JP2022094844A - Roof base isolation structure - Google Patents

Abstract

To prevent the relative movement amount of a roof from exceeding an assumed amount.SOLUTION: A roof base isolation structure 102 comprises: a laminate rubber bearing 50 provided at a structure 20; a roof 30 supported on the laminate rubber bearing 50; a projected part 110 provided at the roof 30 to project downward; and a regulation part 120 which is provided at the structure 20 so as to surround the projected part 110 and which abuts against the projected part when the roof 30 moves in a horizontal direction relatively to the structure 20, and regulates the relative movement amount of the roof 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a roof seismic isolation structure.

Patent Document 1 discloses a technique relating to a seismic isolated building having a mechanism for suppressing the response of the building at the time of an earthquake. In this prior art, it is a multi-story seismic isolated building with a chamber formed in a part of the first layer, including the foundation and the pillars of the first layer protruding from the foundation, and follows the movement of the ground during an earthquake. A steel-framed upper structure consisting of a reinforced concrete lower structure, a first layer chamber structure and an upper layer structure, and a steel-framed upper structure that is relatively displaced from the lower structure during an earthquake, and a lower structure and an upper part. It consists of a seismic isolation device that intervenes between the structure and the structure. The maximum displacement is set so that the chamber of the first layer is displaced within the area surrounded by the columns of the first layer, and the support part of the seismic isolation device is set to the upper end of the columns of the first layer and the structure of the upper layer. The structure of the chamber portion of the first layer is suspended from the structure of the upper layer in a non-contact state with the lower structure so as to be interposed between the lower end portion.

Japanese Unexamined Patent Publication No. 2009-144419

A roof seismic isolation structure is known in which a seismic isolation bearing such as laminated rubber for absorbing the vibration of the roof at the time of an earthquake is interposed between the structure and the roof. With such a roof seismic isolation structure, if a large earthquake that exceeds expectations occurs and the relative movement amount of the roof exceeds expectations, there is a risk that problems such as damage to the seismic isolation bearings will occur.

In view of the above facts, it is an object of the present invention to prevent the relative movement amount of the roof from exceeding an assumption.

The first aspect is the seismic isolation support provided in the structure, the roof supported by the seismic isolation support, the projecting portion provided on the roof and protruding downward, and the projecting portion so as to surround the projecting portion. It is a roof seismic isolation structure provided on the structure and provided with a regulating portion that abuts when the roof moves relative to the structure in the horizontal direction and regulates the relative movement amount of the roof.

In the roof seismic isolation structure of the first aspect, when the roof moves relative to the structure in the horizontal direction at the time of an earthquake, the protrusion hits the regulating portion, so that the relative movement amount of the roof is regulated. Therefore, it is prevented that the relative movement amount of the roof exceeds the assumption.

In the second aspect, the roof has a truss structure portion having a V-shaped diagonal member, and the protruding portion is provided directly below the lower end portion of the V-shaped diagonal member. The roof seismic isolation structure according to the first aspect.

In the roof seismic isolation structure of the second aspect, by providing a projecting portion directly below the lower end portion of the diagonal member, the horizontal impact force when the projecting portion hits the regulation portion is applied to the truss structure portion via the diagonal member. It can be received as a whole, and deformation of the truss structure due to impact force is suppressed.

The third aspect is the roof seismic isolation structure according to the first aspect or the second aspect, wherein the contact surface with which the protrusion of the regulation portion abuts is circular in a plan view.

In the roof seismic isolation structure of the third aspect, the contact surface in which the protruding portion of the regulating portion abuts is formed into a circular shape in a plan view, so that the protruding portion can be moved relative to any direction in the horizontal direction. The relative movement amount until the roof hits the contact surface of the regulation portion can be the same or substantially the same.

In the fourth aspect, the outer shape of the roof is rectangular in a plan view, and the protrusions are provided at the four corners of the roof or in the vicinity of the corners, the first to third aspects. The roof seismic isolation structure according to any one of the above.

In the roof seismic isolation structure of the fourth aspect, by providing a protruding portion at or near the corner of the rectangular roof in a plan view, twisting of the roof when the protruding portion hits the regulation portion is suppressed. The roof.

According to the present invention, it is possible to prevent the relative movement amount of the roof from exceeding an assumption.

It is sectional drawing which shows typically the cross section along the Y direction of the stadium to which the roof seismic isolation structure of one Embodiment was applied. It is a top view schematically showing the stadium of FIG. 1 in a plan view. It is a front view which looked at the main part of the roof seismic isolation structure of the part A of FIG. 2 from the Y direction. It is a top view which looked at the main part of the roof seismic isolation structure of the part A of FIG. 2 from the Z direction. It is a side view which shows the main part of the roof seismic isolation structure of the part A of FIG. 2 in a partial cross section seen from the X direction. It is a perspective view of a regulation mechanism.

<Embodiment>
The roof seismic isolation structure according to the embodiment of the present invention will be described.

(structure)
First, the roof seismic isolation structure according to the embodiment of the present invention and the overall structure of the stadium to which the roof seismic isolation structure is applied will be described.

As shown in FIGS. 1 and 2, the stadium 10 is provided with spectator seats 14 around the field portion 12.

A roof seismic isolation structure 102 is applied to the roof 30 of the stadium 10. The roof seismic isolation structure 102 includes a laminated rubber bearing 50 as an example of a seismic isolation bearing (isolator), a roof 30 supported by the laminated rubber bearing 50, a protruding portion 110, and a regulating portion 120.

A laminated rubber bearing 50 is provided on the upper end portion 22 of the structure 20 constituting the spectator seat 14. The laminated rubber bearings 50 are installed on both sides of the upper end portion 22 in the Y direction along the X direction (see FIG. 2). Then, as described above, the roof 30 is supported by these laminated rubber bearings 50. The portion of the roof 30 from each corner toward the inside in the Y direction is a steel-framed truss structure portion 60.

As shown in FIGS. 3 to 5, the steel-framed truss structure 60 includes an upper chord member 62 (see FIGS. 3 and 4), a lower chord member 72 (see FIG. 5), a lower chord member 74, a connecting member 78, and a bundle member. It is configured to have 82 (FIGS. 3 and 5), a lumber 92 and a lumber 94 (see FIGS. 3 and 4). It should be noted that FIGS. 3 to 5 show the truss structure portion 60 of the A portion of FIG.

The lower chord member 72 (see FIG. 5) and the lower chord member 74 (see FIGS. 3 to 5) of the truss structure portion 60 are arranged along the X direction and are arranged at intervals in the Y direction. The ends of the lower chord member 72 (see FIG. 5) and the lower chord member 74 (see FIGS. 3 to 5) are connected to each other by a connecting member 78 (see FIGS. 3 to 5).

The upper chord member 62 (see FIGS. 3 and 4) is arranged along the X direction. Further, the upper chord member 62 is arranged above one of the lower chord members 72 (see FIG. 5).

As shown in FIG. 3, the ends of the upper chord member 62 and the lower chord member 72 are joined to each other by the bundle members 82 and 84, respectively. One of the bundle members 84 is arranged slightly obliquely with respect to the vertical direction.

As shown in FIGS. 3 and 4, the diagonal member 92 and the diagonal member 94 are joined between the upper chord member 62 and the lower chord member 74 in a V shape when viewed from the Y direction.

As shown in FIG. 3, the upper end portions of the diagonal member 92 and the diagonal member 94 are joined to the joint portion between the bundle members 82 and 84 and the upper chord member 62 via the gusset plate 95. Further, the lower end portions of the diagonal member 92 and the diagonal member 94 are joined to the central portion of the lower chord member 74 in the material axial direction via the gusset plate 96 (see also FIG. 6).

As shown in FIGS. 3 and 4, the above-mentioned laminated rubber bearing 50 is installed directly under the bundle members 82 and 84 of the lower chord member 72 (see FIG. 5).

As shown in FIG. 2, the portion corresponding to the truss structure portion 60 of the roof 30 of the stadium 10 is provided with a regulation mechanism 100 that regulates the amount of horizontal relative movement of the roof 30 with respect to the structure 20.

As shown in FIG. 1, the regulating mechanism 100 has a protruding portion 110 protruding downward from the truss structure portion 60 of the roof 30, and a regulating portion 120 provided at the upper end portion 22 of the structure 20. It is configured.

As shown in FIGS. 3 to 6, in the protruding portion 110, the lower end portion of the diagonal member 92 arranged in a V shape of the lower chord member 74 of the truss structure portion 60 and the lower end portion of the diagonal member 94 are joined to the roof 30. It protrudes from just below the site to the bottom. In the present embodiment, the protrusion 110 is composed of a square steel pipe, but the protrusion 110 is not limited to this. It may be composed of a cylindrical steel pipe, or may be composed of a rod-shaped steel material instead of a tubular steel material.

The restricting portion 120 is provided at the upper end portion 22 of the structure 20 and has an annular shape surrounding the protrusion 110.

As shown in FIGS. 4 and 6, the restricting portion 120 of the present embodiment has an annular shape in a plan view, and the contact surface 122, which is an inner wall surface, has a circular shape.

With such a regulation mechanism 100, when the roof 30 moves relative to the structure 20 in the horizontal direction at the time of an earthquake, the protrusion 110 hits the contact surface 122 of the regulation portion 120 and regulates the relative movement amount of the roof 30. The relative movement amount of the roof 30 in which the protruding portion 110 hits the contact surface 122 of the regulating portion 120 is set so as not to exceed the threshold value.

The threshold value is an upper limit value of the assumed horizontal relative movement amount of the roof 30, and is, for example, an upper limit relative movement amount in which the laminated rubber bearing 50 is damaged.

Although not shown, a shock absorbing member such as a rubber member that absorbs the impact when the protruding portion 110 collides with the regulating portion 120 is provided on the contact surface 122 of the regulating portion 120 or the side surface 112 of the protruding portion 110. It is provided.

Further, the laminated rubber bearing 50 of the present embodiment is a seismic isolation device having a lead plug at the center and having an energy absorbing function. An energy absorbing device such as an oil damper may be separately connected to the roof 30 and the structure 20.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

In the roof seismic isolation structure 102 of the present embodiment, when the roof 30 moves horizontally with respect to the structure 20 at the time of an earthquake, the protruding portion 110 hits the regulating portion 120, so that the relative movement amount of the roof 30 is regulated. .. Therefore, the relative movement amount of the roof 30 does not exceed the assumption even at the time of a large earthquake exceeding the assumption. That is, the relative movement amount of the roof 30 does not exceed the threshold value. Therefore, when the relative movement amount exceeds the assumption, problems such as breakage of the laminated rubber bearing 50 are prevented.

Further, by providing the projecting portion 110 directly below the lower end portion of the diagonal member 94 arranged in a V shape, the impact force in the horizontal direction when the projecting portion 110 hits the regulating portion 120 can be applied to the diagonal members 92 and 94. It is received by the entire truss structure 60 through. Therefore, the deformation of the truss structure portion 60 due to the impact force when the protruding portion 110 hits the regulating portion 120 is suppressed.

Further, by providing the laminated rubber bearing 50 directly under the bundle members 82 and 84 on which the vertical load of the roof 30 acts, deformation such as bending of the truss structure portion 60 due to the load of the roof 30 is suppressed.

Further, by forming the contact surface 122 with which the protruding portion 110 of the regulating portion 120 abuts into a circular shape in a plan view, the protruding portion 110 is a restricting portion regardless of the direction in which the roof 30 moves relative to the horizontal direction. The relative movement amount until it hits the contact surface 122 can be the same or substantially the same.

Further, the outer shape of the roof 30 is rectangular in a plan view, and the protrusions 110 are provided in the vicinity of the four corners of the roof 30. Therefore, twisting of the roof 30 when the protruding portion 110 hits the regulating portion 120 is suppressed.

Further, by providing the protruding portion 110 in the vicinity of the corner portion of the roof 30, it is possible to prevent the space for providing the spectator seat 14 from becoming narrow.

<Others>
The present invention is not limited to the above embodiment.

For example, in the above embodiment, the protrusion 110 has a rectangular outer shape in a horizontal cross section, but is not limited to this, and may be circular, for example. By making the outer shape of the protruding portion circular, it is possible to reduce the stress generated in the protruding portion when the protruding portion abuts on the regulating portion.

Further, for example, in the above embodiment, the regulation unit 120 has an annular shape in a plan view, and the contact surface 122, which is an inner wall surface, has a circular shape, but the present invention is not limited to this. For example, the regulating portion may have a rectangular outer shape and the contact surface 122 may be circular. Alternatively, the contact surface may have a polygonal shape.

Further, for example, in the above embodiment, the regulation unit 120 has a circular and closed structure, but the present invention is not limited to this. For example, a plurality of regulating portions may be arranged in an annular shape so as to surround the protrusion 110.

Further, in the above embodiment, the roof 30 is supported by the laminated rubber bearing 50, but the present invention is not limited to this. It may be another seismic isolation bearing (isolator). For example, the structure may be such that the roof 30 is supported by sliding bearings or rolling bearings.

Further, in the above embodiment, the roof 30 has a rectangular shape in a plan view, but the roof 30 is not limited to this. The outer shape of the roof 30 may be a triangle, a pentagon or more polygonal shape, or a circle.

Further, in the above embodiment, the roof seismic isolation structure of the present invention is applied to the stadium 10, but the present invention is not limited thereto. The seismic isolation structure of the present invention can be applied to buildings other than stadiums, such as exhibition halls and gymnasiums.

Further, it can be carried out in various embodiments without departing from the gist of the present invention.

10 Stadium 20 Structure 30 Roof 50 Laminated rubber bearings (an example of seismic isolation bearings)
60 Truss structure 92 Slanted lumber 94 Slanted lumber 100 Regulatory mechanism 102 Roof seismic isolation structure 110 Protruding part 120 Restricting part 122 Contact surface

Claims (4)

Seismic isolation bearings provided in the structure and
The roof supported by the seismic isolation bearing and
A protrusion provided on the roof and projecting downward,
A regulating portion provided on the structure so as to surround the protruding portion, which abuts when the roof moves relative to the structure in the horizontal direction and regulates the relative movement amount of the roof.
Roof seismic isolation structure with. The roof has a truss structure with diagonal members arranged in a V shape.
The protruding portion is provided directly below the lower end portion of the diagonal member arranged in a V shape.
The roof seismic isolation structure according to claim 1. The contact surface with which the protrusion of the regulation portion abuts is circular in a plan view.
The roof seismic isolation structure according to claim 1 or 2. The outer shape of the roof is rectangular in plan view.
The protrusions are provided at the four corners of the roof or in the vicinity of the corners.
The roof seismic isolation structure according to any one of claims 1 to 3.

Images