JP6438202B2 - Construction method of projecting part of seismic isolation building - Google Patents

Description

  The present invention relates to a method for constructing a protruding portion of a seismic isolation building constructed by installing a seismic isolation device on a foundation.

  Seismic isolation buildings that are constructed by installing seismic isolation devices on the foundation have become widespread as countermeasures against large earthquakes, and there are various devices used for such seismic isolation and sliding bearings that can absorb seismic motion (for example, patents) Reference 1).

JP 2011-214583 A

  In the construction of seismic isolation buildings, for example, if the second floor or more is a cantilever projecting part, using a temporary construction base and seismic isolation device to support the projecting part will increase the cost of the temporary construction and increase the cost. Resulting in.

  The subject of this invention is that it can construct the protrusion part of a seismic isolation building by the minimum necessary temporary construction, and can also suppress cost.

In order to solve the above problems, the invention described in claim 1
It is a construction method for the projecting part of a seismic isolation building constructed by installing a seismic isolation device on the foundation,
On the foundation, a main column that supports the tip of the floor beam of the protruding portion, and one end portion is placed on the end of the floor beam on the floor below the protruding portion, and the tip is rigidly joined to the main column. a beam member that is, a post for supporting an intermediate portion of the floor beams of the protruding portion is disposed on the beam members, as well as temporary the支保Engineering comprise absorbable slip bearing ground motion to the shoring The above-described protruding portion is constructed from the floor beam of the protruding portion in a state where the is installed.

The invention described in claim 2
It is a construction method of the protruding part of the seismic isolation building according to claim 1,
The main pillar of the support work is temporarily installed on the sliding bearing installed on the foundation.

The invention according to claim 3
It is a construction method of the protruding part of the seismic isolation building according to claim 1 or 2,
The projecting part is constructed by placing concrete on the floor beam of the projecting part or building a steel frame.

The invention according to claim 4
It is the construction method of the protruding part of the seismic isolation building according to any one of claims 1 to 3,
After the construction of at least one layer of the protruding portion, the support work and the sliding bearing are removed.

  According to the present invention, the protruding portion of the seismic isolation building can be constructed with the minimum necessary temporary work, and the cost can be reduced.

It is the side view which showed the structure of one Embodiment of the construction of the protrusion part of the seismic isolation building to which this invention is applied, and showed the time of 1st-rise concrete placement in the support installation state of the protrusion part. Similarly, it is the figure which showed the time of an earthquake occurrence at the time of the second-floor standing concrete placement with the support installation state of the protruding part. It is the figure which showed the time of the 3rd floor rise concrete placement after the support construction removal.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 shows the time of placing the first floor standing concrete in the installed state of the support 30 of the projecting portion 20 as a configuration of an embodiment of the construction of the projecting portion 20 of the base-isolated building 10 to which the present invention is applied. 1 is a pile, 2 is a foundation, 3 is a support work under the floor, 4 is a formwork for each floor, 5 is a support work for each floor, 11 is a first floor beam, 40 is a seismic isolation device, and 50 is a sliding bearing.

As shown in the figure, on the foundation 2 constructed on the pile 1, the support beam 3 and the seismic isolation device 40 are installed by the support column, and the first floor beam 11 of the seismic isolation building 10 is supported. On the first-floor floor beam 11, the first-floor rising part and the second-floor floor formwork 4 are supported and set by a support 5 by a support column.
Here, the seismic isolation building 10 includes a protruding portion 20 from the second floor, and a supporting work 30 and a sliding bearing 50 that support the mold 4 of the protruding portion 20 are installed.

  In the illustrated example, the support 30 of the protruding portion 20 includes a lower main pillar 31 installed at the tip position of the protruding portion 20 on the foundation 2 and a beam member 32 on which one end is placed on the end of the first floor beam 11. An upper main column 33 that is installed on the tip of the beam member 32 and supports the mold 4 at the tip of the protruding portion 20, and a column 34 that is installed on the beam 32 and supports the mold 4 It consists of and.

That is, the upper main pillar 33 is located immediately above the lower main pillar 31.
Then, the sliding bearing 50 is sandwiched between the upper surface of the foundation 4 and the lower end of the lower main column 31.
Further, the upper end of the lower main column 31, the beam member 32, and the lower end of the upper main column 33 are rigidly joined.
In addition, one end of the beam member 32 is bolted onto the end of the first floor beam 11, and the mold 4 is bolted to the upper end of the upper main column 31.

In the above, as the seismic isolation device 40, the thing made from a hard rubber is used, for example.
As the sliding bearing 50, for example, a sliding plate made of tetrafluoroethylene resin (PTFE: polytetrafluoroethylene) and a stainless steel plate are used. Then, one of the sliding plate and the stainless plate is fixed to the upper surface of the foundation 2 and the other is fixed to the lower end surface of the lower main column 31 of the support work 30.

  Note that a jack (not shown) is used to install the support 3 and the support 30, but the position of the jack may be anywhere on the foundation 2 or the intermediate part or the upper end of the support 3 or the support 30.

  FIG. 2 shows the state when the concrete is set up on the second floor with the support 30 of the protruding portion 20 installed, and shows the time of the occurrence of the earthquake. 12 is the second floor beam, 22 is the second floor of the protruding portion 20. It is a floor beam.

  That is, after placing and curing the first floor rising concrete, the support 3 of the first floor beam 11 and the formwork 4 of the first floor rising portion are removed, and the second floor beam 12 and On the second floor floor beam 22 of the protruding portion 20, the formwork 4 of the second floor rising portion and the third floor portion is supported and set by a support 5 using a support column.

In the illustrated example, the seismic isolation device 40 under the seismic isolation building 10 is elastically deformed in the horizontal direction at the time of the occurrence of the earthquake, and at the same time, the support 30 of the protruding portion 20 is caused by the sliding support 50 to slide. Synchronously with the horizontal reciprocating movement.
Therefore, an effective seismic isolation function can be provided when an earthquake occurs during the construction of the seismic isolation building 10.

  FIG. 3 shows a case where the third-floor standing concrete is placed after the support 30 of the protruding portion 20 is removed. 13 is a third-floor floor beam, and 23 is a third-floor floor beam of the protruding portion 20.

  That is, after placing and curing the second-floor rising concrete, the support 5 of the second-floor floor 11, the mold 4 of the second-floor rising portion, the support 30 and the sliding bearing 50 of the protruding portion 20 are removed. As shown in the figure, on the 3rd floor floor beam 13 of the 3rd floor floor beam 13 and the projecting portion 20, the formwork 4 of the 3rd floor rising portion and the 4th floor floor portion is supported and set by a support 5 using a support column. Is done.

And the third floor rises concrete.
Although not shown, the fourth floor and above are constructed in the same manner.

  As described above, according to the construction of the protruding portion 20 of the seismic isolation building 10 according to the embodiment, the support 30 that supports the floor beam 22 of the protruding portion 20 is temporarily installed on the sliding bearing 50 installed on the foundation 2. Thus, by setting up the second floor standing concrete on the floor beam 22 and constructing the projecting part 20, the projecting part 20 of the seismic isolation building 10 can be constructed with the minimum necessary temporary work and the cost can be reduced. Can do.

(Modification)
In addition to the embodiments described above, it is needless to say that the structure of the building, the seismic isolation device, the support work, and the sliding bearing, and the specific detailed structure can be appropriately changed.
For example, an SRC (steel reinforced concrete) structure, a CFT (concrete filled steel pipe) structure, or an S (steel frame) structure may be used. Part.

DESCRIPTION OF SYMBOLS 1 Pile 2 Foundation 3 Underfloor support 4 Form on each floor 5 Support on each floor 10 Base-isolated building 11 First-floor floor beam 12 Second-floor floor beam 13 Third-floor floor beam 20 Projection part 22 Second-floor floor beam 23 Third floor Floor beam 30 Supporting part of protruding part 31 Lower main pillar 32 Beam material 33 Upper main pillar 34 Post 40 Seismic isolation device 50 Sliding bearing

Claims (4)

It is a construction method for the projecting part of a seismic isolation building constructed by installing a seismic isolation device on the foundation,
On the foundation, a main column that supports the tip of the floor beam of the protruding portion, and one end portion is placed on the end of the floor beam on the floor below the protruding portion, and the tip is rigidly joined to the main column. a beam member that is, a post for supporting an intermediate portion of the floor beams of the protruding portion is disposed on the beam members, as well as temporary the支保Engineering comprise absorbable slip bearing ground motion to the shoring A construction method for a projecting part of a base-isolated building, wherein the projecting part is constructed from the floor beam of the projecting part in a state where the base is installed. The construction method of the projecting part of the seismic isolation building according to claim 1, wherein the main pillar of the support work is temporarily installed on the sliding bearing installed on the foundation. The construction method of the projecting part of the seismic isolation building according to claim 1, wherein concrete is placed on the floor beam of the projecting part or the steel part is built to construct the projecting part.   The construction method of the projecting part of the seismic isolation building according to any one of claims 1 to 3, wherein after the construction of at least one layer of the projecting part, the support and the sliding bearing are removed.

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