JPH11125307A - Method for installing base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit the center positions of respective parts to each other with ease and with high accuracy. SOLUTION: This earthquake isolation device is arranged between a foundation 10 and a building 12 (one example of a structure), and comprises a supporting body 16 retaining a ball 14 formed of, for example, steel ball, under a sliding rolling condition, a pan 18 supporting the ball 14 by rolling the ball 14 on the surface 18a of the pan 18, and a cover 20 covering the supporting body 16 and the pan 18. In this base isolation device, the pan 18 is fixed on the foundation 10 and the supporting body 16 is fixed to the building 12, thereby the building 12 can be supported movably against the foundation 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a seismic isolation device such as a free bearing, a sliding rolling bearing, a single ball rolling bearing, or a sliding bearing.

[0002]

2. Description of the Related Art There are various types of seismic isolation devices such as free bearings, sliding rolling bearings, single-ball rolling bearings, and sliding bearings. The seismic isolation device has components attached to the structure side and the foundation side, respectively, so as to follow horizontal movement during an earthquake.

[0003]

However, the seismic isolation device has various problems if the upper and lower parts are not centered. For example, as shown in FIG. 7, a description will be given of a seismic isolation device c in which a support b made of a sphere contacts a saucer a (center a1). In this case, in FIG. 7, for simplicity, seismic isolation devices c (positions A to A) are provided at the four corners of the base of a building d such as a house.
D) shows a state where it is arranged. The seismic isolation devices c at positions (A) and (C) are shifted leftward with respect to the center a1 of the tray, and the seismic isolation devices c at positions (B) and (D) are shifted rightward with respect to the center a1 of the tray. It is out of alignment.

Now, assuming that a seismic motion occurs in the right direction in FIG. 7, as shown in FIG. 8, the seismic isolation devices c at positions (A) and (C) go up, have large resistance, and move slowly. Become. On the other hand, the seismic isolation devices c at the positions (B) and (D) go down, have low resistance, and move faster. Therefore, the seismic isolation devices c at the positions (B) and (D) are different from the seismic isolation devices c at the positions (A) and (C).
Since the movement is faster than that, a clockwise horizontal rotational force acts on a building d such as a house.

[0005] If pan a in FIG. 7 and FIG. 8 is a straight line inclined position (A) and upstream of the resistance of the seismic isolation device _(C) Q _A, Q C _{is, Q A = Q C = μWcos} 2 θ + μWcos・ Sinθ The downward resistance Q _B , Q _D of the seismic isolation device at positions (B) and (D)
Becomes ^{_{Q B = Q D = μWcos 2}} θ-μWcos · sinθ.

When the seismic motion is reversed, the spheres at positions (A) and (C) (support b) go down, and the spheres at positions (B) and (D) go up. A counterclockwise rotational force acts on the object d. Further, when the position is as shown in FIG. 7, the height of the seismic isolation device c at the positions (A), (B), (C) and (D) is the same, but the positions (B) and (D) are the same. When the seismic isolation device c) comes to the lowest point of the center a1 of the tray, the positions (A) and (C) go up the slope of the tray a. Higher, position (B),
The ball of (D) is low. Then, when the seismic motion is reversed, the height temporarily becomes the same, then the positions (A) and (C) reach the lowest point of the saucer center a1, and the positions (B) and (D) rise and incline. This time, the positions (B) and (D) are higher, and the positions (A) and (C) are lower. That is, a vertical rotational force acts.

Further, when the sphere (support b) is in contact with the center of the tray, even if the center a1 of the tray is not formed in an arc shape, the sphere contacts at least the slope around the center a1 of the tray, so that the contact area is large. And the surface pressure decreases. if,
If the ball is in the middle of the slope due to the gap between the saucer a and the ball,
The sphere comes into contact with a plane and the surface pressure increases rapidly.

As described above, various problems occur if the centers of the upper and lower parts of each seismic isolation device do not match, so that the center alignment of the upper and lower parts of each seismic isolation device (centering) is performed. ) Must be ensured. However, in the case of a house, for example, dozens of seismic isolation devices are installed under the main pillars, and when bolts are installed in the originally planned holes with bolts, the upper and lower parts of all seismic isolation devices Is not always the center. That is, in order to set the position of the bolt hole in the unit of mm in the span of the beam of about 10 m, an accuracy of 1/1000 or more is required, which is not practical.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of installing a seismic isolation device that can easily and accurately adjust the center position of each component.

[0010]

The present invention has the following configuration to achieve the above object. The invention of claim 1 is
In a method of installing a seismic isolation device that attaches components to a structure and a foundation and movably supports the structure with respect to the foundation, at least one of the components on the structure side or the foundation side is attached to the structure or the foundation. After the structure is supported on the foundation via the seismic isolation device, adjustment is made so that the centers of the parts on the structure side and the foundation side coincide, and the parts are attached to the structure and the foundation. This is a method of installing a seismic isolation device characterized by being fixed. The invention of claim 2 is
The part is bolted to the structure and foundation, and the hole through which the bolt of the part passes is formed more than half of the dimensional accuracy of the structure larger than the bolt diameter, so that the part can be adjusted with respect to the structure or foundation. A method for installing a seismic isolation device according to claim 1, characterized in that: The invention according to claim 3 is characterized in that each part is provided with at least one mark for confirming the center position of the part, and the center position of each part is adjusted by matching the positions of the marks. A method of installing the seismic isolation device according to claim 1 or 2. According to the invention of claim 4, the other component is a saucer or an attached ring whose outer peripheral edge is a circular shape in a plan view, and the outer peripheral edge is a circular cover body similar to the saucer or the attached ring to one component. The center position between the parts is fixed based on a circumferential deviation between the outer peripheral edge of the cover body and the outer peripheral edge of the tray or the attached ring. This is how to install the seismic isolation device.

According to the first aspect of the present invention, at the time of installation of the seismic isolation device, at least one of the components on the structure side or the foundation side is attached to the structure or the foundation so as to be position-adjustable, and is connected via the seismic isolation device. After supporting the structure on the foundation,
Adjustment is made so that the centers of the components on the structure side and the foundation side coincide with each other, and the components are fixed to the structure and the foundation. Therefore, the center positions of the upper and lower components can be adjusted after the components are mounted. In this case, the component is attached to the structure and the foundation with bolts, and the hole through which the bolt of the component passes is formed to be at least half the dimensional accuracy of the structure larger than the diameter of the bolt. It can be positionally adjustable with respect to the object or the foundation. Also, as in claim 3,
If each component is provided with at least one mark for confirming the center position of the component and the center position of each component is adjusted by matching the mark positions, the mark can be easily confirmed and the alignment can be performed more quickly. . According to the fourth aspect, the center position between the components can be adjusted based on the circumferential deviation between the outer peripheral edge of the circular cover body and the outer peripheral edge of the circular tray or the attached ring. With this configuration, it is very easy to confirm whether the circumferences of the parts match each other, and the center positions of the components can be extremely easily matched.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 are explanatory diagrams of a method of installing the seismic isolation device according to the embodiment. FIG. 1 shows an attached state of the seismic isolation device, and FIG. 2 shows an exploded state thereof.

As shown in FIG. 1, the seismic isolation device is
And a support 16 for holding a ball 14 made of, for example, a steel ball in a sliding and rolling state, and the ball 14 on its surface 18a.
And a cover 20 that covers the support 16 and the tray 18. In this seismic isolation device, a tray 18 is fixed to a foundation 10, a support 16 is fixed to a building 12, and the building 12 is movably supported with respect to the foundation 10.

The support 16 is provided on the bottom surface 12a of the building.
(A base beam 12b is provided on the bottom surface as shown in FIG. 3). A mounting flange portion 16a fastened by an anchor bolt 22 and a concave portion 16 for holding the ball 14 in an active state.
composed mainly of a ball reception portion 16b having a b _1. The recess 16b ₁ is not open downwardly, the radius of curvature,
It is set slightly larger than the radius of curvature of the ball 14. A concave portion 16b1 is provided on the inner periphery of the lower end of the ball storage portion 16b.
Inner collar 1 in contact with the outer periphery of the lower end of ball 14 housed in
6b ₂ is provided, a ball 14 accommodated in the recess 16b ₁ is by the inner brim portion 16b _2, are embraced within the recess 16b _1. And, the flange portion 1 of the support 16
6a has a through hole 2 through which the anchor bolt 22 is inserted.
4 is formed, and the nut 22 is
a is screwed together to fasten the flange portion 16a. The inner diameter of this through hole 24 is the anchor bolt 22
The diameter is larger than the outer diameter.

The receiving tray 18 is substantially disk-shaped. On the upper surface of the rolling tray 18, a shape (substantially mortar shape) that approaches the support 16 side from the center position to the outer side.
And an inclined surface 18a for rolling the ball 14 is provided. The inclined surface 18a can be appropriately selected from a linear inclined surface (for example, an inclination angle of about 1 ° to 5 °), an arc-shaped inclined surface, and an elliptical curved inclined surface in a side view.

As shown in FIGS. 2 and 4, when the ball 14 rolls on the peripheral portion of the tray 18, the ball 18 comes into contact with the peripheral portion to stop the rolling of the ball 14. A stopper 26 is provided upright to prevent the tray 18 from falling off. The receiving tray 18 is formed in a circular shape in plan view including the stopper 26 at the peripheral edge. In addition, as shown in FIG.
It may be attached to the tray 18 as a separate ring.

The cover 20 has a substantially umbrella shape as shown in FIG. 2 or a disk shape as shown in a modification of FIG.
The upper surface is covered with the stopper portion 26 to prevent rainwater from entering the support 16 and the tray 18 and dust from entering. The outer peripheral edge of the cover 20 has the same circular shape as the outer peripheral edge of the tray stopper 26. The radius of the outer peripheral edge of the cover 20 is preferably the same as the radius of the stopper 26. Further, the cover 20 may be an integral one, or may be divided into a plurality of parts and integrated by assembling.

The receiving plate 18 is fixed to the foundation 10 by holding the fixing plate 28 from four places around the receiving plate 18. The fixing bracket 28 inserts an anchor bolt 30 fixed to the foundation into a through hole 28a. Let me nut 30a
To fasten. The inner diameter of the through hole 28 a is formed to be larger than the outer diameter of the anchor bolt 30.

Next, a method of installing the seismic isolation device will be described. This installation is performed according to the procedure of FIG. First, as shown in FIGS. 1 and 2, the cover 20 is attached to the support 16 (step S1). Next, as shown in FIG. 3, the support 16 is attached to the base bottom surface 12a of the building 12 (step S2). That is, the support 16 is temporarily tightened by inserting the anchor bolt 22 of the building 12 side into the through hole 24 of the flange portion 16a and lightly tightening the nut 22a. In this case, since the inner diameter of the through hole 24 is formed to be larger than the outer diameter of the anchor bolt 22, the position in the horizontal direction can be adjusted.

On the other hand, in parallel with the mounting of the support 16, the tray 18 is mounted on the foundation 10 as shown in FIG. 1 (step S3). That is, the receiving tray 18 is temporarily fastened by inserting the anchor bolt 30 into the through hole 28a of the fixture 28 and lightly tightening it with the nut 30a. In this case, since the inner diameter of the through hole 28a is formed to be larger than the outer diameter of the anchor bolt 30, the position in the horizontal direction can be adjusted. Therefore, steps S2 and S3
Here, the support 16 and the tray 18 are attached to the building 12 and the foundation 10 so as to be position-adjustable.

Next, the support 16 together with the base beam 12b of the building 12 is lowered onto the tray 18 and put on it (step S4). As a result, the building 12 is supported on the foundation 10 via the seismic isolation device, and the state shown in FIG. 1 is obtained.

Thereafter, the center of the support 16 on the building 12 side and the center of the receiving tray 18 on the foundation 10 are adjusted to be aligned (step S5). In this case, the cover 20 is fixed to the support 16, and the center axis of the outer peripheral edge portion 20 a of the cover 20 is aligned with the center axis of the support 16. At the same time, the center axis of the outer peripheral surface of the stopper 26 of the tray 18 coincides with the center axis of the inclined surface 18a in the stage of manufacturing the tray 18. Then, the displacement between the outer peripheral edge of the stopper 26 of the tray 18 and the outer peripheral edge of the cover 20 facing the stopper is measured by visual observation or gauge at a plurality of right and left sets, and the support 16 is positioned at the left and right sets at a position where the aforementioned displacement is eliminated. Alternatively, the tray 18 is moved. Thereby, the center of the support 16 and the center of the tray 18 can be matched.

As described above, after the center of the support 16 and the center of the tray 18 are aligned, each of the anchor bolts 2
2 and 30 are tightened to firmly fix the support 16 and the tray 18 to the building 12 and the foundation 10 (step S).
6).

As described above, the support 16 and the pan 1
8 is temporarily attached to the building 12 and the foundation 10, and then the center position is adjusted.
There is no need to increase the precision from the beginning to attach to 2 and foundation 10. For example, in a house, there is a permissible error in the construction, and it is not realistic to construct with higher accuracy than this permissible error, and even within this permissible error, there is an error. Although it is almost impossible to fix the support 16 and the tray 18 to the building 12 and the foundation 10, in the embodiment, it is possible to center the seismic isolation device by coping with such a tolerance. Therefore, after the anchor bolts are temporarily tightened and the centers of the upper and lower parts (the support 16 and the tray 18) can be aligned with high precision, the anchor bolts 22 and 30 are tightened to attach the support 16 and the tray 18 to each other. It can be firmly fixed to the building 12 and the tray 18 with the center aligned with high precision.

The allowable error of the building 12 is 1/100.
If the span is 10 m as 0, it is 10 mm. Anchor bolt 2 for mounting support 16 and pan 18
The through-holes 24 and 28a through which the holes 2 and 30 pass need not be wider than the outer diameter of the anchor bolts 22 and 30 by the allowable error or more (in this case, 10 mm or more), and are at least half (5 mm or more) larger than the allowable error. It is enough if you increase the diameter to make room. However, in this case, if a margin is formed only in the through hole on one side of the building 12 side (support 16) or the foundation 10 side (dish 18), only one side can move only 5 mm and it corresponds to dimensional accuracy. Cannot be adjusted. That is,
Span size is 10m and tolerance is 1/1000 of 10
mm, and if this error is increased by 10 mm on the foundation side, the error is 5 mm at each end of the span, and the seismic isolation devices located at both ends of the span are respectively on the building 12 side and the foundation 10 side. It is necessary to be able to adjust 5 mm between the upper and lower sides. Therefore, the support members 16 corresponding to the upper and lower
By increasing the diameter of each of the through holes 24 and 28a in each of the holes 16 and 28a by at least half of the dimensional accuracy, for example, by 5 mm, the support 16 and the tray 18 can be moved 2.5 mm forward and backward in the span direction. The adjustment range of the center position in the vertical direction is 5 mm. Therefore, if the diameter of the through holes 24 and 28a of the support 16 and the receiving tray 18 is made larger than the outer diameter of the anchor bolts 22 and 30 by at least half (5 mm or more) of the permissible error, a margin is made, and the margin is made. The center position between the object-side support 16 and the tray 18 on the base 10 can be adjusted.

The anchor bolts 22 and 30 are inserted through the through holes 24 and 28a which are larger than their outer diameters.
When the ball 14 is rolling on the tray 18, the coefficient of friction is low, and when the seismic isolation function is working, the lateral load on the support 16 and the tray 18 is about 1 ton. No problem. Also, even if the ball collides with the stopper due to a large earthquake, etc., the through hole 2
Since 2, 30 has room for anchor bolts,
Deviation occurs in that range, and on the contrary, there is an effect of reducing the impact force.

The present invention is not limited to the above-described embodiment. For example, the present invention is not limited to the center alignment by the cover 20 and the stopper 26. As shown in FIG. Marks 32, 32, 32 that allow the center position of each part to be confirmed
The above can be provided. When it is difficult to measure the distance between the cover and the stopper, the center position can be easily adjusted by the marks 32, 32, 32 provided at positions that are easy to see from the outside.

In the above embodiment, the seismic isolation device for the sliding rolling bearing is described. However, a free ball ring, a single ball rolling bearing in which a single ball is interposed between the upper plate and the lower plate, and a sliding body on the receiving plate. The same can be applied to a sliding bearing in which the contact is made.

[0029]

As described above, according to the present invention, the center position of each component can be easily and accurately adjusted.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method of installing a seismic isolation device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method of installing a seismic isolation device.

FIG. 3 is an explanatory diagram around a building base of the installed seismic isolation device.

4A and 4B are explanatory views of a method of installing the seismic isolation device, wherein FIG. 4A is a plan view and FIG. 4B is a side sectional view.

FIG. 5 is an explanatory view of a modification of the seismic isolation device.

FIG. 6 is an explanatory diagram of an installation procedure of the seismic isolation device.

FIG. 7 is an explanatory diagram of an attached state of a general seismic isolation device.

FIG. 8 is an explanatory diagram of a behavior of a saucer and a ball of the seismic isolation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Foundation 12 Building 14 Ball 16 Support body 18 Receiving tray 20 Cover 22 Anchor bolt 24 Through hole 26 Stopper part 28 Fixture 30 Anchor bolt

Claims (4)

[Claims] 1. A method of installing a seismic isolation device for mounting components on a structure and a foundation and movably supporting the structure with respect to the foundation, wherein at least one of the components on the structure side or the foundation side is structured. After mounting the structure on the foundation via the seismic isolation device, adjust the parts so that the centers of the parts on the structure side and the foundation side coincide with each other. A method for installing a seismic isolation device, characterized by being fixed to a structure and a foundation. 2. The part is attached to the structure and the foundation with bolts, and a hole through which the bolt of the part passes is formed to be larger than the bolt diameter by at least half of the dimensional accuracy of the structure. The method of claim 1, wherein the position of the seismic isolation device is adjustable. 3. Each component is provided with at least one mark for confirming the center position of the component, and the center position of each component is adjusted by matching the mark positions. 3. The method of installing the seismic isolation device according to 1 or 2. 4. The other component is a saucer or an attached ring whose outer peripheral edge is a circular shape in a plan view, and the outer peripheral edge is fixed to one component with a circular cover body similar to the saucer or the attached ring. 3. The exemption device according to claim 1, wherein the center position between the components is adjusted based on the circumferential deviation between the outer peripheral edge of the cover body and the outer peripheral edge of the tray or the attached ring. How to install the seismic device.