JP4097089B2 - Seismic isolation anchor bolts and seismic isolation structures for buildings - Google Patents

Description

  The present invention relates to an anchor bolt having seismic isolation used for fixing a foundation or a leg of a building to a foundation of concrete or reinforced concrete in construction work, and a building exemption using the seismic isolation anchor bolt. It relates to seismic structures.

Conventionally, as shown in the side view of FIG. 8, the anchor bolt embedded in the foundation of the concrete or reinforced concrete in the construction work is composed of, for example, a round steel 1 as shown in FIG. For example, a lower embedded bolt portion 1b that is bent in an L shape (sometimes U-shaped) or attached to an anchor plate (not shown), and tightened to the other end, that is, the upper end The upper bolt portion 1a is formed with a screw portion 1c.
When the anchor bolt 1 is used in construction work, the lower embedded bolt portion 1b is embedded in the foundation of concrete or reinforced concrete, and the tightening nut 2 is screwed into the tightening screw portion 1c. By tightening, the upper bolt portion 1a is firmly fixed to the foundation by fixing the steel or wooden pillar, the leg portion or the base of the wall via the washer 3.

However, even if the concrete or reinforced concrete foundation and the foundation or leg of the building are securely fixed by the anchor bolts of the above prior art, the vibration of the ground that occurs at the time of the earthquake is directly transmitted to the building through the foundation, Causes shaking of things.
Therefore, the subject of this invention is providing the seismic isolation anchor bolt provided with the function which suppresses this shaking, and the seismic isolation structure of the building which uses this seismic isolation anchor bolt.

The present inventor has solved the above problem by the following means.
(1) A seismic isolation anchor bolt that absorbs vertical and horizontal seismic energy generated during an earthquake and suppresses shaking occurring in a building, and a high-strength elastic body for absorbing the seismic energy is an anchor bolt. The high-strength elastic body is composed of a wire-like elastic body in which a number of steel wires or reinforced resin wires are bundled together and twisted together. It becomes, and seismic isolation anchor bolt bottom of the wire-like elastic body is characterized by comprising the Awa twisted at the upper part to be configured in a ring-shaped forming body that is embedded in the concrete foundation.
(2) The seismic isolation anchor bolt as set forth in (1) above, wherein the wire-like elastic body is a strand of PC steel.
(3) The upper part of the wire-shaped metal or reinforced resin elastic body is joined to the upper bolt part by being crimped to the upper bolt part fastened to the base or leg of the building. The seismic isolation anchor bolt according to item (1) or (2), characterized in that
(4) The seismic isolation structure of a building, wherein the lower part of the seismic isolation anchor bolt according to any one of (1) to (3) is embedded in the foundation of the building .
(5) A base or leg is inserted into a long groove recessed in a solid foundation of a building by cutting the outer periphery thereof, and the seismic isolation anchor according to any one of (1) to (3) above A seismic isolation structure for buildings, characterized in that the lower part of the bolt is embedded in the solid foundation of the building.
(6) It is characterized in that an elastic resin such as rubber, urethane, silicon resin, etc. is filled in the long groove recessed in the solid foundation of the building and the side wall space of the base or the outer peripheral edge of the leg. The seismic isolation structure for buildings as set forth in (5) above.

Moreover, the following can be mentioned as another form which concerns on this invention.
(1) A seismic isolation anchor bolt that absorbs vertical and horizontal seismic energy generated during an earthquake and suppresses shaking occurring in a building, and a high-strength elastic body for absorbing the seismic energy is an anchor bolt. A seismic isolation anchor bolt characterized by comprising a middle part or a lower part.
(2) The seismic isolation anchor bolt according to (1) above, comprising an elastic body surrounding the abdomen of the anchor bolt.

  (3) The previous item (1) or (2), wherein the elastic body surrounding the abdomen of the anchor bolt is a coiled metal or reinforced resin elastic body, or a plate-like rubber-like elastic body. The seismic isolation anchor bolt described in 1.

  (4) The high-strength elastic body is made of a wire-shaped metal or reinforced resin elastic body, and the upper portion thereof is crimped to an upper bolt portion that is fastened and fixed to a base or a leg portion of a building. The seismic isolation anchor bolt according to any one of the preceding items (1) to (3), wherein the seismic isolation bolt is coupled to the upper bolt portion by the above.

  (5) The high-strength elastic body is made of a wire-shaped metal or reinforced resin elastic body, and the lower portion thereof is crimped to the lower bolt portion embedded in the foundation of the building. The seismic isolation anchor bolt according to any one of the preceding items (1) to (4), wherein the seismic isolation anchor bolt is combined with a portion.

  (6) The high-strength elastic body is made of a wire-shaped metal or reinforced resin elastic body, and a lower part of the high-strength elastic body constitutes the entire portion embedded in the foundation of the building. The seismic isolation anchor bolt according to the preceding items (1) to (4).

  (7) The coiled elastic body is provided in a state of being pressed along the vertical direction in or on the base or leg of the building, surrounding the anchor bolt, and the base of the building Alternatively, the base-isolated anchor bolt according to any one of (3) to (5), wherein a plate-like rubber-like elastic body surrounding the anchor bolt is provided at a portion between the leg portion and the foundation. .

  (8) The seismic isolation anchor bolt according to any one of (4) to (7) above, wherein the wire-shaped metal high-strength elastic body is a stranded wire of PC steel.

  (9) A base-isolated structure of a building, characterized in that the lower part of the base-isolated anchor bolt described in any one of (1) to (8) is embedded in the foundation of the building. .

  (10) A base or leg is inserted into a long groove recessed in a solid foundation of a building with its outer periphery cut off, and the seismic isolation anchor according to any one of (1) to (8) above A seismic isolation structure for buildings, characterized in that the lower part of the bolt is embedded in a solid foundation of the building.

  (11) A long groove recessed in a solid foundation of a building and a side wall portion space of a base or a peripheral edge portion of a leg portion are filled with an elastic resin such as rubber, urethane, or silicone resin. The seismic isolation structure for a building according to (10) above.

  According to the present invention, in a foundation structure that occupies a particularly important position for obtaining the earthquake resistance of a building, an excellent anchor bolt that serves to connect a foundation of concrete or reinforced concrete and a foundation or a leg of the building is excellent. Since seismicity can be imparted, a building with excellent seismic isolation can be provided.

BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment and reference example of the seismic isolation anchor bolt of the present invention will be described based on the drawings of the examples and the reference examples .
[Reference Example 1]

FIG. 1 shows a side view of a reference example of the seismic isolation anchor bolt according to the present invention. In the figure, 1A is an anchor bolt made of round steel with a diameter of 16 mm, 1Ab is a portion embedded in the concrete foundation of the anchor bolt 1A, that is, a lower bolt portion, and the tip of the lower bolt portion 1Ab divided and displayed in the figure is L It has a letter shape. Reference numeral 1Aa denotes an upper bolt portion of the anchor bolt 1A, and a fastening nut 2A for fastening and fixing the anchor bolt 1A to a base or a leg portion (not shown) of the building is screwed to an upper end portion thereof. The tightening screw portion 1Ac is engraved.
Further, concave portions 5Aa and 5Ab are provided on the opposing end surfaces of the upper bolt portion 1Aa and the lower bolt portion 1Ab. These concave portions 5Aa and 5Ab are made of, for example, a stranded wire of a steel wire or a reinforced resin wire. An upper part 4Aa and a lower part 4Ab of a wire-like elastic body 4A having a diameter of 12 mm are respectively inserted and pressure-bonded, and the upper bolt part 1Aa and the lower bolt part 1Ab are integrally coupled via the wire-like elastic body 4A.

According to the anchor bolt 1A having the above-described configuration, a wire shape straddles both the lower bolt portion 1Ab embedded in the concrete foundation and the upper bolt portion 1Aa fastened and fixed to the foundation or leg of the building. Since the elastic body 4A is provided, the vertical seismic energy that the building receives through the foundation and the base or legs during an earthquake is absorbed by the elasticity of the wire 4A, and as a result, the shaking due to the seismic energy of the building is effectively It can be suppressed.
[Reference Example 2]

It shows a side view of another reference example of base isolation anchor bolt in FIG. In the figure, 1B is an anchor bolt made of a round steel with a diameter of 16 mm, 1Bb is a portion embedded in the concrete foundation of the anchor bolt 1B, that is, a lower bolt portion. Similarly, it is L-shaped. Further, 1Ba is an upper bolt portion of the anchor bolt 1B, and a fastening nut 2B for fastening and fixing the anchor bolt 1B to a base or a leg portion (not shown) of the building is screwed to the upper end portion thereof. The tightening screw portion 1Bc is engraved.
Also in this anchor bolt 1B, recesses 5Ba and 5Bb are provided on the opposing end surfaces of the upper bolt portion 1Ba and the lower bolt portion 1Bb, and as described in the reference example 1, these recesses 5Ba and 5Bb are as follows. Upper part 4Ba and lower part 4Bb of wire-like elastic body 4B having a diameter of 12 mm made of stranded wires of steel wire or reinforced resin wire are respectively inserted and pressure-bonded, and upper bolt part 1Ba and lower bolt part 1Bb are interposed via wire-like elastic body 4A. Are connected together.

In the anchor bolt 1B of the present reference example , as shown in the drawing, the surfaces 4Ba ′ and 4Bb ′ of the upper portion 4Ba and the lower portion 4Bb of the wire-like elastic body 4B are both formed into male threads, and the upper bolt portion 1Ba And the inner side surfaces 5Ba ′ and 5Bb ′ of the recesses 5Ba and 5Bb of the lower bolt portion 1Bb are also formed with female threads so as to be screwed into the male threads of the upper surface 4Ba ′ and the lower surface 4Bb ′ of the wire-like elastic body, respectively. Has been. In order to show the screwing portions of these screws, FIG. 2 shows a state in which a lower end portion of the upper bolt portion 1Ba and a part of an upper end portion of the lower bolt portion 1Bb are cut off.

Further, a tightening screw portion for screwing a tightening nut 2B that presses down the presser washer 3Ba and fastens the anchor bolt 1B to a base or a leg (not shown) is screwed to the upper end portion of the upper bolt portion 1Ba. 1Bc is carved.
Further, a receiving washer 3B ′ is provided integrally with the upper bolt portion 1Ba at the lower end of the upper bolt portion 1Ba, and a coil-shaped elastic member is formed so as to surround the upper bolt portion 1Ba on the upper surface of the receiving washer 3B ′. A body 7B is placed, and a press washer 3B is slidably placed on the coiled elastic body 7B.

  When the tightening nut 2B is tightened along the screw engraved in the tightening screw portion 1Bc, the base or leg portion (not shown) of the building is pushed down through the washer 3Ba, and the lower portion of the base or leg portion is pressed. Since the pressing washer 3B that is in contact is also pushed down, the coiled elastic body 7B disposed between the pressing washer 3B and the receiving washer 3b 'is pressed and contracted, and the repulsive force required for seismic isolation is applied to the coiled elastic body 7B. Will be granted.

  The anchor bolt 1B shown in FIG. 2 has an upper bolt formed by crimping the upper and lower portions of a wire-like elastic body 4B made of steel wire or reinforced resin wire to the upper bolt portion 1Ba and the lower bolt portion 1Bb, respectively. An example of a seismic isolation anchor bolt provided with a steel coiled elastic body 7B in which the part 1Ba and the lower bolt part 1Bb are coupled to each other and further surrounds a part of the anchor bolt 1B is shown.

According to such an anchor bolt 1B, the wire-like elastic body 4B straddles both the lower bolt portion 1Bb embedded in the concrete foundation and the upper bolt portion 1Ba fastened to the base or the leg portion. Furthermore, a steel coiled elastic body 7B that absorbs the seismic energy in the vertical direction of the anchor bolt 1B is provided so as to surround the anchor bolt 1B, so that the building passes through the foundation and the base during the earthquake. The vertical and horizontal seismic energy received is absorbed by both the wire-like elastic body 4B and the coil-like elastic body 7B, and as a result, it is possible to effectively suppress the shaking that the building receives from the seismic energy.
[Example 1]

The side view of the Example of the seismic isolation anchor bolt by this invention was shown in FIG. Sometimes, 1C is an anchor bolt, 1Ca is an upper bolt portion, and from a wire-like elastic body 4C in which a number of steel wires or reinforced resin wires are bundled together and twisted together. Therefore, the lower end portion of the wire-like elastic body 4C is configured as a ring-shaped formed body so that the contact portion between the wire-like elastic body 4C and the concrete foundation is increased, and the coupling between the two becomes strong. Are twisted together at the upper part .

  Also in this embodiment, the upper 4Ca of the wire-like elastic body 4C is inserted and crimped into the recess 5Ca of the upper bolt 1Ca made of round steel having a diameter of 16 mm, and the lower bolt 1Cb and the upper bolt 1Ca are made of wire 4C. And integrated. Further, a fastening screw portion 1Cc for screwing a fastening nut 2C for fastening and fixing the anchor bolt 1C to a base or a leg portion (not shown) of the building is attached to the upper end portion of the upper bolt portion 1Ca. Is carved.

According to such an anchor bolt 1C, since the entire lower bolt portion 1Cb embedded in the foundation is composed of the wire-like elastic body 4C, the vertical structure receives through the foundation and the base or leg during an earthquake. direction and seismic energy the horizontal is absorbed by the wire 4C, shaking buildings undergo the seismic energy is Ru is effectively suppressed.

Next, the seismic isolation structure of the building using the said seismic isolation anchor bolt is demonstrated based on the figure of the Example.
<< Seismic isolation structure 1 >>
First, FIG. 4 shows the seismic isolation of a building using the seismic isolation anchor bolt shown in FIG. 2 together with a plate-like rubber-like elastic body surrounding the anchor bolt in a portion between the foundation of the building and the base or leg. It is a vertical sectional view showing the structure.

  In FIG. 4, 1D is an anchor bolt made of a round steel having a diameter of 16 mm, and the lower bolt portion 1Db is embedded in the concrete foundation S. On the other hand, the upper bolt portion 1Da of the anchor bolt 1D is formed in a bolt hole formed in the base or the leg portion T, and a part or all of the tightening screw portion 1Dc formed on the upper end portion thereof is on the base or the leg portion T. The washer 3Da and the tightening nut 2D are attached to the protruding portion.

  The upper bolt portion 1Da and the lower bolt portion 1Db are, as in the case of the seismic isolation anchor bolt 1B shown in FIG. 2, a wire-like elastic body in which the upper portion and the lower portion are respectively crimped to the upper bolt portion 1Da and the lower bolt portion 1Db. Combined by 4D.

  A coiled elastic body 7D surrounding the upper bolt portion 1Da is provided between the press washer 3D and the receiving washer 3D ′ in the coiled elastic body receiving groove Ta provided at the lower end of the base or the leg T. ing. A plate-like rubber-like elastic body 8D is disposed around the wire-like elastic body 4D exposed between the upper bolt portion 1Da and the lower bolt portion 1Db.

Such a seismic isolation structure is constructed as follows.
1. The lower bolt part 1Db of the anchor bolt 1D is embedded in the concrete foundation S with the upper bolt part 1Da of the anchor bolt 1D and a part of the wire-like elastic body 4D exposed.
2. The exposed upper bolt portion 1Da is passed through a hole formed in the plate-like rubber-like elastic body 8D, and the plate-like rubber-like elastic body 8D is placed on the concrete foundation S.
3. A coiled elastic body accommodation groove Ta shallower than the height of the coiled elastic body 7D before tightening is processed and formed in the lower end portion of the base or the bolt hole of the leg T through which the upper bolt portion 1Da is passed.
4). The receiving washer 3D ′, the coiled elastic body 7D, and the holding washer 3D are sequentially inserted into the upper bolt portion 1Da exposed on the rubber-like elastic body 8D.
5. The upper bolt portion 1Da is passed through the bolt hole of the base or the leg T, and the coiled elastic body 7D in the coiled elastic body receiving groove Ta is pressed between the press washer 3D and the receiving washer 3D ′. Store.
6). The foundation or leg T is fixed to the foundation by tightening it with a fastening nut 2D screwed to the fastening screw part 1Dc of the upper bolt part 1Da protruding above the foundation or leg T through the washer 3Da.

The seismic isolation structure of a building constructed by such construction can absorb seismic energy as follows.
1 '. The coiled elastic body 7D, the presser washer 3D, the receiving washer 3D ′, the presser washer 3Da, and the wire-like elastic body 4D tightened by the tightening nut 2D and the base or leg T are fixed to the base or the leg T during an earthquake. Absorbs vertical and horizontal seismic energy.
2 '. A rubber-like elastic body 8D that surrounds the wire-shaped elastic body 4D and is provided between the base or leg T and the concrete foundation S works in the vertical and horizontal directions with respect to the base or leg T during an earthquake. Absorbs seismic energy.
In this way, vertical and horizontal seismic energy with respect to the building is absorbed, and the shaking of the building caused by the seismic energy is effectively suppressed.

<< Seismic isolation structure 2 >>
FIG. 5 is a vertical sectional view showing a seismic isolation structure of a second building similar to the seismic isolation structure shown in FIG. 4.
The seismic isolation structure of FIG. 5 differs from the seismic isolation structure of FIG. 4 in that a coiled elastic body 7E surrounding the upper bolt portion 1Ea and a coiled elastic body storage groove Ta for storing the coiled elastic body 7E Or it is the point provided in the upper end part of the bolt hole drilled in the leg part T.

That is, in FIG. 5, 1E is an anchor bolt made of a round steel having a diameter of 16 mm, and the lower bolt portion 1Eb is embedded in the concrete foundation S. On the other hand, the upper bolt portion 1Ea of the anchor bolt 1E is formed in the bolt hole formed in the base or the leg portion T, and a part or all of the tightening screw portion 1Ec formed on the upper end thereof is on the base or the leg portion T. The washer 3Ea and the tightening nut 2E are attached to the protruding portion.
The anchor bolt 1E is also connected to the upper bolt portion 1Ea and the lower bolt portion 1Eb by a wire-like elastic body 4E inserted into and crimped to the respective end surface recesses.

The coiled elastic body receiving groove Ta provided at the upper end of the bolt hole drilled in the base or the leg T is coiled elastically so as to be tightened from above with a tightening nut 2E and a holding washer 3E. The body 7E is housed, and the coiled elastic body receiving groove 3E ′ for reinforcing the coiled elastic body receiving groove Ta and the base or leg T receiving the pressing force of the coiled elastic body 7E and the washer 3E is housed in the coil. It is provided over the inner surface of the groove Tb and the upper surface of the base or leg T.
A plate-like rubber-like elastic body 8E is arranged around the wire-like elastic body 4E exposed between the upper bolt portion 1Ea and the lower bolt portion 1Eb.

Such a seismic isolation structure is constructed as follows.
1. The lower bolt portion 1Eb of the anchor bolt 1E is embedded in the concrete foundation S with the upper bolt portion 1Ea of the anchor bolt 1E and a part of the wire 4E exposed.
2. The exposed upper bolt portion 1Ea is passed through the hole formed in the plate-like rubber-like elastic body 8E, and the plate-like rubber-like elastic body 8E is placed on the concrete foundation S.
3. A coiled elastic body accommodation groove Ta shallower than the height of the coiled elastic body 7E before tightening is processed and formed around the upper end portion of the base or the bolt hole of the leg portion T through which the upper bolt portion 1Ea passes.
4). The exposed upper bolt part 1Ea is passed through the bolt hole of the base or leg T, and the base or leg T is placed on the plate-like rubber-like elastic body 8E.
5. The coiled elastic body receiving reinforcement washer 3E ′ is placed over the inner surface of the coiled elastic body housing groove Tb and the upper surface of the base or leg T.
6). After the coiled elastic body 7E and the presser washer 3E are sequentially inserted into the upper bolt portion 1Ea protruding into the coiled elastic body storage groove Tb, the upper surface of the coiled elastic body receiving reinforcement washer 3E ′ and the presser washer 3E are inserted. The tightening nut 2E screwed into the tightening screw portion 1Ec of the upper bolt portion 1Ea is tightened to press the coiled elastic body 7E so that the upper surface of the upper end of the upper end portion is aligned on the same plane.

The seismic isolation structure constructed by such construction can absorb the seismic energy as follows.
1 '. The coiled elastic body support reinforcing washer 3E ′, the coiled elastic body 7E, the presser washer 3E, and the wire elastic body 4E tightened by the tightening nut 2E are vertically and horizontally with respect to the base or the leg T during an earthquake. Absorbs seismic energy acting in the direction.
2. A plate-like rubber-like elastic body 8E that surrounds the wire-shaped elastic body 4E and is provided between the base or leg T and the concrete foundation S is perpendicular and horizontal to the base or leg T during an earthquake. Absorbs seismic energy acting in the direction.
In this way, the vertical and horizontal seismic energy with respect to the building is absorbed, and the shaking of the building caused by the seismic energy is effectively suppressed.

<Seismic isolation mechanism 3>
FIG. 6 is a vertical sectional view of a base isolation structure similar to the base isolation structure shown in FIGS. 4 and 5, in which the coiled elastic body surrounding the anchor bolt is not in the base or the leg T, The point provided above differs from the seismic isolation structure of FIGS. 4 and 5.

  In FIG. 6, the lower bolt portion 1Fb of the anchor bolt 1F made of round steel having a diameter of 16 mm is embedded in the concrete foundation S. On the other hand, the tip of the tightening screw portion 1Fc of the upper bolt portion 1Fa of the anchor bolt 1F is projected on the base or leg T, and the upper bolt portion 1Fa is inserted into the base or leg T.

  Also in this anchor bolt 1F, the upper bolt portion 1Fa and the lower bolt portion 1Fb are, for example, a wire-like elastic body 4F as described above, in which the upper portion and the lower portion are respectively crimped to the upper bolt portion 1Ea and the lower bolt portion 1Eb. Are connected through.

  A coiled elastic body 7F is provided between the press washer 3F and the receiving washer 3F ′ so as to surround the tightening screw portion 1Fc in the tightening screw portion 1Fc protruding on the base or the leg T. On the presser washer 3F, a nut 2F for pressing the presser washer 3F to fasten the coiled elastic body 7F is screwed into the tightening screw portion 1Fc. Around the wire-like elastic body 4F exposed between the upper bolt portion 1Fa and the lower bolt portion 1Fb, an earthquake-resistant rubber 8F is disposed.

Such a seismic isolation structure is constructed as follows.
1. The lower bolt part 1Fb of the anchor bolt 1F is embedded in the concrete foundation S with the upper bolt part 1Fa of the anchor bolt 1F and a part of the wire-like elastic body 4E exposed.
2. The exposed upper bolt portion 1Fa is passed through a hole formed in the plate-like rubber-like elastic body 8F, and the plate-like rubber-like elastic body 8F is placed on the concrete foundation S.
3. The exposed upper bolt portion 1Fa is passed through a bolt hole drilled in the base or leg T, and the base or leg T is placed on the rubber-like elastic body 8F.
4). After the receiving washer 3F ′, the coiled elastic body 7F, and the holding washer 3F are passed through the tightening screw portion 1Fc of the upper bolt portion 1Fa, the coiled elastic body is tightened by the tightening nut 2F screwed to the tightening screw portion 1Fc. 7F and presser washer 3F are received and tightened against washer 3F ′.

According to the seismic isolation structure provided by such construction, it is possible to absorb the seismic energy as follows.
1 '. An earthquake in which the receiving washer 3F ′, the coiled elastic body 7F, the holding washer 3F, and the wire elastic body 4F, which are respectively clamped by the tightening nut 2F, work in the vertical and horizontal directions with respect to the base or leg T during an earthquake. Absorb energy.
2 '. A rubber-like elastic body 8F that surrounds the wire-shaped elastic body 4F and is provided between the base or leg T and the concrete foundation S works in the vertical and horizontal directions with respect to the base or leg T during an earthquake. Absorbs seismic energy.
In this way, the vertical and horizontal seismic energy with respect to the building is absorbed, and the shaking of the building caused by the seismic energy is effectively suppressed.

<Seismic isolation structure 4>
7 is a long groove recessed in a solid foundation of a building, and a base or a leg part whose outer periphery is cut is inserted, and the lower part of a plurality of seismic isolation anchor bolts shown in FIG. 5 is a solid foundation of the building A long groove recessed in the solid foundation of the building and the side wall space of the outer edge of the base or leg is filled with elastic resin such as rubber, urethane, silicone resin, etc. It is a vertical sectional view of a seismic isolation structure.
In the seismic isolation structure of FIG. 7, a base or leg T ′ whose outer periphery is cut into a long groove recessed in the solid foundation S ′ is inserted, and the lower bolt portion 1b is embedded in the solid foundation S ′. A plurality of seismic isolation anchor bolts 1 are connected to the solid foundation S ′, and then a rubber, urethane, silicone resin or the like is placed in a space V between the inner surface of the long groove and the side surface of the base or leg portion T ′. It is constructed by filling the elastic resin U. In addition, it is also preferable to prevent the entry of foreign matter and rainwater from the outside by filling the coiled elastic body housing groove Ta with an elastic resin such as urethane or silicone resin.
The procedure for joining the foundation S ′ and the base or leg T ′ with the seismic isolation anchor bolt 1 and the effect of seismic energy absorption by the seismic isolation structure are as described in << Seismic isolation structure 2 >> Detailed description will be omitted.
An elastic resin U such as rubber, urethane, or silicon resin filled in the space V between the inner wall surface of the solid foundation S ′ and the side of the base or leg portion T ′ that has been trimmed also helps absorb earthquake energy. Needless to say.

  In this embodiment, the example using the seismic isolation structure shown in FIG. 5 has been described. However, the present invention is not limited to this, and the use of the seismic isolation structure having the structure shown in FIG. 4 or 6 is also possible.

Side view of the seismic isolation anchor bolt according to Reference Example Other side view of seismic isolation anchor bolt by reference example Side view of the actual施例seismic isolation anchor bolt according to the invention 2 is a vertical cross section showing a seismic isolation structure of a building using the seismic isolation anchor bolt shown in FIG. 2 in a portion between the foundation of the building and a base or a leg together with a plate-like rubber-like elastic body surrounding the anchor bolt. Figure Vertical sectional view of the base isolation structure similar to the base isolation structure shown in FIG. Vertical sectional view of the base isolation structure similar to the base isolation structure shown in FIGS. A long groove recessed in a solid foundation of a building is inserted with a base or a leg portion whose outer periphery is cut, and a plurality of seismic isolation anchor bolts, a plate-like rubber-like elastic body and a building shown in FIG. Vertical cross-sectional view of a seismic isolation structure in which a long groove recessed in a solid foundation and a side wall space at the outer periphery of the base or leg are filled with elastic resin such as rubber, urethane, silicone resin, etc. Side view showing an example of a conventional anchor bolt

Explanation of symbols

1, 1A, 1B, 1C, 1D, 1E, 1F: Anchor bolt 1a, 1Aa, 1Ba, 1Ca, 1Da, 1Ea, 1Fa: Upper bolt part 1b, 1Ab, 1Bb, 1Cb, 1Db, 1Eb, 1Fb: Lower bolt part 1c, 1Ac, 1Bc, 1Cc, 1Dc, 1Ec, 1Fc: Tightening screw part 2, 2A, 2B, 2C, 2D, 2E, 2F: Tightening nut 3, 3B, 3Ba, 3D, 3Da, 3E, 3F, 33 : Pressing washer 3B'3D ', 3F': Receiving washer 3E ': Coiled elastic body receiving reinforcement washer 4, 4A, 4B, 4C, 4D, 4E, 4F: Wire elastic body 4Ba: Upper part of wire elastic body 4Bb : Lower part of wire-like elastic body 4Ba ', 4Bb': Male thread part of wire-like elastic body 5Aa, 5Ba: Recessed part 5Aa ', 5Ba': Female thread of recessed part 7A, 7B, 7D, 7E, 7F: Coiled elastic body 8D, 8E, 8F: Plate-like rubber-like elastic body S: Foundation S ': Solid foundation T: Foundation or leg T': Foundation or leg with outer periphery trimmed Ta: Coiled elastic body Storage groove U: Elastic resin such as rubber, urethane, silicone resin, etc. V: Side wall space of the long groove recessed in the solid foundation and the edge cutting part of the base or leg

Claims (6)

A seismic isolation anchor bolt that absorbs vertical and horizontal seismic energy generated during an earthquake and suppresses shaking that occurs in a building, and a high-strength elastic body for absorbing the seismic energy is a middle part of the anchor bolt And a lower portion, the high-strength elastic body is composed of a wire-like elastic body in which a number of steel wires or reinforced resin wires bundled with a number of steel wires or reinforced resin wires are twisted together, and seismic isolation anchor bolt, characterized in that the lower part of the wire-like elastic body which is embedded in the concrete foundation is formed by Awa twisted at the upper part to be configured in a ring-shaped former.   The seismic isolation anchor bolt according to claim 1, wherein the wire-like elastic body is a PC steel strand.   The upper part of the wire-shaped metal or reinforced resin elastic body is joined to the upper bolt part by being crimped to the upper bolt part fastened and fixed to the base or leg of the building. The seismic isolation anchor bolt according to claim 1 or 2.   A base isolation structure for a building, wherein a lower part of the base isolation anchor bolt according to any one of claims 1 to 3 is embedded in a foundation of the building.   The lower part of the seismic isolation anchor bolt according to any one of claims 1 to 3, wherein a base or a leg portion is inserted by cutting the outer periphery into a long groove recessed in a solid foundation of a building. A seismic isolation structure for buildings, which is embedded in a solid foundation of buildings.   The long groove recessed in the solid foundation of the building and the side wall space of the base or the outer peripheral edge of the leg are filled with an elastic resin such as rubber, urethane, silicon resin or the like. 5. Seismic isolation structure for buildings according to 5.

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