JP2020159105A - Base plate installation method of seismic isolation device - Google Patents

Abstract

To provide a base plate installation method of a seismic isolation device which facilitates leveling without being affected by unevenness and inclination of a foundation installation surface, and enables a base plate to be easily and accurately installed.SOLUTION: An installation method of a base plate 10 in a seismic isolation device includes: a pedestal fixing step of fixing a mounting pedestal 16 to a main reinforcement 52 of a lower skeleton 50 of the seismic isolation device; a bolt mounting step of mounting a bolt 14 for adjusting in contact with the base plate 10 on the mounting pedestal 16; a leveling step of adjusting a height of the bolt 14 for adjusting with respect to the mounting pedestal 16 and leveling the base plate 10; and a fixing step of fixing the bolt 14 for adjusting to the mounting pedestal 16.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seismic isolation structure, and more particularly to a method of installing a base plate for mounting a seismic isolation device.

In order to protect human lives and protect the building frame and important equipment stored inside from earthquakes, a seismic isolation layer is provided in the lower part of the building to reduce the seismic force applied to the building body during an earthquake. , Used in many buildings.

Conventionally, a method as disclosed in Patent Document 1 has been adopted for installing a base plate for attaching such a seismic isolation device. The outline of the base plate installation method disclosed in Patent Document 1 is as follows. First, a post-casting portion is provided on the seismic isolation device mounting portion on the upper surface of the foundation concrete, and an anchor frame (horizontal reinforcing bar or vertical reinforcing bar) is temporarily fixed on the upper portion of the post-casting portion to serve as a support material. Next, using this support material as a reference, a bag nut for attaching the seismic isolation device and a base plate on which anchor bolts are suspended are arranged. Then, fluidized concrete is press-fitted through the concrete filling holes provided in the base plate, and the post-casting portion is filled with concrete to fix the base plate.

Japanese Unexamined Patent Publication No. 2015-25358

An anchor frame is required in the base plate installation method as disclosed in Patent Document 1. For this reason, it is difficult to manage the complicated construction using a large number of members such as planting reinforcing bars for setting up the anchor frame, positioning the anchor frame and the base plate, and setting the level.

For this reason, it takes a long time to construct the seismic isolation layer, which makes the construction method inefficient and causes an increase in cost.

Therefore, it is an object of the present invention to provide a method for installing a base plate of a seismic isolation device, which is not affected by unevenness or inclination of the foundation placing surface, is easy to level, and can easily and accurately install the base plate. And.

The method for installing the base plate of the seismic isolation device according to the present invention for achieving the above object is the method for installing the base plate in the seismic isolation device, and the pedestal fixing for fixing the mounting pedestal to the main bar of the lower skeleton of the seismic isolation device. The process, the bolt mounting process of mounting the adjusting bolt in contact with the base plate on the previously described pedestal, and the leveling of the adjusting bolt by adjusting the height of the adjusting bolt with respect to the previously described pedestal to level the base plate. It is characterized by having a step and a fixing step of fixing the adjusting bolt to the above-mentioned pedestal.

Further, the method of installing the base plate of the seismic isolation device having the above-mentioned characteristics is characterized in that it has a bolt fixing step of fixing the adjusting bolt to the back surface of the base plate before the bolt mounting step. .. Having such a feature facilitates positioning of the horizontal position of the base plate with respect to the adjusting bolt.

Further, in the method of installing the base plate of the seismic isolation device having the above-mentioned characteristics, after the bolt mounting step, there is a plate mounting step of mounting the base plate on the adjusting bolt, and the fixing step. It is characterized by including a bolt fixing step of fixing the adjusting bolt and the base plate. With such a feature, the degree of freedom in the mounting position of the mounting pedestal and the adjusting bolt is high, and even when the number of adjusting bolts is large, it is possible to easily cope with it. ..

Further, in the method of installing the base plate of the seismic isolation device having the above-mentioned characteristics, the above-mentioned pedestal is a flat steel plate, and the leveling is performed via a nut screwed into the adjusting bolt. With such a feature, the height of the base plate can be easily adjusted.

Further, the method of installing the base plate of the seismic isolation device having the above-mentioned characteristics is characterized in that the adjusting bolt is fixed with a double nut so as to sandwich the above-mentioned pedestal from above and below. With such a feature, the adjusting bolt can be fixed easily and quickly.

Further, the method of installing the base plate of the seismic isolation device having the above-mentioned characteristics is characterized in that the adjusting bolt is fixed to the base plate via a nut. With such a feature, the adjusting bolt can be reliably held against the base plate.

According to the base plate installation method of the seismic isolation device having the above-mentioned characteristics, leveling can be easily performed without being affected by the unevenness and inclination of the foundation placing surface. In addition, the base plate can be installed easily and accurately.

It is a figure which shows the installation state of the base plate which applied the base plate installation method of the seismic isolation device which concerns on embodiment. It is a perspective view which shows the structure of the mounting pedestal used for the base plate installation method. It is a side view which shows the state which the mounting pedestal is fixed to the main bar. It is a top view which shows the state which the mounting pedestal is fixed to the main bar. It is a partially enlarged view for demonstrating the method of height adjustment (leveling) of a base plate by an adjustment bolt. It is a partially enlarged view which shows the state which the adjustment bolt and the base plate are fixed. It is a partially enlarged view for demonstrating the form in the case where the adjustment bolt is fixed to a base plate in advance. It is a partially enlarged view which shows the example of the case where the adjustment bolt is fixed to the base plate via a nut.

Hereinafter, embodiments relating to the method for installing the base plate of the seismic isolation device of the present invention will be described in detail with reference to the drawings. The embodiment shown below is only one of the preferred embodiments for carrying out the present invention, and is a part of the method or one of the members to which the method is applied as long as the effect of the invention is exhibited. Even if the part structure is changed, it can be regarded as a part of the present invention.

[Explanation of installation status of base plate]
First, with reference to FIG. 1, the installation state of the base plate 10 to be installed by the base plate installation method of the seismic isolation device according to the present embodiment will be described. The base plate 10 to which the installation method according to the present embodiment is applied is provided with a plurality of fixing bolts 12 on the back surface side. The method of fixing the fixing bolt 12 to the base plate 10 is not limited. For example, screwing a bolt through a through hole provided in the base plate 10 and fixing it with a nut, direct welding of a long screw to the base plate, or welding a nut to the base plate and attaching a long screw to this nut. Various measures can be taken, such as a screwing method.

Adjusting bolts 14 are fixed to the four corners of the base plate 10. The adjusting bolt 14 is supported by a mounting pedestal 16 provided on a main bar 52 (basic main bar or column main bar) of a structure constituting the lower skeleton 50 of a seismic isolation device (not shown). In the example shown in FIG. 1, the main bar 52 is configured by a long screw (screw reinforcing bar) so that a nut or the like can be screwed.

Further, as shown in FIG. 2, the mounting pedestal 16 is made of a flat steel plate, and the insertion portion 16a of the adjusting bolt 14 is provided in the central portion, and the insertion portion of the main bar 52 is provided on both ends of the insertion portion 16a. 16b is provided. In the example shown in FIG. 2, the adjusting nut 18 is welded to the surface (upper surface) of the flat steel plate constituting the mounting pedestal 16 and corresponding to the insertion portion 16a of the adjusting bolt 14. By screwing the adjusting bolt 14 into the adjusting nut 18, the base plate 10 can be leveled.

In the form shown in FIG. 1, the mounting pedestal 16 is positioned and fixed by being sandwiched by nuts (first nut 20 and second nut 22) screwed into the main bar 52. A plurality of band muscles (hoop muscles) 54 are arranged on the outer periphery of the plurality of main muscles 52 described above so as to cover them. The lower skeleton 50 is extended on the lower surface of the base plate 10 by placing concrete in the arrangement range of the main bar 52 and the band bar (hoop bar) 54.

[How to install the base plate]
When the base plate 10 is in the above-mentioned installation state, the following installation method can be applied.

First, as shown in FIG. 3, a main bar 52 for forming the lower skeleton 50 of the seismic isolation device is arranged, and the mounting pedestal 16 is fixed to the main bar 52. The main bar 52 is arranged so as to follow the cross-sectional shape of the lower skeleton 50, as shown in the plan view in FIG. The mounting pedestal 16 is arranged so as to span the two main bars 52 located near the corners (in the form shown in FIG. 4, the main bars 52b adjacent to the main bars 52a located at the corners) among the main bars 52.

With such an arrangement form, it is possible to avoid interference between the adjusting bolt 14 arranged at the center of the mounting pedestal 16 and the bar arrangement. To fix the mounting pedestal 16, first, the first nut 20 is screwed into the main bar 52 (main bar 52b in the example shown in FIG. 4) to be mounted, and the mounting pedestal 16 is used as a stopper with the first nut 20 as a stopper. 1 Place on nut 20. After that, the height of the mounting pedestal 16 is adjusted by rotating the first nut 20. After adjusting the height of the mounting pedestal 16, the second nut 22 is screwed into the main bar, and the mounting pedestal 16 is sandwiched and fixed by the first nut 20 and the second nut 22. As shown in FIG. 4, the mounting pedestal 16 is preferably provided at all four corners, but should be provided at at least three places. This is because the surface can be surfaced by providing three reference surfaces (mounting pedestal fixing process).

After fixing the mounting pedestal 16 to the main bar 52, the band muscle (hoop muscle) 54 is arranged so as to cover the plurality of main bars 52. It should be noted that the construction of the band reinforcement (hoop reinforcement) 54 may not be performed entirely after the mounting pedestal fixing step, but may be performed first while leaving the adjustment range of the mounting pedestal 16.

After completing the mounting pedestal fixing step and the arrangement of the band bar (hoop bar) 54, the adjusting bolt 14 is screwed into each of the adjusting nuts 18 provided on each mounting pedestal 16 (bolt mounting step).

After the bolt mounting step, the base plate 10 is placed on the upper part of the bolt head of the adjusting bolt 14. Here, the base plate 10 is arranged so as to be hung on each of the plurality of adjusting bolts 14 (plate mounting step).

After the plate mounting step, the base plate 10 is leveled via the adjusting bolt 14. As shown in FIG. 5, the leveling of the base plate 10 is performed by turning the bolt head 14a of the adjusting bolt 14 to adjust the protruding height of the adjusting bolt 14 with reference to the mounting pedestal 16. By adjusting the protruding heights of the plurality of adjusting bolts 14, the height of the seismic isolation device mounting surface on the base plate 10 is adjusted and the level is secured. It is also possible to adjust the horizontal position of the base plate 10 at the same time as leveling the base plate 10. The horizontal position of the base plate 10 may be adjusted by pressing the base plate from the horizontal direction (leveling step).

After the leveling process is completed, the lock nut 24 is screwed into the adjusting bolt 14 from the lower surface side of the mounting pedestal 16, and the flat steel plate constituting the mounting pedestal 16 is inserted between the adjusting bolt 14 and the adjusting nut 18. While tightening so as to sandwich it, the lock nut 24 is fixed to the mounting pedestal 16 as shown in FIG. The lock nut 24 may be fixed by spot welding or the like. By such a step, the rotation of the adjusting bolt 14 is restricted by the action of the double nut, and the adjusting bolt 14 is fixed to the mounting pedestal 16.

After fixing the adjusting bolt 14 to the mounting pedestal 16, the adjusting bolt 14 is fixed to the back surface of the base plate 10. The adjustment bolt 14 may be fixed to the base plate 10 by welding the bolt head 14a in the same manner as the lock nut 24 (fixing step).

[effect]
By mounting the base plate 10 of the seismic isolation device by the method as described above, the level of the base plate 10 can be easily raised without being affected by the unevenness and inclination of the foundation (lower skeleton 50). Further, it is not necessary to form a recess such as a perforation in the concrete constituting the lower skeleton 50, and there is no possibility that the fixing bolt 12 and the adjusting bolt 14 interfere with the main bar 52 and the band bar (hoop bar) 54. Therefore, the base plate 10 can be installed easily and accurately.

[Modification example]
In the above embodiment, after the adjusting bolt 14 is screwed into the mounting pedestal 16, the base plate 10 is placed on the bolt head 14a of the adjusting bolt 14, and after leveling, the adjusting bolt 14 and the base plate 10 are placed. It was stated that it would be fixed. However, if the level can be easily set, the following method may be adopted.

That is, as shown in FIG. 7, the adjusting bolt 14 is fixed in advance on the back surface side of the base plate 10, and the adjusting bolt 14 is placed on the mounting pedestal 16 to perform leveling. When such a method is adopted, the adjusting nut 18 is fixed to the mounting pedestal 16 after the level is adjusted. Further, the through hole forming the insertion portion 16a provided in the mounting pedestal 16 is made sufficiently larger than the diameter of the adjusting bolt 14, so that the displacement in the horizontal direction can be absorbed and the position can be adjusted.

Even when such a method is adopted, the same effect as that of the above embodiment can be obtained. Further, when such a method is adopted, the horizontal position of the base plate 10 with respect to the adjusting bolt 14 can be easily positioned. The adjusting bolt 14 is fixed to the base plate 10 by directly welding to the back surface of the base plate 10 as shown in FIG. 7, and as shown in FIG. 8, a through hole 10a (example shown in FIG. 8) is provided in the base plate 10. Then, a nut 26 may be fixed to the back surface side of the base plate 10 after providing a step hole), and the adjusting bolt 14 may be screwed into the nut 26 to fix the nut 26. With such a configuration, the bolt head 14a of the adjusting bolt 14 is located on the surface side of the base plate 10. Therefore, the adjusting bolt 14 is securely held by the base plate 10.

10 ……… Base plate, 10a ……… Through hole, 12 ……… Fixing bolt, 14 ……… Adjustment bolt, 14a ……… Bolt head, 16 ……… Mounting pedestal, 16a, 16b ……… Insertion Part, 18 ……… Adjustment nut, 20 ……… 1st nut, 22 ……… 2nd nut, 24 ……… Lock nut, 26 ……… Nut, 50 ……… Lower skeleton, 52 (52a, 52a, 52b) ……… Main muscle, 54 ……… Belt muscle (hoop muscle).

Claims (6)

It is a method of installing the base plate in the seismic isolation device.
The pedestal fixing step of fixing the mounting pedestal to the main bar of the lower skeleton of the seismic isolation device, and
The bolt mounting step of mounting the adjusting bolt in contact with the base plate on the pedestal described above, and
The leveling process of adjusting the height of the adjusting bolt with respect to the above-mentioned pedestal and leveling the base plate, and
A method for installing a base plate of a seismic isolation device, which comprises a fixing step of fixing the adjusting bolt to the pedestal described above. Before the bolt mounting process,
The method for installing a base plate of a seismic isolation device according to claim 1, further comprising a bolt fixing step of fixing the adjusting bolt to the back surface of the base plate. After the bolt mounting process,
It has a plate mounting step of mounting the base plate on the adjusting bolt, and also
The method for installing a base plate of a seismic isolation device according to claim 1, wherein the fixing step includes a bolt fixing step of fixing the adjusting bolt and the base plate. The base plate of the seismic isolation device according to any one of claims 1 to 3, wherein the pedestal described above is a flat steel plate, and the leveling is performed via a nut screwed into the adjusting bolt. Installation method. The method for installing a base plate of a seismic isolation device according to claim 4, wherein the adjusting bolt is fixed with a double nut so as to sandwich the pedestal described above from above and below. The method for installing a base plate of a seismic isolation device according to claim 1 or 2, wherein the adjusting bolt is fixed to the base plate via a nut.

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