JPH0321158Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a long bus duct for vertical installation, which is used by being installed vertically inside a building as a power distribution line or the like in a building.

(Prior Art) As shown in FIGS. 1 to 3, the present applicant previously attached rigid boxes 2 to a plurality of plate-like long insulated conductors 1 arranged in parallel in the longitudinal direction, We have proposed a long bus duct 5 for vertical installation in which rigid parts 3 and flexible parts 4 are alternately present. In this case, each long insulated conductor 1
has a structure in which a plate-like elongated conductor 1A is covered with an insulating layer 1B.

According to such a long bus duct 5 for vertical installation, since it can be folded as shown, the length of the bus duct can be increased, the number of connections can be reduced, and the construction period for installation can be shortened. It has great advantages such as:

By the way, when such a long bus duct 5 for vertical installation is installed vertically, tension is applied to the conductor of each flexible part 4 due to the weight of the lower part. need to be protected from. Already proposed long bus duct for vertical installation 5
In this method, a tension member 6 such as a wire rope or fiber-reinforced plastic wire is attached to a long insulated conductor 1, and the flexible part 4 is protected by fixing it to each rigid box 2 with a fixing fitting 7. .

However, with this method of installing the tension member 6, although the load burden on the tension member 6 decreases as it goes downward, the same diameter is used over the entire length, resulting in high costs. It had some drawbacks.

(Purpose of the invention) An object of the invention is to provide a long bus duct for vertical installation in which a tension member can be attached economically.

(Structure of the invention) In the long bus duct for vertical installation according to the invention, rigid bodies are intermittently installed in the longitudinal direction of a plurality of long insulated conductors installed in parallel, so that rigid parts and flexible parts exist alternately. A tension member is attached to the flexible part, and the tension member is set to have a lower tensile strength than that in the upper part when installed vertically. It is characterized by the fact that

In this way, if the tensile strength of the lower tension member is made smaller than that of the upper one,
Cost reduction can be achieved.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 4 and 5, in the long bus duct 5 for vertical installation of this embodiment, a tension member 6 made of a plurality of thin plates 9 stacked on top of each other is attached to each flexible portion 4. Both ends are fixed to rigid boxes 2 on both sides with fixing bolts 10. As the thin plate 9, for example, a stainless steel plate, an iron plate, or a fiber-reinforced plastic plate is used. The tension members 6 in each flexible section 4 bear less load as the tension members 6 are located on the lower side of the long bus duct 5 for vertical installation. However, the tensile strength is reduced. In other respects, the structure is the same as in FIGS. 1 to 3.

In this case, it is preferable to bend each of the thin plates 9 in advance as shown in FIG. 6, as this will improve the flexibility and also ensure that the distance between the floors of the building is larger than the standard dimension during installation. can also deal with this.

If all metal plates are used as the thin plates 9 constituting the tension member 6, or even if insulating plates are used, if the side that contacts the rigid box 2 is made of metal plates, the tension member 6 can also be used as an earth bonding means. can do.

The tension member 6 may be fixed to the rigid box 2 not only by bolts but also by welding or the like.

(Effects of the invention) As explained above, in the long bus duct for vertical installation according to the invention, the tensile strength of the tension member located at the bottom is smaller than that of the tension member located at the top. The lower the load bearing is, the lower the cost can be used, and the cost can be reduced.

[Brief explanation of the drawing]

Figure 1 is a side view of an example of a long bus duct for vertical installation in a folded state, and Figure 2 is an X-X line in Figure 1.
3 is an end view taken along the Y-Y line in FIG. 1, FIG. 4 is a perspective view of an embodiment of the long bus duct for vertical installation according to the present invention, and FIG. 5 is a rigid body shown in FIG. 4. FIG. 6 is a perspective view showing an example of the thin plate constituting the tension member used in the long bus duct for vertical installation of this embodiment. 1...Long insulated conductor, 1A...Long conductor, 1B
...Insulating layer, 2...Rigid body box, 3...Rigid body part, 4...
... Flexible part, 5 ... Long bus duct for vertical installation, 6
...Tension member, 8... Branch, 9...
Thin plate, 10...Fixing bolt.

Claims (1)

[Scope of utility model registration request] Rigid boxes are intermittently attached in the longitudinal direction of a plurality of long insulated conductors arranged in parallel so that rigid parts and flexible parts exist alternately, and a tension member is attached to the flexible part. A long bus duct for vertical installation, characterized in that, when the tension members are installed vertically, the tensile strength of the tension members at the bottom is set to be smaller than that at the top.