JPH048112A - Method of treatment of cut terminal of oil-filled cable - Google Patents

Abstract

PURPOSE:To avoid an oil leakage easily by a method wherein, after an OF cable having an oil path in it is cut, a part of oil in the cable is drained off and solidifying-type sealing material is injected into the oil path and solidified to seal the oil path. CONSTITUTION:An OF cable 1 is cut at a predetermined position and a predetermined length of the tip of an injection hose 33 is inserted into the oil path 2 of the OF cable 1. Then a switching valve 31 is operated to link a linkage hose 32 with the injection hose 33. An oil-drain machine 11 is driven to drain a predetermined quantity of oil off the OF cable 1. After that, the switching valve 31 is operated to link the outlet 25 of an injection chamber 27 and compressed gas 8 in a gas bomb 29 is introduced into the injection chamber 27. With this process, solidifying-type sealing material 30 in the injection chamber 27 is injected into the oil path 2 and the oil path 2 is filled with the sealing material 30 which is solidified with a lapse of time to seal the cut end side of the oil path 2. With this constitution, an oil leakage from the OF cable 1 can be avoided regardless of the underwater installation or the underground installation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a terminal treatment method for preventing oil from leaking from the terminal of a cut 0F (Oil Filled) cable.

rPrior art 1 As is well known, an OF cable contains insulating oil to absorb the expansion and contraction of the cable, and this insulating oil is used to connect the oil passage inside the cable and the hydraulic pressure installed outside. Expansion and contraction of the cable is absorbed by moving it in and out of the adjustment tank.

OF cables can be installed on the underwater base (seafloor, riverbed) as necessary.
However, civil engineering construction work after the cable is laid, such as seawalls, etc.
BACKGROUND OF THE INVENTION In various types of construction work such as road construction and bridge construction, when the construction area overlaps with a cable installation line, there are cases where the OF cable must be cut.

In such cases, it is customary to remove all OF cables within the construction area, but this requires a great deal of effort, expense, and
It takes time.

As a technique that can be applied as a countermeasure, Japanese Patent Application Laid-Open No. 521434
The method for cutting rOF submarine cables disclosed in Publication No. 93 can be found here.

In the above-mentioned known technology, when cutting an OF submarine cable underwater, the oil passage in the cable is crushed before the cable is cut to prevent the oil in the cable from leaking outside, and then the cutting machine is operated. Cut the cut section of the cable by remote control.

In this way, when the OF submarine cable is cut, no oil leaks from inside the cape because the oil passage is crushed before cutting.

Therefore, even if the OF submarine cable is left as it is after being cut, that is, even if the cut OF cable is not removed, various types of pollution caused by oil leaks, such as seawater,
There will be no pollution of river water or groundwater.

Problems to be Solved by the Invention J In the case of the above-mentioned known technology, it seems effective in preventing oil leakage from cut cables, but when considering the remote control of a cutting machine equipped with a crushing function, For example, this cannot be applied at the bottom of water at a depth of 10 meters or more, or directly under a structure such as a building, and even as a cutting machine, it has to have a special structure to crush the oil passage, making it difficult to handle. It is.

In order to solve this technical problem, the present invention aims to provide a method for treating the cutting end of an OF cable, which can be easily applied whether underwater or underground, and which can reliably prevent leakage. It is.

1 Means for Solving the Problem 1 In order to achieve the intended purpose, the method for treating the cut end of an OF cable according to the present invention, after cutting an OF cable having an oil passage inside, cuts the cut end of the OF cable. In, O
Part of the oil in the F cable is drained from the oil passage, and then a coagulable sealing material is injected into the oil passage, and the sealing material is solidified to seal the oil passage. It is characterized by

1 Effect” In the case of the OF cable cutting terminal processing method according to the present invention,
Broadly speaking, the process includes a cable cutting process, a process of draining oil from the cable, and a process of injecting a coagulable sealant into the oil passage and coagulating it.

The cable cutting process is performed to cut off the portion of the OF cable that falls within the area of concern.

The oil removal step is performed to remove at least an amount of oil from the oil passageway that is in balance with the amount of coagulable sealant to be injected into the oil passageway.

If this oil is not drained, the coagulable sealant injected into the oil passage will increase the internal pressure of the oil passage, causing the coagulable sealant to flow backwards, or the coagulable sealant to be inserted into the oil passage (e.g. :hose)
has separated from the oil passage.

The process of injecting the coagulable sealant into the oil passage and solidifying it is as follows:
As is obvious, this is done to seal the oil passage.

Thus, when the cut end of the OF cable is sealed, oil in the OF cable can be prevented from leaking from the oil passage of the cut end of the cable.

“Example” An example of the OF cable cutting terminal processing method according to the present invention will be described with reference to the drawings.

In FIG. 1, 1 indicates an OF cable, 11 indicates an oil removal machine, and 21 indicates a coagulable sealant injection machine.

As is well known, OF cables mainly consist of one or more cable cores (e.g. spiral + conductor + insulator), which are coated with metal sheathing such as lead sheathing, AI sheathing, etc.
It is equipped with reinforcing layers such as armor and anti-corrosion layers.

The OF cable 1 has an oil passage 2 inside it, such as in the center and in the intervening part.

The oil removal machine 11 consists of a vacuum pump 14 having a suction part 12 and a discharge part 13, and a power source 13 for the vacuum pump 14.
6 is placed.

The injection machine 21 includes an injection container 27 having an inlet portion 23 with a valve 22, an outlet portion 25 with a valve 24, a pressure gauge 26, etc., and a gas pump connected to the inlet portion 23 of the injection container 27 via a pressure-resistant hose 28. 29, and a coagulable sealing material 30 is housed in the injection container 27.

As the coagulable sealing material 30, a natural or synthetic type (cement type, resin type) that solidifies through a chemical reaction can be used, and concrete mortar can be cited as an example thereof.

In the above, a switching valve 31 such as a three-way cock is attached to the outlet portion 25 of the injection machine 21 through one connection port, and a connection hose 32 and an injection hose 33 are connected to the remaining two connection ports of this switching valve 31. are connected to each other.

The connection hose 32 is connected to the suction part 12 of the vacuum pump 14, and the injection hose 33 can be inserted into and removed from the oil passage 2 of the OF cable 1.

Pressure resistant hose 28, connection hose 32. The injection hose 33 and the like are made of materials suitable for these uses.

For example, in the case of the pressure hose 28, materials with excellent mechanical properties (metal, synthetic resin) are mainly used, and in the case of the connection hose 32, materials with excellent oil resistance (metal, synthetic resin) are mainly used. Ru.

Furthermore, in the case of the injection hose 33, it is made of polyvinyl synthetic resin, which is resistant to oil and organic solvents, as well as being flexible and
Materials with excellent mechanical properties, weather resistance, etc. are also used.

In the embodiment shown in FIG. 1, the OF cable 1 is cut and terminated as follows.

First, a predetermined portion of the OF cable 1 is cut using a cable cutter (not shown), and immediately after the cutting, the distal end side of the injection hose 33 is inserted by a predetermined length into the oil passage 2 of the OF cable 1.

Next, the switching valve 31 is operated to cause the connection hose 32 and the injection hose 33 to communicate with each other, and the oil wetting machine 11 is operated in this state.

That is, in the oil-wetting machine 11, when the vacuum pump 14 is driven by the power source 13, the oil in the OF cable 1 flows through the oil passage 2→injection hose 33→switching valve 31→connection hose 32→vacuum pump suction section 12. The oil is sucked into the vacuum pump 14 through a path such as
The oil is discharged from the discharge portion 13 into the oil receiver 16 .

After a predetermined amount of oil has been removed from the inside of the OF cable 1, the switching valve 31 is operated again to cause the outlet portion 25 of the injection container 27 in the injection machine 21 and the injection hose 33 to communicate with each other, Compressed gas in the gas cylinder 29 (e.g.
Oxygen) is introduced into the injection container 27 from the pressure hose 2 through the inlet section 23.

When pressure gas is introduced into the injection container 27 in this way,
The coagulable sealant 30 in the injection container 27 is injected and filled into the oil passage 2 through a path such as injection container outlet 25 → switching valve 31 → injection port 33 → OF cable oil passage 2.

At this time, depending on the amount of sealing material that gradually increases in the oil passage 2,
Gradually pull out the injection hose 33 from inside.

Thus, when a predetermined amount of the coagulable sealant 30 is injected and filled into the oil passage 2 of the OF cable 1 and hardens (solidifies) over time, the cut end side of the oil passage 2 is sealed. Oil leakage from inside the OF cable l is prevented.

In the above-mentioned embodiment, the oil in the OF cable oil passage 2 was forcibly removed by the oil wetting machine 11 in the oil removal process, but the oil that naturally flows out from the oil passage 2 is received by the oil receiver and It is also possible to wait until a certain amount of oil is removed from the oil passage 2.

Alternatively, the gas cylinder 29 can be replaced with a compressor.

"Effects of the Invention" As explained above, the OF cable cutting terminal processing method according to the present invention involves cutting the cable by conventional means, connecting the oil passage to a predetermined machine, and draining oil from the inside of the oil passage. , since it only involves injecting a coagulable sealant into the oil passage.
The required treatment can be carried out in a simple process, whether underwater or underground, and since oil is drained from the oil passage before injecting the coagulable sealant, there is no possibility that the coagulant sealant will backflow. The injection work can be carried out stably without causing problems such as the coagulable sealant injection tool coming off from the oil passage. O
Since the F cable does not require removal, the wasted labor, expense, and time associated with cable removal are eliminated.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically illustrating an embodiment of the OF cable cutting terminal processing method according to the present invention. 1...OF cable 2...Oil passage 11...Oil wetting machine 12...Suction part 13...Discharge part 14... ... Vacuum pump 15 ... Drive source 16 ... Oil receptor 21 ... Injection machine 23 ... Inlet section 25 ... Outlet Part 27...Injection container 2 days...Pressure hose 29...Gas pump 30...Coagulable sealing material 31...Switching valve 32 ...Connection hose 33...Injection hose

Claims (1)

[Claims] After cutting an OF cable having an oil passage inside, a part of the oil in the OF cable is drained from the oil passage at the cut end of the cable, and then a coagulable sealant is placed in the oil passage. A method for treating a cut end of an OF cable, characterized in that the oil passage is sealed by injecting the sealing material and coagulating the sealing material.