JP2016130444A - Construction method for base-isolated structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To curtail overall construction period significantly, in a construction method for a base-isolated structure constructed by a normal construction method, having a seismic isolator interposed between a lower column part of a composite structure comprising an iron column part and a concrete part, and upper column part built above the lower column part.SOLUTION: A construction method for a base-isolated structure includes a first step in which an iron column part 1a of a lower column part 1 is arranged and a seismic isolator 2 is installed above the iron column part 1a, a second step in which an upper column part 3 is arranged above the seismic isolator 2 installed in the first step, and a third step in which concrete is cast after arranging the upper column part 3 and completing the lower column part 1.SELECTED DRAWING: Figure 4

Description

  The present invention provides a seismic isolation device in which a seismic isolation device is interposed between a lower column portion composed of a composite structure of an iron column portion and a concrete portion and an upper column portion disposed above the lower column portion. The present invention relates to a method for constructing a seismic isolation structure in which a seismic structure is constructed by a sequential construction method.

  When building a seismic isolation structure with a seismic isolation device between the lower column and upper column, the lower column is installed to install the lower column. Construction work, seismic isolation device installation work that installs the seismic isolation device above the lower column part installed in the process, and upper part that installs the upper column part above the seismic isolation device installed in the process The column arrangement work is performed in this order (see, for example, Patent Document 1).

  Furthermore, if the lower column part is composed of a composite structure of steel and concrete parts, such as SRC structure (steel reinforced concrete structure) or CFT structure (concrete-filled steel pipe structure), lower column part installation work In addition to the arrangement of the iron pillar portion, concrete placement work for placing concrete in the lower pillar portion (hereinafter referred to as “concrete placement work for the lower pillar portion”) has been carried out. Is completed, seismic isolation device installation work and upper column part installation work will be performed.

JP 2011-052432 A

  In the construction method of the conventional seismic isolation structure described above, the concrete is installed in the lower column to complete the lower column, and then the seismic isolation device is installed. Depending on the construction status, the start of seismic isolation device installation work may be delayed. Therefore, the upper column part installation work that needs to be done after installing the seismic isolation device and the start time of the frame construction on the upper floor than the seismic isolation device starting from this are also delayed, which means that the whole construction period Cause a prolonged period.

  In particular, in an intermediate seismic isolation structure where seismic isolation devices are installed on the intermediate floor, the concrete placement work for the lower pillar section over several floors requires a certain period of time. When the seismic isolation device is installed after the completion of the construction, the construction work on the upper floors will start, and there is a problem that the entire construction period will be very long.

  In view of this situation, the main problem of the present invention is that there is no waiver between the lower column portion configured by the composite structure of the iron column portion and the concrete portion and the upper column portion disposed above the lower column portion. In the construction method of the seismic isolation structure in which the seismic isolation structure in which the seismic device is installed is constructed by the forward construction method, it is to provide a technique capable of realizing a significant reduction in the entire construction period.

A first characteristic configuration of the present invention is that a seismic isolation device is provided between a lower column portion configured by a composite structure of an iron column portion and a concrete portion and an upper column portion disposed above the lower column portion. It is a construction method of a seismic isolation structure in which an installed seismic isolation structure is constructed by a sequential construction method,
A first step of disposing an iron pillar portion of the lower pillar portion and installing a seismic isolation device above the iron pillar portion;
A second step of disposing the upper column portion above the seismic isolation device installed in the first step;
After the upper column portion is disposed, a third step of placing the concrete to complete the lower column portion is provided.

  According to this characteristic configuration, the iron pillar part of the lower pillar part is arranged, and the seismic isolation device is installed above the iron pillar part, so that the lower pillar part is completed by placing concrete. The upper column portion can be arranged in advance without being affected by the concrete placing work, and as a result, the overall construction period can be greatly shortened.

  That is, in the first step, the seismic isolation device is installed above the iron column portion of the lower column portion when the iron column portion of the lower column portion is disposed. Thus, without waiting for the completion of the concrete placing work for the lower column portion, in the second step, the upper column portion is disposed above the seismic isolation device, and the upper floor than the seismic isolation device. Construction of the housing can be started. Moreover, about the concrete construction of a lower pillar part, it can complete after arrange | positioning an upper pillar part in a 3rd process, and can complete a lower pillar part.

The second feature configuration of the present invention is a construction method of the seismic isolation structure having the first feature configuration described above.
In the first step, after arranging the iron pillar part of the lower pillar part, the upper part of the seismic isolation lower foundation is constructed in a state connected to the upper part of the iron pillar part, and the upper part of the seismic isolation lower foundation And installing the seismic isolation device above
In the third step, the lower part of the base isolation base is constructed.

  According to this feature configuration, the upper part having the installation surface of the seismic isolation device is pre-installed among the seismic isolation lower foundations that support the seismic isolation device. In situations where it is difficult to install the lower part of the seismic isolation base at the same time, it is possible to shorten the time required to install the seismic isolation device and contribute to shortening the overall construction period.

The third feature configuration of the present invention is a construction method of the seismic isolation structure having the second feature configuration described above.
In the first step, a slab formwork is installed at a height position for slab construction, and the upper part of the seismic isolation lower foundation is made of concrete above the slab formwork using the slab formwork as a concrete support part. The point is to build.

  According to this feature configuration, the slab formwork for slab construction is utilized for the concrete support part of the seismic isolation lower foundation when the upper part having the installation surface of the seismic isolation device is installed in advance in the seismic isolation lower foundation. Therefore, labor saving of construction can be achieved as compared with the case of separately installing a member for supporting concrete.

  Furthermore, in the construction method of the seismic isolation structure having the third characteristic configuration described above, in the first step, at least a part of the concrete for slab construction is placed in advance above the slab formwork, and the slab type When the frame and the hardened portion of the concrete for slab construction are the concrete support portion, the strength of the concrete support portion can be increased by the hardened portion of the concrete for slab construction, and when the slab formwork is used as a discarded formwork It is particularly effective.

The fourth feature configuration of the present invention is a construction method for a seismic isolation structure having any one of the first to third feature configurations described above.
It is in the point which constructs the floor of the installation floor of the seismic isolation device before the implementation of the second step.

  According to this characteristic configuration, since the floor of the installation floor of the seismic isolation device is constructed before the upper column portion is disposed above the seismic isolation device, the upper column portion can be arranged using the floor. It is possible to carry out the construction work on the upper floor more efficiently than the seismic isolation device.

The figure which shows the state of the building after the lower column part iron pillar part arrangement construction in the construction method of the seismic isolation structure of this embodiment The figure which shows the state of the building after the seismic isolation lower base upper part site construction in the construction method of the seismic isolation structure of this embodiment The figure which shows the state of the building after the seismic isolation apparatus installation construction in the construction method of the seismic isolation structure of this embodiment The figure which shows the state of the building after the upper side pillar arrangement | positioning construction in the construction method of the seismic isolation structure of this embodiment The figure which shows the state of the building after the lower pillar part concrete placement construction in the construction method of the seismic isolation structure of this embodiment The figure which shows the state of the building after the seismic isolation lower foundation lower part site construction in the construction method of the seismic isolation structure of this embodiment The figure which shows the state of the building after the seismic isolation upper foundation construction in the construction method of the seismic isolation structure of this embodiment

Embodiments of the present invention will be described with reference to the drawings.
The building constructed by the construction method of the present embodiment (hereinafter referred to as “the present construction method”), as shown in FIG. 7, is a lower pillar portion 1 composed of a composite structure of a steel pillar portion 1 a and a concrete portion 1 b. And an upper base 3 disposed above the lower column 1 is configured as a seismic isolation structure in which a seismic isolation device 2 is interposed. It will be constructed by the order construction method.

The seismic isolation device 2 includes an isolator 2c such as a laminated rubber bearing in which a damper (not shown) such as a steel material or a lead plug is installed, and a lower flange 2a and an upper flange 2b positioned above and below the isolator 2c. Yes. The seismic isolation device 2 is connected to the lower column portion 1 in a state where the lower flange 2a is fixed to the upper end portion side of the lower column portion 1 and the upper flange 2b is fixed to the lower end portion side of the upper column portion 3. It is interposed between the upper column part 3. And by this seismic isolation apparatus 2, at the time of an earthquake, while making the vibration period of a building longer, vibration energy can be attenuated.
In addition, this building is configured as an intermediate seismic isolation structure in which the installation floor of the seismic isolation device 2 (hereinafter referred to as “the seismic isolation device installation floor”) is provided on the intermediate floor.

The specific procedure of this construction method is configured to realize a significant shortening of the entire construction period, and the specific procedure will be described below.
In this construction method, the details of each construction will be described later, but the lower pillar part steel pillar part installation work (see Fig. 1), the seismic isolation lower base upper part construction work (see Fig. 2), the seismic isolation device installation work (Refer to Fig. 3), upper pillar arrangement work (see Figure 4), lower pillar concrete placement work (see Figure 5), seismic isolation lower foundation lower part construction work (see Figure 6), and exemption It is configured to perform each construction of the seismic upper foundation construction (see Fig. 7) in the order described. The process from the lower column part installation work to the seismic isolation device installation process corresponds to the first process, the upper column installation process corresponds to the second process, and the lower column part concrete placement The process after the installation work corresponds to the third process.

(Lower pillar part installation work)
As shown in FIG. 1, in the lower column part iron column part arrangement work of this construction method, the iron column part 1 a of the lower column part 1 is arranged.
That is, in this construction, among the iron pillar part 1a and the concrete part 1b (see FIG. 5) constituting the lower pillar part 1, only the iron pillar part 1a is placed on a plurality of floors including the seismic isolation device installation floor and lower floors. It is built over. In the present embodiment, a relatively high yield strength and high rigidity cross H-shaped steel having a cross-sectional shape obtained by crossing an H-shaped steel is used as the iron pillar portion 1a. However, another shape steel is used. It doesn't matter.

  A steel beam 15 supporting each floor of the lower floor is joined to the steel pillar portion 1a of the lower column portion 1, and a slab construction height position on the upper surface of the steel beam 15 is composed of a deck plate or the like. A slab formwork 16 is installed. Further, the iron pillar portion 1a of the lower pillar portion 1 protrudes upward from the slab formwork 16 on the seismic isolation device installation floor, and a fixing material 12 such as a headed stud or a bolt is provided at an upper end portion thereof. .

(Seismic isolation lower base upper part construction work)
As shown in FIG. 2, in the seismic isolation lower base upper part construction work of the present construction method following the lower pillar part pillar construction work, the upper part 5 a of the seismic isolation lower foundation 5 is constructed.
That is, the seismic isolation lower base 5 for supporting the lower flange 2 a side of the seismic isolation device 2 includes an upper part 5 a above the slab mold 16 and a lower part 5 b below the slab mold 16. In this construction, only the upper part 5a among these parts is constructed.

  In this construction, a region having a predetermined height above the slab form 16, specifically, from the slab form 16 to the base plate 8 on which the seismic isolation device 2 (see FIG. 3) to be installed later is placed. In the area, the upper part 5a of the seismic isolation lower foundation 5 is constructed by placing concrete after appropriately arranging reinforcing bars and formwork (not shown) around the iron pillar portion 1a.

  In the construction procedure of the upper part 5 a of the seismic isolation lower foundation 5, a reinforcing bar and a side mold (not shown) are appropriately disposed above the slab mold 16, and concrete for slab construction is disposed above the slab mold 16. The concrete is placed in two stages in a form in which the slab formwork 16 and the base portion 5aa, which is a hardened portion of the concrete for slab construction, are used as the concrete support portion. That is, in the first-stage concrete placement, the slab form 16 is used as a concrete support portion, and concrete is placed thereabove, and then the floor 17 is constructed by placing concrete later (see FIG. 3). The base portion 5aa having the same height as that is constructed. In the subsequent second stage of concrete placement, when the concrete placed on the base portion 5aa is hardened, the slab form 16 and the base portion 5aa constructed thereon are used as a concrete support portion, The remaining portion 5ab is constructed above the base portion 5aa by placing concrete on the base portion 5aa. The structure in which the base portion 5aa and the remaining portion 5ab are integrated becomes the upper portion 5a of the seismic isolation lower base 5.

  Thus, the concrete of the remaining part 5ab with comparatively large weight can be supported by the base part 5aa constructed | assembled previously by performing concrete placement in the upper part 5a of the seismic isolation lower base 5 in two steps. Therefore, reinforcement for using the slab formwork 16 as a concrete support portion can be omitted or simplified. In this embodiment, the concrete placement of the base portion 5aa is configured to be performed prior to the concrete placement of the floor 17 (see FIG. 3) of the seismic isolation device installation floor. You may perform concrete placement at the same time.

  On the upper end surface of the seismic isolation lower foundation 5 (upper end surface of the remaining portion 5ab), a nut 10a for fixing the seismic isolation device is erected in a posture protruding above the upper end surface of the seismic isolation lower foundation 5 by a predetermined height. Has been. Furthermore, a base plate 8 for placing the seismic isolation device 2 (see FIG. 3) later is installed above the base plate 8. Then, after adjusting the level and height of the base plate 8, the space between the upper end surface of the base isolation base 5 and the base plate 8 is filled with the non-shrink mortar 7, and the base plate 8 is installed. Complete.

(Seismic isolation device installation work)
As shown in FIG. 3, the seismic isolation device 2 is installed above the iron pillar portion 1 a of the lower column portion 1 in the seismic isolation device installation work of the present construction method following the seismic isolation lower base upper part construction work.
That is, in this seismic isolation device installation work, first, on the upper end surface (specifically, the upper surface of the base plate 8) of the upper part 5a of the seismic isolation lower foundation 5 constructed above the iron column part 1a of the lower column part 1. The seismic isolation device 2 is placed on a certain seismic isolation device installation surface. Next, the bolt 10b inserted from above into a bolt insertion hole (not shown) formed in the lower flange 2a of the seismic isolation device 2 is fastened to the nut 10a on the seismic isolation lower foundation 5 side, so that the seismic isolation is achieved. The lower flange 2 a of the device 2 is fixed to the upper end surface of the seismic isolation lower foundation 5.

  Simultaneously with this construction, concrete placement work for the floor 17 on the seismic isolation device installation floor is performed. In addition, at the stage where the lower pillar part installation work is completed and the iron pillar part 1a of the lower pillar part 1 is built, the seismic isolation equipment installation work and Other construction may be performed at the same time.

(Upper column arrangement work)
As shown in FIG. 4, the upper column portion 3 is disposed above the seismic isolation device 2 in the upper column portion arrangement work of the present construction method following the seismic isolation device installation work.
The upper column portion 3 is built as an upper floor above the floor where the seismic isolation device is installed, and is configured as an S structure (steel structure) column section made of H-shaped steel 3a. In this construction, first, the upper column portion 3 is placed on the upper surface of the upper flange 2 b of the seismic isolation device 2. Next, a bolt 11b inserted from below into a bolt insertion hole (not shown) formed in the upper flange 2b of the seismic isolation device 2 was joined to the lower end surface of the H-shaped steel 3a constituting the upper column portion 3. By fastening to the nut 11 a joined to the joining plate, the upper flange 2 b of the seismic isolation device 2 is fixed to the lower end surface of the upper column part 3.

  The seismic isolation device 2 does not wait for completion of the lower column concrete placing work (see FIG. 5), which will be described later, when the upper column part 3 is arranged and the upper column part 3 is arranged. In addition, on the upper floor, it is possible to start the frame work such as the joining of the steel beam 20 to the upper column part 3 and the construction of the slab form 21 on the steel beam 20. That is, the upper column part 3 that is the starting point of the upper-level frame construction is preceded without being affected by the lower column part concrete placing work, and as a result, the overall construction period is significantly shortened. Will be.

(Lower column concrete placement work)
As shown in FIG. 5, in the lower column part concrete placement work following the above upper column part installation work, the concrete of the lower column part 1 is placed and the lower column part 1 is completed. Is done.
That is, in this construction, by placing concrete and reinforcing frames (not shown) around the iron pillar portion 1a previously arranged in the lower pillar portion iron pillar portion arrangement construction, by placing concrete, The lower column part 1 of an SRC structure (an example of a composite structure) including an iron column part 1a made of a shape steel and a concrete part 1b built around the iron column part 1a is constructed.

(Seismically isolated lower foundation lower part construction work)
As shown in FIG. 6, in the seismic isolation lower foundation lower part construction work of this construction method following the lower column concrete placing work, the lower part 5b of the seismic isolation lower foundation 5 is constructed.
That is, in this construction, in the region of a predetermined height below the slab mold 16, specifically, in the region from the upper end of the concrete portion of the lower column part 1 to the slab mold 16, The lower part 5b of the seismic isolation lower foundation 5 is constructed by placing concrete after appropriately arranging reinforcing bars and formwork (not shown). And this lower part 5b and the upper part 5a constructed | assembled before installation of the seismic isolation apparatus 2 are united, and it functions as the seismic isolation lower base 5 for supporting the lower flange 2a side of the seismic isolation apparatus 2. It will be.

(Seismic isolation upper foundation construction)
As shown in FIG. 7, in the seismic isolation upper foundation construction of this construction method following the base isolation lower foundation lower part construction, the seismic isolation upper foundation 6 for the upper flange 2 b side of the seismic isolation device 2 is constructed. .
That is, in this construction, a slab type of a predetermined height region above the upper flange 2b of the seismic isolation device 2, more specifically, a slab type one floor above the seismic isolation device installation floor from the upper flange 2b of the seismic isolation device 2. The upper flange of the seismic isolation device 2 is placed in the region up to the frame 21 by placing concrete after appropriately arranging reinforcing bars and a mold (not shown) around the upper column 3 (H-shaped steel 3a). The seismic isolation upper foundation 6 for supporting the 2b side is constructed.

  In this embodiment, when the seismic isolation upper foundation construction is completed, the concrete is placed on the floor 22 on the upper floor of the seismic isolation device installation floor. You can do it before construction or at the same time.

[Another embodiment]
(1) In the above embodiment, the seismic isolation lower foundation 5 is configured with the upper part 5 a constructed before the installation of the seismic isolation device 2 and the lower part 5 b constructed after the installation of the seismic isolation device 2. Instead of constructing the parts separately in this way, the entire seismic isolation lower foundation 5 may be constructed before the seismic isolation device 2 is installed.

(2) In the above embodiment, the upper end surface of the upper part 5a of the seismic isolation lower base 5 is the seismic isolation device installation surface, but the upper end surface of the iron column portion 1a of the lower column part 1 is also the seismic isolation device installation surface. I do not care. In this case, the seismic isolation device installation work can be carried out at the stage where the lower column steel pillar part installation work has been completed, and the construction of the lower base of the seismic isolation device should be performed after the seismic isolation device installation work as necessary As a result, the overall construction can be further shortened.

(3) In the above embodiment, when the upper part 5a of the seismic isolation lower foundation 5 is constructed, the base portion 5aa is constructed by placing concrete for slab construction in advance above the slab form 16, and the slab form In addition to 16, the hardened base portion 5aa is used as a concrete support portion, and the concrete is placed in two stages. However, within the range in which concrete can be supported, the upper side of the seismic isolation lower foundation 5 The part 5a may be constructed by single-stage concrete placement.

(4) In the above embodiment, the concrete placement work is performed on the floor 17 of the seismic isolation device installation floor simultaneously with the seismic isolation device installation work. The concrete placement work on the floor 17 of the seismic isolation device installation floor may be performed at another time, such as at the same time as the part construction work or at the same time as the upper pillar arrangement work after the seismic isolation equipment installation work.

(5) In the above embodiment, the slab formwork 16 on the seismic isolation device installation floor is used as the concrete support part of the seismic isolation lower foundation 5, but other parts such as another part and removable formwork are exempted. You may use as a concrete support part of the seismic base 5.

(6) In the above embodiment, the seismic isolation lower foundation lower part construction work was performed after the lower column part concrete placing work, but these works may be performed simultaneously.

(7) In this embodiment, the lower column portion 1 is an SRC structure including a steel column portion 1a made of a shape steel and a concrete portion 1b formed by placing concrete reinforcing bars around the steel column portion 1a. However, it may be a CFT structure (concrete-filled steel pipe structure) comprising a steel pillar portion made of a steel pipe and a concrete portion formed by placing a reinforcing bar in the interior and placing concrete.

(8) In the present embodiment, the upper column portion 3 is S structure (steel structure), but any structure such as RC structure (reinforced concrete structure), SRC structure, CFT structure, etc. may be adopted.

(9) In this embodiment, the laminated rubber bearing type seismic isolation device 2 is employed, but other types of seismic isolation devices such as a sliding bearing type, a rolling bearing type, or a combination of these are employed. It doesn't matter.

1: Lower column part 1a: Iron column part 1b: Concrete part 2: Seismic isolation device 3: Upper column part 5: Seismic isolation lower foundation 5a: Upper part 5b: Lower part 16: Slab formwork 17: Seismic isolation device Installation floor 21: Slab formwork

Claims (4)

A seismic isolation structure in which a seismic isolation device is interposed between a lower column portion composed of a composite structure of a steel column portion and a concrete portion and an upper column portion disposed above the lower column portion. It is a construction method of a seismic isolation structure built by the order construction method,
A first step of disposing an iron pillar portion of the lower pillar portion and installing a seismic isolation device above the iron pillar portion;
A second step of disposing the upper column portion above the seismic isolation device installed in the first step;
A method of constructing a base-isolated structure comprising a third step of placing the upper column portion and then placing concrete to complete the lower column portion. In the first step, after arranging the iron pillar part of the lower pillar part, the upper part of the seismic isolation lower foundation is constructed in a state connected to the upper part of the iron pillar part, and the upper part of the seismic isolation lower foundation And installing the seismic isolation device above
The construction method of the seismic isolation structure according to claim 1, wherein, in the third step, a lower part of the base isolation base is constructed.   In the first step, a slab formwork is installed at a height position for slab construction, and the upper part of the seismic isolation lower foundation is made of concrete above the slab formwork using the slab formwork as a concrete support part. The construction method of the seismic isolation structure of Claim 2 to construct | assemble.   The construction method of the seismic isolation structure of any one of Claims 1-3 which construct | assembles the floor of the installation floor of the said seismic isolation apparatus before implementation of the said 2nd process.

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