JPH02273018A - Structure for laying flat cable - Google Patents

Abstract

PURPOSE:To absorb the vibration in an earthquake, etc., thoroughly by laying a flat cable uprightly inside each wall so that its cross section may be longitudinal and by giving 90 deg. twisting to bend projectingly so that its cross section may be oblong between each wall. CONSTITUTION:When walls 2 and 3 vibrate in the parallel and mutually opposite direction (right wards and leftwards) as shown with an arrow A, the region M from a holder 5 to the part containing a part of a twisting section 10 is deformed as it is apt to bend, so that it absorbs the vibration effectively. When the walls 2 and 3 vibrate relatively upward and downward as shown by arrows B and B, the bend section 11 flexibly answers to it and absorbs the vibration. On the other hand, when the walls 2 and 3 vibrate in the direction of mutually approaching arrows C and C, the vibration is absorbed by bending the cable so that the chevron of the upper projected bend section 11 may be high.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a flat cable laying structure.

[Problems to be solved by conventional technology and inventions] In recent years, buildings, residences, factories, etc. have become larger and higher-rise, as well as the expansion of air conditioning equipment and the spread of various OA equipment.
Electricity demand is increasing significantly. However, if a round cable is used, a voltage drop becomes a problem and a large-sized cable must be used.Therefore, flat cables with less voltage drop are often used.

With the conventional round cables mentioned above, there is no difference in the difficulty of bending (there is no directionality), so when laying a round cable across two adjacent buildings, it is necessary to simply offset it, which causes special problems. There was no.

However, as large-sized flat cables with a conductor cross-sectional area of 400 Peng-1 or more have come into use, when laid across adjacent buildings as described above, the flat cables with a flat cross-sectional shape , there are differences in difficulty in the direction of bending,
When two buildings vibrate (displace) relative to each other (according to their respective natural frequencies) due to an earthquake or the like, a problem arises in that an excessive external force acts on the flat cable. In other words, if the flat cable is laid in a straight line, relative displacement in a certain direction cannot be absorbed, and there is a risk that the flat cable or its connecting portion may be destroyed.

The object of the present invention is to provide a flat cable installation structure that can sufficiently absorb vibrations such as those caused by earthquakes and effectively prevent destruction of flat cables installed between two buildings. On offer.

[Means to solve the problem]

The present invention is a flat cable laying structure that is laid between wall surfaces, in which the flat cable is laid vertically inwardly so that the cross section of the flat cable is vertically elongated. In this case, a curved portion was formed in a convex manner upward or downward by applying a 90 degree angle so that the cross section was horizontally long.

(Function) A flat cable has a direction in which it is easy to bend and a direction in which it is difficult to bend, and has so-called directional properties.In other words, in the cross section, it is difficult to bend in the direction of the long sleeve, which has an elongated circular shape, but it is difficult to bend in the direction of the long sleeve, which is an elongated circular cross section. Easy to turn in any direction.

In the above configuration, due to the 90° twist, vibration (displacement) occurs in the vertical and horizontal directions in the vicinity of both wall surfaces and between both wall surfaces.
This means that there are parts that can be easily bent.

Further, the curved portion formed convexly upward or downward can absorb vibration (displacement) in the direction of approach and separation of both wall surfaces.

〔Example〕

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In Figures 1, 4, and 5, ■ is a flat cable that is laid across the walls 2.3 of two buildings, and both walls 2.3 are parallel to each other. Reference numeral 4 denotes a cable rack, on which the flat cables 1 are supported in a horizontal position, and are held by holders 5 as appropriate. In the rotation, the cable racks 4, 4 are divided at the center of the space between the two walls 6 in order to absorb the relative displacement of the two walls 2, 3 during an earthquake or the like. Of course, although not shown, the cable rack 4 is continuous into one cable, but it is also preferable to provide a connection mechanism that absorbs the above displacement.

As shown in FIG. 2 (or FIG. 3), the flat cable 1 includes, for example, a plurality of conductors 7 made of a highly conductive metal and an insulator such as cross-linked polyethylene covering the conductors 7. 8 and a sheath 9 covering it,
The entire structure has a flat oval cross section. And 2 is long sleeves,
S indicates the short axis.

This Figure 2 shows the ■-■ cross section of Figure 1, and Figure 3 shows the cross section of Figure 1.
A cross section taken along the line ■-■ in the figure is shown. That is, inside each of the walls 2 and 3, the flat cable l is laid so that the cross section is vertically elongated (the long axis l is in the vertical direction), and in the vicinity of the walls 2 and 3, The twisted portion 10 is formed by giving a twist of
is horizontal). Moreover, in the space between the two wall surfaces 6, a curved portion 11 is formed in an upwardly convex shape (mountain shape). Note that the holding tool 5 is disposed at the outer end of the held portion so that the cross section is vertically elongated, and the tear portion 1
0.10 and the curved portion 11 is kept in a free state.

In addition, in the rotation, only one tree was shown for the flat cable l,
It is also possible to lay two pieces of wood parallel to each other, and usually a plurality of pieces are laid like this.

By the way, Figures 1 and 5 show normal conditions, but in the event of an earthquake, for example, as shown in Part 6, the wall surfaces 2.3 are parallel and in opposite directions (left and right) arrow A. Show
vibrates (displaces).

At this time, a portion M including a part of the twisted portion 1o from the holder 5
Because it is easy to bend, it deforms and effectively causes the above vibration (displacement)
absorb.

Further, as shown in FIG. 7, when the wall surfaces 2 and 3 vibrate (displace) relatively up and down as indicated by arrows B and B, the curved portion 11 flexibly responds to this vibration (displacement). It is clearly seen from the figure that it is absorbed.

On the other hand, as shown in FIG. 8, if the wall surfaces 2 and 3 vibrate (displace) toward each other in the direction of the arrow C1C, the upwardly convex curved portion 11 is deformed into a higher mountain shape to absorb this vibration. It is also clear that In addition, the direction opposite to arrow C1C
When vibration (displacement) occurs in the direction of separation, the peaks deform to become lower and absorb this effectively.

It is also preferable to form the curved portion 11 in a downwardly convex valley shape as in another embodiment shown in FIG. It is necessary to set the distance between the protruding tips a little larger.

The total cross-sectional area of the conductor 7 in each hand-shaped cable 1 is 4
The present invention is particularly effective in the case of large-sized cables with a length of 00 ms" or more, and as shown in FIGS. 6, 7, and 8, vibrations (displacement )
can also be effectively absorbed.

Fig. 10 is a plan view showing a comparative example, and as shown in the figure, if the flat cable l is kept standing with its long sleeve l facing up and down, and offset is taken in the horizontal plane. However, the cable rack 4 has the disadvantage that the width W of the cable rack 4 increases significantly and the opening area of the transition portion increases. In contrast, in the present invention, as is clear from FIGS. 5 and 6, the width W of the cable rack 4 can be sufficiently small (equivalent to that of a general installation part), and the opening area of the transition part can be reduced. It has the advantage of being small.

Note that both wall surfaces 2.3 are not limited to buildings, but can also be used in underground areas (bits and tunnels).

Furthermore, it may be preferable to arrange the torsion portion 10 sufficiently deep within the wall surface 2.3 (because similar effects can be obtained). Furthermore, it is also possible to freely arrange the torsion section 10 in the space between the two wall surfaces 6. The wall surfaces 2.degree. 3 may be two wall surfaces such as an entrance corner in the same building.

〔Effect of the invention〕

The present invention has the following significant effects due to the above-described configuration.

■ It is possible to effectively absorb vibrations (displacements) in any direction between the two wall surfaces 2.3, front and back, left and right, and up and down.

(2) This vibration absorption prevents excessive tension from being applied to the flat cable 1 and prevents damage to the insulator 8 and sheath 9.

■ The width W of the cable rack 4 is narrow and sufficient;
The opening area of the transition section is small.

■ Applicable not only above ground but also underground such as pits and tunnels. In particular, the cross-sectional area of conductor 7... is 400
It is effective for large size cables exceeding "as".

[Brief explanation of drawings]

Figure 1 is a side view showing one embodiment of the present invention, Figures 2 and 3 are
The figures are nn and mm sectional views of Fig. 1, Fig. 4 is a perspective view of main parts, Fig. 5 is a plan view, Fig. 6 is a plan view for explaining the operation,
7 and 8 are side views for explaining the operation, and FIG. 9 is a side view of another embodiment. FIG. 10 is a plan view showing a comparative example. DESCRIPTION OF SYMBOLS 1...Flat cable, 2.3...Wall surface, 6...Both wall surface space|interval part, 10...Twisted part, 11...Curved part. Patent applicant: Mitsubishi Cable Industries, Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] 1. A flat cable laying structure laid between walls, in which the cross section of the flat cable is vertically elongated on the inside of each wall, and between the walls. A flat cable laying structure characterized in that the cross section is twisted at 90° so that the cross section is horizontally elongated, and a curved portion is formed in a convex manner upward or downward.