Spiral optical cable for geophysical exploration

Abstract

The invention discloses a spiral optical cable for geophysical exploration, which comprises an outer sheath and an inner sheath, the outer surface of the inner sheath is coated with the outer sheath, a plurality of spiral optical fibers are arranged between the outer sheath and the inner sheath, and the spiral angles of the plurality of spiral optical fibers are 20-70 degrees; the single-mode bending insensitive optical fiber further comprises a steel wire armoring layer, the outer surface of the steel wire armoring layer is wrapped by the inner protection layer, the steel wire armoring layer is two layers of double-alloy coating steel wire spiral armoring in opposite directions, the spiral winding angle of the multiple single-mode bending insensitive optical fibers ranges from 20 degrees to 70 degrees, and the spiral optical fiber is used for guaranteeing the light propagation mode, polarization retentivity, phase control and loss characteristics. The spiral angles of the multiple spiral optical fibers are made to be consistent so as to optimize the performance of the optical cable, and the steel wire armor layer is arranged to be spirally armored by two layers of ultrahigh-strength double-alloy coating steel wires with opposite directions, so that the stability of the optical cable during exploration operation is ensured.

Description

Technical Field

[0001] The 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 cable in geophysical exploration mainly relies on its efficient signal transmission and precise positioning function in underground detection. It combines fiber optic sensing technology with the needs of geophysical exploration and is suitable for 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 the prior art needs to be improved during their deployment and use. In particular, during the deployment process, it is necessary to strictly control parameters such as the tension and bending radius of the optical cable. 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: 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, and the spiral angles of the plurality of spiral optical fibers are all 20° to 70°; 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; Also included is a laying component for laying the optical cable.

[0006] Preferably, it also includes a sensing optical fiber, a stainless steel tube is arranged outside the sensing optical fiber, a steel wire armor layer is arranged outside the stainless steel tube, and the sensing optical fiber is composed of single-mode and multi-mode optical fibers.

[0007] Preferably, the laying assembly comprises a fixing frame, on which a clamp is fixedly provided, which is used to fix and support the optical cable; A long rod is slidably arranged on the fixing frame, and is used to push the soil under the optical cable when the optical cable is buried; A lifting block is slidably arranged on the fixed frame, a convex block is fixedly arranged on the long rod, an inclined groove is arranged on the lifting block, and the convex block is slidably arranged in the inclined groove.

[0008] 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 fixed frame, and the locking piece is used to limit the locking ring.

[0009] 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 both ends of the first spring are fixedly connected to the rotating tube and the vertical tube respectively.

[0010] Preferably, a rotating pin is rotatably provided on the fixing member, and the rotating pin is slidably connected to the rotating tube.

[0011] 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.

[0012] Preferably, it further comprises a limit pin, and a limit slot is arranged on the long rod, and the limit pin passes through the fixing frame and is slidably connected with the limit slot.

[0013] Preferably, an adaption groove is provided on the long rod, and the adaption groove is adapted to the clamp.

[0014] In the above technical solution, the spiral optical cable for geophysical exploration provided by the present invention has the following beneficial effects: 1. By spirally winding multiple single-mode bend-insensitive optical fibers at an angle of 20° to 70°, the propagation mode, polarization retention, phase control, and loss characteristics of the spiral optical fibers for light are ensured, 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 ensured.

[0015] 2. When laying the optical cable underground and filling the cable trench, slide the long rod to 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 during laying.

[0016] 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.

[0017] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A schematic diagram of the main structure of an optical cable provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of the layout components provided in an embodiment of the present invention; Figure 3 A schematic diagram of the lifting block and the pressing plate structure provided in an embodiment of the present invention; Figure 4 A schematic diagram of a long rod structure provided in an embodiment of the present invention.

[0020] Description of reference numerals: 1. Outer sheath; 11. Helix angle; 12. Helix 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. Limit groove; 4. Lifting block; 41. Oblique groove; 42. Threaded block; 43. Vertical tube; 44. Locking ring; 5. Pressing plate; 51. Rotating tube; 52. First spring; 53. Rotating pin; 6. Locking piece; 61. Second spring; 7. Limit pin. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the 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.

[0022] 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, 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 two layers of double-alloy coated steel wire spiral armor in opposite directions; further comprising a laying component, which is used for laying 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 fiber 12 has a light propagation mode, polarization retention, Phase control and loss characteristics are generally adjusted through actual application to adjust 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 as 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.

[0023] Specifically, it also includes a sensing optical fiber 16, a stainless steel tube 15 is arranged 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, and the sensing optical fiber 16 in the tube is protected 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.

[0024] In an embodiment further provided by the present invention, the laying component 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, a protrusion 31 is fixedly provided on the long rod 3, and an inclined groove 41 is provided on the lifting block 4, and the protrusion 31 is slidably provided in the inclined groove 41. When the optical cable is buried and the cable trench is filled with soil, 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 to push the soil between the long rod 3 and the optical cable to under the optical cable, so as 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 and also improving the efficiency of filling the cable trench.

[0025] Furthermore, a threaded block 42 is fixedly provided on the lifting block 4, and a vertical pipe 43 is threadedly connected on the threaded block 42. A locking ring 44 is fixedly provided on the vertical pipe 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 pipe 43 rises, the lifting block 4 is driven to rise, so that the long rod 3 slides and the soil between the long rod 3 and the optical cable is pushed to the bottom of the optical cable. During the rising process of the vertical pipe 43, the locking ring 44 is also limited by the locking piece 6, so that the vertical pipe 43 cannot fall after rising. Subsequently, the lifting block 4 is further raised by rotating the vertical pipe 43, and the long rod 3 slides through the action of the inclined groove 41 and the protrusion 31, so that the soil pushed to the bottom of the optical cable is squeezed and pressed, so that the optical cable is more stable after being laid, thereby ensuring the stability of the optical cable during the working process.

[0026] Furthermore, 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 with 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 with the rotating tube 51 and the vertical tube 43, and also includes a limit pin 7, 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 pressed under the gravity of the 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 pressing plate 5 is limited by the flat positions on both sides of the cable trench, so that the pressing plate 5 and the rotating tube 51 slide relative to the fixing frame 2, and the first spring 52 is lengthened. Then, after the long rod 3 is buried with soil, the limiting 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 the soil is filled under the optical cable.

[0027] 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 rotating pin 53 is rotated to drive the rotating tube 51 and the vertical tube 43 to rotate, and the lifting block 4 is further lifted up through the threaded connection with the threaded block 42. In the process of lifting up, the soil under the optical cable is compacted by the long rod 3 through the further cooperation and extrusion of the inclined groove 41 and the protrusion 31, thereby further improving the stability of the optical cable after underground laying.

[0028] 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 limit 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 limits 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, so that the long rod 3 can be further slid through the cooperation of the inclined groove 41 and the protrusion 31, so as to compact the soil under the optical cable and improve the stability of the optical cable laying.

[0029] Specifically, the long rod 3 is provided with an adapting groove 32, which is adapted to the clamp 21. By providing the adapting groove 32 on the long rod 3, when the long rod 3 slides to compact the soil under the optical cable, the long rod 3 will not be restricted in sliding due to the radius of the clamp 21 being larger than the optical cable, thereby affecting the soil compaction effect.

[0030] Working principle: When laying the optical cable underground, the pressure plate 5 is supported on both sides of the cable trench. Under 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 filling 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 groove 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, resulting in the phenomenon that the optical cable is 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, and 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 with 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. Subsequently, the cable trench is filled and compacted to complete the stable deployment of the optical cable.

[0031] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A spiral optical cable for geophysical exploration, characterized in that: The invention comprises an outer sheath (1) and an inner sheath (13), wherein the outer sheath (1) covers 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 between 20° and 70°; It also comprises a steel wire armor layer (14), the inner protective layer (13) being coated on the outer surface of the steel wire armor layer (14), and the steel wire armor layer (14) is two layers of double alloy coated steel wire spiral armor in opposite directions; Also included is a laying component for laying the optical cable.

2. The spiral optical cable for geophysical exploration according to claim 1, characterized in that: It also comprises a sensing optical fiber (16), wherein a stainless steel tube (15) is arranged outside the sensing optical fiber (16), and a steel wire armor layer (14) is arranged outside the stainless steel tube (15), and the sensing optical fiber (16) is composed of single-mode and multi-mode optical fibers.

3. The spiral optical cable for geophysical exploration according to claim 1, characterized in that: The laying assembly comprises a fixing frame (2), on which a clamp (21) is fixedly arranged for fixing and supporting the optical cable; A long rod (3) is slidably arranged 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 disposed on the fixed frame (2), a protrusion (31) is fixedly disposed on the long rod (3), an inclined groove (41) is disposed on the lifting block (4), and the protrusion (31) is slidably disposed in the inclined groove (41).

4. The spiral optical cable for geophysical exploration according to claim 3, characterized in that: 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).

5. The spiral optical cable for geophysical exploration according to claim 4, characterized in that: A pressure plate (5) is slidably provided on the fixed 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 block and the vertical tube (43), and two ends of the first spring (52) are respectively fixedly connected to the rotating tube (51) and the vertical tube (43).

6. The spiral optical cable for geophysical exploration according to claim 5, characterized in that: A rotating pin (53) is rotatably provided on the fixing member, and the rotating pin (53) is slidably connected to the rotating tube (51).

7. The spiral optical cable for geophysical exploration according to claim 4, 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 respectively fixedly connected to the locking member (6) and the fixing frame (2).

8. The spiral optical cable for geophysical exploration according to claim 3, 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).

9. The spiral optical cable for geophysical exploration according to claim 3, characterized in that: The long rod (3) is provided with an adaption groove (32), and the adaption groove (32) is adapted to the clamp (21).

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