JPH083548B2 - Joint structure between the reactor containment diaphragm floor and the reactor body foundation - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure for transmitting a load generated at a joint between a diaphragm floor of a reactor containment vessel and a foundation of a reactor body by a surface pressure and a stud.

[Conventional technology]

The conventional joint structure of the diaphragm floor of the reactor containment vessel is known from Japanese Patent Application Laid-Open No. 62-228976 and is shown in FIGS. 2 and 3.

FIG. 2 shows the entire reactor containment vessel 1. The diaphragm floor 2 made of reinforced concrete is a disk floor for partitioning the inside of the containment vessel into two spaces, the dry well 3 and the suppression chamber 4, and the foundation 6 of the reactor main body supporting the reactor pressure vessel 5 and the reactor body. The diaphragm floor 2 is joined to the furnace containment vessel 1.

FIG. 3 shows the detailed structure of the joint between the foundation 6 of the reactor body and the diaphragm floor 2 among them.

In this structure, the diaphragm floor 2 is placed in the notch on the outer side of the top of the foundation 6 of the reactor body, and for a fixed load and a downward pressure load on the diaphragm floor,
As it is, the surface pressure is transmitted downward, and the radial lower end rebar 7 is attached to the rib plate 8 of the foundation of the reactor main body with respect to the radial load generated by the pressure load at the time of an earthquake and an accident. The structure is such that it is transmitted to the foundation of the reactor body through the

[Problems to be Solved by the Invention]

In the above-mentioned conventional technique, from the viewpoint of reinforcing work, first, it is necessary to join the lower end rebar 7 in the radial direction to the screw coupler 9 welded to the rib plate 8 of the foundation 6 of the reactor body. Has many penetrating parts such as piping, and the reinforcing bar 7
It may be bent, and there is a difficulty in joining the screw coupler 9 and the reinforcing bar 7.

Further, since the screw coupler 9 and the rib plate 8 require a large number, it is expected that the manufacturing cost will increase, and that interference with the fixing of the upper end reinforcing bar causes a notch or the like, which causes ribs. Installation of the plate 8 and the nece coupler 9 also has a difficulty.

It is an object of the present invention to improve these difficulties in the reinforcement work and the difficulties in manufacturing the rib plate and the screw coupler, and to provide a structure having a similar load transmission mechanism.

[Means for solving the problem]

Means for achieving the above-mentioned object is to provide a diaphragm floor in a joint structure between a reinforced concrete diaphragm floor that separates a reactor containment vessel into two spaces, an upper and lower drywell and a suspension, and a foundation of a steel reactor body. And put it on the notch at the top of the foundation of the reactor body,
The vertical load acting on the diaphragm floor is directly transmitted by the surface pressure, and the loads in two directions, radial and tangential, are directed upward from the top of the foundation of the reactor body between the reinforcing bars in the diaphragm floor in the two directions. This is a joint structure between the reactor containment vessel diaphragm floor and the reactor body foundation, which enables transmission between the diaphragm floor and the reactor body foundation by means of a plurality of studs provided so as to project.

[Action]

Of the loads generated at the joint between the foundation of the reactor body and the diaphragm floor, the fixed load of equipment and piping on the diaphragm floor and the downward pressure load generated at the time of an accident are the direct contact pressure from the diaphragm floor and the reactor body. The radial and tangential loads that are transmitted to the foundation of the reactor and caused by the pressure load at the time of an accident and the horizontal load at the time of an earthquake can be transmitted by the stud from the diaphragm floor to the foundation of the reactor body. In addition, the studs are rebars in the diaphragm floor in two directions, radial and tangential,
That is, since it intersects with the strength member of the diaphragm floor, the load can be reliably transmitted in the two directions.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

Figure 1 shows a reinforced concrete diaphragm floor 2.
And the joint details of the foundation 6 of the reactor body. The diaphragm from 2 is provided with radial streaks 7 and circumferential streaks 10 at the upper and lower ends, and the upper and lower ends of the radial streaks 7 are joined to the foundation side of the reactor body.

Between the radial reinforcements 7 and the circumferential reinforcements, a stud 11 that only fits the load bearing capacity of the radial and tangential loads.
The top horizontal plate 12 of the notch of the foundation 6 of the reactor body
The structure is fixed by welding on top of.

〔The invention's effect〕

According to the present invention, there is no need for a rib plate and a screw coupler for fixing radial streaks to be installed on the foundation side of the reactor body, and there is an economic merit of reducing the amount of material and man-hours such as welding work for rib manufacturing. Further, even in the case of local reinforcement work, it is possible to save the labor of joining the lower end reinforcement of the radial reinforcement to the screw coupler for welding to the foundation side of the reactor body, which leads to the rationalization of the local construction.

Also, in terms of design, for radial load transfer,
The strength can be easily increased or decreased by increasing or decreasing the stud arrangement.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a joint for transmitting a load by a stud provided with a diaphragm floor according to the present invention on a foundation of a reactor body, and FIG. 2 is a reinforced concrete diaphragm floor and a foundation of a steel reactor body. FIG. 3 is a vertical cross-sectional view of the contained reactor containment vessel, and FIG. 3 is a vertical cross-sectional view of a joint for fixing the radial rebar of the diaphragm floor according to the conventional example to the foundation of the reactor body. 1 ... Reactor containment vessel, 2 ... Diaphragm floor, 3
...... Drywell, 4 ... Suppletion Chimba, 5
…… Reactor pressure vessel, 6 …… Reactor body basics, 7 ……
Radial rebar, 8 ... rib plate, 9 ... screw coupler, 10 ... circumferential rebar, 11 ... stud, 12 ... top horizontal plate.

Claims (1)

[Claims] Claim: What is claimed is: 1. In a joint structure between a reinforced concrete diaphragm floor that separates the inside of a reactor containment vessel into two spaces, an upper and a lower dry well, and a foundation of a steel reactor main body, the diaphragm floor is the main body of the reactor. The vertical load acting on the diaphragm floor, which is placed on the notch at the top of the foundation, is directly transmitted by the surface pressure, and the radial and tangential loads are applied between the reinforcing bars in the diaphragm floor in the two directions. A plurality of studs provided so as to project upward from the top of the foundation of the reactor body enable transmission between the diaphragm floor and the foundation of the reactor body. Foundation joint structure.