Building

Abstract

To provide a technique that avoids concentration of a horizontal force on a high-rigidity structure, planar eccentricity, and generation of a large fluctuating axial force on a seismic isolation device while eliminating the need for excessive reinforcement, and enables seismic isolation of the entire building including the high-rigidity structure.SOLUTION: There is provided a building in which a part of a building skeleton 1 is a high-rigidity structure 2 having higher rigidity than surrounding building skeletons 1A and 1B and which includes a seismic isolation layer 5 in which a plurality of seismic isolation devices 51 and 52 are arranged. An upper layer 2U of the high-rigidity structure 2 is fixed to the surrounding building skelton 1A. A lower portion 2L of the high-rigidity structure 2 is supported by the seismic isolation device 52 independently of the surrounding building skelton 1B in a state where it is separated from the surrounding building skelton 1B.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a building provided with a seismic isolation layer in which a part of the building structure is a high-rigidity structure having higher rigidity than the surrounding building structures and a plurality of seismic isolation devices are arranged.

Background Art

[0002] As such a building, there is known a hospital building having a radiation therapy room configured as a high-rigidity structure as a part of the building structure (see, for example, Patent Documents 1 and 2). Since such a radiation therapy room in a hospital building houses a radiation therapy device such as a linac which is a radiation source, in order to shield leakage of radiation to the outside, it is configured as the above-described high-rigidity structure surrounded by a radiation shielding wall or the like having a wall thickness of about 1.5 m and extremely high rigidity. In a building having such a high-rigidity structure, concentration of horizontal forces such as seismic forces on the high-rigidity structure becomes a problem. Further, when such a high-rigidity structure is arranged at a position offset with respect to the center of the building in plan view, planar eccentricity of the building becomes a problem. And, in order to avoid such problems of concentration of horizontal forces and planar eccentricity, it is desirable to cut off the high-rigidity structure from the surrounding building structure.

[0003] Therefore, the building described in Patent Document 1 is configured such that the lower layer portion on the floor side of the high-rigidity structure is fixed to the surrounding building structure, and the upper layer portion on the upper floor side of the high-rigidity structure is cut off from the surrounding building structure. On the other hand, in the building described in Patent Document 2, the high-rigidity structure is directly attached to the building foundation, a plurality of seismic isolation devices are arranged on the building foundation and the high-rigidity structure, and the building structure other than the high-rigidity structure is provided on those seismic isolation devices, and the high-rigidity structure and the other building structures are configured to be entirely cut off from each other.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] In the building described in the above Patent Document 1, the vertical load of the upper building structure as viewed from the high-rigidity structure needs to be received on the top surface of the high-rigidity structure that is separated from the building structure. Therefore, it is necessary to install a sliding bearing between the ceiling surface of the high-rigidity structure and the slab on the upper floor to transmit the vertical load of the upper building structure to the high-rigidity structure while maintaining the separated state.

[0006] In view of this situation, the main problem of the present invention is that a part of the building structure is a high-rigidity structure that is more rigid than the surrounding building structures, and in a building equipped with a seismic isolation layer in which a plurality of seismic isolation devices are arranged, while eliminating the need for excessive reinforcement, to avoid the concentration of horizontal forces on the high-rigidity structure, planar eccentricity, and the generation of large fluctuating axial forces on the seismic isolation devices, and to provide a technology that enables seismic isolation of the entire building including the high-rigidity structure. [Means for Solving the Problems]

[0007] The first characteristic configuration of the present invention is a building in which a part of the building structure is a high-rigidity structure that is more rigid than the surrounding building structures, and is equipped with a seismic isolation layer in which a plurality of seismic isolation devices are arranged, In the building body supported on the seismic isolation layer, the high-rigidity structure and the surrounding building body are provided on the same floor, the upper layer part of the high-rigidity structure is fixed to the surrounding building structure, The surrounding building body on the upper layer side located on the same floor as the upper layer part in and the lower layer part of the high-rigidity structure is supported by the seismic isolation device independently of the surrounding building structure in a state of being separated from the surrounding building structure. The surrounding building body on the lower layer side located on the same floor as the lower layer part in The surrounding building body on the lower layer side located on the same floor as the lower layer part in This is the point.

[0008] According to this configuration, the upper layer portion of the high-rigidity structure is fixed in a state where at least the horizontal relative displacement with respect to the surrounding building structure is blocked, and the lower layer portion of the high-rigidity structure other than the fixed portion is separated from the surrounding building structure in a state where at least the horizontal relative displacement is allowed. By this, the concentration of horizontal forces on the high-rigidity structure and planar eccentricity are avoided. Furthermore, since the lower layer portion of the high-rigidity structure is supported by the seismic isolation device independently of the surrounding building structure from which it is separated, the generation of a large fluctuating axial force on the seismic isolation device is avoided. Therefore, according to the present invention, in a building having a high-rigidity structure in which a part of the building structure is more rigid than the surrounding building structures and having a seismic isolation layer in which a plurality of seismic isolation devices are arranged, it is possible to provide a technology that enables seismic isolation of the entire building including the high-rigidity structure while avoiding the concentration of horizontal forces on the high-rigidity structure, planar eccentricity, and the generation of a large fluctuating axial force on the seismic isolation device without requiring excessive reinforcement.

[0011] The 2 characteristic configuration is A building in which a part of the building body is a high-rigidity structure that is more rigid than the surrounding building body and includes a seismic isolation layer in which a plurality of seismic isolation devices are arranged. The upper layer part of the high-rigidity structure is fixed to the surrounding building body. The lower layer part of the high-rigidity structure is supported by the seismic isolation device independently of the surrounding building body in a state of being separated from the surrounding building body. An overhanging portion on one side and an overhanging portion on the other side of either the lower layer portion of the high-rigidity structure or the surrounding building structure are arranged vertically, and a sliding bearing is interposed between these overhanging portions in a form where one side is supported by the other side.

[0012] According to this configuration, the upper layer part of the high-rigidity structure is fixed in a state where at least the horizontal relative displacement with respect to the surrounding building body is blocked, and the lower layer part of the high-rigidity structure other than the fixing part is separated from the surrounding building body in a state where at least the horizontal relative displacement is allowed. By this, the concentration of horizontal force on the high-rigidity structure and the planar eccentricity are avoided. Furthermore, since the lower layer part of the high-rigidity structure is supported by the seismic isolation device independently of the surrounding building body separated from it, the generation of a large fluctuating axial force on the seismic isolation device is avoided. Therefore, according to the present invention, in a building in which a part of the building body is a high-rigidity structure that is more rigid than the surrounding building body and includes a seismic isolation layer in which a plurality of seismic isolation devices are arranged, it is possible to provide a technology that enables seismic isolation of the entire building including the high-rigidity structure while avoiding the concentration of horizontal force on the high-rigidity structure, planar eccentricity, and the generation of a large fluctuating axial force on the seismic isolation device without requiring excessive reinforcement. Furthermore, According to this configuration, the overhanging portion of the lower layer portion of the high-rigidity structure and the overhanging portion of the surrounding building structure are arranged vertically, and a sliding bearing is interposed between these overhanging portions in a form where one side is supported by the other side. Therefore, while appropriately transmitting the vertical load between the high-rigidity structure and the surrounding building structure through the sliding bearing, the relative displacement along the horizontal direction between them can be smoothly allowed. The third characteristic configuration of the present invention lies in that the high-rigidity structure is a radiation shielding structure that houses a radiation source inside. According to this configuration, it becomes possible to seismic-isolate the radiation shielding structure as the high-rigidity structure, so that the influence of seismic force on the radiation source such as a radiation therapy device housed inside can be suitably suppressed.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0014] Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the building 100 of this embodiment is configured as a hospital building having a radiation therapy room 3 in which a radiation therapy device (not shown) such as a linac, which is a radiation source, is installed. The radiation therapy room 3 is an internal space of a radiation shielding structure 2 for shielding leakage of radiation to the outside. The radiation shielding structure 2 is surrounded by a very high-rigidity radiation shielding wall or the like having a wall thickness of about 1.5 m for shielding transmission of radiation, and is constructed as a high-rigidity structure having higher rigidity than the surrounding building structures 1A and 1B, and is a part of the building structure 1 that constitutes the building 100. In this embodiment, the surrounding building structures 1A and 1B are made of reinforced concrete similar to the radiation shielding structure 2, but may have another structure such as a steel frame structure. In addition, in the building 100, a seismic isolation layer 5 in which a plurality of seismic isolation devices 51 and 52 are arranged is provided on the mat foundation 4, and the entire building structure 1 including the radiation shielding structure 2 and the surrounding building structures 1A and 1B thereof is supported on the seismic isolation layer 5.

[0015] In the building 100 having the radiation shielding structure 2 with higher rigidity than the surrounding building structures 1A and 1B, concentration of horizontal forces such as seismic forces on the radiation shielding structure 2 becomes a problem. Further, in this building, as shown in FIG. 1, since the radiation shielding structure 2 is arranged at a position offset from the center of the building, planar eccentricity of the building 100 becomes a problem. And in order to avoid such problems of concentration of horizontal forces and planar eccentricity, it is desirable to cut off the radiation shielding structure 2 from the surrounding building structures 1A and 1B. When the building 100 of the present embodiment demarcates the radiation shielding structure 2 from the surrounding building structures 1A and 1B, in order to enable seismic isolation of the entire building including the radiation shielding structure 2 while avoiding excessive reinforcement, concentration of horizontal forces on the radiation shielding structure 2, planar eccentricity, and generation of large fluctuating axial forces on the seismic isolation devices 51 and 52, the following will explain the details thereof.

[0016] As shown in FIG. 2, the upper layer portion 2U of the radiation shielding structure 2 is integrated with the upper layer side surrounding building structure 1A, which is the surrounding building structure at the same floor as the upper layer portion 2U. As a result, at least the relative displacement in the horizontal direction of the upper layer portion 2U of the radiation shielding structure 2 with respect to the upper layer side surrounding building structure 1A is blocked. On the other hand, the lower layer portion 2L of the radiation shielding structure 2 other than the fixing portion of the upper layer portion 2U is demarcated from the lower layer side surrounding building structure 1B, which is the surrounding building structure at the same floor as the lower layer portion 2L, in a state where at least relative displacement in the horizontal direction is allowed. The lower layer side surrounding building structure 1B demarcated from the lower layer portion 2L of the radiation shielding structure 2 is supported by the surrounding building structure side seismic isolation device 52. On the other hand, the lower layer portion 2L of the radiation shielding structure 2 is supported by another radiation shielding structure side seismic isolation device 51 independently of the lower layer side surrounding building structure 1B. With such a configuration, the generation of large fluctuating axial forces on the seismic isolation devices 51 and 52 is avoided.

[0017] Furthermore, in the gap portion 7 provided between the lower layer portion 2L of the radiation shielding structure 2 and the surrounding building body 1B on the lower layer portion side, there are provided a radiation shielding structure side overhanging portion 21 that protrudes from the lower layer portion 2L of the radiation shielding structure 2 toward the surrounding building body 1B on the lower layer portion side, and a surrounding building body side overhanging portion 11 that protrudes from the surrounding building body 1B on the lower layer portion side toward the radiation shielding structure 2 side. The radiation shielding structure side overhanging portion 21 and the surrounding building body side overhanging portion 11 are arranged at intervals in the vertical direction. And, a sliding bearing 30 is interposed between the radiation shielding structure side overhanging portion 21 and the surrounding building body side overhanging portion 11 in a form where one side is supported by the other side. With such a configuration, the vertical load transmission between the lower layer portion 2L of the radiation shielding structure 2 and the surrounding building body 1B on the lower layer portion side thereof, which is the surrounding building body, is appropriately performed via the sliding bearing 30, and the relative displacement along the horizontal direction between them is smoothly allowed. Further, in the present embodiment, the radiation shielding structure side overhanging portion 21 is disposed on the lower side, and the surrounding building body side overhanging portion 11 is disposed on the upper side, and the vertical load on the surrounding building body side overhanging portion 11 side is configured to be appropriately transmitted to the radiation shielding structure side overhanging portion 21 via the sliding bearing 30.

[0018] Also, although not shown in the figure, in the gap portion 7 formed between the lower layer portion 2L of the radiation shielding structure 2 and the surrounding building body 1B on the lower layer portion side, an expansion joint that connects the lower layer portion 2L of the radiation shielding structure 2 and the surrounding building body 1B on the lower layer portion side while allowing relative displacement in the horizontal direction can be interposed, and a communication path for going back and forth between them can be provided.

[0019] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of each of the embodiments described below are not limited to being applied alone, and can also be applied in combination with the configurations of other embodiments.

[0020] (1) In the above-described embodiment, an example in which the building according to the present invention is applied to a hospital building provided with a radiation shielding structure 2 that houses a radiation therapy device such as a linac, which is a radiation source, in an internal radiation therapy room 3, as a high-rigidity structure having higher rigidity than the surrounding building structures 1A and 1B, has been described. However, the building according to the present invention can be applied to other buildings than the above-described hospital building as long as it includes, as a part of the building structure, a high-rigidity structure having higher rigidity than the surrounding building structures.

[0021] (2) In the above-described embodiment, the surrounding building structure side overhanging portion 11 is arranged above the radiation shielding structure side overhanging portion 21, and the sliding bearing 30 is interposed therebetween. However, the vertical arrangement of the radiation shielding structure side overhanging portion 21 and the surrounding building structure side overhanging portion 11 may be reversed. Also, such overhanging portions 21, 11 and the sliding bearing 30 may be omitted as appropriate.

Explanation of Reference Numerals

[0022] 1 Building structure 1A Upper layer side surrounding building structure (surrounding building structure) 1B Lower layer side surrounding building structure (surrounding building structure) 2 Radiation shielding structure (high-rigidity structure) 2L Lower layer 2U Upper layer 5 Seismic isolation layer 11 Surrounding building structure side overhanging portion (overhanging portion) 21 Radiation shielding structure side overhanging portion (overhanging portion) 30 Sliding bearing 51 Radiation shielding structure side seismic isolation device (seismic isolation device) 52 Surrounding building structure side seismic isolation device (seismic isolation device) 100 Building

Claims

1. A building having a high-rigidity structure in which a part of the building body is more rigid than the surrounding building body, and having a seismic isolation layer provided with a plurality of seismic isolation devices, wherein in the building body supported on the seismic isolation layer, the high-rigidity structure and the surrounding building body are provided on the same floor, an upper layer portion of the high-rigidity structure is fixed to an upper layer portion side surrounding building body located on the same floor as the upper layer portion in the surrounding building body, a lower layer portion of the high-rigidity structure is supported by the seismic isolation device independently of the surrounding building body in a state of being separated from the lower layer portion side surrounding building body located on the same floor as the lower layer portion in the surrounding building body. A building.

2. A building having a high-rigidity structure in which a part of the building body is more rigid than the surrounding building body, and having a seismic isolation layer provided with a plurality of seismic isolation devices, wherein an upper layer portion of the high-rigidity structure is fixed to the surrounding building body, a lower layer portion of the high-rigidity structure is supported by the seismic isolation device independently of the surrounding building body in a state of being separated from the surrounding building body, wherein an overhanging portion on one side and an overhanging portion on the other side among the lower layer portion of the high-rigidity structure and the surrounding building body are arranged vertically, and a sliding bearing is interposed between these overhanging portions in a form of supporting one side by the other side. A building.

3. The building according to claim 1 or 2, wherein the high-rigidity structure is a radiation shielding structure that houses a radiation source inside.

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