JP5316887B2 - Construction method of seismic isolation building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a base-isolated building, which enables an efficient construction of the base-isolated building. <P>SOLUTION: Mat portions 3 and 4 of a seismic isolation foundation 1 include mat units 5 and 6 which are prefabricated by integrally combining at least a reinforcement and a form together, and concrete 9 and concrete 10, which are poured so as to embed the mat units 5 and 6 therein. The seismic isolation foundation 1 is constructed through the following steps: a lower mat unit installation step of installing the lower mat unit 6 of the lower mat portion 3 in a predetermined position; a base-isolating device installation step of installing the base-isolating device 2 on the lower mat unit 6; an upper mat unit installation step of installing the upper mat unit 5 of the upper mat portion 4 in a predetermined position on the base-isolating device 2; and a concrete pouring step of simultaneously pouring the concrete 9 and the concrete 10 in the upper and lower mat portions 4 and 3 or pouring the concrete 9 and the concrete 10 into the upper and lower mat portions 4 and 3 in this order, respectively. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for constructing a base-isolated building, and more particularly to a method for constructing a base-isolated building that is constructed using a prefabricated method.

  For example, when constructing a large-scale facility (building) such as a nuclear power plant, it is prefabricated by combining the reinforcing bars and steel frames of the foundation mat part in advance, and this large block mat unit is used as a crane. A method of constructing a mat portion of a foundation by placing it at a predetermined position by suspending it with a concrete and placing concrete is used (for example, see Patent Document 1). By adopting such a prefabricated construction method, it becomes possible to improve the working environment and work efficiency, thereby shortening the construction period and reducing the construction cost.

  On the other hand, when building this type of building foundation as a base isolation base (when building a base isolation building), conventionally, the lower mat unit is installed and the lower mat unit is constructed by placing concrete. After that, install a seismic isolation device such as laminated rubber on the lower mat, and install an upper mat unit on the seismic isolation device and build concrete by placing concrete. I have to. That is, the upper and lower mat portions are constructed for each step with the seismic isolation device (the seismic isolation layer) interposed therebetween.

Japanese Patent Laid-Open No. 8-313674

  However, when building a base isolation building by installing the mat portions in the upper and lower layers with the base isolation layer sandwiched as described above, the work efficiency is reduced and the construction period is prolonged. For this reason, a method for constructing a seismic isolation building more efficiently has been strongly desired.

  An object of this invention is to provide the construction method of the seismic isolation building which makes it possible to construct a base isolation building more efficiently in view of the said situation.

  In order to achieve the above object, the present invention provides the following means.

  The construction method of the seismic isolation building according to the present invention is a method of constructing a seismic isolation building provided with a seismic isolation foundation having upper and lower mat portions sandwiching a seismic isolation device, wherein the mat portion includes at least reinforcing bars. A lower part in which a lower mat unit of a lower mat part is installed at a predetermined position, including a mat unit that is prefabricated by integrally combining formwork and concrete that is placed so as to bury the mat unit. Mat unit installation step, seismic isolation device installation step for installing the seismic isolation device on the lower mat unit, and upper mat unit installation for installing the upper mat unit of the upper mat portion at a predetermined position on the seismic isolation device Concrete, and placing concrete on the upper mat portion and the lower mat portion simultaneously or in the order of the upper mat portion and the lower mat portion. Characterized in that it comprises a chromatography preparative hitting set step.

  In the construction method of the seismic isolation building of the present invention, at least a reinforcing bar and a formwork are combined in advance and prefabricated to produce a mat unit of a mat part, and concrete is simultaneously applied to an upper mat part and a lower mat part, or By placing the upper mat part and the lower mat part in this order, it is possible to construct a seismic isolation base with the mat part on the top and bottom across the seismic isolation device, greatly increasing the period of reinforcement placement and concrete placement. It can be shortened.

  Therefore, compared with the conventional method of building a base isolation building, the base isolation building can be constructed more efficiently, and the construction period can be shortened and the construction cost can be reduced.

It is a figure which shows the base isolation building (base isolation base) which concerns on one Embodiment of this invention. It is a figure which shows the state which has installed the mat unit of the lower mat part in the construction method of the seismic isolation building which concerns on one Embodiment of this invention. It is a figure which shows the state which installed the several mat unit of the lower mat part in the construction method of the seismic isolation building which concerns on one Embodiment of this invention. It is a figure which shows the state which installed the seismic isolation apparatus in the construction method of the seismic isolation building which concerns on one Embodiment of this invention. In the construction method of the seismic isolation building which concerns on one Embodiment of this invention, it is a figure which shows the state which has installed the mat unit of the upper mat part. It is a figure which shows the state which installed the several mat unit of the upper mat part in the construction method of the seismic isolation building which concerns on one Embodiment of this invention. In the construction method of the base isolation building which concerns on one Embodiment of this invention, it is a figure which shows the state which poured concrete and constructed the upper and lower mat parts.

  Hereinafter, with reference to FIGS. 1-7, the construction method of the seismic isolation building which concerns on one Embodiment of this invention is demonstrated. Here, the present embodiment relates to a method for constructing a base isolation base for a building (base isolation building) such as a nuclear power plant using a prefabrication method.

  As shown in FIG. 1, the base of the base isolation building (base isolation base) 1 of the present embodiment is provided with mat portions 3 and 4 on both sides of a base isolation device (base isolation layer) 2 such as laminated rubber. It is configured. Each of the upper and lower mat portions 3 and 4 includes a plurality of large block mat units 5 and 6 prefabricated in advance by combining reinforcing bars and steel frames in advance, and these mat units 5 and 6 are integrated. The mat modules 7 and 8 are embedded with concrete 9 and 10.

  And in the construction method of the seismic isolation building of this embodiment, the mat units 5 and 6 prefabricated in the yard etc. of the construction site vicinity are produced first, for example. At this time, each mat unit 5 and 6 is manufactured by previously combining the molds 11 and 12 together with the reinforcing bars and the steel frames. Further, in the present embodiment, the mat unit (upper mat unit) 5 of the upper mat portion 4 projects the steel column 5a disposed at a predetermined position downward, and the seismic isolation device 2 is provided at the lower end of the steel column 5a. It is manufactured by providing a mounting portion 5b for connecting the two. On the other hand, the mat unit (lower mat unit) 6 of the lower mat portion 3 projects the steel column 6a disposed at a predetermined position upward, and places the seismic isolation device 2 on the upper end of the steel column 6a. An attachment portion (mounting table) 6b for connection is provided.

  Next, as shown in FIGS. 2 and 3, the lower mat unit 6 of the lower mat portion 3 is installed at a predetermined position by, for example, hanging with a crane, and a plurality of lower mat units 6 are arranged side by side and integrally. The lower mat module 8 of the lower mat part 3 is formed by connecting (lower mat unit installation step).

  Next, as shown in FIG. 4, the seismic isolation device 2 is mounted and mounted on the attachment portion 6b of the steel column 6a of the lower mat unit 6 (seismic isolation device installation step).

  Next, as shown in FIGS. 5 and 6, the upper mat unit 5 of the upper mat portion 4 is installed at a predetermined position by hanging it with a crane, etc., and a plurality of upper mat units 5 are juxtaposed and integrated. The upper mat module 7 of the upper mat part 4 is formed by connecting (upper mat unit installation step). At this time, the mounting portion 5b of the steel column 5a of the upper mat unit 5 is disposed on the seismic isolation device 2 installed on the mounting portion 6b of the steel column 6a of the lower mat unit 6, that is, the seismic isolation device 2 The upper mat unit 5 is installed on the seismic isolation device 2 such that the upper mat unit 5 is sandwiched between the attachment portions 5b, 6b of the steel pillars 5a, 6a of the pair of upper and lower mat units 5, 6. Moreover, while installing the upper mat unit 5 in this way, the attachment part 5b of the upper mat unit 5 and the seismic isolation device 2 are connected. At this stage, the formwork for embedding the protruding steel columns 5a and 6a with concrete 9 and 10 is installed between the seismic isolation device 2 and the upper mat module 7 and between the seismic isolation device 2 and the lower mat module 8. Further, a formwork for forming the pillar 13 is attached on the upper mat module 7 of the upper mat portion 4.

  Next, since the mold frames 11 and 12 are attached in advance to the mat modules 7 and 8 of the upper and lower mat portions 3 and 4, respectively, the upper mat unit 5 is installed as shown in FIG. Concrete 9 and 10 are placed on the upper mat portion 4 and the lower mat portion 3 simultaneously or in the order of the upper mat portion 4 and the lower mat portion 3 (concrete placing step).

  Then, after the concrete 9 and 10 thus placed are hardened, the molds 11 and 12 are removed, thereby completing the construction of the upper and lower mat parts 3 and 4 (base isolation base 1). Construction of the seismic isolation building is completed by building the body.

  Therefore, in the construction method of the seismic isolation building of the present embodiment, at least the reinforcing bars and the molds 11 and 12 are combined in advance and prefabricated to produce the mat units 5 and 6 of the mat portions 3 and 4, and the concrete 9 and 10 is placed on the upper mat portion 4 and the lower mat portion 3 simultaneously or in the order of the upper mat portion 4 and the lower mat portion 3, so that the mat portions 3, 4 are moved up and down across the seismic isolation device 2. Can be constructed, and the period of reinforcement arrangement and concrete placement can be greatly shortened.

  Therefore, according to the construction method of the seismic isolation building of the present embodiment, it is possible to construct the seismic isolation building more efficiently than the conventional construction method of the seismic isolation building, shortening the construction period and reducing the construction cost. It becomes possible to plan.

  As mentioned above, although one Embodiment of the construction method of the seismic isolation building which concerns on this invention was described, this invention is not limited to said one Embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in this embodiment, the seismic isolation device 2 is installed after the lower mat unit 6 of the lower mat portion 3 is installed, but the seismic isolation device 2 may be attached to the lower mat unit 6 in advance. .

DESCRIPTION OF SYMBOLS 1 Seismic isolation base 2 Seismic isolation apparatus 3 Lower mat part 4 Upper mat part 5 Upper mat unit 5a Steel pillar 5b Mounting part 6 Lower mat unit 6a Steel pillar 6b Mounting part 7 Upper mat module 8 Lower mat module 9 Concrete 10 Concrete 11 Formwork 12 Formwork 13 Pillar

Claims (1)

A method of constructing a seismic isolation building having a seismic isolation base with a mat portion on top and bottom across a seismic isolation device,
The mat portion includes at least a mat unit that is prefabricated by integrally combining a reinforcing bar and a formwork, and concrete that is placed so as to bury the mat unit.
A lower mat unit installation step of installing the lower mat unit of the lower mat portion at a predetermined position;
A seismic isolation device installation step of installing the seismic isolation device on the lower mat unit;
An upper mat unit installation step of installing an upper mat unit of the upper mat portion at a predetermined position on the seismic isolation device;
A seismic isolation building comprising a concrete placing step for placing concrete simultaneously on the upper mat portion and the lower mat portion, or in the order of the upper mat portion and the lower mat portion. How to build.

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