JP2004084189A - Method for installing base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an installing method in which the horizontal states, heights or the like of various type base isolation devices are adjusted easily when they are to be installed. <P>SOLUTION: In the base isolation device 1, an upper supporter 1a connected on the sill side of a building and a lower supporter 1b connected on the foundation side are constituted relatively movably. Both supporters are fixed onto a sill 5, in which steel frames are unified in a lattice frame shape, under the state in which both supporters are fixed temporarily in a relatively unmovable manner, and the positional adjustment and horizontal adjustment of the whole sill 5 are conducted by jacks 8 mounted at proper places. Forms are secured around anchors set up on the underside of the base isolation device 1 when a positioning at a proper place of the device 1 is confirmed, the device 1 is fixed onto a foundation by the supporter 1b by concrete or the like and a temporary fixing in both supporters 1a, 1b is released. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an installation technique of a seismic isolation device that supports a building so that it can move in the horizontal direction under its own weight, and particularly to an installation method that can easily adjust the horizontal state and height of the seismic isolation device. .
[0002]
[Prior art]
In recent years, awareness of disaster prevention has increased, and various types of seismic isolation devices have been developed. In these seismic isolation devices, the upper support connected to the building side and the lower support connected to the foundation side are horizontally moved by appropriate moving means such as sliding and rolling between the two. It is configured to be relatively movable. By the way, the conventional seismic isolation building is intended for a heavy building such as a building, but recently the demand for a lightweight building such as a detached house is increasing. In such a lightweight building, as described in, for example, JP-A-2000-266116 or JP-A-2001-90384, a lattice frame-like shape made of a highly rigid material such as a steel frame corresponding to the foundation of the building is used. It is common that a plurality of seismic isolation devices are arranged between the frame and the foundation.
[0003]
When installing the former seismic isolation device, the lower support (bottom) with the upper support (load support) etc. separated first at each installation location is placed horizontally on the foundation with anchor bolts. Fix it. Next, the upper support is placed via a bearing ball, the base is placed on the upper support, and the two are connected to each other, and then a building is constructed on the base. In the latter seismic isolation device, anchor bolts are implanted in advance at predetermined positions on the foundation, and long holes provided at four corners of a lower support (spring receiving lower frame) of the seismic isolation device are fitted into the anchor bolts. The seismic isolation device is fixed to the foundation by clamping it with nuts from above and below. Then, the upper support (spring support upper frame) of the seismic isolation device is connected to a rigid bottom plate integral with the base. In this case, the height of the seismic isolation device is adjusted by a nut provided on the lower surface of the lower support.
[0004]
[Problems to be solved by the invention]
However, in all of these construction methods, the lower support of the seismic isolation device is fixed to the anchor bolts implanted on the foundation, and then the upper support and the base portion are connected. Accuracy is greatly affected by the accuracy of construction of the lower support. Therefore, there is a problem that not only the workability is poor, but also the intended seismic isolation function may not be exhibited.
[0005]
The inventors of the present invention have made intensive studies on the method of installing such a seismic isolation device, and as a result, have arrived at the present invention. That is, an object of the present invention is to provide a method of installing a seismic isolation device that can achieve good construction accuracy and is excellent in workability.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, in the method of installing a seismic isolation device according to the present invention, a plurality of seismic isolation devices configured such that an upper support and a lower support are relatively movable in the horizontal direction are provided. In a state in which the support is temporarily fixed so as to be relatively immovable, it is coupled to a required position on the lower surface of the base on which the building is placed via the upper support, and in this state, the base and the like in the horizontal and vertical directions are After adjusting the position and the level, the lower support is connected to a foundation, and the temporary fixation of the upper support and the lower support is released.
[0007]
According to this configuration, the upper supports of the plurality of seismic isolation devices are temporarily fixed at predetermined positions on the lower surface of the base having high horizontal rigidity so as to be relatively immovable with respect to the lower supports in this state. Since the horizontal and vertical positions and the horizontality are adjusted and the seismic isolation device is connected to the foundation on the lower support side, the position of each seismic isolation device can be adjusted as a whole of the seismic isolation layer. For this reason, each seismic isolation device can be simply and accurately installed.
[0008]
Further, in the installation method of the present invention, the lower support may be connected to the base via a plate and an anchor provided on the lower surface thereof. In this case, since the seismic isolation device can be slid in the horizontal direction on the plate and removed from the foundation, the work of replacing the entire device is easy. It is convenient to integrate the plate and the anchor in advance by welding or the like.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The installation method of the seismic isolation device according to the present invention can be widely used not only for buildings but also for installation of equipment in plant facilities and the like, and the installation place is not particularly limited. Further, as the seismic isolation device, various types of conventionally known types such as a laminated rubber type, a ball bearing type, a cross rail type, and a roller type can be applied. In addition, as a base on which a building or the like is mounted, a base having high horizontal rigidity is indispensable. The plane shape may be either a frame shape or a plane shape, and specifically, a steel frame integrated into a frame shape, an iron plate, a PC plate, or the like can be used. Further, it is of course possible to combine an appropriate damper mechanism and a trigger mechanism in addition to the seismic isolation device.
[0010]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 12 show one embodiment of a method of installing a seismic isolation device according to the present invention. In FIG. 1, the seismic isolation device 1 is formed such that an upper support 1a and a lower support 1b are relatively movable in a horizontal direction. Although not shown, the upper support 1a and the lower support 1b are temporarily fixed by appropriate members so as not to relatively move in the horizontal direction during construction. Then, with the plate 2 attached to the lower support 1b on the lower surface side, the anchor 4 is coupled to the lower side so as to sandwich the plate 2 with bolts 3 inserted from above the lower support 1b. Here, it is preferable that the anchor 4 is integrated with the plate 2 in advance. The anchor 4 is formed by screwing a bolt to the lower end of a long nut. The seismic isolation device 1 to which the anchor 4 is coupled in this way is temporarily placed at a predetermined position as shown in FIG.
[0011]
Next, as shown in FIGS. 3 and 4, a base 5 having a steel frame 5 a assembled in a lattice frame shape is placed on the upper surface of the plurality of seismic isolation devices 1 temporarily placed at predetermined positions. The support 1a and the base 5 are fixed with bolts. In addition, the connection between the steel frames 5a on the base 5 is temporarily fixed, and the distortion or twist of the steel frames 5a is corrected by a brace or the like (not shown), and the horizontality of the flange portion of the steel frame 5a is checked. Perform final tightening.
[0012]
As shown in FIGS. 5 and 6, the base 5 integrated with all the seismic isolation devices 1 uses wires 6 and lever blocks 7 provided at two places on each side of the base 5, respectively. To perform horizontal positioning. The end of the ground side wire 6 is connected to an appropriate anchor 6a, and the end of the base 5 side is connected to a hook 6b welded to the web portion of the steel frame 5a. This adjustment is performed by the tension of the wire 6 connected to each side of the base 5, as shown in FIG.
[0013]
Subsequently, as shown in FIG. 7, jacks 8 are respectively installed at appropriate locations on each side of the base 5 to adjust the height as a whole and to adjust the horizontal state. Note that the procedure for adjusting the position, height, and horizontal state in the horizontal direction is not limited to this. As shown in FIG. 8, the same operation can be performed by using height adjusting bolts 9 previously implanted at the installation site of the seismic isolation device 1 instead of the jack 8.
[0014]
9 to 13 show a method of bonding to a foundation which is a final step. That is, a formwork 10 for forming a foundation pillar portion is installed so as to surround the anchor 4 of the seismic isolation device 1, and a funnel 11 is applied to an upper end corner of the formwork 10 and filled with concrete or grout. Confirmation of the filling state is performed by leakage from a diagonal corner. At this time, it is desirable that the grout or the like be filled to a level near the level of the plate 2 attached to the lower support 1b of the seismic isolation device 1 in order to replace the seismic isolation device 1 described later. . As shown in FIG. 12, an injection hose 12 can be used instead of the funnel. Then, as shown in FIG. 13, after a required curing period has elapsed, the mold is disassembled, the jack 8 and the like are removed, and the upper support 1a and the lower support 1b are temporarily fixed (not shown). Cancel. As a result, the seismic isolation device 1 is connected to the foundation 5 (foundation) and the base 5 so as to be relatively movable while securing a horizontal state at an appropriate position.
[0015]
14 to 20 show another embodiment of the installation method according to the present invention. This installation method is significantly different from the above embodiment in that a foundation pillar is formed first. That is, as shown in FIG. 14, the mold 20 is first erected at a position where the seismic isolation device 1 is to be installed so as to be rectangular in plan view. Subsequently, as shown in FIG. 15, an appropriate box-cutting formwork 21 is installed on this, and concrete or the like is poured. In this case, the boxless forming frame 21 is fixed by attaching all the screw bolts 23 to the holding plate 22 and connecting the front end portion thereof to the lid 21a fixed to the upper end surface side of the boxless forming frame 21. . In the center of the holding plate 22, a height adjusting bolt 24 composed of a long nut and a bolt having a head formed in a spherical shape is attached and planted in concrete or the like.
[0016]
FIG. 16 shows a state where the mold 20 is removed from the mold. A cylindrical gap 26 is formed in the corner post 25, and a height adjusting bolt 24 projects from the center of the gap. Next, the seismic isolation device 30 is temporarily placed on the upper surface of the foundation pillar 25. In the seismic isolation device 30, the upper support 30a and the lower support 30b are formed so as to be relatively movable in the horizontal direction, similarly to the above-described embodiment. In order to prevent the upper support 30a and the lower support 30b of the seismic isolation device 30 from moving relative to each other during the construction, the two are temporarily fixed in advance at four corners thereof by the angle members 33 and the bolts 34. The same applies to the point that the anchors 4 are connected to the lower surface of the lower support 30b with the plate 2 interposed therebetween, and these anchors 4 are installed in the gaps 26, respectively.
[0017]
Then, as shown in FIG. 18, a frame-shaped base 5 made of steel is placed on the upper surface of each seismic isolation device 30 temporarily placed at a predetermined location, and the steel frame 5a is distorted or twisted by a brace or the like (not shown). Is corrected and the level of the flange portion of the steel frame 5a is confirmed, and then the base 5 is fully tightened. Subsequently, as shown in FIG. 19, the base 5 and the upper support 30 a of the seismic isolation device 30 are fixed with bolts 31. Then, in each seismic isolation device 30, the height adjustment bolt 24 is moved forward and backward to adjust the height of the base 5 and the like as a whole and the horizontal state. In this case, the position adjustment in the horizontal direction using a wire or a lever block is the same as in the above embodiment. Then, as shown in FIG. 20, a mold 32 is placed so as to surround the upper part of the foundation pillar portion 25, and grout or the like is injected to fill the gap portion 26 and its upper portion without any gap. At this time, the point that grout or the like does not exist on the side surface of the lower support 30b is the same as in the above embodiment. After the grout or the like has hardened, the mold 32 is released, and the angle members 33 attached to the four corners are removed. Thereby, the seismic isolation device 30 is connected to the base 5 and the foundation column portion 25 so as to be able to move relative to the base 5 and the foundation column portion 25 while securing a horizontal state at an appropriate position.
[0018]
Next, a case of replacing the seismic isolation device will be described based on the first embodiment. First, as shown in FIG. 21, jacks 8 are installed on both sides of the seismic isolation device 1 so as to receive the overall weight of the device. Next, a bolt (not shown) connecting the lower support 1b and the anchor 4 is removed to separate the seismic isolation device 1 from the foundation 13 and release the connection between the upper support 1a and the base 5. . Then, the jacks 8 on both sides are slightly raised. In such a state, only the seismic isolation device 1 can be moved in the horizontal direction as shown in FIG. In this case, since the plate 2 exists between the lower support 1b and the upper surface of the foundation pillar 13, the seismic isolation device 1 can slide on the surface and move easily.
[0019]
Further, a device as shown in FIG. 23 may be used as the elevating means of the base 5 or the like. That is, the elevating device 40 is such that a chain block 42 is attached to a horizontal bar 41 a of a gate-shaped frame 41. Then, it is installed so as to straddle the base 5 and height adjustment and horizontal position adjustment are performed as appropriate.
[0020]
In the above-described embodiment, the case where the seismic isolation device is installed on the foundation pillar portion has been described. However, the present invention is applied to the case where the seismic isolation device is applied to a cloth foundation, or the horizontal and height adjustment means is changed to another one. Various modifications within the technical idea of the present invention are of course possible.
[0021]
【The invention's effect】
As described above, according to the method of installing the seismic isolation device of the present invention, the upper supports of the plurality of seismic isolation devices are relatively moved between the lower support and the required position on the lower surface of the base having a high horizontal rigidity. In this state, it is fixed in a temporarily fixed state, and in this state, the position in the horizontal direction and the vertical direction and the degree of horizontality are adjusted, and the seismic isolation device is connected to the base on the lower support side. The position can be adjusted as a whole seismic isolation layer. For this reason, each seismic isolation device can be simply and accurately installed.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a construction procedure showing an embodiment of a method of installing a seismic isolation device according to the present invention, and shows a part of a lower support as a cross section.
FIG. 2 is an explanatory diagram showing a next step of FIG. 1;
FIG. 3 is an explanatory diagram showing a next step of FIG. 2;
FIG. 4 is an overall view showing a state where a base is placed on the seismic isolation device.
FIG. 5 is a plan view showing a state in which horizontal position adjustment is performed from the state of FIG. 4;
FIG. 6 is an explanatory view of the state of FIG. 5 as viewed from the side.
FIG. 7 is an explanatory diagram showing adjustment in a height direction.
FIG. 8 is an explanatory view showing another embodiment of FIG. 7;
FIG. 9 is an explanatory view showing an injection state of grout and the like.
FIG. 10 is an explanatory view showing the state of FIG. 9 in a plan view.
FIG. 11 is an explanatory diagram showing a step subsequent to FIG. 10;
FIG. 12 is an explanatory view showing another embodiment of FIG. 11;
FIG. 13 is an explanatory view showing a state after the mold is released from the mold.
FIG. 14 is an explanatory view of a construction procedure showing another embodiment of a method of installing a seismic isolation device according to the present invention.
FIG. 15 is an explanatory diagram showing a step subsequent to FIG. 14;
FIG. 16 is an explanatory diagram showing a step subsequent to FIG. 15;
FIG. 17 is an explanatory diagram showing a step subsequent to FIG. 16;
FIG. 18 is an explanatory view showing a step subsequent to FIG. 17;
FIG. 19 is an explanatory diagram showing a step subsequent to FIG. 18;
FIG. 20 is an explanatory diagram showing a step subsequent to FIG. 19;
FIG. 21 is an explanatory view showing a method of replacing the seismic isolation device.
FIG. 22 is an explanatory diagram showing a step subsequent to FIG. 21.
FIG. 23 is a front view of a lifting device used in another embodiment of the method of installing the seismic isolation device according to the present invention.
[Explanation of symbols]
1, 30: seismic isolation device, 1a, 30a: upper support, 1b, 30b: lower support, 2: plate, 3, 31, 34 ... bolt, 4 ... anchor, 5: base, 5a: steel frame, 6 ... Wire, 7: lever block, 8: jack, 9, 24: height adjustment bolt, 10, 20, 21a, 32: formwork, 13, 25: foundation column, 26: void, 33: angle material, 40 …lift device

Claims (2)

A building or the like is placed with a plurality of seismic isolation devices configured so that the upper support and the lower support are relatively movable in the horizontal direction, with the upper support and the lower support temporarily fixed so as to be relatively immovable. It is connected to the required position of the lower surface of the base via the upper support, and after adjusting the horizontal and vertical positions and the horizontality of the base and the like in this state, the lower support is used as a base. A method for installing a seismic isolation device, comprising: combining and releasing temporary fixing between the upper support and the lower support. The method of claim 1, wherein the lower support is coupled to a base via a plate and an anchor provided on a lower surface of the plate.

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