JPS61186671A - Construction of nuclear reactor storing vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method of constructing a nuclear reactor containment vessel, etc., and particularly to a method suitable for constructing a concrete ceiling slab.

``Prior art and its problems'' Reactor containment vessels have been put into practical use, such as those with a liner 4 pasted on the inner surface of a concrete side wall 1, as shown in the example in Figure 5. In the case of a structure in which a concrete ceiling slab 9 is mounted on the top of the side wall l, the volume of the dry well 12 portion increases, and the piping, equipment, pipe whip structure 13, etc. installed therein are unitized. Since it can be assembled by inserting it in a suspended state from the upper part of the side wall l, the construction process can be streamlined.

However, if the ceiling slab 9 has a large diameter and becomes a heavy object, it will be necessary to construct it while supporting it, and the construction method will be easily subject to restrictions. A conventional example of the construction method in this case will be explained based on FIG. 5. After completing the construction of the side wall I and the diaphragm floor 11, the pipe whip structure 13 and other equipment are installed on the diaphragm floor 11. Next, a large number of liner support members 15 are erected on the floor surface of the diaphragm floor 13, and the liner 4 is supported by the liner support members 5, and the supported liner 4 A concrete ceiling slab 9 is constructed by pouring concrete on top of the concrete. Therefore, there is a height of from the diaphragm floor 11, and
The construction cost of the reactor containment vessel increases because the work of constructing the ceiling slab 9 is severely restricted due to the necessity to avoid various equipment installed in the dry well 12, the pipe whip structure 13, etc. There is a problem in that it invites

``Objects of the Invention and Means for Achieving the Same'' The present invention effectively solves the problems of the prior art.B, the provision of liner support material in the dry well part is omitted, and the influence on the dry well part is reduced. The purpose of the present invention is to shorten the construction process and construction accuracy of the reactor containment vessel. A process that combines the following steps: installing a liner on the underside of the horizontal support beam; and pouring concrete for the ceiling slab on top of the installed liner. This is to construct a reactor containment vessel.

"Example" Hereinafter, an example of the method for constructing a reactor containment vessel of the present invention will be described with reference to FIGS. 1 to 3. "Steps of forming side walls up to the first stage" FIG. As shown in A), the side wall l is formed to most of the overall height, for example, to the height of the reactor shielding wall 2. A cantilever-shaped horizontal support beam 3A, which has been assembled in advance at a factory or the like, is mounted on top of the frame in a state where it is extended to the center. Horizontal support beam 3 in this case
As shown by (N) in FIG. 2, A is constructed by sequentially assembling a plurality of parts divided in the circumferential direction.

"Installing the liner is a forming process" As shown in Figure 1 (B), on the underside of the horizontal support beam 3A,
The ceiling slab liner 4 is attached, and its inner end is supported by a support beam support material 5 erected on the upper part of the reactor shielding wall 2. This ceiling slab liner 4 is divided into multiple parts as shown by (N) in Figure 2 in accordance with the horizontal support beam 3A, and is attached to the top surface for reinforcement as shown in Figure 3. The set cut tee 6 is supported by a hanging tool 7 such as a hanging bolt, and the seams 8 are connected by welding to form an integral structure with a sealing property.

``Concrete placement process J Next, horizontal support beam 3A and horizontal support beam support material 5
Figure 1 (C
), concrete is poured into the remaining part of the side wall 1 and the part above the liner 4 for the ceiling slab to form the ceiling slab 9, and the ceiling slab 9 thus formed is covered with concrete. The horizontal support beam support material 5 is removed from the opening 10 as shown by the arrow in FIG. 1(C). In addition,
In this case, the horizontal support beam 3A will be buried in the concrete wall.

When the reactor containment vessel is constructed through such a series of steps, the side wall 1, the reactor shielding wall 2, and the diaphragm floor 1 are constructed.
The pipe whip structure 13 and other equipment installed in the dry well 12 surrounded by It can be implemented. In addition, the code|symbol 14 in FIG. 3(B) is a reinforcing steel.

Further, referring to FIGS. 4(A) and 4(B), another embodiment of the method for constructing a reactor containment vessel, etc. of the present invention will be described. , the divided ceiling slab liner 4 is attached to the lower side, and the joints 8 are welded to form an integral structure with sealing properties.

In addition, in each of the embodiments described so far, the horizontal support beam 3A
・Although the explanation has been made assuming that the 3B is divided, if the crane etc. to be suspended has a sufficient size, it may be mounted all at once. Furthermore, these techniques can also be applied to containers, tanks, etc. other than reactor containment vessels.

"Effects of the Invention" As explained above, the method for constructing a nuclear reactor containment vessel, etc. of the present invention supports the load of the ceiling slab liner and the concrete poured thereon by the horizontal support beams. Since there is no interaction with various equipment installed inside the drywell, pipe whip structures, etc., the problems of the conventional technology can be effectively solved, and the installation of support materials is also possible. The construction process of the reactor containment vessel can be shortened by reducing the labor required for construction and removal, and the construction accuracy can be improved as the liner is supported by horizontal support beams. It has the following effects:

[Brief explanation of the drawing]

1(A) to 1(C) are process explanatory diagrams in one embodiment of the method for constructing a reactor containment vessel of the present invention, and FIG.
Figure 3 (A) and (B) are enlarged views of the part indicated by chain line I [IA in Figure 1 (B) and its IIIB-111B arrow view. , Fig. 4 (A) and (B
) are a front sectional view and a plan view for explaining another embodiment of the method for constructing a reactor containment vessel of the present invention, and FIG. 5 is a front sectional view for explaining a conventional example of the method for constructing a reactor containment vessel. . ■・・・Side wall, 2...Reactor shielding wall, 3
...Horizontal support beam, 4...Liner, 5...
...Support material for horizontal support beam, 6 ... Cut tee, 7 ... Hanging fixture, 8 ... Seam, 9 ... Ceiling slab , 10...Aperture,
11...Diaphragm floor, 12...
・Dry well, 13...Pipe whip structure. Figure 1+8) (Al
Figure 1 (C) Figure 4 (A) Figure 2 Figure 4 Figure 3 (B)

Claims (1)

[Claims] A process of installing a horizontal support beam extending to the center on the concrete side wall, a process of attaching a liner to the underside of the horizontal support beam, and pouring concrete for the ceiling slab portion on top of the installed liner. A method for constructing a nuclear reactor containment vessel, etc., comprising the steps of: