Helical fiber optic cable layout components for geophysical exploration

Abstract

The present invention discloses a laying assembly for a spiral optical cable for geophysical exploration. The laying assembly includes a fixing frame, on which a clamp is fixedly provided for fixing and supporting the optical cable; a long rod is slidably provided on the fixing frame for pushing soil under the optical cable when the optical cable is buried; a lifting block is slidably provided on the fixing frame, a protrusion is fixedly provided on the long rod, and an inclined groove is provided on the lifting block, in which the protrusion is slidably provided. When the optical cable is buried and the cable trench is filled with soil, the long rod is slid to push the soil between the long rod and the optical cable to under the optical cable, thereby preventing the phenomenon that the area under the optical cable is difficult to fill due to the circular cross-section of the optical cable during the filling operation, thereby improving the stability of the optical cable during laying.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber cables, and in particular to a spiral optical cable for geophysical exploration. Background Art

[0002] The application of distributed spiral optical cables in geophysical exploration mainly relies on their efficient signal transmission and precise positioning functions in underground detection. It combines fiber optic sensing technology with the needs of geophysical exploration and is suitable for scenarios such as geological exploration, resource detection, underground structure analysis, and earthquake monitoring.

[0003] The tensile strength of a spiral optical cable refers to the ability of the optical fiber to maintain its structural integrity and transmission performance when subjected to tensile forces (such as during installation or operation). The tensile strength of spiral optical cables in existing technologies needs to be improved during installation and use. In particular, during the installation process, parameters such as the tension and bending radius of the optical cable need to be strictly controlled. Otherwise, the performance of the optical cable may be degraded or damaged. Summary of the Invention

[0004] The object of the present invention is to provide a spiral optical cable for geophysical exploration to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A spiral optical cable for geophysical exploration, comprising an outer sheath and an inner sheath, wherein the outer sheath is coated on the outer surface of the inner sheath, and a plurality of spiral optical fibers are arranged between the outer sheath and the inner sheath, wherein the spiral angles of the plurality of spiral optical fibers are all between 20° and 70°;

[0007] It also includes a steel wire armor layer, the inner protective layer is coated on the outer surface of the steel wire armor layer, and the steel wire armor layer is two layers of double alloy coated steel wire spiral armor in opposite directions;

[0008] Also included is a laying component for laying the optical cable.

[0009] Preferably, it further comprises a sensing optical fiber, a stainless steel tube is provided on the outside of the sensing optical fiber, a steel wire armor layer is provided on the outside of the stainless steel tube, and the sensing optical fiber is composed of single-mode and multi-mode optical fibers.

[0010] Preferably, the laying assembly includes a fixing frame, on which a clamp is fixedly provided for fixing and supporting the optical cable;

[0011] A long rod is slidably provided on the fixing frame, which is used to push the soil under the optical cable when the optical cable is buried;

[0012] A lifting block is slidably provided on the fixing frame, a convex block is fixedly provided on the long rod, an inclined groove is provided on the lifting block, and the convex block is slidably provided in the inclined groove.

[0013] Preferably, a threaded block is fixedly provided on the lifting block, a vertical pipe is threadedly connected to the threaded block, a locking ring is fixedly provided on the vertical pipe, a locking piece is slidably provided on the fixing frame, and the locking piece is used to limit the locking ring.

[0014] Preferably, a pressure plate is slidably provided on the fixed frame, a rotating tube is rotatably provided on the pressure plate, the rotating tube is slidably connected to the vertical tube, and a first spring is provided between the rotating block and the vertical tube, and the two ends of the first spring are fixedly connected to the rotating tube and the vertical tube respectively.

[0015] Preferably, a rotating pin is rotatably provided on the fixing member, and the rotating pin is slidably connected to the rotating tube.

[0016] Preferably, a second spring is provided between the locking member and the fixing frame, and two ends of the second spring are fixedly connected to the locking member and the fixing frame respectively.

[0017] Preferably, a limit pin is further included, and a limit slot is provided on the long rod, and the limit pin passes through the fixing frame and is slidably plugged into the limit slot.

[0018] Preferably, an adaption groove is provided on the long rod, and the adaption groove is adapted to the clamp.

[0019] In the above technical solution, the spiral optical cable for geophysical exploration provided by the present invention has the following beneficial effects:

[0020] 1. By spirally winding multiple single-mode bend-insensitive optical fibers at an angle of 20° to 70°, the propagation mode, polarization maintenance, phase control, and loss characteristics of the spiral optical fibers are guaranteed, and the spiral angles of the multiple spiral optical fibers are made consistent to optimize the performance of the optical cable. In addition, by setting the steel wire armor layer to be composed of two layers of ultra-high-strength double-alloy coated steel wire spiral armor in opposite directions, the stability of the optical cable during exploration operations is guaranteed.

[0021] 2. When laying the optical cable underground, when filling the cable trench, slide the long rod and push the soil between the long rod and the optical cable to the bottom of the optical cable to prevent the phenomenon that it is difficult to fill the bottom of the optical cable due to the circular cross-section of the optical cable during the filling operation, thereby improving the stability of the optical cable laying process.

[0022] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0023] This application document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the main structure of an optical cable provided in an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of the layout components provided in an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the lifting block and pressure plate structure provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the long rod structure provided by an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1. Outer sheath; 11. Helix angle; 12. Helical optical fiber; 13. Inner sheath; 14. Steel wire armor layer; 15. Stainless steel tube; 16. Sensing optical fiber; 2. Fixing frame; 21. Clamp; 3. Long rod; 31. Bump; 32. Adapter groove; 33. Limiting groove; 4. Lifting block; 41. Bevel groove; 42. Threaded block; 43. Vertical tube; 44. Locking ring; 5. Pressure plate; 51. Rotating tube; 52. First spring; 53. Rotating pin; 6. Locking piece; 61. Second spring; 7. Limiting pin. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0032] Please refer to 1-4, a spiral optical cable for geophysical exploration, comprising an outer sheath 1 and an inner sheath 13, wherein the outer sheath 1 is coated on the outer surface of the inner sheath 13, and a plurality of spiral optical fibers 12 are arranged between the outer sheath 1 and the inner sheath 13, and the spiral angles 11 of the plurality of spiral optical fibers 12 are all 20° to 70°; further comprising a steel wire armor layer 14, wherein the inner sheath 13 is coated on the outer surface of the steel wire armor layer 14, and the steel wire armor layer 14 is a double-alloy-coated steel wire spiral armor with two layers in opposite directions; further comprising a laying component, which is used to lay the optical cable, by spirally winding a plurality of single-mode bend-insensitive optical fibers at an angle between 20° and 70°, so as to ensure that the spiral optical fibers 12 have a light propagation mode, polarization maintenance, Phase control and loss characteristics are generally adjusted through actual application of the helix angle 11, and the helix angles 11 of multiple spiral optical fibers 12 are consistent to optimize the performance of the optical cable, and by setting the steel wire armor layer 14 to be composed of two layers of ultra-high strength double-alloy coated steel wire spiral armor in opposite directions; the tensile strength of a single steel wire is greater than 2160MPa, which can ensure the stability of the optical cable during laying and exploration operations. The outer sheath 1 and the inner sheath 13 are made of thermoplastic materials such as ETFE\PP\PE to protect the spiral optical fiber 12. By arranging a laying component on the optical cable, the bottom of the optical cable can be filled and compacted when the optical cable is laid in the cable trench to ensure the stability of the optical cable after burial.

[0033] Specifically, it also includes a sensing optical fiber 16. A stainless steel tube 15 is provided on the outside of the sensing optical fiber 16. The outside of the stainless steel tube 15 is a steel wire armor layer 14. The stainless steel tube 15 is made of 316L material to protect the sensing optical fiber 16 in the tube from stress. The sensing optical fiber 16 is composed of single-mode and multi-mode optical fibers and is used to measure temperature, strain, sound waves, etc. A grating can be engraved on the sensing optical fiber 16 to increase the sensitivity of optical fiber measurement.

[0034] In an embodiment further provided by the present invention, the laying assembly includes a fixing frame 2, on which a clamp 21 is fixedly provided, which is used to fix and support the optical cable; a long rod 3 is slidably provided on the fixing frame 2, which is used to push the soil under the optical cable when the optical cable is buried; a lifting block 4 is slidably provided on the fixing frame 2, and a protrusion 31 is fixedly provided on the long rod 3. The lifting block 4 is provided with an inclined groove 41, and the protrusion 31 is slidably provided in the inclined groove 41. When the optical cable is buried, when filling the cable trench, the lifting block 4 is slid upward, and the long rod 3 is slid through the cooperation of the inclined groove 41 and the protrusion 31, and the soil between the long rod 3 and the optical cable is pushed under the optical cable, so as to prevent the phenomenon that the optical cable cross-section is circular and difficult to fill under the optical cable during the filling operation, thereby improving the stability of the optical cable laying process and also improving the efficiency of filling the cable trench.

[0035] Furthermore, a threaded block 42 is fixedly provided on the lifting block 4, and a vertical tube 43 is threadedly connected on the threaded block 42. A locking ring 44 is fixedly provided on the vertical tube 43, and a locking piece 6 is slidably provided on the fixed frame 2. The locking piece 6 is used to limit the locking ring 44. After the vertical tube 43 rises, the lifting block 4 is driven to rise, and the long rod 3 slides, pushing the soil between the long rod 3 and the optical cable to under the optical cable. During the rising process of the vertical tube 43, the locking ring 44 is also limited by the locking piece 6, so that the vertical tube 43 cannot fall after rising. Then, the lifting block 4 is further raised by rotating the vertical tube 43, and the long rod 3 slides through the action of the inclined groove 41 and the protrusion 31, squeezing and pressing the soil pushed under the optical cable, making the optical cable more stable after being laid, and ensuring the stability of the optical cable during the working process.

[0036] Furthermore, a pressure plate 5 is slidingly provided on the fixing frame 2, and a rotating tube 51 is rotatably provided on the pressure plate 5. The rotating tube 51 is slidably connected to the vertical tube 43, and a first spring 52 is provided between the rotating block and the vertical tube 43. The two ends of the first spring 52 are respectively fixedly connected to the rotating tube 51 and the vertical tube 43. It also includes a limit pin 7, and a limit groove 33 is provided on the long rod 3. The limit pin 7 passes through the fixing frame 2 and is slidably plugged into the limit groove 33. When the optical cable is buried, the pressure plate 5 is supported on both sides of the cable trench, and the optical cable is pulled out of the ground under the action of gravity. Down, the fixing frame 2 and the optical cable move down into the cable trench. During the downward movement of the fixing frame 2, the pressure plate 5 is limited by the flat position on both sides of the cable trench, so that the pressure plate 5 and the rotating tube 51 slide relative to the fixing frame 2, and the first spring 52 is stretched. Then, after the long rod 3 is buried with soil, the limit pin 7 is pulled out. Under the action of the first spring 52, the vertical tube 43 slides with the lifting block 4, and through the cooperation of the inclined groove 41 and the protrusion 31, the long rod 3 slides to push the soil between the long rod 3 and the optical cable to the bottom of the optical cable, and fill the bottom of the optical cable.

[0037] In an embodiment further provided by the present invention, a rotating pin 53 is rotatably provided on the fixing member, and the rotating pin 53 is slidably connected to the rotating tube 51. The rotation of the rotating pin 53 drives the rotating tube 51 and the vertical tube 43 to rotate, and the threaded connection with the threaded block 42 causes the lifting block 4 to further rise. In the process of rising, the soil under the optical cable is compacted by the long rod 3 through further cooperation and extrusion between the inclined groove 41 and the protrusion 31, thereby further improving the stability of the optical cable after underground laying.

[0038] Furthermore, a second spring 61 is provided between the locking member 6 and the fixing frame 2, and the two ends of the second spring 61 are fixedly connected to the locking member 6 and the fixing frame 2 respectively. During the upward movement of the vertical tube 43, the locking ring 44 and the locking member 6 are squeezed by the inclined surface to compress the second spring 61. Therefore, the locking member 6 will not restrict the upward movement of the vertical tube 43. After the upward movement, the downward movement of the vertical tube 43 is limited by the locking ring 44. At this time, the vertical tube 43 rotates, and the locking member 6 still restricts the downward movement of the vertical tube 43. When the vertical tube 43 rotates, the lifting block 4 is moved upward by pulling the threaded block 42, and the long rod 3 is further slid through the cooperation of the inclined groove 41 and the protrusion 31, thereby compacting the soil under the optical cable and improving the stability of the optical cable laying.

[0039] Specifically, an adaption groove 32 is provided on the long rod 3, and the adaption groove 32 is adapted to the clamp 21. By providing the adaption groove 32 on the long rod 3, when the long rod 3 slides and compacts the soil under the optical cable, the radius of the clamp 21 is larger than the optical cable, which will cause the long rod 3 to be restricted in sliding, thereby affecting the soil compaction effect.

[0040] Working principle: When laying the optical cable underground, the pressure plate 5 is supported on both sides of the cable trench. Under the action of the gravity of the optical cable, the fixing frame 2 and the optical cable move down into the cable trench. During the downward movement of the fixing frame 2, the pressure plate 5 is limited by the flat position on both sides of the cable trench, so that the pressure plate 5 and the rotating tube 51 slide relative to the fixing frame 2. At this time, under the action of the limiting pin 7, the long rod 3 and the lifting block 4 do not slide, and the rotating tube 51 moves up to stretch the first spring 52. Subsequently, the cable trench is filled with soil. After the soil buries the long rod 3, the limiting pin 7 is pulled out. Under the action of the first spring 52, the vertical tube 43 and the lifting block 4 move up, and through the cooperation between the inclined slot 41 on the lifting block 4 and the protrusion 31, The long rod 3 is made to slide, and the soil between the long rod 3 and the optical cable is pushed to the bottom of the optical cable, and the soil is filled under the optical cable to prevent the bottom of the optical cable from being difficult to fill, which causes the optical cable to be unstable when used underground for a long time. In the process of the vertical pipe 43 moving upward, the locking ring 44 is limited by the locking member 6. Then, the rotating pin 53 is rotated to rotate the rotating tube 51 and the vertical pipe 43. Since the bottom of the vertical pipe 43 is threadedly connected to the threaded block 42, when the vertical pipe 43 rotates, the long rod 3 will continue to slide, and the soil under the optical cable will be compacted to improve the support stability of the optical cable. Then, the soil in the cable trench will continue to be filled and compacted to complete the stable layout of the optical cable.

[0041] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A laying assembly for a spiral optical cable for geophysical exploration, characterized in that: The laying assembly comprises a fixing frame (2), on which a clamp (21) is fixedly provided for fixing and supporting the optical cable; A long rod (3) is slidably provided on the fixing frame (2) and is used to push soil under the optical cable when the optical cable is buried; A lifting block (4) is slidably provided on the fixed frame (2), a protrusion (31) is fixedly provided on the long rod (3), an inclined groove (41) is provided on the lifting block (4), and the protrusion (31) is slidably provided in the inclined groove (41); A threaded block (42) is fixedly provided on the lifting block (4), a vertical pipe (43) is threadedly connected to the threaded block (42), a locking ring (44) is fixedly provided on the vertical pipe (43), and a locking member (6) is slidably provided on the fixing frame (2), and the locking member (6) is used to limit the locking ring (44); A pressure plate (5) is slidably provided on the fixing frame (2), a rotating tube (51) is rotatably provided on the pressure plate (5), the rotating tube (51) is slidably connected to the vertical tube (43), and a first spring (52) is provided between the rotating tube (51) and the vertical tube (43), and two ends of the first spring (52) are fixedly connected to the rotating tube (51) and the vertical tube (43) respectively; A rotating pin (53) is rotatably provided on the fixing frame (2), and the rotating pin (53) is slidably connected to the rotating tube (51).

2. The laying assembly of the spiral optical cable for geophysical exploration according to claim 1, characterized in that: A second spring (61) is provided between the locking member (6) and the fixing frame (2), and two ends of the second spring (61) are fixedly connected to the locking member (6) and the fixing frame (2), respectively.

3. The laying assembly of the spiral optical cable for geophysical exploration according to claim 1, characterized in that: It also includes a limit pin (7), a limit slot (33) is provided on the long rod (3), and the limit pin (7) passes through the fixing frame (2) and is slidably plugged into the limit slot (33).

4. The laying assembly of the spiral optical cable for geophysical exploration according to claim 1, characterized in that: An adaption groove (32) is provided on the long rod (3), and the adaption groove (32) is adapted to the clamp (21).

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