Method and device for repairing oil-filled submarine cable underwater

Abstract

The invention provides a repairing method and device for underwater repairing of an oil-filled submarine cable, and the method comprises the following steps: enabling a first clamp to wrap the periphery of an oil leakage region part of the submarine cable, so as to form a plugging cavity between the submarine cable and the first clamp; second clamps are installed at the two ends of the first clamp, the second clamps are arranged on the periphery of the submarine cable in a wrapping mode, and a glue injection cavity is formed between the submarine cable and the second clamps; the first adhesive is injected into the adhesive injection cavity, after the first adhesive is injected, the second adhesive is injected into the adhesive injection cavity after a first time interval, and the viscosity of the first adhesive is smaller than that of the second adhesive.

Description

Technical Field

[0001] The present application relates to the technical field of oil-filled submarine cable repair, and in particular to a repair method and device for underwater repair of oil-filled submarine cables. Background Art

[0002] When oil-filled submarine cables work for a long time in a complex environment such as the ocean, it is easy for the outer sheath to rupture and cause insulation oil leakage, and the ruptured oil-filled submarine cables need to be repaired. At present, the repair of oil-filled submarine cables is mostly done by salvaging the submarine cables onto the ship for repair. This repair method not only requires the submarine cables to have sufficient redundant length for salvaging, but also easily causes damage to the outer sheath of the submarine cables during the salvaging process. Summary of the invention

[0003] The present application provides a repair method and device for underwater repair of an oil-filled submarine cable, so as to solve the problem in the known technology that the repair of the submarine cable is limited by its own redundant length and the submarine cable is easily damaged during the repair process.

[0004] The present application provides a repair method for underwater repair of an oil-filled submarine cable, comprising the following steps: wrapping a first clamp around the periphery of an oil leaking area of ​​a submarine cable to form a plugging cavity between the submarine cable and the first clamp; installing a second clamp at both ends of the first clamp, and wrapping the second clamp around the periphery of the submarine cable to form a glue injection cavity between the submarine cable and the second clamp; firstly injecting a first adhesive into the glue injection cavity, and after the first adhesive is injected, injecting a second adhesive into the glue injection cavity after a first time interval, wherein the viscosity of the first adhesive is less than the viscosity of the second adhesive.

[0005] In a possible implementation, the first adhesive is injected by pneumatic injection, and the injection pressure of the first adhesive during injection is V1, V1=V3+(0.1~0.5MPa), wherein V3 is the water pressure in the seawater where the submarine cable is located.

[0006] In a possible implementation, the second adhesive is injected by pneumatic injection, and the injection pressure of the second adhesive during injection is V2, V2=V3+(0.5~1.2MPa), wherein V3 is the water pressure in the seawater where the submarine cable is located.

[0007] In a possible implementation manner, when the first adhesive is injected into the adhesive injection cavity, the injection port of the first adhesive is located at a side of the adhesive injection cavity away from the sea level; When the second adhesive is injected into the adhesive injection cavity, the injection port of the second adhesive is located at a side of the adhesive injection cavity close to the sea level.

[0008] In a possible implementation manner, after the first adhesive is injected into the glue injection cavity, a first pressure-maintaining gas is transported into the glue injection cavity to form a first pressure-maintaining environment, and the first pressure-maintaining environment is maintained for the first time; The gas pressure of the first pressure-maintaining gas is V4, V4=V6+(0.5-1.2 MPa), wherein V6 is the water pressure in the seawater where the submarine cable is located, and the first time is 2-6 minutes.

[0009] In a possible implementation manner, after the second adhesive is injected into the glue injection cavity, a second pressure-maintaining gas is transported into the glue injection cavity to form a second pressure-maintaining environment, and the second pressure-maintaining environment is maintained for a second time; The gas pressure of the second pressure-maintaining gas is V5, V5=V6+(0.5~1.2MPa), wherein V6 is the water pressure in the seawater where the submarine cable is located, and the second time is 2~6min.

[0010] The present application also provides a repair device for underwater repair of an oil-filled submarine cable, comprising a first clamp, a second clamp, and a second sealing structure; the first clamp is configured to be wrapped around the outer circumference of the submarine cable, and a sealing cavity is formed between the first clamp and the submarine cable; the second clamp is configured to be wrapped around the outer circumference of the submarine cable, and the two ends of the first clamp are respectively provided with the second clamps connected thereto, and a glue injection cavity is formed between the second clamp and the submarine cable, and the glue injection cavity is configured to accommodate an adhesive, and the adhesive is configured to seal the openings at both ends of the sealing cavity; the second sealing structure is detachably connected to one end of the second clamp away from the first clamp, and the second sealing structure is configured to seal the end of the glue injection cavity away from the first clamp.

[0011] In a possible implementation manner, first sealing grooves are formed at both ends of the first clamp, the first sealing grooves are connected to the blocking cavity, and a third sealing groove is formed at one end of the second clamp close to the first clamp, the third sealing groove is connected to the glue injection cavity; The repair device for underwater repair of oil-filled submarine cables also includes a first sealing structure, wherein a portion of the first sealing structure is disposed in the first sealing groove, and another portion of the first sealing structure is disposed in the third sealing groove.

[0012] In a possible implementation, a second sealing groove is formed at one end of the second clamp away from the first clamp, the second sealing groove is connected to the glue injection cavity, and the second sealing structure is at least partially located in the second sealing groove.

[0013] In a possible implementation manner, the first clamp includes a first upper clamp and a first lower clamp, the first upper clamp is connected to the first lower clamp, and the first upper clamp and the first lower clamp together form a first receiving cavity, and the first receiving cavity is for the submarine cable to pass through; and / or, The second clamp comprises a second upper clamp and a second lower clamp, the second upper clamp is connected to the second lower clamp, and the second upper clamp and the second lower clamp together form a second receiving cavity, and the second receiving cavity is for the submarine cable to pass through.

[0014] The repair method for underwater repair of an oil-filled submarine cable of the present application comprises the following steps: wrapping a first clamp around the outer periphery of the oil leakage area of ​​the submarine cable, so as to cover the oil leakage area of ​​the submarine cable by the first clamp, and sealing both ends of the first clamp by a first sealing structure and injecting adhesive into the glue injection cavity formed by the second clamp to achieve plugging of the openings at both ends of the first clamp, thereby achieving complete closure of the sealing cavity formed between the first clamp and the submarine cable, preventing insulating oil from leaking from the submarine cable, and achieving plugging and repair of the oil leakage area of ​​the submarine cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an embodiment of a repair device for underwater repair of an oil-filled submarine cable of the present application.

[0016] Figure 2 It is a cross-sectional schematic diagram of an embodiment of a repair device for underwater repair of an oil-filled submarine cable of the present application.

[0017] Figure 3 This is a schematic diagram of the connection between the first clamp and the second clamp in one embodiment of the repair device for underwater repair of an oil-filled submarine cable of the present application.

[0018] Figure 4 This is a schematic structural diagram of a second clamp in one embodiment of a repair device for underwater repair of an oil-filled submarine cable of the present application.

[0019] Figure 5 This is a structural schematic diagram from another perspective of the second clamp of one embodiment of the repair device for underwater repair of an oil-filled submarine cable of the present application.

[0020] Figure 6 This is a schematic structural diagram of a pressure plate in one embodiment of a repair device for underwater repair of an oil-filled submarine cable of the present application.

[0021] Figure 7 This is a schematic structural diagram of a first lower clamp in one embodiment of a repair device for underwater repair of an oil-filled submarine cable of the present application.

[0022] Figure 8This is a schematic structural diagram of a second upper clamp in one embodiment of a repair device for underwater repair of an oil-filled submarine cable of the present application.

[0023] Fig. 9 This is a schematic structural diagram of a second lower clamp in one embodiment of a repair device for underwater repair of an oil-filled submarine cable of the present application.

[0024] Fig.10 It is a schematic diagram of the flow chart of a repair method for underwater repair of an oil-filled submarine cable in one embodiment of the present application.

[0025] Description of main component symbols: 200, a repair method for underwater repair of an oil-filled submarine cable; 100, a repair device for underwater repair of an oil-filled submarine cable; 1, a first seal; 2, a second seal; 3, a third seal; 10, a first clamp; 11, a first upper clamp; 111, a first flange; 1110, a first connecting protrusion; 112, a first pipeline; 12, a first lower clamp; 121, a second flange; 1210, a second connecting protrusion; 122, a second pipeline; 13, a first protrusion; 131, a first connecting hole; 132, a first receiving groove; 14, a first bolt; 15, a second bolt; 16, a blocking cavity; 17, a first receiving cavity; 18, a first sealing groove; 20, a second clamp; 21, a second upper Clamp; 211, second glue inlet; 212, first outlet; 22, second lower clamp; 221, first glue inlet; 222, second outlet; 23, second convex portion; 230, second connecting hole; 24, third convex portion; 241, third connecting hole; 242, second receiving groove; 25, glue injection cavity; 26, second receiving cavity; 27, third sealing groove; 28, second sealing groove; 30, first sealing structure; 31, first sealing ring; 311, first conical portion; 312, first rectangular portion; 40, second sealing structure; 41, second sealing ring; 411, second conical portion; 412, second rectangular portion; 42, pressing plate; 421, sub-plate; 4210, fourth connecting hole; 422, fourth sealing groove.

[0026] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0027] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0028] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0029] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0030] The specific implementation methods of the present application are further described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 to Figure 2 As shown, this embodiment provides a repair device 100 for underwater repair of an oil-filled submarine cable, comprising a first clamp 10 , a second clamp 20 , and a second sealing structure 40 .

[0032] The first clamp 10 is configured to be wrapped around the outer periphery of the oil leakage area of ​​the submarine cable, and a sealing cavity 16 is formed between the first clamp 10 and the submarine cable. The insulating oil leaking from the oil leakage area of ​​the submarine cable will flow into the sealing cavity 16 and be temporarily stored, and then the temporarily stored insulating oil will be discharged by draining the sealing cavity 16.

[0033] The second clamp 20 is configured to be wrapped around the outer circumference of the submarine cable, and the second clamps 20 connected thereto are respectively provided at both ends of the first clamp 10, and the second clamp 20 is arranged adjacent to the first clamp 10. A glue injection cavity 25 is formed between the second clamp 20 and the submarine cable, and the glue injection cavity 25 is configured to contain adhesive, and the adhesive can seal the openings at both ends of the sealing cavity 16 after being cured and formed in the glue injection cavity 25. The second sealing structure 40 is detachably connected to one end of the second clamp 20 away from the first clamp 10, and the second sealing structure 40 is configured to seal one end of the glue injection cavity 25 away from the first clamp 10, so as to facilitate the injection of adhesive into the glue injection cavity 25.

[0034] Please combine again Figures 2 to 6In one embodiment, the first clamp 10 is a structure that is generally hollow inside and open at both ends, and the cross-sectional shape of the first clamp 10 is generally an "I" shape. A first receiving cavity 17 is provided in the first clamp 10, and along the direction of the axis of the first clamp 10, the first receiving cavity 17 extends from the end surface of one end of the first clamp 10 to the end surface of the other end of the first clamp 10. The oil leakage area of ​​the submarine cable can be accommodated in the first receiving cavity 17. The end surfaces of both ends of the first clamp 10 are provided with first sealing grooves 18, the first sealing grooves 18 are connected to the first receiving cavity 17, and the first sealing grooves 18 are arranged around the openings at the ends of the first clamp 10.

[0035] The second clamp 20 is also a structure that is generally hollow inside and open at both ends, and the cross-sectional shape of the second clamp 20 is generally an "I" shape. A second receiving cavity 26 is provided in the second clamp 20, and along the direction of the axis of the second clamp 20, the second receiving cavity 26 extends from the end surface of one end of the second clamp 20 to the end surface of the other end of the second clamp 20. The adjacent area of ​​the oil leakage area of ​​the submarine cable can be accommodated in the second receiving cavity 26. A second sealing groove 28 is provided on the end surface of the second clamp 20 away from the first clamp 10, and the second sealing groove 28 is connected to the second receiving cavity 26. A third sealing groove 27 is provided on the end surface of the second clamp 20 close to the first clamp 10, and the third sealing groove 27 is connected to the second receiving cavity 26. The second sealing groove 28 and the third sealing groove 27 are both arranged around the opening at the end of the second clamp 20.

[0036] In this embodiment, the repair device 100 for underwater repair of an oil-filled submarine cable further includes a first sealing structure 30, a portion of which is disposed in the first sealing groove 18, and another portion of which is disposed in the third sealing groove 27. The first sealing structure 30 includes two first sealing rings 31, which are respectively disposed at the first sealing grooves 18 at both ends of the first clamp 10 to seal the blocking cavity 16 when the first clamp 10 is wrapped around the outer periphery of the submarine cable.

[0037] The first sealing ring 31 is a conical sealing ring, and includes an integrally formed first conical portion 311 and a first rectangular portion 312. The cross-sectional shape of the first sealing groove 18 is conical, and is adapted to the first conical portion 311 of the first sealing ring 31, so that the first conical portion 311 is clamped in the first sealing groove 18 to seal the end of the first fixture 10. The cross-sectional shape of the third sealing groove 27 is rectangular, and is adapted to the first rectangular portion 312 of the first sealing ring 31, so that the first rectangular portion 312 is clamped in the third sealing groove 27.

[0038] In addition, when the second clamp 20 is connected to the first clamp 10, the end faces of the second clamp 20 and the adjacent ends of the first clamp 10 are fitted together, and the first sealing groove 18 is connected to the third sealing groove 27. The second clamp 20 presses the first sealing ring 31 against the groove wall of the first sealing groove 18 to seal the fitting point between the first clamp 10 and the second clamp 20 through the first sealing ring 31.

[0039] In this embodiment, the second sealing structure 40 includes a second sealing ring 41 and a pressing plate 42 .

[0040] The second sealing ring 41 is also a conical sealing ring, and its structure is the same as that of the first sealing ring 31. The second sealing ring 41 includes an integrally formed second conical portion 411 and a second rectangular portion 412. The cross-sectional shape of the second sealing groove 28 is conical, and is adapted to the second conical portion 411 of the second sealing ring 41, so that the second conical portion 411 is clamped in the second sealing groove 28 to seal the end of the second fixture 20 away from the first fixture 10.

[0041] The pressing plate 42 is generally a circular ring structure and is sleeved on the outer circumference of the submarine cable. The pressing plate 42 is located on the side of the second clamp 20 away from the first clamp 10, and a fourth sealing groove 422 is provided on the side of the pressing plate 42 close to the second clamp 20. The cross-sectional shape of the fourth sealing groove 422 is rectangular, and is adapted to the second rectangular portion 412 of the second sealing ring 41, so that the second rectangular portion 412 is clamped in the fourth sealing groove 422. When the pressing plate 42 is connected to the second clamp 20, the pressing plate 42 presses the second sealing ring 41 against the groove wall of the second sealing groove 28.

[0042] Please combine again Figures 2 to 6 In one embodiment, the outer circumference of both ends of the first clamp 10 is surrounded by a first convex portion 13. The first convex portion 13 is provided with a plurality of first connection holes 131, which penetrate the first convex portion 13, and the plurality of first connection holes 131 are arranged at equal intervals around the axis of the first clamp 10. A plurality of first receiving grooves 132 are provided on the adjacent side of the two first convex portions 13, and the plurality of first receiving grooves 132 are arranged one by one with the plurality of first connection holes 131, and the first receiving grooves 132 are connected to the corresponding first connection holes 131, and the cross-sectional shape of the first receiving grooves 132 is roughly a gate arch.

[0043] A second convex portion 23 is provided on the outer peripheral surface of one end of the second clamp 20 close to the first clamp 10, and a plurality of second connecting holes 230 are opened on the second convex portion 23. The second connecting holes 230 penetrate the second convex portion 23, and the plurality of second connecting holes 230 are arranged corresponding to the plurality of first connecting holes 131. The second connecting holes 230 and the first connecting holes 131 are provided for the first bolt 14 to pass through. The nut end of the first bolt 14 is located in the first accommodating groove 132 to prevent the first bolt 14 from rotating. Therefore, when the nut is installed on the first bolt 14, it can be locked by tightening the nut with only one wrench, which greatly improves the convenience of underwater operation.

[0044] A third protrusion 24 is provided on the outer peripheral surface of one end of the second clamp 20 away from the first clamp 10, and a plurality of third connecting holes 241 are formed on the third protrusion 24. The second connecting hole 230 passes through the third protrusion 24, and a plurality of second receiving grooves 242 are formed on the side of the third protrusion 24 close to the second protrusion 23. The plurality of second receiving grooves 242 are arranged in one-to-one correspondence with the plurality of third connecting holes 241, and the second receiving grooves 242 are connected to the corresponding third connecting holes 241, and the cross-sectional shape of the second receiving grooves 242 is roughly a gate arch shape.

[0045] The pressing plate 42 is provided with a plurality of fourth connection holes 4210, which penetrate the pressing plate 42. The plurality of fourth connection holes 4210 are arranged corresponding to the plurality of third connection holes 241, and the fourth connection holes 4210 and the third connection holes 241 are provided for the first bolt 14 to pass through, and the nut end of the first bolt 14 is located in the second receiving groove 242 to prevent the first bolt 14 from rotating, so that when the nut is installed on the first bolt 14, it can be locked by tightening the nut with only one wrench, which greatly improves the convenience of underwater operation.

[0046] Please combine again Figures 6 to 9 , and see Figure 2 and Figure 3 In one embodiment, the first clamp 10 includes a first upper clamp 11 and a first lower clamp 12. The first upper clamp 11 is connected to the first lower clamp 12, and the first upper clamp 11 and the first lower clamp 12 together form a first receiving cavity 17, and the first receiving cavity 17 is for the submarine cable to pass through.

[0047] The first upper clamp 11 and the first lower clamp 12 are both Haversian structures, and the cross-sections of the two are both semicircular. In the vertical direction, the first upper clamp 11 is located on the side of the first lower clamp 12 close to the sea level. In the horizontal direction, the first upper clamp 11 is provided with a first flange 111 on both sides opposite to each other, and the first lower clamp 12 is provided with a second flange 121 on both sides opposite to each other. The first flange 111 and the second flange 121 are both horizontal flanges. When the first upper clamp 11 and the first lower clamp 12 are connected, the first flange 111 and the second flange 121 fit together.

[0048] In particular, the first clamp 10 further includes a first sealing member 1, which is a long strip-shaped sealing strip. There are two first sealing members 1, and the two first sealing strips are attached to the end surface of the first lower clamp 12 close to the first upper clamp 11 to seal the two joints between the first upper clamp 11 and the first lower clamp 12, thereby ensuring the radial sealing of the blocking cavity 16. The first sealing strip can be pre-attached to the first lower clamp 12 on the shore, so as to improve the installation efficiency when the first clamp 10 is subsequently installed in the sea.

[0049] In this embodiment, along the horizontal direction, the end surface of the first flange 111 away from the first upper clamp 11 is provided with two first connection protrusions 1110, and along the direction of the axis of the first clamp 10, the two first connection protrusions 1110 are arranged at intervals. Along the horizontal direction, the end surface of the second flange 121 away from the first lower clamp 12 is provided with two second connection protrusions 1210, and along the direction of the axis of the first clamp 10, the two second connection protrusions 1210 are arranged at intervals.

[0050] The first clamp 10 further includes a second bolt 15, which is a swing bolt. One end of the second bolt 15 is located between the two second connection protrusions 1210 and is rotatably connected to the two second connection protrusions 1210. The other end of the second bolt 15 is located between the two first connection protrusions 1110 and is connected to the two first connection protrusions 1110 through a nut and a gasket. In this way, a flat washer, a standard spring washer and a nut can be installed on the swing bolt in advance on shore, and one end of the swing bolt is installed on the swing bolt shaft provided on the two second connection protrusions 1210, and molybdenum disulfide anti-locking agent is applied, so that the installation efficiency can be improved when the first clamp 10 is installed in the sea later.

[0051] It is worth noting that a plurality of groups of second connection protrusions and first connection protrusions may be provided and arranged in sequence and spaced apart along the axial direction of the first clamp 10 to improve the tightness of the connection between the first upper clamp 11 and the first lower clamp 12 .

[0052] In this embodiment, the second clamp 20 includes a second upper clamp 21 and a second lower clamp 22, the second upper clamp 21 is connected to the second lower clamp 22, and the second upper clamp 21 and the second lower clamp 22 jointly form a second receiving cavity 26. The structure and installation principle of the second upper clamp 21 and the second lower clamp 22 are the same as those of the first upper clamp 11 and the first lower clamp 12, and will not be repeated.

[0053] The second clamp 20 further includes a second seal 2 and a third seal 3. The second seal 2 is an arc-shaped seal strip, and the second seal 2 is attached to the surface of the second upper clamp 21 on one side close to the second lower clamp 22. Two second seals 2 are provided, and the two second seals 2 are respectively located at positions close to both ends of the second upper clamp 21.

[0054] The third sealing member 3 is a composite structure composed of an arc-shaped sealing strip and a long sealing strip, part of which is adhered to the arc area of ​​the surface of the second lower clamp 22 on one side close to the second upper clamp 21, and part of which is adhered to the area where the second lower clamp 22 and the second upper clamp 21 are adhered to ensure the sealing after the second upper clamp 21 and the second lower clamp 22 are connected.

[0055] In this embodiment, the pressing plate 42 includes two sub-plates 421, and both of the two sub-plates 421 are semi-circular ring structures, so that the pressing plate 42 is formed by splicing the two sub-plates 421. The direction of the gap at the connection between the two sub-plates 421 is perpendicular to the direction of the gap at the connection between the second upper clamp 21 and the second lower clamp 22, so as to improve the blocking effect of the pressing plate 42 on the end of the second clamp 20 away from the first clamp 10.

[0056] It is worth noting that in other embodiments, the number of the second clamps 20 located on any side of the first clamp 10 can be set to two or more. Two or more second clamps 20 are arranged adjacent to each other in sequence, and the installation method and sealing method between any two adjacent second clamps 20 are the same as those between the second clamps 20 and the first clamp 10. The end of the second clamp 20 located farthest from the first clamp 10 away from the first clamp 10 is sealed by the above-mentioned pressing plate 42 and the second sealing ring 41.

[0057] Please combine again Figures 2 to 5 In one embodiment, a first pipeline 112 is provided on the first upper fixture 11, and a second pipeline 122 is provided on the first lower fixture 12. The first pipeline 112 and the second pipeline 122 are both fluidically connected to the blocking cavity 16. The number of the second pipelines 122 can be set to two. Switch valves can be provided on the first pipeline 112 and the second pipeline 122 to control the on-off thereof, and gas can be injected into the blocking cavity 16 through the second pipeline 122, so that the insulating oil in the blocking cavity 16 is discharged from the first pipeline 112 to the collection device to recover the insulating oil.

[0058] The second fixture 20 is provided with a first glue inlet 221 and a second glue inlet 211 . The first glue inlet 221 is provided on a side of the second lower fixture 22 away from the second upper fixture 21 , and the second glue inlet 211 is provided on a side of the second upper fixture 21 away from the second lower fixture 22 .

[0059] In particular, the second upper fixture 21 is provided with a first outlet 212 on one side away from the second lower fixture 22, and the second lower fixture 22 is provided with a second outlet 222 on one side away from the second upper fixture 21. Valves are provided at the first glue inlet 221, the second glue inlet 211, the first outlet 212, and the second outlet 222 to control their on and off.

[0060] In this way, the first adhesive with lower viscosity and higher permeability is first injected from bottom to top to replace the seawater and then enters the glue injection cavity 25, and the replaced seawater is discharged from the first outlet 212. Then, the second adhesive with higher viscosity and lower permeability is injected from top to bottom to replace the first adhesive, and the replaced first adhesive is discharged from the second outlet 222, thereby improving the strength of the inner and outer layers of glue in the glue injection cavity 25 to ensure the sealing effect.

[0061] like Fig.10 As shown, this embodiment also provides a repair method 200 for underwater repair of an oil-filled submarine cable, comprising the following steps: S1. Wrap the first clamp 10 around the outer periphery of the oil leakage area of ​​the submarine cable to form a sealing cavity 16 between the submarine cable and the first clamp 10.

[0062] Before step S1, firstly, glue the first seal 1 to the first lower clamp 12, the second seal 2 to the second upper clamp 21, and the third seal 3 to the second lower clamp 22 on the shore. Then, send the first clamp 10 and the second clamp 20 and other devices to the oil leakage area of ​​the submarine cable, peel off the outer sheath of the submarine cable to expose the armor layer, use brushes, rags, shovels and other tools to clean the attachments, asphalt, etc. on the surface of the submarine cable, and ensure that the second seal 2, the third seal 3 and the submarine cable armor layer are tightly attached to ensure sealing. Next, use a rubber hammer to gently tap the bulge and bulge of the submarine cable to ensure a certain degree of roundness.

[0063] In step S1, the first upper clamp 11 and the first lower clamp 12 are firstly mounted on the submarine cable, and then the second bolt 15 of the first clamp 10 is installed. When installing the second bolt 15 of the first clamp 10, the following steps are included: S11, first install the second bolts 15 at the four corners of the first clamp 10, and use a wrench to only tighten without applying force.

[0064] S12, hang up all the second bolts 15 of the first clamp 10, and tighten them manually.

[0065] S13, starting from the positions of the 3rd to 4th second bolts 15 from both ends of the first clamp 10 to the middle, start to lock both sides synchronously, and tighten in the order from both ends to the middle.

[0066] S14. Use a torque wrench to tighten all second bolts 15 with a torque of 80~300N·m.

[0067] S2, installing the first sealing structure 30 on both ends of the first fixture 10.

[0068] In step S2 , two first sealing rings 31 are placed in two first sealing grooves 18 respectively, and the angle between the cutting seam and the horizontal line is 30-60°, that is, the cutting seam is staggered with the first flange 111 and the second flange 121 .

[0069] S3, installing the second clamp 20 at both ends of the first clamp 10, and wrapping the second clamp 20 around the outer circumference of the submarine cable to form a glue injection cavity 25 between the submarine cable and the second clamp 20.

[0070] In this step, the second upper clamp 21 and the second lower clamp 22 are arranged around the outer periphery of the submarine cable, and the second upper clamp 21 is connected to the second lower clamp 22 by the first bolt 14 and the second bolt 15, and the second clamp 20 is connected to the first clamp 10. When installing the first bolt 14 and the second bolt 15 of the second clamp 20, the following steps are specifically included: S31 , keeping the first flange 111 and the second flange 121 of the second upper clamp 21 and the second lower clamp 22 in a horizontal state, and tightening the second bolts 15 on the first flange 111 and the second flange 121 with a wrench.

[0071] S32. When locking the first flange 111 and the second flange 121, the second protrusion 23 and the third protrusion 24 are positioned by the first bolt 14. Note that the nut on the first bolt 14 is in the first receiving groove 132 to prevent rotation.

[0072] S33 , after the first flange 111 and the second flange 121 are locked with the second bolts 15 , the first bolts 14 on the second protrusion 23 and the third protrusion 24 are tightened with a wrench.

[0073] S34, tighten all the first bolts 14 with a torque wrench, with a torque of 80-300 N·m. If the second fixture 20 is to be further installed on the side away from the first fixture 10 to meet the expansibility, continue to use step S3 for installation.

[0074] S4. Install the second sealing structure 40 on an end of the second fixture 20 away from the first fixture 10 .

[0075] In this step, first install the second sealing ring 41 in the second sealing groove 28 of the second fixture 20, and then use the first bolt 14 to fasten the pressure plate 42 to the second fixture 20, ensuring that the gap between the two sub-plates 421 is in the vertical direction. After the diagonal tightening of the pressure plate 42, use a torque wrench to tighten all the first bolts 14, and the torque is 80~300N·m.

[0076] S5, first injecting a first adhesive into the glue injection cavity 25, and then injecting a second adhesive into the glue injection cavity 25 after a first time interval after the first adhesive is injected, wherein the viscosity of the first adhesive is less than that of the second adhesive.

[0077] In this step, the first adhesive is injected by pneumatic injection, and the injection pressure of the first adhesive is V1, V1=V3+(0.1~0.5MPa), where V3 is the water pressure in the seawater where the submarine cable is located. The second adhesive is injected by pneumatic injection, and the injection pressure of the second adhesive is V2, V2=V3+(0.5~1.2MPa), where V3 is the water pressure in the seawater where the submarine cable is located.

[0078] In this step, when the first adhesive is injected into the injection cavity 25, the injection port of the first adhesive is located at the side of the injection cavity 25 away from the sea level. When the second adhesive is injected into the injection cavity 25, the injection port of the second adhesive is located at the side of the injection cavity 25 close to the sea level.

[0079] In this step, after the first adhesive is injected into the glue injection cavity 25, a first pressure-maintaining gas is transported into the glue injection cavity 25 to form a first pressure-maintaining environment, and the first pressure-maintaining environment is maintained for a first time; wherein, the gas pressure of the first pressure-maintaining gas is V4, V4=V6+(0.5~1.2MPa), wherein V6 is the water pressure in the seawater where the submarine cable is located, and the first time is 2~6min.

[0080] After the second adhesive is injected into the glue injection cavity 25, a second pressure-maintaining gas is transported into the glue injection cavity 25 to form a second pressure-maintaining environment, and the second pressure-maintaining environment is maintained for a second time. The gas pressure of the second pressure-maintaining gas is V5, V5=V6+(0.5~1.2MPa), wherein V6 is the water pressure in the seawater where the submarine cable is located, and the second time is 2~6min.

[0081] Specifically, the first adhesive is ZFG6529-00AB-02, which is a fluorosilicone rubber component, mainly including siloxane polymer, fluoride and crosslinking agent, etc.; the second adhesive is UTM1220-03AB, which is a fluorosilicone rubber component, mainly including siloxane polymer, fluoride and crosslinking agent, etc. The density of the first adhesive is 1.46~1.51g / cm 3 The density of the second adhesive is 1.28~1.30 / cm 3 Take the operating depth of the submarine cable at 20~25 meters and the seawater pressure at 0.20~0.25MPa as an example.

[0082] First, the first adhesive with low viscosity and high permeability is injected into the injection cavity 25 from bottom to top to replace the seawater and then enter the injection cavity 25. The replaced seawater is discharged from the first outlet 212, and the injection pressure is 0.4Mpa. When the first adhesive appears continuously at the first outlet 212, the first pressure-maintaining gas is injected into the injection cavity 25, and the gas pressure is 0.8MPa. The pressure-maintaining time of the first pressure-maintaining gas is 2~6min. This process prompts the first adhesive to enter and fill the gaps in the armor layer. After the pressure maintenance is completed, the second adhesive with high viscosity and low permeability is injected from top to bottom to replace the first adhesive. The injection pressure is 0.8MPa, and the replaced first adhesive is discharged from the second outlet 222, thereby improving the strength of the glue in the inner and outer layers of the injection cavity 25 to ensure the sealing effect. When the second adhesive continuously appears at the second outlet 222, the second pressure-maintaining gas is injected into the injection cavity 25. The gas pressure is 0.8 MPa. The pressure-maintaining time of the second pressure-maintaining gas is 2-6 minutes. This process reduces bubbles and holes in the second adhesive and improves the solidification quality of the second adhesive.

[0083] S6. Drain the plugging cavity 16.

[0084] In summary, the repair method 200 for underwater repair of an oil-filled submarine cable of the present application wraps the first clamp 10 around the outer periphery of the oil leakage area of ​​the submarine cable, so that the oil leakage area of ​​the submarine cable is covered by the first clamp 10, and the two ends of the first clamp 10 are closed by the first sealing structure 30 and the adhesive is injected into the glue injection cavity 25 formed by the second clamp 20 to achieve the sealing of the openings at the two ends of the first clamp 10, thereby achieving complete sealing of the sealing cavity 16 formed between the first clamp 10 and the submarine cable, preventing the insulating oil from leaking from the submarine cable, and achieving the sealing and repair of the oil leakage area of ​​the submarine cable.

[0085] Example 1 The sealing test is carried out in the ocean or in a simulated ocean environment. First, 3 kg of the first adhesive and 3 kg of the second adhesive are prepared. Among them, the first adhesive is ZFG6529-00AB-02, and its viscosity is 138 Pa·s (25°C); the second adhesive is UTM1220-03AB, and its viscosity is 520 Pa·s (25°C). Subsequently, the repair operation is completed according to the above-mentioned repair method 200 for underwater repair of oil-filled submarine cables. After testing, it was found that the sealing performance of the repaired submarine cable meets the requirements. After waiting for 48 hours to determine that the glue has solidified, a blind plate is used to seal one end of the oil-filled submarine cable, and the other end is continuously injected into the oil channel of the submarine cable through an oil injection device. The oil injection pressure is 0.8 MPa, and it is continuously observed for 72 hours, and the amount of oil leakage is counted. In this embodiment, the amount of oil leakage of the submarine cable is 0 mL, which meets the sealing requirements.

[0086] Comparative Example 1 In Comparative Example 1, no pressure-maintaining operation is performed after the first adhesive is injected to form a first pressure-maintaining environment, nor is a pressure-maintaining operation performed after the second adhesive is injected to form a second pressure-maintaining environment. The other injection methods and material preparations of Comparative Example 1 are the same as those of Example 1. After testing, it was found that the sealing performance of the repaired submarine cable could not meet the plugging requirements. After waiting for 48 hours, a blind plate was used to seal one end of the oil-filled submarine cable, and the other end was continuously injected with oil into the oil channel of the submarine cable through an oil injection device. The oil injection pressure was 0.8 MPa, and the observation was continued for 72 hours, and the amount of oil leakage was counted. The amount of oil leakage of the submarine cable in this comparative example is 609.8×10 3 mL, and the oil leakage rate is 141.2 mL / min, which does not meet the plugging requirements.

[0087] Comparative Example 2 When injecting the first adhesive in Comparative Example 2, the injection pressure was 0.3MPa, and when injecting the second adhesive, the injection pressure was 0.6MPa. The other injection methods and material preparations of Comparative Example 2 are the same as those of Example 1. Due to the low gas pressure, the glue cannot fully enter the armor. The test results show that the plugging requirements cannot be met. After waiting for 48 hours, a blind plate was used to seal one end of the oil-filled submarine cable, and the other end was continuously injected into the oil channel of the submarine cable through an oil injection device. The oil injection pressure was 0.8MPa, and the observation was continued for 72 hours, and the oil leakage was counted. The oil leakage of the submarine cable in this comparative example is 303.8×10 3 mL, and the oil leakage rate is 70.3 mL / min, which does not meet the plugging requirements.

[0088] Comparative Example 3 When injecting the first adhesive in Comparative Example 3, the injection pressure is 0.7MPa, and when injecting the second adhesive, the injection pressure is 1.0MPa. The other injection methods and material preparations of Comparative Example 3 are the same as those of Example 1. Due to the high gas pressure, the glue flows too fast and cannot meet the requirements. When the glue was injected into the shell, it was found that the glue flow rate was too fast, resulting in the glue in the first agitator and the second agitator being used too quickly. Eventually, the gas entered the inside of the fixture, forming a cavity, resulting in the failure of the injection. Among them, the first agitator is used to stir the first adhesive, and the first adhesive after stirring is transported from the first agitator to the inside of the fixture. The second agitator is used to stir the second adhesive, and the second adhesive after stirring is transported from the second agitator to the inside of the fixture. After waiting for 48 hours, a blind plate is used to seal one end of the oil-filled submarine cable, and the other end is continuously injected into the oil channel of the submarine cable through the oil injection equipment. The oil injection pressure is 0.8MPa, and the observation is continued for 72 hours, and the oil leakage is counted. The oil leakage of the submarine cable in this comparative example is 915.2×10 3 mL, and the oil leakage rate is 211.9 mL / min, which does not meet the plugging requirements.

[0089] In the above, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A method for underwater repair of an oil-filled submarine cable, characterized in that: The steps include: Wrapping a first clamp around the outer periphery of the oil leakage area of ​​the submarine cable to form a plugging cavity between the submarine cable and the first clamp; Installing a second clamp at both ends of the first clamp, and wrapping the second clamp around the outer circumference of the submarine cable to form a glue injection cavity between the submarine cable and the second clamp; A first adhesive is first injected into the glue injection cavity, and after the first adhesive is injected, a second adhesive is injected into the glue injection cavity after a first time interval, wherein the viscosity of the first adhesive is less than that of the second adhesive.

2. The method for underwater repair of an oil-filled submarine cable according to claim 1, characterized in that: The first adhesive is injected by pneumatic injection, and the injection pressure of the first adhesive during injection is V1, V1=V3+(0.1~0.5MPa), wherein V3 is the water pressure in the seawater where the submarine cable is located.

3. The repair method for underwater repair of oil-filled submarine cables according to claim 1, characterized in that: The second adhesive is injected by pneumatic injection, and the injection pressure of the second adhesive during injection is V2, V2=V3+(0.5~1.2MPa), wherein V3 is the water pressure in the seawater where the submarine cable is located.

4. The repair method for underwater repair of oil-filled submarine cables according to claim 1, characterized in that: When the first adhesive is injected into the adhesive injection cavity, the injection port of the first adhesive is located at a side of the adhesive injection cavity away from the sea level; When the second adhesive is injected into the adhesive injection cavity, the injection port of the second adhesive is located at a side of the adhesive injection cavity close to the sea level.

5. The method for underwater repair of an oil-filled submarine cable according to claim 1, characterized in that: After the first adhesive is injected into the glue injection cavity, a first pressure-maintaining gas is transported into the glue injection cavity to form a first pressure-maintaining environment, and the first pressure-maintaining environment is maintained for the first time; The gas pressure of the first pressure-maintaining gas is V4, V4=V6+(0.5-1.2 MPa), wherein V6 is the water pressure in the seawater where the submarine cable is located, and the first time is 2-6 minutes.

6. The method for underwater repair of an oil-filled submarine cable according to claim 1, characterized in that: After the second adhesive is injected into the glue injection cavity, a second pressure-maintaining gas is transported into the glue injection cavity to form a second pressure-maintaining environment, and the second pressure-maintaining environment is maintained for a second time; The gas pressure of the second pressure-maintaining gas is V5, V5=V6+(0.5~1.2MPa), wherein V6 is the water pressure in the seawater where the submarine cable is located, and the second time is 2~6min.

7. A repair device for underwater repair of oil-filled submarine cables, characterized in that: include: A first clamp, which is configured to be wrapped around the outer circumference of the submarine cable, and a sealing cavity is formed between the first clamp and the submarine cable; A second clamp is configured to be wrapped around the outer circumference of the submarine cable, the two ends of the first clamp are respectively provided with the second clamp connected thereto, a glue injection cavity is formed between the second clamp and the submarine cable, the glue injection cavity is configured to contain glue, and the glue is configured to close the openings at both ends of the blocking cavity; The second sealing structure is detachably connected to an end of the second clamp away from the first clamp, and the second sealing structure is configured to close an end of the glue injection cavity away from the first clamp.

8. The repair device for underwater repair of oil-filled submarine cables according to claim 7, characterized in that: The first clamp has first sealing grooves at both ends thereof, the first sealing grooves are connected to the blocking cavity, and the second clamp has a third sealing groove at one end thereof close to the first clamp, the third sealing groove is connected to the glue injection cavity; The repair device for underwater repair of oil-filled submarine cables also includes a first sealing structure, wherein a portion of the first sealing structure is disposed in the first sealing groove, and another portion of the first sealing structure is disposed in the third sealing groove.

9. The repair device for underwater repair of oil-filled submarine cables according to claim 7, characterized in that: A second sealing groove is formed at one end of the second fixture away from the first fixture, the second sealing groove is connected to the glue injection cavity, and the second sealing structure is at least partially located in the second sealing groove.

10. The repair device for underwater repair of oil-filled submarine cables according to claim 7, characterized in that: The first clamp comprises a first upper clamp and a first lower clamp, the first upper clamp is connected to the first lower clamp, and the first upper clamp and the first lower clamp together form a first receiving cavity, and the first receiving cavity is for the submarine cable to pass through; and / or, The second clamp comprises a second upper clamp and a second lower clamp, the second upper clamp is connected to the second lower clamp, and the second upper clamp and the second lower clamp together form a second receiving cavity, and the second receiving cavity is for the submarine cable to pass through.

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