JP6862523B2 - Impact reduction structure and power plant - Google Patents

Description

The present invention relates to a shock reduction structure and a power plant.

The factory or business establishment where the power reactor is installed will be equipped with equipment that needs to be protected from collisions with external flying objects such as large aircraft (hereinafter referred to as "protected equipment"). As an example of this equipment, there is a "facility for dealing with specific serious accidents".

This equipment to be protected refers to a facility that has a function to deal with an accident that may lead to a serious accident or a serious accident, and when there is a risk of significant damage to the core due to intentional collision of a large aircraft or other terrorism. Alternatively, in the event of significant damage to the core, the purpose is to suppress the release of an abnormal level of radioactive material to the outside of the factory due to damage to the reactor containment vessel. The equipment to be protected is a large facility consisting of pumps, filters, generators, fuel tanks, emergency control rooms, etc.

The equipment to be protected shall be (1) that there is no risk of impairing the functions necessary to deal with serious accidents, etc. due to intentional collision of a large aircraft with the reactor building or other terrorism (2). ) Must have the necessary equipment to prevent damage to the reactor containment vessel, (3) After a deliberate collision of a large aircraft with the reactor building or other terrorism, outside the reactor facility for power generation It is required to be usable until it receives support from.

The invention described in Patent Document 1 below refers to a building structure in a reactor building in order to withstand impacts from external flying objects, maintain safety functions and soundness, and improve earthquake resistance. It is characterized in that the roof structures are separated from each other and the foundation structures are independent of each other.

Japanese Unexamined Patent Publication No. 2011-252800

It is necessary to prevent the equipment to be protected from being damaged at the same time as the reactor building so that the functions necessary for dealing with serious accidents are not impaired. As shown in FIG. 21, when the protected equipment 10 is installed on the ground, the protected equipment 10 is located on the same straight line as the reactor building 30, so that the flying object 11 such as an aircraft is located in the reactor building 30. After the collision, there is a high possibility that the equipment to be protected 10 will also collide and the necessary functions will be impaired.

Therefore, as shown in FIG. 22, it is conceivable to prevent the flying object 11 such as an aircraft from colliding with the protected equipment 10 by installing the protected equipment 10 underground. However, the impact force generated when the flying object 11 collides with the ground propagates to the protected equipment 10. Therefore, it is necessary to take measures so that the impact force propagated to the protected equipment 10 does not impair the functions required for dealing with a serious accident or the like in the protected equipment 10.

The present invention has been made in view of such circumstances, and is capable of reducing the propagation of an impact force generated by a collision of an object such as an aircraft with respect to a building installed underground. The purpose is to provide a structure and a power plant.

In order to solve the above problems, the impact reduction structure and the power plant of the present invention employ the following means.
The impact reduction device according to the reference example of the present invention is an impact reduction device having a configuration for reducing an impact force generated by a collision of an object and propagated to a building buried in the ground. It is provided above and has a pool where water is stored.

According to this configuration, even if an object (for example, a flying object such as an airplane) tries to collide with a building buried in the ground, the object will be in the pool before reaching the building. Rush into the stored water. Further, when an object rushes into water, the viscous resistance and buoyancy of the water decelerate the object, and the impact force at the time of collision of the object can be alleviated. As a result, it is possible to reduce the propagation of the impact force generated by the collision of an object such as an aircraft with respect to a building buried in the ground.

The impact reduction device according to the reference example of the present invention is an impact reduction device having a configuration for reducing an impact force generated by a collision of an object and propagated to a building buried in the ground, and is above the building. A member having viscoelastic properties, one end of which is connected to the upper surface of the building and the other end of which is connected to the lower surface of the plate.

According to this configuration, when an object collides with the ground, the impact force generated immediately after the collision with a large force for a short period of time is absorbed by the inertial force due to the mass of the plate material, and the force generated thereafter is small and for a long time. The impact force of is absorbed by the damping force exerted by the member having the viscoelastic property. As a result, it is possible to reduce the propagation of the impact force generated by the collision of an object such as an aircraft with respect to a building buried in the ground.

The impact reduction device according to the reference example of the present invention is an impact reduction device having a configuration for reducing an impact force generated by a collision of an object and propagated to a building buried in the ground, and is an upper surface of the building. The panel material is provided in the building and has a material having a damping characteristic, and the panel material is installed obliquely with respect to the upper surface of the building.

According to this configuration, since the panel material is installed diagonally with respect to the upper surface of the building, the distance for the impact force to propagate in the panel material becomes long, and the panel material is a material having damping characteristics. Have. As a result, it is possible to reduce the propagation of the impact force generated by the collision of an object such as an aircraft with respect to a building buried in the ground.

The power plant according to the reference example of the present invention includes the above-mentioned impact reduction device.

The impact reduction structure according to the reference example of the present invention is an impact reduction structure having a structure for reducing an impact force generated by a collision of an object and propagated to a building buried in the ground, and is above the building. The lightweight soil provided in the above, and the soil provided on the upper surface of the lightweight soil and having a higher density than the lightweight soil are provided.

According to this configuration, when an object collides with the ground, the soil having a higher density than the lightweight soil prevents the object from sinking into the ground, and the lightweight soil is deformed to reduce the impact energy. Further, the stress wave generated by the impact is reflected at the interface between the high-density soil and the lightweight soil, and the stress wave transmitted through the soil can be reduced.

The impact reduction structure according to the present invention is an impact reduction structure having a structure for reducing an impact force generated by a collision of an object and propagated to a building buried in the ground, and is provided above the building. comprising lightweight soil and density is lower than normal soil, provided on the upper surface of the lightweight soil, the stiffness rather higher than lighter soils, and a metal plate that is set to a thickness which is not penetrated by the impact force with ..

According to this configuration, when an object collides with the ground, a metal plate having a higher rigidity than lightweight soil prevents the object from sinking into the ground, and the lightweight soil is deformed to reduce impact energy. Further, the stress wave generated by the impact is reflected at the interface between the high-density soil and the lightweight soil, and the stress wave transmitted through the soil can be reduced.

The power plant according to the present invention has the above-mentioned impact reduction structure.

According to the present invention, it is possible to reduce the propagation of the impact force generated by the collision of an object such as an aircraft with respect to a building installed underground.

It is a vertical sectional view which shows the impact reduction apparatus which concerns on 1st reference embodiment of this invention. It is a vertical cross-sectional view which shows the 1st modification of the shock reduction apparatus which concerns on 1st reference embodiment of this invention. It is a vertical cross-sectional view which shows the 2nd modification of the impact reduction apparatus which concerns on 1st reference embodiment of this invention. It is a vertical cross-sectional view which shows the 3rd modification of the impact reduction apparatus which concerns on 1st reference embodiment of this invention. It is a vertical sectional view which shows the 4th modification of the impact reduction apparatus which concerns on 1st reference embodiment of this invention. It is a vertical sectional view which shows the 5th modification of the impact reduction apparatus which concerns on 1st reference embodiment of this invention. It is a top view which shows the wall part of the 5th modification of the impact reduction apparatus which concerns on 1st reference embodiment of this invention. It is a vertical sectional view which shows the impact reduction apparatus which concerns on 2nd reference embodiment of this invention. It is a graph which shows the time history change of the impact force propagated to the equipment to be protected. It is a vertical cross-sectional view which shows the 1st modification of the impact reduction apparatus which concerns on 2nd reference embodiment of this invention. It is a cross-sectional view and a side view after deformation which shows the impact reduction apparatus which concerns on 2nd reference embodiment of this invention. It is a vertical cross-sectional view which shows the 2nd modification of the impact reduction apparatus which concerns on the 2nd reference embodiment of this invention. It is a perspective view which shows the 2nd modification of the impact reduction apparatus which concerns on the 2nd reference embodiment of this invention. It is a vertical sectional view which shows the impact reduction apparatus which concerns on 3rd reference embodiment of this invention. It is a partially enlarged vertical sectional view which shows the impact reduction apparatus which concerns on 3rd Reference Embodiment of this invention. It is a partially enlarged vertical sectional view which shows the impact reduction apparatus which concerns on 3rd Reference Embodiment of this invention. It is a partially enlarged vertical sectional view which shows the 1st modification of the impact reduction apparatus which concerns on 3rd reference embodiment of this invention. It is a graph which shows the time history change of acceleration. It is a vertical sectional view which shows the impact reduction apparatus which concerns on 1st Embodiment of this invention. It is a vertical sectional view which shows the 1st modification of the impact reduction apparatus which concerns on 1st Embodiment of this invention. It is a side view which shows the power reactor building and the equipment to be protected installed on the ground. It is a side view which shows the power reactor building and the equipment to be protected installed in the ground.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
[First Reference Embodiment]
The impact reduction device 1 according to the first reference embodiment of the present invention is, for example, as shown in FIG. 1, equipment that needs to be protected from collisions with external flying objects such as large aircraft (hereinafter, “equipment to be protected 10””. It is provided in association with). The equipment to be protected 10 is installed in a power plant 31 such as a factory or a business establishment where a reactor building 30 in which a power reactor is installed is built. As an example of the equipment to be protected 10, there is a “specific serious accident handling facility”. The protected equipment 10 is installed underground. A factory or business establishment in which a power reactor is installed is an example of a power plant, and the power plant according to the present invention may be a plant in which power generation equipment other than the power reactor is installed.

The impact reduction device 1 according to the reference embodiment can reduce the impact force generated when a flying object 11 such as an aircraft collides and propagated to the protected equipment 10 buried in the ground. ..

As shown in FIG. 1, the impact reduction device 1 has a pool 5 in which water is stored, and is provided above the equipment to be protected 10. The pool 5 is provided in a size and position that can prevent the flying object 11 from colliding with the equipment 10 to be protected in the ground. For example, the pool 5 is provided on the flying line of the flying object 11 toward the protected equipment 10. Further, the pool 5 has an area equal to or larger than the plan view shape of the protection target equipment 10 so as to cover the plan view shape of the protection target equipment 10. In consideration of the flying conditions and collision conditions of the flying object 11, the pool 5 does not necessarily have to be provided on the flying line toward the protected equipment 10 in all parts, and the plane of the protected equipment 10 may be provided. It does not have to have a larger area than the visual shape.

By providing the pool 5 described above, even when the flying object 11 tries to collide with the protected equipment 10, the flying object 11 is stored in the pool 5 before the flying object 11 reaches the protected equipment 10. Rush into the water. When the flying object 11 rushes into water, the flying object 11 is decelerated by the viscous resistance and buoyancy of the water, and the impact force at the time of collision of the flying object 11 can be alleviated. As a result, it is possible to reduce the propagation of the impact force generated by the collision of the flying object 11 such as an aircraft with respect to the protected equipment 10 buried in the ground. Then, the impact force input to the protected equipment 10 can be greatly reduced.

The water stored in the pool 5 functions as a protective wall against the equipment to be protected 10 because it becomes relatively hard due to the resistance of the water to the flying object 11 flying at a high speed. Further, for a flying object 11 having a small mass with respect to a volume such as an aircraft, a high buoyancy acts due to the water in the pool 5. Therefore, the rushing direction of the flying object 11 can be changed, the impact force at the time of collision can be absorbed, and the protective effect is large.

Further, the water in the pool 5 can prevent the spread of fire against a fire caused by a collision of a flying object 11 equipped with an engine containing fuel such as an aircraft. Further, since the ground of the land where the power reactor is installed is strong in the first place, burying the equipment to be protected 10 deep underground poses a problem of cost and construction period. On the other hand, by providing the pool 5 above the protected equipment 10, the burial depth can be made shallow, and the cost and construction period required for the construction of the protected equipment 10 can be reduced.

As shown in FIG. 2, inside the pool 5, for example, a structure 6 in which plate materials are combined in a grid pattern may be installed in a portion where water is stored. Sloshing may occur in the pool 5 due to the input of an external force such as a long-period ground motion, but the installation of the structure 6 can prevent the occurrence of sloshing. The structure 6 for which sloshing is prevented in the pool 5 can be applied with a technique usually used, and is not limited to the lattice-shaped structure, and may be, for example, a perforated plate.

The pool 5 has a wall portion 7 and a bottom portion 8, and the wall portion 7 may be completely embedded in the ground in the height direction, or is provided so that a part thereof protrudes from the ground and the rest portion is embedded. You may. As shown in FIG. 3, when the pool 5 is installed so that a part of the wall portion 7 protrudes from the ground, for example, on the outside of the wall portion 7, up to the uppermost portion of the protruding portion of the wall portion 7. Filling 9 may be applied. As a result, when the flying object 11 comes flying toward the side of the pool 5, the distance of the underground part to the protected equipment 10 can be increased, and the impact force propagated to the protected equipment 10 can be further increased. Can be reduced.

Even when the pool 5 is installed so that the entire wall portion 7 is embedded, a roof or the like may be provided in the pool 5 and an embankment may be provided on the upper portion thereof. Even in this case, the distance of the underground portion to the protected equipment 10 can be increased, and the impact force propagated to the protected equipment 10 can be reduced. Further, in order to hide the exposed portion of the pool 5 from the ground, a wire mesh or the like may be provided and covered with vegetation or the like. This makes it difficult to identify the position of the protected equipment 10 buried in the ground from the ground or the sky.

Further, as shown in FIG. 4, the bottom portion 8 of the pool 5 may be covered with the cushioning material 12 over the entire surface. The cushioning material 12 is, for example, a material having a porous material, and is a foamed synthetic resin such as polyurethane foam, a foamed metal (for example, Celmet (registered trademark)), or the like. When the flying object 11 collides with the pool 5, the cushioning material 12 provided on the bottom 8 is crushed, and the generated impact force is alleviated.

The volume of water stored in the pool 5 is set so that the water stored in the pool 5 can appropriately exert its buffering performance in the event of a collision of the flying object 11. For example, the volume of water stored in the pool 5 is determined based on the flying conditions of the flying object 11, the magnitude of the impact force to be buffered, and the like. As shown in FIG. 5, a scale line 13 indicating a water depth that can secure a predetermined volume of water may be provided on the inner surface of the wall portion 7 of the pool 5. This makes it easier to check whether or not a predetermined volume of water is secured in the pool 5 with the scale line 13 as a guide. Therefore, security management related to securing the volume of the pool 5 becomes easy.

In the above-described reference embodiment, the wall portion 7 may be formed of the same material and the same thickness over the entire circumference, and as shown in FIG. 6, a part of the wall portion 7 may be formed in addition to the wall portion 7. A fragile portion 14 that is more easily destroyed than the portion of the above may be provided.

As shown in FIG. 7, the fragile portion 14 has a structure that is thinner than the other portions of the wall portion 7, and is more likely to be destroyed before the other portions when the flying object 11 collides. There is. As a result, when the flying object 11 collides with the pool 5, the vulnerable portion 14 of the wall portions 7 is destroyed first. As a result, the impact force generated in the pool 5 is diffused because the water escapes from the fragile portion 14 where the water is destroyed. Therefore, the impact force propagated to the protected equipment 10 can be further reduced.

[Second Reference Embodiment]
Next, the impact reduction device 2 according to the second reference embodiment of the present invention will be described.
The impact reduction device 2 according to the second reference embodiment of the present invention is an impact force generated when a flying object 11 such as an aircraft collides with the ground and propagated to a protected equipment 10 buried in the ground. Can be reduced.

As shown in FIG. 8, the impact reduction device 2 is installed on the upper surface of the equipment to be protected 10 in the ground. The impact reduction device 2 includes, for example, a base plate 15 having a metal material such as a steel plate, and a mount 16 having damping performance while supporting the base plate 15.

The base plate 15 has an area equal to or larger than the plan view shape of the protection target equipment 10 so as to cover the plan view shape of the protection target equipment 10. The base plate 15 preferably has a mass equal to or greater than a predetermined value, and the predetermined value is, for example, 10 times the mass of the colliding object.

The mount 16 is made of a material having viscoelastic properties such as rubber and synthetic resin. One end of the mount 16 is connected to the upper surface of the equipment to be protected 10, and the other end is connected to the lower surface of the base plate 15.

It is desirable that the shock reduction device 2 having the base plate 15 and the mount 16 has a natural frequency of 2 Hz or less.

As shown in FIG. 9, the impact reduction device 2 has the above-described configuration, and when a flying object 11 such as an aircraft collides with the ground, the impact force generated immediately after the collision is large and short. It is absorbed by the inertial force due to the mass of the base plate 15, and the impact force generated thereafter with a small force for a long time is dampened by the material having the viscoelastic property of the mount 16. As a result, it is possible to reduce the propagation of the impact force generated by the collision of the flying object 11 such as an aircraft with respect to the protected equipment 10 buried in the ground. As a result, the soundness of the equipment to be protected 10 can be easily maintained.

Since the base plate 15 has a mass of 10 times or more the mass of the colliding object, the inertial force effect is exhibited when a large impact force acts on the base plate 15. Further, since the natural frequency of the impact reduction device 2 having the base plate 15 and the mount 16 is 2 Hz or less, the impact force of a high frequency is not propagated from the viewpoint of the dynamic response magnification.

The base plate 15 may be formed of a single metal material, or as shown in FIG. 10, the base plate 15 is sandwiched between the two metal plates 17 and the two plates 17. A configuration having a cushioning material 18 may be used. The cushioning material 18 is, for example, a material having a porous material, and is a foamed synthetic resin such as polyurethane foam, a foamed metal (for example, Celmet (registered trademark)), or the like. If the cushioning material 18 is made of synthetic resin instead of metal, performance deterioration due to corrosion can be prevented.

When the impact force is propagated to the base plate 15, the cushioning material 18 sandwiched between the two plate members 17 is crushed, the impact energy is absorbed, and the impact force propagated to the equipment to be protected 10 is relaxed. To. Further, since the force is dispersed by the cushioning material 18, it is possible to prevent the impact reduction device 2 from being locally destroyed.

By having the cushioning material 18 sandwiched between the two plate members 17 in this way, the impact force propagated to the protected equipment 10 is alleviated by the cushioning effect of the cushioning material 18, and the equipment to be protected is protected. The soundness of 10 is easily maintained.

Further, in the base plate 15 described above, a plurality of metal pipe members 19 may be provided instead of the cushioning material 18, as shown in FIGS. 12 and 13. The pipe material 19 is, for example, a steel pipe, an aluminum pipe, or the like, and is provided in the axial direction parallel to the vertical direction. The pipe material 19 has a strength and a structure that can be crushed by an impact force from the outside. Also in this case, when the impact force is propagated to the base plate 15, the pipe material 19 sandwiched between the two plate members 17 is crushed, the impact energy is absorbed, and the impact force propagated to the equipment to be protected 10. Is relaxed. Further, since the force is dispersed by the pipe material 19, it is possible to prevent the impact reduction device 2 from being locally destroyed.

A plurality of mounts 16 are installed between the upper surface of the base plate 15 and the upper surface of the equipment to be protected 10. The number of mounts 16 is determined in relation to the strength of each mount 16 so as to support the mass of the base plate 15. The mounts 16 may be evenly arranged on the entire surface of the base plate 15 as shown in FIG. 11 (a), or only at the corners of the base plate 15 or as shown in FIG. 11 (c). , As shown in FIG. 11 (e), only the portion along each side may be arranged.

When the mounts 16 are evenly arranged, the shape of the base plate 15 when the impact force is propagated remains a flat plate as shown in FIG. 11 (b). On the other hand, when the mount 16 is arranged only at the corner of the base plate 15 or only the portion along each side, the impact force is applied to the base plate 15 as shown in FIGS. 11D and 11F. When propagated to, the base plate 15 bends in a portion not supported by the mount 16 on the side opposite to the impact force input side. Then, the impact energy can be absorbed and the impact force can be attenuated by the bending deformation of the base plate 15.

[Third Reference Embodiment]
Next, the impact reduction device 3 according to the third reference embodiment of the present invention will be described.
The impact reduction device 3 according to the third reference embodiment of the present invention is an impact force generated when a flying object 11 such as an aircraft collides with the ground and propagated to a protected equipment 10 buried in the ground. Can be reduced.

As shown in FIG. 14, the impact reduction device 3 is installed on the upper surface of the equipment to be protected 10 in the ground. The impact reduction device 3 includes a roof 20 composed of a panel material 21 having a material having damping characteristics.

The panel material 21 is a material having high damping performance such as a high damping ability material, a vibration damping alloy, and a composite material. Here, the high damping performance refers to a characteristic of damping the amplitude of acceleration in a short time as compared with a general structural material such as a steel material. By using a material having high damping performance for the panel material 21, the impact force propagated to the equipment to be protected 10 can be reduced by damping. The graph shown in FIG. 18 shows an example in which the damping characteristic of a material having high damping performance is higher than that of a steel material.

The panel material 21 may be a flat plate-shaped plate material or a corrugated plate-shaped plate material. Further, the panel material 21 may be formed of a single material, or may be formed by combining a plurality of materials.

The panel material 21 is installed obliquely with respect to the horizontal upper surface of the equipment to be protected 10. That is, the panel material 21 is arranged at an angle with respect to the vertical direction as well. A plurality of panel members 21 are combined to form, for example, a mountain shape or a corrugated shape.

By having the above-described configuration, the panel material 21 has a longer force propagation length from the upper end to the upper surface of the equipment to be protected 10 as compared with the case where the panel material is provided parallel to the vertical direction (FIG. 15). As a result, the impact force propagated to the protected equipment 10 can be reduced by damping.

Further, on the upper surface of the panel material 21 installed diagonally, the panel material 22 whose plate surface is installed in the horizontal direction may be provided. The panel material 22 is a material having high damping performance like the panel material 21. Further, the panel material 22 may be a flat plate-shaped plate material or a corrugated plate-shaped plate material. Further, the panel material 22 may be formed of a single material, or may be formed by combining a plurality of materials.

When an impact force is input to the panel material 22, a portion of the panel material 22 that is not supported by the panel material 21 bends to the side opposite to the impact force input side, as shown in FIG. Then, the impact energy can be absorbed and the impact force can be attenuated by the bending deformation of the panel material 22. Further, since the panel material 21 installed diagonally has low rigidity against the impact force acting in the vertical direction, the panel material 21 can be bent and deformed to absorb the impact energy and attenuate the impact force. it can.

In the above-described configuration, as shown in FIG. 17, the cushioning material 23 may be provided between the lower surface of the panel materials 21 and 22 and the upper surface of the equipment to be protected 10. The cushioning material 23 is, for example, a material having a porous material, and is a foamed synthetic resin such as polyurethane foam, a foamed metal (for example, Celmet (registered trademark)), or the like. If the cushioning material 23 is made of synthetic resin instead of metal, performance deterioration due to corrosion can be prevented.

When the impact force is propagated to the panel materials 21 and 22, the cushioning material 23 arranged on the lower surface of the panel materials 21 and 22 is crushed, the impact energy is absorbed, and the impact force propagated to the equipment to be protected 10 is applied. It will be relaxed. Further, since the force is dispersed by the cushioning material 23, it is possible to prevent the impact reduction device 3 from being locally destroyed.

The compressive strength of the cushioning material 23 is set to be a strength that can withstand the mass of soil located above the impact reducing device 3, that is, ρ × h or more. Here, ρ: soil density, h: burial depth of the impact reduction device 3 (see FIG. 14). As a result, the cushioning material 23 is not deformed in the normal time when the impact force is not propagated, and is deformed only when the impact force is propagated.

Further, the bending rigidity of the horizontally arranged panel material 22 is set to be equal to or less than the compressive strength of the cushioning material 23. As a result, the panel material 22 is more easily deformed than the cushioning material 23, and the cushioning material 23 absorbs the force generated by the deformation of the panel material 22. Therefore, the cushioning effect of the cushioning material 23 can absorb the impact energy and attenuate the impact force.

[First Embodiment]
Next, the impact reduction structure 4 according to the first embodiment of the present invention will be described.
The impact reduction structure 4 according to the first embodiment of the present invention applies an impact force generated when a flying object 11 such as an aircraft collides with the ground and propagated to a protected equipment 10 buried in the ground. Can be reduced.

As shown in FIG. 19, the impact reduction structure 4 includes a lightweight soil 24 provided above the equipment to be protected 10 and a soil 25 provided on the upper surface of the lightweight soil 24 and having a higher density than the lightweight soil 24.

The lightweight soil 24 is a substance having a lower density than ordinary soil, and is, for example, EPS crushed fragment mixed soil (EPS: Expanded Poly Styrol). The EPS crushed piece is obtained by crushing the discarded Styrofoam by a crusher, and the EPS crushed piece mixed with ordinary soil is the EPS crushed piece mixed soil. The lightweight soil 24 is more easily crushed than ordinary soil and has a high cushioning effect. As a result, the lightweight soil 24 reduces the impact energy generated when the flying object 11 collides.

The lightweight soil 24 is arranged so as to surround the protected equipment 10 located underground. That is, the lightweight soil 24 is arranged from the bottom of the protected equipment 10 to a position higher than the top. The soil located deeper than the bottom of the protected equipment 10 has a higher density than the lightweight soil 24. The upper surface of the lightweight soil 24 is, for example, a horizontal surface. The lightweight soil 24 may or may not be arranged on the side of the equipment to be protected 10.

The soil 25 is, for example, a soil obtained by compacting ordinary soil to increase its density, or a mixed rock soil. The soil 25 is arranged in layers on the upper surface of the lightweight soil 24. The soil 25 is arranged up to the ground surface.

When the lightweight soil 24 is used alone, when the flying object 11 collides with it, a large local deformation occurs, and the impact force is propagated to the equipment to be protected 10 while being hardly reduced by the lightweight soil 24. .. On the other hand, since the soil 25 is arranged in layers on the upper surface of the lightweight soil 24, the force is dispersed when the flying object 11 collides with the soil 25. In addition, the soil 25, which has a higher density than the lightweight soil 24, prevents the flying object 11 from sinking into the ground, and can prevent the impact reduction structure 4 from being locally deformed.

The lightweight soil 24 and the soil 25 may be arranged one layer each, or two or more layers may be arranged alternately as shown in FIG. When composed of a plurality of layers, there is a layer in which the lightweight soil 24 is arranged on the upper surface of the soil 25, and the stress wave generated by the impact is reflected at the interface between the soil 25 and the lightweight soil 24, and the stress wave is transmitted through the soil 25. Can be reduced. Therefore, the impact force propagated toward the protected equipment 10 can be reduced. When the number of layers is two or more, the boundary surface is increased, so that the effect of reducing the impact force can be increased.

In the above-described embodiment, the case where the lightweight soil 24 and the soil 25 are laminated has been described, but the present invention is not limited to this example. That is, it suffices if the local large deformation of the lightweight soil 24 can be suppressed, and as shown in FIG. 20, a metal plate 26, for example, a steel plate or the like may be arranged instead of the soil 25. The thickness of the metal plate 26 is set so as not to penetrate due to the impact force generated when the flying object 11 collides.

As shown in FIG. 20, the metal plate 26 and the lightweight soil 24 may be arranged in a plurality of layers. In this case, the total thickness of all the metal plates is set so as not to penetrate due to the impact force generated when the flying object 11 collides.

When the metal plate 26 is used, the rigidity can be set higher than that of the soil 25, and in that case, the depth of penetration of the flying object 11 can be made shallow. As a result, the distance from the flying object 11 to the equipment to be protected 10 becomes long, so that the damping effect can be increased.

According to the above-described embodiment and modification, the equipment to be protected 10 is buried by the impact reduction structure 4 in which the lightweight soil 24 and the soil 25 or the metal plate 26 are laminated, so that it occurs at the time of the collision of the flying object 11. The impact force propagated to the equipment to be protected 10 is reduced. As a result, the soundness of the equipment to be protected 10 is maintained.

In addition, in the 1st reference embodiment to the 3rd reference embodiment and the 1st embodiment, the impact reduction devices 1, 2 and 3 and the impact reduction structure 4 provided incidentally to the equipment to be protected 10 have been described. The invention is not limited to this example. That is, the impact reduction device and the impact reduction structure according to the present invention can be applied to all buildings buried underground, and are particularly suitable for applications to buildings that need to ensure a high degree of safety. .. The impact reduction device and the impact reduction structure according to the present invention may be provided in a building other than the protected equipment 10 among the buildings installed in the power plant, or may be provided in a building installed in a building other than the power plant. May be done.

1: Impact reduction device 2: Impact reduction device 3: Impact reduction device 4: Impact reduction structure 5: Pool 6: Structure 7: Wall 8: Bottom 9: Filling 10: Protected equipment 11: Flying object 12: Cushioning material 13: Scale line 14: Vulnerable part 15: Base plate 16: Mount 17: Plate material 18: Cushioning material 19: Pipe material 20: Roof 21: Panel material 22: Panel material 23: Cushioning material 24: Lightweight soil 25: Soil 26: Metal Plate 30: Reactor building 31: Power plant

Claims (4)

It is an impact reduction structure having a structure that reduces the impact force generated by the collision of an object and propagated to a building buried in the ground.
Lightweight soil that is installed above the building and has a lower density than ordinary soil,
Provided on the upper surface of the lightweight soil, a metal plate is set to a thickness that does not penetrate the rigidity rather higher than lighter soils, and by the impact force,
Impact reduction structure with. It is an impact reduction structure having a structure that reduces the impact force generated by the collision of an object and propagated to a building buried in the ground.
Lightweight soil that is installed above the building and has a lower density than ordinary soil,
A plurality of metal plates provided on the upper surface of the lightweight soil and having a higher rigidity than the lightweight soil are provided.
The lightweight soil is laminated between the plurality of metal plates, respectively.
An impact reduction structure in which the total thickness of all of the plurality of metal plates is set to a thickness that does not penetrate due to the impact force. The impact reduction structure according to claim 1 or 2, wherein the lightweight soil is a mixed soil in which the ordinary soil and styrofoam are mixed. A power plant having the impact reduction structure according to any one of claims 1 to 3.

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