JPH1113306A - Building supporting method at installation of vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a structurally rational building supporting method having excellent workability and profitability by ensuring safety during the execution of works while securing safety during the future replacement works of a vibration isolation device when a strong or small earthquake, a strong wind or the load of execution are generated during the execution of works. SOLUTION: The reinforced-concrete-constructed lower foundation 1 and lower footing beam 2 of the vibration isolation devices are executed, a reinforced-concrete-constructed reinforcing wall 3 is executed onto the lower footing beam 2, the vibration isolation devices 4 are set onto the lower foundation 1, and reinforced-concrete-constructed upper foundations 5 and an upper footing beam 6 are built. The upper footing beam 6 and the lower footing beam 2 are unified through the reinforcing wall 3 and reinforcing works are completed, and a superstructure is executed and the reinforcing wall 3 is cut and changed into vibration isolation structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to securing safety when a small or medium-sized earthquake, strong wind, or construction load occurs during construction of a base-isolated structure, and securing construction safety when exchanging a base-isolated device. The method according to the present invention relates to a method of supporting a building in which the above-mentioned is planned.

[0002]

2. Description of the Related Art When a building is being constructed, a seismic isolation device is liable to be displaced horizontally, so that displacement in a horizontal direction is generally restrained. FIG. 6 shows an example of this, in which the lower foundation a and the foundation beam of the seismic isolation device are installed, the seismic isolation device b is installed, and the upper foundation c and the foundation beam d are installed.

Further, a horizontal displacement restraint support f is interposed between the upper foundation c and the retaining wall e so that the seismic isolation layer does not move laterally during construction. FIG. 7 shows another conventional example, in which a temporary brace g is provided between a lower foundation a and an upper foundation beam d. After attaching the horizontal displacement restricting member in this way, the upper structure is constructed, and the horizontal displacement restricting member is removed.

[0004]

When the building becomes high-rise, the external force generated during construction increases, and in the former case, the horizontal displacement restraining support must be large and rigid. In the latter case, the amount of steel material of the braces required for reinforcement increases. The present invention has been proposed in view of the problems of the prior art described above, and its purpose is to ensure safety during construction when a small or medium-sized earthquake, strong wind, or construction load occurs during construction. To ensure safety during the replacement of seismic isolation devices in the future,
It is an object of the present invention to provide an economical and structurally reasonable method of supporting a building when installing a seismic isolation device.

[0005]

In order to achieve the above-mentioned object, a method of supporting a building at the time of installing a seismic isolation device according to the present invention comprises: constructing a reinforced concrete lower foundation and a lower foundation beam of the seismic isolation device; A reinforced concrete reinforcing wall is constructed on the lower foundation beam, then a seismic isolation device is set on the lower foundation, and then an upper foundation and an upper foundation beam of reinforced concrete are constructed, and then the upper foundation beam and the lower foundation Complete the reinforcement work by integrating the beam via the reinforcing wall,
After constructing the upper structure, the reinforcing wall is cut and converted into a seismic isolation structure.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing preferred embodiments of the present invention. As shown in the kana-dori figure of FIG. 1 and the base plan of FIG. 2, the reinforced concrete lower foundation 1 and the lower foundation beam 2 of the seismic isolation device are constructed, and the reinforced concrete reinforcing wall 3 is constructed on the lower foundation beam 2. I do.

Next, the seismic isolation device 4 is set on the lower foundation 1. Next, the upper foundation 5 made of reinforced concrete
Then, the upper foundation beam 6 is constructed, and the upper foundation beam 6 and the lower foundation beam 2 are integrated via the reinforcing wall 3 to complete the reinforcement. Next, the superstructure is constructed, and after the construction is completed, the reinforcing wall 3
Is cut and converted to a seismic isolation structure. In the drawing, 3a indicates a cut portion of the reinforcing wall 3.

As described above, in the above embodiment, the use of reinforced concrete reinforcing walls instead of braces and horizontal displacement restraint supports as the reinforcing material facilitates the work by performing the same type of work from the foundation work. Construction costs are also reduced, and wall reinforcement is most advantageous in reinforced concrete structures. In addition, the size, the number, the amount of reinforcement, etc. of the reinforcing wall 3 are examined by a small earthquake recorded near the site.

FIG. 3 and FIG. 4 show an embodiment in which the present invention is applied to secure the safety of construction when replacing the seismic isolation device. Bolts 7 are installed above and below the reinforcing wall 3 with chemical anchors or the like. (Refer to FIG. 3) The reinforcing plate 8 and the bolt 7 are tightly connected, and the reinforcing plate 8 resists an external force when the seismic isolation device 4 is replaced. Next, the seismic isolation device 4 is replaced by jacking up with the jack 9 disposed between the upper and lower foundations 5 and 1.

FIG. 5 shows a process of replacing the seismic isolation device. The jack 9 is set between the foundation on the first floor and the base on the floor of the seismic isolation device, and the lower anchor bolt 10 of the jack is removed.
(See FIG. 5 (a).) Next, jack-up is performed, and a gap 13 of about 2 to 3 mm is provided between the lower flange 11 and the anchor plate 12 of the seismic isolation device. Remove the upper anchor bolt 10 'of the vibration device 4,
Finally, jack-up of about 5 mm is performed. In addition, it is reinforced by a temporary support such as a shoring if necessary.
(See Fig. 5 (b).) Then, remove the seismic isolation device by sliding it with a chill hole, lever block, or the like. The horizontal movement of the seismic isolation device is performed using a bullet truck or the like. (FIG. 5
(See (c).) Then, the new seismic isolation device 4 'is slid in the same manner as in (c) and installed at a predetermined position. (See FIG. 5 (d).) Next, jack down is performed while tightening the anchor bolts 10, 10 ', and the anchor bolt 10 is fully tightened with the jack 9 completely lowered, and the jack 9 is removed. (See Fig. 5 (e).) When replacing the seismic isolation device by jacking up in this way,
The reinforcing plate 8 connected to the reinforcing wall 3 resists external force when the seismic isolation device is replaced.

[0011]

As described above, according to the present invention, a reinforced concrete lower foundation and a lower foundation beam of a seismic isolation device are constructed, a reinforced concrete reinforcing wall is constructed on the lower foundation beam, and the seismic isolation device is constructed on the lower foundation. After setting, a reinforced concrete upper foundation and an upper foundation beam are constructed, and the upper foundation beam and the lower foundation beam are integrated through the reinforcing wall to complete the reinforcement work. Reinforced concrete reinforcement walls are used instead of braces and horizontal displacement restraint supports to ensure safety during the construction of seismic isolation structures, so the construction of reinforcement walls is a series of flows from the foundation and foundation beams, and construction is the same The cost is also reduced.
In reinforced concrete construction, wall reinforcement is most advantageous, especially when the building is high-rise and the expected external force is large, it is structurally advantageous compared to conventional temporary braces and horizontal supports.

After the completion of the reinforcing work by the reinforcing wall, the building can be converted into a seismic isolation structure by cutting the reinforcing wall after constructing the upper structure. As described above, according to the present invention, when a small-to-medium-sized earthquake, strong wind, or construction load occurs during construction of the base-isolated structure, safety during construction is ensured. The invention according to claim 2 is characterized in that the bolts are installed above and below the reinforcing wall when the seismic isolation device is replaced, and the bolts are tightened with the reinforcing plate in which each bolt hole is vertically loosened, and the bolts are used. Since the seismic isolation device was replaced by jacking up to resist the external force at the time of replacement, it is possible to maintain the safety of construction when replacing the seismic isolation device, and it is difficult to understand whether it will occur in the future The replacement of the seismic isolation device that does not have the cost of replacing the seismic isolation device at this stage is not required at this stage.

[Brief description of the drawings]

FIG. 1 is a perspective view of a building when a seismic isolation device according to the present invention is installed.

FIG. 2 is a floor plan of the building of FIG. 1;

FIG. 3 is a perspective view of a building when a seismic isolation device is replaced.

FIG. 4 is a diagram illustrating a reinforcement state of the building of FIG. 3;

FIGS. 5 (a), (b), (c), (d), and (e) are explanatory diagrams of steps when the seismic isolation device is replaced.

FIG. 6 is a longitudinal sectional view showing an example of a conventional structure.

FIG. 7 is a longitudinal sectional view showing another example of the conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower foundation 2 Lower foundation beam 3 Reinforcement wall 3a Reinforcement wall cutting part 4 Seismic isolation device 4 'New seismic isolation device 5 Upper foundation 6 Upper foundation beam 7 Bolt 8 Reinforcement plate 9 Jack 10 Lower anchor bolt 10' Upper anchor bolt 11 Lower part Flange 12 Anchor plate 13 Clearance

Claims (2)

[Claims] 1. A reinforced concrete lower foundation and a lower foundation beam of a seismic isolation device are constructed, a reinforced concrete reinforcing wall is constructed on the lower foundation beam, and a seismic isolation device is set on the lower foundation. After that, the upper foundation and the upper foundation beam of the reinforced concrete structure are constructed, and then the upper foundation beam and the lower foundation beam are integrated via the reinforcement wall to complete the reinforcement work, and after the upper structure is constructed, the reinforcement wall is cut. A method of supporting a building when installing a seismic isolation device, characterized in that the building is converted into a seismic isolation structure. 2. A bolt is installed above and below the reinforcing wall, and then resists an external force at the time of exchanging the seismic isolation device. Each bolt hole tightens a reinforcing plate formed into a vertical loose hole and the bolt. 2. The method according to claim 1, wherein the seismic isolation device is replaced by jacking up the upper foundation via a jack interposed between the lower foundation and the upper foundation.