JP2018178490A - Seismic isolation building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic isolated building having a seismic isolation structure having a simple structure which is not affected by the amount of water when the periphery of the building is flooded and which does not impair the seismic isolation function. SOLUTION: A foundation portion 20 constructed in the ground, a building body 10 provided above the foundation portion, a seismic isolation layer 30 provided between the foundation portion and the building body, and a seismic isolation layer. In a seismic isolation building provided with a seismic isolation device 40 provided and a inundation prevention structure 50 provided in the seismic isolation layer, the inundation prevention structure is rotatable around the plate 53 and one end of the plate as a foundation. It has a hinge 52 connected to the above, a seal member 54 provided at the other end of the plate, and a floating body 55 capable of supporting the seal member on water by buoyancy. [Selection diagram] Fig. 2

Description

  The present invention relates to a seismic isolation building.

  In the past, it has been known that a seismic isolation building does not directly transmit seismic vibrations to the superstructure by providing a seismic isolation device (for example, a laminated rubber bearing) between the substructure (for example, base portion) and the superstructure. There is.

  In such a base-isolated building, a large amount of water flows into the gap between the lower structure and the upper structure when the area around the building is flooded due to heavy rain, tsunami, river flooding, etc., which hinders the operation of the base isolation system. There is a risk that the building may become unstable due to the possibility of the buoyancy of the upper structure and the risk of the building being overwhelmed.

  On the other hand, it is known to provide a water immersion prevention structure between the lower structure and the upper structure (see, for example, Patent Document 1).

  In the water immersion prevention structure described in Patent Document 1, the water immersion prevention plate closes the gap between the upper structure and the lower structure by receiving water pressure in the fin portion, and a large amount of water having water pressure is infiltrated. It can be prevented.

  However, with such a water immersion prevention structure, when the water depth is shallow, sufficient water pressure does not act on the fins, so the water immersion prevention plate can not close the gap between the upper structure and the lower structure, preventing water immersion. There is a problem that can not be

  There is also known a configuration in which the pressure fluid supply means is artificially operated to expand the elastic tube and close the gap between the upper structure and the lower structure (see, for example, Patent Document 1).

  However, such a flood protection structure requires human manipulation in order to operate the pressure fluid supply means. At the time of submersion, the site is disturbed, and in manual operation, the pressure fluid supply means can not be operated calmly and properly, and there is a problem that the inundation prevention can not be achieved. In addition, it is necessary to maintain the pressure fluid supply means, which takes time and effort.

  Moreover, the structure which provides the waterproof cover which has flexibility between an upper structure and a lower structure as a water immersion prevention structure is known (for example, refer patent document 2).

  However, since the waterproof cover is fixed to the upper structure and the lower structure, such a water immersion prevention structure may hinder the function of the seismic isolation device.

Unexamined-Japanese-Patent No. 2007-285078 JP, 2013-249711, A

  The present invention is a simple structure inundation prevention structure that is not affected by the amount of water when the area around the building is flooded and does not require human operations, and is an isolation structure that has the inundation prevention structure that does not interfere with the seismic isolation function. The purpose is to provide a quake building.

  In order to achieve the above object, the base isolation building of the present invention comprises a lower structure constructed in the ground, an upper structure provided above the lower structure, and a space between the lower structure and the upper structure. In a seismic isolation building provided with a seismic isolation layer provided, a seismic isolation device provided in the seismic isolation layer, and a flood prevention structure provided in the seismic isolation layer, the flood prevention structure has a plate shape. A member capable of supporting the seal member on water by means of buoyancy, a hinge for pivotally connecting one end of the plate member to the lower structure, a seal member provided at the other end of the plate member, and buoyancy And a floating body.

  The distance between the hinge and the seal member may be longer than the thickness of the seismic isolation layer.

  Further, a water immersion prevention layer different from the seismic isolation layer is provided between the upper structure and the lower structure, the water immersion prevention layer is provided with the water immersion prevention structure, and the thickness of the water immersion prevention layer is The thickness may be shorter than the thickness of the seismic isolation layer.

  In addition, a waterproof sheet may be provided to cover the vicinity of the hinge.

  In the seismic isolation building configured in this way, the inundation prevention structure provided in the seismic isolation layer moves pivotably through the hinge due to the buoyancy of the floating body, thereby preventing inundation according to the water level at the time of inundation It is possible to change the attitude of the structure. Therefore, it is possible to provide a seismic isolation building having a simple structure in which the inundation prevention structure is not affected by the amount of water when the area around the building is flooded. In addition, the non-water immersion structure and the small amount of water immersion may be configured not to abut the upper structure. Therefore, the inundation prevention structure does not disturb the seismic isolation function of the seismic isolation device.

  Further, by configuring the distance between the hinge and the seal member to be longer than the thickness of the seismic isolation layer, the flood prevention structure can block the seismic isolation layer when a large amount of water is flooded. Therefore, even when a large amount of water is flooded, water can not reach the seismic isolation device. As a result, it is possible to prevent the operation of the seismic isolation system from being hindered.

  In addition, by configuring the thickness of the water immersion prevention layer to be shorter than the thickness of the seismic isolation layer, the water immersion prevention structure can be operated with less water pressure. Therefore, the inundation prevention structure can be reliably operated, and the water can not be reliably reached the seismic isolation device. As a result, the operation of the seismic isolation system can be further prevented.

  Moreover, by setting it as the structure which covers the vicinity of a hinge with a waterproof sheet, the water leak from the hinge which has a movable structure which can be easily flooded can be suppressed. Therefore, it is possible to more reliably prevent inundation.

It is a schematic block diagram which shows an example of the seismic isolation building which concerns on 1st Embodiment of this invention. It is an explanatory view explaining a flood control structure concerning a 1st embodiment. It is an explanatory view explaining the state at the time of non-flooding of the flood prevention structure concerning a 1st embodiment. It is explanatory drawing explaining the state at the time of the small amount water immersion of the water immersion prevention structure which concerns on 1st Embodiment. It is an explanatory view explaining the state at the time of a large amount of water flood of a flood prevention structure concerning a 1st embodiment. It is a schematic block diagram explaining the structure of the connection part of each water immersion prevention unit of the water immersion prevention structure which concerns on 1st Embodiment. It is an explanatory view explaining the inundation prevention structure of the seismic isolation building concerning a 2nd embodiment.

First Embodiment
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1: is a schematic block diagram which shows an example of the seismic isolation building which concerns on 1st Embodiment of this invention.

  As shown in FIG. 1, the seismic isolation building 1 includes a building main body 10 which is an example of a superstructure of a multi-story floor structure, a base portion 20 as a lower structure provided below the building main body 10, and the building main body 10 And a seismic isolation layer (gap) 30 provided between the base portion 20 and the base portion 20.

  In addition, the scale, shape, etc. of the seismic isolation building 1 are not limited. Further, the position of the seismic isolation layer 30 is not limited to between the building body 10 and the base portion 20. The seismic isolation building 1 may be a building provided with an underground structure.

  The building body 10 has a plurality of columns 11, 11,... And slabs 12, 12,.

  The slabs 12 are provided on each level of the building body 10. At the lower end of the building body 10, a lower end slab 13 is provided to connect the lower ends of the columns 11 with each other.

  The lower end slab 13 is formed at a position dug deeper than the ground surface. In addition, the position of the lower end slab 13 is not limited to this aspect.

  The building body 10 has a rectangular shape in plan view. In addition, the shape of the building main body 10 is not limited to this aspect. Further, the number of levels of the building main body 10 is not limited to this.

  The base portion 20 is a plate-like member formed in the ground and below the lower end slab 13, and formed in a rectangular shape in plan view according to the planar shape of the building main body 10. The thickness (height) of the base portion 20 may be appropriately set in accordance with the size of the seismic isolation building 1.

  The seismic isolation layer 30 is provided with a plurality of seismic isolation devices 40. The seismic isolation device 40 is provided at a place other than the vicinity of the outer periphery of the lower end slab 13. The lower end slab 13 is mounted on the seismic isolation device 40.

  Although the structure of the seismic isolation apparatus 40 employ | adopts laminated rubber bearing, it is not limited to this aspect.

  Next, the water immersion prevention structure according to the first embodiment will be described. FIG. 2 is an explanatory view for explaining the water immersion prevention structure according to the first embodiment. Drawing 3 is an explanatory view explaining the state at the time of non-flooding of the flood prevention structure concerning a 1st embodiment. Drawing 4 is an explanatory view explaining the state at the time of a small amount of time flood of water immersion prevention structure concerning a 1st embodiment. Drawing 5 is an explanatory view explaining the state at the time of a large amount of water flood of a flood prevention structure concerning a 1st embodiment. FIG. 6 is a schematic configuration view illustrating the configuration of the connection portion of each water immersion prevention unit of the water immersion prevention structure according to the first embodiment.

First, the configuration of the water immersion prevention structure according to the present embodiment will be described.
The inundation preventing structure 50 is provided on the seismic isolation layer 30 as shown in FIGS. 1 and 2. In the present embodiment, the water immersion prevention structure 50 has four water immersion prevention units 51. The four inundation prevention units 51 are respectively disposed on each side of the building body 10 having a rectangular shape in a plan view. The connection portion with each water immersion prevention unit 51 is provided with a waterproof waterproof member described later. Thereby, the water immersion prevention structure 50 is provided on the outer peripheral side of the lower end slab 13 with respect to the seismic isolation device 40 over the entire periphery. In addition, the inundation prevention structure 50 is not limited to the aspect which has four inundation prevention units, According to the shape of the building main body 10, and the installation position of the seismic isolation apparatus 40, it can change suitably.

  Since each water immersion prevention unit 51 has the same configuration, one water immersion prevention unit 51 will be described.

  As shown in FIG. 3, the water immersion prevention unit 51 has a plate 53 which is a plate-like member, a hinge 52, a seal member 54, a floating body 55, and a waterproof sheet 56.

  The plate 53 is made of a light metal such as aluminum and is a plate-like member extending along one outer peripheral edge of the lower end slab 13 having a rectangular shape in a plan view. The plate 53 is rotatably connected to the base portion 20 via a hinge 52 fixed to the base portion 20.

  A seal member 54 is provided at the end of the plate 53 opposite to the side connected to the base portion 20 in the short direction (direction orthogonal to the longitudinal direction). The seal member 54 is an elastic member such as rubber, for example.

  The seal member 54 is supported by the floating body 55. The floating body 55 has a density floating in water, and is configured to have buoyancy by, for example, enclosing a gas inside the floating body. The buoyancy of the floating body 55 is larger than the weight of the water immersion prevention unit 51. The floating body 55 is fixed at a position in contact with the base portion 20 side of the seal member 54 in a plane parallel to the plane of the plate 53. Thereby, the floating body 55 can support the seal member 54 on water by buoyancy.

  The waterproof sheet 56 is flexible and extends along the four flood prevention units 51 to cover the hinge 52 and the periphery thereof. The waterproof sheet 56 is formed of a water-impermeable material, such as a thermoplastic elastomer material.

  A flexible waterproof member 60 is provided at the longitudinal end of the water immersion prevention unit 51. Each water immersion prevention unit 51 is connected via a waterproof member 60. The waterproof member 60 is, for example, a rubber sheet-like member, and is stretchable. Thereby, the waterproof member 60 can follow the movement of each water immersion prevention unit 51. Therefore, it is possible to prevent water immersion from between the water immersion prevention units 51.

  Next, the operation of the flooded waterproof structure according to the present embodiment will be described.

(When not flooded)
As shown in FIG. 3, in the non-flooded state (normal time), since the floating force does not act on the floating body 55, the inundation prevention unit 51 is in a posture of falling to the base portion 20 side by its own weight. Thereby, the gap between the base portion 20 and the lower end slab 13 is sufficiently secured. Therefore, the operation of the seismic isolation device 40 can be prevented from being inhibited.

(When a small amount is flooded)
As shown in FIG. 4, when a small amount of water is flooded, a small amount of water W will flow into the seismic isolation layer 30 between the lower end slab 13 and the base portion 20. When the water W flowing into the seismic isolation layer 30 reaches the inundation preventing unit 51, the floating force acts on the floating body 55, and the inundation preventing unit 51 moves from the base portion 20 side to the lower end slab 13 side with the hinge 52 as a rotation axis. Rotate. Thereby, the water immersion prevention unit 51 can be raised to the water immersion position. Therefore, even when a small amount of water is flooded, the water W can not reach the seismic isolation device 40, and a gap between the base portion 20 and the lower end slab 13 can be secured. As a result, the operation of the seismic isolation device 40 can be prevented from being inhibited.

(When a large amount of water is flooded)
As shown in FIG. 5, when a large amount of water is flooded, a large amount of water W flows into the seismic isolation layer 30 between the lower end slab 13 and the base portion 20.

  Here, the length L of the short direction (the distance between the hinge 52 and the seal member 54) of the water immersion prevention unit 51 is the distance between the lower surface of the lower end slab 13 and the upper surface of the base portion 20 Thickness of 30) longer than D.

  When the water W flowing into the seismic isolation layer 30 reaches the inundation preventing unit 51, the floating force acts on the floating body 55, and the inundation preventing unit 51 moves from the base portion 20 side to the lower end slab 13 side with the hinge 52 as a rotation axis. Rotate. When the water level of the water W flowing into the seismic isolation layer 30 reaches the lower surface of the lower end slab 13, the inundation preventing unit 51 uses the hinge 52 as a rotation axis and the seal member 54 serves as the lower end slab 13. Rotate until it abuts on the Thereby, the inundation prevention unit 51 can block the seismic isolation layer 30 between the lower end slab 13 and the base portion 20. Therefore, even when a large amount of water is flooded, the water W can not reach the seismic isolation device 40. As a result, the operation of the seismic isolation device 40 can be prevented from being inhibited.

  During a small amount of water immersion and a large amount of water immersion, the water W flowing into the seismic isolation layer 30 between the lower end slab 13 and the base portion 20 is drained through a well-known drainage port provided in the base portion 20. When the water W flowing into the seismic isolation layer 30 is drained, buoyancy does not act on the floating body 55. Therefore, as shown in FIG. 3, the inundation preventing unit 51 falls to the base portion 20 side by its own weight. Become. Thereby, the inundation prevention unit 51 can automatically move from the attitude in the case of a small amount of inundation or the attitude in the case of a large amount of inundation to the attitude in the case of no inundation.

Next, the operation of the present embodiment will be described.
In the seismic isolation building 1 configured as described above, the water immersion prevention structure 50 provided in the seismic isolation layer 30 is rotatably moved via the hinge 52 by the buoyancy of the floating body 55, whereby the water level at the time of flooding is obtained. Accordingly, the posture of the water immersion prevention structure 50 can be changed.

At the time of non-water immersion, the water immersion prevention unit 51 can be in a posture in which it falls to the base portion 20 side. Therefore, the gap between the base portion 20 and the lower end slab 13 can be sufficiently secured.
When a small amount of water is flooded, buoyancy acts on the floating body 55, and the water immersion prevention unit 51 can be raised to the water immersion position. Therefore, even when a small amount of water is flooded, the water W can not reach the seismic isolation device 40, and a gap between the base portion 20 and the lower end slab 13 can be secured.
At the time of a large amount of water immersion, the water immersion prevention unit 51 can be rotated via the hinge 52 until the seal member 54 abuts on the lower end slab 13. Therefore, when a large amount of water is flooded, it is possible to block the seismic isolation layer 30 and prevent the water W from reaching the seismic isolation device 40 by the flood prevention unit 51.

  As a result, it is possible to provide the seismic isolation building 1 having the inundation prevention structure 50 of a simple configuration that is not affected by the amount of water (inundation scale) when the area around the building is flooded. In addition, the non-water immersion structure 50 may not be in contact with the building body 10 during non-water immersion and when a small amount of water immersion. As a result, the inundation prevention structure 50 does not inhibit the seismic isolation function of the seismic isolation device 40.

  Further, the water immersion prevention structure 50 mainly includes the plate 53, the hinge 52, the seal member 54, and the floating body 55. Thereby, the water immersion prevention structure 50 can be made into a simple structure. Moreover, when attaching the inundation prevention structure 50 to the seismic isolation building 1, it can be set as simple construction.

  Moreover, since the inundation prevention structure 50 can be set to the posture which fell down to the base part 20 side at the time of non-flooding, access to the seismic isolation apparatus 40 of a worker becomes easy, and maintenance and management of the seismic isolation apparatus 40 be simplified. Can.

  Further, by changing the posture of the water immersion prevention structure 50 by utilizing the buoyancy of the floating body 55, a simple configuration that does not require the power of a motor or the like can be obtained. Therefore, it is not necessary to require special maintenance which is required by providing power such as a motor.

  Further, by covering the vicinity of the hinge 52 with the waterproof sheet 56, it is possible to suppress water leakage from the hinge 52 having a movable structure which is easily flooded. Therefore, it is possible to more reliably prevent water immersion.

Second Embodiment
Next, a seismic isolation building according to the second embodiment will be described. FIG. 7 is an explanatory view for explaining the inundation preventing structure of the seismic isolation building according to the second embodiment.

  The base-isolated building according to the second embodiment differs from the base-isolated building according to the first embodiment in the position where the inundation prevention structure is installed.

  As shown in FIG. 7, the lower end slab 130 has a recess 130 a on the lower surface of the lower end slab 130 near the outer periphery of the lower end slab 130. The base portion 200 has a convex portion 200 a on the upper surface of the base portion 200 corresponding to the concave portion 130 a. A water immersion prevention layer 300 is formed between the recess 130 a and the protrusion 200 a. A seismic isolation device 40 is provided in the seismic isolation layer 30 between the lower end slab 130 and the base portion 200. A water immersion prevention structure 500 is provided in the water immersion prevention layer 300 between the concave portion 130 a and the convex portion 200 a. The length L ‘in the short direction of the water immersion prevention structure 500 is longer than the distance D (thickness of the water immersion prevention layer 300) between the concave portion 130a and the convex portion 200a. The thickness D ‘of the water immersion prevention layer 300 is set shorter than the thickness D of the seismic isolation layer 30 of the first embodiment. The short side length L ‘of the water immersion prevention structure 500 is set to be shorter than the short direction length L of the water immersion prevention structure 50 of the first embodiment.

  Thereby, the water immersion prevention structure 500 can be operated with less water pressure. Therefore, the water immersion prevention structure 500 can be operated reliably, and the water W can not be reliably reached the seismic isolation device 40. As a result, the operation of the seismic isolation apparatus 40 can be further inhibited.

  As mentioned above, although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the design change to the extent not departing from the gist of the present invention Included in the invention.

1 Seismically isolated building 10 Building body (an example of a superstructure)
20 foundation part (an example of lower structure)
Reference Signs List 30 seismic isolation layer 40 seismic isolation device 50 inundation preventing structure 52 hinge 53 plate (an example of plate member)
54 seal member 55 floating body 56 tarpaulin 300 water immersion prevention layer

Claims (4)

The substructure built in the ground,
An upper structure provided above the lower structure;
A seismic isolation layer provided between the lower structure and the upper structure;
A seismic isolation device provided in the seismic isolation layer;
In the seismic isolation building provided with the inundation prevention structure provided in the seismic isolation layer,
The inundation prevention structure is
Plate member,
A hinge rotatably connecting one end of the plate member to the lower structure;
A sealing member provided at the other end of the plate-like member;
A base isolation building comprising: a floating body capable of supporting the seal member on water by buoyancy.   The base isolation building according to claim 1, wherein a distance between the hinge and the seal member is longer than a thickness of the base isolation layer. Between the upper structure and the lower structure, a water immersion prevention layer separate from the seismic isolation layer is provided.
The water immersion prevention layer is provided with the water immersion prevention structure,
The base isolation building according to claim 1, wherein a thickness of the inundation prevention layer is smaller than a thickness of the seismic isolation layer.   The seismic isolation building according to any one of claims 1 to 3, further comprising a waterproof sheet covering the vicinity of the hinge.