JPS6114604A - Method for drawing wire body into thin diameter cylindrical body - Google Patents

Abstract

PURPOSE:To draw a wire body easily into a long-sized thin-diameter cylinder by running and moving a differential pressure propulsive body fitted into a hollow part in a thin diameter cylindrical body, in the cylindrical body by utilizing a pressure difference of the inside of its cylindrical body. CONSTITUTION:When drawing a wire body W into a thin-diameter cylindrical body 3, a differential pressure propulsive body 6 which has installed the wire body W (an optical fiber cable or a lead wire) to a rear end side 6a is fitted airtightly into a hollow part 3a in the thin-diameter cylindrical body 3, and subsequently, a pressure difference is generated in the hollow part 3a by setting its differential pressure propulsive body 6 as a boundary so that the side in which the wire body W exsists, and the side in which the wire body W does not exist become a high pressure and a low pressure, respectively. As a result, by this pressure difference, the propulsive body 6 is run and moved in the thin diameter cylindrical body 3 toward the low pressure side from the high pressure side, and the wire body W is drawn into the thin-diameter cylinder 3.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the installation of an optical fiber cable, for example, into a small-diameter cylinder such as a protective cylinder in which an installed overhead ground wire is incorporated. The present invention relates to a method of drawing a linear body into a small diameter cylinder, which is suitable for use when drawing a linear body such as a lead wire.

[Conventional technology and its problems]

In recent years, optical fiber cables used as signal transmission cables have been incorporated into overhead ground wires, and optical/power composite cable lines have been constructed. In this case, as shown in Figure @3, a protective tube 3 made of an aluminum pipe or the like is placed in advance at the center of the metal stranded wire layer 2 forming the overhead ground wire 1i.
A hollow portion 3aQ is formed in advance, and an optical fiber hoople W(4) is inserted into the hollow portion 3& as necessary to construct an optical/power composite cable line.

By the way, in this case, since the inner diameter of the above-mentioned susceptor tube 3#'i is small, from several millimeters to more than ten millimeters, an optical fiber cable or its optical fiber cable is later installed inside the protection tube 3 of the above-mentioned overhead ground wire. There are many difficulties involved in inserting the striatum W in the width of the lead wire for retraction.

[Purpose of the invention]

This invention was made in view of the above circumstances, and inside a long and narrow cylinder such as a protective cylinder installed inside the overhead ground wire,
The purpose of this invention is to provide a method for drawing a filamentous body such as an optical fiber cable or a lead wire into a small-diameter cylindrical body extremely easily and using a simple device. be.

[Structure of the invention]

The method of drawing a filament into a small-diameter cylinder of the present invention is to airtightly fit a differential pressure propelling body with a filament attached to the rear end side into the hollow part of the small-diameter cylinder, and then the differential pressure A pressure difference is created such that the side where the striated body exists in the hollow part with the propelling body as a boundary has a high pressure, and the side where the striated body does not have a low pressure,
The pressure difference causes the differential pressure propelling body to move within the narrow cylinder from a high pressure side to a low pressure side, thereby drawing the filamentous body into the narrow cylinder. .

〔Example〕

FIG. 1 shows a wire such as an optical fiber cable 4 or a lead wire 5 inside a small-diameter cylinder (protective cylinder) 3 provided at the center of an overhead ground wire l made of a metal stranded wire layer 2 according to the present invention. This is an example of pulling in the strip W'ft.

A differential pressure propelling body 6 is connected to the tip of the filament W to pull it within the narrow cylinder body 3.

The bottom surface of the differential pressure propulsion body 6Vi cone is gradually deepened from the periphery toward the center to form a concave pressure receiving section 6a, which has a blowgun-like appearance. It consists of a handle 6b extending outward on the axis of the pressure receiving part 6a, and is integrally molded from a highly elastic synthetic resin such as polyvinyl chloride resin. The outer diameter of the pressure receiving portion 6 and the peripheral edge portion of the differential pressure propelling body 6 is slightly larger than the inner diameter of the narrow diameter cylinder 3.

Further, a compressed air supply device 7 is attached to the end of the narrow cylinder body 3 for supplying compressed air toward the hollow portion 3 & to give the differential pressure propelling body 6 a force for pulling the filament body w6. . This compressed air supply device 7 is made of a material having a predetermined strength and elasticity, such as hard rubber, and is approximately cylindrical in appearance with a bottom, and has an insertion hole in the center of the bottom KFi through which the filament W is inserted. 7a is bored. The open end of this compressed air supply device fR7 bulges inward by a predetermined length,
A mounting portion 7b is formed, the inner diameter of which is slightly smaller than the outer diameter of the narrow-diameter cylinder 3. The compressed air supply device 7 is also equipped with a supply v7o for supplying compressed air into the device from the outside.

However, in the method of pulling in the striations in this example, the metal stranded wire layer 2 at the end of the overhead ground wire 1 is peeled off at the support tower part (not shown) of the overhead ground wire 1, and then incorporated into the center part. A predetermined length of the small diameter cylindrical body 3 is exposed.

Then, the filament W such as an optical fiber cable or a lead wire to be drawn into the small diameter cylinder 3 is connected to the compressed air supply device ff.
After passing it through the insertion hole 7a of No. 17 toward the inside of this device, its tip is connected to the handle 6b on the rear end side of the differential pressure propelling body 6.

Next, the differential pressure propelling body 6 is inserted into the narrow diameter cylinder 3 from the tip of the pressure receiving part 6&. At this time, the pressure receiving part 6 &
Since the outer diameter of the peripheral edge of is made slightly larger than the inner diameter of the small diameter cylinder 3, the peripheral edge of the pressure receiving part 6& is in close contact with the inner peripheral surface of the small diameter cylinder 3, so that this pressure receiving part 61L becomes K when the hollow part 3& in the small-diameter cylinder 3 is divided into left and right halves in the length direction (airtightly at the right place).

Next, the compressed air supply device 7'ft and its mounting part 7b
It is fixed to the end portion of the small diameter cylindrical body 3 by fitting it onto the outer periphery of the end portion of the small diameter cylindrical body 3 while pushing it apart. Then, compressed air of a predetermined pressure is sent from the illustrated high-pressure compressed air cylinder, air compressor, etc. via a pressure reducer from the supply pipe 7o through the compressed air supply device 7 to the small diameter cylindrical body 3. It is sent into the hollow part 3a. Then, the differential pressure propelling body 6, which airtightly blocks the inside of the hollow part 3a of the small-diameter cylinder 3, is applied with a propulsive force in the direction of the tip due to the pressure difference generated between the front and back, and moves in the direction of the arrow in the figure. When it moves inside the hollow part 3&, it becomes . Therefore, the filamentous body W#i connected to the handle 6bK on the rear end side of the differential pressure propelling body 6 is pulled by the travel of the differential pressure propelling body 6 and drawn into the small diameter cylinder 3 one after another.

Therefore, according to such a method of drawing the filamentary body W into the small diameter cylinder 3, light can be introduced into the cylinder 3 made of a small diameter and long aluminum vibrator, etc., without requiring a large device. The filament Wf of the fiber cable 4 and lead wire 5# can be drawn in very easily.

In the above embodiment, the pressure receiving part 6a of the differential pressure propelling body 6
Although the external appearance is like a blowgun, it is not limited to this. For example, a disk-shaped pressure receiving part 6 as shown in FIG. 2 is used.
1i- It may be a type in which a plurality of pieces are connected.In short, it is sufficient as long as it is inserted into the small diameter cylinder 3 and airtightly blocks the inside of the hollow portion 3& from the left and right.

Further, in the above embodiment, the compressed air supply device 7&c
Therefore, the handle 6b side of the differential pressure propelling body 6 is set as the high pressure side, but the present invention is not limited to this, and conversely, an air suction device (pressure reducing device) is provided at the other end of the narrow diameter cylinder 3 to increase the pressure of the differential pressure propelling body 6. It is also possible to create a predetermined pressure difference by applying a vacuum (negative pressure) to the tip end of 6.

〔Effect of the invention〕

As explained above, according to the present invention, the sound of the differential pressure propellant fitted into the hollow part of the small-diameter segment body is moved inside the cylinder by utilizing the pressure difference within the cylinder. A filament such as an optical fiber cable or a lead wire attached to the rear end side in the running direction can be easily inserted into a long narrow-diameter cylinder made of a protective SM or the like built into an overhead ground wire by a simple means. It is something that can be drawn in.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a first embodiment in which the method of the present invention is being carried out, Fig. 2 is an explanatory diagram showing another embodiment of the method of the present invention, and Fig. 3 is an explanatory diagram showing a state in which the method of the present invention is implemented. FIG. 3 is a schematic cross-sectional view showing a state in which the filament body is drawn into the hollow portion. 3...Small diameter cylindrical body, 3IL...Hollow part,
6... Differential pressure propellant, 6a... Rear end, W
・・・・・・Striatum (optical fiber/(cable or lead wire).

Claims (1)

[Claims] In the hollow part (3a) in the small diameter cylinder (3), on the rear end side (6b)
A differential pressure propelling body (6) with a striated body (W) attached thereto is hermetically fitted, and then the striated body (W) is present in the hollow portion (3a) with the differential pressure propelling body (6) as a boundary. The pressure is high on the side where the
In addition, a pressure difference is created so that the pressure is lower on the side where the striated body (W) does not exist, and this pressure difference causes the differential pressure propellant (
6) from the high pressure side toward the low pressure side in the small diameter cylinder (3), and the filament body (W) is moved inside the small diameter cylinder (3) from the high pressure side to the low pressure side.
3) A method for drawing the striatum into a small-diameter cylinder, which is characterized by drawing the striatum inward.