JP2755474B2 - Twisting method of self-supporting cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] In the present invention, a twist is automatically given to a self-supporting cable during drawing, and a special twist insertion work is required after the drawing. And a new self-supporting cable twisting method.

[Prior Art] As shown in a sectional view of FIG. 8 (a) and a stepped front view of FIG. 8 (b), a self-supporting communication cable 20 has a cable core 21 and a support wire. 22 are integrally covered with a common sheath 23, and the cable core 21 side and the support wire 22 side are integrally connected by a neck 24.

By being integrated with the common sheath 23 in this way, the support wire 22 and the cable core 21 can be laid at the same time, so that the construction cost can be greatly reduced and the support wire is exposed. It also has the advantage of being less susceptible to corrosion.

In order to lay the self-supporting communication cable having the above configuration on a utility pole or the like, the cable is generally extended by attaching an end fitting for extension as shown in FIG.

That is, 1 is a messenger wire wound by the winch 10 (see FIG. 1), 2 is a twisted metal member for preventing twisting, and 3 is a twist prevention device. There is a flexible weight 4 which is in a falling state, and this weight prevents the cable 20 from being twisted during extension. 5 is a cable grip for gripping the cable tip.

As shown in FIG. 1, the leading end of the cable 20 is pulled out from the drum 6, and the above-mentioned extension metal fittings are mounted between the messenger wire 1 and the cable 20, and the hanging metal fittings of the electric poles at both ends of the extension section are provided. No.4 car as shown in Fig.6 in 7,7
9 and 9, and the second metal wheels 8, 8 as shown in FIG.
Is wound up by the winch 10, so that the cable 20 is extended in exchange for the messenger wire 1.

[Problems to be Solved by the Invention] As can be seen from FIG. 8, the self-supporting type cable 20 has a neck portion 24. If the cable is laid in this state, it receives a large wind pressure, and large vibrations occur in the cable 20 such as dancing. easy.

For this reason, as described above, during the wire drawing, the cable 20 is drawn straight without adding a twist, but after the wire drawing is completed, the cable 20 is twisted, and the vibration due to the wind pressure occurs. It is in a difficult state.

However, this twisting operation is an operation under a condition of poor footing at a high place because the cable 20 is twisted on a utility pole, and is an operation with much danger.

An object of the present invention is to solve the above-described problems of the related art, and without performing twisting work on a cable after wire drawing,
It is an object of the present invention to provide a new self-supporting cable twisting method for automatically twisting a cable while extending the wire.

Means for Solving the Problems According to the present invention, a cable twist insertion tool whose outer periphery is formed in a twisted state is attached to the tip of a self-supporting cable, and the twist insertion tool can pass while twisting. A roller is installed on a utility pole, and the torsion insertion tool is pulled by a messenger wire to allow the torsion insertion tool to pass through each roller while being twisted, thereby imparting a twist to the self-supporting cable. It is an extension.

[Function] If a tool that passes while twisting at the telephone pole is attached to the tip of the cable, the cable will be twisted at the same time as the wire is drawn, and twist insertion work at high places where there is a danger after the wire is drawn. Becomes unnecessary, and the wire drawing efficiency can be improved and safety can be ensured.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples.

FIG. 1 is an explanatory view showing a state in which the self-supporting cable 20 is extended by the method according to the present invention.
The same reference numerals as those in the drawings denote the same components.

In the present invention, the 4th wheel is used for the first electric pole of the extension line in order to smooth the extension line, but for other electric poles, the girder rollers 14, 14 are suspended from the suspension fittings 7, 7. It is fixed below.

FIG. 2 shows a specific example of the torsion insertion tool 11 at the end of the extended wire used in the laying method according to the present invention. On one side, a cable insertion fixing hole 12 for inserting and fixing a cable is provided. At the other end, a connection fixing protrusion 13 connected to the messenger wire 1 is formed.

FIG. 1 is an explanatory view showing a state in which the twist insertion tool 11 is attached to the cable 20 pulled out from the drum 6, is connected to the messenger wire 1, and the drawing is started from this.

The torsion insertion tool 11 has, for example, a shape obtained by twisting a square pole as shown in FIG. This is merely an example, and the shape is not limited to a square pillar, and any shape may be used as long as forced twisting occurs when the roller passes. A plurality of the twist insertion tools 11 can be connected in the longitudinal direction.

FIG. 3 is an explanatory view showing a state in which the twist insertion tool 11 passes through a girder roller 14 suspended and fixed to a utility pole.

Since the tool 11 passes through the girder roller 14 which makes good contact with the outer periphery of the twisted square pillar, the tool 11 forcibly generates a twist according to the twisted state of the tool 11 and forcibly rolls the roller.
Pass through 14. The torsion of the tool 11 is transmitted to the cable 20 as it is, and the torsion to the cable 20 increases each time it passes through each cross-girder roller 14.
Is automatically given a necessary twist.

Therefore, the cable may be fixed to the telephone pole as it is, and it is not necessary to perform the twist insertion work at a high place again.

In addition, the shape of the twist insertion tool is not limited to the above-described quadrangular prismatic shape, and the roller that passes therethrough is not limited to the cross-girder shape.

In short, there is no problem as long as a forced rotation occurs when passing through a telephone pole and the rotation can be transmitted to the cable.

[Effects of the Invention] As described above, according to the laying method according to the present invention, a necessary twist can be automatically added to a cable being extended,
It is possible to omit dangerous and troublesome twist insertion work at a high place, and it is significant that the efficiency of the work itself can be improved and safety can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state of laying work according to the present invention, FIG. 2 is an explanatory perspective view showing an embodiment of a twist insertion tool used in the present invention, and FIG. FIG. 4 is an explanatory view showing the state of the conventional laying work, FIG. 5 is an explanatory view showing the configuration of the extended wire end in the conventional laying, and FIG. Front view of No. 4 car,
FIG. 7 is a side view of the No. 2 wheel, FIG. 8 (a) is a cross-sectional view of the self-supporting cable, and FIG. 7 (b) is a front view of the stepped state. 1: Messenger wire, 6: Drum, 7: Hanging bracket, 10: Winch, 11: Twist insertion tool, 12: Cable insertion fixing hole, 13: Connection fixing protrusion, 14: Cross beam roller, 20: Self-supporting cable .

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeharu Takeyama 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Works, Hitachi Cable Co., Ltd. (72) Inventor Kenichi Saito Hidakacho, Hitachi City, Ibaraki Prefecture 5-1-1, Hidaka Electric Wire Co., Ltd. (72) Inventor Shinichi Yoshida 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Pref. Hitachi, Ltd. In Hidaka Factory (72) Inventor Numata Kameji 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Hidaka Works, Hitachi, Ltd. (72) Inventor Isamu Omoto 2-1-2, Marunouchi, Chiyoda-ku, Tokyo Inside Hitachi Cable Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) H02G 1/02 H02G 1/06

Claims (1)

(57) [Claims] A self-supporting cable is provided with a cable twist insertion tool having a twisted outer periphery at the end thereof, and a roller through which the twist insertion tool can pass while being twisted is installed on a telephone pole. By pulling the torsion insertion tool with a messenger wire, the torsion insertion tool is allowed to pass through each roller portion while being twisted, thereby providing a torsion to the self-supporting cable. Twisting installation method.