JP5242143B2 - Seismic isolation joint structure, seismic isolation joint used in the seismic isolation joint structure, and construction method of the seismic isolation joint structure - Google Patents

Description

  The present invention relates to a seismic isolation joint structure in which cracks and the like are not damaged even if relative displacement occurs between the ground side and the building side, the seismic isolation joint used for the seismic isolation joint structure, and the seismic isolation The present invention relates to a method for constructing a joint structure.

  Conventionally, the seismic isolation joint structure as shown in FIG. 15 is known (for example, refer patent document 1 etc.).

  In such a conventional seismic isolation joint structure, a building structure in which a seismic isolation device (not shown) is mounted between the building 1 side and the ground 2 side on which the building 1 is placed is mainly possible. A seismic isolation joint 3 made of a polyethylene pipe having flexibility has been proposed.

  The seismic isolation joint 3 includes a pair of horizontal straight pipe portions 3b and 3b mainly located on the building side and the ground side, and a vertical straight pipe portion extending in the vertical direction corresponding to the head drop H in the height direction. 3c, and the horizontal straight pipe portions 3b, 3b and the vertical straight pipe portion 3c are connected by 90 ° bent portions 3d, 3d.

  In addition, a loose flange portion 3a connected to the flange portion 4a of the building side pipe 4 is provided at the end of the horizontal straight pipe portion 3b on the building side, and the ground side pipe 5 extending from the ground 2 side is provided. By connecting a loose flange portion 3e provided at the end of the horizontal straight pipe portion 3b on the ground side to the flange portion 5a, the building-side piping 4 is interposed with the seismic isolation joint 3 interposed therebetween. It is configured to be connected to the ground side pipe 5.

  Next, the effect of this conventional seismic isolation joint structure is demonstrated.

  In the conventional seismic isolation joint structure configured as described above, even if the ground 2 is shaken due to an earthquake or the like, the seismic isolation joint 3 made of the polyethylene pipe having flexibility causes a deformation of the building 1. It is difficult to transmit the displacement of the ground 2 to the side.

  For this reason, the seismic isolation function of the seismic isolation apparatus not shown can be sufficiently exhibited.

In addition, as another conventional seismic isolation joint structure, one using an expensive flexible joint is also known (see, for example, Patent Documents 2, 3, and 4).
Japanese Patent Laid-Open No. 2001-208241 (paragraphs 0006 to 0032, FIG. 1) Japanese Patent No. 2598772 (Detailed Description of the Invention, FIGS. 1 and 2) Japanese Patent No. 3260698 (paragraphs 0017 to 0031, FIG. 1) Japanese Patent No. 3714772 (paragraphs 0010 to 0019, FIG. 2)

  However, in such a conventional seismic isolation joint structure, the vertical straight pipe portion 3c in the vertical direction is connected to the horizontal straight pipe portions 3b and 3b by a pair of upper and lower 90 ° bent portions 3d and 3d. If the relative displacement between the ground 2 and the building 1 is large, the distortion generated in the seismic isolation joint 3 also increases.

  For example, in a general base-isolated apartment (apartment house), a displacement absorption amount is required to be 600 mm in all directions within a horizontal plane.

  For this reason, when the underfloor space formed between the ground 2 and the building 1 cannot be sufficiently secured and the height direction dimension cannot be set large, the height direction dimension H of the vertical straight pipe portion 3c is also small. Thus, the strain increases and cannot be absorbed, and the seismic isolation joint 3 may be plastically deformed, and it is difficult to absorb the displacement of 600 mm.

  Moreover, the flexible joint used for the seismic isolation joint structure of another prior art example was also expensive, and there also existed a problem that construction cost would raise.

  Furthermore, in the case of a universal joint used for clean water, since the inside of the pipe is always filled with water, in addition to its own weight, the weight of this internal water must be supported together with this universal joint.

  However, in the configuration in which the supported portion is fixed and the support rigidity is increased, the movable range of the seismic isolation joint 3 may be narrowed.

  In particular, the height dimension of the space formed between the upper and lower floors has a certain restriction (for example, about 2 m in the case of a general apartment). For this reason, it has been difficult to obtain a sufficient suspending force while securing a displacement absorption amount.

  Therefore, the present invention provides a seismic isolation joint structure that is inexpensive and can be installed in a limited space and can secure the required displacement absorption of 600 mm, and a method for constructing the base isolation joint structure. The challenge is to do.

In order to achieve the above object, the invention described in claim 1 is used in a building structure in which a seismic isolation device is provided between a building side and a ground side on which the building is placed. A seismic isolation joint structure having a base isolation joint that connects a ground side pipe extending from a side and a building side pipe extending from the building side, wherein the base isolation joint is a flexible resin pipe A ground-side straight pipe portion connected to the ground-side pipe and extended; a building-side straight pipe portion connected to the building-side pipe; and the ground-side straight pipe portion And a central straight pipe part connected to the local board side straight pipe part and the building side straight pipe part via a curved pipe part, respectively, in parallel with the building side straight pipe part, is connected to the S-shaped, the ground-side straight pipe portion and, among the building side straight pipe section, at least one end, a flange connecting joint An EF joint is used as a connection part between the ground side straight pipe part or the building side straight pipe part and the flange connection joint, and the connection part connected by the EF joint is sandwiched between And a base- isolated joint structure having a pedestal on which the clamp member is mounted .

  Further, what is described in claim 2 is characterized in that the bent pipe portion is constituted by connecting two 90 ° bend pipes to each other in the seismic isolation joint structure according to claim 1.

  Furthermore, what is described in claim 3 is characterized in that the curved pipe portion is configured by using a U-shaped pipe.

  And what is described in Claim 4 is characterized by the seismic isolation joint structure in any one of Claims 1 thru | or 3 in which the said curved pipe part is connected by butt fusion | fusion.

  Moreover, what was described in Claim 5 is characterized by the seismic isolation joint structure in any one of Claims 1 thru | or 4 in which the said center straight pipe part is connected by EF joint.

Furthermore, those described in claim 6, a connecting portion provided in the central straight tube portion, a metal band member connected to the wire member, according to claim 1 to 5 suspended from the building side Among them, the seismic isolation joint structure described in any one of the above features.

According to a seventh aspect of the present invention, the wire member is supported by a suspension means provided on the building side and engaged so as to be movable in the longitudinal direction of the wire member. The seismic isolation joint structure according to claim 6 , wherein a weight member is suspended from the tip of the member.

And what was described in Claim 8 is a seismic isolation joint which connects the ground side piping extended from the ground side, and the building side piping extended from the building side, Comprising: A ground-side straight pipe portion that is connected to the ground-side pipe and extends, and a building-side straight pipe portion that is connected to the building-side pipe and extends, A central straight pipe that is located in parallel to the ground-side straight pipe portion and the building-side straight pipe portion and is connected to each of the ground-side straight pipe portions and the building-side straight pipe portion via curved pipe portions, respectively. A flange-connecting joint is provided on at least one of the ground-side straight pipe part and the building-side straight pipe part. An EF joint is used for a connecting portion between the side straight pipe portion or the building side straight pipe portion and the flange connecting joint. Therefore the connection part connected has characterized the seismic isolation joint being clamped by the clamp member mounted to the pedestal.

Further, according to a ninth aspect of the present invention, each of the bent pipe portions has a shape that is folded back by 180 ° by connecting two 90 ° bend pipes by butt fusion. The seismic isolation joint used for the seismic isolation joint structure according to claim 8 , which is provided at both ends and is electrically fused by using an EF joint at a connection portion divided by the central straight pipe portion. Yes.

Further, according to a tenth aspect of the present invention, the bent pipe part is butt-fused to both ends of the central straight pipe part using a pair of U-shaped pipes, and is divided by the central straight pipe part. In the connected portion, an EF joint is used, and the seismic isolation joint used for the base-isolated joint structure according to claim 8 is characterized by being electrically fused.

Then, those described in claim 11, and the ground-side joint divided by the central straight pipe portion, and a building-side joint at the central straight tube portion, the EF joints, as well as connecting, the EF joint The construction method of the seismic isolation joint structure according to any one of claims 1 to 7 , wherein the construction is suspended from the building side using a metal band member connected to a wire member .

  In the invention according to claim 1 configured as described above, the central straight pipe portion that connects the flexible resin pipes in a substantially S shape is provided on both the ground side straight pipe portion and the building side straight pipe portion. It is provided in parallel to.

  For this reason, for example, in a state where the seismic isolation joint is connected to the ground side pipe and the building side pipe laid in the horizontal direction, the central straight pipe portion is extended in the horizontal direction, for example, The space in the height direction of the underfloor space formed between the ground and the building is not required.

  Further, since the displacement in the horizontal direction is mainly applied to the curved pipe portion, a sufficient amount of displacement absorption can be secured without increasing the longitudinal dimension of the central straight pipe portion.

Furthermore, since the seismic isolation joint can be configured with only a flexible resin material, the cost is low and an increase in construction cost is also suppressed.
In addition, since the ground side straight pipe part and the flange connection joint provided at the end of the building side straight pipe part can be connected to the ground side pipe or the building side pipe constituted by metal pipes, Maintenance and versatility are improved.
And the connection part of the ground side straight pipe part or building side straight pipe part, and the joint for a flange connection connected by the EF joint is clamped by the metal clamp member from the up-down direction.
For this reason, both ends of the seismic isolation joint are securely fixed to the ground side or the building side by the pedestal main body to which the metal clamp member is mounted, and are edged against the displacement.
Therefore, even if an earthquake occurs, the displacement on the ground side is not transmitted to the building side via the seismic isolation joint.

  In the second aspect of the present invention, the curved pipe portion is configured by connecting two 90 ° bend pipes. For this reason, since it can form with the existing cheap 90 degree bend pipe | tube with comparatively easy secondary shaping | molding process, the increase in the manufacturing cost of a seismic isolation joint is further suppressed.

  Furthermore, since the curved pipe part is formed by using a U-shaped pipe, the invention described in claim 3 improves the curvature radius of the curved pipe part or the degree of freedom of the curved shape, and Construction efficiency in a narrow underfloor space can be improved.

  Moreover, since the said curved pipe part is connected by the butt fusion | fusion, what was described in Claim 4 can perform a connection operation | work beforehand in the factory etc.

  And since the bead formation width by butt fusion | bonding is narrow, there is no possibility of impairing the flexibility of the said seismic isolation joint.

  Further, according to a fifth aspect of the present invention, the central straight pipe portions having a relatively small amount of distortion deformation are connected by an EF joint. For this reason, there is no possibility of impairing the flexibility of the whole seismic isolation joint.

Furthermore, the one described in claim 6, the metallic band member connected to the wire member, the connection portion provided in the central straight tube portion, is suspended from the building side.

  For this reason, the versatility of the construction space is further improved, and the displacement on the ground side is not transmitted to the building side.

According to a seventh aspect of the present invention, the metal band member that causes the connection portion to be suspended is pulled upward by the weight member suspended from the tip of the wire member via the suspension means. Given the force, the self-weight of the seismic isolation joint is supported.

  And, even if the position of the seismic isolation joint is displaced due to the shaking due to the earthquake, the weight member suspended via the hanging means moves up and down to absorb the displacement, and when the shaking stops, Balance back to the original position.

Further, in the eighth aspect of the present invention, the central straight pipe portion that connects the flexible resin pipes in a substantially S shape has both the ground side straight pipe portion and the building side straight pipe portion. By providing in parallel, for example, in the state where the seismic isolation joint is connected to the ground side pipe and the building side pipe laid in the horizontal direction, the central straight pipe portion is extended in the horizontal direction. Therefore, the space in the height direction of the underfloor space formed between the ground and the building is not required.

  Further, since the displacement in the horizontal direction is mainly applied to the curved pipe portion, a sufficient amount of displacement absorption can be secured without increasing the longitudinal dimension of the central straight pipe portion.

Furthermore, since the seismic isolation joint can be configured with only a flexible resin material, the cost is low and an increase in construction cost is also suppressed.
In addition, since the ground side straight pipe part and the flange connection joint provided at the end of the building side straight pipe part can be connected to the ground side pipe or the building side pipe constituted by metal pipes, Maintenance and versatility are improved.
And the connection part of the ground side straight pipe part or building side straight pipe part, and the joint for a flange connection connected by the EF joint is clamped by the metal clamp member from the up-down direction.
For this reason, both ends of the seismic isolation joint are securely fixed to the ground side or the building side by the pedestal main body to which the metal clamp member is mounted, and are edged against the displacement.
Therefore, even if an earthquake occurs, the displacement on the ground side is not transmitted to the building side via the seismic isolation joint.

Further, according to a ninth aspect of the present invention, each of the bent pipe portions has a shape that turns back 180 ° by connecting two 90 ° bend pipes by butt fusion.

  Moreover, the said center straight pipe part which connects this curved pipe part can be divided | segmented, and the two members in the divided | segmented state can be formed in a substantially identical shape, and manufacturing efficiency is favorable.

  And it can connect easily in a substantially S shape by carrying out the electric fusion of this connection part using the said EF joint at a construction site.

  For this reason, even if the said curved pipe part is previously provided in the both ends of the said center straight pipe part, two members divided | segmented by this center straight pipe part can perform conveyance easily without becoming bulky at the time of conveyance. I can do it.

Further, according to a tenth aspect of the present invention, the bent tube portion is formed of a U-shaped tube and is connected to the central straight tube portion by butt fusion.

  Moreover, the said center straight pipe part which connects this curved pipe part can be divided | segmented, and the two members in the divided | segmented state can be formed in a substantially identical shape, and manufacturing efficiency is favorable.

  In addition, it is possible to connect the connection portion in an approximately S shape more easily by electro-welding the connection portion using the EF joint at the construction site.

  For this reason, even if the U-shaped tube having a shape folded in advance by 180 ° is provided at both ends of the central straight pipe portion, the two members divided by the central straight pipe portion are transported without being bulky at the time of transport. Can be easily performed.

According to the eleventh aspect of the present invention, the ground side joint divided by the central straight pipe portion and the building side joint are connected by an EF joint at the central straight pipe portion.

For this reason, after disassembling and transporting to the construction site, the central straight pipe part is connected at the construction site using the EF joint, so that it is not bulky at the time of transportation, and in a limited space. It can be constructed and the workability is good.
Further, the EF joint is suspended from the building side using a metal band member connected to the wire member.
For this reason, the versatility of the construction space is further improved, and the displacement on the ground side is not transmitted to the building side.

  Next, a seismic isolation joint structure, a seismic isolation joint, and a construction method of the seismic isolation joint structure according to the best mode for carrying out the invention will be described with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals.

  First, the structure of the seismic isolation joint structure according to this embodiment will be described. In this embodiment, as shown in FIGS. 1 and 2, the building bottom surface portion 1 a on the building 1 side and the building 1 are placed. The base isolation joint structure which has the base isolation joint 10 used for the building structure in which the base isolation apparatus 7 ... is provided between the ground 2 side is illustrated.

  In this seismic isolation joint structure, the seismic isolation joint 10 includes a flange portion 5a of the ground side pipe 5 extended from the ground 2 side, and a flange portion 4a of the building side pipe 4 extended from the building 1 side. And are connected to each other.

  The seismic isolation joint 10 of this embodiment is mainly composed of a high-density polyethylene pipe as a flexible resin material, and a metal flange portion 11a is provided on the flange portion 5a of the ground side pipe 5. The ground-side straight pipe portion 11 connected and extended via the building, and the building-side straight pipe connected to the flange portion 4a of the building-side pipe 4 via the metal flange portion 12a and extended. Part 12.

  The ground-side straight pipe portion 11 and the building-side straight pipe portion 12 extend substantially in parallel with each other, and are provided with a predetermined dimension H in the vertical direction.

  Further, as shown in FIGS. 5 and 6, the seismic isolation joint 10 is positioned parallel to the ground side straight pipe portion 11 and the building side straight pipe portion 12, and the ground side straight pipe portion 11. And the central straight pipe part 15 connected to the building side straight pipe part 12 via the curved pipe parts 13 and 14, respectively, is provided so as to be substantially S-shaped in a side view. .

  The curved pipe parts 13 and 14 of the seismic isolation joint 10 of this embodiment connect two 90 ° bend pipes 13a and 13a and 14a and 14a having the same shape by butt fusion parts 13b and 14b, respectively. Therefore, it is configured to exhibit a shape that turns back 180 °.

  Further, the end of the 90 ° bend pipe 13a on the building side of this embodiment is integrally connected to the building side straight pipe portion 12 and the butt fusion 13c, and the end of the 90 ° bend pipe 14a on the ground side. The end portion is also integrally connected by the ground side straight pipe portion 11 and the butt fusion 14c.

  Further, the central straight pipe portion 15 of this embodiment is constituted by horizontal straight pipe portions 13d and 14d of the 90 ° bend pipes 13a and 14a, and these horizontal straight pipe portions 13d and 14d are brought together. The end portions are fusion-bonded and connected by an EF joint 16 (electric fusion joint).

  As shown in FIG. 3, the connection portion by the EF joint 16 provided in the central straight pipe portion 15 is formed by metal band members 17, 18 having a substantially hat shape in a side view around the EF joint 16 from the vertical direction. The left and right flange portions 17a, 17a and 18a, 18a are fastened by the bolt members 19, 19 and the nut members 20, 20 together.

  Eyebolt members 21 and 21 are respectively screwed to the left and right starboard portions 17a and 17a and 18a and 18a, and are paired obliquely from the housing bottom surface portion 1a on the building 1 side. These eyebolt members 21 and 21 are suspended by the wire members 22 and 22.

  The wire members 22 and 22 are mainly turnbuckle members 23 and 23 for length adjustment, and metal spring members 24 that are provided before and after the turnbuckle members 23 and 23 to absorb vibrations. 24 mainly.

  Further, ring members 25 and 25 are provided at the upper ends of the left and right wire members 22 and 22, respectively, and the central straight pipe portion 15 is arranged in the longitudinal direction on the bottom surface portion 1a of the building 1. The guide bar members 26 and 26 suspended in alignment with the ring members 25 and 25 are inserted into the center hole portions 25a and 25a of the ring members 25 and 25 so as to be slidable.

  Furthermore, in this embodiment, as shown in FIG. 2, of the ground side straight pipe part 11 and the building side straight pipe part 12, the metal flange parts 11a and 12a as the flange connection joints are connected. In the vicinity of the end faces 11b and 12b, EF joints 27 and 28 for connecting the ground side straight pipe portion 11 and the building side straight pipe portion 12 and the flange connecting joints 11a and 12a, respectively, are used.

  And before and after these EF joints 27 and 28, the ground side pedestal member 32 and the metal clamp members 29a and 29b of the building side pedestal member 31 are respectively the ground side straight pipe part 11 and the building side straight pipe part. 12 is provided to fix the vicinity of the edge.

  The metal clamp members 29a and 29b are penetrated by the ground side pedestal member 32 and the pedestal main body 32a of the building side pedestal member 31 and bolt members 29c and 29c erected from 31a.

  Then, nut members 29d and 29d are screwed onto the bolt members 29c and 29c, so that the vicinity of the ends of the ground side straight pipe portion 11 and the building side straight pipe portion 12 is sandwiched from above and below, It is comprised so that it may each be fixed to the said ground 2 and the frame bottom face part 1a of the said building 1. FIG.

  In this embodiment, as shown in FIG. 1, the seismic isolation is more effective than the metal flange portions 11a and 12a which are the connection portions between the flange portion 4a of the building side pipe 4 and the flange portion 5a of the ground side pipe 5. On the joint 10 side, both ends of the seismic isolation joint 10 are fixed from above and below by the metal clamp members 29a and 29b.

  Next, the effect of the seismic isolation joint structure of this embodiment, a seismic isolation joint, and the construction method of this seismic isolation joint structure is demonstrated.

  In this embodiment, as shown in FIG. 6, first, in the factory, the bent pipe portions 13, 14 connect the two 90 ° bend pipes 13 a, 13 a and 14 a, 14 a to the butt welds 13 b, 14 b. In this case, the building side straight pipe part 12 and the ground side straight pipe part 11 are connected so as to be integrated with the butt welds 13c and 14c. To do.

  And the metal flange parts 12a and 11a as a flange connection joint are connected to the edge part of the said building side straight pipe part 12 and the ground side straight pipe part 11 by EF joints 27 and 28.

  In this embodiment, since the two members divided between the horizontal straight pipe portions 13d and 14d have substantially the same shape, the manufacturing efficiency is good.

  In this state, transport is performed to the construction site, and as shown in FIGS. 1 and 2, the seismic isolation joint is installed in the underfloor space between the building bottom 1 a on the building 1 side and the ground 2 side. 5, when the EF joint 16 is used as shown in FIG. 5, the horizontal straight pipe portion 13d and the horizontal straight pipe portion 14d are joined by electrofusion, The side straight view S provided with the central straight pipe portion 15 composed of the horizontal straight pipe portion 13d and the horizontal straight pipe portion 14d so as to be parallel to the building side straight pipe portion 12 and the ground side straight pipe portion 11 is provided. They are connected to form a letter shape.

  For this reason, after disassembling into three members including the EF joint 16 and transporting it to the construction site, the central straight pipe portion 15 is connected at the construction site using the EF joint 16 so as to be bulky at the time of transportation. In addition, it can be installed in a limited space such as an under-floor space and can be constructed, and transportability and construction workability are good.

  In the seismic isolation joint 10 of this embodiment, as shown in FIG. 1, the central straight pipe portion 15 to which the flexible resin pipe is connected in a substantially S shape is the ground side straight pipe portion 11 and the above-described straight pipe portion 11. It is provided in parallel to both of the building-side straight pipe sections 12.

For this reason, for example, in the state where the seismic isolation joint 10 is connected to the ground side pipe 5 and the building side pipe 4 laid in the horizontal direction, the central straight pipe portion 15 extends in the horizontal direction. Thus, an increase in the height direction dimension H is suppressed.

  For example, the space in the height direction of the underfloor space formed between the ground 2 and the building 1 has a conventional vertical straight pipe portion 3c shown in FIG. It is not necessary.

  Furthermore, as shown in FIG. 2, the dimension L between the metal clamp members 29 a and 29 b of the ground side pedestal member 32 and the metal clamp members 29 a and 29 b of the building side pedestal member 31 is limited to that of the building 1. It can be set so that it can be stored in the space under the floor.

  Further, the displacement in the horizontal direction is mainly applied to the portion for fixing the seismic isolation joint 10 and the bent pipe portions 13 and 14.

  As shown in FIG. 7, when the end portion of the building-side straight pipe portion 12 is fixed and the end portion of the ground-side straight pipe portion 11 is horizontally moved in the direction of the arrow −X, The largest stress acts on a part a on the upper surface side in the vicinity of the end part, an upper surface of the 90 ° bend pipe 13a of the curved pipe part 13 and a part b of the inclined surface part, and distortion occurs.

  At this time, even if the displacement of the end portion of the ground side straight pipe portion 11 is about 600 mm, the high-density polylene resin material (Young's modulus 100 (kg / square millimeter), Poisson's ratio 0.4, allowable stress 2) .4 (kgf / square millimeter. (Yield stress 2.4 kgf / millimeter, set with safety factor 1.0)) can be achieved within 3.0% given as an allowable strain.

  Here, the dimension in the depth direction from the end of the ground side straight pipe part 11 to the end of the building side straight pipe part 12 is 1.133 m, the height direction dimension H = 2 m, and the diameter of each pipe part is The case where the thickness is about 147 mm and the wall thickness is about 6 mm is shown.

  As shown in FIG. 8, when the end of the building-side straight pipe portion 12 is fixed and the end of the ground-side straight pipe portion 11 is horizontally moved in the arrow Y direction, the building-side straight pipe portion 12 is moved. The largest stress acts on a part c on the side surface in the vicinity of the end part and a part d on the inner inclined surface part of the 90 ° bend pipe 14a of the bent pipe part 14 to generate distortion.

  From this result, a large stress does not act on the central straight pipe portion 15 extending horizontally, and the stress is dispersed by the bent pipe portions 13 and 14 positioned above and below to reduce distortion. I understand that.

  Accordingly, the displacement absorption amount can be increased without increasing the longitudinal dimension and the height dimension H of the central straight pipe portion 15, and the building having the seismic isolation structure in which the construction space in the underfloor space is limited. Even when applied to 1, sufficient displacement absorption can be secured.

  Furthermore, in this embodiment, since the seismic isolation joint 10 can be substantially configured only by the high-density polyethylene pipe that is a flexible resin material, the seismic isolation joint 10 is inexpensive and suppresses an increase in construction cost. Is done.

  In this embodiment, the two bent 90 ° bend pipes 13a, 13a and 14a, 14a are connected to form the bent pipe parts 13, 14.

  For this reason, since the said curved pipe parts 13 and 14 can be formed with the 90 degree bend pipes 13a, 13a, 14a, and 14a which are comparatively easy for a secondary shaping | molding process, the increase in the manufacturing cost of the seismic isolation joint 10 is further suppressed. Is done.

  In addition, since the 90 ° bend pipes 13a, 13a, 14a, 14a have a stable dimensional accuracy such as thickness, the desired displacement absorbing performance can be easily exhibited.

  Further, since the bent pipe portions 13 and 14 are connected by butt fusion, connection work can be performed in advance in a factory or the like.

  And since the bead formation width by the butt fusion | fusion 13b is narrow, there is no possibility that the flexibility of the said seismic isolation joint 10 may be impaired.

  Further, the central straight pipe portion 15 having a relatively small amount of distortion deformation is connected by an EF joint 16. For this reason, there is no possibility of impairing the flexibility of the seismic isolation joint 10 as a whole.

  Further, as shown in FIG. 1, the ground side pipe constituted by metal pipes by the flange side joints 11a and 12a provided at the ends of the ground side straight pipe part 11 and the building side straight pipe part 12. 5 can be connected to the flange portion 5a of the building 5 or the flange portion 4a of the building-side piping 4, so that versatility is improved.

  Then, the flange connection joint connecting portions connected by the EF joints 27 and 28 are clamped by the metal clamp members 29a, 29a and 29b, 29b in the vertical direction.

  For this reason, both ends of the seismic isolation joint 10 are securely fixed to the ground 2 side and the building bottom surface portion 1a on the building 1 side by the pedestal main bodies 31a and 32a to which the metal clamp members 29b and 29b are attached. , Edged against displacement.

  Therefore, the displacement on the ground 2 side is not transmitted to the building 1 side, and the seismic isolation devices 7 and 7 can exhibit desired seismic isolation performance.

  Further, the metal band members 17 and 18 connected to the wire members 22 and 22 suspend the connection portion by the EF joint 16 provided in the central straight pipe portion 15 from the building 1 side.

  In this embodiment, the ring members 25, 25 provided at the upper ends of the wire members 22, 22 are aligned with the central straight pipe portion 15 in the longitudinal direction on the bottom surface portion 1 a of the building 1. The guide bar members 26 and 26 are suspended so as to be slidable in the longitudinal direction.

  For this reason, the seismic isolation joint 10 is more stably suspended from the bottom surface 1a of the housing, and the ring members 25 and 25 are rotatable along the guide bar members 26 and 26. , Displacement in the Y direction is also allowed.

  For this reason, the versatility of the construction space is further improved, and the displacement on the ground side is not transmitted to the building side.

  And in this embodiment, the said curved pipe part 13 is each exhibiting the shape turned back 180 degrees by connecting two 90 degree bend pipes by butt melt | fusion.

  Moreover, by using the EF joint 16 at the construction site, the horizontal straight pipe portions 13d and 14d of the central straight pipe portion 15 are attached to each other and electrically connected to each other so as to be easily connected in a substantially S shape. Can do.

  For this reason, even if the said curved pipe parts 13 and 14 are previously provided in the both ends of the said center straight tube | pipe part 15, two members divided | segmented by the center straight tube | pipe part 15 carry out conveyance without being bulky at the time of conveyance. It can be done easily.

  FIG. 9 shows the seismic isolation joint structure of Example 1 of the embodiment of the present invention.

  Note that portions that are the same as or equivalent to those in the above-described embodiment are described with the same reference numerals.

  In the seismic isolation joint structure of Example 1, the seismic isolation joint 10 is horizontally disposed in an underfloor space in which a height direction space is limited.

  In the first embodiment, the EF joint 16 is suspended by the wire member 122.

  Next, the function and effect of the first embodiment will be described.

  In Example 1, in addition to the effects of the seismic isolation joint and the seismic isolation joint structure of the above embodiment, the EF joint 16 is further suspended by the wire member 122.

  For this reason, members, such as another support tool and a base, are unnecessary, and the increase in a number of parts can be suppressed.

  Other configurations and operational effects are the same as or equivalent to those of the above-described embodiment, and thus description thereof is omitted.

  FIG. 10 shows the seismic isolation joint structure of Example 2 of the embodiment of the present invention.

  In addition, the same code | symbol is attached | subjected and demonstrated about the same thru | or equivalent part as the said embodiment and Example 1. FIG.

  In the seismic isolation joint structure according to the second embodiment, the curved pipe portions 113 and 113 are formed of U-shaped pipes that are integrally formed in advance, and are connected to the central straight pipe portion 115 by butt fusion.

  Next, the function and effect of the second embodiment will be described.

  In Example 2, in addition to the functions and effects of the seismic isolation joint and the seismic isolation joint structure of the embodiment and Example 1, the U-shaped pipe is further used, and the curved pipe portions 113 and 113 are provided. Since it is formed, the curvature radius of the curved pipe portion 113 or the degree of freedom of the curved shape can be improved, and the construction efficiency in the narrow underfloor space can be improved.

  Further, as shown in FIG. 10, the central straight pipe portion 115 connecting the curved pipe portions 113 and 113 is divided into two horizontal straight pipe portions 115a and 115b, and the two members in the divided state are substantially the same. It can be formed into a shape, and the production efficiency is good.

  And it can connect to this connection part more easily in a substantially S shape using the said EF coupling 16 at a construction site.

  For this reason, even if the curved pipe portions 113 and 113 having a shape folded in advance by 180 ° are provided at both ends of the central straight pipe portion 115, the butted portions of the horizontal straight pipe portions 115a and 115b of the central straight pipe portion 115 The two members divided by can be easily transported without being bulky during transport.

  Other configurations and operational effects are the same as or equivalent to those of the above-described embodiment and Example 1, and thus description thereof is omitted.

  11 to 12 show the seismic isolation joint structure of Example 3 of the embodiment of the present invention.

  In addition, the same code | symbol is attached | subjected and demonstrated about the same thru | or equivalent part as the said embodiment and Example 1,2.

  First, from the difference in configuration, in the seismic isolation joint structure of the third embodiment, the configuration of the portion to be supported by hanging the seismic isolation joint 10 is different from that of the above embodiment.

  That is, in Example 3, instead of the wire member 22 using the turnbuckle member 23 and the spring member 24 of the above-described embodiment, one end 222a of the wire members 222, 222 that can be cut to an arbitrary length at the construction site. , 222a and wire clip members 43, 43... Are connected to the metal band members 17 and 18, and weight members 44 and 44 are connected to the other ends 222b and 222b, respectively. Yes.

  In addition, a pair of C-shaped steel materials 45 and 45 having a substantially U-shaped cross section are arranged in parallel on the bottom surface 1a of the building 1 at a predetermined interval.

  And these C-type steel materials 45 and 45 are provided with pulley members 46 and 46 as suspension means, respectively.

  The pulley members 46 and 46 are fixed to the C-shaped steel members 45 and 45 at the upper portions, respectively, and a substantially U-shaped bracket member 46b and 46b opened to the lower side. A pulley body 46a, 46a having a flat drum shape with a wire groove sandwiched between the two portions being recessed is pivotally attached to be mainly configured.

  The wire members 222, 222 are engaged with the pulley bodies 46 a, 46 a of the pulley member 46.

  Therefore, in a normal hanging state, the balance between the weight members 44, 44 and the seismic isolation joint 10 filled with water is maintained, and as shown in FIG. When viewed from the front, the seismic isolation joint 10 is sandwiched so that the angle of attack α1, α2 of each wire member 222, 222 from the horizontal line to the pulley members 46, 46 is about 60 degrees, respectively. The EF joint 16 is provided with a lifting force so as to exhibit a symmetrical type, and the weight of the seismic isolation joint 10 and the weight of internal water are supported. .

  These wire members 222 are configured so that the metal band members 17 and 18 connecting the EF joints 16 and 16 as the connection portions can move in the left-right direction as the seismic isolation joint 10 moves. 222, the pulley main bodies 46a, 46a are respectively rotated while the tension members are stretched, and the weight members 44, 44 suspended from the tips of the wire members 222, 222 are moved in the vertical direction. Has been.

  In the seismic isolation joint structure of the third embodiment, the weight main bodies 44a and 44a of the weight members 44 and 44 are formed so as to have a substantially cylindrical shape.

  Among these, a semi-annular suspension ring portion 44b through which the wire member 222 is inserted is integrally formed on the upper surface portion of the weight main body 44a.

  Further, a pair of semi-annular connection ring portions 44c and 44c are integrally formed on the lower surface portion of the weight main body 44a so as to connect and suspend another weight member 44.

  Guide cylinder members 47 and 47 are provided around the weight members 44 and 44 as guide members for guiding the movement of the weight members 44 and 44 in the vertical vertical direction.

  Inside these guide tube members 47, 47, guide space portions 47a, 47a are formed, which extend substantially over the entire length of the weight members 44, 44, and have a hollow cylindrical shape.

  Further, mounting band members 49, 49 are used for L-shaped bracket members 48, 48 in which the upper outer peripheral surface portions 47b, 47b of the respective guide tube members 47, 47 are fixed to the frame bottom surface portion 1a of the building 1. And fixed in a state where the longitudinal direction is along the vertical direction.

  Next, the effect of the seismic isolation joint structure of this Example 3 and the construction method of this seismic isolation joint structure is demonstrated.

  In Example 3, in addition to the operational effects of the embodiment and Examples 1 and 2, first, when the seismic isolation joint 10 is first constructed, as shown in FIG. 1 of the embodiment. The turnbuckle members 23 are not required, and the wire members 222 and 222 can be cut to an appropriate length at the construction site and can be adjusted.

  That is, the wire members 222 and 222 are engaged with the pulley bodies 46a and 46a of the pulley members 46 and 46, and one ends of these wire members 222 and 222 are fixed to the metal band members 17 and 18. The eyebolt members 21 and 21 are inserted and folded back to have a substantially annular shape, and are fixedly connected to appropriate positions of the wire members 222 and 222 by the wire clip members 43 and 43, respectively.

  Further, the other ends of these wire members 222, 222 are inserted into the holes of the respective suspension ring portions 44b, 44b formed integrally with the upper portions of the weight members 44, 44, turned back, and substantially annular. At the same time, the other ends of the wire members 222 and 222 are fixedly connected to the wire members 222 and 222 by the wire clip members 43 and 43, respectively.

  Then, the weight members 44, 44 are inserted into the guide space portions 47a, 47a of the guide tube members 47, 47 from the upper end openings of the guide tube members 47, 47, as shown in FIG. The left and right are substantially symmetrical in a frontal view and are substantially M-shaped.

  In a normal suspended state where there is no such earthquake and no vibration is applied, the weight members 44, 44 and the seismic isolation joint 10 filled with water are maintained in a balanced state. As shown in FIG. 12, the seismic isolation joint is set so that the angles of attack α1 and α2 of the wire members 222 and 222 from the horizontal line from the eyebolt 21 to the pulley members 46 and 46 are about 60 degrees, respectively. 10 is sandwiched, and a symmetric type having a substantially M-shape in front view is exhibited.

  For this reason, substantially the same force is given to the metal band members 17 and 18 from the wire members 222 and 222 to the EF joint 16 portion in the up, down, left and right directions, and acts as a lifting force. The weight of the seismic coupling 10 and the weight of the water in the interior are supported.

  Even if the position of the seismic isolation joint 10 is displaced up and down and left and right due to shaking caused by an earthquake, the weight members 44 and 44 suspended through the pulley members 46 and 46 move in the up and down direction. The displacement is absorbed without applying extra stress to the seismic isolation joint 10.

  Further, when the shaking due to the earthquake is settled, the angle of attack α1, α2 of each of the wire members 222, 222 from the horizontal line from the eyebolt 21 to the pulley members 46, 46 is set so as to return to the original position. With the seismic isolation joint 10 interposed therebetween, the balance is returned to the balance position so as to exhibit a substantially M-shaped symmetric shape when viewed from the front so as to be about 60 degrees.

  In the seismic isolation joint structure described in the third embodiment, a turnbuckle is not required at the time of construction, and processing of both ends of the wire member 222 is not necessary. Therefore, the length of the wire member 222 is adjusted at the construction site. Is easy.

  For this reason, if the wire members 222, 222 are cut at the construction site, and the lengths are adjusted using the wire clip members 43, 43, the vertical dimension of the underfloor space of any building 1 or the like is different. It can correspond to.

  Moreover, since the movement of the seismic isolation joint 10 in the left-right direction can be absorbed by the movement of the weight member 44 in the up-down direction, the maximum distance in the vertical direction of the space from the surface of the ground 2 to the bottom surface portion 1a of the frame is approximately the maximum. Equivalent stroke can be secured.

  For this reason, compared to the wire member 22 using the spring members 24, 24 of the above-described embodiment, it is possible to set a large stroke, and it is composed of a flexible resin tube connected in a substantially S shape with a large movable range. The seismic isolation joint 10 is suitable for use.

  Moreover, in the third embodiment, the guide space 47a formed inside the guide cylinder member 47 is formed so as to be able to be inserted through the weight member 44 over substantially the entire length in the vertical direction.

  For this reason, since the weight member 44 can be extracted from the lower end of the guide tube member 47, a larger stroke can be secured and the weight member 44 should be provided on the surface of the ground 2 by any chance. Even if it abuts, the wire member 222 bends in the contraction direction, and further movement of the seismic isolation joint 10 can be absorbed.

  In the third embodiment, when the weight members 44, 44 suspended from the tip of the wire member 222 move in the vertical direction, they pass through the guide space portion 47a inside the guide tube member 47, and the inner peripheral surface. Is guided so as not to swing horizontally and horizontally.

  The guide cylinder member 47 of the third embodiment is fixed to the frame bottom surface portion 1 a of the building 1 by the L-shaped bracket member 48.

  Accordingly, the guide cylinder member 47 itself is also less likely to shake as compared with the case where the guide cylinder member 47 is fixed to the ground side 2.

  Moreover, in this Example 3, since the wire member 222 is not connected to the ground side at all, the influence by the vibration of the earthquake does not increase and acts in a direction to suppress the movement of the seismic isolation joint 10. .

  For this reason, as shown in FIG. 12, the angle of attack α1 and α2 of the wire members 222 and 222 from the horizontal line from the eyebolt 21 to the pulley members 46 and 46 are set to be about 60 degrees, respectively. Then, the distance between the seismic isolation joint 10 and the guide cylinder member 47 that guides the weight member 44 and the wire member 222 is set to be equal to or larger than a certain dimension.

  That is, by setting the angles of attack α1 and α2 to be about 60 degrees each, as shown in FIG. 11, from the building-side straight pipe portion 12 of the seismic isolation joint 10 to the lower ground side. Even if the set dimension H in the vertical direction of the straight pipe portion 11 and the like is large and the amount of movement in the horizontal direction due to the earthquake vibration increases, the seismic isolation joint 10 and the guide tube members 47 and 47 are , The risk of interference is reduced.

  Further, since the angles of attack α1 and α2 are set to be about 60 degrees, respectively, the upward pulling force required for supporting the connecting portion by the EF joint 16 is sufficiently used as a component force. In addition to being able to ensure, in this Example 3, since it is connected and wired so as to exhibit a substantially M-shaped symmetric shape in front view, the pulling force in the left and right horizontal directions is also the same on the left and right be able to.

  Therefore, when the earthquake is settled and the seismic isolation device 10 returns to the normal position between the ground 2 and the building 1 by the action of the seismic isolation devices 7, 7, these left and right weights are provided. As shown in FIG. 12, the vertical positions of the members 44 and 44 are also returned to substantially the same vertical position, and returned so as to exhibit a substantially M-shaped symmetrical type when viewed from the front. Supported.

  Other configurations and operational effects are the same as or equivalent to those of the above-described embodiment and Examples 1 and 2. Therefore, the description thereof is omitted.

  13 to 14 show the seismic isolation joint structure of Example 4 according to the embodiment of the present invention.

  In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as the said embodiment and Examples 1-3.

  In the seismic isolation joint structure of the fourth embodiment, the seismic isolation joint 10 is placed horizontally in the underfloor space in which the space in the height direction is limited, as in the seismic isolation joint structure of the first embodiment, and is connected in series. A configuration is shown in which the weight members 44, 44 are suspended and supported by a single connected wire member 322.

  First, to explain the difference in configuration, in the fourth embodiment, the metal band member 117 fitted around the EF joint 16 is formed to have an opening in the pair of left and right mating flange portions 117a and 117a. The wire holes 117b and 117b are aligned with each other, and one end 322a of the wire member 322 is inserted into the wire holes 117b and 117b, is folded back, and is connected in a substantially annular shape, and is connected by the wire clip member 43. The other end 322b is fixed and connected to an appropriate position of the wire member 322.

  Further, an eyebolt member 21 is protruded from the lower surface side of the C-type steel material 45 positioned substantially directly above the EF joint 16 as the connecting portion and directed downward.

  The wire member 322 is inserted into the insertion hole 21a formed in the eyebolt member 21, and the pulley member is attached to the C-type steel material 45 and the C-type steel material 145 spaced apart by a predetermined dimension W2. 46 is engaged with a pulley body 46a.

As shown in FIG. 14, the predetermined dimension W2 is set to be larger than the dimension W1 between the EF joint 16 of the seismic isolation joint 10 and the straight pipe portion 111 (W2> W1). Thus, even when the seismic isolation joint 10 moves up, down, left and right, it is set so as not to interfere with the guide cylinder member 47 that guides the weight members 44, 44.

  Next, the effect of this Example 4 is demonstrated.

  In Example 4, in addition to the operational effects of the above-described embodiment and Examples 1 to 3, the weight members 44, 44 and 44 in the normal hanging state where there is no earthquake and no vibration is applied. The balance with the base isolation joint 10 filled with water is maintained, and the base isolation joint 10 is supported as shown in FIGS. 13 and 14.

  Even if the position of the seismic isolation joint 10 is displaced from side to side due to shaking caused by an earthquake, the weight members 44 and 44 suspended via the eyebolt 21 and the pulley member 46 are used as the guide tube member 47. The displacement is absorbed without moving excessively in the seismic isolation joint 10 by moving in the vertical direction.

  When the shaking due to the earthquake is stopped, the seismic isolation joint 10 returns to a position where it balances with the weight members 44, 44 as shown in FIG.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the above-described embodiment, the EF joint 16 is used and the horizontal straight pipe portion 13d and the horizontal straight pipe portion 14d are joined by electrofusion, but the present invention is not limited thereto. For example, it may be joined by butt fusion, and the central straight pipe portion 15 composed of the horizontal straight pipe portion 13d and the horizontal straight pipe portion 14d is connected to the building side straight pipe portion 12 and the ground side straight pipe. As long as it is connected so as to exhibit a substantially S-shape in a side view provided so as to be parallel to the part 11, any part may be joined by butt fusion, and the shape, quantity, combination, and The connection method is not particularly limited.

  Moreover, in the said embodiment, although the seismic isolation joint 10 is mainly comprised using the high density polyethylene (HDPE) pipe | tube as a flexible resin material, it is not restricted to this in particular, For example, medium density Polyethylene (MDPE) or polybutene (PB) and combinations thereof may be used, and the shape, quantity, size and material of the tube are not particularly limited.

  Furthermore, in this embodiment, the wire member 22 using the turnbuckle member 23 and the spring member 24 has been shown and described. However, the present invention is not limited to this, and is described in the third and fourth embodiments. The weight member 44 may be configured in any combination, for example, in combination with at least one of the turnbuckle member 23 or the spring member 24, and the eyebolt member 21 as the suspension means and the The quantity, arrangement, combination and shape with the pulley member 46 may be configured in any manner.

It is a perspective view explaining the whole structure which carried out the vertical piping of the seismic isolation joint by the seismic isolation joint structure of the best embodiment of this invention. It is a seismic isolation joint structure of embodiment, and is a side view of the underfloor space of the building explaining the whole composition. FIG. 3 is a cross-sectional view at a position along the line AA in FIG. 2 in the seismic isolation joint structure of the embodiment. It is a seismic isolation joint structure of embodiment, and is a typical expansion perspective view of the B section in Drawing 3. It is a perspective view of a seismic isolation joint by the seismic isolation joint structure of embodiment. It is an exploded perspective view of a seismic isolation joint in the seismic isolation joint structure of an embodiment. In the seismic isolation joint structure of embodiment, it is a perspective view explaining the mode of distortion when the displacement of the arrow -X direction is given to the seismic isolation joint. It is a perspective view explaining the mode of distortion when the displacement of the arrow Y direction is given to the seismic isolation joint in the seismic isolation joint structure of an embodiment. It is a perspective view explaining the whole structure at the time of arranging a base isolation joint horizontally in the base isolation joint structure of Example 1 of an embodiment. It is a perspective view explaining the structure of the seismic isolation joint which used the U-shaped pipe for the curved pipe part by the seismic isolation joint of Example 2 of an embodiment. It is a perspective view explaining the whole structure which carried out vertical piping of the seismic isolation joint by the seismic isolation joint of Example 3 of embodiment. It is a longitudinal cross-sectional view explaining the structure in the position along the EE line in FIG. 11 which longitudinally piped the seismic isolation joint by the seismic isolation joint of Example 3 of an embodiment. It is a typical perspective view explaining the whole structure which carried out horizontal piping of the seismic isolation joint by the seismic isolation joint of Example 4 of an embodiment. FIG. 15 is a schematic cross-sectional view illustrating a configuration at a position along line FF in FIG. 13 in which the seismic isolation joint is horizontally piped in the seismic isolation joint of Example 4 of the embodiment. It is a side view which shows the structure using the seismic isolation joint which has a vertical straight pipe part by the seismic isolation joint structure of one prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building 2 Ground 4 Building side piping 5 Ground side piping 10,110 Seismic isolation joint 11 Ground side straight pipe part 11a, 12a Metal flange part (joint for flange connection)
12 building side straight pipe part 13, 13 curved pipe part 13a, 14a 90 ° bend pipe 13b, 13c, 14b, 14c butt fused part 15, 115 central straight pipe part 113, 113 curved pipe part (U-shaped pipe)
21 Eyebolt (suspending means)
29a, 29b Metal clamp member 31a, 32a Base body 31, 131 Building side base member 32 Ground side base member 44, 44 Weight member 46 Pulley member (hanging means)
47 Guide tube member (guide member)
111 Straight pipe section

Claims (11)

Used in a building structure in which a seismic isolation device is provided between the building side and the ground side on which the building is placed, the ground side piping extending from the ground side, and extending from the building side A seismic isolation joint structure having a seismic isolation joint for connecting to the building side piping,
The seismic isolation joint is composed of a flexible resin pipe, and is connected to the ground side pipe and extended to the ground side straight pipe part,
The building-side straight pipe portion connected to the building-side piping, and the ground-side straight pipe portion and the building-side straight pipe portion are located in parallel with each other, The building-side straight pipe portion has a central straight pipe portion connected via a curved pipe portion, and is connected in a substantially S shape .
At least one of the ground side straight pipe part and the building side straight pipe part is provided with a flange connection joint,
An EF joint is used as a connection part between the ground side straight pipe part or the building side straight pipe part and the flange connection joint, and a clamp member that holds the connection part connected by the EF joint. And a base for mounting the clamp member .   The seismic isolation joint structure according to claim 1, wherein the curved pipe portion is configured by connecting two 90 ° bend pipes.   The seismic isolation joint structure according to claim 1, wherein the curved pipe portion is configured by using a U-shaped pipe.   The seismic isolation joint structure according to any one of claims 1 to 3, wherein the curved pipe portions are connected by butt fusion.   The seismic isolation joint structure according to any one of claims 1 to 4, wherein the central straight pipe portion is connected by an EF joint. The connection part provided in the said center straight pipe part is suspended from the said building side using the metal band member connected with a wire member, The any one of Claims 1 thru | or 5 characterized by the above-mentioned. Seismic isolation structure. The wire member is supported by suspension means provided on the building side and engaged so as to be movable in the longitudinal direction of the wire member, and a weight member is suspended from the tip of the wire member. The base-isolated joint structure according to claim 6 . A seismic isolation joint for connecting a ground side pipe extending from the ground side and a building side pipe extending from the building side, the seismic isolation joint being constituted by a flexible resin pipe, A ground-side straight pipe portion connected to the ground-side pipe and extended, a building-side straight pipe portion connected to the building-side pipe, and the ground-side straight pipe portion and the building-side straight pipe It is located in parallel to the part, and has a central straight pipe part connected to the local board side straight pipe part and the building side straight pipe part via a curved pipe part, and is connected in a substantially S-shape. It is,
At least one of the ground side straight pipe part and the building side straight pipe part is provided with a flange connection joint,
An EF joint is used for the connection part of the ground side straight pipe part or the building side straight pipe part and the flange connection joint, and the connection part connected by the EF joint is mounted on the base. seismic isolation joints, characterized in Rukoto sandwiched by a clamp member which is. The bent pipe portion is formed by connecting two 90 ° bend pipes by butt fusion so as to be folded back by 180 °, and is provided at both ends of the central straight pipe portion. The seismic isolation joint used in the base isolation joint structure according to claim 8 , wherein an EF joint is used in the connection portion divided by 1 and is electrically fused. The curved pipe part is butt-fused to both ends of the central straight pipe part using a pair of U-shaped pipes, and an EF joint is used at the connection part divided by the central straight pipe part. The base-isolated joint used for the base-isolated joint structure according to claim 8 , wherein the base-isolated joint is electrically fused. The ground side joint divided by the central straight pipe part and the building side joint are connected by an EF joint at the central straight pipe part, and the EF joint is connected to a wire member using a metal band member. The construction method of the seismic isolation joint structure according to any one of claims 1 to 7 , wherein the construction method is suspended from the building side .

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