JPH0549079B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a concrete shear wall that also serves as a shielding wall in a nuclear reactor building or the like.

[Conventional technology]

Various types of nuclear reactors have been developed and
The structure, equipment, layout, etc. inside and outside the building differ depending on the type, but reactor buildings usually have very thick concrete walls around the reactor or containment vessel. A shielding wall and earthquake-resistant wall has been installed.

In addition, strict standards will be established regarding the location conditions for nuclear reactors, and they will be constructed on solid ground.

Conventionally, many of the techniques for increasing the seismic resistance of shielding walls in nuclear reactor buildings have involved devising reinforcement arrangement and methods of introducing prestress.

Furthermore, in the construction of general high-rise buildings, structures are known in which slits are provided in seismic walls to reduce bending rigidity, thereby increasing the natural period of the building and thereby reducing earthquake response. Improvements have been made.

[Problem that the invention seeks to solve]

Conventional methods for increasing the rigidity of shear walls in nuclear reactor buildings, etc., increase the bending rigidity of the shear walls, but at the same time shorten the building's natural period, making it difficult for reactor buildings installed on hard rock to respond in an earthquake. growing.

However, when a slit is provided in a heat-resistant wall, the shear area is inevitably reduced, resulting in insufficient shear rigidity.

Furthermore, the seismic wall that also serves as a shielding wall around the reactor must maintain a shielding function against radiation, etc., and normal straight slits cannot be used.

The shear wall with slits of the present invention aims to solve the above-mentioned problems.

[Means to solve the problem]

The seismic wall with slits of the present invention has vertical slits 2 formed at predetermined intervals in a concrete seismic wall 1 which also serves as a radiation shielding wall. The slits 2 can control the rigidity of the shear wall 1 and lengthen the natural period of the shear wall 1 and, by extension, the building as a whole. Therefore, it is possible to significantly reduce the seismic response to earthquake motions with many short-period components, especially in hard ground.

Further, the cross section of each slit 2 is bent or curved to maintain a shielding function against radiation and the like. The cross-sectional shape of the slit 2 may be a dogleg shape, an arc shape, a sawtooth shape, or other various shapes, as long as the shape does not allow straight radiation to leak to the outside of the seismic wall 1.

Furthermore, in the present invention, the surface of such a bent or curved slit 2 is connected to a pair of steel reinforcing plates 3 and a steel connecting member 4 that connects the upper and lower sides of the seismic wall 1 in the thickness direction of the seismic wall 1. This reinforcement prevents a decrease in shear rigidity and compensates for the shape disadvantages of the bent or curved slit 2.

〔Example〕

Next, the illustrated embodiment will be described.

FIG. 4 shows an example of a nuclear reactor building 6 to which the seismic wall of the present invention is applied, and is used, for example, as a shielding wall around a reactor pressure vessel 7.

FIGS. 1 and 2 show an example of the shape of a slit 2 provided in a seismic wall 1, and FIG. 3 shows a longitudinal section of a main part thereof.

In this embodiment, the cross section of the slit 2 is made into a dogleg shape to maintain the shielding function. The surface of this slit 2 is reinforced across the thickness direction of the seismic wall 1 with a pair of reinforcing plates 3 bent in a dogleg shape, and a reinforcing member 4 connecting the upper and lower parts of both reinforcing plates 3. .

A steel plate is used as the reinforcing plate 3, and if necessary, stud bolts or the like are attached as anchors 5 for fixing to concrete as shown in FIG. The upper and lower connecting members 4 may be made of cast steel, and by transmitting the shear force acting on the shear wall 1 from one reinforcing plate 3 to the other reinforcing plate 3, the left and right forces are reduced in the connecting members 4. By balancing these, it is possible to compensate for the lack of shear cross-sectional area due to the slit 2.

5 to 7 show cross sections of the slit 2 as other embodiments.

FIG. 5 shows a case where the slit 2a is curved in an arcuate shape, and is reinforced by an arcuate reinforcing plate 3a. Further, in FIGS. 6 and 7, the slits 2b and 2c are bent at two places, respectively, so that the shielding function is maintained.

[Effects of the Invention] By providing slits in the concrete shear wall that also serves as a shielding wall, the steel properties can be controlled. In particular, with regard to the shear walls for reactor buildings, which have large wall thicknesses and tend to have a large response to short-period seismic motions, by controlling the building to the optimal rigidity according to the hardness of the rock in which it is installed, Seismic response can be reduced.

The cross section of the slit is bent or curved to maintain the radiation shielding function.

By reinforcing the surface of the slit with a steel reinforcing plate or reinforcing member, it is possible to prevent a decrease in shear rigidity due to the slit.

By covering the surface of the slit with a steel reinforcing plate or reinforcing member, it is possible to compensate for manufacturing and structural disadvantages caused by bending or curving the cross-sectional shape.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an example of the shear wall of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a vertical cross-sectional view of the main part, and Fig. 4 is a longitudinal cross-sectional view showing an example of a building to which the present invention is applied. 5, 6, and 7 are cross-sectional views showing other embodiments. 1... Earthquake wall, 2... Slit, 3... Reinforcement plate, 4... Connecting member, 5... Anchor, 6... Reactor building, 7... Pressure vessel.

Claims (1)

[Scope of Claims] 1. Slits in the vertical direction are formed at predetermined intervals in a concrete seismic wall that also serves as a shielding wall, and the cross section of the slits is bent or curved, and the surface of the slits is A seismic wall with slits, characterized in that the seismic wall is reinforced in its thickness direction by a pair of steel reinforcing plates and a steel connecting member that connects the upper and lower parts of the reinforcing plates. 2. The shear wall with slits according to claim 1, wherein the cross section of the slits is bent in a dogleg shape. 3. The shear wall with slits according to claim 1, wherein the slit cross section is curved in an arc shape.