JP2011184883A - Base-isolating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolating method which enables a newly-built building frame to be constructed directly below an existing building, and which enables base isolation of the existing building. <P>SOLUTION: This base-isolating method achieves the base isolation of the existing building 1 which includes an existing foundation 10 and an existing building frame 20 provided on the existing foundation 10. The base-isolating method includes: a step of constructing an earth retaining wall 30 and a pile as a supporting section with the existing building 1 in between; a step of laying a supporting girder 50 between the earth retaining wall 30 and a composite column-and-pier 32 of a pile through the existing building frame 20, and of making the supporting girder 50 temporarily support the existing building frame 20; a step of demolishing the existing foundation 10 by separating the existing foundation 10 from the existing building frame 20, and of constructing the newly-built building frame directly below the existing building frame 20; a step of removing the supporting girder 50 by making the newly-built building frame temporarily support the existing building frame 20; and a step of installing a base-isolating device between the newly-built building frame and existing building frame 20, and of making the base-isolating device support the existing building frame 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seismic isolation method. Specifically, the present invention relates to a seismic isolation method for isolating an existing building including an existing foundation and an existing frame provided on the existing foundation.

  Conventionally, a method for seismic isolation of an existing building including an existing foundation and an existing frame provided on the existing foundation is known. For example, a method has been proposed in which the existing foundation is dismantled while building a new foundation directly under the existing foundation from the center to the outer periphery, and a seismic isolation device is interposed between the new foundation and the existing enclosure. (See Patent Document 1).

JP-A-11-36608

By the way, there is a demand not only to make an existing building base-isolated, but also to build a new underground structure directly under the existing building in order to make more effective use of the underground space of this existing building.
However, when trying to construct a new underground structure directly under the existing structure, it is necessary to support the entire existing structure during the period from dismantling the existing foundation to constructing a new underground structure. This method cannot support the entire existing chassis.

  An object of the present invention is to provide a seismic isolation method capable of constructing a new housing directly under an existing building and capable of isolating the existing building.

  The seismic isolation method according to claim 1 is a seismic isolation method for isolating an existing building comprising an existing foundation and an existing frame provided on the existing foundation, A step of sandwiching a mountain retaining wall and / or a pile as a support part, a step of passing a bridge beam between the support parts through the existing frame, and temporarily supporting the existing frame on the beam Separating the existing foundation from the existing housing, constructing a new housing directly under the existing housing, and temporarily supporting the existing housing in the new housing, and removing the receiving girder And installing the seismic isolation device between the new housing and the existing housing, and supporting the existing housing on the new housing via the seismic isolation device.

According to this invention, a mountain retaining wall or a pile is constructed around the existing building as a support portion. Next, the existing girder is passed between the support portions so as to pass over the girder, and the existing girder is temporarily supported by this girder. Thereby, the existing frame is supported by the mountain retaining wall via the receiving girder. Next, the existing foundation is separated from the existing chassis and dismantled, and a new chassis is constructed directly under the existing chassis. Next, the existing frame is temporarily supported by the new frame and the receiving girder is removed. Next, a seismic isolation foundation will be constructed between the new and existing chassis and the existing chassis will be supported by the seismic isolation foundation.
In this way, the load of the existing housing is temporarily supported on the support portion using the receiving girder, and the new housing is constructed in this state, so that the new housing can be constructed directly under the existing building. In addition, the existing building is supported by the new building via the seismic isolation device, so the existing building can be seismically isolated.

  According to the present invention, the load of the existing housing is temporarily supported on the support portion using the receiving girder, and the new housing is constructed in this state. Therefore, the new housing can be constructed immediately below the existing building. In addition, the existing building is supported by the new building via the seismic isolation device, so the existing building can be seismically isolated.

It is a flowchart of the seismic isolation method which concerns on one Embodiment of this invention. It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 1). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 2). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 3). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 4). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 5). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 6). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 7). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 8). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 9). It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 10).

FIG. 1 is a flowchart of a seismic isolation method according to an embodiment of the present invention.
Hereinafter, according to the flowchart of FIG. 1, a procedure for constructing a new housing immediately below the existing building 1 and making the existing building 1 seismic isolation will be described.
Here, the existing building 1 includes an existing foundation 10 and an existing housing 20 provided on the existing foundation 10 (see FIG. 2).
The existing foundation 10 includes a pedestal pile 11, a pressure platen 12, a foundation beam 13, and the like. On the other hand, the lowest floor of the existing housing 20, that is, the floor directly above the existing foundation 10, is the first basement, and the first basement portion of the existing housing 20 is the first basement column 21, the first floor beam 22, the first floor 23. And so on.

  First, in step S1, as shown in FIG. 2, a mountain retaining wall 30 and a new pile as a support portion are constructed around the existing building 1.

Specifically, the mountain retaining wall 30 is constructed in the vicinity of the existing building 1 (left side in FIG. 2). This mountain retaining wall 30 is an SMW (Soil Mixing Wall) wall, and a core 31 made of H steel is embedded therein.
In addition, a pile for a newly constructed underground building is constructed in the vicinity of the existing building 1 (right side in FIG. 2). The true pillar 32 is inserted in this pile.
As a result, the mountain retaining wall 30 and the structural pillar 32 are arranged with the existing housing 20 interposed therebetween.

  In step S2, as shown in FIG. 3, a reinforcing beam 40 that reinforces the ceiling beam on the lowermost floor of the existing case 20, that is, the first floor beam 22, is constructed.

In step S3, as shown in FIG. 3, the surroundings of the structural pillars 32 are excavated, the receiving beams 33 for supporting the receiving beams are bridged between the structural pillars 32, and then backfilled. .
Further, a reinforced concrete receiving girder foundation 34 is constructed on the core member 31 of the mountain retaining wall 30.
In addition, a smooth moving roadbed 35 is constructed on the lowermost floor of the existing frame 20, that is, the upper surface of the existing foundation 10. Specifically, the moving roadbed 35 is constructed by holding the projecting portion of the existing housing 20, pouring mortar into the recessed portion, and laying an iron plate or rail on the mortar.

In step S4, as shown in FIGS. 4 and 5, the receiving girder 50 is bridged between the mountain retaining wall 30 and the built-up pillar 32 of the pile through the existing frame 20.
That is, as shown in FIG. 4, the receiving girder 50 is divided into a plurality of members 51 outside the existing building 1, and each member 51 is placed on a cart (not shown) and horizontally moved on the moving roadbed 35. Pull into the housing 20. Subsequently, the drawn member 51 is lifted by a chain block (not shown), and the moving roadbed 35 immediately below the member 51 is removed. By repeating this operation, each member 51 is arranged at a predetermined position. Then, the joint part of each member 51 is tightened and connected with a bolt.
Accordingly, as shown in FIG. 5, one end side of the receiving beam 50 is supported by the receiving beam foundation 34, and the other end side is supported by the receiving beam 33, and the receiving beam 50 is in a state of straddling the existing foundation 10. .

  In the present embodiment, the girder 50 is divided into a plurality of members 51 outside the existing building 1, and each member 51 is separately drawn into the existing housing 20. The receiving girder 50 may be completed outside, and the receiving girder 50 may be drawn into the existing housing 20 at a time. Also in this case, the entire receiving beam 50 is lifted by the chain block, and the moving roadbed 35 directly under the receiving beam 50 is removed.

  In step S5, as shown in FIG. 5, the first floor portion 61, which is a part of the new housing, is constructed in advance, and the temporary slab 62 that abuts against the side surface of the existing housing 20 from the first floor portion 61. Build up.

In step S6, the existing case 20 is temporarily supported by the receiving girder 50 as shown in FIG.
Specifically, a temporary receiving jack 70 is installed between the reinforcing beam 40 and the receiving girder 50, and a preload is introduced while managing the displacement by a displacement meter (not shown) so that the existing frame 20 is supported by the receiving girder 50. .

  In step S <b> 7, as shown in FIG. 7, the existing foundation 10 is separated from the existing housing 20 by cutting the underground first-floor column 21 with the wire saw 71 while managing the displacement with a displacement meter (not shown).

In step S8, as shown in FIG. 8, excavation is performed, and a portion below the cut portion of the wire saw 71 is disassembled.
In step S <b> 9, as shown in FIG. 9, a new housing 60 is constructed immediately below the existing housing 20.

In step S10, the existing housing 20 is temporarily supported by the new housing 60 as shown in FIG.
Specifically, a temporary receiving jack 70 is installed between the new housing 60 and the existing housing 20, and a preload is introduced while managing the displacement by a displacement meter (not shown) so that the existing housing 20 is supported by the new housing 80. .

In step S11, as shown in FIG. 10, the receiving girder 50 is removed.
In step S <b> 12, as shown in FIG. 11, the seismic isolation device 92 is installed between the new housing 60 and the existing housing 20.
Specifically, the seismic isolation lower foundation 90 is constructed on the new chassis 60, the seismic isolation upper foundation 91 is constructed on the existing chassis 20, and the seismic isolation lower foundation 90 and the seismic isolation upper foundation 91 are exempted. A seismic device 92 is installed.
In step S13, as shown in FIG. 11, the existing housing 20 is supported on the new housing 60 via the seismic isolation device 92, and then the temporary receiving jack 70 is removed.

According to this embodiment, there are the following effects.
(1) Since the load of the existing frame 20 is temporarily supported by the retaining wall 30 and the structural pillar 32 using the receiving girder 50, and the new frame 60 is constructed in this state, it is newly installed immediately below the existing building 1. A housing 60 can be constructed. In addition, since the existing housing 20 is supported by the new housing 60 via the seismic isolation device 92, the existing building 1 can be seismically isolated.

  (2) Since the first floor portion 61 that is a part of the newly installed frame is constructed in advance, and the temporary slab 62 that contacts the side surface of the existing housing 20 is constructed from the first floor portion 61, this temporary slab is constructed. The side surface of the existing housing 20 is pressed by 62, and the horizontal displacement of the existing housing 20 can be reliably prevented.

  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.

DESCRIPTION OF SYMBOLS 1 ... Existing building 10 ... Existing foundation 11 ... Pedestal pile 12 ... Pressure-resistant board 13 ... Foundation beam 20 ... Existing frame 21 ... Basement 1st floor pillar 22 ... 1st floor beam 23 ... 1st floor 30 ... Yamato wall 31 ... Core material 32 ... 構真 pillar 33 ... receiving beam 34 ... 受桁 substructure 35 ... moving roadbed 40 ... reinforcing beams 50 ... 受桁 51 ... member 60 ... new skeleton 61 ... 1 floor portion 62 ... temporary slab 70 ... temporary supporting jacks 72 ... Wire saw 90 ... Base isolation base 91 ... Base isolation base 92 ... Base isolation device

Claims (1)

A seismic isolation method for isolating an existing building comprising an existing foundation and an existing housing provided on the existing foundation,
Building a mountain retaining wall and / or a pile as a support part across the existing building;
A step of penetrating a receiving girder between the support parts through the existing frame, and temporarily supporting the existing frame on the receiving beam;
Separating and dismantling the existing foundation from the existing housing, and building a new housing directly under the existing housing;
Temporarily supporting the existing housing in the new housing and removing the receiving beam;
Installing the seismic isolation device between the new housing and the existing housing, and supporting the existing housing on the new housing via the seismic isolation device.

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