JPH10292668A - Construction method for fitting base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the replacing work, and to secure the fitting accuracy by temporarily fixing a support material and a lower base plate to a recessed part arranged on a foundation concrete floor surface, and placing concrete so as to fit a device main body to a top surface of the base plate. SOLUTION: At the time of placing a foundation concrete floor surface 2, a fitting part of a device main body is formed with a recessed part 3, and a form is formed in the periphery of the recessed part 3. Concrete is placed through a hole 1a of a lower base plate 1 from a bottom surface of the recessed part 3 to a height of a lower surface of the lower base plate 1 so as to form a fitting part 10. Continuously, the form is removed after forming the fitting part 10, and while a bolt 7 is removed from a long nut 8, and all of a pair of support materials 4 and receives 5 are removed. The lower base plate 1 is thereby integrated with the fitting part 10, and a lower surface of the device main body is fitted onto the base plate 1. With this structure, the device main body is easily replaced by removing the bolt and each flange of the top surface and the lower surface of the device main body, and the work execution efficiency and fitting accuracy are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a seismic isolation device installed at a lower part of a building.

[0002]

2. Description of the Related Art In a conventional mounting method of a seismic isolation device for a building, a base plate receiving base B is arranged and fixed on a base bottom A as shown in FIG. Thus, a mounting portion E is formed, and a lower flange portion of the seismic isolation device main body F is fixed to the base plate C by a nut G. In order to tighten the nut G, a long nut H for screwing the nut G is welded to the base plate C in advance, and an anchor bolt I is suspended from the long nut H.
In addition, as shown in FIG. 6, the upper base plate L and the lower base plate M are interposed between the upper and lower surfaces of the seismic isolation device main body F and the concrete surfaces J and K of the upper and lower mounting portions to ensure accuracy. Is usually the case.

[0003]

According to the above-mentioned conventional mounting method, it is difficult to secure the accuracy of the base plate C when the mounting portion E is formed by the base plate receiving base B.
The installation of the base plate C requires a base plate receiving base B, and the base plate receiving base B is buried in the concrete D which has been cast. In addition, of the base plates interposed between the upper and lower surfaces of the seismic isolator main body, the lower base plate is necessary for ensuring accuracy when setting the seismic isolator main body, but the upper plate is directly connected to the upper surface of the seismic isolator main body with concrete. There is no problem in terms of accuracy even if the casting is performed. Therefore, if the upper base plate is abolished, there is a possibility that cost reduction and rationalization of construction may be achieved, but problems such as difficulty in replacing the seismic isolation device main body and errors in accuracy after replacement arise.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and a lower base plate can be easily attached without using a conventional base plate receiving base. It is an object of the present invention to provide a method of mounting a seismic isolation device that can be easily replaced and maintain accuracy.

[0005]

As a specific means for achieving the above object, the present invention relates to a method for mounting a base concrete floor surface in a case where a lower surface of a seismic isolation device body is received and attached to a lower base plate. A recess is provided in the mounting part of the seismic isolation device main body, a support material is temporarily fixed to the upper portion of the recess, and the lower base plate is temporarily fixed under the support material, and a plurality of lower base plates are provided on the lower surface of the lower base plate. An anchor bolt is suspended, concrete is poured from a concrete filling hole formed in the lower base plate, and concrete is poured into the recess and the lower surface of the lower base plate to fix the lower base plate. The gist of the present invention is to remove and attach the lower surface of the seismic isolation device body to the upper surface of the lower base plate. Also, an adjusting plate is mounted on the upper surface of the seismic isolation device via a long nut and a mounting bolt, an anchor bolt is erected on the long nut, and concrete is cast on the adjusting plate to form a footing. The gist is that.

[0006]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIGS. 1 and 2 show a method of installing a lower base plate 1. First, when a foundation concrete floor 2 is cast, a recess 3 is formed at a location to be a mounting portion of a seismic isolation device body (not shown). I do.

Next, a pair of support members 4 are extended over the recesses 3 and temporarily fixed. That is, the support member 4 is formed of a steel material having an L-shaped cross section, and has a box-shaped leg portion 4a having a side opening at both ends.
The legs 4a are respectively fixed to a pair of receiving members 5 temporarily fixed to the foundation concrete floor surface 2 so as to face both sides of the concave portion 3 by bolts. The support member 4 can be easily leveled out by adjusting the height adjustment bolt 6 as shown in FIG.

The lower base plate 1 is made of steel and is formed in a circular shape. A hole 1a for filling concrete is formed in the center of the lower base plate 1, and mounting holes 1b are circumferentially provided at regular intervals in a peripheral portion. It is provided along. The lower base plate 1 is temporarily fixed to the lower surfaces of the pair of support members 4 with bolts 7 using several mounting holes 1b at appropriate positions.

The bolt 7 is screwed to a cylindrical long nut 8 attached to the lower surface of the lower base plate 1, and an anchor bolt 9 is attached to a lower portion of the long nut 8. The bolt 7, the long nut 8, and the anchor bolt 9 are all mounted on the remaining mounting holes 1 b not involved in the mounting of the lower base plate 1. Therefore,
The lower base plate 1 is held in a suspended state on the lower surfaces of the pair of support members 4, and the plurality of anchor bolts 9 are suspended in the recess 3.

Thereafter, a formwork (not shown) is formed around the recess 3 and concrete is poured from the hole 1a of the lower base plate 1 so that the concrete reaches the height from the bottom surface of the recess 3 to the lower surface of the lower base plate 1. And the mounting portion 10 is formed. As a result, both the long nut 8 and the anchor bolt 9 are embedded in the mounting portion 10, and the lower base plate 1 is fixed to the upper surface of the mounting portion 10. Then, after the formation of the mounting portion 10, the mold is removed and the bolt 7 is removed from the long nut 8, and the pair of support members 4 and the receiving member 5 are all removed.

In this way, if the lower base plate 1 is provided integrally with the mounting portion 10, the conventional base plate receiving base B becomes unnecessary, and the support member 4 is not embedded in the mounting portion 10. , And can be diverted to another mounting part and re-arranged. In addition, since all operations can be performed on the foundation concrete floor 2, the operation is easy and the construction efficiency can be significantly improved.

A lower surface (a flange (not shown)) of the seismic isolation device is mounted on the lower base plate 1 using the mounting holes 1b and the bolts 7. In this case, the mounting accuracy of the lower base plate 1 is about ± 2 mm, and furthermore, there is no reinforcement of the foundation concrete floor surface 2 in the recess 3 and there is no interference by this reinforcement, so that the accuracy of the seismic isolation device body is Can be easily secured.

FIG. 3 shows a conventional steel base plate 11 having a thickness of about 4.
This figure shows a method of mounting with an adjustment plate 12 of about 5 mm interposed.

In this case, as shown in FIG. 4, mounting holes 11b are provided in the upper flange portion 11a of the main body 11 of the seismic isolation device at regular intervals along the circumferential direction. Correspondingly, the adjusting plate 12 is provided with a through hole 12a, a cylindrical long nut 13 is arranged by aligning the mounting hole 11b and the through hole 12a, and a bolt 14 is inserted from below the flange portion 11a by the long nut. 13, and an anchor bolt 15 is screwed into an upper portion of the long nut 13, so that the adjustment plate 12
Is fixed. Thereafter, a mold (not shown) is formed using the adjustment plate 12, and concrete 16 is cast to form an upper mounting portion 17 (footing or the like).

When the main body 11 of the seismic isolation device and the mounting portion 17 are integrated as described above, the long nut 13 and the anchor bolt 15 are buried in the mounting portion 17.
The adjustment plate 12 is fixed to the lower surface of the plate 7. Accordingly, the conventional upper base plate L is not required, and the mounting work of the upper base plate L can be omitted, so that the cost can be reduced and the construction efficiency can be improved.
When the concrete 16 is cast, if the bolts 14 are supported from below so as not to fall down, the bolt 16 is fixed by the concrete 16 after the casting, so that the welding of the long nut 13 becomes unnecessary.

At the time of replacement of the seismic isolation device main body 11, if the bolt 14 is removed, the upper surface flange portion 1 of the seismic isolation device main body 11 is removed.
1a can be removed from the upper mounting portion 17. Furthermore, if the bolt 18 holding the lower surface flange 11c is removed,
The seismic isolation device body 11 can be replaced.

At the time of this replacement, the adjusting plate 12 remains on the upper mounting portion 17 side, so that the lower surface of the concrete 16 is not exposed, the replacement work of the seismic isolation device body can be easily performed, and a new seismic isolation device can be used. This facilitates the setting of the apparatus main body and helps to ensure its accuracy.

[0018]

As described above, according to the first aspect of the present invention, the lower base plate can be easily attached by the suspension method, so that the conventional base plate receiving base is not required, and the suspension base for the suspension can be used. Since the supporting material is not buried in the cast concrete and can be removed and diverted and replaced, the efficiency of construction, the accuracy of mounting and the cost can be reduced. In addition, the work can be performed on the foundation concrete floor surface, which facilitates construction and improves workability. In addition, the mounting part of the seismic isolation device main body does not receive interference with the reinforcement of the foundation concrete floor, so it is easy to secure accuracy. It has excellent effects such as being able to be used. Further, claim 2
According to the invention, the mounting portion can be formed on the upper surface of the main body of the seismic isolation device via the adjustment plate, so that the conventional upper base plate is not required, and the cost can be reduced and the construction can be rationalized. In addition, the adjustment plate can also be used as a part of the formwork when placing concrete, preventing exposure of the concrete bottom surface when replacing the seismic isolation device body, enabling easy replacement work and ensuring accuracy. It has excellent effects such as becoming.

[Brief description of the drawings]

FIG. 1 is a plan view showing a method of installing a lower base plate by a suspension method according to the present invention.

FIG. 2 is a sectional view of a main part of the same.

FIG. 3 is a schematic cross-sectional view showing a method of mounting an upper part of a seismic isolation device via an adjustment plate according to the present invention.

FIG. 4 is an enlarged sectional view of a main part of the same.

FIG. 5 is an explanatory view showing a mounting state using a conventional base plate receiving gantry.

FIG. 6 is an explanatory view showing a mounting state using a conventional upper and lower base plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lower base plate 2 ... Foundation concrete floor surface 3 ... Recess 4 ... Support material 5 ... Receptacle 6 ... Height adjustment bolt 7 ... Bolt 8 ... Long nut 9 ... Anchor bolt 10 ... Mounting part 11 ... Seismic isolation device main body 12 ... Adjustment plate 13 ... Long nut 14 ... Bolt 15 ... Anchor bolt 16 ... Concrete 17 ... Mounting part 18 ... Bolt

Claims (2)

[Claims] When a lower surface of a main body of a seismic isolation device is received and mounted on a lower base plate, a recess is provided in a base concrete floor surface at a mounting portion of the main body of the seismic isolation device, and a support member is provided on an upper portion of the recess. The lower base plate is temporarily fixed under the support material, and a plurality of anchor bolts are hung on the lower surface of the lower base plate, and concrete is poured from a concrete filling hole formed in the lower base plate. The lower base plate is fixed by pouring concrete up to the lower surface of the recess and the lower base plate, and thereafter, the support material is removed and the lower surface of the seismic isolation device body is attached to the upper surface of the lower base plate. To install seismic isolation devices. 2. An adjusting plate is mounted on an upper surface of a seismic isolation device main body via a long nut and a mounting bolt, an anchor bolt is erected on the long nut, and concrete is cast on the adjusting plate for footing. A method of mounting a seismic isolation device, characterized by forming