JP6034322B2 - Seismic isolation structure and construction method - Google Patents

Description

  The present invention relates to a base isolation structure having a base isolation part provided with a base isolation mechanism and a construction method thereof.

  Patent Document 1 discloses a seismic isolation structure formed by superposing a lower base packing fixed to a foundation and an upper base packing fixed to a base. According to this seismic isolation foundation structure, when an earthquake occurs, both foundation packings slide on the contact surface, and the earthquake energy is consumed. Thereby, the vibration transmitted to the wooden building can be reduced. In addition, the anchor bolts embedded in the foundation and the shock absorbers installed in the building are connected via a connecting member, so that the movement of the upper foundation packing is suppressed and horizontal shaking is converted to the vertical direction. Can be absorbed.

JP 2011-117280 A

  In the conventional base-isolated base structure, a gap is formed around the base-isolated structure portion arranged at regular intervals, and rainwater or the like may enter through this gap. However, the position of the lower and upper part of the seismic isolation structure is displaced when an earthquake occurs, and the displaced position may remain. Can not cope properly. In addition, even when a parting that is not specifically intended to function as the drainer is provided, in the parting of the fixed structure, the appearance is deteriorated due to distortion or the like caused by the position displacement or residual displacement. .

  In view of the above circumstances, the present invention does not reduce the appearance of the parting appearance even with respect to the positional displacement and residual displacement at the time of the earthquake occurrence of the upper divided part and the lower divided part of the basic component of the building, It is an object of the present invention to provide a base-isolated base structure that can maintain the function as a drainer and a construction method thereof even when a drainer is provided as a parting.

  In order to solve the above-described problem, the base isolation structure of the present invention is such that the foundation component of the building is divided into an upper divided portion and a lower divided portion by a horizontal plane, and between the upper divided portion and the lower divided portion. A seismic isolation mechanism is interposed, and the upper part is provided with a parting upper part, while the lower part is provided with a parting lower part. The facing state with respect to the side component is maintained even with respect to the position displacement.

  With the above configuration, even if the upper divided portion and the lower divided portion of the building's basic component portion are displaced due to the occurrence of an earthquake, the parting upper component portion can move relative to the lower component portion. In addition, the appearance of the parting appearance will not deteriorate even if the position of the upper and lower part of the building's foundation division and the remaining part of the lower part of the building are affected by the occurrence of an earthquake. The function as can be maintained. Moreover, since the gap generated in the foundation component by the presence of the seismic isolation mechanism is narrowed by the upper component and the lower component of the parting, it is possible to suppress the intrusion of rainwater from the gap. it can.

  A closing member that closes the gap between the upper component part and the lower component part of the parting may be provided, and the gap closed state may be maintained even with respect to the position displacement. According to this, it is possible to prevent rainwater and small animals from entering from the gap between the upper component and the lower component.

  The said closure member may consist of a 1st closure member and the 2nd closure member arrange | positioned indoors rather than the said 1st closure member. According to this, the invasion prevention performance of rainwater etc. can be improved.

  The first closing member may be a flexible member having a fin portion, and the second closing member may be a foam sealing member.

  The second closing member may be provided at a joint portion of the first closing member. According to this, compared with the structure which arrange | positions the said 2nd closing member in the whole arrangement | positioning area | region of the said 1st closing member, cost reduction and work improvement can be aimed at.

  The foundation component may include a ground-side wide part and a building-side narrow part, and the ground-side wide part may be divided into an upper part and a lower part.

  In the configuration divided at the ground-side wide portion, the upper part of the parting part may be attached to the lower surface of the upper part. According to this, since it is possible to set a reference position for displacement on the lower surface of the upper dividing portion, compared with the case where the upper configuration portion is provided on the outer surface of the upper dividing portion and the reference position is set, The protrusion of the upper constituent part can be reduced.

  In the configuration divided at the ground-side wide portion, a part or all of the base portion of the parting upper component portion may be embedded in the lower surface of the upper divided portion. According to this, compared with the case where a part or all of the base portion of the upper constituent part is attached to the lower surface of the upper dividing part by retrofitting, the workability and the strength of the attachment can be significantly increased.

  The lower part of the parting part may be attached to the upper surface of the lower parting part. According to this, compared with the case where the said lower side structure part is provided in the outer surface of the said lower parting part, the protrusion of the said upper side structure part can be made small.

  Moreover, the construction method of the seismic isolation foundation structure according to the present invention includes the step of forming the lower divided portion of the ground-side wide portion in the foundation constituent portion of the building including the ground-side wide portion and the building-side narrow portion; A step of arranging a plurality of seismic isolation mechanisms on the upper surface of the dividing part and arranging a removable space arranging member between the seismic isolation mechanisms, and arranging a base part of the upper component part of the parting on the space arranging member A step of forming an upper part of the ground side wide portion and the narrow side of the building on the space arrangement member, the base portion, and the seismic isolation mechanism, and a step of removing the space arrangement member. And a step of assembling the upper part and the lower part of the parting.

  If it is said structure, in the structure divided | segmented by the said ground side wide part, the structure by which a part or all of the base part of the said upper part part of said parting is embed | buried under the lower surface of the said upper part is said basic | foundation structure. It becomes possible to form at the construction stage of the part.

  In the construction method of the seismic isolation foundation structure, the base part of the lower component part is disposed on the upper surface of the lower part, and the upper part and the upper part are disposed in a state in which an enclosure member that temporarily surrounds the base part is disposed. You may make it form a building side narrow part and remove the said enclosure member after this formation. According to this, it becomes possible to form a structure in which the lower constituent part of the parting part is attached to the upper surface of the lower parting part at the construction stage of the basic constituent part.

  If it is the present invention, the appearance of the parting will not be deteriorated even with respect to the positional displacement and residual displacement at the time of the earthquake occurrence of the upper part and the lower part of the building basic component part, and draining as a parting Even when it is provided, the function as a drainer can be maintained. In addition, there is an effect that the protrusion of the parting upper part and the lower part can be reduced and the aesthetic appearance of the foundation can be improved.

It is explanatory drawing which showed the seismic isolation base structure concerning embodiment of this invention. It is explanatory drawing which showed the position displacement at the time of the earthquake in the base isolation base structure of FIG. It is an enlarged view of the base isolation structure of FIG. FIGS. 4A and 4B are explanatory views showing the position displacement at the time of earthquake in the base-isolated base structure of FIG. The same figure (A) (B) is explanatory drawing which showed the construction method of the seismic isolation base structure of FIG. It is an enlarged view of the seismic isolation basic structure concerning other embodiment of this invention. It is explanatory drawing which illustrated the formation location of the base isolation structure of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1 and FIG. 2, the foundation component 1 of the building 100 includes, for example, a concrete ground side wide part 11 and a building side narrow part 12, and the ground side wide part 11 is above the horizontal plane. It is divided into a divided portion 11a and a lower divided portion 11b. The upper surface of the lower dividing portion 11b is formed above the ground level and flush with the soil concrete 11c.

  The seismic isolation mechanisms 13 are provided at regular intervals between the upper dividing portion 11a and the lower dividing portion 11b. The seismic isolation mechanism 13 includes, for example, a lower side portion 13a in which a stainless steel plate is bonded to a rectangular polystyrene foam plate and an upper side portion 13b made of a polystyrene foam plate placed on the stainless steel plate. The lower side portion 13a is fixed to the upper surface of the lower dividing portion 11b with, for example, an adhesive. In addition, you may provide the said lower side part 13a on the leveling mortar formed in the upper surface of the said lower part part 11b. The upper portion 13b is slidable on the lower portion 13a and supports the upper dividing portion 11a.

  A lower portion of the return rubber device 14 is fixed on the lower dividing portion 11b or the soil concrete 11c. The upper part of the return rubber device 14 is fixed to the floor structure part of the building 100. The return rubber device 14 has a restoring force that returns the upper parting portion 11a that has been displaced in the event of an earthquake to the original position. However, in this restoration, the displacement may remain. Of course, there is a tradeoff with cost and the like, but the residual displacement can be made zero with a strong restoring force.

  A drainer 2 is provided as a parting line between the upper dividing part 11a and the lower dividing part 11b on the outdoor side. In the drainer 2, the upper component 21 and the lower component 22 are disposed to face each other, and can move horizontally with respect to each other, and maintain an opposed state with respect to the horizontal movement. The upper component 21 is attached to the lower surface of the upper divided portion 11a, and the lower component 22 is attached to the upper surface of the lower divided portion 11b.

  As shown in FIG. 3, between the upper component part 21 and the lower component part 22 of the drainer 2, a closing member 3 made of a gasket is provided so as to close the gap, and the gap closed state is positioned. It is also maintained against displacement. The closing member 3 is attached to the lower component 22, and the upper fin portion of the closing member 3 is in elastic contact with the lower surface of the upper component 21.

  The upper component 21 of the drainer 2 is composed of a first base part 21a, a second base part 21b, and a main body part 21c, which are, for example, aluminum extruded products. The 1st foundation | substrate part 21a has a long shape (for example, 910 mm) along the extending direction of the said base structure part 1, and is embed | buried under the lower surface of the said upper part division part 11a. The lower surface and the outer surface of the first base portion 21a are exposed from the upper dividing portion 11a. In addition, the mortar layer 111 is formed in the outer surface of the said upper part division part 11a, and the coating surface 112 is formed in the surface.

  The second base portions 21b are short members and are arranged at regular intervals along the extending direction of the basic component 1. The second base portion 21b is fitted and fixed to the lower surface of the first base portion 21a, and the outer surface rising piece of the second base portion 21b is screwed to the outer surface of the first base portion 21a. It is fixed to.

  The main body portion 21c has a smooth surface at the lower portion and a fitting piece at the upper portion, and is detachably fitted to the lower surface of the second base portion 21b. Further, for example, the length of the main body 21c is 910 mm, the depth of the main body 21c is about 110 mm, and the protruding amount of the main body 21c with respect to the painted surface 112 is about 35 mm. Yes.

  The lower component 22 of the drainer 2 includes a first base portion 22a, a second base portion 22b, and a main body portion 22c which are, for example, aluminum extruded products. The first base portion 22a is fixed to the upper surface of the lower dividing portion 11b with screws 24. The second base portion 22b is fixed to the first base portion 22a with screws 22d. The first base portion 22a and the second base portion 22b are short members and are arranged at regular intervals along the extending direction of the basic component 1. The main body portion 22c is detachably fitted to the second base portion 22b. The main body 22c is long and has a length of, for example, 910 mm. Further, an engagement groove is formed in the upper surface portion of the main body portion 22c, and the proximal end portion of the closing member 3 is fitted into the engagement groove. A concrete nail and an adhesive may be used in place of the screw 24 or the like.

  At the reference position where no displacement occurs, the closing member 3 is located in the middle in the depth direction of the main body 21c of the upper component 21. Since the depth dimension of the main body 21c is about 110 mm, the lower component 22 of the drainer 2 always faces a part of the lower surface of the upper component 21 with respect to the positional displacement of about ± 50 mm in the depth direction. Maintain the state to do. And the said closure member 3 can always contact | connect the lower surface of the said main-body part 21c with respect to the positional displacement of about +/- 50mm in the said depth direction. Of course, the above ± 50 mm is merely an example, and is not limited to this, and may be about ± 30 mm.

  If it is said structure, as shown to FIG. 4 (A) and FIG. 4 (B), even if the upper part part 11a and the lower part part 11b of the said base structure part 1 produce a position displacement by the occurrence of an earthquake, Since the upper component 21 of the drainer 2 can move relative to the lower component 22, the function of draining can be maintained. In addition, the gap generated in the foundation component 1 due to the presence of the seismic isolation mechanism 13 is narrowed by the upper component 21 and the lower component 22 of the drainer 2, so that rainwater enters from the gap. Can be suppressed.

  And when the closing member 3 which closes the clearance gap between the upper side component 21 and the lower side component 22 of the said drainer 2 is provided, and a gap closed state is maintained also with respect to a position displacement, the said upper side component 21 and the said It is possible to reliably prevent rainwater and small animals from entering through the gaps in the lower component 22. Note that, for example, a rubber roller may be used as the closing member, and the rubber roller may rotate while being in contact with the lower surface of the upper component portion 21 by the position displacement. Alternatively, the upper surface of the lower component 22 may be flattened and a plurality of closing members may be provided on the lower surface of the upper component 21.

  Further, if the upper component 21 of the drainer 2 is attached to the lower surface of the upper dividing portion 11a, the reference position for the position displacement can be set at the position of the lower surface of the upper dividing portion 11a. Compared with the case where the upper side component 21 is provided on the outer surface of the divided portion 11a and the reference position is set, the protrusion of the upper side component 21 can be reduced. Of course, the present invention also includes a configuration in which the upper constituent portion 21 is provided on the outer surface of the upper dividing portion 11a to set the reference position.

  Moreover, when a part or all of the base part of the upper part 21 of the drainer 2 is embedded in the lower surface of the upper part 11a, the base part of the upper part 21 of the drainer 2 is retrofitted to the upper part. Compared to the case where the lower surface of the portion 11a is mounted using an adhesive or the like, the mounting workability and the mounting strength can be significantly increased. Of course, the present invention also includes a configuration in which the base portion of the upper component portion 21 of the drainer 2 is attached to the lower surface of the upper dividing portion 11a by retrofitting.

  In addition, when the lower component 22 of the drainer 2 is attached to the upper surface of the lower dividing portion 11b, the lower portion 22 is lower than the case where the lower component 22 is provided on the outer surface of the lower dividing portion 11b. The protrusion of the component 22 can be reduced. Of course, the present invention includes a configuration in which the lower component 22 is provided on the outer surface of the lower dividing portion 11b.

  Next, the construction method of the seismic isolation foundation will be explained. As shown in FIG. 5 (A), the formwork 51 is installed, and concrete is struck to form the lower divided portion 11b in the foundation component 1. After curing, a plurality of seismic isolation mechanisms 13 are arranged at regular intervals on the upper surface of the lower dividing portion 11b.

  And as shown in FIG.5 (B), while installing the formwork 52 which produces the upper part part 11a of the ground side wide part 11, and the mold form 53 which produces the building side narrow part part 12, the said lower part part A removable space arranging member 6 is arranged between the seismic isolation mechanisms 13 on the upper surface of 11b. In addition, a surrounding member for forming a space surrounding the first base portion 22a is also arranged at a position on the upper surface of the lower dividing portion 11b and outside the seismic isolation mechanism 13. The space arrangement member 6 includes, for example, a plywood 61 and leg portions 62 that support the plywood. The leg portion 62 is a square-shaped member made up of two separable wedge members. And the 1st foundation | substrate part 21a of the upper side structure part 21 of the said drainer 2 is arrange | positioned on the plywood 61 of the said space arrangement | positioning member 6, and the said enclosure member.

  Next, concrete is struck on the space arranging member 6, the first base portion 21 a, and the seismic isolation mechanism 13 to form the upper dividing portion 11 a and the building-side narrow portion 12. After curing, the molds 51, 52, 53, the space arrangement member 6 and the enclosure member are removed. When the wedge-shaped member on the lower side of the leg part 62 is pulled out, the leg part 62 can be separated and removed. The plywood 61 is peeled off from the lower surface of the upper dividing portion 11a. At this time, the lower surface of the first base portion 21a is exposed. Thereafter, the upper component 21 and the lower component 22 of the drainer 2 are assembled. If it is this method, the structure by which a part or all of the foundation | substrate part of the upper side structure part 21 of the said drainer 2 is embed | buried under the lower surface of the said upper part division part 11a may be formed in the construction | assembly stage of the said base structure part 1. It becomes possible.

  In the construction method of the base isolation structure, the first base portion 22a and the second base portion 22b of the lower component portion 22 are disposed on the upper surface of the lower parting portion 11b and outside the base isolation mechanism 13. The upper dividing portion 11a may be formed in a state where the first base portion 22a and the second base portion 22b are covered with the enclosing member. According to this, it becomes possible to form the structure where the lower side component 22 of the drainer 2 is attached to the upper surface of the lower parting portion 11b at the construction stage of the basic component 1.

  In the above construction example, the entire first base portion 21a is embedded in the lower surface of the upper dividing portion 11a. However, only the protrusion formed on the upper surface of the first base portion 21a is the upper dividing portion. It may be embedded in the lower surface of 11a.

  Next, another embodiment will be described. As shown in FIG. 6, the basic component 1 of this embodiment is provided with a first closing member 3 </ b> A and a second closing member 3 </ b> B. The first closing member 3 </ b> A is a flexible member having a fin portion made of, for example, rubber or the like, similar to the closing member 3, and a gap between the upper component portion 21 and the lower component portion 22 of the drainer 2 is formed. Provided to close.

  The second closing member 3B is disposed on the indoor side of the first closing member 3A, and closes the gap between the upper component 21 and the lower component 22 of the drainer 2. The second closing member 3B is, for example, an independently foamed sealing member (for example, trade name EPT SEALER, etc.) having a rectangular cross section (for example, 10 mm × 10 mm square), and is suitable for water stoppage. It is cut and used. The second closing member 3B has an adhesive surface on the lower surface, and can be attached to the upper surface of the body portion 22c of the drainer 2. The second closing member 3B may have flexibility so as not to prevent the seismic isolation mechanism 13 from slipping.

  As shown in FIG. 7, the joint portion of the first closing member 3 </ b> A is formed at the joint portion of the drainer 2, and a gap is easily generated at the joint portion. The second closing member 3B is provided so as to straddle the indoor side of the gap at the joint. The joints are likely to occur at the corners and corners of the building. Two such second closing members 3B may be prepared for such corners and the ends thereof may be arranged close to each other, or one may be bent and used. In addition, a joint part may be produced by joining a plurality of drainers 2 even in a straight part other than the corner part, and the second closing member 3B may be provided in a gap between such joint parts.

  As described above, when the first closing member 3A and the second closing member 3B are provided, even if water enters from the gap between the joint portions of the first closing member 3A, the water further enters the indoor side. Can be prevented. Further, if the second closing member 3B is provided only at the joint portion of the first closing member 3A, the second closing member 3B is arranged in the entire arrangement region of the first closing member 3A. Compared with the configuration, cost reduction and workability can be improved.

  In the embodiment described above, the foundation component 1 includes the ground-side wide portion 11 and the building-side narrow portion 12, and the ground-side wide portion 11 is divided into the upper dividing portion 11a and the lower dividing portion 11b. However, as in Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-117280), the drainage is performed even in a configuration in which the ground-side wide portion 11 and the building-side narrow portion 12 are separated and a seismic isolation mechanism is provided therebetween. 2 can be provided. However, the upper component 21 of the drainer 2 is attached to the outer surface of the building-side narrow portion 12. The present invention can also be applied to the case of using a rolling bearing seismic isolation mechanism in which a steel ball is interposed between concave receiving members. Moreover, although the drainage 2 is shown as a parting, a simple parting that does not have the function of draining may be used, and even in this case, the position displacement at the time of the occurrence of the earthquake in the upper part and the lower part of the building basic component The appearance of the parting appearance is not deteriorated against the remaining displacement.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

DESCRIPTION OF SYMBOLS 1 Base component part 11 Ground side wide part 11a Upper part 11b Lower part 12 Building side narrow part 13 Seismic isolation mechanism 13a Lower part 13b Upper part 14 Return rubber device 2 Draining (parting off)
21 upper component 22 lower component 3 closing member 3A first closing member 3B second closing member

Claims (11)

Basic components of the building is divided into an upper divided portion and the lower divided portion by a horizontal plane located above the ground level, the parting with seismic isolation mechanism is interposed between the upper divided portion and the lower divided portion A space to be provided is formed, and the upper part of the upper part is attached to the upper part of the parting, while the lower part of the part is attached to the lower part of the part of the upper part and the lower part. A base-isolated foundation structure characterized in that the state of facing the component part is maintained even with respect to positional displacement.   The base isolation structure according to claim 1, wherein a closing member for closing a gap between the upper component part and the lower component part of the parting is provided, and the gap closed state is maintained even with respect to the position displacement. Seismic isolation base structure characterized by that.   3. The base isolation structure according to claim 2, wherein the closing member includes a first closing member and a second closing member disposed on the indoor side of the first closing member. Foundation structure.   4. The base-isolated base structure according to claim 3, wherein the first closing member is a flexible member having a fin portion, and the second closing member is a foam sealing member.   5. The base isolation structure according to claim 3, wherein the second closing member is provided at a joint portion of the first closing member.   The seismic isolation basic structure according to any one of claims 1 to 5, wherein the foundation component includes a ground-side wide portion and a building-side narrow portion, and the ground-side wide portion includes an upper dividing portion. Seismic isolation base structure characterized by being divided into lower divided parts.   The base isolation structure according to claim 6, wherein the upper part of the parting is attached to a lower surface of the upper parting part.   The base-isolated foundation structure according to claim 6 or 7, wherein a part or all of a base part of the upper part of the parting part is embedded in a lower surface of the upper parting part. Construction.   The base isolation structure according to any one of claims 1 to 8, wherein the lower part of the parting part is attached to the upper surface of the lower parting part. Forming the lower divided portion of the ground-side wide portion in the basic component of the building composed of the ground-side wide portion and the building-side narrow portion so that the upper surface is above the ground level ; and the lower divided portion A step of disposing a plurality of seismic isolation mechanisms on the upper surface of the substrate and disposing a removable space arranging member between the seismic isolation mechanisms, and a step of arranging a base part of the upper component part of the parting on the space arranging member When a step of forming an upper divided portion and the building side narrow portion of the ground-side wide portions on said spatial arrangement member and the base part and the seismic isolation mechanism, a step of removing the spatial arrangement member, the And a step of assembling the upper part and the lower part of the above-mentioned parting in the space obtained by removing the space arrangement member .   In the construction method of the seismic isolation foundation structure according to claim 10, the base part of the lower component part is disposed on the upper surface of the lower parting part, and the enclosure member that temporarily surrounds the base part is disposed in the state described above. The construction method of the base isolation structure characterized by forming an upper part and the said building side narrow part, and removing the said enclosure member after this formation.

Images