JPS6141369Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an overhead cable slack measuring device.

Traditionally, to measure the slack of an overhead cable, a worker climbs each pole at each end of the span, with the worker climbing one pole supporting the marker and the worker climbing the other pole looking straight at the marker. , instructs a third worker on the ground to extend and contract the slack rod it supports so that its gage is on the line of sight, and the third worker follows the instructions of the slack rod at this time. The slackness of the cable is calculated from the difference from the indicated value when the slackness rod is shortened and its reference point coincides with the cable.

As mentioned above, the conventional measuring method requires three workers, and when the wind is strong, the sag rod bends due to the wind, making accurate measurements impossible.

This invention was made based on the above circumstances, and includes:
To provide a slackness measuring device capable of measuring the slackness of an overhead cable by a human worker without being affected by wind.

Hereinafter, the present invention will be explained in detail with reference to the drawings. In FIGS. 1 and 2, there is a bar-shaped slide guide 3 on which a slide 2 supporting a telescope 1 is slidably attached, and a scale scale 4 is provided on the upper and lower ends of the back surface of the slide guide 3. Slide guide 3
A fixing band 5 is provided in a plane perpendicular to the axis of the fixing band 5 . These fixing bands are made of spring material and are designed to hold the utility pole 6 and fix the slide guide 4 to the utility pole 6 with one touch.

Further, the telescope 1 is rotatable about an axis perpendicular to its optical axis and perpendicular to the slide guide 4. The mechanism includes, for example, providing a telescope with a cylindrical sleeve perpendicular to its optical axis, engaging this sleeve with a support shaft provided perpendicularly to the slide guide and having a thread carved into the tip, and attaching a stopper to the thread. Constructed by screwing together. That is, by loosening the stopper, the telescope can be tilted, and by tightening it, the telescope can be oriented and fixed at any desired tilting position.

The sag measurement is performed using the device of the present invention having the above configuration as follows. That is, as shown in FIG. 3A, one worker W climbs up the utility pole P ₁ at one end of the span S with the device A of the present invention, and climbs it to a level as close as possible to the cable hanging point C ₁ on the utility pole P ₁ . , the device A of the present invention is fixed to the utility pole _P1 using the fixing band 5. Now, while keeping the telescope 1 in a horizontal position, slide the slide 2 against the slide guide 3, and place the slide 2 at a place where the center of field of view of the telescope 1 coincides with the slide hanging point C ₁ on the utility pole P ₁ . Fix it. Read scale 4 at this time. Next, the telescope 1 is tilted and the telescope is fixed at a location where the center of the field of view coincides with the cable suspension point C ₂ of the utility pole P ₂ at the other end of the span.

In the above condition, slide the slide 2 again as shown in Figure 3B, and fix the slide 2 at a place where the center of field of view of the telescope 1 and the maximum drooping part D of the suspended cable coincide, and the scale at this time is Read 4.

The slackness of the cable is obtained from the difference between the first scale reading and the second reading.

As shown above, align the field of view center of telescope 1 with the cable suspension point _C2 of utility pole _P2 at the other end of the span, and move this in parallel with slide 2 to align the field of view center of telescope 1 with the maximum hanging part D of the cable. By doing so, the sag can be measured even when the suspension points C ₁ and C ₂ at both ends of the span are not at the same level. Note that FIGS. 3A and 3B show the case where the suspension points C ₁ and C ₂ are at the same level. In this case, only parallel movement of the telescope 1 is sufficient, and its tilting is not necessarily required.

As is clear from the above, the device of the present invention allows one worker to measure the sag, and since no sag rod is used, the measurement can be carried out accurately without being affected by wind.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a front view thereof, and FIGS. 3A and 3B are schematic diagrams for explaining the sag measurement method according to the embodiment. 1...Telescope, 2...Slide, 3...Slide guide, 4...Scale scale, 5...Fixed band,
6...Telephone pole.

Claims (1)

[Scope of utility model registration request] A rod-shaped slide guide, a fixing band capable of fixing the slide guide to a utility pole substantially parallel to the axis of the utility pole, a slide attached to the slide guide so as to be slidable in its longitudinal direction, and an optical axis attached to the slide. 1. An aerial cable sag measurement device comprising: a telescope mounted to allow free tilting and localization;