JPS607110B2 - Dismantling method for a cylindrical concrete structure with a steel plate container inside - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a cylindrical concrete structure having a steel plate container inside, the object of which is to enable simple and easy dismantling of a cylindrical concrete structure for a biological shielding wall of a nuclear power plant. This relates to the method of dismantling structures.

Regarding the disassembly of the living body shielding wall 1, the living body shielding wall 1 is formed by standing and fixing the living body shielding wall 1 thus constructed 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 piping, etc., the pressure vessel 8 protruding from the top of the biological shielding wall is cut off, hoisted by a crane, and transported to a stockyard.
・Cut into pieces and harden them with concrete, etc.

Next, the pressure vessel 8 is cut into an annular shape to a position below the cutting height of the i times of the living body shielding wall, lifted by the same crane, transported to a stocker for one day, and treated in the same manner as described above.
Next, pieces 9 are attached to the outside of the cylinder 4 at regular intervals along the circumference at the locations where the biological shielding wall is cut once.
After attaching the bracket IQ to the bracket 10 and remounting the scaffolding board on the bracket 10, a small-diameter disc-shaped scaffolding material 11 (from the inner wall of the cylinder 4) is formed separately.
A reinforcing material 11 made of type 1 steel and channel steel is provided on the lower surface of the steel plate 1 .

This scaffolding material 11 is suspended by a crane and laid on the upper end of the pressure vessel 8 which is being cut to form a work site. Thereafter, the inner and outer steel plates 2 are cut and removed by keeping a constant distance above and below the cut point of the living body shielding wall, and then hung by a crane and processed in the same manner as described above in the stockyard. are placed inside and outside the biological shielding wall and cut along the cylinder of a concrete cylinder 4 using a plaid furnace 3. After cutting, the annular concrete structure 4 is hung by a crane and cut into small pieces using a stockard in the same manner as described above. It will be hardened with concrete, etc. to prevent radiation leakage.

After that, the scaffold Muratomiki was lifted up by a crane and removed from the upper part of the circle 4, and the pressure vessel 8 was cut at a certain height and removed, and the above operations were repeated to sequentially dismantle it down to the bottom.

That is, "Attach the bracket 10 to the external piece 9 of the cylinder → soften the scaffolding board on the bracket IQ → guide the disc-shaped scaffolding material 15 to the upper end of the pressure vessel 8 → cut the inner and outer steel plates 2. Remove → Process the steel plate 2 → Cut the cylinder 4 with the blade 3 of the cutting machine 2 → Lift up the scaffold material and remove it from the top of the cylinder 4 → Cut the pressure vessel 8 → Perform the above operations in sequence Repeatedly dismantle down to the bottom.

The pedestal 7 may be suitably provided with scaffolding inside and outside, and on the top thereof, the Play-Doh 31 of the cutting machine 12 may be used to cut the scaffold, and then lifted by a crane and processed in the same manner as described above.

In this application, after dismantling the piping, etc. as described above, and cutting the pressure vessel protruding from the upper part of the biological shielding wall, the pressure vessel is annularly cut to a position below the height of one cutting of the biological shielding wall. Attach the bracket to the piece attached to the outside of the biological shielding wall, lay the scaffolding board on the bracket, and then lay a disc-shaped scaffolding material with a diameter smaller than the inner diameter of the cylinder at the top of the pressure vessel. After that, the inner and outer steel plates were cut and removed by keeping a constant distance above and below the cut point of the living body shielding wall, and then a cutting machine such as a wall saw was used to cut the inside and outside of the living body shielding wall. Cut a concrete cylinder with a plaid trowel and place it on the scaffolding.
After that, a crane is used to lift the scaffolding material and remove it from the top of the cylinder, and the pressure vessel is cut to a certain height and removed, and the scaffolding material is placed on the top of the pressure vessel again, a bracket is attached to the piece, and the scaffolding is placed on the placket. Layer the board,
The feature is that the above-mentioned work is repeated and dismantled down to the bottom one by one, so instead of installing scaffolding material inside the cylinder every time (every step), a circular scaffolding material with a diameter smaller than the inner diameter of the cylinder is placed inside the cylinder. It is easy and quick to form a workshop by simply placing a layer on the top of a steel plate container, and it also has features such as good workability by layering scaffolding material on the top of the container.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the biological shielding wall for the containment vessel of a nuclear power plant, Figure 2 is an enlarged view of the main part, Figure 3 is a cross-sectional view of the main part showing the disassembled state, and Figure 4 is the scaffolding. A plan view of the village, Figure 5, is a perspective view of the piece and bracket. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 After dismantling the piping, etc., cut the pressure vessel protruding from the top of the biological shielding wall, and then cut the pressure vessel into a ring shape to a position below the height of one cutting of the biological shielding wall, and remove the biological shielding. After attaching a bracket to a piece attached to the outside of the wall and placing a scaffolding board on the bracket, a disc-shaped scaffolding material with a diameter slightly smaller than the inner diameter of the cylinder was placed on the upper end of the pressure vessel to create a work area. After that, the inner and outer steel plates are cut and removed by keeping a constant width above and below the cut point of the living body shielding wall, and then a cutting machine such as a wall saw is positioned on the scaffolding inside and outside the living body shielding wall and the blade is cut. The concrete cylinder is cut at a concrete cylinder, and then a crane is used to lift the scaffolding material and remove it from the top of the cylinder.The pressure vessel is cut to a certain height, removed, and the scaffolding material is placed on the top of the pressure vessel again. A method for dismantling a cylindrical concrete structure having a steel plate container inside, characterized in that a bracket is attached to the piece, a scaffold board is placed on the bracket, and the above operation is repeated to sequentially dismantle down to the lower part.