JP2016063656A - 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 for a closure 1 comprises: a cable outer periphery sealing member 20 that is closely wound around the outer periphery surface of cable L at the outside of the closure 1; a whole area sealing member 21 that closely contacts with the outer periphery of the cable outer periphery sealing member 20 and covers the whole of the end surface of the closure 1; and a pressing tool 30 that surrounds the outer periphery of the whole area sealing member 21 and presses the whole area sealing member 21 to the end face side of the closure 1.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, it is an object of the present invention that gas leakage of the closure can be suppressed without disassembling the closure, and the suppression effect can be maintained for a long time.

  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 the ends of both communication cables to be connected or branched, surrounds the connection or branch, and secures gas flow between the two communication cables. A cable outer periphery sealing member wound in close contact with the outer peripheral surface of the cable, a whole surface sealing member that is in close contact with the outer periphery of the cable outer periphery sealing member and covers the entire end surface of the closure, and the entire surface sealing member A gas leakage repair tool for a communication cable closure, comprising: a pressing tool that surrounds the outer periphery of the sealing cable and presses the entire sealing member toward the end face of the closure.

  A gas leakage repair method for a closure that is mounted between the end portions of both communication cables to be connected or branched, surrounds the connecting portion or the branch portion, and secures gas flow between the two communication cables, and is outside the closure. The cable outer periphery sealing member is closely attached to the outer peripheral surface of the cable and wound, and the entire surface sealing member that is in close contact with the outer periphery of the cable outer periphery sealing member and covers the entire end surface of the closure is attached to the end surface of the closure. And a step of mounting a pressing tool that surrounds the outer periphery of the entire sealing member and presses the entire sealing member against the end face of the closure, and pressing the entire sealing member with the pressing tool. A gas leakage repair method for a communication cable closure, characterized by comprising:

  According to the gas leak repair tool and gas leak repair method of the present invention for communication cable closures having such characteristics, the gas leak of the closure can be suppressed without disassembling the closure, and the suppression effect is maintained for a long time. Can be made.

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 1st Embodiment of this invention. It is explanatory drawing (front view which shows a whole surface sealing member and a pushing tool) explaining the gas leak repair tool concerning 1st Embodiment of this invention. It is explanatory drawing (partial sectional view which shows a mounting state) explaining the gas leak repair tool which concerns on 2nd Embodiment of this invention. It is explanatory drawing (front view which shows a mounting state) explaining the gas leak repair tool which concerns on 2nd 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 leakage points are the seal portions in the cable end insertion ports 3d, 3d1 to 3d5. In addition, the seal portion between the end face plate 3 and the sleeve 4, the flange portion 3c of the end face plate 3, etc. Has also been confirmed to be a leak location. The embodiment of the present invention proposes a repair tool for repairing such gas leakage from a plurality of locations and a repair method using the repair tool.

  4 and 5 are explanatory views for explaining the gas leakage repair tool according to the first embodiment of the present invention. FIG. 4 shows a state where the gas leakage repair tool 10 is mounted. The gas leakage repair tool 10 includes a cable outer periphery sealing member 20, a whole surface sealing member 21, and a pressing tool 30.

  The cable outer periphery sealing member 20 is wound in close contact with the outer peripheral surface of the communication cable L outside the closure 1, and can be formed of an elastic plate member such as a rubber material, for example. The cable outer periphery sealing member 20 is attached to the cable outer peripheral surface outside the cable end insertion port 3d of the end surface plate 3. A seal portion is formed in the cable end insertion port 3d by an air tight tape 5 wound around the cable end portion, and a cable outer periphery sealing member 20 is mounted so as to cover the seal portion.

  The entire surface sealing member 21 is disposed so as to cover the entire end surface of the closure 1 so as to surround the outer periphery of the cable outer periphery sealing member 20. The entire surface sealing member 21 is a thick plate-like member formed of an elastic member such as a rubber material, and includes a hollow portion 21a through which the communication cable L is inserted. As shown in FIG. 5, the entire sealing member 21 is C-shaped so that it can be disposed around the cable end. Here, an example of a C-shaped shape is shown, but the present invention is not limited to this, and a divided shape that divides the hollow portion 21a may be used. Although the outer diameter of the communication cable L has various dimensions, by adjusting the winding condition of the cable outer periphery sealing member 20 wound around the communication cable L, the outer diameter of the cable outer periphery sealing member 20 is set to a constant value. Thus, the hole diameter of the hollow portion 21a of the entire sealing member 21 can be standardized.

  The pressing tool 30 is a jig that surrounds the outer periphery of the entire sealing member 21 and presses the entire sealing member 21 toward the end surface of the closure 1, and is fixed to the outer peripheral surface of the closure 1 (the outer peripheral surface of the sleeve 4). The fixing ring 33, a pressing tool (frame member 31, pressing frame 32) that presses the entire sealing member 21, and a pulling screw (drawing tool) 34 that pulls the pressing tool (frame member 31, pressing frame 32) toward the fixing ring 33. It has. As shown in FIG. 5, the frame member 31 is composed of half-shaped divided bodies 31 </ b> A and 31 </ b> B, and surrounds the entire outer periphery of the sealing member 21 and is coupled by a coupling screw 31 </ b> C.

  Such a gas leakage repair tool 10 is formed by tightening a plurality of pulling screws (drawing tools) 34 inserted between the screw insertion portions 32 s of the push frame 32 and the screw insertion portions 33 s of the fixing ring 33. 32 is moved to the fixing ring 33 side fixed to the closure 1, and the pushing frame 32 pushes the frame member 31 toward the end face plate 3, whereby the entire sealing member 21 is pressed against the front surface of the sleeve 4.

  At this time, since the inner surface of the hollow portion 21 a in the entire surface sealing member 21 is in close contact with the outer peripheral surface of the cable outer periphery sealing member 20, the front side of the sleeve 4 is sealed by the cable outer periphery sealing member 20 and the entire surface sealing member 21. Will be stopped. As a result, a seal portion by the air tight tape 5 in the cable end insertion port 3d of the end face plate 3, a seal portion between the outer peripheral surface of the end face plate 3 and the inner surface of the sleeve 4, and a seal portion of the flange portion 3c of the end face plate 3 are provided. Can be sealed by the cable outer periphery sealing member 20 and the entire surface sealing member 21, and gas leakage of the closure 1 can be effectively suppressed.

  6 and 7 are explanatory views for explaining a gas leakage repair tool according to the second embodiment of the present invention. FIG. 6 is a partial cross-sectional view showing a mounting state of the gas leakage repair tool 10A, and FIG. 7 is a front view thereof. The gas leakage repair tool 10 </ b> A includes the cable outer periphery sealing member 20, the entire surface sealing member 21, and the pressing tool 30 as in the above-described embodiment.

  As in the above-described embodiment, the pressing tool 30 includes a fixing ring 33 that is fixed to the outer peripheral surface (sleeve 4) of the closure 1, a frame member (pressing tool) 31 that presses the entire sealing member 21, and a fixing ring 33. A drawing screw (drawing tool) 34 for drawing the frame member 31 is provided on the side. The frame member 31 is a half-shaped member surrounding the entire sealing member 21. And as a pushing tool, the press board member 35 fixed to the frame member 31 and pressing the center part of the whole surface sealing member 21 is provided. Further, a pressing member 36 that is pressed toward the closure 1 by the frame member 31 and the pressing plate member 35 (pressing tool) and presses the cable outer periphery sealing member 20, and an anti-winding member that winds the pressing member 36 around the cable L 37.

  In this embodiment, a screw insertion portion 31 s is provided in the frame member 31, and a plurality of drawing screws (drawing tools) 34 inserted between the screw insertion portion 31 s and the screw insertion portion 33 s of the fixing ring 33 are tightened. As a result, the frame member 31 is moved to the fixing ring 33 side fixed to the closure 1, and the entire sealing member 21 is pressed against the front surface of the sleeve 4.

  At this time, since the pressing plate member 35 is fixed to the frame member 31, not only the periphery of the entire sealing member 21 is pressed against the front surface of the sleeve 4, but also the central portion of the entire sealing member 21 is the end plate 3. Pressed against the outside. The frame member 31 and the pressing plate member 35 press the pressing member 36 against the cable outer periphery sealing member 20, so that the cable outer periphery sealing member 20 is prevented from coming off, and the outer periphery of the cable outer periphery sealing member 20 is The adhesiveness with the inner surface of the hollow part 21a in the whole surface sealing member 21 can further be improved. As a result, a seal portion by the air tight tape 5 in the cable end insertion port 3d of the end face plate 3, a seal portion between the outer peripheral surface of the end face plate 3 and the inner surface of the sleeve 4, and a seal portion of the flange portion 3c of the end face plate 3 are provided. Can be sealed by the cable outer periphery sealing member 20 and the entire surface sealing member 21, and gas leakage of the closure 1 can be effectively suppressed.

  According to such a gas leak repairing method using the gas leak repair tool 10, 10A, the step of tightly winding the cable outer periphery sealing member 20 around the outer peripheral surface of the communication cable L outside the closure 1, and the cable outer periphery sealing A step of disposing a full-surface sealing member 21 that is in close contact with the outer periphery of the member 20 and covers the entire end surface of the closure 1 on the end surface of the closure 1; A step of attaching a pressing tool 30 to be pressed to the end face side of the closure 1 and pressing the entire sealing member 21 by the pressing tool 30. Thereby, the gas leakage from the seal part between the outer periphery of the communication cable L and the end face plate 3 or the seal part between the end face plate 3 and the sleeve 4 can be suppressed without disassembling the closure 1. Even if the outer peripheral surface of the communication cable L is made of polyethylene or the like and hardly adheres to a resin or the like, the gas outer periphery sealing member 20 and the entire surface sealing member 21 can be effectively prevented from leaking gas at the sealing portion. Can do. 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,
3c: flange part, 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, 10A: Gas leak repair tool,
20: Cable outer periphery sealing member, 21: Whole surface sealing member, 21a: Hollow part,
30: Pressing tool, 31: Frame member (pressing tool), 31A, 31B: Half body,
31C: coupling screw, 31s: screw insertion part,
32: Push frame (pressing tool), 32s: Screw insertion part,
33: fixing ring, 33s: screw insertion part,
34: drawing screw (drawing tool),
35: Push plate member (pressing tool), 36: Press member, 37: Winding member,
L, L1, L2, L1a to L1e: Communication cable (cable)

Claims (6)

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 cable outer periphery sealing member wound in close contact with the outer peripheral surface of the cable outside the closure;
A full-surface sealing member that closely adheres to the outer periphery of the cable outer peripheral sealing member and covers the entire end surface of the closure;
A gas leakage repair tool for a communication cable closure, comprising: a pressing tool that surrounds the outer periphery of the entire sealing member and presses the entire sealing member toward the end face of the closure.   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 whole surface 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 10. A gas leakage repair tool for a communication cable closure according to item 1.   The gas leakage repair tool for a communication cable closure according to claim 2, wherein the pusher includes a half-shaped frame member surrounding the entire sealing member.   The gas leakage repair tool for a communication cable closure according to claim 3, wherein the pressing tool includes a pressing plate member that is fixed to the frame member and presses a central portion of the entire sealing member.   3. A pressing member that is pressed to the closure side by the pressing tool to press the cable outer periphery sealing member, and a winding member that winds the pressing member around the cable. 4. A gas leakage repair tool for a communication cable closure as described in any one of 4 above. 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 step of tightly winding the cable outer periphery sealing member on the outer peripheral surface of the cable outside the closure;
A step of disposing a full surface sealing member on the end surface of the closure, which is in close contact with the outer periphery of the cable outer periphery sealing member and covers the entire end surface of the closure;
Mounting a pressing tool that surrounds the outer periphery of the entire sealing member and presses the entire sealing member toward the end face of the closure, and pressing the entire sealing member with the pressing tool. Gas leak repair method for communication cable closures.

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