adjustment part. However, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A fiber optic cable ground-laying fiber protection device, comprising a protective outer tube (1), wherein the protective outer tube (1) is provided with a protective inner tube (2) for loading optical fibers on its inner circumferential side, and a supporting gap (3) is provided between the protective inner tube (2) and the protective outer tube (1), characterized in that, The support gap (3) is provided with several elastic pressure relief mechanisms (5), one end of which is fixedly connected to the inner wall of the outer protective tube (1) and the other end is connected to the inner protective tube (2) through a plug-in connection assembly (4). The outer wall of the outer protective tube (1) is provided with several anti-pressure and shock-absorbing components (6) arranged in a spiral shape along the outer wall of the outer protective tube (1). Pressure transmission mechanism (7) is provided between two adjacent anti-pressure and shock-absorbing components (6) and on the outer wall of the outer protective tube (1). The elastic pressure relief mechanism (5) includes pressure relief rubber (51). The pressure relief rubber (51) has two sides that are concave towards the inner wall to form an arc-shaped pressure groove. (51) The inner side is provided with a plurality of top pressure buffer grooves (52) arranged along the axial direction of the pressure-relieving rubber (51) and having an elliptical cross section. The top pressure buffer grooves (52) are filled with rigid support blocks (53). The volume of the top pressure buffer grooves (52) gradually decreases from the outer protective tube (1) to the inner protective tube (2) in the circumferential direction. The volume of the rigid support blocks (53) changes synchronously with the volume of the top pressure buffer grooves (52). The top pressure buffer grooves (52) are arranged horizontally from top to bottom in the pressure-relieving rubber (51) and there is an elastic reset gap (54) between two adjacent ones. The pressure-relieving rubber (51) is far away from the outer protective tube. One end of the tube (1) is provided with a snap-fit ​​connection structure (55); the snap-fit ​​connection structure (55) includes an arc-shaped snap-fit ​​part (551), the arc-shaped snap-fit ​​part (551) is provided with an arc-shaped snap-fit ​​groove (552), the arc-shaped snap-fit ​​groove (552) is provided with an insertion opening (553), and the ends of two adjacent arc-shaped snap-fit ​​parts (551) are connected by a protective sleeve (554) provided on the outer periphery of the protective inner tube (2), the protective sleeve (554) is made of flexible material and is provided with a connecting groove (555); the insertion connection assembly (4) includes a component provided on the protective outer tube (1) The connecting slide groove (41) on the connecting slide groove (41) is provided with an arc-shaped connecting slider (42), and the connecting slider (42) is connected to a sliding plug part (43) inserted into the arc-shaped snap-fit ​​groove (552). The sliding plug part (43) and the connecting slider (42) are connected by a fixed connecting part (44), and the fixed connecting part (44) is provided at the plug opening (553) and there is an adjustable gap (45) between the fixed connecting part (44) and the plug opening (553). The sliding plug part (43), the fixed connecting part (44) and the connecting slider (42) are integrally formed.The pressure-resistant and shock-absorbing component (6) includes an arc-shaped pressure-resistant and shock-absorbing block (63) disposed on the outer wall of the protective outer tube (1). The outer wall of the pressure-resistant and shock-absorbing block (63) has a flexible outer structure layer (64), and the inner wall of the pressure-resistant and shock-absorbing block (63) is provided with an elastic damping inner layer (65) that is tightly fitted to the outer wall of the protective outer tube (1). There is a damping gap (66) between the elastic damping inner layer (65) and the flexible outer structure layer (64), and a sliding top pressure structure (8) is provided in the damping gap (66); the pressure transmission machine The structure (7) includes a flexible pull plate (71) made of rubber. Several orderly arranged air cushion columns (72) are vertically arranged on both sides of the flexible pull plate (71), and air holes (73) are provided on the air cushion columns (72). Flexible pull ropes (74) are arranged in a matrix on both sides of the flexible pull plate (71). The surface of the flexible pull ropes (74) located on the upper side of the flexible pull plate (71) is covered with a protective film (75). A waterproof layer (76) is provided between the flexible pull ropes (74) located on the lower side of the flexible pull plate (71) and the protective outer tube (1).

2. The optical fiber protection device for ground-laid optical cables according to claim 1, characterized in that, The number of elastic pressure relief mechanisms (5) is three and they are equidistantly distributed along the circumference of the support gap (3). A filling plug-in gap (31) is provided between two adjacent elastic pressure relief mechanisms (5). The two ends of the protective outer tube (1) are closed by plug-in connection cover (9), and several protective outer tubes (1) are connected end to end by plug-in connection cover (9) to form an optical fiber protection pipeline.

3. The optical fiber protection device for ground-laid optical cables according to claim 1, characterized in that, The number of the pressure-resistant damping components (6) is at least three, and there is a pressure transmission gap (61) between two adjacent pressure-resistant damping components (6). The pressure transmission mechanism (7) is set in the pressure transmission gap (61), and there are connection slots on both sides of the pressure-resistant damping components (6) for connecting the pressure transmission mechanism (7).

4. The optical fiber protection device for ground-laid optical cables according to claim 1, characterized in that, The sliding top-pressure structure (8) includes a fixed sealing part (81) provided at both ends of the anti-compression and shock-absorbing block (63). The fixed sealing part (81) has a buffer groove (82) on the upper end and the side facing the flexible structure outer layer (64). The flexible structure outer layer (64) has sliding connecting blocks (83) slidably disposed in the buffer groove (82) at both ends. The damping gap (66) is provided with a sliding connecting part (84). The sliding connecting part (84) is slidably disposed in the limiting groove (85) located below the buffer groove (82) at both ends. The sliding connecting part (84) has several elastic top-pressure parts (86) on both sides. The elastic top-pressure part (86) on one side of the sliding connecting part (84) is connected to the inner wall of the flexible structure outer layer (64). The elastic top-pressure part (86) on the other side of the sliding connecting part (84) is connected to the outer wall of the elastic damping inner layer (65).

5. The optical fiber protection device for ground-laid optical cables according to claim 2, characterized in that, The plug-in connection cover (9) includes an annular connection cover (91). The annular connection cover (91) has several connection protrusions (92) on both sides that correspond one-to-one with the connection groove (555). The connection protrusions (92) are provided with plug-in connection parts (93) that are inserted into the filling plug-in gap (31) on the outer side of the circumference. The annular connection cover (91) has a flexible adjustment part (94) that can be bent arbitrarily in the middle.

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