JP2011117578A - Piping connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping connection structure that can absorb relative displacement in a horizontal direction while maintaining pressure resistance and watertightness as piping. <P>SOLUTION: The piping connection structure 10 includes a first metal ring 11 and a second metal ring 12 relatively slidable by a structure (a separating structure) in which the first metal ring 11 and second metal ring 12 are separated with clearances 14. As a result, the first metal rings 11 are mutually slidable by maximum about 100 mm (two parts of the clearance 14). Since the piping connection structure 10 is a laminated structure, if there are 11 layers (10 sliding parts), for instance, relative horizontal displacement of maximum 1,000 mm (1 m) can be absorbed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pipe connection structure, and more particularly to a pipe connection structure provided between a building pipe and a foundation pipe of a nuclear power plant building having a seismic isolation structure.

  Recently, it has been considered to make the nuclear power plant seismic isolation. In such a base-isolated nuclear plant, even if the ground and foundation are displaced greatly during an earthquake, the nuclear plant building is not displaced so much (the absolute displacement is small) and absorbs the relative displacement between the building and the foundation (relative By allowing the displacement, it is possible to greatly improve the earthquake resistance of the nuclear power plant building and the equipment installed therein (for example, Patent Document 1).

  By the way, the nuclear power plant has a circulating water system function for supplying cooling water taken from outside to cooling equipment such as a condenser, cooling turbine exhaust and drain flowing into the condenser, and discharging the water outside the plant. Prepare. In the event of an earthquake, the building responds separately from the surrounding ground and foundation, so that the building and the foundation are relatively displaced. Therefore, it becomes a problem how to make the connection between the piping in the building and the piping in the foundation embedded in the ground.

  Generally, a flexible connection piping structure such as an expansion joint is known as a pipe connection structure capable of absorbing displacement. Large-scale piping connection structures in nuclear power plants are required to ensure a high level of safety and reliability. That is, sufficient deformation absorbability is required while satisfying sufficient pressure resistance and water tightness. Rubber expansion joints are used in actual nuclear power plants.

  However, when the seismic isolation structure is applied to the foundation mat of a nuclear power plant, the relative displacement between the building and the foundation that occurs at the time of the earthquake becomes larger than when the seismic isolation structure is not applied. At this time, even if a conventional rubber expansion joint is applied to the pipe connection structure, a sufficient displacement absorbing effect cannot always be obtained. In order to spread seismic isolation in nuclear power plants, it is urgent to develop a pipe connection structure that absorbs relative displacement by allowing the displacement of the pipe connection structure itself.

  A technique for solving the above problem is disclosed in Patent Document 2. The cooling water circulation facility of Patent Document 2 is composed of a pipe in the foundation, a water tank provided in the foundation, and a building pipe provided on the building side between the water tank and the cooling equipment. A series of cooling water circulations inside and outside the plant by connecting the piping in the foundation and the piping in the building in such a way that seismic isolation displacement can be absorbed through the water tank by inserting the part into the tank so as to allow relative displacement in the horizontal direction. The route is configured.

JP 2002-107480 A JP 2006-145392 A

  The technique of patent document 2 can absorb a relative displacement by moving the front-end | tip part of building piping in a horizontal direction in a water tank at the time of an earthquake.

  However, the technique of Patent Document 2 is not a technique of the pipe connection structure itself. In addition, a large cost is required such as a large water tank. On the other hand, development of the piping connection structure itself is desired.

  The objective of this invention is providing the piping connection structure which can absorb the relative displacement of a horizontal direction, maintaining the pressure | voltage resistance and watertightness as piping.

  (1) In order to achieve the above object, the present invention provides a pipe connection structure provided between a building pipe and a foundation pipe of a nuclear power plant building having a seismic isolation structure, and a plurality of metal rings, A gasket interposed between the metal rings, the metal rings are fitted and stacked, and the metal ring is slidable in a horizontal direction.

  In the present invention configured as described above, the pressure resistance can be ensured by laminating metal rings having sufficient strength. Watertightness can be secured by the elastic gasket being compressed by the building's own weight and functioning as a sealing material.

  On the other hand, since the metal rings are stacked so as to be slidable in the horizontal direction, a large displacement of the pipe connection structure itself is allowed, and as a result, a relative displacement between the large building and the foundation can be absorbed. At this time, the pipe connection structure maintains stability by the fitting structure, and the pressure resistance and water tightness as the pipe can be maintained even during an earthquake.

  That is, the pipe connection structure according to the present invention can absorb the relative displacement in the horizontal direction while maintaining the pressure resistance and water tightness as the pipe.

  Moreover, the maximum displacement amount to be absorbed can be easily adjusted by adjusting the height of the metal ring and the number of stacked layers.

  (2) In the above (1), preferably, the plurality of metal rings include a first metal ring having recesses in an upper part and a lower part, and a second metal ring fitted in the recesses of the first metal ring. The gasket is interposed between the first metal ring and the second metal ring.

  Thereby, metal rings (1st metal ring, 2nd metal ring) are fitted and laminated | stacked.

  (3) In order to achieve the above object, the present invention provides a pipe connection structure provided between a building piping and a foundation piping of a nuclear power plant building having a seismic isolation structure, and a plurality of metal rings, A plurality of gaskets, wherein the metal ring and the gasket are fitted and stacked, and the plurality of metal rings are slidable.

  In the present invention configured as described above, the pressure resistance can be ensured by laminating metal rings having sufficient strength. Watertightness can be secured by the elastic gasket being compressed by the building's own weight and functioning as a sealing material.

  On the other hand, since the metal rings are stacked so as to be slidable in the horizontal direction, a large displacement of the pipe connection structure itself is allowed, and as a result, a relative displacement between the large building and the foundation can be absorbed. At this time, the pipe connection structure maintains stability by the fitting structure, and the pressure resistance and water tightness as the pipe can be maintained even during an earthquake.

  That is, the pipe connection structure according to the present invention can absorb the relative displacement in the horizontal direction while maintaining the pressure resistance and water tightness as the pipe.

  Moreover, the maximum displacement amount to be absorbed can be easily adjusted by adjusting the height of the metal ring and the number of stacked layers.

  (4) In the above (3), preferably, the plurality of metal rings have recesses in an upper part and a lower part, and the gasket is fitted in the recesses of the metal ring.

  Thereby, a metal ring and a gasket are fitted and laminated | stacked.

  (5) In the above (3), preferably, the plurality of metal rings have convex portions at the upper and lower portions, the gasket has concave portions at the upper and lower portions, and the convex portions of the metal rings are fitted. Match.

  Thereby, a metal ring and a gasket are fitted and laminated | stacked.

  (6) In the above (1) to (5), preferably, the gasket is an elastic body and is reduced and displaced by its own weight.

  Thereby, the gasket is compressed and functions as a sealing material, and the pipe connection structure can ensure water tightness.

  (7) In the above (1) to (5), preferably, the metal ring has a displacement limiting function for limiting a horizontal displacement amount of another metal ring.

  As a result, the metal ring does not come off during an earthquake, and the laminated structure can be maintained and the stability can be maintained.

  According to the pipe connection structure of the present invention, it is possible to absorb horizontal relative displacement while maintaining pressure resistance and water tightness as the pipe.

1 is a schematic diagram of a nuclear power plant to which a pipe connection structure is applied. It is a disassembled perspective sectional view of the principal part of the piping connection structure concerning a 1st embodiment. It is sectional drawing of the principal part of piping connection structure. It is drawing explaining the effect | action of the piping connection structure at the time of an earthquake. It is a perspective sectional view of the connection part of a pipe connection structure and a building indoor pipe. It is sectional drawing of the principal part of the piping connection structure which concerns on 2nd Embodiment. It is drawing explaining the effect | action of the piping connection structure at the time of an earthquake. It is an expanded sectional view of a main member. It is sectional drawing of the principal part of the piping connection structure which concerns on 3rd Embodiment. It is sectional drawing of the principal part of the piping connection structure which concerns on 4th Embodiment. It is sectional drawing of the principal part of the piping connection structure which concerns on 5th Embodiment. It is sectional drawing of the principal part of the piping connection structure which concerns on 6th Embodiment.

  The pipe connection structure of each embodiment of the present invention will be described in detail with reference to the drawings. The first to third embodiments correspond to claim 1, and the fourth to sixth embodiments correspond to claim 3. That is, 1st-3rd embodiment fits metal rings, and 4th-6th embodiment fits a metal ring and a gasket. The feature of the present invention that the metal ring is configured to be slidable in the horizontal direction is common.

<First Embodiment>
~Constitution~
FIG. 1 is a schematic diagram of a nuclear power plant to which the pipe connection structure of the first embodiment is applied. A building 1 that houses equipment such as a nuclear reactor is supported on a foundation 3 installed on a bedrock 2 via a seismic isolation device 4. The seismic isolation device 4 has a function of insulating the building 1 and the foundation 3. Even if the foundation 3 is largely displaced, the building 1 is not displaced as much as the foundation 3 (the absolute displacement is small). As a result, the building 1 A large relative displacement occurs between the base 3 and the foundation 3. Thereby, the seismic wave propagated through the ground is attenuated by the seismic isolation device 4, the magnitude of the seismic wave transmitted to the building 1 is reduced, and the seismic response of the equipment accommodated in the building 1 is not a seismic isolation structure. Compared to the case, it is greatly reduced.

  On the other hand, a cooling facility such as a condenser 5 is installed in the nuclear power plant. The cooling facility takes cooling water from outside the nuclear plant and discharges the cooled cooling water outside the nuclear plant. The condenser 5 is a device that cools and condenses the steam after taking out work by a turbine (not shown) and returns it to a low-pressure saturated liquid. An indoor pipe 6 is connected to the condenser 5, and an internal pipe 7 is connected to the indoor pipe 6 via a pipe connection structure 10. Seawater is often used as cooling water from outside the nuclear power plant.

  In this way, the intake pipe is configured so that the high-pressure seawater pumped up is supplied to the condenser 5 through the foundation internal pipe 7, the pipe connection structure 10, and the interior pipe 6. In addition, about the water discharge piping, it is comprised similarly and abbreviate | omits neither illustration nor description.

  2 is an exploded perspective cross-sectional view of the main part of the pipe connection structure 10, FIG. 3 is a cross-sectional view of the main part of the pipe connection structure 10, and FIG. 4 explains the operation of the pipe connection structure 10 during an earthquake. It is a drawing.

  The pipe connection structure 10 of the first embodiment includes a first metal ring 11, a second metal ring 12, and a gasket 13 as main components.

  The first metal ring 11 has an inner diameter of about 2600 mm (corresponding to the inner diameter of the pipes 6 and 7), and the cross-sectional shape thereof is substantially H-shaped. That is, the first metal ring 11 has recesses 11a and 11b at the upper and lower portions.

  The second metal ring 12 has an inner diameter of about 3300 mm (slightly larger than the inner diameter of the first metal ring 11), and has a substantially rectangular cross-sectional shape.

  The gasket 13 is a ring made of an elastic body (for example, rubber material), has an inner diameter of about 3300 mm (corresponding to the inner diameter of the second metal ring 12), and has a substantially rectangular cross section.

  Then, the second metal ring 12 is fitted into the recesses 11 a and 11 b of the first metal ring 11 (fitting structure), and the gasket 13 is inserted between the first metal ring 11 and the second metal ring 12. In such a state, the first metal ring 11, the second metal ring 12, and the gasket 13 are laminated (laminated structure).

  In such a laminated state, a horizontal clearance 14 of about 50 mm is formed between the side surfaces of the recesses 11 a and 11 b of the first metal ring 11 and both side surfaces of the second metal ring 12. The total length in the depth direction of the recesses 11a and 11b of the first metal ring 11 is the sum of the height of the second metal ring 12 and the thickness of the two gaskets 13 (considering shortening due to compression described later). It is designed to be shorter than the length, and as a result, a minute vertical clearance 15 is formed between the first metal rings 11.

  In this embodiment, the gasket 13 has a structure in which the edge is cut (not in close contact) with the first metal ring 11 and is in close contact with the second metal ring 12. May be a structure in which the edges of the first metal ring 11 and the second metal ring 12 are cut off. That is, it is only necessary that the edge between the first metal ring 11 and the second metal ring 12 is cut by the edge being cut off at any point (edge cutting structure).

  In the pipe connection structure 10, the first metal ring 11 and the second metal ring 12 are slidable by a relative horizontal clearance 14. As a result, it is possible to slide between the first metal rings 11 at a maximum of two clearances 14 (about 100 mm).

  In addition, the dimension shown above was only what was illustrated for the convenience of description so that a structure may be imaged easily, and is not restrained by this.

  FIG. 5 is a perspective cross-sectional view of a connection portion between the pipe connection structure 10 and the building pipe 6.

  On the bottom surface of the building 1, a floor bottom iron plate 8 having a hole 8 a having a diameter corresponding to the outer diameter of the indoor piping 6 is installed. The floor bottom iron plate 8 is further provided with a circular groove 8b that is slightly larger than the outer diameter of the first metal ring 11. On the other hand, unlike the other first metal rings 11, the first metal ring 16 located in the uppermost layer of the pipe connection structure 10 has only the lower recess 11b, and the upper surface 16a is flat. The inner diameter of the first metal ring 16 is designed to be equal to the outer diameter of the building piping 6.

  The first metal ring upper surface 16 a is in contact with the lower surface of the floor bottom iron plate 8. The building pipe 6 has its tip inserted through the hole 8 a of the floor bottom iron plate, and the outer diameter surface of the tip is in contact with the inner diameter surface of the first metal ring 16. Further, the fixing ring 9a is fitted and welded to the groove 8b of the floor bottom iron plate while contacting the outer diameter surface of the first metal ring 16. Also, the building piping 6 and the first metal ring 16 are bolted by bolts 9b from the inner diameter surface of the building piping 6, and the first metal ring 16 and the fixing ring 9a are bolts 9b from the outer diameter surface of the fixing ring 9a. It is bolted by. Thereby, the piping connection structure 10 and the building interior piping 6 are connected.

  In addition, although illustration is abbreviate | omitted, the connection part of the piping connection structure 10 and the foundation internal piping 7 is also the same structure.

~ Action ~
The effect | action of the piping connection structure 10 at the normal time is demonstrated. High-pressure seawater is supplied as cooling water to the nuclear power plant via the pipe connection structure 10 and is discharged from the nuclear power plant after cooling. Therefore, the pipe connection structure 10 is required to have pressure resistance.

  The clearance 15 between the first metal rings 11 is minute, and most of the cooling water passes through the space formed by the first metal ring 11. The first metal ring 11 has sufficient strength and ensures pressure resistance. Even if the cooling water leaks from the clearance 15, the second metal ring 12 has sufficient strength and ensures pressure resistance.

  At this time, there is little possibility that the gasket 13 touches the cooling water, and even if the gasket 13 touches the cooling water, the portion touching the cooling water is very small, and the pressure of the cooling water hardly affects. Therefore, the pipe connection structure 10 can ensure pressure resistance.

  On the other hand, the pipe connection structure 10 is also required to be watertight. That is, it is not preferable that the cooling water leaks out of the pipe connection structure 10.

  The gasket 13 is an elastic body (for example, rubber material), and is compressed by the weight of the building 1 in the above-described laminated state. As a result, the gasket 13 functions as a sealing material, and the pipe connection structure 10 can ensure water tightness. The gasket 13 itself is also watertight.

  Thus, the pipe connection structure 10 can ensure pressure resistance and water tightness as a pipe.

  The effect | action of the piping connection structure 10 at the time of an earthquake is demonstrated. In a nuclear plant having a seismic isolation structure, the building 1 has an earthquake response different from that of the foundation 2, and thus a large relative displacement may occur. Therefore, the pipe connection structure 10 is required to have a function of absorbing a large relative displacement (allowing displacement of the pipe connection structure 10 itself).

  The pipe connection structure 10 has a clearance 14 and has a structure in which the edges of the first metal ring 11 and the second metal ring 12 are cut (edge cutting structure). However, as a result, the first metal rings 11 can be slid by a maximum of about 100 mm (for two clearances 14). Since the pipe connection structure 10 has a laminated structure, for example, assuming that there are 11 layers (sliding places are 10 places), a horizontal relative displacement of 1000 mm (1 m) at maximum can be absorbed.

  In addition, since the clearance length (for example, 1-1.5m) between the building 1 and the foundation 3 is determined by the seismic isolation design, it is difficult to adjust the clearance length, but the height of the first metal ring 11 and the lamination By adjusting the number, the maximum displacement to be absorbed can be easily adjusted. For example, when the height of the first metal ring 11 is lowered and the laminated structure is 16 layers (sliding places are 15 places), a displacement of a maximum of 1500 mm (1.5 m) can be absorbed.

  Further, the clearance 15 allows the first metal rings 11 to slide smoothly without interfering with each other.

  When the first metal ring 11 and the second metal ring 12 slide, one side surface of the second metal ring 12 is locked to the side surface of the recess 11a of the first metal ring 11 positioned below, and the second metal ring 12 The opposite side surface of the first metal ring 11 is locked to the side surface of the concave portion 11b of the first metal ring 11, and the second metal ring 12 is displaced further in the horizontal direction by the upper and lower first metal rings 11. Limited. That is, the concave portions 11a and 11b of the first metal ring 11 exhibit a displacement limiting function. In other words, it can be said that the first metal ring 11 is further restricted in horizontal displacement by the second metal ring 12. Thereby, the 1st metal ring 11 does not remove | deviate also at the time of an earthquake, and the piping connection structure 10 can maintain a laminated structure, and can maintain stability.

  It is necessary to consider not only the displacement in the horizontal direction but also the displacement in the vertical direction and the displacement in the torsional direction of the pipe connection structure 10 at the time of the earthquake.

  The gasket 13 is an elastic body and can absorb vertical displacement.

  Due to the edge cutting structure described above, the first metal ring 11 and the second metal ring 12 are rotatable with respect to each other, and as a result, the first metal rings 11 can be rotated with each other. Thereby, the displacement of a twist direction can be absorbed.

  Further, even during an earthquake, the clearance 15 between the first metal rings 11 is kept minute, and the pressure resistance similar to the normal time can be maintained. The gasket 13 functions as a sealing material and can maintain the same water tightness as usual.

~effect~
In the first embodiment configured as described above, the pressure resistance can be secured by the strength of the first metal ring 11 in a normal state. Moreover, the gasket 13 functions as a sealing material and can secure watertightness.

  In the event of an earthquake, a large horizontal relative displacement can be absorbed by the clearance 14, the edge cutting structure, and the laminated structure. In addition, the relative displacement in the vertical direction and the twist direction can be absorbed. By adjusting the height of the metal ring and the number of layers, the maximum amount of displacement to be absorbed can be easily adjusted. On the other hand, pressure resistance and watertightness as piping are maintained even during an earthquake.

  That is, the pipe connection structure 10 can absorb a large horizontal relative displacement while maintaining pressure resistance and water tightness as a pipe even during an earthquake.

  Further, the clearance 15 is very small and the gasket 13 is less likely to come into contact with the cooling water. The pipe connection structure 10 is more resistant to pressure and gaskets than the pipe connection structures 50 and 60 of the fifth to sixth embodiments described later. Excellent effect in terms of preventing corrosion.

Second Embodiment
6 is a cross-sectional view of the main part of the pipe connection structure 20 of the second embodiment, FIG. 7 is a drawing for explaining the operation of the pipe connection structure 20 at the time of an earthquake, and FIG. FIG. The first metal ring 21 and the second metal ring 22 of the pipe connection structure 20 of the second embodiment are different in cross-sectional shape from the first metal ring 11 and the second metal ring 12 of the pipe connection structure 10 of the first embodiment. To do.

  The first metal ring 21 has a substantially HH shape with two H-shaped cross sections, and has recesses 21a1 and 21a2 at the top and recesses 21b1 and 21b2 at the bottom.

  The second metal ring 22 has a substantially H-shaped cross section, and has two convex portions 22a1 and 22a2 at the upper portion and two convex portions 22b1 and 22b2 at the lower portion. As a result, a recess 22a3 is formed between the protrusions 22a1 and 22a2, and a recess 22b3 is formed between 22b1 and 22b2. That is, the second metal ring 22 is the same as the first metal ring 11 of the first embodiment as a result.

  The gasket 23 is composed of gaskets 23a and 23b. Each of the gaskets 23a and 23b is a ring made of an elastic body, and has a substantially rectangular cross-sectional shape. The ring diameter of the gasket 23a is larger than the ring diameter of the gasket 23b.

  Then, the convex portion 22b1 of the second metal ring 22 is fitted into the concave portion 21a1 of the first metal ring 21, the convex portion 22b2 of the second metal ring 22 is fitted into the concave portion 21a2 of the first metal ring 21, and the first The convex portion 22a1 of the second metal ring 22 is fitted into the concave portion 21b1 of the metal ring 21, the convex portion 22a2 of the second metal ring 22 is fitted into the concave portion 21b2 of the first metal ring 21, and the gasket 23a is connected to the concave portion 21a1. Between the convex portion 22b1 and between the concave portion 21b1 and the convex portion 22a1, the gasket 23b is inserted between the concave portion 21a2 and the convex portion 22b2, and between the concave portion 21b2 and the convex portion 22a2, and like this In this state, the first metal ring 21, the second metal ring 22, and the gasket 23 are laminated.

  That is, the pipe connection structure 10 of the first embodiment has a single fitting structure, whereas the pipe connection structure 20 of the second embodiment has a double fitting structure.

  Similarly to the first embodiment, a horizontal clearance 24 (corresponding to the clearance 14) and a minute vertical clearance 25 (corresponding to the clearance 15) are formed, and other configurations are substantially the same as in the first embodiment. It is.

  In the second embodiment configured as described above, the pipe connection structure 20 can absorb a large relative displacement in the horizontal direction while maintaining pressure resistance and water tightness as a pipe, and the same effect as in the first embodiment. Is obtained.

  Furthermore, since the pipe connection structure 20 has a double fitting structure, the pipe connection structure 20 can improve pressure resistance and water tightness compared to the pipe connection structure 10 of the first embodiment.

  In addition, since the pipe connection structure 20 has a double fitting structure, the first metal ring 21 is less likely to come off during an earthquake as compared with the pipe connection structure 10 of the first embodiment. 20 can improve stability.

<Third Embodiment>
FIG. 9 is a cross-sectional view of the main part of the pipe connection structure 30 of the third embodiment. The metal ring of the pipe connection structure 10 of the first embodiment is composed of the first metal ring 11 and the second metal ring 12, whereas the metal ring of the pipe connection structure 30 of the third embodiment is only the metal ring 31. Consists of The cross-sectional shape of the metal ring is also different.

  The metal ring 31 has a shape in which the lower center portion of the cross-sectional shape is substantially convex, that is, has a convex portion 31a at the upper portion and a concave portion 31b at the lower portion.

  The gasket 33 is a ring made of an elastic body, and its cross-sectional shape is substantially rectangular.

  And the convex part 31a of the lower metal ring 31 is fitted in the concave part 31b of the upper metal ring 31, and the gasket 33 is inserted between the concave part 31b and the convex part 31a. A ring 31 and a gasket 33 are laminated.

  Similarly to the first embodiment, a horizontal clearance 34 (corresponding to the clearance 14) and a minute vertical clearance 35 (corresponding to the clearance 15) are formed, and other configurations are substantially the same as in the first embodiment. It is.

  In the third embodiment configured as described above, the pipe connection structure 30 can absorb a large relative displacement in the horizontal direction while maintaining pressure resistance and water tightness as the pipe, and the same effect as in the first embodiment. Is obtained.

  Furthermore, the metal ring of the pipe connection structure 30 is composed of only the metal ring 31, and can be configured in a simpler manner than the pipe connection structure 10 of the first embodiment, as a single component. Manufacturing cost can be reduced.

<Fourth embodiment>
FIG. 10 is a cross-sectional view of the main part of the pipe connection structure 40 of the fourth embodiment. In the pipe connection structure 10 of the first embodiment, the metal rings (first metal ring 11 and second metal ring 12) are fitted to each other, whereas in the pipe connection structure 40 of the fourth embodiment, the metal ring 41 and the gasket are fitted. 43 is fitted.

  The metal ring 41 has a substantially H-shaped cross section, that is, has recesses 41a and 41b at the upper and lower portions. The metal ring 41 is substantially the same as the first metal ring 11 of the first embodiment.

  The gasket 43 is a ring made of an elastic body, and its cross-sectional shape is substantially rectangular. The thickness of the gasket 43 (considering shortening due to compression) is the same as the total length of the height of the second metal ring 12 of the first embodiment and the thickness of the two gaskets 13 (considering shortening due to compression). Designed to be That is, the total length in the depth direction of the recesses 41a and 41b of the metal ring 41 is designed to be shorter than the total length of the gasket 43 (considering shortening due to compression). A minute vertical clearance 45 is formed between the rings 41.

  And the gasket 43 is fitted by the recessed parts 41a and 41b of the metal ring 41, and the metal ring 41 and the gasket 43 are laminated | stacked in such a state. In such a laminated state, a horizontal clearance 44 is formed between the side surfaces of the recesses 41 a and 41 b of the metal ring 41 and both side surfaces of the gasket 43.

  That is, the pipe connection structure 40 of the fourth embodiment is obtained by replacing the second metal ring 12 and the gasket 13 of the first embodiment with the gasket 43.

  In the fourth embodiment configured as described above, the pipe connection structure 40 can absorb a large relative displacement in the horizontal direction while maintaining pressure resistance and water tightness as the pipe, and the same effect as in the first embodiment. Is obtained.

  Furthermore, the metal ring of the pipe connection structure 40 is composed only of the metal ring 41, and can be made a simpler configuration compared to the pipe connection structure 10 of the first embodiment, by unifying the constituent members. Manufacturing cost can be reduced.

<Fifth Embodiment>
FIG. 11 is a cross-sectional view of the main part of the pipe connection structure 50 of the fifth embodiment. In the pipe connection structure 10 of the first embodiment, the metal rings (first metal ring 11 and second metal ring 12) are fitted to each other, whereas in the pipe connection structure 50 of the fifth embodiment, the metal ring 51 and the gasket. 53 is fitted.

  The metal ring 51 has a substantially cross-shaped cross section, that is, has convex portions 51a and 51b at the upper and lower portions.

  The gasket 53 is a ring made of an elastic body, and its cross-sectional shape is substantially H-shaped, that is, it has recesses 53a and 53b in the upper part and the lower part.

  And the convex part 51b of the metal ring 51 is fitted to the concave part 53a of the gasket 53, and the convex part 51a of the metal ring 51 is fitted to the concave part 53b of the gasket 53. In such a state, the metal ring 51 and the gasket 53 are fitted. Are stacked.

  In such a laminated state, a horizontal clearance 54 is formed between both side surfaces of the convex portion 51a and the side surface of the concave portion 53b and between both side surfaces of the convex portion 51b and the side surface of the concave portion 53a. The height of the convex portions 51a and 51b of the metal ring 51 is designed to be shorter than the depth of the concave portion 53a of the gasket 53. As a result, the height between the upper surface of the convex portion 51a and the lower surface of the concave portion 53b A minute vertical clearance 55 is formed between the lower surface of the portion 51b and the upper surface of the recess 53a.

  In normal times, the cooling water passes through a space formed by the metal ring 51 and the gasket 53. At this time, the gasket 53 functions as a sealing material. The clearance 55 does not come into contact with the cooling water, and therefore the cooling water does not leak from the clearance 55. Thereby, compared with the pipe connection structure 10 of 1st Embodiment, the pipe connection structure 50 can improve water-tightness.

  In the fifth embodiment configured as described above, the pipe connection structure 50 can absorb a large relative displacement in the horizontal direction while maintaining pressure resistance and water tightness as the pipe, and the same effect as in the first embodiment. Is obtained.

  Furthermore, the pipe connection structure 50 can improve watertightness compared to the pipe connection structure 10 of the first embodiment.

<Sixth Embodiment>
FIG. 12 is a cross-sectional view of the main part of the pipe connection structure 60 of the sixth embodiment. The gasket 53 according to the fifth embodiment is a single unit having a substantially H-shaped cross section, whereas the gasket 63 according to the sixth embodiment includes a gasket 63a and a gasket 63b.

  The metal ring 61 has a substantially cross-shaped cross section, that is, has convex portions 61a and 61b at the upper and lower portions. The metal ring 61 is substantially the same as the first metal ring 51 of the fifth embodiment.

  Each of the gaskets 63a and 63b is a ring made of an elastic body and has a substantially rectangular cross-sectional shape. The ring diameter of the gasket 63a is smaller than the ring diameter of the gasket 63b. A space 63c is formed between the gaskets 63a and 63b.

  Then, the convex portions 61a and 61b of the metal ring 61 are fitted into the space 63c, and in this state, the metal ring 61 and the gasket 63 are laminated, and as a result, a clearance 64 and a clearance 65 are configured. Other configurations are substantially the same as those of the fifth embodiment, and the same effects as those of the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Building 2 Rock bed 3 Foundation 4 Seismic isolation device 5 Condenser 6 Piping in building 7 Piping in foundation 10, 20, 30, 40, 50, 60 Piping connection structure 11, 21 First metal ring 12, 22 Second metal ring 31, 41, 51, 61 Metal ring 13, 23, 23a, 23b, 33, 43, 53, 63, 63a, 63b Gasket 14, 24, 34, 44, 54, 64 Clearance 15, 25, 35, 45, 55 , 65 clearance

Claims (7)

A piping connection structure provided between the piping inside the building of the nuclear power plant building having the seismic isolation structure and the piping inside the foundation,
Multiple metal rings,
A gasket interposed between the metal rings,
The metal rings are fitted and laminated,
A pipe connection structure, wherein the metal ring is slidable in a horizontal direction. In the pipe connection structure according to claim 1,
The plurality of metal rings are:
A first metal ring having recesses at the top and bottom;
A second metal ring fitted in the recess of the first metal ring,
The pipe connection structure, wherein the gasket is interposed between the first metal ring and the second metal ring. A piping connection structure provided between the piping inside the building of the nuclear power plant building having the seismic isolation structure and the piping inside the foundation,
Multiple metal rings,
With multiple gaskets,
The metal ring and the gasket are fitted and laminated,
A pipe connection structure, wherein the plurality of metal rings are slidable. In the pipe connection structure according to claim 3,
The plurality of metal rings have recesses in an upper part and a lower part,
The piping connection structure, wherein the gasket is fitted into a recess of the metal ring. In the pipe connection structure according to claim 3,
The plurality of metal rings have protrusions at the top and bottom,
The said gasket has a recessed part in the upper part and the lower part, and fits the convex part of the said metal ring, The pipe connection structure characterized by the above-mentioned. In the pipe connection structure according to any one of claims 1 to 5,
The piping connection structure according to claim 1, wherein the gasket is an elastic body and is reduced and displaced by its own weight. In the pipe connection structure according to any one of claims 1 to 5,
The pipe connection structure according to claim 1, wherein the metal ring has a displacement limiting function for limiting a horizontal displacement amount of another metal ring.

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