JPH09302702A - Foundation construction for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation construction capable of achieving a sufficient tremble dismissing effect, taking sufficient measures against the occurrence of differential settlement, and suppressing costs by a simple construction. SOLUTION: An upper plate 11 and a lower plate 12 are arranged between a superstructure and a substructure of a building. Then, a laminated rubber 14 and a plurality of detachable board bodies 15 for dimensional corrections are interposed between the upper and lower plates 11 and 12 which constitute a tremble dismissing effect, a lower end portion is fixed with the substructure 2 through the lower plate 12 around the laminated rubber 14 and the board body 15, and the upper end portion is supported with a cable body 16 fixed to the upper plate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation structure of a building having a seismic isolation device, which is effective against uneven settlement.

[0002]

2. Description of the Related Art In recent years, many seismic isolation structures in which laminated rubber is directly placed on the bottom surface of a foundation structure have been constructed. FIG.
In FIG. 1, reference numeral 1 is a general seismic isolation structure in which the conventional laminated rubber M is interposed between the lower structure 2 and the upper structure 3.

In a so-called seismic isolation structure, the natural period of the building is extended by a seismic isolation device such as laminated rubber to avoid the resonance phenomenon due to the coincidence of the dominant period and the natural period of the seismic motion, and the seismic force acting on the building. In addition to reducing the vibration, a damping device such as an elasto-plastic damper absorbs the vibration energy to reduce the seismic input and suppress the response displacement.

[0004]

However, when constructing the above-mentioned seismic isolation structure, it is necessary to pay attention to the following points.

In the elastic range of this laminated rubber, the tensile side rigidity is about 1/10 of the compression side rigidity. Therefore, the ultimate proof stress of the laminated rubber is influenced by the axial force received by the rubber, particularly the tensile stress, and the ultimate proof stress of the rubber decreases as the tensile stress increases. As a result, at the time of an earthquake, the compressive force and the tensile force act alternately on the building, which causes an excessive burden.
It will be applied to the basic part where the compressive force acts.

Further, since an adhesive is used for laminating the rubber constituting the laminated rubber and the steel sheet, and the tensile strength of that portion is not so large, there is a problem that the strength may be insufficient. .

In the substructure of the direct foundation structure and the pile foundation structure, the groundwater level is lowered, or the influence of neighboring works such as excavation and construction of the structure, liquefaction of the ground at the time of earthquake, consolidation settlement, etc. Caused by ground subsidence and differential subsidence.

Further, in the structure of the support pile foundation type, when the ground under the structure of the support pile foundation type is liquefied, differential settlement occurs. Then, when replacing the structure of the support pile foundation type, if existing piles are used and new piles are additionally built up to construct the structure, and the pile types of the existing pile and the new pile are different, for example, the existing pile is In the case of driven piles, if driven piles for additional driving are adopted, the ground is too hard to construct, and there is no choice but to use other pile construction methods.In such cases, existing piles and new piles must be used. Different pile types cause uneven settlement between piles.

In the structure of the friction pile foundation type or the support pile foundation type embedded in the intermediate support layer, the groundwater level is lowered, the influence of neighboring construction (excavation, construction of a structure, etc.), or an earthquake occurs. Ground subsidence and differential subsidence occur due to causes such as liquefaction and consolidation settlement of the ground.

As described above, when the differential settlement occurs, the amount of settlement occurring on each foundation differs, which causes uncalculated stress and cracks in the entire structure, leading to destruction. Further, there is a problem that a crack is generated in the bottom plate directly on the ground, leading to destruction.

Moreover, the occurrence of these subsidences cannot be predicted at the design stage of the structure, and is caused by the subsequent change in the surrounding environment. Then, when a differential settlement occurs in the structure, there is a problem that the conventional seismic isolation structure may stop functioning.

In view of the above-mentioned circumstances, the present invention is capable of exerting a sufficient seismic isolation effect, and can sufficiently deal with the occurrence of differential settlement, has a simple structure, and can reduce costs. The purpose is to provide the basic structure.

[0013]

A basic structure of a building according to claim 1, wherein a seismic isolation device is interposed between an upper structure and a lower structure. ,
Between the upper structure or the lower structure and the seismic isolation device,
It is characterized in that a plate for dimensional correction between the upper and lower structures is detachably interposed. In the basic structure of this building, when uneven settlement etc. occur and the lower structure is displaced relative to the upper structure, the plate is attached and removed to correct the dimension between the upper and lower structures. It

In the basic structure of a building according to claim 2, an upper plate is arranged under the upper structure and a lower plate is arranged on the lower structure, and between the upper plate and the lower plate. A laminated rubber forming the seismic isolation device and a plurality of the plate bodies are interposed, and a lower end is fixed to the periphery of the laminated rubber and the plate body together with the lower structure by penetrating the lower plate, and an upper end portion. Is provided with a cord-like body fixed to the upper plate. In the basic structure of this building, when a compressive force and a tensile force alternately act on the building, such as during an earthquake, the tensile force acts on the cords and the laminated rubber is not subjected to the tensile force. In addition, when the lower structure is displaced relative to the upper structure due to uneven settlement or the like, the plate body is attached / detached to correct the dimension between the upper structure and the lower structure.

In the basic structure of a building according to claim 3, a pair of seismic isolation supporting structures, each of which is composed of the seismic isolation device and the plate, is horizontally arranged between the upper structure and the lower structure. In the horizontal direction, the lower structure is a bottom plate, and the bottom plate is provided with at least one seismic isolation support structure on its upper surface side as one unit. It is characterized by being divided into a plurality. In the basic structure of this building, when uneven settlement occurs, one unit of the bottom plate on which the seismically isolated support structure divided in the horizontal direction is arranged is capable of relative displacement. Also, when uneven settlement etc. occurs and the lower structure is relatively displaced, by attaching and detaching the plate body,
The dimensions between the upper and lower structures are corrected.

According to a fourth aspect of the present invention, the lower structure is a pile. In the basic structure of the building, when the piles are displaced relative to each other due to uneven settlement, the plate body is attached / detached to correct the dimension between the upper and lower structures.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, and reference numeral 1 is a building. The building 1 is roughly configured by a bottom plate 2 (a lower structure) provided on the ground G and an upper structure 3 provided on the bottom plate 2.

The upper structure 3 has a structure in which an upper skeleton 6 including beams and floors 4 and columns 5 is supported by a plurality of seismic isolation support structures 10.

As shown in FIG. 2, the bottom plate 2 is jointed into a substantially square shape, on which a plurality of seismic isolation support structures 10 are arranged. At jointed portions of the bottom plate 2, a slip bar and a water stop plate (not shown) are provided between the bottom plates 2 and 2.

As shown in FIG. 3, the seismic isolation support structure 10
Is a column lower portion 5a protruding below the bottom plate 2 and the upper structure 3.
It is installed between. An upper plate 11 is rigidly connected to the column lower portion 5a by welding, and a lower plate 12 is rigidly connected to the bottom plate 2 by anchor bolts 13.
A laminated rubber 14 is arranged on the upper portion of the lower plate 12 as a seismic isolation device, and a plurality of iron plates 15, 15 ... (Plates) are detachably provided on the upper portion of the laminated rubber 14. The steel offset wires 16 and 16 (cord) are tightly connected between the upper plate 11 and the lower plate 12.

As shown in FIG. 4, the steel stranded wire 16 is arranged so as to surround the laminated rubber 14, the iron plates 15 and 15, and a sheath 17 is provided around the steel stranded wire 16. Thus, the laminated rubber 14 is configured by alternately laminating a rubber plate and a steel plate with an adhesive. The laminated rubber 14 and the iron plates 15 and 15 have the same cross-sectional shape as seen in a plan view, with the sheath 17 part cut away.

As shown in FIG. 3, the steel stranded wire 16 has its upper end fixed by a fixing member 20 and its lower end fixed to an anchor bolt 13. As shown in FIG. 5, the fixing bracket 20 is installed on the upper part of the upper plate 11. The fixing bracket 20 includes an upper member 21, a lower member 22, and a fastening member 2.
3 and the bolt 24. And
The tightening member 23 has a hole centered on the central axis of the cone,
The cone is divided into four in the circumferential direction.

The upper member 21 and the lower member 22 are composed of a tightening member 23.
The conical portion has a recess having a shape substantially equal to that of the conical shape and a hole at a position corresponding to the hole of the fastening member 23. Further, the upper member 21 and the lower member 22 are positioned so that the recesses face each other, and the bolt 2
It is concluded by 4. Then, the fastening member 23 is
It is located between the upper member 21 and the lower member 22.

As shown in FIG. 6, the bolts 24 are located around the fastening member 23, and the steel strand 16 is attached to the fastening member 23.
Located in the center of the hole and inside the hole.

In the basic structure of the building having the above structure, the steel strand 16 is tightly connected between the upper plate 11 and the lower plate 12 by the fixing fitting 20. FIG.
As shown in FIG. 4, the fixing metal fitting 20 pulls the steel stranded wire 16 upward to locate it inside the hole of the lower member 22, the hole of the tightening member 23, and the hole of the upper member 21, and fastens the bolt 24. By doing so, it is fixed in a tightly connected state.

As mentioned above, the steel stranded wire 16 is tightly connected,
This tightly bound steel strand 16 enables the upper plate 1
1 and the lower plate 12 are clamped in the vertical direction, and as a result, the laminated rubber 14 and the iron plates 15, 15, ... Are clamped from above and below by the upper plate 11 and the lower plate 12.

The sheath 17 buffers the load applied by the deformation and displacement of the laminated rubber and the iron plate when the laminated rubber and the iron plate surrounding the steel stranded wire 16 are deformed and displaced. Protect from load.

Stress acts on this joint at all times and during earthquakes. Of the stress, the laminated rubber 14 and the iron plate 15 are used for compressive force, and the steel stranded wire 16 is used for tensile force.
However, the friction of the laminated rubber 14 and the iron plate 15 whose surfaces are pressed by the tightening of the steel stranded wire 16 acts against the shearing force.

In addition, when the ground G experiences a differential settlement that affects the superstructure during use of the structure,
The bottom plate 2 is relatively displaced between the bottom plates 2 by the action of a slip bar (not shown).

Next, based on FIG. 7, correction of the uneven settlement,
The resolution procedure will be described. During the period of use of the structure, the ground G
When differential settlement that affects the upper structure occurs, first, the bolt 24 in FIG. 5 is operated to release the fixing bracket 20, and the steel stranded wire 16 is removed. Next, the beams J and the like of the upper structure 3 near the seismic isolation support structure 10 which needs to correct the differential settlement are jacked up by the jack J. Next, the number of iron plates 15 on the laminated rubber 14 is corrected to the number required to eliminate the differential settlement.
Jack the beams 4 etc. of the upper structure 3 with the jack J.
To go down. Attach the steel stranded wire 16 again, and fix the metal fitting 2
Tighten with 0.

Here, when the bolt 24 is tightened, the distance between the sloped portion of the concave portion of the upper member 21 and the sloped portion of the lower member 22 becomes narrower. As a result, the tightening member 23 that contacts these
Is pushed in the direction of the center line of the steel strand 16 and the steel strand 1
6 will be tightened. Further, when the steel stranded wire 16 tries to move in a direction (downward in FIG. 5) so as to come out of the fixing fitting 20, the tightening member 23 is pulled in that direction due to friction between the stranded wire 16 and the steel stranded wire 16. become. By this movement, the tightening member 23 is pushed into the slope portion of the recess of the lower member 22, but the tightening member 23 is pushed in the direction of the center line of the steel strand 16 and tightens the steel strand 16. .

As described above, when a compressive force and a tensile force are alternately applied to a building during an earthquake, even if the tensile force acts on the steel stranded wire 16, the laminated rubber is not subjected to the tensile force. . Therefore, it is possible to prevent the laminated rubber 14 from exceeding the proof stress of the final phase, and prevent an excessive load from being applied. Also,
During the earthquake, the steel stranded wire 16 can be deformed following the deformation of the laminated rubber 14, so that the steel stranded wire 16 does not interfere with the seismic isolation effect.

In addition, when the ground G is unevenly subsided,
The relative displacement of the bottom plate 2 with respect to the upper structure 3 can be corrected by attaching and detaching the iron plates 15, 15.
As a result, the seismic isolation support structure 10 can correct and eliminate the differential settlement. As a result, when differential settlement occurs, the seismic isolation effect of the seismic isolation support structure 10 can be maintained. Also, when uneven settlement etc. occurs, the bottom plate 2
Because of the division, the shearing force is transmitted between the bottom plates 2 but the bending force is not transmitted, so that the bottom plate 2 can be prevented from being broken.

The laminated rubber 14 is constructed by alternately laminating rubber and steel plates with an adhesive, or is formed by laminating a number of unbonded iron plates and rubber. It may be configured by stacking thin pieces with one piece being one unit. In this case, the above-mentioned piece can be used instead of the iron plate 15 for the plate body for adjusting the number of sheets for adjusting the differential settlement.

As shown in FIG. 4, the laminated rubber 14,
The iron plates 15, 15 ... Have a substantially square cross section, but the shape is not limited to this and may be, for example, a substantially circular cross section. However,
In that case, the arrangement of the steel strands 16 is also circular. The arrangement and the number of the steel strands 16 shown in these figures are not limited, and can be changed according to design conditions.

Further, as shown in FIG. 8, the seismic isolation support structure 10 may be installed not between the bottom plate 2 but between the pile 2A and the pillar. At this time, the upper plate 11 is welded to the pillar 5a.
In addition, the lower plate 12 may have a structure in which it is rigidly connected to the head of the pile 2A or a column continuous with it by welding. And the sinking amount of the pile 2A can be adjusted individually.

Therefore, even when a differential settlement occurs,
It is possible to prevent structural damage due to an earthquake while exhibiting a seismic isolation effect.

[0038]

According to the basic structure of the building of the present invention, since the plate body is detachable on the laminated rubber as the seismic isolation device, a sufficient seismic isolation effect can be exerted and uneven settlement can be achieved. When it occurs, it is possible to sufficiently deal with it, the structure is simple, and the cost can be suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a basic structure of a building according to an embodiment of the present invention.

FIG. 2 is a plan view showing a basic structure of a building according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a seismic isolation support structure according to an embodiment of the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a cross-sectional view showing a fixture according to the embodiment of the present invention.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a sectional view showing differential settlement adjustment of the foundation structure of the building according to the embodiment of the present invention.

FIG. 8 is a sectional view showing a basic structure of a building according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a basic structure of a building including a conventional seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Building 2 ... Bottom plate (lower structure) 2A ... Pile (lower structure) 3 ... Upper structure 10 ... Seismic isolation support structure 11 ... Upper plate 12 ... Lower plate 14 ... Laminated rubber (seismic isolation device) 15 … Iron plate (plate) 16… Steel stranded wire (cord) 20… Fixing bracket

Claims (4)

[Claims] 1. A basic structure of a building structure in which a seismic isolation device is interposed between an upper structure and a lower structure, wherein the seismic isolation device is provided between the upper structure or the lower structure and the seismic isolation device. , A basic structure of a building, wherein a plate for dimension correction between the upper and lower structures is detachably interposed. 2. The foundation structure according to claim 1, wherein an upper plate is arranged under the upper structure, a lower plate is arranged on the lower structure, and the base plate is provided between the upper plate and the lower plate. A laminated rubber constituting the seismic device and a plurality of the plate bodies are interposed, and a lower end portion is fixed to the lower structure through the lower plate and is fixed around the laminated rubber and the plate body, and an upper end portion is formed. A basic structure of a building, which is provided with a cord-like body fixed to an upper plate. 3. The foundation structure according to claim 1 or 2, wherein a pair of seismic isolation support structures including the seismic isolation device and the plate are arranged horizontally between the upper structure and the lower structure. In the horizontal direction, the lower structure is a bottom plate, and at least one seismic isolation support structure is arranged on the upper surface side of the lower structure as one unit. The basic structure of a building characterized by being divided into multiple parts. 4. The foundation structure according to claim 1 or 2, wherein the lower structure is a pile.