JPS6042687B2 - Earthquake-resistant installation method for horizontally laid power supply lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved installation method for improving seismic performance in horizontal installation sections of bus ducts, cable racks, etc.

Bus ducts and cable racks are used as power supply lines in factories, buildings, etc., and these are generally suspended vertically from ceilings or cables using hanging bolts.

In electrical rooms and factories with high ceilings, the length of suspension bolts is inevitably large, and there is a great danger that they will swing like a pendulum during an earthquake. To counter this, the installation route has been curved to provide resistance to shaking in a certain direction, and diagonal suspension bolts have been added. However, when the straight cable route becomes large, the resistance to bending becomes small and the body seismic effect is often not sufficiently achieved.

Furthermore, in the case of the diagonal hanging bolt system, if the hanging length becomes large, the effect will not be sufficient, and the number of hanging members will increase unnecessarily, which will cause problems in terms of work and appearance. For horizontal installation, the hanging installation method using hanging bolts as described above is the most economical and can provide effective installation, but at present it also has the above-mentioned drawbacks.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to suspend horizontally laid power supply lines effectively (economically) and to ensure a sufficient body vibration effect. Provides a method of installation.

That is, in the installation method of the present invention, the weight of the power supply line is supported by a hanging member placed perpendicularly from the ceiling or the wire, and the steady rest is supported by a tension-resistant wire stretched almost orthogonally to the power supply line. The main focus is

This will be explained below with reference to the drawings.

Figure 1 shows an example of a conventional hanging bolt system, where 1 is a ceiling surface, 2 is a vertical hanging bolt suspended from the ceiling surface, 3 is a horizontal support between the hanging bolts, and 4 is on the support material. This is a power distribution bus duct installed in a suspended system, and if it is subjected to vibration in the direction of the arrow shown in the figure, it will easily swing due to the principle of a pendulum, and stable support cannot be expected.

Figure 2 shows an example of the same suspension bolt method. 5 in a is a diagonal suspension added between the ceiling and the horizontal support material in the previous example, but this also has no effect if the hanging length is too long. In addition to the lack of cables, the congestion on the ceiling surface poses problems in terms of installation work and appearance.

In addition, b is a plan explanatory diagram of an example of a wiring route including a bent route, 6 is a switchboard, 7 is equipment such as a transformer, and between these, a bus duct 4 is routed including a right angle bend, and hanging bolts 2 and horizontal members 3 It is suspended by.

In this case, even if vibration is applied to the bus duct in the right angle direction, the part installed at right angles will work to dampen the movement, so it will not easily shake, but if the length between the bends is large, the It cannot be said to be perfect, as the middle part swings a lot.

FIG. 3 shows an embodiment of the present invention, in which a bus duct route group 4 (supported by hanging bolts 2 at regular intervals from the ceiling 1) laid out using conventional hanging bolts 2 is placed in a space near the bus duct route group 4, and a messenger cable orthogonal to the bus duct is installed. A tension-resistant wire 8 such as a wire (stranded steel wire) is stretched.

One end of the wire is hung on hooks 12 and the like provided on both walls (construction materials), and the other end is fixed to the hook via a turnbuckle 13, and the turnbuckle 13 adjusts the required tension. Two steady rest wires 9 on the left and right are extended from the support member 3 of the bus duct toward this wire, and connected and fixed to the messenger wire with a suitable lamp 10 or the like.

At this time, tension is applied to the left and right steady rest wires to prevent the support member 3 from swinging to the left or right. Note that the steady rest wires must be arranged at necessary intervals (the intervals must be selected so that the length between the steady rest support points does not resonate with seismic waves, etc.).

) and provide a steady rest in the same way as when stretching. According to the present invention, the steady rest is taken from a horizontally stretched wire as described above, but from this point of view, the positional relationship between the wire and the bus duct is not limited to that shown in the example. It may be on the bottom surface, or it may be on the bottom surface. It is not necessarily perpendicular to the trunk, and a somewhat diagonal intersection may be allowed. Also, if routes in each direction are mixed,
Messenger wires (tensile strength wires) are crossed at right angles, allowing them to be stretched in a net shape.

Furthermore, the steady rest from the messenger wire can be wire, steel rods, etc., and the messenger wire should be fixed directly to the bus duct at one point, without providing a steady rest on the left or right side, to prevent it from swinging along the bus duct installation route. The method can be applied to the extent possible. As explained above, the installation method of the present invention is most effective in reducing the weight of power supply lines such as rack wiring that can be used with bus ducts or similar installation methods using hanging members such as vertical hanging bolts. The tension-resistant wire, such as the messenger wire, which is economically and easily supported, and serves only as a steady rest, is laid almost perpendicularly to a nearby location where the steady rest is most effective, so only a small amount is required. By reducing the thickness and tension of the messenger wire, it was possible to prevent steady movement. Moreover, by simply providing fixing points on both walls and pillars, even fairly long spans can be easily installed using a single wire.It is economical and can be used on external walls as well, giving the appearance of a forest standing like traditional hanging bolts (additional diagonal bolts). This is extremely effective as it sweeps away the entire area, and even if there is an obstacle on the way, it can be avoided by allowing some bending.

Particularly in electrical rooms where many power supply lines are installed, it is efficient because many power supply lines can be stabilized with a single messenger wire, and the steady rest can be easily fixed to the messenger wire using clamps. The present invention provides an economical and highly workable method for installing vibration-proof construction for this type of horizontally installed power supply line, since it can be easily added, moved, removed, etc.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of horizontally laid support for a power feed line using a conventional suspension bolt method, Fig. 2 A and b are explanatory diagrams showing an example of conventional seismic countermeasures, and Fig. 3 is an explanatory diagram showing an example of horizontal installation support of a power supply line using a conventional hanging bolt method. An example of the seismic installation status of a laid power supply line is shown, in which a shows a cross-sectional view and b shows a plan view. 1: Ceiling surface, 2: Hanging bolt, 3: Horizontal support material, 4:
Bus duct, 8: Metsenger wire, (stranded steel wire, etc.), 9: Steady rest wire, 10: Clamp fitting, 12
: Hook, 13: Turnbuckle for tension adjustment.

Claims (1)

[Claims] 1 When laying a power supply line such as bus duct track wiring horizontally, the power supply line is supported horizontally by receiving the weight with a hanging member suspended vertically from the ceiling, wire, etc., while tensile strength wire such as stranded steel wire An earthquake-resistant construction method for a horizontally laid power supply line, characterized in that the power supply line is stretched almost orthogonally to the power supply line, and the steady rest of the power supply line is taken from the tension-resistant wire.