JPH0145214Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to a fixing clamp for pulling down the tower body of an optical fiber-containing electric wire installed at the overhead ground wire position of a steel tower.
Specifically, it relates to a fixing clamp for a jumper section of electric wires leading to an optical fiber junction box section disposed below the steel tower.

<Prior Art> Recently, with the development of optical fibers, attempts have been made to incorporate optical fibers into electric wires for information transmission. For example, in a transmission line tower, an optical fiber-containing electric wire is installed at the overhead ground wire position to also serve as information transmission. However, one of the troublesome aspects of installing optical fiber wires is the wire-to-wire connection work, which requires precision. In this case, it is practically difficult for workers to climb to the top of the steel tower to work, and generally the tip of the wire that has been temporarily tied to the top of the steel tower is used as a jumper drawer, and is pulled down along the tower member.
Connection work can now be done using a connection box installed at a lower position. However, it is desired that this pull-down jumper wire section guide the inside of the tower body so as to be less susceptible to external disturbances, but there is currently no fixing clamp to deal with such a situation, and early development is desired.

<Problems to be solved by the invention> In view of the above-mentioned circumstances, the invention proposes to install an optical fiber-containing electric wire (optical fiber composite ground wire) that is pulled down from the top of the steel tower.
It is an object of the present invention to provide a tower lowering fixing clamp which is clamped within the tower frame.

<Means for Solving the Problems> The present invention forms an L-shaped belt-shaped support body whose base end is a contact part for a steel tower member and the hooked tip is a wire receiving part, and a supporting body drilled in this wire receiving part. A holding fitting with wire receiving grooves arranged on both sides is attached to a tightening bolt inserted into the hole to serve as a wire clamp part, and stops for clamping the steel tower member are arranged at front and rear positions of the steel tower member abutting part, and a mounting part is provided. With this configuration, this attachment part is fixed to the steel tower member so that the electric wire clamp part serving as the tip is located inside the tower body, and the optical fiber-containing electric wire pulled down to the electric wire clamp part is clamped.

<Example> Hereinafter, the present invention will be explained based on the drawings of the example.

Figures 1, 2, and 3 are for clamping a pair of optical fiber-containing electric wires, and 1 is L-shaped as a whole, with the base end serving as a steel tower member abutting part 2 and the hooked tip serving as a wire receiving part 3. In the belt-shaped support body, shaft holes 4, 4 for fasteners are bored in two places, which are the front and rear positions of this steel tower member abutting part 2, and one shaft hole 4' for a wire holding fitting is bored in the wire receiving part 3. The tightening bolt 5 is inserted into the shaft hole 4', and the nut 5a is inserted through the hole 8 bored in the center of the holding fitting 7, which has wire receiving grooves 6, 6 carved in parallel on both sides.
are screwed together, and a mounting bolt 9 with a hook portion 9b at the tip that serves as a stop is inserted into one of the fastener shaft holes 4.
A mounting bolt 9 for arranging a clamping seat 10 is provided in the shaft hole 4 which becomes the other elongated hole 4a, and these together form a fixed clamp 11.

When using this fixing clamp 11, first place the flat steel tower member abutting part 2 of the belt-shaped support body 1 at a predetermined location on the steel tower member 12 made of angle material, and in this state, tighten the steel tower member abutting part 2. A mounting bolt 9 with a hook portion 9b is arranged on the one-sided angled surface 12a, which has a hooked surface, and the base of the mounting bolt 9 is inserted into the shaft hole 4, and the hook portion 9b at the tip is inserted into the end of the one-sided angled surface 12a. Hang it on the edge, screw the nut 9a into the base of the mounting bolt 9 and tighten it, and the bolt head 9c of the mounting bolt 9 inserted into the other shaft hole 4.
A clamping seat 10 having a clamping claw part 10a that presses one end against the other side angle surface 12b is inserted into the part,
By screwing the nut 9a into the base, the belt-shaped support body 1
is fixed to the steel tower member 12. In this case, the shaft hole 4 of the mounting bolt 9 on which the clamping seat 10 is disposed is a width adjustment hole which becomes an elongated hole 4a, so that it can be applied to shaped steel of various sizes. Also, at this time, the wire receiving portion 3 is desired to be located within the tower structure frame 13 (see FIG. 4).

Here, both ends of the optical fiber-containing electric wires 15, which will become a pair of left and right optical fiber composite ground wires, which are temporarily held at the top of the steel tower by tension clamps 14, etc., are guided downward in parallel as jumper drawers, and the above-mentioned fixation and Place it on the wire receiving part 3 of the broken support body 1, set the holding metal fitting 7 on top of the wire 15 so that the wire receiving groove 6 is positioned, and
Then, insert the tightening bolt 5 into the wire receiving part 3 and clamp it (see Fig. 5). In this way, the end of the electric wire 15 is guided to the connection box 17 of the pedestal 16 through the fixed clamps 11 arranged at several locations on the steel tower.

In this case, when the steel tower member 12 is arranged in an inclined manner, the tightening position of the holding metal fitting 7 is slightly tilted around the central tightening bolt 5 (the holding fitting 7
is supported at one point so it can rotate freely), it is just a wire 15
(See Figure 6). In addition, when the hook bending direction of the angle material that becomes the steel tower member 12 is opposite to the above, the steel tower member contact portion 2
A hook member mounting bolt 9 is arranged on the elongated hole 4a side,
Attach and fix the mounting bolts 9 that arrange the clamping seat 10 into the shaft hole 4 on the distal end side (see Fig. 7). Furthermore, when the electric wire 15 is a double wire, as shown in FIG. 8, a structure in which two presser fittings 7 arranged on the electric wire receiving part 3 of the support body 1 are arranged side by side is adopted. This wire receiving part 3 is made a little longer, two shaft holes 4' are bored therein, and two holding fittings 7 having wire receiving grooves 6, 6 on both sides are used.

In addition, when the steel tower member 12 is made of pipe material, the steel tower member abutting portion 2 on the base side of the belt-shaped support body 1 is formed with a curved portion 2a that wraps around the pipe material, and the curved portion 2a opposite to this is formed. abutting piece 2' with
are combined to form a structure in which mounting bolts 99 are inserted on both sides (see Fig. 9).

<Effects of the invention> As mentioned above, the tower body pull-down fixing clamp for optical fiber-containing electric wires of the present invention has a support structure in which the abutting part attached to the steel tower member and the wire receiving part facing the inside of the tower body are hooked. By arranging a main body and a wire holding metal fitting and a steel tower member fastener, the optical fiber-containing electric wire that is drawn down from the top of the tower body in a jumper shape can be fixed inside the tower body along the steel tower member. This provides a guide that does not get in the way when working on the tower or when raising and lowering the tower. In addition, this holding bracket has a tiltable structure that supports it at one point relative to the wire receiving part, so it is not affected by the tilt of the angle material, and in other words, the directionality is free, so it can be installed at the main pillar of the steel tower. It can be attached not only to timbers but also to various positions such as belly timbers and diagonal timbers. Furthermore, since the position of the stop on the contact part side is a slider type, there is a range of angle size applications, and it is possible to deal with various tower bodies by simply preparing several types of fixing clamps. Furthermore, this invention uses angle materials,
Since it has a structure that can be attached to steel tower components such as pipe materials as a clamping type, there is no need to drill holes in angle materials or pipe materials or perform special installation processing, making it easy to handle without reducing the strength of the component. It has practical effects such as:

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Figure 1 is a plan view, Figure 2 is a side view, Figure 3 is a front view, and Figure 4 is a front view.
The figure is an explanatory view from a plane showing the installation state, Fig. 5 is a side view of the use state, Fig. 6 is an explanatory view of the presser fitting part, Fig. 7 is a plan view showing another installation state, and Fig. 8 is a side view of the use state. FIG. 9 is a plan view showing two presser fittings arranged, and FIG. 9 is a plan view showing a state in which pipe material is used. 1... Band-shaped support body, 2... Steel tower member contact part,
3... Wire receiving part, 4, 4'... Shaft hole, 5... Tightening bolt, 6... Wire receiving groove, 7... Holding metal fitting, 8...
...hole, 9...mounting bolt, 10...clipping seat.

Claims (1)

[Scope of utility model registration request] An L-shaped belt-shaped support body is formed with the base end as a contact part for the steel tower member and the hooked tip as a wire receiving part, and a holding metal fitting having wire receiving grooves on both sides is supported at one point on this wire receiving part to hold the electrical wire. A clamp for pulling down a tower body of an optical fiber-containing electric wire, which serves as a clamp part and has a stopper for clamping the steel tower member at the front and back positions of the tower member contacting part, and serves as a mounting part.