JP5358640B2 - OF cable repair device and repair method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily repair an oil leakage location of an OF (oil-filled) cable. <P>SOLUTION: Oil leakage is suppressed by sticking an adhesive tape 2 to an oil leakage location C1; an expansion tube 3 is wound around an outer peripheral surface of an OF cable C including the adhesive tape 2 ; and a pressing cover 4 is attached so as to cover the expansion tube 3. In this state, the expansion tube 3 is expanded by injecting air into the expansion tube 3. Thereby, the expansion tube 3 is pressed by the pressing cover 4, and brought into close contact with the outer peripheral surface of the OF cable C. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to an OF cable repair device and a repair method for repairing an oil leakage point of an OF cable.

  The OF cable is a cable with improved insulation by injecting and filling insulating oil into the interior at a predetermined pressure, and the metal coating that holds the hydraulic pressure is damaged by aging, or a third party. Oil leakage may occur due to accidental damage during construction. In such a case, it is necessary to cut the OF cable by a predetermined length including the oil leakage point and replace it. However, since it takes a lot of time and labor, the leakage is required prior to the replacement (main repair). In order to suppress the amount of oil as much as possible, it is necessary to repair the oil leakage part (temporary oil stop treatment) as an initial response.

  As such repair, a temporary fixing layer is provided by winding rubber / plastic tape with high tension on the outer periphery of the cracked portion of the lead cover of the OF cable, and a wound layer of glass fiber tape and an epoxy resin layer thereon. Is known to provide an oil stop layer (see, for example, Patent Document 1). In addition, the anti-corrosion layer around the oil leak location is peeled off, a pedestal is provided around the oil leak location, a copper pipe is mounted across the base, and the copper tube and the pedestal are joined by lead craft. (For example, refer to Patent Document 2).

Japanese Utility Model Publication No. 02-037530 JP 2000-341820 A

  However, in the technique of Patent Document 1, in order to stop the oil leakage, the rubber / plastic tape and the glass fiber tape must be wound with proper tension, and the two tapes must be wound one after the other. Don't be. For this reason, the work requires skill, requires at least two workers, and takes a long time.

  Similarly, in the technique of Patent Document 2, work such as joining a copper tube and a pedestal by lead works must be performed, so the work requires special skills, and full-time workers are on-site. It is necessary to dispatch, and it takes a long time to complete the repair. Moreover, the OF cable is normally buried in the basement in a state of being disposed in the pipeline, and the work space and environment are limited. Therefore, an easier repair method is required.

  Accordingly, an object of the present invention is to provide an OF cable repairing apparatus and a repairing method that make it possible to easily repair an oil leakage portion of an OF cable.

  In order to solve the above-mentioned problem, the invention of claim 1 is an OF cable repair device for repairing an oil leak location formed on an outer peripheral surface of an OF cable into which oil has been injected. An adhesive tape that is attached to a portion to suppress oil leakage, an expansion tube that is wound around an outer peripheral surface of an OF cable including the adhesive tape, and expands when gas is injected therein, and an outer peripheral surface of the OF cable A press cover that covers the wound expansion tube in a detachable manner, presses the expansion tube expanded by injecting gas, and tightly contacts the expansion tube with the outer peripheral surface of the OF cable. To do.

  According to this invention, the adhesive tape is affixed to an oil leakage location to suppress oil leakage, the expansion tube is wound around the outer peripheral surface of the OF cable including the adhesive tape, and the pressure cover is attached so as to cover the expansion tube. In this state, by injecting gas into the expansion tube and expanding the expansion tube, the pressure cover presses the expansion tube, the expansion tube adheres to the outer peripheral surface of the OF cable, and leakage of oil to the outside is prevented.・ Deterred.

  According to a second aspect of the present invention, in the OF cable repairing apparatus according to the first aspect, an exposed portion that exposes the gas injection portion provided in the expansion tube to the outside is provided in the pressing cover. And

  According to a third aspect of the present invention, in the OF cable repairing device according to the first or second aspect, the pressing cover is cylindrical, and the expanded tube that has expanded is prevented from projecting from the pressing cover at both ends thereof. The protrusion prevention part is provided, It is characterized by the above-mentioned.

  The invention of claim 4 is an OF cable repairing method for repairing an oil leakage spot formed on the outer peripheral surface of the OF cable into which oil has been injected, and an adhesive tape is attached to the oil leakage spot to leak the oil. The expansion tube is wound around the outer peripheral surface of the OF cable including the adhesive tape, and a pressure cover is attached so as to cover the expansion tube. In this state, gas is injected into the expansion tube to expand the expansion tube. By doing so, the expansion tube is pressed by the pressing cover, and the expansion tube is brought into close contact with the outer peripheral surface of the OF cable.

  According to this invention, since the expansion tube is in close contact with the outer peripheral surface of the OF cable, leakage of oil to the outside is prevented / suppressed.

  According to a fifth aspect of the present invention, in the OF cable repairing method according to the fourth aspect, after injecting gas into the expansion tube, contact portions between the expansion tube and the outer peripheral surface of the OF cable at both ends of the press cover. In addition, a filler is applied.

  According to the first and fourth aspects of the present invention, the oil leaks to the outside by attaching the adhesive tape to the oil leakage portion, winding the expansion tube, attaching the pressure cover, and injecting the gas into the expansion tube. Can be prevented / deterred. Moreover, any one of the operations that can be performed by the adhesive tape, the winding of the expansion tube, the injection of the gas into the expansion tube, etc. does not require special skills and experience. For this reason, it becomes possible to repair the oil leak location of the OF cable easily. Furthermore, the apparatus can be easily detached from the OF cable by simply removing the gas from the expansion tube, removing the pressure cover, and removing the expansion tube, and the apparatus can be reused over and over again.

  According to invention of Claim 2, since the gas injection part of an expansion tube is exposed outside via the exposure part provided in the press cover, even after covering an expansion tube with a press cover, a gas injection part Thus, gas can be easily injected into the expansion tube.

  According to invention of Claim 3, since the protrusion prevention part is provided in the both ends of the cylindrical press cover, even if an expansion tube expand | swells by gas injection, an expansion tube does not protrude from a press cover. As a result, the expansion tube is properly expanded in the pressure cover, and the expansion tube is properly adhered to the outer peripheral surface of the OF cable without any gap (at a predetermined pressure), thereby further preventing and suppressing leakage of oil to the outside. Can do.

  According to the fifth aspect of the present invention, since the filler is applied to the contact portion between the expansion tube and the outer peripheral surface of the OF cable at both ends of the press cover, oil leaks out from the contact portion (gap). It can be prevented / suppressed more.

It is process drawing which shows the OF cable repair method using the OF cable repair apparatus which concerns on embodiment of this invention, (a) shows the state before repair start, (b) stuck the adhesive tape The state is shown, (c) shows a state where the expansion tube is wound, (d) shows a state where the pressing cover is attached, and (e) shows a state where the expansion tube is expanded. It is a front view which shows the expansion tube of the repair apparatus of FIG. It is the front view (a) which shows the press cover of the repair apparatus of FIG. 1, and the left side surface (b). It is a top view which shows the state which opened the press cover of FIG. In embodiment of this invention, it is a front view which shows the state which formed the work window in the pipe line by which OF cable is arrange | positioned.

  The present invention will be described below based on the illustrated embodiments.

  FIG. 1 is a process diagram showing an OF cable repair method using an OF cable repair device 1 according to an embodiment of the present invention. This OF cable repair device 1 is a device for repairing an oil leakage location C1 formed on the outer peripheral surface of the OF cable C into which oil has been injected, and mainly includes an adhesive tape 2, an expansion tube 3, A pressing cover 4 is provided. Here, in this embodiment, the case where the present OF cable repair method is applied to the temporary repair that is performed as the initial countermeasure prior to the permanent repair, which is a permanent countermeasure, will be mainly described. Depending on the years of use of C, the installation environment, etc., this OF cable repair method may be applied as this repair.

  The adhesive tape 2 is a tape that is affixed to the oil leakage location C1 and suppresses the oil leakage, and can be bonded to the surface of the OF cable C in a state of being in close contact with the oil cable, so that the oil leakage can be temporarily suppressed. For example, a rubber tape, a plastic tape, etc. are mentioned. The size of the adhesive tape 2 is such that when the expansion tube 3 comes into close contact with the outer peripheral surface of the OF cable C as described later, the oil leakage from the oil leakage location C1 is temporarily suppressed. It is set so that oil leakage from the location C1 can be suppressed.

  The expansion tube 3 is a tube that is wound around the outer peripheral surface of the OF cable C including the adhesive tape 2 and expands when air (gas) is injected therein. That is, as shown in FIG. 2, it is a long tube closed at both ends, for example, a tube of a bicycle tire that is linearly extended, and has excellent gas permeation resistance, flex crack resistance, and the like. Etc. The cross-sectional shape (diameter) of the expansion tube 3 expands without a gap in the housing space S formed by the pressure cover 4 and the OF cable C when expanded as described later, and is pressed by the pressure cover 4. Thus, the OF cable C is set so as to be in close contact with the outer peripheral surface of the OF cable C with a predetermined pressure (pressure capable of suppressing / preventing oil outflow) without a gap.

  Furthermore, the length of the expansion tube 3, that is, the length wound around the OF cable C is sufficient pressure applied to the adhesive tape 2 (oil leakage location C 1), and the oil leaked from the adhesive tape 2. It is set so that the outflow of water can be suppressed and prevented. Moreover, the valve | bulb (gas injection | pouring part) 31 for inject | pouring air inside is provided in the one end part side.

  The pressing cover 4 detachably covers the expansion tube 3 wound around the outer peripheral surface of the OF cable C, presses the expansion tube 3 expanded by air being injected, and the expansion tube 3 is pressed to the outer periphery of the OF cable C. It is a cover that adheres to the surface. Specifically, as shown in FIGS. 3 and 4, it is substantially cylindrical and is divided into an upper cover 41 and a lower cover 42 at a cut surface passing through the axis, and the upper cover 41 and the lower cover 42 are connected via a hinge 43. And can be opened and closed like a double door. Further, two hooks 44 are provided along the longitudinal direction at the opening edge of the upper cover 41, and the hooks 44 are engaged with hooked portions (not shown) provided at the opening edge of the lower cover 42. The upper cover 41 and the lower cover 42 are closed by stopping, and the upper cover 41 and the lower cover 42 are opened by releasing the locking. In this way, the expansion tube 3 wound around the OF cable C is detachable.

  Further, side walls (protrusion prevention portions) 41 a and 42 a for preventing the expansion tube 3 expanded as described later from protruding from the pressing cover 4 are formed at both ends of the upper cover 41 and the lower cover 42. ing. The side walls 41a and 42a extend from the side edges of the upper and lower covers 41 and 42 to the axial center side, and an insertion hole 4a into which the OF cable C can be inserted when the upper and lower covers 41 and 42 are closed is formed. It is formed so that. That is, the expansion tube 3 protrudes from both sides of the pressing cover 4 when the upper and lower covers 41 and 42 are closed in a state where the open end edges (the peripheral edge of the insertion hole 4a) of the side walls 41a and 42a are in contact with the OF cable C. It is designed to prevent this.

  The outer diameter of the pressure cover 4 is set so that the pressure cover 4 can be inserted and disposed in a pipe T (see FIG. 5) described later. It is set so that it can be pressed and brought into close contact with the outer peripheral surface of the OF cable C with a predetermined pressure. The length of the press cover 4 is set so that the entire expansion tube 3 is accommodated and the expanded expansion tube 3 expands in the accommodation space S without a gap.

  Furthermore, the pressing cover 4 is made of a material having sufficient strength and rigidity to press the expanded tube 3 as described above and having an insulating property. The upper cover 41 is formed with an exposure hole (exposed portion) 41b that exposes the valve 31 of the expansion tube 3 to the outside. That is, when the pressing cover 4 is mounted in a state where the expansion tube 3 is wound around the OF cable C, an exposure hole 41b is formed at a position facing the valve 31, and as shown in FIG. The valve 31 protrudes outside the pressing cover 4 through 41b, and air can be injected from the valve 31.

  Next, an OF cable repairing method and the like by the OF cable repairing apparatus 1 having such a configuration will be described. Here, it is assumed that the OF cable C is disposed in the pipe line T.

  First, as shown in FIG. 5, the portion of the pipe line T facing the periphery of the oil leakage point C1 of the OF cable C is cut out to form a work window T1. Here, the size of the work window T1 is set such that the OF cable repairing device 1, that is, the pressing cover 4, can be inserted into the pipe line T and the placement work (repair work) can be performed.

  Next, as an adhesion step, as shown in FIG. 1B, the adhesive tape 2 is applied to the oil leakage location C1 of the OF cable C shown in FIG. Subsequently, as the winding step, the expansion tube 3 is wound around the outer peripheral surface of the OF cable C including the adhesive tape 2 as shown in FIG. At this time, air is not injected into the expansion tube 3, and the expansion tube 3 is wound without a gap so that the oil leakage location C <b> 1 is located at the center of the wound expansion tube 3.

  Subsequently, as a mounting step, as shown in FIG. 1 (d), the pressing cover 4 is mounted so as to cover the expansion tube 3. That is, the expansion tube 3 is positioned between the upper cover 41 and the lower cover 42, the valve 31 is inserted into the exposure hole 41b, the upper and lower covers 41, 42 are closed, and the hook 44 is hooked. Lock to the part. Thereby, the expansion tube 3 is accommodated in the accommodation space S of the press cover 4, and the open end edges (peripheries of the insertion holes 4a) of the side walls 41a and 42a are in contact with the OF cable C.

  In this state, as an injection step, as shown in FIG. 1 (e), air is injected from the valve 31 into the expansion tube 3 to expand the expansion tube 3, thereby pressing the expansion tube 3 with the press cover 4. The expansion tube 3 is brought into close contact with the outer peripheral surface of the OF cable C. In other words, when the expansion tube 3 expands, the expansion tube 3 is pressed by the inner peripheral wall of the pressing cover 4 while filling the accommodation space S without a gap, and the expansion tube 3 comes into close contact with the outer peripheral surface of the OF cable C. At this time, by setting the injection pressure / filling pressure to a predetermined pressure, the expansion tube 3 comes into close contact with the outer peripheral surface of the OF cable C with a predetermined pressure (a pressure at which oil outflow can be suppressed / prevented) without a gap.

  Next, the injection is stopped and a stopper is attached to the valve 31, and a filler is applied to the contact portion between the side walls 41 a and 42 a of the pressing cover 4 and the outer peripheral surface of the OF cable C. That is, an epoxy resin or the like is applied along the contact line between the peripheral edge of the insertion hole 4a and the OF cable C. Thus, in this embodiment, the filler is indirectly applied to the contact portion between the expansion tube 3 and the OF cable C by applying the filler to the contact portion between the side walls 41a, 42a and the OF cable C. It is supposed to be painted. On the other hand, when the side walls 41a and 42a are not provided, or when the insertion hole 4a is larger than the OF cable C, a filler is directly applied to the contact portion / gap between the expansion tube 3 and the OF cable C. Set up. That is, it is only necessary to prevent the oil from flowing out from both ends of the expansion tube 3 by coating the filler.

  Thereby, the attachment of the OF cable repairing apparatus 1 and the temporary repairing work are completed, and then the work piece T1 is joined to the work window T1 of the pipe T, and the work window T1 is refilled. On the other hand, when the OF cable repairing apparatus 1 is removed during this repair or the like, the work window T1 is opened, the filler is removed, the valve 31 is unplugged, and air is extracted from the expansion tube 3. Next, the pressing cover 4 is removed, and the expansion tube 3 is removed.

  As described above, according to the OF cable repairing apparatus 1 and the OF cable repairing method, the expansion tube 3 wound around the OF cable C is expanded, so that the expansion tube 3 is applied to the outer peripheral surface of the OF cable C at a predetermined pressure. It adheres without gaps and prevents or prevents leakage of oil to the outside. Moreover, since the side walls 41 a and 42 a are provided at both ends of the press cover 4, the expansion tube 3 does not protrude from the press cover 4. As a result, the expansion tube 3 properly expands in the pressure cover 4, and the expansion tube 3 is properly adhered to the outer peripheral surface of the OF cable C without any gap (with a predetermined pressure), thereby further preventing leakage of oil to the outside.・ Can be deterred. Furthermore, since the filler is applied to the contact portion between the side walls 41a, 42a of the press cover 4 and the OF cable C, it is possible to further prevent / suppress oil from leaking to the outside from the contact portion (gap). it can.

  In addition, since air pressure is constantly applied to the expansion tube 3, even if the OF cable C expands and contracts due to the outside air temperature or the like, the expansion tube 3 also contracts and expands accordingly, and the expansion tube 3 and the OF cable C are connected to each other. Adhesion is maintained. That is, leakage of oil to the outside can always be prevented / suppressed.

  On the other hand, the application of the adhesive tape 2, the winding of the expansion tube 3, the injection of air into the expansion tube 3, etc. are actions that can be easily performed by any one person and do not require special skills or experience. The oil leakage point of the cable C can be repaired appropriately, easily and quickly. In addition, such work does not require a large space and can be performed in the pipe T. For this reason, it is not necessary to cut the pipe line T and extract the OF cable C from the pipe line T to secure a large work space, and the work window T1 may be formed as described above. As a result, the restoration of the pipe line T after the repair work can be performed easily and quickly because it is only necessary to refill the work window T1.

  Further, since the valve 31 is exposed to the outside through the exposed portion 4 b of the press cover 4, air is easily injected into the expansion tube 3 from the valve 31 even after the expansion tube 3 is covered with the press cover 4. be able to. Further, the apparatus 1 can be easily detached from the OF cable C by simply removing the air from the expansion tube 3 and removing the pressure cover 4 and removing the expansion tube 3, and the apparatus 1 can be used over and over again. can do.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the pressing cover 4 can be opened and closed, but the upper cover 41 and the lower cover 42 may be separated and joined together. Moreover, the cross-sectional shape of the expansion tube 3 may be a horizontally long flat shape (band shape), and a large contact surface between the expansion tube 3 and the OF cable C when expanded may be secured.

  Moreover, although the press cover 4 is cylindrical and extends straight, the axis of the press cover may be curved in accordance with the shape and curvature of the OF cable C at the repair target location. Alternatively, a straight and short pressing cover may be connected by a plurality of joints, and the pressing covers may be rotated so that the pressing cover can be mounted according to the shape and curvature of the OF cable C.

1 OF cable repair device 2 Adhesive tape 3 Expansion tube 31 Valve (gas injection part)
4 Pressing cover 41 Upper cover 41a Side wall (protrusion prevention part)
41b Exposed hole (exposed part)
42 Lower cover 42a Side wall (protrusion prevention part)
44 Hook C OF cable C1 Oil leakage point T Pipe line T1 Work window

Claims (5)

An OF cable repairing device for repairing an oil leakage point formed on the outer peripheral surface of an OF cable in which oil is injected.
An adhesive tape that is affixed to the oil leakage location and suppresses oil leakage;
An expansion tube wound around the outer peripheral surface of the OF cable including the adhesive tape and inflated by injecting gas into the inside;
A pressing cover that detachably covers the expansion tube wound around the outer peripheral surface of the OF cable, presses the expansion tube expanded by injecting gas, and closely contacts the expansion tube with the outer peripheral surface of the OF cable; ,
An OF cable repairing device characterized by comprising: An exposed portion that exposes the gas injection portion provided in the expansion tube to the outside is provided in the pressing cover.
The OF cable repair device according to claim 1. The press cover is cylindrical, and at both ends thereof, a protrusion preventing portion for preventing the expanded expansion tube from protruding from the press cover is provided.
The OF cable repairing apparatus according to claim 1, wherein the OF cable repairing apparatus is a repairing apparatus. An OF cable repair method for repairing an oil leakage spot formed on the outer peripheral surface of an OF cable in which oil is injected.
Adhesive tape is attached to the oil leakage location to suppress oil leakage,
Wrap an expansion tube around the outer peripheral surface of the OF cable including the adhesive tape,
Attach a pressure cover to cover the expansion tube,
In this state, by injecting gas into the expansion tube to expand the expansion tube, the expansion tube is pressed with the pressing cover, and the expansion tube is brought into close contact with the outer peripheral surface of the OF cable.
OF cable repair method characterized by this. After injecting gas into the expansion tube, a filler is applied to the contact portion between the expansion tube and the outer peripheral surface of the OF cable at both ends of the pressing cover.
The OF cable repair method according to claim 4.

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