JPS5933868B2 - Stand-up and fall equipment for nuclear power plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an up-and-down device, and in particular to a long heavy equipment such as a maintenance cask (hereinafter simply referred to as maintenance It's called a cask.

) is related to an up-and-down device used for up-and-down (up-and-down) by a swing-type overhead crane.

The up-and-down device carrying the maintenance cask is placed parallel to the girder of the slewing overhead crane.

In other words, if the maintenance cask can be arranged radially with respect to the center of rotation of the crane, the maintenance cask can be moved with only two crane operations: hoisting the rope and moving the trolley on the crane girder. You can stand up and fall down using the stand up and fall device.

However, since the maintenance cask is a heavy object, it is necessary to place an up-and-down device on the soil of the building beam of the floor in order to withstand the load of the floor.

However, due to the structure of the reactor vessel, it is difficult to arrange the upright and overturn devices in the radial manner and on the building beams.
It is extremely difficult.

For this reason, if it is not possible to arrange the upright and overturn devices radially, the rope can be continuously hoisted by repeating the operations of slightly turning the crane girder and then slightly moving the traveling trolley. This requires complicated and time-consuming crane operations, and improvements in this respect have been requested.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an up-and-down device for a nuclear power plant that does not require the above-mentioned complicated crane operations that require skill and time.

In order to achieve this object, the present invention enables the pedestal of the up-and-down device, which serves as a rotation fulcrum of the maintenance cask, to be pivotable.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the up-and-down apparatus for nuclear power plants according to the present invention will be described below with reference to the drawings.

In FIG. 1, a reactor containment vessel 1 of a nuclear power plant has a dome shape, and a nuclear reactor 2 and an upper core mechanism 3 are housed in the lower part of the containment vessel 1.

The floor 4 above is supported by building beams 5 and 6 that are perpendicular to each other.

An up-and-down device 8 on which the maintenance cask 7 is placed is
It is arranged on the floor 40 along the building beam 5.

This maintenance cask 7 and the up-and-down device 8 are installed in a second
This will be explained in detail with reference to FIG.

In the figure, the maintenance cask 7 has trunnions 7b, 7b that protrude left and right from one end 7a, and hanging parts 7d, 7d that protrude left and right near the head 7C at the other end.
Equipped with.

The standing and falling device 8 includes a base 80, a rotating pedestal 81, and a fixed pedestal 82.

This pivot pedestal 81 is connected to the base 80 by bearings 83 and 84.
It is supported so as to be pivotable in the direction of arrow A in FIG.

The rotating pedestal 81 also supports the trunnions 7b, 7b of the maintenance cask 7.

That is, the turning pedestal 81 serves as a rotational fulcrum for the maintenance cask 7.

In this way, the maintenance cask 7 is rotatable in the direction of arrow B about the rotation cradle 81 as shown in FIG. 2, and also in the direction of arrow C in FIG. 3.

The fixed pedestal 82 is fixed to the base 80 , and fixing metal fittings 85 are provided at the four corners of the base 80 that supports the main body of the maintenance cask 7 to fix the base 80 to the floor 4 .

Further, hanging ears 86 are fixedly provided at the four corners of the base 80 in order to lift and move the upright/fall down device 8.

Referring again to FIG. 1, the maintenance cart 9 travels between the reactor containment vessel 1 and a maintenance building (not shown).

A traveling rail holding stand 10 protrudes along the circumference from a side wall of the reactor containment vessel 1 near the ceiling.

A running rail 11 is laid on this holding stand 10.

The girder 12 of the swivel overhead crane can swivel around the running rail 11.

A crane traveling truck 13 is placed on this girder 12, and this crane traveling truck 13 is connected to the hook 1 via a rope 14.
5 is hanging.

A rope 16 is hung between the hook 15 and the hanging portion 7a of the maintenance cask 7.

Next, the operation of standing up and falling down the maintenance cask will be explained.

Now, as shown in FIG. 4, the up-and-down device 8 on which the maintenance cask 7 is placed is arranged along the building beam 5, and the traveling truck 13 of the swivel overhead crane is mounted on the suspension part 7d of the maintenance cask 7. Suppose you are directly above it.

Conventionally, the following operations were required to raise and overturn the cask 7.

In other words, in the conventional upright/overturn device, the pedestal, which is the rotational fulcrum of the cask, could not be rotated, so the crane girder 12 was slightly rotated in the load direction, and then the crane traveling carriage 1 was rotated.
The rope 14 was wound up while repeating the operation of moving 3 slightly toward the center of 12 over and over again.

In this way, the traveling carriage 13 is brought directly above the cradle which is the rotational fulcrum by complicated lane operations, and the maintenance cask 7 is caused to stand up and fall.

However, in the present invention, the beam 12 has its turning center 0.
When the girder 12 is rotated in the hour direction from the position shown in FIG. As the girder 12 turns, it turns in the same direction and becomes parallel to the girder 12 as shown in FIG.

Therefore, by subsequently moving the traveling carriage 13 to a position directly above the turning pedestal 81, the maintenance cask 7 can be caused to stand up and fall over.

Of course, when the girder 12 turns or the traveling carriage 13 travels, it is necessary to raise and lower the hook 15 accordingly.

As is clear from the above description, according to the present invention, crane operation is facilitated and working time can be shortened.

Furthermore, since the up-and-down device can be placed at any position on the building beam, it is easier to arrange the floor within the reactor containment vessel.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a nuclear reactor, Fig. 2 is a plan view of an embodiment of the upright/overturn device of the present invention, Fig. 3 is a front view of the above embodiment, and Fig. 4 is a diagram showing the crane and the upstand/overturn device. The first one showing the relationship of
FIG. 5 is a plan view showing the relationship between the up-and-down device and the maintenance cask during crane operation. 7...Maintenance cask (long heavy equipment), 8...Rise and fall device, 81...Swivel cradle, 82...Fixed cradle.

Claims (1)

[Claims] 1. In the up-and-down device for nuclear power plants used for up-and-down long heavy equipment using a slewing crane,
The stand-up and fall device is characterized in that the pedestal serving as the rotation fulcrum of the long heavy equipment is rotatable.