JP4634829B2 - Base structure of base-isolated building - Google Patents

Description

The present invention relates to a basic structure of the seismic isolation building having a seismic isolation device.

  In recent years, a seismic isolation structure that separates the foundation from the superstructure has been put into practical use in order not to directly transmit the shaking of the ground during an earthquake to the building. Generally, a base-isolated structure is equipped with a base-isolated device such as a laminated rubber or a sliding bearing between the foundation and the superstructure to limit the input acceleration to the superstructure and reduce the horizontal force during the earthquake. In addition to reducing the seismic isolation effect, the natural period of the superstructure is lengthened.

  As shown in FIG. 11 and FIG. 12, for example, the foundation structure of such a base-isolated building is provided with base beams 53 that vertically and horizontally connect footings integrally with the slab 52 of the pit 51 serving as a base isolation layer. The seismic isolation device 54 is installed, and the upper structure 55 is designed to be supported on the seismic isolation device 54 so as to be horizontally displaced. A structure in which the seismic isolation layer is constructed on a rigid foundation and the deformation is concentrated on the seismic isolation device is considered advantageous for controlling the necessary damping and natural period.

  As the foundation structure of other seismic isolation buildings, a thick direct foundation like a mat is installed in the pit, and a seismic isolation device is installed on top of it, and the upper structure is supported on this seismic isolation device so that it can be displaced horizontally. Some were designed to do.

On the other hand, as shown in FIG. 13, for the purpose of reducing the construction cost, the pile head 56 supports the slab (direct foundation) 59 and the seismic isolation device 54 with pins, and the foundation beam 58 is attached to the bottom 57 of the upper structure. A foundation structure is also proposed in which the foundation beam of the slab 59 is omitted (see, for example, Patent Document 1). According to this structure, the pile head 56 is coupled to the slab 59 in the form of pin support, and the rotation of the pile head 56 with respect to the slab 59 is allowed without being restricted. Therefore, the maximum moment of the pile head 59 can be reduced. Moreover, construction cost is reduced by omitting the foundation beam on the slab 59 that has been provided conventionally.
JP-A-9-273162 (paragraphs 0007 to 0009)

  However, the basic structure of the conventional seismic isolation building has the following problems.

  In the base structure of the base-isolated building shown in FIG. 11 and FIG. 12, since the foundation beam 53 is provided in the pit 51, the structure becomes complicated, and construction labor such as bar arrangement and formwork installation is greatly increased. There was a problem that the cost was high and the horizontal movement was hindered, and the workability on the slab 52 (the seismic isolation pit) such as the installation of the seismic isolation device 54 was poor.

  In the base structure of a base-isolated building with a mat-like direct foundation, the necessary strength can be obtained without installing vertical and horizontal foundation beams, but the direct foundation becomes very large and heavy, which causes high costs. It was.

  On the other hand, in the base structure of the base-isolated building shown in FIG. 13, since the foundation beam of the slab 59 is omitted, the workability on the slab 52 is improved and the next process can be easily performed, but the rigidity of the slab 59 is reduced. At the same time, since the pile head 56 and the slab 59 are used as pin bearings, there is a tendency that the displacement and rotational deformation between the pile head 56 and the slab 59 increase, and the seismic isolation effect tends to decrease.

Therefore, in order to solve the above problems, the present invention is a seismically isolated building that can be constructed at a low cost and has sufficient strength and rigidity to obtain a necessary seismic isolation effect and is easy to work in a seismic isolation pit. it is an object of the present invention to provide a foundation structure.

In order to solve the above-mentioned problem, the invention according to claim 1 includes a pile, a foundation slab constructed on the ground where the pile is constructed, a gantry constructed immediately above the pile, the gantry, and an upper structure. In the base structure of a base-isolated building comprising a base-isolated device , a haunch is provided at the joint portion of the foundation slab with the pile head of the pile, and the upper end of the pile head is attached to the haunch. It is the base structure of the seismic isolation building characterized by having comprised so that rotation of the said pile head may be restrained by extending to the height beyond the upper end of .

  Here, the upper end of the head of the pile refers to a position above the main reinforcing bar provided on the pile and the upper end of the reinforcing steel bar to be covered by a predetermined concrete cover thickness. In addition, it is more convenient for the base constructed on the top of the pile to protrude a predetermined height from the top surface of the foundation slab, but it is convenient for installation of the seismic isolation device. You may build with the same.

According to the invention which concerns on Claim 1, while providing a haunch in the junction part with the head of a pile of a foundation slab, the pile is formed so that the head upper end may extend to the height more than the upper end of a haunch. Te, by reinforced and stiffen the surrounding pile head, while reducing the total thickness of the base slab, the pile head and the base slab can be joined with sufficient strength and rigidity. This restrains the rotation of the pile head and concentrates the deformation at the time of the earthquake on the seismic isolation device, increasing the seismic isolation effect and reducing the number of concrete and reinforcing bars and pit depth, etc. Is achieved. Furthermore, since the rigidity of the foundation slab is increased, there is no need to provide a foundation beam, and there is no hindrance to the next process.

The invention according to claim 2 is the foundation structure of the seismic isolation building according to claim 1 , wherein the pile head includes a main bar whose upper end extends to a height equal to or higher than the upper end of the haunch. is there.

The invention according to claim 3 is characterized in that a fixing bar for fixing the gantry to the pile head is arranged in the pile head. This is the basic structure of a base-isolated building .

The invention according to claim 4 is characterized in that the pile head is integrally formed by simultaneously placing the foundation slab, the haunch, and concrete, or by stopping concrete at the lower end of the foundation slab. The base structure of a base-isolated building according to any one of claims 1 to 3, wherein the base slab and concrete are simultaneously placed after the bar arrangement .

  According to the present invention, it has an excellent effect that it is possible to construct a basic structure of a base-isolated building that has sufficient strength and rigidity to obtain a necessary base-isolation effect and that is easy to work in a base-isolation pit at low cost. To do.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, a basic structure provided with a seismic isolation device using laminated rubber will be described as an example.

  FIG. 1 is a cross-sectional view showing the best mode for carrying out the base structure of a base-isolated building according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 4 is a sectional view taken along the line CC of FIG. 1, FIG. 5 is a sectional view taken along the line DD of FIG. 1, FIG. 6 is a plan view showing an example of the arrangement of the piles and auxiliary piles, and FIG. 6 is a cross-sectional view of E. In addition, FIG. 1 shows the junction part of a pile and a foundation slab on the left side in a drawing, and shows the junction part of an auxiliary pile and a foundation slab on the right side.

  First, the structure of the foundation structure of the base-isolated building which concerns on this Embodiment is demonstrated.

  As shown in FIG. 1, the base structure 1 of such a base-isolated building has a base-isolated structure made of laminated rubber 5 on a concrete base 4 formed on the top of a head 2 of a pile 2 (hereinafter referred to as a pile head). The device 6 is fixed. A foundation slab 7 having a predetermined thickness is formed over the entire surface of the foundation in the pit 10 around the pile head 3 (see FIG. 7). The seismic isolation device 6 is installed on the upper part of each pile 2 (see FIG. 6), and the upper structure 8 of the building is fixed to the upper part of the seismic isolation device 6. While reducing the horizontal force at the time of an earthquake, the seismic isolation effect is improved by making the natural period of the superstructure 8 longer.

  As shown in FIGS. 1 to 4, the pile 2 includes a main reinforcement 11 arranged at a predetermined pitch and a hoop reinforcement 12 surrounding the main reinforcement 11. A plurality of main reinforcing bars 11 are erected in an annular shape, and the upper ends of the main reinforcing bars 11 are arranged to extend to a height equal to or higher than the lower end face of the foundation slab 7 (in the present embodiment, near the upper end face of the foundation slab 7). . The pile head 3 is arranged with fixing bars 14 for fixing the gantry 4 to the pile head 3. The fixing bars 14 are arranged in a lattice shape in plan view so that a plurality of reinforcing bars bent in a U-shape can be secured in accordance with the planar shape of the gantry 4 (square in the present embodiment) and a predetermined concrete cover thickness can be secured. The main reinforcement 11 and the hoop reinforcement 12 of the pile 2 are arranged and arranged in an inverted U shape so as to cover from above. The lower end of the fixed bar 14 is arranged so as to extend to the vicinity of the lower end part of the haunch 9 described later. On the outer periphery of the plurality of fixed bars 14, hoop bars 15 bent in a square shape are provided at a predetermined pitch in the vertical direction. In the present embodiment, the gantry 4 is constructed to protrude from the upper end surface of the foundation slab 7 by a predetermined height, but may be constructed flush with the upper end face of the foundation slab 7.

  Here, the reinforcing bars (fixed bars 14 and hoop bars 15) that are overlapped with the main bars 11 provided on the pile 2 from above are arranged so as to serve as the main bars and the reinforcing bars of the gantry 4. ing. In this way, by fixing the main reinforcement 11 at a height equal to or higher than the lower end surface of the foundation slab 7, the fixing degree of the pile head joint is increased and the rigidity of the foundation slab 7 is increased. In addition, even if the upper end surface of the main reinforcement 11 is the height below the lower end face of the foundation slab 7, when the main reinforcement of the reinforcing bars 14 and 15 and the mount 4 covered from the upper part overlaps with the pile main reinforcement 11, It is included in the scope of implementation.

  A lower base plate 16 for fixing the seismic isolation device 6 is fixed on the gantry 4 via anchor bolts (not shown). The lower base plate 16 is provided with a cap nut (not shown). The seismic isolation device 6 is placed at a predetermined position on the lower base plate 16, and a bolt hole (not shown) in the flange of the seismic isolation device 6. The seismic isolation device 6 is fixed to the gantry 4 by screwing the bolt into the cap nut. An upper base plate 17 having the same configuration as the lower base plate 16 is provided on the upper part of the base isolation device 6, and the base isolation device 6 and the upper structure 8 are fixed via the upper base plate 17.

  By the way, as shown in FIG.1 and FIG.7, this invention has provided the haunch 9 in the junction part with the pile head 3 of the foundation slab 7, It is characterized by the above-mentioned. The haunch 9 is formed in an inverted frustoconical shape or an inverted quadrangular frustum shape (in the present embodiment, an inverted frustoconical shape) surrounding the pile head 3 at the lower part of the foundation slab 7, and joining the foundation slab 7 and the pile 2. By increasing the area, the rigid zone is expanded, and the bending and shear strength are increased along with the rotation restraint of the pile head 3.

  The foundation slab 7 is provided with horizontal bars (shown by broken lines in FIG. 3) 18 formed in a mesh shape with a pitch of 200 mm square, for example, at a position where a predetermined concrete cover thickness is obtained. The horizontal bar 18 is composed of an upper bar 21 provided at the upper part of the foundation slab 7 and a lower bar 22 provided at the lower part.

  As shown in FIGS. 1 and 4, bend bars 23 for joining the haunch 9 and the pile head 3 are arranged at the lower part of the haunch 9. For example, four bend bars 23 are radially arranged at a pitch of 90 degrees at a position where a predetermined concrete cover thickness is obtained from the lower end of the haunch 9. The arrangement of the bend bars 23 is not limited to a radial shape, and the material, diameter, number, and the like are appropriately determined according to the required proof stress and rigidity.

  The pile-side end of the bend bar 23 extends to the inside of the main bar 11 that is erected in an annular shape inside the pile 2 so as to ensure a predetermined fixing length with respect to the pile 2. The base slab side end portion of the bend bar 23 extends to between the upper bar 21 and the lower bar 22 of the base slab 7 so that a predetermined fixing length can be secured to the base slab 7. The end of the bend muscle 23 on the side of the basic slab 7 is bent in the horizontal direction so as to ensure a long fixing length.

  On the upper side of the bend bar 23, ring-shaped band bars 24 are arranged at a predetermined pitch. The processing diameter of the band 24 increases as it becomes the upper band 24. In addition, when the haunch 9 is formed in an inverted square frustum shape, the bend bars are arranged in a cross shape (lattice shape), and the straps are formed in a square shape to form a lattice arrangement.

  As shown in FIGS. 1 and 3, an upper end bar 21 and a lower end bar 22 constituting the horizontal bar 18 of the foundation slab 7 are located on the upper part of the haunch 9. In order to prevent the foundation slab 7 from being displaced in the vertical direction with respect to the pile 2, a detent bar 25 bent in an L shape is provided in the horizontal reinforcement 18 and the pile head 3. The detent bar 25 is arranged in an inverted L shape so that the vertical part 25a is positioned inside the main bar 11 inside the pile 2 and the horizontal part 25b can secure a predetermined fixing length with respect to the foundation slab 7. It extends between the upper end line 21 and the lower end line 22. A plurality of detent bars 25 are provided, and the horizontal portions 25b are arranged radially.

  In FIG. 1, reference numeral 26 indicates a gravel and 27 indicates abandoned concrete.

  As shown in FIG. 6, when the distance between adjacent piles 2 is long, auxiliary piles 31 are provided at predetermined positions of the foundation slab 7. Here, the predetermined position where the auxiliary pile 31 is installed means that the distance from the pile 2 is long (for example, 6500 mm), the auxiliary pile 31 is provided there, and the head of the auxiliary pile 31 of the foundation slab 7 (hereinafter referred to as auxiliary). It refers to a position where the shearing force applied to the foundation slab 7 can be reduced by providing the haunch 35 at a joint portion with the pile head 34). As shown in FIG. 1, the auxiliary pile 31 employs a settlement restraining pile 32 that is smaller and simpler than the pile 2 and that is easy to construct. In the present embodiment, the auxiliary pile 31 is formed by inserting the H-shaped steel 33 into a pile hole excavated in the ground and placing concrete around the H-shaped steel 33. The auxiliary pile 31 supports the load by friction between the outer peripheral surface and the ground. Note that reinforcing bars may be arranged around the H-shaped steel 33 to increase the fixing degree of the pile head 3.

  A haunch 35 is also provided at the joint portion of the foundation slab 7 with the auxiliary pile head 34. As with the haunch 9, the haunch 35 is also provided with a horizontal line 18 at the top and a bend line 36 at the bottom. The bend reinforcement 36 is extended so that the auxiliary pile side end abuts against the H-shaped steel 33, and the foundation slab side end can be secured to the foundation slab 7 so as to secure a predetermined fixing length. It extends between the bottom line 22. The bend bars 36 are radially arranged as shown in FIG. On the upper part of the bend line 36, a band line 37 is arranged at a predetermined pitch. In addition, a steel plate 38 extending in the horizontal direction is welded and fixed to the upper end of the H-shaped steel 33 in order to transmit the weight of the foundation slab 7 to the H-shaped steel 33.

  Next, a method for constructing the foundation of the base-isolated building according to the present embodiment will be described with reference to process explanatory diagrams shown in FIGS. In the present embodiment, the case where the pile 2 is a cast-in-place concrete pile will be described as an example.

(1) Pile construction process As shown in FIG. 8A, first, a hole for the pile 2 is excavated in the ground 41 to the support layer. And after inserting the reinforcing bar which has previously arranged the main reinforcement 11 and the hoop reinforcement (not shown in FIG. 8) in the said hole, concrete is laid. The main reinforcement 11 is arranged so as to extend to the vicinity of the upper end of the foundation slab to be formed in a later step. Concrete will be cast to the vicinity of the ground surface.

  When the pile is an off-the-shelf pile, it is driven to a position slightly above the depth of the bottom surface of the tapered surface to be excavated in the next process, and a reinforcing bar for joining the gantry to the pile head is provided.

(2) Excavation process As shown in FIG. 8 (b), the ground around the pile head 3 is excavated into a taper shape with an open cut. The excavation surface is excavated so as to have an inverted frustoconical shape or an inverted quadrangular frustum shape (in the present embodiment, an inverted frustoconical shape) with an inclination angle α of the slope portion 28 of about 45 degrees. Note that the inclination angle α is set according to the necessary seismic isolation effect, and is smaller than 45 degrees when more seismic isolation effect is desired. After that, the main bar 11 is exposed through the concrete of the pile head 3. The concrete hangs up to a point where the hanger surface is located slightly above the bottom surface of the tapered surface excavated. Thereafter, the gravel 26 is laid on the surface of the tapered surface and the surface of the ground 41, and the discarded concrete 27 is placed.

(3) Reinforcement process As shown in FIG. 8 (c), the upper reinforcement 21 and the lower reinforcement 22, which are the horizontal reinforcement 18 of the foundation slab 7, the bend reinforcement 23 of the haunch 9, the band reinforcement 24, and the pile 2 Then, after the reinforcing bars 25 are arranged to prevent the foundation slab 7 from shifting in the vertical direction, the fixing bars 14 and the hoop bars 15 of the base 4 of the seismic isolation device 6 are arranged. In FIG. 8C, reinforcing bars to be arranged in this step are displayed with thick lines to distinguish them from other reinforcing bars.

(4) Concrete placing process As shown in FIG. 9 (a), concrete is simultaneously placed on the foundation slab 7 portion, the pile head 3 portion and the haunch 9 portion, and the foundation slab 7, the pile head 3 and the haunch 9 are placed. And are integrally formed. Alternatively, the concrete may be stopped once at the lower end of the foundation slab 7 and the concrete of the foundation slab 7 portion may be placed after the reinforcement of the foundation slab 7.

(5) Seismic isolation device installation process As shown in FIG. 9B, the lower base plate 16 is installed on the top of the pile head 3. The lower base plate 16 is formed in a substantially square shape, and height adjusting tools 43 such as height adjusting screws are attached to the lower sides of the four corners, thereby ensuring the level of the lower base plate 16. Thereafter, the mold 44 is installed so as to surround the lower base plate 16. The lower base plate 16 is formed with a hole 45 for injecting concrete and the like and an air vent hole 46.

  In addition, when the height of the gantry 4 to be constructed is high, before the lower base plate 16 is installed, the covering step (not shown) is further arranged from the upper portion to secure the height, and then the above steps are performed. To do.

  As shown in FIG. 9 (c), concrete (may be grout or mortar) is poured into the mold 44 from the concrete injection hole 45 of the lower base plate 16 to form the gantry 4. At this time, since the air in the mold 44 is released from the air vent hole 46, the concrete can be placed smoothly. The height adjuster 43 below the lower base plate 16 is integrally buried in the gantry 4. Thereafter, the formwork 44 is removed, and the seismic isolation device 6 is installed on the lower base plate 16.

  Then, the upper structure 8 is fixed on the seismic isolation device 6 via the upper base plate 17 to be in the state shown in FIG.

  The haunch 35 of the auxiliary pile 31 is also basically constructed by the same construction method, although there are differences in the presence or absence of the seismic isolation device 6 and the base and the bar arrangement.

  Next, the operation of the basic structure of the base-isolated building and the construction method thereof according to the present embodiment will be described.

  According to the present embodiment, by forming the haunch 9 at the joint portion between the pile head 3 below the foundation slab 7, the joint strength between the pile head 3 and the foundation slab 7 is increased, and the pile head 3 Can be restricted. This makes it possible to ensure a desired seismic isolation effect even with a thin foundation slab 7. In particular, the pile head 3 extends to a height higher than the lower end of the foundation slab 7 (in this embodiment, the upper end of the foundation slab 7), and the pile head 3 is driven simultaneously with the foundation slab 7. And by forming integrally, the joint strength of the pile head 3 and the foundation slab 7, and the rotation restraint of the pile head 3 can be raised significantly.

  Moreover, the bending strength and rotational rigidity of the pile head 3 can be increased by arranging the bend muscle 23 on the haunch 9 and fixing it to the pile head 3. Further, since the horizontal streaks 18 are provided on the upper portion of the haunch 9, the degree of fixing is increased, the size of the haunch 9 can be reduced, and the cost for further construction can be reduced. In addition, the pile head 3 and the foundation slab 7 are fixed and fixed by the detent bars 25, and the bend bars 23 are provided radially at the lower portion and fixed to the pile head 3, so that the haunch 9 is shaped like an inverted truncated cone or By forming an inverted square frustum, an effective seismic isolation effect can be obtained against shaking in all directions of the earthquake.

  Furthermore, by providing the haunch 9 and increasing the joint strength and rigidity of the pile head 3 and the foundation slab 7 with priority, it is necessary without increasing the thickness of the foundation slab 7 as in the prior art. The rigidity of the foundation can be obtained. Therefore, the amount of concrete placement, the number of reinforcing bars, the depth of pits, etc. can be reduced, and the construction cost can be reduced.

  Moreover, since sufficient joint strength and rigidity can be obtained by the haunch 9, there is no need to provide a foundation beam on the foundation slab 7 as in the prior art, and the upper surface of the foundation slab 7 becomes flat, and the seismic isolation device 6 is installed. The next process in the seismic isolation pit becomes very easy.

  Furthermore, by providing the auxiliary pile 31 between the plurality of piles 2 having a long separation distance and providing the haunch 35, the stress generated in the foundation slab 7 can be reduced. Also, in the auxiliary pile 31, the horizontal bars 18 are located at the upper part of the haunch 35, and the bend bars 36 are radially provided at the lower part, so that the auxiliary pile head 34 and the foundation slab 7 are firmly joined. Can do. And by adopting the subsidence prevention pile which is easy to construct with a small and simple structure as compared to the pile 2, the construction period can be shortened and the construction cost can be reduced.

  FIG. 10 is a cross-sectional view showing another embodiment for implementing the base structure of the base-isolated building according to the present invention. The base structure 47 of the seismic isolation building according to this embodiment is different from the base structure 1 of FIG. 1 in that the horizontal bars 18 of the base slab 7 are continuously formed to the inside of the pile head 3. To do. In this case, since the horizontal bars 18 are arranged through the pile head 3, the horizontal bars 18 are fixed to the pile head 3. Therefore, the detent bar 25 shown in FIG. 1 can be omitted. In addition, since it is the same as that of the basic structure 1 of FIG. 1 about another structure, the same code | symbol is attached | subjected and description is abbreviate | omitted. According to this embodiment, since the joint strength between the foundation slab 7 and the pile head 3 can be further increased, a greater seismic isolation effect can be obtained.

  The present invention is not limited to the above-described embodiment, and appropriate design changes can be made without departing from the spirit of the present invention. For example, in the said embodiment, although the basic structure provided with the seismic isolation apparatus 6 provided with laminated rubber was demonstrated, the form of the seismic isolation apparatus 6 is not restricted to this. For example, other seismic isolation devices such as a high attenuation seismic isolation device or a sliding support type seismic isolation device may be used.

  Of course, the structure of the pile 2 is not limited to a cast-in-place concrete pile, but may be a ready-made pile made of concrete or steel pipe.

It is sectional drawing which showed the best form for implementing the foundation structure of the seismic isolation building which concerns on this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the top view which showed an example of arrangement | positioning of a pile and an auxiliary pile. Sectional drawing of E way of FIG. 6 is shown. (A) which showed the best form for implementing the foundation construction method of the seismic isolation building which concerns on this invention, (b) is excavation process explanatory drawing, (b) is excavation process explanatory drawing, (c) is bar arrangement process explanation FIG. (A) which showed the best form for implementing the foundation construction method of the seismic isolation building which concerns on this invention, (a) is concrete placement process explanatory drawing, (b) is a 1st explanatory drawing of a seismic isolation apparatus installation process, (c) ) Is a second explanatory view of the seismic isolation device installation process. It is sectional drawing which showed the other form for implementing the foundation structure of the seismic isolation building which concerns on this invention. It is sectional drawing which showed the basic structure of the conventional seismic isolation building. It is the top view which showed the basic structure of the conventional seismic isolation building. It is sectional drawing which showed the basic structure of the other conventional seismic isolation building.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foundation structure 2 Pile 3 Pile head 4 Base 6 Base isolation device 7 Foundation slab 8 Upper structure 9 Haunch 18 Horizontal reinforcement 23 Bend reinforcement 31 Auxiliary pile 32 Subsidence suppression pile 34 Auxiliary pile head 35 Haunch 36 Bend reinforcement 41 Ground 47 Foundation structure

Claims (4)

A base-isolated building comprising a pile, a foundation slab constructed on the ground on which the pile is constructed, a gantry constructed immediately above the pile, and a seismic isolation device installed between the gantry and the upper structure In the basic structure of
Constraining rotation of the pile head by providing a haunch at the joint of the foundation slab with the pile head of the pile and extending the upper end of the pile head to a height equal to or higher than the upper end of the haunch. The base structure of a base-isolated building, characterized by The base structure of the seismic isolation building according to claim 1, wherein the pile head includes a main bar whose upper end extends to a height equal to or higher than the upper end of the haunch. The base structure of the seismic isolation building according to claim 1, wherein a fixing bar for fixing the mount to the pile head is arranged on the pile head. The pile head is integrally formed by placing the foundation slab, the haunch and concrete at the same time, or the concrete slab is fixed at the lower end of the foundation slab and the foundation slab The base structure of a base-isolated building according to any one of claims 1 to 3, wherein the base is formed simultaneously with concrete.

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