JP2010156166A - Base isolating apparatus for wooden building structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of causing the detachment of a sill from the upper face of a continuous footing when the sill starts shifting from the upper face of the continuous footing due to rolling of the sill if an anchor bolt for fixing the sill to the upper face of the continuous footing is removed to make the sill freely movable relative to a foundation, and a problem of having difficulty in constituting a bearing member provided between the sill and the foundation to support the load of the sill in the horizontal movement allowed state of the sill. <P>SOLUTION: In a wooden house, the continuous footing is formed in iron strut shape independent of the foundation, and the upper end side of the continuous footing of strut shape independent of the foundation is connected and stuck to the lower face side of the sill. A hemispherical steel ball with a large diameter enlarged in curvature of a curved peripheral surface is fixed and mounted to the lower end side so that the curved surface side projects downward. A stainless steel plate for supporting the hemispherical steel ball at the bottom face of the continuous footing is installed on the upper face of the foundation and at an installed portion of the continuous footing of iron strut shape, and a return spring for returning the sill into the initial set position of the sill is disposed between the sill and the foundation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic isolation device for a wooden building structure mainly intended for wooden houses.

  Seismic isolation means for wooden building structures such as wooden houses are performed using a mechanism / structure with a special structure that is complicated and troublesome to assemble into the building structure.

  This is because, as shown in Figs. 1 and 2, the construction of a wooden house is usually laid with crushed stone a on the site to be built, and then rebar b is placed in the formwork. Then, a reinforced concrete foundation c to be poured into the concrete is laid, and a reinforced concrete cloth foundation d is erected at a height corresponding to the underfloor dimension of the house on the upper surface of the cloth foundation d. The base 1 made of timber made of timber is mounted, and this base 1 is inserted into an anchor bolt 2 that is embedded in advance in the concrete of the fabric foundation d and the upper end protrudes from the upper surface of the fabric foundation d. Then, by fastening to the nut 20, it is fixed on the fabric foundation d, and the pillar 3 is built on the upper surface of the base 1, and the building structure of the wooden house is constructed by assembling it. Therefore, in order to assemble the seismic isolation structure, 1 is removed from the upper surface of the fabric foundation d integral with the foundation c so that the foundation 1 moves freely with respect to the foundation c, and the freely moving foundation 1 and foundation c In the state in which the horizontal movement of the base 1 is allowed, a support base such as a stacked spring plate for supporting the base 1 is provided, and the horizontal movement of the base 1 A return spring for restricting the base 1 to a range where it does not escape from the upper surface of the foundation d, and for restoring the base 1 moved laterally with respect to the fabric foundation d to the original initial set position. By constructing the seismic isolation structure into a special structure, it must be constructed so as to satisfy the condition of stretching between the base 1 and the fabric foundation d or foundation c.

  In this way, the seismic isolation structure that is assembled and constructed in the building structure of a wooden house is the bottom surface of the building structure so that the wooden building structure can move laterally in response to shaking during an earthquake. The base 1 forming the base 1 is removed from the upper surface of the fabric foundation d by removing the anchor bolts 2 so that the foundation 1 is fixed to the fabric foundation d. Since the base 1 is moved laterally due to the earthquake, the range of lateral movement is restricted so that the base 1 does not come off the upper surface of the fabric foundation d and cannot be restored. However, this regulation has a difficult problem. More specifically, the bottom surface 10 of the square member of the base 1 located on the outer peripheral side of the building structure A shown in FIGS. 1 and 2 moves in the direction shown by the arrow in FIG. When it slides out from the upper surface of the foundation d, the balance of supporting the building structure A depends on its weight, even if the entire bottom surface 10 does not come off from the upper surface of the fabric foundation d. When the whole building structure A starts to move, the base 1 slides out from the upper surface of the fabric foundation d and comes off. For this reason, if the movable range with respect to the cloth foundation d of the base 1 is set to be narrow so as to prevent this slipping out, there arises a problem that it becomes impossible to absorb the amplitude of the shaking of the earthquake.

  Further, by mounting the base 1 so that the lateral movement is free with respect to the upper surface of the fabric foundation d, it is possible to move laterally between the upper surface of the fabric foundation d and the bottom surface of the foundation 1. In this state, the support member for supporting the base 1 may be configured by laminating spring plates in multiple layers, or by arranging a number of steel balls in parallel so as to be able to roll to form a bearing. Although it is necessary, in this case, when the displacement of the base 1 with respect to the upper surface of the fabric foundation d becomes large, there arises a problem that the support member protrudes laterally and becomes non-functional. In addition, when the support member is configured by arranging a large number of small-diameter ball-shaped steel balls in parallel, the small-diameter steel balls can be inserted into the support surface of the base 1 or the fabric foundation d or crushed. There is a problem that the base 1 is prevented from moving without rolling.

  The problem to be solved in the present invention is to remove the anchor bolt 2 that fixes the base 1 on the upper surface of the fabric foundation d and to move the base 1 freely with respect to the foundation c for assembling the base isolation structure. The problem of the detachment of the base 1 from the upper surface of the fabric foundation d that occurs when the base 1 is displaced from the upper surface of the fabric foundation d due to the lateral shaking of the foundation 1, and the foundation 1 provided between the foundation 1 and the foundation c. This is to solve the problem that makes the structure of the support member supporting the load of the base 1 difficult in a state in which the lateral movement is allowed.

  The means of the present invention has been made on the basis of knowledge obtained through repeated trials and examinations in order to solve the above-described problems.

  That is, the problem that the bottom surface of the base 1 is detached from the upper surface of the fabric foundation d is that the foundation c is removed from the upper surface of the fabric foundation d by assuming that the fabric foundation d is constructed integrally with the foundation c. The fabric foundation d is formed separately from the foundation c, and the upper end side of the fabric foundation d is integrally assembled with the bottom surface of the base 1. If this is the case, the support member provided so that the lateral movement of the base 1 can be performed freely in a state where the load of the base 1 is supported will pop out if the lateral swing amplitude of the base 1 is slightly increased. This is because the support member is provided between the upper surface of the narrow fabric base d and the bottom surface of the base 1, and between the upper surface of the wide foundation c and the base 1. That can be solved by interposing the When using a steel ball that rolls in a bearing shape, the diameter of the steel ball is increased, and the curvature of the peripheral surface is increased, so that the steel ball can be rotated freely by preventing crushing and sticking. Although it is difficult to support, at this time, if the base surface that abuts the steel ball is a flat smooth surface, the steel ball will slide and function in the same way as rolling. This is due to the knowledge gained.

  And from this, in this invention, as a means for solving the above-mentioned subject, the base 1 is mounted on the upper surface of the fabric foundation d standing on the foundation c made of reinforced concrete laid on the site. In a wooden house that is built on the base 1 to construct the building structure A, the fabric foundation d is formed in a steel pillar shape separate from the foundation c, and the foundation pillar c is separated from the foundation c. The upper end side of the fabric foundation d is connected and fixed to the lower surface side of the base 1, and a large-diameter hemispherical steel ball 6 having a large curvature on the peripheral surface is provided on the lower end side, and the curved surface side thereof is directed downward. A stainless steel plate 5 that supports a hemispherical steel ball 6 on the bottom surface of the fabric foundation d is installed on the upper surface of the foundation c and is installed on the upper surface of the foundation c. Install and restore the foundation 1 to the original setting position between the foundation 1 and the foundation c It is intended to raise the seismic isolation structure of wooden building structures characterized by being disposed Shibane 9.

  In the seismic isolation structure according to the present invention, the fabric foundation d on which the base 1 constituting the bottom frame of the building structure is mounted is formed in a bundle column shape made of a steel material separate from the foundation c. By assembling the upper end side to the lower surface side of the base 1, a steel ball 6 which is integrally coupled to the base 1 and formed into a large-diameter downward hemisphere on the bottom surface on the lower end side is curved. It attaches as the attitude | position which the side protrudes toward the downward direction, but the protrusion top part of this hemispherical steel ball 6 is abutted on the approximate center part of the flat plate-shaped stainless steel plate 5 installed in the upper surface side of the foundation c, Since the building structure is supported by the fabric foundation d formed on the iron pillar, the projecting top of the hemispherical steel ball 6 on the lower surface of the bundle pillar-shaped fabric foundation d is supported. Is a flat stainless steel plate installed on the upper surface of the foundation c that collides with it Top surface, by displacement by sliding, so free to move in all directions in the horizontal direction.

  And between the base 1 which is the bottom frame of the building structure A and the foundation c, a protruding top part of a hemispherical steel ball 6 provided on the bottom surface of the cloth foundation d formed on the iron pillar is installed on the upper surface of the foundation c. When the upper surface of the flat plate-like stainless steel plate 5 is slid to change the contact portion with respect to the upper surface of the stainless steel plate 5, the return spring 9 is returned so that the contact portion returns to the initially set position. Therefore, when the foundation c moves laterally together with the ground due to the ground shaking in the event of an earthquake, the cloth foundation d, which is a bundled iron pillar that supports the building structure A, is formed in the building structure A. By sliding on the upper surface of the stainless steel plate 5 in a state where it is supported, the stress applied to the building structure A is absorbed, and a seismic isolation effect is produced.

  And the structure which accept | permits the movement of this building structure A in all directions of the horizontal direction with respect to the foundation c, the upper end side of the cloth foundation d formed in the shape of a bundle pillar separate from the foundation c is used for the lower surface of the base 1 A support base constructed by assembling and connecting in the form of a bundle column on the side, and slidably abutting a stainless steel plate 5 fixedly installed on the upper surface of the foundation c via a hemispherical steel ball, and laminating spring plates Therefore, the assembly of the mechanism to the building structure A is remarkably simplified.

  Moreover, since the upper end side of the fabric foundation d formed in the shape of an iron bundle column is integrally assembled to the lower surface of the base 1, it is possible to reliably prevent the lower surface of the base 1 from escaping from the upper surface of the fabric foundation d. .

  In addition, the movement of the building structure A with respect to the foundation c due to ground shaking is fixedly installed on the upper surface of the foundation c and the hemispherical steel ball 6 provided on the bottom surface of the iron bundle columnar cloth foundation d connected to the lower surface of the base 1 The movement of the hemispherical steel ball 6 between the stainless steel plate 5 and the stainless steel plate 5 is caused by slippage between the stainless steel plate 5 and the stainless steel plate 5. The surrounding wall of the stainless steel plate 5 is bent at the periphery of the stainless steel plate 5 or the stainless steel plate 5 is bent, or the stainless steel plate 5 is slid against the peripheral wall surface of the ball 6 and the upper surface of the stainless steel plate 5 of the steel ball 6 is slid. It is easily obtained by an assembly frame formed on a holding member for assembling and holding the steel plate 5.

  Moreover, only the iron pillar-shaped cloth foundation d and the building structure A assembled and mounted on the upper end side thereof move in the lateral direction with respect to the foundation c due to ground shaking between the foundation 1 and the foundation c. Since there is no member that moves together with the building structure, unlike the spring plate in the conventional means that interposes the support base on which the spring plates are stacked, the building structure A that has moved due to ground shaking is returned to the old position. The return spring 9 may be provided between the building structure A and the foundation c, and the return of the building structure A by the return spring 9 is ensured.

  Further, the foundation c is formed so as to collide with and support a large-diameter hemispherical steel ball 6 which is formed in an iron bundle pillar shape and is attached to the lower end of the cloth foundation d which is attached to the lower surface of the base 1. When the upper surface of the stainless steel plate 5 to be installed on the upper surface is formed in a concave shape that is dented with a gentle curvature from the peripheral edge toward the center, When the hemispherical steel ball 6 at the lower end of d slides and moves on the upper surface of the stainless steel plate 5, due to the weight load of the base 1, the hemispherical steel ball 6 causes the concave inclined surface of the stainless steel plate 5 to Since it slides down toward the center of the deepest concave surface, the return of movement due to shaking is combined with the action of the return spring 9 and the weight load of the building structure A received by the hemispherical steel ball 6 Smooth movement of the return operation That.

  Next, embodiments of the means of the present invention will be described in detail with reference to the drawings.

  First, crushed stone a is spread over the ground GL of the site where the building structure of the wooden house is to be constructed, as shown in FIGS. 3 and 4, and a formwork is installed on the ground GL. Reinforcement b is arranged in the concrete and concrete is poured, and a reinforced concrete foundation c is laid. The foundation c may be laid in a row form at the position where the cloth foundation d is laid as in the example of the conventional means shown in FIGS. 1 and 2, but in this example, the foundation c is shown in FIG. As shown, it is laid on the ground GL of the site as a solid foundation c laid out in a single board shape.

  In the conventional normal means, in the conventional normal means, a steel material as a reinforcing bar is set up and arranged at a portion where the cloth foundation d on the upper surface is constructed, and the concrete is poured into this to flow the concrete. The fabric foundation d is laid continuously in one piece, but in the means of the present invention, the reinforcing bar for constructing the fabric foundation is not provided on the upper surface side, and the upper surface is finished in a flat plate shape. is there.

  A stainless steel plate 5 held by the holding frame 4 is disposed at a predetermined position on the upper surface of the foundation c laid in a flat plate shape. The stainless steel plate 5 is a hard metal plate obtained by subjecting a thick steel plate to rust-proofing, and has a width that is approximately twice as large as the diameter of the column 3 used in the wooden building structure A. As shown in FIGS. 7 and 8, the metal plate is assembled and held in a flat plate shape on the upper surface side of the holding frame 4 formed in a square plate shape.

  As shown in FIGS. 7 and 8, the holding frame 4 of the stainless steel plate 5 leaves the peripheral edge of the opening on the upper surface of the outer frame 40 in an edge frame shape inside a flat box-shaped outer frame 40 made of steel. The concrete is poured into a depth and formed into a square plate shape. On the top surface of the concrete cast into a plate shape, a stainless steel plate 5 made of a square plate is placed, and the outer periphery of the four sides of the plate is placed on the outer frame. 40 are fitted and fixed to the inner wall surface of the steel plate 40, and fixing screws 41 are inserted into screw holes respectively formed at the four corners of the stainless steel plate 5, and screwed into female screws previously embedded in the concrete. As a result, the stainless steel plate 5 is assembled and held.

  The holding frame 4 is assembled and installed integrally with the foundation c by fastening a mounting seat (not shown) formed on the outer peripheral side of the holding frame 4 to the upper surface side of the foundation c by bolting. However, in this example, in order to make it possible to change and adjust the height position of the upper surface of the held stainless steel plate 5, a support leg whose protrusion length varies due to rotation is provided on the bottom surface side of the holding frame 4. 42 is attached by screw fitting.

  The holding frame 4 is for installing the stainless steel plate 5 to be held at a predetermined position on the upper surface of the foundation c, and the stainless steel plate 5 is in the form of a bundle pillar-shaped iron pillar that is separated from the foundation c by a steel material. The hemispherical steel ball 6 provided on the bottom surface of the fabric foundation d to be assembled and connected to the bottom surface of the base 1 at the bottom of the building structure A is formed to support this hemispherical steel column. The cloth foundation d is provided so as to correspond to the position to be assembled and connected.

  If the structure of the wooden building structure A constructed on the foundation c is, for example, as shown in the foundation plan view of FIG. As shown in FIG. 6, they are respectively arranged at locations below the pillars 3 erected on the lower surface side of the base 1 and installed on the upper surface of the foundation c.

  On the stainless steel plate 5 arranged in this manner, a cloth base formed by forming a square cylinder 7 with a steel plate, having a top plate 70 on the upper end side, and a bottom plate 71 on the lower end side, assembled in a steel bundle column shape. d is arranged.

  The fabric foundation d assembled in the shape of a steel bundle column has an assembly seat 8 for assembling and connecting to the lower surface of the base 1 on the upper end side thereof, and the bottom surface of the lower end is made of steel and has a diameter. A large-diameter hemispherical steel ball 6 substantially corresponding to the diameter of the iron pillar is attached in such a posture that its spherical surface protrudes downward.

  The assembly seat 8 to be installed on the upper end side of the fabric foundation d in the form of an iron bundle column is formed into a shape suitable for the shape of the base 1 where the fabric foundation d is to be assembled and connected. deep.

  When the fabric foundation d is to be assembled and connected to the lower part of the pillar 3 standing at the intermediate part in the longitudinal direction of the square member of the base 1, or to the part slightly displaced from the lower part of the pillar 3, As shown in FIGS. 9 to 10, the seat 8 rises so as to sandwich the base 1 from the edge of the top plate 70 provided at the upper end of the iron cylinder 7, and faces the pair. The plate 80 is formed into a shape. Moreover, in the cloth foundation d assembled below the pillar 3 standing on the corner of the base 1, as shown in FIGS. 12 to 14, in plan view from both sides of the protruding corner portion of the top plate 70. An assembly seat plate 80 that rises in an L shape and an assembly seat plate 80 that rises in a small L shape in a plan view are formed in a corner portion. In addition, in the fabric foundation d assembled below the pillar 3 that is erected at the portion where the square material of the base 1 crosses in a cross shape, as shown in FIGS. 15 to 17, at the four corners of the top plate 70, It forms in the shape which comprises the assembly | attachment seat board 80 which stands | starts up in a corner shape by planar view. Moreover, in the cloth foundation d assembled below the pillar 3 that is erected at the portion where the square member of the base 1 hits in a T shape, as shown in FIGS. 18 to 20, of the four sides of the top plate 70, The assembly seat plate 80 rising from the edge along the wall surface of the square member of the base 1 and a small plan view rising along both wall surfaces of the square member that abuts against the square member of the base member 1 at both corners of the opposite edge. It is formed in a shape having an L-shaped assembly seat plate 80. Further, a reinforcing rib 72 that reinforces the assembly seat 8 is provided on the lower surface side of the top plate 70 of the assembly seat 8.

  A large-diameter hemispherical steel ball 6 provided on the bottom side of the main body of the cloth foundation d formed in the form of a bundle pillar-shaped iron pillar is an outer surface of the bottom plate 71 assembled to the lower end of the main body 7 of the cloth foundation d in the form of the iron pillar. As shown in FIG. 22, the bottom surface 71 is attached to the lower surface side of the bottom plate 71 before the bottom plate 71 is assembled to the fabric foundation d. They are connected by screws 73 screwed in from the side or, as shown in FIG. 21, the peripheral edge of the joined hemispherical steel ball 6 and the bottom plate 71 are integrally connected by welding 74 and attached. Is attached to the bottom surface of the fabric foundation d by being joined and fixed to the cylindrical body 7 of the body of the fabric foundation d made of iron pillars by welding 75.

  The fabric foundation d in the form of a bundle pillar-shaped iron pillar configured as described above is an assembly seat provided on the upper end side at a lower portion of the pillar 3 standing on the base 1 on the lower surface of the base 1 assembled with the shaft. Assemble by 8 and connect. As a result, the base 1 is assembled and mounted on a large number of cloth foundations d in the form of bundle pillar-shaped iron pillars provided on the lower surface, and a large-diameter hemisphere provided on the bottom surface of each bundle pillar-like cloth foundation d. The lower end of the gently spherical surface of the steel ball 6 collides with the hard and smooth upper surface of the stainless steel plate 5 placed on the upper surface of the foundation c, and is supported on the upper surface of the foundation c by the abutting portion. Become so.

  And when the base 1 receives the load of a horizontal direction, the hemispherical steel ball 6 of the bottom face of the fabric foundation d made into the shape of a bundle pillar-shaped iron pillar slides on the upper surface of the stainless steel plate 5, and displaces. 1 is assumed to be movable in the horizontal direction.

  9 is a stainless steel plate to be installed on the upper surface of the foundation c of the large-diameter hemispherical steel ball 6 provided on the bottom surface of the cloth foundation d which is formed in the shape of an iron bundle pillar integrally assembled on the lower surface side of the base 1 5 is a return spring that is stretched between the base 1 and the foundation c so as to return to the original set position when displaced by sliding with respect to the upper surface, and as shown in FIG. Coordinated and installed near the position where the iron bundle columnar cloth foundation d is assembled.

  The return spring 9 is formed by forming a thick steel wire 90 into a coil shape, insert-molding it with a rubber or resin coating 91 having elasticity, and forming it into an upright cylindrical shape. The mounting bases 92 and 93 are respectively installed on the side, and the lower mounting base 92 is fixed to the upper surface of the foundation c with mounting bolts, and the upper mounting base 93 is fixed to the lower surface of the fire beam 11. It is installed by being fixed to it with a mounting bolt.

  The return spring 9 may be stretched in parallel with a number of ordinary coil springs that extend when the base 1 moves sideways and return the movement of the base 1 with its restoring force. However, in this example, a thick steel wire 90 is wound into a coil shape and is formed into a cylindrical shape, which is elastically curved by the lateral shaking of the base 1 and its restoring force to an upright state. The base 1 is returned.

  23 and 24 show another embodiment. In this example, an iron bundle pillar-shaped cloth foundation d is provided at the corner of the base 1 or below the pillar 3 at the part assembled in a T-shape, and a return spring 9 is arranged at the near side position. This is an example in which the return spring 9 is installed between the fire beam 11 assembled to the base 1 and the foundation c when installed, and the rest of the configuration is the same as that of the previous embodiment. There is nothing.

  In this embodiment, the return spring 9 for restoring the lateral movement of the building structure A to the old position acts in the direction in which the longitudinal and lateral stress applied to the building structure A is combined. Therefore, the return to the old position by the restoring force of the spring is made efficient.

  Next, FIGS. 25 and 26 show still another embodiment. In this example, the upper surface of the stainless steel plate 5 installed on the upper surface of the foundation c has a gentler curvature than the curvature of the peripheral surface of the large-diameter hemispherical steel ball 6 provided at the lower end of the fabric foundation d. The hemispherical steel ball 6 at the lower end of the fabric foundation d that abuts against the center portion is formed by a weight load of the building structure A to be supported by the stainless steel plate 5. This is an example in which it moves so as to slide toward the deepest recessed central portion of the upper surface of the.

  In this example, the stainless steel plate 5 is recessed in advance with an arc surface whose upper surface has a gentler curvature than the curvature of the peripheral surface of the large-diameter hemispherical steel ball 6 fixedly attached to the lower end of the fabric foundation d. It is formed into a concave shape, and this is placed on the concrete 50 poured into the holding frame 4 made of a steel plate, and the screws 41 are inserted into the screw holes provided at the four corners, to the concrete 50 to be poured. The holding screw 4 is screwed into the embedded female screw 43 and assembled integrally with the holding frame 4, and the holding frame 4 is installed at a predetermined position on the upper surface of the foundation c, so that it is installed on the upper surface of the foundation c.

  Then, when the holding frame 4 is arranged at a predetermined position and installed, a steel bundle pillar-shaped cloth foundation d connected to the lower surface of the base 1 at the deepest recessed central portion of the stainless steel plate 5 having a hemispherical concave surface. The hemispherical steel ball 6 at the lower end of the steel ball 6 is positioned and installed so that the top end of the most protruding tip side of the peripheral surface is opposed.

  As a result, when the base 1 is moved sideways by shaking and the hemispherical steel ball 6 at the lower end of the fabric foundation d is slid and displaced on the upper surface of the stainless steel plate 5, the steel ball 6 is inclined to the concave surface of the stainless steel plate 5. Thus, the displacement of the return spring 9 can be smoothly returned by sliding back toward the center.

  The present invention means that the building structure is supported by a steel pillar-shaped cloth foundation at the bottom of the floor, and if it is structured to be constructed on the upper surface of the foundation, it is assembled with a steel frame. It can be applied to buildings as it is.

It is a vertical front view of the principal part of the building structure of a conventional wooden house. It is a vertical side view of the principal part of a building structure same as the above. It is a top view of the part of the foundation laid in the ground same as the above. It is a vertical front view of the principal part of the building structure of a wooden house which implements the means of the present invention. It is a sketch of the foundation which was assembled on the upper surface of the foundation same as the above. It is a top view which shows the arrangement | positioning position of the stainless steel plate installed in the upper surface of a foundation same as the above. It is the perspective view which fractured | ruptured partially the holding frame holding the stainless steel plate installed in the upper surface of a foundation same as the above. It is the perspective view seen from the lower surface side of the holding frame same as the above. It is a perspective view of the iron bundle column-shaped cloth foundation used for this invention means. It is a top view of a fabric foundation same as the above. It is a bottom view of the assembly seat provided in the upper end surface of a fabric base same as the above. It is a perspective view of what made the assembly seat of the upper surface of the fabric base same as the L type | mold. It is a top view of the assembly seat of the upper surface of a fabric base same as the above. It is a bottom view of the assembly base of the fabric foundation same as the above. It is a perspective view of the thing of the form which made the assembly seat of the fabric foundation same as the cross shape. It is a top view of the assembly seat of a fabric foundation same as the above. It is a bottom view of the assembly base of the fabric foundation same as the above. It is a perspective view of the thing which made the assembly seat of the upper surface of the fabric base same as the T-shape. It is a top view of the assembly seat of a fabric foundation same as the above. It is a bottom view of the assembly base of the fabric foundation same as the above. It is a vertical front view of the lower end part which assembled | attached the hemispherical steel ball of the dojo cloth foundation. It is explanatory drawing which shows the attachment means of the hemispherical steel ball attached to the lower end of a fabric base same as the above. It is the partially broken front view of the principal part of another Example. It is the top view which fractured | ruptured the principal part of the Example same as the above. It is the perspective view which fractured | ruptured the principal part of another Example. It is the front view which carried out the longitudinal section of the stainless steel plate and holding frame of an Example same as the above.

Explanation of symbols

A building structure GL ground a crushed stone b reinforcing bar c foundation d cloth foundation 1 foundation 10 bottom 11 fire beam 2 anchor bolt 20 nut 3 pillar 4 holding frame 40 outer frame 41 fixing screw 42 support leg 43 female screw 5 stainless steel plate 50 concrete 6 Steel ball 7 Tubular body 70 Top plate 71 Bottom plate 72 Reinforcement rib 73 Screw 74 75 Welding 8 Assembly seat 80 Assembly seat plate 9 Return spring 90 Steel wire 91 Coating material 92 93 Mounting base

Claims (3)

  The foundation (1) is mounted on the upper surface of the fabric foundation (d) erected on the foundation (c) made of reinforced concrete laid on the site, and the building structure (A ), The fabric foundation (d) is formed in the shape of an iron bundle column separate from the foundation (c), and the upper end of the bundle columnar fabric foundation (d) separate from the foundation (c) The side is connected and fixed to the lower surface side of the base (1), and a large-diameter hemispherical steel ball (6) with a large curvature on the peripheral surface is projected on the lower end side, and its curved surface side protrudes downward The hemispherical steel ball (6) on the bottom surface of the fabric foundation (d) is placed on the upper surface of the foundation (c) on the portion where the iron bundle columnar fabric foundation (d) is installed. A stainless steel plate (5) to be supported is installed, and the base (1) is restored to the original set position between the base (1) and the foundation (c). Seismic Isolation of wooden building structures characterized by being arranged (9).   A plan view of the return spring (9) provided between the base (1) and the foundation (c) arranged near the position of the iron bundle columnar cloth foundation (d) to be assembled to the lower surface of the foundation (1) The base material (d) is arranged so as to be sandwiched between the fire beam (11) and the foundation (c) to be assembled to the base (1). Item 1. A seismic isolation structure for a wooden building structure according to item 1.   The fabric foundation (d), which is formed in the shape of an iron bundle column separate from the foundation (c) and is connected and fixed to the lower surface of the base (1), is positioned below the lower end of the fabric foundation (d) and is arranged on the upper surface of the foundation (c). The stainless steel plate (5) to be installed is formed into a shallow concave shape where the top surface of the stainless steel plate (5) becomes an arc surface with a gentle curvature from the peripheral edge toward the center, and the deepest top surface of the concave surface. The upper surface of the foundation (c) is arranged so that the central portion of the descending concave surface is located below the protruding end of the large-diameter hemispherical steel ball (6) to be attached to the lower end side of the fabric foundation (d). The seismic isolation structure for a wooden building structure according to claim 1, wherein

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