JPH04262296A - Fixing structure of penetration at reinforced concrete reactor container - Google Patents

Abstract

PURPOSE:To enable fixing a penetration on a liner hung down as a cylindrical shape with a large crane for mitigating the local distortion of liner for a reinforced concrete reactor container. CONSTITUTION:A liner anchor 2 vertically fixed to contact liner 1 to reinforced concrete 7 is bridged over the liner 1 and the flange plates 5, 6 of the penetration and the both are fixed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction structure for a reactor containment vessel in a nuclear power plant, and more particularly to a structure for attaching a penetration part of a reactor containment vessel.

0002

2. Description of the Related Art A conventional construction method for constructing a reactor containment vessel 13 by attaching a penetration portion 4 to the reactor containment vessel 13 will be described with reference to FIGS. 3 to 5.

The conventional reactor containment vessel 13 is a self-supporting steel reactor containment vessel, and as shown in FIG. They were installed in order starting from container 13. At this time, the penetration part 4 is already installed in the reactor containment vessel 13 via the penetration part reinforcing plate 14.
3 and the penetrating portion 4 were integrally hung. Figure 5 shows the installation state of the penetration part.

[0004] In this construction method, since the conventional reactor containment vessel 13 is a self-supporting steel reactor containment vessel, the steel plate thickness is approximately 30 m.
This is possible because the reactor containment vessel 13 itself has sufficient rigidity to withstand suspension even when the reactor containment vessel 13 itself also serves as a support for the penetrating portion 4 and the like.

[0005] Here, the role of the reinforcing ring 16 is to serve as a reinforcing ring to prevent the entire reactor containment vessel 13 from deforming.
4 and the reactor containment vessel 13 are not locally reinforced.

[0006]

[Problems to be Solved by the Invention] The above-mentioned prior art is only applicable to lifting a self-supporting steel reactor containment vessel; When the liner 1 corresponding to the container 13 is transported, suspended, and installed, the rigidity of the liner 1 is not taken into consideration, and there is a problem in that reinforcement is required.

A reinforced concrete reactor containment vessel for which application is currently planned will be explained with reference to FIGS. 6 to 8. This reactor containment vessel is composed of reinforced concrete 7 with liner 1 as the inner lining boundary, and liner 1 and reinforced concrete 7 are connected by liner anchors 2. The liner anchors 2 are connected by flat plates 3 to provide sufficient rigidity to make the liner 1 self-supporting. A through portion 4 is connected to the body of the liner 1 constructed in this manner via a circular inner flange plate 5. Further, a circular outer flange plate 6 is installed on the outer surface of the penetrating portion 4 protruding from the reinforced concrete 7, and together with the inner flange plate 5, the structure is such that the load received by the penetrating portion 4 is transmitted to the reinforced concrete 7. It has become.

[0008] When the conventional construction method is applied to this structure,
Because the liner 1 is extremely thin at 6.4 mm, which is about one-fifth of the thickness of conventional steel plates, the liner 1 weighs less than the weight of the penetration part 4 at all times, including during factory manufacturing, transportation, and lifting. There was a problem that it could not withstand the heat and caused local deformation.

A known example for solving this problem will be explained with reference to FIGS. 9 and 10.

This measure prevents local deformation of the liner 1 by fixing the through portion 4 attached to the liner 1 from the outer flange plate 6 through the fixing wire 9 to the liner anchor 2 on which the fixing lug 10 is installed.

In this construction method, as shown in FIG. 10, there is interference with the fixing wire 9 and the fixing lug 10 when the reinforcing bars 8 are assembled, which makes the work of arranging the reinforcing bars 8 very difficult and requires a large amount of man-hours. be. Moreover, the fixing wire 9 and the fixing lug 10
Since these cannot be removed until the concrete is poured, a problem arises in that the fixing wire 9 and the fixing lug 10, which are members for reinforcing the penetrating portion, remain in the reinforced concrete 7.

Next, in order to fix the penetrating portion 4 by applying a conventional known example, a flat plate 3 corresponding to the reinforcing ring 16 is installed.
The problems encountered when attempting to join the inner flange plate 5 to the inner flange plate 5 are shown below.

First, the number of reinforcement members required for reinforcement must be provided at the location where the penetration portion 4 exists, but this number is significantly greater than the number required for the purpose of preventing the entire reactor containment vessel 13 from deforming. It turns out. Second, in order to prevent the entire reactor containment vessel 13 from deforming in order to expect the effect as the reinforcing ring 16, the flat plate 5 must surround the entire reactor containment vessel 13; If the flat plate 5 and the flat plate 5 are at the same height, interference is unavoidable and the reinforcing ring 16 is cut out, causing a problem that the reinforcing ring loses its function.

Thirdly, the penetration part 4 needs to be restrained from bending in the vertical direction due to its own weight until the concrete is poured and fixed, but the horizontal flat plate 5 cannot be bent in the vertical direction. This is the most inappropriate direction to press.

The purpose of the present invention is to solve the above problem and solve the problem of the penetration part 4.
In order to prevent local deformation of the liner 1 due to the installation of
The purpose is to allow you to install the .

[0016]

The above objects are achieved by connecting the liner anchor 2 and the inner flange plate 5.

The liner anchor 2 contributes to the bonding between the liner 1 and the surrounding reinforced concrete 7, and also has the effect of increasing the rigidity of the thin liner.

This liner anchor 2 is not cut near the inner flange plate, but is extended and connected to the surface of the inner flange plate 5 on the concrete placement side, so that it can be penetrated without providing special reinforcement such as the fixing wire 9. The section 4 can be installed and transported, and the liner 1 can be suspended and installed in an integral cylindrical form. Furthermore, there is no need to consider interference with reinforcing members when incorporating the reinforcing bars 8.

[0019] As a result, the number of man-hours can be significantly reduced in the process from in-factory installation of the penetrating portion 4 to the liner 1 to on-site installation and concrete pouring. In addition, after the penetration part 4 is attached to the liner 1 on the ground, the integral cylindrical shape allows for assembly using a large crane, which can be expected to ensure reliability by reducing the number of hoisting operations and improve the installation accuracy of the liner 1. .

[0020] Due to the above effects, it is possible to shorten the construction period of the entire nuclear power plant.

[0021]

[Function] In the present invention, the key point is how to attach the heavy penetrating portion 4 to the liner 1, but since the liner 1 is a thin steel plate of approximately 6.4 mm, the liner 1
It is difficult to support the penetrating portion 4 alone. The original function of the liner 1 is simply the boundary of the reactor containment vessel, and liner anchors 2 are installed vertically on the outer surface of the liner 1 at intervals of about 500 mm, and horizontally installed at intervals of about 2 m. The flat plates 3 form vertical and horizontal grids, respectively, and are integrated. This highly rigid lattice structure surrounds the entire circumference of the liner 1, and by connecting this highly rigid liner anchor 2 or flat plate 3 to the inner flange plate 5 attached to the penetration part 4, the weight of the penetration part 4 is reduced from the liner anchor. 2 or flat plate 3 to prevent local deformation of the liner 1.

At this time, if the inner flange plate 5 is circular, the length of the line to which the liner anchor 2 or flat plate 3 is connected will be reduced.

Furthermore, it becomes necessary to change the arrangement pitch of the liner anchors 2 or the flat plates 3 in order to ensure the necessary line length.

In order to solve this problem, the inner flange plate 5 is made rectangular, so that the liner anchor 2 or the flat plate 3 can secure the necessary rigidity without changing the arrangement pitch only at the mounting position of the penetration part 4. The connection length of the liner anchor 2 or flat plate 3 is ensured.

If the flat plate 3 is notched at even one place around its circumference, it will not be possible to prevent the entire reactor containment vessel 13 from being deformed, but since the flat plate 3 is connected to the liner anchor 2, conventional The liner anchor 2, which does not exist in the example, becomes a load transmission member and reinforces the notched flat plate 3. Therefore, even if the flat plate 3 interferes with the penetration part 4 and needs to be notched, the reactor containment vessel 13 It is possible to prevent overall deformation.

Furthermore, since the liner anchor is arranged in the vertical direction, it is possible to suppress vertical displacement of the penetrating portion from the direction with the most efficient restraint until concrete is placed.

[0027]

Embodiments An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

An inner flange plate 5 and an outer flange plate 6 are installed at both ends of the penetrating portion 4.

The inner flange plate 5 has a rectangular shape, and since it is connected to the liner 1, the outer periphery of the inner flange plate is sloped on the concrete pouring side with a slope of one-third or less of the plate thickness difference with the liner 1. There is.

[0030] Since this inner flange plate has a thickness of approximately 50 mm, load transmission to the through portion 4 is sufficient.

On the other hand, liner 1 has an outer surface of approximately 500 mm.
Liner anchors 2 with a T-shaped cross section are installed vertically at intervals of about 2 m, and flat plates 3 are installed horizontally at intervals of about 2 m, respectively, arranged in a grid pattern and surrounding the entire circumference. This liner anchor 2 or flat plate 3
The through part 4 is connected to the inner flange plate 5.
and is extended to a position that does not reach the base of the inner flange plate 5.

The liner anchor 2 and flat plate 3 are cut into shapes along the shape of the inner flange plate 5, and a scallop is provided at the joint of the liner 1 and the inner flange plate 5 to connect to the concrete pouring side of the inner flange plate 5. be done. At this time, a circular flange plate as conventionally designed cannot ensure a sufficient length of the connection part, but in the present invention, since the inner flange plate 5 is rectangular, it has a sufficient connection length for the liner anchor 2 or flat plate 3. It is now possible to ensure that

Furthermore, in the case of a circular flange plate, the cutout of the liner anchor 2 must be carried out along the sloped part with curvature, but in this case, by making the flange plate rectangular, the notch processing of the liner anchor 2 must be carried out along the curvature. This can be handled through processing. Next, the construction order of the reinforced concrete reactor containment vessel is shown below. In the factory, the liner anchor 2, flat plate 3, and through-hole 4 to which the inner flange plate 5 and outer flange plate 6 are attached are assembled into a state in which the liner 1 is assembled into one piece. The divided liners 1 are transported as they are, connected in a cylindrical shape at the site, and hung and installed in an integral cylindrical shape from the lower stage. At this time, reinforcing bars 8 are assembled in parallel, concrete is poured in stages, and a reinforced concrete reactor containment vessel consisting of the liner 1 and the reinforced concrete 7 is constructed.

According to this embodiment, the work can be carried out with the penetrating portion 4 attached to the liner 1 from the time of factory manufacture to the time of on-site installation without using any special reinforcement.

[0035]

[Effects of the Invention] According to the present invention, the following effects can be obtained.

(1) Using the existing liner anchor or flat plate 3 as a reinforcing member to support the penetration part 4,
Because it can be utilized, the number of man-hours required to manufacture special reinforcement for the approximately 200 through-holes 4 per plant can be significantly reduced.

(2) When installing the reinforcing bars 8, there is no need to use the fixing wire 11 or the fixing lug 10, so the number of man-hours spent on avoiding interference can be eliminated.

(3) During concrete pouring, the reliability of the liner 1 and the reinforced concrete 7 is improved because there is no need to bury the reinforcing members that have been installed temporarily, such as the existing liner anchor 2 or the flat plate 3. becomes.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a state in which a liner is suspended according to an embodiment of the present invention.

FIG. 2 is a longitudinal cross-sectional view of the installed state of the penetration part of the present invention.

FIG. 3 is an overall sectional view of the steel self-supporting reactor containment vessel.

FIG. 4 is a diagram showing a state in which a steel plate of a conventional reactor containment vessel is suspended.

FIG. 5 is a vertical cross-sectional view of a conventional penetrating portion attached.

FIG. 6 is a cross-sectional view of a reinforced concrete reactor containment vessel.

FIG. 7 is a cross-sectional view of the liner anchor.

FIG. 8 is a vertical cross-sectional view of the penetrating portion attached.

FIG. 9 is a diagram showing a state in which the liner is suspended.

FIG. 10 is a vertical cross-sectional view of a state in which the penetration part is installed.

[Explanation of symbols]

1... Liner, 2... Liner anchor, 3... Flat plate, 4... Penetration part, 5... Inner flange plate, 6... Outer flange plate, 7... Reinforced concrete, 8... Rebar, 9
...fixing wire, 10...fixing lug, 11...hanging wire, 12...reactor pressure vessel, 13...reactor containment vessel,
14... Penetration part reinforcing plate, 15... Liner anchor for spanning,
16...Reinforcement ring.

Claims (1)

[Claims] 1. A nuclear reactor made of reinforced concrete, characterized in that a liner anchor of a reinforced concrete reactor containment vessel and a flange plate of a penetrating portion are fixed by spanning a vertical liner anchor installed to connect the liner to the reinforced concrete. Installation structure of the penetration part of the containment vessel.