JPS5820528B2 - Cable arrangement structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cable arrangement structure.

As the scale of systems increases, a large number of various cables are used.

At this time, it is important to efficiently arrange the diverse and large number of cables.

I will explain this point below based on the example of a nuclear power plant.

Nuclear power plants take sufficient safety measures, and therefore have a large number of devices and complex control systems.

In the case of concrete construction, first of all, there are various types of field equipment, and there is also a central control room that exchanges various types of information with these various field equipment and is in charge of overall management and operation. .

Information exchange between the field equipment and the central control room is carried out through cables.

The information to be exchanged includes various power sources, currents, various field information from field equipment, and various control operation information.

Therefore, the types and scales of cables are enormous.

Such cable installation work accounts for a large proportion of the power plant construction work.

In order to shorten the cable installation work, a concept has been proposed in which the field equipment and the central control room are not directly connected, but indirectly connected.

That is, the idea is to provide a terminal board between the central control room and field equipment, and to use the terminal board as a cable connection relay point between the central control room and the field equipment.

At this time, the terminal board will be installed in the central control room.

The conventional example, focusing on the relationship between the terminal board and the central control room,
Let's explain using FIGS. 1 to 5.

FIG. 1 is a top view of the central control room.

Inside the central control room 1, there are provided a central control panel 2, a terminal board 3 provided on the wall side of the room, and an operation console 20.

FIG. 2 is a perspective view of the central control room.

A terminal board 3 and a central control board 2 are provided on the floor 5 of the central control room 1.

Further, a cable pit 4 is dug in the floor 5 (for example, concrete), and cables 1-4G are placed in this pit.

FIG. 3 shows a configuration for arranging cables within the pit 4.

One pin 41 has two cable trays 8, 9.
10 and 11 are installed, and the pit 4 is divided into two.

These two trays are roughly divided into two per pit.
System cable arrangement becomes possible.

In addition, in the figure, trays 8 and 9 and trays 10 and 11 are placed in each pit 4 on both sides of the central control room 2.
The reason for dividing the signals depends on the type of cable.

This will be discussed below. The roles of the central control room in a nuclear power plant include recirculation flow control, control rod control, radiation measurement system, safety protection system, etc.

Each of these is addressed by one central control panel.

Moreover, when considering the heavy use level, the system connection line with the outside for these central control panels is several mats or several 1.
There are four levels: 0V, several 100V.

When these four levels of signal cables are inserted and disposed within one tray, there are problems in terms of work efficiency, maintenance and inspection, and safety.

From this point of view, the method of integrating the cables in the four trays described above has been adopted.

Incidentally, one cable itself has several to several dozen lines.

For the above reasons, one central control panel 2 uses four trays 8, 9, 10, and 11.

These trays 8, 9, 10, 11 are divided into A system, B system,
They are called C system and D system cable trays.

FIG. 4 shows the arrangement of the trays, cables, central control board, and terminal board described above.

The above four systems A, B, and C are connected to each central control panel.

Cable D is led out, and the corresponding four systems of trays 8,
9. ILll) is guided and connected to the terminal board 3.

However, such a conventional configuration has problems with the tray structure at the cable crossing point and with work.

Let me explain based on Figure 5.

FIG. 5 shows the tray configuration at the cable crossing point X in FIG.

Figure A is a top view of the cross point
DOwN means lowering the tray.

The front view is a perspective view, the figure C shows a sectional view taken along the line A-A, and the varnish shows a sectional view taken along the line B-B.

As is clear from the figure, at the cross point
Since two trays are installed in parallel on the pit on the path leading up to the point, one of the trays must be raised or lowered at the cross point.

This facilitates the separation of system cables.

As a result, the tray structure becomes special, and each cross point (
The tray had to be moved up and down, making cable installation work difficult, and as a result, it was difficult to set the cable length between the central control board and the terminal board.

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved cable arrangement structure in which pit construction and cable arrangement work can be easily performed on the structure of the portion where pits intersect and the pit branch portion.

The present invention is characterized in that the tray structure at the intersection of cables to be separated is simplified by configuring pits for cable routes on the floor of the central control room to have different depths.

FIG. 6 is a diagram showing an embodiment of the present invention.

As is clear from the figure, in this embodiment, the cable pit 12 is set to have a depth of two levels, and trays 8, 9, 10, and 11 are provided at each level.

FIG. 7 shows the tray configuration at the cross point X.

Figure A shows a top view, figure C shows a perspective view, figure C shows a sectional view taken along line A-A, and figure varnish shows a cross-sectional view taken along line B-B.

As is clear from the figure, at the cross point, it is no longer necessary to raise or lower the tray as in the conventional example.

Figure 8 shows the overall system diagram.

Trays 8, 9° 10.11 result in exactly the same cable wiring structure as before, as shown by the difference in diagonal lines and without the hatching.

According to this embodiment, there is no need to move the cable tray up and down at the cable crossing point, and one tray can pass through the bottom of the other tray as it is, which simplifies the cable tray structure. Since the tray does not move up and down, the installation work is simplified and the cable length between the central control panel and the terminal board can be easily determined.

Furthermore, leak management has become easier. The work order is to first install a terminal board to form a relay point, then place the cables inside the tray, and connect the cables inside the tray to the central control board once the central control board is installed. l Rub.

As a result, as soon as the central control panel is installed on-site,
Cable connection is possible.

Of course, the context may change slightly depending on the situation at the scene.

In this embodiment, a two-stage pit structure is used, but depending on the scale of the plant or system, a pit structure with two or more stages may be used.

Furthermore, this can also be applied to other than atomic couplants.

According to the present invention, the structure of the cable tray to be stored in the cable pit can be simplified, and since there is no upper or lower part of the cable tray, cable installation work can be easily carried out.

[Brief explanation of the drawing]

Figure 1 is a top view of a conventional central control room, Figure 2 is its perspective view, Figure 3 is a pit configuration diagram, Figure 4 is a system configuration diagram, and Figure 5
Figure A 2, C, 2 is a cross point tray configuration diagram, Figure 6 is an embodiment of the present invention, Figure 7 A 2, C, 2 is a cross point tray configuration example diagram, FIG. 8 is a system configuration diagram of the present invention. 1... Central control room, 2... Central control panel, 3... Terminal board, 12... Cable pit, 8, 9, 70. '
l'l...Cable tray.

Claims (1)

[Claims] 1. A cable pit is provided on the floor of the central control room, and a large number of cables of multiple types for connection between the terminal board and the control board in the central control room are guided through the pit. Cable arrangement structure c2, the above-mentioned pit has a structure in which the cables to be arranged are divided into a plurality of parallel sections in order to separate them by type, and each section is formed with a different pit depth. structure.