JP3741428B2 - Support foundation structure of structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support foundation structure for a structure that dramatically and economically enhances the seismic safety performance of a pile foundation that supports the structure and an upper building structure.
[0002]
[Prior art]
In 1995, the Great Hanshin-Awaji Earthquake caused enormous damage to the main body and foundation structure.
As a structural method that can dramatically improve the seismic safety performance of a building structure, a seismic isolation structure composed of an isolator such as laminated rubber and a damper that absorbs energy has been put into practical use. However, in the seismic isolation structure, the cost of the seismic isolation device is required, and at the same time, since it is usually a double foundation, the cost of the body is also increased, and a certain increase in cost is inevitable.
[0003]
On the other hand, many types of pile foundations such as pre-made piles and cast-in-place concrete piles have been used in soft ground, but many cases of pile damage have been reported in past earthquakes. In recent years, in order to improve the seismic safety performance of these pile foundations, pile head pin joining (Reference 1 = JP 10-227040, Reference 2 = JP 2001-348885) and pile head rotation free joining method (Reference 3) = Japanese Patent No. 3159380) Several joining methods and joining devices that do not restrain pile heads have been developed.
[0004]
As methods for improving the seismic safety performance of both the structure and the pile foundation, Document 4 (JP 59-134230), Document 5 (JP 10-227039), Document 6 (JP 1) -304223).
[0005]
Reference 4 attempts to reduce the seismic force acting on the pile by placing a laminated rubber seismic isolation device at the pile head. However, when horizontal deformation δ occurs in the seismic isolation device, the vertical load P Due to the action (Pδ effect), a large additional moment M = Pδ is given to the pile head, and on the contrary, the load stress of the pile becomes severe. In addition, since the structure is embedded in the ground for the upper building, seismic motion is input to the building through the ground, and the seismic isolation effect cannot be expected.
[0006]
Reference 5 is a proposal to introduce a sliding mechanism between the pile head and the foundation footing, but the pile head itself is inclined and deformed during an earthquake, and the sliding surface of the pile head is inclined. Since it is rotationally constrained by underground beams, it does not incline and the sliding surfaces of both do not come into full contact with each other, and the basic mechanism of the sliding surface is not established. For this reason, it is not expected that this pile head sliding support will function normally, and the foundation frame is buried in contact with the ground as in Reference 4, so input to the upper building is not reduced and The earthquake effect cannot be expected.
[0007]
Reference 6 is a proposal that includes References 4 and 5, the upper building is supported by a pile, and the bottom of the building is an explanatory diagram separated from the ground (Figures 1 to 3 of Reference 6). Compared with the above-mentioned two documents, the intention aimed at the seismic isolation effect is clearly shown. However, when sliding material is directly connected to the top of the pile head as shown in Fig. 3 of the above-mentioned document 6, the pile itself is inclined during an earthquake, so that the normal contact condition between the sliding material and the sliding plate as pointed out in the above-mentioned document 5 Does not hold.
[0008]
In Fig. 2 of the same document, laminated rubber is placed on the pile head. As can be seen from the laminated rubber shown in the figure, the laminated rubber assumes horizontal shear deformation. Therefore, it can be judged that the rotation / inclination deformation can hardly be expected and the proposal is not expected. Therefore, this proposal is also a system that is difficult to follow the inclination of a large pile during a large earthquake. In addition, as pointed out in the above-mentioned document 4, a large additional bending moment acts on the pile due to the Pδ effect accompanying horizontal deformation of the laminated rubber, making it difficult to design the pile body. In addition, the additional bending causes the pile head to undergo further rotational deformation, so that the contact condition of the sliding surface is further disrupted, and the condition for establishing the sliding mechanism is very unclear.
[0009]
Further, in Reference 6, since the cushion material is interposed between the pile body and the surrounding wall by surrounding the periphery of the sliding material on the top surface of the pile with the hanging wall of the cylindrical support plate, a large allowable deformation is actually secured. As a result, it is difficult to achieve high seismic safety performance that is safe against strong ground motion during a large earthquake.
[0010]
The upper part (A) of FIG. 7 is a proposal example of the above-mentioned documents 4 and 6 in which the pile head seismic isolation device 4 having the laminated rubber 41 is arranged at the head of the pile 3. As shown in FIG. 7A, when a horizontal deformation δ occurs in the seismic isolation device during an earthquake, a large additional moment M = Pδ is given to the pile head due to the Pδ effect, and the burden stress on the pile becomes severe. In addition, since the foundation and underground frame are embedded in the ground, seismic motion is input to the building through the ground, and the seismic isolation effect cannot be expected.
[0011]
The lower part (B) of FIG. 7 is an already-explained explanatory diagram for realizing pile head pin joining by a ball seat proposed in Documents 1 and 2 and the like. As shown in FIG. 7B, the pile itself is inclined and deformed at the time of the earthquake, but the upper foundation footing is kept horizontal and does not incline because rotation is constrained by underground beams. Since the center of rotation of the pile slope does not coincide with the center of curvature of the ball seat in most cases, the contact condition of the ball seat breaks, and the sliding rotation of the ball seat does not function normally. This pin joint method using a ball seat has a fatal defect on the basic principle.
[0012]
Fig. 8 shows an enlarged view of the failure in the pile head when the pile is tilted. (1) (2) is the problem of the ball seat system, and (3) is the sliding bearing on the pile head. This indicates a malfunction. Both have shown that the contact condition of the ball seat 42 and sliding surface of a pile head collapses by the inclination of a pile.
[0013]
[Problems to be solved by the invention]
As described above, the seismic isolation structure that has been put to practical use up to now has a cost increase due to the cost of seismic isolation equipment and the cost of the double foundation. Moreover, the seismic isolation effect of the upper building cannot be demonstrated only with the joining device that realizes the pile head pin. In addition, the existing proposal that has been named as a pile head seismic isolation is incomplete in the mechanism of the seismic isolation mechanism at the pile head, and can provide a reliable and sufficient seismic isolation effect and seismic safety performance for the pile and superstructure. Things are not realized.
[0014]
The present invention is a structure capable of reliably and economically realizing a pile head joining method capable of dramatically improving the seismic safety performance of the pile and a high performance seismic isolation structure capable of dramatically improving the seismic safety performance of the upper building. The purpose is to provide a supporting foundation structure.
[0015]
The pile head rotation free joint construction method that realizes the improvement of the seismic performance of the pile has already been put into practical use, and several seismic isolation structures that have adopted this construction method have already been realized by the present inventor. The foundation footing is constructed on the joining device, the seismic isolation device is installed after restraining the foundation footing with the underground beam, and the foundation of the structure and the beam are constructed on it. It was something to do. Accordingly, the main object of the present invention is to realize a high seismic safety performance of both the pile and the superstructure more economically. It is to realize the “structure method”.
[0016]
[Means for Solving the Problems]
The present invention adopts the following configuration in order to solve the above points.
<Configuration 1>
A rotary body made of a spherical body or a cylindrical body, which is supported rotatably by a concave cradle, is disposed on a pile head that supports a structure including a foundation structure, and the rotary body above the rotary body. A smooth flat plate that is in contact with the rotating body is disposed on the bottom surface of the structure, and the bottom surface of the structure located around the flat plate is below the outer surface of the flat plate. Support structure for structures characterized by not protruding.
[0017]
<Configuration 2>
A joining device having a gently convex upper surface is provided on the top of the pile head that supports the structure including the foundation structure, and the joining device supports the structure located above the sliding joint. A smooth flat plate in contact with the joined body is disposed on the bottom surface of the structure, and the bottom surface of the structure located around the flat plate does not protrude below the outer surface of the flat plate. Supporting foundation structure of the structure that is characterized.
[0018]
<Configuration 3>
The pile head that supports the structure including the foundation structure can be rotationally deformed to at least one horizontal axis in the horizontal 2-axis (X / Y-axis) and vertical 1-axis (Z-axis) coordinate systems, and the horizontal shear force Is connected to the upper surface of the bonding device via a sliding material having a lubricating surface with a low coefficient of sliding friction. A smooth sliding plate that is in contact with the lubricating surface on the upper surface, and the bottom surface of the upper structure around the sliding plate does not protrude below the outer surface of the sliding plate. Supporting foundation structure.
[0019]
<Configuration 4>
In the support basic structure of the structure according to Configuration 2 or Configuration 3, the lubrication surface on the upper surface of the joining device is made of a coating material of pure PTFE, filled PTFE, polyamide resin, molybdenum disulfide, or fluorine coating material. A structure characterized in that the surface of the sliding surface of the sliding plate disposed above the joining device is made of a coating material of any one of a stainless steel plate, molybdenum disulfide, and fluorine coating. Supporting foundation structure.
[0020]
<Configuration 5>
In the support basic structure of the structure according to Configuration 3, the joining device sandwiches a pin fulcrum, a sphere, or a pseudo sphere that penetrates two or more vertical plane plates with a horizontal cylindrical pin, and is recessed above and below the pin fulcrum. Double ball seats with curved surfaces, joined with curved surfaces with convex and concave curved surfaces, and curved surfaces with different curvatures where the radius of curvature of the convex curved surface on the convex side is smaller than the radius of curvature of the concave surface. A support base structure for a structure, wherein rotational deformation is realized by interposing an inclined deformable rubber body composed of a plurality of rubber layers or other elastic body layers.
[0021]
<Configuration 6>
In the structure supporting foundation structure according to any one of the above configurations 1 to 5, the bottom surface of the structure other than the support point of the pile head and the surrounding area of the underground enclosure are not in direct contact with the ground below the structure and the surrounding area of the underground enclosure. Supporting foundation structure for structures characterized by being constructed as follows.
[0022]
<Configuration 7>
In the supporting basic structure of the structure according to any one of the above-described configurations 1 to 6, an elastic foam material such as urethane foam or polystyrene foam is provided between the entire circumference or a part of the ground or retaining wall around the underground frame and the structure. Or a supporting base structure for a structure, wherein an elastic material such as a rubber plate, or a honeycomb-shaped metal spring or a metal leaf spring is disposed.
[0023]
<Configuration 8>
In the support foundation structure of the structure according to any one of the above configurations 1 to 6, a ground side frame that behaves integrally with a pile foundation or the ground is constructed, and laminated rubber and rubber plates are provided between the ground side frame and the structure. Supporting base structure of a structure, which is equipped with a seismic isolation device for restoring force and other energy absorbing dampers.
[0024]
<Configuration 9>
In the structure supporting base structure according to any one of the above configurations 1 to 5, the structure is supported by a supporting device having the same configuration as the connecting device having the rotating portion, the upper joined body, and the upper sliding plate. There are no piles under the support device, and the support device is placed directly on the hard foundation such as concrete foundation footing or bedrock directly on the foundation. A supporting foundation structure for a structure, which is constructed so as not to directly touch the ground below the structure and around the underground structure.
[0025]
<Overview>
The present invention intends to simultaneously realize the seismic safety performance improvement of the pile and the seismic isolation performance of the superstructure by one system. First, in order to improve the seismic performance of the pile body, (1) release the fixed degree (rotational constraint) of the pile head that has been rigidly joined to suppress the generation of the pile head moment, and (2) It is to reduce the horizontal seismic force transmitted from the superstructure to the pile head. In order to reduce the seismic force acting on the pile head in (2), the seismic force generated in the upper building itself should be reduced by the seismic isolation structure, and the seismic force should not be transmitted to the pile head. In consideration of two countermeasures, the present invention introduces a seismic isolation mechanism to the pile head as a method of realizing both of them simultaneously.
[0026]
However, when the seismic isolation device is directly connected to the pile head, it should be avoided to apply an additional bending moment due to the Pδ effect to the pile head by the seismic isolation mechanism. For this reason, the present invention eliminates the sliding rubber bearings and rolling bearings in which the vertical load acting axis on the pile moves and the slide bearings and rolling bearings causing the deviation from the pile, and the vertical displacement of the pile head and the vertical load acting point A slide bearing in which a sphere having a pedestal on the pile side where slip does not occur or a slide member fixed to the pile side is adopted.
[0027]
In addition, it is necessary to take measures against tilting of the vertical axis of the pile near the head of the pile during an earthquake. In other words, because the vertical axis of the pile is inclined, when a sliding bearing is placed on the pile head, the sliding surface fixed upward on the pile head upper surface is inclined from the horizontal plane, and the inclination angle and A gap occurs and normal contact conditions between the sliding material and the sliding plate are not met. In addition, there are many proposals to place a ball seat with the same curvature on the head of the pile and realize the pin support condition by rotating the spherical surface, but the rotation of the pile during an earthquake near the head of the pile In most cases, the center of curvature and the center of curvature of the ball seat do not coincide with each other. As a result, a normal rotation mechanism on both the concave and convex sides of the ball seat is not established, and the pin support condition by the ball seat is not established.
[0028]
None of the existing proposals adopting the above-mentioned documents 1 and 2 and other ball seat type pin bearings solve this problem. In the present invention, two solutions are adopted to solve this problem. That is, as a method to enable smooth horizontal relative displacement between the pile and the bottom of the structure (= horizontal plane) above the pile even when the pile is inclined, (1) a rotating sphere is placed on the pile head. "Pile head rotation support mechanism" in which the bottom of the structure moves horizontally on the sphere regardless of the inclination of the pile, or (2) The upper surface of the pile head is a gentle spherical surface, and even if the pile is inclined, "Pile head spherical sliding mechanism" that does not change the contact conditions, or (3) Introduce a rotatable pin joint at the top of the pile body, and use the upper surface of the joint at the top of the pin joint as the sliding surface Adopt one of the "Pile-supporting-sliding mechanism" of "Pin-supporting sliding body + sliding plate" that arranges the sliding plate on the side.
[0029]
Other basic conditions employed in the present invention are as follows. In order to make the pin joint of the above-mentioned sliding joint and the joint part of the pile function reliably by the inclination of the pile,
a) Pin fulcrum obtained by penetrating two or more vertical flat plates with horizontal cylindrical pins = “horizontal through pin method”,
b) A “double sphere seat system” in which a sphere or a pseudo sphere having spherical surfaces on both upper and lower surfaces is sandwiched and concave and curved surfaces having substantially the same or slightly larger radius of curvature are arranged on the upper and lower sides.
c) “Concave and convex irregular curvature point contact method” in which the curved surface has a curved surface having a different curvature and is in contact with both curved surfaces, and the curvature radius of the convex curved surface on the convex side is smaller than that of the concave surface.
d) Any one of the “elastic body support system” is employed in which an elastically deformable rubber body composed of a thick single layer or a plurality of thick rubber layers or another elastic body layer is interposed in the joint.
[0030]
In addition, the foundation structure according to the present invention clearly separates the bottom of the structure and the basement from the ground so that the ground motion is not transmitted from the ground to the structure, and ensures a sufficient clearance for relative displacement. In order to enable relative displacement even if the pile head rotation surface and the slip part exceed the slip plate area, the periphery of the ground must be the same surface, and the clearance between the underground frame and the surrounding ground In the conventional base-isolated building, a special expansion joint hardware for passing was required on the upper part of the base isolation clearance part. This elastic material filling makes it possible to walk on the upper part and to secure the flow line around the base-isolated building on the ground surface.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments.
FIG. 1 shows a supporting foundation structure of a structure according to the present invention, (A) shows the entire structure of the foundation including the lower part of the building, the pile foundation, and the ground, and (B) shows the “pile head in the vicinity of the pile head. The basic configuration of the “pin support sliding mechanism” is shown enlarged.
[0032]
In FIG. 1, a joining device 5 is provided on the head of the pile 3. The joining device 5 includes a lower joining member 51 and an upper joining member 52 that are disposed to face the head of the pile 3 and a pin joining portion 50 that enables relative rotational displacement between them.
In order to use the joining device 5 as a sliding bearing, a sliding material 53 having a solid lubricant surface with a low friction coefficient is disposed on the upper surface of the upper joining member 52, and further, on the upper side of the sliding material 53, that is, the upper structure 1 or A sliding plate 54 that contacts the sliding member 53 is attached to the bottom surface of the foundation structure.
[0033]
The slip plate 54 is finished such that the lower outer surface thereof is flush with the bottom surface of the surrounding structure 1 or does not protrude downward from the bottom surface. This makes it possible to maintain a predetermined sliding function with the sliding material 53 even in the event of a displacement exceeding the region of the sliding plate 54 in the event of a large earthquake exceeding the expected level. The safety margin increases dramatically.
[0034]
As shown in FIG. 1A, a clearance 11 is constructed on the bottom surface of the structure 1 with a slight gap from the lower ground 2 so that earthquake motion is not transmitted from the lower ground 2. In order to provide the clearance 11 on the bottom surface of the structure, it is necessary to arrange a few supporting points for supporting the discarded formwork and the precast member on the bottom surface of the structure, but some support that does not increase the horizontal rigidity and the horizontal resistance force. Arrangement does not hinder performance.
In addition, a clearance 11 that can allow relative displacement between the ground 2 and the structure 1 in the event of an earthquake is provided around the underground structure, and a foamed material 12 such as foamed urethane or foamed polystyrene, and other elastic materials are disposed therein. At the same time as giving the object 1 a restoring force to return to the original position, a flow line is secured so that the object 1 can walk on the clearance around the structure.
Reference numeral 15 denotes a stud bolt that holds the sliding plate 54, and 22 denotes a ground-side discarded concrete retaining wall that secures the clearance 11.
[0035]
In the present invention, there are six types shown in FIG. 2 to FIG. 4 as support methods for pile foundations that can support the structure 1 and the structure 1 can be freely horizontally displaced with respect to the ground 2 even when the pile 3 is inclined during an earthquake. Nine types of support systems can be employed.
[0036]
A1 and A2 of FIG. 2 have shown the support foundation structure of the "pile head rotation support system". In the supporting basic structure of A1 in FIG. 2, a sphere 60 is arranged on a concave cradle 64 provided on the head of the pile 3, and the sphere 60 can rotate freely in two horizontal axes (X and Y axes). It can be moved. Between the cradle 64 and the sphere 60 is filled with grease or lubricating oil, or a surface treatment such as a molybdenum disulfide coating is performed to reduce the friction coefficient. The support basic structure of A2 in FIG. 2 employs a roller support in which a cylindrical roller 61 is arranged instead of a sphere on the cradle 64. In this case, the moving direction by rotation is one direction, and the direction orthogonal to the axis of the roller 61 is a sliding bearing.
[0037]
B in FIG. 2 is a method in which a sliding joint body 55 having a gently spherical upper surface is attached to the pile head, and even if the pile 3 is inclined, the contact condition with the sliding plate 54 on the upper side does not change. It shows the basic support structure of the "slip mechanism".
[0038]
3 and 4 show a “pin” in which a rotatable pin joint portion is introduced into the upper portion of the pile 3, and a slip plate is disposed on the bottom surface side of the structure with the upper surface of the joined body at the upper portion of the pin joint portion as a slip surface This shows the support foundation structure of the “Pile head pin support slip mechanism” of “Support slide body + slip plate”. Four types and six types of C to F are adopted as a configuration method of the rotatable pin joint portion.
[0039]
C in FIG. 3 is disposed opposite to the head of the pile 3 and passes through the center of the lower joint member 51 and the upper joint member 52 having two or more vertical plane plates with the horizontal joint pin 50. It shows the support horizontal structure of “horizontal penetrating pin method” as a pin fulcrum.
In this structure, the rotation direction is limited to one direction as in the case of the roller support of A2 in FIG. In the present invention, the rotation is in one horizontal direction or more, but as a case where the pin support function may be in one direction, for example, the pile foundation may be composed of a continuous underground wall. Although a pin fulcrum is required in the out-of-plane direction of the continuous underground wall, no tilt deformation occurs in the in-plane direction of the continuous underground wall, so that pin support is only required in the out-of-plane direction.
[0040]
D1 and D2 in FIG. 3 are piles in which a sphere 60 shown in D1 or a pseudosphere 62 having a spherical surface is sandwiched between two upper and lower surfaces shown in D2, and concave curved surfaces having substantially the same or slightly larger radius of curvature are arranged on the upper and lower sides. The support base structure of the “double ball seat system” is shown in which the side rotator receiving seat 64 and the joined body side spherical receiving seat 65 constitute a pin fulcrum that can freely rotate in two directions.
[0041]
E1 of FIG. 4 arrange | positions the concave receiving member 71 in the pile side head, arrange | positions the conjugate | zygote 72 which has a convex curved surface below on the upper side, and makes the curvature radius of a convex tip curved surface concave on both contact surfaces. The support foundation structure which comprises a pin fulcrum by the "concave / convex irregular curvature point contact system" made smaller than the curvature radius of is shown. From a macro viewpoint, the pin fulcrum is configured by a rotation (tilting) mechanism by point contact.
Also, a structure upside down from the structure shown by E1 in FIG. 4, that is, as shown by E2 in FIG. 4, a convex support member 72 having a convex curved surface is arranged on the pile side head, and the upper side thereof. It is good also as a support basic structure which arrange | positions the concave-shaped joining body 71 and comprises a pin fulcrum by the "uneven | corrugated uneven curvature point contact system".
[0042]
In FIG. 4F, a sloped deformable rubber body or other elastic body composed of a single-walled or multiple-walled rubber layer is provided between the pile-side joining member 81 and the elastic body upper joined body 82. The support basic structure which comprises a pin fulcrum by the "elastic body support system" which interposes the layer 80 is shown.
In the method shown in FIG. 2, the upper structure can move normally even if the pile is tilted by the rotation support and support mechanism or the spherical sliding mechanism formed on the pile head. In the methods shown in FIGS. Since a sliding mechanism supported by a free pin fulcrum can be configured, even if the pile 3 is tilted during an earthquake, the contact condition between the sliding surface at the top of the joint and the sliding plate at the bottom of the structure is maintained normally. Operates normally.
[0043]
As described above, the present invention has shown the method of realizing the seismic isolation foundation structure at the pile head that can protect both the pile and the superstructure from a large earthquake on the premise of the pile foundation. It can also be applied to cases.
[0044]
FIG. 5 shows an application example thereof, and the joining device portion of the present invention can be directly arranged on the concrete foundation footing 35 constructed on the supporting ground. In this case, the portion in contact with the concrete foundation has an appropriate degree of compressive stress on the concrete, and the bottom plate (base plate) shape may be changed to an appropriate shape so that anchor bolts for fixing can be arranged. In addition, when the concrete foundation footing 35 is unnecessary in a hard ground such as a bedrock, it is possible to directly arrange the present joining apparatus through only the level adjusting concrete or mortar on the bedrock.
[0045]
Note that the auxiliary stopper 17 for horizontal shearing force indicated by a broken line in FIG. 5B may be provided or may be omitted. This is an auxiliary stopper as a safety measure. As long as the bottom surface of the upper structure slide plate is kept horizontal, there is no fear that the joint on the pin will rotate or fall because of the pin fulcrum, and the sliding function is normal. The horizontal shearing force is transmitted to the ground side through the pin fulcrum. However, it is better to provide an auxiliary mechanism for maintaining the horizontality so that the joined body does not tilt or rotate during construction, for example, the horizontal ear member 18 shown by a broken line in the figure. For this purpose, this auxiliary stopper can be used. .
[0046]
FIG. 6 shows the case where the existing seismic isolation device 90 is used to adjust the restoring force and damping performance of the seismic isolation structure. Existing seismic isolation devices such as laminated rubber and various dampers are used. By appropriately combining them, it is possible to freely set and adjust the performance as a seismic isolation structure.
In FIG. 6 (A), an example of installation of the seismic isolation device 90 is shown on the left side, and a model conceptual diagram meaning performance adjustment is shown on the right side. FIG. 6B shows an example in which a clearance process that satisfies the restoring force adjustment and the walking flow line at the same time is performed by arranging a honeycomb mesh 13 or a honeycomb-shaped metal thin plate on the clearance 11 around the building 1. showed that.
[0047]
【The invention's effect】
As described above, when the structure support foundation structure of the present invention is adopted, the entire structure can be made a seismic isolation structure at almost the same cost as the pile head joining device disposed on the pile foundation. The seismic safety of both goods can be dramatically improved. The effects and merits of the present invention are summarized as follows.
(1) A pile head pin joint can be realized only by arranging a joining device at the pile head, and the seismic safety performance of the pile foundation can be enhanced.
(2) In addition to simply connecting the pile head to the pin, the upper surface of the upper joint is a rolling bearing or a sliding bearing. The seismic force acting on can be suppressed to an extremely small value.
(3) Further, since the horizontal force transmitted by the pile head joining device is the horizontal force acting on the upper structure = base shear, the upper structure has a very high-performance seismic isolation structure.
(4) That is, since the response acceleration and seismic force generated in the upper structure are remarkably suppressed, the seismic safety performance of the structure and its internal housing is dramatically improved, and the upper structure is economically improved. It becomes possible to design.
(5) The cost increase factor in the conventional seismic isolation structure is
B) The cost of seismic isolation equipment is high,
B) The foundation housing is doubled up and down the device;
C) An expensive expansion joint is required above the clearance.
D) The need for flexible joints in piping
But
In the present invention, the joint device for the pile head also serves as a seismic isolation device for a), and the conventional seismic isolation device is unnecessary, and the double foundation frame of b) is also unnecessary. Furthermore, the special expansion hardware of c) is also unnecessary, eliminating almost all the factors that increase the cost of conventional seismic isolation buildings.
(6) Therefore, in the present invention, an extremely high seismic isolation effect is realized without a cost increase factor, so that it is possible to construct at a much lower cost compared to a non-base-isolated conventional structure. .
[0048]
As described above, the present invention achieves (1) pile head pin joint that can greatly reduce the stress of the pile body during an earthquake, and (2) the seismic force acting on the pile by the pile head rolling mechanism and sliding mechanism itself. And (3) high-performance seismic isolation of superstructure buildings. The present invention, which realizes many of these high performances only with the joining device arranged on the pile head and eliminates the cost increase factors such as conventional seismic isolation devices and double foundations, is economical from the viewpoint of seismic performance. It provides a new basic structure method that is remarkably superior from a viewpoint, and greatly contributes to the development of social capital with excellent seismic safety performance.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a structure support foundation structure according to the present invention,
(A) is a cross-sectional view showing the overall structure of the foundation including the lower part of the building and the pile foundation / ground,
(B) is sectional drawing which shows the basic composition of a pile head vicinity.
FIG. 2 is a chart showing a cross-sectional configuration of a pile head joint device and a deformation state during an earthquake in a structure support foundation structure according to the present invention.
FIG. 3 is a chart showing a cross-sectional configuration of another pile head joining device and a deformation state during an earthquake in a structure supporting foundation structure according to the present invention.
FIG. 4 is a chart showing a cross-sectional configuration of another pile head joint device and a deformation state during an earthquake in the structure support foundation structure according to the present invention.
FIG. 5 is an explanatory diagram of an application method of the structure support foundation structure of the present invention when the ground is hard and does not require a pile foundation;
(A) is a cross-sectional view showing the overall structure of the foundation including the lower part of the building and the foundation / ground,
(B) is sectional drawing which shows the structure of a foundation support part vicinity.
FIG. 6 is an explanatory diagram of a configuration around the building of the structure supporting foundation structure of the present invention,
(A) is a sectional view showing an example of performing performance adjustment by combining existing seismic isolation devices,
(B) is sectional drawing which shows the example which arrange | positions a foam material and a honeycomb mesh in a building periphery clearance part, and ensures a restoring force adjustment and a walk flow line simultaneously.
FIG. 7 is an explanatory view of a conventional support base structure of a structure,
(A) is an explanatory diagram of a proposal for placing laminated rubber on a pile head,
(B) is explanatory drawing of pile head pin joining which arrange | positions a ball seat to a pile head.
FIG. 8 is an explanatory view of a conventional pile head pin and pile head sliding foundation structure.
[Explanation of symbols]
1: Structure
11: Clearance between building and ground
12: Foam for filling clearance
13: Honeycomb mesh for clearance
15: Stud bolt
17: Stopper for horizontal shear force
18: Auxiliary member for maintaining horizontality
2: Ground
21: Support ground
22: Ground-side discarded concrete and retaining wall
3: Pile
35: Concrete foundation footing
4: Conventional pile head seismic isolation device
41: Laminated rubber
42: Conventional pile head base
43: Conventional pile head sliding support
5: Joining device
50: Pin joint for rotational displacement
51: Lower joint member
52: Upper joined body
53: Sliding material
54: Sliding plate
55: Upper spherical sliding bearing
60: Sphere
61: Roller
62: Pseudosphere with both upper and lower spherical surfaces
64: Pile side rotating body receiving seat
65: Joint side spherical seat
71: Concave seat, concave joint (E2)
72: Convex joint, convex support member (E2)
80: Rubber layer
81: Pile side joining member
82: Elastic body upper joined body
90: Seismic isolation device

Claims (9)

On the pile head that supports the structure including the foundation structure, a rotating body consisting of a sphere or a cylindrical body, which is freely supported by the concave cradle, is disposed.
The rotating body supports a structure located above the rotating body,
A smooth flat plate in contact with the rotating body is disposed on the bottom surface of the structure,
The upper part of the concave cradle is separated from the flat plate to the extent that it does not contact the flat plate even when the pile head is inclined,
A support base structure for a structure, wherein a bottom surface of the structure located around the flat plate does not protrude downward from an outer surface of the flat plate. On the top of the pile head that supports the structure including the foundation structure, a sliding joint with a gently convex upper surface is provided,
The sliding joint is supporting the structure located above the sliding joint,
A smooth flat plate in contact with the joined body is disposed on the bottom surface of the structure,
A support base structure for a structure, wherein a bottom surface of the structure located around the flat plate does not protrude downward from an outer surface of the flat plate. The pile head that supports the structure including the foundation structure can be rotationally deformed to at least one horizontal axis in the horizontal 2-axis (X / Y-axis) and vertical 1-axis (Z-axis) coordinate systems, and the horizontal shear force A joining device capable of transmitting
On the upper surface of the joining device, the structure is supported via a sliding material having a lubricating surface with a low sliding friction coefficient,
A smooth sliding plate that is in contact with the lubricating surface of the upper surface of the sliding material is disposed on the bottom surface of the structure,
A supporting base structure for a structure, wherein a bottom surface of an upper structure around the sliding plate does not protrude below an outer surface of the sliding plate. In the support base structure of the structure according to claim 2 or claim 3,
The sliding surface disposed above the joining device, wherein the upper surface of the joining device is made of a coating material of pure PTFE, filled PTFE, polyamide resin, molybdenum disulfide, or fluorine coating material. A support base structure for a structure, wherein the surface of the sliding surface of the plate is made of a coating material of a stainless steel plate, molybdenum disulfide, or fluorine coating. In the support basic structure of the structure according to claim 3,
The joining device has a pin fulcrum penetrating two or more vertical flat plates with a horizontal cylindrical pin, a sphere or a pseudo sphere, and a double sphere seat with concave and convex surfaces above and below, and contact with both concave and convex curved surfaces. The curved radius of curvature of the tip of the convex side is smaller than the radius of curvature of the concave surface. The joint is in contact with curved surfaces with different curvatures, and the joint can be inclined and deformed with a thick single layer or multiple thick rubber layers. A support base structure for a structure, wherein a rotational deformation is realized by either interposing a rubber body or other elastic body layer. In the support base structure of the structure according to any one of claims 1 to 5,
A supporting foundation structure for a structure that is constructed so that the bottom of the structure and the surrounding area of the basement other than the support points of the pile head are not in direct contact with the ground under the structure and the surrounding area of the underground structure. In the supporting base structure of the structure according to any one of claims 1 to 6,
Elastic foam material such as urethane foam or polystyrene, elastic material such as rubber plate, or honeycomb-shaped metal spring or metal plate between the entire circumference of the surrounding area of the underground enclosure or a part of the ground or retaining wall and the structure A supporting base structure for a structure, characterized by arranging a spring. The support foundation structure for a structure according to any one of claims 1 to 6, wherein a ground side frame that behaves integrally with a pile foundation or the ground is constructed, and a laminated rubber or rubber is provided between the ground side frame and the structure. Supporting foundation structure for structures, which is equipped with seismic isolation devices such as plates and various energy absorption dampers. In the support base structure of the structure according to any one of claims 1 to 5,
The structure is supported by a support device having the same structure as the joining device having the rotating part and the upper joined body and the upper sliding plate. There is no pile below the supporting device, and the concrete foundation foot of the direct foundation is supported. Supporting devices are placed directly on the hard ground such as rocking or rock, and the bottom of the structure and the surrounding area of the basement other than the supporting points are constructed so that they do not directly touch the bottom of the structure and the ground around the basement. Supporting foundation structure for structures characterized by

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