JP5417230B2 - Seismic isolation building piping equipment - Google Patents

Description

  The present invention relates to a piping facility for a building that has been seismically isolated. For example, circulating water that supplies and drains seawater as a cooling source to a condenser in the same building where the steam exhausted from the steam turbine in the turbine building of a nuclear power plant or thermal power plant is cooled with seawater and condensed. It relates to what is used when laying out discharge facilities.

  In the nuclear power plant, as shown in FIGS. 7 and 8, circulating water having a circulating water intake pipe 3 for supplying seawater as a cooling source to a condenser 5 in the turbine building 4 and a circulating water discharge pipe 6 for draining. Intake and discharge facilities are laid. The circulating water intake pipe 3 and the circulating water discharge pipe 6 of the circulating water intake and discharge facility are laid and filled with filled concrete 11 directly below the turbine building secured by excavation deep underground.

  An installation example of a conventional circulating water intake / discharge pipe will be described with reference to FIGS. 7 and 8. FIG. 7 shows an actual water intake / discharge route focusing on the circulating water intake pipe 3 and the circulating water discharge pipe 6. In FIG. 7, the circulating water pump 2, the circulating water intake pipe 3, and the circulating water discharge pipe 6 exist in the same configuration in three series, but there are also two series.

  Seawater is pumped up by the circulating water pump 2 installed in the seawater pump chamber 1, and the pumped seawater is sent to the condenser 5 through the circulating water intake pipe 3 and exhausted from the turbine 9 in the turbine building 4. It is used for heat exchange of the condenser 5 that cools and condenses the steam, and the seawater after the heat exchange is discharged from the circulating water discharge pipe 6 through the discharge garden 7 and the discharge channel 8 into the sea.

  FIG. 8 is an elevational sectional view of the turbine building 4 provided with the intake / discharge route of FIG. As shown in FIG. 8, a turbine 9 and a condenser 5 that cools steam exhausted from the turbine 9 are installed in the turbine building 4, and the condenser 5 is supplied from the circulating water intake pipe 3. Steam is cooled by seawater, and the seawater used for cooling is discharged through the circulating water discharge pipe 6.

  The circulating water intake pipe 3 and the circulating water discharge pipe 6 take a route that intersects vertically below the turbine building foundation 10, and the periphery of the piping is filled concrete 11.

  2. Description of the Related Art Conventionally, a nuclear power plant employs a structure in which a building body has an earthquake-resistant structure in order to divide and store plant facilities by function in a plurality of buildings and reduce the influence of each building upon an earthquake.

  In particular, in an earthquake-resistant building in a radioactive material handling facility such as a nuclear power plant, the earthquake resistance class of the building is defined according to the importance of earthquake resistance of the equipment to be stored, and the earthquake resistance differs. Buildings that store facilities with high importance are designed ruggedly as seismic class S, and as buildings that contain seismic classes B and C and less important equipment, each is designed with relatively reduced ruggedness. The

  On the other hand, in recent years, a seismic isolation structure for a building has been devised as a means for reducing input energy due to earthquake motion to the building.

  In the seismic isolation structure of the building, it is divided into an upper structure and a lower structure, and between the upper foundation that is part of the upper structure that becomes the building body and the lower foundation that is the lower structure embedded in the ground, Seismic isolation devices such as laminated rubber bearings will be installed.

  One example is disclosed in Patent Document 2. In other words, as disclosed in Patent Document 2, the reactor building and the turbine building are arranged on a common foundation and the seismic isolation structure is applied, thereby improving the seismic resistance and the relative displacement of the piping between the reactor building and the turbine building. Absorption measures can be omitted, and for the circulating water intake and discharge piping that crosses the seismic isolation side and non-isolation side of the turbine building, the non-isolation side has clearance for the relative displacement that occurs during an earthquake and for water discharge There has been proposed a method of absorbing relative displacement by providing a water tank, installing the pump chamber on the seismic isolation side, and connecting the tip of the pipeline extending from the pump chamber to the non-seismic isolation water tank.

  In this way, the seismic force is absorbed by the deformation of the seismic isolation device even if the seismic force is input to the building above the common base as a seismic isolation structure. Seismic force input is reduced.

  In a nuclear power plant that uses a base-isolated building, the seismic force can be greatly reduced, but a large relative displacement occurs between the base-isolated and non-base-isolated building during an earthquake. Therefore, pipes between buildings that have seismic isolation structures and non-base isolation structures (for example, main steam pipes and circulating water intake / drainage pipes) use flexible joints to prevent relative displacement. Measures that can be followed are necessary.

  As a measure for absorbing relative displacement of piping, for example, an example of adopting an accordion-shaped flexible piping in the middle of the piping as in Patent Document 3 or considering that the flexible piping easily buckles even with a small seismic force. As in Patent Document 1, a flow path for flowing liquid is set in the central part of the laminated rubber support, which is a seismic isolation device, and the central part of the laminated rubber bearing is not buckled enough to support the building. It has been proposed to be used as a flow path leading to

  Further, in Patent Document 2, the reactor building and the turbine building are arranged on a common foundation, and the seismic isolation structure is applied to the common foundation, thereby improving the seismic resistance and the space between the reactor building and the turbine building. A technique for laying the piping of the cooling water circulation facility integrally with the lower surface of the common foundation in the space between the common foundation and the lower foundation when making it possible to omit the relative displacement absorption measure of the crossing pipe is shown.

JP 2001-49895 A JP 2006-145392 A JP 2008-25930 A

  As described above, it is advantageous to use the central part of the laminated rubber support as a flow path connected to the pipe in the middle of the transition pipe passed from the non-isolation side to the seismic isolation side in order to suppress easy buckling of the flow path. However, since the laminated rubber bearing is also a seismic isolation device, it is designed with a seismic isolation cycle that is a building response, a building and a supporting load of seismic load. Therefore, compared with the case where there is no such design restriction, the structure becomes large, and the ground excavation amount and cost for installation are disadvantageous.

  In particular, since the circulating water intake pipe 3 and the circulating water discharge pipe 6 have a large diameter among the pipes of the nuclear power plant, a large-diameter flow path connected to the pipe is provided at the center of the laminated rubber support in accordance with the large diameter. In addition, since the seismic isolation function must be secured, the size of the laminated rubber bearing becomes larger, and accordingly, the amount of excavation for securing the installation space increases, and there is a concern about a significant cost increase.

  The excavation amount of the ground is determined by the relationship between the sea level and the height of the condenser upper part in order to reduce the amount of lifting of the dam-up or the siphon operation in the condenser. The amount of excavation increases by the height of the laminated rubber bearing and the height of the pedestal for installing the laminated rubber bearing provided on the upper foundation and the lower foundation.

  Moreover, in the seismic isolation structure shown in Patent Document 2, it becomes possible to absorb the relative displacement of the circulating water intake and discharge equipment, but seawater is drawn into the water tank for intake and drainage on the non-base isolation side. The need for facilities and the isolation of the pump room, which is less important on the seismic isolation side, will lead to significant cost increases.

  In the seismically isolated building underfloor piping equipment or the circulating water intake and drainage equipment of the condenser in the turbine building that has been seismically isolated, the piping that crosses the seismic isolation side and the non-isolation side is exempted during an earthquake. A relative displacement occurs between the seismic side and the non-seismic side, so that the relative displacement is absorbed, and a structure that is advantageous for construction of the equipment, suppression of an increase in the amount of excavation under the floor and in the vicinity, and improvement of maintainability. It was desired.

  The object of the present invention is to absorb the relative displacement of the piping across the seismic isolation side and the non-seismic isolation side of the seismically isolated building, and is advantageous for the suppression of the construction of piping facilities and the increase in excavation amount and the improvement of maintenance. To provide a structure.

  Means for achieving the object of the present invention is to support an upper foundation of a building from a lower foundation with a laminated rubber bearing, and connect the pipe supported by the upper foundation and the pipe supported by other than the upper foundation to the laminated rubber bearing. In the seismic isolation building piping facility connected via a relative displacement absorbing piping facility prepared separately from the above, the relative displacement absorbing piping facility includes a laminated structure in which a reinforcing plate and a rubber layer are stacked, A seismic-isolated building piping facility characterized in that a flow path penetrating in the direction of stacking is provided, and the flow path is connected to both the connected pipes.

  According to the present invention, the relative displacement absorbing piping equipment that constitutes the flow path between the base on the seismic isolation side and the non-base isolation side is set by the base isolation cycle and the support load that are the building response, and the design conditions of the base isolation device The flow path connection at the crossing part is achieved with a laminated structure in which a reinforcing plate and a rubber layer that are difficult to buckle are laminated, and can be configured with design conditions set mainly by relative displacement and internal pressure. As a result, the structure required to absorb the relative displacement is smaller than that of the seismic isolation device that also serves as the flow path of the portion.

  Further, since the structure becomes small, a space required when a structure for absorbing relative displacement is adopted becomes small, so that it is possible to reduce the amount of material at the time of construction.

  Furthermore, since the relative displacement absorbing piping equipment prepared separately from the laminated rubber bearing does not require the strength to support the upper foundation, the relative displacement absorbing piping is a laminated structure in which a reinforcing plate and a rubber layer are laminated. When the equipment is configured, the flow path inside the laminated structure can be designed to have a large diameter, so that the flow path can be widened and can be applied to a large-diameter pipe.

  Furthermore, the amount of excavation can be reduced as compared with the case where the piping is buried under the building foundation, and the filling concrete around the piping under the building foundation is unnecessary, so that the construction is simplified.

  In addition, since maintenance on the piping placed between the upper foundation and the lower foundation and relative displacement absorbing piping equipment is possible using the space between the upper foundation and the lower foundation, compared to the case where it is buried under the foundation. Maintainability is improved.

It is a longitudinal cross-sectional view of the turbine building provided with the water intake / discharge route by Example 1 of this invention. It is a lower basic top view of the turbine building provided with the intake / discharge route by Example 1 of the present invention. It is the upper basic plane of a turbine building provided with the water intake / discharge route by Example 1 of this invention, and a water discharge route figure. It is a longitudinal cross-sectional view which shows the connection method of the relative displacement absorption piping equipment of Example 1 of this invention. It is a comparison figure of the relative displacement absorption piping installation of this invention, and a laminated rubber bearing. It is a longitudinal cross-sectional view which shows the connection method of the relative displacement absorption piping installation by Example 2 of this invention. It is the whole route figure of the intake / discharge route by a prior art. It is a longitudinal cross-sectional view of the turbine building provided with the water intake / discharge route of FIG.

  Examples of the present invention will be described below.

  An example of the installation of circulating water intake / drainage pipes connected to the equipment in the turbine building 4 of the nuclear power plant in the embodiment of the present invention is the same as that shown in FIGS. As shown in FIG. 1 and FIG. 2, the circulating water intake / discharge piping system includes three series of circulating water pumps 2-circulating water intake pipes 3-circulating water discharge pipes 6 with the same configuration.

  The circulating water intake / drainage piping system, as before, pumps up seawater by the circulating water pump 2 installed in the seawater pump room, and the pumped seawater passes through the circulating water intake pipe 3 to the condenser 5 in the turbine building. The seawater after the heat exchange is discharged from the circulating water discharge pipe 6 shown in FIG. 3 to the sea through the discharge garden 7 and the discharge channel 8.

  As shown in FIG. 1, a turbine 9 and a condenser 5 for cooling steam exhausted from the turbine 9 are installed in the turbine building 4, and the condenser 5 is supplied from a circulating water intake pipe 3. Steam is cooled by seawater, and the seawater used for cooling is discharged through the circulating water discharge pipe 6.

  In addition, the circulating water intake pipe 3 and the circulating water discharge pipe 6 take a route that intersects vertically below the floor of the turbine building 4.

  As shown in FIG. 1, the turbine building 4 is a seismic isolation building, and a pedestal 14 is constructed so that the upper foundation 12 whose upper side is a floor and the lower foundation 13 on the lower side face each other. Has been. A laminated rubber bearing 15 is installed between the pedestals 14.

  Further, the circulating water intake pipe 3 and the circulating water discharge pipe 6 are routed between the upper foundation 12 and the lower foundation 13, and the relative displacement absorbing piping facility 16 is used to connect the piping on the upper foundation 12 side and the lower foundation 13 side. By connecting the pipes, the relative displacement between the upper foundation 12 and the lower foundation 13 that is generated when the ground motion is input to the seismic isolation building is absorbed by the deformation performance of the relative displacement absorbing piping equipment 16, and the circulating water The intake and discharge pipe will not break.

  The sum of the height of the laminated rubber support 15 and the height (vertical dimension) of the pedestal 14 installed on the upper foundation 12 and the lower foundation 13 is the upper limit of the height, and the relative displacement from the width between the pedestal 14 installations. The width excluding can be used as a space for laying the circulating water intake / discharge pipe.

  About a height direction, it becomes possible to ensure the height required for installation of circulating water intake / drainage piping by adjusting pedestal 14 height.

  In addition, since the space between the upper foundation 12 and the lower foundation 13 is designed to ensure the height in consideration of management and replacement of the laminated rubber bearing 15, the same applies to the circulating water intake and discharge pipes installed in the same space. Maintenance will be improved because workers can access.

  FIG. 2 is a bottom plan view of the turbine building having the intake / discharge route according to the first embodiment of the present invention. The circulating water intake pipe 3 extends from the circulating water pump 2 to the bottom of the condenser 5 and is connected to the turbine building 4. The pedestal 14 arranged on the lower foundation 13 passes between the pedestals 14 and is supported by the lower foundation, and is connected to the circulating water intake pipe 3 supported by the upper foundation 12 via the relative displacement absorbing piping facility 16.

  The circulating water intake pipe 3 is connected to the relative displacement absorbing piping facility 16 when it rises upward from below the condenser 5.

  FIG. 3 is an upper basic plane and a water discharge route diagram of the turbine building having the water intake / discharge route according to the first embodiment of the present invention.

  The circulating water discharge pipe 6 is connected from the bottom of the condenser 5 to the outside of the turbine building 4 over the lower surface of the upper foundation 12 and to the discharge garden 7 installed at a position relatively higher than the upper foundation 12. At the raised position, it is connected to the relative displacement absorbing piping facility 16.

  FIG. 4 shows a longitudinal section of the connection location of the relative displacement absorbing piping facility 16 in the circulating water intake pipe 3 described in FIGS. 1 and 2. The circulating water intake pipe 3 of the lower foundation 13 led to the bottom of the condenser 5 stands up and is connected to the relative displacement absorbing piping equipment 16. The relative displacement absorbing piping equipment 16 is connected to the circulating water intake pipe 3 of the upper foundation 12. The circulating water intake pipe 3 of the upper foundation 12 passes through the upper foundation 12 and is connected to the condenser 5.

  FIG. 5 is a diagram comparing the laminated rubber support 15 in FIG. 5A and the relative displacement absorbing piping facility 16 in FIG. 5B according to the first embodiment of the present invention. The relative displacement absorbing piping facility 16 and the laminated rubber support 15 are both cylindrical, and are formed as an assembly having a structure in which the rubber layers 19 and the reinforcing plates 20 are alternately overlapped to prevent buckling, and flanges are provided at the upper and lower ends of the assembly. 18 is provided, and the rubber layer 19, the reinforcing plate 20, and the flange 18 are integrated.

  The laminated rubber support 15 and the relative displacement absorbing piping facility 16 have a structure in which the rubber layers 19 and the reinforcing plates 20 are alternately laminated to absorb a large variation and hardly buckle. However, the design conditions for the rubber layer 19 and the reinforcing plate 20 differ between the laminated rubber support 15 and the relative displacement absorbing piping facility 16. That is, for the laminated rubber bearing 15 that controls the function of the seismic isolation device for the turbine building, the design conditions are set by the seismic isolation cycle and the supporting load that are the building response related to the earthquake, whereas the relative displacement absorbing piping facility 16 The design conditions of the turbine building do not control the seismic isolation function for the turbine building, so there is no restriction on the seismic isolation cycle and support load that will be the response of the building, and the design conditions are set according to the relative displacement and internal pressure. Compared to the structure that combines the seismic isolation function and the flow path function, the size reduction of the structure by function distribution has been achieved.

  In the relative displacement absorbing piping facility 16, a flow path 17 having a coating with excellent corrosion resistance is provided in the center portion so as to penetrate in the stacking direction of the rubber layer 19 and the reinforcing plate 20. The rubber material of the rubber layer 19 of the relative displacement absorbing piping facility 16 is the same rubber material as that of the laminated rubber support 15, but the total thickness of the rubber layer 19 is thicker than that of the laminated rubber support 15, and the total thickness of the reinforcing plate 20 is increased. By reducing the thickness, the deformation performance is improved as compared with the laminated rubber support 15, and the risk of breakage prior to the laminated rubber support 15 is avoided.

  Unlike the laminated rubber support 15, the relative displacement absorbing piping facility 16 does not need to support the vertical load of the turbine building, so the thickness of the reinforcing plate 20 can be reduced. It becomes possible to do.

  As shown in FIG. 4, the relative displacement absorbing piping facility 16 is fixed to a pipe flange portion provided at the end of the circulating water intake pipe 3 as shown in FIG. Used as a connection channel. For the circulating water discharge pipe 6 shown in FIGS. 1 and 3, similarly, the portion of the circulating water discharge pipe 6 between the upper and lower foundations is laid outside the turbine building 4 that is supported by the base isolation. The portion of the water discharge pipe 6 is connected by a relative displacement absorption piping facility 16.

  As described above, the circulating water intake / discharge pipe can be laid between the upper foundation 12 and the lower foundation 13, and the amount of excavation, the filling concrete 11, or the buried concrete required when burying under the turbine building foundation 10. Since no backfilling is required, it is possible to simplify the civil engineering work and shorten the construction period.

  FIG. 6 is a longitudinal sectional view showing a connection state of the relative displacement absorbing piping facility according to the second embodiment of the present invention. In FIG. 6, as an example of connecting the circulating water intake pipe 3 on the upper foundation 12 side and the circulating water intake pipe 3 on the lower foundation side, an example in which a plurality of relative displacement absorption piping facilities 16 are connected in parallel is used. Show.

  In this connection, the circulating water intake pipe 3 of the upper foundation 12 and the circulating water intake pipe 3 of the lower foundation 13 are arranged in parallel with each other at an interval in the vertical direction and their pipe ends are closed. Between the parts of the circulating water intake pipes 3 arranged in parallel, the three relative displacement absorption piping facilities 16 shown in the first embodiment are arranged in parallel, and the upper foundation is formed by the three relative displacement absorption piping facilities 16. The parallel arrangement part of 12 circulating water intake pipes 3 and the circulating water intake pipe 3 of the lower foundation 13 is connected.

  For this connection, the circulating water intake pipe 3 of the upper foundation 12 and the circulating water intake pipe 3 of the lower foundation 13 have pipe flanges to which the flanges 18 of the relative displacement absorbing piping equipment 16 are connected in parallel arrangement portions. Is provided. Connect the circulating water discharge pipe in the same way.

  Thus, even when the diameter of the flow path 17 of the relative displacement absorption piping facility 16 is less than the required flow path diameter due to manufacturing restrictions or the like, the laying configuration of the circulating water intake / discharge pipe by the relative displacement absorption piping facility 16 is Applicable.

  As described above, the configuration of each embodiment of the present invention has the following features. In other words, when the circulating water intake / drainage pipe crosses between the upper foundation on the seismic isolation side and the lower foundation on the non-isolation side, these pipes are placed on the lower surface of the upper base on the seismic isolation side and lowered on the non-isolation side. By placing it on the upper surface of the foundation, piping is concentrated in the space under the building, which is required for seismic isolation.

  In addition, the rubber material and the reinforcing plate which are made of the same rubber material as the laminated rubber bearing used for seismic isolation of the nuclear power plant are alternately laminated, and the flange members are joined to the upper and lower end surfaces, resulting in excellent corrosion resistance. The upper foundation pipe and the lower foundation pipe are connected to each other by a relative displacement absorbing piping facility having a structure in which a flow path extending in the vertical direction and having a coating is provided in the center.

  Further, as a feature of only the second embodiment, when the diameter of the flow path of the above-mentioned relative displacement absorbing piping facility is less than the required diameter due to a limitation due to the manufacturing capacity, a plurality of piping members are arranged in parallel. By arranging it, the necessary flow rate is secured.

  According to each embodiment of the present invention having such a characteristic configuration, the circulating water intake / drainage pipe is embedded under the turbine building foundation by consolidating the pipe in the space under the building required for seismic isolation. Compared to the case, the amount of excavation can be reduced, and the filling concrete around the piping under the turbine building foundation becomes unnecessary, so that the construction is simplified.

  Furthermore, since the seismic isolation building is designed to allow workers to enter between the upper foundation and the lower foundation for the maintenance of the seismic isolation device, circulating water placed between the upper foundation and the lower foundation. Similarly, maintenance is possible for the intake and discharge pipes, so that maintainability is improved as compared with the case where the pipe is buried under the foundation.

  Also, the relative displacement absorption piping equipment arranged to absorb the relative displacement in the circulating water intake / discharge pipe is made of the same material as the laminated rubber bearing that determines the relative displacement with respect to the relative displacement generated by seismic isolation. By making the total rubber thickness thicker than the bearing, it is possible to take a larger allowable displacement than the laminated rubber bearing, and therefore it is possible to avoid the circulating water intake / drainage pipe breaking before the laminated rubber bearing.

  Unlike the laminated rubber bearing, the relative displacement absorbing piping equipment does not need to maintain the axial force. Therefore, the thickness of the reinforcing plate of the relative displacement absorbing piping equipment can be made thinner than that of the laminated rubber bearing. Even when the total rubber thickness is made thicker than the laminated rubber bearing, the member height can be made lower than that of the laminated rubber bearing.

  Although only the effect of Example 2 is achieved, it is necessary to install a plurality of relative displacement absorption piping facilities even when the flow path of the relative displacement absorption piping facility is less than the diameter of the circulating water intake / drainage piping required. A flow rate can be secured.

  As described above, in the example in which the present invention is applied to the laying technology of the circulating water intake and discharge facility of the nuclear power plant, the space between the upper foundation on the seismic isolation side and the lower foundation on the non-seismic isolation side of the turbine building having the seismic isolation structure is provided. It is possible to follow the relative displacement between the seismic isolation side and the non-seismic isolation side with crossing piping, and it is suitable for reduction of excavation amount, miniaturization of relative displacement absorbing piping equipment, suppression of buckling, and improvement of maintenance. Can provide circulating water intake and discharge equipment for water tanks.

  The present invention is used, for example, for laying piping of circulating water intake and discharge equipment under a turbine building of a nuclear power plant.

DESCRIPTION OF SYMBOLS 1 Seawater pump room 2 Circulating water pump 3 Circulating water intake pipe 4 Turbine building 5 Condenser 6 Circulating water drain pipe 7 Discharge garden 8 Discharge channel 9 Turbine 10 Turbine building foundation 11 Filled concrete 12 Upper foundation 13 Lower foundation 14 Pedestal 15 Lamination Rubber bearing 16 Relative displacement absorbing piping equipment 17 Flow path 18 Flange 19 Rubber layer 20 Reinforcing plate

Claims (3)

The upper foundation of the building is supported from the lower foundation by a laminated rubber bearing in which rubber layers and reinforcing plates are alternately stacked, and the pipe supported by the upper foundation and the pipe supported by other than the upper foundation are laminated. In the seismic isolation building piping facility connected via the relative displacement absorbing piping facility prepared separately from the rubber bearing,
The relative displacement absorbing piping facility is provided with a flow passage penetrating in the direction of the lamination in a laminated structure in which a reinforcing plate and a rubber layer are laminated, and the flow passage is connected to both pipes to be connected. In addition, a seismic isolation building piping system characterized by having a structure in which the total thickness of the rubber layer is increased and the total thickness of the reinforcing plate is reduced compared to the laminated rubber support .   2. The laminated structure according to claim 1, wherein as relative displacement absorbing piping equipment, rubber layers and reinforcing plates are alternately laminated, and flanges connected to the piping side are integrally provided at upper and lower ends of the laminated structure. A seismic-isolated building piping facility, characterized in that a flow path is formed by applying an anticorrosive coating to the inner surface of the flow path provided in an integral structure of a flange and a flange.   The piping equipment for a seismic isolation building according to any one of claims 1 to 2, wherein a plurality of the relative displacement absorbing piping equipments are used in parallel to connect the two pipes. .

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