JP2007146419A - Base-isolation foundation structure of building, and construction method for base-isolation foundation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolation foundation structure of a building, which enables a building foundation to be inexpensively constructed by simplifying the structure and facilitating construction work. <P>SOLUTION: The base-isolation foundation structure of the building is characterized as follows: isolators 3 are arranged at four corners, respectively; foamed synthetic resin blocks 4 are arranged in portions except the isolators 3, respectively; and the concrete building foundation 5 is arranged on the top surfaces of them, and connected to the isolators 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a base isolation structure for a building and a base isolation base construction method.

  As a base isolation structure for a building, the foundation of the building is supported on the ground via an isolator and a damper, and the space other than the isolator and damper is filled with crushed stone and earth and sand. In addition to absorbing seismic energy, the building is supported when the isolator and damper are damaged by crushed stone or earth and sand, and the vertical movement (rolling) of the building is reduced (for example, patent document) 1).

JP 2002-201816 A (refer to FIG. 1 and FIG. 2)

  In such a base-isolated structure, spaces other than isolators and dampers are filled with crushed stone or earth and sand, but they must be cut off from the foundation of the building. This is difficult, and it is necessary to install steel pipes around them to prevent crushed stone or earth and sand from entering the isolator and damper, which increases the construction cost.

  The present invention has been made in view of the actual circumstances of the background art described above, and its purpose is to construct a building foundation at low cost by simplifying the structure and facilitating the construction work. The purpose is to provide a seismic isolation base structure and a base isolation method for building that can be used.

In order to achieve the above object, the base isolation structure for a building according to claim 1 has isolators arranged at four corners, foamed synthetic resin blocks are arranged at portions excluding the isolators, and a concrete construction is provided on the upper surface thereof. An object foundation is disposed, and the building foundation is connected to the isolator.
Here, as a building constructed on the seismic isolation foundation, it can be applied not only to buildings such as buildings, houses, warehouses, but also to measurement rooms or buildings that use equipment such as precision instruments. Further, the isolator can be arranged not only at the four corners of the building foundation but also at other locations.

Further, the seismic isolation base structure of a building according to claim 2 is the invention according to claim 1, wherein the reinforcing bar of the isolator in which the reinforcing bar is erected upward is used as the reinforcing bar arranged on the building foundation. It connects, The said building foundation was connected to the said isolator, It is characterized by the above-mentioned.
Here, the reinforcing bars erected on the isolator and the reinforcing bars arranged on the building foundation are coupled to each other by welding, connection or the like.

Further, in order to achieve the above-described object, the building seismic isolation foundation construction method according to claim 3 arranges the isolator at the four corners, arranges the foamed synthetic resin block at a portion excluding the isolator, the isolator and the After placing the mold so as to surround the foamed synthetic resin block, concrete is placed in a space defined by the isolator and the upper surface of the foamed synthetic resin block and the mold to construct a building foundation. It is characterized by that.
Here, the arrangement of the isolator, the arrangement of the foamed synthetic resin block, and the arrangement of the formwork may be performed first.

According to a fourth aspect of the present invention, there is provided a seismic isolation foundation construction method comprising the steps of: It is characterized by connecting.
Here, the reinforcing bars erected on the isolator and the reinforcing bars arranged on the building foundation are coupled to each other by welding, connection or the like.

In the base isolation structure for a building according to the first aspect of the present invention, the vibration of the ground is absorbed by the isolator and is suppressed by the foamed synthetic resin block.
Therefore, according to the present invention, even when the isolator is damaged, the building can be supported by the foamed synthetic resin block, and since no special damper is required, it can be constructed at low cost.

  Moreover, according to the seismic isolation base structure of a building according to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, since the isolator and the building foundation are coupled by a reinforcing bar, they are Strong coupling is maintained over a long period of time, and a stable seismic isolation effect can be obtained.

  Further, according to the above-described method for building a seismic isolation foundation for a building according to the third aspect of the present invention, the bottom formwork of concrete is formed by the isolator and the foamed synthetic resin block, and it is necessary to remove the bottom formwork after the construction. Because there is no, building foundation can be built easily.

  Moreover, according to the above-described method for building a seismic isolation foundation for a building according to the present invention of claim 4, in addition to the effect of the invention of claim 3, the isolator and the building foundation can be easily and reliably coupled. .

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a base isolation structure for a building and a base isolation base construction method according to the present invention described above will be described in detail with reference to the drawings.

  Here, FIG. 1 is a perspective view conceptually showing a base isolation structure for a building according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIGS. 3 and 4 These are the perspective views which showed the procedure which builds the seismic isolation foundation of the building based on this invention, FIG. 5: is sectional drawing of the part in alignment with the BB line in FIG.

  In the seismic isolation base 1 shown in the figure, the isolator 3 is arranged at the four corners on the ground foundation 2 formed on the ground, and the foamed synthetic resin block 4 is arranged at a portion excluding the isolator 3, and the concrete building is formed on the upper surface thereof. A foundation 5 is provided.

  The isolator 3 and the foamed synthetic resin block 4 may be directly installed on the ground, but are preferably installed on the flat ground foundation 2 formed by placing concrete on the ground. If necessary, it is supported by piles placed in the ground.

  Examples of the foamed synthetic resin block 4 include those obtained by foaming a resin such as polystyrene, polyethylene, polypropylene, polyurethane, and polyvinyl chloride. Among them, a polystyrene resin that is inexpensive and has low strength and high strength. The foam of the foamed synthetic resin block 4 is preferably one having independent bubbles in consideration of water resistance, strength and the like.

The foamed synthetic resin block 4 preferably has a density of 0.01 to 0.05 g / cm ³ from the viewpoints of strength and economy. The size is preferably 100 to 200 cm in length, 50 to 150 cm in width, and 30 to 100 cm in height from the viewpoint of workability, etc., and arranged in a vertically and horizontally aligned state or a staggered state (one foam synthesis) The resin block is arranged in a state where the side ends of the other foamed synthetic resin block meet in the middle of one side of the resin block.

The seismic isolation foundation 1 as described above is constructed as follows.
First, as shown in FIG. 3, the ground foundation 2 is constructed by placing concrete on the ground. Next, the isolator 3 is installed at positions corresponding to the four corners of the building foundation 5.

Next, as shown in FIG. 4, foamed synthetic resin blocks 4 are laid on portions corresponding to the building foundation 5 excluding the isolator 3, and they are connected to each other by clips 6.
At this time, it is preferable that the height of the upper surface of the isolator 3 and the upper surface of the foamed synthetic resin block 4 is set in advance so that they are flush with each other in a state in which concrete is placed. The gap between the portions is closed with a flat material such as a tape or a concrete plate, a film, or the like as necessary.

  Next, the reinforcing bar 7 of the building foundation 5 is arranged on the reinforcing bar 3 a protruding from the isolator 3, and the mold 8 is installed so as to surround the isolator 3 and the foamed synthetic resin block 4.

Next, concrete is placed in a space 9 defined by the mold 8, the isolator 3, and the foamed synthetic resin block 4, and after the concrete is hardened, the mold 8 is removed to construct the building foundation 5. To do.
A building is constructed on the building foundation 5.

  When a building is constructed on the building foundation 5, a reinforced concrete column is preferably provided on the isolator 3. When so formed, the entire building on the building foundation 5 exhibits high seismic isolation. Further, in this case, the reinforcing bars 3a projected from the isolator 3 are preferably coupled to each other with the reinforcing bars arranged in the column by welding or connection, and the reinforcing bars 3a are connected to the reinforcing bars 3a rather than the embodiment shown in FIG. Further, by projecting upward, it is possible to facilitate the connection with the reinforcing bars arranged in the column.

  In the seismic isolation base 1 of the building thus constructed, the vibration of the ground is absorbed by the isolator 3 and is damped by the foamed synthetic resin block 4. Therefore, the seismic isolation foundation 1 of the building of the present invention is built on an underground parking lot, built in a place where a subway passes nearby, built near a road with heavy traffic, It is very effective when it is built near a road through which a large automobile passes or near a railroad track.

  As mentioned above, although the embodiment of the base isolation structure of the building and the base isolation base construction method according to the present invention has been described, the present invention is not limited to the above-described embodiment, and is described in the scope of claims. Various changes and modifications can be made within the scope of the technical idea of the present invention.

  For example, in the above-described embodiment, the isolators 3 are arranged at the four corners on the ground foundation 2, but the arrangement of the isolators 3 is not limited to the four corners, for example, in the middle of the corners, It can also be arranged at the center of the foundation 2 or the like.

  Moreover, in the said embodiment, although the isolator 3 was first arrange | positioned on the ground foundation 2, it was followed by the procedure of arrangement | positioning of the foaming synthetic resin block 4, and the arrangement | positioning of the formwork 8. It may be first.

  Further, in the above embodiment, the upper end surface of the isolator 3 is rectangular and the rectangular foamed synthetic resin block 4 is laid. However, for example, when the upper end surface of the isolator 3 is circular, the isolator 3 Since the gap between the upper end surface of the foamed synthetic resin block and the upper end surface of the foamed synthetic resin block is preferably as small as possible, the associated surface of the foamed synthetic resin block with the isolator is formed in an arc shape substantially concentric with the isolator.

It is the perspective view which showed notionally the base isolation structure of the building based on this invention notionally. It is sectional drawing of the part which follows the AA line in FIG. It is the perspective view which showed the procedure which builds the seismic isolation foundation of the building which concerns on this invention. It is the perspective view which showed the procedure which builds the seismic isolation foundation of the building which concerns on this invention. It is sectional drawing of the part which follows the BB line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation base 2 Ground foundation 3 Isolator 3a Reinforcement 4 Foam synthetic resin block 5 Building foundation 6 Clip 7 Reinforcement 8 Formwork 9 Space

Claims (4)

  An isolator is arranged at the four corners, a foamed synthetic resin block is arranged at a portion excluding the isolator, a concrete building foundation is arranged on the upper surface thereof, and the building foundation is connected to the isolator. A seismic isolation structure for buildings.   The reinforcing bar of the isolator in which a reinforcing bar is erected upward is connected to a reinforcing bar arranged in the building foundation, and the building foundation is connected to the isolator. Base-isolated basic structure of the building described in 1.   An isolator is arranged at four corners, a foamed synthetic resin block is arranged at a portion excluding the isolator, and a mold is arranged so as to surround the isolator and the foamed synthetic resin block, and then the isolator and the foamed synthetic resin block are arranged. A method for constructing a seismic isolation foundation for a building, comprising constructing a building foundation by placing concrete in a space defined by the upper surface of the frame and the formwork. 4. The building seismic isolation foundation construction method according to claim 3, wherein a reinforcing bar arranged on the building foundation is connected to a reinforcing bar of the isolator that is erected with the reinforcing bar facing upward.

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