JPH10145955A - Method for connecting cable in water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct underwater cutting and connecting work for cables in water by using insulating liquid for covering the connection part of the cables. SOLUTION: When a container 102 filled with insulating liquid 101 whose specific gravity is higher than water is immersed in water to put a connection part 104 of a cable 103 in it, metal comes into no contact with the water, which is the cable material of the connection part 104 covered with the liquid 101 even if the container 102 is surrounded with water or sea water. Where connection work for the cable 103 is conducted in the liquid 101, the connection part 104 is covered with the liquid 101, therefore, no leak occurs. It is thus possible to conduct repairing work with the cable 103 in water or sea water and in some cases, it is possible to eliminate work for laying additional cables 103. Under a condition of high water pressure, by cutting the cable 103 after clamping it in the vicinity of a cutting area previously to increase its inner pressure, the liquid 101 will not invade the inside. It is thus possible to conduct connection, and attachment/detachment of the cable even in water or sea water in the same way as those on the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a signal line and a power line underwater or in seawater, and is characterized in that a cable can be easily connected and disconnected underwater.

2. Description of the Related Art Electric leakage due to water permeation tends to occur at a cable connection. In order to avoid electric leakage, waterproofing treatment has been performed in water or seawater, such as placing the cable connection in a closed container or hardening it with a polymer resin. However, when the cable connection was placed in a container or hardened with resin, it was difficult to lay the cable, which was inconvenient. Also, the cable could not be cut underwater or in seawater, and had to be lifted to the ground and repaired. On the other hand, in the case of equipment used underwater, the cable cannot be connected to the equipment underwater, so the equipment must be transported or installed with the cable attached, which is inconvenient.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for cutting and connecting a cable underwater and a method for connecting and disconnecting a cable underwater using a connector.

Means for Solving the Problems In order to prevent electric leakage at the connection part of the cable, the connection part should be covered with an insulator so that the metal which is the material of the cable or the connector does not come into contact with water. In this invention, an insulating liquid is used to cover the connection. If it is in an insulating liquid, the cable can be connected by crimping or the like, and the cable can be attached and detached using a connector. After connecting the cable, place the cable connection in a container or cover it with an elastic material so that the insulating liquid does not leak.

Operation and Embodiment In the embodiment shown in FIG. 1, a container 102 filled with an insulating liquid 101 having a specific gravity greater than that of water is immersed in water, and a connection portion 104 of a cable 103 is placed therein. . Even if water around 102 is water or seawater, 1
The metal that is the material of the cable of the connection portion 104 covered with 01 does not leak because it does not come into contact with water. Also, 10
If the tip of 3 is a connector, it can be easily attached and detached. 10
If 1 is heavier than water, 102
If it is not tilted, 101 does not leak and 104 can be insulated for a long time. FIG. 2 shows an embodiment in which an insulating liquid 201 is put in a bag 205 instead of a container. Even if the area around 205 is water or seawater, if the metal, which is the material of the cable 203, is covered with 201, it does not come into contact with water and does not leak. The upper part of 205 filled with 201 is tied with a string 206 and 2
Make sure that 01 does not leak. In the case of 205, the outer shape is freely deformed, so that 203 can be connected even in a narrow place. If the tip of 203 is a connector, it can be easily attached and detached. For 101 and 201, tricresyl phosphate, which is a synthetic insulating oil, is suitable for this application. If the insulating liquid is lighter than water, the liquid moves upward due to buoyancy due to the difference in specific gravity. For this reason, the mouth of 102 is turned downward in the opposite direction to FIG. 1, or the lower part of 205 is tied by 206 so that liquid lighter than water does not leak to the outside. For liquids lighter than water, silicone oil is suitable for this application. Figure 3 shows the cable 3
03 was performed as shown in FIG.
After that, the connection portion 304 is covered with a material 307 having a high elasticity such as rubber,
This is an embodiment in which both ends are brought into close contact with 303 with elasticity. If 303 is connected in 102 filled with 101, and the portion is covered with 307, an insulating liquid 3 is surrounded around 303.
01 is covered. If the 307 covered with the 304 is in close contact with the 303, the 307 may be kept horizontal even underwater or in seawater.
1 does not leak outside. In the water, the connection work must be performed in a state where water pressure is applied.
07, there is no difference between the pressure of water outside 303 and 307 and the pressure of inside 301. For this reason, 307
An isotropic pressure is applied to the part 301 around the inner part 304 and the connection work of the part 303 can be performed in the same manner as in the atmosphere without flowing. When the water pressure is high, 303 is tightened in advance near the cutting, the pressure inside 303 is increased, and then cutting is performed, so that 301 does not permeate into 303. The embodiment shown in FIG. 4 is used as a switch underwater. In this example, as in the embodiment shown in FIG. 3, the portion of the electrode 408 covered with the insulating liquid 401 is adhered to the cable 403 using a material 407 having a high elasticity such as rubber. Normally, a plurality of 408s are separated from each other, but when used, a force is applied to make them come into contact with each other to form a switch for the device. The embodiment shown in FIG. 5 is a method of connecting an electrode 508 provided in an insulating liquid 501 with a clip 509 interposed therebetween. When the current capacity to be supplied is large like a power supply line, as shown in the embodiment of FIG.
Power supply line 611 with knife-edge type switch 610
It is convenient to connect. Figure 7 shows equipment 7 installed underwater
This is an embodiment in a case where a cable 703 is connected to the “00”.
Attach a connector 705 to 700, and attach 7
03 is connected to the connector 704 attached to the tip. In this case, an insulating liquid 701 heavier than water is used to protect the connection. The container 702 is provided with 700 so that 701 does not flow out, and this 702 is filled with 701. 702 is 701 which is heavier than water and 704 or 705
Is protected from leakage. If an insulating liquid lighter than water is used, the opening of 702 may be directed downward.
The embodiment shown in FIGS. 8 to 11 is a method of connecting the power supply electrode 808 of the device 800 fixed to the bottom of the boring hole to the power supply line 808 extending from the ground surface. In the insulating liquid 801 which is heavier than water, the sectional view of FIG.
As shown in the perspective view of FIG. 7, the inside of a container 802 provided at the bottom of the hole is filled with 801 and the inside of the container 802 and the cable 8 above are filled.
Connect 808 at the tip of 03 using gravity. As shown in the cross-sectional view of FIG. 10 and the perspective view of FIG. 11, in an insulating liquid 1001 lighter than water, a bent electrode 1008 is connected in a container 1002 opened downward. In this case, after the cable 1003 is lowered until the distal end 1008 reaches the bottom, the cable 1003 is pulled up until it contacts the 1008 of the device 1000 fixed to the bottom of the boring hole. If the extended power line is taken up after charging 1000, the power line will not be obstructed and the boring hole can be easily used for other purposes. If it is in an insulating liquid, you can easily connect and disconnect cables using connectors. Even in underwater or seawater, there is no leakage from the connection part or connector if it is in a container or bag containing an insulating liquid. Therefore, the cable can be cut, connected, or replaced underwater or in seawater by following the procedure below. 1) First, a container as shown in the embodiment of FIG. 1 is filled with an insulating liquid. 2) Submerge the container filled with liquid in water or seawater. 3) Cut the cable in the liquid of the immersed container and attach a connector if necessary. 4) Connect a new cable in the liquid so that the liquid does not leak. 5) If necessary, connect another end of the cable cut in the same way. The point of the present invention is that the container 102 filled with the insulating liquid 101 is submerged in water as in the embodiment shown in FIG.
01 is to connect the cable 103. Since the connection unit 104 is covered with 101, there is no leakage. With this method, it is possible to repair the underwater or seawater 103 while laying it.
It is not necessary to lay a new, and the laying cost can be reduced. When the water pressure is high, tighten 103 in advance near the point where 103 is cut, and after increasing the pressure inside 103,
Cut 103 according to the operations described in 1) to 5) above. If the pressure inside 103 is high, 101 becomes 10
3 does not penetrate inside. It is effective to shift the location and tighten 103 at multiple locations. As shown in FIG. 2, the connector at the end or the end of the cable is
Protect with a bag 205 filled with an insulating liquid 201,
As shown in the embodiment shown in FIG. 3, it is protected with an elastic material 307 and moves underwater or seawater, and as in the embodiment shown in FIG. The cable is connected in the filled container 102.

[Effects of the Invention] If the connecting portions of the cable and the electrodes are placed in an insulating liquid, the leakage of electricity can be prevented without the metal that is the material contacting the water. Therefore, if an insulating liquid is used, the cable can be connected and detached underwater and in seawater as well as on the ground, which is convenient. In addition, it is possible to protect the cable connections and electrodes not only in water or seawater but also in places with high humidity or where seawater is sprayed, and in places where water falls down along the cable, use liquids heavier than water. The connection and the electrodes can be protected. on the other hand,
Cables can be connected as necessary to transmit signals and to connect underwater and seawater, even between equipment on the surface of the ground and equipment installed underwater or in seawater where cables cannot be used at all times. Power can be supplied to the equipment. In addition, the use of boreholes is indispensable for underground surveys, but if the cables of equipment installed in the boreholes can be eliminated, various surveys can be performed with the same borehole and the drilling hole drilling cost can be reduced.

[Brief description of the drawings]

FIG. 1 shows an embodiment in which a cable is connected in a container containing an insulating liquid heavier than water (cross-sectional view).

FIG. 2 is an embodiment (cross-sectional view) of connecting a cable in a bag containing an insulating liquid heavier than water.

FIG. 3 is an embodiment (cross-sectional view) in which a cable connection portion is covered with a material having high elasticity so that an insulating liquid does not leak.

FIG. 4 is an embodiment (cross-sectional view) in which electrodes are separated in a liquid and covered with a material having high elasticity so that an insulating liquid does not leak.

FIG. 5 is an embodiment (cross-sectional view) of connecting an electrode in an insulating liquid with a clip.

FIG. 6 is an embodiment (cross-sectional view) of connecting a cable with a knife-edge type switch in an insulating liquid.

FIG. 7 is an example (a cross-sectional view) of attaching a cable to a device installed in water.

FIG. 8 shows an embodiment (cross-sectional view) of connecting a power supply line in an insulating liquid heavier than water at the bottom of a hole.

FIG. 9 is an embodiment (perspective view) in which a power supply line is connected in an insulating liquid heavier than water at the bottom of a hole.

FIG. 10 shows an embodiment (cross-sectional view) in which a power supply line is connected in an insulating liquid lighter than water at the bottom of a hole.

FIG. 11 is an embodiment (perspective view) of connecting a power supply line in an insulating liquid lighter than water at the bottom of a hole.

[Explanation of symbols]

101 ... insulating liquid, 102 ... container, 1
03 ... cable, 104 ... connection part, 201 ...
Insulating liquid, 203 ... cable, 205
... bag, 206 ... string, 301 ... insulating liquid,
303 ... cable, 304 ... connection part, 307
... elastic material, 401 ... insulating liquid,
403… cable, 407… elastic material,
408 ... electrode, 501 ... insulating liquid, 50
8 ... electrode, 509 ... clip, 601 ...
Insulating liquid, 610: Knife-edge switch, 611: Power line, 700: Equipment installed in water, 701: Insulating liquid, 702: Container, 703: Cable, 704: Connector, 705: Connector, 800 … Equipment fixed to the bottom of the borehole, 801… insulating liquid,
802: container, 803: cable, 808
... electrode, 1000 ... equipment fixed to the bottom of the borehole, 1001 ... insulating liquid, 1002 ...
Container, 1003 ... Cable, 1008 ... Electrodes.

Claims (4)

[Claims] 1. A method of connecting a cable in water, comprising connecting a conductor in an insulating liquid. 2. A method for connecting a cable underwater, wherein a means for covering a connecting portion provided on a conductive wire with an insulating liquid is provided to prevent leakage of the connecting portion. 3. A method of connecting a cable underwater, wherein a means for covering a contact portion provided on a conductive wire with an insulating liquid is provided to prevent electric leakage of a contact. 4. A method of connecting a cable provided in water, wherein means for covering a switch provided on a conductive wire with an insulating liquid is provided to prevent leakage of the switch.