JPS601457B2 - Earthquake-resistant structure of foundation for high-temperature equipment installation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earthquake-resistant structure for a foundation for installing high-temperature equipment.
The present invention relates to an earthquake-resistant structure of this type of foundation, which is suitable for installation of fast breeder reactor equipment that reaches high temperatures of up to 40,000 liters.

Figures 1 and 2 are both explanatory diagrams of the earthquake-resistant structure of foundations for various equipment footings that have been adopted in the past (however,
The figure is an explanatory diagram of the earthquake-resistant structure of the foundation for installing high-temperature equipment.

In FIG. 1, an anchor bolt 2 is buried in a foundation concrete layer 3, a base plate 1 is installed on this anchor bolt 2, and by tightening a nut 4 to the anchor bolt 2, the base plate 1 and the concrete layer 3 are and can be attached as one unit. Note that equipment not shown is installed on the base plate 1. Therefore, among the loads transmitted to the base plate 1 from the equipment installed on the base plate 1, the concrete layer 3 located at the bottom of the base plate 1 directly takes care of its own weight and the downward pressing force applied by the occurrence of an earthquake. Anchor bolt 2 takes charge of the upward pulling force.

Further, the lateral force acting on the base plate 1 is handled by the concrete layer 3 around the base plate 1. Figure 2 shows the seismic structure of the footing foundation of the high-temperature equipment in the fast breeder reactor equipment section as an example of high-temperature equipment. This assumes that there is a leak.

That is, when leaked high-temperature sodium comes into contact with the concrete floor surface, the concrete becomes crumbly due to a chemical reaction, so in order to prevent this, the entire surface of the concrete floor is covered with a liner plate 5. By the way, the leaked sodium was in a high temperature state (220~550℃).
oo) and the amount of leakage is large, the liner plate 5 and base plate 1, which are in direct contact with the sodium, are also heated to approximately the same temperature. When the liner plate 5 and the base plate are heated, the concrete layer 3 located below them is also thermally affected, and at this time, the temperature of the concrete layer 3 is 100%
It reaches ~4000C. As described above, when the concrete layer 3 is heated to a high temperature, the crystallized water contained in the concrete layer 3 evaporates, and as a result, the strength of the concrete layer 3 is reduced to approximately It can be lost to a depth of about 10 enemies. Therefore, in the past, concrete strength was not expected in the heat affected zone shown by the symbol a in FIG. 2, and by lengthening the anchor bolt 2, the anchor portion of the anchor bolt 2 was
It is buried and fixed at a position deeper than the heat affected zone a. Furthermore, in the past, the concrete floor surface was covered with a liner plate 5 as a measure against sodium leakage, but according to this structure, by laying the liner plate 5, the concrete layer around the base plate
A new problem arises that makes it extremely difficult to mold the material to a high height. Therefore, conventionally, as shown in FIG. 3, a rib 6 is provided on the lower surface of the base plate 1 to prevent the lateral force acting on the base plate from being applied to the lateral force. It is designed to absorb directional loads. Note that, as shown in FIG. 2, the rib 6 has a length that allows it to be embedded and fixed at a position deeper than the heat-affected zone a, similar to the anchor bolt 2. The present invention further improves the earthquake-resistant structure of the foundation for installing high-temperature equipment described above, and its purpose is to significantly improve the earthquake-resistance of the foundation for supporting high-temperature equipment than before. The aim is to obtain a structure of this type that can

In other words, in the earthquake-resistant structure of the foundation for installing high-temperature equipment shown in Figure 2, the area of the 4th layer of concrete 3 where strength is not expected is considered to be the heat-affected zone a, which is about 100 meters below the base plate 1 and liner plate 5. However, in reality, the heat from the base plate 1 is also transmitted to the anchor bolts 2 and ribs 6, and the concrete layer 3 located around these anchor bolts 2 and ribs 6 is also affected by the heat, reaching a considerably high temperature. is expected. As described above, when the temperature of the concrete layer 3 located around the anchor bolts 2 and ribs 6 reaches a high temperature, the crystal water contained in the concrete layer 3 evaporates, causing the concrete to lose its strength and become unstable to the installed equipment. Earthquake resistance may deteriorate. The present invention has been made in consideration of the above points.
The gist of this article is that in this type of earthquake-resistant structure for foundations in which a base plate for equipment installation is installed on top of a foundation concrete layer, the sole plate is fixed to the concrete layer via foundation bolts, and the upper sole plate and base plate are fixed to the concrete layer. - Attach the base plate and the sole plate together via a connecting bolt provided on the sole plate, and lock the base plate and sole plate together via a share key provided on both plates, and The main feature is that sand is spread between the base plate and sole plate.

Next, the present invention will be explained in detail based on the embodiments shown in FIGS. 4 and 5. The figure shows the seismic structure of the footing foundation of fast breeder reactor equipment as an example of high-temperature equipment. The same reference numerals as in FIGS. 2 and 3 indicate the same parts.

As shown in FIG. 4, the sole plate 7 located below the base plate is fixed to the concrete layer 3 via anchor bolts 8. The sole plate 7 and the base plate 1 located above the sole plate 7 are integrally attached via connecting bolts 9 provided on the sole plate 7. Further, the base plate and the sole plate 7 are locked together via a share key 10 provided on both plates, and furthermore, a sand 11 is provided between the base plate and the sole plate 7. is covered. Here, FIG. 5 shows the arrangement of the share key 10 protruding from the lower surface of the base plate 1, taken along the line BB in FIG. 4 in the direction of the arrow. In the above configuration, among the loads transmitted to the base plate 1 from the equipment (not shown) installed on the base plate 1, the downward pressing force applied by its own weight and the occurrence of an earthquake is transferred to the sole plate through the sand 11. 7 and concrete layer 3 take charge.

If an accident occurs at a fast breeder reactor plant and a large amount of high-temperature sodium leaks, this high-temperature sodium will accumulate on the base plate, but since sand 11 is spread directly under the base plate, Due to the heat storage effect of this sand 11, the high heat of the leaked sodium is not transmitted to the concrete layer 3.

As a result, the crystallized water contained in the concrete layer 3 is prevented from evaporating, and the strength of the concrete layer 3 is not lost, so that the sole plate 7 fixed to the Z concrete layer 3 and even the sole The supporting function of the anchor bolt 8 provided at the lower part of the plate 7 is not impaired. When an earthquake occurs and a lateral force acts on the base plate 1, this lateral force is transmitted to the sole plate 7 side via the share key 10 provided on both the Z base plate and the sole plate 7. However, as mentioned above, the strength of the concrete layer 3 is not lost, and the sole plate 7 stabilizes the lateral load applied to the base plate 1 because it is firmly fixed to the concrete layer 3. can be accepted. Note that the number of shared keys 10 to be attached is determined based on the expected magnitude of lateral load. Further, according to the present invention, the concrete layer 3 is not located directly below the base plate and the liner plate 5, but the sand 11 is spread in the middle, so that the concrete layer 3 is not located directly below the base plate and the liner plate 5. If the surrounding concrete layer 3 is formed high, the lateral force applied to the base plate 1 and thus the sole plate 7 can be more stably received. on the other hand,
The upward pulling force applied to the base plate is transmitted to the sole plate 7 via the connecting bolt 9, but at this time, the anchor bolt 8 is firmly fixed to the concrete layer 3 which has not lost its strength. Therefore, the base plate 1 can in turn resist the upward pulling force applied to the sole plate 7. In addition, base plate 1
is heated by heat transfer from the supporting equipment, not only during sodium leakage but also during normal plant operation.
Although each share key 10 provided on the base plate 1 expands thermally, each share key 10 provided on the base plate 1 moves in the direction of expansion (in the direction of the arrow in FIG. 5) as the base plate expands. No high stress is generated at the base of the share key 10 provided on both sides.

Furthermore, if the amount of thermal expansion of the base plate 1 is large, the connecting bolt 9 will also become pulped, but since the sand 11 is spread all over the bolt 9, the bolt 9
1 can be displaced according to the amount of thermal expansion of the base plate 1. Therefore, when the base plate 1 thermally expands, the deformation of the connecting bolts 9 is not restricted, and no large shear stress is generated between the bolts 9 and the base plate 1. Note that the same thing can be said when the base plate 1 that has been heated for a day returns to room temperature. As detailed above, according to the present invention,
It is possible to provide this type of structure with excellent reliability, which can significantly improve the seismic resistance of a foundation for supporting high-temperature equipment compared to the conventional one.

[Brief explanation of the drawing]

Figures 1 and 2 are both explanatory diagrams of the earthquake-resistant structure of foundations for various equipment footings that have been adopted in the past (however,
The figure is an explanatory diagram of the earthquake-resistant structure of the foundation for installing high-temperature equipment), Figure 3 is a sectional view taken along line A-A in Figure 2, and Figure 4 is an earthquake-resistant structure of the foundation for supporting high-temperature equipment, showing an embodiment of the present invention. The structure explanatory diagram, FIG. 5, is a sectional view taken along the line BB in FIG. 4. DESCRIPTION OF SYMBOLS 1...Base plate for equipment installation, 3...Foundation concrete layer, 4...Nut, 5...Liner plate, 7...Sole plate, 8...Anchor bolt, 9...Connection bolt, 10...
Share key, 11...sand. Younger brother's figure 2 figure 3 figure 4 figure 5

Claims (1)

[Claims] 1. In the earthquake-resistant structure of a foundation for high-temperature equipment installation, in which a base plate for equipment installation is installed on top of a foundation concrete layer, a sole plate is fixed to the concrete layer via foundation bolts, and the sole plate and base plate are connected to each other. The base plate and the sole plate are fixed together via a connecting bolt provided on both plates, and sand is spread between the base plate and the sole plate. An earthquake-resistant structure for the foundation for installing high-temperature equipment.