JP2024021893A - Extension method for base-isolated building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extension method for a base-isolated building capable of quickly securing structural safety of the base-isolated building even when an earthquake occurs under construction of the extension part.

SOLUTION: There is provided an extension method of a base-isolated building for constructing an extension building 3 to an existing building 2. Namely, it includes: steps S2, S3 of constructing a part of the extension building 3 on a newly constructed base-isolation device 50 by installing the newly constructed base-isolated device 50 of the extension building 3; step S4 of constructing parts other than a connection part with the existing building 2 among the rest of the extension building 3; step S5 of limiting lateral distance between the existing building 2 and the extension building 3 within a management reference value range of base-isolation clearance by a jack 70 when the lateral distance between the existing building 2 and the extension building 3 is out of the management reference value range of base-isolation clearance; step S6 of connecting a right-upper floor and the uppermost floor of a base-isolation layer 51 of the extension building 3 to the existing building 2 with a connection beam 72; and step 7 of connecting the rest floors of the extension building 3 to the existing building 3 with the connection beam 72.

SELECTED DRAWING: Figure 7

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a method for adding a base-isolated building extension to an existing base-isolated building.

BACKGROUND ART Conventionally, base-isolated buildings have been expanded (see Patent Documents 1 to 3).
Patent Document 1 shows a method for expanding a seismically isolated building. That is, first, a seismic isolation device is installed on a foundation for a seismic isolation device set adjacent to an existing seismically isolated building. Then, a first building foundation is installed on the seismic isolation device, and a first upper frame is constructed on the first building foundation to construct an expanded seismic isolation building that is independent of the existing seismic isolation building. Then, the building foundation of the existing seismically isolated building and the first building foundation are connected by a second building foundation, a second upper frame is constructed on the second building foundation, and this second upper frame is attached to the existing base. It is integrated into the upper frame of the seismically isolated building and the first upper frame of the expanded base isolated building.

Patent Document 2 discloses an extension method for building in stages a building with a seismic isolation structure that is seismically isolated and supported by a seismic isolation device. First, we will build a preliminary building as a base-isolated building that is seismically isolated and supported by a base-isolation device, and begin its use. After that, an additional building with seismic isolation support is constructed using a seismic isolation device in the additional space secured around the preceding building, and the added building is connected to the preceding building via vibration damping members. The entire building and extension building will be put into service as a new seismically isolated building.
Patent Document 3 discloses a method for expanding a seismic isolation structure. First, the additional structure is constructed by separating it from the existing structure with its seismic isolation device locked. Once the additional structure has the required structure shape, the additional structure is connected to the existing structure. After this connection is completed, the base isolation device of the additional structure is unlocked.

Patent No. 3816183 Japanese Patent Application Publication No. 2008-214969 Japanese Patent Application Publication No. 2000-204772

An object of the present invention is to provide a method for extending a seismically isolated building that can quickly ensure the structural safety of the seismically isolated building even if an earthquake occurs during the construction of the extension.

The method for extending a seismically isolated building according to the first invention is to add an extension part having a seismically isolated structure (for example, an extension building 3 to be described later) to an existing building having a seismically isolated structure (for example, a preceding building 2 to be described later). A method for extending a building, wherein a new seismic isolation device (for example, a new seismic isolation device 50 described below) for the extension is installed adjacent to the existing building and temporarily restrained, and in this state, the newly installed seismic isolation device is installed adjacent to the existing building. The step of constructing a part of the extension part on the device (for example, steps S2 and S3 described later), and releasing the temporary restraint of the newly installed seismic isolation device, and in this state, the existing part of the remaining part of the extension part is removed. The process of constructing parts other than the joint with the building (for example, step S4 described below) and measuring the horizontal distance between the existing building and the extension, and determining that the horizontal distance is within the range of the control standard value of seismic isolation clearance. If the existing building and the extension are located outside, a portion above the base isolation layer of at least one of the existing building and the extension is horizontally moved using a jack (for example, a jack 70 described below), and the existing building and the extension are removed. A step (for example, step S5 described later) of making the horizontal distance between the base isolation clearance and the base isolation clearance within the control standard value, and a step of connecting the floor immediately above the base isolation layer and the top floor of the extension part (for example, a step of joining the existing building (for example, step S6, described below) using a joining beam 72 (described later), an additional floor section, an expansion joint; and a step of joining the remaining floors of the expanded section to the existing building by the joining means. The method is characterized in that it includes a step (for example, step S7 described below).

Here, the management standard value of seismic isolation clearance is a predetermined numerical range that is set in consideration of the magnitude of unexpected seismic motion, construction error, etc. with respect to the set value of seismic isolation clearance.
According to this invention, the floor immediately above the seismic isolation layer and the top floor of the extension part were first joined to the existing building using the joining means. In this way, by connecting the upper and lower ends of the seismic isolation layer of the extension to the existing building in advance, even if an earthquake occurs during construction work, the existing building and the extension can maintain their seismic isolation function as one unit. As a result, the structural safety of seismically isolated buildings can be quickly ensured.
Additionally, during the construction of an extension, due to the occurrence of a large earthquake, the horizontal distance between the existing building and the extension may fall outside the control standard value for seismic isolation clearance.
Therefore, according to the present invention, when the horizontal distance between the existing building and the extension is outside the range of the control standard value for seismic isolation clearance, the seismic isolation layer of at least one of the existing building and the extension is The upper part will be moved horizontally using a jack, and the horizontal distance between the existing building and the extension will be within the control standard value for seismic isolation clearance. In this way, by appropriately correcting the distance between the existing building and the extension and keeping the horizontal distance between the existing building and the extension within the range of the control standard value for seismic isolation clearance, the distance between the existing building and the extension can be improved. It is possible to ensure the seismic isolation performance of integrated seismic isolation buildings.

In the method for extending a seismically isolated building according to a second aspect of the invention, in the step of constructing a part of the extension part other than the joint part with the existing building, in a plan view, the part of the extension part other than the joint part with the existing building is constructed. In the vicinity, the floor structure on the upper floor is supported from the floor structure on the lower floor by temporary supports (for example, temporary supports 80 described below), and among the temporary supports, those placed on the seismic isolation layer are provided with temporary seismic isolation. It is characterized by providing a bearing (for example, a sliding bearing 81, a rolling bearing, a laminated rubber bearing, which will be described later).

According to this invention, the upper floor frame is supported by temporary supports from the lower floor frame in the vicinity of the joint with the existing building in the extension part in plan view, so that the joint of the extension part with the existing building is It is possible to prevent the floor structure of each floor from bending in the section.
In addition, we installed temporary seismic isolation supports on the temporary supports placed on the seismic isolation layer, so even if an earthquake occurs during construction, the extension can be moved horizontally smoothly using the seismic isolation device. This prevents deformation and damage to the extension.

In the method for expanding a seismically isolated building according to a third aspect of the present invention, when horizontally moving a portion above a seismic isolation layer of at least one of the existing building and the expanded portion using a jack, the jack is attached to a predetermined seismic isolation device. It is characterized in that it is arranged and driven between the lower frame of the seismic isolation device and the upper frame of the seismic isolation device adjacent to the predetermined seismic isolation device.

According to this invention, when horizontally moving a portion above the base isolation layer of at least one of an existing building and an extension using a jack, the jack is placed between the lower frame of the predetermined base isolation device and the predetermined base isolation layer. It was placed between the device and the upper structure of the seismic isolation device adjacent to it and was driven. Therefore, an existing building or an extension can be moved horizontally using a jack without constructing a new reaction block to absorb the reaction force of the jack, and construction costs can be reduced.

According to the present invention, it is possible to provide a method for expanding a seismically isolated building that can quickly ensure the structural safety of the seismically isolated building even if an earthquake occurs during the construction work of the expanded portion.

FIG. 1 is a longitudinal cross-sectional view of a seismically isolated building constructed by a method for expanding a seismically isolated building according to an embodiment of the present invention. It is a flowchart of a procedure for constructing a seismically isolated building according to an embodiment. FIG. 2 is an explanatory diagram (part 1, a state in which a preceding building has been constructed) of the construction procedure of a seismically isolated building according to an embodiment. FIG. 2 is an explanatory diagram of the construction procedure of the seismically isolated building according to the embodiment (part 2, a state in which the first floor portion of the expanded building has been constructed); FIG. FIG. 3 is an explanatory diagram of the construction procedure of the seismically isolated building according to the embodiment (part 3, a state in which the parts of the expanded building other than the joint with the preceding building have been constructed); FIG. It is an enlarged view of the boundary part between the expanded building and the preceding building according to the embodiment. FIG. 4 is an explanatory diagram of the construction procedure of the seismically isolated building according to the embodiment (part 4, a state in which the floor immediately above the seismic isolation layer and the top floor of the expanded building are joined to the preceding building). It is a figure showing the installation state of the jack in the case of horizontally moving the upper frame of the seismically isolated building or the newly installed upper frame according to the embodiment.

The present invention is a method for constructing a seismically isolated building in which an extension part with a seismically isolated structure is added to an existing building with a seismically isolated structure. Specifically, the horizontal distance between the existing building and the extension is within the control standard value for seismic isolation clearance, and the floors directly above and top floors of the extension's seismic isolation layer are connected to the existing building in advance. The remaining floors were then joined together to create a seismically isolated building. Additionally, when constructing the extension, each floor of the extension was supported with temporary supports.
Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a seismically isolated building 1 constructed by a method for expanding a seismically isolated building according to an embodiment of the present invention.
The seismic isolation building 1 has a seismic isolation structure, and includes a preceding building 2 as an existing building with a seismic isolation structure, and an extension building 3 as an extension of the seismic isolation structure built adjacent to the preceding building 2. It is a building constructed by joining.

The preceding building 2 includes a lower frame 10, a plurality of seismic isolation devices 20 provided on the lower frame 10, and an upper frame 30 provided on these seismic isolation devices 20.
The seismic isolation device 20 is provided directly under the first floor column (first floor beam) and constitutes a seismic isolation layer 21. The seismic isolation device 20 includes a lower plate (not shown), a rubber layer (not shown) provided on the lower plate, and an upper plate (not shown) provided on the rubber layer.
The lower frame 10 includes a foundation 11, a plurality of underground columns 12 provided on the foundation 11, and a plurality of underground beams 13 that connect the underground columns 12 to each other. The above-mentioned seismic isolation device 20 is installed at the top of the underground column 12 on the first basement floor.
The upper frame 30 includes columns 31 provided on the seismic isolation device 20 and beams 32 that connect the columns 31 to each other.

The expanded building 3 includes a newly installed lower frame 40, a plurality of newly installed seismic isolation devices 50 provided on the newly installed lower structure 40, and a newly installed upper structure 60 provided on these newly installed seismic isolation devices 50. .
The newly installed seismic isolation device 50, like the seismic isolation device 20 of the preceding building 2, is provided directly under the first floor column (first floor beam) and constitutes a seismic isolation layer 51. This newly installed seismic isolation device 50 has the same configuration as the seismic isolation device 20.

The newly installed lower frame 40 includes a foundation 41, a plurality of underground columns 42 provided on the foundation 41, and a plurality of underground beams 43 that connect the underground columns 42 to each other. The newly installed seismic isolation device 50 described above is installed at the top of the underground pillar 42 on the first basement floor.
The newly installed upper frame 60 includes columns 61 provided on the newly installed seismic isolation device 50 and beams 62 that connect the columns 61 to each other.

Hereinafter, the procedure for constructing the seismically isolated building 1 will be explained with reference to the flowchart of FIG. 2. In this seismic isolation building 1, a preceding building 2 is constructed in advance, and while continuing to use this preceding building 2, an extension building 3 is constructed, and this extension building 3 is joined to the preceding building 2.
In step S1, as shown in FIG. 3, the ground 4 is excavated to construct the preceding building 2. This preceding building 2 is used as a building with a seismic isolation structure by operating the seismic isolation device 20. Note that the opening of the preceding building 2 on the extended building 3 side is closed with a temporary outer wall 90 (see FIG. 6).
In step S2, as shown in FIG. 4, the ground 4 adjacent to the preceding building 2 is excavated, and a new lower frame 40 of the extended building 3 is constructed adjacent to the preceding building 2 on this excavated portion.

In step S3, as shown in FIG. 4, a newly installed seismic isolation device 50 is installed on the newly installed lower frame 40 and temporarily restrained. In other words, the laminated rubber of the newly installed seismic isolation device 50 is restrained so as not to be deformed. In this state, the first floor portion (first floor column 61 and first floor beam 62) of the newly installed upper frame 60 of the expanded building 3 is constructed on the newly installed seismic isolation device 50.
At this time, the horizontal distance between the first floor part of the preceding building 2 and the first floor part of the expanded building 3 is set to be the control reference value d for seismic isolation clearance (see FIG. 6).
In addition, in a plan view, the upper floor frame is supported from the lower floor frame by temporary supports 80 in the vicinity of the joint with the preceding building 2 in the first floor part of the newly constructed upper frame 60. For those of the temporary supports 80 disposed on the seismic isolation layer 51, sliding supports 81 are provided as temporary seismic isolation supports that allow relative movement in the horizontal direction between the upper floor floor structure and the lower floor floor structure. In addition, the temporary columns 80 and sliding bearings 81 placed on the seismic isolation layer 51 reduce the seismic load acting on the new upper frame 60 when an earthquake occurs during the construction of the new upper frame 60, and provide seismic isolation. It is a means of ensuring the structural safety of buildings.

In step S4, as shown in FIG. 5, the temporary restraint of the newly installed seismic isolation device 50 is released, and the newly installed seismic isolation device 50 is made to operate. In this state, the parts of the newly constructed upper frame 60 of the extended building 3 other than the joint with the preceding building 2 are constructed.
At this time, as shown in FIG. 6, the horizontal distance between the preceding building 2 and the extended building 3 is set to the set value d of the seismic isolation clearance. The set value d of the seismic isolation clearance is the sum of the set value _d1 of the seismic isolation clearance of the seismic isolation device 20 of the preceding building 2 and the set value _d2 of the seismic isolation clearance of the newly installed seismic isolation device 50 of the expanded building 3. be. For example, the set value d of the seismic isolation clearance is 1200 mm.
In addition, at this time, the opening on the side of the preceding building 2 of the extended building 3 is closed with a curing frame 91 and a soundproof sheet 92. Also, in plan view, in the vicinity of the joint with the preceding building 2 in the newly constructed upper frame 60, , the upper floor frame is supported from the lower floor frame by temporary supports 80.

In step S5, as shown in FIG. 7, the horizontal distance between the upper frame 30 of the preceding building 2 and the newly constructed upper frame 60 of the expanded building 3 is measured, and this horizontal distance is outside the range of the control reference value d of seismic isolation clearance. In this case, at least one of the upper frame 30 and the new upper frame 60 is moved horizontally by the jack 70, and the horizontal distance between the upper frame 30 and the new upper frame 60 is within the control standard value of seismic isolation clearance. Correct to.
Here, the management reference value of the seismic isolation clearance is a predetermined numerical range that is set with respect to the set value d of the seismic isolation clearance, taking into consideration the magnitude of unexpected seismic motion, construction error, etc. For example, the set value d of the seismic isolation clearance is 1200 mm, and the control reference value of the seismic isolation clearance is 1100 mm or more and 1300 mm or less.
Specifically, as shown in FIG. 8, the jack 70 and the reaction girder 71 made of steel are connected to the lower frames 10 and 40 below the predetermined seismic isolation devices 20 and 50, and the predetermined seismic isolation devices 20 and 40, respectively. , 50, and drive the jack 70 to correct the horizontal distance between the upper frame 30 and the newly installed upper frame 60. do.

In step S6, as shown in FIG. 7, the floor directly above the base isolation layer 51 and the top floor of the newly installed upper frame 60 of the extended building 3 are joined to the upper frame 30 of the preceding building 2 using the connecting beam 72 as a connecting means. . This work will be completed in one day at the earliest.
In step S7, the remaining floors of the newly installed upper frame 60 of the extended building 3 are joined to the preceding building 2 by the joining beams 72.

According to this embodiment, there are the following effects.
(1) The floor directly above the seismic isolation layer 51 and the top floor of the extended building 3 were previously joined to the preceding building 2 using the joining beams 72. In this way, by connecting the upper and lower ends of the seismic isolation layer 51 of the extension building 3 to the preceding building 2 in advance, even if an earthquake occurs during the construction work of the extension building 3, the existing building and the extension can be connected. Since the seismic isolation function is exhibited as a whole, the structural safety of the seismic isolation building 1 can be quickly ensured.
In addition, if the horizontal distance between the preceding building 2 and the expanded building 3 is outside the range of the control standard value of seismic isolation clearance, at least one of the upper frame 30 and the new upper frame 60 is moved horizontally by the jack 70, The horizontal distance between the upper frame 30 and the newly installed upper frame 60 is set within the control standard value for seismic isolation clearance. In this way, since the distance between the preceding building 2 and the extended building 3 is appropriately corrected, the seismic isolation performance of the seismic isolation building 1 in which the preceding building 2 and the extended building 3 are integrated can be ensured.

(2) In plan view, in the vicinity of the joint with the preceding building 2 of the extension building 3, the upper floor frame was supported from the lower floor frame by temporary supports 80; It is possible to prevent the floor structure of each floor from bending at the joints with the floor structure.
In addition, since sliding bearings 81 are provided on the temporary supports 80 that are placed on the seismic isolation layer 51, even if an earthquake occurs during construction work, the newly installed seismic isolation device 50 allows smooth horizontal movement of the extended building 3. Therefore, deformation and damage to the extended building 3 can be prevented.

(3) When horizontally moving at least one of the upper frame 30 and the newly installed upper frame 60 using the jack 70, the jack 70 is used to move the lower frame 10, 40 of the predetermined seismic isolation devices 20, 50 and the predetermined seismic isolation devices 20, 50. The seismic isolation devices 20 and 50 were placed between the upper frames 30 and 60 of the seismic isolation devices 20 and 50 and were driven. Therefore, the preceding building 2 and the extended building 3 can be horizontally moved by the jacks 70 without constructing new reaction blocks for taking the reaction force of the jacks 70, and construction costs can be reduced.

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 the above-described embodiment, the preceding building 2 and the newly constructed upper frame 60 of the added building 3 are connected by the connecting beam 72, but the invention is not limited to this, and they may be integrated at an additional floor section, or the preceding building 2 A gap is secured between the building and the newly installed upper frame 60 of the extended building 3, and an expansion joint is provided in this gap to prevent collision between the preceding building 2 and the newly installed upper frame 60 of the expanded building 3 in the event of an earthquake. Good too.
Further, in the above-described embodiment, the sliding bearing 81 is provided as a temporary seismic isolation bearing, but the present invention is not limited to this, and a rolling bearing or a laminated rubber bearing may be used.

1...Seismic isolation building 2...Preceding building (existing building) 3...Additional building (extension part) 4...Ground 10...Lower frame 11...Foundation 12...Underground column 13...Underground beam 20...Seismic isolation device 21...Seismic isolation layer 30 ...Upper frame 31...Column 32...Beam 40...New lower frame 41...Foundation 42...Underground column 43...Underground beam 50...Newly installed seismic isolation device 51...Seismic isolation layer 60...Newly installed upper frame 61...Column 62...Beam 70...Jack 71...Reaction force girder 72...Joining beam (joining means)
80...Temporary support 81...Sliding support (temporary seismic isolation support)
90... Exterior wall 91... Curing frame 92... Soundproof sheet

Claims (3)

An extension method for a seismically isolated building in which an extension part with a seismic isolation structure is added to an existing building with a seismic isolation structure,
Installing a new seismic isolation device for the extension part adjacent to the existing building and temporarily restraining it, and in this state, constructing a part of the extension part on the newly installed seismic isolation device;
releasing the temporary restraint of the newly installed seismic isolation device, and in this state, constructing the remaining part of the extension part other than the joint part with the existing building;
The horizontal distance between the existing building and the extension is measured, and if the horizontal distance is outside the control standard value for seismic isolation clearance, the seismic isolation layer of at least one of the existing building and the extension is measured. horizontally moving the upper part of the building using a jack to bring the horizontal distance between the existing building and the extension part within the control reference value of the seismic isolation clearance;
a step of joining the floor directly above the seismic isolation layer and the top floor of the extension part to the existing building using a joining means;
A method for extending a seismically isolated building, comprising the step of joining the remaining floors of the extension part to the existing building using the joining means. In the step of constructing a portion of the extension other than the joint with the existing building, the floor structure of the upper floor is connected to the floor of the lower floor in the vicinity of the joint with the existing building of the extension in plan view. 2. The method for expanding a seismically isolated building according to claim 1, wherein the building frame is supported by temporary supports, and those of the temporary supports arranged on the seismic isolation layer are provided with temporary seismic isolation bearings. When horizontally moving the portion above the base isolation layer of at least one of the existing building and the extension using a jack, the jack is placed between the lower frame of the predetermined base isolation device and the base isolation layer of the predetermined base isolation device. 3. The method for expanding a seismic isolation building according to claim 1, wherein the seismic isolation device is placed between an upper frame of an adjacent seismic isolation device and driven.

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