JP6876841B1 - Cable removal method and closure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more easily remove an upstream cable connected to a closure to which a tap cable is connected. SOLUTION: When removing a cable C1 on a gas supply side connected to a closure 5A among closures 5A and 5B connected to each other by a tap cable C5 that connects a core wire but shuts off gas, the closure 5A is used. The cable C1 was disassembled and removed from the closure 5A, the end face plate 53 holding the cable C1 was replaced with a new end face plate 13, and the closure 1 was replaced with a sleeve body 12 having a two-branch valve 14 as a gas valve. Assembled, one port 14A of the two-branch valve 14 and the gas valve 54 of the closure 5B are connected by a gas pipe 3. [Selection diagram] Fig. 2

Description

The present invention relates to a method for removing a cable and a closure.

The metal cable is arranged in the underground equipment from the equipment building, is pulled up to the ground, and is wired to each household via a utility pole. In the maintenance of metal cables installed in underground equipment, gas (dry air) is supplied from the equipment building (station building) into the metal cables, and pressure is transmitted in the closure installed at the connection point of the metal cables. The machine monitors the pressure of the gas in the closure. There are closures with a pressure transmitter attached and closures without a pressure transmitter.

When a gas leak is detected, go to the site where the gas may be leaking, attach a pressure measuring device to the gas valve of the closure, and measure the pressure of the gas inside the closure to identify the leak point. .. The pressure measuring instrument is a portable type that is portable in size, and uses, for example, a digital manometer. The pressure measuring instrument is also used when assembling the closure to confirm that there is no gas leak due to improper assembly.

On the other hand, in the closures installed in close proximity, the core wire was sometimes branched from another closure in response to the shortage of the core wire due to the increase in demand downstream of one closure. In this case, since gas is supplied to each closure separately from the upstream cable, the closures are connected to each other using a tap cable that connects the core wires but shuts off the gas so that the gas does not mix. To do.

Japanese Patent No. 6572359

In recent years, the demand for metal cables has decreased due to the spread of optical communication. Therefore, metal cables on the same route are being removed after being replaced.

When the upstream cable to which gas is supplied from one of the closures connected to each other by using the tap cable is removed, the gas is not supplied to the closure from which the upstream cable is removed. In the past, in order to secure a gas supply route, the tap cable that shuts off the gas was removed, and instead a tap cable that did not shut off the gas was newly installed. It was supplying gas.

The conventional method of removing the upstream cable and then replacing the tap cable is to disassemble each of the two closures connected by the tap cable, connect the core wire of the tap cable in each of the two closures, and then add two more. The closure needs to be reassembled. Therefore, there have been problems such as high construction cost, temporary line disconnection due to switching connection, and long construction period.

The method of Patent Document 1 is a method of supplying gas by connecting a gas pipe to one of the gas valves by using a closure provided with two gas valves without replacing the tap cable after removing the upstream cable. Since two gas valves are provided, even if a gas pipe is connected to one gas valve, a pressure measuring device can be attached to the other gas valve. In the method of Patent Document 1, only the closure from which the cable is removed needs to be disassembled and assembled using the closure provided with two gas valves, so that the work efficiency can be improved.

However, the method of Patent Document 1 requires preparing a new closure provided with two gas valves, and there is room for improvement.

The present invention has been made in view of the above, and an object of the present invention is to more easily remove the upstream cable connected to the closure to which the tap cable is connected.

One aspect of the cable removal method of the present invention is the gas supply side connected to the first closure of the first closure and the second closure, which are connected to each other by a tap cable that connects the core wires but shuts off the gas. The cable removal method, the step of disassembling the first closure, the step of removing the cable from the first closure, and the step of replacing the end face plate holding the cable with a new end face plate. The step of assembling the first closure, the step of attaching the two-branch valve to the gas valve of either the first closure or the second closure, the one mouth of the two-branch valve and the first closure or the second closure. It is characterized by having a step of connecting to the gas valve of the above with a gas pipe.

The closure of one aspect of the present invention is a closure to which a tap cable for connecting a core wire but shutting off gas is connected, and is attached to a sleeve body having a two-branch valve on the gas valve and both ends of the sleeve body. The end face plate is provided, and one port of the two-branch valve and a gas valve provided by another closure connected to each other by the tap cable are connected by a gas pipe.

According to the present invention, the upstream cable connected to the closure to which the tap cable is connected can be removed more easily.

It is a figure which shows the state of the closure connected to each other by using the tap cable which shuts off a gas. It is a figure which shows the state which connected the cable using the closure of this embodiment. It is a flowchart explaining the procedure of attaching a closure of this embodiment. It is a figure which shows another state which connected the cable using the closure of this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

With reference to FIG. 1, an underground closure that connects core wires and is interconnected by using a tap cable that shuts off gas will be described. The left side of FIG. 1 is the upstream side (equipment building side and gas supply side), and the right side is the downstream side (user's house side).

In FIG. 1, closures 5A and 5B are connected to each other using a tap cable C5. A gas dam 7 is attached to the tap cable C5 to shut off the gas.

In the closure 5A, the core wire of the cable C1 and the core wire of the cable C2 are connected, and the core wire of the tap cable 5C branched from the closure 5B and the core wire of the cable C2 are also connected. Gas is supplied to the closure 5A through the cable C1. The gas supplied to the closure 5A is also supplied to the closure in the subsequent stage through the cable C2.

In the closure 5B, the core wire of the cable C3 and the core wire of the cable C4 are connected, and a part of the core wire of the cable C3 is branched into the tap cable C5. Gas is supplied to the closure 5B through the cable C3. The gas supplied to the closure 5B is also supplied to the closure in the subsequent stage through the cable C4.

Since the gas dam 7 is attached to the tap cable C5 connecting the closures 5A and 5B, the gas supplied to the closure 5A by the cable C1 and the gas supplied to the closure 5B by the cable C3 are not mixed. A part of the core wire of C3 can be connected to the core wire of the cable C2 via the tap cable C5.

The closures 5A and 5B are provided with a gas valve 54, and a pressure measuring device can be attached to the gas valve 54 to measure the pressure of the gas in each closure 5A and 5B.

The closure 1 of the present embodiment will be described with reference to FIG. The upper closure 1 in FIG. 2 is the closure of the present embodiment after the cable C1 is removed, and the lower closure 5B is the same as the closure 5B in FIG. The left side of the figure is upstream and the right side is downstream.

If the cable C1 is removed in the state of FIG. 1, gas will not be supplied to the closure 5A. Therefore, the gas valve of the closure 1 of the present embodiment shown in FIG. 2 is provided with a two-branch valve 14, and a gas pipe 3 is connected to one port 14A of the two-branch valve 14 to supply gas into the closure 1 and the two-branch valve. The other mouth 14B of 14 is closed with a cap. When measuring the pressure of the gas in the closure 1, the cap is removed and a pressure measuring device is attached to the port 14B of the two-branch valve. As a result, even if the cable C1 that has supplied the gas is removed, the gas is supplied from the gas pipe 3 via the two-branch valve 14 and the gas valve, and the pressure measuring device is connected to the other port 14B of the two-branch valve 14. It can be attached and the pressure of the gas in the closure 1 can be measured.

In closure 1, the core wire of the tap cable C5 branched from the closure 5B and the core wire of the cable C2 are connected. Closure 1 and closure 5B are connected by a gas pipe 3. The gas pipe 3 is attached to one port 14A of the two-branch valve 14 of the closure 1 and a gas valve 54 arranged in the sleeve body 52 of the closure 5B. The gas supplied from the cable C3 to the closure 5B is supplied to the closure 1 via the gas pipe 3. The gas supplied to the closure 1 is also supplied to the closure in the subsequent stage through the cable C2.

Subsequently, the configuration of the closure 1 will be described.

The closure 1 has a cylindrical shape for accommodating the connection portion of the cable C2 and the tap cable C5 inside, and has a semi-cylindrical sleeve bodies 11 and 12, end face plates 13 provided at both ends of the closure 1 in the axial direction, and a closure. A plurality of stainless steel bands 15 for pressing and fixing 1 from the side surface direction are provided.

The semi-cylindrical sleeve bodies 11 and 12 are combined to form the side surface of the closure 1. A sleeve gasket (not shown) is arranged at the joint of the sleeve bodies 11 and 12.

The sleeve body 12 includes a gas valve to which a bifurcated valve 14 is attached. The gas valve is a vent leading to the space inside the closure 1. The gas pipe 3 is connected to one port 14A of the two-branch valve 14. A pressure measuring device can be attached to the other port 14B of the two-branch valve 14 when checking for gas leakage during closure assembly. Normally, the other port 14B of the bifurcated valve 14 is in the closed state. The gas pipe 3 may be connected to any of the ports 14A and 14B of the two-branch valve 14.

The ports 14A and 14B of the two-branch valve 14 are preferably compatible with the joint of the gas pipe 3. When the sizes of the ports 14A and 14B of the two-branch valve 14 and the size of the joint of the gas pipe 3 are different, it is advisable to attach an attachment for converting the size of the joint to the gas pipe 3.

Each of the end face plates 13 at both ends of the closure 1 is provided with through holes for passing the cable C2 and the tap cable C5. When the cable C2 and the tap cable C5 are passed through the end face plate 13, an airtight tape that closes the gap between the cable C2 and the tap cable C5 is wrapped around the cable C2 and the tap cable C5. The end face plate 13 is formed by joining semicircular members that divide the through holes with bolts or the like. An end face plate gasket (not shown) is arranged at the joint between the end face plate 13 and the sleeve bodies 11 and 12, that is, at the outer peripheral portion of the end face plate 13. Since the end face plate 13 is a separate component from the sleeve bodies 11 and 12, it is possible to arbitrarily select and use an end face plate 13 according to the number and size of cables to be passed through.

The stainless band 15 is wrapped around the outer circumferences of the sleeve bodies 11 and 12 and tightened with screws (not shown). The stainless band 15 presses and fixes the outer circumferences of the sleeve bodies 11 and 12.

Similar to the closure 1 of the present embodiment, the conventional closure 5B also includes sleeve bodies 51 and 52, an end face plate 53, and a stainless band 55. The sleeve body 52 includes a gas valve 54.

When the gas pipe 3 is connected to the gas valve 54, a pressure measuring device for measuring the gas pressure in the closure 5B cannot be attached, but since the closures 1 and 5B are connected by the gas pipe 3, the closures 1 and 5B are inside the closures 1 and 5B. The gas pressure is about the same. By attaching a pressure measuring device to the closure 1, the gas pressure in the closure 1 and the closure 5B can be measured. Alternatively, a two-branch valve may be attached to the closure 5B, a gas pipe 3 may be connected to one port of the two-branch valve, and a pressure measuring device may be attached to the other port to measure the gas pressure in the closure 5B. Thereby, the gas pressure in the closure 5B can be measured without disassembling the closure 5B.

Next, a procedure of removing the cable C1 of FIG. 1 and attaching the closure 1 of the present embodiment will be described.

FIG. 3 is a flowchart illustrating a procedure for attaching the closure 1 of the present embodiment.

First, the closure 5A of FIG. 1 that grips the cable C1 to be removed is disassembled, and the cable C1 is removed (step S1).

When disassembling the closure 5A, the end face plate 53 through which the cable C2 has passed can be used as it is, so that the cable C2 does not have to be removed from the end face plate 53 on the downstream side. The sleeve body 51 on the lower side of the closure 5A may be used as it is. Therefore, when disassembling the closure 5A, the stainless band 55 may be removed, the upper sleeve body 52 may be removed, and the upstream end face plate 53 through which the cable C1 has passed may be disassembled.

After disassembling the closure 5A, the core wires of the cable C1 and the cable C2 are disconnected, and the cable C1 is removed. The core wires of the tap cable C5 and the cable C2 are left connected.

Subsequently, the closure 1 is assembled (step S2). As the upper sleeve body 12 of the closure 1, the sleeve body 52 of the disassembled closure 5A may be used as it is. Hereinafter, the assembly of the closure 1 will be described.

Wrap the airtight tape around the part where the end face plate 13 of the tap cable C5 is attached. The end face plate 13 is replaced with a new one (one with one through hole). The semicircular member of the end face plate 13 is joined so that the tap cable C5 passes through the through hole, and the end face plate 13 is attached to the tap cable C5. An end face plate gasket is attached to the outer circumference of the end face plate 13.

Apply the lower sleeve body 11 (the sleeve body 51 of the closure 5A may be used as it is) to the end face plate 13, attach the sleeve gasket to the joint of the sleeve bodies 11 and 12, and cover the sleeve body 12 with the sleeve body 11. ..

Wrap the stainless band 15 around the outer circumferences of the sleeve bodies 11 and 12, and tighten the screws of the stainless band 15.

Closure 1 can be assembled by the above steps. After assembling the closure 1, gas is sealed in the closure 1, and then a soap solution is used to check for leaks.

Subsequently, the two-branch valve 14 is attached to the gas valve provided in the sleeve body 12 (step S3). The two-branch valve 14 may be attached to the gas valve before assembling the closure 1 in step S2. The two-branch valve 14 may be attached to the gas valve 54 of the closure 5B instead of the closure 1. In this case, the gas pipe 3 is connected to one port 14A of the two-branch valve 14 attached to the gas valve of the closure 1 and the gas valve 54 of the closure 5B.

In steps S2 and S3, the closure 1 may be assembled using a sleeve body 12 with a gas valve having a bifurcated valve 14.

After assembling the closure 1, the closure 1 and the closure 5B are connected by a gas pipe 3 (step S4). Specifically, one end of the gas pipe 3 of the closure 1 is connected to one port 14A of the two-branch valve 14, and the other end of the gas pipe 3 is connected to the gas valve 54 of the closure 5B.

After connecting the gas pipe 3, the gas supplied through the cable C3 is also supplied to the closure 1 through the gas pipe 3, and is also supplied to the closure at the subsequent stage of the closure 1 through the cable C2. After a certain period of time, the gas pressure stabilizes.

As described above, when the cable C1 is removed, by using the closure 1 of the present embodiment, only the closure 5A that grips the cable C1 is disassembled and assembled, and the other closure 5B does not need to be disassembled and assembled. Since the tap cable C5 is used as it is and no new tap cable that does not shut off gas is not installed, it is not necessary to switch and connect the core wires. Further, a new closure provided with two gas valves used in the technique of Patent Document 1 is unnecessary.

Next, another state in which the cable is connected using the closure 1 of the present embodiment will be described.

FIG. 4 is a diagram showing an example in which the tap cable C5 is passed through the same end face plate 53 as the remaining cable C2.

In FIG. 1, the tap cable C5 passes through the same end face plate 53 as the cable C1 to be removed, but the tap cable C5 may pass through the same end face plate 53 as the downstream cable C2. In this case, when the closure 1 of the present embodiment is attached, neither the cable C2 nor the tap cable C5 is removed, so the end face plate 53 through which the cable C2 and the tap cable C5 are passed is used as it is. Since the cable is not passed from the side from which the cable C1 is removed, an end face plate 13 having no through hole for passing the cable is attached. The only difference from FIG. 2 is the end face plate 13 to be attached.

In the present embodiment, since the tap cable C5 connecting the closures 5A and 5B is used as it is, it can be applied regardless of the place where the tap cable C5 is passed.

As described above, according to the present embodiment, the gas supply side connected to the closure 5A of the closures 5A and 5B connected to each other by the tap cable C5 that connects the core wires but shuts off the gas. When removing the cable C1, the closure 5A is disassembled, the cable C1 is removed from the closure 5A, the end face plate 53 holding the cable C1 is replaced with a new end face plate 13, and the gas valve is provided with a two-branch valve 14. By assembling the closure 1 using the sleeve body 12 and connecting one port 14A of the bifurcated valve 14 and the gas valve 54 of the closure 5B with a gas pipe 3, the tap cable C5 that shuts off gas can be used as it is. Therefore, the disassembly and assembly of the closure 5B and the process of switching and connecting the core wires are not required, the construction period can be shortened, and the construction efficiency can be expected to be improved. Since the remaining closure 5B is not disassembled, the user downstream of the closure 5B does not have a communication interruption or a gas supply interruption.

Further, since the only new minimum necessary members are the replacement end face plate 13, the two-branch valve 14, and the gas pipe 3 for replacing the end face plate 53 that gripped the cable C1, cost reduction effect can be expected.

1 ... Closure 11, 12 ... Sleeve body 13 ... End face plate 14 ... 2 branch valve 14A, 14B ... 2 branch valve mouth 15 ... Stainless band 3 ... Gas pipe 5A, 5B ... Closure 51, 52 ... Sleeve body 53 ... End face plate 54 … Gas valve 55… Stainless band 7… Gas dam

Claims (3)

It is a method of removing the cable on the gas supply side connected to the first closure of the first closure and the second closure, which are connected to each other by a tap cable that connects the core wires but shuts off the gas.
The process of disassembling the first closure and
The step of disconnecting the cable from the first closure and
The process of assembling the first closure by replacing the end face plate holding the cable with a new end face plate, and
The process of attaching a two-branch valve to the gas valve of either the first closure or the second closure, and
A method for removing a cable, which comprises a step of connecting one port of the two-branch valve and the gas valve of the first closure or the second closure with a gas pipe. The cable according to claim 1, wherein in the step of assembling the first closure and the step of attaching the two-branch valve, the first closure is assembled by using a sleeve body provided with the two-branch valve as a gas valve. How to remove. It is a closure to which a tap cable that connects the core wire but shuts off the gas is connected.
A sleeve body with a two-branch valve on the gas valve and
With end face plates attached to both ends of the sleeve body,
A closure characterized in that one port of the two-branch valve and a gas valve provided by another closure connected to each other by the tap cable are connected by a gas pipe.

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