JPH0442313Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a crane mount for a temporary crane used during construction work inside a containment vessel of a nuclear power plant.

[Prior Art] It is well known that construction work for nuclear power plant containment vessels is generally carried out using temporary cranes.

Conventionally, this temporary crane has been placed on a crane pedestal as shown in FIG. As shown in the figure, the crane mount a includes a base c installed at the bottom of the containment vessel b, a mast d erected on the base c, and a crane mounting base e installed on the mast d. It is formed from. As shown in FIG. 6, the crane mounts a on which the temporary crane f is mounted are distributed and installed at, for example, three locations near the inner wall g of the containment vessel b.

[Problems to be solved by the invention] By the way, this type of crane mount a has the following problems.

The base c that constitutes the crane mount a is the containment vessel b.
Since the long-span mast d is erected on the base c, there is a problem that the crane mount a gets in the way of the work inside the containment vessel b, reducing work efficiency. .

In addition, since the crane mount a consists of the base c, the mast d, and the crane mount e, and the mast d is particularly long, the crane mount a becomes large and takes time to install. , there was a problem that the number of man-hours and equipment costs for temporary construction increased.

In view of the above-mentioned problems, it is an object of the present invention to provide a crane mount that is small and does not interfere with the internal work of the containment vessel.

[Means for Solving the Problems] In order to solve the problems in the prior art, the present invention provides a crane mount for supporting a temporary crane inside the containment vessel of a nuclear power plant in order to carry out construction work inside the containment vessel of a nuclear power plant. A ring girder for a polar crane is provided along the circumferential direction of the inner wall of the containment vessel, an upper end portion is pivotally supported on the ring girder, a lower end portion is suspended along the inner wall, and the inner side a hanging arm that is swingably supported in the wall direction; a crane mounting table that extends horizontally from the hanging arm toward the inside of the containment vessel, and on which a temporary crane is placed; The suspension arm includes a support member extending from the lower end of the hanging arm and abutting against the inner wall so as to support a horizontal load on the inner wall.

[Function] By having the upper end of the hanging arm configured as described above pivotally supported by the ring girder, the lower end becomes a free end and is supported swingably in the direction of the inner wall. In addition, since a support member is provided at the lower end of the hanging arm, when the crane is placed on the mounting table, the lower end of the hanging arm moves toward the inner wall. The member abuts against the inner wall to hold the hanging arm in the vertical direction with a predetermined gap between the members and the inner wall, and the load of the crane placed on the ring girder is supported by the ring girder and the inner wall. Stress is dispersed.

[Example] An example of the crane mount of the present invention will be described in detail below with reference to the accompanying drawings.

The crane mount of the present invention utilizes a ring girder 4 for a polar crane 3 which is permanently installed on the inner wall 2 of a containment vessel 1 of a nuclear power plant as shown in FIG.

The crane mount 5 of the present invention is constructed as shown in FIG. As shown in the figure, a ring girder 4 for attaching a polar crane 3 is permanently installed along the circumferential direction at the upper part of the inner wall 2 of the containment vessel 1. The upper end of a hanging arm 6 is suspended from the ring girder 4. This hanging arm 6 is formed of a rectangular frame body provided with a reinforcing member 17, as shown in FIG. The upper end of the hanging arm 6 is connected to an engaging member 7 attached to the lower part of the ring girder 4.
It is coupled and pivotally supported by a pin 8, and its lower end is supported as a free end so as to be swingable in two directions of the inner wall. In addition, the inner wall 2 at the lower end of this hanging arm 6
A support member 9 is provided protruding from the side, and this support member 9 supports the hanging arm 6 by coming into contact with the inner wall 2. At the lower end of the hanging arm 6, on the opposite side of the support member 9, there is a crane platform 10 that extends horizontally and faces the inside of the containment vessel 1.
is permanently installed. This crane mounting table 10 has reinforcing members 7 to support the load of the crane 11.
It is made of reinforced steel plate. The outer periphery of this crane mounting table 10 is surrounded by a stay member 12 to prevent the crane 11 from falling.
covered with. The inside of the containment vessel 1 of this stay member 12 can be opened and closed. A reinforcing beam 13 is spanned between the hanging arm 6 and the crane platform 10 to maintain the crane platform 10 horizontally to prevent the crane 11 from falling.

Next, the operation of the above embodiment will be described.

The crane mount 5 of the present invention consists of a hanging arm 6 and a crane mounting base 10.
0 is fixedly attached to the lower end of the hanging arm 6 and formed integrally therewith. The upper end of this hanging arm 6 is suspended from a ring girder 4 for a polar crane 3 permanently installed on the upper part of the inner wall 2 of the containment vessel 1 along the circumferential direction thereof. Therefore, the crane mounting base 10 on which the hanging arm 6 is integrally formed is also suspended together with the hanging arm 6. As a result, there is no need to provide a base or a mast below the crane platform 10 as in the prior art. Since no base or mast is provided below the crane platform 10, a space is formed in that area, and internal work is not obstructed.

Here, the hanging load of Polar Crane 3 is usually 200
Due to the large load of ~500t, the above ring girder 4
The reaction force can be sufficiently tolerated even if the crane pedestal 5 is suspended.

Further, a support member 9 is provided at the lower end of the hanging arm 6 on the side of the inner wall 2, and when this support member 9 comes into contact with the inner wall 2, the hanging arm 6 and the support member 9 are formed integrally therewith. The crane mounting stand 10 is on the inner wall 2
Because it is supported by
The levelness of the ring girder 4 is maintained and the ring girder 4
The stress on the surface is dispersed. A normal traveling crane is adopted as this crane 11, and when the crane 11 is temporarily installed on the crane mounting platform 10, the stay member 12 formed along the outer periphery of the crane mounting platform 10 is placed inside the containment vessel 1. This is done by leaving the sides open.

Further, since the crane mount 5 consists of a hanging arm 6 and a crane mounting base 10, and is smaller than the conventional one, the installation time is shortened.

In this embodiment, since the pin 8 is inserted through the engagement member 7 attached to the lower part of the ring girder 4 to suspend and fix the hanging arm 6, for example, in the circumferential direction of the ring girder 4. However, it is necessary to use a moving mechanism (not shown) for moving the hanging arm 6 along the ring girder 4 and a crane 11 at the hanging part between the ring girder 4 and the hanging arm 6. If a locking mechanism (not shown) for fixing the hanging arm 6 to the ring girder 4 is provided, construction work inside the containment vessel 1 can be carried out using one crane 11.

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) Since the crane mount is suspended from the polar crane ring girder permanently installed on the inside wall of the containment vessel, there is no need for a base or mast as in the past, so it does not interfere with internal work and improves work efficiency. can be improved.

(2) Since the crane mount has become smaller, installation time is shortened, and the number of man-hours and equipment costs for temporary construction can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the crane mount of the present invention, Fig. 2 is a front view showing a hanging arm constituting the crane mount of the present invention, and Fig. 3 is a crane configuring the crane mount of the present invention. FIG. 4 is a schematic side sectional view showing the containment vessel of a nuclear power plant; FIG. 5 is a side view showing a conventional crane mount; and FIG. 6 is a diagram showing the installation of the conventional crane mount into the containment vessel. It is a schematic diagram showing an example of installation. In the figure, 1 is a containment vessel, 2 is an inner wall, 3 is a polar crane, 4 is a ring girder, 5 is a crane mount, 6 is a hanging arm, and 10 is a crane mounting base.

Claims (1)

[Scope of utility model registration request] In a crane mount that supports a temporary crane inside the containment vessel for carrying out construction work inside the containment vessel of a nuclear power plant, a ring girder for a polar crane is provided on the inner wall of the containment vessel along its circumferential direction. a hanging arm whose upper end is pivotally supported by the ring girder, whose lower end is suspended along the inner wall and supported swingably in the direction of the inner wall; a crane mounting stand facing inward and extending horizontally, on the upper part of which a temporary crane is placed; A crane mount comprising a support member that supports a horizontal load.