JPH10184032A - Method and apparatus for base isolation of already-constructed building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a base isolation unit without setting a support device temporarily in working a base isolation execution to a already-constructed building. SOLUTION: A hole 11 is made perpendicularly intersecting the central part of a already-installed pillar 1, and four corners 1a of the pillar are allowed to remain. Vertical forces are exerted at the four corners 1a of the remained pillar. The base isolation unit is divided into a crisscross main body and quadrant corners and, at first, the main body 14a of a recess surface plate is inserted into the hole 11 to be situated at the central part of the pillar, and then a joint 15 and the main body 16a of a slider are set thereon likewise. The upper part of the hole 11 is filled back with concrete so as to connect integrally the main body 26a of the slider and already-installed pillar 1. After that, remaining four corner lower ends of the pillar 1 around the crisscross main body 14a and 16a are removed, and corners of the base isolation unit are installed adjacent to the main body 14a and 16a, thereby restoring the base isolation unit into its original shape integrally and installing a base isolation unit of a frictional pendulum bearing type into the ready existed pillar 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation method for an existing building and a seismic isolation device, and more particularly to a seismic isolation method for installing a seismic isolation device at an intermediate portion of an existing pillar and a method for use in the method. Related to seismic isolation devices.

[0002]

2. Description of the Related Art In order to retrofit an existing building with earthquake resistance,
While ensuring safety without compromising the strength of the building,
It is necessary to carry out renovation work without stopping the use of buildings as much as possible. Since the first floor and the basement floor of the building have many users, the middle seismic isolation method is being developed to install a seismic isolation device in the middle of the existing pillars on the middle floor above the second floor.

[0003] An example of a conventional intermediate seismic isolation method is as follows.
As shown in FIG. 20, first, a supporting device 2 is temporarily installed on an existing pillar 1 having an RC structure to be subjected to intermediate seismic isolation. This supporting device 2 is composed of an upper reinforcing metal member 3, a lower reinforcing metal member 4, and a jack 5. The upper reinforcing metal member 3 and the lower reinforcing metal member 4 are fixed to the existing column 1 with anchor bolts. A jack 5 is interposed between the bracket 4 and the metal fitting 4.

[0004] Next, as shown in FIG.
Is crushed by a concrete breaker, a wire saw, or the like to remove the intermediate portion of the existing pillar 1 temporarily provided. And
As shown in FIG. 22, the laminated rubber seismic isolation device 6 is inserted and fixed to the middle part of the existing column 1 from which concrete and reinforcing bars have been removed.

The seismic isolation device 6 is formed by alternately laminating a plurality of steel plates and rubber plates. The seismic isolation device 6 supports a vertical load of a heavy object such as a building with good stability, and has a longer period than an oscillation period during an earthquake. It swings a heavy object at low speed in the horizontal direction, reduces the input acceleration of the earthquake and improves the earthquake resistance.

After the above-mentioned construction has been performed on each pillar on the same floor of the building, the jack 5 of the support device 2 is loosened to remove the upper reinforcing metal fitting 3.
23 and the anchor bolts of the lower reinforcing bracket 4 are removed, and FIG.
As shown in (2), if the supporting device 2 is removed from the existing pillar 1, the intermediate seismic isolation construction is completed.

[0007]

In the conventional intermediate seismic isolation method, in order to completely remove the middle part of the existing column, the vertical force and the horizontal force acting on the existing column are applied until the seismic isolation device is installed. A supporting device must be temporarily installed. Therefore, a support member such as a large reinforcing metal fitting or a jack is required, and the temporary work of the support device is also troublesome.

Therefore, when performing seismic isolation work on an existing building, there arises a technical problem to be solved in order to attach the seismic isolation device without temporarily installing a support device.
An object of the present invention is to solve this problem.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and a hole which penetrates an existing column from one side through the center to the other side is provided at the center of the column. First, the main body of the concave plate of the divided seismic isolation device is inserted into the hole in an inclined or upright state, and the main body of the concave plate is inserted at the center of the column. It is placed in a horizontal state, and then the body part of the articulated slider of the divided seismic isolation device is inserted into the hole in an inclined or upright state, and the body part of the articulated slider is placed horizontally at the center of the column. In this state, it is set on the main body of the concave plate, and thereafter, the hole above the main body of the articulated slider is backfilled with concrete, so that the main body of the articulated slider and the existing pillar are integrated. To the concave plate and the articulated slider. Remove the lower end of the four corners of the pillars remaining around the body, remove the divided concave plate and the corners of the articulated slider adjacent to the main body, seismic isolation method of existing buildings, and stainless steel A friction pendulum bearing type seismic isolation device having an articulated slider mounted on a concave plate, wherein the concave plate and the articulated slider are each divided into a cross-shaped main body in plan view and four corners. To provide seismic isolation devices.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, as shown by the two-dot chain line in FIG. 1, the lower part of the existing column 1 of the RC structure for the middle seismic isolation is cut by a machine equipped with a concrete breaker and a cutting bit,
A hole 11 penetrating from one side through the center of the pillar to the other side is drilled. The hole 11 is vertically long when viewed from the front, and is formed to have a size that allows the main body of the divided seismic isolation device to be inserted as described later.

As shown in FIG. 2, two holes 11 are formed in a cross shape in a sectional view so as to be orthogonal at the center of the column 1.
Accordingly, the four corners 1a of the remaining columns support the vertical force during the seismic isolation construction. Reference numeral 12 denotes a main reinforcing bar in the existing column 1. After the main reinforcing bar 12 exposed in the hole 11 is cut off, concrete is exposed to expose the end thereof, and the hole 11 is formed in a step described later. When a backfill is made, a reinforcing bar is connected to the main reinforcing bar 12.

Here, as a seismic isolation device mounted on a pillar of a building, a laminated rubber type and a friction pendulum bearing type are known. In the present invention, a friction pendulum bearing type seismic isolation device 13 shown in FIGS. 3 and 4 is used. The seismic isolation device 1
In 3, a slider 16 with a joint 15 is placed on a concave plate 14 made of stainless steel, and a liner made of synthetic resin having high lubricity is attached to the lower surface of the joint 15. When an earthquake occurs, the slider 16 with the joint 15 slides along the concave plate 14 and generates a small pendulum motion on the supporting column. At this time, the movement of the slider 16 generates a kinetic friction force, which absorbs seismic energy and reduces the force transmitted to the upper part of the building.

In the present invention, the seismic isolation device 13 is divided in advance as shown by a two-dot chain line. That is, the concave plate 14 is divided into a cross-shaped main body portion 14a and four corner portions 14b in plan view, and the slider 16 is also divided into a cross-shaped main body portion 16a in plan view and four corner portions 16b. The joint 15 is a slider 16
It is detachable from.

Then, as shown in FIG. 5, the main body portion 14a of the divided concave plate is inserted into the hole 11 of the column 1 in an inclined or upright state, and as shown in FIG. Then, the main body 14a of the concave plate is placed in a horizontal state so as to match the holes 11 orthogonal to each other. After placing the main body 14a of the concave plate, the joint 15 is inserted through the hole 11, and as shown in FIG. 7, the joint 15 is placed at the center of the main body 14a of the concave plate.

Subsequently, as shown in FIG. 8, the main body 16a of the divided slider is inserted into the hole 11 of the column 1 in an inclined or upright state, and as shown in FIG. 9 and FIG. The slider main body 16a is set in a horizontal state so as to align with the holes 11 orthogonal to each other, and set on the concave plate main body 14a via the joint 15.

Next, as shown in FIGS. 11 and 12, a pedestal 17 is fixed below the concave plate main body 14a, and the concave plate main body 14a is fixed with anchor bolts. A reinforcing bar 18 is arranged in the hole 11, and the main reinforcing bar 12 in the existing column 1 and the upper end of the reinforcing bar 18 are closed-welded at the ceiling of the hole 11, and the lower end of the reinforcing bar 18 is provided. Is connected to the main body 16a of the slider.

After that, if the hole 11 above the main body 16a of the slider on which the reinforcing reinforcing bar 18 is arranged is back-filled with concrete, as shown in FIGS. 13 and 14, the main body 16a of the slider and the existing pillars are formed. 1 are integrally connected.
Further, the main body 16a of the slider and the main body 14 of the concave plate are provided.
As shown in FIGS. 15 and 16, the lower end 1b of each of the four corners of the column remaining around “a” is removed by cutting with a machine equipped with a concrete breaker and a cutting bit.

Then, as shown in FIGS. 17 and 18,
The divided corners 14b of the concave plate are aligned with the main body 1 of the concave plate.
The corners 14b of each concave plate are fixed to the pedestal 17 with anchor bolts. Further, the corners 16b of the divided sliders are sequentially installed adjacent to the main body 16a of the slider, and the corners 16b of each slider are fixed to the column 1 with anchor bolts.

Therefore, the main body 1 of the divided concave plate is
4a and the corners 14b are aligned and integrated, and the divided slider body 16a and the corners 16b are aligned and integrated to return to the original shape described with reference to FIGS. , A seismic isolation device 13 including a concave plate 14 and a slider 16 with a joint 15 is formed.

Thus, as shown in FIG. 19, the frictional pendulum bearing type seismic isolation device 13 is mounted at the lower position of the existing column 1, and the load applied to the existing column 1 is entirely reduced. 13 will be received, and the intermediate seismic isolation construction of the existing building will be completed.

Therefore, the present invention can be variously modified without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

[0022]

As described above, according to the present invention, a hole is formed in the center of an existing column, and the four corners of the column are left, thereby supporting the vertical force during seismic isolation work at the remaining portion. Therefore, the seismic isolation device can be installed on the existing pillar without temporarily installing the support device. Since the seismic isolation device is divided into a main body and a corner, the main body of the seismic isolation device is first installed at the center of the column, and the vertical force is supported by the main body of the seismic isolation device. The corners of the seismic isolation device will be installed next to the main body.

In this way, when performing seismic isolation work on an existing building, the seismic isolation device can be attached without temporarily installing a support device, so that the construction can be easily performed while ensuring safety at the time of construction. It is possible to improve the earthquake resistance of existing buildings at low cost.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a front view of a first step of a seismic isolation method.

2 (a) is a front view of a second step of the seismic isolation method, and FIG. 2 (b) is a sectional view taken along line AA of FIG. 2 (a).

FIG. 3 shows the embodiment of the present invention and is a plan view of a seismic isolation device.

FIG. 4 is a sectional view taken along line BB of FIG. 3, showing the embodiment of the present invention;

FIG. 5 shows the embodiment of the present invention and is a front view of a third step of the seismic isolation method.

6 (a) is a front view of a fourth step of the seismic isolation method, and FIG. 6 (b) is a sectional view taken along the line CC of FIG. 6 (a), showing the embodiment of the present invention.

7 (a) is a front view of a fifth step of the seismic isolation method, and FIG. 7 (b) is a sectional view taken along line DD of FIG. 7 (a), showing the embodiment of the present invention.

FIG. 8 shows the embodiment of the present invention, and is a front view of a sixth step of the seismic isolation method.

9 (a) is a front view of a seventh step of the seismic isolation method, and FIG. 9 (b) is a sectional view taken along line EE of FIG. 9 (a).

FIG. 10 illustrates an embodiment of the present invention, and illustrates F of FIG. 9 (a).
-F line sectional drawing.

FIG. 11 shows an embodiment of the present invention, and illustrates an eighth embodiment of the seismic isolation method.
The partially cutaway front view of a process.

FIG. 12 shows an embodiment of the present invention, and shows GG of FIG. 11;
Line sectional view.

FIG. 13 shows an embodiment of the present invention, and describes the ninth method of the seismic isolation method.
The partially cutaway front view of a process.

FIG. 14 shows an embodiment of the present invention,
Line sectional view.

FIG. 15 shows an embodiment of the present invention and is a first example of a seismic isolation method.
FIG.

FIG. 16 shows an embodiment of the present invention, and shows II in FIG.
Line sectional view.

FIG. 17 shows an embodiment of the present invention and is a first example of a seismic isolation method.
The front view of one process.

FIG. 18 shows an embodiment of the present invention, and corresponds to JJ in FIG. 17;
Line sectional view.

FIG. 19 shows the embodiment of the present invention, and is a front view of a state in which the seismic isolation method has been completed.

FIG. 20 is a front view of the first step of the seismic isolation method, showing the prior art.

FIG. 21 is a front view of a second step of the seismic isolation method, showing a conventional technique.

FIG. 22 is a front view of a third step of the seismic isolation method, showing the prior art.

FIG. 23 is a front view of the fourth step of the seismic isolation method, showing the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing pillar 1a Four corners of pillar 1b Lower end of four corners of pillar 11 Hole 13 Seismic isolation device 14 Concave plate 14a Main body of concave plate 14b Corner of concave plate 15 Joint 16 Slider 16a Main body of slider 16b Corner of slider

Claims (2)

[Claims] 1. An existing pillar is provided with two holes penetrating from one side through the center to the other side so as to be orthogonal to the center of the pillar. The main body of the face plate is inserted into the hole in an inclined or upright state, and the main body of the concave plate is placed horizontally at the center of the column. Insert the main body part into the hole in an inclined or upright state, set the main body part of the articulated slider in a horizontal state at the center of the column, and set it on the main body part of the concave plate.
The hole above the main body of the articulated slider is back-filled with concrete to integrally connect the main body of the articulated slider and the existing pillar. Remove the lower corners of the remaining pillars,
A method for seismic isolation of an existing building, wherein a divided concave plate and a corner of a slider with articulation are installed adjacent to the main body. 2. A friction pendulum bearing type seismic isolation device having a stainless steel concave plate and an articulated slider mounted thereon, wherein the concave plate and the articulated slider have a cross-shaped main body and The seismic isolation device used in the construction method according to claim 1, wherein the seismic isolation device is divided into two corners.