JP2018074637A - Repair instrument and gas leakage hole repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair instrument capable of easily repairing a gas leakage hole that is opened in a seal part of a closure, and a gas leakage hole repair method.SOLUTION: A repair instrument comprises: a base part 2 laminated cylindrically around a cable and including an abutment face 6 to be abutted to a principal surface of a seal part of a closure including the seal part whose principal surface is exposed outsides; and an insertion part 3 which is provided while extending on the abutment face 6, exposes a part of a viscous repair material that is pushed into a gas leakage hole opened in the seal part, outsides in a direction facing an inner wall of the gas leakage hole and includes an end face part 4 which is abutted to the repair material in a push-in direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a repair instrument for repairing a gas leak hole of a closure used in a communication cable and a gas leak hole repair method.

  A transmission device installed in a communication building and a terminal device such as a telephone are connected via, for example, an embedded communication cable. The communication cable is configured by connecting a plurality of cables. The cable includes an outer body and a plurality of core wires provided on the inner side of the outer body. Adjacent cables are integrally formed by connecting the core wires exposed from the outer body to each other. The core wire rusts when water adheres to it. For this reason, a closure for sealing between the cables is provided between adjacent cables. A space between the closure and the outer shell of the cable is sealed via a seal portion. Further, the space inside the outer casing of the cable and the inside of the sealed closure is set to a positive pressure by the gas supplied from the gas supply device in order to prevent water from entering.

  However, the closure is known to have a problem that gas is leaked through the seal portion due to deterioration over time. This problem is addressed by replacing the leaking gas closure.

  However, replacing the closure is cumbersome and time consuming. Therefore, a method has been proposed in which a gas leakage hole vacated in the seal portion of the closure is repaired with a screw without replacing the closure (see, for example, Patent Document 1).

JP-A-7-107652

  However, in this repair method, for example, when gas leakage is confirmed again after inserting the screw, there is a possibility that the gas leakage hole enlarged by the screw cannot be closed.

  Then, an object of this invention is to provide the repair tool and the gas leak hole repair method which can repair easily the gas leak hole vacant in the seal part.

  In order to solve the problems and achieve the object, the repair instrument and the gas leak hole repair method of the present invention are configured as follows.

As one aspect of the present invention, the repair device has a contact surface that contacts the main surface of the seal portion of the closure having a seal portion that is laminated in a cylindrical shape around the cable and has a main surface exposed to the outside. A base and a part of the adhesive repair material that extends from the contact surface and is pushed into the gas leak hole that is vacated in the seal portion, in an orientation facing the inner wall of the gas leak hole. And an insertion part having an end surface part that abuts against the repair material in the pushing direction,
Is provided.

  Moreover, as one aspect of the present invention, the gas leakage hole repairing method repairs a gas leakage hole vacant in the seal portion of the closure having a seal portion that is cylindrically stacked around the cable and has a main surface exposed to the outside. A gas leakage hole repair method, wherein a part of an adhesive repair material is attached to an end surface portion of the insertion portion in the repair tool so as to be exposed to the outside in a direction facing the inner wall of the gas leakage hole. Inserting the insertion portion into the gas leakage hole, pushing the repair material into the gas leakage hole at the end surface portion, and pulling out the insertion portion from the gas leakage hole. And clogging the gas leakage hole with a repair material.

  ADVANTAGE OF THE INVENTION According to this invention, the repair tool which can repair easily the gas leak hole vacant in the seal | sticker part, and the gas leak hole repair method using this repair tool can be provided.

FIG. 3 is an external view showing a configuration of a repair instrument according to the first embodiment of the present invention. Explanatory drawing which shows an example of a structure of the communication equipment repaired using the same repair tool. Schematic which shows the structure of the closure provided in the communication equipment. The perspective view which expanded a part of the closure. Schematic which shows a part of internal structure of the closure in a cross section. Explanatory drawing which shows the structure of the closure with a gas leak hole in cross section. Explanatory drawing which shows the structure of the closure with a gas leak hole in cross section. Explanatory drawing which shows the structure of the closure with a gas leak hole in cross section. The flowchart which shows the gas leak hole repair method using the instrument for the repair. The graph which shows the result of the performance test of a closure. The perspective view which expands and shows a part of 1st modification of the instrument for repair. The perspective view which expands and shows a part of 2nd modification of the instrument for a repair. The perspective view which expands and shows a part of 3rd modification of the instrument for a repair. Schematic which shows another form of a closure.

  FIG. 1 is an external view showing a configuration of a repair instrument 1 according to the first embodiment of the present invention. The repair tool 1 is a tool used for repairing a gas leak hole vacated in a closure provided in a communication facility. Therefore, first, an example of the configuration of communication equipment that is repaired using the repair tool 1 will be described.

  FIG. 2 is an explanatory diagram illustrating an example of the configuration of the communication facility 10 that is repaired using the repairing instrument 1.

  As shown in FIG. 2, the communication facility 10 includes a communication device 40, a communication cable 50, a closure 20, and a gas supply device 60.

  The communication device 40 is, for example, a transmission device or an exchange device installed in the communication building 100. For example, the communication device 40 is connected to a terminal device 70 such as a telephone installed in a house or the like via a communication cable 50.

  The communication cable 50 is integrally configured by connecting a plurality of cables 50a.

  The cable 50 a includes a core wire 51 and an outer body 52.

  A plurality of core wires 51 are provided inside the cable 50a. The core wire 51 is formed of, for example, a copper wire. The outer body 52 is provided outside the core wire 51. The outer body 52 is formed so as to protect the core wire 51 from water or the like by covering the core wire 51. Gas from the gas supply device 60 can flow between the outer body 52 and the core wire 51.

  The closure 20 is provided at a portion where adjacent cables 50a are connected to each other. The closure 20 seals between the cables 50a. The closure 20 protects the core wire 51 exposed from the outer body 52 from water or the like by keeping the inside airtight. The closure 20 is provided in a space inside the manhole 200 arranged underground.

3 is a schematic view showing the configuration of the closure 20, FIG. 4 is an enlarged perspective view showing the configuration of the end of the closure 20, and FIG. 5 shows a part of the internal structure of the closure 20. As shown in FIG. It is the schematic shown in a cross section.
As shown in FIG. 3, the closure 20 includes a main body portion 21, a seal portion 22, and a valve 23.

  The main body part 21 includes a body part 80, an end face plate 81, and a band 82. The main body 21 seals between the cables 50a connected to each other. The main body 21 has an internal space 83. In the internal space 83, a part of the cable 50a and the core wire 51 are arranged.

  The trunk | drum 80 is formed in a cylindrical shape, for example. The trunk | drum 80 is divided | segmented into an axial direction and is formed so that isolation | separation is radial. That is, the body 80 is formed by combining a pair of semi-cylindrical first body 80a and second body 80b.

The end face plates 81 are provided at both end portions of the body portion 80, respectively. The end face plate 81 is configured to block part of the openings at both ends of the body portion 80. A gasket is provided between the end face plate 81 and the body portion 80 so as to form an airtight space between the end face plate 81 and the body portion 80. The end face plate 81 is divided in the axial direction and formed so as to be separable in the radial direction. That is, the end face plate 81 is formed by combining a pair of semi-cylindrical first plate 81a and second plate 81b.
As shown in FIG. 4, the end face plate 81 has a hole 90 and a fixing portion 91. In the hole portion 90, the seal portion 22 and a part of the cable 50a are disposed.

  The fixing portion 91 is formed so that the sealing portion 22 and the cable 50 a arranged in the hole portion 90 can be fixed to the end face plate 81. The fixing portion 91 fixes a plate-like convex portion 92 protruding in the radial direction from the outer peripheral portion of the hole portion 90 with a bolt and a nut. The fixing portion 91 is configured to be capable of pressing in a direction in which the pair of the first plate 81a and the second plate 81b are combined in a cylindrical shape so as to be close to each other.

  The band 82 is formed so that the first body 80a and the second body 80b can be fastened and fixed in directions close to each other in a state where the first body 80a and the second body 80b are assembled in a cylindrical shape. .

  The seal portion 22 is formed so that the gap between the hole portion 90 and the cable 50a can be hermetically sealed. For example, as shown in FIGS. 4 and 5, the seal portion 22 is formed in a cylindrical shape by winding an air tight tape having a predetermined width and length around the cable 50a. In other words, the seal portion 22 is configured by laminating air tight tape in the radial direction of the cable 50a. The seal portion 22 has an outer surface (main surface) 24 on the side exposed to the outside of the closure 20 and an inner surface 25 on the inner space 83 side of the closure 20.

  The seal part 22 is formed by an elastic body, for example. Specifically, the seal part 22 is a rubber material. For example, the seal portion 22 is formed of EPDM (ethylene propylene diene rubber) that has excellent weather resistance.

  As shown in FIG. 3, the valve 23 is provided on the peripheral wall of the body portion 80. The valve 23 is formed so that the gas supplied to the closure 20 can be discharged and the gas can be supplied into the closure 20.

  As shown in FIG. 2, the gas supply device 60 is provided in a communication building 100, for example. The gas supply device 60 is connected to, for example, the cable 50a provided closest to the communication building 100 among the plurality of cables 50a to be embedded. The gas supply device 60 supplies gas to the inside of the outer body 52 of the cable 50 a and the inside of the closure 20. As the gas supplied from the gas supply device 60, the gas from which moisture has been removed is used in order to protect the core wire 51 from rust. For example, the gas is air.

  A gas stopper 53 is provided at the end of the cable 50a that comes out on the ground on the house side. Thereby, the gas is held in the cable 50 a and the closure 20. The gas supply device 60 sets the inside of the cable 50a and the closure 20 to a positive pressure.

  The sealing portion 22 of the closure 20 configured as described above has a gas leakage hole 30 (see FIG. 6) vacant due to aging, and gas leakage occurs. Here, the gas leakage hole 30 is a gap that is vacant between the stacks of overlapping airtight tapes that constitute the seal portion 22.

  Hereinafter, the repair tool 1 and the repair material 7 used for repairing the gas leakage hole 30 vacated in the above-described closure 20 will be described.

  As shown in FIG. 1, the repair instrument 1 has a base portion 2 and an insertion portion 3.

  The base 2 is formed in a shape that can be operated by an operator. The base 2 has a contact surface 6. The insertion portion 3 is provided so as to extend on the contact surface 6. The contact surface 6 restricts the movement of the repair tool 1 by contacting the outer surface 24 of the seal portion 22 when the insertion portion 3 is inserted into the gas leakage hole 30.

  The base 2 is formed in a rod shape. For example, the base 2 is formed with a thickness that is easy to operate when the operator holds it. The base portion 2 is formed in a rod shape that is slightly reduced in diameter toward the insertion portion 3.

  The insertion portion 3 is formed in a rod shape that is long in one direction. And the insertion part 3 has the end surface part 4 in the front-end | tip. The end surface portion 4 includes a pair of holding portions 5 that hold the repair material 7. A part of the repair material 7 held by the holding unit 5 is exposed to the outside in a direction facing the inner wall of the gas leakage hole 30. That is, the end surface portion 4 exposes a part of the repair material 7 to the outside in a direction facing the inner wall of the gas leak hole 30 and abuts the repair material 7 in the pushing direction into the gas leak hole 30.

  The insertion portion 3 is formed shorter than the distance from the outer surface 24 of the seal portion 22 of the closure 20 to the core wire 51 disposed in the internal space 83.

  In the present embodiment, as shown in FIGS. 1 and 5, the length L <b> 1 of the insertion portion 3 is configured to be shorter than the distance L <b> 2 from the outer surface 24 of the seal portion 22 to the core wire 51. For example, when the distance from the outer surface 24 of the seal portion 22 to the core wire 51 is 56 mm, the length L1 of the insertion portion 3 is formed to be 56 mm or less.

  Moreover, the insertion part 3 is formed so that the repair material 7 can be pushed between the air tight tapes with which the seal part 22 overlaps. For example, the diameter of the insertion portion 3 is 2.5 mm.

  The insertion portion 3 has a strength that does not easily bend when inserted between overlapping air tight tapes. Further, the insertion portion 3 is formed of a material having a strength capable of being inserted between overlapping air tight tapes against the radial pressure of the fixing portion 91. The insertion part 3 is formed of a metal material, for example.

  The end surface portion 4 has a surface on which the repair material 7 can be pushed into the gas leakage hole 30. In this embodiment, the end surface part 4 is formed in a concave curved surface.

  The holding part 5 is formed so as to hold the repair material 7 provided on the end face part 4. The holding part 5 has a configuration in which at least a part of the repair material 7 is exposed to the outside. Here, holding means that the repair material 7 having adhesiveness is maintained on the surface of the holding part 4 by sticking to the surface of the holding part 5.

  Specifically, the holding portion 5 extends from the edge of the end surface portion 4 along the longitudinal direction. The holding part 5 is formed in a pair of protrusions provided to be separated from each other. In other words, the holding part 5 has a shape in which the end part of the insertion part 3 is bifurcated. The holding unit 5 has a configuration that is chamfered and does not damage the inner wall of the gas leakage hole 30.

  Next, the repair material 7 used for repairing the gas leak hole 30 will be described.

  The repair material 7 is formed so that the gas leakage hole 30 vacated in the seal portion 22 can be closed by an adhesive force. The repair material 7 has adhesiveness and deformability, and is formed so as to be held in the insertion portion 3. The repair material 7 is a sealing material that hermetically closes the gas leakage hole 30. The repair material 7 is formed, for example, from unvulcanized butyl rubber in a tape shape.

  Next, a gas leakage hole repair method using the repair tool 1 will be described with reference to FIGS.

  FIG. 6 is an explanatory diagram showing the configuration of the closure 20 in which the gas leak hole 30 is vacant, and FIG. 7 is an explanatory diagram showing the configuration of the closure 20 in which the repair instrument 1 is inserted into the gas leak hole 30. FIG. 8 is an explanatory view showing a configuration of the closure 20 in which the gas leak hole 30 is closed, and FIG. 9 is a flowchart showing a gas leak hole repairing method using the repair instrument 1.

  As shown in FIG. 9, first, the operator applies soapy water to the outer surface 24 of the seal portion 22 of the closure 20, and confirms the position of the gas leak hole 30 (ST1). Next, the operator takes a predetermined amount of the repair material 7. The predetermined amount of the repair material 7 is an amount that can be pushed into the gas leak hole 30 at a time in consideration of the size of the gas leak hole 30, the gas leak condition, and the like.

  Next, the operator sets the repair material 7 on the end surface portion 4 of the insertion portion 3 in the repair tool 1 so as to be held by the holding portion 5 (ST2). As shown in FIG. 6, the operator aligns the insertion portion 3 of the repair instrument 1 with the position of the gas leakage hole 30.

  Next, as shown in FIG. 7, the operator inserts the insertion portion 3 of the repair tool 1 into the gas leakage hole 30 (ST3). At this time, if the gas leakage hole 30 is smaller than the thickness of the insertion portion 3, the gas leakage hole 30 is expanded against the radial pressure of the fixing portion 91 by the insertion portion 3 to be inserted. It is done.

  The repair material 7 is inserted into the inside of the gas leak hole 30 and moved to the back side of the gas leak hole 30, that is, the inner space 83 side by being pushed by the end face part 4.

  Next, if the insertion part 3 of the repair tool 1 is inserted to a predetermined position inside the gas leakage hole 30, the insertion part 3 is pulled out from the gas leakage hole 30 (ST4). At this time, as shown in FIG. 8, the repair material 7 remains between the air tight tapes where the seal portions 22 overlap without being pulled out from the gas leakage holes 30 while being adhered to the insertion portion 3. Specifically, the repair material 7 exposed to the outside from the end face portion 4 adheres to the inner wall of the gas leakage hole 30. As a result, the repair material 7 is peeled off from the end surface portion 4 of the repair tool 1 and remains inside the gas leakage hole 30.

  Further, when the insertion portion 3 is completely pulled out from the gas leak hole 30, the gas leak hole 30 is contracted by the radial pressure by the fixing portion 91 and the restoring force of the air tight tape. The repair material 7 remaining in the gas leakage hole 30 is sandwiched between the air tight tapes with which the seal portion 22 overlaps and is crushed. The repair material 7 closes the gas leakage hole 30 by the adhesive force.

  Next, the operator uses soapy water again to check for gas leakage. When the operator confirms that there is no gas leakage (YES in ST5), the worker ends the work. On the other hand, when the gas leak is confirmed again (NO in ST5), the process returns to ST2. The worker repeats the above work until no gas leak can be confirmed. When the operator confirms that the gas leak has disappeared, the repair work is finished.

  The result of the durability test of the closure 20 repaired by such a gas leak hole repair method will be described with reference to FIG.

  The durability performance of the closure 20 was evaluated using an accelerated deterioration test. Here, the accelerated deterioration test is a so-called heat cycle test. Specifically, the test evaluates the performance of the closure 20 from the change in pressure inside the closure 20 when the repaired closure 20 is exposed to an environment where the temperature environment repeatedly changes between 60 ° C. and −20 ° C. To do.

  FIG. 10 shows the result of the accelerated deterioration test of the closure 20. In FIG. 10, the horizontal axis represents time, the right vertical axis represents temperature (° C.), and the left vertical axis represents gas pressure (kPa) in the closure. In FIG. 10, the solid line waveform indicates the gas pressure in the closure, and the broken line waveform indicates the temperature.

  As shown in FIG. 10, the closure 20 after repairing the gas leakage hole 30 has a temperature change between 60 ° C. and −20 ° C. once, and the gas pressure in the closure 20 even when the temperature change is given 13 times. There is no decline in Therefore, it can be seen that the repaired closure 20 functions well.

  In general, a closure having a performance capable of withstanding a temperature change of 10 times or more is evaluated as having a durability of about two years in an actual environment. Therefore, it can be evaluated that the closure 20 in which the gas pressure does not decrease even when the temperature change is applied 13 times has a durability of about two years in an actual environment. Therefore, it was shown that the above gas leak hole repair method is effective as a gas leak repair method for the closure 20.

  Thus, according to the repair tool 1 of the present embodiment, the gas leakage hole 30 vacated in the seal portion 22 can be easily repaired. Moreover, the insertion portion 3 of the repair instrument 1 is formed to be shorter than the distance from the outer surface 24 of the seal portion 22 of the closure 20 to the core wire 51 disposed in the internal space 83. Therefore, the insertion portion 3 does not come into contact with the core wire 51 exposed inside the closure 20 to damage the core wire 51.

  Further, the holding part 5 provided on the end face part 4 of the insertion part 3 is formed with a curved corner. For this reason, the repair tool 1 can push the repair material 7 into the gas leakage hole 30 without damaging the seal portion 22.

  Moreover, the holding | maintenance part 5 is formed in a pair of protrusion shape provided mutually spaced apart. For this reason, the holding | maintenance part 5 can hold | maintain the repair material 7 in the groove | channel between the protrusions which oppose. On the other hand, since the repair material 7 is partially exposed to the outside from the groove between the protrusions, the repair material 7 can adhere to the inner wall of the gas leak hole 30 inside the gas leak hole 30. For this reason, the repair tool 1 can easily adhere the repair material 7 to the gas leak hole 30 by pulling out the insertion portion 3 from the gas leak hole 30.

  The base 2 has an abutment surface 6 that abuts on the outer surface 24 of the seal portion 22. For this reason, when the insertion portion 3 is inserted into the gas leakage hole 30, the base portion 2 contacts the outer surface 24 of the seal portion 22 before the insertion portion 3 reaches the internal space 83. Thereby, the contact surface 6 of the base 2 can regulate the movement of the repairing instrument 1 in the pushing direction.

  Further, according to the gas leakage hole repairing method using the repair tool 1 configured as described above, the gas leakage can be repaired without replacing the closure 20 against the gas leakage from the seal portion 22. it can. Further, in this gas leakage hole repairing method, the work can be performed in a state where the gas is supplied into the closure 20, and therefore the work is simple.

  The gas leakage hole repair method is a method of pushing the repair material 7 into the gas leakage hole 30. Even if the gas leak hole 30 is not blocked by a single repair operation, the repair material 7 can be pushed into the gas leak hole 30 a plurality of times. Therefore, the gas leakage hole 30 can be reliably closed.

  The present invention is not limited to the above embodiment. For example, the shape of the insertion portion 3 is not limited to the above shape. For example, the insertion portion 3 can be configured as shown in FIGS.

  FIG. 11 shows a first modification of the insertion portion 3. In the first modification, the insertion portion 3A includes a planar end surface portion 4A and a pair of protruding holding portions extending along a longitudinal direction of the insertion portion 3A from a part of the end surface of the end surface portion 4A. 5A. The holding part 5A is opposed via the end face part 4A in between.

  FIG. 12 shows a second modification of the insertion portion 3. In the second modification, the insertion portion 3B has a configuration in which the bottom of the insertion portion 3B is formed into a hemispherical shape so that the bottom is an end surface portion 4B and the holding portion 5B is provided around the end surface portion 4B.

  FIG. 13 shows a third modification of the insertion portion 3. In the third modified example, the insertion portion 3C has four protrusion-like holdings extending along the longitudinal direction of the insertion portion 3C from between the band-shaped end surface portion 4C formed orthogonal to each other and the end surface portion 4C. It is the structure which has part 5C.

  In addition to the above, the insertion portion 3 exposes a part of the repair material 7 to the outside in a direction facing the inner wall of the gas leakage hole 30 and also contacts the repair material 7 in the direction in which the repair material 7 is pushed. If it is the structure which has a part, it can deform | transform variously.

  For example, in this embodiment, although the gas leak hole 30 of the seal part 22 of the closure 20 which seals one communication cable 50 is made into repair object, it is not restricted to this. That is, as shown in FIG. 14, the repair tool 1 can be used to repair the gas leakage hole 30 vacated in the seal portion 22 of the closure that collectively seals the two communication cables. Similarly, a closure that collectively seals three or more communication cables can be repaired using the repair tool 1.

  In addition, for example, the repair material 7 can use the other adhesive as long as it can close the gas leak hole 30 and can be pushed into the gas leak hole 30 using the repair tool 1.

  Moreover, although the repair tool 1 is configured to connect the base 2 and the insertion part 3, the repair tool 1 is not limited to this configuration, and the base 2 and the insertion part 3 may be integrally formed.

  In addition, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Repair tool, 2 ... Base part, 3 ... Insertion part 3A ... Insertion part 3B ... Insertion part 3C ... Main part, 4 ... End surface part, 4A ... End surface part, 4B ... End surface part, 4C ... End surface part, 5 ... Holding Part, 5A ... holding part, 5B ... holding part, 5C ... holding part, 6 ... contact surface, 7 ... repair material, 10 ... communication equipment, 20 ... closure, 21 ... main body part, 22 ... seal part, 23 ... valve 24 ... Outer surface, 25 ... Inner surface, 30 ... Gas leak hole, 40 ... Communication device, 50 ... Communication cable, 51 ... Core wire, 52 ... Outer body, 53 ... Gas stopper, 60 ... Gas supply device, 70 ... Terminal device 80 ... barrel, 80a ... first barrel, 80b ... second barrel, 81 ... end plate, 81a ... first plate, 81b ... second plate, 82 ... band, 83 ... internal space, 90 ... hole , 91 ... fixed part, 92 ... convex part, 100 ... communication building, 200 ... manhole.

Claims (4)

A base portion having a contact surface that contacts the main surface of the seal portion of the closure having a seal portion that is cylindrically stacked around the cable and has a main surface exposed to the outside;
A part of the adhesive repair material that extends from the abutting surface and is pushed into the gas leak hole vacated in the seal portion is exposed to the outside in a direction facing the inner wall of the gas leak hole. And the insertion part which has an end surface part which contacts the repair material in the pushing direction,
A repair instrument comprising:   The repair instrument according to claim 1, wherein the insertion portion is formed to be shorter than a length from the main surface to a core line disposed inside the closure.   The repair device according to claim 1, wherein the end surface portion is provided with a pair of holding portions that hold the repair material extending from an end surface in contact with the repair material in a pushing direction. A gas leakage hole repairing method for repairing a gas leakage hole vacant in the sealing portion of the closure having a sealing portion that is laminated in a cylindrical shape around the cable and has a main surface exposed to the outside,
A part of the repair material having adhesiveness is exposed to the outside in the direction facing the inner wall of the gas leakage hole on the end surface portion of the insertion portion in the repair tool according to any one of claims 1 to 3. A step of adhering, and
Pushing the repair material into the gas leak hole at the end face by inserting the insertion part into the gas leak hole;
Closing the gas leakage hole with the repair material by pulling out the insertion portion from the gas leakage hole;
A method for repairing gas leakage holes.