Building structure and reactor building

Abstract

To provide a structure advantageous for ensuring the stability of a building even when an earthquake occurs, in which a weight of an upper part of the building is not heavy even when a reinforced concrete structure or a steel plate concrete structure is adopted in order to prevent the back surfaces of walls and floors of the building from peeling off.SOLUTION: A building structure of the present invention is characterized in that reinforced concrete or steel plate concrete constituting the building is coated with a material that suppresses the scattering of concrete fragments that occur on a back surface of the reinforced concrete or steel plate concrete opposite the surface that is hit by an external flying object when the external flying object hits the building.SELECTED DRAWING: Figure 2(b)

Description

[Technical field]

[0001] The present invention relates to a building structure and a reactor building, and more particularly to a building structure and a reactor building suitable for, for example, a reactor building installed in a nuclear power plant, in which measures have been taken to prevent backside peeling (a phenomenon in which the inside of the outer wall or slab of a reinforced concrete structure or a steel plate concrete structure becomes isolated due to the impact of an external collision) on the outer walls or slabs of the reinforced concrete structure or the steel plate concrete structure. [Background technology]

[0002] Among the structures that make up a nuclear power plant, the reactor building, which is equipped with safety functions, needs to have its safety functions capable of shutting down the reactor protected against the threat of collision with external flying objects such as aircraft.

[0003] In response to this, measures have been taken to protect the exterior walls and slabs of the reactor building by making them of reinforced concrete structure and making them thick enough that the function of the safety systems and equipment installed inside the reactor building will not be affected even if an external flying object hits them.

[0004] In addition to the reinforced concrete structure, measures have been taken to prevent peeling off of the underside by installing steel plate concrete on the inside of the reactor building.

[0005] Patent Document 1 can be mentioned as an example of a prior art document in which measures are taken to prevent the above-mentioned back surface peeling.

[0006] This patent document 1 discloses a nuclear facility equipped with an exterior wall having a short fiber reinforced concrete wall in which fibers are mixed into cement in order to reduce the wall thickness while preventing back surface peeling due to impact loads, and an inner steel plate fixed with anchors to at least the inner surface of the short fiber reinforced concrete wall. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-80359 A Summary of the Invention [Problem to be solved by the invention]

[0008] In order to avoid affecting equipment with safety functions inside the nuclear building, measures are taken to either use a reinforced concrete structure of a thickness that will not cause backside peeling, or to install steel plate concrete to prevent backside peeling.

[0009] However, if reinforced concrete of a thickness that will not cause peeling off the backside is used in order to prevent this, or if steel plate concrete is used, the weight of the upper part of the reactor building will increase, making the structure extremely disadvantageous from the perspective of ensuring the stability of the building in the event of an earthquake, for example.

[0010] Moreover, the above-mentioned Patent Document 1 does not disclose any measures to solve the above-mentioned problems.

[0011] The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to provide a building structure and a reactor building which, even if a reinforced concrete structure or a steel plate concrete structure is adopted to prevent peeling off of the undersides of the building walls and floors, does not increase the weight of the upper part of the building and can be structured in a way that is advantageous for ensuring the stability of the building even in the event of an earthquake. [Means for solving the problem]

[0012] In order to achieve the above-mentioned objective, the building structure of the present invention is characterized in that the reinforced concrete or steel plate concrete constituting the building is coated with a material that suppresses the scattering of concrete fragments that occur on the back surface of the reinforced concrete or steel plate concrete opposite the surface that is hit by the external flying object when the external flying object hits the building.

[0013] Furthermore, in order to achieve the above-mentioned object, the reactor building of the present invention is a reactor building that is arranged to surround a reactor containment vessel in which a reactor pressure vessel in which a reactor is housed is housed, and is characterized in that the reactor building is composed of at least an exterior wall and a slab, the exterior wall and the slab are made of reinforced concrete or steel plate concrete, and the reinforced concrete or the steel plate concrete is coated with a material that suppresses the scattering of concrete fragments that occur on the back surface of the reinforced concrete or the steel plate concrete opposite the surface that is hit by the external flying object when the external flying object hits the reinforced concrete or the steel plate concrete. Effect of the Invention

[0014] According to the present invention, even if a reinforced concrete structure or a steel plate concrete structure is adopted to prevent the undersides of the building's walls and floors from peeling off, the weight of the upper part of the building is not increased, and the structure is advantageous in ensuring the stability of the building even in the event of an earthquake. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing a nuclear facility equipped with a reactor building, which is an example of a building structure of the present invention. [Figure 2(a)] FIG. 2 is an enlarged cross-sectional view showing reinforced concrete used for the outer walls and slabs of a reactor building, which is an example of the building structure of the present invention. [Figure 2(b)] FIG. 3 is a diagram showing a state in which an external flying object collides with the reinforced concrete shown in FIG. 2(a). [Figure 3(a)] FIG. 2 is an enlarged cross-sectional view showing a steel plate concrete structure used for the outer walls and slabs of a reactor building, which is an example of the building structure of the present invention. [Figure 3(b)] FIG. 4 is a diagram showing a state in which an external flying object collides with the steel plate concrete shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The building structure and reactor building of the present invention will be described below based on the illustrated embodiment. In each drawing, the same reference numerals are used for the same components. EXAMPLES

[0017] Figure 1 shows a nuclear facility 1 equipped with a reactor building 4, which is an example of a building structure of the present invention. Figure 2(a) shows reinforced concrete 16 used for the outer walls 4a and slab 4b of the reactor building 4, which is an example of a building structure of the present invention. Figure 2(b) shows the state where an external flying object 9 has collided with the reinforced concrete 16 shown in Figure 2(a). Figure 3(a) shows steel plate concrete 17 used for the outer walls 4a and slab 4b of the reactor building 4, which is an example of a building structure of the present invention. Figure 3(b) shows the state where an external flying object 9 has collided with the steel plate concrete 17 shown in Figure 3(a).

[0018] As shown in FIG. 1, a nuclear facility 1 is roughly composed of a reactor pressure vessel 2 in which a nuclear reactor (not shown) is housed, a reactor containment vessel 3 in which the reactor pressure vessel 2 is housed, and a reactor building 4 arranged to surround the periphery of the reactor containment vessel 3.

[0019] The reactor building 4 is composed of an exterior wall 4a and a slab (including the roof) 4b, and the exterior wall 4a and the slab 4b are composed of reinforced concrete 16 made of reinforcing bars 5 and concrete 6 which do not penetrate but peel off from the back side when exposed to an external flying object 9 as shown in FIG. 2(a), or steel plate concrete 17 made of steel plates 11 and concrete 12 which do not penetrate but peel off from the back side when exposed to an external flying object 9 as shown in FIG. 3(a).

[0020] The nuclear facility 1 described above is equipped with equipment that has safety functions and needs to be protected, such as pumps, generators, and fuel, and must be equipped with a protection function to prevent the equipment from being taken out of service due to concrete fragments 10 (see Figure 2(b)), concrete fragments 15 (see Figure 3(b)), and other fragments of the colliding object being scattered when an external flying object 9 collides with the outer wall 4a or slab 4b.

[0021] Therefore, in this embodiment, the reinforced concrete 16 or the steel plate concrete 17 is coated with a material, for example, a resin lining 8 or a resin lining 14, that can prevent concrete pieces 10 or 15 from scattering on the back surface of the reinforced concrete 16 or the steel plate concrete 17 opposite the surface 7 or 13 that is hit by the external flying object 9 when the reinforced concrete 16 or the steel plate concrete 17 is hit by the external flying object 9, without breaking even when plastically deformed (the state shown in Figures 2(b) and 3(b)).

[0022] By adopting the configuration of this embodiment, the resin lining 8 or 14, which is an application material, is applied to the surface of the outer wall 4a and slab (including roof) 4b of the reactor building 4, in which equipment with safety functions is installed, opposite the surface 7 or 13 with which the external flying object 9 collides, so that when the external flying object 9 collides with the outer wall 4a and slab (including roof) 4b of the reactor building 4, the impact can be withstood and peeling can be prevented on the inner surface, which is the surface opposite the surface 7 or 13 with which the external flying object 9 collides with the outer wall 4a and slab (including roof) 4b of the reactor building 4.

[0023] As a result, the outer walls 4a and slabs 4b of the reinforced concrete structure of this embodiment can have a reduced overall thickness compared to the outer walls and slabs of general reinforced concrete structures. Therefore, in a newly constructed nuclear power plant, a reinforced concrete structure can be made thick enough that it does not penetrate but peels off from the back surface, which contributes to a reduction in the amount of material. Also, in an existing nuclear power plant, it is only necessary to apply a material that can be held in place without breaking even if it undergoes plastic deformation to the existing wall surface, which has the effect of contributing to a shortened construction period.

[0024] Therefore, according to this embodiment, even if a reinforced concrete structure or a steel plate concrete structure is adopted to prevent peeling off of the underside of the outer wall 4a and the slab (including the roof) 4b of the reactor building 4, the weight of the upper part of the reactor building 4 is not heavy, and the structure is advantageous in ensuring the stability of the reactor building 4 even in the event of an earthquake.

[0025] The present invention is not limited to the above-described embodiments, and includes various modified examples. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the configurations described. In addition, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0026] 1...reactor facility, 2...reactor pressure vessel, 3...reactor containment vessel, 4...reactor building, 4a...exterior wall of reactor building, 4b...reactor building slab (including roof), 5...reinforced bars, 6, 12...concrete, 7, 13...surface affected by external flying objects, 8, 14...plastic lining, 9...external flying objects, 10, 15...concrete pieces, 11...steel plate, 16...reinforced concrete, 17...steel plate concrete.

Claims

1. A building structure characterized in that the reinforced concrete or steel plate concrete that constitutes the building is coated with a material that suppresses the scattering of concrete fragments that occur on the back surface of the reinforced concrete or steel plate concrete opposite the surface that is hit by an external flying object when the building is hit by an external flying object.

2. The building structure according to claim 1, A building structure characterized in that the material is a resin lining.

3. A reactor building is arranged to surround a reactor containment vessel in which a reactor pressure vessel containing a nuclear reactor is stored, The reactor building is composed of an outer wall and a slab, and the outer wall and the slab are made of reinforced concrete or steel plate concrete, A reactor building characterized in that the reinforced concrete or the steel plate concrete is coated with a material that suppresses the scattering of concrete fragments that occur on the back surface of the reinforced concrete or the steel plate concrete opposite the surface that is hit by the external flying object when the external flying object hits the reinforced concrete or the steel plate concrete.

4. The reactor building according to claim 3, A reactor building, wherein the material is a resin lining.

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