JP2007285078A - Base-isolated building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolated building which does not prevent free relative displacement of upper and lower structures of a base-isolated slit when not submerged and prevents hydraulic water from intruding into the base-isolated slit when submerged by high tide, flooding of rivers or the like. <P>SOLUTION: The base-isolated building has the base-isolated slit near a ground surface GL. A plate 6 for preventing inundation which is continuous with a fin part 5 for preventing the blowing-in of wind and rain is openably closably formed in a gap S between a lower surface of a base-isolated pit closing 3 provided in the upper structure of the base-isolated slit and an opposite upper surface of a base-isolated pit retaining wall 4, or an expandable and contractable elastic tube 12 which closes the gap S by switching to an expansion state is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a base-isolated building having a base-isolated slit (base-isolated layer) near the ground surface. More specifically, the present invention relates to measures for preventing inundation into the base-isolated slit when flooded due to storm surge, river flooding, or the like.

  For example, among the basic seismic isolation building in which the seismic isolation device 1 is provided in the base portion of the building having no basement floor as shown in FIG. 1 or the so-called intermediate seismic isolation building in which the seismic isolation device is provided in the intermediate floor, FIG. An intermediate seismic isolation building with a seismic isolation device 1 between the basement and the first floor as shown in (This is often used when an existing building with a basement is retrofitted to a seismic isolation structure.) Since the seismic isolation slit (base isolation layer) is located near the ground surface GL, a large amount of water with water pressure can enter the seismic isolation slit when the surrounding area of the building is flooded due to storm surges, river flooding, etc. In spite of this, no sufficient measures have been taken in the past.

  That is, in the base isolation building having the base isolation slit near the ground surface GL, the drainage groove 10 is provided outside the retaining wall 4 of the base isolation pit 2 as shown in FIGS. A rubber fin-like wind and rain blowing prevention piece 11 is provided on the lower surface of the seismic isolation pit block (apron covering the upper clearance of the seismic isolation pit 2) 3 provided in the upper structure of the slit. Inundation prevention measures are taken such that rainwater blown into the gap S with the upper surface of the seismic isolation pit retaining wall 4 that faces the inflow is prevented from entering from the wind-and-breathing prevention piece 11 and the water return 4a on the rear side. However, such a wind and rain blowing prevention piece 11 and the drainage groove 10 are almost ineffective against flooding due to storm surges, river flooding, and the like. Therefore, when there is a risk of flooding, only measures such as putting sandbags around the seismic isolation building are taken.

  In Patent Document 1, a rubber fin-like water-resistant material or a tube-like fire-resistant material is provided on the lower end surface of the upper wall of the upper structure of the seismic isolation slit. Although a seismic isolation building that forms a belt and a fireproof zone to prevent intrusion of wind and rain has been disclosed, this water resistant zone and fireproof zone is a technique corresponding to the wind and rain blowing prevention piece 11, and patent literature As shown in FIG. 1, the base-isolated building No. 1 is an intermediate base-isolated building having a base-isolating slit on the floor above the first floor and no need for flooding countermeasures for the base-isolating slit.

JP-A-10-306620

  In view of the above situation, the present invention does not prevent free relative displacement of the lower and upper structures above the seismic isolation slit when not flooded, and when flooded due to storm surges, river flooding, etc., It is intended to provide a seismic isolation building that can prevent entry into the seismic isolation slit.

  In order to solve the above-described problems, the present invention provides a base-isolated building having a base-isolated slit near the ground surface, and a bottom surface of the base-isolated pit block provided in the upper structure of the base-isolated slit and the base-isolated pit facing it. In the gap with the upper surface of the retaining wall, when not flooded, the gap is opened to prevent free relative displacement of the lower structure above the seismic isolation slit. A water shielding device that can be opened and closed is provided (Claim 1).

Specifically, in the invention according to claim 2, in the base isolation building having the base isolation slit near the ground surface, the bottom surface of the base isolation pit block provided in the upper structure of the base isolation slit and the base isolation facing it. One of the upper surface of the pit retaining wall is provided with an inundation prevention plate that is provided with a fin portion that protrudes into the gap between the bottom surface of the seismic isolation pit block and the upper surface of the seismic isolation pit retaining wall to prevent the blowing of wind and rain. The seismic isolation slit is provided so as to be openable and closable between an open state that does not prevent free relative displacement of the lower structure and a closed state that closes the gap and blocks water, and the fin portion protrudes into the gap during non-flooding and The plate is maintained in an open state, and the plate is switched to a closed state when the fin portion receives water pressure during submergence.

  The invention according to claim 3 is the seismic isolation building having the seismic isolation slit near the ground surface, the lower surface of the seismic isolation pit block provided in the upper structure of the seismic isolation slit and the upper surface of the seismic isolation pit retaining wall facing it. Is provided with a wind and rain blowing prevention piece projecting into the gap between the bottom surface of the seismic isolation pit block and the upper surface of the seismic isolation pit retaining wall, and the bottom surface of the seismic isolation pit block and the base isolation plate are located inside the wind and rain blowing prevention piece. An elastic tube that can be switched between an expanded state that shuts off the water by closing the gap on the upper surface of the pit retaining wall and a reduced state that does not prevent free relative displacement of the lower structure is provided above the seismic isolation slit. Is maintained in a contracted state, and pressure fluid supply means for switching to an expanded state during flooding is provided.

  The invention according to claim 4 is the one in which the elastic tube that shields water at the time of flooding is also used as a wind and rain blowing prevention piece at the time of non-flooding (providing a function as a wind and rain blowing prevention piece). In a base-isolated building with a base-isolated slit nearby, one of the bottom surface of the base-isolated pit block provided in the upper structure of the base-isolated slit and the top surface of the base-isolated pit retaining wall facing it It is possible to switch between an expanded state where the gap between the upper surface of the seismic isolation pit retaining wall is closed and water is blocked, and a reduced state above the seismic isolation slit and a free relative displacement of the lower structure. An elastic tube is provided that protrudes into the gap between the bottom surface of the pit block and the upper surface of the seismic isolation pit retaining wall to prevent the blowing of wind and rain. It is characterized in that a fluid supply means.

  According to the present invention, when the water is not flooded, the free relative displacement of the lower structure is not disturbed on the seismic isolation slit, and when flooded due to storm surges, river flooding, etc., water with water pressure enters the seismic isolation slit. There is an effect that can prevent a large amount of infiltration.

  In particular, according to the second aspect of the invention, since the inundation prevention plate is in an open state during non-flooding, the free relative displacement of the upper and lower structures on the seismic isolation slit is not hindered, and the fin portion The normal level of water shielding (prevention of wind and rain) is possible, and during flooding, the infiltration prevention plate is automatically closed by receiving water pressure on the fins, and large amounts of water with water pressure enter. Can be prevented.

  If it is expected that one of the inundation prevention plates adjacent to each other at a right angle at the corner of the base isolation building will not be smoothly switched to the closed state by water pressure, the corner of the base isolation building will be The waterstop wall with an L-shaped wall in plan view that always closes the gap between the bottom surface of the seismic pit block and the seismic isolation pit retaining wall will be installed in a state where it is fixed to one of the lower structures. Because it is a local water blocking wall that is installed only on the part, the contact area of the sliding part is small, and the frictional resistance of the sliding part is extremely small relative to the mass (inertia) of the upper structure, so it is ignored. It is possible. In addition, in the surroundings of seismic isolation buildings, at the entrances and exits where people enter and exit, and the entrances and entrances for cars, sandbags are piled on the surrounding ground to cope with flooding.

According to the third aspect of the present invention, when there is a risk of flooding due to storm surge, river flooding, etc., the pressure fluid supply means such as turning on the start switch of the air pump or the air compressor before actually flooding. Can be artificially operated to expand the elastic tube and close the gap between the bottom surface of the seismic isolation pit and the top surface of the seismic isolation pit retaining wall to prepare for flooding.

  According to the invention described in claim 4, the pressure fluid supply means is artificially operated to inflate the elastic tube, and close the gap between the seismic isolation pit closing lower surface and the seismic isolation pit retaining wall upper surface to prepare for flooding. The non-flooded elastic tube has the function of a wind / rain blowing prevention piece, so that the dedicated wind / rain blowing prevention piece can be omitted, and the cost can be reduced by sharing the members. .

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the seismic isolation device 1 is provided on a base part of a base isolation building having a base isolation slit (base isolation layer) near the ground surface GL, for example, a building having no basement floor as shown in FIG. Of the basic seismic isolation building and the so-called intermediate seismic isolation building with a seismic isolation device on the middle floor, as shown in Fig. 2, the intermediate seismic isolation building with the seismic isolation device 1 between the basement and the first floor 2, the gap S between the lower surface of the seismic isolation pit block (an apron covering the clearance of the seismic isolation pit 2) 3 provided in the upper structure of the seismic isolation slit and the upper surface of the retaining wall 4 of the seismic isolation pit 2 facing it. In addition, when the water is not flooded, the gap S is opened to prevent free relative displacement of the upper and lower structures on the seismic isolation slit, and when flooded, the gap S is closed to prevent water intrusion with water pressure. It is characterized by the provision of a water shielding device.

  Specifically, the bottom surface of the seismic isolation pit block 3 is made of a metal in which a rubber fin portion 5 that protrudes into the gap S between the bottom surface of the seismic isolation pit block and the top surface of the seismic isolation pit retaining wall to prevent wind and rain from blowing. (For example, aluminum, stainless steel, etc.) is provided so that the infiltration prevention plate 6 can be freely opened and closed. When not flooded, the fin portion 5 protrudes into the gap S and the plate 6 As shown in FIG. 3 (B), the plate 6 is automatically switched to the closed state when the fin portion 5 is subjected to water pressure, as shown in FIG. is there.

  That is, the infiltration prevention plate 6 is supported by a base plate 7 embedded and fixed on the lower surface of the seismic isolation pit block 3 so that its upper end is pivotally supported by a horizontal support shaft 8 and is provided around the support shaft 8 ( 3 (A), the state of swinging upward, that is, the open state in which the gap S is opened to prevent free relative displacement of the lower structure above the seismic isolation slit. Is being energized.

  Then, when the water is not flooded, the fin portion 5 protrudes into the gap S and the plate 6 is maintained in an open state, and when the water is flooded, the fin portion 5 receives water pressure, as shown in FIG. The plate 6 is configured to be switched to a closed state in which the gap S is closed and water is blocked. 9a and 9b are rubber packings that seal the upper and lower ends of the plate 6 that has been switched to a closed state during submergence, and 10 is a drainage groove provided on the ground surface GL outside the retaining wall 4.

  According to the above configuration, since the inundation prevention plate 6 is in an open state during non-flooding, it does not hinder the free relative displacement of the upper and lower structures above the seismic isolation slit, and the normal degree of shielding by the fin portion 5 is prevented. Water (prevention of wind and rain) is possible, and at the time of flooding, the infiltration prevention plate 6 is automatically closed by receiving the water pressure on the fin portion 5, and the infiltration of a large amount of water with water pressure can be prevented. .

The fin portion 5 is made of rubber and is connected to the plate 6 at a substantially right angle. When the plate 6 is switched to the closed state, the fin portion 5 is brought into contact with the upper surface of the retaining wall 4, so that FIG. ), The fin portion 5 is also made of metal, and is pivotably supported with respect to the plate 6 and provided around the pivot shaft. The spring may be configured to be biased at a substantially right angle with respect to the plate 6.

  In the corner part of the seismic isolation building, if any one of the flood prevention plates 6 and 6 adjacent to each other at right angles is expected not to be smoothly switched to the closed state due to water pressure, it is not illustrated. In the corner of the base isolation building, the L-shaped wall surface in plan view that always closes the gap S between the bottom surface of the base isolation pit and the top surface of the base isolation pit retaining wall (when the inundation prevention plates 6 and 6 are switched to the closed state, What is necessary is just to install the water stop wall which has the surface which receives the end part back surface in the state fixed to one side of the upper and lower structures. In this case, since it is a local water blocking wall installed only in the corner portion, the contact area of the sliding portion is small, and the frictional resistance of the sliding portion is extreme with respect to the mass (inertia) of the upper structure 1. Can be ignored. In addition, in the surroundings of seismic isolation buildings, at the entrances and exits where people enter and exit, and the entrances and entrances for cars, sandbags are piled on the surrounding ground to cope with flooding.

  4 (A) and 4 (B) show another embodiment of the present invention. Of the lower surface of the seismic isolation pit block 3 and the upper surface of the retaining wall 4 of the seismic isolation pit 2 facing the seismic isolation pit 2, FIG. A metal fin (for example, aluminum, stainless steel) is provided on the upper surface of the retaining wall 4 and a rubber fin portion 5 that protrudes into a gap S between the bottom surface of the seismic isolation pit block and the upper surface of the seismic isolation pit retaining wall to prevent wind and rain from blowing. Steel or the like) is provided so as to be openable and closable. At the time of non-flooding, as shown in FIG. 4 (A), the fin portion 5 projects into the gap S and the plate 6 is maintained in an open state. At the time of submergence, as shown in FIG. 4B, the plate 6 is automatically switched to a closed state when the fin portion 5 receives water pressure.

  That is, the infiltration prevention plate 6 is pivotally supported by a base plate 7 embedded and fixed on the upper surface of the retaining wall 4 of the seismic isolation pit 2 so that the inner end is swingable by a horizontal support shaft 8 and around the support shaft 8. As shown in FIG. 4 (A), the spring (not shown) and its own weight swing downward, that is, the gap S is opened and the upper and lower structures are freed up. It is biased to an open state that does not prevent relative displacement.

  At the time of submergence, the fin 5 receives water pressure, so that the plate 6 is switched to a closed state in which the gap S is closed and water is blocked as shown in FIG. 4B. . The fin portion 5 is desirably made of rubber, but may be made of metal or integrally formed with the plate 6. Other configurations and operations are the same as those in the embodiment of FIG.

  5A and 5B show another embodiment of the present invention. In this embodiment, in the base isolation building having the base isolation slit near the ground surface GL, the bottom surface of the base isolation pit block 3 provided in the upper structure of the base isolation slit, and the top surface of the base isolation pit retaining wall 4 facing it One of them is provided with a wind and rain blowing prevention piece 11 made of rubber that protrudes into the gap S between the bottom face of the seismic isolation pit block and the upper face of the seismic isolation pit retaining wall, and inside the wind and rain blowing prevention piece 11, An elastic tube that can be switched between an expanded state that closes the gap S between the bottom surface of the seismic isolation pit block and the upper surface of the seismic isolation pit retaining wall, and a reduced state that does not prevent free relative displacement of the lower structure above the seismic isolation slit 12, when not flooded, the elastic tube 12 is maintained in a contracted state as shown in FIG. 5 (A), and when flooded, pressure fluid supply is switched to the expanded state as shown in FIG. 5 (B). Means (for example, air A pump or air compressor is characterized in that provided constituted.) By compressed air introduction pipe 13 and the like. 4 a is a water return formed on the upper surface of the retaining wall 4 and in the vicinity of the back surface of the wind / storm blowing prevention piece 11.

According to the above configuration, since the elastic tube 12 is in a contracted state at the time of non-flooding, it does not prevent free relative displacement of the upper and lower structures on the seismic isolation slit, and to some extent due to the wind and rain blowing prevention piece 11. In case there is a risk of inundation (prevention of wind and rain) and flooding due to storm surges, river flooding, etc., pressure fluid such as turning on the start switch of the air pump or air compressor before actually flooding The supply means can be artificially operated to inflate the elastic tube 12 to close the gap S between the seismic isolation pit closing lower surface and the seismic isolation pit retaining wall upper surface to prepare for flooding.

  6 (A) and 6 (B) show another embodiment of the present invention. This embodiment is characterized in that the elastic tube 12 that shields water at the time of flooding is also used as a wind and rain blowing prevention piece at the time of non-flooding (having a function as a wind and rain blowing prevention piece). That is, in the base isolation building having the base isolation slit near the ground surface GL, one of the lower surface of the base isolation pit block 3 provided in the upper structure of the base isolation slit and the upper surface of the base isolation pit retaining wall 4 facing it. Furthermore, it is possible to switch between an expanded state in which the gap S between the bottom surface of the seismic isolation pit block and the upper surface of the seismic isolation pit retaining wall is closed and water is blocked, and a reduced state in which the relative structure of the lower structure is not obstructed above the seismic isolation slit. In the reduced state, an elastic tube 12 that protrudes into the gap between the bottom surface of the seismic isolation pit block and the top surface of the seismic isolation pit retaining wall to prevent the blowing of wind and rain is provided, and is shown in FIG. As shown in FIG. 6B, the elastic tube 12 is maintained in a contracted state, and as shown in FIG. 6B, the pressure fluid supply means (for example, an air pump or an air compressor, Constituted by the air introduction pipe 13 and the like.) In which the provided.

  According to the above configuration, the pressure fluid supply means is artificially operated to expand the elastic tube 12, and the gap S between the bottom surface of the seismic isolation pit block 3 and the top surface of the seismic isolation pit retaining wall 4 is closed to prepare for flooding. In addition, the elastic tube 12 that is in a contracted state when it is not flooded has the function of the wind and rain blowing prevention piece 11 described above, so that the dedicated wind and rain blowing prevention piece 11 can be omitted, and the cost can be reduced by combining the members. Is possible. Other configurations and operations are the same as those in the embodiment of FIG.

  In both of the embodiments shown in FIGS. 5 and 6, an elastic tube is formed on the lower surface of the seismic isolation pit block 3 out of the lower surface of the seismic isolation pit block 3 and the upper surface of the retaining wall 4 of the seismic isolation pit 2 facing it. 12, and a compressed air introduction pipe 13 is embedded in the seismic isolation pit block 3. On the contrary, an elastic tube 12 is provided on the upper surface of the seismic isolation pit retaining wall 4, It is also possible to carry out by embedding the compressed air introduction pipe 13.

It is a schematic longitudinal cross-sectional view of the base isolation building which has a base isolation slit near the ground surface. It is a schematic longitudinal cross-sectional view of the middle seismic isolation building which has a seismic isolation slit near the ground surface. It is the longitudinal cross-sectional view of the principal part in the normal time and the time of flooding which shows embodiment of this invention. It is a longitudinal cross-sectional view of the principal part at the time of the normal time and submergence which show other embodiment. It is a longitudinal cross-sectional view of the principal part at the time of the normal time and submergence which show other embodiment. It is a longitudinal cross-sectional view of the principal part at the time of the normal time and submergence which show other embodiment. It is a longitudinal cross-sectional view explaining a prior art example. It is a principal part enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Seismic isolation pit 3 Seismic isolation pit block 4 Seismic isolation pit retaining wall 5 Fin part 6 Infiltration prevention plate 11 Wind and rain blowing prevention piece 12 Elastic tube

Claims (4)

  In seismic isolation buildings with seismic isolation slits near the ground surface, the gap between the lower surface of the seismic isolation pit block provided in the upper structure of the seismic isolation slit and the upper surface of the seismic isolation pit retaining wall facing it, Provided an openable / closable water-blocking device that opens the gap and does not prevent free relative displacement of the lower structure above the seismic isolation slit and closes the gap during flooding to prevent water from entering under water pressure. A seismically isolated building.   In a base-isolated building having a base-isolated slit near the ground surface, the base-isolated pit is placed on one of the bottom surface of the base-isolated pit block provided in the upper structure of the base-isolated slit and the top surface of the base-isolated pit retaining wall facing it. An inundation prevention plate with a fin that is connected to the bottom surface of the seismic isolation pit and the upper surface of the seismic isolation pit retaining wall to prevent wind and rain from blowing in, is open relative to the structure below the seismic isolation slit. It is provided so as to be openable and closable between an open state that does not prevent displacement and a closed state that closes the gap and blocks water, and the fin portion projects into the gap and the plate is kept open when not flooded, and the fin portion when flooded. The seismic isolation building, wherein the plate is switched to a closed state by receiving water pressure.   In a base-isolated building having a base-isolated slit near the ground surface, the base-isolated pit is placed on one of the bottom surface of the base-isolated pit block provided in the upper structure of the base-isolated slit and the top surface of the base-isolated pit retaining wall facing it. A wind and rain blowing prevention piece that protrudes into the gap between the bottom surface of the block and the seismic isolation pit retaining wall is provided, and the gap between the bottom surface of the seismic isolation pit block and the top surface of the seismic isolation pit retaining wall is closed inside the wind blowing prevention piece. An elastic tube is provided that can be switched between an expanded state that is water-blocking and a reduced state that does not prevent free relative displacement of the lower structure above the seismic isolation slit, and the elastic tube is maintained in a reduced state when it is not flooded. A base-isolated building provided with pressure fluid supply means for switching to an expanded state.   In a base-isolated building having a base-isolated slit near the ground surface, the base-isolated pit is placed on one of the bottom surface of the base-isolated pit block provided in the upper structure of the base-isolated slit and the top surface of the base-isolated pit retaining wall facing it. It is possible to switch between an expanded state in which the gap between the closed bottom surface and the upper surface of the seismic isolation pit retaining wall is closed and water is blocked, and a contracted state above the seismic isolation slit and a reduced state that does not prevent free relative displacement of the lower structure. An elastic tube is provided that protrudes into the gap between the bottom surface of the seismic isolation pit block and the upper surface of the seismic isolation pit retaining wall to prevent the blowing of wind and rain. A base-isolated building provided with pressure fluid supply means for switching.

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