JPS607109B2 - Dismantling method for cylindrical concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a cylindrical concrete structure which aims to enable simple and easy dismantling of biological shielding walls for containment vessels of nuclear power plants and other cylindrical concrete structures. This invention relates to a demolition method.

First, let's talk about the dismantling of the biological shielding wall.
This is a cylindrical 4-shaped concrete structure having an H-beam 2 with steel plates 5 attached inside and outside, and the bio-shielding wall 1 thus constructed is formed by standing upright and fixed on the upper part of a concrete vedestal 7.

A pressure vessel 8 is inserted into this living body shielding wall 1 and is appropriately supported, and is also provided with piping and the like. To explain its dismantling, after dismantling the pipes and the like, the pressure vessel 8 protruding from the upper part of the biological shielding wall 1 is cut and disposed of.

Next, the pressure vessel 8 is cut into an annular shape to a position below the height of one cut of the biological shielding wall 1 and processed.

As an example, the pieces 9 are attached at regular intervals along the inner and outer circumferences of the living body shielding wall 1 at the lower part of a single cut portion of the living body shielding wall 1 .

Of course, the pressure vessel 8 is cut at a low enough height that it does not get in the way when the bracket 10 is attached to the piece 9. After attaching the bracket 10 to the piece 9 and re-laying the scaffolding board on the bracket 10, the inner and outer steel plates 5 were cut and removed by keeping a constant distance above and below the cut point of the biological shielding wall 1. After that, a cutting machine 11 such as a wall saw is positioned inside and outside the biological shielding wall 1, and the concrete cylinder 4 is cut along the cylinder with a blade 12. After cutting, the annular concrete structure 4' is hung by a crane and placed in a stockyard. Cut it into small pieces and harden them with concrete to prevent radiation leakage. As described above, the pressure vessel 8 is cut and processed → the Pitas 9 is installed → the bracket 10 and the scaffolding board are installed → the steel plate 5 is cut and processed → the concrete cylinder 4 is cut and processed by the blade 12 of the cutting machine 11. The biological shielding wall 1 is sequentially and repeatedly cut until it reaches the lower part. The Bedestal 7 has appropriate scaffolding inside and outside, and the cutting machine 11 is installed on top of it.
It is sufficient to cut it with the blade 12, lift it up with a crane, and process it in the same manner as described above.

In the cutting and dismantling method described above, after cutting the pressure vessel 8, the piece 9, the bracket 10, and the scaffolding board are cut by the cutting machine 11. are integrally supported by a gate-shaped supporting member 3, and an upper horizontal member 14' is provided with a rotary wheel 5, and the rotary wheel 15 is mounted on the upper surface of the cylinder 4. An annular body 16 having the same diameter as the cylinder 4 is provided, and a self-propelled wheel 18 that is rotated by a motor 17 is provided on the annular body wing 6, and the Mekurirontomi 8 and the support member 13 are supported 6, and the blade 12 is If a material that can be cut simultaneously with the steel plate 5 and the concrete cylinder 4 is used, the cutting can be done without requiring a scaffold.

Of course, at the beginning of cutting, the blade turtle 2 was controlled from the outside to rotate the motor for rotating the blade 12 and a motor provided separately to advance the blade 12 toward the center of the thickness of the concrete cylinder 4 until it reached a certain depth. At this time, the upper self-propelled mechanism 16 is rotated to cut along the annular body 16 in the circumferential direction of the cylinder 4, and when the cutting is completed, the blade 12 is returned to its original position.
The blade 12 is separated from the cylinder 4 and the cutting machine 11 is moved away from the annular body 16.
At the same time, it is moved from the top of the lifting cylinder 4, and the cut concrete structure 4' is lifted up by another crane and processed at the stockyard by the same machine. Of course, by supporting the annular body 16 so that the weight added to the upper end of the cylinder 4 by the support member 13 and the cutting nose force is almost 0, the blade 12 can be used as a support member. Since the concrete structure 4' of the upper cylinder 4 is not pressurized by the weight of the three furnaces 3 and the cutting machine 11, no excessive force is applied, and the cutting can be performed quickly.

As described above, in the present application, the annular body is supported by a crane, the cutting machine is supported on the annular body so as to be self-propelled, the cutting machine is moved along the cylinder 19, and the first cut is made, and after cutting, the cylinder 19 is cut. It is also possible to remove the cutting machine from 19, move the cut concrete structure 19' with another crane, lower it to the ground, and dismantle it.

As mentioned above, the present application supports the inner and outer cutting machines integrally with a gate-shaped support member, provides a rotation mechanism on the upper horizontal member, and places the rotating ring on the upper surface of the cylinder. An annular body with the same diameter as the cylinder is provided, a self-propelled wheel rotated by a motor is provided on the annular body, and the self-propelled wheel and supporting material are appropriately supported. When it advances towards the center of the blade and reaches a certain depth, it rotates the upper cutting wheel and cuts along the annular body in the circumferential direction of the cylinder. The feature is that the cutting machine is moved further away from the top of the cylinder by lifting it together with the annular body, and the cut concrete structure is lifted and processed by another crane, so the demolition process is quick, requires fewer workers, and is handled safely. It has characteristics such as being able to

[Brief explanation of drawings]

Figure 2 is a cross-sectional view of the biological shielding wall in the containment vessel of a nuclear power plant, Figure 2 is a cross-sectional view of the main part, Figure 3 is a cross-sectional view of the disassembled state, and Figure 4 is the cylinder shown in Figure 2. Figure 5 is a perspective view of the piece and bracket, and Figure 6 is a sectional view of another embodiment in a disassembled state. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 figure

Claims (1)

[Claims] 1. The inner and outer cutting machines are integrally supported by a gate-shaped support member,
A rotating ring is provided on the upper horizontal member, the rotating ring is placed on the upper surface of the cylinder, an annular body having the same diameter as the cylinder is provided on the upper part of the cylinder, and a self-propelled wheel rotated by a motor is provided on the annular body. Using a device that appropriately supports a self-propelled wheel and a supporting material, the blade of the cutting machine is advanced toward the center of the thickness of the concrete cylinder, and when it has advanced to a certain depth, the upper self-propelled wheel is rotated to cut the annular body. Cut along the circumferential direction of the cylinder, and when cutting is completed, return the blade to its original position, remove the blade from the cylinder, lift the cutting machine together with the annular body, move it from the top of the cylinder, and use another crane to cut the concrete. A method for dismantling cylindrical concrete structures, which is characterized by lifting and disposing of the structure.