JP5984655B2 - Construction method of seismic isolation building - Google Patents

Description

  The present invention relates to a base-isolated building and a construction method thereof.

2. Description of the Related Art Conventionally, seismic isolation buildings that make a building seismic isolation by providing a seismic isolation device on a predetermined floor of the building are known.
On the other hand, in order to shorten the construction period, there is a case where a building is constructed by a reverse driving method. In the reverse driving method, a pile hole is excavated in the ground, a pile is placed in the pile hole, and a structural pillar is built in the pile, and the lower step portion of the structural pillar is integrated with the pile. Then, while excavating the ground, the basement floor is constructed in order downward, and at the same time, the ground floor steel frame is connected to the upper end portion of the structural pillar, and the ground floor is constructed in order upward.

  When constructing the above base-isolated building by the reverse driving method, for example, the following construction methods have been proposed.

The base-isolated building according to the construction method of the first base-isolated building has a structure in which a base-isolating device is provided at the base (see Patent Document 1). That is, a column base is provided above the foundation beam, and a seismic isolation device is provided between the foundation beam and the column base.
This seismic isolated building is constructed by the following procedure. First of all, the structural column is built, and then each layer is built sequentially in the downward direction, and the column base and foundation beam are built. Next, a support work is installed between the foundation beam and the column base, and the load of the building is supported by this support work. Next, a portion between the column base and the foundation beam is excised from the structural column, and a seismic isolation device is attached to the excised portion. And the load of the building is supported by the seismic isolation device by removing the support work.

  The seismic isolation building according to the construction method of the second seismic isolation building has a structure in which a seismic isolation device is provided between the basement floor and the ground floor (see Patent Document 2). Specifically, this base-isolated building is constructed by the following procedure. First, a structural pillar is installed, and a seismic isolation device is installed on the head of the structural pillar. Next, a ground frame supported by the seismic isolation device is constructed on the seismic isolation device, and an underground frame is constructed below the seismic isolation device.

Japanese Patent No. 3648651 Japanese Patent No. 2950325

However, in the construction method of the first seismic isolation building, a support is installed between the foundation beam and the column base, which is the lowest layer in the basement, and a part of the structural pillar is excised, and the seismic isolation device As a lot of work for seismic isolation, such as mounting, was performed, workability deteriorated and it was difficult to ensure construction accuracy.
Moreover, in the construction method of a 2nd seismic isolation building, after providing a seismic isolation apparatus, a ground frame and an underground frame are constructed. For this reason, if the frame column sinks during construction, the height of the seismic isolation device will shift, the beam above the seismic isolation device will tilt, or the support load of the seismic isolation device may change. There was a risk of performance degradation.

The present invention, while preventing the workability is decreased, and an object thereof is to provide a method of constructing MenShinKen product seismic isolation performance can be secured.

  The construction method of the base-isolated building according to claim 1 includes a lower housing (for example, an underground housing 10 described later), and a seismic isolation layer (for example, an upper surface near the ground surface). A seismic isolation layer 20) described below and an upper housing (for example, a ground housing 30 described later) provided on the seismic isolation layer, and the upper housing is used as the lower housing in the seismic isolation layer. When constructing a base-isolated building (for example, a seismic isolation building 1 to be described later) provided with a base isolation device (for example, a seismic isolation device 21 to be described later) that is supported in a state of being relatively movable in the horizontal direction. (For example, a later-described pile 11), and a first step (for example, later-described step S1) for constructing a structural pillar (for example, a later-described structural pillar 41) on the pile, A base-isolated lower floor (for example, the base-isolated lower floor 15 described later), which is a part of the lower housing, is constructed at the capital, A second step of installing the seismic isolation device on the lower floor of the seismic isolation layer (for example, steps S2 and S3 described later), and a support work (for example, a support work 42 described later) on the lower floor of the base isolation layer. And a third step (for example, step S4 to be described later) for constructing a base isolation layer upper floor (for example, a seismic isolation layer upper floor 31 to be described later) that is a part of the upper frame on the support structure, and , A fourth step of constructing the lower housing and the upper housing (for example, steps S5 to S8 described later), and a fifth step of switching the support of the seismic isolation layer upper floor from the support to the seismic isolation device (for example, Step S9) to be described later.

The construction method of the seismic isolation building according to claim 1 is characterized in that, before the fifth step, a jack (for example, a jack 43 described later) is installed on the lower floor of the seismic isolation layer, and the jack is jacked up. The seismic isolation layer upper floor is supported by the jack and the support is cut, and in the fifth step, the jack is jacked down and the seismic isolation layer upper floor is supported by the seismic isolation device. It is characterized by making it.

The base-isolated building of the present invention comprises a lower housing, a base-isolating layer provided on the lower housing and at the height of the ground surface, and an upper housing provided on the base-isolating layer, The base isolation layer is a base isolation building provided with a base isolation device that supports the upper casing in a state of being movable relative to the lower casing in a horizontal direction. A seismic isolation layer lower floor which is constructed at the top of a built-in structural pillar and forms a part of the lower housing; and an seismic isolation layer upper floor which forms a part of the upper housing; and vertical load, are preferably transmitted from the base isolation layer upper bed only through the seismic isolation device to the seismic isolation layer lower floor.

According to the present invention, since the seismic isolation building is constructed by the reverse driving method, the construction period can be shortened.
In addition, since the head of the structural pillar is restrained by the lower floor of the base isolation layer, and the base isolation device is installed on the lower floor of the base isolation layer, the position and horizontality of the base isolation device are stabilized.
Moreover, since the seismic isolation layer upper floor is constructed after installing the seismic isolation device, when the seismic isolation device is installed, there is no obstacle at the top, so the seismic isolation device can be accurately installed.
In addition, a base isolation layer is provided at the height near the ground surface, that is, the uppermost layer in the basement, and many constructions are carried out for isolation in this base isolation layer. Therefore, the construction accuracy can be secured without lowering the workability.
In addition, after the lower and upper frames are almost completed and most of the load is transferred to the foundation structure, causing uneven settlement, the support of the upper floor of the seismic isolation layer is switched from the support to the seismic isolation device. There is no displacement in the height direction of the beam above the seismic device, and seismic isolation performance can be secured.

It is sectional drawing of the base isolation building to which the construction method of the base isolation building which concerns on one Embodiment of this invention was applied. It is a flowchart of the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (1) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (2) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (3) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (4) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (5) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (6) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (7) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (8) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (9) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (10) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment. It is FIG. (The 11) for demonstrating the construction procedure of the seismic isolation building which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a base-isolated building 1 to which a construction method for a base-isolated building according to an embodiment of the present invention is applied.
The base-isolated building 1 includes an underground housing 10 as a lower housing, a seismic isolation layer 20 provided on the underground housing 10 at a height near the ground surface, and a ground housing 30 as an upper housing. .

A mountain retaining wall 40 is provided on the ground 2 around the underground frame 10.
The underground structure 10 includes a plurality of piles 11, a foundation 12 such as a pressure plate or a foundation beam supported by the piles 11, an underground second-floor structure 13 provided on the foundation 12, and the second underground floor And an underground first-floor housing 14 provided on the housing 13.

The seismic isolation layer 20 is provided between the base isolation layer lower floor 15 constituting the underground frame 10 and the base isolation layer upper floor 31 provided on the base isolation layer lower floor 15 and constituting the ground frame 30. Provided.
A plurality of seismic isolation devices 21 are installed on the seismic isolation layer lower floor 15 of the seismic isolation layer 20. The seismic isolation device 21 is, for example, a laminated rubber in which thin rubbers and steel plates are alternately stacked.
A receiving slab 32 is provided between the lower surface of the seismic isolation layer upper floor 31 and the seismic isolation device 21, and the seismic isolation device 21 supports the ground frame 30 via the receiving slab 32. Yes.

The ground frame 30 is constructed at a predetermined distance from the mountain retaining wall 40 around the underground frame 10.
Accordingly, the seismic isolation device 21 supports the ground frame 30 and holds the ground frame 30 in a state in which the ground frame 30 can move relative to the underground frame 10 in the horizontal direction. That is, the vertical load of the ground frame 30 is transmitted from the base isolation layer upper floor 31 to the base isolation layer lower floor 15 only through the base isolation device 21.

Hereinafter, the construction method of the seismic isolation building 1 is demonstrated, referring the flowchart of FIG.
In step S1, a mountain retaining wall 40 is constructed on the ground 2 as shown in FIG. Next, the piles 11 are constructed, and the structural pillar 41 is built in these piles 11.

  In step S2, as shown in FIG. 4, the ground 2 is primarily excavated to expose the stigma of the structural pillar 41.

In step S3, as shown in FIG. 5, the seismic isolation layer lower floor 15 is constructed as a preceding floor on the top of the structural pillar 41. The seismic isolation layer lower floor 15 is supported by the structural pillar 41 and serves as the first step beam of the mountain retaining wall 40.
Furthermore, the seismic isolation device 21 is installed on the seismic isolation lower floor 15.

  In step S <b> 4, as shown in FIG. 6, a steel support 42 is installed near the seismic isolation device 21, and the seismic isolation layer upper floor 31 is constructed on the support 42. Thereby, the seismic isolation layer upper floor 31 is supported not by the seismic isolation device 21 but by the support work 42. Further, a temporary slab is provided around the seismic isolation layer upper floor 31, and the seismic isolation layer upper floor 31 is connected to the mountain retaining wall 40.

  In step S5, as shown in FIG. 7, construction of the ground frame 30 is started on the ground. On the other hand, in the underground, the ground 2 is secondarily excavated to construct the floor portion of the underground first-floor frame 14. The floor portion of the first basement frame 14 serves as a second step beam for the mountain retaining wall 40.

  In step S6, as shown in FIG. 8, the ground frame 30 is continuously constructed, and the ground 2 is excavated tertiary to the floor surface in the basement.

  In step S7, as shown in FIG. 9, the ground frame 30 is continuously constructed, and the foundation 12 and the second-floor frame 13 are constructed underground to complete the underground frame 10.

In step S8, the ground chassis 30 is continuously constructed to complete the ground chassis. Further, in the seismic isolation layer 20, as shown in FIG. 10, a jack 43 is installed inside the support work 42. At this time, the receiving slab 32 positioned immediately above the seismic isolation device 21 shown in FIG. 1 has not been constructed yet.
In addition, a metal touch joint that transmits a vertical axial force but does not transmit a tensile force is used at a central portion (indicated by a broken line in FIG. 10) in the height direction of the support work 42.

Next, as shown in FIG. 11, the jack 43 is jacked up in the direction of the white arrow in FIG. 11, and the seismic isolation upper floor 31 is supported by the jack 43 to support the seismic isolation upper floor 31. Switch from work 42 to jack 43.
Next, as shown in FIG. 12, the support work 42 is cut at the center in the height direction.

At this time, since a metal touch joint is used at the center in the height direction of the support work 42, when the vertical axial force of the support work 42 is released by jacking up, a gap is generated in the joint portion, and the support work 42 The central portion of the can be easily cut or removed.
In addition, in the center part of the support work 42, not only a metal touch joint but any structure may be used as long as it transmits a vertical axial force but does not transmit a tensile force.

In step S9, the jack 43 is adjusted so that the beam directly above the seismic isolation device 21 has a predetermined height, and thereafter, the receiving slab 32 is received on the lower surface of the seismic isolation layer upper floor 31 as shown in FIG. After that, the jack 43 is jacked down in the direction of the white arrow in FIG. 13, and the seismic isolation layer upper floor 31 is supported by the jack 43 via the receiving slab 32 to support the seismic isolation layer upper floor 31. Is switched from the jack 43 to the seismic isolation device 21.
Thereafter, the temporary slab around the jack 43, the support work 42, and the seismic isolation layer upper floor 31 is removed.

According to this embodiment, there are the following effects.
(1) Since the seismic isolation building 1 was constructed by the reverse driving method, the construction period can be shortened.
In addition, since the head of the structural pillar 41 is restrained by the lower floor 15 of the base isolation layer and the base isolation device 21 is installed on the lower floor 15 of the base isolation layer, the position and horizontality of the base isolation device 21 Is stable.
In addition, since the seismic isolation layer upper floor 31 is constructed after the seismic isolation device 21 is installed, when the seismic isolation device 21 is installed, there is no obstacle in the upper portion, so the seismic isolation device 21 can be installed with high accuracy.
In addition, since the seismic isolation layer 20 is provided at the height near the ground surface, that is, the uppermost layer in the basement, and many constructions for seismic isolation are performed in the seismic isolation layer 20, materials are carried in and out and workers are entered and exited. Therefore, construction accuracy can be ensured without lowering the workability.
In addition, after the underground skeleton 10 and the ground skeleton 30 are almost completed and most of the load is transmitted to the foundation structure and the uneven subsidence occurs, the seismic isolation device 21 supports the seismic isolation layer upper floor 31 from the support 42. Therefore, there is no position shift in the height direction of the beam on the seismic isolation device 21, and seismic isolation performance can be ensured.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

1 ... Seismic isolation building 10 ... Underground frame (lower frame)
DESCRIPTION OF SYMBOLS 11 ... Pile 12 ... Foundation 13 ... Basement 2nd floor frame 14 ... Basement 1st floor frame 15 ... Base isolation layer lower floor 20 ... Base isolation layer 21 ... Base isolation device 30 ... Ground frame (upper frame)
31 ... Seismic isolation upper floor 32 ... Receiving slab 40 ... Yamadome wall 41 ... Structure pillar 42 ... Support work 43 ... Jack

Claims (1)

A lower housing, a base isolation layer provided on the lower housing and at a height near the ground surface, and an upper housing provided on the base isolation layer, the base isolation layer, When constructing a seismic isolation building provided with a seismic isolation device that supports the upper casing in a state of being movable relative to the lower casing in a horizontal direction,
A first step of constructing a pile and building a structural pillar on the pile;
A second step of constructing a seismic isolation layer lower floor which is a part of the lower housing at the top of the structural pillar, and installing the seismic isolation device on the seismic isolation layer lower floor;
A third step of installing a supporting work on the lower floor of the base isolation layer and constructing an upper floor of the base isolation layer that is a part of the upper frame on the support base;
While constructing the lower housing and the upper housing , a jack is installed inside the support work, the jack is jacked up, the upper floor of the seismic isolation layer is supported by the jack, and the support work is cut. A fourth step;
The jack is adjusted so that the beam directly above the seismic isolation device has a predetermined height, a receiving slab is constructed between the seismic isolation device and the upper floor of the seismic isolation layer, and then the jack is jacked down. A fifth step of switching the support of the base isolation layer upper floor from the support to the base isolation device by supporting the base isolation layer upper floor with the base isolation device. How to build a seismic building.

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