JP2016061012A - Submersion prevention structure of quake-free building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety performance by preventing a functional disorder from being caused by submersion of a base-isolating device, in a submersion prevention structure of a quake-free building.SOLUTION: A submersion prevention structure of a quake-free building includes: a lower foundation slab 31 that is provided on ground 22; an upper foundation slab 32 that is provided above the lower foundation slab 31 and in which a reactor container 11 is installed; a base-isolating device 33 that has a plurality of seismically isolated structures 36 arranged at predetermined intervals in a horizontal direction between the upper and lower foundation slabs 32 and 31; a drain ditch 42 that is provided on the periphery of the lower foundation slab 31; and a siphon pipe 51 for discharging water in the drain ditch 42 to the outside.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure for preventing submersion of a seismic isolation building such as a reactor containment vessel equipped with a seismic isolation device.

  One of the nuclear power plants is a pressurized water reactor. In this pressurized water reactor, light water is used as a reactor coolant and a neutron moderator, and high-temperature and high-pressure water that does not boil throughout the primary system is used. Water is sent to a steam generator to generate steam by heat exchange, and this steam is sent to a turbine generator to generate electricity.

  In a nuclear power plant having such a pressurized water reactor, the containment vessel is erected on a foundation plate laid on the ground, and the foundation plate has a seismic isolation structure. As a basic version having such a seismic isolation structure, for example, there is one described in Patent Document 1 below. In the building foundation structure described in Patent Document 1, a seismic isolation device is provided between a lower foundation plate provided on the ground and an upper foundation plate on which a reactor containment vessel is erected.

  In this nuclear power plant, when the basic version of the reactor containment vessel is inundated due to heavy rain, tsunami, river flooding, etc., there is a risk of hindering the operation of the seismic isolation device. Therefore, in order to waterproof the seismic isolation device, the building basic structure described in Patent Document 1 includes a waterproof cover that covers a plurality of seismic isolation structures.

JP 2013-249711 A

  In the basic structure of a conventional building, by providing a waterproof cover that covers multiple seismic isolation structures, even if the surrounding area of the building is inundated due to heavy rain, tsunami, river flooding, etc., this waterproof cover provides seismic isolation. Prevents the device from flooding. However, if the area around the building is submerged, foreign matter such as mud and dead leaves may flow along with the water, and the waterproof cover may be damaged. In addition, the foreign matter is clogged in the drainage groove and sufficient drainage capacity cannot be exhibited, and the seismic isolation device may be submerged. Moreover, when a large earthquake occurs and the external power supply of the plant is lost, the pump that is normally used cannot be started, and the drainage facility may not be operated.

  This invention solves the subject mentioned above, and it aims at providing the submergence prevention structure of the seismic isolation building which prevents the functional failure by the submergence of a seismic isolation apparatus, and improves safety performance.

  In order to achieve the above object, the submergence prevention structure of the seismic isolation building of the present invention includes a lower foundation plate provided on the ground, and an upper foundation plate provided above the lower foundation plate and provided with a structure. A seismic isolation device having a seismic isolation structure arranged in a horizontal direction at a predetermined interval between the upper base plate and the lower base plate, a drainage groove provided around the lower base plate, and the drainage And a siphon tube that discharges the water in the groove to the outside.

  Therefore, if the surrounding area of the building is inundated due to heavy rain, tsunami, river flooding, etc., and a certain amount of water accumulates in the drainage groove around the lower base plate, the siphon pipe will be filled with water, Is discharged to the outside through the siphon tube due to the siphon effect. As a result, the water in the building can be discharged to the outside without using power, and the functional failure due to the submergence of the seismic isolation device can be prevented to improve the safety performance.

  In the submergence prevention structure for a seismic isolation building according to the present invention, the siphon tube is disposed below the seismic isolation structure.

  Therefore, the siphon tube is arranged below the seismic isolation structure, so that the water accumulated in the drainage groove fills the siphon tube before reaching the seismic isolation structure, and the siphon effect causes the water to flow in the siphon tube. It is possible to start and drain the water in the drainage channel to the outside, and to prevent functional failure caused by submersion of the seismic isolation device.

  In the submergence prevention structure of the seismic isolation building according to the present invention, a retaining wall surrounding the lower foundation plate and the upper foundation plate is provided, the siphon pipe passes through the retaining wall, and the water intake port at one end is the It is located above the drainage groove, and the drainage port at the other end is connected to the drainage tank.

  Therefore, the siphon tube that penetrates the retaining wall takes water accumulated in the drainage channel from the intake port, drains this water from the drainage port to the drainage tank, and properly discharges the water in the drainage channel to the outside. Can do.

  In the submergence prevention structure of the seismic isolation building of the present invention, the drainage tank is a drainage pit located below the drainage groove outside the retaining wall, and a drainage port of the siphon pipe is connected to the drainage pit, A water discharge pipe is connected to the drain pit.

  Therefore, by providing a drainage pit outside the retaining wall below the drainage groove, the water collected in the drainage groove is taken by the siphon pipe and appropriately drained into the drainage pit, and the water in this drainage pit is discharged from the drainage pipe. As a result, the water in the drainage can be properly discharged to the outside.

  In the structure for preventing submergence of a seismic isolation building according to the present invention, the siphon pipe and the drain pit are arranged at a predetermined interval in the circumferential direction of the retaining wall, and the plurality of drain pits are connected by a connecting pipe. It is said.

  Therefore, the drainage pits are connected by the connecting pipes, so that water drained from the drainage grooves by the siphon pipes to the drainage pits is discharged from the drainage pipes through the other drainage pits. It can be discharged to the outside.

  In the submergence prevention structure of the seismic isolation building of the present invention, the drainage tank is a drainage pipe located outside the drainage wall and below the drainage groove, and the siphon pipe is spaced at a predetermined interval in the circumferential direction of the retaining wall. The plurality of siphon pipes are connected to the drain pipe, and the drain pipe is connected to the drain pipe.

  Therefore, by providing a drain pipe below the drainage groove outside the retaining wall, the water collected in the drainage groove is taken up by each siphon pipe and drained into the drainage pipe properly. The water will be discharged, and the water in the drainage can be properly discharged to the outside.

  In the submergence prevention structure of the seismic isolation building according to the present invention, the siphon pipe is provided with a check valve for preventing a backflow of water to the drainage groove side.

  Therefore, the check valve prevents external water from flowing back to the drainage groove side through the siphon tube, and the seismic isolation device can be prevented from being submerged.

  In the submergence prevention structure for a seismic isolation building according to the present invention, the siphon pipe is provided with a pump for discharging water in the drainage groove to the outside.

  Therefore, by providing a pump in the siphon tube, the siphon tube can be filled with water by operating the pump regardless of the amount of water in the drainage groove. The water in the drainage channel can be drained to the outside, and the submergence of the seismic isolation device can be prevented at an early stage.

  In the submergence prevention structure of the seismic isolation building according to the present invention, the drainage tank is characterized in that a deepest part is provided on a bottom surface, and a drainage port of the siphon tube is arranged in the deepest part.

  Therefore, the siphon tube drainage port is disposed at the deepest part of the drainage groove, so that when the pump is operated, the siphon tube can be quickly filled with water.

  According to the submergence prevention structure of the seismic isolation building of the present invention, the drainage groove is provided around the lower base plate and the siphon pipe for discharging the water of the drainage groove to the outside is provided. The safety performance can be improved by preventing functional failure caused by submergence of the seismic isolation device.

FIG. 1 is a schematic configuration diagram illustrating a submergence prevention structure of the seismic isolation building according to the first embodiment. FIG. 2 is a schematic plan view showing a submergence prevention structure of the seismic isolation building. FIG. 3 is a schematic sectional view showing the drainage facility. FIG. 4 is a plan view showing the drainage facility. FIG. 5: is a schematic sectional drawing showing the drainage facility of the building of 2nd Embodiment. FIG. 6 is a schematic cross-sectional view showing the drainage facility of the building of the third embodiment.

  Exemplary embodiments of a submergence prevention structure for a seismic isolation building according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

[First Embodiment]
The nuclear reactor according to the first embodiment uses light water as a reactor coolant and a neutron moderator, and generates high-temperature and high-pressure water that does not boil over the entire core, and generates steam by heat exchange by sending this high-temperature and high-pressure water to a steam generator. And a pressurized water reactor (PWR) that generates power by sending the steam to a turbine generator.

  FIG. 1 is a schematic configuration diagram illustrating a submergence prevention structure of the seismic isolation building according to the first embodiment, and FIG. 2 is a schematic plan view illustrating a submergence prevention structure of the base isolation building.

  In the first embodiment, as shown in FIGS. 1 and 2, the reactor containment vessel 11 contains a pressurized water reactor 12, a steam generator 13, a pressurizer 14, and the like. The reactor containment vessel 11 is installed on a solid ground 22 such as a rock through a foundation plate 21. That is, the ground 23 is dug down to the ground 22 by a predetermined depth to form a recess 24, the base plate 21 is installed in the recess 24, and the reactor containment vessel 11 is erected on the base plate 21.

  The basic version 21 is composed of a lower basic version 31, an upper basic version 32, and a seismic isolation device 33. The lower basic plate 31 and the upper basic plate 32 have a rectangular shape in plan view, and the reactor containment vessel 11 has a circular shape in plan view. The lower base plate 31 has, for example, a reinforced concrete structure (RC structure) in which a reinforcing bar is incorporated, and is laid on the ground 22 that is flatly formed in the recess 24, and has a height substantially the same as that of the ground 23 around the periphery. The retaining wall 34 is formed, and is constructed in a rectangular shape or a rectangular shape so that its surface (upper surface) is flat.

  The upper base plate 32 has, for example, a reinforced concrete structure (RC structure) in which a reinforcing bar is incorporated therein, and the surface (upper surface) of the upper base plate 32 is substantially the same as that of the ground 23. It is constructed in a rectangular parallelepiped shape or a rectangular parallelepiped shape so that its height and the front surface and back surface (lower surface) are flat. The upper base plate 32 is provided with a plurality of space portions 35 for accommodating various devices. The upper basic version 32 is provided with the reactor containment vessel 11 as a structure on the upper surface.

  The seismic isolation device 33 is provided between the upper surface of the lower base plate 31 and the lower surface of the upper base plate 32. The seismic isolation device 33 is configured by arranging a plurality of seismic isolation structures 36 in a grid pattern at predetermined intervals (preferably at equal intervals) in the horizontal direction. The seismic isolation structure 36 has, for example, a multilayer seismic isolation structure in which disc-shaped rubber materials and disc-shaped steel plates are alternately laminated. That is, as shown in FIG. 3, the base isolation structure 36 is provided with a lower pedestal 36b at the lower part of the multilayer base isolation structure 36a and an upper pedestal 36c at the upper part. In the multi-layer seismic isolation structure 36 a, the lower pedestal 36 b is arranged (fixed) on the upper surface of the lower foundation plate 31, and the upper pedestal 36 c is connected (fixed) to the lower surface of the upper foundation plate 32.

  The seismic isolation structure 36 is not limited to a multilayer seismic isolation structure, and may be, for example, a hydraulic damper.

  The reactor containment vessel 11 is a reinforced concrete reactor containment vessel (PCCV: Prestressed Concrete Containment Vessel) or steel plate concrete containment vessel (SCCV: Steel Concrete Containment). Vessel), or a nuclear reactor containment vessel such as a reinforced concrete containment vessel (RCCV) or a steel containment vessel (SCV). Therefore, the base plate 21 needs to properly support the reactor containment vessel 11 that is a heavy object and ensure high earthquake resistance by the seismic isolation device 33.

  In the first embodiment, a building drainage device 40 is provided. FIG. 3 is a schematic sectional view showing the drainage facility, and FIG. 4 is a plan view showing the drainage facility.

  In the drainage device 40, as shown in FIGS. 3 and 4, a slope 41 is provided on the upper surface around the lower base plate 31 so as to incline downward toward the outside. The slope 41 is provided outside the seismic isolation device 33. Further, the slope 41 is provided with a drain groove 42 on the outside thereof.

  That is, the lower foundation plate 31 is provided with a retaining wall 34 surrounding the upper foundation plate 32 around the periphery, and a predetermined distance is secured in the horizontal direction between the upper foundation plate 32 and the retaining wall 34, An open space S is secured. The lower base plate 31 is provided with a horizontal upper surface portion 31a facing the upper base plate 32, and a slope 41 is provided outside the upper surface portion 31a. In this case, since the lower base plate 31 has a rectangular parallelepiped shape or a rectangular parallelepiped shape, a slope 41 that is inclined downward from the four sides of the outer periphery toward the outside is provided.

  The drainage groove 42 is provided inside the retaining wall 34 in the lower base plate 31. The drainage groove 42 is provided continuously at the outer end portion of the slope 41 and has a bottom surface lower than the outer end portion of the slope 41. In this case, since the retaining wall 34 has a square ring shape in plan view, the drainage groove 42 has a ring shape having a square shape in plan view along the inside of the retaining wall 34. Therefore, the slope 41 can collect the water that has entered the space S through the drainage groove 42.

  The retaining wall 34 is provided with a drainage pit (drainage tank) 43 on the outside. A plurality of drain pits 43 are provided along the circumferential direction outside the retaining wall 34. On the other hand, in the lower foundation plate 31, the drainage groove 42 is provided with a drainage hole 44 on the bottom surface, and one end of the drainage pipe 45 is connected. A plurality (the same number) of drain holes 44 and drain pipes 45 are provided corresponding to the plurality of drain pits 43, and the other end of the drain pipe 45 is connected to the drain pit 43. Each drainage pit 43 is connected by a connecting pipe 46 and is provided below the drainage groove 42. One end of a water discharge pipe 47 is connected and the other end extends to a water discharge path 48. The drainage surface level is set lower than the bottom surface of the drainage pit 43.

  Further, the drainage device 40 has a siphon pipe 51 that discharges the water in the drainage groove 42 to the outside. The siphon tube 51 is disposed below the seismic isolation structure 36, that is, at a height H substantially the same as the upper surface of the lower pedestal 36b. That is, the siphon tube 51 has a U-shape (or a U-shape having a curved portion instead of the horizontal portion 51a) including a horizontal portion 51a, a first vertical portion 51b, and a second vertical portion 51c. . The siphon tube 51 has a horizontal portion 51a penetrating the retaining wall 34 inward and outward, and a water intake 53 is provided at one end of a first vertical portion 51b connected to the space S side via a strainer 52. . Further, the siphon tube 51 is provided with a drain port 54 at the other end portion of the second vertical portion 51c.

  Similar to the drain holes 44 and the drain pipes 45, a plurality of siphon pipes 51 are provided at predetermined intervals in the circumferential direction, and the same number of siphon pipes 51 are provided corresponding to the drain pits 43. Each siphon pipe 51 is connected such that the water intake 53 is positioned above the bottom surface in the drainage groove 42 and the drainage port 54 is disposed in the drainage pit 43.

  The seismic isolation device 33 is provided with a waterproof cover 61 that covers the plurality of seismic isolation structures 36 from the outside. The waterproof cover 61 is provided so as to be deformable between the upper base plate 32 and the lower base plate 31 and has flexibility. The cover 61 can prevent water from entering the seismic isolation structure 36 side. A closing member 62 that can be opened and closed is provided between the upper surface of the upper base plate 32 and the upper surface of the retaining wall 34. The closing member 62 is rotatably supported on the upper surface of the upper base plate 32 by a support shaft 63, and a sealing member 64 is interposed between the distal end portion and the retaining wall 34. In this case, since the space portion S formed by the upper base plate 32 and the retaining wall 34 has a ring shape having a square shape in plan view, the closing member 62 is divided into four parts, for example, wider than the width of the space portion S. A plate having a width can block the four sides of the space S upward. The closing member 62 can prevent water from entering the space S during rainfall by sealing between the upper base plate 32 and the retaining wall 34.

  Here, the operation of the drainage device 40 of the present embodiment will be described.

  As shown in FIGS. 1, 3, and 4, when the periphery of the reactor containment vessel 11 is flooded due to heavy rain, tsunami, river flooding, etc., the water is a space between the base plates 31, 32 and the retaining wall 34. Invade S. During normal rain, since the closing member 62 seals between the upper foundation plate 32 and the retaining wall 34, the closing member 62 can prevent water from entering the space S. However, when heavy rain, tsunami, river flooding, etc. occurs, water enters the space S from between the blocking member 62 and the retaining wall 34, or the blocking member 62 is damaged and water enters the space S. Or Then, the water that has entered the space S is accumulated in the drainage groove 42 via the slope 41. Then, the water accumulated in the drainage groove 42 is discharged from each drainage hole 44 through the drainage pipe 45 to the drainage pit 43, and is further discharged through the drainage pipe 47 into the drainage channel 48. In addition, since the plurality of seismic isolation structures 36 are covered with the waterproof cover 61, flooding of the seismic isolation structures 36 is prevented.

  However, if foreign matter such as mud or vegetation is mixed in the water that has entered the space S, the drain holes 44 and the drain pipe 45 are clogged, and it is difficult to discharge the water in the drain grooves 42 to the drain pits 43. It becomes. And if the drainage groove | channel 42 cannot discharge the accumulated water to the drainage pit 43, the water level of the space part S will rise. And if the water level of the drain ditch 42 and the space part S rises to the substantially same height H as the upper surface of the lower pedestal 36b, the siphon pipe | tube 51 in the same height H will be filled with water inside.

  Then, since the siphon pipe 51 has a lower drainage port 54 in the drainage pit 43 than the intake port 53 in the drainage groove 42, the water accumulated in the drainage groove 42 and the space S is siphoned. As a result, the water is drained into the drain pit 43 through the siphon pipe 51, and is further discharged into the water discharge channel 48 through the water discharge pipe 47. For this reason, water intrusion into the seismic isolation structure 36 is prevented.

  Thus, in the submergence prevention structure of the seismic isolation building according to the first embodiment, the lower foundation plate 31 provided on the ground 22 and the reactor containment vessel 11 provided above the lower foundation plate 31 are installed. An upper base plate 32, a seismic isolation device 33 having a base isolation structure 36 arranged in a horizontal direction at a predetermined interval between the upper base plate 32 and the lower base plate 31, and around the lower base plate 31 A drainage groove 42 is provided, and a siphon pipe 51 that discharges the water in the drainage groove 42 to the outside.

  Accordingly, when the periphery of the reactor containment vessel 11 is inundated due to heavy rain, tsunami, river flooding, etc., and when a predetermined amount of water accumulates in the drainage groove 42 provided around the lower base plate 31, water enters the siphon pipe 51. The water in the drain groove 42 is discharged through the siphon pipe 51 due to the siphon effect. As a result, the water in the building can be discharged to the outside by the siphon pipe 51 without using power, and the functional failure due to the submergence of the seismic isolation device 33 can be prevented and the safety performance can be improved.

  In the submergence prevention structure of the seismic isolation building of the first embodiment, the siphon pipe 51 is disposed below the seismic isolation structure 36. Therefore, since the water accumulated in the drainage groove 42 is filled in the siphon pipe 51 before reaching the seismic isolation structure 36, the water starts flowing in the siphon pipe 51 due to the siphon effect, and the water in the drainage groove 42 is discharged to the outside. It is possible to prevent the seismic isolation device 33 from being damaged due to submersion.

  In the submergence prevention structure of the seismic isolation building according to the first embodiment, the retaining wall 34 surrounding the lower foundation plate 31 and the upper foundation plate 32 is provided, the siphon pipe 51 penetrates the retaining wall 34, and the water intake at one end portion 53 is located above the drainage groove 42, and the drainage port 54 at the other end is connected to the drainage pit 43. Accordingly, the siphon pipe 51 penetrating the retaining wall 34 takes the water accumulated in the drainage groove 42 from the intake port 53 and drains this water from the drainage port 54 to the drainage pit 43. It can be properly discharged outside.

  In the submergence prevention structure of the seismic isolation building according to the first embodiment, a drainage pit is provided outside the retaining wall 34 and below the drainage groove 42, and the drainage port 54 of the siphon pipe 51 is connected to the drainage pit 43. 43 is connected to a water discharge pipe 47. Therefore, by providing the drainage pit 43 outside the retaining wall 34 and below the drainage groove 42, the water accumulated in the drainage groove 42 is taken from the intake port 53 of the siphon pipe 51 due to the siphon effect, and appropriately from the drainage port 54. The water is discharged into the drain pit 43, and the water in the drain pit 43 is discharged from the water discharge pipe 47, so that the water in the drain groove 42 can be appropriately discharged to the outside.

  In the submergence prevention structure of the seismic isolation building of the first embodiment, a plurality of siphon pipes 51 and drain pits 43 are arranged at predetermined intervals in the circumferential direction of the retaining wall 34, and the plurality of drain pits 43 are connected by a connecting pipe 46. A water discharge pipe 47 is connected to one or a plurality of drain pits 43. Therefore, the water drained from the drainage groove 42 to the drainage pit 43 by each siphon pipe 51 is discharged from the drainage pipe 47 through the other drainage pits 43, and the water in the drainage groove 42 can be appropriately discharged to the outside. it can.

[Second Embodiment]
FIG. 5: is a schematic sectional drawing showing the drainage facility of the building of 2nd Embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In 2nd Embodiment, as shown in FIG. 5, the drainage apparatus 70 of a building is provided. In the drainage device 70, a slope 41 and a drainage groove 42 are provided on the upper surface around the lower base plate 31. The retaining wall 34 is provided with a drain pipe (drainage tank) 71 on the outside. The drain pipe 71 is laid along the circumferential direction outside the retaining wall 34. In this case, the drain pipe 71 may have a ring shape that is endless, or may have a substantially ring shape having an end. The other end of each of the plurality of drain pipes 45 is connected to the drain pipe 71. And the drain pipe 71 is provided so that it may be located below the drain groove 42, and the water discharge pipe 47 is connected.

  Moreover, the drainage device 70 has a siphon pipe 51 that discharges the water in the drainage groove 42 to the outside. The siphon tube 51 is disposed below the seismic isolation structure 36. That is, the siphon tube 51 has a U-shape including a horizontal portion 51a, a first vertical portion 51b, and a second vertical portion 51c. The siphon tube 51 has a horizontal portion 51a penetrating the retaining wall 34 inward and outward, and a water intake 53 is provided at one end of a first vertical portion 51b connected to the space S side via a strainer 52. . Further, the siphon tube 51 is provided with a drain port 54 at the other end portion of the second vertical portion 51c.

  A plurality of siphon pipes 51 are provided at a predetermined interval in the circumferential direction, the water intake 53 is positioned above the bottom surface in the drain groove 42, and the water outlet 54 is connected so as to be disposed in the drain pipe 71. Yes. The siphon pipe 51 is provided with a check valve 72 that prevents the backflow of water to the drainage groove 42 side.

  Therefore, when the periphery of the reactor containment vessel 11 is flooded due to heavy rain, tsunami, river flooding, etc., the water enters the space S between the base plates 31 and 32 and the retaining wall 34. At this time, if foreign matter such as mud or vegetation is mixed in the water that has entered the space S, the drain holes 44 and the drain pipe 45 may be clogged, and the water in the drain grooves 42 may be discharged to the drain pipe 71. It becomes difficult.

  At this time, if the drainage groove 42 cannot discharge the accumulated water to the drainage pipe 71, the water level of the space portion S rises. And if the water level of the drainage groove 42 and the space part S rises to the siphon pipe 51, the inside of the siphon pipe 51 is filled with water. Then, since the siphon pipe 51 has a lower height of the drainage port 54 in the drainage pipe 71 than the intake port 53 in the drainage groove 42, the water accumulated in the drainage groove 42 and the space S is siphoned. Due to the effect, the water is drained to the drain pipe 71 through the siphon pipe 51 and further discharged through the water discharge pipe 47. For this reason, water intrusion into the seismic isolation structure 36 is prevented. Further, the check valve 72 prevents water in the drain pipe 71 from flowing back into the drain groove 42 through the siphon pipe 51.

  As described above, the submergence prevention structure of the seismic isolation building according to the second embodiment includes the seismic isolation structures 36 that are arranged in the horizontal direction at a predetermined interval between the upper base plate 32 and the lower base plate 31. The seismic isolation device 33, the drainage groove 42 provided around the lower foundation plate 31, the siphon pipe 51 that discharges the water in the drainage groove 42 to the outside, and the siphon pipe 51 provided outside the retaining wall 34 are connected. A drain pipe 71 is provided.

  Accordingly, when the periphery of the reactor containment vessel 11 is inundated due to heavy rain, tsunami, river flooding, etc., and when a predetermined amount of water accumulates in the drainage groove 42 provided around the lower base plate 31, water enters the siphon pipe 51. The water in the drainage groove 42 is discharged through the siphon pipe 51 to the drain pipe 71 by the siphon effect. As a result, the water in the building can be discharged to the outside by the siphon pipe 51 without using power, and the functional failure due to the submergence of the seismic isolation device 33 can be prevented and the safety performance can be improved.

  Further, by providing a drain pipe 71 outside the retaining wall 34 below the drain groove 42, the water accumulated in the drain groove 42 is taken up by each siphon pipe 51 and appropriately drained to the drain pipe 71. 71 water is discharged from the water discharge pipe 47, and the water in the drainage groove 42 can be appropriately discharged to the outside. Moreover, by using the drain pipe 71, construction becomes easy, the construction period can be shortened, and construction cost can be reduced.

  In the submergence prevention structure of the seismic isolation building according to the second embodiment, the check valve 72 for preventing the backflow of water to the drainage groove 42 side is provided in the siphon pipe 51. Therefore, the check valve 72 prevents external water from flowing back to the drain groove 42 side through the siphon pipe 51, and the seismic isolation device 33 can be prevented from being submerged.

[Third Embodiment]
FIG. 6 is a schematic cross-sectional view showing the drainage facility of the building of the third embodiment. In addition, the same code | symbol is attached | subjected to the member which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted.

  In 3rd Embodiment, as shown in FIG. 6, the drainage apparatus 80 of a building is provided. In the drainage device 80, a slope 41 and a drainage groove 42 are provided on the upper surface around the lower base plate 31. The retaining wall 34 is provided with a drain pit 43 on the outside. The drainage pit 43 is provided with a deepest portion 81 lower than the bottom surface 43a with respect to the bottom surface 43a.

  Further, the drainage device 80 has a siphon pipe 51 that discharges the water in the drainage groove 42 to the outside. The siphon tube 51 is disposed above the seismic isolation structure 36. That is, the siphon tube 51 has a U-shape including a horizontal portion 51a, a first vertical portion 51b, and a second vertical portion 51c. The siphon tube 51 has a horizontal portion 51a passing through the retaining wall 34 inward and outward above the seismic isolation structure 36, and is connected to one end portion of the first vertical portion 51b connected to the space S side via a strainer 52. A water intake 53 is provided. Further, the siphon tube 51 is provided with a drain port 54 at the other end portion of the second vertical portion 51c.

  A plurality of siphon pipes 51 are provided at predetermined intervals in the circumferential direction, the intake port 53 is located above the bottom surface in the drainage groove 42, and the drainage port 54 is deepest in the drainage pit 43 and below the bottom surface 43a. It is connected so as to be arranged in the part 81. And the siphon pipe | tube 51 is provided with the drainage pump 82 which discharges | emits the water of the drainage groove 42 outside. The drainage pump 82 is connected to an external AC power source and can be connected to an emergency power source used when the external AC power source is lost.

  Therefore, when the periphery of the reactor containment vessel 11 is flooded due to heavy rain, tsunami, river flooding, etc., the water enters the space S between the base plates 31 and 32 and the retaining wall 34. At this time, if foreign matter such as mud or vegetation is mixed in the water that has entered the space S, the drain holes 44 and the drain pipe 45 may be clogged, and the water in the drain grooves 42 may be discharged to the drain pit 43. It becomes difficult.

  At this time, if the drainage groove 42 cannot discharge the accumulated water to the drainage pit 43, the water level of the space S rises. At this time, the drain pump 82 is operated. Then, the siphon pipe 51 takes water from the drainage groove 42 through the water intake 53 and fills the inside with water. At this time, since the drainage part 54 is disposed in the deepest part 81 of the drainage pit 43, the siphon pipe 51 is placed inside the siphon pipe 51 if the deepest part 81 having a small volume is filled with water. Water fills up early. Here, even if the operation of the drain pump 82 is stopped, the siphon pipe 51 has a lower drainage port 54 in the drainage pipe 71 than the intake port 53 in the drainage groove 42. The water accumulated in the space S is drained to the drain pipe 71 through the siphon pipe 51 by the siphon effect, and is further drained through the drain pipe 47. For this reason, water intrusion into the seismic isolation structure 36 is prevented.

  As described above, the submergence prevention structure of the seismic isolation building according to the third embodiment has the seismic isolation structures 36 that are arranged in the horizontal direction at a predetermined interval between the upper base plate 32 and the lower base plate 31. A seismic isolation device 33, a drainage groove 42 provided around the lower base plate 31, a siphon pipe 51 for discharging the water in the drainage groove 42 to the outside, and a drainage for discharging the water in the drainage groove 42 to the outside by the siphon pipe 51 A pump 82 is provided.

  Therefore, when the drainage pump 82 is actuated when the periphery of the reactor containment vessel 11 is flooded due to heavy rain, tsunami, river flooding, etc., and a predetermined amount of water is accumulated in the drainage groove 42 provided around the lower base plate 31. Then, the siphon pipe 51 is filled with water, and even if the drain pump 82 is stopped thereafter, the water in the drain groove 42 is discharged to the drain pit 43 through the siphon pipe 51 by the siphon effect. As a result, the water in the building can be discharged to the outside by the siphon pipe 51 without using power, and the functional failure due to the submergence of the seismic isolation device 33 can be prevented and the safety performance can be improved.

  Further, by providing the drainage pump 82 in the siphon pipe 51, the drainage pump 82 can be operated when necessary regardless of the height of the siphon pipe 51 attached and the amount of water in the drainage groove 42. When the drainage is necessary, the drainage pump 82 can be operated to fill the siphon pipe 51 with water. After that, even if the drainage pump 82 is stopped, the drainage groove continues by the siphon pipe 51 due to the siphon effect. 42 water can be drained to the outside, and submergence of the seismic isolation device 33 can be prevented at an early stage.

  In the submergence prevention structure of the seismic isolation building according to the third embodiment, the deepest portion 81 is provided on the bottom surface 43 a of the drainage pit 43, and the drainage port 54 of the siphon pipe 51 is disposed in the deepest portion 81. Therefore, when the drainage pump 82 is operated, the siphon pipe 51 has the drainage portion 54 disposed in the deepest portion 81 of the drainage pit 43. Therefore, if the deepest portion 81 having a small volume is filled with water, the siphon The inside of the pipe 51 is quickly filled with water, and the water in the drainage groove 42 can be discharged to the outside in a short time.

  In the third embodiment, the deepest portion 81 is provided by deepening a part of the bottom surface 43a of the drain pit 43. However, the present invention is not limited to this configuration. You may provide the deepest part by making a part or all into an inclined surface.

  In the above-described embodiment, the space portion S is provided between the base plates 31 and 32 and the retaining wall 34, and the slope 41 and the drainage groove 42 are provided on the lower base plate 31 below the space portion S. Although the water intake port 53 of the siphon pipe 51 is disposed in the drainage groove 42, it is not limited to this configuration. For example, the lower portion of the space S, that is, the inner side of the retaining wall 34 on the lower base plate 31 may be used as the drainage groove without providing the slope 41 and the drainage groove 42.

  Further, in the above-described embodiment, the submergence prevention structure of the seismic isolation building according to the present invention is applied to the building of a pressurized water reactor. However, the structure is applied to a boiling water reactor (BWR) building. If it is a light water reactor, it may be applied to any reactor building. Furthermore, in the above-described embodiment, the building is a reactor containment vessel, but it may be a general building such as a building or a tower.

11 Reactor containment vessel (structure)
DESCRIPTION OF SYMBOLS 12 Pressurized water reactor 13 Steam generator 14 Pressurizer 21 Base plate 22 Ground 23 Ground 24 Recessed part 31 Lower base plate 31a Upper surface part 32 Upper base plate 33 Seismic isolation device 34 Retaining wall 35 Space part 36 Base isolation structure 36a Multi-layer isolation Seismic structure 36b Lower pedestal 36c Upper pedestal 40, 70, 80 Drainage device 41 Slope 42 Drainage channel 43 Drainage pit (drainage tank)
44 Drain hole 45 Drain pipe 46 Connecting pipe 47 Drain pipe 48 Drain channel 51 Siphon pipe 52 Strainer 53 Water intake 54 Drain port 61 Waterproof cover 71 Drain pipe (drainage tank)
72 Check valve 81 Deepest part 82 Drain pump S Space part H Height

Claims (9)

Lower base version provided on the ground,
An upper foundation plate provided above the lower foundation plate and on which a structure is installed;
A seismic isolation device comprising a seismic isolation structure arranged in a horizontal direction at a predetermined interval between the upper base version and the lower base version;
Drainage grooves provided around the lower base plate,
A siphon pipe for discharging the water in the drainage channel to the outside;
A structure for preventing submergence of a seismic isolation building.   2. The structure for preventing submergence of a seismic isolation building according to claim 1, wherein the siphon tube is disposed below the seismic isolation structure.   A retaining wall surrounding the lower foundation plate and the upper foundation plate is provided, the siphon tube passes through the retaining wall, a water intake port at one end is located above the drainage groove, The drainage prevention structure for a seismic isolation building according to claim 1 or 2, wherein the drainage port is connected to a drainage tank.   The drainage tank is a drainage pit located outside the retaining wall and below the drainage groove, and the drainage port of the siphon pipe is connected to the drainage pit, and the drainage pipe is connected to the drainage pit. The submergence prevention structure of the seismic isolation building according to claim 3, wherein   The seismic isolation building according to claim 4, wherein a plurality of the siphon pipes and the drain pits are arranged at predetermined intervals in a circumferential direction of the retaining wall, and the plurality of drain pits are connected by a connecting pipe. Submergence prevention structure.   The drain tank is a drain pipe located outside the retaining wall and below the drain groove, and a plurality of the siphon pipes are arranged at predetermined intervals in the circumferential direction of the retaining wall, and the drainage of the plurality of siphon pipes 4. The structure for preventing submergence of a seismic isolation building according to claim 3, wherein a mouth is connected to the drain pipe, and a water discharge pipe is connected to the drain pipe.   The said siphon tube is provided with a check valve for preventing a backflow of water to the drainage groove side, and the structure for preventing submergence of a seismic isolation building according to any one of claims 1 to 6. .   The said siphon pipe is provided with a pump that discharges the water in the drainage groove to the outside. The structure for preventing submergence of a seismic isolation building according to any one of claims 1 to 7.   9. The structure for preventing submergence of a seismic isolation building according to claim 8, wherein the drainage tank is provided with a deepest part on a bottom surface, and a drainage port of the siphon pipe is arranged at the deepest part.

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