JP2018115473A - Method of constructing seismic isolation structure and base isolation structure - Google Patents

Method of constructing seismic isolation structure and base isolation structure Download PDF

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JP2018115473A
JP2018115473A JP2017006936A JP2017006936A JP2018115473A JP 2018115473 A JP2018115473 A JP 2018115473A JP 2017006936 A JP2017006936 A JP 2017006936A JP 2017006936 A JP2017006936 A JP 2017006936A JP 2018115473 A JP2018115473 A JP 2018115473A
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base member
column base
concrete
foundation
seismic isolation
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JP6953723B2 (en
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直人 藤生
Naoto Fujio
直人 藤生
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Obayashi Corp
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Obayashi Corp
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Abstract

PROBLEM TO BE SOLVED: To make it possible to shorten the construction period of the building framework above the seismic isolation structure.SOLUTION: Method of constructing seismic isolation structure comprises a step of installing the seismic isolation bearing 20 on the lower foundation 11 on the ground, a step of placing the precast concrete bottom plate 30 on the seismic isolation bearing 20 and erecting the precast concrete column base member 40 on the bottom plate 30, and a step of embedding the column base member 40 in the concrete by casting concrete around the column base member 40 and the bottom plate 30.SELECTED DRAWING: Figure 10

Description

本発明は、免震構造物の施工方法に関する。   The present invention relates to a construction method for a seismic isolation structure.

特許文献１には、免震構造物が開示されている。具体的には、地盤上に底盤が設けられ、底盤には凸部が杭の直上の位置に形成され、その凸部上に免震ゴムが設置されている。建物躯体の底部には基礎梁が縦横に設けられており、免震ゴムが基礎梁の交差部の下には免震ゴムが設置され、基礎梁の交差部の上には躯体の柱が構築されている。   Patent Document 1 discloses a seismic isolation structure. Specifically, a bottom plate is provided on the ground, and a convex portion is formed on the bottom plate at a position directly above the pile, and a seismic isolation rubber is installed on the convex portion. Base beams are installed vertically and horizontally at the bottom of the building frame. Seismic isolation rubber is installed under the intersection of the foundation beams, and a column of the frame is built above the intersection of the foundation beams. Has been.

特開平９−２７３１６２号公報JP-A-9-273162

特許文献１の免震構造物の施工にあたっては、まず地盤上に底盤を構築した後、底盤の凸部上に免震ゴムを設置する。次に、基礎梁を縦横に構築した後、基礎梁の交差部の上に柱を構築する。従って、基礎梁の交差部のコンクリートが硬化しないと、建物躯体の柱を構築することができない。そのため、躯体建物の構築が遅れてしまう。
本発明は、上記事情に鑑みてなされたものであって、免震構造物の上側の建物躯体の工期を短縮できるようにすることを目的とする。 In the construction of the seismic isolation structure of Patent Document 1, first, the base is constructed on the ground, and then the base isolation rubber is installed on the convex portion of the base. Next, after the foundation beam is constructed vertically and horizontally, a column is constructed on the intersection of the foundation beams. Therefore, if the concrete at the intersection of the foundation beams is not hardened, the pillar of the building frame cannot be constructed. Therefore, the construction of the building will be delayed.
This invention is made | formed in view of the said situation, Comprising: It aims at enabling it to shorten the construction period of the building frame above a seismic isolation structure.

上記課題を解決するための本発明の一態様は、地盤上の下部基礎上に免震支承を設置する工程と、プレキャストコンクリート製の底版を前記免震支承上に設置して、プレキャストコンクリート製の柱脚部材を前記底版上に立設する工程と、前記柱脚部材の周囲且つ前記底版の上にコンクリートを打設することによって前記柱脚部材を前記コンクリートに埋設する工程と、を備えることを特徴とする免震構造物の施工方法である。
好ましくは、前記柱脚部材の立設後に前記柱脚部材の上に柱を構築する。
また、本発明の一態様は、地盤上に設置された下部基礎と、前記下部基礎上に設置された免震支承と、前記免震支承上に設置され、プレキャストコンクリートからなる底版と、前記底版上に立設され、プレキャストコンクリートからなる柱脚部材と、前記柱脚部材の周囲且つ前記底版の上に設置された鉄筋コンクリート造の上部基礎と、を備え、前記柱脚部材が前記上部基礎のコンクリートに埋設されていることを特徴とする免震構造物である。 One aspect of the present invention for solving the above problems is a step of installing a seismic isolation bearing on the lower foundation on the ground, and a precast concrete bottom slab is installed on the seismic isolation bearing, A step of standing a column base member on the bottom plate, and a step of embedding the column base member in the concrete by placing concrete around the column base member and on the bottom plate. This is a construction method of the seismic isolation structure.
Preferably, a column is constructed on the column base member after the column base member is erected.
Also, one aspect of the present invention includes a lower foundation installed on the ground, a seismic isolation bearing installed on the lower foundation, a bottom slab made of precast concrete installed on the seismic isolation bearing, and the bottom slab A column base member standing on the top and made of precast concrete, and a reinforced concrete upper foundation installed around the column base member and on the bottom plate, the column base member being a concrete of the upper foundation It is a seismic isolation structure characterized by being embedded in

以上によれば、プレキャスト製の柱脚部材を底盤上に立設したので、底盤の上にコンクリートを打設する前でも、またそのコンクリートの硬化前でも、建物躯体の柱を柱脚部材の上に構築することができる。よって、建物躯体を短期に構築することができる。   According to the above, since the precast column base member was erected on the bottom plate, the pillar of the building frame was placed on the column base member before placing concrete on the bottom plate and before hardening the concrete. Can be built. Therefore, the building frame can be constructed in a short time.

好ましくは、前記柱脚部材の立設後であって前記コンクリートの打設前に、プレキャスト製の梁部材を前記柱脚部材の側方に配置するとともに、前記梁部材と前記柱脚部材を鉄筋により連結する。   Preferably, after the column base member is erected and before the concrete is placed, a precast beam member is disposed on the side of the column base member, and the beam member and the column base member are reinforced. Connect with

以上によれば、基礎梁を施工することができる。   According to the above, a foundation beam can be constructed.

本発明によれば、建物躯体を短期に構築することができる。   According to the present invention, a building frame can be constructed in a short time.

免震構造物の斜視図である。It is a perspective view of a seismic isolation structure. 免震構造物の鉛直断面図である。It is a vertical sectional view of a seismic isolation structure. 免震構造物の施工工程を説明するための鉛直断面図である。It is a vertical sectional view for explaining a construction process of a seismic isolation structure. 図３に示す後の工程を説明するための鉛直断面図である。FIG. 4 is a vertical cross-sectional view for explaining a subsequent step shown in FIG. 3. 図３に示す後の工程を説明するための斜視図である。FIG. 4 is a perspective view for explaining a subsequent step shown in FIG. 3. 図４に示す後の工程を説明するための鉛直断面図である。FIG. 5 is a vertical cross-sectional view for explaining a subsequent step shown in FIG. 4. 図４に示す後の工程を説明するための斜視図である。FIG. 5 is a perspective view for explaining a subsequent step shown in FIG. 4. 図６に示す後の工程を説明するための鉛直断面図である。FIG. 7 is a vertical sectional view for explaining a subsequent step shown in FIG. 6. 図６に示す後の工程を説明するための斜視図である。FIG. 7 is a perspective view for explaining a subsequent step shown in FIG. 6. 図８に示す後の工程を説明するための鉛直断面図である。FIG. 9 is a vertical cross-sectional view for explaining a subsequent step shown in FIG. 8. 図８に示す後の工程を説明するための斜視図である。FIG. 9 is a perspective view for explaining a subsequent step shown in FIG. 8. 図１０に示す後の工程を説明するための鉛直断面図である。FIG. 11 is a vertical sectional view for explaining a subsequent step shown in FIG. 10. 図１０に示す後の工程を説明するための斜視図である。FIG. 11 is a perspective view for explaining a subsequent step shown in FIG. 10. 図１２に示す後の工程を説明するための鉛直断面図である。FIG. 13 is a vertical cross-sectional view for explaining a subsequent step shown in FIG. 12. 図１２に示す後の工程を説明するための斜視図である。FIG. 13 is a perspective view for explaining a subsequent step shown in FIG. 12. 図１４に示す後の工程を説明するための斜視図である。FIG. 15 is a perspective view for explaining a subsequent step shown in FIG. 14. 図１６に示す後の工程を説明するための鉛直断面図である。FIG. 17 is a vertical sectional view for explaining a subsequent step shown in FIG. 16. 柱脚部材に柱部材を接合する工程を説明するための斜視図である。It is a perspective view for demonstrating the process of joining a column member to a column base member.

以下、図面を参照して、本発明の実施形態について説明する。但し、以下に述べる実施形態には、本発明を実施するために技術的に好ましい種々の限定が付されているが、本発明の範囲を以下の実施形態及び図示例に限定するものではない。   Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

１． 免震構造物
図１は免震構造物の斜視図であり、図２は免震構造物の鉛直断面図である。 1. FIG. 1 is a perspective view of the base isolation structure, and FIG. 2 is a vertical sectional view of the base isolation structure.

鉄筋コンクリート造の耐圧盤１０が地盤上に構築されている。耐圧盤１０は地盤に打ち込まれた杭の頭部に接合されている。耐圧盤１０上には、鉄筋コンクリート造の下部基礎１１が凸状に設置されている。   A reinforced concrete pressure board 10 is constructed on the ground. The pressure platen 10 is joined to the head of a pile driven into the ground. On the pressure platen 10, a reinforced concrete lower foundation 11 is provided in a convex shape.

下部基礎１１上には免震支承２０が設置されている。具体的には、下部基礎１１の上面にプレート１２が埋設されることによって下部基礎１１とプレート１２が一体化されており、免震支承２０の下側フランジ２１がボルト等によってプレート１２に締結されている。
免震支承２０は、上下一対の対向フランジ２１，２２の間にゴム層と鋼板が交互に積層されたものである。免震支承２０は、水平方向の振動について、それよりも下側の耐圧盤１０とそれよりも上側の建物の躯体とを絶縁するものである。 A seismic isolation bearing 20 is installed on the lower foundation 11. Specifically, the lower foundation 11 and the plate 12 are integrated by embedding the plate 12 on the upper surface of the lower foundation 11, and the lower flange 21 of the seismic isolation bearing 20 is fastened to the plate 12 with bolts or the like. ing.
The seismic isolation bearing 20 is formed by alternately laminating rubber layers and steel plates between a pair of upper and lower opposed flanges 21 and 22. The seismic isolation bearing 20 insulates the pressure platen 10 on the lower side from the frame of the building on the upper side with respect to horizontal vibration.

免震支承２０上には、プレキャストコンリート製（以下、「プレキャストコンクリート」を「ＰＣ」と略記する。）の底版３０が設置されている。具体的には、底版３０の下面にプレート３１が埋設されることによって底版３０とプレート３１が一体化されており、免震支承２０の上側フランジ２２がボルト等によってプレート３１に締結されている。   A base plate 30 made of precast concrete (hereinafter “precast concrete” is abbreviated as “PC”) is installed on the seismic isolation bearing 20. Specifically, the bottom plate 30 and the plate 31 are integrated by embedding the plate 31 in the lower surface of the bottom plate 30, and the upper flange 22 of the seismic isolation bearing 20 is fastened to the plate 31 with bolts or the like.

底版３０上には鉄筋コンリート造の上部基礎３５が形成されており、上部基礎３５のコンクリートと底版３０が一体化されている。ここで、底版３０の鉄筋３２が底版３０の上面から上方に突出するように配筋されており、それら鉄筋３２が上部基礎３５のコンクリートに埋設されている。   An upper foundation 35 made of reinforced concrete is formed on the bottom plate 30, and the concrete of the upper foundation 35 and the bottom plate 30 are integrated. Here, the reinforcing bars 32 of the bottom plate 30 are arranged so as to protrude upward from the upper surface of the bottom plate 30, and the reinforcing bars 32 are embedded in the concrete of the upper foundation 35.

底版３０の中央部上にはＰＣ製の柱脚部材４０が立設されており、柱脚部材４０の下端面と底版３０の上面との間にグラウト４１が充填されている。柱脚部材４０と底版３０の一体性を高めるために、柱脚部材４０の下端面から突出した主筋が底版３０に定着されてもよいし、底版３０の上面から突出した鉄筋が柱脚部材４０の下端に埋設されたスリーブ継手に接合されてもよい。なお、グラウトが設けられずに、柱脚部材４０の下端面が底版３０に直接突き当てられてもよい。   A PC column base member 40 is erected on the center of the bottom plate 30, and a grout 41 is filled between the lower end surface of the column base member 40 and the upper surface of the bottom plate 30. In order to improve the integrity of the column base member 40 and the bottom plate 30, the main bars protruding from the lower end surface of the column base member 40 may be fixed to the bottom plate 30, or the reinforcing bars protruding from the top surface of the bottom plate 30 are column base members 40. It may be joined to a sleeve joint embedded in the lower end of the sleeve. In addition, the lower end surface of the column base member 40 may be directly abutted against the bottom plate 30 without providing the grout.

柱脚部材４０の下部が上部基礎３５のコンクリートに埋設されており、柱脚部材４０の上部が上部基礎３５の上面から突出している。柱脚部材４０のうち上部基礎３５の上面から突出した部分は、建物の躯体の柱の一部である。なお、柱脚部材４０の全体が上部基礎３５のコンクリートに埋設されて、柱脚部材４０の上端面と上部基礎３５の上面が揃っていてもよい。
柱脚部材４０と上部基礎３５のコンクリートの付着性を高めるため、柱脚部材４０の側面が目荒し加工等によって凸凹に形成されている。 The lower part of the column base member 40 is embedded in the concrete of the upper foundation 35, and the upper part of the column base member 40 protrudes from the upper surface of the upper foundation 35. The portion of the column base member 40 that protrudes from the upper surface of the upper foundation 35 is a part of the column of the building frame. The entire column base member 40 may be embedded in the concrete of the upper foundation 35 so that the upper end surface of the column base member 40 and the upper surface of the upper foundation 35 are aligned.
In order to enhance the adhesion between the column base member 40 and the concrete of the upper foundation 35, the side surface of the column base member 40 is formed to be uneven by roughening or the like.

柱脚部材４０の上端には、建物の躯体の柱となるＰＣ製の柱部材５０が接合されている。ここで、柱脚部材４０の主筋４２が柱脚部材４０の上端面から突出しており、柱部材５０の主筋５２に接続されたスリーブ継手が柱部材５０の下端部に埋設されており、柱脚部材４０の主筋４２がスリーブ継手に接合されている。また、柱脚部材４０の上端面と柱部材５０の下端面との間にはグラウト５１が充填されている。   At the upper end of the column base member 40, a PC column member 50 which is a column of a building frame is joined. Here, the main reinforcement 42 of the column base member 40 protrudes from the upper end surface of the column base member 40, and the sleeve joint connected to the main reinforcement 52 of the column member 50 is embedded in the lower end portion of the column member 50, The main bar 42 of the member 40 is joined to the sleeve joint. Further, a grout 51 is filled between the upper end surface of the column base member 40 and the lower end surface of the column member 50.

上部基礎３５の側部には基礎梁６０が設置されており、この基礎梁６０が上部基礎３５から隣りの上部基礎まで架設されている。基礎梁６０はハーフＰＣ製である。つまり、基礎梁６０の下部６１がＰＣ製であり、基礎梁６０の上部６２が現場打ち鉄筋コンクリート造である。ここで、基礎梁６０の上部６２のコンクリートは上部基礎３５のコンクリートと一体打ちされたものである。   A foundation beam 60 is installed on the side of the upper foundation 35, and the foundation beam 60 is constructed from the upper foundation 35 to the adjacent upper foundation. The foundation beam 60 is made of half PC. That is, the lower part 61 of the foundation beam 60 is made of PC, and the upper part 62 of the foundation beam 60 is made of cast-in-place reinforced concrete. Here, the concrete of the upper part 62 of the foundation beam 60 is integrally formed with the concrete of the upper foundation 35.

基礎梁６０の主筋６５は柱脚部材４０に定着されている。具体的には、基礎梁６０の主筋６５の一部が上部基礎３５まで至って柱脚部材４０を貫通しており、主筋６５のうち上部基礎３５のコンクリートに埋設された部分がそのコンクリートに付着し、柱脚部材４０のコンクリートに埋設された部分が柱脚部材４０のコンクリートに付着している。ここで、基礎梁６０の主筋６５は、柱脚部材４０と一体化された連結鉄筋６５ａと、連結鉄筋６５ａの端部に機械式継手６５ｂによって連結された鉄筋６５ｃと、から構成されている。連結鉄筋６５ａの中央部が柱脚部材４０のコンクリートに埋設されており、柱脚部材４０の側面から突き出た部分が上部基礎３５のコンクリートに埋設されている。鉄筋６５ｃの中央部が基礎梁６０のコンクリートに埋設されており、鉄筋６５ｃの端部が上部基礎３５のコンクリートに埋設されている。機械式継手６５ｂは例えばねじ節鉄筋継手、端部ねじ加工継手若しくはモルタル充填式継手又はこれらの方式の併用継手である。機械式継手６５ｂを他の継手（例えば、ガス圧接継手、溶接継手）に変更してもよい。   The main bar 65 of the foundation beam 60 is fixed to the column base member 40. Specifically, a part of the main reinforcement 65 of the foundation beam 60 reaches the upper foundation 35 and penetrates the column base member 40, and a portion of the main reinforcement 65 embedded in the concrete of the upper foundation 35 adheres to the concrete. The portion of the column base member 40 embedded in the concrete adheres to the concrete of the column base member 40. Here, the main reinforcing bar 65 of the foundation beam 60 includes a connecting reinforcing bar 65a integrated with the column base member 40, and a reinforcing bar 65c connected to an end of the connecting reinforcing bar 65a by a mechanical joint 65b. A central portion of the connecting reinforcing bar 65 a is embedded in the concrete of the column base member 40, and a portion protruding from the side surface of the column base member 40 is embedded in the concrete of the upper foundation 35. The central portion of the reinforcing bar 65 c is embedded in the concrete of the foundation beam 60, and the end portion of the reinforcing bar 65 c is embedded in the concrete of the upper foundation 35. The mechanical joint 65b is, for example, a threaded bar joint, an end thread joint, a mortar filling joint, or a combination joint of these systems. The mechanical joint 65b may be changed to another joint (for example, a gas pressure joint or a weld joint).

基礎梁６０と上部基礎３５によって囲われた領域にはスラブ（図示略）が設けられている。スラブはハーフＰＣ製であり、スラブの下部がＰＣ製であり、スラブの上部が現場打ち鉄筋コンクリート造である。   A slab (not shown) is provided in a region surrounded by the foundation beam 60 and the upper foundation 35. The slab is made of half PC, the lower part of the slab is made of PC, and the upper part of the slab is made of cast-in-place reinforced concrete.

２． 免震構造物の施工方法
まず、図３に示すように耐圧盤１０用の鉄筋及び下部基礎１１用の鉄筋１１ｂを配筋し、更に型枠を設置した上で、耐圧盤１０のコンクリートを打設する。
次に、図４及び図５に示すように、下部基礎１１のコンクリートを打設するとともに、下部基礎１１の上面にプレート１２に設置する。
次に、図６及び図７に示すように、下部基礎１１上に免震支承２０を設置する。具体的には、免震支承２０をプレート１２上に配置して、免震支承２０の下側フランジ２１をボルト等によってプレート１２に締結する。 2. 3. Construction method of seismic isolation structure First, as shown in FIG. 3, a reinforcing bar for the pressure-resistant panel 10 and a reinforcing bar 11b for the lower foundation 11 are arranged, and after the formwork is installed, the concrete of the pressure-resistant panel 10 is placed. Set up.
Next, as shown in FIGS. 4 and 5, the concrete of the lower foundation 11 is placed, and the plate 12 is installed on the upper surface of the lower foundation 11.
Next, as shown in FIGS. 6 and 7, the seismic isolation bearing 20 is installed on the lower foundation 11. Specifically, the seismic isolation bearing 20 is disposed on the plate 12, and the lower flange 21 of the seismic isolation bearing 20 is fastened to the plate 12 with bolts or the like.

次に、図８及び図９に示すように、免震支承２０の上側フランジ２２よりも面積の大きい底版３０を免震支承２０上に設置する。具体的には、ＰＣ製の底版３０を免震支承２０の上側フランジ２２上に配置して、その底版３０を支持台によって支持した後、底版３０の下面に設けられたプレート３１をボルト等によって上側フランジ２２に締結する。ここで、底版３０のコンクリートに埋設された鉄筋３２の一部が底版３０の上面から突出している。   Next, as shown in FIGS. 8 and 9, the bottom slab 30 having a larger area than the upper flange 22 of the seismic isolation bearing 20 is installed on the seismic isolation bearing 20. Specifically, after placing the bottom plate 30 made of PC on the upper flange 22 of the seismic isolation bearing 20 and supporting the bottom plate 30 with a support base, the plate 31 provided on the lower surface of the bottom plate 30 is bolted or the like. Fasten to upper flange 22. Here, a part of the reinforcing bar 32 embedded in the concrete of the bottom plate 30 protrudes from the upper surface of the bottom plate 30.

次に、図１０及び図１１に示すように、クレーン等によってＰＣ製の柱脚部材４０を立てた状態で底版３０の中央部上に設置して、柱脚部材４０の下端面と底版３０との間にグラウト４１を充填する。ここで、柱脚部材４０の設置に際しては、柱脚部材４０の主筋４２が柱脚部材４０の下端面から突出している場合には、柱脚部材４０の主筋４２を底版３０に定着する。また、底版３０の鉄筋が底版３０の中央部の上面から突出している場合には、底版３０の鉄筋を柱脚部材４０の下端のスリーブ継手に接合する。
免震支承２０の上側フランジ２２よりも面積の大きい底版３０が支持台によって支持されているので、底版３０が安定して、柱脚部材４０の設置作業を容易に行える。 Next, as shown in FIG. 10 and FIG. 11, the column base member 40 made of PC is set up by a crane or the like on the center part of the bottom plate 30, and the lower end surface of the column base member 40, the bottom plate 30, The grout 41 is filled in between. Here, when the column base member 40 is installed, if the main bar 42 of the column base member 40 protrudes from the lower end surface of the column base member 40, the main bar 42 of the column base member 40 is fixed to the bottom plate 30. When the reinforcing bar of the bottom plate 30 protrudes from the upper surface of the center portion of the bottom plate 30, the reinforcing bar of the bottom plate 30 is joined to the sleeve joint at the lower end of the column base member 40.
Since the bottom plate 30 having a larger area than the upper flange 22 of the seismic isolation bearing 20 is supported by the support base, the bottom plate 30 is stable and the column base member 40 can be easily installed.

柱脚部材４０には連結鉄筋６５ａが予め設けられている。連結鉄筋６５ａが水平に延在していて、連結鉄筋６５ａの中央部が柱脚部材４０のコンクリートに埋設され、連結鉄筋６５ａの端部が柱脚部材４０の側面から突き出ており、連結鉄筋６５ａの端部に機械式継手６５ｂが取り付けられている。
なお、柱脚部材４０の設置前又は設置後に、柱脚部材４０の側面をウォータージェット法等により粗面化する。 The column base member 40 is provided with a connecting reinforcing bar 65a in advance. The connecting reinforcing bar 65a extends horizontally, the center of the connecting reinforcing bar 65a is embedded in the concrete of the column base member 40, the end of the connecting reinforcing bar 65a protrudes from the side surface of the column base member 40, and the connecting reinforcing bar 65a. A mechanical joint 65b is attached to the end of the.
Before or after the column base member 40 is installed, the side surface of the column base member 40 is roughened by a water jet method or the like.

グラウト４１の硬化後は、柱脚部材４０の上端にＰＣ製の柱部材５０の下端を接合して、柱脚部材４０を柱部材５０に組み付けることができる。柱部材５０の組み付け後も、柱部材５０の上に複数のＰＣ製の柱部材を順次積み上げるよう、これら柱部材を組み付けて、建物の躯体の柱を構築することができる。柱の構築の際に上部基礎３５が施工されていなくても、柱脚部材４０や建物の躯体の柱が安定する。これは、柱脚部材４０がＰＣ製であるので、建物の躯体の柱が柱脚部材４０に安定して支持されるためである。
柱の構築は、後述の上部基礎３５及び基礎梁６０の施工と並行して行うことができる。よって、建物躯体を短期間に施工できる。 After the grout 41 is cured, the column base member 40 can be assembled to the column member 50 by joining the bottom end of the column member 50 made of PC to the top end of the column base member 40. Even after the column member 50 is assembled, it is possible to construct a column of a building frame by assembling these column members so that a plurality of PC column members are sequentially stacked on the column member 50. Even when the upper foundation 35 is not constructed during the construction of the pillar, the pillar base member 40 and the pillar of the building frame are stabilized. This is because the column base member 40 is made of PC, so that the column of the building frame is stably supported by the column base member 40.
The construction of the pillar can be performed in parallel with the construction of the upper foundation 35 and the foundation beam 60 described later. Therefore, the building frame can be constructed in a short time.

柱脚部材４０の設置後、図１２及び図１３に示すように、完成後の基礎梁６０の下部６１に相当するＰＣ製の梁部材６１Ａを柱脚部材４０の側方に配置して、梁部材６１Ａを支持台によって支持する。そして、梁部材６１Ａの端面から突き出た鉄筋６５ｃの端部を機械式継手６５ｂによって連結鉄筋６５ａの端部に連結する。
また、基礎梁６０の上部６２の主筋６５の一部である鉄筋６５ｃを梁部材６１Ａの上に配筋して、鉄筋６５ｃの端部を機械式継手６５ｂによって連結鉄筋６５ａの端部に連結する。 After installing the column base member 40, as shown in FIGS. 12 and 13, a PC beam member 61A corresponding to the lower portion 61 of the completed foundation beam 60 is arranged on the side of the column base member 40, and the beam The member 61A is supported by a support base. Then, the end of the reinforcing bar 65c protruding from the end surface of the beam member 61A is connected to the end of the connecting reinforcing bar 65a by the mechanical joint 65b.
Further, a reinforcing bar 65c which is a part of the main reinforcing bar 65 of the upper part 62 of the foundation beam 60 is arranged on the beam member 61A, and the end of the reinforcing bar 65c is connected to the end of the connecting reinforcing bar 65a by the mechanical joint 65b. .

次に、図１４及び図１５に示すように、上部基礎３５用の鉄筋３６を配筋する。次に、上部基礎３５用の型枠を底版３０の側面に沿わせて柱脚部材４０の周囲に設置して、柱脚部材４０を型枠によって囲繞する。ここで、梁部材６１Ａの端面の位置には型枠の開口があり、梁部材６１Ａの端面がその開口を通じて型枠の内側で露出している。   Next, as shown in FIGS. 14 and 15, reinforcing bars 36 for the upper foundation 35 are arranged. Next, the formwork for the upper foundation 35 is installed around the column base member 40 along the side surface of the bottom plate 30, and the column base member 40 is surrounded by the formwork. Here, there is an opening of the formwork at the position of the end face of the beam member 61A, and the end face of the beam member 61A is exposed inside the formwork through the opening.

次に、図１６に示すように、ＰＣ製の床版７０を梁部材６１Ａによって囲われた領域に敷設する。ここで、床版７０のコンクリートに一部埋め込まれたトラス筋が床版７０のコンクリートの上面から突出している。なお、図１６を見やすくするために、トラス筋の図示を省略する。   Next, as shown in FIG. 16, a PC floor slab 70 is laid in an area surrounded by the beam member 61A. Here, truss bars partially embedded in the concrete of the floor slab 70 protrude from the upper surface of the concrete of the floor slab 70. In addition, in order to make FIG. 16 easy to see, illustration of truss bars is omitted.

次に、図１７に示すように、底版３０の上にコンクリートを打設して、そのコンクリートに柱脚部材４０の下部を埋設する。底版３０上のコンクリートが硬化すると、上部基礎３５が完成する。
また、底版３０の上のコンクリートの打設と並行して、梁部材６１Ａの上及び床版７０の上にもコンクリートを打設する。梁部材６１Ａの上のコンクリートが硬化すると、基礎梁６０が完成し、底版３０の上のコンクリートが硬化すると、スラブが完成する。よって、上部基礎３５のコンクリート、基礎梁６０の上部６２のコンクリート、スラブの上部のコンクリートは一体成形されたものとなる。 Next, as shown in FIG. 17, concrete is placed on the bottom plate 30, and the lower part of the column base member 40 is embedded in the concrete. When the concrete on the bottom plate 30 is cured, the upper foundation 35 is completed.
In parallel with the placement of the concrete on the bottom plate 30, the concrete is also placed on the beam member 61 </ b> A and the floor slab 70. When the concrete on the beam member 61A is cured, the foundation beam 60 is completed, and when the concrete on the bottom plate 30 is cured, the slab is completed. Therefore, the concrete of the upper foundation 35, the concrete of the upper part 62 of the foundation beam 60, and the concrete of the upper part of the slab are integrally formed.

上述したように、上部基礎３５、基礎梁６０及びスラブの施工作業と並行して、建物の躯体の柱を柱脚部材４０の上に構築する。例えば、図１８に示すように、床版７０の設置作業後に柱脚部材４０の上端にＰＣ製の柱部材５０の下端を接合し、その後、柱部材５０の上に柱部材を順次組み上げていくが、柱の構築と並行して底版３０、梁部材６１Ａ及び床版７０のコンクリートを打設する。
なお、上部基礎３５、基礎梁６０及びスラブの施工後に建物の躯体の柱を柱脚部材４０の上に構築してもよい。 As described above, in parallel with the construction work of the upper foundation 35, the foundation beam 60, and the slab, the column of the building frame is constructed on the column base member 40. For example, as shown in FIG. 18, after installing the floor slab 70, the lower end of the PC column member 50 is joined to the upper end of the column base member 40, and then the column members are sequentially assembled on the column member 50. However, the concrete of the bottom slab 30, the beam member 61A and the floor slab 70 is placed in parallel with the construction of the pillar.
In addition, you may build the column of the frame of a building on the column base member 40 after construction of the upper foundation 35, the foundation beam 60, and a slab.

３． 効果
（１） ＰＣ製の柱脚部材４０を底版３０上に立設したので、上部基礎３５のコンクリートの打設前でも、建物躯体の柱を柱脚部材４０上に構築することができる。また、柱脚部材４０の立設後に、上部基礎３５及び基礎梁６０の施工と柱の構築を並行して行うことによって、建物の躯体を短期間に構築することができる。 3. Effect (1) Since the column base member 40 made of PC is erected on the bottom plate 30, the column of the building frame can be constructed on the column base member 40 even before the concrete of the upper foundation 35 is placed. Moreover, after the column base member 40 is erected, the building frame can be constructed in a short time by performing the construction of the upper foundation 35 and the foundation beam 60 and the construction of the column in parallel.

（２） 底版３０及び柱脚部材４０がＰＣ製であるので、建物躯体の柱の脚部となるフーチング（柱脚部材４０の下部、底版３０及び上部基礎３５からなる）が高品質である。 (2) Since the bottom plate 30 and the column base member 40 are made of PC, the footing (consisting of the lower portion of the column base member 40, the bottom plate 30 and the upper foundation 35) serving as the leg portion of the column of the building frame is of high quality.

（３） 柱脚部材４０は、建物躯体の柱の脚部となるフーチング（柱脚部材４０の下部、底版３０及び上部基礎３５からなる）よりも小型且つ軽量である。そのため、柱脚部材４０を貨物自動車によって工場から現場に運搬することができる。底版３０についても同様である。 (3) The column base member 40 is smaller and lighter than the footing (consisting of the lower part of the column base member 40, the bottom plate 30 and the upper foundation 35) which is the leg part of the column of the building frame. Therefore, the column base member 40 can be transported from the factory to the site by a truck. The same applies to the bottom plate 30.

（４） 柱脚部材４０がＰＣ製であり、基礎梁６０の主筋６５の一部である連結鉄筋６５ａが予め柱脚部材４０を貫通するように設けられている。そのため、基礎梁６０の主筋６５と柱脚部材４０のコンクリートとの定着の品質が高い。 (4) The column base member 40 is made of PC, and a connecting reinforcing bar 65 a that is a part of the main bar 65 of the foundation beam 60 is provided so as to penetrate the column base member 40 in advance. Therefore, the quality of fixation between the main bar 65 of the foundation beam 60 and the concrete of the column base member 40 is high.

４． 変形例
（１） 上述の実施形態では、基礎梁６０がハーフＰＣ製である。それに対して、基礎梁６０の全体がＰＣ製であってもよい。この場合、柱脚部材４０の設置後にＰＣ製の梁部材６１Ａを設置した場合と同様に、ＰＣ製の梁部材（この梁部材は完成後の基礎梁６０に相当する）を柱脚部材４０の側方に配置して、梁部材を支持台によって支持する。そして、梁部材の端面から突き出た鉄筋の端部を機械式継手６５ｂによって連結鉄筋６５ａの端部に連結する。その後、梁部材の上に鉄筋を配筋することなく、上記実施形態の場合と同様に、上部基礎３５用の鉄筋及び型枠を設置した後、ＰＣ製の床版７０を設置する。その後、底版３０の上及び床版７０の上にコンクリートを打設する。
なお、基礎梁６０の全体がＰＣ製である場合、スラブの全体もＰＣ製であってもよい。この場合、床版７０が上述の実施形態よりも厚く、床版７０の鉄筋は床版７０の上面から突出していない。また、床版７０の上にコンクリートを打設しない。 4). Modification (1) In the above-described embodiment, the foundation beam 60 is made of half PC. On the other hand, the whole foundation beam 60 may be made of PC. In this case, similarly to the case where the PC beam member 61A is installed after the column base member 40 is installed, the PC beam member (this beam member corresponds to the foundation beam 60 after completion) of the column base member 40 is used. It arrange | positions to a side and a beam member is supported by a support stand. Then, the end of the reinforcing bar protruding from the end face of the beam member is connected to the end of the connecting reinforcing bar 65a by the mechanical joint 65b. Then, without arranging reinforcing bars on the beam members, the reinforcing bars and the formwork for the upper foundation 35 are installed, and then the floor slab 70 made of PC is installed, as in the case of the above embodiment. Thereafter, concrete is placed on the bottom plate 30 and the floor plate 70.
In addition, when the whole foundation beam 60 is made of PC, the whole slab may be made of PC. In this case, the floor slab 70 is thicker than the above-described embodiment, and the reinforcing bars of the floor slab 70 do not protrude from the upper surface of the floor slab 70. Also, no concrete is placed on the floor slab 70.

（２） 上述の実施形態では、基礎梁６０及びスラブがハーフＰＣ製である。それに対して、基礎梁６０の全体及びスラブの全体が現場打ちの鉄筋コンクリート造であってもよい。この場合、柱脚部材４０の設置後に、ＰＣ製の梁部材を設置することなく、基礎梁６０の主筋及びせん断補強筋を配筋して、主筋の端部を機械式継手６５ｂによって連結鉄筋６５ａの端部に連結する。更に、上部基礎３５の鉄筋及びスラブの鉄筋も配筋する。その後、基礎梁６０用、上部基礎３５用及びスラブ用の型枠を設置した後、コンクリートを型枠内に打設する。 (2) In the above-described embodiment, the foundation beam 60 and the slab are made of half PC. On the other hand, the entire foundation beam 60 and the entire slab may be made of reinforced concrete on site. In this case, after installing the column base member 40, the main bar and the shear reinforcement bar of the foundation beam 60 are arranged without installing the beam member made of PC, and the end of the main bar is connected to the connecting bar 65a by the mechanical joint 65b. Connect to the end of Furthermore, the reinforcing bars of the upper foundation 35 and the reinforcing bars of the slab are also arranged. Then, after installing the formwork for the foundation beam 60, the upper foundation 35, and the slab, concrete is placed in the formwork.

（３） 上記実施形態では、別体の底版３０と柱脚部材４０を組み付ける。それに対して、底版３０と柱脚部材４０が一体化されたＰＣ製の部材を免震支承２０上に設置してもよい。 (3) In the above embodiment, the separate bottom plate 30 and the column base member 40 are assembled. On the other hand, a PC member in which the bottom plate 30 and the column base member 40 are integrated may be installed on the seismic isolation bearing 20.

（４） 連結鉄筋６５ａが柱脚部材４０の側面から突出しておらず、機械式継手６５ｂの全体又は一部が柱脚部材４０のコンクリートに埋設されるようにして、機械式継手６５ｂが柱脚部材４０の側面に設けられていてもよい。この場合、梁部材６１Ａの端面から突出した鉄筋６５ｃを機械式継手６５ｂにより連結鉄筋６５ａに連結する。 (4) The connecting joint 65b does not protrude from the side surface of the column base member 40, and the mechanical joint 65b is connected to the column base so that the whole or a part of the mechanical joint 65b is embedded in the concrete of the column base member 40. It may be provided on the side surface of the member 40. In this case, the reinforcing bar 65c protruding from the end face of the beam member 61A is connected to the connecting reinforcing bar 65a by the mechanical joint 65b.

（５） 鉄筋６５ｃが梁部材６１Ａの端面から突出していなくてもよい。この場合、柱脚部材４０の側面から突出した連結鉄筋６５ａを梁部材６１Ａの端面において機械式継手６５ｂにより梁部材６１Ａの鉄筋に連結する。 (5) The reinforcing bar 65c may not protrude from the end surface of the beam member 61A. In this case, the connecting reinforcing bar 65a protruding from the side surface of the column base member 40 is connected to the reinforcing bar of the beam member 61A by the mechanical joint 65b on the end surface of the beam member 61A.

（６） 連結鉄筋６５ａが柱脚部材４０に設けられていなくてもよい。この場合、柱脚部材４０の一方の側方に配置した梁部材６１Ａの端面から突出した鉄筋６５ｃを柱脚部材４０に貫通させ（その貫通孔にモルタル等の充填材を充填する）、柱脚部材４０の他方の側方に配置した梁部材６１Ａの鉄筋６５ｃ（この鉄筋６５ｃは梁部材６１Ａの端面から突出していてもよいし、突出していなくてもよい。）に継手により連結する。 (6) The connecting reinforcing bars 65a may not be provided on the column base member 40. In this case, the reinforcing bar 65c protruding from the end surface of the beam member 61A arranged on one side of the column base member 40 is penetrated through the column base member 40 (the through hole is filled with a filler such as mortar), and the column base The rebar 65c of the beam member 61A disposed on the other side of the member 40 is connected by a joint to the rebar 65c (this rebar 65c may or may not protrude from the end face of the beam member 61A).

（７） 梁部材６１Ａと柱脚部材４０を梁主筋６５により連結するのであれば、上述の実施形態や上記（４）〜（６）以外の方式を採用してもよい。 (7) As long as the beam member 61 </ b> A and the column base member 40 are connected by the beam main bar 65, methods other than the above-described embodiment and the above-described (4) to (6) may be adopted.

１０…耐圧盤， １１…下部基礎， ２０…免震支承， ３０…底版， ３５…上部基礎， ４０…柱脚部材， ５０…柱部材， ６０…基礎梁， ６１Ａ…梁部材， ６５…主筋， ６５ａ…連結鉄筋， ６５ｂ…機械式継手， ６５ｃ…鉄筋   DESCRIPTION OF SYMBOLS 10 ... Pressure-resistant board, 11 ... Lower foundation, 20 ... Seismic isolation bearing, 30 ... Bottom plate, 35 ... Upper foundation, 40 ... Column base member, 50 ... Column member, 60 ... Foundation beam, 61A ... Beam member, 65 ... Main reinforcement, 65a ... Connection rebar, 65b ... Mechanical joint, 65c ... Rebar

Claims (4)

地盤上の下部基礎上に免震支承を設置する工程と、
プレキャストコンクリート製の底版を前記免震支承上に設置して、プレキャストコンクリート製の柱脚部材を前記底版上に立設する工程と、
前記柱脚部材の周囲且つ前記底版の上にコンクリートを打設することによって前記柱脚部材を前記コンクリートに埋設する工程と、を備えることを特徴とする免震構造物の施工方法。 Installing a seismic isolation bearing on the lower foundation on the ground;
Installing a base plate made of precast concrete on the seismic isolation bearing, and standing a column base member made of precast concrete on the bottom plate;
And a step of embedding the column base member in the concrete by placing concrete on the periphery of the column base member and on the bottom slab. 前記柱脚部材の立設後に前記柱脚部材の上に柱を構築する工程を更に備えることを特徴とする請求項１に記載の免震構造物の施工方法。   The construction method of the seismic isolation structure according to claim 1, further comprising a step of constructing a column on the column base member after the column base member is erected. 前記柱脚部材の立設後であって前記コンクリートの打設前に、プレキャスト製の梁部材を前記柱脚部材の側方に配置するとともに、前記梁部材と前記柱脚部材を鉄筋により連結する工程を更に備えることを特徴とする請求項１又は２に記載の免震構造物の施工方法。   After the column base member is erected and before placing the concrete, a precast beam member is disposed on the side of the column base member, and the beam member and the column base member are connected by a reinforcing bar. The construction method for a seismic isolation structure according to claim 1, further comprising a step. 地盤上に設置された下部基礎と、
前記下部基礎上に設置された免震支承と、
前記免震支承上に設置され、プレキャストコンクリートからなる底版と、
前記底版上に立設され、プレキャストコンクリートからなる柱脚部材と、
前記柱脚部材の周囲且つ前記底版の上に設置された鉄筋コンクリート造の上部基礎と、を備え、
前記柱脚部材が前記上部基礎のコンクリートに埋設されていることを特徴とする免震構造物。 The lower foundation installed on the ground,
Seismic isolation bearings installed on the lower foundation;
A bottom plate made of precast concrete installed on the seismic isolation bearing;
A column base member standing on the bottom plate and made of precast concrete;
An upper foundation made of reinforced concrete installed around the column base member and on the bottom plate,
The seismic isolation structure, wherein the column base member is embedded in the concrete of the upper foundation.
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