JPH0339757Y2 - - Google Patents

Description

[Detailed description of the device] [Industrial application field] This device is formed around the reactor containment vessel,
This relates to a reactor building shielding wall that is easy to dismantle and dispose of.

[Problem that the invention attempts to solve]

The shielding wall surrounding the containment vessel is constructed as a single piece of reinforced concrete, and because it has to meet requirements for earthquake resistance and shielding, its cross section is quite thick, and it has a large amount of reinforcing steel, making it extremely strong and difficult to dismantle. There is.

This shielding wall is generally activated to a depth of approximately 40 cm from the inside during the reactor operation period, and during dismantling, it is desirable to separate the activated part from the non-activated part and dismantle it. It is difficult to dismantle the building because it is a one-piece, solid structure, and it is impossible to dismantle it separately.

This idea was based on the above circumstances,
The purpose of this paper is to propose a shielding wall that can be easily and safely separated and dismantled.

[Means for solving problems]

When dismantling the radioactive part of the shielding wall, remote control is recommended to prevent workers from being exposed to radiation, dismantling in a closed space is recommended to prevent the spread of radioactive contamination, and block removal is recommended from the standpoint of waste disposal. It is desirable to dismantle the structure.

Therefore, in the present invention, the shielding wall is composed of a reinforced concrete wall and pre-divided concrete blocks, and the concrete blocks are placed inside the wall that will become the radioactive part of the shield wall. In addition, by embedding a plate in the surface of the inner wall of the concrete block, it is possible to lift and recover the concrete block using a magnet, in other words, it can be dismantled by remote control in a closed space, and the dismantling and removal work is completely free from the need of workers. It allows for safe and easy execution without exposing people to radiation.

An insertion hole is formed in the reinforced concrete wall that penetrates between the walls, and a connecting rod with a protruding length that passes through this insertion hole is attached to one of the concrete blocks, and the concrete block is attached to the inner wall side of the wall. The connecting rod is inserted into the insertion hole of the wall, and the tip thereof is tightly tied to the outer wall of the wall to be joined to the wall.

Disassembly of the concrete block is carried out entirely outside the shielding wall by removing the nuts that tighten the connecting rods from the outer wall of the wall and lifting up the plates on the inner wall of the concrete block with magnets.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

As shown in FIG. 1, the shielding wall A of this invention is composed of a reinforced concrete wall 1 and a concrete block 2 placed inside the wall 1.

The concrete block 2 becomes the radiation part of the shielding wall A, and its thickness is set to the depth at which activation is expected. The outer wall 1 becomes a non-radiation part.

An insertion hole 3 is formed between the walls of the wall 1, and a connecting rod 4 having a protruding length that passes through the insertion hole 3 is buried in one of the concrete blocks 2, so that it is integrated. is attached to.

The insertion hole 3 is formed by embedding a sheath 6 in the wall 1 as shown in FIG. 1, and is used as a charging hole for blasting during dismantling.

The connecting rod 4 can be installed by burying the anchor part formed at its base in the concrete block 2 as shown in FIG. It is attached to the concrete block 2 by screwing it together. In the former case, connecting rod 4
By removing the nut 5 fastened to the tip of the
In the latter case, after removing the nut 5, the connecting rod 4 is rotated and removed from the coupler 7, thereby separating the concrete block 2 from the wall 1, that is, separating and dismantling the radiation part. Coupler 7
has an anchor connected to it.

Further, a plate 8 used for lifting during demolition is embedded in the surface of the concrete block 2 on the opposite side of the connecting rod 4.

The concrete block 2 to which the connecting rod 4 is attached as described above is placed inside the wall 1 as shown in FIG. Nut 5 on the tip protruding from the side
It is joined to the wall body 1 by tightening.

In this embodiment, the end face of the concrete block 2 is roughened to facilitate construction during assembly, and at the same time, it is possible to form a strong shielding wall A when integrated with the wall body 1.

To dismantle the shielding wall A, first remove the nuts 5 on the outside of the wall 1, lower the crane's lifting jig with an electromagnet attached to the tip from above the shielding wall A, and use this magnet to lift the plate 8. This is done by remote control by supporting the concrete block 2 while suctioning it and lifting it outside.

Further, the wall 1 is dismantled after the insertion holes 3 are charged with a charge and the concrete and reinforcing bars are loosened by blasting.

[Effect of idea]

This idea is as described above, and since the divided concrete blocks are joined to the inside of the reinforced concrete wall structure, only the radiation part can be easily separated and dismantled.

In addition, the connecting rods that connect the wall and concrete block are attached to the concrete block side, and their tips are fastened on the outside of the wall, and a plate is embedded in the inner surface of the concrete block, so that the radioactive part All dismantling and recovery can be carried out only by work outside the shielding wall, and this work can be accomplished without exposing workers to radiation.

Further, since the fastening portion of the connecting rod is provided outside the wall, there is no need to secure a space inside the shielding wall for tightening nuts, and the shielding wall can be formed with reasonable dimensions.

In addition, the non-radiation part, that is, the wall can be easily dismantled using the through holes, so that the overall dismantling work can be completed in a short period of time.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention;
FIG. 3 is a sectional view illustrating a concrete block. A... Shielding wall, 1... Wall body, 2... Concrete block, 3... Insertion hole, 4... Connection rod, 5...
...Natsuto, 6...Sheath, 7...Coupler, 8...
…plate.

Claims (1)

[Scope of utility model registration request] A reinforced concrete wall is formed with an insertion hole that penetrates between the walls, and a connecting rod that has a protruding length that penetrates the insertion hole is attached to this wall side,
It consists of a concrete block with a plate embedded in the opposite surface, and the concrete block is placed on the inner wall side of the wall, and the connecting rod is inserted into the insertion hole of the wall, and its tip is inserted on the outer wall side of the wall. A reactor building shielding wall characterized by being tightly connected to a wall.