JP3053547B2 - How to install heavy objects in the PCV - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a heavy object, particularly a steam generator, in a containment vessel of a pressurized water nuclear power plant, and further relates to a method suitable for subsequent inspection and repair.

[0002]

2. Description of the Related Art Generally, a polar crane is provided in a containment vessel of this kind, and a permanent trolley for repair is mounted on the polar crane. Permanent trolleys have the minimum required capacity for inspection and repair (for example, those with a lifting capacity of 200 tons or less). For this reason, when installing a heavy object exceeding the capacity of the permanent trolley, particularly a steam generator, in the containment vessel, it is necessary to have a lifting capacity of about 400 tons, so special measures are taken.

One example is shown in FIGS. 4 and 5. FIG. FIG. 4 is a diagram showing a state of the steam generator carried into the containment vessel,
FIG. 5 is a diagram showing a state in which the steam generator is raised. In FIG. 4, a lifting device 3 a of a permanent trolley 3 mounted on a polar crane girder 2 a of a polar crane 2 disposed in the upper part of the containment vessel 1 is used to suspend the steam generator 4. Insufficient lifting capacity.

To remedy the shortage, a permanent trolley 3
On top of this, a lifting device 3b of the same type as the lifting device 3a of the permanent trolley 3 is added, and the two are linked to utilize the lifting of one hook 5. Here, the horizontally disposed steam generator 4 carried by the cart 6 into the containment vessel 1
Is hung by the hanger 7 of the permanent trolley 3 and raised in a horizontal state. 8 is a trunnion. The trunnion 8 may not be used.

Next, the bogie 6 is moved out of the system, and as shown in FIG. 5, the polar crane 2 is turned, and the permanent trolley 3 is traversed, and the lower part of the steam generator 4 is placed on the reversing ring 10a of the reversing device 10. Fix it. Thereafter, the permanent trolley 3 is lifted while traversing in the direction of the arrow, and the steam generator 4 is raised.

[0006] Then, the steam generator 4 is taken just above a fixed position, suspended, and installed as shown by a dashed line. 9 is a work floor. In the above, the lifting device 3b
The example in which the shortage of the lift was compensated for by adding more was explained, but in addition, the lift may be insufficient. If the lift is insufficient, it is difficult to raise the steam generator 4. Therefore, a temporary stand (not shown) is generally installed on the polar crane girder 2a, and the lifting devices 3a and 3b are mounted on the temporary stand to lift the head. Is raised.

[0007] In the conventional method, when additional installation due to insufficient lifting, it is necessary to change the crane such as wiring and hooks, and the work is complicated and man-hours are required. In addition, they are dangerous because they involve working at heights. When the head for raising the steam generator 4 is insufficient, it is necessary to raise the so-called height.

[0008] As a countermeasure for the above shortage of head, Japanese Patent Publication No. 5-6
Japanese Patent Application Laid-Open No. 6997 (hereinafter referred to as prior art) discloses a technique. Here, a sheave receiving beam is provided on a polar crane girder in a containment vessel to suspend a lifting bracket (corresponding to a reversing ring), and a horizontal beam carried into the containment vessel by the hanging beam of the polar crane and the lifting bracket. The upper and lower portions of the steam generator in the state are hung, and the steam generator is raised and installed by the hanging beam and the lifting hardware.

[0009]

However, the prior art is expected to have a certain effect in solving the shortage of the head, but has the following problems. In the prior art, as shown in the embodiment, when a steam generator is hung by a lifting bracket, a pulling wire rope pulled out from a winch installed on the ground outside the containment is used as a pulley and a sheave support. And suspended on the pulley on the lifting bracket through the sheave, and the lifting bracket is suspended from the sheave receiving beam. Therefore, it takes more time than necessary to thoroughly communicate the operation inside and outside the container, and the operation is complicated.

[0010] On the other hand, after the steam generator is installed in the containment vessel, inspection and repair are usually performed only. Therefore, the additional lifting device 3b and the like are removed and replaced with a permanent trolley for repair. You. It takes time to add and remove the lifting device 3b, and during that time, there is a problem that the crane cannot be used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is easy to install a heavy object, particularly a steam generator, and to add an apparatus for increasing the lifting capacity.
It is another object of the present invention to provide a method for installing a heavy object in a containment container that is easy to remove.

[0012]

According to the present invention, a working trolley and a repairing permanent trolley are provided so as to be able to traverse on a polar crane garter in a storage container, and the working trolley has a fixed drum thereon. Guide rollers for wire handling,
A wire jack equipped with a wire winder equipped with a plurality of reels for rotating the peripheral surface of the drum and a drive mechanism for independently driving the reels is provided as a wire jack trolley, and attached to the wire jack trolley. Hang the hanging tool on the upper part of the heavy object which is carried in from the outside of the system and placed horizontally, hang the hanging hook of the permanent trolley on the lower part of the heavy object, and suspend the wire jack trolley and the permanent trolley. In the reactor containment vessel, the heavy object is moved up to a fixed position by turning a polar crane girder and traversing a work trolley, and the heavy object is suspended and installed by a wire jack. This is a method for installing heavy objects.

According to the present invention, the work trolley is provided with a wire jack sufficient to lift heavy objects, and has a sufficient lift to raise the heavy objects, so that the capacity of the permanent trolley is sufficient. In such a case, suspension with a wire jack trolley is possible in order to raise the heavy object, and the installation operation of the heavy object is easy.

The wire winder attached to the wire jack of the present invention uses a plurality of reels rotating on the peripheral surface of a drum corresponding to a plurality of wires on a fixed drum, and the reels are guided by wire guide rollers. Since a plurality of wires are guided to each reel and each of the wires is adjusted by a drive mechanism that drives the reels independently, the wires do not sag. Further, even if one of the wires deteriorates, it is only necessary to replace the corresponding wire on the reel, so that the restoration can be performed in a short time. Therefore, the function of the wire jack can be sufficiently exhibited in the limited space in the storage container.

Furthermore, since the wire jack and the wire winding machine are integrated, they can be easily carried in and assembled, and can be installed and removed from the storage container in a short time.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing one embodiment of installation of a steam generator in a containment vessel according to the present invention. The same reference numerals are used for terms common to the related art described with reference to FIGS.

In FIG. 1, reference numeral 21 denotes a center hole jack to which a wire winder 22 is attached. These are provided on a work trolley 23 mounted on the polar crane girder 2a. When the steam generator 4 is installed, as shown by a dashed line, the suspension beam 24 attached to the center hole jack 21 of the working trolley 23 is
In addition to connecting to the trunnion 8 at the upper part of the steam generator 4 which is carried in from the outside of the system and placed horizontally, the hanging hook 26 of the permanent trolley 25 is connected to the hanging metal fitting 27 at the lower part of the steam generator 4. Then, the lifting device on the center hole jack 21 and the permanent trolley 25 is simultaneously lifted, and the steam generator 4 placed horizontally on the carry-in carriage 5 is lifted in a horizontal state, and the carriage 5 is withdrawn.

Even if the steam generator 4 is raised up as it is,
When the lowermost part 4a of the steam generator 4 is at a height that does not touch the work floor 9, the center hole jack 21 and the permanent trolley 25 are stopped.

The center hole jack 21 is operated again, and stopped when the steam generator 4 has risen to a certain extent. As shown by the solid line, the permanent trolley 25 is
3 and is stopped when the hanging hook 26 becomes vertical. Further, the center hole jack 21 is operated to raise the steam generator 4.

In the meantime, the permanent trolley 25 is
Move to just before touching and stop. Thereafter, the suspension hook 26 is separated from the suspension fitting 27. With the steam generator 4 suspended vertically, the steam generator 4 is moved to a position just above a fixed position by turning the polar crane garter 2a and traversing the work trolley 23, suspended by the center hole jack 3, and dashed line. The steam generator 4 is installed as shown by.

In carrying out the method of the present invention as described above, the function of the wire winder attached to the center hole jack will be described in detail with reference to FIGS. FIG. 2 is a front view showing an embodiment of a wire winding machine for a center hole jack, and FIG. 3 is a side view of the embodiment shown in FIG.

2 and 3, reference numeral 28 denotes a fixed drum, 2
Reference numeral 9 denotes a plurality of reels for rotating the peripheral surface of the drum, and reference numeral 30 denotes a drive mechanism for independently driving the reels. For example, a hydraulic motor is used. The hydraulic oil in the hydraulic oil tank 31 is operated by the pump unit 32 to drive the hydraulic motor 30.

Reference numeral 33 denotes a guide roller for wire separation, which guides a plurality of wires 34 to each reel 29. FIG. 2, FIG.
In the above, a plurality of reels 29 rotating around the peripheral surface of the fixed drum 28 corresponding to the plurality of wires 34 are used for the fixed drum 28 of the wire winder 22, and the plurality of reels 29 are attached to the plurality of reels 29 by the guide rollers 33 for wire separation. Wire 34
Is guided for each of the reels 29, and the reels 29 are independently driven by the hydraulic motor 30 to adjust each of the wires 34. 35a is a guide sheave.

First, a plurality of wires 34 pulled out from the center hole jack 21 are separated by a guide roller 33 for wire separation via a guide roller 35b, and wound around a predetermined reel 29. Here, the wire 34 is prevented from coming off by the come-off prevention roller 36. Reference numeral 37 denotes a gantry. The tip of the wire 34 is fixed by a bolt.

Next, in order to pull up or down the steam generator 4 by the center hole jack 21, the wire winder 22 is operated.
Through the wire b, the wire is separated for each wire 34 by the guide roller 33 for wire separation, and is wound or unwound on the corresponding plurality of reels 29.

Since each reel 29 can be driven independently by the hydraulic motor 30 for each reel 29, each of the wires 34 can be adjusted. Therefore, each wire does not sag. In addition, even if one of the wires is deteriorated, it is only necessary to replace the wire 34 of the reel 29 corresponding thereto, so that the restoration can be performed in a short time.

According to the present invention, the conventional electric winch / club method requires the construction time for adding the center hole jack 21 and the like in the containment vessel, installing the steam generator 4, and removing the center hole jack 21 and the like after the installation. It can save several weeks compared to when the lifting capacity is increased by the same format,
In addition, work at high places can be reduced and safety is ensured. In the above embodiment, the case where the center hole jack is used has been described, but the present invention is not limited to this. What is necessary is just a wire jack which can exhibit the same function.

In the above embodiment, the steam generator is described as a heavy load. However, it is needless to say that the present invention can be applied to installation of a reactor pressure vessel or the like, which has insufficient lifting capacity of a permanent trolley.

[0029]

According to the method of the present invention, as described above, the work trolley is equipped with a wire jack provided with a wire winder, so that the lifting capacity and head required for installing the steam generator can be increased. In addition, it is easy to add wire jacks and remove it after installation, and it is possible to shorten the construction period and further reduce the work in high places, which is safe.

In addition, when installing the steam generator, the wire used for suspension can be handled with a wire winding machine in an efficient manner. Since it is only necessary to replace the wire of the corresponding reel, it can be restored in a short time, and there is no obstacle to the construction.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of installation of a steam generator in a containment vessel according to the present invention.

FIG. 2 is a front view showing an embodiment of a wire winder for a center hole jack used in the present invention.

FIG. 3 is a side view of one embodiment according to FIG. 2;

FIG. 4 is a diagram showing a state of a steam generator carried into an example of a conventional storage container.

FIG. 5 is a diagram showing a state for standing up the steam generator of the example of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Center hole jack 22 Wire winder 23 Work trolley 24 Hanging beam 25 Service trolley 26 Hanging hook 27 Hanging metal fitting 28 Fixed drum 29 Reel 30 Driving mechanism 31 Hydraulic oil tank 32 Pump unit 33 Wire handling guide roller 34 Wire 35a Guide Sheave 35b Guide roller 36 Detachment roller 37 Mount

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G21C 13/00 B66C 19/00 B66D 1/395 G21C 19/02 G21D 1/00

Claims (1)

(57) [Claims] 1. A trolley for work and a permanent trolley for repair are provided on a polar crane garter in a containment vessel so as to be able to traverse, and the trolley for work is fixed thereon, a guide roller for wire handling, and a periphery of the drum. A wire jack trolley equipped with a wire jack provided with a wire winder having a plurality of reels rotating a surface and a drive mechanism for independently driving the reels, and a hanger attached to the wire jack trolley On the upper part of a heavy object which is carried in from the outside of the system and placed horizontally, the hanging hook of the permanent trolley is hung on the lower part of the heavy object and suspended, and the heavy object is suspended by the wire jack trolley and the permanent trolley. Standing up,
Thereafter, the heavy object is moved to a fixed position by turning the polar crane girder and traversing the work trolley, and the heavy object is suspended and installed by a wire jack.