JPH0621967Y2 - Basic structure of reactor building - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a basic structure of a reactor building with improved stability.

[Prior art]

The conventional reactor building 1 shown in FIG. 1 and FIG. 2 has a mat slab type foundation plate 2, and although the ground contact pressure is small, it is easily lifted by groundwater during an earthquake. Therefore, the foundation plate 2 was made thicker and heavier so as to improve stability such as earthquakes. Also, because of the solid foundation, buoyancy due to groundwater was also large.

Subdrain 3 as shown in Fig. 3 was used for draining groundwater. The subdrain 3 is a porous pipe buried in sand, and groundwater flowing into the pipe is collected in a water collection pipe 4 and pumped up from a water collection pit arranged at an appropriate position.

However, it is almost impossible to repair the sub-drain 3 after construction, and it is desirable to use drainage equipment that does not use the sub-drain 3 as much as possible.

[Purpose of device]

The present invention was made to solve the above problems, and the weight of the foundation part is light while the stability against the foundation rise such as an earthquake is increased, the construction cost can be reduced, and it is received by groundwater. It is an object of the present invention to provide a reactor building having a structure capable of reducing buoyancy and having a drainage function which is not deteriorated with age in an underground drainage ditch.

[Constitution of device]

The basic structure of the reactor building according to the present invention is such that the central part has an annular shape on the lower surface of the foundation plate, and the peripheral part forms a grid-shaped projecting part, and the ground contact area between the projecting part lower surface and the ground is the outer peripheral part of the building. In order to achieve the above object, the concave portions are formed on the lower surface of the base plate with the distance between the concave portions between the ridges and the space between the concave portions and the ground is an underground drainage groove.

〔Example〕

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

In the figure, reference numeral 1 is a reactor building, in which a reactor 6 is housed in a central reactor containment vessel 5.

Reference numeral 2 denotes a foundation plate buried in the ground. On the lower surface of the foundation plate 2, an annular projection portion 11 is formed in the central portion below the reactor 6, and a grid-shaped projection portion 8 is formed in the peripheral portion. The base plate 2 has a concave portion 7 with a concave portion interval between each of the ridges 11 and 8.
Are formed. That is, the thickness of the base plate 2 is set to be substantially the same as the conventional one, and the concave portion 7 is provided on the lower surface to reduce the thickness of the portion where the concave portion 7 is formed. The portion where the recess 7 is not formed protrudes to the lower surface as the ridges 11 and 8, and only the lower surface of the ridges 8 and 11 is grounded to the ground 9 such as rock. The ridges 8 and 11 are formed so as to concentrate under the wall of the building and ensure the proof strength against an earthquake. In addition, the bottom surface of the foundation plate and the ground are formed at appropriate intervals such that the contact area between the bottom surface and the ground increases at the outer peripheral portion of the building. That is, the width W ₁ of the peripheral concave portion 7 is smaller than the width W ₂ of the central concave portion 7.

Since the recess 7 of the foundation plate 2 is not in contact with the ground 9, the recess 7
A space is formed between the ground and the ground 9, and this space serves as an underground drainage channel 10. Groundwater flows out into the underground drainage channel 10, but the groundwater is drained into the water collecting pipe through the sub-drain installed under the ridges 8 and 11, and pumped up to the ground portion. Therefore, the buoyancy of the groundwater is received only by the lower surfaces of the ribs 8 and 11, and the subdrain is disposed only under the ribs 8 and 11 to drain the groundwater. Therefore, the total installation length is extremely short, the possibility of clogging is reduced accordingly, and the drainage function is not significantly deteriorated even with age.

[Effect of device]

Since the present invention has the above-mentioned configuration, the following effects can be obtained.

B. Since the recess is formed between the ridges on the bottom surface of the foundation plate, the foundation portion is thinned accordingly, and the construction cost is reduced.

(2) Only the lower surface of the ridge is in contact with the ground, and the portion affected by buoyancy due to groundwater is reduced.

C Because the ground contact area on the bottom surface of the foundation plate is often the outer periphery of the building,
Even if the bottom surface has a recess, it can withstand the falling moment of the building.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a conventional reactor building, FIG. 2 is a bottom view thereof, FIG. 3 is an explanatory view of a sub-drain, FIG. 4 is a vertical sectional view of a reactor building according to the present invention, and FIG. Is a bottom view thereof. 1 ... Reactor building, 2 ... Basic version, 3 ... Sub drain, 4 ... Water collecting pipe, 5 ... Reactor containment vessel, 6 ... Reactor, 7 ... Recess, 8
... ridges, 9 ... ground, 10 ... underground drainage, 11 ... ridges.

Claims (1)

[Scope of utility model registration request] 1. A slab having a ring-shaped central part and a lattice-shaped periphery is formed on the lower surface of the foundation plate, and the ground contact area between the lower surface of the ridge and the ground is increased at the outer peripheral portion of the building A basic structure of a reactor building, characterized in that recesses are formed on the lower surface of the foundation plate with intervals between the projections, and the space between the recesses and the ground is an underground drainage groove.