JP2016063654A - Gas leakage repair tool and gas leakage repair method for communication cable closure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to stop gas leakage from a closure including gas leakage from a seal portion between the outer circumference of cable and an end face plate without dismantling the closure, and to keep the stop effect for a long time.SOLUTION: A gas leakage repair tool 10 for a closure 1 that is mounted on between ends of both communication cables, surrounds a connection part or branching part, and secures gas circulation between both communication cables comprises: an elastic sealing member 20 that has a C-shaped cut and is mounted so as to cover from outside a seal part between the outer periphery surface of the cable end and an end face plate 3 and to surround the outer periphery surface of the cable end; and a pressing tool 30 for pressing the elastic sealing member 20 to the seal part side while limiting diameter expansion distortion of the elastic sealing member 20. By making the elastic sealing member 20 cause pressing distortion by the pressing tool 30, the elastic sealing member 20 covering the seal part is made to closely contact with the outer periphery surface of the cable end.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a gas leakage repair tool for a communication cable closure and a gas leakage repair method using the same.

  Communication cables continuously contain dry air or other gas inside the cable as a measure to prevent water from entering the cable, and even if the cable is damaged, the gas can be blown out to prevent water from entering. Yes. Further, by detecting a change in the pressure of the gas flowing in the cable, the leaked portion of the gas is remotely monitored, thereby maintaining and managing the communication cable remotely.

  Such a communication cable is a frame that hermetically encloses both the connected and branched cable ends so that a continuous gas flow can be maintained even at the connection and branching portions where the cable ends are opened. The body is provided. There is what is called a closure in this frame, and the circulation of gas is secured between both cables connected or branched by opening the cable end in the closure.

  The closure forms a cylindrical frame by sandwiching a cable end portion with a half-shaped end face plate in an air-tight manner and attaching a half-shaped sleeve on the outer periphery of a pair of facing end face plates. In some cases, the internal airtightness of the closure cannot be maintained due to the addition of vibration or aging, and repair work is required. At that time, if it is attempted to dismantle the closure and replace the sealing material, it is difficult to maintain the internal pressure inside the cable at a predetermined value, and it is also difficult to connect to communication lines or branch points. Since work that does not have an adverse effect is required, the work must be labor intensive.

  Therefore, a repair method for sealing a gas leakage portion without disassembling the closure has been proposed. For example, in Patent Document 1 below, a repair method is proposed that seals the gas leaking from the seal portion between the outer peripheral surface of the cable and the end surface plate by covering the outside of the end surface plate of the closure with the resin along with the outer periphery of the cable. ing.

JP-A-5-146026

  According to the above-described prior art, it is possible to restore the airtightness between the outer peripheral surface of the cable and the end face plate that sandwiches the cable by a relatively simple operation without disassembling the closure. However, since the outer sheath of the cable is generally made of polyethylene, it is difficult to select a resin material that can maintain high adhesion with it for a long time, and even if the gas leakage can be temporarily suppressed by repair, There was a problem that gas leakage occurred again with the passage of time, and there was a problem that it took time and cost for repeated repair work.

  This invention makes it an example of a subject to cope with such a problem. That is, the gas leakage of the closure including the gas leakage from the seal portion between the outer periphery of the cable and the end face plate can be suppressed without disassembling the closure, and the suppression effect can be maintained for a long time, etc. Is the object of the present invention.

  In order to achieve such an object, a gas leakage repair tool and a gas leakage repair method for a communication cable closure according to the present invention have the following configurations.

  A gas leakage repair tool for a closure that is mounted between both communication cable ends to be connected or branched, surrounds the connection or branch and secures gas flow between the two communication cables. A C-shaped elastic sealing member that covers a sealing portion between the outer peripheral surface and the end face plate of the closure from the outside and is mounted so as to surround the outer peripheral surface of the cable end portion, and an enlarged diameter of the elastic sealing member And a pressing tool that restricts deformation and presses the elastic sealing member toward the seal portion, and the elastic sealing member covers the sealing portion by pressing and deforming the elastic sealing member with the pressing tool. A gas leakage repair tool for a communication cable closure, wherein the cable end is closely attached to the outer peripheral surface of the cable end.

  A gas leakage repair method for a closure that is mounted between both ends of a communication cable to be connected or branched, surrounds the connection or branch, and secures gas flow between the two communication cables. A sealing part between the outer peripheral surface and the end face plate of the closure is covered from the outside, and a C-shaped elastic sealing member surrounding the outer peripheral surface of the cable end part is attached, and the elastic sealing member is subjected to expansion deformation. By restricting and pressing the elastic sealing member toward the seal portion and pressing and deforming the elastic sealing member, the elastic sealing member covering the seal portion is brought into close contact with the outer peripheral surface of the cable end portion. A gas leakage repair method for communication cable closures.

  According to the gas leakage repair tool and the gas leakage repair method of the present invention for the communication cable closure having the above features, the gas leakage from the seal portion between the outer periphery of the cable and the end face plate is suppressed without dismantling the closure. The deterrent effect can be maintained for a long time.

It is explanatory drawing (partial cross-sectional perspective view) which shows the structure of a general closure (standard closure). It is explanatory drawing (front view of an end surface board) which shows the structure of a general closure (standard closure). It is explanatory drawing (front view of an end surface board) which shows the structure of a general closure (standard closure). It is explanatory drawing (partial sectional view which shows a mounting state) explaining the gas leak repair tool concerning embodiment of this invention. It is explanatory drawing (the perspective view (a) and front view (b) of an elastic sealing member) explaining the gas leak repair tool which concerns on embodiment of this invention. It is explanatory drawing (a color perspective view (a) and a front view (b)) explaining the gas leak repair tool concerning embodiment of this invention. It is explanatory drawing (a front view (a) of a push frame, and a front view (b) of a fixing ring) explaining the gas leak repair tool concerning embodiment of this invention. It is explanatory drawing (a front view (a) of a push frame, and a front view (b) of a fixing ring) explaining the gas leak repair tool concerning embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings (in the following description, common parts in the drawings are given the same reference numerals and redundant description will be omitted). The structure of a general closure (standard closure) will be described with reference to FIGS. The closure 1 shown in FIG. 1 is mounted between the end portions of both communication cables L1, L2 to be connected, and has a cylindrical shape surrounding the connection portion 2 that connects the communication lines of the communication cables L1, L2. It is a frame, and includes an end face plate 3 composed of half plates 3a, 3b sandwiching the cable ends of the communication cables L1, L2, and a sleeve 4 composed of half sleeves 4a, 4b attached to the outer periphery of the end face plate 3. ing.

  The end plate 3 is a cable end insertion port through which the half plates 3a and 3b are joined by screws 3c1 at the flange portion 3c with the gasket 3c2 interposed therebetween, and the end portions of the communication cables L1 and L2 are inserted into the center portion thereof. 3d is formed. The cable end portions of the communication cables L1 and L2 are formed with a seal portion in which the air tight tape 5 is wound around the outer peripheral surface in the cable end insertion port 3d, and the outer peripheral surface of the air tight tape 5 is the cable end insertion port. By tightly adhering to the inner surface of 3d, the airtightness between the outer peripheral surface of the cable end and the end face plate 3 is maintained.

  A gasket 6 is provided between the outer peripheral edge of the end face plate 3 and the half sleeves 4a, 4b, and a sleeve gasket 7 is provided at the joint between the half sleeves 4a, 4b. And the sleeve 4 or the half sleeves 4a and 4b are kept airtight. The sleeve 4 is firmly tightened by the tightening belt 8 in a state where the half sleeves 4a and 4b are coupled.

  Such a closure 1 has an airtight space formed therein, thereby ensuring gas flow between both communication cables L1 and L2 to be connected. That is, the gas in the upstream communication cable L1 flows into the closure 1 from the cable end opened in the closure 1, and flows into the cable end of the downstream communication cable L2 opened in the closure 1. It has become.

  As shown in FIG. 1, the closure 1 is not only mounted between the ends of the one-to-one communication cables L1 and L2 to be connected, but also includes a one-to-many communication cable including a branching portion. Are attached so as to surround the connecting portion or the branching portion. In this case, the end face plate 3 becomes different depending on the number of one or the other communication cable. FIG. 2 shows the end face plate 3 in the case where one communication cable is one. As described above, the half plates 3a and 3b are joined, and the cable end insertion port 3d is formed at the center thereof. . FIG. 3 shows an example of the shape of the end face plate 3 in the case where there are a large number of one or the other communication cable. In the example shown in FIG. 3A, the half plates 3a1 and 3b1 are joined to each other. Cable end insertion ports 3d1 and 3d2 through which the communication cables L1a and L1b are inserted are formed. In the example shown in FIG. 3B, the divided plates 3s1, 3s2, and 3s3 are joined to form cable end insertion ports 3d3, 3d4, and 3d5 through which the three communication cables L1c, L1d, and L1e are inserted, respectively. ing. Also in each example, a seal portion in which the air tight tape 5 is wound around the outer peripheral surface of the cable end portion is formed in the cable end portion insertion openings 3d1 to 3d5.

  Such a closure 1 may not be able to maintain internal airtightness due to the addition of vibration or aging as described above. The main cause is the seal in the cable end insertion ports 3d, 3d1 to 3d5. It has been confirmed that this is gas leakage at the portion, that is, gas leakage at the seal portion between the outer peripheral surface of the cable end and the end face plate 3. This gas leakage at the seal portion is caused by deterioration of the air tight tape 5 or the like. The embodiment of the present invention proposes a repair tool for repairing gas leakage at the seal portion and a repair method using the repair tool.

  4-8 is explanatory drawing explaining the gas leak repair tool which concerns on embodiment of this invention. FIG. 4 shows a state in which the gas leakage repair tool 10 is mounted. The gas leakage repair tool 10 includes an elastic sealing member 20 and a pressing tool 30. The elastic sealing member 20 is formed of a rubber material that is elastically deformed in the horizontal direction when pressed in the vertical direction. In this embodiment, the elastic sealing member 20 is mounted in the cable end insertion port 3d. A seal part is formed in the cable end insertion port 3d by an air tight tape 5 wound around the cable end. The seal part covers the seal part and surrounds the outer peripheral surface of the cable end. Has been. The elastic sealing member 20 is attached to the inside of the cable end insertion port 3 d, so that the diameter expansion deformation is restricted on the inner surface of the cable end insertion port 3 d and is in close contact with the air tight tape 5.

  The pressing tool 30 presses the elastic sealing member 20 toward the seal portion in a state in which the diameter expansion deformation of the elastic sealing member 20 is restricted, and a collar (pressing tool) 31 that directly presses the elastic sealing member 20. , A pressing frame (pressing tool) 32 that presses the collar 31, a fixing ring 33 that is fixed to the outer peripheral surface of the closure 1 (the outer peripheral surface of the sleeve 4), and a pulling screw (attracting tool) that pulls the pressing frame 32 toward the fixing ring 33. 34).

  Specific examples of each tool will be described with reference to FIGS. FIG. 5 shows a specific example of the elastic sealing member 20 ((a) is a perspective view and (b) is a plan view). In the illustrated example, the elastic sealing member 20 is a columnar rubber member having a hollow portion 20a surrounding the cable end, and is C-shaped so that it can be disposed around the cable end.

  FIG. 6 shows a collar (pressing tool) 31 that is one of the pressing tools 30 ((a) is a perspective view and (b) is a plan view). The collar 31 is a metal member composed of halves 31A and 31B, and has recesses 31A1 and 31B1 surrounding the cable end on the inner surface side, and a step portion 31A2 with which the push frame 32 abuts on the outer peripheral surface side. , 31B2 are formed.

  FIG. 7 shows a specific example of a pressing frame (pressing tool) 32 and a fixing ring 33, which is one of the pressing tools 30, (a) shows an example of the pressing frame 32, and (b) corresponds to it. An example of the fixing ring 33 is shown. The push frame 32 is formed by connecting the divided bodies 32A and 32B with a connecting screw 32t. The pressing frame 32 includes contact portions 32p that contact the step portions 31A2 and 31B2 of the collar 31 at the center thereof, and pulling screws 34 at both ends thereof. The screw insertion part 32s which penetrates is provided. The fixing ring 33 is formed by connecting the half rings 33A and 33B with a connecting screw 33t, and includes a screw insertion portion 33s through which the drawing screw 34 is inserted.

  FIG. 8 shows another specific example of a pressing frame (pressing tool) 32 and a fixing ring 33, which is one of the pressing tools 30, (a) shows another example of the pressing frame 32, and (b) The example of the fixing ring 33 corresponding to it is shown. The example shown here is an example in the case where the end face plate 3 includes three cable end insertion ports (see FIG. 3B), and the push frame 32 forms screw insertion portions 32s at both ends. The divided bodies 32C and 32D are coupled by a coupling screw 32t. A thread insertion portion 32s is formed at one end, and the divided bodies 32E and 32F that engage the divided bodies 32C and 32D at the other end are coupled by a coupling screw 32t. Are combined. The push frame 32 presses the plurality of collars 31 respectively disposed at the plurality of cable end insertion openings, presses the two collars 31 with the divided bodies 32C and 32D, and the other with the divided bodies 32E and 32F. Press one of the collars. The fixing ring 33 shown in FIG. 8B is obtained by connecting half rings 33C and 33D with a connecting screw 33t, and includes three screw insertion portions 33s through which the pulling screw 34 is inserted.

  Such a gas leakage repair tool 10 is pressed by tightening a plurality of pulling screws 34 (bolts and nuts) inserted between the screw insertion portion 32 s of the push frame 32 and the screw insertion portion 33 s of the fixing ring 33. The frame 32 is moved toward the fixing ring 33 fixed to the closure 1, the push frame 32 pushes the collar 31, and the collar 31 pushes the elastic sealing member 20. The elastic sealing member 20 is pressed and deformed. At this time, the elastic sealing member 20 is effectively deformed toward the outer peripheral surface of the cable end portion because the diameter expansion deformation is restricted on the inner surface of the cable end insertion port 3d. The inner side of the elastic sealing member 20 covering the seal portion in the opening 3d is in close contact with the outer peripheral surface of the cable end portion, and the elastic sealing member 20 itself is in close contact with the air tight tape 5 of the seal portion. The outside of the sealing member 20 is in close contact with the inner surface of the cable end insertion opening 3d. As a result, instead of the deteriorated air tight tape 5, the gap between the outer peripheral surface of the cable end and the end face plate 3 is sealed by the elastic sealing member 20, and the outer peripheral surface of the cable end and the end face plate 3 are sealed. Gas leakage from the gap can be effectively suppressed.

  According to such a gas leak repairing method using the gas leak repair tool 10, a C-shape that covers the seal portion between the outer peripheral surface of the cable end portion and the end face plate 3 from the outside and surrounds the outer peripheral surface of the cable end portion. The elastic sealing member 20 is mounted, the diameter expansion deformation of the elastic sealing member 20 is restricted, the elastic sealing member 20 is pressed toward the seal portion side, and the elastic sealing member 20 is pressed and deformed, whereby the seal portion An elastic sealing member 20 covering the cable is closely attached to the outer peripheral surface of the cable end. As a result, gas leakage from the seal portion between the outer periphery of the cable and the end face plate 3 can be suppressed without disassembling the closure 1, and the outer peripheral surface of the cable is made of polyethylene or the like and is difficult to adhere to a resin or the like. Even so, the gas leakage of the seal portion can be effectively suppressed by the close contact of the elastic sealing member 20. And the deterrent effect can be maintained for a long time.

1: Closure, 2: Connection part, 3: End face plate,
3a, 3b, 3a1, 3b1: half board,
3s1, 3s2, 3s3: division plates,
3c1: screw, 3c2: gasket,
3d, 3d1 to 3d5: cable end insertion port,
4: Sleeve, 4a, 4b: Half sleeve,
5: Air tight tape, 6: Gasket, 7: Sleeve gasket,
8: Fastening belt,
10: Gas leak repair tool,
20: elastic sealing member,
30: pressing tool, 31: collar (pressing tool), 31A, 31B: halved body,
31A1, 31B1: recessed portion, 31A2, 31B2: stepped portion,
32: Push frame (pressing tool),
32A, 32B, 32C, 32D, 32E, 32F: divided bodies,
32t: coupling screw, 32p: contact part, 32s: screw insertion part,
33: fixing ring, 33t: coupling screw, 33s: screw insertion part,
34: drawing screw (drawing tool),
L1, L2, L1a, L1b, L1c, L1d, L1e: Communication cable

Claims (4)

A gas leakage repair tool for a closure that is mounted between both communication cable ends to be connected or branched, surrounds the connection or branch, and ensures gas flow between both communication cables,
A C-shaped elastic sealing member that covers a seal portion between the outer peripheral surface of the cable end portion and the end face plate of the closure from the outside and is mounted so as to surround the outer peripheral surface of the cable end portion;
A pressing tool that restricts expansion deformation of the elastic sealing member and presses the elastic sealing member toward the seal portion;
A gas leakage repair of a communication cable closure, wherein the elastic sealing member covering the seal portion is brought into close contact with an outer peripheral surface of the cable end portion by pressing and deforming the elastic sealing member with the pressing tool. Ingredients.   The elastic sealing member is mounted inside a cable end insertion port provided in the end face plate, and restricts the diameter expansion deformation of the elastic sealing member on the inner surface of the cable end insertion port. A gas leakage repair tool for a communication cable closure according to claim 1.   The said pressing tool is provided with the fixing ring fixed to the outer peripheral surface of the said closure, the pressing tool which presses the said elastic sealing member, and the drawing tool which pulls the said pressing tool to the said fixing ring side, It is characterized by the above-mentioned. Item 3. A gas leakage repair tool for a communication cable closure according to item 1 or 2. A gas leakage repair method for a closure that is mounted between the ends of both communication cables to be connected or branched, surrounds the connecting portion or the branch and secures gas flow between the two communication cables,
A C-shaped elastic sealing member that covers the outer peripheral surface of the cable end portion and covers the seal portion between the outer peripheral surface of the cable end portion and the end face plate of the closure from the outside is attached,
The elastic sealing member that covers the sealing portion is formed by restricting the diameter expansion deformation of the elastic sealing member and pressing the elastic sealing member toward the seal portion to cause the elastic sealing member to be pressed and deformed. A gas leakage repair method for a communication cable closure, characterized in that the gas cable is brought into close contact with the outer peripheral surface of the cable end.

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