JP2002201816A - Base isolation foundation structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation structure of a simple arrangement reducing the earthquake vibration of a building on a structure supporting bottom plate, while assuring safety against even the vibrations of large earthquakes. SOLUTION: An isolator 3 and a lead damper 4 are interposed between the structure supporting bottom plate or a structure supporting beam 1 and a foundation structure plate or a foundation structure beam 2 provided in the ground therebelow. Crushed stones and sediment are packed around the isolator and the lead damper. Preferably, steel pipes 6a and 6b are anchored to the upper edge of the foundation structure plate or the foundation structure beam 1 while surrounding the isolator 3 and the damper 4, with the upper end edges of the steel plates kept out of contact with the structure supporting bottom plate or the structure supporting beam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure for a building, and more particularly to a seismic isolation base structure for a building capable of obtaining high seismic isolation performance in a seismic isolation structure using both an isolator and a lead damper.

[0002]

2. Description of the Related Art In recent years,
In order to prevent the damage caused by the earthquake from increasing, seismic measures have been taken for buildings. The main seismic measures are rigidity in the vertical direction, high rigidity in the horizontal direction, and the use of a damper that damps vibration by supporting it with a long-period spring. To reduce the resonance of the ground and building shaking during an earthquake,
Seismic isolation structure with a rubber complex seismic isolation device between the building and the ground to extend the natural period of the building and absorb the energy of the earthquake by deformation of the rubber complex seismic isolation device Has been implemented. Examples of the rubber composite seismic isolation device in the seismic isolation structure include a device for fixing a seismic isolation spring, such as laminated rubber, between a foundation and a building to the building. The laminated rubber is configured by alternately stacking rubber and an iron plate. However, unexpected
There was a problem that a simple seismic isolation structure that could secure safety against excessive vibration was not developed.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and by maximizing the seismic isolation performance of an isolator and a lead damper, it is possible to protect against an unexpected or unexpected earthquake. The purpose of the present invention is to provide a base-isolated foundation structure for a building that exhibits a high seismic isolation effect. That is, the present invention is a base-isolated base structure of a building having the following configuration and a base-isolated building constructed on the base-isolated base structure. (1) An isolator and a lead damper are interposed between a structure support bottom plate or a structure support beam and a foundation structure plate or a foundation structure beam provided under the ground, and the isolator and the lead damper are further provided. The base isolation structure of a building characterized by being filled with crushed stone or earth and sand. (2) An isolator and a lead damper are interposed between a structure supporting bottom plate or a structure supporting beam and a foundation structure plate or a foundation structure beam provided in the ground below the structure supporting bottom plate or the structure supporting beam. On the upper edge of the foundation structure beam, a steel pipe is fixed around the isolator and the lead damper at an upper edge thereof in a non-contact state with the structure support bottom plate or the structure support beam, respectively. A seismic isolation foundation for a building characterized by being filled with crushed stone or earth and sand on the outside. (3) An isolator and a lead damper are interposed between a structure supporting bottom plate or a structure supporting beam and a foundation structure plate or a foundation structure beam provided in the ground below the structure supporting bottom plate or the structure supporting beam. At the upper edge of the foundation structure beam, the steel pipe surrounds the isolator and the lead damper, and each upper end edge is fixed to the structure support bottom plate or the structure support beam in a non-contact state. Base isolation structure of building. (4) On the inner wall of the steel pipe surrounding the isolator,
The seismic isolation base structure for a building according to any one of the above (2) or (3), wherein an impact absorbing material for preventing horizontal movement of the isolator due to excessive vibration is attached. . (5) A retaining wall is erected on the outer peripheral edge of the foundation structure plate or the foundation structural beam, and between the inner wall surface of the retaining wall and the outer peripheral edge of the structure supporting bottom plate or the structural supporting beam. The seismic isolation base structure for a building according to any one of (1) to (4), wherein a clearance is provided at least equal to or more than an allowable horizontal movement distance of the structure support bottom plate. (6) A horizontal wall protrudes inward from an upper edge of the retaining wall, a notch step is provided at an upper portion near an outer peripheral portion of the foundation plate or the foundation structure beam, and an inner edge of the horizontal wall is provided. A clearance not less than the horizontal movement allowable distance of the structure support bottom plate or the structure support beam is provided between the notch step portion of the structure support bottom plate or the structure support beam. The base isolation structure of the building according to any one of (1) to (5). (7) In the ground below the foundation structure plate or foundation structure beam,
The concrete pile is provided, and an upper end portion of the concrete pile is in contact with or connected to a lower surface of the foundation structure plate or the foundation structure beam, according to any one of the above (1) to (6). Base isolation structure of the building described. (8) In the ground below the foundation structure plate or foundation structure beam,
A concrete pile is provided, and the lower surface of the foundation structure plate or the foundation structure beam and the upper end of the concrete pile are connected and fixed with connection bolts (1) to (1) to (1) to (1).
(6) The base isolation structure of a building according to any one of (1) and (2). (9) A through hole for inspection, which is opened on a side portion of an isolator or a lead damper, is formed in a part of the structure support bottom plate or the structure support beam, wherein
The base isolation structure of the structure according to any one of (8). (10) A base-isolated building, wherein a building is constructed on the base-isolated base structure described in any one of (1) to (9).

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings and examples. 1 and 3
FIG. 2 is an enlarged view of an embodiment of the base isolation structure of the building of the present invention, and FIGS. 2 and 4 are cross-sectional views of the embodiment of the base isolation structure of the building of the present invention. FIGS. 5, 6, and 7 are general views of an embodiment of a base seismic isolation structure of a building according to the present invention, and FIG. 8 is an explanatory diagram of a seismic isolation base structure of a building of the present invention. In the figure, 1
Is a building support bottom plate or a support beam, 2 is a foundation plate or a foundation beam, 3 is an isolator, 4 is a lead damper,
5 is crushed stone / sand, 6a and 6b are steel pipes, and 7 is a shock absorbing material. 8 is a retaining wall, 80 is an inner wall surface of the retaining wall, 81 is an upper edge of the retaining wall, 82 is a horizontal wall of the retaining wall, 9 is a clearance, 10 is an outer peripheral edge of the structural support bottom plate 1, Reference numeral 11 denotes a cutout step. And 12 is a concrete pile,
13 is a high-strength connection bolt, h is a horizontal movement allowable distance, and B is a building.

As shown in FIG. 1, the base isolation structure of a building according to the present invention comprises an isolator 3 and a lead between a structure support bottom plate 1 and a base structure plate 2 provided under the ground. A damper 4 is interposed therebetween, and the periphery of the isolator 3 and the lead damper 4 is filled with crushed stone or earth and sand 5. Further, steel pipes 6a, 6b are fixed on the upper surface of the base structure plate 2 so as to surround the isolator 3 and the lead damper 4, and upper end edges of the steel pipes 6a, 6a are not in contact with the structure support bottom plate 1. They are arranged in contact.

Here, the structure supporting bottom plate 1 is a foundation for directly supporting a structure such as a building B or the like. The foundation, which is a structural part provided to transfer the load from the pillars, walls, foundation, etc. of the building to the ground or earthwork, is broadly divided into foundation beams and foundation bottom plates, and the foundation beams By connecting the horizontal members, they bear the bending moment of the column base and the shearing force due to it, and by increasing the rigidity of this beam,
This prevents uneven settlement of the foundation and increases the rigidity of the entire building. The foundation bottom plate is a slab at the bottom of the foundation, and the foundation reaction force is applied upward. In the present invention, the structure supporting bottom plate 1 indicates the whole foundation including the foundation beam and the foundation bottom plate. The direct foundation method includes independent foundation, composite foundation,
There are cloth foundations, solid foundations, and the like. The seismic isolation foundation structure of the building of the present invention may be a solid foundation configured to receive the whole or most of the building with one foundation, or another cloth foundation. Or any foundation, such as an independent foundation,
It has a configuration that can be adopted.

In the present invention, the basic structure plate 2
Are provided in the ground below the structure supporting bottom plate 1. The seismic isolation base structure of a building according to the present invention is constituted by a double base including the structure support bottom plate 1 and the base structure plate 2. Similarly to the structure supporting bottom plate 1, the foundation structure plate 2 may be formed in a foundation bottom plate shape or a foundation beam shape, and its shape is selected according to the condition of the ground and the installation environment of the building. It is desirable to do. As shown in FIG.
It is preferable that a step is provided around the place where the isolator 3 and the lead damper 4 are interposed so as to make the work easier when the isolator 3 and the lead damper 4 are replaced and inspected.

In the present invention, the isolator 3 interposed between the structure supporting bottom plate 1 and the foundation structure plate 2 is a device or mechanism for insulating the building B from the ground. It is preferable that the isolator 3 has strength and rigidity capable of supporting the entire weight of the building B and has sufficiently soft characteristics in the horizontal direction. In particular, a thin rubber sheet and an intermediate steel sheet are alternately formed. A laminated rubber isolator that is laminated and has flanges above and below it is desirable. In addition, the laminated rubber isolator is equipped with load bearing capacity, large deformation performance, and restoring force performance that returns to the original position at the end of an earthquake, and is composed of natural rubber-based laminated rubber, high-damping laminated rubber, and lead plug. Laminated rubber and the like. The natural rubber-based laminated rubber is a laminated rubber using natural rubber which is excellent in tensile strength, elongation and creep resistance and has little change in physical properties due to temperature change. The load deformation characteristic is characterized by having a stable spring characteristic from a small deformation to a large deformation with little dependence on the fluctuation of the axial force and the displacement history. The high-damping type laminated rubber is a laminated rubber that uses a specially formulated rubber as a rubber material to increase the viscosity of the rubber material and also absorb energy by itself. The shape of the laminated rubber is the same as that of the natural rubber-based laminated rubber. The laminated rubber containing lead plugs is obtained by press-fitting lead into a cylindrical hollow hole provided at the center of a natural rubber-based laminated rubber. This is a laminated rubber with a built-in damper that absorbs energy by plastic deformation of the internal lead plug when the laminated rubber is sheared. In the base isolation structure of a building according to the present invention, the isolator 3 used may be any of these laminated rubber isolators, and may be appropriately selected according to the weight, shape, and location of the building. , Can be used.

In the present invention, the damper 4 interposed between the structural support bottom plate 1 and the foundation structure plate 2 imparts damping performance to the seismic isolation structure by energy consumption during vibration, and This has an effect of suppressing an excessive relative displacement between the upper structure (the structure support bottom plate 1 and the building B) and the ground. The damper generally includes a steel damper, a friction damper, a lead damper, and the like. In the present invention, a lead damper having high purity lead having excellent repetitive plastic deformation ability in a large deformation range is used. Lead has the property that defects in the crystal lattice caused by plastic deformation are eliminated by recrystallization at room temperature, and has the most ductile properties. Of course, it is possible to use steel dampers or friction dampers instead of lead dampers,
In the base isolation structure of a building according to the present invention, a lead damper that can obtain the highest damping performance is preferable.

Further, as shown in FIG. 7 which is an overall view of an example of the base seismic isolation structure of a building of the present invention, a concrete pile 12 is It is also preferable to connect and fix with high strength connection bolts 13. Concrete piles to be buried at this time include pre-stressed prestressed concrete piles (PCs), such as centrifugal reinforced concrete piles (RC piles) and prestressed steel pipes that are prestressed in the pile axis direction to prevent cracking and damage.
Piles), pre-tension type centrifugal high-strength prestressed concrete piles (PHC piles), which can be used to increase the scale of buildings and lengths in soft ground, and can be used to increase the load on the bearing capacity per piece. Concrete piles with outer shell steel pipes (SC piles) that combine the compressive properties of concrete and the tensile properties and toughness of steel pipe piles that can be applied to soft ground and ground where liquefaction is expected. The concrete pile is desirably selected in consideration of a load condition, a ground condition, and a construction condition of a construction site.

Further, in the present invention, crushed stone or earth and sand 5 is filled around the isolator 3 and the lead damper 4.
By interposing, even if the isolator 3 and the lead damper 4 are destroyed in the event of a large earthquake, the crushed stones 5 support and support the structure supporting bottom plate 1, which is safe. In addition, the movement (rolling) in the vertical direction is reduced due to the presence of the crushed stones 5. On the upper surface of the foundation structure plate or foundation structure beam 2, steel pipes 6a and 6b surround the isolator 3 and the lead damper 4, respectively.
The upper edge is fixed to the structure support bottom plate or the structure support beam 1 in a non-contact state. Due to the presence of the steel pipes 6a and 6b, crushed stones 5 and the like filled around them are prevented from penetrating around the isolator 3 and the lead damper 4 and coming into direct contact with each other, thereby inhibiting their functions. .
Also, as shown in FIG. 8, when a large earthquake causes a roll due to excessive vibration, the isolator attachment 3A on the isolator 3 comes into contact with the inner peripheral surface of the steel pipe to prevent further movement. At this time, it is preferable that the viscoelastic shock absorbing material 7 is adhered to the inner peripheral surface of the steel pipe, so that even if the isolator mounting tool 3A hits, the roll is slowly absorbed without sudden rebound. It will be.

It is preferable that a retaining wall 8 is provided upright on the outer peripheral edge of the foundation structure plate or the foundation structure beam 2. However, between the inner wall surface 80 of the retaining wall 8 and the outer peripheral edge 10 of the structure support bottom plate or the structure support beam 2, the clearance 9 having at least the horizontal movement allowable distance h of the structure support bottom plate 1 is provided. Must be provided. Further, a horizontal wall 82 protrudes inward from an upper edge 81 of the retaining wall 8, and a notch step 11 is formed on an upper outer peripheral portion of the structure support bottom plate or the structure support beam 1.
Between the inner edge of the horizontal wall 82 and the notch step 11 of the structure support bottom plate or the structure support beam 1, at least the horizontal movement allowable distance of the structure support bottom plate or the structure support beam 1. Is preferably provided. According to such a configuration, the retaining wall 8 prevents the outside soil from collapsing, and the horizontal wall 82
This prevents a child or the like from falling into the deep groove on the side of the retaining wall 8, and furthermore, the upper surface of the horizontal wall 82 is effectively used.

If the ground is not solid, a concrete pile 12 is buried in the ground below the foundation structure plate or the foundation structure beam 1, and is placed on the lower surface of the foundation structure plate or the foundation structure beam 1. It is preferable that the upper ends of the concrete piles 12 are connected by contact or connection bolts. In addition, through holes 1a and 1b for inspection are opened in a part of the structural support bottom plate or the structural support beam 1 and open to the side of the isolator 3 or the lead damper 4, so that an operator can enter and leave the through holes. It is preferable that inspection and repair can be performed. If a building is constructed on the base-isolated base structure manufactured as described above, vibration during an earthquake will be reduced, and safety will be ensured against a large earthquake.

[0014]

As described above, according to the seismic isolation structure of the present invention, the vibration at the time of an earthquake is reduced with a simple structure, and the safety against the vibration of a large earthquake is ensured.

[Brief description of the drawings]

FIG. 1 is an enlarged view of an embodiment of a base isolation structure of a building according to the present invention;

FIG. 2 is a sectional view of an embodiment of a base isolation structure for a building according to the present invention;

FIG. 3 is an enlarged view of an embodiment of the base isolation structure of a building according to the present invention;

FIG. 4 is a sectional view of an embodiment of a base isolation structure for a building according to the present invention;

FIG. 5 is an overall view of an embodiment of a base seismic isolation structure for a building according to the present invention,

FIG. 6 is an overall view of an embodiment of a base seismic isolation structure for a building according to the present invention;

FIG. 7 is an overall view of an embodiment of a base seismic isolation structure for a building according to the present invention,

FIG. 8 is an explanatory view of a base isolation structure of a building according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building support bottom plate or support beam 2 Foundation structure plate or foundation beam 3 Isolator 4 Lead damper 5 Crushed stone / sand 6a, 6b Steel pipe 7 Shock absorber 8 Retaining wall 9 Clearance 10 Peripheral edge of structure support bottom plate 1 11 Notch step 12 Concrete pile 13 High strength connection bolt 80 Inner wall surface of retaining wall 81 Upper edge of retaining wall 82 Horizontal wall of retaining wall h Allowable horizontal movement distance B Building

Claims (10)

[Claims] An isolator and a lead damper are interposed between a structural support bottom plate or a structural support beam and a substructure plate or a substructure beam provided under the ground.
A seismic isolation base structure for a building, wherein crushed stone or earth and sand is filled and interposed around the isolator and the lead damper. 2. An isolator and a lead damper are interposed between a structure support bottom plate or a structure support beam and a substructure plate or a substructure beam provided in the ground thereunder. At the upper edge of the plate or substructure beam, surrounding the isolator and the lead damper, a steel pipe is fixed at its upper edge to the structural support bottom plate or structural support beam in a non-contact state, and A seismic isolation base structure for a building, characterized in that crushed stone or earth and sand is filled and interposed outside the steel pipe. 3. An isolator and a lead damper are interposed between a structure support bottom plate or a structure support beam and a substructure plate or a substructure beam provided under the ground below the structure support bottom plate or the structure support beam. On the upper surface of the plate or the foundation structural beam, the steel pipe surrounds the isolator and the lead damper, and each of the steel pipes is fixed at its upper edge to the structural support bottom plate or the structural support beam in a non-contact state. Seismic isolation base structure of a building. 4. An inner wall surface of a steel pipe surrounding an isolator,
The seismic isolation base structure for a building according to any one of claims 2 or 3, wherein a shock absorber is attached to prevent horizontal movement of the isolator due to unexpected or excessive vibration. 5. A retaining wall is erected on an outer peripheral edge of a foundation structure plate or a foundation structural beam, and an inner wall surface of the retaining wall is connected to an outer peripheral edge of the structure supporting bottom plate or the structural supporting beam. The seismic isolation foundation structure for a building according to any one of claims 1 to 4, wherein a clearance is provided at least between the structural support bottom plate and the horizontal movement permissible distance. 6. A horizontal wall protruding inward from an upper edge of the retaining wall, a notch step is provided on an upper outer peripheral portion of the structure supporting bottom plate or the supporting beam, and an inner edge of the horizontal wall is provided. A clearance is provided between the structure support bottom plate and the notch step of the structure support beam or at least a horizontal movement allowable distance of the structure support bottom plate or the structure support beam. 6. The base isolation structure of a building according to any one of Items 5 to 5. 7. A concrete pile is provided in the ground below the foundation structure plate or the foundation structure beam, and an upper end of the concrete pile is contacted or connected to a lower surface of the foundation structure plate or the foundation structure beam. The base-isolated base structure for a building according to any one of claims 1 to 6, wherein 8. A concrete pile is provided in the ground below the foundation structure plate or the foundation structure beam, and a lower surface of the foundation structure plate or the foundation structure beam and an upper end of the concrete pile are connected and fixed by connection bolts. 2. The method according to claim 1, wherein
7. The base-isolated base structure of the building according to any one of Items 6 to 6. 9. A through hole for inspection which is opened on a side of an isolator or a lead damper is formed in a part of the structure support bottom plate or the structure support beam.
8. The base isolation structure of the structure according to any one of 8 above. 10. A base-isolated building, wherein a building is constructed on the base-isolated base structure according to any one of claims 1 to 9.