JP2020158983A - Earthquake-resistant shelter - Google Patents

Abstract

To provide an earthquake-resistant shelter with excellent earthquake resistant properties, excellent carrying-in properties of components into an existing building and excellent workability in the existing building.SOLUTION: In an earthquake-resistant shelter 100 installed in an existing building, two outer columns 10 of steel frames and beams 20 of steel frames are joined through non-rigid joint part 80 to form a portal frame 30, inner columns 40 of steel frames are joined to the beams 20 in the inside of the portal frame 30, and braces 50 are bridged between the outer columns 10 and the inner columns 40, and three or more walls for closing three or more portal frames 30 in plan view are formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to seismic shelters.

As an earthquake countermeasure for existing buildings such as houses, seismic reinforcement is being carried out, such as installing braces over the entire outer wall of the building. However, if seismic reinforcement is applied to the entire existing building, the financial burden will increase. Therefore, for example, even if the existing building collapses, it is possible to provide a space in the existing building that can guarantee the security of life. Seismic shelters, which can take earthquake countermeasures at a relatively low cost, are attracting attention. Earthquake-resistant shelters are facilities that secure the minimum space such as bedrooms even if a house collapses due to an earthquake. By installing it in an existing house, residents can quickly access and evacuate in the event of a large earthquake. can do.

Here, a wooden seismic shelter that is installed in a room of a detached house and constructed by a simple wooden frame nailing method with a rigid structure has been proposed. This wooden seismic shelter is equipped with a frame such as columns and beams and a face plate attached to the frame, and has a square cubic or rectangular parallelepiped box structure as a whole, and the wall has an entrance and exit. It is attached at one place (see, for example, Patent Document 1).

On the other hand, there has been proposed an earthquake shelter for wooden houses that can be assembled independently of an existing wooden building without being connected to the existing wooden building inside the existing wooden building constructed on the surface of the stratum. This shelter has a rigid frame structure that is embedded in the stratum and whose surface is exposed on the surface of the shelter, and a rigid frame structure that is fixed on the shelter foundation and assembled in a box shape using a plurality of steel frames. It is provided with a steel frame structure, and the side walls and ceiling constituting the shelter are assembled with a predetermined gap from the existing wooden building (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2013-181347 Japanese Unexamined Patent Publication No. 2014-031682

Since the seismic shelter described in Patent Document 1 is a wooden seismic shelter, there is a problem in the seismic resistance of the shelter itself, and there is a concern about brittle fracture in the event of a large earthquake. On the other hand, the earthquake shelter for wooden houses described in Patent Document 2 has a rigid frame structure with a rigid frame structure, so that there is little risk of brittle fracture in the event of a large earthquake, but the members are due to the rigid frame structure. The specifications (standards) of the members tend to increase, and the cross-sectional dimensions of the members tend to increase. When constructing a shelter inside an existing building, if the cross-sectional dimensions and specifications of the members constituting the shelter are large, there is a problem in terms of the carry-in property and the assembling property of the members. In particular, in the shelter described in Patent Document 2, since the shelter is formed in a state where a predetermined gap is secured between the shelter and the existing building, a large cross-sectional dimension of the member leads to a narrowing of the internal space of the shelter. Directly connected.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a seismic shelter which is excellent in earthquake resistance, easy to carry members into an existing building, and excellent in workability in an existing building.

In order to achieve the above object, one aspect of the seismic shelter according to the present invention is
An earthquake-resistant shelter installed in an existing building
The two outer columns of the steel frame and the beam of the steel frame are joined via a non-rigid joint to form a gate-shaped frame, and the inner column of the steel frame is joined to the beam inside the gate-shaped frame. A brace is laid between the outer pillar and the inner pillar.
It is characterized in that three or more of the gate-shaped frames form three or more walls that are closed in a plan view.

According to this aspect, two outer columns of a steel frame and a beam of a steel frame are joined via a non-rigid joint to form a gate-type frame that is not a rigid frame frame, and the outer columns in the gate-type frame. And the inner pillars arranged inside the braces are connected by braces to form a gate-shaped frame having a bearing wall having a so-called brace structure. Therefore, the cross section of the members such as beams and columns can be made smaller than that of the rigid frame frame, and the weight of the members can be reduced. Therefore, the seismic shelter has excellent portability of the members into the existing building and workability in the existing building. It becomes. In addition, the gate-shaped frame is formed by the steel frame, and the gate-shaped frame has a bearing wall, so that the shelter has excellent earthquake resistance.

Here, the "existing building" may be a wooden structure or a steel frame structure. For example, existing wooden buildings constructed according to the old seismic standards (seismic design standards of the Building Standards Act before May 1981) are likely to collapse in the event of a large earthquake, so the gate-type frame of the seismic shelter Exterior wall panels and ceiling panels should be attached to the building to prevent debris from collapsing existing buildings from entering the seismic shelter. Further, it is preferable to provide an entrance / exit on at least one outer wall panel. On the other hand, existing wooden and steel-framed buildings constructed according to the new earthquake-resistant standards are less likely to collapse in the event of a large earthquake, so the gate-type frame of the earthquake-resistant shelter does not have an outer wall panel. It may be a frame.

The "non-rigid joint" literally means a joint that is not a rigid joint, and means a joint in which the joint forms a semi-rigid joint or a pin joint by a plurality of medium bolts or the like. Since the outer columns and beams are joined via the joints of the structure, the gantry frame does not become a ramen frame. Further, by applying a brace including a turnbuckle as the brace, a brace having a length corresponding to the dimensions of the existing building can be easily formed.

In the gate type frame, for example, the inner pillars corresponding to the two outer pillars are provided at a predetermined distance from the outer pillars (for example, 1P or 0.5P, 1P is 910 mm, etc.). There is a form in which two bearing walls are built in by arranging one brace (one-sided flow brace) or both brace (sliding brace) in each outer pillar and inner pillar. In addition, an inner pillar corresponding to one of the two outer pillars is provided at a position separated from the outer pillar by a predetermined distance, and a brace is arranged between them to form one bearing wall. There is also a built-in form.

In addition, "three or more of the gate-shaped frames form three or more walls that are closed in a plan view" means that a cubic or rectangular parallelepiped seismic shelter is used in four general gate-shaped frames. In addition to the formed form, it includes a form in which a triangular columnar seismic shelter is formed in three gate-shaped frames, and a form in which a pentagonal columnar seismic shelter is formed in five gate-shaped frames. is there. For example, an earthquake-resistant shelter having an appropriate shape can be formed according to the shape of a room in an existing building in which the earthquake-resistant shelter is installed. In addition to the above-mentioned "wall" being formed by attaching the outer wall panel to the gate-shaped frame, the above-mentioned "wall" also includes a frame (skeleton of the frame) to which the outer wall panel is not attached as described above. To form.

Further, another aspect of the seismic shelter according to the present invention is characterized in that the adjacent gantry frame shares the outer column.

According to this aspect, by sharing the outer pillars with adjacent gantry frames, a required number of gantry frames can be formed with as few components as possible, and a seismic shelter can be constructed.

In addition, another aspect of the seismic shelter according to the present invention further comprises a steel base.
The outer column and the beam, and the inner column and the beam are bolted to each other via an upper connecting metal fitting.
The outer pillar and the base, and the inner pillar and the base are bolted to each other via a lower connecting metal fitting.

According to this aspect, the outer column or the inner column and the beam are bolted to each other via the upper connecting metal fitting, and the outer column or the inner column and the base are bolted to each other via the lower connecting metal fitting. Winning or losing between the members (which member is joined to the other member) does not occur, and the length of each member can be unified. As the upper connecting metal fittings and the lower connecting metal fittings, metal fittings formed in a cubic shape or a rectangular parallelepiped shape (so-called dice shape) can be applied by welding and joining a plurality of steel plates having a plurality of bolt holes.

In another aspect of the seismic shelter according to the present invention, a gap is provided between the wall and ceiling of the existing building and the wall and ceiling of the seismic shelter inside the existing building.
Anchor bolts project from above the new foundation concrete that is separated from the foundation concrete of the existing building.
It is characterized in that the lower connecting metal fitting is joined to the anchor bolt.

According to this aspect, due to the provision of a gap between the wall and ceiling of the existing building and the wall and ceiling of the seismic shelter, vibrations occur, for example, at different natural cycles during an earthquake. The existing building and the seismic shelters installed inside it can be vibrated independently without interfering with each other. Moreover, even if the existing building collapses, the influence on the seismic shelter can be suppressed due to the gap.

The "gap" can be set, for example, by calculating the amplitude when the seismic shelter vibrates during a large earthquake and setting it to be equal to or larger than the calculated amplitude.

Another aspect of the seismic shelter according to the present invention is characterized in that additional columns having a length that does not interfere with the brace are joined to the opposite side surfaces of both the outer column and the inner column. ..

According to this aspect, the outer column and the inner column are reinforced by the additional columns by joining additional columns having a length that does not interfere with the brace on the opposite side surfaces of both the outer column and the inner column. It is possible to form a seismic shelter with even better seismic resistance. Here, gusset plates to which braces are attached are pre-welded to the outer pillar and the inner pillar at the vertical positions of the opposite side surfaces thereof. Therefore, the additional columns are joined to the insides of the upper and lower gusset plates by welding or the like on the opposite side surfaces of the outer columns and the inner columns.

As can be understood from the above description, according to the seismic shelter of the present invention, it is possible to provide a seismic shelter having excellent seismic resistance, easy to carry members into an existing building, and excellent workability in an existing building. it can.

It is a perspective view which shows an example of the seismic shelter which concerns on embodiment in the aspect which is installed in the existing building. It is an exploded perspective view of an example of an outer pillar, an inner pillar, and a brace. It is a perspective view explaining that the outer column and the beam are bolt-joined via the upper connecting metal fitting. It is a perspective view explaining that the foundation concrete, the base and the outer column are bolted together via the lower connecting metal fittings. (A) is a view taken along the V direction of FIG. 1, and is a diagram showing an example of the plan view shape of the seismic shelter according to the embodiment, and (b) to (d) are the plan view shapes of the seismic shelter. It is a figure which shows another example.

Hereinafter, the seismic shelter according to the embodiment will be described with reference to the attached drawings. In the present specification and drawings, substantially the same components may be designated by the same reference numerals to omit duplicate explanations.

[Seismic shelter according to the embodiment]
An example of the seismic shelter according to the embodiment will be described with reference to FIGS. 1 to 4. Here, FIG. 1 is a perspective view showing an example of the seismic shelter according to the embodiment in a mode in which it is installed in an existing building. Further, FIG. 2 is an exploded perspective view of an example of the outer column, the inner column, and the brace, and FIG. 3 is a perspective view for explaining that the outer column and the beam are bolted together via the upper connecting metal fittings. .. Further, FIG. 4 is a perspective view for explaining that the foundation concrete, the base, and the outer pillar are bolted together via the lower connecting metal fittings.

The seismic shelter 100 shown in FIG. 1 is installed inside, for example, one living room of an existing wooden or steel-framed building. In FIG. 1, the walls and columns of the existing building, the beams forming the ceiling, etc. are shown by single-point chain lines, but the seismic shelter 100 is the wall (pillar) of the existing building with respect to the constituent members of the existing building. It has a gap t1 between the two, and a gap t2 between it and the ceiling (beam) of the existing building. The gaps t1 and t2 can be set based on, for example, the amplitude of the seismic shelter 100 assumed in the event of a large earthquake.

The seismic shelter 100 has a gate-shaped frame 30 forming four side surfaces, a base 60 connected to the legs of the gate-shaped frame 30, and a foundation concrete 70 that supports the base 60. A gate-shaped frame 30 or the like is supported on a new foundation concrete 70 separated from a reinforced concrete foundation concrete 70A (cloth foundation) that supports an existing building. The gantry frame 30 has two outer columns 10 of steel frames formed of square steel pipes and steel beams 20 formed of H-shaped steel, and these are upper connecting metal fittings 80 (an example of a non-rigid joint). It is formed by being joined via.

As is clearly described in FIG. 2, of the outer columns 10, an additional column 11 formed of a square steel pipe having a length that does not interfere with the brace 50 is welded to the facing side surface 10a facing the inner column 40. It is joined. Further, a gusset plate 12 to which the brace 50 is bolted is joined by welding at the upper and lower positions of the additional pillar 11 in the facing side surface 10a of the outer pillar 10. The outer pillar 10 can be reinforced by the additional pillar 11 by joining the additional pillar 11 having a length that does not interfere with the brace 50 on the facing side surface 10a of the outer pillar 10.

Further, a stigma metal fitting 13 is joined to the upper end of the outer column 10 by welding, and a column base metal fitting 14 is joined to the lower end of the outer column 10 by welding. Both the stigma metal fitting 13 and the column base metal fitting 14 are processed into a block shape by arranging a plurality of flat steels in a grid pattern and joining them by welding to each other, and the upper connecting metal fitting 80 and the lower connecting metal fitting 85. It has bolt holes 13a and 14a through which bolts are inserted when they are bolted together.

Further, as shown in FIG. 2, of the inner columns 40, an additional column 41 formed of a square steel pipe having a length that does not interfere with the brace 50 is joined to the facing side surface 40a facing the outer column 10 by welding. ing. Further, a gusset plate 42 to which the brace 50 is bolted is joined by welding at the upper and lower positions of the additional pillar 41 in the facing side surface 40a of the inner pillar 40. The stigma 43 is also joined by welding at the upper end of the inner column 40, and the column base metal fitting 44 is also joined by welding at the lower end of the inner column 40. Both the stigma metal fitting 43 and the column base metal fitting 44 are processed into a block shape by arranging a plurality of flat steels in a grid pattern and joining them by welding to each other, and the upper connecting metal fitting 80 and the lower connecting metal fitting 85. It has bolt holes 43a and 44a through which bolts are inserted when they are bolted together. Further, the inner pillar 40 can be reinforced by the additional pillar 41 because the additional pillar 41 having a length that does not interfere with the brace 50 is joined to the facing side surface 40a of the inner pillar 40.

Further, as shown in FIG. 2, the brace 50 has a flat steel 51, connecting plates 52 and 54, and a turnbuckle 53. A connection plate 52 having a bolt hole 52a is joined to one end of the flat steel 51 by welding, and one end of a turnbuckle 53 is joined to the other end of the flat steel 51 by welding. Further, the other end of the turnbuckle 53 is welded to the connection plate 54 in which the bolt hole 54a is provided. The bolt hole 52a of the connection plate 52 and the bolt hole 12a of the gusset plate 12 are positioned to form a communication hole, and the bolt hole 54a of the connection plate 54 and the bolt hole 42a of the gusset plate 42 are positioned to form a communication hole. Bolts 91 are inserted into the respective communication holes and fixed by tightening nuts 92.

Since the brace 50 is provided with the turnbuckle 53 inside, the brace 50 having a length corresponding to the dimensions of the existing building can be easily formed.

Returning to FIG. 1, the gate type frame 30 is provided with two inner pillars 40 inside, and two braces 50 are hung between the inner pillars 40 corresponding to each of the two outer pillars 10. Two bearing walls are formed by the attachment. That is, all of the four gate-shaped frames 30 constituting the seismic shelter 100 in the illustrated example have two bearing walls inside, but one inner pillar 40 is arranged inside the gate-shaped frame 30. It is also possible that one bearing wall is formed by attaching two braces 50 to the outer pillar 10.

In the seismic shelter 100 shown in FIG. 1, in the four gate-shaped frames 30 forming the four side surfaces, the adjacent gate-shaped frames 30 share the outer pillar 10, and therefore, the seismic shelter 100 has four outer pillars. Four gate-shaped frames 30 are formed by 10. In this way, the adjacent gate-shaped frames 30 share the outer pillar 10, so that the required number of gate-shaped frames 30 (four in the illustrated example) is formed by as few components as possible, and the seismic shelter 100 is formed. Can be configured.

Further, each beam 20 of the adjacent gantry frame 30 is connected to the shared upper connecting metal fitting 80 via a bolt. Specifically, as shown in FIG. 3, a plurality of flat steels are joined to each other by welding to form a rectangular parallelepiped upper connecting metal fitting 80, and a plurality of bolts are provided on each side surface of the upper connecting metal fitting 80. Holes 81 are formed, and a plurality of bolt holes 82 are formed on the top end surface and the bottom end surface, respectively.

By placing the upper connecting metal fitting 80 on the top end surface of the stigma metal fitting 13, the bolt hole 82 formed on the lower end surface of the stigma metal fitting 13 and the bolt hole 13a provided on the top end surface of the stigma metal fitting 13 communicate with each other. To form a communication hole. The upper connecting metal fitting 80 is bolted to the top end surface of the capital metal fitting 13 by inserting the bolt 91 from the inside of the capital metal fitting 13 and screwing the tip of the bolt 91 into the bolt hole 82 via the bolt hole 13a. To.

The top end surface of the stigma 13 has a width on which the lower end surface of the upper connecting metal fitting 80 and the end of the beam 20 are placed, and the upper connecting metal fitting is bolted to the top surface of the stigma 13. The end of the beam 20 is placed on the side of the 80. An end plate 21 having a plurality of bolt holes 21a is formed at the end of the beam 20 by welding, and a bolt hole 20a is provided at the lower flange near the end of the beam 20. A plurality of bolt holes 81 and 20a are positioned to form a communication hole in a state where the end portion of the beam 20 is placed on the top end surface of the stigma metal fitting 13 and the end plate 21 is in contact with the side surface of the upper connecting metal fitting 80. To do.

The bolt 91 inserted upward through the bolt hole 13a provided on the top end surface of the stigma metal fitting 13 is screwed into the bolt 20a of the beam 20 mounted on the top end surface of the stigma metal fitting 13, and is screwed into the lower flange. By tightening with the tightening nut 92 from above, the stigma 13 and the beam 20 are bolted together.

Further, in a state where the end plate 21 is in contact with the side surface of the upper connecting metal fitting 80, the bolt 91 is screwed into the corresponding bolt holes 81 and 21a from the beam 20 side of the end plate 21 to connect upward. The metal fitting 80 and the beam 20 are bolted together. In this way, the beam 20 is joined to the outer column 10 via the stigma 13 and the upper connecting metal fitting 80.

Here, the joint portion between the outer column 10 and the beam 20 that is bolted via the upper connecting metal fitting 80 is not a rigid joint portion formed by welding or a plurality of high tension bolts, and thus is a non-rigid joint portion. .. The non-rigid joint 80 includes both a pin joint that does not completely transmit a bending moment and a semi-rigid joint that transmits a certain amount of bending moment but does not transmit 100% of the bending moment. In any of the joint forms, the gantry frame 30 does not form a rigid frame frame because the beams and columns are not joined via the rigid joints, and the two bearing walls formed by the plurality of braces 50. Form a brace structure with a built-in wall.

As described above, since the seismic shelter 100 has the gate type frame 30 having a brace structure, the cross-sectional dimensions of the beams 20 and the outer columns 10 can be made smaller than those of the beams and columns of the rigid frame frame, and the members are lightweight. Can be converted. Therefore, the seismic shelter 100 has excellent portability of members into the existing building and workability in the existing building. Further, the outer column 10, the inner column 40, and the beam 20 are all formed of steel frames, and the gate-shaped frame 30 has a bearing wall, so that the earthquake-resistant shelter 100 has excellent earthquake resistance.

As shown in FIG. 4, the seismic shelter 100 is separated from the foundation concrete 70 of the existing building (with a gap), and after constructing a new foundation concrete 70, it is downward with respect to the foundation concrete 70. The legs are formed by bolting the outer pillar 10 and the base 60 via the connecting metal fitting 85.

The new foundation concrete 70 is buried with one anchor bolt 71 projecting upward. The lower connecting metal fitting 85 is formed in a cubic shape by joining a plurality of flat steels to each other by welding, and a plurality of bolt holes 86 are formed on each side surface of the lower connecting metal fitting 85, and a plurality of bolt holes 86 are formed on the top surface. Bolt hole 87 is opened, and one bolt hole 87 is opened on the lower end surface.

By inserting the bolt hole 87 on the lower end surface of the lower connecting metal fitting 85 into the anchor bolt 71 and rotating the lower connecting metal fitting 85, the lower connecting metal fitting 85 is screwed into the anchor bolt 71 and is screwed into the foundation concrete 70. On the other hand, the lower connecting metal fitting 85 is bolted.

Then, on the top end surface of the foundation concrete 70, a steel frame base 60 formed of H-shaped steel is placed on the side surface of the lower connecting metal fitting 85. An end plate 61 having a plurality of bolt holes 61a is joined to the end of the base 60 by welding.

On the top end surface of the foundation concrete 70, the bolt 91 is screwed into the corresponding bolt holes 86, 61a from the base 60 side of the end plate 61 in a state where the end plate 61 is in contact with the side surface of the lower connecting metal fitting 85. As a result, the lower connecting metal fitting 85 and the base 60 are bolted together.

Further, a bolt hole 61b is provided in the upper flange near the end of the base 60. In a state where the lower end surface of the column base metal fitting 14 of the outer column 10 is placed on the top end surface of the lower connecting metal fitting 85 and the upper surface of the upper flange of the base 60, the plurality of bolt holes 14a of the column base metal fitting 14 are bolted. Positioned in the holes 87 and 61b to form a communication hole.

The bolt 91 inserted downward through the bolt hole 14a provided in the lower end surface of the column base metal fitting 14 is the lower connecting metal fitting 85 on which the lower end surface of the column base metal fitting 14 is placed and the bolt 87 of the base 60. , 61b and tightened from below the upper flange with the tightening nut 92, the column base metal fitting 14 is bolted to the lower connecting metal fitting 85 and the base 60. In this way, the foundation concrete 70, the outer pillar 10 and the base 60 are joined via the lower connecting metal fitting 85. The bolt holes 43a and 44a of the stigma 43 and the column base 44 at the upper and lower ends of the inner column 40 are positioned at bolt holes (not shown) provided in the lower flange of the beam 20 and the upper flange of the base 60. By forming a communication hole and inserting a bolt into the communication hole, the inner pillar 40, the beam 20 and the base 60 are bolted together.

In the seismic shelter 100, the outer pillar 10 and the beam 20, the foundation concrete 70 and the outer pillar 10 and the base 60 are bolted to each other via the upper connecting metal fitting 80 and the lower connecting metal fitting 85, so that they are bolted to each other. Winning and losing of the members (which member is joined to the other member) does not occur, and the length of each member can be unified.

The seismic shelter 100 shown in FIG. 1 is shown in a form having a wall of a frame (skeleton of the frame) in which an outer wall panel is not attached to the gate type frame 30, but the gate type frame 30 has an iron plate, plywood, etc. It may have a wall to which the outer wall panel formed by the above is attached, and further, it may have a wall to which the inner wall panel formed of gypsum board or the like is attached to the gate type frame 30. ..

The plan view shape of the seismic shelter 100 shown in FIG. 1 is a V-direction arrow view of FIG. 1, and is a square (or rectangle) as shown in FIG. 5A simulating the plane contour of the seismic shelter 100. ) However, the seismic shelter may have at least three or more gate-shaped frames forming three or more walls that are closed in a plan view. Therefore, the plan view shape of the seismic shelter is based on the concept that the triangle shown in FIG. 5 (b), the pentagon shown in FIG. 5 (c), and the circle shown in FIG. 5 (d) (the circle is an infinite polygon). Based on this, circles are included in the formation of three or more sides), and various plane-shaped seismic shelters can be applied.

It should be noted that the configuration or the like described in the above embodiment may be another embodiment in which other components are combined, and the present invention is not limited to the configuration shown here. This point can be changed without departing from the spirit of the present invention, and can be appropriately determined according to the application form thereof.

10: Outer column, 10a: Opposing side surface, 11: Additional column, 12: Gusset plate, 13: Column head metal fitting, 14: Column base metal fitting, 20: Beam, 21: End plate, 30: Gate type frame, 40: Inner pillar , 40a: facing side surface, 41: additional column, 42: gusset plate, 43: column head metal fitting, 44: column base metal fitting, 50: brace, 51: flat steel, 52: connection plate, 53: turn buckle, 54: connection plate , 60: Foundation, 61: End plate, 70: New foundation concrete (foundation concrete), 70A: Foundation concrete of existing building, 80: Upper connecting metal fittings (non-rigid joint), 81, 82: Bolt holes, 85: Lower connecting bracket, 86, 87: Bolt hole, 91: Bolt, 92: Tightening nut, 100: Seismic shelter

Claims (5)

An earthquake-resistant shelter installed in an existing building
The two outer columns of the steel frame and the beam of the steel frame are joined via a non-rigid joint to form a gate-shaped frame, and the inner column of the steel frame is joined to the beam inside the gate-shaped frame. A brace is laid between the outer pillar and the inner pillar.
A seismic shelter characterized in that three or more of the gate-shaped frames form three or more walls that are closed in a plan view. The seismic shelter according to claim 1, wherein the adjacent gate-shaped frame shares the outer pillar. It has a steel base and
The outer column and the beam, and the inner column and the beam are bolted to each other via an upper connecting metal fitting.
The seismic shelter according to claim 1 or 2, wherein the outer pillar and the base, and the inner pillar and the base are bolted to each other via a lower connecting metal fitting, respectively. Inside the existing building, a gap is provided between the wall and ceiling of the existing building and the wall and ceiling of the seismic shelter.
Anchor bolts project from above the new foundation concrete that is separated from the foundation concrete of the existing building.
The seismic shelter according to claim 3, wherein the lower connecting metal fitting is joined to the anchor bolt. The invention according to any one of claims 1 to 4, wherein additional columns having a length that does not interfere with the brace are joined to the opposing side surfaces of both the outer column and the inner column. Seismic shelter.

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