JP2000125428A - Method for collectively installing three single-core power cables - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress variation in cable behavior and thus make it possible to install cables in such a manner that the running speed of each of three cables is almost constant, by installing the cables by feeding forward the cables with binding materials wrapped around them from a drawing machine placed in a culvert. SOLUTION: A container 3 is placed on a turntable 4 so that it is rotatable, and three cables 1 are simultaneously pulled out using a drawing machine 5. The three cables 1 are passed through encircling rollers 6 and triangularly packed. The cables 2 triangularly packed are passed through a tape wrapping device 7. In the tape wrapping device 7 an arm with a tape rolled around it rotates on the circumference of the cables 2 trianguylarly packed, and spirally wraps the tape 9 around the triangularly packed cable 2. The rotational speed of the arm with the tape rolled around it is proportionally equal to the traveling speed of the triangularly packed cables 2. Therefore, the tape can be wrapped with a constant pitch without stopping the travel of the cables 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a single-core power cable in a tunnel, and more particularly to a method for laying one cable at a time in a usual way.

[0002]

2. Description of the Related Art In general, a power cable used for power transmission comprises three lines. Power cables include:
A three-core cable in which three cables are twisted in advance at a factory and a single-core cable in which one cable is intact are widely used.

[0003] The single-core cable has limitations in the method of manufacturing and transporting the twist with its thickness and length.
It is transported and laid in one state (without twisting or bundling cables) from factory shipment until it is stored in the local tunnel.

However, as an exception, there is a method of laying a power cable in a pipeline, a method of simultaneously drawing three single-core cables into one pipeline hole.

[0005] Cables laid one by one, or simultaneously pulled in and laid out, are finally stored in the tray at three adjacent positions or in the vicinity, restrained by ropes and fasteners, and dropped. We are trying to prevent it.

[0006]

As described above, a single-core cable is obtained by arranging one cable drum or the like wound with one cable at the entrance to the sinus, one by one, and performing the work of attaching one cable at a time. I have.

[0007] The transmission line by the power cable is
A line is formed, and three cables are usually arranged at substantially adjacent positions in the cable storage in the tunnel.

[0008] That is, the cable laying and storing work is repeated substantially the same three times.

Further, after storing the three cables,
They were tied manually with a rope or the like.

[0010] In addition, even when the conventional three cables are pulled in at the same time, there is a possibility that the three cables may move differently on the roller, and may exhibit unstable behavior such as a variation in speed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and three cables are pulled out one by one at the same time, and by bundling them, the cables are treated as one and the cable behavior is improved. Reduce variability,
It is an object of the present invention to obtain a three-stroke collective construction method of a single-core power cable which can easily extend the running speed of each strip so as to be constant.

[0012]

SUMMARY OF THE INVENTION According to the present invention, three cable drums or containers around which a single-core power cable is wound are arranged at an entrance to a sinus, and each of the single-core power cables is connected to the cable drum. Or, it is pulled out of the container and made into a bale stack by passing it through a bale stacker, and the cable in the bale stack is spirally wound around the cable in the bale stack by passing the cable in the bale stack through a binding machine winding device. A single-core power cable triple laying method characterized by winding and laying the three ties of cable in which the binding material is wrapped so as to be sent forward by a wire drawing device arranged in a sinus.

[0013] Further, the present invention is characterized in that the rotation speed of the device for winding the binding material has the same ratio as the traveling speed of the cable.

Further, the binding material is a soft and elastic tape.

Further, the bale stacker is characterized in that a plurality of sets of rollers arranged in an equilateral triangle form one set, and the size of the equilateral triangles is sequentially reduced in the cable extending direction.

[0016] Further, in a state where the binding material is spirally wound around the bale-stacked cable, the cable extended into the sinus can be stored in the laying container with the binding material wound. And

According to the above-described method of the present invention, when the bundled cable passes through the bent portion in the extension route, the inner and outer cable bending diameters are different from each other, so that a difference in length may occur. However, the binding material can prevent collapse of the bales stack shape due to the binding material.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view illustrating a method of laying three single wires of a single-core power cable according to an embodiment of the present invention. In the figure, three containers 3 each containing a single-core power cable (hereinafter, referred to as a cable) 1 are arranged one by one near an entrance to a sinus. The container 3 is loaded on the turntable 4 so as to be rotatable, and the three cables 1 are simultaneously pulled out by the holing machine (caterpillar take-up machine) 5. The three cables 1 drawn out are passed through a surrounding roller 6 of a regular triangular strip which is a bales stacker. The surrounding roller 6 has a shape in which the surrounding frame is narrowed in the traveling direction of the cable 1.
The strips are arranged and shaped in a triangular shape and are stacked in a so-called bales.

Next, the cables 2 stacked in a bale are passed through a tape winding machine 7. The tape winding machine 7 rotates on the outer circumference of the bale-stacked cable 2 through which an arm (not shown) to which the roll-shaped tape is mounted passes, and the tape 9
Spirally wound. The rotation speed of the arm on which the tape is mounted has the same ratio as the running speed of the bale-stacked cable 2. Therefore, the cable 2 can be wound at a constant pitch without stopping traveling. The tape 9 is made of a soft and elastic material so as not to cause damage to the tape or collapse of the roll during the drawing, for the reason described later.
For example, a rubber tape is suitable. In addition, the winding pitch of the tape prevents the collapse of the arrangement of cables stacked in bales,
The displacement of the cable 1 in the longitudinal direction one by one is not restricted. That is, a winding pitch that suppresses radial movement of the bale-stacked cable 2 but does not restrain longitudinal movement of the cable 1 is employed. The winding pitch varies depending on the diameter of the cable 1. For example, when the diameter of the cable 1 is 147 mm, a winding pitch of about 500 mm is required.

The reason for requiring the longitudinal displacement is that when the bundled cable 2 passes through the bend in the extension route, the inner and outer cable bend diameters are different, resulting in a difference in length. It is. The displacement in the longitudinal direction of the cable 1 that occurs when the cable 1 passes through the bent portion due to the elastic tape and the winding pitch of the tape can be absorbed.

The cable 2 thus bundled together in three lines
As shown in FIG. 2, motor rollers (rollers with a driving device) 8 are arranged at regular intervals on the extending route, and a holing machine 5 is arranged at a place where a conveying force is required. It is extended into the cave by force. Reference numeral 11 denotes a chute, reference numeral 12 denotes an R guide, and reference numeral 13 denotes a guide roller. Thus, the cable 2 is smoothly guided into the cave.

The cable 2 thus extended into the cave.
Are stored in a disaster prevention trough or the like with the binding tape 9 wound.

[0024]

As described above, according to the laying method according to the present invention, the number of laying operations can be reduced to one third by laying the single-core power cable in three bundles. Thus, the cost can be significantly reduced. In addition, since the bale-stacked cable is wound around the outer circumference of the running bale-stacked cable at a predetermined pitch in a spiral manner, it is possible to solve the problem of the collapse of the shape of the bale-stacked cable, which is considered when performing three-row laying. Further, since the cable is tied by the tying device at the time of laying, the operation of manually tying the cable after laying the third cable can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a method of laying three single wires of a single-core power cable according to an embodiment of the present invention, showing a pattern before being drawn into a sinus.

FIG. 2 is a schematic view showing a three-row collective laying method of the single-core power cable according to the embodiment of the present invention, showing a pattern after being drawn into a sinus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Single-core electric power cable 2 Cable formed in bales 3 Container 4 Turntable 5 Holing machine 6 Bales forming machine 7 Tape winding machine 8 Motor roller 9 Binding tape

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Katsumi Ishii 1-5-1 Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd. (72) Inventor Shiro 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Co., Ltd. Inside

Claims (5)

[Claims] 1. A cable drum or a container around which a single-core power cable is wound is arranged in three at an entrance to a sinus, and each of the single-core power cables is pulled out from the cable drum or the container to form a bales. The bale-stacked state is obtained by passing the bale-stacked cable through a bundling device, and the bundling material is spirally wound around the bale-stacked cable. 3. A single-core power cable three-line laying method, in which the obtained three lines of cables are laid forward so as to be forwarded by a wire drawing device arranged in a sinus. 2. A binding material around the bale-stacked cable without stopping the running of the cable, while keeping a constant ratio between the rotation speed of the device for winding the bundling material and the running speed of the bale-stacked cable. 3. The method of laying three single wires of a single-core power cable according to claim 1, wherein: 3. The method according to claim 1, wherein the binding material is a soft and stretchable tape. 4. The bale stacker according to claim 1, wherein a plurality of sets of rollers arranged in an equilateral triangle form one set, and the size of the equilateral triangles is sequentially reduced in the cable extending direction. 3. A method for laying three single wires of the single-core power cable according to 1. 5. The cable extended in the sinus with the binding material wound spirally around the bale-stacked cable is stored in a laying container with the binding material wound. 3. The single-core power cable 3 according to claim 1,
Article collective laying method.