JP2001311164A - Ground anchor vibration isolation structure and vibration isolation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground anchor vibration isolation structure and a vibration isolation method capable of sufficiently retaining the vibration isolation function even if an excessive large overturning moment acts on a building. SOLUTION: There is provided the ground anchor vibration isolation structure constituted of a foundation structure 2, an upper building 7 rockably supported on the foundation structure 2, a rubber vibration proof members 4, 10 arranged between the foundation structure 2 and the upper building 7, and a ground anchor 12 connected to the upper building 7 and the vibration isolation method connecting the ground anchor 12 to the upper building 7 rockably supported by the rubber vibration proof member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic retrofit of a building, and more particularly to a seismic isolation structure and a seismic isolation method using a rubber anti-vibration member and a permanent ground anchor.

[0002]

2. Description of the Related Art A method of providing a permanent ground anchor (hereinafter referred to as a ground anchor) at a lower portion of a building includes a PTC method, in order to prevent the building from overturning due to seismic force or storm, and to provide groundwater. It is used for the purpose of preventing floating of a building received from a water pressure, etc., and it is expected that the demand will be further increased in the future.

FIG. 7 is a diagram schematically showing a conventional building reinforced with a ground anchor. The building 70 shown in FIG. 7 has a lower structure built in the ground 71 having good structure, and a wire 72 and the like connected to the lower structure and a wire 72 connected to the wire 72 and held on the good ground 71. Ground anchor 7 composed of
4. The ground anchor 74 holds the building 70 firmly against the good ground 71, and the overturning moment generated by the force applied to the building 70 from, for example, the direction of arrow A during an earthquake or storm. Used to counteract

[0004] FIG. 8 schematically shows a conventional building in which a ground anchor is used to counter buoyancy applied to the building by groundwater. The building 80 shown in FIG.
Is constructed at a position where the lower structure is deeper than the groundwater level GWL in the favorable ground 81. Therefore, it is necessary for the building 80 to suppress the influence of the steady buoyancy and the influence caused by the fluctuation of the groundwater level GWL.
For this reason, the wire 82 is provided in the lower structure of the building 80,
A ground anchor 84 composed of an anchor body 83 connected to the other end by a wire 82 and held on a good ground 81 is connected. The building 80 is exposed to the ground anchor 8 against the buoyancy indicated by arrow B added by the groundwater.
4 to counteract the effects of constantly applied buoyancy.

As shown in FIGS. 7 and 8, ground anchors are often used to adjust the overturning moment and buoyancy applied to a building. On the other hand, conventionally, as a seismic isolation mechanism for a building, a structure using a rubber vibration isolating member such as a laminated rubber or a high-damping laminated rubber is known.

FIG. 9 shows a seismic isolation structure constructed by the above-described seismic isolation construction method. In this seismic isolation structure, good ground 9
A plurality of pedestals 92 are provided on a base structure 91 formed by excavating and casting concrete, and a high-damping laminated rubber 93 is disposed on the pedestal 92. The support part 94 is attached to. A beam, a floor slab 95, and the like are bridged in the support portion 94 in the horizontal direction, and an upper building 96 is constructed above the beam, the floor slab 95, and the like. Further, the seismic isolation structure shown in FIG. 9 is constructed from the base structure 91, and the opposing support structures 97a, 97
A damper 98 is shown between 7b.

The damper 98 is used in combination with the laminated rubber 93a to add damping to the laminated rubber 93a. The seismic isolation structure shown in FIG. 9 is configured to extend the natural period of the upper building 96 during an earthquake, and to absorb energy applied to the upper building 96 due to the earthquake. The damper 98 can be appropriately selected from a viscoelastic damper, a steel damper, and a friction damper. The above-mentioned damper 98 is used according to the necessity of the laminated rubber 93a, and is not necessarily used.

[0008] In recent years, a building that adopts the seismic isolation structure shown in FIG. 9 due to an increase in height of the building tends to generate a large overturning moment due to an earthquake or the like. Due to the overturning moment, an excessive force in the pull-out direction is applied from the upper structure 96 to the laminated rubber 93a used as the rubber vibration isolating member or the high-damping laminated rubber 93, so that sufficient seismic isolation is performed in the case of a large earthquake or the like. In some cases, the function cannot be exhibited. In such cases, the adoption of seismic isolation structures has been postponed.

Therefore, there has been a need for a ground anchor seismic isolation structure and a seismic isolation method capable of sufficiently maintaining a seismic isolation function even when an excessive overturning moment is applied to a building.

In addition, even when a large overturning moment is applied to a building, it is possible to sufficiently maintain the seismic isolation function, and to further use a rubber vibration isolating member such as a laminated rubber or a high damping laminated rubber. There is a need for a ground anchor seismic isolation structure and seismic isolation method that can be applied without major changes to the seismic isolation mechanism.

Furthermore, since the overturning moment is expected to be large, the use of the laminated rubber is effective even for buildings where it was impossible to apply the seismic isolation mechanism using the laminated rubber or the like. There is a need for a ground anchor seismic isolation structure and seismic isolation method that can provide seismic isolation to a building.

[0012]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the present invention provides a seismic isolation device that is sufficiently seismically isolated even when an overturning moment is applied to a building. The purpose is to provide a ground anchor seismic isolation structure and seismic isolation method that can maintain the function.

Further, the present invention can sufficiently maintain the seismic isolation function even when a large overturning moment is applied to a building, and furthermore, rubber vibration isolation such as laminated rubber and high damping laminated rubber. It is an object of the present invention to provide a ground anchor seismic isolation structure that can be applied without largely changing a conventional seismic isolation mechanism using members.

Further, the present invention is also applicable to a building in which it has been conventionally impossible to apply a seismic isolation mechanism using a rubber vibration isolating member, since the overturning moment is expected to be large. It is an object of the present invention to provide a ground anchor seismic isolation structure and a seismic isolation method that can effectively impart seismic isolation using a vibration isolating member.

[0015]

The above objects of the present invention are attained by providing a ground anchor seismic isolation structure and a seismic isolation method of the present invention.

That is, according to the first aspect of the present invention, a foundation structure, an upper building swingably supported with respect to the foundation structure, and a space between the foundation structure and the upper building. And a ground anchor connected to the lower structure of the upper building.

According to the invention of claim 2 of the present invention, there is provided a ground anchor seismic isolation structure, wherein the rubber vibration isolating member is selected from laminated rubber and high damping laminated rubber.

According to the invention of claim 3 of the present invention, the ground anchor comprises: an anchor body fixed to a good ground;
A ground anchor seismic isolation structure is provided, comprising one end connected to the anchor body and the other end connected to a lower structure of the upper building.

According to a fourth aspect of the present invention, there is provided a ground anchor seismic isolation structure, wherein the ground anchor has a tension adjusting function.

According to a fifth aspect of the present invention, there is provided a ground anchor seismic isolation structure, wherein the laminated rubber is supported by a viscoelastic damper, a steel damper, or a friction damper.

According to the invention of claim 6 of the present invention, the ground anchor is attached to the upper building swingably supported by the base structure via the rubber vibration isolating member, and the upper building swings. There is provided a seismic isolation method characterized by being connected as much as possible.

According to the seventh aspect of the present invention, the ground anchor includes an anchor body fixed to the ground, one end connected to the anchor body, and the other end connected to the lower structure of the upper building. A seismic isolation method is provided, comprising:

According to an eighth aspect of the present invention, there is provided a seismic isolation method wherein the rubber vibration isolating member is selected from a laminated rubber and a high damping laminated rubber.

According to the ninth aspect of the present invention, there is provided a seismic isolation method, wherein the ground anchor has a tension adjusting function.

According to a tenth aspect of the present invention, there is provided a seismic isolation method wherein the laminated rubber is supported by a viscoelastic damper, a steel damper, or a friction damper.

[0026]

According to the present invention, in order to reduce or prevent the pull-out force acting on the rubber vibration isolating member, the ground anchor connected to the upper building is buried in the ground through the base isolation structure. A more reliable seismic isolation is obtained. Furthermore, since the upper building is supported so as to be able to swing even when the ground anchor is connected, the seismic isolation function of the rubber vibration isolating member can be ensured. Accordingly, it is possible to prevent the pull-out force of the rubber vibration isolating member from being zero or a predetermined pull-out force or more.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows a schematic view of the ground anchor seismic isolation structure of the present invention. The ground anchor seismic isolation structure of the present invention is substantially similar to the conventional seismic isolation structure shown in FIG.
A plurality of bases 3 are provided on a base structure 2 formed by excavating and casting concrete, and a high damping laminated rubber 4 used as a rubber vibration isolating member is arranged on the bases 3. The support portion 5 is mounted on the high attenuation laminated rubber 4. The foundation structure 2 that can be used in the present invention is a pressure-resistant board or footing constructed by excavating good ground 1 and casting concrete, and is supported by a pile when the ground is bad. It is also possible to use underground continuous walls.

A beam, a floor slab 6 and the like are bridged in the support portion 5 in the horizontal direction, and an upper building 7 is constructed above the beam and the floor slab 6 and the like forming a lower structure of the upper structure. Have been. The ground anchor seismic isolation structure shown in FIG.
Opposing support structures 8a, 8 constructed from the base structure 2
It is shown that the damper 9 is arranged between the positions b.
This damper 9 is used in combination with a laminated rubber 10 which is a rubber vibration isolating member that can be used together with the high-damping laminated rubber 4, and adds a damping property to the laminated rubber 10. Further, it is also possible to use only the high attenuation laminated rubber 4 as the rubber vibration isolating member, and in this case, the damper 9 does not necessarily have to be used.

In the base anchor seismic isolation structure of the present invention shown in FIG. 1, a plurality of openings 11a are provided in the beam or slab 6 for supporting the upper building 7, and the openings 11a and the foundation are provided. A wire 12a used as a connection member for the ground anchor 12 is shown to extend through the opening 11b of the structure 2. As a connecting member, in addition to wires, if it is a material having a strength enough to appropriately resist addition from a building, carbon fiber,
Aramid, Kevlar, various composite materials and the like can be used.

The distal end of the wire 12a has an anchor 1
2b are connected to each other, and the anchor body 12b is held on a favorable ground 1 where liquefaction does not occur. Further, the wire 12a of the favorable ground 1 is connected to and supported by a fixing member 14 having a diameter larger than the diameter of the opening 11a placed on the beam or the floor slab 6 supporting the upper building 7.

The diameter of the opening 11a is larger than the diameter of the wire 12a of the ground anchor 12, so that the upper building 7 on the ground anchor seismic isolation structure can swing in the event of an earthquake. In addition, a sufficient clearance is formed. Further, the contact portion between the beam or floor slab 6 and the fixing member 14 can be fixed,
It is also possible to support the sliding between the fixing member 14 and the beam or floor slab 6. In addition, the opening 11a may be filled with a filler 13 such as synthetic rubber, natural rubber, or various resin materials for flexibly supporting the wire 12a.

An opening 11b is provided in the base structure 2, and a wire 12a of the ground anchor 12 is inserted through the opening 11b to sufficiently transmit the restraining force of the anchor body 12b to the upper building 7. Let me.

The opening 11b is made of mortar, cement, grout,
It can be filled with various resin materials such as natural rubber, synthetic rubber, and polytetrafluoroethylene. The opening 11b is made of a wire 12a using another appropriate material.
May be inserted.

The ground anchor seismic isolation structure of the present invention uses the wire 12a of the ground anchor 12 to the upper building 7,
It is possible to effectively use the entire length of the wire 12a to counter the falling moment. For this reason, it is possible to provide a seismic isolation structure even for a building where the application of the seismic isolation structure was not possible until now. Further, compared to the case where the upper structure 7 and the foundation structure 2 are directly joined by using the direct pullout resistance member, the joint of the foundation structure 2 does not break due to the swinging of the upper structure 7, and It is possible to more effectively prevent the possibility of damage to a building such as a decrease in seismic isolation due to joint destruction and a subsequent rapid decrease in binding force, and a fall or collapse of an upper building.

Further, the ground anchor 12 that can be used in the present invention can be provided with a tension adjusting mechanism for adjusting the restraining force applied by the ground anchor 12. FIG. 2 is a diagram showing in detail a tension adjusting mechanism that can be arranged between the beam or floor slab 6 and the foundation structure 2 in the ground anchor seismic isolation structure of the present invention.

The tension adjusting mechanism 15 shown in FIG. 2 has a male fitting 15a having a wire 12a connected to one end and a screw provided at the other end, and a screw threaded to a screw provided at the male fitting 15a at both ends. And a female metal fitting 15b provided at the bottom. The tension adjusting mechanism 15 shown in FIG. 2 extends upward from the male fitting 15 a fixed to the distal end of the wire 12 a suspended from the upper building 7 and the anchor body 12 b and passes through the foundation structure 2. The male fitting 15a connected to the tip of the wire 12a is screwed together via a female fitting 15b.

With the above-described configuration, the restraining force applied from the anchor body 12b to the beam or floor slab 6 as the lower structure can be adjusted within a predetermined range. By using the tension adjusting mechanism 15 in this manner, the ground anchor 12 to be added to the beam or the floor slab 6 can be used.
From the floor or the floor slab 6 can be made uniform.

The tension adjusting member 15 allows the upper building 7 to move in the lateral direction by the seismic isolation mechanism in the event of an earthquake, and the high damping laminated rubber 4 or the laminated rubber In order to prevent excessive compressive force from being applied to 10, it is also possible to provide a configuration in which a margin is provided for the tension in normal times.

It is also possible to provide the tension adjusting mechanism 15 to a portion constituted by using the fixing member 14 as shown in FIG. FIG. 3 is a sectional view showing a modification of the tension adjusting mechanism 15 used in the present invention. The tension adjusting mechanism 15 shown in FIG. 3 includes a fixing member 14, an adjusting fitting 14b through which the wire 12a is inserted and firmly fixing the wire 12a, and a bolt 14c screwed to the adjusting fitting 14b. It is configured. The fixing member 14 is fixed or slidably mounted on the beam or the floor slab 6 of the upper building 7. At the center of the fixing member 14, an opening 14a provided with a screw is formed. An adjusting fitting 14b is screwed into the opening 14a, and the adjusting fitting 14b is screwed into the lower structure of the upper building 7 through the adjusting fitting 14b. Supported.

The wire 12a is passed through the opening 11a and extends through the base structure 2 to the anchor body 12b. The adjustment fitting 14b is locked to the beam or the floor slab 6 of the upper building 7 by the tightening force of the bolt 14c, so that a predetermined restraining force can be applied to the upper building 7 and the adjustment fitting 14b can be adjusted. The tension can be adjusted according to the penetration depth of the metal fitting 14b.

FIG. 4 is a view showing a second embodiment of the ground anchor seismic isolation structure of the present invention. In the second embodiment of the ground anchor seismic isolation structure of the present invention, the ground anchor 12
Of the high-damping laminated rubber 4 or the laminated rubber 10
1 is different from the first embodiment shown in FIG. 1 in the point that it is inserted inside, but the other points have the same configuration.

FIG. 5 shows a second embodiment of the present invention.
FIG. 3 is a diagram showing in detail a laminated rubber 10 in which a wire 12a is inserted. The wire 12 a passes through an opening 11 a provided in the beam or floor slab 6 and an opening formed in the support 5. The laminated rubber 10 is sandwiched between the base 3 and the support 5 while being compressed via the end members 16a and 16b.

End members 16a, 16b and laminated rubber 10
Are provided with openings 10a at least enough to allow the wires 12a to pass therethrough, and the upper end of the wire 1 is fixed by fixing members 14 and 14c.
2a is extended to an anchor body (not shown) through the opening 11a. The ground anchor seismic isolation structure shown in FIG. 5 can improve the restraining force especially in the vicinity of the laminated rubber 10 which has an adverse effect when a pull-out force is generated, so that the seismic isolation of the building is more effectively improved. It becomes possible. Further, the tension adjusting function described with reference to FIG. 3 can be used in the second embodiment of the present invention.

Hereinafter, the operation of the present invention will be described in detail with reference to FIG. When a horizontal force indicated by an arrow C is applied to the ground anchor seismic isolation structure of the present invention by an earthquake, the upper structure 7 is connected to the foundation structure 2 via the ground anchor seismic isolation structure. , A falling moment M _fall is applied. This overturning moment M _{fa
When ll} is added, the high damping laminated rubber 4
In addition, a pulling force is applied to the laminated rubber 10.

Even when such a pull-out force is applied, since the ground anchor seismic isolation structure of the present invention is restrained by the ground anchor 12, the rubber vibration isolator such as the high damping laminated rubber 4 or the laminated rubber 10 is provided. The member can be made to have no withdrawal force, or not be given a withdrawal force of a predetermined value or more. In FIG. 6, the magnitude of the tension applied to the wire 12a of the ground anchor 12 at this time is indicated by F ₁ , F ₂ , and F ₃ . As shown in FIG. 6, the tension applied to the wire 12a corresponding to the overturning moment during the earthquake applied in the direction of arrow C is:
F _{1 to} F ₃ indicate the pull-out force acting on the high-damping rubber 4 and the laminated rubber 10.

As a result, no excessive pulling force acts on the high damping laminated rubber 4 and the laminated rubber 10 which are rubber vibration isolating members, and it is possible to maintain good seismic isolation. Also,
The opening 11a provided between the beam or the floor slab 6 is
Since it is formed so as to accommodate the wire 12a of the ground anchor 12 and to provide more sufficient clearance,
The swing of the upper building 7 can be performed smoothly, and the seismic isolation function of the ground anchor seismic isolation structure is not hindered.

Although the present invention has been described in detail with reference to the drawings, the present invention is not limited to the embodiments shown in the drawings, but includes dimensions, shapes, materials, the number of installations, Any installation procedure and the like can be used as long as they have the functions and effects of the present invention.

[0049]

According to the present invention, it is possible to provide a ground anchor seismic isolation structure capable of sufficiently maintaining the seismic isolation function even when an excessive overturning moment is applied to a building.

Further, according to the present invention, even when a large overturning moment is applied to the building, the seismic isolation function can be sufficiently maintained, and the conventional seismic isolation mechanism using laminated rubber or the like can be obtained. It is possible to provide a ground anchor seismic isolation structure that can be applied without greatly changing the structure.

Furthermore, according to the present invention, since the overturning moment is expected to be large, even for a building where it was impossible to apply a seismic isolation mechanism using laminated rubber or the like, It is possible to provide a ground anchor seismic isolation structure that can effectively impart seismic isolation using laminated rubber.

[Brief description of the drawings]

FIG. 1 is a diagram showing a ground anchor seismic isolation structure according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a tension adjusting mechanism that can be used in the present invention.

FIG. 3 is a diagram showing a modified example of a tension adjusting mechanism that can be used in the present invention.

FIG. 4 is a schematic diagram showing a ground anchor seismic isolation structure according to a second embodiment of the present invention.

FIG. 5 is a detailed view showing a ground anchor seismic isolation structure according to a second embodiment of the present invention.

FIG. 6 is a diagram showing generated stress and external force of the present invention at the time of the earthquake of the present invention.

FIG. 7 is a view showing a conventional building using a ground anchor.

FIG. 8 is a view showing a conventional building using a ground anchor.

FIG. 9 is a diagram showing a conventional seismic isolation structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Good ground 2 ... Foundation structure 3 ... Base part 4 ... High damping laminated rubber 5 ... Support part 6 ... Beam or floor slab 7 ... Upper building 8a, 8b ... Support structure 9 ... Damper 10 ... Laminated rubber 10a ... Opening 11a, 11b Opening 12 Ground anchor 12a Wire 12b Anchor body 13 Filler 14 Fixing member 14a Opening 14b Adjustment fitting 14c Bolt 15 Tension adjustment mechanism 15a Male fitting 15b Female fitting 16a , 16b ... end member G. L: Ground surface GWL: Groundwater level M _fall : Falling moment 70: Building 71: Good ground 72: Wire 73: Anchor body 74: Ground anchor 80: Building 81: Good ground 82: Wire 83: Anchor body 84 ... ground anchor 90 ... good ground 91 ... foundation structure 92 ... base 93 ... high damping laminated rubber 93a ... laminated rubber 94 ... support part 95 ... beam or floor slab 96 ... upper building 97a, 97b ... support structure 98 ... damper

Claims (10)

[Claims] 1. A base structure, an upper building swingably supported with respect to the base structure, a rubber vibration isolation member disposed between the base structure and the upper building, Ground anchor seismic isolation structure consisting of a ground anchor connected to the substructure of the building. 2. The base anchor seismic isolation structure according to claim 1, wherein the rubber vibration isolating member is selected from a laminated rubber and a high damping laminated rubber. 3. The ground anchor includes an anchor body fixed to the ground, and a connecting member having one end connected to the anchor body and the other end connected to a lower structure of the upper building. The ground anchor seismic isolation structure according to claim 1 or 2. 4. The ground anchor seismic isolation structure according to claim 1, wherein the ground anchor body has a tension adjusting function. 5. The seismic isolation structure according to claim 2, wherein the laminated rubber is supported by a viscoelastic damper, a steel damper, or a friction damper. 6. A ground anchor is connected to an upper building swingably supported on a foundation structure via a rubber vibration isolating member so that the upper building can swing. Seismic isolation method. 7. The ground anchor includes an anchor body fixed to the ground, and a connecting member having one end connected to the anchor body and the other end connected to a lower structure of the upper building. The seismic isolation method according to claim 6, wherein 8. The seismic isolation method according to claim 6, wherein the rubber vibration isolation member is selected from a laminated rubber and a high attenuation laminated rubber. 9. The ground anchor according to claim 6, wherein the ground anchor has a tension adjusting function.
The seismic isolation method described in (1). 10. The seismic isolation method according to claim 8, wherein the laminated rubber is supported by a viscoelastic damper, a steel damper, or a friction damper.