JP3381959B2 - Opening / closing device for manhole cover in double container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for easily opening and closing a manhole cover of an inner container arranged in a narrow space in a double container having an inner container housed in an outer case, and more particularly to nuclear power generation. The present invention relates to a switchgear suitable for a moisture separation heater used in a plant.

[0002]

2. Description of the Related Art Combined wet sentence separation heaters have been adopted for the purpose of improving the efficiency of nuclear power plants and compacting the layout inside buildings.

Typical prior art BWRs are shown in FIGS. 7 and 8.
The structural example of the moisture separation heater for plants is shown. That is,
This moisture separation heater consists of the moisture separation element 1, the first stage
It is composed of a heater 2 and a second stage heater 3. heating
The vessels 2 and 3 consist of heater headers 4,5 which are inner containers and tube bundles 6 and 7, all of which are housed in an outer barrel 8 which serves as an outer container. The outer case 8 has a diameter as small as possible in order to make the building compact. The heater <br/> header 4 and 5, during periodic inspection, so that it is possible to perform the inspection of the mounting portion of the heater header and the tube bundle 6, manhole 9 and 10 are provided on both sides, outside Torso manhole 1
It is designed so that the manhole covers 13 and 14 can be opened and closed from 1 and 12, respectively.

[0004] Manhole cover 13 and 14 because the heater header <br/> da 4,5 a high pressure steam at about 200 to 40
The weight is 0 kg. As a method of opening and closing the manhole covers 13 and 14 of this heavy object, conventionally, there is a method of removing the mounting bolts by receiving the weight of the manhole cover by a chain block, and then lowering it. In addition, Mitsubishi Heavy Industries Technical Report Vol. As shown in 19 No. 6 (issued in November 1982), the heater header has a structure protruding from the outer barrel opening.

As related to the prior art, there are those disclosed in JP-A-59-84786 and JP-A-63-14929.

[0006]

By the way, in the prior art using the chain block, it is necessary to secure a space for mounting the chain block between the manholes of the heater headers 4 and 5 and the manholes 11 and 12 of the outer case 8. However, in such a case, since the outer case 8 has to be increased in size, the outer case 8 cannot be made compact, and moreover, the work for suspending it by the chain block is troublesome. Also, in the conventional technique in which a part of the heater header is projected from the opening of the outer shell, the outer shell is increased in size, and thus it is difficult to make it compact. Therefore, the above-mentioned conventional technique has a problem in that it is difficult to consider the ease of opening and closing the manhole cover of the inner container and the avoidance of increasing the outer diameter of the outer container.

An object of the present invention is to provide a manhole in a double container in which the manhole cover can be easily opened and closed even in a small space, so that the opening and closing work can be saved and the size of the outer container can be prevented. An object is to provide a cover opening / closing device.

[0008]

In the manhole cover opening / closing device of the present invention, a pedestal mounted with rolling bearings is attached to the lower portion of the manhole cover, and a guide plate is attached to the upper portion of the manhole cover. A rail for rolling and guiding the rolling bearing of the pedestal is attached to the lower portion of the inner container, and a guide rail for guiding the guide plate is attached to the upper portion of the inner container in parallel with the rail. In addition, the pedestal of the manhole cover and rail
The position of the manhole cover in the height direction between
Adjustment means and mounting bolts for the manhole cover
Almost axial with respect to the manhole when removed
Slide the manhole cover along the
Of the manhole cover that creates a gap between the manhole and the manhole
A shift means is provided. The manhole cover is opened and closed with respect to the manhole by moving the guide plate of the manhole cover along the guide rail and the rolling bearing along the rail.

Further, the pedestal on which the rolling bearing is mounted is detachably attached to the lower portion of the manhole cover.

[0010]

In the present invention, as described above, the pedestal having the rolling bearing mounted on the manhole cover and the guide plate are attached, the rail and the guide rail are attached to the inner container, and the guide plate of the manhole cover is installed along the guide rail. The manhole cover is opened and closed by moving the rolling bearing of the pedestal along the rail.
Even if the manhole cover is a heavy object or is placed in a small space, it can be easily opened and closed without requiring a forceful work such as lifting.

In particular, when the pedestal has a rolling bearing, the self-weight of the manhole is transmitted to the rail through the rolling bearing, so the force F for moving the manhole cover is the weight of the manhole cover. If W and the friction coefficient of the rolling bearing are μ, then F = W × μ. here,
The coefficient of friction of rolling bearings is about 0.1, so
When the weight of the manhole cover is 200 to 400 kg, F becomes about 20 to 40 kg, and this is the opening and closing force of the manhole cover, so that one operator can open and close it sufficiently. Therefore, since the manhole cover can be easily opened and closed, it is possible to avoid increasing the size of the external container.

Further, since the pedestal is detachably attached to the manhole cover, if the pedestal is removed except during the periodic inspection, the lubrication performance of the roller bearing is prevented from being deteriorated by the influence of the internal steam. be able to.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The double container of the embodiment is applied to a moisture separation heater used in a nuclear power plant,
A first-stage heater header 4 and a second-stage heater header 5 as internal containers are built in the outer case 8 (see FIGS. 7 and 8).
), And as shown in FIG. 1, each heater header 4,
5 manholes 9 and 10 with manhole covers 13 and 14
Are attached by mounting bolts 26. This point is similar to the conventional technique. The manhole cover 1
A handle 27 is attached to each of 3, 14.

The double container has an opening / closing device for opening and closing the manhole covers 13 and 14, respectively. This switchgear includes a first-stage heater header 4 and a first-stage heater header .
Manhole covers 13, 1 of the two-stage heater header 5
Although it is used for opening and closing 4, the second stage heater header 5 will be described below for convenience.

That is, as shown in FIGS. 2 to 4, the opening / closing device has support bases 15 on both sides of a lower portion of the manhole cover 14.
Are respectively attached by bolts, and the respective support bases 15
The pedestal 19 is attached to the mounting base 20 via mounting bolts 20. The pedestal 19 is, as shown in FIGS. 3 and 4, a rail 1 described later.
A rolling bearing 18 is attached to the lower part in order to roll over the upper part 7. Further, the pedestal 19 has an adjusting bolt 21 whose tip portion is planted in the supporting table 15, and by rotating the adjusting bolt 21, the vertical position of the receiving table 19 on the supporting table 15 can be adjusted. There is.

On the other hand, a rail 17 is attached to the lower part of the second stage heater header 5 via a rail support plate 16, and the second
A guide rail 22 is attached to the upper part of the stage heater header 5. The rail 17 guides the support base 15 by rolling of the rolling bearing 18 of the support base 15 on the rail 17, and stoppers 25 are provided at both ends of the rail 17 to prevent the support base 19 from coming off. There is. The guide rail 22 has a groove 22a on the tip side, and a guide plate 23 held on the upper portion of the manhole cover 14 is engaged with the groove 22a. As shown in FIGS. 2, 5 and 6, the guide plate 23 is fixed to the manhole cover 14 by holding members 28 which are screwed to both upper sides of the manhole cover 14.
4 has a ridge portion 23a which is held on the upper portion thereof and which can be engaged with the concave groove 22a at the tip of the upper portion.

Further, first and second floating bolts 24A and 24B are mounted at the upper and lower positions of the manhole cover 14. That is, as shown in FIGS. 5 and 6, the first floating bolt 24A has a tip portion that passes through the support bracket 29 of the manhole cover 14 and is screwed into a nut 30 provided on the guide plate 23. Floating bolt 24A
As shown in FIGS. 3 and 4, the is mounted at a position corresponding to the rail 17 under the pedestal 19. Then, when the mounting bolt 26 of the manhole cover 14 is removed, the first floating bolt 24A is tightened to shift the guide plate 23 in the direction of the arrow shown in FIG. 6, and the second floating bolt 24B is also tightened. Floating bolt 24B
4 presses the side portion of the rail 17 and the pedestal 19 shifts in the direction of the arrow shown in FIG. 4 together with the manhole cover 14, so that the manhole cover 14 is separated from the manhole 10 by an appropriate distance.

In the opening / closing device, when the pedestal 19 is mounted on the lower part of the manhole cover 14 so as to be mounted on the rail 17, and the guide plate 23 is arranged on the upper part thereof, the mounting bolt 26 of the manhole cover 14 is mounted on the manhole cover. After being removed from 10, the manhole cover 14 is moved along the rails 17 and the guide rails 22 to open and close the manhole cover 14.

Next, a procedure for opening and closing the manhole cover 14 using the opening / closing device will be described.

First, when the manhole cover 14 is attached to the manhole 10 by the attachment bolts 26 (closed state), the receiving table 19 is inserted between the supporting table 15 of the manhole cover 14 and the rail 17. At this time, if the pedestal 19 is inserted from the end of the rail 17, the pedestal 19 can be easily inserted. Then, after inserting the cradle 19 between the manhole cover 14 and the rail 17, since the manhole cover 14, not to be dropped downward to come and loosened the mounting bolts 26 of the manhole cover 14, receiving The adjusting bolt 21 of the base 19 is turned to adjust the position of the receiving base 19 in the height direction between the supporting base 15 and the rail 17, and then the mounting bolt 20 is tightened to fix the receiving base 19 to the supporting base 15.

Next, the mounting bolts 26 of the manhole cover 14 are removed, and then the first floating bolts 24A and the second floating bolts 24B on the upper and lower parts of the manhole cover are removed.
By turning and, the manhole cover 14 as a whole is displaced together with the pedestal 19 in the direction of the arrow as shown in FIGS. 4 and 5, and a gap is formed between the manhole cover 14 and the manhole 10. Make sure there is no risk of scratches. Then, when the handle 27 of the manhole cover 14 is gripped and moved along the rail 17 and the guide rail 22, the manhole cover 14 moves from the position of the manhole 10 and opens. Moving this case, the manhole 17 is rolling bearing 18 of the cradle 19 in the lower is guided by the rails 17, the guide plate 23 at the top is guided by the guide rails 22, losses Re Ruosore completely without smoothly can do. Thereby, the heater headers 4 and 5 can be inspected.

The manhole cover 14 still open
By performing the above procedure in the reverse order, the manhole cover 14 can be attached to the manhole. At this time, after the manhole cover 14 is closed, the pedestal 19 is removed from the manhole cover 14.

Therefore, when the rolling bearing 18 of the pedestal 19 is guided by the rail 17 and the guide plate 23 is guided by the guide rail 22 to move linearly, the manhole cover 14 can be opened and closed. Even if it is an object or it is placed in a small space, it can be easily opened and closed without requiring a forceful work such as lifting.

If the pedestal 19 is removed from the manhole cover 14 after the manhole cover 14 is closed, the lubrication performance of the rolling bearing 18 mounted on the pedestal 19 is prevented from being deteriorated by the influence of internal steam. Therefore, the performance of the rolling bearing 18 can be maintained. Further, the pedestal 19 has an adjustment bolt 21, and the adjustment bolt 21 allows the support 15
Since the position of the pedestal 19 in the height direction between the rail 17 and the rail 17 can be accurately positioned, even if the mounting bolt 26 is removed from the manhole cover 14, the manhole cover 14 can be removed.
Does not drop, so that the pedestal 19 can be properly attached. However also floated bolt 24 also has, when separating the manhole cover 14 by turning work該浮However bolt 24 from a manhole 10, when followed by moving the manhole cover 14, the is no risk of damaging the flange surface or a gasket Not only that, the manhole cover 14 can be easily displaced.

Since the mounting of the pedestal 19 and the opening / closing operation of the manhole cover 14 can be performed from one direction which is the manhole side of the outer case 8, the worker does not have to move around one by one and the workability is extremely good.

In the illustrated embodiment, an example in which the opening / closing device is applied to the moisture separator / heater is shown, but the present invention is not limited to this, and it is applied to a manhole cover which is opened and closed from one direction. be able to.

Another embodiment of the present invention will be described with reference to FIGS. 9 and 10. Note that FIG. 10 shows a cross-sectional view of the GG portion in FIG.

In this embodiment, the width of the groove of the guide rail 22 for guiding the convex guide plate 23 mounted on the upper portion of the manhole cover 14 is widened at the tightening portion of the manhole cover 14 and narrowed at the slide portion to be opened. ing.

When the manhole cover 14 is opened, the pedestal 19 is attached and fixed to the lower side of the manhole cover 14 and the floating bolts 24 are used to open a gap between the manhole cover 14 and the manhole 10. , And slide the manhole cover 14 laterally so as to protect the flange surface.

Regarding the upper side of the manhole cover 14,
In the above-described embodiment, the floating bolts 24 are used as in the lower side.
While the flange surface is protected when it slides in the lateral direction, in this embodiment, the flange surface is protected by separating the groove of the guide rail 23 in the sliding portion from the flange surface.

That is, the guide rail 23 for guiding the convex guide plate mounted on the upper portion of the manhole cover 14.
Of the guide plate 23 is wide at the tightening portion of the manhole cover 14, and at the slide portion away from the flange surface.
The manhole cover 14 is reliably separated from the flange surface when it is slid, because the manhole cover 14 is narrowed to fit the width of the flange.

As described above, in this embodiment, since the guide plate 23 is fixed to the upper portion of the manhole cover 14, the floating bolt 24 can be operated only by the lower pedestal 19 and the workability is improved. To be done.

[0034]

As described above, according to the first aspect of the present invention, the guide plate attached to the manhole cover and the rolling bearing of the pedestal are moved along the guide rail and the rail, thereby removing the manhole cover. since it is configured to open and close, even within narrow spaces, FIG Rukoto result, the size avoidance of labor saving and the outer container closing operations can be easily performed without lifting the operator to open and close the manhole cover You can In addition, the adjustment means
Since the position of the table in the height direction can be accurately positioned,
Even if the mounting bolts for the hole cover are removed, the manhole
The cover will not drop. Also, as a shifting means
More manhole cover from manhole at appropriate distance
As they can be separated, the flange surface or gasket
There is no risk of scratching the door. Further , according to claim 2, since the lubrication performance of the rolling bearing of the pedestal can be prevented from being deteriorated by removing the pedestal, the function of the rolling bearing can be maintained even when applied to the moisture separation heater. You can do it .
Furthermore, the position of the pedestal in the height direction can be accurately adjusted by adjusting means.
Since it can be positioned, the mounting bolt for the manhole cover
Even if you remove it, the manhole cover will not drop
Become. In addition, the manhole cover can be
Since it can be separated from the hole by an appropriate distance,
No risk of scratching the flange surface or gasket
Become. Further, according to claim 3, the manhole cover open
When closing, the ridges attached to the top of the guide plate
Guide the guide plate by engaging it with the groove of the guide rail.
So the manhole cover will not fall over and will be smooth
The effect is that you can move .

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts showing an embodiment of a manhole cover opening / closing device according to the present invention.

FIG. 2A of FIG. 1 showing the entire manhole cover opening / closing device
FIG.

FIG. 3 is a detailed view of part B in FIG. 2 showing a pedestal and its surroundings.

FIG. 4 is a DD sectional view of FIG. 3 showing the pedestal and its periphery.

5 is a detailed view of a portion C in FIG.

6 is an explanatory view corresponding to the arrow E in FIG.

FIG. 7 is a cross-sectional view showing a moisture separator / heater to which a conventional double container is applied.

8 is a cross-sectional view taken along the line FF of FIG.

FIG. 9 is a view showing a manhole cover opening / closing device according to another embodiment of the present invention.

10 is a cross-sectional view taken along line GG of FIG.

[Explanation of symbols]

1 ... Outer shell, 4, 5 ... Heater header as inner container,
10, 11 ... Manhole, 13, 14 ... Manhole cover, 17 ... Rail, 18 ... Rolling bearing, 19 ... Cradle,
22 ... Guide rail, 23 ... Guide plate.

─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Yamaguchi 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Akira Okabe 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi, Ltd. Hitachi factory (72) Inventor Katsuya Oi 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa (72) In-house Toshiba Keihin Office (72) Inventor Koichi Yoshimura Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa 2-4, Toshiba Keihin Works (72) Inventor Masayoshi Takahashi 2-4, Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Toshiba Keihin Works (56) Reference JP-A-2-191186 (JP) , A) JP 59-194169 (JP, A) JP 63-67290 (JP, A) Actually open 2-120395 (JP, U) Actually open 61-163097 (JP U) (58) investigated the field (Int.Cl. ^7, DB name) B65D 90/10 E02D 29/14

Claims (3)

(57) [Claims] 1. A double container in which an inner container having a manhole cover on a vertical surface inside an outer container is built-in, a pedestal equipped with a rolling bearing is attached to a lower part of the manhole cover, and a guide is provided on an upper part of the manhole cover. mounting the plate, the rolling bearing of the cradle to the bottom of the inner container with attaching the rolling guide rail, mounting the guide rails of the guide plate engages the top of the inner container in parallel with the rail, the cradle Between the manhole cover and the rail
Adjusting the height position of the manhole cover in the
Remove the adjusting bolts and the mounting bolts for the manhole cover.
The manhole, the
Slide the manhole cover, and
The manhole cover shifts to create a gap between the manhole cover
An opening / closing device for a manhole cover in a double container, characterized in that the manhole cover is opened and closed with respect to the manhole by providing guide means of the manhole cover along a guide rail and a rolling bearing along the rail. 2. In a double container having an inner container having a manhole cover on a vertical surface inside the outer container, a pedestal equipped with a rolling bearing is detachably attached to a lower part of the manhole cover and the manhole cover attaching a guide plate to the upper, the rolling bearing of the cradle to the bottom of the inner vessel with attached rail rolling guides, attaching the guide rail to the guide plate engages the top of the container interior parallel to the rail, the Manhole cover and tray on the cradle
Position of the manhole cover in the height direction between
Adjusting means for adjustment, and mounting button for manhole cover
When the rut is in the detached state,
Move the manhole cover along the axial direction to
Manhole cover that creates a gap between the cover and the manhole
Opening and closing of the manhole cover in a double container characterized by providing bar shifting means, moving the guide plate of the manhole cover along the guide rail and the rolling bearing along the rail, and opening and closing the manhole cover with respect to the manhole apparatus. 3. A groove is provided on the tip side of the guide rail,
Guide plate opening and closing device of the manhole cover in the double container according to this <br/> and provided with ridges the that match the engagement groove at the top to claim 1 or 2, characterized in.