WO2019229707A1

WO2019229707A1 - Repair method for closure, and repair device

Info

Publication number: WO2019229707A1
Application number: PCT/IB2019/054511
Authority: WO
Inventors: 桑原研爾; 松本研二; 小林弘幸; 髙須憲吾; 矢崎明彦; 難波吉昭; 久木元浩二
Original assignee: コーニングリサーチアンドディヴェロップメントコーポレイション
Priority date: 2018-06-01
Filing date: 2019-05-31
Publication date: 2019-12-05
Also published as: JP7231976B2; JP2019213315A

Abstract

Provided are a repair method for a closure and a repair device that are advantageous for construction with a reduced space. This repair method is for a closure 1 provided with a cylindrical sleeve 2 that contains a cable C and end plates 4 installed at both ends of the sleeve 2, wherein a pipe 77 having a jetting port Na is inserted into a hole formed in the sleeve 2, a sealing material S in at least one of a liquid form and a powder form is jetted from the jetting port Na to form a sealing section La on at least a portion of inner surfaces 1a, 1b of the closure 1, and after the sealing section La has been formed, the pipe 77 is removed from the hole and the hole is closed.

Description

Closure repair method and repair device

The present invention relates to a closure repair method and a repair device.

Patent Document 1 discloses a gas leakage repair method that can suppress the gas leakage of the closure without dismantling the closure and can maintain the suppression effect for a long time. In addition, in paragraph “0030” of Patent Document 1, “According to such a gas leakage repairing method using the gas leakage repair tool 10 or 10A, the cable outer periphery sealing member 20 is attached to the communication cable L outside the closure 1. A step of closely contacting and winding the outer peripheral surface, a step of closely covering the outer periphery of the cable outer peripheral sealing member 20 and covering the entire end surface of the closure 1 on the end surface of the closure 1; There is a step of surrounding the outer periphery of the member 21 with a pressing tool 30 that presses the entire sealing member 21 against the end face of the closure 1 and pressing the entire sealing member 21 with the pressing tool 30. Gas leakage from the seal part between the outer periphery of the 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 cable L is made of polyethylene or the like and is difficult to adhere to 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. And the deterrent effect can be sustained for a long time. "

Japanese Patent Laid-Open No. 2006-63656

In the conventional gas leakage repair method, a sealing member is installed outside the closure. When the sealing member is installed outside the closure, the structure for supporting the sealing member on the outside of the closure tends to be large in order to resist the pressure of the leaking gas, which is unsuitable for construction in a space-saving manner.

One aspect of the present invention is a method of repairing a closure including a cylindrical sleeve that accommodates a cable and end face plates installed at both ends of the sleeve, wherein a hole having a pipe having an injection port is provided in the sleeve. And at least one of liquid and powdery sealing material is injected from the injection port to form a sealing part on at least a part of the inner surface of the closure, and after forming the sealing part, the pipe is removed from the hole. Close the hole after unplugging the pipe.

One aspect of the present invention is a repair device used for repairing a closure, a spray can storing at least one liquid or powder-like sealing material in a pressurized state, and a nozzle for injecting the sealing material The spray can is connected to the tube through which the sealing material passes, and the flow path of the sealing material is opened when pressed, and the flow path is closed when the pressure is released. The nozzle unit includes an actuator attached to the check valve and a pipe attached to the actuator and connected to the flow path of the check valve via the actuator. An injection port through which the stopping material is injected is formed.

One aspect of the present invention is a repair device used for repairing a closure, which injects compressed air and at least one of a liquid and powdery sealing material, and is connected to the nozzle unit. A first path through which the sealing material passes, and a second path connected to the nozzle unit and through which the compressed air passes, wherein the nozzle unit is connected to the first path. And a second pipe connected to the second path, the first pipe having an injection port for injecting the sealing material, and the second pipe having an injection port for injecting the compressed air. The direction of the injection port of the first pipe intersects the direction of the injection port of the second pipe.

Favorable for space-saving closure repair work.

FIG. 1 is a perspective view showing an example of a closure. FIG. 2 is a perspective view of the closure showing a state in which the first repair method for the closure is performed. FIG. 3 is a schematic side view showing a state in which the first repair method of the closure is being performed, with the closure partially broken. FIG. 4 is a cross-sectional view showing the repair device according to the first embodiment. FIG. 5 is a side view showing a first modification of the nozzle unit. FIG. 6 is a side view showing a second modification of the nozzle unit. It is a figure which shows typically the process of the 1st repair method of a closure. It is a figure which shows typically the process of the 2nd repair method of a closure. It is explanatory drawing which shows the repair apparatus which concerns on 2nd Embodiment. It is explanatory drawing which shows the repair method using the repair apparatus which concerns on 2nd Embodiment. It is explanatory drawing which shows the repair apparatus which concerns on 3rd Embodiment. It is explanatory drawing which shows the repair apparatus which concerns on 4th Embodiment.

A closure repair method according to one aspect of the embodiment is a closure repair method including a cylindrical sleeve that accommodates a cable and end face plates installed at both ends of the sleeve, and includes a pipe having an injection port. Inserted into a hole provided in the sleeve, and at least one of liquid and powdery sealing material was injected from the injection port to form a sealing part on at least a part of the inner surface of the closure, thereby forming the sealing part The pipe is later removed from the hole, and the hole is closed after the pipe is removed.

Usually, a constant internal pressure is applied to the closure, and the infiltration of moisture from the outside is prevented and the dry state is maintained. In the above repair method, the sealing portion is formed not on the outer surface of the closure but on the inner surface. The internal pressure in the closure acts to press the sealing portion against the inner surface of the closure, and the sealing portion is unlikely to peel off from the inner surface of the closure. As a result, an additional structure for holding the sealing portion is not necessary, and in particular, the apparatus and work to be installed outside the closure are simplified, which is advantageous for space-saving repair work.

In the above repair method, after the gas leakage portion is generated, the sealing portion is formed to block the gas leakage portion, so that the gas leakage can be stopped efficiently and stably.

In the above repair method, before the gas leakage portion occurs, the sealing portion is formed to prevent the gas leakage from the inside of the closure, which is effective in preventing the gas leakage.

In the repair method described above, the sealing portion can be formed on the inner surface of the end face plate by spraying the sealing material toward the end face plate within the sleeve. A through hole through which the cable is inserted is formed in the end face plate. This through hole is closed after the cable is passed through, but gas leakage is likely to occur compared to other portions in the closure. Therefore, the leakage of gas can be effectively repaired by forming the sealing portion on the inner surface of the end face plate.

In the repair method described above, the hole is a valve stem that houses the valve core. The valve core is pulled out from the valve stem to open, a pipe is inserted into the opened valve stem, and a sealing portion is formed. After the pipe is pulled out, the valve stem can be closed by installing the valve core in the valve stem. By using the valve stem, a hole for inserting a pipe can be easily formed. Further, the valve stem can be easily closed by incorporating the valve core.

In the above repair method, it is possible to form a hole in the sleeve, insert a pipe into the hole, form the sealing portion, then pull out the pipe from the hole, and close the hole after removing the pipe. The degree of freedom of the place where the hole for inserting the pipe is formed is increased, and the sealing portion can be easily formed aiming at a desired place.

When the sleeve has a flat part, the hole for inserting the pipe can be formed in the flat part in the above repair method. By forming the hole in the flat part instead of the curved part or the uneven part of the sleeve, an appropriate hole for inserting the pipe can be easily formed.

As the sealing material for the above repair method, an adhesive that adheres to at least one of the inner surfaces of the closure and cures to form a sealing portion can be used. By forming the sealing portion with an adhesive that adheres to the inner surface of the closure and cures, the sealing portion can be easily formed over a wide range.

As the sealing material for the repair method described above, powder that fills the gas leakage portion and forms the sealing portion can be used. When the powder is sprayed toward the gas leakage portion, the powder is sucked into the leakage portion and buried in the gas leakage portion, so that the sealing portion can be easily formed.

The sealing material used in the above repair method may be formed by mixing the main agent and the curing agent. A sealing material can be formed by mixing the main agent and the curing agent, and the sealing material can be sprayed to form a sealing portion.

The present invention relates to a repair device that is used for repairing a closure, and includes a spray can that stores at least one liquid or powder-like sealing material in a pressurized state, and sprays the sealing material. A nozzle unit. The spray can includes a tube through which the sealing material passes, a backflow prevention valve that is connected to the tube and that opens the flow path of the sealing material when pressed and closes when the pressure is released. Yes. The nozzle unit includes an actuator attached to the backflow prevention valve and a pipe attached to the actuator and connected to the flow path of the backflow prevention valve via the actuator, and a sealing material is injected into the pipe. An injection port is formed.

This repair device can be used for the above-described repair method of the closure. That is, the pipe of the nozzle unit is inserted into the hole formed in the sleeve, and a sealing material is injected from the injection port through the pipe to form a sealing portion on at least a part of the inner surface of the closure. After forming, the pipe can be withdrawn from the hole and the hole can be closed after the pipe has been withdrawn.

The pipe of the nozzle unit may include one end connected to the actuator, the other closed end, and an injection port formed on the side. Since the injection port is formed on the side portion of the pipe, the sealing material is injected in a direction intersecting the axis of the pipe. Therefore, for example, it becomes easy to inject the sealing material aiming at the side which is the direction intersecting the axial direction of the pipe.

The pipe of the nozzle unit includes one end connected to the actuator, the other end opened as an injection port, and a curved portion curved between the one end and the other end. I have. An axis passing through the other end can intersect an axis passing through one end. The sealing material is injected in a direction intersecting with an axis passing through one end of the pipe. Therefore, it becomes easy to inject, for example, aiming at the side that is a direction intersecting the axial direction of the pipe.

A repair device used for repairing a closure according to one aspect of the embodiment, which includes a nozzle unit that injects compressed air and at least one of a liquid and a powdery sealing material, and a nozzle unit. A first path through which the sealing material passes and a second path through which the compressed air passes are connected to the nozzle unit. The nozzle unit includes a first pipe connected to the first path and a second pipe connected to the second path. The first pipe includes an injection port for injecting the sealing material. The second pipe has an injection port for injecting compressed air. The direction of the injection port of the first pipe intersects the direction of the injection port of the second pipe.

This repair device can be used in the above-mentioned closure repair method. When this repair device is used, the first pipe and the second pipe of the nozzle unit are inserted into holes formed in the sleeve. In the closure, the sealing material injected from the injection port of the first pipe spreads in a mist shape by the compressed air injected from the injection port of the second pipe, and a sealing portion is formed on at least a part of the inner surface of the closure. Form. The first pipe and the second pipe are removed from the holes after the sealing portion is formed.

The repair device includes a tank in which a sealing material is stored, and a compressor that supplies compressed air to the second pipe. The first path is connected to the first pipe and the tank, and the second path The path may be connected to the second pipe and the tank. The sealing material stored in the tank passes through the first path, reaches the first pipe, and is injected from the injection port of the first pipe. The compressed air passes through the second path and reaches the second pipe by the compressor, and is injected from the injection port of the second pipe.

In the above repair device, of the main agent and the hardener that are mixed with each other and become a sealing material, the first tank in which the main agent is stored, the second tank in which the hardener is stored, and the first path And a mixer for mixing the main agent and the curing agent, wherein the first path is connected to the mixer and the first tank, and the first introduction pipe line through which the main agent passes, the mixer and the first The second introduction pipe line that is connected to the second tank and through which the curing agent passes, and the merging pipe line that is connected to the mixer and the first pipe and through which the sealing material passes may be provided. The main agent and the curing agent are mixed by the mixer, reach the first pipe, and are injected from the injection port of the first pipe.

Note that the term “repair” in this specification includes eliminating gas leakage from the closure, reducing leakage to the extent that there is no problem in use, and preventing gas leakage from the closure. It also includes measures against gas leaks from closures. There are various types of closures. Specifically, the closure which protects the connection part of the cable for communication can be mentioned, and a closure protects the connection part of the cable extended in underground, for example.

First, the structure of the closure will be described. For example, the closure is a mechanical closure for a metal communication cable. As shown in FIG. 1, the closure 1 includes two half sleeves 21 having a semicylindrical shape, and the two half sleeves 21 are fixed to each other with screws 3 to form a cylindrical sleeve 2. The closure 1 has a cylindrical shape as a whole, and the sleeve 2 constitutes a side surface of the closure 1. The sleeve 2 accommodates connection portions of at least two cables C. The material of the sleeve 2 is, for example, polypropylene.

The sleeve 2 includes a plurality of ribs 2a. The plurality of ribs 2a are juxtaposed along the longitudinal direction of the closure 1 (the axial direction of the closure 1, the extending direction of the cable C). Each rib 2 a extends annularly along the circumferential direction of the closure 1. The screws 3 are arranged side by side along the longitudinal direction of the closure 1. In the following description, the axial direction of the closure 1, the radial direction of the closure 1, and the circumferential direction of the closure 1 may be simply referred to as an axial direction, a radial direction, and a circumferential direction, respectively.

The outer periphery of the sleeve 2 is provided with a circular flat portion 2b avoiding the rib 2a. The flat portions 2b are provided at two locations near both ends of the sleeve 2 in the longitudinal direction. One flat portion 2b is provided with a check valve 6. The check valve 6 has a cylindrical valve stem 61 provided so as to communicate the inside and outside of the sleeve 2, and a valve core 62 (also referred to as “plunger”) that is detachably accommodated in the valve stem 61. And. A tube can be attached to the check valve 6 and compressed air can be supplied into the closure 1 through the tube.

A disc-shaped end plate 4 is installed at both ends of the closure 1 in the longitudinal direction, and the sleeve 2 is sealed by the two end plates 4. The end face plate 4 includes a circular through hole 4a through which the cable C passes. The diameter of the through hole 4a is larger than the outer diameter of the cable C. The end face plate 4 is formed by bolting two semicircular side wall members 4b.

A sealing tape is interposed between the two side wall members 4b, and the sealing tape ensures airtightness between the two side wall members 4b. This sealing tape has a putty shape, for example, and butyl rubber is an example of a material for the sealing tape.

The cable C is wrapped with an air tight tape T that closes the gap between the through hole 4a of the end face plate 4 and the cable C. The air tight tape T is made of rubber. For example, the material of the air tight tape T is EPDM (ethylene / propylene / diene rubber). The air tight tape T may be made of peroxide-crosslinked EPDM. The air tight tape T is wound around the outer periphery of the cable C by a plurality of layers. And when the outer peripheral surface of the air tight tape T located on the outermost radial direction is in close contact with the inner peripheral surface of the through hole 4a, the gap between the cable C and the end face plate 4 is sealed.

Depending on the number of cables C extending from the closure 1 or the type of the cables C, the shape and number of the end face plates 4 and the through holes 4a can be changed as appropriate. There are various types of end face plates 4. For example, the cable C may extend from the cable connection portion into two or three, and in such a case, the number of through holes 4a provided in the end face plate 4 is two or three.

Internal pressure is applied inside the closure 1. Specifically, pressurized nitrogen gas or gas such as air is supplied into the sleeve 2 through the cable C, and the inside of the sleeve 2 is at a higher pressure than the atmospheric pressure by this gas. As a result, the infiltration of moisture into the inside of the sleeve 2 is prevented, and the inside of the sleeve 2 is maintained in a dry state. In addition, a gasket is provided between the sleeve 2 and the end face plate 4 to keep it airtight.

A band member 5 is wound around the outer periphery of the sleeve 2, and a plurality of band members 5 are juxtaposed in the longitudinal direction of the closure 1. The plurality of band members 5 are provided to fasten the sleeve 2 having a high atmospheric pressure with screws 3 from the outside, and are made of, for example, stainless steel.

In the closure 1, gas may leak from the inside of the closure 1 due to deterioration over time. Here, an example of a repair device for the closure 1 used to prevent gas leakage will be described with reference to FIGS. The repair device 7 according to the first embodiment includes a spray can 71 and a nozzle unit 72 </ b> A attached to the spray can 71.

The spray can 71 includes a can body 73 that stores the sealing material S, a tube 74 that is disposed in the can body 73 and through which the sealing material S passes, and a backflow prevention valve 75 that is connected to the tube 74. Yes. The can body 73 stores, as contents, a sealing material S that is at least one of liquid and powder and a propellant P for holding the sealing material S in a pressurized state. The propellant P is a gas at room temperature, but becomes a liquid when pressure is applied. For example, alternative chlorofluorocarbon or LPG can be used. Further, the sealing material S is a material that can form a sealing portion La that stops gas leakage, and a material that has a viscosity that is low enough to enable injection from the spray can 71 can be used.

As the liquid sealing material S, for example, a reaction adhesive, a solution adhesive, or a solid adhesive can be used. The reactive adhesive is, for example, a one-component or two-component epoxy adhesive, an acrylic adhesive, or a urethane adhesive. The solution adhesive is, for example, an aerosol type adhesive. The solid adhesive is, for example, a hot melt adhesive. Further, as the powdery sealing material S, for example, fine particles having no adhesiveness, for example, silica gel, glass beads, talc (talc) and the like can be used.

The backflow prevention valve 75 is connected to the tube 74. When the backflow prevention valve 75 is pressed, the flow path of the sealing material S is opened, and when the pressure is released, the flow path is closed. Specifically, the backflow prevention valve 75 includes a cylindrical housing 75a fixed to the can body 73, a stem 75b housed in the housing 75a and fixed to the housing 75a via a stem spring 75c, and a housing 75a. And a stem gasket (not shown) that closes the gap between the stem 75b and the stem 75b. A tube 74 through which the sealing material S passes is connected to the end (lower part) of the housing 75a.

Sealing material S is stored in can body 73 in a pressurized state. When the stem 75b is pushed in so as to compress the stem spring 75c, the hole formed in the side surface of the stem 75b is opened, and the flow path of the sealing material S is opened. As a result, the sealing material S passes through the tube 74, the housing 75a, and the stem 75b and is discharged from the upper end of the stem 75b. When the pressure on the stem 75b is released, the stem 75b returns to the original position, the hole is closed, and the flow path of the sealing material S is closed.

The nozzle unit 72A includes an actuator 76 attached to the stem 75b of the check valve 75 and a pipe 77 attached to the actuator 76. The actuator 76 has a flow path 76 a that connects the stem 75 b and the pipe 77. The pipe 77 is connected to the backflow prevention valve 75 via the flow path 76 a of the actuator 76. When the stem 75b is pressed as if the actuator 76 is pushed in, the flow path of the backflow prevention valve 75 is opened, and when the pressure is released, the flow path is closed.

One end 77a of the pipe 77 is opened and fitted into the actuator 76. The other end 77b of the pipe 77 is opposite to the one end 77a and is closed. In the following description, of the both ends 77a and 77b of the pipe 77, one end 77a connected to the actuator 76 may be referred to as a base end, and the other end 77b may be referred to as a tip.

The pipe 77 extends along a linear axis Ax passing through the base end portion 77a. An injection port Na for the sealing material S is formed on the side surface in the vicinity of the tip 77 b of the pipe 77. That is, in the pipe 77, a through hole serving as the injection port Na is formed in the side portion 77c instead of the closed tip portion 77b. The number of the injection holes Na is not limited to a single number, and may be plural. In addition, as shown in FIG. 5, a nozzle unit 72B (first modification) including a pipe 77 whose tip 77b is opened as an injection port Na can also be used.

Further, the pipe is not limited to a form in which the entire region from the base end portion to the tip end portion is linearly continuous, and may be partially curved. For example, the nozzle unit 72C according to the second modification can also be used (see FIG. 6). A nozzle unit 72C according to the second modification includes a pipe 78 that is partially curved. The pipe 78 includes a proximal end portion 78a connected to the actuator 76 and a distal end portion 78b opened as the injection port Na. In addition, the pipe 78 extends along the first axis Ax between the base end portion 78a and the tip end portion 78b, assuming a linear axis (first axis) Ax passing through the base end portion. The linear part 78d which exists, and the

curved parts

78f and 78g curved with respect to the linear part 78d are provided. The

curved portions

78f and 78g are provided at two locations. The first curved portion 78f provided in the vicinity of the distal end portion 78b is curved so as to be substantially L-shaped with respect to the straight portion 78d, and the second curved portion provided near the center in the longitudinal direction of the pipe 78. The curved portion 78g is curved so as to be substantially U-shaped with respect to the straight portion 78d.

Here, an axis (second axis) Ay extending linearly through the tip 78f of the pipe 78 is assumed. The second axis Ay intersects the first axis Ax by providing the substantially L-shaped first curved portion 78f. As a result, the direction of the flow of the sealing material S passing through the straight part 78d is changed by the first curved part 78f, and is injected from the injection port Na of the tip part 78b.

The second curved portion 78g is provided to protrude in the same direction as the injection direction of the sealing material S with respect to the straight portion 78d. The repair operator can recognize the direction in which the second curved portion 78g protrudes from the straight portion 78d as the injection direction of the sealing material S by checking the second curved portion 78g. That is, the second curved portion 78g functions as a mark portion for confirming the injection direction of the sealing material S. The repair operator can change the direction of the injection port Na by picking the second curved portion 78g with a finger and rotating the pipe 78 around the straight portion 78d. That is, the second bending portion 78g functions as an operation portion for the repair worker to change the direction of the ejection port Na.

(First repair method)
An example of a method for repairing the closure 1 will be described with reference to FIGS. 2, 3 and 7. In the closure 1, gas may leak from the inside of the closure 1 due to aging or the like. There is a high possibility that the gas leakage portion L is generated between the cable C and the through hole 4a (where the air tight tape T is provided). In this case, the leakage portion L occurs on the inner surface 1 a of the end face plate 4 among the

inner surfaces

1 a and 1 b of the closure 1. In addition, the leakage part L may arise in places other than between the cable C and the through-hole 4a. For example, when gas leaks due to damage to the sleeve 2, the leakage portion L is generated on the inner surface 1 b of the sleeve 2 among the

inner surfaces

1 a and 1 b of the closure 1.

When gas leakage from the leaking part L is detected, it is necessary to repair the gas leaking by closing the leaking part L. As a method for specifying the leakage portion L, for example, there is a method for confirming whether or not foaming is caused by attaching a liquid such as soapy water to the air tight tape T. Here, the first repairing method will be described by taking as an example a case where a leakage portion L is found on the inner surface 1a of the end face plate 4 closer to the check valve 6 provided in the closure 1 among the pair of end face plates 4. .

First, supply of gas to cable C from the gas supply equipment installed in a facility such as a telephone station is stopped, and the pressure in the closure 1 is changed to atmospheric pressure. In this state, the valve core 62 of the check valve 6 is detached from the valve stem 61, and the inside of the closure 1 is opened to the atmosphere. With the detachment of the valve core 62, the inside of the valve stem 61 is opened, and holes through which the

pipes

77, 78 of the

nozzle units

72A, 72B, 72C of the repairing device 7 can be inserted are formed.

Next, the

pipes

77 and 78 of the

nozzle units

72A, 72B and 72C are passed through the valve stem 61. The

pipes

77 and 78 are provided with an injection port Na. The injection port Na is provided so as to face sideways with respect to a linear axis Ax passing through the

base end portions

77a and 78a of the

pipes

77 and 78. The

pipes

77 and 78 are passed through the valve stem 61 so that the injection port Na faces the leakage portion L.

When the insertion of the

pipes

77 and 78 into the valve stem 61 is completed, the actuator 76 of the

nozzle units

72A and 72C is pushed in, and the sealing material S is injected from the injection port Na of the

pipes

77 and 78. The sealing material S diffuses in a mist form from the injection port Na. For example, when an adhesive is used as the sealing material S, the sealing material S adheres to the inner surface 1a of the end face plate 4 to form a layer. This layer hardens with time and forms the sealing portion La. The sealing portion La covers the leakage portion L and prevents gas leakage. Moreover, when powder is used as the sealing material S, the sealing material S diffused in the form of a mist enters and fills the leakage portion L, forms the sealing portion La, and closes the leakage portion L. As a result, gas leakage is prevented.

After forming the sealing portion La, the

pipes

77 and 78 of the nozzle unit 72A are removed from the valve stem 61. Next, the valve core 62 is attached to the valve stem 61, the valve stem 61 (hole) is closed, and the check valve 6 is restored. Next, a tube 74 is attached to the check valve 6, and compressed air is supplied into the closure 1 through the tube 74 to apply an internal pressure. The presence or absence of gas leakage from the leakage portion L is confirmed in a state where the internal pressure is applied to the closure 1. The presence or absence of gas leakage can be confirmed, for example, by detecting a change in internal pressure. If there is no gas leak, the gas supply to the cable C is resumed.

(Second repair method)
Next, with reference to FIG. 8, the repair method when the leaking part L is discovered by the inner surface 1a of the end surface plate 4 far from the check valve 6 among a pair of end surface plates 4 is demonstrated.

As in the first repair method, the supply of gas to the cable C connected to the closure 1 is first stopped and the pressure in the closure 1 is changed to atmospheric pressure. In this state, a hole 2c is formed through which the pipe passes through the flat portion 2b where the check valve 6 is not provided.

Next, the

pipes

77 and 78 of the nozzle unit 72A are passed through the holes. The

pipes

77 and 78 are provided with an injection port Na. The injection port Na is provided such that the injection port Na faces the side with respect to the linear axis Ax passing through the

base end portions

77a and 78a of the

pipes

77 and 78. And the

pipes

77 and 78 are penetrated in the hole 2c so that the injection port Na may oppose the leaking part L.

When the insertion of the

pipes

77 and 78 into the hole 2c is completed, the actuator 76 of the

nozzle units

pipes

77 and 78. The sealing material S diffuses in a mist form from the injection port Na, forms a sealing portion La, and closes the leakage portion L. As a result, gas leakage is prevented.

After forming the sealing portion La, the pipe of the nozzle unit 72A is removed from the hole. Next, the hole 2c is closed by filling the hole 2c with an amount of resin sealing material or attaching a lid member having a shaft portion screwed into the hole 2c to the hole 2c. Next, a tube 74 is attached to the check valve 6, and compressed air is supplied into the closure 1 through the tube 74 to apply an internal pressure. The presence or absence of gas leakage from the leakage portion L is confirmed in a state where the internal pressure is applied to the closure 1. If there is no gas leak, the gas supply to the cable C is resumed.

In the second repair method, since the hole 2c is formed in the flat portion 2b, the hole 2c for inserting the

pipes

77 and 78 is easily formed as compared with the case where the hole 2c is formed in the curved portion or the uneven portion of the sleeve 2. it can. On the other hand, the hole 2c for inserting the

pipes

77 and 78 can be formed at an arbitrary position corresponding to the position of the leakage portion L. For example, the leakage portion L may occur on the inner surface 1 b of the sleeve 2 instead of the inner surface 1 a of the end face plate 4. In such a case, the formation position of the hole 2c can be determined so that the sealing material S is appropriately jetted from the

pipes

77 and 78 inserted through the hole 2c toward the leakage portion L.

Next, the repair device 8 according to the second embodiment will be described with reference to FIG. The repair device 8 is connected to the nozzle unit 81, which is connected to the nozzle unit 81 which injects the sealing material S while injecting the compressed air, and the nozzle unit 81, and through which the sealing material S passes. And a second path 83 through which the compressed air passes.

The nozzle unit 81 is provided adjacent to the first pipe 84 through which the sealing material S passes, the second pipe 85 through which compressed air passes, the first pipe 84, and the first pipe 84. And a connector 86 for connecting and holding the two pipes 85. The connector 86 is formed with a first flow path 86 a communicating with the first path 82 and a first flow path 86 b communicating with the second path 83.

One end 84a of the first pipe 84 is attached to the connector 86 so as to communicate with the first flow path 86a. One end 85a of the second pipe 85 is attached to the connector 86 so as to communicate with the first flow path 86b. That is, the first pipe 84 is connected to the first path 82 via the first flow path 86 a of the connector 86. The second pipe 85 is connected to the second path 83 via the first flow path 86 b of the connector 86.

The other end 84b of the first pipe 84, that is, the end opposite to the one end 84a is open. The other end 84 b of the first pipe 84 is an injection port Na that injects the sealing material S. The other end 85b of the second pipe 85, that is, the end opposite to the one end 85a is closed. Hereinafter, one

end

84a, 85a of the first pipe 84 and the second pipe 85 may be referred to as a base end, and the

other end

84b, 85b may be referred to as a tip end.

The first pipe 84 and the second pipe 85 extend in a straight line along with each other. The second pipe 85 is longer than the first pipe 84. An injection port Nb is provided in the side portion 85c of the second pipe 85 in the vicinity of the tip end portion 84b (injection port Na) of the first pipe 84. The sealing material S is injected from the injection port Na of the first pipe 84. Compressed air is injected from the injection port Nb of the second pipe 85. The direction of the injection port Nb of the second pipe 85 intersects the direction of the injection port Na of the first pipe 84.

The direction of the injection port Na of the first pipe 84 means the injection direction of the sealing material S injected from the injection port Na of the first pipe 84. The direction of the injection port Nb of the second pipe 85 means the injection direction of the compressed air injected from the injection port Nb of the second pipe 85. In the present embodiment, the direction of the injection port Nb of the second pipe 85 and the direction of the injection port Na of the first pipe 84 are substantially orthogonal. However, the fact that the direction of the injection port Nb of the second pipe 85 and the direction of the injection port Na of the first pipe 84 intersect is not limited to a mode in which they are orthogonal to each other, and is injected from each of the injection ports Na and Nb. Widely includes a mode in which the sealing material S and the compressed air interfere with each other.

The first pipe 84 is connected to the connector 86. The connector 86 is formed with a first flow path 86 a connected to the first pipe 84. The first flow path 86a is connected to the first pipe line 82a, and the first pipe line 82a is connected to the tank 87 in which the sealing material S is stored. A pump 88 for pumping the sealing material S is installed on the first pipe line 82a. That is, the first pipe 84 is connected to the first pipe line 82a through the first flow path 86a of the connector 86, and the first pipe line 82a passes through the first pipe 82a through which the sealing material S passes. It is an example of a path 82. The first pipe 84 may be directly connected to the first pipe line 82a without the connector 86 interposed.

The second pipe 85 is connected to the connector 86. The connector 86 is formed with a first flow path 86 b connected to the second pipe 85. The first flow path 86 b is connected to the second pipe 83 a, and the second pipe 83 a is connected to the compressor 89. That is, the second pipe 85 is connected to the second pipe 83 a via the first flow path 86 b of the connector 86. The second pipe 83 a is an example of the second path 83 through which the compressed air generated by the compressor 89 passes. Note that the second pipe 85 may be directly connected to the second pipe 83a without the connector 86 interposed.

The sealing material S is injected from the injection port Na of the first pipe 84. Compressed air is injected from the injection port Nb of the second pipe 85. The compressed air interferes with the sealing material S and diffuses the sealing material S in a mist form. The direction in which the sealing material S is diffused in a mist (the direction in which the sealing material S is sprayed) depends on the direction of compressed air injection. In the present embodiment, a pump 88 for pumping the sealing material S is provided on the first pipe line 82a. However, the pump 88 can be omitted when a negative pressure is generated by the compressed air injected from the second pipe 85 and the sealing material S is so low in viscosity that it can be transferred by the negative pressure.

Next, the repair device 9 according to the third embodiment will be described (see FIG. 11). The repair device 9 according to the third embodiment includes the same structure and functional elements as the repair device 8 according to the second embodiment. Therefore, in the following description, it demonstrates centering around difference, the same code | symbol is attached | subjected to the same structure etc. and detailed description is abbreviate | omitted.

The repair device 9 includes a nozzle unit 91, a first path 82 connected to the nozzle unit 91, through which the sealing material S passes, a second path 83 connected to the nozzle unit 91, through which compressed air passes, It has.

The nozzle unit 91 includes a first pipe 94 connected to the first path 82, a second pipe 95 connected to the second path 83, and the first pipe 94 and the second pipe 95. And a connector 96 which is connected and held. The connector 96 is formed with a first flow path 96 a communicating with the first path 82 and a second flow path 96 b communicating with the second path 83. The front end portion 94b of the first pipe 94 is opened as the injection port Na of the sealing material S. The distal end portion 95b of the second pipe 95 is opened as a compressed air injection port Nb. The second pipe 95 is curved in an L shape so that the injection port Nb of the tip portion 95b faces the tip portion 94b side of the first pipe 94.

When assuming a straight axis Av passing through the tip 94b that is the injection port Na of the first pipe 94, and assuming a straight axis Aw passing through the tip 95b that is the injection port Nb of the second pipe 95 In addition, both axes Av and Aw intersect each other. That is, the direction of the injection port Na of the first pipe 94 intersects the direction of the injection port Nb of the second pipe 95. Note that the direction of the injection port Na of the first pipe 94 means the injection direction of the sealing material S injected from the injection port Na of the first pipe 94. The direction of the injection port Nb of the second pipe 95 means the injection direction of the compressed air injected from the injection port Nb of the second pipe 95. In the present embodiment, the direction of the injection port Na of the first pipe 94 and the direction of the injection port Nb of the second pipe 95 are substantially orthogonal. However, the crossing of the direction of the injection port Na of the first pipe 94 and the direction of the injection port Nb of the second pipe 95 is not limited to a mode in which they are orthogonal to each other, and the injection is performed from each of the injection ports Na and Nb. Widely includes a mode in which the sealing material S and the compressed air interfere with each other.

Next, a repair method for the closure 1 performed using the repair device 8 according to the second embodiment or the repair device 9 according to the third embodiment will be described (see FIGS. 9, 10, and 11). ). This repair method is the same as the above-mentioned first repair method or second repair method. Specifically, instead of the

pipes

77 and 78 of the

nozzle units

72A, 72B and 72C according to the first embodiment, the

first pipes

84 and 94 and the

second pipes

85 and 95 are placed in the valve stem 61 or It is inserted into a hole 2 c provided separately from the valve stem 61. Next, the compressed air is sprayed from the

second pipes

85 and 95 and the sealing material S is sprayed from the

first pipes

84 and 94 to spray the sealing material S in a desired direction. The spraying direction of the sealing material S is directed to the leakage portion L. The leaking part L occurs, for example, on the inner surface 1a of the end plate part, and the sealing part La is formed in the region including the leaking part L by spraying the sealing material S. The first pipe 94 and the second pipe 95 are pulled out from the hole 2 c provided separately from the valve stem 61 or the valve stem 61 after forming the sealing portion La. Thereafter, the valve stem 61 or the hole 2c provided separately from the valve stem 61 is closed.

Next, the repair device 10 according to the fourth embodiment will be described with reference to FIG. The repair device 10 according to the fourth embodiment includes the same structure and functional elements as the repair device 8 according to the second embodiment. Therefore, in the following description, it demonstrates centering around difference, the same code | symbol is attached | subjected to the same structure etc. and detailed description is abbreviate | omitted.

The sealing material S according to the present embodiment is generated by mixing and stirring the main agent Sa and the curing agent Sb (including the initiator). For example, as the sealing material S, a two-component epoxy adhesive, a two-component acrylic adhesive, a two-component urethane adhesive, or the like can be used.

The repair device 10 includes a nozzle unit 81, a first path 11 connected to the nozzle unit 81 and through which the sealing material S passes, a second path 83 connected to the nozzle unit 81 and through which compressed air passes, A first tank 13 for storing the main agent Sa and a second tank 14 for retaining the curing agent Sb are provided.

The first path 11 includes a first introduction pipe line 11c connected to the first tank 13, a second introduction pipe line 11b connected to the second tank 14, and a first introduction pipe line 11c. And the second introduction pipe line 11 b are provided with a static mixer 12, and a merge pipe line 11 a connected to the static mixer 12 and the connector 86 of the nozzle unit 81. A first pump 15 for pumping the main agent Sa is disposed on the first introduction pipe line 11c, and a second pump for feeding the curing agent Sb on the second introduction pipe line 11b. The pump 16 is arranged. The static mixer 12 is an example of a mixer that mixes and stirs the main agent Sa and the curing agent Sb.

Note that, as with the repair device 10 according to the second embodiment, a negative pressure is generated by the compressed air injected from the second pipe 85. When the viscosity is so low that the main agent Sa and the curing agent Sb can be transferred due to the negative pressure, at least one of the first pump 15 and the second pump 16 can be omitted. Moreover, about the nozzle unit, it can replace with the nozzle unit 81 which concerns on 2nd Embodiment, and can also use the nozzle unit 91 which concerns on 3rd Embodiment.

Next, a repair method for the closure 1 performed using the repair device 10 according to the fourth embodiment will be described. This repair method is basically the same as the above-described third repair method. More specifically, the first pipe 84 and the second pipe 85 are inserted into the hole 2 c provided in the valve stem 61 or separately from the valve stem 61. Next, the compressed air is injected from the second pipe 85 and the sealing material S is sprayed from the first pipe 84 to spray the sealing material S in a desired direction. Here, for example, the first pump 15 and the second pump 16 are driven to introduce the main agent Sa and the curing agent Sb into the static mixer 12. The main agent Sa and the curing agent Sb are mixed and stirred in the static mixer 12 to become the sealing material S. The sealing material S passes through the first path 11, is supplied to the nozzle unit 81, and is injected from the injection port Na of the first pipe 84. The spraying direction of the sealing material S is directed to the leakage portion L. By spraying the sealing material S, a sealing portion La is formed in a region including the leakage portion L. The first pipe 84 and the second pipe 85 are pulled out from the hole 2 c provided separately from the valve stem 61 or the valve stem 61 after forming the sealing portion La. Thereafter, the valve stem 61 or the hole 2c provided separately from the valve stem 61 is closed.

The operation and effect of the above-described repair method of the closure 1 and the

repair devices

7, 8, 9, 10 will be described. In order to prevent moisture from entering from the outside, a constant internal pressure is usually applied in the closure 1. In the above repair method, the sealing portion La is formed not on the outer surface of the closure 1 but on the

inner surfaces

1a and 1b. Since the internal pressure in the closure 1 acts to press the sealing portion La against the

inner surfaces

1 a and 1 b of the closure 1, the sealing portion La is difficult to peel off from the

inner surfaces

1 a and 1 b of the closure 1. As a result, an additional structure for holding the sealing portion La becomes unnecessary, and in particular, the apparatus and work to be installed outside the closure 1 are simplified, which is advantageous for work in a space-saving manner.

Further, in the above repair method, after the gas leakage portion L is generated, the sealing portion La is formed to block the gas leakage portion L. As a result, gas leakage can be stopped in an efficient and stable manner by directly closing the leakage portion L with the sealing portion La. In addition, before the gas leakage part is generated, the above-described repair method may be performed to form the sealing part La to prevent the gas leakage from the inside of the closure 1. As a result, it is effective in preventing gas leakage.

In the above repair method, the sealing material S is sprayed toward the end face plate 4 in the sleeve 2 to form the sealing portion La on the inner surface 1 a of the end face plate 4. The end face plate 4 is formed with a through hole 4a through which the cable C is inserted. The through-hole 4a is closed after the cable C is passed when the closure 1 is assembled, but gas leakage is likely to occur as compared with other portions in the closure 1. Therefore, the leakage of gas can be effectively repaired by forming the sealing portion La on the inner surface 1a of the end face plate 4.

The place where the sealing portion La is formed is not limited to the inner surface 1a of the end face plate 4, and may be at least one of the end face plate 4 and the

inner faces

1a and 1b of the sleeve 2. Specifically, it may be a place where the gas leakage portion L is formed or a place where it is desired to prevent the gas leakage.

Further, in the first repair method described above, the existing valve stem 61 in which the valve core 62 is housed is used as the hole 2c formed in the sleeve 2. As a result, holes for inserting the

pipes

77, 78, 84, 85, 94, 95 can be easily formed. Further, the valve stem 61 can be easily closed by incorporating the valve core 62 therein.

In the second repair method, the hole 2c for inserting the

pipes

77, 78, 84, 85, 94, 95 is formed in the sleeve 2, and the

pipes

77, 78, 84, 85, 94 are formed in the hole 2c. , 95 are inserted. Thereafter, after forming the sealing portion La, the

pipes

77, 78, 84, 85, 94, and 95 are removed from the hole 2c to close the hole 2c. In the second repair method, the degree of freedom of the place where the hole 2c for inserting the

pipe

77, 78, 84, 85, 94, 95 is increased, and the sealing portion La can be easily formed aiming at a desired place.

In the second repair method, the

pipes

77, 78, 84, 85, 94, 95 are formed on the flat portion 2 b of the sleeve 2. An appropriate hole 2c can be easily formed by forming the hole 2c in the flat portion 2b instead of the curved portion or the uneven portion of the sleeve 2. In addition, when the sleeve 2 does not include the flat portion 2b, or when it is easier to form the hole 2c at a desired place when the hole 2c is provided in addition to the flat portion 2b, the flat portion 2b is not provided. It is also possible to form the hole 2c in the place.

As the sealing material for the repair method described above, an adhesive that adheres to at least one of the inner surfaces of the closure 1 and cures to form the sealing portion La can be used. By forming the sealing portion with an adhesive that adheres to the inner surface of the closure 1 and cures, the sealing portion La can be easily formed over a wide range.

As the sealing material for the repair method described above, powder that fills the gas leakage portion and forms the sealing portion can be used. When the powder is sprayed toward the gas leakage portion, the powder is sucked into the leakage portion L and buried in the gas leakage portion L, so that the sealing portion La can be easily formed.

The sealing material S used in the above repair method may be formed by mixing the main agent Sa and the curing agent Sb.

Also, the repair method described above can be implemented as appropriate using the

repair devices

7, 8, 9, and 10 according to the above embodiments.

In the repair device 7 according to the first embodiment, since the injection port Na of the sealing material S is formed in the side portion 77c of the pipe 77, the sealing material S intersects the axis Ax of the pipe 77. It is injected toward the direction to do. Therefore, for example, it becomes easy to inject the sealing material S aiming at the side which is a direction intersecting the axis Ax direction of the pipe 77.

Further, in the

repair devices

8, 9, and 10 according to the second to fourth embodiments, the sealing material S injected from the injection port Na of the

first pipes

84 and 94 in the closure 1 is the second pipe. The compressed air injected from the injection ports Nb of 85 and 95 spreads in the form of a mist and forms a sealing portion La on at least a part of the

inner surfaces

1a and 1b of the closure 1.

Hereinafter, the results of verifying the effect using the examples will be described. Note that the following examples are used for the purpose of verifying the effects, and the present invention is not limited to these examples.

Example 1
A transparent acrylic pipe having an inner diameter of 77 mm was prepared in place of the actual closure. A 0.7 mm hole was formed on the side of the acrylic pipe as a gas leakage part. A 3M (TM) spray paste 111 manufactured by 3M Co. was used as the sealing material, and a spray can type repair device for injecting the sealing material was used. The 3M (TM) spray paste 111 contains chloroprene rubber and has high adhesiveness, heat resistance and fatigue resistance, and is suitable for forming a thin film (sealing portion).

Using the repair device, the sealing material was sprayed toward the inner surface of the acrylic pipe. The sealing part was formed in the inner surface including the leaking part by injection of the sealing material. As a result, the leaking portion was filled with the sealing material, and gas leakage was prevented.

(Example 2)
A transparent acrylic pipe having an inner diameter of 77 mm was prepared in place of the actual closure. A 0.5 mm hole was formed on the side of the acrylic pipe as a gas leakage part. Three types of silica gels having different particle size distributions were mixed and used as the sealing material. The diameter of the first silica gel was 0.84 to 0.37 mm, the diameter of the second silica gel was 0.55 to 0.18 mm, and the diameter of the third silica gel was less than 0.18 mm.

Using a spray can type repair device, the sealing material was sprayed toward the inner surface of the acrylic pipe. The sealing part was formed in the leakage part by injection of the sealing material. As a result, the leaking portion was filled with the sealing material, and gas leakage was prevented.

DESCRIPTION OF SYMBOLS 1 ... Closure, 1a, 1b ... Inner surface, 2 ... Sleeve, 2b ... Flat part, 2c ... Hole, 4 ... End face plate, 11c ... 1st introduction pipe line, 11b ... 2nd introduction pipe line, 11a ... Merge pipe Road, 12 ... Static mixer, 13 ... First tank, 14 ... Second tank, 61 ... Valve stem (hole), 62 ... Valve core, 71 ... Spray can, 72A, 72B, 72C, 81, 91 ... Nozzle unit , 74 ... Tube, 75 ... Backflow prevention valve, 76 ... Actuator, 77, 78 ... Pipe, 77a, 78a ... Base end (one end), 77b, 78b ... Tip (the other end), 77c ... Side part, 78f ... 1st bending part, 78g ... 2nd bending part, 82, 11 ... 1st path | route, 83 ... 2nd path | route, 84, 94 ... 1st pipe, 85, 95 ... 2nd Pipe, 84a, 94a ... proximal end (one side End), 84b, 94b ... tip end (the other end), 87 ... tank, 89 ... compressor, Ax ... axis passing through the base end, Ay ... axis passing through the tip end, C ... cable, Na ... injection port (Sealing material), Nb ... injection port (compressed air), S ... sealing material, L ... sealing part, La ... sealing part, Sa ... main agent, Sb ... curing agent.

Claims

A method of repairing a closure comprising a cylindrical sleeve that accommodates a cable and end face plates installed at both ends of the sleeve,
Insert a pipe having an injection port into the hole provided in the sleeve,
Forming a sealing portion on at least a part of the inner surface of the closure by injecting at least one of liquid and powdery sealing material from the injection port,
After forming the sealing portion, pull out the pipe from the hole,
A method of repairing a closure, wherein the hole is closed after the pipe is pulled out.
The method of repairing a closure according to claim 1, wherein after the gas leakage portion is formed, the sealing portion is formed to block the gas leakage portion.
2. The closure repair method according to claim 1, wherein the sealing portion is formed to prevent the leakage of gas from the inside of the closure before the gas leakage portion is generated.
The closure repair method according to any one of claims 1 to 3, wherein a sealing portion is formed on an inner surface of the end face plate by spraying the sealing material toward the end face plate in the sleeve.
The hole is a valve stem that houses a valve core;
Unplug the valve core from the valve stem and open it,
Inserting the pipe into the opened valve stem;
After forming the sealing portion, pull out the pipe from the valve stem,
The closure repair method according to any one of claims 1 to 3, wherein the valve core is closed on the valve stem after the pipe is pulled out.
Forming the hole in the sleeve, inserting the pipe into the hole,
After forming the sealing portion, pull out the pipe from the hole,
The closure repair method according to any one of claims 1 to 3, wherein the hole is closed after the pipe is pulled out.
The method of repairing a closure according to claim 6, wherein the sleeve includes a flat portion, and the hole is formed in the flat portion.
4. The closure repair method according to claim 1, wherein the sealing material is an adhesive that adheres to at least one of the inner surfaces of the closure and cures to form a sealing portion.
The closure repair method according to any one of claims 1 to 3, wherein the sealing material is a powder that fills a gas leakage portion to form a sealing portion.
4. The closure repair method according to claim 1, wherein the sealing material is formed by mixing a main agent and a curing agent.
A repair device used for repairing a closure,
A spray can storing at least one sealing material in a liquid state and a powder state in a pressurized state;
A nozzle unit for injecting the sealing material,
The spray can is a tube through which the sealing material passes,
A backflow prevention valve that is connected to the tube and opens when the pressure is received, and closes the flow path when the pressure is released,
The nozzle unit includes an actuator attached to the check valve;
A repair device in which an injection port through which the sealing material is injected is formed in the pipe.
The repair device according to claim 11, wherein the pipe includes one end connected to the actuator, the other closed end, and the injection port formed on a side.
The pipe has one end connected to the actuator, the other end opened as the injection port, and a curved portion curved between the one end and the other end. The repair device according to claim 11, wherein an axis passing through the other end intersects an axis passing through the one end.
A repair device used for repairing a closure,
A nozzle unit that injects compressed air and at least one of a liquid and a powdery sealing material; and
A first path connected to the nozzle unit and through which the sealing material passes;
A second path connected to the nozzle unit and through which the compressed air passes,
The nozzle unit includes a first pipe connected to the first path, and a second pipe connected to the second path,
The first pipe includes an injection port for injecting the sealing material,
The second pipe includes an injection port for injecting the compressed air,
The repair device, wherein the direction of the injection port of the first pipe intersects the direction of the injection port of the second pipe.
A tank in which the sealing material is stored; and a compressor for supplying compressed air to the second pipe;
The repair device according to claim 14, wherein the first path is connected to the first pipe and the tank, and the second path is connected to the second pipe and the tank.
Of the main agent and the hardener that are mixed together and serve as the sealing material, the first tank in which the main agent is stored, the second tank in which the hardener is stored, and the first tank are disposed on the first path. And a mixer for mixing the main agent and the curing agent,
The first path is connected to the mixer and the first tank so that the main agent passes through, the first path is connected to the mixer and the second tank, and the curing agent is The repair apparatus according to claim 14, further comprising: a second introduction pipe that passes through; and a merge pipe that is connected to the mixer and the first pipe and through which the sealing material passes.