JP2012249474A - Flat surface type cable way for cable laying - Google Patents

Abstract

Provided is a flat electrical circuit for laying a cable suitable for installing a large amount of cables in a narrow space by installing in an electrical room or the like in which a switchboard / control panel is installed.
An electrical circuit suitable for connecting an electrical cable to a switchboard / control panel installed in an electrical room. A structure in which high-voltage power cables, low-voltage power cables, control measurement cables, etc. are separated and installed on the same surface, and a maintenance management scaffold is built in the same surface as this cable installation surface, so that the height direction A large amount of cable can be laid in a place where there are restrictions, and at the same time, it has the utility as a scaffold for work.
[Selection] Figure 2

Description

  The present invention relates to a flat electric circuit for laying a cable, and more particularly to a flat electric circuit suitable for laying an electric cable wired in an electric room in which a switchboard and a control panel are installed.

  In the electrical room where the switchboard and control panel are installed, there are many cables connected to the switchboard and control panel. There are several types of electrical cables, including high-voltage power cables, low-voltage power cables, and control / measurement cables. It extends to. The wiring path in the electric room into which such an electric cable is introduced is constituted by a cable tray that is suspended and supported by using the lower surface or side surface of the construction material of the electric room, and the distance between the support points in the extending direction is also set. It is set within 2m (Electrical Equipment Standard 187). In general, cables are often installed in ducts and cable trays (also known as cable racks). However, when installing, multiple stages can be installed in the vertical direction for each circuit segment for high pressure, low pressure, and control / measurement. It is done. FIG. 5 shows a partial configuration of a conventional multistage cable tray 1. As shown in the figure, the horizontal beam 3 is provided in multiple stages in the vertical direction on the support column 2, and the side plate 4 is formed along the cable laying direction on the horizontal beam 3 at each stage to form a tray. Normally, the uppermost tray is configured as the high-voltage power cable tray 5, the middle tray is configured as the low-voltage power cable tray 6, and the lower tray is configured as the control / measurement cable tray 7. Such a multistage cable tray 1 is planned to be lower than the beam of the construction material and higher than the switchboard / control panel so as not to hinder the opening / closing of the switchboard / control panel door.

JP 2005-151655 A JP 11-264886 A

  By the way, in order to lay a plurality of types of cables in a multistage cable tray according to type, a height dimension corresponding to the number of tray stages is required. In particular, if the high-voltage / low-voltage power cable of the power system is close to the control / measurement cable, the control / measurement signal is affected, so that it is necessary to lay the cable sufficiently away according to the cable type. Therefore, when there is no space in the ceiling where this type of multi-stage cable tray is installed, there is a problem that the cables cannot be laid even if a large amount of cables are required. Normally, the height of the electrical room is secured in the initial building design stage, but when design changes occur such as lowering the ceiling slab or increasing the vertical dimension of the ceiling beam during construction. Since the installation height space of the multistage cable tray cannot be secured, it becomes a big problem.

  Furthermore, work scaffolds are installed in the electrical room for installation work and maintenance management of equipment such as air conditioning ducts, pipes, and bus ducts installed in the electrical room. This work scaffold may be temporarily installed only during the installation work period, but requires a permanent work space for maintenance management. Since it is also necessary to secure such a permanent installation space for the scaffold, the design change as described above causes a reduction in the installation space for the multistage cable tray.

  The present invention provides a planar electric circuit for cable laying suitable for installing a large number of cables in a narrow space by focusing on the above-mentioned problems and installing in an electrical room or the like where a switchboard / control panel is installed. For the purpose.

  It is another object of the present invention to provide a cable laying planar electric circuit that can be used together with a working scaffold for ceiling equipment such as an air conditioning duct in a cable laying room.

  The present invention is particularly suitable for connecting an electrical cable to a switchboard / control panel installed in an electrical room, and a high-voltage power cable, a low-voltage power cable, a control measurement cable, etc. are separated on the same surface. By constructing it so that it can be installed in the same plane as this cable laying surface and simultaneously installing a scaffold for maintenance management, it is possible to lay a large amount of cable in places where there are restrictions in the height direction, and at the same time work scaffolding It has the usability as.

  The planar electric circuit for cable laying according to the present invention is an upper part of the cable laying room, provided with an intermediate beam forming a flat area in an intermediate height region between the cable connecting device and the ceiling equipment, and the cable is connected to the intermediate beam. The power cable laying route and the control / measurement cable laying route are separated from each other by disposing a separator that separates the cable laying route in the width direction of the extending direction, and the power cable laying route and the control / measurement cable laying route are separated from each other. It is characterized by having a working scaffold placed between the two.

The power cable laying route includes a high-voltage power cable laying route and a low-voltage power cable laying route, and a wire work scaffold can be arranged between both routes.
The cable laying route may be provided with a plurality of cable alignment guides.

  According to the above configuration, even in a ceiling space without a height space, a large amount of cables can be installed in a narrow space, and a work scaffold for ceiling equipment such as an air conditioning duct in a cable laying room is also used. The effect that it is possible can be demonstrated.

  At the same time, it is possible to reduce the amount of electrical circuit material such as a cable tray, reduce the scaffolding material using a common scaffold, and avoid interference with other structures. Further, the cable laying area can be expanded, and the effect of improving the cable laying workability (including the scaffold removal work) and the safety can be obtained.

1 is a schematic cross-sectional configuration diagram of an electric chamber provided with a planar electrical circuit for cable laying according to an embodiment of the present invention. It is a fragmentary perspective view of the planar electric circuit for cable installation concerning the embodiment of the present invention. It is a fragmentary perspective view of the wire guide provided in a cable laying route. It is a top view which shows the cable connection point to a switchboard and a control panel. It is a fragmentary perspective view of the conventional cable rack.

Hereinafter, embodiments of a planar electrical circuit for cable laying according to the present invention will be described in detail with reference to the drawings.
FIGS. 1 and 2 are schematic cross-sectional configuration diagrams of an electric chamber (FIG. 1) showing an arrangement state of the cable laying flat electric circuit according to the embodiment in the electric chamber, and a partial perspective view of the cable laying flat electric circuit (FIG. 1). 2).

  The cable laying planar electric circuit 10 according to the embodiment is installed in an electric chamber 14 in which a plurality of large-sized switchboards / control boards 12 arranged for controlling equipment of plant facilities are accommodated. . In the case of the embodiment, the switchboards / control boards 12 are arranged in two rows (the switchboards / control boards 12A, 12B), and a work passage 16 is formed between the switchboards / control boards 12A, 12B and on the back side. . In addition, equipment equipment such as a bus duct 18 and an air conditioning duct 20 is disposed on the ceiling of the electrical chamber 14 so as not to affect the workability of the electrical chamber 14 with respect to the switchboard / control panel 12.

  A cable for connection to an external power supply facility or plant equipment is introduced into the electrical room 14 and the cable connection is made to the switchboard / control panel 12 installed inside. There are various types of cables, such as a high-voltage power cable 22 of about 6 kV, a low-voltage power cable 24 of about 230 to 440 V, or a control / measurement cable 26 of about 100 V. The

  In order to divide the cables into different types and distribute power to a plurality of switchboards / control panels 12, the switchboard / control panel 12, the bus duct 18 and the air-conditioning duct 20 as the cable connection devices are provided in the upper part of the electrical room 14 which is a cable laying room. The flat electric circuit 10 for cable laying is constructed in an intermediate height region with the ceiling equipment. For this purpose, first, an intermediate beam 28 is provided in the intermediate height region, which is passed over the building side wall to form a planar region. In the embodiment, the intermediate beam 28 is configured by arranging H-shaped steel in parallel in a direction orthogonal to the cable extending direction at a predetermined interval. Since the distance between the intermediate beams 28 is the distance between the cable support points, it may be within 2 m in accordance with the electrical equipment standard. Of course, it is good also as a ladder-like structure by assembling beam members vertically and horizontally in a plane lattice shape. As a result, the basic surface of the cable laying flat electric circuit 10 is constructed.

  A plane region is formed by the intermediate beam 28, and a separator for separating and arranging at least the power cable installation route and the control / measurement cable installation route is attached to the upper surface portion. In the embodiment, the separator includes a pair of high-pressure separation separators 30A that divide the laying route 32 of the high-voltage power cable 22, a separator 30B that divides the laying route 34 of the low-voltage power cable 24, and an laying route 36 of the control / measurement cable 26. And a separator 30C. A pair of these is provided to partition both sides of the laying routes 32, 34, and 36 from the other. The height of the separators 30 (30A, 30B, 30C) may be set according to the bulkiness of the cables to be installed. In the case of the embodiment, the separation guide plates 38 of the separators 30 are arranged at predetermined intervals along the cable extending direction. It is attached to the top plate. As the separator material, H-shaped steel, L-shaped steel, box-shaped steel, iron plate, or the like can be used as appropriate. Such a separator 30 is fixed to the intermediate beam 28 by bolting or welding or the like, and is supported at the same time by hanging from a ceiling construction material using a hanging tool 40, and is configured not to bend due to the cable weight. Yes.

  3 is provided on the upper surface of the intermediate beam 28 serving as the floor surface of the high-voltage power cable laying route 32 so that the cables to be laid are not entangled with each other. This is a U-shaped steel welded at intervals, and the high-voltage power cable 22 is aligned by passing the cable strand between the U-shaped steel groove and the U-shaped steel. The wire guide 42 can be applied to other cable laying routes.

  By the way, as described above, the cable laying routes 32, 34, and 36 are formed. However, the routes are not directly adjacent to each other, but a certain width space is provided between the routes, and a working space is provided here. Scaffolds are arranged and configured.

  First, in order to prevent the control / measurement cable 26 from adding noise to the control signal or measurement signal due to electromagnetic waves from the high / low pressure power cables 22, 24, the arrangement order of the routes is the same as that of the high voltage power cable 22. The high-voltage power cable laying route 32, the low-voltage power cable laying route 34, and the control / measurement cable laying route 36 are arranged in this order so that the measurement cable 26 has the maximum separation distance. The distance between the low-voltage power cable laying route 34 and the control / measurement cable laying route 36 is set larger than the distance between the cable laying route 34 and the cable laying route 34. In this embodiment, since the electric chamber 14 is provided with two rows of switchboards / control boards 12A, 12B, the cable group connected to the one row of switchboards / control boards 12A is connected to the center between them. From one side wall of the electrical chamber 14 toward the work passage, the high-voltage power cable laying route 32, the low-voltage power cable laying route 34, and the control / measurement cable laying route 36 are arranged in this order and connected to the other switchboard / control panel 12B. Are arranged so as to be a control / measurement cable routing route 36, a low-voltage power cable routing route 34, and a high-voltage power cable routing route 32 from the central work passage toward the other electric chamber side wall. As a result, the control / measurement cable 26 is extended on the central work passage, and the high-voltage power cable 22 is extended on the wall of the electric chamber 14.

  A working scaffold is constructed between the respective laying routes, and in particular, a wirework working scaffold 44 is provided between the high-voltage power cable laying route 32 and the low-voltage power cable laying route 34. It has been. The wire work scaffold 44 may be a building work scaffold plate made of a punching metal material or the like. A cable wire 46 is installed adjacent to the wire work scaffold 44, particularly on the high voltage power cable laying route 32 side, and used for cable laying work.

  In addition, a space 48 between the low-voltage power cable laying route 34 and the control / measurement cable laying route 36 is used to provide a maintenance work scaffold 48 for ceiling equipment such as an air conditioning duct. This scaffold may also be made of the same material as the wire drawing work scaffold 44. By providing this maintenance management work scaffold 48, the circuit between the control / measurement cable 26 and the power cables 22 and 24 can be electrically divided, and at the same time, the installation work of the ceiling equipment in the electric room 14, It can be applied to maintenance management work.

  According to the flat cable circuit 10 for cable laying configured in this way, even when the height space for installing the multi-stage cable tray cannot be secured, the circuit division can be performed on a plane. In addition, since the laying separator is installed so that the laying routes of the high and low pressure power cables do not cross each other, the cable can be easily routed. FIG. 4 is a plan view showing the procedure for cable connection to the switchboard / control panel. The cable is routed from the outside of the extended cable to the lower switchboard / control panel 12 through the connection opening 50 in order. Can be easily established.

  In addition, what is necessary is just to install the three-dimensional intersection of the installation path | route for crossing a different circuit division, when connecting to the switchboard / control panel 12. FIG. Moreover, in the said embodiment, although it was set as the structure which installs the cable wire drawing device 46 in the scaffold 44 for wire drawing work, you may make it install the mounting stand for the power wire drawing apparatus of a cable separately.

  INDUSTRIAL APPLICABILITY The present invention can constitute an electric circuit suitable for routing a cable introduced into a plant electrical room on a switchboard / control panel.

10: Planar cable for cable laying, 12A, 12B ... Switchboard / control panel, 14: Electric room, 16: Work passage, 18: Bus duct, 20: Air conditioning duct, 22 ......... High-voltage power cable, 24 ......... Low-voltage power cable, 26 ......... Control and measurement cable, 28 ......... Intermediate beam, 30A ......... High-pressure separation separator, 30B ......... Low-pressure separation separator, 30C ... Control / measurement separation separator, 32 ......... High-voltage power cable installation route, 34 ......... Low-voltage power cable installation route, 36 ... Control / measurement cable installation route, 38 ......... Separation guide plate, 40 ......... Suspension tool, 42 ......... Wire alignment guide, 44 ......... Stand for wire drawing work, 46 ......... Cable wire drawing device, 48 ......... Stage for maintenance work, 50 ......... Mouth opening.

Claims (3)

In the upper part of the cable laying room, an intermediate beam forming a plane region is provided in the intermediate height region between the cable connection device and the ceiling equipment,
At least the power cable laying route and the control / measurement cable laying route are separately arranged by arranging a separator for separating the cable laying route in the width direction of the cable extension direction in the intermediate beam,
A work scaffold is disposed between the power cable laying route and the control / measurement cable laying route.
A planar electric circuit for laying cables. In the planar electric circuit for cable laying according to claim 1,
The electric cable laying route is composed of a high-voltage power cable laying route and a low-voltage power cable laying route, and an extension work scaffold is disposed between the two routes. In the planar electric circuit for cable laying according to claim 1,
The cable laying route is provided with a cable laying guide for the cable to be laid, and a flat electric circuit for laying the cable.

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