JP2006333674A - Repair tool for oil leaked portion of of cable, and repairing method of oil leaked portion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute so that anyone may repair an oil leaked portion of an OF cable with ease for a short time. <P>SOLUTION: A repair tool 1 includes an oil blocking sheet 2 and a tightening belt 12. The oil blocking sheet has elasticity, and includes a nearly rectangular base portion 3, and an annular rib 4 comprising side portions 5, 6, 7, 8, 9, 10 to surround the oil leaked portion which are provided at one face of the base portion 3. Cross sections of each side portion 5, 6, 7, 8, 9, 10 of the annular rib 4 have a trapezoid shape which becomes wider as estranged from the base portion 3. A pair of gusset plates 15 are arranged at a position overlapped with a pair of the side portions 5, 7 of the annular rib 4, and the tightening belt 12 is arranged at a position overlapped with the remained side portions 6, 8, 9, 10. The oil blocking sheet 2 is arranged on the oil leaked portion of the OF cable so that the gusset plates 15 may be parallel with the OF cable, and that the oil leaked portion may be surrounded by the annular rib 4, then the oil blocking sheet 2 is fixed using the tightening belt 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil leakage spot repair tool for an OF cable (oil-immersion power cable) and an oil leakage spot repair method using the repair tool.

  The OF cable is composed of a cable core composed of an insulating layer and a blocking layer formed by winding an oil passage, a conductor, and insulating paper several hundred times, and a metal sheath such as a corrugated aluminum sheath or a lead sheath covering the cable core. And an anticorrosion layer such as polyethylene or polyvinyl chloride formed on the outer periphery of the metal sheath. The oil passage and the insulating layer are impregnated or filled with an insulating oil such as a mineral oil-based insulating oil or an alkylbenzene-based insulating oil. And the oil pressure adjustment tank installed outside constantly applies the oil pressure above the atmospheric pressure to the insulating oil in the cable, the generation of voids in the insulating oil due to the temperature change is suppressed, and the insulation deterioration is prevented. ing. Such an OF cable is suitable as a power cable having an extra high voltage or higher and has been widely used by being laid underground or on the seabed.

  By the way, after laying the OF cable, a small hole or a crack may be formed in the metal sheath and the anticorrosion layer due to corrosion of the metal or an unexpected accident, and the insulating oil may leak from the damaged portion. is there. In such a case, there is a risk of causing insulation breakdown due to insufficient insulation oil, or even contaminating the environment near the damaged part. It is necessary to repair parts and take measures against contamination.

  For repairing the oil leaking part of the OF cable, Japanese Utility Model Publication No. 2-37530 (Patent Document 1) applies a high tension rubber / plastic tape with good oil resistance on the outer periphery of the cracked part of the lead cover of the OF cable. The method of repairing by providing a temporary oil-stopping layer by laminating a winding layer of glass fiber tape and an epoxy resin layer thereon to provide an oil-stopping layer is disclosed. It would be possible to apply measures similar to those disclosed on the anticorrosion layer as well as on the metal sheath.

  Japanese Patent Laid-Open No. 2000-341820 (Patent Document 2) discloses that a lead sheath is formed at a position where the metal sheath anticorrosive layer including the oil leakage portion of the OF cable is peeled off within a required range and the oil leakage location on the exposed metal sheath is sandwiched. A lead with a diameter greater than the outer diameter of the metal sheath is placed around the base, and a metal plate to which two connectors are attached is mounted as a tube by rolling it into a cylindrical shape across both bases. After joining both ends of the tube and the pedestal over the entire circumference by lead work, after joining the joints of the pipe by lead work or welding, after vacuuming from the one connector and lubricating from the other connector A method for repairing an oil leakage point in an OF cable is disclosed.

Japanese Utility Model Publication No. 02-37530 JP 2000-341820 A

  However, according to the method disclosed in Japanese Utility Model Laid-Open No. 02-37530, the oil leakage portion can be repaired in a relatively short time, but as described above, a hydraulic pressure higher than the atmospheric pressure is always applied to the insulating oil. Insulation oil continues to leak during repair, so that a certain level of skill is required to wind the rubber / plastic tape and glass fiber tape satisfactorily so as to completely stop the leakage. For this reason, repairs may be requested to a skilled worker, but in this case, a certain amount of time is required until the repair is completed. Concerned. In addition, it is economically disadvantageous because the power must be interrupted until the repair is completed. Furthermore, when all of the insulating oil has flowed out of the OF cable before the repair start, the entire OF cable must be replaced.

  Further, according to the method disclosed in Japanese Utility Model Laid-Open No. 02-37530, a solid repair structure is formed. However, since a lead work requires special skills, a dedicated worker needs to be dispatched. Therefore, in this case as well, it takes a long time to complete the repair, and problems such as environmental pollution due to outflow of insulating oil and problems of economic adverse effects due to prolonged power failure and replacement of the entire OF cable occur. Moreover, since fire is used for stripping the metal sheath anticorrosive layer and lead work, the work at the site where combustibles are present is very dangerous.

  Accordingly, an object of the present invention is to provide a repair tool that enables anyone to perform repair work in an emergency in a short time when oil leakage from the OF cable occurs, and to use this repair tool. This is to provide a method for repairing an oil leakage location that can be completed urgently in a short time.

  The inventors of the present invention have the above-mentioned problems in that an oil shielding sheet is disposed on the oil leakage portion of the OF cable, and at least one tightening for fixing the oil shielding sheet on the OF cable around the OF cable. An oil leakage spot repair tool for an OF cable including a belt, wherein the oil blocking sheet is made of an elastic material and surrounds a plate-like base portion and an oil leakage location provided on the inner surface of the base portion. At least one annular rib, and the annular rib is substantially flat and is inclined in the direction toward the inner side of the ring as it is away from the base and a contact end surface formed substantially parallel to the inner surface of the base. An inner peripheral surface and an outer peripheral surface that is perpendicular to the base portion or is inclined in the direction of the outer side of the ring as it is away from the base portion, and the at least one fastening belt is the oil blocking sheet. Inside of the base as well A repair tool arranged at a position overlapping at least one part of the annular rib on the outer surface, and a method of repairing an oil leakage point of an OF cable with the repair tool, wherein The sheet is arranged so that the inner surface of the base portion faces the OF cable and the oil leakage portion is surrounded by any of the annular ribs, and then the at least one fastening belt is wrapped around the OF cable and tightened. It has been found that this can be achieved by a method in which the oil blocking sheet is pressed against the surface of the OF cable by an attached belt.

  In the present invention, the “inner surface” of the base portion of the oil blocking sheet refers to the surface on which the annular rib is provided, and the “outer surface” of the base portion refers to the surface on which the annular rib is not provided. In addition, the “contact end face” of the annular rib refers to a face that comes into contact with the surface of the OF cable when the oil blocking sheet is disposed on the oil leakage portion of the OF cable, and the “inner peripheral face” of the annular rib. The surface of the annular rib that faces toward the center of the ring, and the “outer peripheral surface” of the annular rib refers to the surface of the annular rib that faces toward the outside of the ring. .

  Further, the oil blocking sheet in the repair tool of the present invention may be provided with only one annular rib or may be provided with two or more. The shape of the ring of the annular rib may be any shape such as a circle, a triangle, or a quadrangle. When two or more annular ribs are provided, the two annular ribs may be combined to include a common portion, and in this case, the annular ribs are all “annular ribs”. . In this case, the “inner peripheral surface” of the annular rib includes all side surfaces facing the center of the ring when any of the annular ribs is considered. The size of the ring of each annular rib is a size that can cover at least the entire oil leakage location so that the oil leakage location can be enclosed within the annular rib. The contact end surfaces of the respective annular ribs are substantially flat and formed substantially parallel to the inner surface of the base portion, and the inner peripheral surface of each annular rib is inclined in the direction toward the inner side of the ring as the distance from the base portion increases. The outer peripheral surface of each annular rib is either perpendicular to the base or inclined toward the outside of the ring as it moves away from the base. That is, the cross-sections of the annular ribs all have a trapezoidal shape that widens with distance from the base.

  In the present invention, since the oil blocking sheet is made of an elastic material, the oil blocking sheet is bent and disposed along the surface of the OF cable when covering the oil leakage portion of the OF cable, and is tightened. Since the attached belt is arranged at a position overlapping at least one part of the annular rib on the inside or the outer surface of the base of the oil shielding sheet, when the oil shielding sheet is fixed on the OF cable, the oil is applied by the force of the tightening belt. The contact end face of the annular rib of the shielding sheet is strongly pressed against the surface of the OF cable. Since the annular rib has elasticity, the contact end surface of the annular rib is deformed by the force of the tightening belt and is brought into close contact with the surface of the OF cable. Furthermore, since the cross-section of the annular rib has a trapezoidal shape that spreads away from the base, if the oil leakage location is surrounded by this annular rib, the inside of the annular rib is filled with insulating oil that continues to leak, and eventually The hydraulic pressure of the insulating oil acts on the inner peripheral surface of the annular rib, so that the contact end surface of the annular rib is pressed more strongly against the surface of the OF cable. Therefore, at least the amount of oil leakage can be significantly reduced, or the oil leakage can be stopped completely. Moreover, it is only necessary to place an oil blocking sheet on the oil leakage point of the OF cable and fix it with a tightening belt, so that no skill is required, and if an oil leak occurs, anyone in an emergency can easily and quickly Repair work can be completed on time.

  The material constituting the oil shielding sheet is not particularly limited as long as it has elasticity and has resistance to the insulating oil filled in the OF cable when the OF cable is repaired. Depending on the material of the anticorrosion layer and the smoothness of the surface, the surface of the OF cable and the contact end surface of the annular rib can be appropriately selected. For example, use styrene-butadiene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, chloroprene rubber, acrylic rubber, epichlorohydrin rubber, urethane rubber, polysulfide rubber, silicone rubber, hydrogenated nitrile rubber, fluorine rubber, etc. However, it is preferable to use chloroprene rubber, nitrile rubber, fluorine rubber, chlorosulfonated polyethylene, or urethane rubber because good durability is ensured.

  The angle between the inner surface of the base of the oil blocking sheet and the inner peripheral surface of the annular rib is such that the contact end surface of the annular rib is the surface of the OF cable due to the force of the tightening belt and the hydraulic pressure of the leaked insulating oil when repairing the OF cable It is selected so as to sufficiently obtain the effect of being pressed against the cable, and depends on the circumference of the OF cable, but is preferably in the range of 20 to 60 °. Further, the distance between the inner surface of the base portion of the oil blocking sheet and the contact end surface of the annular rib is such that when the OF cable is repaired, the contact end surface of the annular rib is the surface of the OF cable by the force of the tightening belt and the hydraulic pressure of the leaked insulating oil It is selected so as to obtain a sufficient effect of being pressed onto the cable, and depends on the circumference of the OF cable, but is preferably in the range of 3 to 10 mm.

  The fastening belt in the repair tool of the present invention is not particularly limited as long as it can fix the oil blocking sheet disposed on the oil leakage portion of the OF cable against the hydraulic pressure of the leaked insulating oil, and is not limited to resin or metal However, it is preferable to use a belt made of stainless steel because the oil shielding sheet can be pressed and fixed onto the OF cable with sufficient force and durability is sufficient. The length of the tightening belt must be at least longer than the circumference of the OF cable so that it can wrap around the OF cable, but the width can vary widely. When fixing the oil shut-off sheet on the OF cable with one tightening belt, it is possible to use a wide tightening belt, and using two or more narrow tightening belts, The oil blocking sheet may be fixed on the OF cable at a location. Even in this case, the width of the fastening belt is preferably wider than the width of the contact end face of the annular rib. The fastening belt may have a net-like structure.

  A fastener is preferably attached to the end of the fastening belt in advance. The type of the fastener is not particularly limited as long as the oil shielding sheet can be fixed sufficiently strongly on the OF cable. However, when the ratchet mechanism fastener is provided, the oil shielding sheet This is preferable because it can be simply fixed while strongly pressing on the OF cable.

  In the present invention, the tightening belt may be separated from the oil blocking sheet and may be connected in advance to a position overlapping with at least one part of the annular rib on the inside or the outer surface of the base of the oil blocking sheet. It is preferable that the connection is made in advance because the repair work is further simplified. When connected, a part of the fastening belt may be enclosed inside the base of the oil shielding sheet, or may be attached to the outer surface of the annular rib with an adhesive, or A tightening belt mounting portion may be provided in advance from the outer surface to the inside of the base portion when the oil blocking sheet is formed, and the tightening belt may be mounted on the mounting portion.

  In a preferred embodiment of the present invention, the base of the oil shielding sheet has a substantially rectangular shape, and one of the at least one annular rib of the oil shielding sheet is along the edge of the substantially rectangular base. It is a substantially rectangular annular rib having four sides provided. In this embodiment, a pair of opposing sides of the annular rib are arranged in parallel with the axis of the OF cable. And a fastening belt is arrange | positioned in the position which overlaps with a pair of side part arrange | positioned so that it may extend in the circumferential direction of the remaining OF cable. In this case, one wide fastening belt may be arranged at a position overlapping both of the pair of sides, and each of the two narrow fastening belts may be arranged with each of the pair of sides. You may arrange | position in the position which overlaps. In this embodiment, the oil blocking sheet is easily arranged on the OF cable, and the force of the tightening belt acts on the entire side of the annular rib located at both ends of the oil blocking sheet, and the entire contact end surface of the side Is surely pressed against the surface of the OF cable, and the leakage of the insulating oil to the outside of the annular rib is more easily prevented.

  The oil blocking sheet having the above-described substantially rectangular base and the substantially rectangular annular rib on the edge of the base further includes a pair of opposed sides of the substantially rectangular annular rib on the inside or the outer surface of the oil blocking sheet. It is also possible to provide a pair of reinforcing plates at positions overlapping with each other and to arrange the pair of reinforcing plates in parallel with the axis of the OF cable. However, at the position where the fastening belt and the reinforcing plate intersect, the reinforcing plate is located between the fastening belt and the annular rib. The reinforcing plate may be sealed inside the base portion of the oil shielding sheet, or may be affixed on the outer surface of the annular rib with an adhesive, or the inner side from the outer surface of the base portion in advance when the oil shielding sheet is molded. Alternatively, a reinforcing plate mounting portion may be provided, and the reinforcing plate may be mounted on the mounting portion.

  When the oil shielding sheet is fixed on the OF cable by the tightening belt, the reinforcing plate is also pushed to the OF cable side by the force of the tightening belt, and therefore the reinforcing plate is arranged in parallel with the axis of the annular cable of the annular rib. This has the effect of pressing the entire contact end surface of the side portion against the surface of the OF cable. Therefore, the entire contact end surface of the substantially rectangular annular rib comes into close contact with the OF cable surface by the action of the tightening belt and the reinforcing plate, and the leakage of insulating oil to the outside of the annular rib is further prevented more reliably. Is done.

  The material constituting the reinforcing plate is not particularly limited as long as it has rigidity that can withstand the hydraulic pressure of the insulating oil and the force of the tightening belt, and an elongated metal plate is generally used. In particular, the use of an iron or steel plate is preferable because the contact end surface of the annular rib can be pressed against the surface of the OF cable with sufficient force, and the durability is sufficient. The length of the reinforcing plate is preferably equal to or slightly longer than the length of the side portion to be arranged in parallel with the axis of the OF cable having the substantially rectangular annular rib.

  In this embodiment, when the length of the edge arranged so as to extend in the circumferential direction of the OF cable in the substantially rectangular base is set to 1/3 to 1 times the circumferential length of the OF cable, This is preferable because a sufficient oil blocking effect can be obtained. If a plurality of types of oil blocking sheets having different edge lengths are prepared in advance and the oil blocking sheet to be applied is selected according to the circumference of the OF cable to be repaired, the repair can be further smoothly advanced. Therefore, it is preferable.

  The oil blocking sheet having the substantially rectangular base portion has a side portion that should be arranged so as to extend in the circumferential direction of the OF cable, in addition to the substantially rectangular annular rib provided along the edge of the base portion. When the annular rib is further provided, the fastening belts can be respectively disposed at positions overlapping these side portions. Furthermore, when it has further the cyclic | annular rib which has a side part which should be arrange | positioned in parallel with the axis | shaft of OF cable, an additional reinforcement board can also be provided in the position which overlaps these side parts. By these forms, the leakage of the insulating oil to the outside of the oil blocking sheet is more reliably prevented.

  According to the present invention, when oil leakage of the OF cable occurs, the oil blocking sheet in the repair tool of the present invention is arranged such that the inner surface of the base portion faces the OF cable side and any of the annular ribs Next, at least one fastening belt is wrapped around the OF cable, and the oil shielding sheet is fixed to the OF cable by pressing it onto the OF cable. Since the contact end face of the annular rib having a specific shape is strongly pressed against the surface of the OF cable, anyone can repair the oil leakage point easily and in a short time, and no skill in repair work is required. Therefore, the power failure time for repairing the oil leakage location can be shortened. Moreover, since the repair can be completed in an urgent and short time before all of the insulating oil leaks from the OF cable, it is not necessary to replace the OF cable. Therefore, the present invention has a very advantageous effect economically. In addition, since the oil leakage point can be repaired without using fire, the repair can be performed safely.

  Hereinafter, although the present invention is explained in detail, referring to drawings, the present invention is not limited to the following embodiments.

(Embodiment 1)
FIG. 1 is a schematic view showing a repair tool 1 according to a basic embodiment of the present invention. The repair tool 1 according to the present embodiment includes a substantially square annular rib 4 having a substantially square base 3 and four side parts 5, 6, 7, 8 provided along the edge of the base 3. The oil blocking sheet 2 and two tightening belts 12 arranged in parallel to both ends of the oil blocking sheet 2 are configured.

  The oil shielding sheet 2 only needs to be made of an elastic material that can withstand insulating oil. Depending on the material of the anticorrosion layer of the OF cable to be repaired and the smoothness of the surface, the surface of the OF cable and the annular rib It is possible to select such that the contact end face can be sufficiently adhered. When chloroprene rubber, nitrile rubber, fluorine rubber, chlorosulfonated polyethylene, or urethane rubber is used, good durability can be obtained.

  The oil blocking sheet 2 includes a substantially square flat base 3. Considering the circumference of the OF cable to be repaired, the length of the substantially square edge is set to 1/3 to 1 times the circumference. The thickness of the base 3 is selected so as to withstand the hydraulic pressure of the insulating oil leaked during repair of the OF cable, which will be described later, and depends on the material constituting the seat 2 and the diameter of the OF cable to be repaired. Is set in the range of 1 to 5 mm. And the square annular rib 4 which has the four side parts 5, 6, 7, 8 provided along the edge of the base 3 is provided in the single side | surface (inner surface) of the base 3 of the oil shielding sheet 2. As shown in FIG. Yes.

  FIG. 2A shows a cross section when the oil blocking sheet 2 is cut along the line AA in FIG. 1, and FIG. 2B shows the oil blocking sheet 2 along the line BB in FIG. The cross section when cut is shown.

  In FIG. 2A, the side portions 5 and 7 of the annular rib are inclined in the direction of the inner side of the ring as they are separated from the contact end surfaces 5a and 7a that are substantially flat and substantially parallel to the inner surface of the base portion. Inner peripheral surfaces 5b and 7b, and outer peripheral surfaces 5c and 7c that are perpendicular to the inner surface of the base portion or are inclined in the direction of the outer side of the ring as they move away from the base portion. Therefore, the cross-section of the side portions 5 and 7 of the annular rib has a trapezoidal shape that widens as the distance from the base portion 3 increases.

  In FIG. 2 (b), the side portions 6 and 8 of the annular rib are substantially flat and end faces 6a and 8a that are substantially parallel to the surface of the base portion, and are inclined in the direction toward the inner side of the ring as they move away from the base portion. Peripheral surfaces 6b and 8b and outer peripheral surfaces 6c and 8c that are inclined in the direction of the outer side of the ring as they are separated from the base. Therefore, the cross-sections of the side portions 6 and 8 of the annular rib also have a trapezoidal shape that widens with distance from the base portion 3. A symbol 11 indicates a tightening belt mounting portion for mounting a tightening belt 12 described later. The fastening belt mounting portion 11 is provided at a position overlapping the side portions 6 and 8 of the annular rib from the outer surface to the inside of the base portion 3.

  The detailed shape of the annular rib 4 is such that the contact end surface of the annular rib is sufficiently pressed against the surface of the OF cable by the force of the fastening belt 12 and the hydraulic pressure of the leaked insulating oil when the OF cable is repaired. Depending on the circumference of the OF cable.

  The angle between the inner surface of the base 3 and the inner peripheral surfaces 5b, 6b, 7b, 8b of the annular rib 4 is preferably in the range of 20 to 60 °. The angles between the inner surface of the base 3 and the inner peripheral surfaces 5b, 6b, 7b, and 8b of the annular rib 4 do not have to be the same, but if they are the same, the force applied by the tightening belt 20 when repairing the OF cable Further, the effect that the contact end surface of the annular rib 4 is pressed against the surface of the OF cable by the hydraulic pressure of the leaked insulating oil is preferable. The angle between the inner surface of the base 3 and the outer peripheral surfaces 5c, 6c, 7c, 8c of the annular rib 4 is not so important, but is generally set in the range of 20 to 90 °. The angle between the inner surface of the base 3 and the inner peripheral surfaces 5b, 6b, 7b, 8b of the annular rib 4 and the angle between the inner surface of the base 3 and the outer peripheral surfaces 5c, 6c, 7c, 8c of the annular rib 4 are the same. There is no need.

  The length between the inner surface of the base 3 and the contact end surfaces 5a, 6a, 7a, 8a of the annular rib 4 is equal, and is generally set in the range of 3 to 10 mm. The width of the contact end faces 5a, 6a, 7a, 8a of the annular rib 4 is selected so that sufficient contact between the contact end faces 5a, 6a, 7a, 8a of the annular rib 4 and the surface of the OF cable is obtained. Is in the range of 6-25 mm.

  The fastening belt 12 in the repair tool 1 according to the present embodiment is made of a material capable of stably fixing the oil blocking sheet 2 disposed on the oil leakage portion of the OF cable against the hydraulic pressure of the leaked insulating oil. However, good durability can be obtained by using a stainless steel belt. The length of the fastening belt 12 is set to a length sufficient to go around the circumference of the OF cable to be repaired. The width is set to be equal to or slightly wider than the width of the contact end faces 6a, 8a of the annular rib 4. In the present embodiment, a fastener is attached to the end of the fastening belt 12, but it is preferable that the fasteners of the ratchet mechanisms 13, 13 'are provided. The central portion of the tightening belt 12 is inserted in advance into the tightening belt mounting portion 11 shown in FIG. After mounting, it may be sealed with a rubber sealant.

  FIG. 3 shows the oil leakage location 22 of the OF cable 20. Since oil pressure equal to or higher than atmospheric pressure is always applied to the insulating oil 23 in the cable, the insulating oil 23 is ejected from the oil leakage location 22.

  In order to repair the oil leakage point 22 of the OF cable 20, first, as shown in FIG. 4, the oil blocking sheet 2 is arranged so that the inner surface of the base portion 3 faces the surface 21 of the OF cable 20 and the annular rib 4. The side portions 5 and 7 are arranged so as to be parallel to the axis of the OF cable 20. At this time, it arrange | positions paying attention so that the oil leak location 22 may be enclosed by the annular rib 4. FIG. Next, the two fastening belts 12 connected in advance to the oil shielding sheet 2 are made to circulate around the OF cable 20, and the oil shielding sheet 2 is attached to the OF cable using the ratchet mechanisms 13 and 13 ′ of the fastening belt 12. Tightly press onto the surface 21 of the 20. At this time, the contact end surfaces 6 a and 8 a of the side portions 6 and 8 of the annular rib 4 of the oil blocking sheet 2 are strongly pressed against the surface 21 of the OF cable 20 by the force of the fastening belt 12. The contact end surfaces 5 a and 7 a of the side portions 5 and 7 of the annular rib 4 are also strongly pressed against the surface 21 of the OF cable 20 indirectly by the force of the fastening belt 12.

  FIG. 5 shows a cross section of the oil leakage point 22 of the OF cable 20 after repair. As shown in FIG. 5A, the inside of the annular rib 4 is filled with insulating oil 23 that continues to be ejected. And since the cross section of the annular rib 4 of this Embodiment has the trapezoid shape which spreads as it leaves | separates from the base 3, finally, as shown by the arrow in FIG.5 (b), the hydraulic pressure of the insulating oil 23 is shown. Acts on the inner peripheral surfaces 5b, 6b, 7b, 8b of the annular rib 4, so that the contact end surfaces 5a, 6a, 7a, 8a are pressed more strongly against the surface 21 of the OF cable 20. Therefore, oil leakage can be stopped, and anyone can complete repair work easily and in a short time.

(Embodiment 2)
Next, a repair tool according to another embodiment of the present invention will be described. In the following description and drawings, the same parts as those in FIGS.

  FIG. 6 is a schematic view showing a repair tool 1 according to another embodiment of the present invention. The repair tool 1 according to the present embodiment includes an oil blocking sheet 2 having a substantially rectangular base 3 and a plurality of annular ribs 4 provided on one side of the base 3, and 4 arranged in parallel to the oil blocking sheet 2. This is constituted by a book tightening belt 12.

  The length of the short side of the substantially rectangular flat base 3 of the oil blocking sheet 2 in the repair tool 1 of the present embodiment is set to 1/3 to 1 times the circumference of the OF cable to be repaired. The long side is arranged parallel to the axis of the OF cable.

  In the present embodiment, a substantially rectangular annular rib 4 having four side parts 5, 6, 7, 8 provided on one side (inner surface) of the base part 3 of the oil blocking sheet 2 along the edge of the base part 3. In addition, side portions 9 and 10 parallel to the side portions 6 and 8 are further provided between the side portions 6 and 8. In this embodiment, in addition to the substantially rectangular annular rib provided on the edge of the base portion constituted by the side portions 5, 6, 7, 8, the side portions 5-1, 6, 7-1, 9 are configured. An annular rib composed of side portions 5-2, 9, 7-2, 10 and an annular rib composed of side portions 5-3, 10, 7-3, 8 The annular ribs composed of the sides 5-1 + 5-2, 6, 7-1 + 7-2, 10 are also the annular ribs composed of the sides 5-2 + 5-3, 9, 7-2 + 7-3, 8. All the ribs are also annular ribs 4. And each of the annular ribs 4 having the smallest ring size (annular ribs composed of side portions 5-1, 6, 7-1, 9 and side portions 5-2, 9, 7-2, 10) Even in the case of the annular rib constituted, the annular rib constituted by the sides 5-3, 10, 7-3, and 8), the size of the ring is the whole of the oil leakage portion (generally a diameter of 3 cm or less) Large enough to cover small holes or cracks).

  7A shows a cross section when the oil blocking sheet 2 is cut along the line AA in FIG. 6, and FIG. 7B shows the oil blocking sheet 2 along the line BB in FIG. The cross section when cut is shown.

  In FIG. 7A, the side portions 5 and 7 of the annular rib 4 are substantially flat and end faces 5a and 7a that are substantially parallel to the surface of the base portion, and incline toward the inner side of the ring as they move away from the base portion. Inner peripheral surfaces 5b and 7b and outer peripheral surfaces 5c and 7c that are inclined in the direction of the outer side of the ring as they are separated from the base. Therefore, the cross sections of the side portions 5 and 7 of the annular rib 4 have a trapezoidal shape that widens as the distance from the base portion 3 increases. Reference numeral 14 denotes a reinforcing plate mounting portion for mounting the reinforcing plate 15.

  The reinforcing plate mounting portion 14 is provided at a position overlapping the side portions 5 and 7 of the annular rib from the outer surface to the inside of the base portion 3. The reinforcing plate 15 is made of a material having rigidity that can withstand the hydraulic pressure of the insulating oil and the force of the fastening belt. If an elongated plate of iron or steel is used, the contact end surface of the annular rib is connected to the OF cable. It can be pressed against the surface with sufficient force. The reinforcing plate 15 may be sealed with a rubber-based sealing material after being mounted on the reinforcing plate mounting portion 14. The length of the repair material 15 is preferably slightly longer than the length of the side portions 5 and 7, as shown in FIG. 6, and the width is set to be equal to or slightly wider than the width of the contact end surfaces 5a and 7a of the annular rib 4. It is preferable.

  In FIG. 7B, the side portions 6, 8, 9, and 10 of the annular rib have contact end surfaces 6a, 8a, 9a, and 10a that are substantially flat and substantially parallel to the surface of the base portion. In the present embodiment including a plurality of annular ribs 4, all the side surfaces facing the center of the ring when any one of the annular ribs 4 is considered are “inner circumferential surfaces”. Therefore, in this embodiment, the side portions 6, 8, 9, and 10 of the annular rib are inclined to the inner circumferential surfaces 6b, 9b-1, 9b-2, 10 b-1, 10 b-2, 8 b and outer peripheral surfaces 6 c, 8 c that are inclined in the direction of the outer side of the ring as they are separated from the base 3. Therefore, the cross sections of the side portions 6, 8, 9, and 10 of the annular rib 4 have a trapezoidal shape that widens as the distance from the base portion 3 increases.

  As shown in FIG. 6, the repair tool 1 of the present embodiment further includes four fastening belts 12, and each fastening belt 12 includes four parallel side portions 6, 8, 8 on the outer surface of the base portion. 9 and 10 are preliminarily fixed to the position overlapping with the adhesive.

  In order to repair the oil leakage point 22 of the OF cable 20, as shown in FIG. 8, first, the oil blocking sheet 2 is placed so that the inner surface of the base 3 faces the surface 21 of the OF cable 20 and the annular rib 4 The side portions 5 and 7 are arranged so as to be parallel to the axis of the OF cable 20. At this time, it arrange | positions paying attention so that the oil leak location 22 may be enclosed by either of the annular ribs 4 (in the figure, the annular rib comprised of sides 5-2, 9, 7-2, 10). To do. Next, four fastening belts 12 connected in advance to the oil shielding sheet 2 are circulated around the OF cable 20, and the oil shielding sheet 2 is attached to the OF cable using the ratchet mechanisms 13 and 13 ′ of the fastening belt 12. It fixes so that it may press on the surface 21 of 20. FIG. At this time, the contact end surfaces 6 a, 8 a, 9 a, 10 a of the side portions 6, 8, 9, 10 of the annular rib 4 of the oil blocking sheet 2 are strongly pressed against the surface 21 of the OF cable 20 by the force of the tightening belt 12. The contact end surfaces 5 a and 7 a of the side portions 5 and 7 of the annular rib 4 are also strongly pressed against the surface 21 of the OF cable 20 by the reinforcing plate 15 pressed by the force of the fastening belt 12. Therefore, oil leakage can be stopped, and anyone can complete repair work easily and in a short time.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment. For example, in the above embodiment, a narrow fastening belt is disposed on each side of the annular rib, but the oil blocking sheet may be fixed on the OF cable by a single wide fastening belt. . The fastening belt may have a net-like structure. Further, the shape of the ring of the annular rib is not limited to a rectangle, and may be any shape such as a circle, a triangle, a quadrangle, or a combination thereof. For example, in FIG. 1, a circular annular rib may be provided inside the substantially square annular rib 4, and in FIG. 6, a side part parallel to the side parts 5 and 7 and connecting the side parts 6 and 8 is additionally provided. It is good also as a grid | lattice-like rib. And you may install a reinforcement board in the position which overlaps with the side part provided additionally.

It is the schematic which shows the repair tool of the oil leak location of the OF cable of embodiment of this invention. (A) is the schematic which shows the cross section at the time of cut | disconnecting an oil cutoff sheet | seat by the AA line of FIG. 1, (b) is the cross section at the time of cutting an oil cutoff sheet | seat by the BB line of FIG. FIG. It is the schematic which shows the oil leak location of an OF cable. It is the schematic which shows the state of repair of the oil leak location of OF cable by the repair tool of embodiment of FIG. (A) is the schematic which shows the cross section of the oil leak location of OF cable after repair. (B) is a partially enlarged view. It is the schematic which shows the repair tool of the oil leak location of OF cable of another embodiment of this invention. (A) is a schematic diagram showing a cross section when the oil blocking sheet is cut along the line AA in FIG. 6, and (b) is a cross section when the oil blocking sheet is cut along the line BB in FIG. FIG. It is the schematic which shows the state of repair of the oil leak location of OF cable by the repair tool of embodiment of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Repairing tool 2 Oil block sheet 3 Base part of oil block sheet 4 Annular rib of oil block sheet 5-10 Sides constituting annular rib 11 Tightening belt mounting part 12 Tightening belt 13, 13 'Ratchet mechanism 14 Reinforcement plate mounting Part 15 Reinforcing plate 20 OF cable 21 OF cable surface 22 Oil leak location 23 Insulating oil

Claims (12)

An oil shielding sheet disposed on the oil leakage point of the OF cable;
A repair tool for an oil leakage point of the OF cable including at least one fastening belt for fixing the oil shielding sheet on the OF cable around the periphery of the OF cable,
The oil blocking sheet is made of an elastic material, and includes a flat base and at least one annular rib for enclosing an oil leakage location provided on the inner surface of the base,
The annular rib has a contact end surface that is substantially flat and substantially parallel to the inner surface of the base portion, an inner peripheral surface that is inclined in the direction of the inner side of the ring as it moves away from the base portion, and is perpendicular to the base portion. Or an outer peripheral surface that is inclined in the direction of the outer side of the ring as it is away from the base,
The at least one fastening belt is disposed at a position overlapping with at least one part of the annular rib on the inside or the outer surface of the base of the oil blocking sheet,
A repair tool characterized by that.   The repair tool according to claim 1, wherein an angle between an inner surface of a base portion of the oil blocking sheet and an inner peripheral surface of the annular rib is 20 to 60 °.   The repair tool according to claim 1 or 2, wherein a distance between an inner surface of a base portion of the oil blocking sheet and a contact end surface of the annular rib is 3 to 10 mm.   The elastic material constituting the oil blocking sheet is any one of chloroprene rubber, nitrile rubber, fluorine rubber, chlorosulfonated polyethylene, and urethane rubber, according to any one of claims 1 to 3. The repair tool described. The base of the oil blocking sheet has a substantially rectangular shape;
One of the at least one annular rib is a substantially rectangular annular rib having four sides provided along an edge of the substantially rectangular base portion;
A pair of opposing sides of the annular rib are arranged parallel to the axis of the OF cable;
The fastening belt is arranged at a position overlapping with a pair of sides arranged so as to extend in the circumferential direction of the remaining OF cable, according to any one of claims 1 to 4. Repair tool. The substantially rectangular oil shielding sheet further includes a pair of reinforcing plates at a position overlapping a pair of opposing sides of the substantially rectangular annular rib on the outer surface or the base of the oil shielding sheet. ,
The pair of reinforcing plates are arranged parallel to the axis of the OF cable;
However, the repair tool according to claim 5, wherein the reinforcing plate is located between the fastening belt and the annular rib at a position where the fastening belt and the reinforcing plate intersect.   The repair tool according to claim 6, wherein the reinforcing plate is made of iron or steel.   The length of an edge arranged so as to extend in the circumferential direction of the OF cable in the substantially rectangular base portion is 1/3 to 1 times the circumferential length of the OF cable. The repair tool according to any one of 5 to 7.   The said clamping belt is connected with the said oil-blocking sheet in the position which overlaps with the at least 1 part of the said annular rib on the inside or outer surface of the base of the said oil-blocking sheet, The said oil-blocking sheet is characterized by the above-mentioned. The repair tool according to any one of the above.   The repair tool according to claim 1, wherein the fastening belt is made of stainless steel.   The repair tool according to claim 1, wherein a ratchet mechanism is provided at an end of the fastening belt. A method for repairing an oil leakage point of an OF cable with the repair tool according to claim 1,
First, the oil blocking sheet is arranged so that the inner surface of the base portion faces the OF cable side, and the oil leakage portion is surrounded by any annular rib,
Next, at least one fastening belt is circulated around the OF cable, and the oil blocking sheet is fixed to the surface of the OF cable by the fastening belt.

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