JP7421886B2 - How to construct a seismically isolated building - Google Patents

Description

The present invention relates to a sliding bearing device that supports a superstructure horizontally movably with respect to a foundation, and a method of constructing a seismically isolated building using this sliding bearing device.

2. Description of the Related Art Seismically isolated buildings in which an upper structure is supported by a seismic isolation device have been known (see Patent Documents 1 and 2).
Patent Document 1 discloses a construction method for a protruding portion of a seismically isolated building. Specifically, we will temporarily install shoring on the foundation to support the floor beams at the overhanging portions, and install sliding bearings that can absorb seismic motion on the shorings, and then construct the overhanging portions above the floor beams. do.

Patent Document 2 discloses a sliding support device for a seismically isolated building that supports the upper structure of the seismically isolated building so that it can be displaced in the horizontal direction from the foundation. A sliding bearing device for a seismically isolated building includes a sliding surface made of resin concrete provided on the upper surface of a foundation, and a column attached to an upper structure and slidably abutting on the sliding surface at a lower bottom surface.
Patent Document 3 discloses a vibration damping device for a strut that damps vibrations of a strut. This vibration damping device for pillars includes a mounting part that is attached to the pillar, a bracket that has a flange part that extends radially outward from the mounting part, rubber that is mounted on the flange part, and a bracket that has a flange part that extends radially outward from the mounting part, and It is equipped with a weight.

Japanese Patent Application Publication No. 2015-175172 Japanese Patent Application Publication No. 2001-115682 Japanese Patent Application Publication No. 2013-148207

An object of the present invention is to provide a method for constructing a seismically isolated building using a sliding bearing device that can be easily installed depending on the height position of a superstructure.

The present inventors proposed a method for constructing a seismically isolated building having a foundation and a superstructure supported by a seismic isolation device on the foundation and having an overhang. By supporting it with a bearing device, even if an earthquake occurs during the construction of a seismically isolated building, the superstructure, including the overhanging parts, can be moved horizontally smoothly. This led to the invention of a method for constructing seismically isolated buildings using this sliding bearing device.
The sliding bearing device of the present invention (for example, the sliding bearing device 50 described below) is attached to an upper structure (for example, A sliding support device for horizontally movably supporting a building main body 40 and an upper floor floor slab 62), comprising a sliding plate (for example, a sliding plate 52 described below) that can slide on the base, and the sliding plate. A vertically extendable jack (for example, a hydraulic jack 54 to be described later) provided on the top of the upper structure is provided, and the jack is bolted to the sliding plate and supports the lower end surface of the upper structure. Features.

According to this invention, the sliding bearing device is provided with a jack. Therefore, by arranging a sliding bearing directly under the upper structure, and then extending the jack appropriately so that the upper end surface of this jack comes into contact with the lower surface of the upper structure, the height of the upper structure can be adjusted. If appropriate, sliding bearing devices can be installed.

The method for constructing a seismically isolated building of the present invention includes a base (e.g., mat slab 20 described below) and an upper structure supported on the base via a seismic isolation device (e.g., seismic isolation device 30 described below). (For example, a building body 40 described below). A step of installing a sliding bearing device (for example, step S2 described below), constructing the upper structure supported by the seismic isolation device, and an overhang portion of the upper structure (for example, an overhang portion 41 described below). The present invention is characterized by comprising a step of supporting the slide support device on the slide bearing device (for example, step S3 described below).

According to this invention, during construction of a seismically isolated building, the superstructure is horizontally movably supported by the installed seismic isolation device. At this time, the overhanging portion of the upper structure is horizontally movably supported by the sliding support device of the present invention. Therefore, even if an earthquake occurs during construction of a seismically isolated building, the upper structure can be smoothly moved horizontally, thereby preventing deformation or damage to the upper structure.

In the method for constructing a seismically isolated building of the present invention, in the step of supporting the overhang portion on the sliding bearing device, a plurality of sliding bearing devices are provided in the vicinity of columns (for example, pillars 61 described below) of the upper structure. It is characterized by

Since the sliding bearing device of the present invention includes a jack for height adjustment, the shear rigidity is low. Therefore, if only one sliding bearing device is provided, the overhanging portion will be supported by pins, resulting in lower structural stability. Therefore, according to the present invention, since a plurality of sliding bearing devices are arranged, the upper structure is supported at a plurality of locations, so that shear rigidity is improved and structural stability can be ensured.

According to the present invention, it is possible to provide a method for constructing a seismically isolated building using a sliding bearing device that can be easily installed depending on the height position of a superstructure.

FIG. 1 is a sectional view of a newly constructed seismically isolated building constructed using a sliding bearing device according to a first embodiment of the present invention. 2 is a flowchart of a method for constructing the seismically isolated building shown in FIG. 1. FIG. FIG. 2 is an explanatory diagram (part 1) of a method for constructing the seismically isolated building shown in FIG. 1; FIG. 2 is an explanatory diagram (Part 2) of the method for constructing the seismically isolated building shown in FIG. 1; 5 is an enlarged view of a portion surrounded by a broken line A in FIG. 4. FIG. 6 is a sectional view taken along line BB in FIG. 5. FIG. FIG. 2 is a side view of the sliding bearing device according to the first embodiment. FIG. 3 is a bottom view of the sliding bearing device according to the first embodiment. It is a sectional view of the seismic isolation layer of the existing building which was seismically isolated using the sliding bearing device according to the second embodiment of the present invention. 10 is a flowchart of the seismic isolation method for the existing building shown in FIG. 9. 10 is an explanatory diagram of a seismic isolation method for the existing building shown in FIG. 9. FIG. 12 is a sectional view taken along the line CC in FIG. 11.

The present invention is a temporary sliding bearing device in which a sliding plate is attached to a jack, and a construction method that uses the sliding bearing device to perform seismic isolation work on an overhang of a seismically isolated building or on a column. The main feature of the sliding bearing device is that it is a sliding bearing device with height adjustment means (jack).
Embodiments of the present invention will be described below based on the drawings. In addition, in the following description of the embodiment, the same constituent elements are given the same reference numerals, and the description thereof will be omitted or simplified.
[First embodiment]
FIG. 1 is a sectional view of a newly constructed seismically isolated building 1 constructed using a sliding bearing device 50 according to a first embodiment of the present invention.
The seismic isolation building 1 has a basic seismic isolation structure, and includes a reinforced concrete mat slab 20 as a base provided on the basement floor, and a steel frame structure supported on the mat slab 20 via a seismic isolation device 30. It includes a building main body 40 as an upper structure.
A retaining wall 21 is constructed around the mat slab 20 to surround the building body 40. The gap between this retaining wall 21 and the building body 40 is a seismic isolation clearance S.
The corner of this building body 40 (the left side in FIG. 1) is a cantilever-supported overhang 41, and this overhang 41 is not supported from below by a seismic isolation device.
The building body 40 is supported by the seismic isolation device 30 and is horizontally movable within the range of the seismic isolation clearance S.

Hereinafter, the procedure for constructing this seismically isolated building 1 will be explained with reference to the flowchart of FIG. 2.
In step S1, as shown in FIG. 3, a mat slab 20 and a retaining wall 21 are constructed.
In step S2, as shown in FIG. 4, the seismic isolation device 30 and the sliding support device 50 are installed on the upper surface of the mat slab 20.
In step S3, as shown in FIG. 4, a building body 40 is constructed on the base isolation device 30 and the sliding bearing device. At this time, the overhanging portion 41 of the building body 40 is supported by the sliding support device 50.
In step S4, the sliding bearing device 50 is removed.

The detailed configuration of the sliding bearing device 50 will be described below.
FIG. 5 is an enlarged view of the portion surrounded by the broken line A in FIG. FIG. 6 is a sectional view taken along line BB in FIG.
A pair of sliding bearing devices 50 are provided for each pillar 42 of the overhanging portion 41. Specifically, the sliding bearing device 50 is disposed on the lower surface of the beam 43 on both sides of the column 42, in the vicinity directly below the column 42.
This sliding bearing device 50 includes a rectangular steel plate 51 as a base placed on the mat slab 20, a sliding plate 52 that can slide on the steel plate 51, and a sliding bearing device 50 that is fixed to the mat slab 20 and supports the steel plate 51. A horizontal movement regulating member 53 that fixes and restricts the horizontal movement of the sliding plate 52, a hydraulic jack 54 provided on the sliding plate 52 that is vertically extendable and retractable, and a cubic shaped member provided on the hydraulic jack 54. It includes a mountain retaining material 55 and an H-shaped steel 56.

The sliding plate 52 is, for example, MC Nylon (registered trademark) manufactured by Mitsubishi Chemical Advanced Materials Co., Ltd., and is fixed to the lower end surface of the hydraulic jack 54 with bolts 57, as shown in FIGS. 7 and 8. This bolt 57 is housed within the thickness of the slide plate 52 so as not to protrude from the lower end surface of the slide plate 52.
Furthermore, grease is applied between the steel plate 51 and the sliding plate 52.
The horizontal movement regulating member 53 is provided on each side of the rectangular steel plate 51. Each horizontal movement regulating member 53 is made of angle iron, one piece serves as a wall portion, and the other piece is fixed to the mat slab 20 with an anchor bolt 58.

According to this embodiment, there are the following effects.
(1) A hydraulic jack 54 is provided on the sliding bearing device 50. Therefore, the sliding bearing device 50 is arranged directly under the overhanging part 41 in the seismic isolation building 1, and then the hydraulic jack 54 is extended appropriately so that the upper end surface of this hydraulic jack 54 comes into contact with the lower surface of the overhanging part 41. This allows the sliding support device 50 to be installed depending on the height of the building body 40.

(2) Since a pair of sliding bearing devices 50 are arranged for each column 42, the building body 40 is supported at multiple locations, improving shear rigidity and ensuring structural stability.
(3) During construction of the seismic isolation building 1, the main body 40 of the building is supported horizontally by the seismic isolation device 30. At this time, the overhanging portion 41 of the building body 40 is supported by a sliding support device 50 so as to be horizontally movable. Therefore, even if an earthquake occurs during construction of the seismically isolated building 1, the building body 40 can be smoothly moved horizontally, so that deformation and damage to the building body 40 can be prevented.

(4) Since the horizontal movement regulating member 53 is provided, even if the sliding plate 52 moves horizontally significantly, the edge of the sliding plate 52 will be locked to the wall of the horizontal movement regulating member 53, and the sliding plate 52 will be connected to the steel plate 51. This prevents it from coming off the top surface.

[Second embodiment]
FIG. 9 is a sectional view of a seismic isolation layer of an existing building 1A that is seismically isolated using a sliding bearing device 50A according to the second embodiment of the present invention.
The existing building 1A is constructed of reinforced concrete, and the base isolation layer of the existing building 1A includes a floor slab 60 as a base, columns 61, and an upper floor slab 62 as an upper structure. This existing building 1A is seismically isolated by removing a portion of the pillars 61 and installing a seismic isolation device 30 in the removed portion.

Hereinafter, the procedure for making the existing building 1A seismic isolation will be explained with reference to the flowchart of FIG. 10.
In step S11, as shown in FIG. 11, sliding support devices 50A are provided on both sides of each column 61. Thereby, the vertical load acting on the column 61 is supported by the sliding support device 50A.
Here, one pair of sliding bearing devices 50A is provided for each column 61. Specifically, the sliding bearing device 50A is disposed near the column 61, here on both sides of the column 61. This sliding bearing device 50A is provided with a mountain retaining member 59 having a predetermined length extending in the vertical direction on the hydraulic jack 54 instead of the mountain retaining member 55 and the H-shaped steel 56 of the sliding bearing device 50.

In step S12, as shown in FIG. 11, a predetermined portion P located at an intermediate height of the column 61 is cut and removed, and the seismic isolation device 30 is installed in the removed predetermined portion P.
In step S13, the vertical load supported by the sliding bearing device 50A is again supported by the column 61.
In step S14, the sliding bearing device 50A is removed.
According to this embodiment, in addition to the above-mentioned (1) to (4), there are the following effects.
(5) When making the existing building 1A seismically isolated, install the sliding bearing device 50A on the floor slab 60 of the current floor, and adjust the height of the sliding bearing device 50A by vertically expanding and contracting the hydraulic jack 54. The sliding bearing device 50A can be easily installed between the floor slab 62 on the upper floor and the floor slab 60 on the current floor.

Note that the present invention is not limited to the above-described embodiments, and any modifications, improvements, etc. that can achieve the purpose of the present invention are included in the present invention.
For example, in each of the embodiments described above, the sliding bearing devices 50, 50A are configured to include the steel plate 51, the sliding plate 52, the horizontal movement regulating member 53, and the hydraulic jack 54, but the sliding bearing device is not limited to this. It may be configured to include a sliding plate that can slide on the base and a vertically extendable jack provided on the sliding plate without providing a steel plate or a horizontal movement regulating member.
Further, in the first embodiment described above, a pair of sliding bearing devices 50 are arranged in the vicinity directly below the pillars 42, but the present invention is not limited thereto. That is, when the stiffness of the retaining material 55 and the H-shaped steel 56 that constitute the sliding bearing device 50 is high, the sliding bearing device 50 may be arranged directly below the pillar 42.

1... Seismic isolation building 1A... Existing building 20... Mat slab (foundation) 21... Retaining wall 30... Seismic isolation device 40... Building body (superstructure) 41... Overhang 42... Column 43... Beam 50, 50A... Sliding support Device 51... Steel plate (base) 52... Sliding plate 53... Horizontal movement regulating member 54... Hydraulic jack 55... Mountain retaining material 56... H-shaped steel 57... Bolt 58... Anchor bolt 59... Mountain retaining material 60... Floor slab (base) 61... Column 62...Upper floor slab (upper structure)
S...Seismic isolation clearance

Claims (1)

A method for constructing a seismically isolated building comprising a foundation and a superstructure supported on the foundation via a seismic isolation device,
A sliding support device comprising a sliding plate that can slide on the base and a jack that is vertically extendable and retractable provided on the sliding plate,
The jack is fixed to the sliding plate with bolts and supports the lower end surface of the upper structure,
The bolt does not protrude from the lower surface of the sliding plate,
installing the seismic isolation device and the sliding bearing device on the upper surface of the foundation;
The upper structure is constructed by being supported by the seismic isolation device, and the lower surfaces of the beams on both sides of the pillars of the overhang portion supported cantilevered at the corners of the upper structure are temporarily supported by the sliding support device. A method for constructing a seismically isolated building, comprising the steps of:

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