JP5870015B2 - Seismic isolation device installation method and base isolation device installation structure for foundation pillars of existing buildings - Google Patents

Description

The present invention relates to an installation method and an installation structure of a seismic isolation device, and more particularly to an isolation method installation method and an isolation device installation structure suitable for installing an isolation device under a foundation of an existing building.

  There is a seismic isolation device as a device for reducing vibration of a building due to an earthquake. The seismic isolation device absorbs the vibration (sway) at the time of the earthquake and prevents the damage of the building due to the vibration. In recent years when earthquakes occur frequently, the existing building is seismically isolated using the seismic isolation device. Seismic isolation devices are being installed in various locations. As a method of installing a seismic isolation device in an existing building, there is known a method (Patent Document 1) in which a base (column) of a building is partially excised and a seismic isolation device (rubber support) is installed on the excision trace. Yes.

JP-A-10-246004

  When installing the seismic isolation device, from the viewpoint of avoiding tilting and cracking of the existing building, as shown in Fig. 8, the vertical difference from the adjacent column (adjacent column) of the existing building It is desirable that a vertical deformation angle α, which is an angle obtained by dividing a certain vertical displacement difference δ by a distance (span) L with respect to an adjacent column, be 1/2000 or less. For this reason, in the conventional construction method including the construction method described in Patent Document 1, the vertical displacement difference is measured and monitored using a PC-controlled measuring instrument or the like, and the vertical deformation angle between the columns is adjusted to be equal to or less than the above numerical value. The workability was poor. Moreover, since the construction method described in Patent Document 1 is a construction method in which the support jack is finally fixed (embedded) in the concrete, the economic burden is large.

  The problem to be solved by the present invention is to propose a seismic isolation device installation method that can suppress the vertical deformation angle (vertical displacement difference / span) within a predetermined range and has a lower economic burden than the conventional method. .

The present invention is a seismic isolation device installation method for installing a seismic isolation device on a foundation pillar of an existing building, wherein provisional receiving means is disposed around the foundation pillar to temporarily receive the load of the building, In the receiving state, a part of the foundation pillar is excised leaving the upper part (upper part of the foundation pillar) and the lower part (lower part of the foundation pillar), and the space between the lower part of the foundation pillar and the upper part of the foundation pillar generated by the excision is exempted. Place a seismic device, place a pre-compression jack between the seismic isolation device and the upper part of the foundation column, or between the seismic isolation device and the lower part of the foundation column, and pre-compress the seismic isolation device with the pre-compression jack. Then, the load applied to the temporary receiving means is transferred to the seismic isolation device, and a support is disposed around the pre-compression jack on the upper surface side or the lower surface side of the pre-compressed seismic isolation device. Remove the jack and load the existing building on the support and seismic isolation device A method of removing the said temporary supporting means from the by-line. Here, pre-compression is to prevent deformation of the seismic isolation device at the time of reaction force transition by pre-deformation (compression) by applying a design reaction force to the seismic isolation device in advance.

In the present invention , the support includes a combination of a piece (filling material) and a grout (stuffing), a combination of a piece (filling material) and a wedge (stuffing), or a piece (filling material) and a liner plate. Any one or more combinations of (stuffing) can be used.

In the present invention , the pre-compression force applied to the seismic isolation device disposed between the lower part of the foundation column and the upper part of the foundation column is transferred to the seismic isolation device that does not pre-compress the building load received by the temporary receiving means. In this case, the compression force can be the same or substantially the same as the compression amount generated in the seismic isolation device. In this case, the pre-compression force to the seismic isolation device is preferably a compression force with a vertical deformation angle (vertical displacement difference / span) between adjacent foundation columns of 1/2000 or less, but is limited to these values. It is not a thing.

In the present invention , when the seismic isolation device is disposed on the lower part of the foundation column after excision and the pre-compression jack is disposed on the base isolation device, the lower casing is constructed at least on the lower part of the foundation column, A lower part can also be fixed to the lower seismic isolation plate provided in the lower casing. In addition, after removing the pre-compression jack, an upper housing can be constructed at least below the upper part of the foundation column, and the upper part of the seismic isolation device can be fixed to the upper seismic isolation plate provided in the upper housing. In this seismic isolation device installation method, when a pre-compression jack is placed on the lower part of the foundation column after excision and the seismic isolation device is placed on it, at least the lower frame is placed on the lower part of the foundation column. An upper housing is constructed under the upper portion, a pre-compression jack is placed on the lower housing, a receiving material (for example, a plate) is placed on the upper housing, and a seismic isolation device is placed on the receiving material. The seismic isolation device can be temporarily fixed to the receiving material.

  For the seismic isolation device, for example, a rubber bearing (rubber rod) provided with a laminated material in which a rubber plate and a steel plate are laminated between upper and lower flanges can be used.

The present invention has the following effects.
(1) Since the seismic isolation device is pre-compressed, the seismic isolation device is not compressed (deforms) even if the load of the building shifts from the temporary support to the seismic isolation device. Even without it, the vertical deformation angle between adjacent columns can be suppressed to about 1/2000 or less, and the seismic isolation device installation work can be performed easily and quickly.
(2) Since the jack is not buried, the material cost is reduced and the economic burden can be reduced.

It is a work process explanatory drawing of the seismic isolation apparatus installation method of this invention, Comprising: (a) shows the state which installed the provisional receiving means, (b) shows the cutting | disconnection part of a foundation pillar. It is work process explanatory drawing of the seismic isolation apparatus installation method of this invention, Comprising: (a) shows the state which provided the lower housing in the foundation pillar lower part after excision, (b) is the seismic isolation device on the lower housing. This shows a state where the seismic isolation device is pre-compressed with a pre-compression jack installed on the seismic isolation device. It is work process explanatory drawing of the seismic isolation apparatus installation method of this invention, Comprising: (a) shows the state which set the padding material on the seismic isolation apparatus after a pre-compression, (b) is between a basic pillar upper part, This indicates the state where padding is installed between the padding materials. BRIEF DESCRIPTION OF THE DRAWINGS It is an operation | work process explanatory drawing of the seismic isolation apparatus installation method of this invention, (a) transfers a load to a support body, removes the jack for pre-compression from on a seismic isolation apparatus, and an upper housing on the foundation pillar upper part and its circumference | surroundings (B) shows the state after removing the temporary receiving means and completing the seismic isolation device installation method. (A)-(d) is a top view which shows the example of the arrangement | positioning relationship between a filling material and the jack for pre compression. It shows another example of the support, and shows an example in which a wedge is used as a filling to be placed on a filling material (concrete piece). The perspective view of a part notch which shows an example of a seismic isolation apparatus. Explanatory drawing of the vertical deformation angle and vertical displacement difference which a seismic isolation apparatus actually receives and deform | transforms.

(Embodiment)
DESCRIPTION OF EMBODIMENTS Embodiments of a seismic isolation device installation method and a base isolation device installation structure for a foundation pillar of an existing building of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, the seismic isolation device installation method includes existing structures (not limited to buildings, including existing structures such as towers, highways, bridges, etc .: description and claims). 7), and the seismic isolation device 1 may be a general-purpose rubber bearing (rubber rod) as shown in FIG. In this rubber bearing, a cylindrical lead plug 3 is arranged at the center between two disc-shaped flanges 2 (lower flange 2a, upper flange 2b), and a rubber plate 4a and a steel plate are arranged on the outer periphery of the lead plug 3. A laminated material 4 such as 4b is laminated. The outer periphery of the laminated material 4 is covered with a covering rubber 8. In the seismic isolation device installation method of the present invention, other seismic isolation devices such as newly developed shapes and structures may be used.

  1 to 4 are schematic diagrams showing work steps of the seismic isolation device installation method of the present invention, both of which are necessary work by excavating the soil (foundation part) around the foundation pillar 6 of the building 5 in advance. This shows a state where a space is secured. Excavation of the foundation can be done by existing methods. Hereinafter, an example of a specific procedure of the installation method according to the present invention will be described.

  As shown in FIG. 1 (a), provisional receiving means 7 is arranged around the foundation column 6, and the load of the building 5 is temporarily received by the provisional receiving means 7 (the load of the building 5 is temporarily received by the provisional receiving means 7). ). As the temporary receiving means 7, for example, a temporary support jack 7b mounted on a temporary support jack 7b can be used. For example, H-shaped steel or other shapes of steel can be used for the temporary support 7a. As the temporary receiving jack 7b, various types such as a hydraulic type, an air type, and a manual type can be used.

  As shown in FIG. 1 (b), a part of the foundation pillar 6 which has received the load of the building 5 by the provisional receiving means 7 and made no stress is excised leaving the foundation pillar lower part 6a and the foundation pillar upper part 6b. And the space which can arrange | position the said seismic isolation apparatus 1 is formed between the foundation pillar lower part 6a and the foundation pillar upper part 6b. For excision of the foundation pillar 6, for example, a wire saw can be used.

After excision of the foundation pillar 6, as shown in FIG. 2 (a), a lower housing 9 is constructed around the foundation pillar lower part 6a. The construction of the lower housing 9 can be performed by an existing method. Specifically, a frame is placed around the lower part of the foundation pillar 6a to determine the construction range of the lower frame 9, and after placing the bars in the frame, the frame material such as concrete or mortar is placed in the frame. To cast. It is desirable to remove air contamination when placing the frame material. In order to remove air, the placed concrete, mortar or the like can be agitated with existing equipment such as a vibrator or vibrated. On the surface side of the lower skeleton 9 (upper surface) provided lower seismic isolation plate X _1, the lower flange 2a, for example, bolts seismic isolation device 1, to be fixed by the existing fixing means such as a nut. On the bottom side of the lower base isolation plate X ₁ is cap nut and stud bolts are attached.

  After excising a part of the foundation pillar 6, as shown in FIG. 2 (b), the seismic isolation device 1 is arranged in the space formed between the foundation pillar lower part 6a and the foundation pillar upper part 6b. The pre-compression jack 11 is disposed on the upper flange 2b of the first. The seismic isolation device 1 is pre-compressed by jacking up the pre-compression jack 11. The purpose of pre-compression is to compress the seismic isolation device 1 in advance, so that the amount of compression of the seismic isolation device 1 when the load of the building 5 is transferred from the temporary receiving means 7 to the seismic isolation device 1 is reduced (almost). And the load of the building 5 received by the temporary receiving means 7 is transferred to the pre-compression jack 11 and the seismic isolation device 1, and further, as described later, for pre-compression. When the load of the building 5 received by the temporary receiving means 7 is transferred to the seismic isolation device 1 after the jack 11 is removed, the vertical deformation angle generated by compression of the seismic isolation device 1 is less likely to occur (the vertical deformation angle is less To be less than 1/2000). For this reason, the pre-compression force applied to the seismic isolation device 1 by the pre-compression jack 11 is applied to the seismic isolation device 1 by transferring the load of the building 5 from the temporary receiving means 7 to the seismic isolation device 1 that is not pre-compressed. A compressive force that is about the same (including substantially the same amount) as the amount of compression that occurs and that does not leave a load acting on the temporary receiving means 7 in the temporary receiving means 7 is preferable.

  After the pre-compression, as shown in FIG. 3 (a), a plurality of (thin) interlining materials 12 are arranged on the upper flange 2b of the seismic isolation device 1. For example, as shown in FIGS. 5A to 5D, the plurality of interlining materials 12 can be arranged around the pre-compression jack 11 with a space therebetween. In this case, the number and arrangement locations of the interlining materials 12 can be designed according to the load of the building 5 and the like. It is preferable that the padding material 12 is provided at a position where the reinforcement of the upper housing 14 is not hit. As the filling material 12, for example, a concrete piece molded in a columnar shape, a rod-shaped or pipe-shaped steel material, and materials made of various materials such as FRP can be used.

  As shown in FIG.3 (b), when using the concrete piece shape | molded in the column shape as the padding material 12, the filling 13 is provided in the space | gap produced between the upper surface of each concrete piece and the lower surface of the foundation pillar upper part 6b. . FIG. 3B shows an example in which grout is used as the filling 13. Since the grout can be filled in the gap without any gap, the foundation column upper portion 6b can be reliably supported even if the padding material 12 or the foundation column upper portion 6b has unevenness, depressions, or the like. Concrete or mortar can be used for the grout. The grout may be different from the interlining material 12, but the same material is preferred. In addition, the grout in this case includes hard mortar.

  The stuffing 13 may be other than grout. For example, a wedge as shown in FIG. 6 may be used. When a wedge is used as the stuffing 13, it is only necessary to insert a wedge, and since a curing period is unnecessary, improvement in workability and work speed can be expected. In any case, it is preferable that the filling 13 is filled or arranged so that the gap generated between the upper surface of the interlining material 12 and the lower surface of the foundation column upper portion 6b is completely filled. If a turnbuckle is used as the padding material 12, the padding 13 may not be provided if unnecessary. A liner plate may be used instead of the wedge. The wedge can be made of steel or FRP. The liner plate is a thin plate made of steel, mortar, or FRP.

  In the above-described embodiment, the support 15 between the seismic isolation device 1 and the foundation column upper portion 6b is exemplified by three patterns of a combination of a concrete piece and a grout, a combination of a concrete piece and a wedge, and a combination of a concrete piece and a liner plate. However, the support 15 may be other than these.

After the support 15 is provided (after grout curing when grouting is used for the stuffing 13, after the wedge is driven when stuffing is used for the stuffing 13, when the liner plate is used for stuffing 13, the liner plate is inserted. After), the pre-compression jack 11 is removed, and the upper housing 14 is constructed on the upper part of the seismic isolation device 1 as shown in FIG. The upper housing 14 is constructed so that the padding material 12 and the padding 13 are embedded in the upper housing 14. Specifically, a frame is arranged on the outer periphery of the foundation column upper part 6b and the upper flange 2b of the seismic isolation device 1 to determine the construction range of the upper casing 14, and the padding material 12 is displaced in the mold ( After the bar arrangement, the upper frame 14 is formed by placing a frame material such as concrete or mortar in the formwork. In placing the casing material, the mixed air is removed in the same manner as when the lower casing 9 is constructed. The surface side of the upper skeleton 14 (bottom side) is provided an upper base isolation plate X _2, are as the upper flange 2b of the seismic isolation device 1 can be fixed by fixing means such as for example, bolts and nuts. The upper surface of the upper base isolation plate X ₂ cap nut or stud or the like is mounted.

  After the upper housing 14 is cured, the temporary receiving means 7 is removed, and the seismic isolation device installation work is completed (FIG. 4B). In addition, although the said embodiment demonstrated only one foundation pillar 6, it cannot be overemphasized that it can construct with the same method also about the other foundation pillar 6. FIG.

(Other embodiments)
In the embodiment, the case where the pre-compression jack 11 is disposed on the seismic isolation device 1 is described as an example, but the pre-compression jack 11 may be disposed below the seismic isolation device 1. In this case, in the seismic isolation device installation method, when a pre-compression jack is placed on the bottom of the foundation column after excision, and the seismic isolation device is placed on it, at least the lower frame is placed on the bottom of the foundation column. The upper housing is constructed under the upper part of the foundation pillar, the pre-compression jack is placed on the lower housing, the receiving material (for example, plate) is installed on it, and the seismic isolation device is installed on the receiving material. The seismic isolation device can be temporarily fixed to the receiving member by arranging.

The present invention is a construction method that is particularly suitable for placing a seismic isolation device (rubber bearing) in an existing building, but can also be used when placing a seismic isolation device in a new building. Moreover, it is a construction method that can also be used at construction sites such as road construction and bridge construction, and construction construction sites as required.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Flange 2a Lower flange 2b Upper flange 3 Lead plug 4 Laminated material 4a Rubber plate 4b Steel plate 5 Building 6 Foundation pillar 6a Foundation pillar lower part 6b Foundation pillar upper part 7 Temporary receiving means 7a Temporary support 7b Jack 8 Cover rubber 9 Lower casing 11 Pre-compression jack 12 Filling material 13 Stuffing 14 Upper casing 15 Support X ₁ Lower seismic isolation plate X ₂ Upper seismic isolation plate

Claims (5)

A seismic isolation device installation method that installs a base isolation device on the foundation pillar of an existing building,
A plurality of temporary receiving means are arranged around the foundation pillar, and the load of the building is temporarily received by the temporary receiving means,
In the provisional receiving state, a part of the foundation pillar is excised leaving the lower part of the foundation pillar and the upper part of the foundation pillar, and a space is provided between the lower part of the foundation pillar and the upper part of the foundation pillar,
The lower precursor provided on the foundation pillar lower portion,
Place and fix the lower part of the seismic isolation device in the space and on the lower housing,
Place a pre-compression jack between the seismic isolation device and the upper part of the foundation column,
Pre-compress the seismic isolation device with the pre-compression jack, and transfer the load applied to the temporary receiving means to the seismic isolation device and the pre-compression jack,
A plurality of supports are arranged around the pre-compression jack between the pre-compressed seismic isolation device and the upper part of the foundation column,
After the placement of the support, the pre-compression jack is removed, and the load of the existing building is transferred to the support and the seismic isolation device,
Arranging reinforcing bars after placing reinforcing bars at positions that do not interfere with the support on the seismic isolation device, and constructing an upper casing in which the supports and reinforcing bars are embedded in the casing material, Then remove the provisional receiving means,
A seismic isolation device installation method for foundation pillars of existing buildings. Existing structures foundation pillar provided lower and foundation pillar space between the top of the isolator installation structure of an existing building digits set the isolator to the space,
The lower part of the seismic isolation device is fixed on the lower frame constructed in the lower part of the foundation pillar in the space,
The existing building is loaded with the seismic isolation device and a plurality of supports disposed thereon,
An upper case is constructed on the upper part of the seismic isolation device, and the upper case is one in which reinforcing bars arranged at positions not interfering with the plurality of supports and the support are embedded in the case material,
The support is a filling material , and the filling material is a concrete piece.
A seismic isolation device installation structure for existing buildings. In an existing building seismic isolation device installation structure in which a space is provided between the lower part of the foundation pillar and the upper part of the existing building, and a seismic isolation device is provided in the space ,
The lower part of the seismic isolation device is fixed on the lower frame constructed in the lower part of the foundation pillar in the space,
The existing building is loaded with the seismic isolation device and a plurality of supports disposed thereon,
An upper case is constructed on the upper part of the seismic isolation device, and the upper case is one in which reinforcing bars arranged at positions not interfering with the plurality of supports and the support are embedded in the case material,
The support is a combination of a filling material and stuffing, and the combination is one of a combination of a concrete piece and a grout, a combination of a concrete piece and a wedge, or a combination of a concrete piece and a liner plate, or Two or more,
A seismic isolation device installation structure for existing buildings. In an existing building seismic isolation device installation structure in which a space is provided between the lower part of the foundation pillar and the upper part of the existing building, and a seismic isolation device is provided in the space ,
The lower part of the seismic isolation device is fixed on the lower frame constructed in the lower part of the foundation pillar in the space,
The existing building is loaded with the seismic isolation device and a plurality of supports disposed thereon,
An upper case is constructed on the upper part of the seismic isolation device, and the upper case is one in which reinforcing bars arranged at positions not interfering with the plurality of supports and the support are embedded in the case material,
The support is a combination of padding material and padding, the padding material is a concrete piece, padding is grout, grout is concrete or mortar,
A seismic isolation device installation structure for existing buildings. In the seismic isolation device installation structure of the existing building according to any one of claims 2 to 4,
The frame material is concrete or mortar,
A seismic isolation device installation structure for existing buildings.

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