JPS5922761Y2 - Power cable offset section - Google Patents

Description

[Detailed description of the invention] The present invention relates to an offset portion of a power cable, and in particular, both end surfaces of a reinforcing ring that covers the offset portion of the power cable are tapered so as to narrow toward the center of the offset curve. This relates to improvements to the power cable offset section.

The present applicant has proposed a power cable offset part that can absorb the amount of cable extension before a high reaction force is generated in the power cable part that is offset first (Japanese Patent Application No. 55-180349 ).

This power cable offset section is shown in Figure 1.
The power cable 1 is led out from the underground conduit and offset until reaching the junction box 2 in the manhole, and a plurality of reinforcing rings 3 are arranged and covered in the axial direction over the offset cable portion 1a.

These reinforcing rings 3 are bound together by a plurality of tension members (not shown) passing through the through holes.

Each reinforcing ring 3 is tapered so that both end surfaces become narrower toward the center of the offset curve of the cable portion 1a.

In the left hand part of the offset cable part, the center of offset curvature is on the lower side, so the reinforcing ring 3 covering this left half is narrow downward, and the right half is at the center of offset curvature. is on the upper side, so the reinforcing ring 3 covering this right half is narrow upward.

In this structure, when the power cable 1 thermally expands and is extended at the cable portion 1a, the reinforcing ring 3 is displaced from the arrangement shown in FIG. When an amount of extension is added due to expansion, the inside of the offset curve closes and the outside opens.

Since no tension is applied to the tension member that binds the reinforcing ring 3 until the reinforcing ring 3 opens on the outside of the offset curve, the amount of cable extension can be absorbed without generating a high reaction force during this time.

However, since the taper of each reinforcing ring 3 at this power cable offset part is so small that it cannot be visually distinguished, there is a risk of erroneous orientation when covering the cable portion 1a with these reinforcing rings. If this direction is incorrect, it will not be possible to absorb the amount of cable extension before the high reaction force is generated.

An object of the present invention is to provide a power cable offset part that allows a reinforcing ring to be covered with high workability without erroneously oriented the reinforcing ring.

The embodiment of the present invention will be described in detail with reference to the drawings.
Figures A and B show a reinforcing ring 3 used in the power cable offset portion according to the present invention.

The power cable offset portion is exactly the same as that shown in Fig. 1, and in the illustrated example, the reinforcing ring 3 is split in half, and adjacent reinforcing rings 3 are split alternately so that their split surfaces are at right angles. It's on a different side.

In FIG. 1, reference numeral 4 denotes a support fitting that supports the reinforcing ring 3 at the end of the conduit port side and the connection box 2 side to a fixed metal fitting (not shown) in the manhole.

FIG. 2A shows a reinforcing ring 3A with a vertical split surface, and FIG. 2B shows a reinforcing ring 3B with a horizontal split surface.

The reinforcing ring has an indicator 5 that indicates the direction of taper.

Although the display body 5 has a substantially triangular arrow pointing downward at the apex formed on the surface of the reinforcing ring, it may alternatively be a square arrow.

In the embodiment shown in FIG. 2A, each of the left and right halves 31A and 32A has an arrow pointing from the wide part to the narrow part,
In the embodiment shown in FIG. 2B, an arrow is provided across the upper and lower halves 31B and 32B.

With such a display body 5, the reinforcing ring 3 can be placed over the offset cable portion 1a as shown in FIG. 1 without erroneously oriented the reinforcing ring 3.

Furthermore, since the display body 5 has arrows that directly indicate the direction of the taper, when it is reassembled for repairs after a long period of time, it can be easily reassembled without having to review construction records or the like.

In FIG. 2, reference numeral 6 indicates a through hole through which the tension member passes.

According to the present invention, as described above, since the reinforcing ring has an indicator that allows the direction of the taper to be determined, the reinforcing ring will not be placed on the reinforcing ring in the wrong direction, and the characteristics of the tapered reinforcing ring can be reliably maintained. Furthermore, since the reinforcing ring can be assembled with high workability, the power cable offset portion can be obtained economically.

Furthermore, since the indicator directly indicates the direction of the taper, there is no need to review construction records, etc. even when reassembling after a long period of time, and repair work can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a power cable offset portion according to the present invention, and FIGS. 2A and 2B are enlarged perspective views of a reinforcing ring used in the present invention. 1... Electric cable, 1a... Cable part, 3, 3A, 3B... Reinforcement ring, 5...
...Display body.

Claims (2)

[Scope of utility model registration request] (1) A plurality of reinforcing rings arranged in the axial direction are covered with the offset electric cable portion, and the plurality of reinforcing rings are bound by a plurality of tension members passing through the reinforcing rings, and Each of the plurality of reinforcing rings is formed on the surface of the power cable offset portion, in which both end surfaces of the reinforcing ring are tapered so as to become narrower toward the center of the offset curve of the power cable portion. An electric cable offset part characterized by having an arrow indicator indicating the direction of the power cable. (2) The power cable offset portion according to claim 1, wherein each of the plurality of reinforcing rings is divided into two halves.