JPH01110293A - Liner steel plate of reactor containment vessel - Google Patents

Abstract

PURPOSE:To shorten a construction period and reduce the time necessary for setting bevels to each other by dividing and forming a liner steel plate in ring form and mounting it integratedly. CONSTITUTION:Reinforcing materials 2a, 2b are installed on the circumference of upper bevel face neighborhood and a ring liner steel plate on which reinforcing materials 3a, 3b, a spacer block 4, hoisting accessories 5a, 5b are attached to prescribed positions is loaded by a crane to installing positions and installed to the upper part of a liner steel plate successively. A spacer block 4b having a taper part equipped with the reinforcing material 2b of an installed liner structure and a groove 3a having a taper part of the reinforcing material 3a of the liner steel plate 1a mounted thereon are joined. Therefore, the time necessary for setting the bevel can be shortened. Since the outside of the liner steel plate is buried in a concrete structure, the reinforcing materials need not be withdrawn.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a liner steel plate for a nuclear reactor containment vessel.

(Prior Art) Generally, a large diameter steel structure having a cylindrical shape is constructed by bonding a plurality of steel plates together by welding or the like. In this case, the structure is constructed in a ring or band shape depending on the diameter, the material of the steel structure, the plate thickness, the allowable degree of reinforcement of the steel plate, and the capacity of the lifting machine used for construction.

When constructing an RCCV (reinforced concrete reactor containment vessel), it is rational to construct the liner constructed on the inner surface of the reinforced concrete and the concrete structure in contact with the liner in parallel, and this will contribute to shortening the construction period.
The liner steel plate is formed into a ring shape rather than a belt shape, and is being carried out using a method in which it is loaded into the installation location using a large lifting machine.

In addition, since the liner steel plate is relatively thin, reinforcing material is added to the steel plate to withstand the pressure during concrete pouring.
Measures are being planned to prevent deformation.

In this way, the reinforcing material is added and the RCCV liner is sequentially assembled to form a structure, but it is difficult to align the entire circumference with the groove surface of the already installed liner structure at the same time as mounting. It's hard. A general groove alignment method in such a case will be explained using FIGS. 7, 8, and 8. After lowering the upper liner steel plate 1a, a required number of wedges 9 are inserted between both grooved surfaces, and after measuring the distance between the surfaces, the required number of C-clamps 8 are sequentially welded. Next, to match the faces, the required number of C clamps 10 are welded to the upper liner steel plate 1a and the lower liner steel plate 1b.

First, the wedge 9a is inserted into it so as to be in contact with the liner steel plate surface. Then, the wedge 9b is driven into the C-clamp 10 from below to align the surfaces. These operations are performed all around. After this work is completed, the liner steel plates will be circumferentially welded.

(Problems to be Solved by the Invention) Forming the liner steel plate into a ring shape and integrally mounting it at the installation position can contribute to shortening the construction period. However, when a liner steel plate integrally formed in a ring shape is lifted by a lifting machine, a certain degree of deformation is expected.
Adjustment of the groove surfaces due to deformation will affect the construction period. In addition, during the alignment adjustment work of the groove surfaces, it must be held in place by a lifting machine, which is not only safe but also not a rational use of the lifting machine.

The present invention was made to solve the above problems, and by adding a reinforcing material near the groove surface of the liner with a structure that serves both to prevent deformation and to align the grooves, the liner is formed into a ring shape. An object of the present invention is to provide a liner steel plate for a nuclear reactor containment vessel, which allows easy groove alignment even when the liner steel plate is integrally mounted.

[Structure of the invention]

(Means for solving the problem) The liner steel plate set on the inner wall of the reinforced concrete reactor containment vessel is divided into ring shapes, and a ring-shaped liner plate is attached to the outer periphery of the upper end of the divided ring-shaped liner steel plate. A reinforcing material was welded, a hanging tool and a spacer block having a tapered part were welded to the upper surface of this ring-shaped reinforcing material, and a taper was provided on the outer surface of the ring-shaped liner steel plate to match the tapered part of the spacer block. It is found in the liner steel plate of the reactor containment vessel, which is made by welding reinforcing material.

(Function) According to the above configuration, it is possible to prevent deformation when hoisting the ring-shaped liner steel plate with a lifting machine, and also to use it as a lifting device. Groove alignment can be easily performed, and the time required for groove alignment can be greatly shortened.

As a result, the exclusive time of the lifting machine used for loading is also shortened, making it possible to use it more effectively.

(Example) Figure 1 shows a liner steel plate 1a formed into a ring shape.

1b and a reinforcing material for preventing deformation that also serves as groove alignment. FIG. 2 is a partial perspective view of the reinforcing material. FIG. 3 is a cross-sectional view of the liner groove.

First, after forming the liner steel plate into a ring shape, the ring-shaped reinforcing members 2a and 2b are attached to the circumference near the upper end groove surface, and the reinforcing members 3a and 3b, the spacer block 4b, and the hanging tools 5a and 5b are attached to predetermined positions. Ru. The installation is carried out using a lifting machine. As shown in FIG. 4, the lowermost stage has a fillet welded structure in contact with the bottom liner IC at right angles, so a predetermined centering is performed and the ring-shaped reinforcing member 2C and the liner steel plate 1b are welded.

The ring-shaped reinforcing material 2C is welded to the bottom liner IC in advance. Next, the upper stage will be mounted and installed.

Next, it is placed on the liner steel plate that was previously installed using a lifting machine, and the process of aligning both grooves will be explained in Fig. 2. When the liner steel plate 1a to be mounted is lifted down, the previously installed spacer block 4b attached to the reinforcing material 2b of the liner structure and the liner steel plate 1a to be mounted are removed.
The groove 3aa machined in the reinforcing material 3a is joined to the groove 3aa. Since both have a tapered portion, they can be easily joined, and the taper acts to press the ring-shaped liner in the outer circumferential direction by hanging it down. Since the ring-shaped reinforcing material 2b is arranged around the outer periphery of the liner, the displacement in the outer circumferential direction stops when it comes into contact with the reinforcing material 2b, and the horizontal groove is inevitably determined. At the same time, the vertical direction is determined by the contact between the upper surface of the reinforcing material 2b and the lower surface of the reinforcing material 3a.

The dimensions of both liner steel plates 1a and lb are measured and installed, but since each is formed as a single piece, it is easy to predict that errors will occur. In this case, the error is absorbed by the space 11a where both reinforcing materials are in contact.

This can be solved by inserting an adjustment shim (not shown) into 11b.

It is joined to the upper liner 1d as shown in FIG. A ring-shaped reinforcing material 2aa is welded to the liner steel plate 1a, and the upper liner 1d is placed on top of this.

Although groove welding has been omitted in the explanation above, the grooves of the liner steel plates 1a and lb are all welded.

Since the reinforcing materials provided for installation are buried outside the liner steel plate, that is, in the concrete IK, as shown in FIG. 6, there is no need to remove them after installation.

〔Effect of the invention〕

According to the present invention, by forming the liner steel plate into a ring shape and mounting it integrally, it is possible to shorten the construction period, and by forming the liner steel plate into a ring shape, the reinforcing material can be used for hanging tools and groove alignment. This can also be expected to shorten the time required for groove alignment.

Furthermore, since the reinforcing material for the above-mentioned purpose is buried outside the liner steel plate, that is, in the concrete structure, there is no need to remove it.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a liner steel plate according to the present invention, FIG. 2 is a partial perspective view of a reinforcing material according to the present invention, FIG. 3 is a cross-sectional view of the groove portion of the liner steel plate according to the present invention, and FIG. The figure shows how the bottom liner fits in with the bottom liner according to the present invention, FIG. 8 are conventional groove alignment diagrams. la, lb...liner steel plate 1c...bottom liner 2a, 2b...ring-shaped reinforcing material 2aa...ring-shaped reinforcing material 3a, 3b...reinforcing material 4b...spacer block 5a, 5b. ... Hanging tool 6 ... Hanging wire 20 ... Reactor pressure vessel 21 ... Pedestal 2
2...Heat shield wall 23...Diaphragm floor 1K...Concrete 1d...Upper liner IF...Reactor containment vessel lid Agent Patent attorney Noriyuki Ken Yudo Daishimaru Ken Figure 1 JP-A-1-11 (J?9J (Oj Figure 7 qα /α /θ

Claims (1)

[Claims] The liner steel plate set on the inner wall of the reinforced concrete reactor containment vessel is divided into ring shapes, and a ring-shaped reinforcing material is welded to the outer periphery of the upper end of the divided ring-shaped liner steel plate. A reactor containment constructed by welding a spacer block with a hanger and a tapered part to the upper surface of the reinforcing material, and welding a reinforcing material with a taper so as to match the tapered part of the spacer block to the outer surface of a ring-shaped liner steel plate. Container liner steel plate.